Injection molding machine

Abstract

The present invention provides a technology capable of suppressing an overload state of a driver driving a pressurizing device for an injection molding machine, the pressurizing device pressurizing a molding material filled in a mold device such as an ejector device and a core puller device. An injection molding machine (10) according to one embodiment of the present invention comprises: an ejector device (200) including an ejector rod (210) for pressurizing a molding material filled in a mold device (800) and an ejector motor (221) for driving the ejector rod (210); a control device (700) for controlling the ejector motor (221); and a display device (760) for displaying a setting screen (1000) for setting a control torque curve of an ejector motor (221) based on the control device (700) according to a variation curve of a mold internal pressure in a cavity space (801) of a mold device (800) indicating a force that overcomes the drive of the ejector motor (221).

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2019-217087 filed on November 29, 2019. The entire contents of the Japanese patent application are incorporated herein by reference.

[0002] The invention relates to an injection molding machine. Background Art

[0003] For example, in an injection molding machine, ejector compression is sometimes performed to compress the molding material (resin) inside a mold (inside a cavity space) using an ejector (for example, refer to Patent Document 1).

[0004] Furthermore, there is known a technique in which a stopper is provided in the ejector to limit the amount of movement (for example, refer to Patent Document 2).

[0005] Patent Document 1: Japanese Patent No. 5850990

[0006] Patent Document 2: Japanese Patent No. 4095013

[0007] However, for example, when performing ejection compression, the driver is sometimes controlled so that the ejector is pressed against the mechanical end (stopper) to prevent the position of the front end of the movable part from deviating from the appropriate position due to the retreat of the molding material from the cavity. In this case, since the driver continues to output a relatively high torque, the driver falls into an overload state, resulting in the possibility of causing the injection molding machine to stop abnormally.

[0008] Regardless of the presence or absence of the mechanical end, the same situation may occur when performing ejection compression for transfer purposes. This is because, for example, if the pattern of the front end of the movable part is to be reliably transferred to the molding material in the cavity space, it is necessary to keep the front end of the movable part pressed against the molding material for a certain period of time, and there is a possibility that the driver will continue to output a relatively high torque.

[0009] The same situation may occur when the molding material inside the mold (inside the cavity) is compressed (hereinafter, "core compression") using a core puller. This is because, for example, when the core is compressed, the driver is controlled in a manner that is pressed against the machine end to prevent the position of the core front end from deviating from the appropriate position due to the retreat of the molding material from the cavity, and there is a possibility that the driver continues to output a relatively high torque.

[0010] The same situation may also occur when cutting the gate of a mold using an ejector. This is because, for example, when cutting the gate of a mold, the blade tip needs to be pressed into the gate portion to a certain extent to cut the gate portion, and there is a possibility that the driver will continue to output a relatively high torque. Summary of the invention

[0011] Therefore, in view of the above problems, an object is to provide a technology capable of suppressing an overload state of a driver driving a pressurizing device for an injection molding machine, the pressurizing device pressurizing a molding material filled in a mold device such as an ejector device and a core puller device.

[0012] In order to achieve the above object, in one embodiment of the present invention, there is provided an injection molding machine comprising:

[0013] A pressurizing device, comprising a pressurizing mechanism for pressurizing the molding material filled in the mold device and a driver for driving the pressurizing mechanism;

[0014] A control device for controlling the pressurizing device; and

[0015] display device,

[0016] The display device displays a screen for setting a control curve of the actuator by the control device based on a variation curve of a physical quantity related to a force that overcomes the driving of the actuator.

[0017] Effects of the Invention

[0018] According to the above embodiment, it is possible to provide a technique for suppressing an overload state of a driver that drives a pressurizing device for pressurizing a molding material filled in a mold device such as an ejector device and a core puller device in an injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a diagram showing an example of an injection molding machine.

[0020] Figure 2 This is a diagram showing an example of an injection molding machine.

[0021] Figure 3 It is a front perspective view showing an example of an ejection device.

[0022] Figure 4 It is a rear perspective view showing an example of an ejection device.

[0023] Figure 5 It is a top cross-sectional view showing an example of an ejection device.

[0024] Figure 6It is a side cross-sectional view showing the state of the movable member before the ejection compression starts.

[0025] Figure 7 It is a side cross-sectional view showing the state of the movable member during ejection compression.

[0026] Figure 8 It is a timing chart showing the operation state of the injection molding machine according to the comparative example during ejection compression.

[0027] Fig. 9 It is a timing chart showing the operation status of the injection molding machine during ejection compression according to the embodiment.

[0028] Fig.10 This is a diagram showing an example of a setting screen related to a control torque curve displayed on a display device.

[0029] In the figure: 10-injection molding machine, 100-mold clamping device, 200-ejection device (pressurizing device), 210-ejection rod (pressurizing mechanism), 221-ejection motor (driver), 300-injection device, 400-moving device, 700-control device, 701-CPU, 702-storage medium, 703-input interface, 704-output interface, 750-operating device, 760-display device, 800-mold device, 801-cavity space (cavity), MM-molding material. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments will be described with reference to the drawings.

[0031] [Structure of injection molding machine]

[0032] <Injection molding machine>

[0033] Figure 1 This is a diagram showing a state of the injection molding machine according to one embodiment when mold opening is completed. Figure 2 1 is a diagram showing a state of an injection molding machine according to an embodiment when the mold is clamped. In this specification, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other. The X-axis direction and the Y-axis direction represent horizontal directions, and the Z-axis direction represents a vertical direction. When the clamping device 100 is horizontal, the X-axis direction is the mold opening and closing direction, and the Y-axis direction is the width direction of the injection molding machine 10. The negative side of the Y-axis direction is referred to as the operating side, and the positive side of the Y-axis direction is referred to as the opposite side of the operating side.

[0034] like Figure 1-2As shown, the injection molding machine 10 includes a mold clamping device 100 for opening and closing a mold device 800, an ejection device 200 for ejecting a molded product molded by the mold device 800, an injection device 300 for injecting a molding material into the mold device 800, a moving device 400 for moving the injection device 300 forward and backward relative to the mold device 800, a control device 700 for controlling each component of the injection molding machine 10, and a frame 900 for supporting each component of the injection molding machine 10. The frame 900 includes a mold clamping device frame 910 for supporting the mold clamping device 100 and an injection device frame 920 for supporting the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are respectively installed on the base plate 2 via leveling casters 930. The control device 700 is arranged in the internal space of the injection device frame 920. Hereinafter, each component of the injection molding machine 10 will be described.

[0035] <Mold clamping device>

[0036] 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 set to the front, and the moving direction of the movable platen 120 when the mold is opened (for example, the negative direction of the X axis) is set to the rear.

[0037] The mold clamping device 100 performs mold closing, pressure raising, mold clamping, pressure release, and mold opening of the mold device 800. The mold device 800 includes a fixed mold 810 and a movable mold 820.

[0038] The mold clamping device 100 is, for example, horizontal, and the mold opening and closing direction is horizontal. The mold clamping device 100 includes a fixed platen 110 , a movable platen 120 , a toggle seat 130 , a connecting rod 140 , a toggle mechanism 150 , a mold clamping motor 160 , a motion conversion mechanism 170 and a mold thickness adjustment mechanism 180 .

[0039] The fixed platen 110 is fixed to the mold clamping device frame 910. The fixed mold 810 is attached to the surface of the fixed platen 110 that faces the movable platen 120.

[0040] The movable platen 120 is arranged to be movable in the mold opening and closing direction relative 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. The movable mold 820 is mounted on the surface of the movable platen 120 that faces the fixed platen 110. By moving the movable platen 120 forward and backward relative to the fixed platen 110, the mold device 800 is closed, pressurized, clamped, depressurized, and opened.

[0041] The toggle seat 130 is arranged with a gap between it and the fixed platen 110, and is placed on the mold clamping device frame 910 so as to be movable in the mold opening and closing direction. In addition, the toggle seat 130 may be arranged so as to be movable along a guide member laid on the mold clamping device frame 910. The guide member of the toggle seat 130 may be shared with the guide member 101 of the movable platen 120.

[0042] In addition, in the present embodiment, the fixed pressure plate 110 is fixed to the mold clamping device frame 910, and the elbow seat 130 is freely movable in the mold opening and closing direction relative to the mold clamping device frame 910, but the elbow seat 130 may also be fixed to the mold clamping device frame 910, and the fixed pressure plate 110 is freely movable in the mold opening and closing direction relative to the mold clamping device frame 910.

[0043] The connecting rod 140 connects the fixed platen 110 and the toggle seat 130 at a distance L along the mold opening and closing direction. A plurality of connecting rods 140 (for example, four) may be used. The plurality of connecting rods 140 are arranged to be parallel to the mold opening and closing direction and extend according to the mold clamping force. A connecting rod strain detector 141 for detecting the strain of the connecting rod 140 may be provided on at least one connecting rod 140. The connecting rod strain detector 141 sends a signal indicating its detection result to the control device 700. The detection result of the connecting rod strain detector 141 is used to detect the mold clamping force, etc.

[0044] In addition, in this embodiment, the tie rod strain detector 141 is used as the mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain type, and can be a piezoelectric type, a capacitance type, a hydraulic type, an electromagnetic type, etc., and its installation position is not limited to the tie rod 140.

[0045] The toggle mechanism 150 is arranged between the movable platen 120 and the toggle seat 130, and moves the movable platen 120 relative to the toggle seat 130 in the mold opening and closing direction. The toggle mechanism 150 is composed of a crosshead 151 and a pair of connecting rods. The pair of connecting rods respectively have a first connecting rod 152 and a second connecting rod 153 connected by a pin or the like so as to be retractable. The first connecting rod 152 is installed so as to be able to swing freely relative to the movable platen 120 by a pin or the like. The second connecting rod 153 is installed so as to be able to swing freely relative to the toggle seat 130 by a pin or the like. The second connecting rod 153 is installed to the crosshead 151 via the third connecting rod 154. If the crosshead 151 is moved forward or backward relative to the toggle seat 130, the first connecting rod 152 and the second connecting rod 153 are retracted and retracted, and the movable platen 120 is moved forward or backward relative to the toggle seat 130.

[0046] In addition, the structure of the toggle mechanism 150 is not limited to Figure 1 and Figure 2 For example, in Figure 1 and Figure 2In the embodiment, the number of nodes of each link group is 5, but may be 4, and one end of the third link 154 may be connected to the node between the first link 152 and the second link 153.

[0047] The mold clamping motor 160 is mounted on the toggle base 130 and operates the toggle mechanism 150. The mold clamping motor 160 causes the cross head 151 to advance and retreat relative to the toggle base 130, thereby extending and retracting the first link 152 and the second link 153 and causing the movable platen 120 to advance and retreat relative to the toggle base 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, a pulley, or the like.

[0048] The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into the linear motion of the cross head 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut screwed with the screw shaft. A ball or a roller may be interposed between the screw shaft and the screw nut.

[0049] The mold clamping device 100 performs a mold closing process, a pressure increasing process, a mold clamping process, a pressure releasing process, a mold opening process, and the like under the control of the control device 700 .

[0050] In the mold closing process, the mold clamping motor 160 is driven to move the crosshead 151 to the mold closing end position at a set moving speed, thereby moving the movable platen 120 forward and bringing the movable mold 820 into contact with the fixed mold 810. The position and moving speed of the crosshead 151 are detected, for example, using a mold clamping motor encoder 161. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700.

[0051] In addition, the crosshead position detector for detecting the position of the crosshead 151 and the crosshead moving speed detector for detecting the moving speed of the crosshead 151 are not limited to the mold clamping motor encoder 161, and a conventional detector can be used. In addition, 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 a conventional detector can be used.

[0052] In the pressure increasing step, the mold clamping motor 160 is further driven to further advance the cross head 151 from the mold closing end position to the mold clamping position, thereby generating a mold clamping force.

[0053] In the mold clamping process, the mold clamping motor 160 is driven to maintain the position of the cross head 151 at the mold clamping position. In the mold clamping process, the mold clamping force generated by the pressure increase process is maintained. In the mold clamping process, a cavity space 801 is formed between the movable mold 820 and the fixed mold 810 (refer to Figure 2), the injection device 300 fills the cavity space 801 with liquid molding material. The filled molding material is solidified, thereby obtaining a molded product.

[0054] The number of cavity spaces 801 may be one or more. In the latter case, multiple molded products are obtained at the same time. An insert may be arranged in a part of the cavity space 801, and a molding material may be filled in another part of the cavity space 801. A molded product in which the insert and the molding material are integrally molded can be obtained.

[0055] In the depressurization process, 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 to reduce the mold clamping force. The mold opening start position and the mold closing end position may be the same position.

[0056] In the mold opening process, the mold clamping motor 160 is driven to move the crosshead 151 backward from the mold opening start position to the mold opening end position at a set moving speed, thereby moving the movable platen 120 backward and separating the movable mold 820 from the fixed mold 810. Then, the ejector device 200 ejects the molded product from the movable mold 820.

[0057] The setting conditions in the mold closing process, the pressure increasing process and the mold clamping process are uniformly set as a series of setting conditions. For example, the moving speed, position (including the mold closing start position, the moving speed switching position, the mold closing end position and the mold clamping position) and the mold clamping force of the crosshead 151 in the mold closing process and the pressure increasing process are uniformly set as a series of setting conditions. The mold closing start position, the moving speed switching position, the mold closing end position and the mold clamping position are arranged in sequence from the back to the front, and indicate the starting point and end point of the interval for setting the moving speed. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position can also be not set. It is also possible to set only one of the mold clamping position and the mold clamping force.

[0058] The setting conditions in the pressure release process and the mold opening process are also set in the same way. For example, the moving speed and position (mold opening start position, moving speed switching position and mold opening end position) of the crosshead 151 in the pressure release process and the mold opening process are uniformly set as a series of setting conditions. The mold opening start position, the moving speed switching position and the mold opening end position are arranged in sequence from the front to the back, and represent the starting point and end point of the interval for setting the moving speed. The moving speed is set for each interval. The moving speed switching position can be one or more. The moving speed switching position can also be not set. The mold opening start position and the mold closing end position can be the same position. In addition, the mold opening end position and the mold closing start position can be the same position.

[0059] In addition, the moving speed and position of the movable platen 120 may be set instead of the moving speed and position of the crosshead 151. Furthermore, the mold clamping force may be set instead of the position of the crosshead (eg, mold clamping position) and the position of the movable platen.

[0060] However, the toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits it to the movable platen 120. The amplification ratio is also called the toggle magnification. The toggle magnification changes according to the angle θ (hereinafter also referred to as "link angle θ") formed by the first link 152 and the second link 153. The link angle θ is obtained from the position of the crosshead 151. When the link angle θ is 180°, the toggle magnification becomes the maximum.

[0061] When the thickness of the mold device 800 changes due to replacement of the mold device 800, temperature change of the mold device 800, etc., mold thickness adjustment is performed so that a predetermined mold clamping force is obtained when the mold is clamped. In the mold thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle seat 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle at the time of mold contact between the movable mold 820 and the fixed mold 810.

[0062] The mold clamping device 100 has a mold thickness adjustment mechanism 180. The mold thickness adjustment mechanism 180 adjusts the mold thickness by adjusting the interval L between the fixed platen 110 and the toggle seat 130. In addition, the timing of the mold thickness adjustment is performed, for example, during the period from the end of the molding cycle to the start of the next molding cycle. The mold thickness adjustment mechanism 180 has, for example, a screw shaft 181 formed at the rear end of the connecting rod 140, a screw nut 182 rotatably and non-retractably held on the toggle seat 130, and a mold thickness adjustment motor 183 that rotates the screw nut 182 threaded with the screw shaft 181.

[0063] A screw shaft 181 and a screw nut 182 are provided for each connecting rod 140. The rotational driving force of the mold thickness adjustment motor 183 can be transmitted to the plurality of screw nuts 182 via the rotational driving force transmission unit 185. The plurality of screw nuts 182 can be rotated synchronously. In addition, the plurality of screw nuts 182 can be rotated individually by changing the transmission path of the rotational driving force transmission unit 185.

[0064] The rotational driving force transmission part 185 is composed of, for example, gears, etc. In this case, a passive gear is formed on the outer periphery of each lead screw nut 182, a driving gear is mounted on the output shaft of the mold thickness adjustment motor 183, and an intermediate gear meshing with a plurality of passive gears and the driving gear is rotatably held in the center of the toggle seat 130. In addition, the rotational driving force transmission part 185 may also be composed of a belt, a pulley, etc. instead of a gear.

[0065] The operation of the mold thickness adjustment mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjustment motor 183 to rotate the lead screw nut 182. As a result, the position of the toggle seat 130 relative to the connecting rod 140 is adjusted, and the interval L between the fixed platen 110 and the toggle seat 130 is adjusted. In addition, a plurality of mold thickness adjustment mechanisms may be used in combination.

[0066] The interval L is detected using the mold thickness adjustment motor encoder 184. The mold thickness adjustment motor encoder 184 detects the rotation amount and rotation direction of the mold thickness adjustment 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 to monitor and control the position of the toggle seat 130 and the interval L. In addition, the toggle seat position detector for detecting the position of the toggle seat 130 and the interval detector for detecting the interval L are not limited to the mold thickness adjustment motor encoder 184, and a conventional detector can be used.

[0067] Furthermore, the mold clamping device 100 of the present embodiment is a horizontal type in which the mold opening and closing direction is the horizontal direction, but may be a vertical type in which the mold opening and closing direction is the vertical direction.

[0068] The mold clamping device 100 of this embodiment includes the mold clamping motor 160 as a driving source, but may include a hydraulic cylinder instead of the mold clamping motor 160. The mold clamping device 100 may include a mold opening and closing linear motor or a mold clamping electromagnet.

[0069] <Ejector device>

[0070] In the description of the ejection device 200, similar to 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 set to the front, and the moving direction of the movable platen 120 when the mold is opened (for example, the negative direction of the X-axis) is set to the rear.

[0071] The ejector device 200 (an example of a pressurizing device) is mounted on the movable platen 120 and moves forward and backward together with the movable platen 120. The ejector device 200 includes an ejector rod 210 for ejecting a molded product from the mold device 800 and a drive mechanism 220 for moving the ejector rod 210 in the moving direction (X-axis direction) of the movable platen 120.

[0072] The ejector rod 210 is arranged to be able to move forward and backward in the through hole of the movable platen 120. The front end of the ejector rod 210 contacts the movable member 830 which is arranged to move forward and backward inside the movable mold 820. The front end of the ejector rod 210 may be connected to the movable member 830 or may not be connected.

[0073] The drive mechanism 220 includes, for example, an ejector motor and a motion conversion mechanism that converts the rotational motion of the ejector motor into the linear motion of the ejector rod 210. The motion conversion mechanism includes a screw shaft and a screw nut screwed with the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

[0074] The ejector device 200 performs an ejection process under the control of the control device 700. In the ejection process, the ejector rod 210 is moved forward from the standby position to the ejection position at a set moving speed, thereby moving the movable member 830 forward to eject the molded product. Then, the ejector motor is driven to move the ejector rod 210 backward at a set moving speed, and the movable member 830 is moved backward to the original standby position.

[0075] The position and moving speed of the ejector rod 210 are detected using, for example, an ejector motor encoder. The ejector motor encoder detects the rotation of the ejector motor and sends a signal indicating the detection result to the control device 700. In addition, 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 a conventional detector can be used.

[0076] <Injection device>

[0077] In the description of the injection device 300, unlike the description of the mold clamping device 100 and the description of the ejection device 200, the moving direction of the screw 330 during filling (for example, the negative direction of the X-axis) is set to the front, and the moving direction of the screw 330 during metering (for example, the positive direction of the X-axis) is set to the rear for description.

[0078] The injection device 300 is provided on a slide base 301, and the slide base 301 is configured to be able to move forward and backward relative to the injection device frame 920. The injection device 300 is configured to be able to move forward and backward relative to the mold device 800. The injection device 300 contacts the mold device 800 and fills the molding material into the cavity space 801 in the mold device 800. The injection device 300 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, and a pressure detector 360.

[0079] The cylinder 310 heats the molding material supplied from the supply port 311. The molding material includes, for example, resin. The molding material is formed into, for example, granules and supplied to the supply port 311 in a solid state. The supply port 311 is formed at the rear of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear of the cylinder 310. A heater 313 such as a belt heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 in front of the cooler 312.

[0080] The cylinder 310 is divided into a plurality of regions along the axial direction (e.g., the X-axis direction) of the cylinder 310. Heaters 313 and temperature detectors 314 are respectively provided in the plurality of regions. Set temperatures are respectively set for the plurality of regions, and the control device 700 controls the heater 313 so that the detected temperature of the temperature detector 314 becomes the set temperature.

[0081] The nozzle 320 is provided at the front end of the cylinder 310, and presses the mold device 800. A heater 313 and a temperature detector 314 are provided on the outer periphery of the nozzle 320. The control device 700 controls the heater 313 so that the detected temperature of the nozzle 320 becomes a set temperature.

[0082] The screw 330 is configured to be able to rotate freely and to move forward and backward freely in the cylinder 310. When the screw 330 is rotated, the molding material is transported forward along the spiral groove of the screw 330. While the molding material is transported forward, it is gradually melted by the heat from the cylinder 310. As the liquid molding material is transported forward to the front of the screw 330 and accumulated in the front part of the cylinder 310, the screw 330 is retreated. Then, 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.

[0083] A check ring 331 is installed at the front of the screw 330 so as to be able to move forward and backward. The check ring 331 serves as a check valve to prevent the molding material from flowing backward from the front to the rear of the screw 330 when the screw 330 is pushed forward.

[0084] When the screw 330 is advanced, the check ring 331 is pressed backward by the pressure of the molding material in front of the screw 330, and moves back relative to the screw 330 to a closed position that blocks the flow path of the molding material (see FIG. Figure 2 ). Thus, the molding material accumulated in front of the screw 330 is prevented from flowing backward.

[0085] On the other hand, when the screw 330 is rotated, the check ring 331 is pressed forward by the pressure of the molding material conveyed to the front along the spiral groove of the screw 330, and moves forward relative to the screw 330 to an open position (refer to Figure 1 ). As a result, the molding material is transported to the front of the screw 330.

[0086] The check ring 331 may be of 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 .

[0087] In addition, the injection device 300 may include a driving source that moves the check ring 331 forward and backward relative to the screw 330 between the open position and the closed position.

[0088] The metering motor 340 rotates the screw 330. The driving source for rotating the screw 330 is not limited to the metering motor 340, and may be, for example, a hydraulic pump or the like.

[0089] The injection motor 350 moves the screw 330 forward and backward. A motion conversion mechanism that converts the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed with the screw shaft. Balls, rollers, etc. may be provided between the screw shaft and the screw nut. The driving source that moves the screw 330 forward and backward is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

[0090] The pressure detector 360 detects the force transmitted between the injection motor 350 and the screw 330. The detected force is converted into pressure by the control device 700. The pressure detector 360 is provided in the force transmission path between the injection motor 350 and the screw 330, and detects the force acting on the pressure detector 360.

[0091] The pressure detector 360 sends a signal indicating its detection result to the control device 700. The detection result of the pressure detector 360 is used to control and monitor the pressure exerted on the screw 330 by the molding material, the back pressure relative to the screw 330, and the pressure exerted on the molding material from the screw 330.

[0092] The injection device 300 performs a metering process, a filling process, a pressure-maintaining process, etc. under the control of the control device 700. The filling process and the pressure-maintaining process can be collectively referred to as an injection process.

[0093] In the metering process, the metering motor 340 is driven to rotate the screw 330 at a set speed, and the molding material is transported to the front along the spiral groove of the screw 330. As a result, the molding material is gradually melted. As the liquid molding material is transported to the front of the screw 330 and accumulated in the front part of the cylinder 310, the screw 330 is retracted. The rotation speed of the screw 330 is detected using, for example, a metering motor encoder 341. The metering motor encoder 341 detects the rotation of the metering motor 340 and sends a signal indicating the detection result to the control device 700. In addition, the screw speed detector that detects the rotation speed of the screw 330 is not limited to the metering motor encoder 341, and a conventional detector can be used.

[0094] In order to prevent the screw 330 from retreating rapidly during the metering process, the injection motor 350 may be driven to apply a set back pressure to the screw 330. The back pressure of the screw 330 is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. When the screw 330 retreats to the metering end position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering process ends.

[0095] The position and speed of the screw 330 in the metering process are uniformly set as a series of setting conditions. For example, the metering start position, the speed switching position and the metering end position are set. These positions are arranged in sequence from the front to the back, and represent the starting point and the end point of the interval for setting the speed. The speed is set for each interval. The speed switching position can be one or more. The speed switching position can also be not set. In addition, the back pressure is set for each interval.

[0096] In the filling process, the injection motor 350 is driven to make the screw 330 move forward 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, for example, an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and sends a signal indicating its detection result to the control device 700. If the position of the screw 330 reaches the set position, switching from the filling process to the pressure holding process (so-called V / P switching) is performed. The position where the V / P switching is performed is also referred to as the V / P switching position. The set moving speed of the screw 330 can be changed according to the position of the screw 330, time, etc.

[0097] The position and moving speed of the screw 330 in the filling process are uniformly set as a series of setting conditions. For example, the filling start position (also called the "injection start position"), the moving speed switching position and the V / P switching position are set. These positions are arranged in sequence from the back to the front, and indicate the start and end points of the interval for setting the moving speed. The moving speed is set for each interval. There can be one or more moving speed switching positions. It is also possible not to set the moving speed switching position.

[0098] The upper limit value of the pressure of the screw 330 is set for each interval of the moving speed of the screw 330. The pressure of the screw 330 is detected by the pressure detector 360. When the detection value of the pressure detector 360 is below the set pressure, the screw 330 moves forward at the set moving speed. On the other hand, when the detection value of the pressure detector 360 exceeds the set pressure, the screw 330 moves forward at a moving speed slower than the set moving speed for the purpose of protecting the mold so that the detection value of the pressure detector 360 becomes below the set pressure.

[0099] In addition, in the filling process, after the position of the screw 330 reaches the V / P switching position, the screw 330 can be paused at the V / P switching position and then the V / P switching can be performed. Before the V / P switching is about to be performed, the screw 330 can also be moved forward or backward at a slow speed instead of stopping the screw 330. In addition, 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 a conventional detector can be used.

[0100] In the pressure holding process, the injection motor 350 is driven to press 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, and the molding material remaining in the cylinder 310 is pushed toward the mold device 800. The insufficient amount of molding material in the mold device 800 due to cooling shrinkage can be supplemented. The holding pressure is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating its detection result to the control device 700. The set value of the holding pressure can be changed according to the elapsed time since the start of the pressure holding process, etc. The holding pressures and the holding times for maintaining the holding pressures in multiple pressure holding processes can be set separately, and can be set uniformly as a series of setting conditions.

[0101] In the pressure holding process, the molding material in the cavity space 801 in the mold device 800 is gradually cooled, and at the end of the pressure holding process, the entrance of the cavity space 801 is blocked by the solidified molding material. This state is called gate sealing, which prevents the backflow of the molding material from the cavity space 801. After the pressure holding process, the cooling process begins. In the cooling process, the molding material in the cavity space 801 is solidified. In order to shorten the molding cycle time, a metering process can be performed in the cooling process.

[0102] In addition, the injection device 300 of this embodiment is a coaxial screw type, but it can also be a screw pre-plasticization type. The injection device of the screw pre-plasticization type supplies the molding material melted in the plasticizing cylinder to the injection cylinder, and injects the molding material from the injection cylinder into the mold device. In the plasticizing cylinder, the screw is configured to be able to rotate freely and cannot move forward or backward, or the screw is configured to be able to rotate freely and move forward and backward freely. On the other hand, in the injection cylinder, the plunger is configured to move forward and backward freely.

[0103] Furthermore, the injection device 300 of the present embodiment is a horizontal type in which the axial direction of the cylinder 310 is in the horizontal direction, but it may be a vertical type in which the axial direction of the cylinder 310 is in the up-down direction. The mold clamping device combined with the vertical injection device 300 may be a vertical type or a horizontal type. Similarly, the mold clamping device combined with the horizontal injection device 300 may be a horizontal type or a vertical type.

[0104] <Mobile device>

[0105] In the description of the moving device 400, similar to the description of the injection device 300, the moving direction of the screw 330 during filling (e.g., the negative direction of the X axis) is set to the front, and the moving direction of the screw 330 during metering (e.g., the positive direction of the X axis) is set to the rear.

[0106] The moving device 400 moves the injection device 300 forward and backward relative to the mold device 800. In addition, the moving device 400 presses the nozzle 320 relative to the mold device 800 to generate nozzle contact pressure. The moving device 400 includes a hydraulic pump 410, a motor 420 as a driving source, and a hydraulic cylinder 430 as a hydraulic actuator.

[0107] The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a bidirectionally rotatable pump, and generates hydraulic pressure by sucking working fluid (e.g., oil) from one of the first port 411 and the second port 412 and discharging it from the other port by switching the rotation direction of the motor 420. In addition, the hydraulic pump 410 can also suck working fluid from a tank and discharge the working fluid from one of the first port 411 and the second port 412.

[0108] The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 with a rotation direction and a rotation torque corresponding to a control signal from the control device 700. The motor 420 may be an electric motor or an electric servomotor.

[0109] The hydraulic cylinder 430 includes a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to the injection device 300. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. The piston rod 433 is fixed to the fixed platen 110.

[0110] 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 working fluid discharged from the first port 411 is supplied to the front chamber 435 via the first flow path 401, thereby the injection device 300 is pressed forward. The injection device 300 moves forward and the nozzle 320 presses the fixed mold 810. The front chamber 435 functions as a pressure chamber that generates the nozzle contact pressure of the nozzle 320 by the pressure of the working fluid supplied from the hydraulic pump 410.

[0111] 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 via the second flow path 402, thereby pushing the injection device 300 backward. The injection device 300 retreats and the nozzle 320 is separated from the fixed mold 810.

[0112] In this embodiment, the moving device 400 includes the hydraulic cylinder 430 , but the present invention is not limited thereto. For example, an electric motor and a motion conversion mechanism that converts the rotational motion of the electric motor into the linear motion of the injection device 300 may be used instead of the hydraulic cylinder 430 .

[0113] <Control device>

[0114] The control device 700 is constituted by a computer, for example. Figure 1-2 As shown, the control device 700 has a CPU (Central Processing Unit) 701, a storage medium such as a memory 702, an input interface 703, and an output interface 704. The control device 700 makes the CPU 701 execute a program stored in the storage medium 702, thereby performing various controls. In addition, the control device 700 receives signals from the outside through the input interface 703 and sends signals to the outside through the output interface 704.

[0115] The control device 700 repeatedly manufactures molded products by repeatedly performing metering steps, mold closing steps, pressure increasing steps, mold clamping steps, filling steps, pressure holding steps, cooling steps, pressure releasing steps, mold opening steps, and ejection steps. A series of actions for obtaining molded products, such as the actions from the start of a metering step to the start of the next metering step, are also referred to as "injection" or "molding cycle". In addition, the time required for one injection is also referred to as "molding cycle time" or "cycle time".

[0116] A molding cycle includes, for example, a metering process, a mold closing process, a pressure increasing process, a mold closing process, a filling process, a pressure holding process, a cooling process, a pressure releasing process, a mold opening process, and an ejection process in sequence. The order here is the order in which each process starts. The filling process, the pressure holding process, and the cooling process are performed during the mold closing process. The start of the mold closing process may also coincide with the start of the filling process. The end of the pressure releasing process coincides with the start of the mold opening process.

[0117] In addition, in order to shorten the molding cycle time, multiple processes can be performed simultaneously. For example, the metering process can be performed during the cooling process of the previous molding cycle, or during the mold closing process. In this case, the mold closing process can also be performed at the beginning of the molding cycle. In addition, the filling process can be started during the mold closing process. In addition, the ejection process can be started during the mold opening process. When an on-off valve is set to open and close the flow path of the nozzle 320, the mold opening process can be started during the metering process. Because even if the mold opening process is started during the metering process, as long as the on-off valve closes the flow path of the nozzle 320, the molding material will not leak from the nozzle 320.

[0118] In addition, a primary molding cycle may include processes other than the metering process, the mold closing process, the pressure increasing process, the mold clamping process, the filling process, the pressure holding process, the cooling process, the pressure releasing process, the mold opening process, and the ejection process.

[0119] For example, after the pressure holding process is completed and before the metering process begins, a pre-metering suction process may be performed to retract the screw 330 to a preset metering start position. The pressure of the molding material accumulated in front of the screw 330 can be reduced before the metering process begins, and the screw 330 can be prevented from rapidly retracting when the metering process begins.

[0120] Furthermore, after the metering process is completed and before the filling process begins, a post-metering backsucking process may be performed to retract the screw 330 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 can be reduced before the filling process begins, and leakage of the molding material from the nozzle 320 can be prevented before the filling process begins.

[0121] The control device 700 is connected to an operation device 750 that receives input operations based on the user and a display device 760 that displays a display screen. The operation device 750 and the display device 760 are composed of, for example, a touch panel and can be integrated into one. The touch panel as the display device 760 displays a display screen under the control of the control device 700. Information such as the settings of the injection molding machine 10 and the current state of the injection molding machine 10 can be displayed on the display screen of the touch panel. In addition, input operation parts such as buttons and input fields that receive input operations based on the user can be displayed on the display screen of the touch panel. The touch panel as the operation device 750 detects input operations based on the user on the display screen and outputs a signal corresponding to the input operation to the control device 700. Thus, for example, the user can confirm the information displayed on the display screen while operating the input operation part set on the display screen to set the injection molding machine 10 (including input of set values). In addition, the user operates the input operation part set on the display screen, thereby enabling the injection molding machine 10 to operate corresponding to the input operation part. In addition, the operation of the injection molding machine 10 may be, for example, the operation (including stopping) of the mold clamping device 100, the ejection device 200, the injection device 300, and the moving device 400. Furthermore, the operation of the injection molding machine 10 may be the switching of the display screen displayed on the touch panel as the display device 760.

[0122] In addition, the operating device 750 and the display device 760 of this embodiment are described as an example in which they are integrated as a touch panel, but they can also be provided independently. In addition, a plurality of operating devices 750 can be provided. The operating device 750 and the display device 760 are arranged on the operating side (negative direction of the Y axis) of the mold clamping device 100 (more specifically, the fixed platen 110).

[0123] [Details of the ejector device]

[0124] Next, refer to Figure 3 to Figure 5 The ejection device 200 will be described in detail.

[0125] Figure 3 It is a front perspective view showing an example of the ejection device 200 according to the present embodiment. Figure 4 It is a rear perspective view showing an example of the ejection device 200 according to the present embodiment. Figure 5 It is a plan cross-sectional view showing an example of the ejection device 200 according to the present embodiment.

[0126] The ejection device 200 includes an ejection rod 210 , a driving mechanism 220 , a support body 230 , a guide rod 240 , and a crosshead 250 .

[0127] The ejector rod 210 (an example of a pressurizing mechanism) is fixed to the cross head 250. The ejector rod 210 is arranged to be able to move forward and backward in the through hole 121 of the movable platen 120. Thus, by moving the cross head 250 forward and backward in the X direction, the ejector rod 210 can be moved forward and backward.

[0128] The driving mechanism 220 includes an ejection motor 221 , a motor pulley 222 , a belt 223 , a screw shaft pulley 224 , and a motion conversion mechanism 225 . The motion conversion mechanism 225 includes a screw shaft 226 and a screw nut 227 .

[0129] The support body 230 is fixed to the rear end of the movable platen 120. Specifically, the support body 230 is fixed in a manner to close the open end of the hollow portion of the movable platen 120. The support body 230 rotatably supports one end of the screw shaft 226 via a bearing. The screw shaft 226 is arranged in the hollow portion of the movable platen 120 so as to extend along the X direction between the support body 230 and the front end portion (the end portion in the positive direction of the X axis) of the movable platen 120, and the other end is rotatably supported by the movable platen 120.

[0130] The guide rod 240 is arranged in the interior (hollow portion) of the movable platen 120 so as to extend between the support body 230 and the front end of the movable platen 120 in the X direction. One end of the guide rod 240 is fixed to the support body 230 and the other end is fixed to the front end of the movable platen 120.

[0131] The crosshead 250 is provided in the hollow portion of the movable platen 120 so as to be movable in the X direction between the support body 230 and the front end portion of the movable platen 120. The screw shaft 226 and the guide rod 240 penetrate the crosshead 250. Thus, the crosshead 250 can move in the X direction along the guide rod 240 in the hollow portion of the movable platen 120.

[0132] The ejector motor 221 (an example of a driver) is fixed to the support body 230 .

[0133] The motor pulley 222 is fixed to the rotating shaft of the ejection motor 221 .

[0134] The belt 223 is provided between the motor pulley 222 and the screw shaft pulley 224 , and transmits the rotation of the motor pulley 222 to the screw shaft pulley 224 .

[0135] The screw shaft pulley 224 is fixed to the screw shaft 226 .

[0136] The motion conversion mechanism 225 converts the rotational motion of the screw shaft 226 into the forward and backward motion of the screw nut 227 in the front-rear direction.

[0137] As described above, the screw shaft 226 is rotatably supported by the support body 230 and the front end portion of the movable platen 120 .

[0138] The screw nut 227 is threadedly engaged with the screw shaft 226 and is fixed to the cross head 250 .

[0139] The ejector device 200 operates the ejector motor 221, and the screw shaft 226 rotates via the motor pulley 222, the belt 223, and the screw shaft pulley 224. As the screw shaft 226 rotates, the crosshead 250 to which the screw nut 227 is fixed moves in the front-to-back direction, thereby enabling the ejector rod 210 to move forward and backward. As a result, during the ejection process, the ejector device 200 advances the ejector rod 210, and the ejector rod 210 presses the movable component 830 forward, and as a result, the ejector pin 831 of the movable component 830 can eject the molded product. Furthermore, during the injection process, the ejector device 200 advances the ejector rod 210, and the ejector rod 210 presses the movable component 830, and as a result, the compression core pin 832 (reference number 832) described later and provided on the movable component 830 is moved forward. Figure 6 , Figure 7 ) can compress the molding material in the cavity space 801. That is, the ejection device 200 can perform ejection compression.

[0140] The ejector motor 221 is controlled by the control device 700. Specifically, the ejector motor 221 is provided with an ejector motor encoder 221a for detecting the rotation thereof, and the control device 700 can control the ejector motor 221 based on the output of the ejector motor encoder 221a and the like.

[0141] [Ejection compression]

[0142] Next, refer to Figure 6 , Figure 7 The details of the ejection compression by the ejection device 200 will be described.

[0143] Figure 6 It is a side cross-sectional view showing the state of the movable member 830 before the start of ejection compression. Figure 7 It is a side cross-sectional view showing the state of the movable member 830 during ejection compression.

[0144] like Figure 6 , Figure 7 As shown, the movable member 830 (also referred to as an "ejector plate") is a plate-shaped member perpendicular to the front-rear direction, and is arranged inside the movable mold 820 (hollow portion) so as to be able to move forward and backward freely.

[0145] A guide shaft 834 is provided inside the movable mold 820, and a ball retainer 835 connected to the guide shaft 834 is provided in the movable member 830. Thus, the movable member 830 is configured to be able to move forward and backward freely along the axial direction of the guide shaft 834. The number of combined guide shafts 834 and ball retainers 835 is, for example, 4 sets. In addition, the number of combined guide shafts 834 and ball retainers 835 may be 3 or less, or 5 or more.

[0146] A spring 836 is provided between the movable member 830 and the opposing surface of the movable member 830 in the advancing and retreating direction (hereinafter referred to as the "opposing surface") inside the movable mold 820. Thus, the movable member 830 is configured to be pushed toward the ejector rod 210 and retreated by the elastic restoring force of the spring 836.

[0147] The front end of the ejector rod 210 can pass through the through hole provided in the movable mold 820 and abut against the movable member 830. In addition, a force sensor can also be provided in the ejector rod 210. The force sensor detects the pressure applied to the ejector rod 210, and a signal corresponding to the detection result is input to the control device 700.

[0148] The movable member 830 is provided with an ejector pin 831 , a compression core pin 832 , a contact pin 833 , and the like.

[0149] The ejector pin 831 is a rod-shaped member extending forward from the plate-shaped movable member 830. Specifically, the ejector pin 831 extends forward from the movable member 830 and passes through a through hole provided in the movable mold 820 (opposing surface). The molding material MM flowing in the flow channel 803 surrounds and solidifies at the front end of the ejector pin 831. The ejector pin 831 advances and retreats together with the movable member 830, and is used to eject the molding material MM that has solidified in the flow channel 803.

[0150] The compression core pin 832 is a rod-shaped member extending forward from the plate-shaped movable member 830. Specifically, the compression core pin 832 extends forward from the movable member 830 and passes through a through hole provided in the movable mold 820 (opposing surface). The front end surface of the compression core pin 832 constitutes a part of the wall surface of the cavity space 801. The compression core pin 832 moves forward and backward together with the movable member 830, and is used for ejection compression of the molding material MM, decompression of the compressed molded product, and ejection of the decompressed molded product.

[0151] The abutment pin 833 is a rod-shaped component extending forward from the plate-shaped movable component 830. Specifically, the abutment pin 833 extends forward from the movable component 830 and penetrates a through hole provided in the movable mold 820 (opposing surface). When the movable component 830 is advanced to a certain extent by the ejection rod 210 during ejection compression, the front end of the abutment pin 833 abuts against the end surface of the fixed mold 810 (i.e., the mating surface with the movable mold 820). Thus, the position of the compression core pin 832 during ejection compression is determined. That is, when the ejection compression is performed, the abutment pin 833 functions as a mechanical end of the movable component 830 together with the fixed mold 810. In addition, other positioning components that function as mechanical ends may be provided instead of the abutment pin 833. For example, a component that limits the amount of movement of the movable component 830 in the advancing direction may be provided between the opposing surfaces inside the movable component 830 and the movable mold 820.

[0152] The ejector device 200 is controlled by the control device 700 to eject and compress the molding material MM filled in the cavity space 801 of the mold device 800 and to eject the molded product from the mold device 800 by the ejector compression. The ejector compression of the molding material MM is performed before the molding material MM is completely solidified.

[0153] like Figure 6 As shown, in the injection process of the injection device 300, the molding material MM injected from the injection device 300 reaches the cavity space 801 via the gate 802 formed on the fixed mold 810, the runner 803 branched at the terminal part of the gate 802, and the gate 804 set at the terminal part of the runner 803.

[0154] like Figure 7 As shown, in accordance with the filling of the molding material MM, the ejector device 200 advances the ejector rod 210, makes the front end thereof contact with the movable member 830, and advances the movable member 830. Then, the contact pin 833 that is linked with the movable member 830 contacts the fixed mold 810, and the forward movement of the ejector rod 210 and the movable member 830 is restricted, and ejection compression is performed in a state where the compression core pin 832 is positioned.

[0155] [Control method related to ejection compression]

[0156] Next, refer to Figure 8 , Fig. 9 A method of controlling the ejector device 200 related to ejection compression by the control device 700 will be described.

[0157] <Control method related to ejection compression according to comparative example>

[0158] Figure 8The timing charts 81 to 83 show the operation status of the injection molding machine according to the comparative example during ejection compression. Hereinafter, the same or corresponding components of the injection molding machine according to the comparative example as the injection molding machine 10 of the present embodiment will be given the same names without any reference numerals.

[0159] The timing chart 81 shows the temporal change of the pressure in the cavity space of the mold device (hereinafter, “mold internal pressure”) during ejection compression of the injection molding machine according to the comparative example.

[0160] The timing chart 82 shows the temporal change of the control instruction (hereinafter, “position instruction”) regarding the position of the ejector device in the forward and backward directions outputted from the control device of the injection molding machine according to the comparative example.

[0161] The timing chart 83 shows the temporal change in the output torque of the ejector motor of the injection molding machine according to the comparative example.

[0162] As shown in the timing diagram 81, the mold internal pressure of the mold device increases at a relatively high rate of change and reaches the maximum pressure during a certain period of time after the molding material starts to be filled into the cavity space. After that, the mold internal pressure of the mold device gradually decreases with the completion of the injection process and the progress of the solidification of the molding material.

[0163] The control device of the injection molding machine according to the comparative example outputs a position instruction to the ejector motor to perform position feedback control, and outputs a torque instruction to the ejector motor to perform torque feedback control.

[0164] As shown in the timing diagram 82, the control device outputs a position indication indicating a predetermined position (for example, a position where the ejector rod contacts the movable member) for a certain period of time as the first stage. Thereafter, the control device transitions to a state of outputting a position indication indicating a predetermined position corresponding to the final ejection compression as the second stage, so as to match the increase in the mold internal pressure, and to continue this state during the ejection compression process. Thus, the rotational position of the ejector motor is controlled so that the front end of the core compression pin can stop at the standard position for ejection compression.

[0165] Specifically, as the second stage, the control device can output a position indication corresponding to the same position as the stop position (standard position) of the front end portion of the core compression pin based on the function of the mechanical end of the abutment pin and the fixed mold combination. In addition, the control device can also output a position indication corresponding to a position further forward than the stop position of the front end portion of the core compression pin based on the function of the mechanical end. The position indication can take into account (addition) the shortage caused by the deformation (bending) of the compression core pin described later relative to the standard position. In addition, in addition to the above-mentioned shortage relative to the standard position, the position indication can also take into account (addition) a further advance amount. Thus, the control device can push the abutment pin toward the fixed mold and reliably maintain the front end position of the compression core pin at the standard position.

[0166] Furthermore, the control device outputs a torque instruction in such a manner that the rotational position of the ejector motor is aligned with the position specified by the position instruction, and controls the ejector motor. The control device outputs a torque instruction of a relatively low value for a certain period of time based on the position instruction of the first stage. Thereafter, the control device transitions to a state of outputting a torque instruction of a relatively high value based on the position instruction of the second stage so as to match the increase in the mold internal pressure, and continues this state during the ejection compression process. The value of the torque instruction of the second stage (hereinafter, "torque instruction value") is set to a very high value relative to the maximum value of the mold internal pressure to prevent the movable part (compression core pin) from retreating and moving from the standard position.

[0167] For example, as described above, the control device controls the ejector motor based on a position indication corresponding to a position that is further forward than the stop position of the front end portion of the core compression pin based on the function of the mechanical end. In this case, in reality, the rotational position of the ejector motor cannot reach the position indicated by the position indication. Therefore, the torque indication value continues to rise in order to align the actual position of the ejector motor with the position indicated by the position indication, and reaches the upper limit value (hereinafter, "torque limit") of the output torque of the ejector motor. When the generated torque indication value exceeds the torque limit, the control device limits the torque indication value actually output to the torque limit value. Therefore, the control device continues to output a torque indication specified as the torque limit value during the core compression process. As a result, as shown in the timing diagram 83, the output torque of the ejector motor rises in stages at a relatively large rate of change, and is maintained at a very high, substantially constant value during the ejection compression process.

[0168] For example, when the ejector rod is advanced to compress the molding material in the cavity space, the movable part and the transmission part may be elastically deformed due to the reaction force (load) based on the molding material. Specifically, at least a part of the elongation of the belt, the deformation of the movable part, the deformation of the ejector pin, the deformation of the compression core pin, the deformation of the ejector rod, the deformation of the crosshead, and the deformation of the screw shaft may occur. Therefore, the actual front end position of the compression core pin may be further back than the front end position of the compression core pin obtained by the detection value of the ejector motor encoder. Therefore, as described above, the control device of the injection molding machine involved in the comparative example outputs a position indication corresponding to a position further forward than the standard position, and as a result, a very high torque (specifically, a torque equivalent to the torque limit) is continuously output from the ejector motor. As a result, the displacement of the front end position of the compression core pin caused by the reaction force of the molding material can be suppressed. Therefore, by the function of the mechanical end based on the abutment pin and the fixed mold combination, the front end position of the compression core pin can be maintained at the standard position.

[0169] On the other hand, the ejector motor continues to output a very high torque. Therefore, for example, the cumulative value of the output current corresponding to the output torque exceeds a predetermined reference and may fall into an overload state. As a result, the injection molding machine involved in the comparative example stops abnormally, which may cause a decrease in its working efficiency.

[0170] <Control Method Related to Ejector Compression According to the Present Embodiment>

[0171] Fig. 9 These are timing charts 91 to 93 showing the operation conditions during ejection compression according to the present embodiment.

[0172] The timing chart 91 shows the temporal change of the mold internal pressure in the cavity space 801 of the mold device 800 during the ejection compression of the injection molding machine 10 according to the present embodiment.

[0173] The timing chart 92 shows the temporal change of the position instruction output from the control device 700 of the injection molding machine 10 according to the present embodiment.

[0174] The timing chart 93 shows the temporal change of the output torque of the ejector motor 221 of the injection molding machine 10 according to the present embodiment.

[0175] The timing charts 91 and 92 are the same as the timing charts 81 and 82 of the comparative example, and thus their description is omitted.

[0176] Similar to the case of the injection molding machine according to the comparative example, the control device 700 outputs a position instruction to the ejector motor 221 to perform position feedback control, and outputs a torque instruction to the ejector motor 221 to perform torque feedback control.

[0177] The control device 700 outputs a torque indication in such a manner that the rotational position of the ejector motor 221 is aligned with the position specified by the position indication, and controls the ejector motor 221. The control device 700 outputs a torque indication of a relatively low value for a certain period of time based on the position indication of the first stage. Thereafter, the control device 700 transitions to a state of outputting a torque indication of a relatively high value based on the position indication of the second stage so as to match the increase in the mold internal pressure, and continues this state during the ejection compression process. As in the case of the comparative example, the torque indication value of the second stage is set to a very high value (hereinafter, "high torque value") relative to the maximum value of the mold internal pressure to prevent the movable member 830 (compression core pin 832) from retreating and moving from the standard position.

[0178] As in the case of the comparative example, the control device 700 controls the ejector motor 221, for example, based on a position indication corresponding to a position further forward than the stop position of the front end portion of the core compression pin based on the function of the mechanical end. In this case, in reality, the rotation position of the ejector motor 221 cannot reach the position indicated by the position indication. Therefore, the torque indication value continues to rise in order to align the actual position of the ejector motor 221 with the position indicated by the position indication, and reaches the torque limit (high torque value) of the ejector motor. When the generated torque indication value exceeds the torque limit, the control device 700 limits the torque indication value actually output to the torque limit value. Therefore, the control device 700 continuously outputs a torque indication specified as the torque limit value during the core compression process. As a result, as shown in the timing diagram 93, the output torque of the ejector motor 221 rises to a very high value (the normal torque limit of the ejector motor 221) in stages at a relatively large rate of change.

[0179] After the control device 700 sets the torque instruction value to the high torque value, the torque instruction value is changed according to a predetermined control curve (hereinafter, "control torque curve") according to a predetermined trigger. For example, the control device 700 may generate a torque instruction value so that the torque of the ejector motor 221 changes (decreases) after a predetermined delay time (for example, a high torque maintenance period P1 described later) has passed since the predetermined trigger.

[0180] The prescribed trigger may be, for example, the start of a filling process. Furthermore, the prescribed trigger may be, for example, the high torque value of the output torque of the ejector motor 221. Furthermore, the prescribed trigger may be the same as the start trigger of the ejection compression process. Furthermore, the prescribed trigger may be the start of the pressure holding process. Furthermore, the prescribed trigger may also be prescribed according to the position of the injection device 300 (screw 330). Furthermore, the prescribed trigger may also be the timing of the V / P switching. Furthermore, the prescribed trigger may also be the reception of an external signal input from the outside of the injection molding machine 10. The external signal may be output from, for example, an external device related to the mold device 800. The external device may be, for example, a mold internal pressure sensor provided in the mold device 800. In this case, the external signal corresponding to the prescribed trigger may be output, for example, at the timing when the mold internal pressure of the mold device 800 decreases from the peak value.

[0181] Specifically, the control device 700 maintains the torque instruction value at a high torque value (an example of a first torque value) during a period P1 from time t1 to time t2 corresponding to a specified trigger (hereinafter, "a high torque maintenance period"). Thereafter, the control device 700 reduces the torque instruction value from the high torque value to a relatively low value (hereinafter, "a low torque value") (an example of a second torque value) at a constant rate of change relative to the passage of time during a period P2 from time t2 to time t3 (hereinafter, "a torque reduction period") . Furthermore, the control device 700 may also reduce the torque instruction value at a variable rate of change relative to the passage of time. Thereafter, the control device 700 maintains the torque instruction value at a low torque value during a period P3 from time t3 to the end of the ejection compression process (hereinafter, "a low torque maintenance period") .

[0182] For example, the control device 700 can realize the control torque curve by making the torque limit of the ejector motor 221 variable. That is, the control torque curve may be a control curve related to the torque limit of the ejector motor 221 in the core compression process.

[0183] The control device 700 maintains the torque limit of the ejector motor 221 at the normal torque limit value during the high torque maintenance period P1 starting from the predetermined trigger. As a result, the torque instruction value is maintained at a relatively high normal torque limit value (high torque value), and the output torque of the ejector motor 221 is maintained at the normal torque limit value (high torque value) under the control of the control device 700.

[0184] Furthermore, the control device 700 reduces the torque limit of the ejector motor 221 from the normal torque limit value (high torque value) to a relatively low value (low torque value) during the torque reduction period P2. Thus, the torque instruction value is maintained at the torque limit value that is variable in the decreasing direction with respect to the passage of time, and the torque of the ejector motor 221 is reduced from the high torque value to the low torque value under the control of the control device 700.

[0185] Furthermore, the control device 700 maintains the torque limit of the ejector motor 221 at a low torque value lower than the normal torque limit value during the low torque maintenance period P3. As a result, the torque instruction value is maintained at a low torque value, and the output torque of the ejector motor 221 is maintained at a low torque value under the control of the control device 700.

[0186] Thus, as shown in the timing diagram 93, the output torque of the ejector motor 221 is maintained at a very high state (high torque value state) during the period from time t1 to time t2, which corresponds to a relatively high mold internal pressure of the mold device 800. Therefore, the displacement of the front end position of the compression core pin 832 caused by the reaction force of the molding material is suppressed, and the front end position of the compression core pin 832 can be maintained at a standard position by the function of the mechanical end based on the combination of the abutment pin 833 and the fixed mold 810.

[0187] The output torque of the ejector motor 221 decreases from a high torque value state to a low torque value state during the period from time t2 to time t3. Moreover, the output torque of the ejector motor 221 is maintained at a low torque value state after time t3. This is because, as shown in the timing diagram 91, the mold internal pressure of the mold device 800 gradually decreases from before time t2, and the output torque required to maintain the position of the compression core pin 832 at the standard position decreases. Therefore, the injection molding machine 10 involved in this embodiment can suppress the situation where the cumulative value of the output current corresponding to the output torque exceeds the prescribed reference as in the case of the comparative example.

[0188] In this way, the control device 700 sets the control torque curve of the ejector motor 221 according to the variation curve of the physical quantity related to the force that overcomes the driving of the ejector motor 221, specifically, the variation curve of the mold internal pressure of the mold device 800. As a result, the injection molding machine 10 involved in this embodiment can suppress the situation where the position of the compression core pin 832 deviates from the standard position, and suppress the reduction of the working efficiency caused by the overload abnormality of the ejector motor 221. That is, the control device 700 controls the torque of the ejector motor 221 according to the variation curve of the mold internal pressure of the mold device 800, and maintains the position of the ejector device 200 (compression core pin 832).

[0189] The control torque curve can be automatically set, for example, based on the variation curve of the mold internal pressure of the mold device 800. Specifically, the control torque curve can be set so as to have the same value as or a value greater than the torque curve that is balanced with the variation curve of the mold internal pressure of the mold device 800, according to the passage of time. Information related to the variation curve of the mold internal pressure of the mold device 800 can be obtained in advance, for example, through experiments, simulation analysis, etc., and pre-registered in an auxiliary storage device or the like inside the control device 700. In addition, information related to the variation curve of the mold internal pressure of the mold device 800 can also be obtained based on actual measurement values ​​obtained by a mold internal pressure sensor provided in the mold device 800.

[0190] Furthermore, the control torque curve may be manually set, for example, based on the change curve of the mold internal pressure of the mold device 800 through the user's operation input to the operation device 750 (see the following description). Fig.10 ).

[0191] Furthermore, the control torque curve may be set, for example, based on a torque curve that is balanced with the variation curve of the mold internal pressure of the mold device 800, that is, a torque curve of the lower limit of the allowance of the ejector motor 221 for overcoming the variation curve of the mold internal pressure of the mold device 800 (hereinafter, "lower limit torque curve of allowance"). Specifically, the control torque curve may be set by adding a predetermined margin to the lower limit torque curve of allowance. The predetermined margin may be set automatically or manually by the user.

[0192] Furthermore, the control torque curve may be set, for example, based on a torque curve of an upper limit allowable for the overload state of the ejector motor 221 (hereinafter, "an upper limit allowable torque curve"). Specifically, the control torque curve is set, for example, by subtracting a predetermined margin from the upper limit allowable torque curve. At this time, the predetermined margin is set so that a part of the set control torque curve does not fall below the lower limit allowable torque curve. Furthermore, the predetermined margin may be set automatically or manually by the user.

[0193] Furthermore, the control device 700 may set the control torque curve of the ejector motor 221 according to the variation curve of the injection pressure of the injection device 300 instead of or in addition to the variation curve of the mold internal pressure. This is because the torque required to maintain the compression core pin 832 at the standard position changes according to the injection pressure of the injection device 300 during the injection process.

[0194] [Control torque curve related setting screen]

[0195] Next, refer to Fig.10A description will be given of a setting screen for setting a control torque curve of the ejector motor 221 during ejection compression by the control device 700 .

[0196] Fig.10 1000 is a diagram showing an example of a setting screen related to a control torque curve displayed on the display device 760 (setting screen 1000 ).

[0197] like Fig.10 As shown, in this example, as described above, the following control torque curve is set, that is, during the high torque maintenance period P1, the torque instruction value is maintained constant at a high torque value, during the torque reduction period P2, the torque instruction value decreases from the high torque value to the low torque value at a constant rate of change relative to the passage of time, and during the low torque maintenance period P3, the torque instruction value is maintained constant at a low torque value.

[0198] The setting screen 1000 includes a control torque curve image 1010 and setting input units 1020 , 1030 , 1040 , 1050 , and 1060 .

[0199] The control torque curve image 1010 is an image showing the control torque curve set in the setting screen 1000. Specifically, the control torque curve image 1010 schematically shows a curve showing changes in the torque instruction value of the ejector motor 221 with respect to the elapse of time starting from a predetermined trigger.

[0200] The setting input unit 1020 is a part for setting and inputting a high torque value corresponding to the torque instruction value during the high torque maintenance period P1 through the operating device 750. The setting input unit 1020 includes text information of "high torque setting" and a text box for inputting a numerical value corresponding to the high torque value. In this example, the user can input the high torque value to be set in the text box as a percentage (%) of the maximum torque of the ejector motor 221. In the figure, a high torque value of 90% of the maximum torque of the ejector motor 221 is set and input.

[0201] The setting input unit 1030 is a part for setting and inputting a low torque value corresponding to the torque instruction value of the low torque maintenance period P3 through the operating device 750. The setting input unit 1030 includes text information of "low torque setting" and a text box for inputting a numerical value corresponding to the low torque value. In this example, the user can input the low torque value to be set in the text box as a percentage (%) of the maximum torque of the ejector motor 221. In the figure, a low torque value of 30% of the maximum torque of the ejector motor 221 is set and input.

[0202] The setting input unit 1040 is a part for setting and inputting the length of the high torque maintenance period P1. As described above, the starting point of the high torque maintenance period P1 can be, for example, the timing generated by a specified trigger. The setting input unit 1040 includes text information of "high torque time" and a text box for inputting a numerical value corresponding to the length of the high torque maintenance period P1. In this example, the user can input the length of the high torque maintenance period P1 to be set in seconds ("sec") based on the timing of a specified trigger, etc. In the figure, 2 seconds are set as the length of the high torque maintenance period P1.

[0203] The setting input unit 1050 is a part for setting and inputting the length of the torque reduction period P2. The setting input unit 1050 includes text information of "reduction time" and a text box for inputting a numerical value corresponding to the length of the torque reduction period P2. In this example, the user can input the length of the torque reduction period P2 to be set in seconds ("sec"). In the figure, 10 seconds is set as the length of the torque reduction period P2.

[0204] The setting input unit 1060 is a part for setting input (selecting) the on (open) / off (off) of the control function of the ejector motor 221 based on the control torque curve set in the setting screen 1000. The setting input unit 1060 includes text information of "torque limit function" and a text box for inputting (selecting) either on / off. Thus, the user can personally select whether to make the control device 700 execute the control function of the ejector motor 221 based on the control torque curve set in the setting screen 1000 when performing ejection compression. In the figure, the setting input of the control function of the ejector motor 221 based on the control torque curve set in the setting screen 1000 is in the "on" state.

[0205] In this way, the display device 760 displays the setting screen 1000 based on the physical quantity related to the force that overcomes the driving of the ejector motor 221, that is, the change curve of the mold internal pressure of the mold device 800. Thus, the user can manually set and input the control torque curve based on the change curve of the mold internal pressure of the mold device 800.

[0206] Furthermore, when the setting input in the setting screen 1000 contains content that does not match the mold internal pressure curve of the mold device 800, this fact can also be displayed. The content that does not match the mold internal pressure curve of the mold device 800 refers to the content of the control torque curve that corresponds to at least a part of the time change that is lower than the lower limit torque curve of the ejector motor 221 that can overcome the mold internal pressure curve. For example, under the control of the control device 700, the display device 760 can change the text box of the setting input part 1020, 1030, 1040, 1050 where the content that does not match the mold internal pressure curve of the mold device 800 is input to a color different from the usual color (for example, red). Thus, under the control of the control device 700, the display device 760 can make the user aware that the content of the current setting input is not appropriate.

[0207] Furthermore, when the content that the ejector motor 221 may fall into an overload abnormality is inputted in the setting screen 1000, this fact may be displayed. For example, under the control of the control device 700, the display device 760 may change the text boxes of the setting input parts 1020, 1030, 1040, and 1050 where the content that the ejector motor 221 may fall into an overload abnormality is inputted to a color different from the usual color (for example, red). Thus, under the control of the control device 700, the display device 760 can make the user aware that the content of the current setting input is not appropriate.

[0208] Furthermore, in addition to the control torque curve image 1010, an image showing the mold internal pressure curve of the mold device 800 or the lower limit torque curve of the ejector motor 221 corresponding to the mold internal pressure curve may be displayed on the setting screen 1000. In this case, the curve shape of the control torque curve of the control torque curve image 1010 may also be changed according to the content of the setting input to the setting input parts 1020, 1030, 1040, and 1050. Thus, the user can set and input an appropriate control torque curve while checking the mold internal pressure curve of the mold device 800 and the lower limit torque curve of the ejector motor 221.

[0209] [Transformation, Change]

[0210] Although the embodiments have been described above, the present invention is not limited to the specific embodiments, and various modifications and changes can be made within the scope of the gist described in the claims.

[0211] For example, in the above-mentioned embodiment, a pattern based on a concave-convex shape may be formed at the front end of the compression core pin 832, and the pattern may be transferred to the molding material by ejection compression. That is, the injection molding machine 10 may perform ejection compression for the purpose of transfer, and may omit the function of the mechanical end according to the method. This is because, in the case of ejection compression for the purpose of transfer, strict positioning of the front end of the compression core pin 832 is sometimes not required. In this case, as in the case of the above-mentioned embodiment, the control device 700 may set the control torque curve of the ejection motor 221 according to the variation curve of the mold internal pressure and the injection pressure of the mold device 800.

[0212] For example, if the torque of the ejector motor 221 is relatively small relative to the mold internal pressure of the mold device 800, the pattern of the front end portion of the core pin 832 compressed by the retreat from the molding material may not be well transferred to the molding material. On the other hand, if the ejector motor 221 continues to output a relatively high torque in order to overcome the retreat from the molding material, it may fall into an overload state and cause the injection molding machine 10 to stop abnormally.

[0213] On the other hand, as described above, the control device 700 can suppress the failure of transfer to the molding material and suppress the reduction of the working efficiency due to the overload abnormality of the ejector motor 221 by setting the control torque curve of the ejector motor 221 .

[0214] Furthermore, in the above-mentioned embodiment and the modified example, the ejector device 200 may also have a structure related to the mold gate cutting (an example of a pressurizing mechanism) and perform the mold gate cutting. In this case, as in the case of the above-mentioned embodiment, the control device 700 may set the control torque curve of the ejector motor 221 based on the variation curve of the physical quantity related to the force that overcomes the driving of the ejector motor 221. The physical quantity related to the force that overcomes the driving of the ejector motor 221 may be, for example, the reaction force of the solidified molding material in the gate portion acting on the gate cutting blade tip when performing the mold gate cutting. In cutting the solidified molding material, a relatively large reaction force acts on the blade tip, and a relatively high torque of the ejector motor 221 is required. On the other hand, if the cutting is completed, the reaction force does not act on the blade tip, and the relatively high torque of the ejector motor 221 is not required.

[0215] For example, if the torque of the ejector motor 221 is relatively small relative to the strength of the solidified molding material, gate cutting may not be achieved due to the retreat from the solidified molding material. On the other hand, if the ejector motor 221 continues to output a relatively high torque in order to overcome the retreat from the solidified molding material, it may fall into an overload state and cause the injection molding machine 10 to stop abnormally.

[0216] On the other hand, as described above, the control device 700 can appropriately execute the mold gate cutting by setting the control torque curve of the ejector motor 221 and suppress the reduction of the working efficiency caused by the overload abnormality of the ejector motor 221.

[0217] Furthermore, in the above-mentioned embodiment and the modified example, a core puller device (an example of a pressurizing device) may be provided in the injection molding machine 10 to perform core compression. In this case, similarly to the above-mentioned embodiment, the control device 700 may set a control torque curve of a driver (e.g., a core puller motor) that drives the core puller device based on a variation curve of the mold internal pressure and the injection pressure of the mold device 800.

[0218] For example, if the output torque of the driver driving the movable core (an example of a pressurizing mechanism) of the core puller device is relatively small relative to the mold internal pressure of the mold device 800, the position of the front end of the movable core may deviate from the appropriate position due to the retreat from the molding material. On the other hand, if the driver continues to output a relatively high torque in order to overcome the retreat from the molding material, it may fall into an overload state and cause the injection molding machine 10 to stop abnormally.

[0219] In contrast, as described above, the control device 700 can suppress the situation in which the position of the front end of the movable core deviates from the appropriate position by setting the control torque curve of the driver of the drive core traction device (movable core), and can suppress the reduction in working efficiency caused by the overload abnormality of the driver.

Claims

1. An injection molding machine comprising: A pressurizing device, comprising a pressurizing mechanism for pressurizing the molding material filled in the mold device before the molding material is solidified, and a driver for driving the pressurizing mechanism; a stopper to which a portion of the pressurizing mechanism is pressed so as to prevent a position deviation of a front end portion of the pressurizing mechanism that pressurizes the molding material due to retreat from the molding material when the molding material is pressurized by the pressurizing mechanism and the driver; A control device for controlling the pressurizing device; and display device, The display device displays a screen for setting so that the torque of the driver when the pressurizing mechanism is pressed against the stopper in order to pressurize the molding material by the pressurizing mechanism decreases according to the elapsed time; In the screen, a first setting input, a second setting input or a third setting input can be made, the first setting input being related to the magnitude of the torque or the maintenance period of the first control state in which the torque of the driver is maintained at a relatively high torque, the second setting input being related to the magnitude of the torque in the second control state in which the torque of the driver is maintained at a relatively low torque, and the third setting input being related to the method of changing the torque when the torque of the driver is transferred from the first control state to the second control state.

2. An injection molding machine comprising: A pressurizing device, comprising a pressurizing mechanism for pressurizing the molding material filled in the mold device before the molding material is solidified, and a driver for driving the pressurizing mechanism; a stopper to which a portion of the pressurizing mechanism is pressed so as to prevent a position deviation of a front end portion of the pressurizing mechanism that pressurizes the molding material due to retreat from the molding material when the molding material is pressurized by the pressurizing mechanism and the driver; A control device for controlling the pressurizing device; and display device, The display device displays a screen for setting a control curve of the driver based on the control device, based on a variation curve of a physical quantity related to a force that overcomes the driving of the driver, so that the torque of the driver when the pressurizing mechanism is pressed against the stopper in order to pressurize the molding material by the pressurizing mechanism decreases in accordance with the elapsed time; The control device sets the control curve related to the torque of the driver based on the torque curve of the driver for overcoming the lower limit of the allowable torque of the driver of the variation curve.

3. An injection molding machine comprising: A pressurizing device, comprising a pressurizing mechanism for pressurizing the molding material filled in the mold device before the molding material is solidified, and a driver for driving the pressurizing mechanism; a stopper to which a portion of the pressurizing mechanism is pressed so as to prevent a position deviation of a front end portion of the pressurizing mechanism that pressurizes the molding material due to retreat from the molding material when the molding material is pressurized by the pressurizing mechanism and the driver; A control device for controlling the pressurizing device; and display device, The display device displays a screen for setting a control curve of the driver based on the control device based on a variation curve of a physical quantity related to the force for overcoming the driving of the driver, so that the torque of the driver when the pressurizing mechanism is pressed against the stopper in order to pressurize the molding material by the pressurizing mechanism decreases accordingly with the elapsed time; the control device sets the control curve related to the torque of the driver based on a torque curve of an allowable upper limit relative to an overload state of the driver.

4. An injection molding machine comprising: A pressurizing device, comprising a pressurizing mechanism for pressurizing the molding material filled in the mold device before the molding material is solidified, and a driver for driving the pressurizing mechanism; a stopper to which a portion of the pressurizing mechanism is pressed so as to prevent a position deviation of a front end portion of the pressurizing mechanism that pressurizes the molding material due to retreat from the molding material when the molding material is pressurized by the pressurizing mechanism and the driver; A control device for controlling the pressurizing device; and display device, The display device displays a screen for setting a control curve of the driver based on the control device, based on a variation curve of a physical quantity related to a force that overcomes the driving of the driver, so that the torque of the driver when the pressurizing mechanism is pressed against the stopper in order to pressurize the molding material by the pressurizing mechanism decreases in accordance with the elapsed time; The control device sets the control curve for maintaining the upper limit of the torque of the driver at a relatively high first torque value, then reducing the torque from the first torque value to a relatively low second torque value and maintaining the torque at the second torque value.

5. An injection molding machine comprising: A pressurizing device, comprising a pressurizing mechanism for pressurizing the molding material filled in the mold device before the molding material is solidified, and a driver for driving the pressurizing mechanism; a stopper to which a portion of the pressurizing mechanism is pressed so as to prevent a position deviation of a front end portion of the pressurizing mechanism that pressurizes the molding material due to retreat from the molding material when the molding material is pressurized by the pressurizing mechanism and the driver; A control device for controlling the pressurizing device; and display device, The display device displays a screen for setting so that the torque of the driver when the pressurizing mechanism is pressed against the stopper in order to pressurize the molding material by the pressurizing mechanism decreases according to the elapsed time; The control device maintains the upper limit of the torque of the driver at a relatively high first torque value according to the setting input on the screen, and then reduces the upper limit from the first torque value to a relatively low second torque value and maintains the upper limit at the second torque value.

Images