JPH11179770A - Apparatus and method for controlling mold clamping of a compression molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture at low cost by supplying a working fluid of a predetermined pressure, cooperating a pressure control and a speed and position control of a plurality of mold clamping cylinders, and controlling so that a specific mold moves in parallel, thereby controlling parallel movement based on a stable mold clamping pressure. SOLUTION: A constant working fluid pressure source 80 supplies a working fluid (hydraulic oil) of a predetermined pressure to electromagnetic servo valves 61a to 61d to hold hydraulic pressures at inlets of the valves 61a to 61d. Here, the valves 61a to 61d supply, regulate supplies and further stops supplying the hydraulic pressures. And, they are controlled by a controller 75. Further, pressure control, speed and position control are cooperated with a plurality of mold clamping cylinders 11 based on a detected result from a position detecting means and a hydraulic pressure detecting means during compression molding of the molding by mold clamping. And, a servo valve mechanism 60 is controlled so as to move at least one mold of a pair of molds in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping control device and a mold suitable for an injection compression molding machine for injection compression molding of a molding material such as a plasticized plastic material. It relates to a tightening control method.

[0002]

2. Description of the Related Art In a conventional injection compression molding machine having a plurality of cylinders dedicated to mold clamping, a fixed amount of plasticized molten resin or the like (hereinafter referred to as molten resin) is injected between a fixed mold and a movable mold. The molten resin is molded as a molded product by clamping with a plurality of clamping cylinders. Considering the case where the injection compression molding machine is used to mold a molding material into a molded product having an asymmetrical shape, in this case, since the pressure distribution in the mold during compression of the mold becomes uneven, The load applied to the mold clamping cylinder becomes uneven, which causes a relative inclination between the fixed mold and the movable mold. There is a problem that the thickness becomes uneven.
Therefore, various methods for preventing such a relative inclination between the fixed mold and the movable mold have been proposed.

FIG. 8 shows a mold clamping control of a conventional injection compression molding machine disclosed in Japanese Patent Application Laid-Open No. 5-269750, in which a device for preventing the relative inclination between the dies as described above is devised. FIG. 9 is a diagram schematically illustrating a main part of the apparatus. As shown in FIG. 8, the mold clamping control device of the conventional injection compression molding machine includes a movable mold board 109 and a fixed mold board 105. , The fixed mold plate 105 is fixed on a bed (not shown),
Further, a fixed mold 103 is attached to the fixed mold plate 105. On the bed, a movable mold plate 109 with a movable mold 107 is provided so as to face the fixed mold plate 105,
It is slidably mounted on the bed.

In the vicinity of the outer periphery of the fixed mold plate 105,
For example, four mold clamping cylinders 65a to 65d are provided, and inside these mold clamping cylinders 65a to 65d, pistons 113a to 113d with double rod type hollow holes are respectively provided.
(Hereinafter, referred to as pistons 113a to 113d) are slidably inserted in the moving direction of the movable mold platen 109, and tie bars 115a to 113d are respectively attached to the pistons 113a to 113d.
The base end side of 115d is connected. In addition, each tie bar 1
15a to 115d extend horizontally toward the movable mold board 109 side.

[0005] Incidentally, the reference numerals having the characters "c" and "d", which are indicated by parentheses in the figure, have the same cross-sectional shapes as the respective reference numerals having the characters "a" and "b". And that they are arranged at different positions in the thickness direction of the paper. For example, the piston 113c in FIG.
13c) ", and the piston 113c
Indicates that the piston 113a has the same cross-sectional shape as the piston 113a and is disposed at a position different from the piston 113a in the thickness direction of the drawing.

Further, in the drawing, each code having the letters a to d indicates that there is a correspondence between each code having the same letter. For example, in the above-described configuration, the type A piston 113a is inserted into the tightening cylinder 65a, and a tie bar 115a is inserted into the piston 113a.
Are connected to each other, and similarly, a piston 113b is inserted into the mold clamping cylinder 65b.
It shows that the base end side of the tie bar 115b is connected to the piston 113b. Hereinafter, similarly, the symbols having the letters a to d are parts that have a corresponding relationship with each other. Show.

[0007] Further, among the components having the above-mentioned reference numerals a to d, those having no difference in configuration and function between the respective components having the reference numerals a to d will be hereinafter referred to as ad for convenience. May be abbreviated. For example, the tie bars 115a to 115d have the same configuration and the same function, respectively.
It is assumed that tie bars indicated by .about.115d are described.

The tie bars 115 respectively penetrate through the insertion holes 110 formed in the movable platen 109, and the tip ends thereof are fixed to support plates (not shown). A hydraulic fixing device 121 for fixing the movable platen 109 and the tie bar 115 by hydraulic pressure is disposed in each of the insertion holes 110 formed in the movable platen 109, and the movable platen 109 is fixed. The tie bar 115 and the movable platen 109 are locked when reaching a predetermined position with respect to the platen 105.

A fixed mounting plate 105 is fixedly provided with one mounting portion of a mold moving device (not shown), and the other mounting portion of the metal moving device is fixed to a movable mold plate 109. By operating the mold advance / retreat device, the movable mold board 109 and the movable mold 107 are brought close to the fixed mold board 105 at high speed while being guided by the tie bar 115 while facing the fixed mold board 105, In addition, it can be moved away.

Further, electro-hydraulic servo valves 66a to 66d (hereinafter referred to as electromagnetic servo valves 66a to 66d) are connected to the mold clamping cylinders 65a to 65d, respectively, and these electromagnetic servo valves 66a to 66d are connected to each other. In response to a command from a control device (not shown), the movable mold plate 109 can be independently moved in a direction facing the fixed mold plate 105.

Further, position sensors 7a to 7d are attached near the insertion holes 110a to 110d in the movable mold board 109, respectively. The movable mold board 109 is located near the tie bars 115a to 115d in the movable mold board 109. 109 and the fixed mold plate 105, and thus the pistons 113a to 113c in the mold clamping cylinders 65a to 65d.
The position of 113d in the axial direction can be detected.

Further, each of the electromagnetic servo valves 66a to 66d is
It is connected to an accumulator 720 and a pressure reducing valve with electromagnetic pilot 710 (hereinafter, referred to as a pressure reducing valve 710) for adjusting the pressure of the operating hydraulic pressure and setting the inlet pressure of the electromagnetic servo valves 66a to 66d. Between the accumulator 720 and the variable flow regulating valve 68.
0 is provided.

Further, a control device (not shown) includes mold clamping cylinders 65a-6c detected by the position sensors 7a-7d.
The position information of each of the pistons 113a to 113d in 5d is compared with specified values pre-recorded in the control device, and when the difference between them exceeds a predetermined value, the electromagnetic servo valve 66
a to 66d can be controlled to adjust the supply amount of pressure oil to the mold clamping cylinders 65a to 65d.

With such a configuration, first, a mold moving device (not shown) is driven to drive the movable mold plate 109.
Is moved to the fixed mold plate 105 side at high speed while being guided by the tie bar 115. When the fixed mold 103 and the movable mold 107 are substantially closed, the hydraulic fixing machine 121 is operated to fix the movable mold board 109 to the tie bar 115. Next, pressurized oil is supplied to each of the mold clamping cylinders 65a to 65d, and the tie bar 115 is supplied.
Is contracted to move the movable mold board 109 to the fixed mold board 1.
05, the fixed mold 103 and the movable mold 107 are strongly clamped, and the fixed mold 103 and the movable mold 107 are pressed by the pressure between the fixed mold 103 and the movable mold 107 when the molding material 100 which is a plastic resin is injected. Attempts to open the 103 and the movable mold 107 are suppressed.

Here, the fixed mold 103 and the movable mold 107
When the molding material 100 is injected between the molds and the mold is clamped by the plurality of mold clamping cylinders 65a to 65d, at least the movable mold plate 109 moves at a predetermined variable speed while moving in parallel toward the fixed mold plate 105. The respective clamping cylinders 65a-6 detected by the position sensors 7a-7d.
The position information of each of the pistons 113a to 113d in 5d is compared with a prescribed value set in advance by the control device.

Among the mold clamping cylinders 65a to 65d, in a particular mold clamping cylinder (for example, mold clamping cylinder 65b), a piston (piston 1) corresponding to the particular mold clamping cylinder.
13b) When the difference between the position information of 13b) and the specified value preset by the control device is equal to or larger than a predetermined value, the electromagnetic servo valve corresponding to the specific mold clamping cylinder (mold clamping cylinder 65b) is controlled by the control device. (Electromagnetic servo valve 66b),
The movement speed of the piston (piston 113b) in the specific mold-clamping cylinder (mold-clamping cylinder 65b) is controlled by adjusting the amount of pressurized oil supplied to the specific mold-clamping cylinder (mold-clamping cylinder 65b).

That is, at the time of mold clamping, each piston 113a-113 in each mold clamping cylinder 65a-65d.
The position information of d is always compared with the specified value,
a to 65d, a delay occurs in the movement of the piston, and for a specific mold clamping cylinder in which the delay amount is larger than a predetermined value, the delay amount of the specific mold clamping cylinder is within a predetermined value. The fixed die 10 is controlled by increasing and decreasing the moving speed of the piston in the mold clamping cylinder.
The mold clamping is performed in a state where the mold 3 and the movable mold 107 are parallel to each other.

Further, as another conventional mold clamping control device of an injection compression molding machine, a mold clamping control device of an injection compression molding machine that moves a movable mold plate in parallel by using an electric flow control valve (Japanese Patent Laid-Open Publication No. Hei 8- No. 25444) is known, and FIG.
FIG. 2 is a longitudinal sectional view schematically showing a configuration of a main part of the device.
The mold clamping control device of the injection compression molding machine using the electric flow control valve shown in FIG. 9 also has a fixed mold plate 201 not shown, similarly to the mold clamping control device of the conventional injection compression molding machine shown in FIG. The fixed die 201 is fixed to one end of the bed, and a fixed die 207 is attached to the fixed die plate 201.
Further, on the bed, a movable mold plate 202 with a movable mold 208 is slidably mounted on the bed so as to face the fixed mold plate 201. The resin 210 injected into the cavity 209 formed between the fixed mold 207 and the movable mold 208 is compressed and molded.

At the four corners of the fixed mold plate 201, mold clamping cylinders 204 are provided, respectively. In these mold clamping cylinders 204, mold clamping rams 205 fixed to tie rods 203 are fitted and inserted. I have. Each tie rod 203 extends horizontally toward the movable mold platen 202, and the tip ends thereof are fixed to the movable mold platen 202, respectively. A nut 206 is fixedly mounted on each tie rod 203 on the opposite side of the movable mold plate 202, and the clamping force is applied from the mold clamping ram 205 through the nut 206 and the tie rod 203 to the fixed mold plate 201 and the movable mold plate 2.
02.

Further, an electric flow regulating valve 2 is provided in each of the mold-side hydraulic passages 222 communicating with each mold-clamping cylinder 204.
12 are provided. These electric flow regulating valves 21
2 controls the flow rate of the pressure oil to each mold clamping cylinder 204 to be constant so that the mold oil flow rate of each mold clamping cylinder 204 can be set to one stage or two or more stages and can be compressed. Further, the setting flow rate of the mold clamping oil is changed based on a predetermined flow rate control flow.

With such a configuration, in the mold clamping control device of the injection compression molding machine using the conventional electric flow control valve, the electric flow control is automatically performed according to the thickness deviation at the four corners of the actual molded product. The set value of the regulating valve 212 is corrected and calculated and changed, and the molding 1
The mold clamping pressure is controlled so that the thickness deviation of the molded product is corrected in the next shot for each shot, and the thickness of the molded product is made uniform.

[0022]

By the way, in the conventional clamping method of the injection compression molding machine shown in FIG. 8 disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-269750, the pressure of the clamping pressure is reduced by using a pressure reducing valve 710. Normally, the pressure reducing valve starts to open from a pressure lower than the set pressure (ie, the clamping pressure in the clamping control device of the injection compression molding machine) and releases a part of the hydraulic oil to the tank. The characteristic (override characteristic) of the pressure reducing valve 710 is evaluated based on the relationship between the value obtained by (load pressure) / (set pressure) and the flow rate of the hydraulic oil passing through the pressure reducing valve 710.

Generally, the pressure reducing valve 710 is set at a set pressure of -15.
The valve starts to open at kg / cm ^{2 to} -20 kg / cm ² [The meaning of minus (-) indicates a state 15 kg / cm ² to 20 kg / cm ² lower than the set pressure.] In the mold clamping control device of a conventional injection compression molding machine, the injection compression process proceeds, and a predetermined mold clamping pressure of -15 is discharged.
kg / cm ² to −20 kg / cm ² , the pressure reducing valve 71
A value of 0 releases part of the hydraulic oil to the tank, and the injection compression speed decreases. That is, when the mold clamping pressure is about 20 kg / cm ² (or 20 kg / cm ² or less), the pressure reducing valve 710 is controlled by the override characteristic of the pressure reducing valve 710 so that the hydraulic oil supplied immediately after the start of the injection compression process is discharged. There is a problem that the required compression speed at the time of mold clamping cannot be realized because part of the pressure is released to the tank.

The inlet pressure (original pressure) at each of the electromagnetic servo valves 66a to 66d is set by the pressure reducing valve 710. When the set value of this original pressure is low, the load pressure (that is, the pressure of the injection compression molding machine) is reduced. The pressure difference between the mold clamping pressure in the mold clamping control device) and the original pressure is reduced, and the electromagnetic servo valves 66 a to 66
As for d, in order to realize the command flow rate, it is necessary to increase the opening degree of a spool provided therein. This allows
The time required for the movement of the spool in the electromagnetic servo valves 66a to 66d becomes longer, the control response of the mold clamping pressure decreases, and the repeatability, reproducibility, or stability during pressure control becomes insufficient. There is a problem that.

Further, in the above-mentioned conventional mold clamping control device of an injection compression molding machine, the differential pressure is determined by the original pressure and the mold clamping pressure. In general, in a hydraulic circuit using a servo valve, a servo valve is used. Is required to maintain the source pressure at a high pressure and at a constant level. In the above-described mold clamping control device of the conventional injection compression molding machine, if the original pressure is constant, the differential pressure between the original pressure and the mold clamping pressure is determined only by the value of the mold clamping pressure. Since the source pressure changes and the pressure control system becomes complicated, it is difficult to determine the optimum feedback gain. That is, the electromagnetic servo valves 66a to 66a
When the inlet pressure (source pressure) of 6d changes, the optimum gain of the feedback control also changes, so that speed control with the optimum gain cannot be performed, and the reproducibility and stability during pressure control also become insufficient. There is a problem of getting it.

Further, the pressure reducing valve with the electromagnetic pilot is expensive, and there is a problem that the cost of the mold clamping control device of the injection compression molding machine is increased. Further, Japanese Patent Application Laid-Open No. Hei 8-25444
In the conventional mold clamping control apparatus for an injection compression molding machine using an electric flow control valve shown in FIG. 9 which includes an electric flow control valve 212 instead of a servo valve, the electric flow control valve 212 shown in FIG. Although the position of the mold clamping cylinder 204 in the mold clamping ram 205 is controlled by the flow rate regulating valve 212, the proportional electromagnetic flow regulating valve usually used as the electric flow regulating valve 212 has a low response. Because of the low hysteresis, the position of the mold clamping ram 205 in the mold clamping cylinder 204 cannot be stably fed back and controlled. For this reason, since the control at the time of mold clamping is open control of the flow rate, there is a problem that the parallelism cannot be maintained.

The present invention has been made in view of these problems, and comprises a constant working fluid pressure source for supplying a constant pressure working fluid to a mold clamping cylinder, and at least one of the molds is provided. By adopting a contrivance such as parallel movement, it is possible to perform parallel movement control under a stable mold clamping pressure during mold clamping, and it is economical to manufacture at low cost and economical. An object of the present invention is to provide a mold clamping control device and a mold clamping control method for a molding machine.

[0028]

According to a first aspect of the present invention, there is provided a mold clamping control device for a compression molding machine, wherein a plasticized molding material is stored between a pair of relatively movable molds. A constant working fluid pressure source that supplies a working fluid at a constant pressure in a compression molding machine that performs compression molding with a plurality of mold clamping cylinders;
A servo valve mechanism for receiving a working fluid from the constant working fluid pressure source and adjusting a moving speed of a movable portion in the plurality of mold clamping cylinders and a working fluid pressure supplied to the plurality of mold clamping cylinders; Position detecting means for detecting a movable portion position in the mold clamping cylinder, fluid pressure detecting means for detecting a working fluid pressure at the time of mold clamping to at least one of the plurality of mold clamping cylinders, And performing pressure control and speed / position control on the plurality of mold clamping cylinders in cooperation with each other based on the detection results obtained by the position detection means and the fluid pressure detection means during compression molding of the molded article. And a control means for controlling the servo valve mechanism so as to move at least one of the pair of dies in parallel.

According to a first aspect of the present invention, there is provided a mold clamping control device for a compression molding machine, wherein the fluid pressure detecting means includes a plurality of pressure sensors for respectively detecting working fluid pressures to the plurality of mold clamping cylinders. (Claim 2). Also,
2. The mold clamping control device for a compression molding machine according to claim 1, wherein said fluid pressure detecting means comprises two of said plurality of mold clamping cylinders.
A plurality of pressure sensors for respectively detecting the working fluid pressure to the mold clamping cylinder may be provided (claim 3).

Further, in the mold clamping control device for a compression molding machine according to claim 1, the fluid pressure detecting means detects a working fluid pressure to one of the plurality of mold clamping cylinders. It may be configured to include two pressure sensors (claim 4). Further, in the mold clamping control device of the compression molding machine of the present invention, the control means may control the plurality of mold clamping cylinders based on the detection result of the position detecting means and the speed / position control reference value. First speed / position control means for performing position control, and during the control by the first speed / position control means,
When the operating pressure of the fluid pressure detecting means at the time of mold clamping to any one of at least one of the plurality of mold clamping cylinders reaches a predetermined value, the first speed / position Pressure control means for performing pressure control on a specific mold clamping cylinder to which the predetermined working fluid pressure is supplied in preference to control by the control means; and Prior to the control by the first speed / position control means, the speed / speed following the specific mold clamping cylinder is given to other mold clamping cylinders other than the specific mold clamping cylinder.
A second speed / position control means for performing position control is provided (claim 5).

Further, according to the present invention, there is provided a mold clamping control method for a compression molding machine, wherein a plasticized molding material is accommodated between a pair of relatively movable molds and compression molded by a plurality of mold clamping cylinders. In performing the mold clamping control on the machine, first, based on the movable part position detection results in the plurality of mold clamping cylinders and the speed / position control reference value, the speed / position control is performed on the plurality of mold clamping cylinders. After that, in a state where the speed / position control is being performed, when the working fluid pressure to any one of the at least one clamping cylinder of the plurality of clamping cylinders becomes a predetermined value, Prior to the speed / position control, pressure control is performed on a specific mold clamping cylinder to which the predetermined working fluid pressure is supplied, and another mold clamping other than the specific mold clamping cylinder is performed. For cylinder Is characterized in that to proceed with the speed-position control following the said specific mold clamping cylinder (claim 6).

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (A) Description of First Embodiment FIGS. 1 to 3 show a mold clamping control device of an injection compression molding machine according to a first embodiment of the present invention, and FIG. FIG. 2 shows a longitudinal section of a main part of a mold clamping control device of a molding machine and also shows a control system thereof. FIG. 2 is a side view schematically showing the structure of a partly broken part of the molding machine. FIG. FIG. 3 is a functional block diagram showing

As shown in FIGS. 1 and 2, the mold clamping control device of the injection compression molding machine comprises a fixed mold plate 5 fixed to one end portion (see the right portion in FIG. 2) of the upper surface of the support frame 1.
The fixed mold plate 5 is provided with a fixed mold 3. On the other end of the upper surface of the support frame 1 (on the left side in FIG. 2), a mold plate slide mechanism 30 is provided so that the movable mold plate 9 to which the movable mold 7 is attached faces the fixed mold plate 5. Is placed via.

That is, the mold plate slide mechanism 30 includes a rail 39, a linear bearing 35, and a table 37, and the movable mold plate 9 is placed on the table 37. Rail 3 fixed to
9 is guided over a linear bearing 35 so that the movable platen 9 is supported by the support frame 1.
Is slidably mounted with respect to.

Further, a plurality of (four in the present embodiment) mold clamping cylinders 11a to 11d having small strokes and large cross-sectional areas (the mold clamping cylinders 11c and 11d are shown near the outer peripheral portion of the fixed mold plate 5). ) Are provided at required intervals, and these mold clamping cylinders 11a to 11a
The rams 13a to 13d are slidably fitted in the moving direction of the movable mold plate 9 in 1d, and the base ends of the tie bars 15a to 15d are connected to the rams 13a to 13d. or,
Each of the tie bars 15a to 15d extends horizontally toward the movable mold plate 9 side.

Also in this embodiment, the reference numerals having the characters "c" and "d", which are indicated by parentheses in the figure, are the same as the reference numerals having the characters "a" and "b", respectively. And that they are arranged at different positions in the thickness direction of the paper. For example, the mold clamping cylinder 11c is indicated as "11a (11c)" in FIG. 1. The mold clamping cylinder 11c has the same cross-sectional shape as the mold clamping cylinder 11a. It is shown that they are arranged at different positions in the thickness direction of the drawing.

Also in this embodiment, a
The symbols having the characters “-d” indicate that there is a correspondence between the symbols having the same character. For example, in the above-described configuration, the mold clamping cylinder 11
a is fitted with a ram 13a, and the base end of the tie bar 15a is connected to the ram 13a. Similarly, the ram 13b is fitted into the mold clamping cylinder 11b,
It also shows that the base end of the tie bar 15b is connected to the ram 13b.
Codes having the letters a to d indicate that they are parts that correspond to each other. Parts having characters c and d are not shown for convenience.

Further, among components having the above-mentioned reference numerals a to d, those having no difference in structure and function between the respective components having the reference numerals a to d will be described below.
For the sake of convenience, the symbols a to d may be omitted for convenience.
For example, the tie bars 15a to 15d have the same configuration and the same function, respectively.
Hereinafter, when the tie bar 15 is referred to, reference numerals 15a to 15d are used.
The tie bar indicated by is indicated.

The tie bars 15 penetrate through the respective insertion holes 27 formed in the movable die plate 9, and a plurality of rings of the same pitch are provided on the outer periphery near the end of each tie bar 15. A groove 28 is formed, and the movable die 7 of the movable die plate 9 in the tie bar 15 is further formed.
A half nut 29 is provided for each tie bar 15 on the surface opposite to the surface on which is mounted so as to be openable and closable.

Each half nut 29 is engaged with and disengaged from a plurality of ring grooves 28 of equal pitch formed on each tie bar 15, and can be freely opened and closed in a direction substantially perpendicular to the axial direction of the insertion hole 27. And is opened and closed by a hydraulic cylinder or the like (not shown). A support member 33 is fixed to the movable die 9 on the side of the mounting surface of the half nut 29.
Is the tie bar 15 on the head side of the ram 13 with the half nut 29 closed (each ram 1 in FIGS. 1 and 2).
When the tie bar 15 is pressed in the mold opening direction (left direction in FIGS. 1 and 2), the half nut 29 is supported, and the movable mold plate 9 and the movable mold 7 are supported. Are moved in accordance with the movement of the tie bar 15.

On the other hand, these clamping cylinders 11a to 11d
Tie bar 15a of rams 13a to 13d sliding inside
The rod 53a is provided on the end face on the side where .about.15d is not connected.
53d are connected to each other, and each rod 53a
53d extends horizontally in a direction opposite to the tie bars 15a to 15d. Each rod 53a-53d
Respectively penetrate the fixed mold plate 5, and position sensors 55 a to 55 d are respectively provided at the distal ends thereof.

Each of the rods 53a to 53 in the fixed mold board 5
At positions near d, scales 57a to 57d each having a detection scale or a detection scale magnet are respectively provided with rods 53a to 53d.
53d, these scales 57
a to 57d and the position sensors 55a to 55d cooperate to function as position detecting means. That is, the scales 57a to 57d and the position sensors 55a to 55d detect the positions of the rams 13a to 13d in the mold clamping cylinders 11a to 11d as indicated by reference numerals A and B in FIG. The position (movable part position) of each ram 13 in the cylinder 11 can be detected.

Further, a moving cylinder 17 is fixed to the lower part of the fixed mold board 5 (see FIG. 2), and the moving rod 2 connected to the internal piston 18 of the moving cylinder 17 is fixed.
0 is connected / fixed to the lower part of the movable mold board 9 so that the movable mold board 9 and the movable mold 7 move while being guided by the tie bar 15 following the movement of the internal piston 18 of the movable cylinder 17. (See FIG. 2).

Further, by clamping the fixed mold 3 and the fixed mold 7, a mold cavity having the same shape as the outer shape of the molded product is provided between the fixed mold 3 and the fixed mold 7. 21 are formed. An injection cylinder 19 is provided at a position on the fixed mold plate 5 opposite to the fixed mold 3,
A molten resin 100 as a plasticized molding material is injected from the injection cylinder 19 between the fixed mold 3 and the movable mold 7. Note that the two-dot chain line in FIG. 2 shows the position of the movable mold plate 9 and the like in a state where the fixed mold 3 and the movable mold 7 are closed.

The position sensor 4 is provided above the movable mold platen 9.
A scale 43 having a detection scale or a detection scale magnet is arranged in parallel with the tie bar 15 at an upper position near the position sensor 41. The positions of the movable mold plate 9 and the movable mold 7 can be detected by cooperating with each other.

As shown in FIG. 1, the present apparatus comprises a hydraulic pump 65, an accumulator 67, and a relief valve 68.
And a constant working fluid pressure source 80 configured with With this constant working fluid pressure source 80, the electromagnetic servo valves 61 a to 61
Pressure oil (working fluid) of a constant pressure can be supplied to 61d, so that the hydraulic pressure at the inlet portions of the respective electromagnetic servo valves 61a to 61d can be kept constant.

The electromagnetic servo valves 61a to 61d excite their solenoids 62a to 62d to excite the spools 64a to 64d.
By switching d, the pressure oil supplied through the pipe 69 is supplied to the pipes 70a to 70d and 71a to 71d, the supply amount of the pressure oil is adjusted, and the supply of the pressure oil is stopped. You can do it.

The pipes 70a to 70d communicate the electromagnetic servo valves 61a to 61d with the oil chambers on the movable mold plate 9 side of the rams 13a to 13d of the mold clamping cylinders 11a to 11d. 71d communicates the electromagnetic servo valves 61a-61d with the oil chambers on the rod 53 side of the rams 13a-13d of the mold clamping cylinders 11a-11d.

That is, via the pipes 70a to 70d,
Pressurized oil is supplied to the ram 13 in each of the mold clamping cylinders 11a to 11d.
By supplying to the movable chamber 9 side oil chambers a to 13d,
The rams 13a to 13d and thus the tie bars 15a to 15d are moved toward the rods 53a to 53d, and the movable mold plate 9 and the movable mold 7 are drawn toward the fixed mold plate 5 to perform mold clamping.
Further, at this time, the movement of the rams 13a to 13d in the mold clamping cylinders 11a to 11d can be individually controlled.

The pipes 70a to 70d are provided with hydraulic sensors 63a to 63d as fluid pressure detecting means, respectively. The hydraulic sensors 63a to 63d are connected to the respective pipes 70a to 70d (that is, mold clamping cylinders). 11a-1
Oil chamber on the movable mold plate 9 side of the rams 13a to 13d in 1d)
The hydraulic pressure during mold clamping can be measured.
It has a function as a feedback sensor for controlling the clamping pressure of each of the clamping cylinders 11a to 11d.

Further, as shown in FIG. 1, the present apparatus has a control device 75 as control means for controlling the electromagnetic servo valves 61a to 61d. This control device 75
The control device 75 includes a speed / position control device 91, a pressure control device 92, a second speed / position control device 93, and a high-speed movement control device 94. The hydraulic pressure information measured by each of the hydraulic pressure sensors 63a to 63d is input, and each of the position sensors 55a to 55d as shown by arrows (1) to (4) in FIG.
The position information measured by 55d is also input, and further, as indicated by the arrow [1] in FIG. 1, the position information measured by the position sensor 41 is also input.

Here, the first speed / position control device 91
Scales 57a to 57d and position sensors 55a to 55
d and the speed and the speed
Based on the position control reference value, each mold clamping cylinder 11a
11d functions as first speed position / position control means for performing speed / position control on 11d. Further, during the control of each of the mold clamping cylinders 11 a to 11 d by the first speed / position control device 91, the pressure control device 92
In a to 63d, when the hydraulic pressure (working fluid pressure) at the time of mold clamping to any one of the plurality of mold clamping cylinders 11a to 11d reaches a predetermined value, control by the first speed / position control device 91 is performed. And functions as pressure control means for performing pressure control on a specific mold clamping cylinder to which a predetermined hydraulic pressure is supplied.

Further, the second speed / position control device 93
At the time of pressure control by the pressure control device 92, the speed / position following the specific mold clamping cylinder is given to other mold clamping cylinders other than the specific mold clamping cylinder in preference to the control by the first speed / position control device 91. It functions as second speed / position control means for performing control. That is, the control device 75
The first speed / position control device 91, the pressure control device 92, and the second speed / position control device 93 control the solenoids 62a to 62d of the electromagnetic servo valves 61a to 61d.

The high-speed movement control device 94 controls the speed and the position of the moving cylinder 17 based on the position information set in advance and the position information from the position sensor 41. Here, the function of the control device 75 in the present device will be described. As shown in FIG. 3, the control device 75 includes a central control device 169, a mold clamping cylinder control device 17
1a to 171d, a control device 72 for a moving cylinder, and signal wires 77, 79, 81.

The central controller 169 controls each mold clamping cylinder 1
1a to 11d are replaced by mold clamping cylinder control devices 171a to 171.
1d, the reference value for speed / position control (reference speed, reference position) and a predetermined oil pressure value (for comparison with values detected by the oil pressure sensors 63a to 63d) are stored. The reference values for speed / position control are stored in the control devices 171a to 171 for the mold clamping cylinders.
1d can be notified.

The central control device 169 compares the detected pressure detected by each of the hydraulic pressure sensors 63a to 63d with a predetermined value recorded from the start of mold clamping by the mold clamping cylinder control devices 171a to 171d. In comparison, when the hydraulic pressure at the time of mold clamping in any one of the mold clamping cylinders 11 reaches a predetermined value, a corresponding mold clamping cylinder 11 is supplied to the specific mold clamping cylinder 11 to which the hydraulic pressure of the predetermined value is supplied. While performing pressure control using a control device (any of 171a to 171d), the other mold clamping cylinders 11
Each of the clamp-clamping cylinder control units 171a to 171d controls the speed and position of the clamp-clamping cylinder 11 to which the hydraulic pressure of the predetermined value is supplied.
Is controlled.

Each of the oil pressure sensors 63a to 63d sends information on the detected pressure of the oil chamber on the movable mold platen 9 side in each of the corresponding mold clamping cylinders 11a to 11d to the central control unit 169, and the corresponding mold clamping cylinders Is sent to the control devices 171a to 171d.
Each of the position sensors 55a to 55d is connected to a corresponding one of the rams 13a to 13d in the corresponding mold clamping cylinder 11a to 11d.
Are sent to the corresponding clamping cylinder control devices 171a to 171d.

Further, each mold clamping cylinder control device 171a
To 171d are the corresponding oil pressure sensors 63a to 63d, respectively.
Information and the corresponding position sensor 5 sent from the
5a to 55d and the central controller 1
Based on the reference value for speed / position control indicated by 69,
The corresponding electromagnetic servo valves 61a to 61d are individually controlled to control the corresponding mold clamping cylinders 11a to 11d.

That is, the control device 171 for the mold clamping cylinder
a to 171d are operated by the position sensors 55a to 55d and the hydraulic pressure sensors 63 in accordance with instructions from the central control device 169.
The electromagnetic servo valves 61a to 61d are individually feedback-controlled based on the respective detection results from a to 63d and the reference values for speed / position control indicated by the central controller 169. Cylinders 11a to 11
In step d, the moving speeds and positions of the rams 13a to 13d and the mold clamping pressure are controlled.

Specifically, the control device 17 for the mold clamping cylinder
1a to 171d denote each detection result transmitted from each of the position sensors 55a to 55d and the oil pressure sensors 63a to 63d and the central control until the oil pressure at the time of mold clamping to any one of the mold clamping cylinders 11 reaches a predetermined value. Based on the speed / position control reference value transmitted from the device 169, the speed / position control is performed on each of the mold clamping cylinders 11a to 11d, and the hydraulic pressure at the time of mold clamping to one of the mold clamping cylinders 11 is reduced. After reaching the predetermined value, pressure control is performed on the specific mold clamping cylinder 11 to which the hydraulic pressure having reached the predetermined value is supplied, and the other mold clamping cylinders 11 are maintained at the predetermined value. Specific mold clamping cylinder 1 supplied with
The movable mold 7 is moved in parallel by performing the speed / position control following 1.

In this way, the control devices 171a to 171d for the mold clamping cylinders are controlled by the central control device 169, whereby the first speed / position control device 91, the pressure control device 92, and the second speed / speed control device 92 described above. Each has a function as the position control device 93. The moving cylinder control device 72 receives the position information of the movable cylinder 9 detected by the position sensor 41, and the position information detected by the position sensor 41 is recorded in the central control device 169 in advance. The moving cylinder 17 is stopped when it matches the reference value for position control.

The signal wiring 77 is a signal wiring for connecting the central control device 169 with the control devices 171a to 171d for clamping cylinders and the control device 72 for moving cylinders. 171
a to 171d are transmitted with reference values for speed / position control, and the central control device 169 sends the moving cylinder control device 7
The reference value for position control is transmitted to 2.
The mold compression pressure signal wiring 79 is a signal wiring for connecting the central control device 169 to the control devices 171a to 171d for the clamping cylinders and the control device 72 for the moving cylinder, and the central control device 169 and the control device for each clamping cylinder. 171a-
171d, and between the central control device 169 and the moving cylinder control device 72.

Further, the signal wiring 81 is connected to the central processing unit 16.
9 is a signal wiring for connecting each of the clamping cylinder control devices 171a to 171d, and transmits a signal from the central processing unit 169 to each of the clamping cylinder control devices 171a to 171d. It is instructed to switch to pressure control so that pressure control is performed on a specific mold clamping cylinder 11 to which the supplied hydraulic pressure is supplied.

The mold clamping control device of the injection compression molding machine according to the first embodiment of the present invention is configured as described above, and shows how the molding material is compression-molded using this device.
This will be described with reference to FIG. FIG. 4 is a flowchart for explaining a control procedure in the mold clamping control device of the injection compression molding machine of the present embodiment shown in FIGS. 1 and 2. The steps of the mold clamping control of the injection compression molding machine of the present embodiment include: 1) high-speed movement and stop of the movable mold board; 2) coupling of the movable mold board with the tie bar;
3) Start of mold clamping movement, 4) Injection of molten resin, 5) Control of parallel movement of movable mold during compression mold clamping, 6) Pressure holding, cooling, solidification, mold opening, and removal of molded product. Less than,
Each step will be described with reference to FIG.

1) Moving and Stopping the Movable Molding Board at High Speed First, the movable rod 20 is contracted by using the movable cylinder 17 while the fixed mold 3 and the movable mold 7 are sufficiently separated from each other. The board 9 and the movable mold 7 are moved to the fixed mold board 5 at high speed while being guided by the tie bars 15a to 15d (step A1).

In the vicinity of a position where the movable mold 7 and the fixed mold 3 approach each other and become almost closed, position information measured by the position sensor 41 and the scale 43 provided on the movable mold board 9 is used as a control device. When the position information matches the position control reference value preset in the central control device 169 of the control device 75, the moving cylinder 17 is stopped by the moving cylinder
Is stopped (step A2).

2) Coupling of the movable mold board and the tie bar Next, each movable nut 9 is closed by closing each half nut 29 and engaging with the ring groove 28 formed in each of the tie bars 15. It is fixed (step A3). 3) Start of mold clamping movement After that, under the control of the mold clamping cylinder controllers 171a to 171d in the controller 75, the respective electromagnetic servo valves 61a to 61d are opened, and pressurized oil is supplied to the pipes 71a to 71c. The molds of the clamping cylinders 11a to 11d are clamped. At this time, the positions of the rams 13a to 13d in the mold clamping cylinders 11a to 11d are detected by the position sensors 55a to 55d and the scales 57a to 57d, and transmitted to the mold clamping cylinder control devices 171a to 171d. These mold cylinder control devices 171a to 171d feedback-control each electromagnetic servo valve 61 based on the speed / position control reference value sent from the central control device 169, and move the movable mold plate 9 slowly in parallel. (Step A4).

During this time, the controller 75 monitors whether the position sensors 55a to 55d have detected the compression mold clamping start positions of the movable mold 7 and the fixed mold 3 (step A5). The movable mold plate 9 is moved in parallel until -55d detects the compression mold clamping start position between the movable mold 7 and the fixed mold 3 (see the NO route in step A5).

4) Injection of molten resin The position sensors 55a to 55d are
When the movable mold plate 9 and the compression mold clamping position of the movable mold 7 are detected, the YES route of step A5 is taken, the electromagnetic servo valves 61a to 61d are closed once, and the movement of the movable mold plate 9 is stopped. (Step A6), the movable mold 7
Injection cylinder 19 between molten resin 1 and
After injecting a predetermined amount of 00 (step A7), the electromagnetic servo valves 61a to 61d are opened again, and the pipes 71a to 71c are opened.
And pressurize the mold cylinders 11a to 11d.

5) Parallel movement control of movable mold at the time of compression mold clamping Here, mold clamping cylinders 11a to 11d are again controlled by position sensors 55a to 55d and scales 57a to 57d.
The positions of the respective rams 13a to 13d are detected and transmitted to the mold clamping cylinders 11a to 11d. The control devices 171a to 171d for the mold clamping cylinders include a central control device 169.
Feedback control of each electromagnetic servo valve 61 is performed based on the speed / position control reference value sent from the controller, and the movable mold plate 9 is moved slowly in parallel to perform compression mold clamping (step A8).

In the control device 75, the central control device 16
9 compares the pressure detected by each of the oil pressure sensors 63a to 63d with a pre-recorded predetermined value (set value of the mold clamping pressure) from the start of the movement of the mold clamping cylinders 11a to 11d (compression mold clamping) ( Step A9), each mold clamping cylinder 11a-1
The above-described compression mold clamping is performed until the oil pressure detected in any one of the mold clamping cylinders 11 in 1d reaches a predetermined value (see the NO route in step A9).

Here, if the hydraulic pressure detected in the mold clamping cylinder 11b among the mold clamping cylinders 11a to 11d reaches a predetermined value, for example, YES in step A9.
By taking the route, the switching control from the position control or the speed control to the pressure control is performed to the control device 171b for the mold clamping cylinder of the mold clamping cylinder 11b which first reaches the set pressure.

That is, as shown in FIG. 2, the molten resin 100 injected into the mold cavity 21 is biased toward the mold clamping cylinder 11b, and the hydraulic pressure sensor 63b on the side where the molten resin 100 is biased first receives the set pressure. , But
First, the control device 171b of the mold clamping cylinder 11b of the mold clamping cylinder 11b that has reached the set pressure is instructed to switch the control method from the position control or the speed control to the pressure control.

From this moment, in the control device 75, the mold clamping cylinder control device 171b controls the pressure of the mold clamping cylinder 11b, and the other mold clamping cylinder control devices 171a, 171c, 171d perform the mold clamping operation. Parallel control (position control for maintaining parallelism) of the movable mold plate 9 is performed on the cylinders 11a, 11c, and 11d by performing speed and position control that follows the mold clamping cylinder 11b that has reached the set pressure first. Perform (Step A10).

That is, while clamping the mold while controlling the pressure of the mold clamping cylinder 11b, the mold clamping cylinder 11a,
11c and 11d, the position sensors 55a and 55
c, 55d and the position information of the rams 13a, 13c, 13d detected by the scales 57a, 57c, 57d and the position information of the ram 13b detected by the position sensor 55b, and based on the result of the comparison. By controlling the controller 171a, 171c, 171d for each mold clamping cylinder, each mold clamping cylinder 11a, 11c, 11d is controlled.
The rams 13a, 13c and 13d in the above are followed by the ram 13b in the mold clamping cylinder 11b to perform the mold clamping.

That is, the position sensors 55a, 55c,
If the position of each ram 13a, 13c, 13d detected by the 55d and the scales 57a, 57c, 57d is ahead of the position of the ram 13b detected by the position sensor 55b, the control device 171a, 171
c, 171d, the electromagnetic servo valves 61a, 61c, 6
By closing 1d, the rams 13a, 13c, 13d are stopped.

Then, after the positions of the rams 13a, 13c and 13d are slightly delayed from the position of the ram 13b, the electromagnetic servo valves 61a, 61c and 61d are opened again to open the pipes 71a, 71c and 71d. Supply pressure oil to
Each ram 13a, 13c, 13d is moved forward, and the moving speed of each ram 13a, 13c, 13d is made equal to the moving speed of the ram 13b plus a speed proportional to the difference between the respective positions. Feedback control is performed.

6) Holding the Pressure, Cooling, Solidifying, Opening the Mold and Removing the Molded Product After the movable mold 7 has reached the cutoff position of the compression mold with respect to the fixed mold 3, the fixed mold 3 and the movable mold 7 are fixed to predetermined positions. While maintaining the pressure for a time, the molded product (molten resin 100) between the fixed mold 3 and the movable mold 7 is cooled and solidified (step A1).
1) This time, the controller 75 controls each electromagnetic servo valve 61
a-61d, the mold clamping cylinder 1
The rams 13a to 13d in 1a to 11d are moved in the mold opening direction to separate the fixed mold 3 and the movable mold 7 from each other.

Further, after opening each half nut 29 to release the engagement with the tie bar 15, respectively, the internal piston 18 of the movable cylinder 17 is moved at a high speed to extend the movable rod 20, whereby the movable mold 7 is connected. The fixed mold 3 is separated, and the molded product is taken out (Step A12).
Here, the number of molded articles produced is counted (step A1).
3) When the number of molded articles reaches the planned production number (step A13)
The injection compression molding machine is stopped as a production end (Step A14), and when the number of products to be produced is not reached (see the NO route of Step A13), the process returns to Step A1, and Steps A1 to A12 are performed again. The molding is performed by performing the above-mentioned treatment.

In the above embodiment, the mold clamping cylinder 1
Although the case where the hydraulic pressure detected in 1b first reaches a predetermined value is described, the present invention is not limited to this, and the mold clamping cylinders 11a and 11a other than the mold clamping cylinder 11b may be used.
Even when the hydraulic pressure detected in any of the mold clamping cylinders of 11c and 11d first reaches a predetermined value, mold clamping can be performed in the same manner as described above.

As described above, according to the mold clamping control device and the mold clamping control method of the injection compression molding machine according to the first embodiment of the present invention, the positions of the rams 13a to 13d in the mold clamping cylinders 11a to 11d are determined. Detected by the position sensors 55a to 55d, receiving the detection results of these position sensors 55a to 55d,
When the molten resin 100 is formed into a molded product having an asymmetrical shape by controlling the movable mold plate 9 in parallel by controlling the
Can be prevented, and a high-quality product can be manufactured.

Further, unlike the prior art, a relief valve 6 is used without using a pressure reducing valve with an electromagnetic pilot or a variable flow control valve.
The solenoid servo valves 61a to 61a
Since the inlet pressure at 1d can be kept constant,
The response gain of the feedback control in the characteristics (opening-flow characteristics) of the electromagnetic servo valves 61a to 61d when the mold clamping cylinders 11a to 11d are controlled in parallel (speed and position control) can be selected in the optimal region, and the stability can be improved. Compression molding can be realized. Also, unlike the prior art, there is no reduction in the compression speed due to the override characteristic as when using a pressure reducing valve with an electromagnetic pilot, thereby improving the repeatability and stability of the mold clamping pressure and improving the productivity. Can be done. Furthermore, since the control response of the mold clamping pressure does not decrease even at the time of mold clamping with a low mold clamping pressure, the repeatability, reproducibility or stability at the time of pressure control is improved, and compression molding can be performed safely. Can be performed, and the productivity can be improved.

Further, an expensive pressure reducing valve with an electromagnetic pilot is not required, and the mold clamping control device of the injection compression molding machine can be manufactured at low cost and is economical. (B) Description of Second Embodiment FIGS. 5 and 6 show a mold clamping control device of an injection compression molding machine as a second embodiment of the present invention, and FIG. 5 is a mold clamping control device of the injection compression molding machine. FIG. 6 is a longitudinal sectional view showing a main part of the control system and a control system thereof. FIG. 6 is a functional block diagram showing a configuration of the control system.

As shown in FIG. 5, the mold clamping control device of the injection compression molding machine according to the second embodiment is different from the mold clamping control device of the injection compression molding machine of the first embodiment in that each cylinder 11
oil pressure sensors 63a to 63 provided for each of a to 11d
d, and among the mold clamping cylinders 11a to 11d,
The hydraulic pressure sensor 63 is provided only for one arbitrary mold clamping cylinder 11a.
The other parts are substantially the same as those of the mold clamping control device of the injection compression molding machine according to the first embodiment shown in FIGS. In FIG. 5, the same reference numerals as those in the description denote the same or almost the same parts, and a description thereof will be omitted.

Also in this embodiment, the symbols having the letters c and d, which are indicated by parentheses in the figure, are the same as the symbols having the letters a and b, respectively. And that they are arranged at different positions in the thickness direction of the paper. Also in this embodiment, in the figure, each code having the letters a to d indicates that there is a correspondence between each code having the same letter, and similarly, a Codes having the letters “-d” indicate that they are parts that correspond to each other.
Parts having characters c and d are not shown for convenience.

Further, among the components having the above-mentioned reference numerals a to d, those having no difference in structure and function between the components having the reference numerals a to d will be described below.
For the sake of convenience, the symbols a to d may be omitted for convenience.
Now, in the mold clamping control device of the injection compression molding machine according to the second embodiment, the hydraulic pressure sensor 63 is provided only on any one of the pipes 70a to 70d (that is, the mold clamping cylinders 11a to 11d). It is arranged.

Further, as shown in FIG. 5, the mold clamping control device of the injection compression molding machine according to the second embodiment also has an electromagnetic servo valve 61a.
The control device 75 'also has a first speed / position control device 91', a pressure control device 92 ', a second speed / position control device. 93 'and a high-speed movement control device 94'. As shown by arrows in FIG. 5, the hydraulic pressure information measured by the hydraulic pressure sensor 63 is input, and (1) to (4) in FIG. 5) As shown by the arrows, the position information measured by each of the position sensors 55a to 55d is also input, and further, as shown by the arrow [1] in FIG. Position information is also input.

Here, the first speed / position control device 91 '
Are scales 57a-57d and position sensors 55a-
55d and a reference value for speed / position control stored in advance, based on the speed / position control reference value.
First speed position for performing speed / position control on 1a to 11d
It functions as a position control means. Further, the pressure control device 92 'controls the mold clamping cylinders 11a to 11d measured by the hydraulic pressure sensor 63 during the control of each of the mold clamping cylinders 11a to 11d by the first speed / position control device 91'.
When the hydraulic pressure (working fluid pressure) at the time of mold clamping to an arbitrary one of the mold clamping cylinders 11a reaches a predetermined value, the hydraulic pressure (working fluid pressure) becomes a predetermined value prior to the control by the first speed / position control device 91 '. It functions as pressure control means for performing pressure control on a specific mold clamping cylinder 11 to which the supplied hydraulic pressure is supplied.

Further, the second speed / position control device 93 '
When the pressure is controlled by the pressure control device 92 ', the control is performed by the first speed / position control device 91' prior to the control by the first speed / position control device 91 '.
d, the speed following the specific mold clamping cylinder 11a
It functions as second speed / position control means for performing position control.

That is, the control device 75 'outputs the first speed
Position control device 91 ', pressure control device 92', second speed
Each of the electromagnetic servo valves 61a to 61
That is, each of the solenoids 62a to 62d of 1d is controlled. Also, the high-speed movement control device 94 '
The speed / position control of the moving cylinder 17 is performed based on the position information set in advance and the position information from the position sensor 41.

Here, the function of the control device 75 'in the present apparatus will be described. As shown in FIG. 6, the control device 75' is the control device 75 'in the mold clamping control device of the injection compression molding machine of the first embodiment. Similarly to the mold clamping cylinder control devices 171a to 171d, the moving cylinder control device 72
And signal wirings 77, 79, 81, and a central control device 169 '.

The central control device 169 'controls the mold clamping cylinders 11a to 11d by controlling the mold clamping cylinder control device 171a.
Through 171d, and stores a reference value for speed / position control (reference speed, reference position) and a predetermined oil pressure value (for comparison with a value detected by the oil pressure sensor 63). The reference values for speed / position control can be notified to the control devices 171a to 171d for the mold clamping cylinders.

The central control device 169 'receives the position information of the movable cylinder 9 detected by the position sensor 41. The position information detected by the position sensor 41 is stored in the central control device 169' in advance. When the position coincides with the position control reference value recorded in the device 169 ', the moving cylinder 17 is stopped by the moving cylinder control device 72.

Further, the central control device 169 'compares the detected pressure detected by the hydraulic pressure sensor 63 with a predetermined value recorded before the start of mold clamping by the control devices 171a to 171d for the mold clamping cylinders. When the pressure detected by the hydraulic pressure sensor 63 reaches a predetermined value, the control unit 17 for the specific clamping cylinder 11a
1a is used to control the pressure, while the other mold clamping cylinders 11b to 11d are
The movable mold 7 is moved in parallel by controlling the other mold-clamping cylinder controllers 171b to 171d so as to perform speed / position control that follows the control.

The hydraulic pressure sensor 63 sends information on the detected pressure of the oil chamber on the movable mold platen 9 side of the mold clamping cylinder 11a to the central control device 169 'and also to the mold clamping cylinder control device 171a. Each of the position sensors 55a to 55d is
The position information of each of the rams 13a to 13d in a to 11d is stored in the corresponding mold clamping cylinder control device 171a.
To 171d.

Control devices 171a to 171 for mold clamping cylinders
1 d is individually set for each of the corresponding electromagnetic servo valves 61 a to 61 d based on the position information sent from the corresponding position sensors 55 a to 55 d and the reference value for speed / position control indicated by the central controller 169 ′. To control the corresponding mold clamping cylinders 11a to 11d. Further, the mold clamping cylinder control device 171a
The oil pressure information sent from the oil pressure sensor 63 and the position information sent from the position sensor 55a, and the central control device 169 '
The control for the electromagnetic servo valve 61a is performed based on the speed / position control reference value indicated by
1a can also be controlled.

That is, the control device 171 for the mold clamping cylinder
The position sensors 55a to 55d and the oil pressure sensors 63a to 171d are operated in accordance with a command from the central control device 169 '.
, And each of the electromagnetic servo valves 61a to 61d is individually subjected to feedback control based on the detection results from the CPU and the reference value for speed / position control indicated by the central control device 169 '. -11d, the moving speeds and positions of the rams 13a to 13d and the clamping pressure are controlled.

Specifically, the control device 17 for the mold closing cylinder
1a to 171d are the detection results transmitted from the position sensors 55a to 55d and the oil pressure sensor 63 until the oil pressure at the time of mold clamping to the specific mold clamping cylinder 11a provided with the oil pressure sensor 63 becomes a predetermined value. And the central controller 1
Based on the speed / position control reference value transmitted from 69 ', speed / position control is performed on each of the mold clamping cylinders 11a to 11d.

After the oil pressure at the time of clamping the specific mold clamping cylinder 11a provided with the hydraulic pressure sensor 63 has reached a predetermined value, pressure control is performed on the specific mold clamping cylinder 11a, Mold clamping cylinders 11b to 11d
, Speed / position control following the specific mold clamping cylinder 11a is performed. In this way,
The control devices 171a to 171d for the mold clamping cylinders are controlled by the central control device 169 ', so that the above-described first speed / position control device 91', pressure control device 92 ', and second speed / position control device 93'. Each has a function as.

The moving cylinder control device 72 receives the position information of the movable cylinder 9 detected by the position sensor 41. The position information detected by the position sensor 41 is stored in the central control device 169 in advance. ′, The position of the moving cylinder 1
7 is stopped. The signal wiring 77 includes a central control device 169 'and a control device 171a for each clamping cylinder.
171d and the moving cylinder control device 72. The signal wiring is used to transmit the speed / position control reference values from the central control device 169 'to the mold clamping cylinder control devices 171a to 171d. 16
The reference value for position control is transmitted from 9 'to the control device 72 for the moving cylinder, and the mold compression pressure signal wiring 79 is connected to the central control device 169' and the control devices 171a to 171d for each of the clamping cylinders and the moving device. Cylinder control device 7
2 is a signal wiring for connecting to the central control device 169 '.
And signals between the control devices 171a to 171d for the clamping cylinders and between the central control device 169 'and the control device 72 for the moving cylinder.

Further, the signal wiring 81 is connected to the central processing unit 16.
9 'to the control devices 171a to 171d for each mold clamping cylinder
And signal transmission from the central processing unit 169 'to each of the clamping cylinder control devices 171a to 171d so that pressure control is performed on a specific clamping cylinder 11a. This is for instructing switching to pressure control.

The mold clamping control device of the injection compression molding machine according to the second embodiment of the present invention is configured as described above, and shows how the molding material is compression-molded using this device.
This will be described with reference to FIGS. FIG. 7 is a flowchart for explaining a control procedure in the mold clamping control device of the injection compression molding machine according to the second embodiment shown in FIGS. The steps of the mold clamping control of the injection compression molding machine of this embodiment are also 1) moving and stopping the movable mold board at a high speed, 2) coupling the movable mold board with the tie bar, 3) starting the mold clamping movement, and 4) dissolving the molten resin. Injection, 5)
The control includes the parallel movement control of the movable mold at the time of compression mold clamping, 6) the steps of holding pressure, cooling, solidifying, opening the mold, and removing the molded product.
Hereinafter, each step will be described with reference to FIG.

1) High-speed movement and stop of the movable mold board First, with the fixed mold 3 and the movable mold 7 sufficiently separated from each other, the movable rod 20 is contracted by using the movable cylinder 17 to move the movable mold board. The board 9 and the movable mold 7 are moved to the fixed mold board 5 at high speed while being guided by the tie bars 15a to 15d (step B1).

In the vicinity of the position where the movable mold 7 and the fixed mold 3 approach each other and become almost closed, the position information measured by the position sensor 41 and the scale 43 provided on the movable mold board 9 is used as a control device. When the position information coincides with a position control reference value preset in the central control device 169 'of the control device 75', the moving cylinder 17 is stopped by the moving cylinder The mold plate 9 is stopped (step B2).

2) Coupling of movable mold board and tie bar Next, the movable mold board 9 is fixed to the tie bar 24 by closing the half nut 29 and engaging with the ring groove 28 formed in the tie bar 24 (step). B3). 3) Start of mold clamping movement After that, the electromagnetic servo valves 61a to 61d are opened by the control of the mold clamping cylinder controllers 171a to 171d in the controller 75 ', and pressurized oil is supplied to the pipes 71a to 71c. The molds of the clamping cylinders 11a to 11d are clamped. At this time, the positions of the rams 13a to 13d in the mold clamping cylinders 11a to 11d are detected by the position sensors 55a to 55d and the scales 57a to 57d, and transmitted to the mold clamping cylinder control devices 171a to 171d. These mold cylinder control devices 171a to 171d feedback-control each electromagnetic servo valve 61 based on the speed / position control reference values sent from the central control device 169 ′,
The movable platen 9 is slowly translated in parallel (step B4).

In the meantime, in the control device 75 ',
It is monitored whether or not the position sensors 55a to 55d have detected the compression mold clamping start positions of the fixed mold 3 and the movable mold 7 (Step B5). The movable die plate 9 is moved in parallel until the compression mold clamping start position is detected (see the NO route of step B5).

4) Injection of molten resin The position sensors 55a to 55d
When the movable mold plate 9 set to 9 'and the compression mold clamping position of the movable mold 7 are detected, the YES route of step B5 is taken, and the electromagnetic servo valves 61a to 61d are closed once to move the movable mold plate 9. Is stopped (step B6), a predetermined amount of the molten resin 100 is injected between the fixed mold 3 and the movable mold 7 from the injection cylinder 19 (step B7), and then again.
Open the electromagnetic servo valves 61a to 61d, and
1c is supplied with pressure oil to perform mold clamping of each mold clamping cylinder 11a to 11d.

5) Movable mold parallel movement control unit during compression mold clamping Here, the mold clamping cylinders 11a to 11d are again controlled by the position sensors 55a to 55d and the scales 57a to 57d.
The positions of the respective rams 13a to 13d are detected and transmitted to the mold clamping cylinders 11a to 11d. The control devices 171a to 171d for the mold clamping cylinders
The electromagnetic servo valve 61 is feedback-controlled based on the speed / position control reference value sent from the movable die 9 '.
Is slowly translated in parallel to perform compression mold clamping (step B
8).

In the control device 75 ', the central control device 1
69 'compares the pressure detected by the oil pressure sensor 63 with a pre-recorded predetermined value (set value of the mold clamping pressure) from the start of the movement (compression mold clamping) of the mold clamping cylinders 11a to 11d (step B9). The above-mentioned compression mold clamping is performed until the oil pressure detected in the specific mold clamping cylinder 11a provided with the oil pressure sensor 63 reaches a predetermined value (see the NO route in step B9).

Here, when the hydraulic pressure detected in the specific mold clamping cylinder 11a reaches a predetermined value (step B9).
Of this particular mold clamping cylinder 11a.
Is instructed to switch from position control or speed control to pressure control. That is, the molten resin 10 injected into the mold cavity 21
Although 0 is biased toward the mold clamping cylinder 11b as shown in FIG. 5, in the mold clamping control device of the injection compression molding machine according to the second embodiment, a specific mold clamping cylinder 11a provided with a hydraulic pressure sensor 63 is provided. For the mold clamping cylinder control device 171a,
An instruction to switch the control method from position control or speed control to pressure control is issued.

In FIG. 5, the mold cavity 21
The molten resin 100 injected into the mold is biased toward the mold clamping cylinder 11b, and in the state shown in FIG.
b, the mold clamping pressure increases, but each mold clamping cylinder 11a-1
The error of the mold clamping pressure at 1d is slight, and the parallel movement control of the mold clamping can be performed without any problem in practical use. From this moment, in the control device 75 ', the mold clamping cylinder control device 171a controls the pressure of the mold clamping cylinder 11a, and controls the other mold clamping cylinder control devices 171a.
b to 171d are specific clamping cylinders 1 provided with a hydraulic pressure sensor 63 with respect to the clamping cylinders 11b to 11d.
By performing speed / position control following 1a, parallel control (position control for maintaining parallelism) of the movable mold plate 9 is performed (step B10).

That is, mold clamping is performed while controlling the pressure of the mold clamping cylinder 11a,
For each of the rams 13b-1 to 11d detected by the position sensors 55b to 55d and the scales 57b to 57d.
By comparing the position information of 3d with the position information of the ram 13a detected by the position sensor 55a and controlling each of the clamping cylinder control devices 171b to 171d based on the comparison result, each of the clamping cylinders 11b is controlled. The mold clamping is performed by causing each of the rams 13b to 13d in to 11d to follow the ram 13a in the mold clamping cylinder 11a.

That is, each ram 13 detected by each of the position sensors 55b to 55d and the scales 57b to 57d.
If the positions of b to 13d are ahead of the position of the ram 13a detected by the position sensor 55a, the controller 171b to 171d for the mold clamping cylinder causes the electromagnetic servo valve 6 to move forward.
The rams 13b to 13d are stopped by closing 1b to 61d.

The positions of the rams 13b to 13d are
After the position is slightly delayed from the position of the ram 13a,
The electromagnetic servo valves 61b to 61d are opened again to open the pipe 71b.
To the rams 13b to 13d, and the moving speed of each of the rams 13b to 13d is added to the moving speed of the ram 13a by a speed proportional to the difference between the respective positions. That is, feedback control such as the following is performed.

6) Holding the Pressure, Cooling, Solidifying, Opening the Mold and Removing the Molded Product After the movable mold 7 has reached the cut-off position of the compression mold clamping with respect to the fixed mold 3, the fixed mold 3 and the movable mold 7 are fixed. While maintaining the pressure for a time, the molded product (molten resin 100) between the fixed mold 3 and the movable mold 7 is cooled and solidified (step B1).
1) This time, each electromagnetic servo valve 6 is controlled by the control device 75 '.
The reverse operation is performed on 1a to 61d, and the rams 13a to 13d in the mold clamping cylinders 11a to 11d are moved in the mold opening direction to separate the mold 3 and the mold 7.

Further, after the engagement with the tie bar 15 is released by opening the half nut 29, the internal piston 18 of the movable cylinder 17 is moved at a high speed to move the movable rod 20.
Is extended to separate the movable mold 7 from the fixed mold 3 and a molded product is taken out (step B12). Here, the number of molded articles produced is counted (step B13), and when the number of molded articles reaches the planned production number (see the YES route of step B13), the injection compression molding machine is stopped as production ends (step B14), and the production is started. If the number is less than the predetermined number (see the NO route in step B13), the process returns to step B1, and the processing in steps B1 to B12 is performed again to perform molding.

In the above embodiment, the mold clamping cylinder 1
Although the case where the hydraulic pressure sensor 63 is provided in 1a has been described, the invention is not limited to this.
Regardless of the mold clamping cylinders 11b to 11d other than 1a, even when the hydraulic pressure sensor 63 is provided in any one of the mold clamping cylinders, mold clamping can be performed in the same manner as described above.

As described above, according to the mold clamping control device and the mold clamping control method of the injection compression molding machine according to the second embodiment of the present invention, the same operation and effect as those of the first embodiment can be obtained. Of the mold clamping cylinders 11a to 11d, it is only necessary to provide the oil pressure sensor 63 only in any one of the mold clamping cylinders 11, so that the number of hydraulic sensors installed can be reduced, thereby reducing the number of components of the apparatus. In addition to the above, the control circuit and the control system can be simplified, so that the manufacturing cost can be reduced and it is economical.

(C) Others In the mold clamping control device for the injection compression molding machine according to the first embodiment, a hydraulic pressure sensor is provided for detecting the oil pressure in each of the plurality of mold clamping cylinders. In the mold clamping control device of the injection compression molding machine of the second embodiment, one hydraulic pressure sensor for detecting the oil pressure to one of the mold clamping cylinders is provided, but the invention is not limited to this.
It may be configured to include a plurality of oil pressure sensors that respectively detect oil pressure to two or more mold clamping cylinders among the plurality of mold clamping cylinders.

That is, in the case of having four mold clamping cylinders as in each of the above embodiments, two or three oil pressure sensors for detecting the oil pressure to two or three mold clamping cylinders among them are provided. Make up. Other parts are configured substantially the same as the mold clamping control device of the injection compression molding machine of each of the above embodiments. With this configuration, after injecting the molten resin into the mold cavity, each mold clamping pressure detected by each oil pressure sensor at the time of mold clamping is compared with a set value, and two or more oil pressure sensors are provided. 3
A switching instruction from the position control or the speed control to the pressure control is issued to the control device for the clamping cylinder of the one of the two clamping cylinders which first reaches the set pressure.

In this case as well, the molten resin injected into the mold cavity is biased toward one side of the plurality of mold clamping cylinders, and the mold clamping pressure of the mold clamping cylinder on that side increases. The error of the clamping pressure between the clamping cylinders is slight, and the parallel movement control of the clamping can be performed without any problem in practical use. Hereinafter, in the same manner as the above-described mold clamping control device of the injection compression molding machine of the first embodiment, the control device for the mold clamping cylinder, which first reaches the set pressure in the control device, from this moment on, turns to the mold clamping cylinder. The pressure control is performed for the other clamping cylinders, and the other clamping cylinder control devices are controlled by the other clamping cylinder cylinders. The parallel control (position control for maintaining the parallelism) of the movable mold board is performed by performing the above-mentioned operations.

With this arrangement, the same operation and effect as those of the first embodiment can be obtained. In addition, as in the first embodiment, a hydraulic pressure sensor is provided for each mold clamping cylinder in the mold clamping control device of the injection compression molding machine. Even without the need for a hydraulic pressure sensor, mold clamping control can be performed using a smaller number of hydraulic sensors than the number of hydraulic sensors, so that the number of components of the apparatus can be reduced, and control circuits and control Since the system can be simplified, the manufacturing cost can be reduced and it is economical. or,
As compared with the mold clamping control device according to the second embodiment, which has one pressure sensor for detecting the working fluid pressure to one mold clamping cylinder among the mold clamping cylinders, the molten resin has an asymmetric shape. In the case of molding into a molded product having the same, the relative inclination of the mold can be reliably prevented, and a high-quality product can be manufactured.

The present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the present invention. For example, in the above-described embodiment, the mold clamping control device of the injection compression molding machine is described. However, the present invention is not limited to this, and may be used as a mold clamping control device of a compression molding machine of a method other than injection. Can be

In the above embodiment, the moving cylinder 1
7 to control the position sensor 41 and the scale 4
3 is transmitted to the control devices 75 and 75 ', and the central control device 16 of the control devices 75 and 75'
At 9, 169 ', the moving cylinder 17 is stopped by issuing an instruction to the moving cylinder control device 72 based on the result of comparing the detected position information with a predetermined position control reference value. Instead, for example, a stop position may be set on the scale 43, and the position sensor 41 may stop the moving cylinder 17 at the same time as detecting the stop position set on the scale 43,
This can also be implemented with various modifications without departing from the spirit of the present invention.

In the above embodiment, as the functions of the control device 75, the control devices 171a to 171d for clamping cylinders are provided for each clamping cylinder, and the central control devices 169 and 169 'are provided. Control device 1
71a to 171d respectively control the respective electromagnetic servo valves 61a to 61d based on the control by the central control devices 169 and 169 '. However, the present invention is not limited thereto, and the central control devices 169 and 169' are not limited thereto. Is directly
Each electromagnetic servo valve 61a may be controlled, and this can be variously modified and implemented without departing from the spirit of the present invention.

[0126]

As described above in detail, according to the mold clamping control device for a compression molding machine of the present invention, a fixed working fluid pressure source for supplying a working fluid of a constant pressure is provided, and a molded product is formed by clamping. During compression molding, by performing pressure control and speed / position control on a plurality of mold clamping cylinders in cooperation based on the detection results of the position detection means and the fluid pressure detection means,
Control means for controlling the servo valve mechanism is provided so as to move at least one of the pair of dies in parallel, so that the inlet pressure at the servo valve is kept constant during mold clamping. The response gain of the feedback control in the characteristics (opening-flow rate characteristics) of the servo valve when performing parallel control (speed and position control) of the mold clamping cylinder can be selected in the optimum range, and stable compression molding can be achieved. There is an advantage that it is possible, there is no reduction in compression speed due to the override characteristic, and there is an advantage that the repetition and stability of the mold clamping pressure can be improved and productivity can be improved. Since the control response of the mold clamping pressure does not decrease even at the time of mold clamping with mold clamping pressure, stability is improved and compression molding can be performed safely. It is possible to improve productivity with (claim 1).

Further, there is an advantage that an expensive pressure reducing valve with an electromagnetic pilot is not required, and a mold clamping control device of a compression molding machine can be manufactured at low cost and is economical. Further, as the fluid pressure detecting means, a device having a plurality of pressure sensors for detecting working fluid pressures to a plurality of mold clamping cylinders can be used. In this case, the inclination of the mold at the time of mold clamping can be improved. Can be reliably prevented, the compression molding can be performed safely, and a high-quality product can be manufactured (claim 2).

Further, as the fluid pressure detecting means, a means provided with a plurality of pressure sensors for respectively detecting the working fluid pressure to two or more of the plurality of mold clamping cylinders can be used. In addition to reducing the number of component parts of the device, the control circuit and control system can be simplified, so that manufacturing costs can be reduced and economical. Thus, compression molding can be performed safely, and a high-quality product can be manufactured (claim 3).

Further, as the fluid pressure detecting means, one provided with one pressure sensor for detecting the working fluid pressure to one of the plurality of mold clamping cylinders can be used. If this is done, the number of components of the apparatus can be reduced, and the control circuit and control system can be simplified, so that the manufacturing cost can be reduced and it is economical.

Further, at the time of pressure control by the pressure control means, priority is given to control by the first speed / position control means,
A second method for controlling the speed and position of another mold clamping cylinder other than the particular mold clamping cylinder by following the particular mold clamping cylinder.
Since it can be configured with speed / position control means, it is possible to reliably prevent the mold from tilting during mold clamping, to perform compression molding safely, and to manufacture high-quality products. (Claim 5).

Further, according to the mold clamping control method for a compression molding machine of the present invention, a plurality of mold clamping cylinders can be controlled based on the movable part position detection results and the speed / position control reference values. After performing the speed / position control, in a state where the speed / position control is performed, the working fluid pressure to any one of the at least one of the plurality of clamping cylinders is reduced. When the predetermined value is reached, the pressure control is applied to a specific mold clamping cylinder to which the working fluid pressure having the predetermined value is supplied in preference to the speed / position control, and other than the specific mold clamping cylinder. For the mold clamping cylinder, since the speed and position control following the specific mold clamping cylinder is continued, it is possible to reliably prevent the mold from tilting during mold clamping and to safely perform compression molding. Can Together, there is an advantage that it is possible to manufacture high-quality products (claim 6)

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a mold clamping control device of an injection compression molding machine as a first embodiment of the present invention, and also showing a control system thereof.

FIG. 2 is a longitudinal sectional view schematically showing a structure of a part of a mold clamping control device of the injection compression molding machine according to the first embodiment of the present invention, which is partially broken.

FIG. 3 is a functional block diagram showing a configuration of a control system of a mold clamping control device of the injection compression molding machine as the first embodiment of the present invention.

FIG. 4 is a flowchart for explaining a control procedure in the mold clamping control device of the injection compression molding machine as the first embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of a mold clamping control device of an injection compression molding machine according to a second embodiment of the present invention, and also showing a control system thereof.

FIG. 6 is a longitudinal sectional view schematically showing a structure of a part of a mold clamping control device of an injection compression molding machine according to a second embodiment of the present invention, which is partially broken.

FIG. 7 is a flowchart illustrating a control procedure in a mold clamping control device of an injection compression molding machine according to a second embodiment of the present invention.

FIG. 8 is a view for explaining a mold clamping control device of a conventional mold clamping control device of a compression molding machine.

FIG. 9 is a longitudinal sectional view schematically showing a configuration of a mold clamping control device of a conventional mold compression control device of an injection compression molding machine.

[Explanation of symbols]

Reference Signs List 3 fixed mold 5 fixed mold board 7 movable mold 9 movable mold board 11, 11a to 11d mold clamping cylinder 13, 13a to 13d ram 15, 15a to 15d tie bar 169, 169 'central control unit 171a to 171d for mold clamping cylinder Control devices 55a to 55d Position sensors (position detection means) 57a to 57d Scales (position detection means) 60 Servo valve mechanisms 61a to 61d Electromagnetic servo valves 63, 63a to 63d Hydraulic sensors (fluid pressure detection means) 75, 75 'Control devices (Control means) 80 Constant working fluid pressure source 91, 91 'First speed / position control device (first speed / position control means) 92, 92' Pressure control device (pressure control means) 93, 93 'Second speed / position control device Position control device (first speed / position control means) 94, 94 'High-speed movement control device

Claims (6)

[Claims] In a compression molding machine for accommodating a plasticized molding material between a pair of relatively movable molds and compressing and molding with a plurality of clamping cylinders, a constant operation for supplying a working fluid at a constant pressure. A fluid pressure source, and a servo valve mechanism for receiving a working fluid from the constant working fluid pressure source and adjusting a moving speed of a movable portion in the plurality of mold clamping cylinders and a working fluid pressure supplied to the plurality of mold clamping cylinders. Position detecting means for detecting a movable portion position in the plurality of mold clamping cylinders; and fluid pressure detection for detecting a working fluid pressure at the time of mold clamping to at least one of the plurality of mold clamping cylinders. And pressure control and speed / position control for the plurality of mold clamping cylinders based on the detection results obtained by the position detecting means and the fluid pressure detecting means during the compression molding of the molded article by the mold clamping. Compression molding, characterized by comprising control means for controlling the servo valve mechanism so as to move at least one of the pair of dies in parallel. Machine clamping control device. 2. The fluid pressure detecting means according to claim 1, wherein said fluid pressure detecting means comprises a plurality of pressure sensors for respectively detecting a working fluid pressure to said plurality of mold clamping cylinders.
A mold clamping control device for the compression molding machine as described in the above. 3. The fluid pressure detecting means is provided with a plurality of pressure sensors for detecting a working fluid pressure to two or more mold clamping cylinders of the plurality of mold clamping cylinders, respectively. The clamping control device for a compression molding machine according to claim 1. 4. The method according to claim 1, wherein the fluid pressure detecting means includes one pressure sensor for detecting a working fluid pressure to one of the plurality of mold clamping cylinders. A mold clamping control device for a compression molding machine according to claim 1. 5. A first speed / position for performing speed / position control on the plurality of mold clamping cylinders based on a result detected by the position detection means and a speed / position control reference value. Control means; and during the control by the first speed / position control means, the fluid pressure detection means detects at least one of the plurality of mold clamping cylinders.
When the working fluid pressure at the time of mold clamping on any one of the mold clamping cylinders reaches a predetermined value, the working fluid pressure at which the predetermined value has been reached is given priority over the control by the first speed / position control means. Pressure control means for performing pressure control on a specific mold clamping cylinder supplied with the pressure control means, and at the time of pressure control by the pressure control means, prior to control by the first speed / position control means, 2. The apparatus according to claim 1, further comprising second speed / position control means for performing speed / position control on the other mold clamping cylinders other than the clamping cylinder in accordance with the specific mold clamping cylinder.
A mold clamping control device for the compression molding machine as described in the above. 6. When performing mold clamping control on a compression molding machine that stores a plasticized molding material between a pair of relatively movable molds and performs compression molding using a plurality of mold clamping cylinders, The speed / position control is performed on the plurality of mold clamping cylinders based on the movable part position detection result of the mold clamping cylinder and the reference value for speed / position control, and then the speed / position control is performed. When the working fluid pressure to any one of at least one of the plurality of mold clamping cylinders reaches a predetermined value, the predetermined value is given priority over the speed / position control. Pressure control is performed on the specific mold clamping cylinder to which the working fluid pressure is supplied, and for the other mold clamp cylinders other than the specific mold clamp cylinder, the specific mold clamp cylinder is The speed that followed Characterized in that to continue the location control, mold clamping control method of a compression molding machine.