JP2018140612A - Injection molding machine and injection molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine capable of accurately measuring deformation caused by clamping of a member constituting a mold clamping device.SOLUTION: There is provided an injection molding machine, comprising: a mold clamping device that performs a contact and disconnection of a plurality of molds constituting a mold device; a displacement gauge that measures a displacement of a surface of a member constituting the mold clamping device in a predetermined direction orthogonal to a mold opening and closing direction; and a deformation measuring device that has a mold clamping data acquisition unit that acquires a measurement value of the displacement gauge in a mold clamping state. The deformation measuring device has a data acquisition unit for correction that acquires a change in a measurement value of the displacement gauge when a relative position between the displacement gauge and the member is changed in the mold opening and closing direction in a separated state at which the plurality of molds are separated.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an injection molding machine and an injection molding method.

  The injection molding machine described in Patent Document 1 includes a mold clamping device that performs mold closing, mold clamping, and mold opening of a mold apparatus. The mold clamping device includes, for example, a fixed platen to which a fixed mold is attached, a movable platen to which a movable mold is attached, and a toggle mechanism that advances and retracts the movable platen, and operates the toggle mechanism and moves the movable platen forward and backward. Perform mold closing, mold clamping and mold opening.

JP 2009-255592 A

  The members constituting the mold clamping device can be deformed by mold clamping. The deformation is represented by a displacement in a predetermined direction orthogonal to the mold opening / closing direction of the member surface. The displacement is measured by, for example, a laser displacement meter or a dial gauge.

  A surface for measuring displacement with a laser displacement meter or the like is difficult to be completely perpendicular to the predetermined direction, and is often slightly inclined with respect to the predetermined direction. Further, the surface on which displacement is measured with a laser displacement meter or the like may have irregularities.

  Therefore, when the members constituting the mold clamping device are displaced in the mold opening / closing direction by mold clamping, the displacement of the measurement surface is detected even if the members are not deformed. Therefore, the measurement accuracy of deformation due to mold clamping was low.

  The present invention has been made in view of the above problems, and a main object of the present invention is to provide an injection molding machine that can accurately measure deformation caused by mold clamping of members constituting the mold clamping apparatus.

In order to solve the above problems, according to one aspect of the present invention,
A mold clamping apparatus for separating and connecting a plurality of molds constituting the mold apparatus;
A displacement meter for measuring displacement in a predetermined direction orthogonal to the mold opening and closing direction of the surface of the member constituting the mold clamping device;
A deformation measuring device having a mold clamping data acquisition unit for acquiring a measurement value of the displacement meter in a mold clamping state,
The deformation measurement device acquires a change in a measurement value of the displacement meter when a relative position between the displacement meter and the member is changed in the mold opening / closing direction in a separated state where a plurality of the molds are separated from each other. An injection molding machine having a correction data acquisition unit is provided.

  According to one aspect of the present invention, there is provided an injection molding machine that can accurately measure deformation caused by mold clamping of members constituting the mold clamping apparatus.

It is a figure which shows the state at the time of mold opening completion of the injection molding machine by one Embodiment. It is a figure which shows the state at the time of the mold clamping of the injection molding machine by one Embodiment. It is a figure which shows the component of the control apparatus by one Embodiment with a functional block. It is a figure which shows the installation state of the toggle support displacement meter and movable platen displacement meter by one Embodiment. It is the figure which looked at the toggle support by one embodiment from the movable platen side. It is the figure which looked at the movable platen by one embodiment from the toggle support side. It is a figure which shows the displacement produced by the mold clamping of the measurement surface of the toggle support by one Embodiment. It is a figure which shows the displacement produced by the mold clamping of the measurement surface of the movable platen by one Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding components are denoted by the same or corresponding reference numerals, and description thereof will be omitted.

(Injection molding machine)
FIG. 1 is a diagram illustrating a state when mold opening of an injection molding machine according to an embodiment is completed. FIG. 2 is a diagram illustrating a state during mold clamping of the injection molding machine according to the embodiment. As shown in FIGS. 1 to 2, the injection molding machine includes a mold clamping device 100, an ejector device 200, an injection device 300, a moving device 400, and a control device 700. Hereinafter, each component of the injection molding machine will be described.

(Clamping device)
In the description of the mold clamping device 100, the moving direction of the movable platen 120 when the mold is closed (right direction in FIGS. 1 and 2) is the front, and the moving direction of the movable platen 120 when the mold is opened (left in FIGS. 1 and 2). (Direction) will be described as the rear.

  The mold clamping apparatus 100 performs mold closing, mold clamping, and mold opening of the mold apparatus 10 by separating and contacting the mold apparatus 10. The mold clamping device 100 is, for example, a horizontal mold, and the mold opening / closing direction is the horizontal direction. The mold clamping device 100 includes a fixed platen 110, a movable platen 120, a toggle support 130, a tie bar 140, a toggle mechanism 150, a mold clamping motor 160, a motion converting mechanism 170, and a mold thickness adjusting mechanism 180.

  The fixed platen 110 is fixed to the frame Fr. The fixed mold 11 is attached to the surface of the fixed platen 110 facing the movable platen 120.

  The movable platen 120 is movable in the mold opening / closing direction with respect to the frame Fr. A guide 101 for guiding the movable platen 120 is laid on the frame Fr. The movable mold 12 is attached to the surface of the movable platen 120 that faces the fixed platen 110.

  By moving the movable platen 120 forward and backward with respect to the fixed platen 110, mold closing, mold clamping, and mold opening are performed. The fixed mold 11 and the movable mold 12 constitute a mold apparatus 10.

  The toggle support 130 is connected to the fixed platen 110 at an interval, and is placed on the frame Fr so as to be movable in the mold opening / closing direction. The toggle support 130 may be movable along a guide laid on the frame Fr. 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 frame Fr, and the toggle support 130 is movable in the mold opening / closing direction with respect to the frame Fr. However, the toggle support 130 is fixed to the frame Fr and fixed to the fixed platen. 110 may be movable in the mold opening / closing direction with respect to the frame Fr.

  The tie bar 140 connects the fixed platen 110 and the toggle support 130 with an interval L in the mold opening / closing direction. A plurality of tie bars 140 may be used. Each tie bar 140 is parallel to the mold opening / closing direction and extends according to the mold clamping force. At least one tie bar 140 is provided with a tie bar distortion detector 141 that detects distortion of the tie bar 140. The tie bar distortion detector 141 sends a signal indicating the detection result to the control device 700. The detection result of the tie bar distortion detector 141 is used for detecting the clamping force.

  In this embodiment, the tie bar strain detector 141 is used as a mold clamping force detector for detecting the mold clamping force, but the present invention is not limited to this. The mold clamping force detector is not limited to the strain gauge type, and may be a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, and the like, and the mounting position thereof is 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 relative to the toggle support 130 in the mold opening / closing direction. The toggle mechanism 150 includes a cross head 151, a pair of links, and the like. Each link group includes a first link 152 and a second link 153 that are connected to each other by a pin or the like. The first link 152 is swingably attached to the movable platen 120 with a pin or the like, and the second link 153 is swingably attached to the toggle support 130 with a pin or the like. The second link 153 is attached to the crosshead 151 via the third link 154. When the crosshead 151 is moved back and forth with respect to the toggle support 130, the first link 152 and the second link 153 are bent and extended, and the movable platen 120 is moved back and forth relative to the toggle support 130.

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

  The mold clamping motor 160 is attached to the toggle support 130 and operates the toggle mechanism 150. The mold clamping motor 160 causes the first link 152 and the second link 153 to bend and extend by advancing and retracting the cross head 151 relative to the toggle support 130, and advances and retracts the movable platen 120 relative to the toggle support 130. The mold clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, a pulley, or the like.

  The motion conversion mechanism 170 converts the rotational motion of the mold clamping motor 160 into the linear motion of the cross head 151. The motion conversion mechanism 170 includes a screw shaft 171 and a screw nut 172 that is screwed onto the screw shaft 171. A ball or a roller may be interposed between the screw shaft 171 and the screw nut 172.

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

  In the mold closing process, the mold clamping motor 160 is driven to advance the cross head 151 to a mold closing completion position at a set speed, thereby moving the movable platen 120 forward and touching the movable mold 12 to the fixed mold 11. The position and speed of the cross head 151 are detected using, for example, a mold clamping motor encoder 161. The mold clamping motor encoder 161 detects the rotation of the mold clamping motor 160 and sends a signal indicating the detection result to the control device 700.

  In the mold clamping process, a mold clamping force is generated by further driving the mold clamping motor 160 to further advance the cross head 151 from the mold closing completion position to the mold clamping position. A cavity space 14 is formed between the movable mold 12 and the fixed mold 11 during mold clamping, and the injection device 300 fills the cavity space 14 with a liquid molding material. A molded product is obtained by solidifying the filled molding material. A plurality of cavity spaces 14 may be provided, and in this case, a plurality of molded products can be obtained simultaneously.

  In the mold opening process, the mold clamping motor 160 is driven to retract the cross head 151 to the mold opening completion position at a set speed, thereby retracting the movable platen 120 and separating the movable mold 12 from the fixed mold 11. Thereafter, the ejector device 200 ejects the molded product from the movable mold 12.

  Setting conditions in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. For example, the speed and position (including the speed switching position, the mold closing completion position, and the mold clamping position) of the cross head 151 in the mold closing process and the mold clamping process are collectively set as a series of setting conditions. Instead of the speed and position of the cross head 151, the speed and position of the movable platen 120 may be set. Further, a mold clamping force may be set instead of the position of the cross head (for example, the mold clamping position) or the position of the movable platen.

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

  When the thickness of the mold apparatus 10 changes due to replacement of the mold apparatus 10 or temperature change of the mold apparatus 10, the mold thickness adjustment is performed so that a predetermined mold clamping force can be obtained at the time of mold clamping. In the mold thickness adjustment, for example, the distance L between the fixed platen 110 and the toggle support 130 is set so that the link angle θ of the toggle mechanism 150 becomes a predetermined angle when the movable mold 12 touches the fixed mold 11. Adjust.

  The mold clamping apparatus 100 includes a mold thickness adjusting mechanism 180 that performs mold thickness adjustment by adjusting the distance L between the fixed platen 110 and the toggle support 130. The mold thickness adjusting mechanism 180 rotates a screw shaft 181 formed at the rear end portion of the tie bar 140, a screw nut 182 that is rotatably held by the toggle support 130, and a screw nut 182 that is screwed onto the screw shaft 181. And a mold thickness adjusting motor 183.

  The screw shaft 181 and the screw nut 182 are provided for each tie bar 140. The rotation of the mold thickness adjusting motor 183 may be transmitted to the plurality of screw nuts 182 via a rotation transmitting unit 185 configured by a belt, a pulley, or the like. A plurality of screw nuts 182 can be rotated synchronously. In addition, it is also possible to rotate the several screw nut 182 separately by changing the transmission path | route of the rotation transmission part 185. FIG.

  The rotation transmitting unit 185 may be configured with a gear or the like instead of a belt or a pulley. In this case, a passive 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 adjusting motor 183, and a plurality of passive gears and an intermediate gear that meshes with the drive gear are in the central portion of the toggle support 130. It is held rotatably.

  The operation of the mold thickness adjusting mechanism 180 is controlled by the control device 700. The control device 700 drives the mold thickness adjusting motor 183 to rotate the screw nut 182, thereby adjusting the position of the toggle support 130 that rotatably holds the screw nut 182 with respect to the fixed platen 110. The interval L with the toggle support 130 is adjusted.

  In this embodiment, the screw nut 182 is rotatably held with respect to the toggle support 130, and the tie bar 140 on which the screw shaft 181 is formed is fixed with respect to the fixed platen 110. However, the present invention is not limited to this.

  For example, the screw nut 182 may be rotatably held with respect to the fixed platen 110 and the tie bar 140 may be fixed with respect to the toggle support 130. In this case, the interval L can be adjusted by rotating the screw nut 182.

  Further, the screw nut 182 may be fixed to the toggle support 130, and the tie bar 140 may be held rotatably with respect to the fixed platen 110. In this case, the interval L can be adjusted by rotating the tie bar 140.

  Furthermore, the screw nut 182 may be fixed to the fixed platen 110, and the tie bar 140 may be held rotatably with respect to the toggle support 130. In this case, the interval L can be adjusted by rotating the tie bar 140.

  The interval L is detected using a mold thickness adjusting 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 adjusting motor encoder 184 is used for monitoring and controlling the position and interval L of the toggle support 130.

  The mold thickness adjusting mechanism 180 adjusts the interval L by rotating one of the screw shaft 181 and the screw nut 182 that are screwed together. A plurality of mold thickness adjusting mechanisms 180 may be used, and a plurality of mold thickness adjusting motors 183 may be used.

  The mold thickness adjusting mechanism 180 of this embodiment has a screw shaft 181 formed on the tie bar 140 and a screw nut 182 screwed to the screw shaft 181 in order to adjust the interval L. It is not limited to.

  For example, the mold thickness adjusting mechanism 180 may include a tie bar temperature controller that adjusts the temperature of the tie bar 140. The tie bar temperature controller is attached to each tie bar 140 and adjusts the temperature of the plurality of tie bars 140 in cooperation with each other. The higher the temperature of the tie bar 140, the larger the interval L. The temperature of the plurality of tie bars 140 can be adjusted independently.

  The tie bar temperature controller includes a heater such as a heater, and adjusts the temperature of the tie bar 140 by heating. The tie bar temperature controller may include a cooler such as a water cooling jacket, and the temperature of the tie bar 140 may be adjusted by cooling. The tie bar temperature controller may include both a heater and a cooler.

  The mold clamping device 100 of the present embodiment is a horizontal mold in which the mold opening / closing direction is the horizontal direction, but may be a vertical mold in which the mold opening / closing direction is the vertical direction. The vertical mold clamping apparatus includes a lower platen, an upper platen, a toggle support, a tie bar, a toggle mechanism, and a mold clamping motor. One of the lower platen and the upper platen is used as a fixed platen, and the other is used as a movable platen. A lower mold is attached to the lower platen, and an upper mold is attached to the upper platen. The lower die and the upper die constitute a mold apparatus. The lower mold may be attached to the lower platen via a rotary table. The toggle support is disposed below the lower platen. The toggle mechanism is disposed between the toggle support and the lower platen, and moves the movable platen up and down. The mold clamping motor operates a toggle mechanism. The tie bar is parallel to the vertical direction, passes through the lower platen, and connects the upper platen and the toggle support. When the mold clamping device is a saddle type, the number of tie bars is usually three. The number of tie bars is not particularly limited.

  The mold clamping device 100 according to the present embodiment includes the mold clamping motor 160 as a drive source, but may include a hydraulic cylinder instead of the mold clamping motor 160. The mold clamping device 100 may include a linear motor for opening and closing the mold and an electromagnet for mold clamping.

(Ejector device)
In the description of the ejector device 200, as in the description of the mold clamping device 100, the movement direction (right direction in FIGS. 1 and 2) of the movable platen 120 when the mold is closed is the front, and the movement of the movable platen 120 when the mold is opened. The direction (left direction in FIGS. 1 and 2) will be described as the rear.

  The ejector device 200 projects a molded product from the mold device 10. The ejector device 200 includes an ejector motor 210, a motion conversion mechanism 220, an ejector rod 230, and the like.

  The ejector motor 210 is attached to the movable platen 120. The ejector motor 210 is directly connected to the motion conversion mechanism 220, but may be connected to the motion conversion mechanism 220 via a belt, a pulley, or the like.

  The motion conversion mechanism 220 converts the rotational motion of the ejector motor 210 into the linear motion of the ejector rod 230. The motion conversion mechanism 220 includes a screw shaft and a screw nut that is screwed onto the screw shaft. A ball or a roller may be interposed between the screw shaft and the screw nut.

  The ejector rod 230 can be moved forward and backward in the through hole of the movable platen 120. The front end portion of the ejector rod 230 is in contact with the movable member 15 which is disposed inside the movable mold 12 so as to be able to advance and retract. The front end portion of the ejector rod 230 may or may not be connected to the movable member 15.

  The ejector device 200 performs the ejection process under the control of the control device 700.

  In the ejecting process, the ejector motor 210 is driven to advance the ejector rod 230 from the standby position to the ejecting position at a set speed, thereby moving the movable member 15 forward and ejecting the molded product. Thereafter, the ejector motor 210 is driven to retract the ejector rod 230 at a set speed, and the movable member 15 is retracted to the original standby position. The position and speed of the ejector rod 230 are detected using the ejector motor encoder 211, for example. The ejector motor encoder 211 detects the rotation of the ejector motor 210 and sends a signal indicating the detection result to the control device 700.

(Injection device)
In the description of the injection device 300, unlike the description of the mold clamping device 100 and the description of the ejector device 200, the moving direction of the screw 330 during filling (the left direction in FIGS. 1 and 2) is the front, and the screw 330 during weighing is used. The moving direction (right direction in FIGS. 1 and 2) will be described as the rear.

  The injection device 300 is installed on a slide base 301 that can move forward and backward with respect to the frame Fr, and can move forward and backward with respect to the mold device 10. The injection apparatus 300 is touched by the mold apparatus 10 and fills the cavity space 14 in the mold apparatus 10 with a molding material. The injection device 300 includes, for example, a cylinder 310, a nozzle 320, a screw 330, a metering motor 340, an injection motor 350, a pressure detector 360, and the like.

  The cylinder 310 heats the molding material supplied to the inside from the supply port 311. The supply port 311 is formed at the rear part 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. In front of the cooler 312, a heater 313 such as a band heater and a temperature detector 314 are provided on the outer periphery of the cylinder 310.

  The cylinder 310 is divided into a plurality of zones in the axial direction of the cylinder 310 (the left-right direction in FIGS. 1 and 2). A heater 313 and a temperature detector 314 are provided in each zone. For each zone, the control device 700 controls the heater 313 so that the temperature detected by the temperature detector 314 becomes a set temperature.

  The nozzle 320 is provided at the front end of the cylinder 310 and is pressed against the mold apparatus 10. 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 disposed in the cylinder 310 so as to be rotatable and movable back and forth. When the screw 330 is rotated, the molding material is fed forward along the spiral groove of the screw 330. The molding material is gradually melted by the heat from the cylinder 310 while being fed forward. As the liquid molding material is fed forward of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. Thereafter, when the screw 330 is advanced, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320 and filled in the mold apparatus 10.

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

  When the screw 330 is moved forward, the backflow prevention ring 331 is pushed backward by the pressure of the molding material in front of the screw 330 and retracts to a closed position (see FIG. 2) that closes the flow path of the molding material. 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 to open the flow path of the molding material. Advance to (see FIG. 1). Thereby, a molding material is sent ahead 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.

  The injection device 300 may have a drive source that advances and retracts the backflow prevention ring 331 between the open position and the closed position.

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

  The injection motor 350 moves the screw 330 back and forth. Between the injection motor 350 and the screw 330, a motion conversion mechanism for converting the rotational motion of the injection motor 350 into the linear motion of the screw 330 is provided. The motion conversion mechanism includes, for example, a screw shaft and a screw nut that is screwed onto the screw shaft. A ball, a roller, or the like may be provided between the screw shaft and the screw nut. The drive source for moving the screw 330 back and forth is not limited to the injection motor 350, and may be a hydraulic cylinder, for example.

  The pressure detector 360 detects the pressure transmitted between the injection motor 350 and the screw 330. The pressure detector 360 is provided in a force transmission path between the injection motor 350 and the screw 330 and detects the pressure acting on the pressure detector 360.

  The pressure detector 360 sends a signal indicating the detection result to the control device 700. The detection result of the pressure detector 360 is used for control and monitoring of the pressure received by the screw 330 from the molding material, the back pressure against the screw 330, the pressure acting on the molding material from the screw 330, and the like.

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

  In the filling step, the injection motor 350 is driven to advance the screw 330 at a set speed, and the liquid molding material accumulated in front of the screw 330 is filled into the cavity space 14 in the mold apparatus 10. The position and speed of the screw 330 are detected using, for example, 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, switching from the filling process to the pressure holding process (so-called V / P switching) is performed. A position where the V / P switching is performed is also referred to as a V / P switching position. The set speed of the screw 330 may be changed according to the position and time of the screw 330.

  In addition, after the position of the screw 330 reaches the set position in the filling process, the screw 330 may be temporarily stopped at the set position, and then 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 the pressure holding process, 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 maintained at a set pressure, The remaining molding material is pushed toward the mold apparatus 10. Insufficient molding material due to cooling shrinkage in the mold apparatus 10 can be replenished. The holding pressure is detected using a pressure detector 360, for example. The pressure detector 360 sends a signal indicating the detection result to the control device 700. The set value of the holding pressure may be changed according to the elapsed time from the start of the pressure holding process.

  In the pressure holding process, the molding material in the cavity space 14 in the mold apparatus 10 is gradually cooled, and when the pressure holding process is completed, the inlet of the cavity space 14 is closed with the solidified molding material. This state is called a gate seal, and the backflow of the molding material from the cavity space 14 is prevented. After the pressure holding process, the cooling process is started. In the cooling process, the molding material in the cavity space 14 is solidified. In order to shorten the molding cycle, a metering step may be performed during the cooling step.

  In the metering step, the metering motor 340 is driven to rotate the screw 330 at a set rotational speed, and the molding material is fed forward along the spiral groove of the screw 330. Along with this, the molding material is gradually melted. As the liquid molding material is fed forward of the screw 330 and accumulated in the front of the cylinder 310, the screw 330 is retracted. The number of rotations of the screw 330 is detected by using, for example, a weighing motor encoder 341. The weighing motor encoder 341 detects the rotation of the weighing motor 340 and sends a signal indicating the detection result to the control device 700.

  In the metering step, the set back pressure may be applied to the screw 330 by driving the injection motor 350 in order to limit the rapid retreat of the screw 330. The back pressure with respect to the screw 330 is detected using, for example, a pressure detector 360. The pressure detector 360 sends a signal indicating the detection result to the control device 700. When the screw 330 is retracted to the measurement completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the measurement process is completed.

  In addition, although the injection apparatus 300 of this embodiment is an inline screw system, a pre-plastic system etc. may be sufficient. A pre-plastic injection device supplies a molding material melted in a plasticizing cylinder to the injection cylinder, and injects the molding material from the injection cylinder into a mold device. In the plasticizing cylinder, a screw is rotatably or rotatably and reciprocally disposed, and in the injection cylinder, a plunger is reciprocally disposed.

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

(Moving device)
In the description of the moving device 400, similarly to the description of the injection device 300, the moving direction of the screw 330 during filling (the left direction in FIGS. 1 and 2) is the front, and the moving direction of the screw 330 during weighing (see FIGS. 1 and 2). In the following description, the right direction in FIG.

  The moving device 400 moves the injection device 300 forward and backward with respect to the mold device 10. Further, the moving device 400 presses the nozzle 320 against the mold device 10 to generate a 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 bi-directionally rotatable pump, and by switching the rotation direction of the motor 420, hydraulic fluid (for example, oil) is sucked from one of the first port 411 and the second port 412 and discharged from the other. Then, hydraulic pressure is generated. The hydraulic pump 410 can also suck the working fluid from the tank and discharge the working fluid from either the first port 411 or the second port 412.

  The motor 420 operates the hydraulic pump 410. The motor 420 drives the hydraulic pump 410 with a rotation direction and a rotation 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 includes a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed with respect to the injection device 300. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. The piston rod 433 is fixed to the fixed platen 110.

  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, whereby the injection device 300 is pushed forward. The injection device 300 is advanced, and the nozzle 320 is pressed against the fixed mold 11. The front chamber 435 functions as a pressure chamber that generates the nozzle touch pressure of the nozzle 320 by the pressure of the hydraulic fluid supplied from the hydraulic pump 410.

  On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via the second flow path 402. The hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 through the second flow path 402, whereby the injection device 300 is pushed backward. The injection device 300 is retracted, and the nozzle 320 is separated from the fixed mold 11.

  In the present embodiment, the moving device 400 includes the 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 a linear motion of the injection device 300 may be used.

(Control device)
The control device 700 includes a CPU (Central Processing Unit) 701, a storage medium 702 such as a memory, an input interface 703, and an output interface 704 as shown in FIGS. The control device 700 performs various controls by causing the CPU 701 to execute a program stored in the storage medium 702. In addition, 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.

  The control device 700 repeatedly manufactures a molded product by repeatedly performing a mold closing process, a mold clamping process, a mold opening process, and the like. In addition, the control device 700 performs a weighing process, a filling process, a pressure holding process, and the like during the mold clamping process. A series of operations for obtaining a molded product, for example, operations from the start of the weighing process to the start of the next weighing process are also referred to as “shots”. The time required for one shot is also referred to as a “molding cycle”.

  The control device 700 is connected to the operation device 750 and the display device 760. The operation device 750 receives an input operation by a user and outputs a signal corresponding to the input operation to the control device 700. The display device 760 displays an operation screen corresponding to an input operation on the operation device 750 under the control of the control device 700.

  The operation screen is used for setting the injection molding machine. A plurality of operation screens are prepared and displayed by switching or overlapping. The user performs settings of the injection molding machine (including input of set values) by operating the operation device 750 while viewing the operation screen displayed on the display device 760.

  The operation device 750 and the display device 760 may be configured with a touch panel, for example, and may be integrated. In addition, although the operating device 750 and the display device 760 of this embodiment are integrated, you may provide independently. In addition, a plurality of operation devices 750 may be provided.

(Measurement of deformation due to clamping force of components of clamping device)
The control device 700 has a function as a deformation measuring device that measures deformation caused by mold clamping of a member constituting the mold clamping device 100 (hereinafter also simply referred to as “component member”). The deformation caused by mold clamping is represented by displacement in a direction perpendicular to the mold opening / closing direction. For example, the movable platen 120, the toggle support 130, and the like can be cited as examples of the constituent members for deformation measurement.

  Note that the structural member to be deformed may be any member that can move in the mold opening / closing direction with respect to the frame Fr. For example, as described above, when the fixed platen 110 can be moved in the mold opening / closing direction with respect to the frame Fr instead of the toggle support 130, the deformation measurement target component may be the fixed platen 110 instead of the toggle support 130.

  FIG. 3 is a diagram illustrating functional elements of the control device according to the embodiment. Each functional block illustrated in FIG. 3 is conceptual and does not necessarily need to be physically configured as illustrated. All or a part of each functional block can be configured to be functionally or physically distributed and integrated in arbitrary units. Each processing function performed in each functional block may be realized entirely or arbitrarily by a program executed by the CPU, or may be realized as hardware by wired logic.

  The control device 700 is connected to a displacement meter 800 that measures displacement in a predetermined direction orthogonal to the mold opening / closing direction on the surface of the component of the mold clamping device 100. The displacement meter 800 is fixed to the frame Fr that supports the mold clamping device 100, and measures the displacement in the predetermined direction of the component member surface of the mold clamping device 100 with respect to the frame Fr. Hereinafter, the surface of the constituent member whose displacement is measured by the displacement meter 800 is also referred to as a measurement surface. As the displacement meter 800, for example, as shown in FIG. 4, a toggle support displacement meter 801 that measures the displacement of the measurement surface of the toggle support 130, a movable platen displacement meter 802 that measures the displacement of the measurement surface of the movable platen 120, and the like are used. It is done.

  The control device 700 is connected to a correction displacement meter 900 that measures the displacement of the constituent members of the mold clamping device 100 in the mold opening / closing direction. The correction displacement meter 900 is fixed to the frame Fr that supports the mold clamping device 100, and measures the displacement of the constituent members of the mold clamping device 100 with respect to the frame Fr in the mold opening / closing direction. As the correction displacement meter 900, for example, as shown in FIG. 4, a mold opening / closing direction displacement meter 901 that measures the displacement of the toggle support 130 in the mold opening / closing direction, and a mold opening / closing direction displacement meter that measures the displacement of the movable platen 120 in the mold opening / closing direction. 902 or the like is used.

  The control device 700 is, for example, a separated state in which a mold clamping data acquisition unit 711 that acquires a measurement value of the displacement meter 800 in a mold clamping state and a plurality of molds (for example, the fixed mold 11 and the movable mold 12) are separated. The correction data acquisition unit 712 acquires the change in the measured value of the displacement meter 800 when the relative position between the displacement meter 800 and the component member is changed in the mold opening / closing direction. The mold clamping data acquisition unit 711 acquires displacement data due to mold clamping of the measurement surface, and the correction data acquisition unit 712 acquires correction data used for correcting the displacement data acquired by the mold clamping data acquisition unit 711. The control device 700 further includes a mold clamping data correction unit 713 that corrects displacement data acquired by the mold clamping data acquisition unit 711 using the correction data acquired by the correction data acquisition unit 712. Furthermore, the control device 700 may include an output control unit 714 that outputs displacement data after correction.

  The deformation measurement device may be provided separately from the control device 700. In this case, the deformation measuring device may be connected to the control device 700 via a network such as a LAN (Local Area Network) or an Internet line so that the mold clamping device 100 can be operated. The connection may be either a wired connection or a wireless connection.

  FIG. 4 is a diagram illustrating an installation state of a toggle support displacement meter and a movable platen displacement meter according to an embodiment. 4A shows a state when the mold opening is completed, and FIG. 4B shows a state when the mold is closed. In FIG. 4, an X direction, a Y direction, and a Z direction are directions perpendicular to each other. The X direction is the mold opening / closing direction. When the mold clamping device 100 is a horizontal mold, the X direction and the Y direction are horizontal directions, and the Z direction is a vertical direction. FIG. 5 is a view of the toggle support according to the embodiment as viewed from the movable platen side. FIG. 6 is a view of the movable platen according to the embodiment as viewed from the toggle support side.

  As shown in FIG. 4, the toggle support 130 includes a toggle support main body 131 to which the tie bar 140 and the motion conversion mechanism 170 are attached, and a toggle support link attachment portion to which the swing shaft 155 of the second link 153 of the toggle mechanism 150 is attached. 132. The toggle support main body part 131 and the toggle support link attaching part 132 may be integrally formed by casting or the like.

  The toggle support main body 131 has a plate-like portion formed in a substantially rectangular shape when viewed in the X direction. The plate-like portion has a through hole in the central portion through which the screw shaft 171 of the motion conversion mechanism 170 is inserted. The toggle support main body 131 may further include a cylindrical portion that protrudes in one direction (forward) in the X direction from the outer peripheral edge of the plate-like portion, in addition to the plate-like portion. The cylindrical portion is formed in a square frame shape when viewed in the X direction, and forms a space in which the cross head 151 moves.

  A pair of toggle support link mounting portions 132 is provided at a central portion in the Y direction on the surface (front surface) of the toggle support main body portion 131 facing the movable platen 120 at an interval in the Z direction. Each toggle support link mounting portion 132 has a plurality of link mounting plates perpendicular to the Y direction at intervals in the Y direction.

  Each link mounting plate protrudes forward from the surface (front surface) of the toggle support main body 131 facing the movable platen 120. A through hole penetrating the link mounting plate in the Y direction is formed at the tip of each link mounting plate. By inserting the swing shaft 155 into the through hole, the second link 153 is swingably attached to the toggle support link mounting portion 132 via the swing shaft 155.

  As shown in FIG. 4, the movable platen 120 includes a movable platen main body 121 to which the movable mold 12 is attached, and a movable platen link attachment portion 122 to which the swing shaft 156 of the first link 152 of the toggle mechanism 150 is attached. Have. The movable platen main body 121 and the movable platen link mounting portion 122 may be integrally formed by casting or the like.

  The movable platen main body 121 has a plate-like portion formed in a substantially rectangular shape when viewed in the X direction. Cutouts may be formed along the tie bars 140 at the four corners of the plate-like portion. Instead of the notch, a through hole into which the tie bar 140 is inserted may be formed. The plate-like part has a through hole at the center part through which the ejector rod 230 is inserted. In addition to the plate-like portion, the movable platen main body 121 may further include a cylindrical portion that protrudes in one direction (rearward) in the X direction from the outer peripheral edge of the plate-like portion. The cylindrical portion is formed in a rectangular frame shape when viewed in the X direction, and forms a space in which at least a part of the ejector device 200 is accommodated.

  A pair of the movable platen link attaching portions 122 is provided at an interval in the Z direction at the center in the Y direction of the surface (rear surface) facing the toggle support 130 in the movable platen main body 121. Each movable platen link attachment portion 122 has a plurality of link attachment plates perpendicular to the Y direction at intervals in the Y direction.

  Each link mounting plate protrudes rearward from a surface (rear surface) facing the toggle support 130 in the movable platen main body 121. A through hole penetrating the link mounting plate in the Y direction is formed at the tip of each link mounting plate. By inserting the swing shaft 156 into the through hole, the first link 152 is swingably attached to the movable platen link mounting portion 122 via the swing shaft 156.

  The toggle support displacement meter 801 measures the Z direction displacement of the measurement surface 811 of the toggle support 130. The toggle support displacement meter 801 is composed of, for example, a non-contact type laser displacement meter. The laser displacement meter includes, for example, a light projecting element that projects a light beam toward the measurement surface 811 and a light receiving element that receives the light beam reflected by the measurement surface 811. The laser displacement meter measures the displacement in the Z direction of the measurement surface 811 by measuring the distance in the Z direction with respect to the measurement surface 811. The toggle support displacement meter 801 may be configured with a contact dial gauge or the like.

  The measurement surface of the toggle support displacement meter 801 is not particularly limited, and may include one or more measurement surfaces among the measurement surfaces 811 to 824 shown in at least one of FIGS. 4 and 5. The combination of a plurality of measurement surfaces is not particularly limited. The displacement of a plurality of measurement surfaces may be measured by a plurality of toggle support displacement meters 801.

  The two measurement surfaces 811 and 812 are set so as to overlap with a connecting portion (for example, the swing shaft 155 of the second link 153) of the toggle support link mounting portion 132 with the second link 153 in the Z direction view. By measuring the displacement in the Z direction of these measurement surfaces 811 and 812, the deformation in the Z direction of the toggle support link mounting portion 132 by the swing shaft 155 can be measured.

  The four measurement surfaces 813 to 816 are set so as to overlap with a connection portion (for example, a connection portion between the screw shaft 181 and the screw nut 182 formed on the tie bar 140) of the toggle support main body 131 in the Z direction view. The If the displacements in the Z direction of these four measurement surfaces 813 to 816 are measured, the deformation in the Z direction of the toggle support main body 131 by the four tie bars 140 can be measured.

  The four measurement surfaces 817 to 820 are set so as to overlap with a connecting portion of the toggle support main body 131 with the tie bar 140 as viewed in the Y direction. If the displacement on these four measurement surfaces 817 to 820 is measured, the deformation in the Y direction of the toggle support main body 131 by the four tie bars 140 can be measured.

  The two measurement surfaces 821 and 822 are set so as to overlap with a connection portion (for example, the bearing 173 of the screw shaft 171 of the motion conversion mechanism 170) with the motion conversion mechanism 170 of the toggle support main body 131 when viewed in the Z direction. If the displacements in the Z direction of these measurement surfaces 821 and 822 are measured, the deformation in the Z direction of the toggle support main body 131 by the motion conversion mechanism 170 can be measured.

  The two measurement surfaces 823 and 824 are set so as to overlap with a connection portion with the motion conversion mechanism 170 of the toggle support main body 131 when viewed in the Y direction. By measuring the displacement of these measurement surfaces 823 and 824 in the Y direction, the deformation of the toggle support main body 131 by the motion conversion mechanism 170 in the Y direction can be measured.

  Next, correction of displacement data of the measurement surface 811 will be described with reference to FIG. Since the correction of the displacement data of the other measurement surfaces 812 to 822 is the same, the description thereof is omitted. FIG. 7 is a diagram illustrating displacement caused by clamping of the measurement surface of the toggle support according to the embodiment. In FIG. 7, the solid line indicates the position when the mold opening of the measurement surface 811 is completed, the broken line indicates the position where the measurement surface 811 is moved backward from the position when the mold opening is completed, and the two-dot chain line indicates the position when the measurement surface 811 is clamped. Indicates. In FIG. 7, the alternate long and short dash line indicates the center line of the toggle support displacement meter 801.

  The mold clamping data acquisition unit 711 acquires displacement data ΔZ due to mold clamping of the measurement surface 811 using the toggle support displacement meter 801.

  The measurement surface 811 may be inclined with respect to a surface that is completely perpendicular to the Z direction. In FIG. 7, the measurement surface 811 is inclined upward as it goes forward. Note that the measurement surface 811 may be inclined downward toward the front. An angle α formed between the measurement surface 811 and a surface completely perpendicular to the Z direction when viewed in the Y direction is also referred to as an inclination angle α of the measurement surface 811.

  The measurement surface 811 is displaced, for example, from a position indicated by a solid line in FIG. 7 to a position indicated by a two-dot chain line in FIG. 7 by clamping. A displacement ΔZ in the Z direction of the measurement surface 811 of the toggle support 130 represents a deformation of the toggle support 130.

  By the way, since the toggle support 130 can be moved forward and backward with respect to the frame Fr, the toggle support 130 is pushed rearward during mold clamping. The retraction amount ΔX caused by the clamping of the toggle support 130 corresponds to the amount of elongation caused by the clamping of the tie bar 140.

  When the measurement surface 811 of the toggle support 130 is tilted with respect to a completely vertical surface with respect to the Z direction, the displacement ΔZ measured by the toggle support displacement meter 801 includes a displacement ΔZ1 caused by the retraction of the measurement surface 811. The displacement ΔZ1 is caused by the backward movement of the toggle support 130, and is not caused by the deformation of the toggle support 130. Therefore, the displacement ΔZ1 is an error.

  Therefore, the correction data acquisition unit 712 toggles when the relative position between the toggle support displacement meter 801 and the toggle support 130 is changed in the X direction in a separated state where the fixed mold 11 and the movable mold 12 are separated from each other. A change in the measured value of the support displacement meter 801 is acquired. The separated state is a state where no mold clamping force is generated. In the separated state, the movable platen 120 may be stopped or moved, and the moving direction may be the mold closing direction or the mold opening direction. The separated state may be a mold open state.

  The mold apparatus 10 may further include an intermediate mold between the fixed mold 11 and the movable mold 12. In this case, the separated state may be a state where the fixed mold 11 and the intermediate mold are separated and the intermediate mold and the movable mold 12 are separated. The number of molds constituting the mold apparatus 10 may be two or more.

  In order to change the relative position of the toggle support displacement meter 801 and the toggle support 130 in the X direction, in this embodiment, the toggle support 130 is moved in the X direction as described later. However, the toggle support displacement meter 801 is moved in the X direction. It may be moved to.

  In order to change the relative position of the toggle support displacement meter 801 and the toggle support 130 in the X direction in the separated state, the correction data acquisition unit 712 operates the mold thickness adjusting mechanism 180 to move the toggle support 130 in the X direction. .

  According to the present embodiment, the relative position between the toggle support displacement meter 801 and the toggle support 130 can be changed in the X direction using the mold thickness adjusting mechanism 180 that is mounted as standard on the mold clamping device 100.

  When the measurement surface 811 is a flat surface processed in advance, the magnitude and direction of the movement of the toggle support 130 in the X direction are not particularly limited. The inclination angle α of the measurement surface 811 can be calculated based on the amount of movement of the toggle support 130 in the X direction and the amount of change in the measurement value of the toggle support displacement meter 801 regardless of the magnitude and direction of movement.

  When calculating the inclination angle α of the measurement surface 811, the correction data acquisition unit 712 may acquire the measurement value of the toggle support displacement meter 801 only before and after the movement of the toggle support 130. The measurement value of the toggle support displacement meter 801 may be acquired three or more times by changing the position of the toggle support 130 in the X direction.

  The correction data acquisition unit 712 may acquire the surface profile of the measurement surface 811 instead of the inclination angle α of the measurement surface 811 or in addition to the inclination angle α of the measurement surface 811. In this case, the measurement value of the toggle support displacement meter 801 and the change of the X-direction position of the toggle support 130 are repeatedly performed. A case where the measurement surface 811 has irregularities can also be handled.

  The amount of movement of the toggle support 130 in the X direction is measured by a mold thickness adjusting motor encoder 184 or a dedicated mold opening / closing direction displacement meter 901. The mold opening / closing direction displacement meter 901 may be configured in the same manner as the toggle support displacement meter 801.

  As will be described in detail later, the mold opening / closing direction displacement meter 901 can also be used for measuring the retraction amount ΔX (see FIG. 7) generated by mold clamping of the toggle support 130. Since the retraction amount ΔX corresponds to the extension amount of the tie bar 140, it can also be measured by the tie bar distortion detector 141.

  The correction data acquisition unit 712 may acquire a retraction amount ΔX (see FIG. 7) generated by mold clamping of the toggle support 130 as the correction data. The error ΔZ1 can be calculated from the retraction amount ΔX and the inclination angle α of the measurement surface 811. Further, the error ΔX can be calculated from the retraction amount ΔX and the surface profile of the measurement surface 811.

  The correction data acquisition unit 712 may acquire the measurement value of the toggle support displacement meter 801 at the position as the correction data when the position where the toggle support 130 moves backward by the mold clamping is known.

  Here, the position where the toggle support 130 is retracted by mold clamping may be the predicted position or the actual position. Either the acquisition of correction data by the correction data acquisition unit 712 or the acquisition of displacement data by mold clamping of the measurement surface 811 by the mold clamping data acquisition unit 711 may be performed first.

  The mold clamping data correction unit 713 corrects the displacement ΔZ acquired by the mold clamping data acquisition unit 711 with correction data (for example, the inclination angle α and the retraction amount ΔX) acquired by the correction data acquisition unit 712. Specifically, the mold clamping data correction unit 713 subtracts the error ΔZ1 from the displacement ΔZ. A displacement ΔZ2 obtained by subtracting the error ΔZ1 from the displacement ΔZ represents the deformation of the toggle support 130. Therefore, the influence of the inclination angle α of the measurement surface 811 can be eliminated, and the deformation of the toggle support 130 can be measured with high accuracy.

  The movable platen displacement meter 802 measures the Z direction displacement of the measurement surface 831 of the movable platen 120. The movable platen displacement meter 802 is configured by, for example, a non-contact type laser displacement meter, like the toggle support displacement meter 801. The movable platen displacement meter 802 may be configured with a contact dial gauge or the like.

  The measurement surface of movable platen displacement meter 802 is not particularly limited, and may include one or more measurement surfaces among measurement surfaces 831 to 836 shown in at least one of FIGS. 4 and 6. The combination of a plurality of measurement surfaces is not particularly limited. The displacement of the plurality of measurement surfaces may be measured by a plurality of movable platen displacement meters 802.

  The two measurement surfaces 831 and 832 are set so as to overlap with a connection portion (for example, the swing shaft 156 of the first link 152) of the movable platen link mounting portion 122 with the first link 152 in the Z direction view. By measuring the displacement in the Z direction of these measurement surfaces 831 and 832, it is possible to measure the deformation in the Z direction of the movable platen link mounting portion 122 by the swing shaft 156.

  The two measurement surfaces 833 to 834 are set so as to overlap the center of the movable platen main body 121 when viewed in the Z direction. If the displacement in the Z direction of these two measurement surfaces 833 to 834 is measured, the deformation in the Z direction at the center of the movable platen main body 121 can be measured.

  The two measurement surfaces 835 to 836 are set so as to overlap the center of the movable platen main body 121 when viewed in the Y direction. By measuring the displacement in the Y direction of these two measurement surfaces 835 to 836, the deformation in the Y direction at the center of the movable platen main body 121 can be measured.

  Next, correction of displacement data of the measurement surface 831 will be described with reference to FIG. Since the correction of the displacement data of the other measurement surfaces 832 to 836 is the same, the description thereof is omitted. FIG. 8 is a diagram illustrating displacement caused by clamping of the measurement surface of the movable platen according to the embodiment. In FIG. 8, the solid line is the position when the mold opening of the measurement surface 831 is completed, the broken line is the position where the measurement surface 831 is moved forward from the position when the mold opening is completed, and the two-dot chain line is the position when the measurement surface 831 is clamped Indicates. In FIG. 8, the alternate long and short dash line indicates the center line of the movable platen displacement meter 802.

  The mold clamping data acquisition unit 711 acquires displacement data ΔZ due to mold clamping of the measurement surface 831 using the movable platen displacement meter 802.

  The measurement surface 831 may be inclined with respect to a surface that is completely perpendicular to the Z direction. In FIG. 8, the measurement surface 831 is inclined downward toward the front. Note that the measurement surface 831 may be inclined upward as it goes forward. An angle β formed between the measurement surface 831 and a surface completely perpendicular to the Z direction when viewed in the Y direction is also referred to as an inclination angle β of the measurement surface 831.

  For example, the measurement surface 831 is displaced from the position indicated by a solid line in FIG. 8 to the position indicated by a two-dot chain line in FIG. 8 by clamping. A displacement ΔZ in the Z direction of the measurement surface 831 of the movable platen 120 represents a deformation of the movable platen 120.

  By the way, since the movable platen 120 is movable forward and backward with respect to the frame Fr, the movable platen 120 is pushed forward and moved forward during mold clamping. The amount of advance ΔX caused by mold clamping of the movable platen 120 corresponds to the amount of shrinkage caused by mold clamping of the mold apparatus 10.

  When the measurement surface 831 of the movable platen 120 is inclined with respect to a complete vertical surface with respect to the Z direction, the displacement ΔZ measured by the movable platen displacement meter 802 includes a displacement ΔZ1 generated by the advancement of the measurement surface 831. The displacement ΔZ1 is caused by the advance of the movable platen 120 and is not caused by the deformation of the movable platen 120. Therefore, the displacement ΔZ1 is an error.

  Therefore, the correction data acquisition unit 712 acquires a change in the measurement value of the movable platen displacement meter 802 when the relative position between the movable platen displacement meter 802 and the movable platen 120 is changed in the X direction in the separated state.

  In order to change the relative position between the movable platen displacement meter 802 and the movable platen 120 in the X direction, in this embodiment, the movable platen 120 is moved in the X direction as described later. However, the movable platen displacement meter 802 is moved in the X direction. It may be moved to.

  The correction data acquisition unit 712 operates the toggle mechanism 150 to move the movable platen 120 in the X direction in order to change the relative position between the movable platen displacement meter 802 and the movable platen 120 in the X direction in the separated state.

  According to this embodiment, the relative position of the movable platen displacement meter 802 and the movable platen 120 can be changed in the X direction using the toggle mechanism 150 that is mounted on the mold clamping device 100 as a standard. Instead of the toggle mechanism 150, a mold thickness adjusting mechanism 180 may be used.

  When the measurement surface 831 is a flat surface processed in advance, the magnitude and direction of movement of the movable platen 120 in the X direction are not particularly limited. Regardless of the magnitude and direction of movement, the tilt angle β of the measurement surface 831 can be calculated based on the amount of movement of the movable platen 120 in the X direction and the amount of change in the measurement value of the movable platen displacement meter 802.

  Note that when the movable platen 120 is moved in the X direction in the separated state, the movable platen 120 may be retracted so that a mold clamping force is not generated. When the mold apparatus 10 is not attached to the mold clamping apparatus 100, the movable platen 120 may be advanced.

  When calculating the inclination angle β of the measurement surface 831, the correction data acquisition unit 712 may acquire the measurement value of the movable platen displacement meter 802 only twice before and after the movement of the movable platen 120. The measurement value of the movable platen displacement meter 802 may be acquired three or more times by changing the position of the movable platen 120 in the X direction.

  The correction data acquisition unit 712 may acquire the surface profile of the measurement surface 831 instead of the inclination angle β of the measurement surface 831 or in addition to the inclination angle β of the measurement surface 831. In this case, the measurement value of the movable platen displacement meter 802 and the change of the X direction position of the movable platen 120 are repeatedly performed. A case where the measurement surface 831 has irregularities can also be handled.

  The amount of movement of the movable platen 120 in the X direction is determined by the mold clamping motor encoder 161 (the mold thickness adjusting motor encoder 184 when the mold thickness adjusting mechanism 180 is operated instead of operating the toggle mechanism 150) or a dedicated mold opening / closing. Measurement is performed by a directional displacement meter 902. The mold opening / closing direction displacement meter 902 may be configured similarly to the movable platen displacement meter 802.

  As will be described in detail later, the mold opening / closing direction displacement meter 902 can also be used to measure the advance amount ΔX (see FIG. 8) generated by the mold clamping of the movable platen 120.

  The correction data acquisition unit 712 may acquire the advance amount ΔX (see FIG. 8) generated by the mold clamping of the movable platen 120 as the correction data. The error ΔZ1 can be calculated from the advance amount ΔX and the inclination angle β of the measurement surface 831. Further, the error ΔX can be calculated from the advance amount ΔX and the surface profile of the measurement surface 831.

  When the position where the movable platen 120 moves forward is known, the correction data acquisition unit 712 may acquire the measurement value of the movable platen displacement meter 802 at that position as correction data.

  Here, the position advanced by the mold clamping of the movable platen 120 may be a predicted position or an actual position. Either the acquisition of correction data by the correction data acquisition unit 712 or the acquisition of displacement data by mold clamping of the measurement surface 831 by the mold clamping data acquisition unit 711 may be performed first.

  The mold clamping data correction unit 713 corrects the displacement ΔZ acquired by the mold clamping data acquisition unit 711 with correction data (for example, the inclination angle β and the advance amount ΔX) acquired by the correction data acquisition unit 712. Specifically, the mold clamping data correction unit 713 subtracts the error ΔZ1 from the displacement ΔZ. A displacement ΔZ2 obtained by subtracting the error ΔZ1 from the displacement ΔZ represents the deformation of the movable platen 120. Therefore, the influence of the inclination angle β of the measurement surface 831 can be eliminated, and the deformation of the movable platen 120 can be accurately measured.

  The output control unit 714 outputs the displacement data corrected by the mold clamping data correction unit 713. The output is performed in the form of an image or sound, and as the output device, a display device 760, a warning light, a buzzer, or the like is used. User convenience can be improved.

  The output control unit 714 may output an alarm when the corrected displacement data is outside the allowable range. The alarm output can alert the user and prompt the user to repair the injection molding machine. A plurality of types of alarms may be prepared.

(Deformation and improvement)
The embodiments of the injection molding machine and the injection molding method have been described above, but the present invention is not limited to the above embodiments and the like, and within the scope of the gist of the present invention described in the claims, Various modifications and improvements are possible.

  For example, the control device 700 may include a stress distribution detection unit that detects the stress distribution of the measurement target based on the displacement of each measurement point of the measurement target such as the toggle support 130 and the movable platen 120. If the displacement of each measurement point is isotropic, it is determined that the stress distribution is isotropic. If the displacement of one measurement point is larger than the displacement of another measurement point, it is determined that stress is concentrated at the position of the measurement point having a large displacement.

  In addition, the control device 700 may include a deterioration degree detection unit that detects the degree of deterioration of the measurement object based on the displacement of each measurement point of the measurement object. As the measurement object deteriorates, the displacement balance of each measurement point tends to be lost. Therefore, the degree of deterioration of the measurement object can be estimated from the balance of displacement at each measurement point.

  Moreover, the control apparatus 700 may have a machine life determination part which determines a machine life based on the displacement of each measurement point of a measurement object. The machine life determination unit can determine the machine life based on the degree of deterioration detected by the deterioration detection unit. It is determined that the greater the degree of deterioration detected by the deterioration degree detection unit, that is, the longer the life of the measurement object, the shorter the machine life.

DESCRIPTION OF SYMBOLS 10 Mold apparatus 11 Fixed mold 12 Movable mold 100 Clamping apparatus 110 Fixed platen 120 Movable platen 130 Toggle support 140 Tie bar 150 Toggle mechanism 160 Clamping motor 170 Motion conversion mechanism 180 Mold thickness adjustment mechanism 700 Control apparatus (deformation measuring apparatus) )
711 Mold clamping data acquisition unit 712 Correction data acquisition unit 713 Mold clamping data correction unit 714 Output control unit 800 Displacement meter 801 Toggle support displacement meter 802 Movable platen displacement meter

Claims (6)

A mold clamping apparatus for separating and connecting a plurality of molds constituting the mold apparatus;
A displacement meter for measuring displacement in a predetermined direction orthogonal to the mold opening and closing direction of the surface of the member constituting the mold clamping device;
A deformation measuring device having a mold clamping data acquisition unit for acquiring a measurement value of the displacement meter in a mold clamping state,
The deformation measurement device acquires a change in a measurement value of the displacement meter when a relative position between the displacement meter and the member is changed in the mold opening / closing direction in a separated state where a plurality of the molds are separated from each other. An injection molding machine having a correction data acquisition unit.   2. The injection molding machine according to claim 1, wherein the deformation measuring device includes a mold clamping data correction unit that corrects data acquired by the mold clamping data acquisition unit using data acquired by the correction data acquisition unit. . The mold clamping device is:
With a fixed platen on which a fixed mold is mounted,
A movable platen to which a movable mold is attached;
A toggle mechanism for moving the movable platen in the mold opening and closing direction;
A toggle support for supporting the toggle mechanism;
A tie bar that connects the fixed platen or the movable platen and the toggle support with an interval in the mold opening and closing direction;
The injection molding machine according to claim 1, further comprising a mold thickness adjusting mechanism that adjusts the interval. As the displacement meter, including a toggle support displacement meter that measures the displacement of the surface of the toggle support in the predetermined direction,
The correction data acquisition unit acquires a change in a measurement value of the toggle support displacement meter when the position of the toggle support is changed in the mold opening / closing direction by operating the mold thickness adjusting mechanism in the separated state. The injection molding machine according to claim 3. As the displacement meter, including a movable platen displacement meter that measures the displacement of the movable platen in the predetermined direction,
The correction data acquisition unit is a measurement value of the movable platen displacement meter when the position of the movable platen is changed in the mold opening / closing direction by operating the toggle mechanism or the mold thickness adjusting mechanism in the separated state. The injection molding machine according to claim 3, wherein a change in the value is acquired. An injection molding method in which a plurality of molds constituting a mold apparatus are separated from each other by a mold clamping apparatus, and a molded material is manufactured by filling a molding material in the mold apparatus in a mold-clamped state,
Measuring the displacement of the member in a mold-clamped state using a displacement meter that measures displacement in a predetermined direction orthogonal to the mold opening and closing direction of the surface of the member constituting the mold clamping device;
Injecting the measurement value of the displacement meter when the relative position between the displacement meter and the member is changed in the mold opening / closing direction with a plurality of the molds being separated from each other Molding method.

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