JP2022157892A - movable platen - Google Patents

Abstract

To provide a movable platen that improves workability.SOLUTION: A movable platen has a platen body, and a pair of legs connected to the platen body and connected to a slider on an underside. One of the legs has a positioning part protruding downward on its lower surface for positioning the slider in a steering direction, and the other leg has a protruding part protruding on its lower surface to the same position as the lower surface of the positioning part.SELECTED DRAWING: Figure 3

Description

The present invention relates to a movable platen of a mold clamping device.

2. Description of the Related Art There is known an injection molding machine equipped with a mold clamping device that moves a movable platen.

JP-A-2001-121593

By the way, there is a demand for improved workability during assembly and maintenance of the mold clamping device.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a movable platen that improves workability.

A movable platen according to one aspect of an embodiment includes a platen main body and a pair of legs connected to the platen main body and having a lower surface connected to a slider. It has a positioning portion that protrudes downward for positioning in the opposite direction, and the other leg has a protruding portion on the lower surface that protrudes to the same position as the lower surface of the positioning portion.

ADVANTAGE OF THE INVENTION According to this invention, the movable platen which improves workability can be provided.

It is a figure which shows the state at the time of completion of mold opening of the injection molding machine which concerns on one Embodiment. It is a figure which shows the state at the time of mold clamping of the injection molding machine which concerns on one Embodiment. It is a front view of a movable platen. FIG. 4 is a side view of the movable platen; FIG. 4 is an enlarged view of one leg of the movable platen; FIG. 11 is an enlarged view of the other leg of the movable platen;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each drawing, the same or corresponding configurations are denoted by the same or corresponding reference numerals, and descriptions thereof are omitted.

<Injection molding machine 1>
First, the injection molding machine 1 will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a diagram showing a state of an injection molding machine according to one embodiment when mold opening is completed. FIG. 2 is a diagram showing a state of the injection molding machine according to the embodiment at the time of mold clamping. In this specification, the X-axis direction, Y-axis direction and Z-axis direction are directions perpendicular to each other. The X-axis direction and Y-axis direction represent the horizontal direction, and the Z-axis direction represents the vertical direction. When the mold clamping device 100 is of a horizontal type, the X-axis direction is the mold opening/closing direction, and the Y-axis direction is the width direction of the injection molding machine 1 . The Y-axis direction negative side is called the operating side, and the Y-axis direction positive side is called the non-operating side.

As shown in FIGS. 1 and 2, the injection molding machine 1 includes a mold clamping device 100 that opens and closes a mold device 800, an ejector device 200 that ejects a molded product molded by the mold device 800, and the mold device 800. a moving device 400 for moving the injection device 300 forward and backward with respect to the mold device 800; a control device 700 for controlling each component of the injection molding machine 1; and a frame 900 that supports the components. The frame 900 includes a mold clamping device frame 910 that supports the mold clamping device 100 and an injection device frame 920 that supports the injection device 300 . The mold clamping device frame 910 and the injection device frame 920 are each installed on the floor 2 via leveling adjusters 930 . A control device 700 is arranged in the inner space of the injection device frame 920 . Each component of the injection molding machine 1 will be described below.

(mold clamping device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (for example, the X-axis positive direction) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened is defined as the rear (for example, the X-axis negative direction). do.

The mold clamping device 100 performs mold closing, pressure increase, mold clamping, depressurization, and mold opening of the mold device 800 . Mold apparatus 800 includes a fixed mold 810 and a movable mold 820 .

The mold clamping device 100 is of a horizontal type, for example, and the mold opening/closing direction is horizontal. The mold clamping device 100 includes a stationary platen 110 to which a stationary mold 810 is attached, a movable platen 120 to which a movable mold 820 is attached, a moving mechanism 102 that moves the movable platen 120 in the mold opening/closing direction with respect to the stationary platen 110, have

The fixed platen 110 is fixed with respect to the mold clamping device frame 910 . A stationary mold 810 is attached to the surface of the stationary platen 110 facing the movable platen 120 .

The movable platen 120 is arranged movably in the mold opening/closing direction with respect to the mold clamping device frame 910 . A guide 101 for guiding the movable platen 120 is laid on the mold clamping device frame 910 . A movable die 820 is attached to the surface of the movable platen 120 facing the fixed platen 110 .

The moving mechanism 102 moves the movable platen 120 back and forth with respect to the fixed platen 110 to perform mold closing, pressure increase, mold clamping, pressure release, and mold opening of the mold device 800 . The moving mechanism 102 includes a toggle support 130 spaced apart from the stationary platen 110 , tie bars 140 connecting the stationary platen 110 and the toggle support 130 , and moving the movable platen 120 relative to the toggle support 130 in the mold opening/closing direction. a toggle mechanism 150 that operates the toggle mechanism 150, a mold clamping motor 160 that operates the toggle mechanism 150, a motion conversion mechanism 170 that converts the rotary motion of the mold clamping motor 160 into a linear motion, and a mold that adjusts the interval between the stationary platen 110 and the toggle support 130. and a thickness adjustment mechanism 180 .

The toggle support 130 is spaced apart from the fixed platen 110 and mounted on the mold clamping device frame 910 so as to be movable in the mold opening/closing direction. In addition, the toggle support 130 may be arranged so as to be movable along a guide laid on the mold clamping device frame 910 . The guides of the toggle support 130 may be common with the guides 101 of the movable platen 120 .

In this embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle support 130 is arranged to be movable in the mold opening/closing direction with respect to the mold clamping device frame 910. Fixed to the device frame 910 , the stationary platen 110 may be arranged to be movable relative to the mold clamping device frame 910 in the mold opening/closing direction.

The tie bar 140 connects the stationary platen 110 and the toggle support 130 with a gap L in the mold opening/closing direction. A plurality of (for example, four) tie bars 140 may be used. The multiple tie bars 140 are arranged parallel to the mold opening/closing direction and extend according to the mold clamping force. At least one tie bar 140 may be provided with a tie bar strain detector 141 that detects strain of the tie bar 140 . Tie-bar distortion detector 141 sends a signal indicating the detection result to control device 700 . The detection result of the tie bar strain detector 141 is used for detection of mold clamping force and the like.

In this embodiment, the tie bar strain detector 141 is used as a mold clamping force detector that detects the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, but may be of piezoelectric type, capacitive type, hydraulic type, electromagnetic type, etc., and its mounting position is not limited to the tie bar 140 either.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle support 130 and moves the movable platen 120 relative to the toggle support 130 in the mold opening/closing direction. The toggle mechanism 150 has a crosshead 151 that moves in the mold opening/closing direction, and a pair of link groups that bend and stretch as the crosshead 151 moves. A pair of link groups each has a first link 152 and a second link 153 that are connected by a pin or the like so as to be bendable and stretchable. The first link 152 is swingably attached to the movable platen 120 with a pin or the like. The second link 153 is swingably attached to the toggle support 130 with a pin or the like. A second link 153 is attached to the crosshead 151 via a third link 154 . When the crosshead 151 advances and retreats with respect to the toggle support 130 , the first link 152 and the second link 153 bend and stretch, and the movable platen 120 advances and retreats with respect to the toggle support 130 .

The configuration of the toggle mechanism 150 is not limited to the configuration shown in FIGS. 1 and 2. FIG. For example, in FIGS. 1 and 2, the number of nodes in each link group is five, but the number may be four, and one end of the third link 154 is coupled to the node between the first link 152 and the second link 153. may be

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150 . The mold clamping motor 160 advances and retreats the crosshead 151 with respect to the toggle support 130 , thereby bending and stretching the first link 152 and the second link 153 to advance and retreat the movable platen 120 with respect to the toggle support 130 . The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulley, or the like.

The motion conversion mechanism 170 converts rotary motion of the mold clamping motor 160 into linear motion of the crosshead 151 . The motion conversion mechanism 170 includes a threaded shaft and a threaded nut that screws onto the threaded shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs a mold closing process, a pressurization process, a mold clamping process, a depressurization process, a mold opening process, and the like under the control of the control device 700 .

In the mold closing process, the mold clamping motor 160 is driven to advance the crosshead 151 to the mold closing completion position at the set movement speed, thereby advancing the movable platen 120 and bringing the movable mold 820 into contact with the fixed mold 810. . The position and moving speed of the crosshead 151 are detected using, for example, a mold clamping motor encoder 161 or the like. The mold clamping motor encoder 161 detects rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700 .

The crosshead position detector for detecting the position of the crosshead 151 and the crosshead movement speed detector for detecting the movement speed of the crosshead 151 are not limited to the mold clamping motor encoder 161, and general ones are used. can. Further, the movable platen position detector for detecting the position of the movable platen 120 and the movable platen moving speed detector for detecting the moving speed of the movable platen 120 are not limited to the mold clamping motor encoder 161, and general ones are used. can.

In the pressurization step, the mold clamping motor 160 is further driven to further advance the crosshead 151 from the mold closing completion position to the mold clamping position, thereby generating a mold clamping force.

In the mold clamping process, the mold clamping motor 160 is driven to maintain the position of the crosshead 151 at the mold clamping position. In the mold clamping process, the mold clamping force generated in the pressurizing process is maintained. In the mold clamping process, a cavity space 801 (see FIG. 2) is formed between the movable mold 820 and the fixed mold 810, and the injection device 300 fills the cavity space 801 with a liquid molding material. A molded product is obtained by solidifying the filled molding material.

The number of cavity spaces 801 may be one or plural. In the latter case, multiple moldings are obtained simultaneously. The insert material may be arranged in part of the cavity space 801 and the other part of the cavity space 801 may be filled with the molding material. A molded product in which the insert material and the molding material are integrated is obtained.

In the depressurization step, the mold clamping motor 160 is driven to retract the crosshead 151 from the mold clamping position to the mold opening start position, thereby retracting the movable platen 120 and reducing the mold clamping force. The mold opening start position and the mold closing completion position may be the same position.

In the mold opening step, the mold clamping motor 160 is driven to retract the crosshead 151 from the mold opening start position to the mold opening completion position at a set moving speed, thereby retracting the movable platen 120 and moving the movable mold 820 to the fixed metal. away from the mold 810; After that, the ejector device 200 ejects the molded product from the movable mold 820 .

The set conditions in the mold closing process, the pressurizing process, and the mold clamping process are collectively set as a series of set conditions. For example, the moving speed and position of the crosshead 151 (including the mold closing start position, the moving speed switching position, the mold closing completion position, and the mold clamping position) and the mold clamping force in the mold closing process and the pressurizing process are set as a series of setting conditions. are collectively set as The mold closing start position, the movement speed switching position, the mold closing completion position, and the mold clamping position are arranged in this order from the rear side to the front side, and represent the start point and end point of the section in which the movement speed is set. A moving speed is set for each section. The moving speed switching position may be one or plural. The moving speed switching position does not have to be set. Only one of the mold clamping position and the mold clamping force may be set.

The set conditions in the depressurization process and the mold opening process are also set in the same manner. For example, the moving speed and position of the crosshead 151 (mold opening start position, moving speed switching position, and mold opening completion position) in the depressurizing process and the mold opening process are collectively set as a series of setting conditions. The mold opening start position, the movement speed switching position, and the mold opening completion position are arranged in this order from the front side to the rear side, and represent the start point and end point of the section for which the movement speed is set. A moving speed is set for each section. The moving speed switching position may be one or plural. The moving speed switching position does not have to be set. The mold opening start position and the mold closing completion position may be the same position. Also, the mold opening completion position and the mold closing start position may be the same position.

Incidentally, instead of the moving speed and position of the crosshead 151, the moving speed and position of the movable platen 120 may be set. Also, the mold clamping force may be set instead of the position of the crosshead (for example, mold clamping position) or the position of the movable platen.

By the way, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120 . The amplification factor is also called toggle factor. The toggle magnification changes according to the angle θ formed between the first link 152 and the second link 153 (hereinafter also referred to as “link angle θ”). The link angle θ is obtained from the position of the crosshead 151 . When the link angle θ is 180°, the toggle magnification becomes maximum.

When the thickness of the mold apparatus 800 changes due to replacement of the mold apparatus 800 or temperature change of the mold apparatus 800, mold thickness adjustment is performed so that a predetermined mold clamping force can be obtained during mold clamping. In the mold thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle support 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle when the movable mold 820 touches the fixed mold 810 . to adjust.

The mold clamping device 100 has a mold thickness adjusting mechanism 180 . The mold thickness adjustment mechanism 180 adjusts the mold thickness by adjusting the distance L between the stationary platen 110 and the toggle support 130 . The timing of mold thickness adjustment is, for example, between the end of a molding cycle and the start of the next molding cycle. The mold thickness adjusting mechanism 180 is, for example, a threaded shaft 181 formed at the rear end of the tie bar 140, a screw nut 182 held by the toggle support 130 so as to be rotatable and non-retractable, and screwed to the threaded shaft 181. and a mold thickness adjusting motor 183 that rotates the screw nut 182 .

A threaded shaft 181 and a threaded nut 182 are provided for each tie bar 140 . The rotational driving force of the mold thickness adjusting motor 183 may be transmitted to the multiple screw nuts 182 via the rotational driving force transmission portion 185 . Multiple screw nuts 182 can be rotated synchronously. By changing the transmission path of the rotational driving force transmission portion 185, it is also possible to rotate the plurality of screw nuts 182 individually.

The rotational driving force transmission section 185 is configured by, for example, a gear. In this case, a driven gear is formed on the outer circumference of each screw nut 182, a driving gear is attached to the output shaft of the mold thickness adjusting motor 183, and an intermediate gear that meshes with a plurality of driven gears and the driving gear is formed in the central portion of the toggle support 130. rotatably held. It should be noted that the rotational driving force transmission section 185 may be configured by a belt, a pulley, or the like instead of the gear.

The operation of the mold thickness adjusting mechanism 180 is controlled by the controller 700 . The control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182 . As a result, the position of toggle support 130 with respect to tie bar 140 is adjusted, and the distance L between stationary platen 110 and toggle support 130 is adjusted. A plurality of mold thickness adjusting mechanisms may be used in combination.

The interval L is detected using the mold thickness adjusting motor encoder 184 . The mold thickness adjusting motor encoder 184 detects the amount and direction of rotation of the mold thickness adjusting motor 183 and sends a signal indicating the detection result to the control device 700 . The detection result of the mold thickness adjustment motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130 . The toggle support position detector for detecting the position of the toggle support 130 and the gap detector for detecting the gap L are not limited to the mold thickness adjusting motor encoder 184, and general ones can be used.

The mold clamping device 100 may have a mold temperature controller that regulates the temperature of the mold device 800 . The mold device 800 has a flow path for a temperature control medium inside. The mold temperature controller adjusts the temperature of the mold device 800 by adjusting the temperature of the temperature control medium supplied to the flow path of the mold device 800 .

The mold clamping device 100 of this embodiment is a horizontal type in which the mold opening/closing direction is horizontal, but may be a vertical type in which the mold opening/closing direction is a vertical direction.

Although the mold clamping device 100 of this embodiment has the mold clamping motor 160 as a drive source, the mold clamping motor 160 may be replaced by a hydraulic cylinder. Further, the mold clamping device 100 may have a linear motor for mold opening and closing and an electromagnet for mold clamping.

(ejector device)
In the description of the ejector device 200, as in the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (for example, the positive direction of the X axis) is defined as the front, and the moving direction of the movable platen 120 when the mold is opened (for example, X-axis negative direction) will be described as the rear.

The ejector device 200 is attached to the movable platen 120 and advances and retreats together with the movable platen 120 . The ejector device 200 has an ejector rod 210 that ejects a molded product from the mold device 800 and a drive mechanism 220 that moves the ejector rod 210 in the moving direction of the movable platen 120 (X-axis direction).

The ejector rod 210 is disposed in a through hole of the movable platen 120 so as to be able to move back and forth. The front end of ejector rod 210 contacts ejector plate 826 of movable mold 820 . The front end of ejector rod 210 may or may not be connected to ejector plate 826 .

The drive mechanism 220 has, for example, an ejector motor and a motion conversion mechanism that converts rotary motion of the ejector motor into linear motion of the ejector rod 210 . The motion conversion mechanism includes a threaded shaft and a threaded nut that screws onto the threaded shaft. Balls or rollers may be interposed between the screw shaft and the screw nut.

The ejector device 200 performs an ejection process under the control of the control device 700 . In the ejecting step, the ejector plate 826 is moved forward by advancing the ejector rod 210 from the standby position to the ejecting position at a set moving speed to eject the molded product. After that, the ejector motor is driven to retract the ejector rod 210 at the set movement speed, and the ejector plate 826 is retracted to the original standby position.

The position and moving speed of the ejector rod 210 are detected using, for example, an ejector motor encoder. The ejector motor encoder detects rotation of the ejector motor and sends a signal indicating the detection result to the control device 700 . The ejector rod position detector for detecting the position of the ejector rod 210 and the ejector rod moving speed detector for detecting the moving speed of the ejector rod 210 are not limited to the ejector motor encoder, and general ones can be used.

(Injection device)
In the description of the injection device 300, unlike the description of the mold clamping device 100 and the description of the ejector device 200, the moving direction of the screw 330 during filling (for example, the negative direction of the X axis) is defined as the forward direction, and the moving direction of the screw 330 during metering is defined as the forward direction. (For example, the positive direction of the X-axis) will be described as the rear.

The injection device 300 is installed on a slide base 301 , and the slide base 301 is arranged to move back and forth with respect to the injection device frame 920 . The injection device 300 is arranged to move back and forth with respect to the mold device 800 . The injection device 300 touches the mold device 800 and fills the cavity space 801 in the mold device 800 with the molding material. The injection device 300 includes, for example, a cylinder 310 that heats the molding material, a nozzle 320 that is provided at the front end of the cylinder 310, a screw 330 that is rotatably arranged in the cylinder 310 so that it can move back and forth, and a screw that rotates. , an injection motor 350 for advancing and retreating the screw 330 , and a load detector 360 for detecting the load transmitted between the injection motor 350 and the screw 330 .

The cylinder 310 heats the molding material supplied inside from the supply port 311 . The molding material includes, for example, resin. The molding material is formed into, for example, a pellet shape and supplied to the supply port 311 in a solid state. A supply port 311 is formed in the rear portion of the cylinder 310 . A cooler 312 such as a water-cooled cylinder is provided on the outer circumference of the rear portion of the cylinder 310 . A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 ahead of the cooler 312 .

Cylinder 310 is divided into a plurality of zones in the axial direction of cylinder 310 (for example, the X-axis direction). A heater 313 and a temperature detector 314 are provided in each of the plurality of zones. A set temperature is set for each of the plurality of zones, and the controller 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes the set temperature.

A nozzle 320 is provided at the front end of the cylinder 310 and pressed against the mold device 800 . A heater 313 and a temperature detector 314 are provided around the nozzle 320 . The controller 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes the set temperature.

The screw 330 is arranged in the cylinder 310 so as to be rotatable and advanceable. When the screw 330 is rotated, the molding material is sent forward along the helical groove of the screw 330 . The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. The screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . After that, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled in the mold device 800 .

A backflow prevention ring 331 is movably attached to the front portion of the screw 330 as a backflow prevention valve that prevents backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.

The anti-backflow ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 when the screw 330 is advanced, and is relatively to the screw 330 until it reaches a closed position (see FIG. 2) that blocks the flow path of the molding material. fall back. This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, the anti-backflow ring 331 is pushed forward by the pressure of the molding material sent forward along the helical groove of the screw 330 when the screw 330 is rotated, and is in an open position where the flow path of the molding material is opened. (see FIG. 1) relative to the screw 330. Thereby, the molding material is sent forward of the screw 330 .

The anti-backflow ring 331 may be either a co-rotating type that rotates together with the screw 330 or a non-co-rotating type that does not rotate together with the screw 330 .

The injection device 300 may have a drive source for advancing and retracting the anti-backflow ring 331 with respect to the screw 330 between the open position and the closed position.

Metering motor 340 rotates screw 330 . The drive source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump.

The injection motor 350 advances and retreats the screw 330 . Between the injection motor 350 and the screw 330, a motion conversion mechanism or the like that converts the rotary motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut screwed onto the screw shaft. Balls, rollers, or the like may be provided between the screw shaft and the screw nut. The drive source for advancing and retreating the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

Load detector 360 detects the load transmitted between injection motor 350 and screw 330 . The detected load is converted into pressure by the control device 700 . The load detector 360 is provided in a load transmission path between the injection motor 350 and the screw 330 and detects the load acting on the load detector 360 .

Load detector 360 sends a signal of the detected load to controller 700 . The load detected by the load detector 360 is converted into the pressure acting between the screw 330 and the molding material, the pressure received by the screw 330 from the molding material, the back pressure on the screw 330, and the pressure acting on the molding material from the screw 330. Used for control and monitoring of pressure, etc.

Incidentally, the pressure detector for detecting the pressure of the molding material is not limited to the load detector 360, and a general one can be used. For example, a nozzle pressure sensor or a mold internal pressure sensor may be used. A nozzle pressure sensor is installed at the nozzle 320 . The mold internal pressure sensor is installed inside the mold apparatus 800 .

The injection device 300 performs a weighing process, a filling process, a holding pressure process, and the like under the control of the control device 700 . The filling process and the holding pressure process may collectively be called an injection process.

In the weighing process, the weighing motor 340 is driven to rotate the screw 330 at a set rotation speed, and the molding material is fed forward along the helical groove of the screw 330 . Along with this, the molding material is gradually melted. The screw 330 is retracted as liquid molding material is fed forward of the screw 330 and accumulated at the front of the cylinder 310 . The rotation speed of the screw 330 is detected using a metering motor encoder 341, for example. Weighing motor encoder 341 detects the rotation of weighing motor 340 and sends a signal indicating the detection result to control device 700 . Incidentally, the screw rotation speed detector for detecting the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a general one can be used.

During the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 to limit its rapid retraction. The back pressure on the screw 330 is detected using a load detector 360, for example. The metering process is completed when the screw 330 is retracted to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330 .

The position and rotation speed of the screw 330 in the weighing process are collectively set as a series of setting conditions. For example, a weighing start position, rotation speed switching position, and weighing completion position are set. These positions are arranged in this order from the front side to the rear side, and represent the start point and end point of the section in which the rotational speed is set. A rotation speed is set for each section. The rotational speed switching position may be one or plural. The rotation speed switching position does not have to be set. Also, the back pressure is set for each section.

In the filling step, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the liquid molding material accumulated in front of the screw 330 is filled into the cavity space 801 in the mold device 800 . The position and moving speed of the screw 330 are detected using an injection motor encoder 351, for example. The injection motor encoder 351 detects rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700 . When the position of the screw 330 reaches the set position, switching from the filling process to the holding pressure process (so-called V/P switching) is performed. The position at which V/P switching takes place is also called the V/P switching position. The set moving speed of the screw 330 may be changed according to the position of the screw 330, time, and the like.

The position and moving speed of the screw 330 in the filling process are collectively set as a series of setting conditions. For example, a filling start position (also called an “injection start position”), a moving speed switching position, and a V/P switching position are set. These positions are arranged in this order from the rear side to the front side, and represent the start point and end point of the section for which the movement speed is set. A moving speed is set for each section. The moving speed switching position may be one or plural. The moving speed switching position does not have to be set.

An upper limit value of the pressure of the screw 330 is set for each section in which the moving speed of the screw 330 is set. The pressure of screw 330 is detected by load detector 360 . When the pressure of the screw 330 is below the set pressure, the screw 330 is advanced at the set travel speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 is advanced at a moving speed slower than the set moving speed so that the pressure of the screw 330 is equal to or less than the set pressure for the purpose of mold protection.

After the position of the screw 330 reaches the V/P switching position in the filling process, the screw 330 may be temporarily stopped at the V/P switching position, and then the V/P switching may be performed. Immediately before the V/P switching, instead of stopping the screw 330, the screw 330 may be slowly advanced or slowly retracted. Further, the screw position detector for detecting the position of the screw 330 and the screw moving speed detector for detecting the moving speed of the screw 330 are not limited to the injection motor encoder 351, and general ones can be used.

In the holding pressure process, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the front end of the screw 330 (hereinafter also referred to as “holding pressure”) is maintained at the set pressure. The remaining molding material is pushed toward the mold device 800 . A shortage of molding material due to cooling shrinkage in the mold apparatus 800 can be replenished. The holding pressure is detected using the load detector 360, for example. The set value of the holding pressure may be changed according to the elapsed time from the start of the holding pressure process. A plurality of holding pressures and holding times for holding the holding pressure in the holding pressure step may be set respectively, and may be collectively set as a series of setting conditions.

In the holding pressure process, the molding material in the cavity space 801 inside the mold apparatus 800 is gradually cooled, and when the holding pressure process is completed, the entrance of the cavity space 801 is closed with the solidified molding material. This state is called a gate seal, and prevents the molding material from flowing back from the cavity space 801 . After the holding pressure process, the cooling process is started. In the cooling process, the molding material inside the cavity space 801 is solidified. A metering step may be performed during the cooling step for the purpose of shortening the molding cycle time.

Although the injection device 300 of this embodiment is of the in-line screw type, it may be of a pre-plastic type or the like. A pre-plastic injection apparatus supplies molding material melted in a plasticizing cylinder to an injection cylinder, and injects the molding material from the injection cylinder into a mold apparatus. Inside the plasticizing cylinder, a screw is arranged to be rotatable and non-retractable, or a screw is arranged to be rotatable and reciprocal. On the other hand, a plunger is arranged in the injection cylinder so that it can move back and forth.

Further, the injection apparatus 300 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is horizontal, but may be a vertical type in which the axial direction of the cylinder 310 is vertical. The mold clamping device combined with the vertical injection device 300 may be either vertical or horizontal. Similarly, the mold clamping device combined with the horizontal injection device 300 may be horizontal or vertical.

(moving device)
In the description of the moving device 400, as in the description of the injection device 300, the moving direction of the screw 330 during filling (for example, the negative direction of the X-axis) is defined as forward, and the moving direction of the screw 330 during weighing (eg, the positive direction of the X-axis). is described as backward.

The moving device 400 moves the injection device 300 forward and backward with respect to the mold device 800 . Further, the moving device 400 presses the nozzle 320 against the mold device 800 to generate nozzle touch pressure. The moving device 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

Hydraulic pump 410 has a first port 411 and a second port 412 . Hydraulic pump 410 is a pump that can rotate in both directions, and by switching the rotation direction of motor 420, hydraulic fluid (for example, oil) is sucked from one of first port 411 and second port 412 and discharged from the other. to generate hydraulic pressure. The hydraulic pump 410 can also suck the working fluid from the tank and discharge the working fluid from either the first port 411 or the second port 412 .

Motor 420 operates hydraulic pump 410 . Motor 420 drives hydraulic pump 410 with a rotational direction and rotational torque according to a control signal from control device 700 . Motor 420 may be an electric motor or may be an electric servomotor.

Hydraulic cylinder 430 has a cylinder body 431 , a piston 432 and a piston rod 433 . The cylinder body 431 is fixed with respect to the injection device 300 . The piston 432 partitions the inside of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. Piston rod 433 is fixed relative to stationary platen 110 .

The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via the first flow path 401 . The hydraulic fluid discharged from the first port 411 is supplied to the front chamber 435 through the first flow path 401, thereby pushing the injection device 300 forward. The injection device 300 is advanced and the nozzle 320 is pressed against the stationary mold 810 . The front chamber 435 functions as a pressure chamber that generates nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410 .

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via the second flow path 402 . The hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the second flow path 402, thereby pushing the injection device 300 rearward. The injection device 300 is retracted and the nozzle 320 is separated from the stationary mold 810 .

Although the moving device 400 includes the hydraulic cylinder 430 in this embodiment, the present invention is not limited to this. For example, instead of the hydraulic cylinder 430, an electric motor and a motion conversion mechanism that converts the rotary motion of the electric motor to the linear motion of the injection device 300 may be used.

(Control device)
The control device 700 is composed of, for example, a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704, as shown in FIGS. The control device 700 performs various controls by causing the CPU 701 to execute programs stored in the storage medium 702 . The control device 700 also receives signals from the outside through an input interface 703 and transmits signals to the outside through an output interface 704 .

The control device 700 repeatedly performs a weighing process, a mold closing process, a pressurizing process, a mold clamping process, a filling process, a holding pressure process, a cooling process, a depressurizing process, a mold opening process, and an ejecting process, thereby producing a molded product. Repeat production. A series of operations for obtaining a molded product, for example, the operation from the start of the weighing process to the start of the next weighing process, is also called "shot" or "molding cycle". The time required for one shot is also called "molding cycle time" or "cycle time".

One molding cycle has, for example, a weighing process, a mold closing process, a pressure increasing process, a mold clamping process, a filling process, a holding pressure process, a cooling process, a depressurizing process, a mold opening process, and an ejecting process in this order. The order here is the order of the start of each step. The filling process, holding pressure process, and cooling process are performed during the clamping process. The start of the clamping process may coincide with the start of the filling process. Completion of the depressurization process coincides with the start of the mold opening process.

A plurality of steps may be performed simultaneously for the purpose of shortening the molding cycle time. For example, the metering step may occur during the cooling step of the previous molding cycle and may occur during the clamping step. In this case, the mold closing process may be performed at the beginning of the molding cycle. The filling process may also be initiated during the mold closing process. Also, the ejecting process may be initiated during the mold opening process. If an on-off valve for opening and closing the flow path of the nozzle 320 is provided, the mold opening process may be initiated during the metering process. This is because the molding material does not leak from the nozzle 320 as long as the on-off valve closes the flow path of the nozzle 320 even if the mold opening process is started during the metering process.

One molding cycle includes processes other than the weighing process, mold closing process, pressurization process, mold clamping process, filling process, holding pressure process, cooling process, depressurization process, mold opening process, and ejection process. may

For example, after the pressure holding process is completed and before the measurement process is started, a pre-measuring suckback process may be performed to retract the screw 330 to a preset measurement start position. It is possible to reduce the pressure of molding material accumulated in front of the screw 330 before the start of the metering process, and to prevent the screw 330 from abrupt retraction at the start of the metering process.

After the weighing process is completed and before the filling process starts, a post-weighing suck-back process may be performed in which the screw 330 is retracted to a preset filling start position (also referred to as an “injection start position”). The pressure of the molding material accumulated in front of the screw 330 before the start of the filling process can be reduced, and leakage of the molding material from the nozzle 320 before the start of the filling process can be prevented.

The control device 700 is connected to an operation device 750 that receives user input operations and a display device 760 that displays a screen. The operation device 750 and the display device 760 may be configured by, for example, a touch panel 770 and integrated. A touch panel 770 as a display device 760 displays a screen under the control of the control device 700 . Information such as the settings of the injection molding machine 1 and the current state of the injection molding machine 1 may be displayed on the screen of the touch panel 770 . Further, on the screen of the touch panel 770, for example, an operation unit such as a button for receiving an input operation by the user or an input field may be displayed. A touch panel 770 as the operation device 750 detects an input operation on the screen by the user and outputs a signal corresponding to the input operation to the control device 700 . As a result, for example, the user can operate the operation unit provided on the screen while confirming the information displayed on the screen to set the injection molding machine 1 (including input of set values). can. In addition, the user can operate the operation unit provided on the screen to cause the injection molding machine 1 to perform the operation corresponding to the operation unit. The operation of the injection molding machine 1 may be, for example, the operation (including stopping) of the mold clamping device 100, the ejector device 200, the injection device 300, the moving device 400, and the like. Also, the operation of the injection molding machine 1 may be switching of screens displayed on the touch panel 770 as the display device 760 .

Although the operating device 750 and the display device 760 of the present embodiment have been described as being integrated as the touch panel 770, they may be provided independently. Also, a plurality of operating devices 750 may be provided. The operating device 750 and the display device 760 are arranged on the operating side (Y-axis negative direction) of the mold clamping device 100 (more specifically, the stationary platen 110).

<Movable platen>
Next, the movable platen 120 will be further described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a front view of the movable platen 120. FIG. FIG. 4 is a side view of the movable platen 120. FIG. In the following description, when the movable platen 120 is viewed from the front, the left and right directions are also referred to as anti-operation directions (anti-operation directions) (±Y directions). Further, when the movable platen 120 is viewed from the front, the front-rear direction is also referred to as a slide direction (±X direction). Further, when the movable platen 120 is viewed from the front, the upward direction is also referred to as the vertical direction (+Z direction).

The movable platen 120 has a mold mounting portion 121, a support portion 122, a toggle pin connecting portion 123, and a pair of leg portions 124A and 124B. The mold mounting portion 121 and the support portion 122 supported by the pair of leg portions 124A and 124B are also called a movable platen main body.

A movable mold 820 is attached to the surface of the mold mounting portion 121 . Cutouts 121a through which the tie bars 140 pass are provided at the four corners of the mold mounting portion 121 .

The support portion 122 is provided at the center of the back surface of the mold mounting portion 121 . The support portion 122 has a substantially rectangular cylindrical shape with an opening at the rear (−X direction). A drive mechanism 220 of the ejector device 200 is arranged in the support portion 122 .

The toggle pin connection portion 123 is provided on the support portion 122 . The toggle pin connecting portion 123 is connected to the first link 152 via a connecting pin. A mold clamping force from the mold clamping device 100 is transmitted to the center of the back side of the mold mounting portion 121 via the toggle pin connection portion 123 and the support portion 122 .

The leg portion 124A includes a foot portion 124A1 to which the slider 105 is attached, a first leg portion 124A2 vertically extending from the foot portion 124A1, and a second leg connected to the center of the support portion 122 in the height direction from the first leg portion 124A2. and a portion 124A3.

The leg portion 124A1 is a member whose longitudinal direction is the sliding direction (X direction), and as shown in FIG. Sliders 105 that move along the guides 101 are attached to the lower surface of the leg portion 124A1 on one side in the longitudinal direction (+X direction) and the other side in the longitudinal direction (−X direction). The foot portion 124A1 is formed with a through hole (not shown) penetrating from the upper surface of the foot portion 124A1 toward the lower surface of the foot portion 124A1 (lower surface S1 described later in FIG. 5). The slider 105 is fixed to the foot portion 124A1 by the bolt 106 that is attached. Note that the leg portion 124A1 will be described later with reference to FIG.

The first leg portion 124A2 is a member extending vertically from substantially the longitudinal center of the leg portion 124A1. The second leg portion 124A3 is a member that obliquely extends toward the support portion 122 from the upper end of the first leg portion 124A2. The second leg portion 124A3 is connected to the support portion 122 at a substantially central position of the support portion 122 in the height direction. In other words, the second leg portion 124A3 extends obliquely downward to the left when viewed from the surface side of the mold mounting portion 121, as shown in FIG.

Similarly, the leg portion 124B includes a leg portion 124B1 to which the slider 105 is attached, a first leg portion 124B2 extending vertically from the leg portion 124B1, and the first leg portion 124B2 connected to the center of the support portion 122 in the height direction. and a second leg 124B3.

The leg portion 124B1 is a member whose longitudinal direction is the sliding direction (X direction), and as shown in FIG. Sliders 105 that move along guides 101 are attached to the lower surface of leg 124B1 on one longitudinal side (+X direction) and on the other longitudinal side (−X direction). The foot portion 124B1 is formed with a through hole (not shown) penetrating from the upper surface of the foot portion 124B1 toward the lower surface of the foot portion 124B1 (the lower surface S4 described later in FIG. 6). The slider 105 is fixed to the foot portion 124B1 by the bolt 106 that is attached. Note that the leg portion 124B1 will be described later with reference to FIG.

The first leg portion 124B2 is a member extending vertically from substantially the longitudinal center of the leg portion 124B1. The second leg portion 124B3 is a member that obliquely extends toward the support portion 122 from the upper end of the first leg portion 124B2. The second leg portion 124B3 is connected to the support portion 122 at a substantially central position of the support portion 122 in the height direction. In other words, the second leg portion 124B3 extends obliquely downward to the right when viewed from the surface side of the mold mounting portion 121, as shown in FIG.

Thereby, the leg portions 124A1 and 124B1 are arranged outside the tie bar 140 in the operation counter-operation direction. Further, the leg portions 124A1 and 124B1 are arranged outside the platen main body (the mold mounting portion 121 and the support portion 122) in the operation counter-operation direction.

Also, one leg portion 124A is provided with a stopper bolt mounting portion 124A4 for mounting a stopper bolt (not shown) for stopping the movement of the movable platen 120. As shown in FIG. By locking the stopper bolts, the movable platen 120 becomes immovable.

Thus, the mold mounting portion 121 and the support portion 122 of the movable platen 120 are supported by the leg portions 124A and 124B at the central position in the height direction. Here, the heat of the mold apparatus 800 is generated by the mold mounting portion 121, the support portion 122 provided at the center of the back surface of the mold mounting portion 121, the legs 124A and 124B extending from the center of the support portion 122 in the height direction, and the legs. Heat is transferred from the portions 124A1 and 124B1 to the mold clamping device frame 910 . As a result, the temperature of the mold device 800 attached to the mold mounting portion 121 is asymmetric with respect to the vertical direction, compared to the movable platen in which the leg portion is directly connected to the lower portion of the mold mounting portion. can be suppressed.

Next, the legs 124A1 and 124B1 will be further described with reference to FIGS. 5 and 6. FIG.

FIG. 5 is an enlarged view of one leg 124A1 of the movable platen 120. As shown in FIG. The leg portion 124A1 has a "U" shape with an open bottom when viewed from the front.

A lower surface S1 of the foot portion 124A1 contacts the upper surface of the slider 105. As shown in FIG. Further, the lower surface S1 in contact with the slider 105 is a machined surface with improved accuracy.

On the side opposite to the operation direction (right side in FIG. 5) of the lower surface S1 of the foot portion 124A1, there is provided a positioning plate projecting downward from the lower surface S1 for positioning the slider 105 fixed to the foot portion 124A1 in the operation counter-operation direction. It has a part 11 . The positioning portion 11 is a member whose longitudinal direction is the sliding direction (X direction), and is formed below the lower surface S1 of the leg portion 124A1. That is, the lower surface S11 of the positioning portion 11 is formed below the lower surface S1 of the leg portion 124A1. A side surface S<b>2 in the operation direction (left side in FIG. 5 ) of the positioning portion 11 is a surface that contacts the slider 105 . When the slider 105 is fixed to the foot portion 124A1, the side surface of the slider 105 in the counter-operation direction (the right side in FIG. 5) is brought into contact with the side surface S2 of the positioning portion 11, thereby positioning the slider 105 in the operation counter-operation direction. be. Further, the side surface S2 in contact with the slider 105 is a machined surface with improved accuracy.

The lower surface S1 of the foot portion 124A1 has a bolt support portion 12 protruding downward from the lower surface S1 on the operation direction side (left side in FIG. 5). The bolt support portion 12 is a member whose longitudinal direction is the sliding direction (X direction), and is formed below the lower surface S1 of the leg portion 124A1. That is, the bottom surface S12 of the bolt support portion 12 is formed below the bottom surface S1 of the leg portion 124A1.

A bolt hole (not shown) is formed through the bolt support portion 12 from the side surface in the operation direction (left side in FIG. 5) toward the side surface S3 in the counter-operation direction (right side in FIG. 5). A bolt 13 for pressing the slider 105 against the side surface S2 of the positioning portion 11 is screwed into this bolt hole. Also, the width between the side surface S2 of the positioning portion 11 and the side surface S3 of the bolt support portion 12 is formed slightly wider than the width of the slider 105 .

By turning the bolt 13, the tip of the bolt 13 protrudes from the side surface S3 in the direction opposite to the operation (right side in FIG. 5), and the side surface of the slider 105 is pushed. As a result, the slider 105 is pressed against the side surface S2 of the positioning portion 11, and the slider 105 is positioned. Further, as shown in FIG. 5, there is a gap between the side surface S3 of the bolt support portion 12 and the slider 105 when the slider 105 is positioned.

A shim (not shown) for adjustment may be inserted between the positioning portion 11 and the slider 105 . Further, the positioning portion 11 is formed with a bolt hole (not shown) penetrating from the side surface in the counter-operation direction (right side in FIG. 5) toward the side surface S2 in the operation direction (left side in FIG. 5). A bolt 14 for forming a gap between the side surface S2 of the positioning portion 11 and the slider 105 is screwed into the bolt hole when inserting an adjusting shim between the positioning portion 11 and the slider 105 .

When the bolt 13 is loosened and the tip of the bolt 13 is separated from the side surface of the slider 105, the bolt 14 is turned to project the tip of the bolt 14 from the side surface S2 toward the operation direction (left side in FIG. 5). The side of the slider 105 is pushed. As a result, the slider 105 is separated from the side surface S<b>2 of the positioning portion 11 , and a gap can be formed between the side surface S<b>2 of the positioning portion 11 and the slider 105 into which a shim can be inserted. By burying the tip of the bolt 14 in the side surface S2, inserting a shim into the gap, and pressing the slider 105 toward the side surface S2 of the positioning portion 11 with the bolt 13, positioning is performed with the shim inserted. .

Then, after the positioning in the direction opposite to the operation is performed, the bolt 106 fixes the slider 105 and the foot portion 124A1. A through hole (not shown) through which the bolt 106 is inserted provided in the foot portion 124A1 is formed to have a diameter larger than the shaft diameter of the bolt 106 so that the positioning can be adjusted.

Further, the lower surface S11 of the positioning portion 11 and the lower surface S12 of the bolt support portion 12 protrude to the same position.

The side surface of the positioning portion 11 in the counter-operation direction (the right side in FIG. 5) may protrude in the counter-operation direction more than the side surface of the leg portion 124A1 in the counter-operation direction. Thereby, the thickness of the positioning portion 11 in the direction opposite to the operation can be increased.

Further, the side surface of the bolt support portion 12 in the operation direction (left side in FIG. 5) may protrude in the operation direction more than the side surface of the leg portion 124A1 in the operation direction. As a result, the thickness of the bolt support portion 12 in the anti-operation direction can be increased.

6 is an enlarged view of the other leg portion 124B1 of the movable platen 120. FIG. The leg portion 124B1 has an "L" shape that is open downward and rightward when viewed from the front.

A lower surface S4 of the foot portion 124B1 contacts the upper surface of the slider 105. As shown in FIG. Further, the lower surface S4 in contact with the slider 105 is a machined surface with improved accuracy.

The lower surface S4 of the foot portion 124B1 has a projecting portion 21 projecting downward from the lower surface S4 on the operation direction side (left side in FIG. 6). The projecting portion 21 is a member whose longitudinal direction is the sliding direction (X direction), and is formed below the lower surface S4 of the leg portion 124B1. That is, the lower surface S21 of the projecting portion 21 is formed below the lower surface S1 of the leg portion 124A1. Further, the lower surface S21 of the protruding portion 21 protrudes downward to the same position as the lower surface S11 of the positioning portion 11 and/or the lower surface S12 of the bolt support portion 12 . That is, the lower surface S21 of the protruding portion 21, the lower surface S11 of the positioning portion 11 and/or the lower surface S12 of the bolt support portion 12 protrude to the same position (see broken lines in FIG. 3).

Further, the side surface of the protruding portion 21 in the counter-operation direction (the right side in FIG. 6) has a stepped portion between it and the lower surface S4 of the foot portion 124B1. That is, the side surface of the protruding portion 21 on which the slider 105 is provided has a stepped portion composed of the side surface S5 and the side surface S6. A lower surface S4 in contact with the upper surface of the slider 105 and a side surface S5 continuous with the lower surface S4 are machined surfaces with high accuracy. On the other hand, the side surface S6 may be formed in a direction away from the slider 105 than the side surface S5 and may not be precisely formed. By forming a step between the side surface S5 and the side surface S6, the area of the precision machined surface can be reduced.

Further, the projecting portion 21 is provided on the center side of the movable platen 120 on the lower surface S4 of the leg portion 124B1. That is, the projecting portion 21 projecting from the lower surface S4 of the foot portion 124B1 is provided closer to the center of the movable platen 120 than the slider 105 in the operation counter-operation direction. Thereby, the width of the movable platen 120 can be suppressed.

The slider 105 and the leg portion 124B1 are fixed with the bolt 106 after positioning in the direction opposite to the operation on the side of the leg portion 124A1. A through-hole (not shown) through which the bolt 106 is inserted provided in the foot portion 124B1 is formed to have a diameter larger than the shaft diameter of the bolt 106 so that the positioning can be adjusted. Further, as shown in FIG. 6, there is a gap between the side surfaces S5 and S6 of the projecting portion 21 and the slider 105 when the slider 105 is positioned.

With such a configuration, the movable platen 120 can stand on its own by grounding the lower surface S11 and the lower surface S21 in the state of the movable platen 120 alone before the slider 105 and the like are attached. As a result, the movable platen 120 can be mounted and made independent without using a spacer or the like for adjusting the height of the left and right leg portions 124A and 124B. For example, in the assembly work and maintenance work of the movable platen 120, the workability can be improved because the movable platen 120 can be placed on the floor and stand on its own. Further, when performing additional machining on the movable platen 120, it can be placed on the workbench to stand on its own, so workability can be improved.

Although the embodiments and the like of the injection molding machine have been described above, the present invention is not limited to the above-described embodiments and the like. Improvements are possible.

The protruding portion 21 may be arranged symmetrically with respect to the center line of the positioning portion 11 and the movable platen 120 . As a result, when the movable platen 120 is placed, it can stand on its own more stably.

Further, the projecting portion 21 may be provided outside the movable platen 120 relative to the slider 105 in the operation counter-operation direction.

Also, a plurality of projecting portions 21 may be provided. For example, they may be provided closer to the center and outside of the movable platen 120 than the slider 105 in the operation counter-operation direction. In other words, the leg portion 124B1 may have a U-shape when viewed from the front.

1 Injection molding machine 11 Positioning part 12 Bolt support part 13 Bolt 14 Bolt 21 Protruding part 100 Mold clamping device 101 Guide 105 Slider 106 Bolt 120 Movable platen 121 Mold attachment part 121a Notch 122 Support part 123 Toggle pin connecting part 124A, 124B Leg Parts 124A1, 124B1 Foot parts 124A2, 124B2 First leg parts 124A3, 124B3 Second leg part 124A4 Stopper bolt mounting part 140 Tie bar S1 Lower surface (lower surface of one leg)
S2 side S3 side S4 lower surface (lower surface of the other leg)
S5 side S6 side S11 lower surface (lower surface of the positioning part)
S12 lower surface (side surface of bolt support)
S21 lower surface (lower surface of protrusion)

Claims (9)

a platen body;
a pair of legs connected to the platen body and having a slider connected to the lower surface;
one of the legs has a positioning portion protruding downward on the lower surface for positioning the slider in the steering direction,
The other leg has a protrusion on the lower surface that protrudes to the same position as the lower surface of the positioning part,
movable platen. The protrusion and the slider connected to the other leg have a gap,
The movable platen of claim 1. The protruding portion is arranged symmetrically with respect to the center line of the positioning portion and the movable platen,
A movable platen according to claim 1 or claim 2. The protrusion is provided on the lower surface of the other leg on the center side of the movable platen,
The movable platen according to any one of claims 1 to 3. The side surface of the protrusion has a stepped portion between the lower surface of the other leg,
The movable platen according to any one of claims 1 to 4. A plurality of the protrusions are provided on the lower surface of the other leg,
The movable platen according to any one of claims 1 to 5. A plurality of the protrusions are provided across the slider connected to the lower surface of the other leg,
7. The movable platen of claim 6. The leg is connected to a side surface of the platen body,
A movable platen according to any one of claims 1 to 7. the leg has a foot to which the slider is connected,
The foot portion is arranged outside the platen main body in the direction of manipulation,
The movable platen according to any one of claims 1 to 8.

Images