JP2019195976A - Injection molding machine and method for setting mold thickness of injection molding machine - Google Patents

Abstract

To provide an injection molding machine and a method for setting a mold thickness of an injection molding machine preventing damage to a mold or the injection molding machine even when a human error occurs in a setting-input of the mold thickness in the injection molding machine that sets the mold thickness using a mold thickness being setting-inputted.SOLUTION: In an injection molding machine 11 that sets the mold thickness using a mold thickness being inputted, the mold thickness is set using a measured mold thickness A and the setting-inputted mold thickness B. An abnormal value is determined when the setting-inputted mold thickness B deviates from the measured mold thickness A by a predetermined value or more.SELECTED DRAWING: Figure 2

Description

The present invention relates to an injection molding machine that performs mold thickness setting using a mold thickness that has been set and input, and a mold thickness setting method for an injection molding machine.

In the injection molding machine, it is necessary to set the mold thickness each time the mold is replaced. In this regard, Patent Document 1 describes that the operator sets the mold thickness by inputting the mold thickness in the mold thickness setting field b21. Patent Document 2 describes that the mold thickness is measured and input as mold thickness data, and an allowable value (reference value A) ± 0.3 mm is given. During molding, the actual measured value of the mold is compared with the previous measured value, and if the error is within the allowable value, the process proceeds to the next operation, and if the error exceeds the allowable value, the mold thickness It is described that the operation of the machine is stopped when the reference value A is exceeded as compared with an allowable value (reference value A) given at the time of setting.

Patent Document 3 describes that the mold thickness dimension measured and stored prior to the operation control is corrected based on the position of the movable mold detected by the mold position detecting means after completion of mold clamping at the time of molding. Yes. Therefore, in these patent documents 2 and patent documents 3, an injection molding machine can be operated corresponding to thermal expansion of a metallic mold at the time of molding.

Furthermore, Patent Document 4 describes that a correction value (offset value) of a mold thickness dimension of a molding die is stored in advance in an injection molding machine, and correction is performed on the measured mold thickness dimension. Yes. Therefore, in patent document 4, it can correct | amend automatically with respect to the measured mold thickness dimension of each metal mold | die, such as a spring metal mold | die.

JP 2010-76431 A (0061, FIG. 3) Japanese Utility Model Publication No. 5-41864 (Scope of request for utility model registration, page 2, column 4) JP-A-7-148740 (Claims 1, 0014 to 0018) JP 2017-87526 A (Claims 1, 0020 to 0023)

However, Patent Document 1 does not clearly indicate on what basis the operator inputs the mold thickness. Therefore, the optimum mold thickness for molding using the attached mold is not always inputted. In addition, Patent Document 2 describes that “the mold thickness is measured and input as mold thickness data”, but it is unclear whether the operator inputs the setting. Patent Documents 2 to 3 describe that the mold thickness is corrected by control during molding, and Patent Document 4 describes that the mold thickness is corrected according to the mold structure. There are various mold structures and mold temperatures, and it may be difficult to optimally set correction values for all mold thicknesses in advance.

Therefore, it is convenient for the injection molding machine to allow the operator to freely set and input the mold thickness by referring to the actually measured mold thickness, which can be optimally handled for a wide variety of mold structures and mold temperatures. is there. However, if the operator can freely set and input the mold thickness, an artificial input error may occur. If the mold thickness setting input value is entered incorrectly by mistake due to human error, the molds may collide with each other due to the mold closing operation of the mold opening / closing mechanism, resulting in damage to the mold or the injection molding machine. There was.

In the present invention, in an injection molding machine that performs mold thickness setting using a mold thickness that has been set and input in view of the above problems, even if there is a human error in setting the mold thickness, a mold or injection molding An object of the present invention is to provide an injection molding machine and a mold thickness setting method for the injection molding machine that do not damage the machine.

An injection molding machine according to claim 1 of the present invention is an injection molding machine that performs mold thickness setting using a set input mold thickness, and a mold thickness using an actually measured mold thickness and a set input mold thickness. When performing the setting, it is determined that an abnormal value is determined when the mold thickness set and input deviates from a measured mold thickness by a certain amount or more.

An injection molding machine according to claim 2 of the present invention is an injection molding machine that performs mold thickness setting using a mold thickness that has been set and input, and a measuring means that measures the mold thickness, and a setting input that sets and inputs the mold thickness. Means for determining whether the measured mold thickness can be replaced with the set input mold thickness by comparing the actually measured mold thickness with the set input mold thickness, and the measured mold thickness and The mold thickness is set using the mold thickness inputted and set.

According to a third aspect of the present invention, in the molding machine according to the first or second aspect, the actually measured mold thickness is displayed on the setting display screen of the setting input means, and is determined by the mold thickness set and input from the setting input means. It is characterized by being replaced.

The mold thickness setting method for an injection molding machine according to claim 4 of the present invention is the mold thickness setting method for an injection molding machine in which the mold thickness is set using the set input mold thickness. The measured mold thickness is displayed on the setting display screen of the setting input means and stored in the control device. When the mold thickness is manually input from the setting input means, the measured thickness is actually measured. Is determined as an abnormal value when the mold thickness manually set and input from the setting input means deviates more than a certain value from the mold thickness stored in the table.

In the injection molding machine of the present invention, in the injection molding machine that performs mold thickness setting using the mold thickness that has been set and input, when performing mold thickness setting by using the actually measured mold thickness and the mold thickness that has been set and input, Since the abnormal value is determined when the mold thickness set and input is deviated from the measured mold thickness by a certain amount or more, even if there is a mistake in the setting input, the mold or injection molding machine may be damaged. There is no.

It is explanatory drawing which shows the injection molding machine of this embodiment, and its metal mold | die exchange. It is a flowchart figure which shows the mold thickness setting method of the injection molding machine of this embodiment.

First, the schematic structure of the injection molding machine 11 of the present invention will be described with reference to FIG. The injection molding machine 11 includes an injection device 13 and a mold clamping device 14 on a bed 12. The mold clamping device 14 moves a movable plate 18 to which the movable mold 17 is attached to a fixed plate 16 to which the fixed die 15 is attached by a mold opening / closing mechanism 19 and performs mold clamping by the mold clamping mechanism 20. . Clamping cylinders 21 of the clamping mechanism 20 are provided in the vicinity of the four corners of the fixed plate 16 fixed on the bed 12, and tie bars 22, which are rods of the clamping cylinder 21, are inserted into bushes near the four corners of the movable platen 18. ing. The mold opening / closing mechanism 19 is provided between the bed 12 and the movable platen 18. In FIG. 1, the mold opening / closing mechanism 19, the mold clamping mechanism 20, and the tie bar 22 are omitted and only one is shown, but it goes without saying that the necessary numbers are provided.

Near the lower portions of the mold mounting surfaces 16a and 18a of the fixed plate 16 and the movable platen 18, rollers 24 and 25 for moving the molding die 23 composed of the fixed die 15 and the movable die 17 in the horizontal direction are respectively attached. ing. A position sensor 26 (measuring means for measuring the mold thickness) such as a linear sensor is provided by connecting the fixed plate 16 and the movable plate 18 so that the position of the movable plate 18 relative to the fixed plate 16 can be detected. The detection of the position of the movable platen 18 (measuring means for measuring the mold thickness) can also be detected by the encoder of the servomotor 27 when the mold opening / closing mechanism 19 uses the servomotor 27. The position sensor 26 that detects the position of the board 18 may not be provided. The structure of the mold clamping device 14 is not limited to that described above, and a mold clamping mechanism may be provided on the back side of the movable platen 18. Further, the functions of the mold opening / closing mechanism 19 and the mold clamping mechanism 20 may be performed by a toggle mechanism.

These mold opening / closing mechanism 19, mold clamping mechanism 20, position sensor 26 and the like are connected to a control device 29 (not shown). For the control device 29, only the relevant parts of the present invention are described functionally briefly. The control device 29 includes an input / output unit 30 to which a signal is input, a storage unit 31 in which data such as a mold thickness is stored, a determination unit 32 (determination unit) that performs determination of a set mold thickness B, which will be described later, and the like. Further, a setting input device 34 (setting input means) having a setting display screen 33 is provided on the operation side surface of the fixed platen 16. The setting input device 34 is also connected to the input / output unit 30 of the control device 29 with a signal line 28. Connected through.

In the present embodiment, a mold exchanging mechanism 35 for carrying the mold 23 into and out of the injection molding machine 11 in the horizontal direction is provided. The mold exchanging mechanism 35 includes a mold exchanging carriage 37 that moves on a rail 36 provided between the vicinity of a mold mounting shelf (not shown) and the vicinity of the injection molding machine 11. The mold exchanging cart 37 includes a moving table 39 with a roller 38 that moves on the cart. The movement of the molding die 23 placed on the moving base 39 of the die exchanging carriage 37 may be performed by power or by human power. An interlock mechanism such as a proximity switch and a limit switch (not shown) for confirming the positions and fixed states of the mold exchanging carriage 37 and the molding mold 23 is attached to the mold exchanging carriage 37 and the injection molding machine 11.

Next, the replacement of the molding die 23 and the mold thickness setting method of the injection molding machine 11 will be described with reference to the flowchart of FIG. When the previous molding is completed, the molding die is removed from the injection molding machine 11, placed on the die changing carriage 37, and moved to the die mounting shelf. Then, a mold exchanging carriage 37 on which another molding mold 23 is placed is stopped and fixed to the side of the injection molding machine 11. At this time, as shown in FIG. 1, the movable platen 18 of the injection molding machine 11 stops at a position where the distance L between the fixed platen 16 and the movable platen 18 is slightly larger than the mold thickness W of the molding die 23. Has been. Then, the molding die 23 is fed from the moving base 39 of the die exchanging carriage 37 onto the roller 24 of the stationary platen 16 and the roller 25 of the movable platen 18 of the injection molding machine 11.

Next, mold thickness setting work including attachment of the molding die 23 is performed. In the mold thickness setting work, the operator operates the setting input device 34 to activate the mold opening / closing mechanism 19 and advance the movable platen 18 toward the fixed platen 16. At this time, the movable platen 18 may be moved forward by the button operation in the automatic mold thickness setting mode on the setting display screen 33 of the setting input device 34, or the movable platen 18 is moved forward manually by the mold closing button (switch) operation. May be. Of the molding dies 23, the mounting surface 15 a of the stationary mold 15 is completely brought into close contact with the mold mounting surface 16 a of the stationary platen 16, and the mounting surface 17 a of the movable mold 17 is mold-mounted surface 18 a of the movable platen 18. When completely in close contact, the molding die 23 is attached to the injection molding machine 11. In the present embodiment, the molding die 23 is attached by fixing the fixed die 15 to the die attaching surface 16a of the fixed platen 16 and the movable die 17 from the die attaching surface 18a of the movable platen 18 by a clamping device (not shown). Fixed to. The method of attaching the molding die 23 to the fixed platen 16 or the movable platen 18 may be a method of attaching the molding die 23 with a magnet, or a method of attaching the molding die 23 with a bolt by an operator. Further, at least a part of the work of attaching the molding die 23 to the fixed platen 16 or the movable platen 18 may be performed after setting the mold thickness to be described later.

In the automatic mold thickness setting mode, the mold clamping mechanism 20 is automatically operated and mold clamping control is started. When the operator manually operates, the mold clamping button (switch) on the setting display screen 33 is operated to activate the mold clamping mechanism 20 and start mold clamping control (s1). In any method, when the mold clamping mechanism 20 is actuated to increase the hydraulic pressure of the mold clamping cylinder 21 to a predetermined pressure (or when a predetermined mold clamping force is detected), it is determined that the mold clamping is completed (s2 = Y). The mold thickness at that time (when the mold is clamped) is actually measured (sampled) by the measuring means such as the position sensor 26 (s3). Then, the actually measured (sampled) measured thickness A is stored in the storage unit 31 of the control device 29 (s4). The measured mold thickness A is displayed in the mold thickness display window of the setting display screen 33 of the setting input device 34 (s5).

Next, the operator manually inputs the setting die thickness B from the setting display screen 33 while referring to the actually measured die thickness A displayed on the setting display screen 33 (s6). Setting of the set die thickness B by manual input allows the operator to set and input an optimum value in consideration of the die structure of the molding die 23, the die temperature, and the like. Specifically, when setting the mold thickness B which is a value obtained by correcting the measured mold thickness A in anticipation of the thermal expansion of the mold, or when using a special mold such as a spring mold or a compression mold, the measured mold When the optimum molding cannot be performed with the thickness A, the set die thickness B having a value obtained by correcting the measured die thickness A is input.

The numerical value of the set mold thickness B by manual input is obtained by inputting the value of the actually measured mold thickness A displayed in the mold thickness display window by inputting from a numeric keypad (not shown) which is a part of the setting input means or by directly inputting to the setting display screen 33. This is done by overwriting the numerical value. At that time, the manually input set mold thickness B is sent to the determination unit 32 of the control device 29 which is a determination means, and it is compared / determined whether it deviates from the stored measured mold thickness A by a certain amount or more. (S7). (That is, it is determined whether or not the measured mold thickness A can be replaced with the set mold thickness B.) When the set mold thickness B is not deviated from the measured mold thickness A by a certain amount (s7 = Y), Assuming that the set mold thickness B is a normal value, the set mold thickness B is replaced with the actually measured mold thickness A (s8) and stored in the storage unit 31 of the control device 29 (s9). In this embodiment, the deviation determination of the set mold thickness B with respect to the actually measured mold thickness A is determined based on the absolute value deviation quantity between the plus side and the minus side. In subsequent molding, mold opening / closing control (including mold clamping control) is performed based on the manually set mold thickness B.

If the set die thickness B by manual input deviates from the measured die thickness A by a certain amount (s7 = N), the set die thickness B is an abnormal value and a message is displayed on the setting display screen 33. Display or issue an alarm with an alarm sound (s10). Then, the worker who notices the alarm notices that an abnormal value deviating from the measured mold thickness A by a certain amount or more is input, and the corrected set mold thickness B is re-input (s11). If there is a re-input of the corrected set mold thickness B (s11 = Y), the corrected mold thickness B is sent to the control device 29 again, and whether or not the measured mold thickness A deviates more than a certain amount. Are compared and judged. Further, if the mold thickness B corrected in (s11) is not re-input (s11 = N), the mold thickness adjustment operation ends abnormally and cannot be shifted to molding.

Therefore, due to an operator's misunderstanding or pressing mistake, a remarkable abnormal value is set and input to the control device 29 as the set die thickness B by manual input, and the machine is operated based on the abnormal value, and the molding die 23 and the injection molding machine 11 are damaged. Never give. In the present invention, the actual mold thickness W of the molding die 23 is measured by the operator, and when setting the mold thickness, a numerical value slightly larger than the dimension measured by the scale is input to form the molding die. The mold thickness can be set quickly and reliably compared to the conventional method of fine adjustment while moving and closing the mold.

When setting input of the set mold thickness B by manual input is performed, mold opening / closing control (including mold clamping control) using the set mold thickness B is basically performed at the time of molding. When the continuous molding is completed and the mold replacement mode is set, the set mold thickness B stored in the storage unit 31 of the control device 29 is reset. The reset of the set die thickness B may be performed when the clamping of the molding die 23 is released.

As a first modification of the above-described embodiment of the present invention, an abnormal value is obtained when the mold thickness (set mold thickness B) set and inputted with respect to the actually measured mold thickness (measured mold thickness A) exceeds a certain value. It may be determined. Since “determined as an abnormal value when exceeding a certain value” and “determined as an abnormal value when the deviation exceeds a certain value” are substantially the same purpose control from the purpose, the former is also the present invention. Within the scope of rights. It is also within the scope of the right of the present invention to determine a normal value when the mold thickness (set mold thickness B) set and inputted with respect to the measured mold thickness (actual mold thickness A) is within a certain range. is there.

As a second modification of the above-described embodiment of the present invention, the timing for actually measuring the mold thickness of the molding die is not limited to the completion of mold clamping (during mold clamping), but is detected by detecting the hydraulic value, motor torque, or the like. The mold thickness may be measured when the mold is closed. In the electric toggle mold clamping device, the mold torque is actually measured by sensing the motor torque when the mold is closed, but the value of the mold torque corresponding to the value of the mold torque is arbitrarily determined.

As a third modification of the above-described embodiment of the present invention, the comparison between the actually measured mold thickness and the set and input mold thickness performed thereafter is performed by a difference based on an absolute value (plus or minus) as in the above-described embodiment. It doesn't have to be a thing. Depending on the structure of the injection molding machine 11, when the set mold thickness B is set and input with a dimension that is too small, the molds collide with each other. However, when a dimension that is too large is input, the mold is only closed without completing the mold closing. It may stay. Therefore, the threshold value for determining that the set mold thickness B is abnormal with respect to the measured mold thickness A may be a threshold value on the minus side that is smaller than that on the plus side. Alternatively, a positive threshold value may not be provided for the set mold thickness B, and an abnormality may be determined only when the negative threshold value is exceeded.

As a fourth modification of the above-described embodiment of the present invention, the measured mold thickness measured at the time of the last mold mounting is set by performing setting input such as the mold number of the molded mold replaced when the mold is replaced. It may be displayed on the display screen 33 and temporarily stored in the storage unit 31 of the control device 29 for comparison with the set input value of the mold thickness. Alternatively, information such as an actually measured mold thickness of the molding die exchanged together with the die exchange may be transmitted to the injection molding machine by communication. In these cases, the measured mold thickness A is displayed on the setting display screen 33 of the injection molding machine 11 together with the mounting of the molding die 23, and the operator can correct the measured mold thickness A by manual input. Then, when a value deviating from the measured mold thickness A by a certain amount or more is input, it may be determined as abnormal.

As a fifth modification of the above-described embodiment of the present invention, at least part of the replacement from the measured mold thickness A to the set mold thickness B when the set mold thickness B is a normal value may be performed. Specifically, the measured thickness A is stored in the storage unit 31 of the control device 29 even after the replacement. The mold opening / closing control is performed by the set mold thickness B at the time of molding, but the measured mold thickness A may be used for the purpose of comparison / monitoring with an abnormal value. The measured mold thickness A is stored as data of the molding die 23 and for the purpose of storing molding data. Also, the display on the setting display screen 33 may be displayed together with the value of the set die thickness B without deleting the value of the actually measured die thickness A.

As a sixth modification of the above-described embodiment of the present invention, the manually input set mold thickness B may be used as a control value for the initial cycle (or initial stage) of the mold opening / closing control. That is, in the initial cycle (or initial stage) of mold opening / closing control, mold opening / closing control is performed with the set mold thickness B. However, as shown in Patent Document 3, a mold is formed each time the number of moldings is repeated with respect to the set mold thickness B. The mold thickness may be automatically corrected by the thermal expansion of the mold and the mold opening / closing control may be performed based on the corrected mold thickness value.

As a seventh modification of the above-described embodiment of the present invention, the molding die 23 may be carried in between the upper tie bars 22 and 22 of the injection molding machine 11 using a crane. In that case, the mold thickness may be set while the molding die 23 is suspended from the crane, or the mold thickness may be adjusted by removing the crane after the molding die 23 is attached to the injection molding machine 11. Good.

The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and those skilled in the art have made modifications based on the gist of the present invention, and also a combination of the above-described embodiments. It goes without saying that it applies. The molding machine may be an injection molding machine for die casting containing a light metal such as magnesium in addition to an injection molding machine for resin molding (which may include fibers and the like in addition to resin). The injection molding machine is not limited to the one in which the movable plate and the movable mold are moved in the horizontal direction, and the movable plate and the movable mold may be moved in the vertical direction.

11 Injection molding machine
13 Injection device 14 Clamping device 15 Fixed mold 16 Fixed platen 19 Mold opening / closing mechanism 20 Clamping mechanism 23 Molding mold 26 Position sensor (measuring means)
29 Control device (determination means)
33 Setting display screen 34 Setting display device (setting input means)
A Actual mold thickness (actual mold thickness)
B Set mold thickness (Set mold thickness entered)
W type thickness

Claims (4)

In the injection molding machine that performs mold thickness setting using the set mold thickness,
When setting the mold thickness using the measured mold thickness and the entered mold thickness,
An injection molding machine characterized in that an abnormal value is determined when a mold thickness set and inputted with respect to an actually measured mold thickness deviates more than a certain value. In the injection molding machine that performs mold thickness setting using the set mold thickness,
A measuring means for actually measuring the mold thickness;
A setting input means for setting and inputting the mold thickness;
Determining means for comparing the measured mold thickness with the set input mold thickness to determine whether the measured mold thickness can be replaced with the set input mold thickness;
An injection molding machine that performs mold thickness setting using an actually measured mold thickness and a set input mold thickness. 3. The injection molding machine according to claim 1, wherein the actually measured mold thickness is displayed on a setting display screen of the setting input means, and is replaced by the mold thickness set and inputted from the setting input means. In the mold thickness setting method of an injection molding machine that performs mold thickness setting using the set mold thickness,
Measure the mold thickness when the mold is closed or clamped,
The measured mold thickness is displayed on the setting display screen of the setting input means and stored in the control device,
When manually inputting the mold thickness from the setting input means,
A mold for an injection molding machine characterized in that an abnormal value is determined when a mold thickness manually set and input from the setting input means deviates more than a certain value from a mold thickness actually measured and stored in a control device. Thickness setting method.