JP7604626B2 - Movable Platen - Google Patents

Description

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

Injection molding machines are known that are equipped with a clamping device that moves a movable platen.

JP 2010-064308 A

However, if stress concentration occurs during mold clamping, the platen may be damaged.

Therefore, the present invention aims to provide a movable platen that suppresses stress concentration.

A movable platen in one aspect of an embodiment comprises 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 transmission path for a clamping force, the connection portion having a first end connected to the toggle pin connection portion, a second end connected to the mold mounting portion and forming the transmission path between the first end and the connection portion, a third end branching off from the transmission path, and an inclined portion inclined from the toggle pin connection portion toward a center of a mold mounting plate having the mold mounting portion, the upper surface of the inclined portion being an inclined surface inclined from the toggle pin connection portion toward the center of a mold mounting plate having the mold mounting portion, and having a protrusion protruding upward from the inclined surface of the inclined portion, and the third end having an attachment portion to which an attachment part is attached to the protrusion .

The present invention provides a movable platen that suppresses stress concentration.

FIG. 2 is a diagram showing a state when mold opening is completed in the injection molding machine according to the embodiment. FIG. 2 is a diagram showing a state during mold clamping of the injection molding machine according to the embodiment. FIG. FIG. FIG. FIG. FIG. FIG.

Hereinafter, the embodiment of the present invention will be described with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same or corresponding reference numerals, and the description will be omitted.

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

As shown in Figures 1 and 2, the injection molding machine 1 has a clamping device 100 that opens and closes the mold device 800, an ejector device 200 that ejects a molded product molded by the mold device 800, an injection device 300 that injects molding material into the mold device 800, a moving device 400 that moves the injection device 300 forward and backward relative to the mold device 800, a control device 700 that controls each component of the injection molding machine 1, and a frame 900 that supports each component of the injection molding machine 1. The frame 900 includes a clamping device frame 910 that supports the clamping device 100, and an injection device frame 920 that supports the injection device 300. The clamping device frame 910 and the injection device frame 920 are each installed on the floor 2 via a leveling adjuster 930. The control device 700 is arranged in the internal space of the injection device frame 920. Each component of the injection molding machine 1 will be described below.

(Mold clamping device)
In the description of the mold clamping apparatus 100, the moving direction of the movable platen 120 during mold closing (e.g., the positive X-axis direction) is defined as the front, and the moving direction of the movable platen 120 during mold opening (e.g., the negative X-axis direction) is defined as the rear.

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

The mold clamping device 100 is, for example, a horizontal type, and the mold opening and closing direction is horizontal. The mold clamping device 100 has a fixed platen 110 to which a fixed mold 810 is attached, a movable platen 120 to which a movable mold 820 is attached, and a movement mechanism 102 that moves the movable platen 120 in the mold opening and closing direction relative to the fixed platen 110.

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

The movable platen 120 is arranged to be freely movable in the mold opening and closing direction relative to the mold clamping unit frame 910. A guide 101 that guides the movable platen 120 is laid on the mold clamping unit frame 910. A movable mold 820 is attached to the surface of the movable platen 120 facing the fixed platen 110.

The moving mechanism 102 performs mold closing, pressurization, mold clamping, depressurization, and mold opening of the mold device 800 by moving the movable platen 120 forward and backward relative to the fixed platen 110. The moving mechanism 102 has a toggle support 130 arranged at a distance from the fixed platen 110, a tie bar 140 connecting the fixed platen 110 and the toggle support 130, a toggle mechanism 150 that moves the movable platen 120 in the mold opening and closing direction relative to the toggle support 130, 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 distance between the fixed platen 110 and the toggle support 130.

The toggle support 130 is disposed at a distance from the fixed platen 110 and is placed on the mold clamping unit frame 910 so as to be freely movable in the mold opening and closing direction. The toggle support 130 may be disposed so as to be freely movable along a guide laid on the mold clamping unit frame 910. The guide of the toggle support 130 may be the same as the guide 101 of the movable platen 120.

In this embodiment, the fixed platen 110 is fixed to the mold clamping device frame 910, and the toggle support 130 is arranged so as to be freely movable in the mold opening and closing direction relative to the mold clamping device frame 910, but the toggle support 130 may be fixed to the mold clamping device frame 910, and the fixed platen 110 may be arranged so as to be freely movable in the mold opening and closing direction relative to the mold clamping device frame 910.

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

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

The toggle mechanism 150 is disposed between the movable platen 120 and the toggle support 130, and moves the movable platen 120 in the mold opening/closing direction relative to the toggle support 130. The toggle mechanism 150 has a crosshead 151 that moves in the mold opening/closing direction, and a pair of link groups that bend and stretch with the movement of the crosshead 151. Each of the pair of link groups has a first link 152 and a second link 153 that are connected to bendable and stretchable by a pin or the like. The first link 152 is attached to the movable platen 120 by a pin or the like so that it can swing freely. The second link 153 is attached to the toggle support 130 by a pin or the like so that it can swing freely. The second link 153 is attached to the crosshead 151 via a third link 154. When the crosshead 151 is advanced or retreated relative to the toggle support 130, the first link 152 and the second link 153 bend and stretch, and the movable platen 120 advances or retreats relative to the toggle support 130.

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

The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150. The mold clamping motor 160 moves the crosshead 151 forward and backward relative to the toggle support 130, thereby bending and extending the first link 152 and the second link 153 and moving the movable platen 120 forward and backward relative to the toggle support 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may also be connected to the motion conversion mechanism 170 via a belt, pulley, etc.

The motion conversion mechanism 170 converts the rotational motion of the clamping motor 160 into the linear motion of the crosshead 151. The motion conversion mechanism 170 includes a screw shaft and a screw nut that screws onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

The mold clamping device 100 performs processes such as mold closing, pressure increase, mold clamping, depressurization, and mold opening under the control of the control device 700.

In the mold closing process, the mold clamping motor 160 is driven to move the crosshead 151 forward at a set movement speed to the mold closing completion position, thereby moving the movable platen 120 forward and touching the movable mold 820 to the fixed mold 810. The position and movement speed of the crosshead 151 are detected using, for example, the 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.

The crosshead position detector that detects the position of the crosshead 151 and the crosshead movement speed detector that detects the movement speed of the crosshead 151 are not limited to the clamping motor encoder 161, and general-purpose detectors can be used. Furthermore, the movable platen position detector that detects the position of the movable platen 120 and the movable platen movement speed detector that detects the movement speed of the movable platen 120 are not limited to the clamping motor encoder 161, and general-purpose detectors can be used.

During the pressure increase process, the clamping motor 160 is further driven to move the crosshead 151 further forward from the mold closing completion position to the clamping position, thereby generating a clamping force.

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

The number of cavity spaces 801 may be one or more. In the latter case, multiple molded products are obtained simultaneously. An insert material may be placed in a part of the cavity space 801, and another part of the cavity space 801 may be filled with molding material. A molded product in which the insert material and molding material are integrated is obtained.

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

In the mold opening process, the mold clamping motor 160 is driven to move the crosshead 151 backward at a set moving speed from the mold opening start position to the mold opening completion position, thereby moving the movable platen 120 backward and separating the movable mold 820 from the fixed mold 810. After that, the ejector unit 200 ejects the molded product from the movable mold 820.

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

The setting conditions for the depressurization process and the mold opening process are also set in the same manner. For example, the movement speed and position of the crosshead 151 in the depressurization process and the mold opening process (mold opening start position, movement speed switching position, and mold opening completion position) are set together as a series of setting conditions. The mold opening start position, movement speed switching position, and mold opening completion position are arranged in this order from the front to the rear, and represent the start and end points of the section in which the movement speed is set. The movement speed is set for each section. There may be one or more movement speed switching positions. The movement speed switching position does not have to be set. The mold opening start position and the mold closing completion position may be the same position. Furthermore, the mold opening completion position and the mold closing start position may be the same position.

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. Also, the clamping force may be set instead of the position of the crosshead (e.g., the clamping position) or the position of the movable platen.

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 ratio. The toggle ratio changes according to the angle θ between the first link 152 and the second link 153 (hereinafter also referred to as the "link angle θ"). The link angle θ is determined from the position of the crosshead 151. When the link angle θ is 180°, the toggle ratio is maximum.

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

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 distance L between the fixed platen 110 and the toggle support 130. The mold thickness adjustment is performed, for example, between the end of a molding cycle and 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 tie bar 140, a screw nut 182 held rotatably and immovably on the toggle support 130, and a mold thickness adjustment motor 183 that rotates the screw nut 182 that screws onto the screw shaft 181.

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

The rotational drive force transmission unit 185 is composed of, for example, gears. In this case, a driven gear is 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 multiple driven gears and the drive gear is rotatably held in the center of the toggle support 130. Note that the rotational drive force transmission unit 185 may be composed of a belt, pulleys, etc. instead of gears.

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 screw nut 182. As a result, the position of the toggle support 130 relative to the tie bar 140 is adjusted, and the distance L between the fixed platen 110 and the toggle support 130 is adjusted. Note that multiple mold thickness adjustment mechanisms may be used in combination.

The distance L is detected using the mold thickness adjustment motor encoder 184. The mold thickness adjustment motor encoder 184 detects the amount and direction of rotation 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 support 130 and the distance L. Note that the toggle support position detector that detects the position of the toggle support 130 and the distance detector that detects the distance L are not limited to the mold thickness adjustment motor encoder 184, and general devices can be used.

The mold clamping device 100 may have a mold temperature regulator that regulates the temperature of the mold device 800. The mold device 800 has a flow path for a temperature control medium therein. The mold temperature regulator regulates the temperature of the temperature control medium supplied to the flow path of the mold device 800, thereby regulating the temperature of the mold device 800.

In addition, the mold clamping device 100 of this embodiment is a horizontal type in which the mold opening and closing direction is horizontal, but it may also be a vertical type in which the mold opening and closing direction is vertical.

In addition, the mold clamping device 100 of this embodiment has a mold clamping motor 160 as a drive source, but may have a hydraulic cylinder instead of the mold clamping motor 160. In addition, the mold clamping device 100 may have a linear motor for opening and closing the mold, and an electromagnet for mold clamping.

(Ejector device)
In describing the ejector unit 200, similar to the description of the mold clamping unit 100, the direction of movement of the movable platen 120 when the mold is closed (e.g., the positive direction of the X-axis) is defined as the front, and the direction of movement of the movable platen 120 when the mold is opened (e.g., the negative direction of the X-axis) is defined as the rear.

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

The ejector rod 210 is arranged to be freely movable forward and backward in a through hole of the movable platen 120. The front end of the ejector rod 210 contacts the ejector plate 826 of the movable mold 820. The front end of the ejector rod 210 may or may not be connected to the ejector plate 826.

The drive mechanism 220 has, 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 that screws onto the screw shaft. A ball or roller may be interposed between the screw shaft and the screw nut.

The ejector device 200 performs the ejection process under the control of the control device 700. In the ejection process, the ejector rod 210 advances from the standby position to the ejection position at a set moving speed, thereby advancing the ejector plate 826 and ejecting the molded product. The ejector motor is then driven to move the ejector rod 210 backward at the set moving speed, and the ejector plate 826 backward to the original standby position.

The position and movement speed of the ejector rod 210 are detected, for example, using 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. Note that the ejector rod position detector that detects the position of the ejector rod 210 and the ejector rod movement speed detector that detects the movement speed of the ejector rod 210 are not limited to the ejector motor encoder, and general types can be used.

(Injection unit)
In the explanation of the injection unit 300, unlike the explanations of the mold clamping unit 100 and the ejector unit 200, the movement direction of the screw 330 during filling (e.g., the negative X-axis direction) is described as the forward direction, and the movement direction of the screw 330 during metering (e.g., the positive X-axis direction) is described as the rearward direction.

The injection device 300 is installed on a slide base 301, and the slide base 301 is arranged so as to be freely movable forward and backward with respect to the injection device frame 920. The injection device 300 is arranged so as to be freely movable forward and backward with respect to the mold device 800. The injection device 300 touches the mold device 800 and fills the cavity space 801 in the mold device 800 with molding material. The injection device 300 has, for example, a cylinder 310 that heats the molding material, a nozzle 320 provided at the front end of the cylinder 310, a screw 330 arranged so as to be freely movable forward and backward and rotatable within the cylinder 310, a metering motor 340 that rotates the screw 330, an injection motor 350 that moves the screw 330 forward and backward, and a load detector 360 that detects the load transmitted between the injection motor 350 and the screw 330.

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

The cylinder 310 is divided into a plurality of zones in the axial direction of the cylinder 310 (e.g., the X-axis direction). A heater 313 and a temperature detector 314 are provided in each of the plurality of zones. A set temperature is set in each of the plurality of zones, and the control device 700 controls the heater 313 so that the detected temperature of the temperature detector 314 becomes the set temperature.

The nozzle 320 is provided at the front end of the cylinder 310 and is pressed against 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 the set temperature.

The screw 330 is arranged in the cylinder 310 so that it can rotate freely and move forward and backward. When the screw 330 is rotated, the molding material is sent forward along the spiral groove of the screw 330. As the molding material is sent forward, it is gradually melted by heat from the cylinder 310. As the liquid molding material is sent forward to the front of the screw 330 and accumulates at the front of the cylinder 310, the screw 330 is moved backward. When the screw 330 is then moved forward, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled into the mold device 800.

A backflow prevention ring 331 is attached to the front of the screw 330 and can move back and forth as a backflow prevention valve to prevent the molding material from flowing back from the front to the rear of the screw 330 when the screw 330 is pushed forward.

When the screw 330 is advanced, the backflow prevention ring 331 is pushed backward by the pressure of the molding material in front of the screw 330, and retreats relative to the screw 330 to a blocking position (see FIG. 2) where the flow path of the molding material is blocked. This prevents the molding material accumulated in front of the screw 330 from flowing backward.

On the other hand, when the screw 330 is rotated, the backflow prevention ring 331 is pushed forward by the pressure of the molding material sent forward along the spiral groove of the screw 330, and advances relative to the screw 330 to an open position (see FIG. 1) where the flow path of the molding material is opened. This causes the molding material to be sent forward of the screw 330.

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

Furthermore, the injection device 300 may have a driving source that moves the backflow prevention ring 331 back and forth between the open position and the closed position relative to the screw 330.

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

The injection motor 350 advances and retreats the screw 330. Between the injection motor 350 and the screw 330, a motion conversion mechanism that converts the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism has, for example, a screw shaft and a screw nut that screws onto the screw shaft. A ball or roller may be provided between the screw shaft and the screw nut. The drive source that advances and retreats the screw 330 is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder.

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 in the load transmission path between the injection motor 350 and the screw 330, and detects the load acting on the load detector 360.

The load detector 360 sends a signal of the detected load to the control device 700. The load detected by the load detector 360 is converted into pressure acting between the screw 330 and the molding material, and is used to control and monitor the pressure that the screw 330 receives from the molding material, the back pressure on the screw 330, and the pressure that the screw 330 exerts on the molding material.

The pressure detector that detects the pressure of the molding material is not limited to the load detector 360, and a general one can be used. For example, a nozzle pressure sensor or a mold internal pressure sensor may be used. The nozzle pressure sensor is installed in the nozzle 320. The mold internal pressure sensor is installed inside the mold device 800.

The injection device 300 performs a metering process, a filling process, a pressure holding process, etc. under the control of the control device 700. The filling process and the pressure holding process may be collectively referred to as the injection process.

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 sent forward along the spiral groove of the screw 330. As a result, the molding material is gradually melted. As the liquid molding material is sent forward of the screw 330 and accumulates at the front of the cylinder 310, the screw 330 is moved backward. The rotational speed of the screw 330 is detected, for example, using the 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. Note that 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 general one can be used.

In the metering process, in order to limit the sudden retreat of the screw 330, the injection motor 350 may be driven to apply a set back pressure to the screw 330. The back pressure on the screw 330 is detected, for example, using a load detector 360. When the screw 330 retreats to the metering completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the metering process is completed.

The position and rotational speed of the screw 330 in the metering process are set together as a series of setting conditions. For example, a metering start position, a rotational speed switching position, and a metering completion position are set. These positions are arranged in this order from the front to the rear, and represent the start and end points of the section for which the rotational speed is set. The rotational speed is set for each section. There may be one or more rotational speed switching positions. The rotational speed switching position does not have to be set. In addition, a back pressure is set for each section.

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 the 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. When the position of the screw 330 reaches the set position, a switch from the filling process to the pressure holding process (so-called V/P switch) is performed. The position where the V/P switch is performed is also called the V/P switch position. The set moving speed of the screw 330 may be changed depending on the position of the screw 330, time, etc.

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

An upper limit for the pressure of the screw 330 is set for each section in which the movement speed 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 equal to or lower than the set pressure, the screw 330 is advanced at the set movement speed. On the other hand, when the pressure of the screw 330 exceeds the set pressure, the screw 330 is advanced at a movement speed slower than the set movement speed so that the pressure of the screw 330 is equal to or lower than the set pressure in order to protect the mold.

In addition, after the position of the screw 330 reaches the V/P switching position during the filling process, the screw 330 may be temporarily stopped at the V/P switching position, and then the V/P switching may be performed. Immediately before the V/P switching, instead of stopping the screw 330, the screw 330 may be moved forward or backward at a slow speed. In addition, the screw position detector that detects the position of the screw 330 and the screw movement speed detector that detects the movement speed of the screw 330 are not limited to the injection motor encoder 351, and general types can be used.

In the holding pressure process, the injection motor 350 is driven to push the screw 330 forward, and the pressure of the molding material at the front end of the screw 330 (hereinafter also referred to as the "holding pressure") is maintained 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 due to cooling contraction in the mold device 800 can be replenished. The holding pressure is detected, for example, using a load detector 360. The set value of the holding pressure may be changed depending on the elapsed time from the start of the holding pressure process. The holding pressure and the holding time for holding the holding pressure in the holding pressure process may each be set multiple times, or may be set together as a series of setting conditions.

During the dwelling process, the molding material in the cavity space 801 in the mold device 800 is gradually cooled, and when the dwelling process is completed, the entrance to the cavity space 801 is blocked by solidified molding material. This state is called a gate seal, and prevents the molding material from flowing back from the cavity space 801. After the dwelling process, the cooling process is started. During the cooling process, the molding material in the cavity space 801 is solidified. A weighing process may be performed during the cooling process in order to shorten the molding cycle time.

The injection device 300 of this embodiment is an in-line screw type, but may also be a pre-plastication type. A pre-plastication type injection device supplies molding material molten in a plasticization cylinder to an injection cylinder, and injects the molding material from the injection cylinder into a mold device. A screw is arranged in the plasticization cylinder so that it can rotate freely but cannot move back and forth, or a screw is arranged so that it can rotate freely and move back and forth. Meanwhile, a plunger is arranged in the injection cylinder so that it can move back and forth.

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

(Mobile device)
In describing the moving device 400, similar to the description of the injection device 300, the movement direction of the screw 330 during filling (e.g., the negative X-axis direction) will be described as the forward direction, and the movement direction of the screw 330 during metering (e.g., the positive X-axis direction) will be described as the rearward direction.

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

The hydraulic pump 410 has a first port 411 and a second port 412. The hydraulic pump 410 is a pump that can rotate in both directions, and by switching the rotation direction of the motor 420, it draws in hydraulic fluid (e.g., oil) from either the first port 411 or the second port 412 and discharges it from the other port to generate hydraulic pressure. The hydraulic pump 410 can also draw in hydraulic fluid from a tank and discharge the hydraulic fluid from either the first port 411 or the second port 412.

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

The hydraulic cylinder 430 has 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 inside 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.

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

Meanwhile, 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 is retracted, and the nozzle 320 is separated from the fixed mold 810.

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

(Control device)
The control device 700 is configured, for example, by a computer, and has a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704 as shown in Figures 1 and 2. The control device 700 performs various controls by causing the CPU 701 to execute a program stored in the storage medium 702. The control device 700 also receives signals from the outside via the input interface 703, and transmits signals to the outside via the output interface 704.

The control device 700 repeatedly manufactures molded products by repeating processes such as the metering process, mold closing process, pressure increase process, mold clamping process, filling process, pressure holding process, cooling process, depressurization process, mold opening process, and ejection process. A series of operations required to obtain a molded product, for example the operations from the start of a metering process to the start of the next metering process, is also called a "shot" or "molding cycle." The time required for one shot is also called the "molding cycle time" or "cycle time."

One molding cycle includes, for example, a metering process, a mold closing process, a pressurization process, a mold clamping process, a filling process, a pressure holding process, a cooling process, a depressurization process, a mold opening process, and an ejection process, in this order. The order here refers to the order in which each process starts. The filling process, the pressure holding process, and the cooling process are performed during the mold clamping process. The start of the mold clamping process may coincide with the start of the filling process. Completion of the depressurization process coincides with the start of the mold opening process.

In addition, in order to shorten the molding cycle time, multiple processes may be performed simultaneously. For example, the metering process may be performed during the cooling process of the previous molding cycle, or during the mold clamping process. In this case, the mold closing process may be performed at the beginning of the molding cycle. The filling process may be started during the mold closing process. The ejection process may be started during the mold opening process. If an opening/closing valve is provided to open and close the flow path of the nozzle 320, the mold opening process may be started during the metering process. This is because even if the mold opening process is started during the metering process, molding material will not leak from the nozzle 320 as long as the opening/closing valve closes the flow path of the nozzle 320.

Furthermore, one molding cycle may include processes other than the metering process, mold closing process, pressure increase process, mold clamping process, filling process, pressure holding process, cooling process, depressurization process, mold opening process, and ejection process.

For example, after the dwelling step is completed and before the metering step is started, a pre-metering suck-back step may be performed in which the screw 330 is retracted to a preset metering start position. This can reduce the pressure of the molding material accumulated in front of the screw 330 before the metering step starts, and can prevent the screw 330 from retracting suddenly at the start of the metering step.

In addition, after the metering process is completed and before the filling process is started, a post-metering suck-back process may be performed in which the screw 330 is retracted to a preset filling start position (also called the "injection start position"). This can reduce the pressure of the molding material accumulated in front of the screw 330 before the filling process starts, and can prevent the molding material from leaking from the nozzle 320 before the filling process starts.

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

In this embodiment, the operation device 750 and the display device 760 are described as being integrated as the touch panel 770, but they may be provided independently. Also, multiple operation devices 750 may be provided. The operation device 750 and the display device 760 are arranged on the operation side (negative Y-axis direction) of the mold clamping unit 100 (more specifically, the fixed platen 110).

<Movable platen>
Next, the movable platen 120 will be further described with reference to Figs. 3 to 8. Fig. 3 is a perspective view of the movable platen 120. Fig. 4 is a perspective view of the movable platen 120. Fig. 5 is a front view of the movable platen 120. Fig. 6 is a side view of the movable platen 120. Fig. 7 is a rear view of the movable platen 120. Fig. 8 is a top view of the movable platen 120. In the following description, the left-right direction when the movable platen 120 is viewed from the front is also referred to as the counter-operation direction (counter-operation direction) (±Y-axis direction). The negative Y-axis direction side is the operation side, and the positive Y-axis direction side is the counter-operation side. In addition, when the movable platen 120 is viewed from the front, the front-rear direction is also referred to as the mold opening/closing direction (±X-axis direction). In addition, when the movable platen 120 is viewed from the front, the upward direction is also referred to as the vertical direction (+Z-axis direction).

The movable platen 120 has a mold mounting plate 121, a support base 122, a pair of inclined portions 123, a pair of toggle pin connection portions 124, a pair of frame portions 125, a pair of leg portions 126, and a stopper bolt mounting portion 127.

The movable mold 820 is attached to the mold mounting portion (mold mounting surface) 121a of the mold mounting plate 121. The four corners of the mold mounting plate 121 are provided with through-holes 121b through which the tie bars 140 are inserted.

The support stand 122 is provided at the center of the back surface of the mold mounting plate 121.

The pair of inclined portions 123 are respectively provided in the up-down direction from the center of the mold mounting plate 121 in a side view. One end of the inclined portion 123 is connected to the support base 122, and the other end of the inclined portion 123 is connected to the toggle pin connection portion 124. The inclined portion 123 inclines toward the center in the mold opening/closing direction. In other words, the pair of inclined portions 123 are formed so that the width in the up-down direction narrows from the other end side (the toggle pin connection portion 124 side) toward the one end side (the support base 122 side).

The pair of toggle pin connection parts 124 are provided in the upper and lower directions from the center of the mold mounting plate 121 in a side view. The toggle pin connection parts 124 are connected to the first link 152 via a connecting pin.

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

The pair of frame portions 125 are each provided in a direction opposite to the operation direction from the center of the mold mounting plate 121 when viewed from behind. The frame portions 125 are provided to connect the other end sides of the pair of inclined portions 123 arranged above and below. When the mold clamping force of the mold clamping device 100 is generated, the frame portions 125 receive a force in the pulling direction and suppress the other end sides of the pair of inclined portions 123 from expanding vertically.

The leg 126 has an attachment portion 126a to which a slider that slides on the guide 101 is attached. The attachment portion 126a has a connection portion 126b that is connected to the mold attachment plate 121 on one side in the mold opening/closing direction. The attachment portion 126a has a connection portion 126c that is connected to the inclined portion 123 on the other side in the mold opening/closing direction. The connection portion 126c is provided with a through portion 126d through which the tie bar 140 passes.

In addition, one of the inclined portions 123 is provided with a stopper bolt attachment portion 127 for attaching a stopper bolt (not shown) for stopping the movement of the movable platen 120. When the stopper bolt is locked, the movable platen 120 becomes immovable.

<Mounting part>
The movable platen 120 is also provided with mounting portions for mounting various mounting components.

The inclined surface S1, which is the upper surface of the upper inclined portion 123, is provided with a branch portion 11 protruding from the inclined surface S1. The branch portion 11 is provided with a screw hole (mounting portion) 11a for bolting an attachment part (e.g., a distribution valve). As shown in FIG. 6, the screw hole 11a is provided at a position different from the transmission path of the mold clamping force from the toggle pin connection portion 124 to the mold attachment 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 portion 124, the mold attachment plate 121 (second end) connected to the mold attachment portion 121a and forming a transmission path of the mold clamping force between the first end, and the branch portion 11 (third end) branching from the transmission path, and has a screw hole 11a (mounting portion) to which the attachment part is attached at the third end. The inclined surface S1 is inclined downward as it approaches the front, for example, as shown in FIG. 6. The branching portion 11 includes a triangular plate when viewed in the Y-axis direction, and includes a horizontal upper surface, a vertical front surface, and a rear surface that inclines downward as it approaches the front. The screw hole 11a is formed in the upper surface of the branching portion 11 and extends downward. 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 branching portion 11 and the rear surface of the mold mounting plate 121. The upper surface of the branching portion 11 is located, for example, below the upper surface of the mold mounting plate 121 and the upper surface of the toggle pin connection portion 124. The branching portion 11 is provided, for example, in the center of the inclined portion 123 in the left-right direction.

This makes it possible to avoid stress concentration in the threaded hole 11a provided in the branching portion 11 when a clamping force is generated in the clamping device 100. It also makes it easier to ensure strength by avoiding stress concentration, and improves the design freedom of the connection portion that forms the transmission path of the clamping force. It also makes it possible to transmit the clamping force evenly between the upper inclined portion 123 and the lower inclined portion 123, improving the uniformity of the surface pressure distribution. It also makes it possible to prevent additional machining or correction of the threaded hole 11a from affecting the strength and quality (uniformity of the clamping force) of the movable platen 120.

In addition, a branch portion 12 protruding from side surface S2 (side surface S2 on the Y-axis positive direction side) of the frame portion 125 on the counter-operation side is provided. A screw hole (mounting portion) 12a is formed in the branch portion 12 for bolting an attachment part (e.g., a motor holding bracket of the ejector device 200). As shown in FIG. 7, the screw hole 12a is provided at a position different from the transmission path of the mold clamping force from the toggle pin connection portion 124 to the mold attachment portion 121a. In addition, it is formed so as not to reach the side surface S2 of the frame portion 125 which receives a force in the tensile direction when the mold clamping force is generated. That is, the connection portion has the other end side (first end) of the inclined portion 123 connected to the toggle pin connection portion 124, the mold attachment plate 121 (second end) connected to the mold attachment portion 121a and forming a mold clamping force transmission path between the first end, and the branch portion 12 (third end) of the frame portion 125 branching from the transmission path, and has a screw hole 12a (mounting portion) to which a mounting part is attached at the third end. The branch portion 12 includes a plate that is L-shaped when viewed in the Z-axis direction as shown in FIG. 8 and T-shaped when viewed in the Y-axis direction as shown in FIG. 3. The screw hole 12a is formed on the side of the branch portion 12 opposite to the frame portion 125 (Y-axis positive direction side) as shown in FIG. 7, and extends in the Y-axis negative direction. The tip of the screw hole 12a is located outside the frame portion 125. The upper surface of the branch portion 12 is, for example, flush with the upper surface of the frame portion 125. The branch portion 12 and the screw hole 12 a are disposed on the outer side in the left-right direction (the positive Y-axis direction side) of an imaginary line connecting the pair of upper and lower toggle pin connection portions 124 .

This makes it possible to avoid stress concentration on the screw hole 12a provided in the branch section 12 when a clamping force is generated in the clamping device 100. It also makes it easier to ensure strength by avoiding stress concentration, improving design freedom. It also makes it possible to make the tensile force uniform between the frame section 125 in the operation direction and the anti-operation direction. This makes it possible to prevent twisting of the inclined section 123 and improve the uniformity of the surface pressure distribution of the clamping force. It also makes it possible to prevent additional machining or correction of the screw hole 12a from affecting the strength and quality (uniformity of the clamping force) of the movable platen 120.

In addition, a branch portion 13 protruding from the side surface S3 (side surface S3 on the Y-axis positive side) of the frame portion 125 on the opposite side of the operation side is provided. A screw hole (mounting portion) 13a for bolting an attachment part (for example, a bracket for holding a cableveyor (registered trademark)) is formed in the branch portion 13. As shown in FIG. 7, the branch portion 13 includes a rectangular plate when viewed in the X-axis direction. The screw hole 13a is formed in the side surface of the branch portion 13 opposite the frame portion 125 (Y-axis positive side) and extends in the Y-axis negative direction. The branch portion 13 and the screw hole 13a are arranged on the left-right outer side (Y-axis positive side) of the imaginary line connecting the upper and lower pair of toggle pin connection portions 124. Similarly, a branch portion 14 protruding from the side surface S4 (side surface S4 on the Y-axis negative side) of the operation side frame portion 125 is provided. A screw hole (mounting portion) 14a for bolting an attachment part is formed in the branch portion 14. As shown in FIG. 7, the branch portion 14 includes a rectangular plate when viewed in the X-axis direction. The screw hole 14a is formed on the side of the branch portion 14 opposite to the frame portion 125 (Y-axis negative direction side) and extends in the Y-axis positive direction. The tip of the screw hole 14a is arranged on the left-right outer side (Y-axis negative direction side) of the imaginary line connecting the pair of upper and lower toggle pin connection portions 124. In addition, the rear surface S5 of the frame portion 125 is provided with a branch portion 15 protruding from the rear surface S5. The branch portion 15 is formed with a screw hole (mounting portion) 15a for bolting a mounting part (e.g., an ejector device). As shown in FIG. 7, the branch portion 15 includes a right-angled trapezoid plate when viewed in the X-axis direction and includes an inclined surface that is inclined along the inner peripheral surface of the frame portion 125. The screw hole 15a is formed on the rear surface of the branch portion 15 and extends forward. The screw hole 15a is arranged on the left-right outer side of the imaginary line connecting the pair of upper and lower toggle pin connection portions 124. As shown in Fig. 7, the screw holes 13a and 14a are provided at positions different from the transmission path of the clamping force from the toggle pin connection part 124 to the mold attachment part 121a. Also, as shown in Fig. 6, the screw hole 15a is provided at a position different from the transmission path of the clamping force from the toggle pin connection part 124 to the mold attachment part 121a. Also, the screw hole 15a is formed so that a part of it reaches the side surfaces S3, S4 and the back surface S5 of the frame part 125 which receive a force in the pulling direction when the clamping force is generated. That is, the connection portion has the other end side (first end) of the inclined portion 123 connected to the toggle pin connection portion 124, a mold mounting plate 121 (second end) connected to the mold mounting portion 121a and forming a transmission path for the mold clamping force between the first end and the mold mounting plate 121 (second end), and branch portions 13, 14, 15 (third end) of the frame portion 125 branching off from the transmission path, and has screw holes 13a, 14a, 15a (mounting portions) at the third end to which mounting parts are attached.

By providing screw holes 13a, 14a, 15a in branching parts 13, 14, 15 protruding from side surfaces S3, S4 and rear surface S5, screw holes 13a, 14a, 15a that penetrate closer to frame part 125 than side surfaces S3, S4 and rear surface S5 can be made shorter. This makes it possible to reduce stress concentration due to screw holes 13a, 14a, 15a provided in branching parts 13, 14, 15.

In addition, the upper surface S6 of the mold mounting plate 121 is provided with branch portions 16 and 17 protruding from the upper surface S6. The branch portion 16 is provided with a screw hole (mounting portion) 16a for fixing a mounting part (e.g., an eye bolt for lifting the movable platen 120). As shown in FIG. 8, the branch portion 16 includes a rectangular plate when viewed in the Z-axis direction. For example, a pair of branch portions 16 are provided with a gap in the left-right direction (Y-axis direction). The pair of branch portions 16 are provided on the left-right outer sides of the inclined portion 123 and the toggle pin connection portion 124. The screw hole 16a is formed on the upper surface of the branch portion 16 and extends downward. The lower end of the screw hole 16a is disposed, for example, above the lower end of the toggle pin connection portion 124. The branch portion 17 is provided with a screw hole (mounting portion) 17a for bolting a mounting part (e.g., an air device). As shown in FIG. 8, the branching portion 17 includes a rectangular plate when viewed in the Z-axis direction. The branching portion 17 is provided in a pair at an interval in the left-right direction (Y-axis direction). The pair of branching portions 17 is provided between the pair of branching portions 16. The branching portion 17 is provided behind the center line that bisects the upper surface S6 of the mold mounting plate 121 in the front-rear direction (X-axis direction). The screw hole 17a is formed in the upper surface of the branching portion 17 and extends downward. The lower end of the screw hole 17a is disposed, for example, above the lower end of the toggle pin connection portion 124. Here, the mold clamping force is applied from the support base 122 provided in the center of the back surface of the mold mounting plate 121 toward the mold mounting portion 121a of the mold mounting plate 121. In other words, the branching portions 16 and 17 provided on the upper surface S6 of the mold mounting plate 121 are provided at positions branched off from the transmission path of the mold clamping force. That is, the connection portion has the other end side (first end) of the inclined portion 123 connected to the toggle pin connection portion 124, the surface (second end) of the mold mounting plate 121 connected to the mold mounting portion 121a and forming a mold clamping force transmission path between the first end and the surface (second end), and branch portions 16, 17 (third end) on the upper surface S6 of the mold mounting plate 121 branching off from the transmission path, and has screw holes 16a, 17a (mounting portions) at the third end for mounting mounting parts. This makes it possible to reduce stress concentration due to the screw holes 16a, 17a provided in the branch portions 16, 17.

In addition, a branch portion 18 is provided on the side surface S8 of the mold mounting plate 121 on the operation side. A screw hole (mounting portion) 18a for bolting a mounting part (e.g., a bracket for holding a connector) is formed in the branch portion 18. As shown in FIG. 6, the screw hole 18a is provided behind 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 to the inside in the left-right direction (Y-axis positive direction side). The tip of the screw hole 18a is disposed, for example, outside in the left-right direction (Y-axis negative direction side) from the support base 122. In addition, a branch portion 19 is provided on the side surface S9 of the mold mounting plate 121 on the opposite operation side. The branch portion 19 is provided with a screw hole (mounting portion) 19a for bolting a mounting part (e.g., a socket for controlling mold temperature, a thermocouple, and a bracket for holding air piping and water piping). The screw hole 19a, like the screw hole 18a, is provided behind 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 toward the inside in the left-right direction (Y-axis negative direction side). The tip of the screw hole 19a is disposed, for example, outside the support base 122 in the left-right direction (Y-axis positive direction side). As described above, the mold clamping force is applied from the support base 122 provided 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 provided on the side surfaces S8 and S9 of the mold mounting plate 121 are provided at positions branched off from the transmission path of the mold clamping force. That is, the connection portion has the other end (first end) of the inclined portion 123 connected to the toggle pin connection portion 124, the surface (second end) of the mold mounting plate 121 connected to the mold mounting portion 121a and forming a clamping force transmission path between the first end and the surface (second end), and branch portions 18, 19 (third end) of the side surfaces S8, S9 of the mold mounting plate 121 branching off from the transmission path, and has screw holes 18a, 19a (mounting portions) at the third end for mounting mounting parts. This makes it possible to reduce stress concentration due to the screw holes 18a, 19a provided in the branch portions 18, 19.

The above describes the embodiments of the injection molding machine, but the present invention is not limited to the above embodiments, and various modifications and improvements are possible within the scope of the gist of the present invention as described in the claims.

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

1 Injection molding machine 100 Mold clamping device 120 Movable platen 121 Mold mounting plate 121a Mold mounting portion 122 Support stand 123 Inclined portion 124 Toggle pin connection portion 125 Frame portion 126 Leg portions 11 to 19 Branch portions 11a to 19a Screw holes (mounting portions)

Claims (2)

A toggle pin connection;
A mold mounting portion;
a connection portion that connects the toggle pin connection portion and the mold attachment portion to form a transmission path for a mold clamping force,
The connection portion is
a first end connected to the toggle pin connection portion;
a second end portion connected to the mold attachment portion and forming the transmission path between the first end portion and the second end portion;
A third end portion branching off from the transmission path;
an inclined portion inclined from the toggle pin connection portion toward a center of a mold mounting plate having the mold mounting portion,
an upper surface of the inclined portion is an inclined surface that inclines from the toggle pin connection portion toward a center of a mold mounting plate having the mold mounting portion,
a protruding portion protruding upward from the inclined surface of the inclined portion,
The third end portion has an attachment portion to which an attachment part is attached to the protrusion .
Movable platen. The mounting portion is a screw hole.
The movable platen of claim 1 .

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