movable platen

Abstract

The present invention relates to a movable platen that suppresses stress concentration. The movable platen is provided with: a knuckle pin connecting portion; a mold mounting portion; and a connecting portion that connects the knuckle pin connecting portion and the mold mounting portion to form a clamping force transmission path, the connecting portion having: a first end portion connected to the knuckle pin connecting portion; a second end portion connected to the mold mounting portion and forming the transmission path between the first end portion; and a third end portion branched from the transmission path, the third end portion having a mounting portion that mounts a mounting member.

Description

TECHNICAL FIELD

[0001] The present application relates to a movable platen of a clamping device. BACKGROUND

[0002] An injection molding machine provided with a clamping device that moves a movable platen is known.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-064308 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, when clamping is performed, if stress concentration occurs, the platen can be damaged.

[0008] Therefore, an object of the present application is to provide a movable platen that suppresses stress concentration.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] The movable platen of one embodiment has a toggle pin connection portion, a mold mounting portion, and a connection portion that connects the toggle pin connection portion and the mold mounting portion to form a clamping force transmission path, the connection portion having a first end portion connected to the toggle pin connection portion, a second end portion connected to the mold mounting portion and forming the transmission path between the first end portion, and a third end portion branched from the transmission path, the third end portion having a mounting portion that mounts a mounting member.

[0011] EFFECTS OF THE INVENTION

[0012] According to the present application, a movable platen that suppresses stress concentration can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a view showing a state at the end of mold opening of an injection molding machine to which one embodiment is applied.

[0014] Figure 2 is a view showing a state at clamping of an injection molding machine to which one embodiment is applied.

[0015] Figure 3 is a perspective view of a movable platen.

[0016] Figure 4 is a perspective view of a movable platen.

[0017] Figure 5 is a front view of a movable platen.

[0018] Figure 6 This is a side view of the movable pressure plate.

[0019] Figure 7 This is the rear view of the movable pressure plate.

[0020] Figure 8 This is a top view of the movable pressure plate. Detailed Implementation

[0021] Hereinafter, the embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the drawings, the same or corresponding structures are labeled with the same or corresponding symbols, and the descriptions are omitted.

[0022] <Injection Molding Machine 1>

[0023] First, using Figure 1 and Figure 2 The injection molding machine 1 will be described. Figure 1 This is a diagram showing the state of an injection molding machine at the end of mold opening according to one embodiment. Figure 2 This diagram illustrates the mold-closing state of an injection molding machine according to one embodiment. In this specification, the X-axis, Y-axis, and Z-axis are mutually perpendicular directions. The X-axis and Y-axis represent horizontal directions, and the Z-axis represents vertical directions. When the mold-closing device 100 is horizontal, the X-axis represents the mold opening and closing direction, and the Y-axis represents the width direction of the injection molding machine 1. The negative side of the Y-axis is referred to as the operating side, and the positive side of the Y-axis is referred to as the reverse operating side.

[0024] like Figures 1-2 As shown, the injection molding machine 1 includes: a mold clamping device 100, a mold opening and closing device 800; an ejection device 200 for ejecting the molded article formed by the mold device 800; an injection device 300 for injecting 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 the various components of the injection molding machine 1; and a frame 900 for supporting the various components of the injection molding machine 1. The frame 900 includes a mold clamping device frame 910 supporting the mold clamping device 100 and an injection device frame 920 supporting the injection device 300. The mold clamping device frame 910 and the injection device frame 920 are respectively mounted on the base plate 2 via a leveling adjuster 930. The control device 700 is arranged in the internal space of the injection device frame 920. The various components of the injection molding machine 1 will be described below.

[0025] (Mold closing device)

[0026] In the description of the mold clamping device 100, the direction of movement of the movable platen 120 at the time of mold closing (for example, the positive direction of the X-axis) is taken as the front direction, and the direction of movement of the movable platen 120 at the time of mold opening (for example, the negative direction of the X-axis) is taken as the rear direction.

[0027] The mold clamping device 100 performs mold closing, pressure buildup, mold clamping, pressure release, and mold opening of the mold device 800. The mold device 800 includes a stationary mold 810 and a movable mold 820.

[0028] The mold clamping device 100 is, for example, a horizontal type, and the mold opening and closing direction is the horizontal direction. The mold clamping device 100 has a fixed platen 110 on which the stationary mold 810 is mounted, a movable platen 120 on which the movable mold 820 is mounted, and a movement mechanism that moves the movable platen 120 with respect to the fixed platen 110 in the mold opening and closing direction.

[0029] The fixed platen 110 is fixed with respect to the mold clamping device frame 910. The stationary mold 810 is mounted on the surface of the fixed platen 110 that is opposite the movable platen 120.

[0030] The movable platen 120 is configured to be freely movable with respect to the mold clamping device frame 910 in the mold opening and closing direction. A guide 101 that guides 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 is opposite the fixed platen 110.

[0031] The movement mechanism performs mold closing, pressure buildup, mold clamping, pressure release, and mold opening of the mold device 800 by advancing and retreating the movable platen 120 with respect to the fixed platen 110. The movement mechanism has a toggle base 130 that is disposed apart from the fixed platen 110, a connecting rod 140 that links the fixed platen 110 and the toggle base 130, a toggle mechanism 150 that moves the movable platen 120 with respect to the toggle base 130 in the mold opening and closing direction, a mold clamping motor 160 that operates the toggle mechanism 150, a motion conversion mechanism 170 that converts the rotational motion of the mold clamping motor 160 into linear motion, and a mold thickness adjustment mechanism 180 that adjusts the interval between the fixed platen 110 and the toggle base 130.

[0032] The toggle base 130 is disposed apart from the fixed platen 110 and is laid on the mold clamping device frame 910 so as to be freely movable in the mold opening and closing direction. Alternatively, the toggle base 130 can be configured to be freely movable along a guide laid on the mold clamping device frame 910. The guide of the toggle base 130 can be common with the guide 101 of the movable platen 120.

[0033] In addition, in the present embodiment, the fixed platen 110 is fixed with respect to the mold clamping device frame 910, and the toggle base 130 is configured to be movable in the mold opening and closing direction with respect to the mold clamping device frame 910, but the toggle base 130 can be fixed with respect to the mold clamping device frame 910, and the fixed platen 110 can be configured to be movable in the mold opening and closing direction with respect to the mold clamping device frame 910.

[0034] The connecting rods 140 connect the fixed platen 110 and the toggle base 130 across the interval L in the mold opening and closing direction. The connecting rods 140 can be used in multiple numbers (for example, four). The multiple connecting rods 140 are configured to be parallel to the mold opening and closing direction, and to extend in accordance with the clamping force. A connecting rod strain detector 141 that detects the strain of the connecting rods 140 can be provided on at least one of the connecting rods 140. The connecting rod strain detector 141 transmits a signal indicating the detection result thereof to the control device 700. The detection result of the connecting rod strain detector 141 is used for the detection of the clamping force and the like.

[0035] In addition, in the present embodiment, the connecting rod strain detector 141 is used as the clamping force detector that detects the clamping force, but the present application is not limited thereto. The clamping force detector is not limited to the strain gauge type, but can be a piezoelectric type, a capacitance type, a hydraulic type, an electromagnetic type, and the like, and the installation position thereof is not limited to the connecting rods 140.

[0036] The toggle mechanism 150 is configured between the movable platen 120 and the toggle base 130, and moves the movable platen 120 with respect to the toggle base 130 in the mold opening and closing direction. The toggle mechanism 150 has a cross head 151 that moves in the mold opening and closing direction, and a pair of link sets that are bent and extended by the movement of the cross head 151. The pair of link sets each has a first link 152 and a second link 153 that are connected so as to be bendable and extendable. The first link 152 is installed so as to be swingable with respect to the movable platen 120 by a pin or the like. The second link 153 is installed so as to be swingable with respect to the toggle base 130 by a pin or the like. The second link 153 is installed to the cross head 151 via a third link 154. If the cross head 151 is advanced and retracted with respect to the toggle base 130, the first link 152 and the second link 153 are bent and extended, so that the movable platen 120 is advanced and retracted with respect to the toggle base 130.

[0037] In addition, the structure of the toggle mechanism 150 is not limited to the structure shown in Figure 1 and Figure 2 For example, in Figure 1 and Figure 2 , the number of nodes of each link set is five, but can be four, or one end portion of the third link 154 can be joined to the nodes of the first link 152 and the second link 153.

[0038] The clamp motor 160 is installed to the toggle seat 130 and operates the toggle mechanism 150. The clamp motor 160 advances and retracts the cross head 151 relative to the toggle seat 130, thereby advancing and retracting the first link 152 and the second link 153, and advancing and retracting the movable platen 120 relative to the toggle seat 130. The clamp motor 160 is directly linked to the motion conversion mechanism 170, but can be linked to the motion conversion mechanism 170 via a belt, a pulley, or the like.

[0039] The motion conversion mechanism 170 converts the rotational motion of the clamp motor 160 to the linear motion of the cross head 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut that is screwed to the screw shaft. A ball or a roller can be interposed between the screw shaft and the screw nut.

[0040] The clamp device 100 performs a mold closing process, a pressure buildup process, a mold clamping process, a pressure release process, and a mold opening process, and the like, under the control of the control device 700.

[0041] In the mold closing process, the cross head 151 is advanced to a mold closing end position at a set moving speed by driving the clamp motor 160, thereby advancing the movable platen 120 and bringing the movable platen 120 into contact with the fixed platen 810. The position and the moving speed of the cross head 151 are detected, for example, using the clamp motor encoder 161 or the like. The clamp motor encoder 161 detects the rotation of the clamp motor 160 and transmits a signal indicating the detection result to the control device 700.

[0042] In addition, the cross head position detector that detects the position of the cross head 151 and the cross head moving speed detector that detects the moving speed of the cross head 151 are not limited to the clamp motor encoder 161, and a conventional detector can be used. Furthermore, the movable platen position detector that detects the position of the movable platen 120 and the movable platen moving speed detector that detects the moving speed of the movable platen 120 are not limited to the clamp motor encoder 161, and a conventional detector can be used.

[0043] In the pressure buildup process, the cross head 151 is further advanced from the mold closing end position to a mold clamping position by further driving the clamp motor 160, thereby generating a mold clamping force.

[0044] In the mold clamping process, the position of the cross head 151 is maintained at the mold clamping position by driving the clamp motor 160. In the mold clamping process, the mold clamping force generated in the pressure buildup process is maintained. In the mold clamping process, the cavity space 801 is formed between the movable platen 820 and the fixed platen 810 (see FIG. 1) and the injection device 300 fills the cavity space 801 with a liquid molding material. The filled molding material is solidified, thereby obtaining a molded product. Figure 2

[0045] ​The number of the cavity spaces 801 can be one or plural. In the latter case, a plurality of molded products can be obtained at the same time. An insert can be arranged in a part of the cavity spaces 801, and the cavity spaces 801 can be filled with a molding material in another part. A molded product in which the insert and the molding material are integrated can be obtained.

[0046] In the pressure-releasing process, the movable platen 120 is retracted by driving the clamp motor 160 to move the cross head 151 from the clamping position to the start-of-unclamping position. The start-of-unclamping position and the end-of-clamping position can be the same position.

[0047] In the unclamping process, the movable platen 120 is retracted by driving the clamp motor 160 to move the cross head 151 from the start-of-unclamping position to the end-of-unclamping position at a set moving speed, thereby separating the movable die 820 from the fixed die 810. Then, the molded product is ejected from the movable die 820 by the ejector 200.

[0048] The set conditions in the clamping process, the pressure-increasing process, and the unclamping process are set as a series of set conditions. For example, the moving speed, the positions (including the start-of-clamping position, the moving speed switching position, the end-of-clamping position, and the clamping position) of the cross head 151, and the clamping force in the clamping process and the pressure-increasing process are set as a series of set conditions. The start-of-clamping position, the moving speed switching position, the end-of-clamping position, and the clamping position are arranged in order from the rear side to the front side, and indicate the start point and the end point of the interval in which the moving speed is set. The moving speed is set for each interval. The moving speed switching position can be one or plural. The moving speed switching position can not be set. Only one of the clamping position and the clamping force can be set.

[0049] The set conditions in the pressure-releasing process and the unclamping process are also set in the same manner. For example, the moving speed, the positions (the start-of-unclamping position, the moving speed switching position, and the end-of-unclamping position) of the cross head 151 in the pressure-releasing process and the unclamping process are set as a series of set conditions. The start-of-unclamping position, the moving speed switching position, and the end-of-unclamping position are arranged in order from the front side to the rear side, and indicate the start point and the end point of the interval in which the moving speed is set. The moving speed is set for each interval. The moving speed switching position can be one or plural. The moving speed switching position can not be set. The start-of-unclamping position and the end-of-clamping position can be the same position. Also, the end-of-unclamping position and the start-of-clamping position can be the same position.

[0050] In addition, instead of the moving speed, the positions, and the like of the cross head 151, the moving speed, the positions, and the like of the movable platen 120 can be set. Also, instead of the positions (for example, the clamping position) of the cross head and the positions of the movable platen, the clamping force can be set.

[0051] However, the toggle mechanism 150 amplifies the driving force of the clamp motor 160 and transmits it to the movable platen 120. The amplification ratio thereof is also called toggle ratio. The toggle ratio varies depending on 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 found depending on the position of the cross head 151. When the link angle θ is 180°, the toggle ratio becomes the maximum.

[0052] When the thickness of the mold device 800 has changed due to replacement of the mold device 800, temperature change of the mold device 800, or the like, mold thickness adjustment is performed to obtain a prescribed clamp force at the time of clamping. In the mold thickness adjustment, for example, the interval L of the fixed platen 110 and the toggle base 130 is adjusted so that the link angle θ of the toggle mechanism 150 becomes a prescribed angle at the time when the movable mold 820 and the stationary mold 810 come into contact with each other.

[0053] The clamp device 100 has a mold thickness adjustment mechanism 180. The mold thickness adjustment mechanism 180 adjusts the interval L of the fixed platen 110 and the toggle base 130, thereby performing mold thickness adjustment. In addition, as for the timing of the mold thickness adjustment, for example, it is performed during a period from the end of a 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 portion of the connecting rod 140, a screw nut 182 held so as to be rotatable and non-retractable on the toggle base 130, and a mold thickness adjustment motor 183 that rotates the screw nut 182 screwed with the screw shaft 181.

[0054] The screw shaft 181 and the 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 a rotational driving force transmission portion 185. The plurality of screw nuts 182 can be rotated in synchronization. In addition, by changing the transmission path of the rotational driving force transmission portion 185, the plurality of screw nuts 182 can also be individually rotated.

[0055] The rotational driving force transmission portion 185 is constituted by, for example, gears and the like. At this time, driven gears are formed on the outer periphery of each screw nut 182, a drive gear is attached to the output shaft of the mold thickness adjustment motor 183, and an intermediate gear that meshes with the plurality of driven gears and the drive gear is held so as to be rotatable at the central portion of the toggle base 130. In addition, instead of gears, the rotational driving force transmission portion 185 can be constituted by a belt, a pulley, and the like.

[0056] The operation of the mold thickness adjustment mechanism 180 is controlled by the control device 700. The control device 700 rotates the screw nut 182 by driving the mold thickness adjustment motor 183. As a result, the position of the toggle base 130 with respect to the connecting rod 140 is adjusted, and the interval L of the fixed platen 110 and the toggle base 130 is adjusted. In addition, a plurality of mold thickness adjustment mechanisms can also be used in combination.

[0057] The interval L is detected using a die thickness adjustment motor encoder 184. The die thickness adjustment motor encoder 184 detects the amount of rotation, the direction of rotation of the die thickness adjustment motor 183, and transmits a signal indicating the detection result to the control device 700. The detection result of the die thickness adjustment motor encoder 184 is used for monitoring and controlling the position of the knuckle seat 130, the interval L. Note that the knuckle seat position detector that detects the position of the knuckle seat 130 and the interval detector that detects the interval L are not limited to the die thickness adjustment motor encoder 184, and a conventional detector can be used.

[0058] The clamping device 100 can have a die temperature adjuster that adjusts the temperature of the die device 800. The die device 800 has a flow path of a temperature adjustment medium inside thereof. The die temperature adjuster adjusts the temperature of the temperature adjustment medium supplied to the flow path of the die device 800, thereby adjusting the temperature of the die device 800.

[0059] Note that the clamping device 100 of the present embodiment is a horizontal type in which the die opening and closing direction is the horizontal direction, but can be a vertical type in which the die opening and closing direction is the vertical direction.

[0060] Note that the clamping device 100 of the present embodiment has the clamping motor 160 as a drive source, but can have a hydraulic cylinder instead of the clamping motor 160. Also, the clamping device 100 can have a linear motor as for the die opening and closing, and an electromagnet as for the clamping.

[0061] (Ejection device)

[0062] In the description of the ejection device 200, as in the description of the clamping device 100 and the like, the moving direction of the movable platen 120 at the time of clamping (for example, the positive direction of the X axis) is taken as the front direction, and the moving direction of the movable platen 120 at the time of opening (for example, the negative direction of the X axis) is taken as the rear direction.

[0063] The ejection device 200 is attached to the movable platen 120 and advances and retreats with the movable platen 120. The ejection device 200 has an ejection rod 210 that ejects a molded product from the die device 800, and a drive mechanism 220 that moves the ejection rod 210 in the moving direction of the movable platen 120 (the X axis direction).

[0064] The ejection rod 210 is disposed so as to be able to advance and retreat through the through hole of the movable platen 120. The front end portion of the ejection rod 210 is in contact with the ejection plate 826 of the movable die 820. The front end portion of the ejection rod 210 can be joined to the ejection plate 826, or can not be joined thereto.

[0065] The drive mechanism 220 has, for example, an ejection motor and a motion conversion mechanism that converts the rotational motion of the ejection motor into the linear motion of the ejector rod 210. The motion conversion mechanism includes a screw shaft and a screw nut that is screwed with the screw shaft. A ball or a roller can be interposed between the screw shaft and the screw nut.

[0066] The ejection device 200 performs the ejection process under the control of the control device 700. In the ejection process, the ejector rod 210 is advanced from the standby position to the ejection position at a set moving speed, thereby advancing the ejector plate 826 to eject the molded product. Then, the ejector rod 210 is retreated at the set moving speed by driving the ejection motor, and the ejector plate 826 is retreated to the original standby position.

[0067] The position and the moving speed of the ejector rod 210 are detected, for example, using an ejection motor encoder. The ejection motor encoder detects the rotation of the ejection motor and transmits a signal indicating the detection result to the control device 700. In addition, the ejector rod position detector that detects the position of the ejector rod 210 and the ejector rod moving speed detector that detects the moving speed of the ejector rod 210 are not limited to the ejection motor encoder, and a conventional detector can be used.

[0068] (Injection device)

[0069] In the description of the injection device 300, unlike the description of the clamping device 100 and the description of the ejection device 200, the moving direction of the screw 330 at the time of filling (for example, the negative direction of the X axis) is set as the front, and the moving direction of the screw 330 at the time of metering (for example, the positive direction of the X axis) is set as the back.

[0070] The injection device 300 is provided to the slide base 301 that is configured to be freely advanced and retreated with respect to the injection device frame 920. The injection device 300 is configured to be freely advanced and retreated with respect to the mold device 800. The injection device 300 is in contact with the mold device 800 and fills the cavity space 801 in the mold device 800 with a molding material. The injection device 300 has, for example, a cylinder 310 that heats the molding material, a nozzle 320 provided to the front end portion of the cylinder 310, a screw 330 that is configured to be freely advanced and retreated and freely rotated in the cylinder 310, a metering motor 340 that rotates the screw 330, an injection motor 350 that advances and retreats the screw 330, and a load detector 360 that detects the load transmitted between the injection motor 350 and the screw 330.

[0071] The cylinder 310 heats the molding material supplied from the supply port 311 to the inside. The molding material includes, for example, resin or the like. The molding material is formed, for example, in a pellet shape, and is supplied to the supply port 311 in a solid state. The supply port 311 is formed in the rear portion of the cylinder 310. A cooler 312 such as a water-cooled cylinder is provided on the outer periphery of the rear portion of the cylinder 310. A heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310 in front of the cooler 312.

[0072] The cylinder 310 is divided into a plurality of regions in the axial direction (for example, the X-axis direction) of the cylinder 310. The heater 313 and the temperature detector 314 are provided in the respective regions. The respective regions are set to have set temperatures, and the control device 700 controls the heater 313 so that the detected temperature of the temperature detector 314 becomes the set temperature.

[0073] The nozzle 320 is provided at the front end portion of the cylinder 310, and presses the mold device 800. The heater 313 and the 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 the set temperature.

[0074] The screw 330 is configured to be rotatable and movable in and out in the cylinder 310. If the screw 330 is rotated, the molding material is transported to the front along the helical groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being transported to the front. As the liquid molding material is transported to the front of the screw 330 and accumulated in the front portion of the cylinder 310, the screw 330 is retracted. Then, if the screw 330 is advanced, the liquid molding material accumulated in the front of the screw 330 is injected from the nozzle 320 and filled in the mold device 800.

[0075] A check ring 331 that functions as a check valve is movably installed in the front portion of the screw 330. The check ring 331 prevents the backflow of the molding material from the front to the rear of the screw 330 when the screw 330 is pushed forward.

[0076] When the screw 330 is advanced, the check ring 331 is pushed to the rear by the pressure of the molding material in front of the screw 330, and relatively retracts to a closed position (see FIG. 2) that blocks the flow path of the molding material with respect to the screw 330. Thus, the backflow of the molding material accumulated in the front of the screw 330 to the rear is prevented. Figure 2

[0077] On the other hand, when the screw 330 is rotated, the check ring 331 is pushed to the front by the pressure of the molding material transported to the front along the helical groove of the screw 330, and relatively advances to an open position (see FIG. 3) that opens the flow path of the molding material with respect to the screw 330. Figure 1 ​). Thus, the molding material is fed to the front of the screw 330.

[0078] The check ring 331 can be either of a co-rotating type that rotates together with the screw 330 and a non-co-rotating type that does not rotate together with the screw 330.

[0079] In addition, the injection device 300 can have a drive source that advances and retreats the check ring 331 relative to the screw 330 between the open position and the closed position.

[0080] The metering motor 340 rotates the screw 330. The drive source that rotates the screw 330 is not limited to the metering motor 340, and can be, for example, a hydraulic pump or the like.

[0081] The injection motor 350 advances and retreats the screw 330. A motion conversion mechanism or the like that converts the rotational motion of the injection motor 350 to the linear motion of the screw 330 is provided between the injection motor 350 and the screw 330. The motion conversion mechanism has, for example, a lead screw shaft and a lead screw nut that is screwed with the lead screw shaft. A ball, a roller, or the like can be provided between the lead screw shaft and the lead screw nut. The drive source that advances and retreats the screw 330 is not limited to the injection motor 350, and can be, for example, a hydraulic cylinder or the like.

[0082] The load detector 360 detects the load transmitted between the injection motor 350 and the screw 330. The detected load is converted to pressure by the control device 700. The load detector 360 is provided to the load transmission path between the injection motor 350 and the screw 330, and detects the load acting on the load detector 360.

[0083] The load detector 360 transmits a signal of the detected load to the control device 700. The load detected by the load detector 360 is converted to the pressure acting between the screw 330 and the molding material, and is used for the control, the monitoring of the pressure that the screw 330 receives from the molding material, the back pressure to the screw 330, and the pressure that acts on the molding material from the screw 330.

[0084] In addition, the pressure detector that detects the pressure of the molding material is not limited to the load detector 360, and a conventional detector can be used. For example, a nozzle pressure sensor or a mold internal pressure sensor can be used. The nozzle pressure sensor is provided to the nozzle 320. The mold internal pressure sensor is provided to the inside of the mold device 800.

[0085] The injection device 300 performs the metering process, the filling process, and the holding process, or the like, under the control of the control device 700. The filling process and the holding process can be collectively referred to as the injection process.

[0086] In the metering process, the metering motor 340 is driven to rotate the screw 330 at a set rotational speed, and the molding material is conveyed along the helical groove of the screw 330 to the front. Thus, the molding material is gradually melted. As the liquid molding material is conveyed to the front of the screw 330 and accumulated in the front portion of the cylinder 310, the screw 330 is retracted. The rotational speed of the screw 330 is detected, for example, using 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 rotational speed detector that detects the rotational speed of the screw 330 is not limited to the metering motor encoder 341, and a conventional detector can be used.

[0087] In the metering process, in order to limit the rapid retraction of the screw 330, the injection motor 350 can be driven to apply a set back pressure to the screw 330. The back pressure to the screw 330 is detected, for example, using a load detector 360. If the screw 330 is retracted to the metering end position and a prescribed amount of molding material is accumulated in front of the screw 330, the metering process ends.

[0088] The position and rotational speed of the screw 330 in the metering process are set as a series of set conditions. For example, the metering start position, the rotational speed switching position, and the metering end position are set. These positions are arranged in order from the front side toward the rear, and indicate the start point and end point of the interval of the set rotational speed. The rotational speed is set for each interval. The rotational speed switching position can be one or a plurality. The rotational speed switching position can not be set. Furthermore, the back pressure is set for each interval.

[0089] In the filling process, the injection motor 350 is driven to advance the screw 330 at a set moving speed, and the liquid molding material accumulated in front of the screw 330 is filled into the cavity space 801 in the mold device 800. The position and moving speed of the screw 330 are detected, for example, using an injection motor encoder 351. The injection motor encoder 351 detects the rotation of the injection motor 350 and sends a signal indicating the detection result to the control device 700. If the position of the screw 330 reaches a set position, switching from the filling process to the holding process (so-called V / P switching) is performed. The position at which 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, or the like.

[0090] The position and the moving speed of the screw 330 in the filling step are set as a series of set conditions. For example, a filling start position (also referred to as an "injection start position"), a moving speed switching position, and a V / P switching position are set. These positions are arranged in order from the rear side toward the front side, and indicate the start point and the end point of the interval in which the moving speed is set. The moving speed is set for each interval. The moving speed switching position can be one or a plurality. The moving speed switching position can not be set.

[0091] For each interval in which the moving speed of the screw 330 is set, an upper limit value of the pressure of the screw 330 is set. The pressure of the screw 330 is detected by the load detector 360. When the pressure of the screw 330 is below the set pressure, the screw 330 advances at the set moving speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 advances at a moving speed slower than the set moving speed in order to make the pressure of the screw 330 below the set pressure for the purpose of protecting the mold.

[0092] In addition, in the filling step, after the position of the screw 330 reaches the V / P switching position, the screw 330 can be caused to pause at the V / P switching position, and then V / P switching can be performed. Instead of stopping the screw 330, micro-advance or micro-reverse of the screw 330 can be performed before V / P switching is to be performed. Furthermore, the screw position detector that detects the position of the screw 330 and the screw moving speed detector that detects the moving speed of the screw 330 are not limited to the injection motor encoder 351, and a conventional detector can be used.

[0093] In the holding step, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the front end portion of the screw 330 (hereinafter also referred to as "holding pressure") is held at a set pressure, and the molding material remaining in the cylinder 310 is pushed toward the mold device 800. The molding material that is insufficient in the mold device 800 due to cooling shrinkage can be supplemented. The holding pressure is detected, for example, using the load detector 360. The set value of the holding pressure can be changed according to the elapsed time from the start of the holding step, or the like. The holding pressure in the holding step and the holding time in which the holding pressure is held can each be set to a plurality, or can be set as a series of set conditions.

[0094] In the holding step, the molding material in the cavity space 801 in the mold device 800 is gradually cooled, and at the end of the holding step, the inlet of the cavity space 801 is blocked by the solidified molding material. This state is referred to as gate sealing, and prevents the molding material from flowing backward from the cavity space 801. After the holding step, the cooling step is started. In the cooling step, the solidification of the molding material in the cavity space 801 is performed. The metering step can be performed in the cooling step in order to shorten the molding cycle time.

[0095] In addition, the injection apparatus 300 of the present embodiment is of a coaxial screw type, but can also be of a pre-plasticizing type or the like. An injection apparatus of the pre-plasticizing type supplies a molding material that has been melted in a plasticizing cylinder to an injection cylinder, and injects the molding material into a mold apparatus from the injection cylinder. In the plasticizing cylinder, a screw is configured to be rotatable and non-retractable, or the screw is configured to be rotatable and retractable. On the other hand, in the injection cylinder, a plunger is configured to be retractable and advanceable.

[0096] Also, the injection apparatus 300 of the present embodiment is of a horizontal type in which the axial direction of the cylinder 310 is the horizontal direction, but can also be of a vertical type in which the axial direction of the cylinder 310 is the vertical direction. A mold clamping apparatus that is combined with the injection apparatus 300 of the vertical type can be of a vertical type or a horizontal type. Likewise, a mold clamping apparatus that is combined with the injection apparatus 300 of the horizontal type can be of a horizontal type or a vertical type.

[0097] (Moving Apparatus)

[0098] In the description of the moving apparatus 400, as with the description of the injection apparatus 300, the moving direction of the screw 330 at the time of filling (for example, the negative direction of the X axis) is taken as the front direction, and the moving direction of the screw 330 at the time of metering (for example, the positive direction of the X axis) is taken as the rear direction.

[0099] The moving apparatus 400 advances and retracts the injection apparatus 300 with respect to the mold apparatus 800. Also, the moving apparatus 400 presses the nozzle 320 with respect to the mold apparatus 800 to generate a nozzle contact pressure. The moving apparatus 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

[0100] The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a pump that is rotatable in both directions, and generates hydraulic pressure by switching the rotation direction of the motor 420 to suck working fluid (for example, oil) from either of the first port 411 and the second port 412 and to discharge the working fluid from the other port. In addition, the hydraulic pump 410 is also capable of sucking working fluid from a tank and discharging the working fluid from either of the first port 411 and the second port 412.

[0101] The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 by the rotation direction and the rotation torque corresponding to a control signal from the control apparatus 700. The motor 420 can be an electric motor, or an electric servo motor.

[0102] The hydraulic cylinder 430 has a cylinder main body 431, a piston 432, and a piston rod 433. The cylinder main body 431 is fixed with respect to the injection device 300. The piston 432 divides the inside of the cylinder main 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 with respect to the fixed platen 110.

[0103] 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, whereby the injection device 300 is pushed forward. The injection device 300 advances and the nozzle 320 is pressed against the 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.

[0104] 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 working 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, whereby the injection device 300 is pushed backward. The injection device 300 retreats and the nozzle 320 is separated from the mold 810.

[0105] In addition, in the present embodiment, the moving device 400 includes the hydraulic cylinder 430, but the present application is not limited thereto. For example, instead of the hydraulic cylinder 430, 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 can be used.

[0106] (CONTROL DEVICE)

[0107] The control device 700 is constituted by, for example, a computer, as shown in FIG. 7, 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 performs various controls by causing the CPU 701 to execute a program stored in the storage medium 702. Also, the control device 700 receives a signal from the outside through the input interface 703 and transmits a signal to the outside through the output interface 704. Figures 1-2

[0108] The control device 700 repeatedly manufactures molded products by repeatedly performing the metering process, the mold closing process, the pressure increasing process, the mold clamping process, the filling process, the pressure maintaining process, the cooling process, the pressure releasing process, the mold opening process, and the ejection process. The series of actions for obtaining a molded product, for example, from the start of the metering process to the start of the next metering process, is also referred to as "shot" or "molding cycle". Also, the time required for one shot is also referred to as "molding cycle time" or "cycle time".​

[0109] The one-time molding cycle, for example, has a metering step, a closing step, a pressure increasing step, a clamping step, a filling step, a pressure maintaining step, a cooling step, a pressure decreasing step, an opening step, and an ejection step. The order here is the order in which the steps are started. The filling step, the pressure maintaining step, and the cooling step are performed during the clamping step. The start of the clamping step can be made to coincide with the start of the filling step. The end of the pressure decreasing step can be made to coincide with the start of the opening step.

[0110] In addition, for the purpose of shortening the molding cycle time, a plurality of steps can be performed simultaneously. For example, the metering step can be performed during the cooling step of the previous molding cycle, or during the clamping step. In this case, the closing step can be made to be performed at the beginning of the molding cycle. Also, the filling step can be made to start during the closing step. Also, the ejection step can be made to start during the opening step. When a valve that opens and closes the flow path of the nozzle 320 is provided, the opening step can be made to start during the metering step. The reason for this is that even if the opening step is started during the metering step, as long as the valve closes the flow path of the nozzle 320, the molding material will not leak from the nozzle 320.

[0111] In addition, the one-time molding cycle can have steps other than the metering step, the closing step, the pressure increasing step, the clamping step, the filling step, the pressure maintaining step, the cooling step, the pressure decreasing step, the opening step, and the ejection step.

[0112] For example, a pre-metering back-drawing step in which the screw 330 is made to retreat to a pre-set metering start position can be performed after the end of the pressure maintaining step and before the start of the metering step. The pressure of the molding material accumulated in front of the screw 330 can be reduced before the start of the metering step, and the sudden retreat of the screw 330 at the start of the metering step can be prevented.

[0113] Also, a post-metering back-drawing step in which the screw 330 is made to retreat to a pre-set filling start position (also referred to as an "injection start position") can be performed after the end of the metering step and before the start of the filling step. The pressure of the molding material accumulated in front of the screw 330 can be reduced before the start of the filling step, and the leakage of the molding material from the nozzle 320 before the start of the filling step can be prevented.

[0114] The control device 700 is connected to an operation device 750 that receives an input operation of a user and a display device 760 that displays a screen. The operation device 750 and the display device 760 are constituted by, for example, a touch panel 770, and can be integrated. The touch panel 770 as the display device 760 displays a screen under the control of the control device 700. Information such as a setting of the injection molding machine 1, a current state of the injection molding machine 1, and the like can be displayed on the screen of the touch panel 770. Also, an operation section such as a button for receiving an input operation of a user, an input field, and the like can be displayed on the screen of the touch panel 770. The touch panel 770 as the operation device 750 detects an input operation of a user on the screen and outputs a signal corresponding to the input operation to the control device 700. Thus, for example, a user can confirm information displayed on the screen while operating an operation section provided on the screen, perform a setting (including input of a setting value) of the injection molding machine 1, and the like. Also, a user operates an operation section provided on the screen, and thus the injection molding machine 1 corresponding to the operation section can be caused to act. Note that the act of the injection molding machine 1 can be, for example, an act (including stop) of the clamping device 100, the ejection device 200, the injection device 300, the moving device 400, and the like. Also, the act of the injection molding machine 1 can be, for example, switching of a screen displayed on the touch panel 770 as the display device 760.

[0115] Note that the operation device 750 and the display device 760 of the present embodiment are integrated into the touch panel 770, but can be provided separately. Also, a plurality of operation devices 750 can be provided. The operation device 750 and the display device 760 are disposed on the operation side (−Y axis direction) of the clamping device 100 (more specifically, the stationary platen 110).

[0116] <MOBILE PLATEN>

[0117] Next, the mobile platen 120 will be described. Figures 3 to 8 The mobile platen 120 will be further described. Figure 3 is a perspective view of the mobile platen 120. Figure 4 is a perspective view of the mobile platen 120. Figure 5 is a front view of the mobile platen 120. Figure 6 is a side view of the mobile platen 120. Figure 7 is a rear view of the mobile platen 120. Figure 8 is a plan view of the mobile platen 120. Note that in the following description, the left-right direction is also referred to as the operation-reversal operation direction (operation-reversal direction) (±Y axis direction) when the mobile platen 120 is viewed from the front. The −Y axis direction side is the operation side, and the +Y axis direction side is the reversal operation side. Also, the front-rear direction is also referred to as the mold opening-closing direction (±X axis direction) when the mobile platen 120 is viewed from the front. Also, the upward direction is also referred to as the vertical direction (+Z axis direction) when the mobile platen 120 is viewed from the front.

[0118] The movable platen 120 has a mold mounting plate 121, a support stage 122, a pair of inclined portions 123, a pair of toggle pin connecting portions 124, a pair of frame portions 125, a pair of leg portions 126, and a stop bolt mounting portion 127.

[0119] The mold mounting plate 121 is provided with the movable mold 820 mounted at a mold mounting portion (mold mounting surface) 121a. Through-holes 121b for the connecting rods 140 to be inserted therethrough are provided at the four corners of the mold mounting plate 121.

[0120] The support stage 122 is provided at the center of the back surface of the mold mounting plate 121.

[0121] The pair of inclined portions 123 are provided in the up-and-down direction from the center of the mold mounting plate 121 when viewed from the side. One end of the inclined portion 123 is connected to the support stage 122, and the other end of the inclined portion 123 is connected to the toggle pin connecting portion 124. The inclined portion 123 is inclined toward the center of the mold opening and closing direction. In other words, the pair of inclined portions 123 are formed so as to narrow in width in the up-and-down direction from the other end side (one side of the toggle pin connecting portion 124) toward the one end side (one side of the support stage 122).

[0122] The pair of toggle pin connecting portions 124 are provided in the up-and-down direction from the center of the mold mounting plate 121 when viewed from the side. The toggle pin connecting portion 124 is connected to the first link 152 via a link pin.

[0123] The clamping force of the clamping device 100 is transmitted from the toggle pin connecting portion 124 to the center of the back surface of the mold mounting plate 121 via the inclined portion 123 and the support stage 122. In other words, the inclined portion 123, the support stage 122, and the mold mounting plate 121 form a connecting portion of a transmission path of the clamping force from the toggle pin connecting portion 124 to the mold mounting portion 121a.

[0124] The pair of frame portions 125 are provided in the operation and counter-operation direction from the center of the mold mounting plate 121 when viewed from the back. The frame portion 125 is provided so as to connect the other end side of the pair of inclined portions 123 arranged in the up-and-down direction. When the clamping force of the clamping device 100 is generated, the frame portion 125 receives a force in the stretching direction and suppresses the other end side of the pair of inclined portions 123 from expanding in the up-and-down direction.

[0125] The leg portion 126 has a mounting portion 126a on which a slider that slides on the guide 101 is mounted. The mounting portion 126a has a connecting portion 126b connected to the mold mounting plate 121 on one side in the mold opening and closing direction. The mounting portion 126a has a connecting portion 126c connected to the inclined portion 123 on the other side in the mold opening and closing direction. A through-hole 126d for the connecting rod 140 to pass through is provided at the connecting portion 126c.

[0126] Furthermore, a stop bolt mounting part 127 is provided on an inclined portion 123 for mounting a stop bolt (not shown) to stop the movement of the movable pressure plate 120. By locking the stop bolt, the movable pressure plate 120 becomes immobile.

[0127] Installation Department

[0128] Furthermore, the movable pressure plate 120 is provided with a mounting part for mounting various mounting components.

[0129] A branch portion 11 protruding from the inclined surface S1 is provided on the upper surface of the inclined portion 123, i.e., the inclined surface S1. A screw hole (mounting portion) 11a for bolting a mounting component (e.g., a distribution valve) is formed in the branch portion 11. Figure 6 As shown, the screw hole 11a is located at a position different from the transmission path of the clamping force from the toggle pin connection 124 to the mold mounting portion 121a. In other words, the screw hole 11a is formed so as not to reach the inclined surface S1. That is, the connection portion has the other end side (first end) of the inclined portion 123 connected to the toggle pin connection 124, the mold mounting plate 121 (second end) connected to the mold mounting portion 121a and forming a transmission path of the clamping force between it and the first end, and the branch portion 11 (third end) branching from the transmission path, and the screw hole 11a (mounting portion) for mounting the mounting component is provided at the third end. Figure 6 As shown, the inclined surface S1 slopes downwards towards the front, for example. The branch 11 includes a triangular plate when viewed along the Y-axis, comprising a horizontal upper surface, a vertical front surface, and a rear surface that slopes downwards towards the front. A screw hole 11a is formed on the upper surface of the branch 11 and extends downwards. The lower end of the screw hole 11a is located above the inclined surface S1. A gap is formed between the front surface of the branch 11 and the rear surface of the mold mounting plate 121. The upper surface of the branch 11 is located, for example, below the upper surface of the mold mounting plate 121 and the upper surface of the toggle pin connection 124. The branch 11 is, for example, located at the center of the inclined portion 123 in the left-right direction.

[0130] Therefore, when the clamping device 100 generates clamping force, stress concentration in the screw hole 11a provided in the branch 11 can be avoided. Furthermore, stress concentration is easily avoided, ensuring strength, thereby increasing the design freedom of the connection portion forming the clamping force transmission path. Moreover, the upper and lower inclined portions 123 ensure even transmission of clamping force, thereby improving the uniformity of surface pressure distribution. Furthermore, even if additional machining or modification of the screw hole 11a is performed, it is possible to prevent any impact on the strength and quality (uniformity of clamping force) of the movable pressure plate 120.

[0131] And, a branch portion 12 protruding from the side surface S2 is provided on the side surface S2 (the side surface S2 on the positive direction side of the Y axis) of the frame portion 125 on the reverse operation side. A screw hole (mounting portion) 12a for bolt mounting a mounting member (for example, a motor holding bracket of the ejector device 200) is formed in the branch portion 12. As shown in Figure 7 , the screw hole 12a is provided at a position different from a transfer path of the mold clamping force from the toggle pin connection portion 124 to the mold mounting portion 121a. And, the branch portion 12 is formed so as not to reach the side surface S2 of the frame portion 125 which receives a force in the stretching direction when the mold clamping force is generated. That is, the connection portion has the other end side (first end portion) of the inclined portion 123 connected to the toggle pin connection portion 124, the mold mounting plate 121 (second end portion) connected to the mold mounting portion 121a and forming a transfer path of the mold clamping force between the first end portion, and the branch portion 12 (third end portion) of the frame portion 125 branched from the transfer path, and has the screw hole 12a (mounting portion) for mounting the mounting member at the third end portion. The branch portion 12 includes a plate which is L-shaped when viewed in the Z axis direction as shown in Figure 8 , and T-shaped when viewed in the Y axis direction as shown in Figure 3 . As shown in Figure 7 , the screw hole 12a is formed in the side surface of the branch portion 12 on the side opposite to the frame portion 125 (the positive direction side of the Y axis), and extends toward the negative direction of the Y axis. The front end of the screw hole 12a is located outside the frame portion 125. The upper surface of the branch portion 12 is, for example, in the same plane as the upper surface of the frame portion 125. The branch portion 12 and the screw hole 12a are disposed outside (the positive direction side of the Y axis) of the imaginary straight line connecting the upper and lower pair of toggle pin connection portions 124.

[0132] Thus, when the mold clamping device 100 generates the mold clamping force, stress concentration in the screw hole 12a provided in the branch portion 12 can be avoided. And, the strength can be easily ensured by avoiding stress concentration, and the design freedom can be improved. And, on the frame portion 125 on the operation direction side and on the reverse operation direction side, the stretching force can be made uniform. Thus, the uniformity of the surface pressure distribution of the mold clamping force can be improved by preventing the distortion of the inclined portion 123. And, even if additional processing or correction of the screw hole 12a is performed, the strength and quality (uniformity of the mold clamping force) of the movable platen 120 can be prevented from being affected.

[0133] And, a branch portion 13 protruding from the side surface S3 is provided on the side surface S3 (the side surface S3 on the positive direction side of the Y axis) of the frame portion 125 on the reverse operation side. A screw hole (mounting portion) 13a for bolt mounting a mounting member (for example, a bracket holding a cable drag chain (registered trademark)) is formed in the branch portion 13. As shown in Figure 7As shown, the branch portion 13 includes a plate that is rectangular when viewed in the X-axis direction. A screw hole 13a is formed in a side surface of the branch portion 13 on the side opposite the frame portion 125 (Y-axis positive direction side) and extends toward the Y-axis negative direction. The branch portion 13 and the screw hole 13a are disposed on the left and right direction outer sides (Y-axis positive direction side) of an imaginary straight line connecting the upper and lower pair of toggle pin connecting portions 124. Also, a branch portion 14 protruding from a side surface S4 (side surface S4 on the Y-axis negative direction side) of the frame portion 125 on the operation side is provided. A screw hole (mounting portion) 14a for bolt mounting a member is formed in the branch portion 14. As shown, Figure 7 As shown, the branch portion 14 includes a plate that is rectangular when viewed in the X-axis direction. A screw hole 14a is formed in a side surface of the branch portion 14 on the side opposite the frame portion 125 (Y-axis negative direction side) and extends toward the Y-axis positive direction. The front end of the screw hole 14a is disposed on the left and right direction outer sides (Y-axis negative direction side) of an imaginary straight line connecting the upper and lower pair of toggle pin connecting portions 124. Also, a branch portion 15 protruding from a back surface S5 of the frame portion 125 is provided. A screw hole (mounting portion) 15a for bolt mounting a member (e.g., an ejection device) is formed in the branch portion 15. As shown, Figure 7 As shown, the branch portion 15 includes a plate that is a right-angled trapezoid when viewed in the X-axis direction and includes an inclined surface inclined along the inner peripheral surface of the frame portion 125. A screw hole 15a is formed in a rear surface of the branch portion 15 and extends toward the front. The screw hole 15a is disposed on the left and right direction outer sides of an imaginary straight line connecting the upper and lower pair of toggle pin connecting portions 124. As shown, Figure 7 As shown, the screw holes 13a, 14a are provided at positions different from the transmission path of the mold clamping force from the toggle pin connecting portions 124 to the mold mounting portion 121a. Also, as shown, Figure 6 As shown, the screw hole 15a is provided at a position different from the transmission path of the mold clamping force from the toggle pin connecting portions 124 to the mold mounting portion 121a. Also, it is formed so that a part reaches the side surfaces S3, S4, the back surface S5 of the frame portion 125 that receives a force in the stretching direction when the mold clamping force is generated. That is, the connecting portion has the other end side (first end portion) of the inclined portion 123 connected to the toggle pin connecting portion 124, the mold mounting plate 121 (second end portion) connected to the mold mounting portion 121a and forming a transmission path of the mold clamping force between the first end portion, and the branch portions 13, 14, 15 (third end portion) of the frame portion 125 branching from the transmission path, and has screw holes 13a, 14a, 15a (mounting portions) for mounting a mounting member at the third end portion.

[0134] Therefore, by providing screw holes 13a, 14a, and 15a at the branches 13, 14, and 15 protruding from the sides S3, S4, and the back surface S5, the screw holes 13a, 14a, and 15a that intrude further toward the frame portion 125 than the sides S3, S4, and the back surface S5 can be shortened. This reduces stress concentration caused by the screw holes 13a, 14a, and 15a at the branches 13, 14, and 15.

[0135] Furthermore, branches 16 and 17 protruding from the upper surface S6 are provided on the upper surface S6 of the mold mounting plate 121. Screw holes (mounting portions) 16a for fixing mounting components (e.g., eye bolts for lifting the movable pressure plate 120) are formed in the branch 16. Figure 8 As shown, branch 16 includes a plate that is rectangular when viewed along the Z-axis. A pair of branch portions 16 are provided at intervals in the left-right direction (Y-axis direction). The pair of branch portions 16 are located on the left-right outer sides of the inclined portion 123 and the toggle pin connection portion 124. A screw hole 16a is formed on the upper surface of the branch portion 16 and extends downwards. The lower end of the screw hole 16a is, for example, positioned higher than the lower end of the toggle pin connection portion 124. A screw hole (mounting portion) 17a for bolting mounting components (e.g., air equipment) is formed in branch 17. Figure 8 As shown, branch 17 includes a plate that is rectangular when viewed along the Z-axis. A pair of branch 17s are provided at intervals in the left-right direction (Y-axis direction). A pair of branch 17s are provided between a pair of branch 16s. Branch 17s are positioned further rearward than the centerline that bisects the upper surface S6 of the mold mounting plate 121 in the front-rear direction (X-axis direction). A screw hole 17a is formed on the upper surface of the branch 17 and extends downward. The lower end of the screw hole 17a is positioned, for example, higher than the lower end of the toggle pin connection 124. Here, the clamping force is applied from the support platform 122 located at the center of the back surface of the mold mounting plate 121 towards the mold mounting portion 121a of the mold mounting plate 121. In other words, the branch portions 16 and 17 on the upper surface S6 of the mold mounting plate 121 are positioned at points branching off from the transmission path of the clamping force. That is, the connecting portion has the other end side (first end) of the inclined portion 123 connected to the toggle pin connecting portion 124, the surface of the mold mounting plate 121 connected to the mold mounting portion 121a and forming a mold clamping force transmission path between it and the first end (second end), and branch portions 16 and 17 (third end) of the upper surface S6 of the mold mounting plate 121 branching from the transmission path. The third end has screw holes 16a and 17a (mounting portions) for mounting mounting components. As a result, stress concentration caused by the screw holes 16a and 17a provided in the branch portions 16 and 17 can be reduced.

[0136] Furthermore, a branch portion 18 is provided on the side S8 of the operating side of the mold mounting plate 121. A screw hole (mounting portion) 18a for bolting mounting components (e.g., connector retaining brackets) is formed in the branch portion 18. Figure 6 As shown, the screw hole 18a is located further rearward than the center line that bisects the side surface S8 of the mold mounting plate 121 in the front-rear direction (X-axis direction). The screw hole 18a extends from the side surface S8 inward in the left-right direction (positive Y-axis direction side). The front end of the screw hole 18a is, for example, located further outward in the left-right direction (negative Y-axis direction side) than the support platform 122. Furthermore, a branch portion 19 is provided on the side surface S9 of the mold mounting plate 121 on the reverse operation side. A screw hole (mounting portion) 19a for bolting mounting components (e.g., a bracket for maintaining mold temperature regulation sockets, thermocouples, air pipes, water pipes) is formed in the branch portion 19. Similar to the screw hole 18a, the screw hole 19a is located further rearward than the center line that bisects the side surface S9 of the mold mounting plate 121 in the front-rear direction (X-axis direction). The screw hole 19a extends from the side surface S9 inward in the left-right direction (negative Y-axis direction side). The front end of the screw hole 19a is, for example, positioned further outward in the left-right direction (positive Y-axis direction) than the support platform 122. As described above, the clamping force is applied from the support platform 122, which is located at the center of the back surface of the mold mounting plate 121, toward the mold mounting portion 121a of the mold mounting plate 121. That is, the branch portions 18 and 19 on the sides S8 and S9 of the mold mounting plate 121 are located at positions where the clamping force transmission path branches off. Specifically, the connecting portion has the other end side (first end) of the inclined portion 123 connected to the toggle pin connecting portion 124, the surface of the mold mounting plate 121 (second end) connected to the mold mounting portion 121a and forming a clamping force transmission path between it and the first end, and the branch portions 18 and 19 on the sides S8 and S9 of the mold mounting plate 121 branching off from the transmission path (third end), and screw holes 18a and 19a (mounting portions) for mounting mounting components are provided at the third end. This reduces stress concentration caused by the screw holes 18a and 19a provided in the branches 18 and 19.

[0137] The above describes the implementation methods of the injection molding machine, but the present invention is not limited to the above implementation methods. Various modifications and improvements can be made within the scope of the spirit of the present invention as described in the patent claims.

[0138] This application claims priority based on Japanese Patent Application No. 2021-062450, filed on March 31, 2021, the entire contents of which are incorporated herein by reference.

[0139] Explanation of symbols

[0140] 1 - injection molding machine, 100 - mold clamping device, 120 - movable platen, 121 - mold mounting plate, 121a - mold mounting portion, 122 - support table, 123 - inclined portion, 124 - toggle pin connection portion, 125 - frame portion, 126 - leg portion, 11 to 19 - branch portions, 11a to 19a - screw holes (mounting portions)

Claims

1. A movable pressure plate, comprising: Toggle pin connection part; Mold assembly section; and The connecting part connects the toggle pin connecting part and the mold mounting part to form a path for transmitting the mold closing force. The connecting portion has: The first end is connected to the toggle pin connection part; The second end is connected to the mold mounting part and forms the transmission path between it and the first end; The third end branches off from the transmission path; and The inclined portion slopes from the toggle pin connection portion toward the center of the mold mounting plate having the mold mounting portion. The upper surface of the inclined portion is an inclined surface that slopes from the toggle pin connection portion toward the center of the mold mounting plate having the mold mounting portion. The inclined portion has a protrusion that protrudes upward from the inclined surface. The third end portion has a mounting portion for mounting components on the protrusion.

2. The movable pressure plate according to claim 1, wherein, The mounting part is a screw hole.

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