JP2008229897A - Injection molding method and injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding method capable of manufacturing a molded product of high precision by precisely clamping a fixed mold and a movable mold. <P>SOLUTION: Since preparatory mold clamping operation and preparatory mold clamping release operation (steps S12 and S13) is performed before a final mold clamping for injection-molding a next molded product MP (step S15) is performed, the vibration of the fixed mold 61 or the movable mold 63 generated before mold clamping is reduced and, since it is prevented that the molds 61 and 63 are vibrated accompanied by the operation of an ejector 70 and another incidental device to produce fine axial shift at the time of final mold closing (step S14) or final mold clamping (step S15) for molding, mold register at the time of final mold closing (step S14) or final mold clamping (step S15) can be made highly precise and the quality precision of the molded product MP can be enhanced as a result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an injection molding method and an injection molding apparatus for molding an optical component or the like using a mold.

There is an injection molding apparatus that clamps a fixed mold and a movable mold between a fixed platen and a movable platen (for example, see Patent Document 1).
JP 2006-272558 A

  In the injection molding apparatus as described above, in order to take out the molded product remaining in one of the molds after the mold is opened, a take-out device having a hand for gripping the molded product is usually provided. Such a take-out device is generally fixed to the upper part of the fixed platen from the viewpoint of workability and stability.

  However, the present inventor has found that the operation of the take-out device as described above has an influence on the quality accuracy of the molded product based on examinations on experiments, trial production, and the like. That is, the take-out device has a drive unit, and the vibrations vibrate the fixed platen and the movable platen, and the vibrations continue for a while, so that a slight deviation occurs between the fixed mold and the movable mold. Therefore, it is considered that the quality accuracy of the molded product is lowered.

  Therefore, an object of the present invention is to provide an injection molding method and such an injection molding apparatus that can manufacture a highly accurate molded product by precisely clamping a fixed mold and a movable mold.

  In order to solve the above-described problem, the first injection molding method according to the present invention is a method in which a molded product formed by injection molding is taken out of a mold and then clamped for injection molding the next molded product. In addition, the mold clamping and the mold clamping release operation are performed at least once. Here, the mold clamping and the mold clamping release operation mean that the process of clamping the mold and the process of releasing the clamping of the mold are sequentially performed.

  In the above injection molding method, the mold clamping and the mold clamping release operation are performed at least once before performing the mold clamping for injection molding of the next molded product. In addition, the vibration of the mold can be reduced, and the shaft misalignment of the mold can be prevented during the actual mold clamping for injection molding. More specifically, when the mold for mold closing is closed, it is possible to prevent the mold from vibrating due to the operation of the take-out device and other accessory devices, and to prevent a slight axial shift, and a stable state after the mold clamping and mold clamping release operations. Thus, the actual mold clamping can be performed, so that the mold matching at the time of mold closing can be made highly accurate, and as a result, the quality accuracy of the molded product can be improved.

  The second injection molding method according to the present invention includes (a) a step of molding a first molded product by filling a resin into a cavity after clamping a mold, and (b) a first molded product. A step of opening the mold for removing from the mold, (c) a step of operating a take-out device for taking out the first molded product from the mold, and (d) a first molded product after the operation of the take-out device is stopped. Before molding the second molded product to be molded next, after performing the mold clamping and mold clamping release operation, and (e) performing the mold clamping and mold clamping release operation, And a step of molding the second molded product by filling the cavity with a resin.

  In the injection molding method, after the operation of the take-out device is stopped, before the second molded product to be molded next to the first molded product is molded, the mold clamping and mold clamping releasing operation steps are performed. Since it is provided, the vibration of the mold generated by the take-out device is reduced by the mold clamping and mold clamping release operation, and it is possible to prevent the mold from being displaced during the actual mold clamping for injection molding.

  A third injection molding method according to the present invention includes: (a) a step of molding a first molded product by filling a resin into a cavity after clamping a mold; and (b) a first molded product. A step of opening the mold to take it out of the mold, (c) a step of operating a take-out device for taking out the first molded product from the mold, and (d) to stop the vibration of the mold caused by the operation of the take-out device. In addition, after the step of performing mold clamping and mold clamping release operation and (e) the step of performing mold clamping and mold clamping release operation, the mold is clamped and the cavity is filled with resin. And a step of molding the molded product.

  In the above injection molding method, in order to stop the vibration of the mold caused by the operation of the take-out device, there is a step of performing mold clamping and mold-clamping releasing operation, so the mold vibration generated by the take-out device Is reduced by the mold clamping and mold clamping releasing operation, and the axial displacement of the mold can be prevented during the actual mold clamping for injection molding.

  According to a specific aspect of the present invention, in the molding method, the take-out device is fixed to an upper portion of a platen that supports the mold. In this case, the vibration from the take-out device is easily transmitted to the mold through the platen, but as described above, the mold vibration is reduced by the mold clamping and mold clamping release operation, thus preventing the axis deviation of the mold. it can.

  According to another aspect of the present invention, the mold clamping and the mold clamping release operation include a mold clamping state in which a clamping force is applied to the mold, and a mold clamping release state in which the clamping force on the mold is stopped. To do. In this case, the vibration of the mold and its peripheral part can be reduced in the mold-clamped state, and the accuracy of mold matching can be improved by re-clamping after the mold is loosened in the mold-clamped released state.

  According to still another aspect of the present invention, the mold opening amount in the process of performing the mold clamping and mold clamping releasing operation is smaller than the mold opening amount in the mold opening process. In this case, the mold clamping and mold clamping release operation can be performed in a short time, and a decrease in the processing speed of the injection molding process can be suppressed.

  The first injection molding apparatus according to the present invention performs mold opening for taking out a molded product formed by injection molding from a mold, and before performing mold clamping for injection molding of the next molded product. The mold clamping and mold clamping release operations are performed at least once. In this case, before performing the mold clamping for injection molding of the next molded product, the mold clamping and mold clamping release operation are performed at least once. Therefore, it is possible to prevent misalignment of the mold during the actual mold clamping for injection molding.

  A second injection molding apparatus according to the present invention has a fixed platen for mounting a fixed mold and a movable platen for mounting a movable mold, and the fixed mold and the movable mold are interposed between the fixed platen and the movable platen during molding. An injection molding apparatus that clamps a mold by clamping a mold, and after the mold is opened by operating the movable platen in order to take out the molded product from the mold, the next molded product is injection molded And a drive control device that operates the movable platen to perform mold clamping and mold clamping release operations at least once before the movable platen is operated to perform mold clamping.

  An injection molding method and apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view for explaining a molding machine system including the injection molding apparatus of the present embodiment, and FIG. 2 is a view taken along the line AA of the injection molding apparatus of FIG.

  The molding machine system includes an injection molding device 10 and a take-out device 70. Among these, the injection molding apparatus 10 includes a support frame 20, a fixed platen 31, a movable platen 33, a rear platen 35, a mold opening / closing / clamping apparatus 40, and an injection apparatus 50, and the fixed platen 31 is movable. Molding is enabled by clamping the fixed mold 61 and the movable mold 63 between the platen 33 and clamping the molds 61 and 63. Further, the take-out device 70 is an incidental device that performs operations related to molding in association with the injection molding device 10.

  In the injection molding apparatus 10, the support frame 20 is a pedestal for supporting each part of the injection molding apparatus 10, and a fixed platen 31 and a rear platen 35 are precisely placed on the upper portion thereof by a fixing device (not shown). It is positioned and supported and fixed with vibrations suppressed.

  The fixed platen 31 is fixed to the upper surface on the center side of the support frame 20 and supports the take-out device 70 on the upper portion thereof. An inner side 31 a of the fixed platen 31 detachably supports the fixed mold 61 and faces the inner side 33 a of the movable platen 33.

  The movable platen 33 is supported by a slide guide 41 described later so as to be reciprocally movable in the ± X directions. The inner side 33 a of the movable platen 33 supports the movable mold 63 so as to be detachable, and faces the inner side 31 a of the fixed platen 31. An ejector drive device 91 is attached to the back surface of the movable platen 33. The ejector driving device 91 drives an ejector pin incorporated in the movable mold 63 to project the molded product MP remaining in the movable mold 63.

  The rear platen 35 is fixed to the upper surface of the support frame 20 on the end side. However, the position of the rear platen 35 can be adjusted in the ± X directions, and the distance between the fixed platen 31 and the movable platen 33 can be adjusted. The rear platen 35 supports the movable platen 33 from behind via a toggle mechanism 45 of the mold opening / closing and clamping apparatus 40 during mold clamping. The rear platen 35 and the stationary platen 31 are fixed to each other via tie bars 43a and 43b so that they can withstand the pressure of mold clamping (ie, lock-up) during molding.

  The mold opening / closing and mold clamping device 40 includes a slide guide 41, tie bars 43 a and 43 b, a toggle mechanism 45, and an actuator 47. Among these, the slide guide 41 functions as a guide device that slidably supports the movable platen 33. The toggle mechanism 45 and the actuator 47 function as a driving device for moving the movable platen 33 forward and backward.

  In the mold opening / closing / clamping apparatus 40, the slide guide 41 is provided on the support frame 20 and directly below the movable platen 33, supports the movable platen 33, and is smooth in the ± X direction of the movable platen 33. Reciprocal movement is possible.

  The upper tie bar 43a and the lower tie bar 43b are installed between the fixed platen 31 and the rear platen 35, respectively. There are actually two upper tie bars 43a and two lower tie bars 43b, which are supported by the four corners of the fixed platen 31 and the rear platen 35 and extend in the X direction in parallel with each other. At the four corners of the movable platen 33, through holes for passing tie bars 43a and 43b are formed.

  The toggle mechanism 45 includes first and second toggle portions 45a and 45b each formed of a member such as a toggle link 45d, and is spanned between the movable platen 33 and the rear platen 35. The first and second toggle portions 45 a and 45 b expand and contract in response to the driving force from the actuator 47. That is, the movable platen 33 can be freely moved close to or away from the rear platen 35, and as a result, the movable platen 33 can be pressed toward the fixed platen 31 with a desired pressure. As a result, the movable platen 33 and the fixed platen 31 can be clamped close to each other at the mold clamping position of the movable platen 33, and the fixed mold 61 and the movable mold 63 sandwiched between them are closed. be able to. Alternatively, the movable platen 33 and the fixed platen 31 can be separated from each other to move the movable platen 33 to the retracted position, and the fixed mold 61 and the movable mold 63 sandwiched between them can be opened. . Furthermore, when the mold is closed, the movable platen 33 can be pressed against the fixed platen 31 by driving the actuator 47 with a very large pressure, and the fixed mold 61 and the movable mold 63 can be clamped with sufficient force. it can. The actuator 47 is composed of a mechanical mechanism type driving device including a motor, a ball screw, or the like, or a fluid utilization type driving device including a hydraulic cylinder or the like, and has a desired timing according to a control signal from a control unit (not shown). Works with. In the above description, the mold opening / closing and clamping device 40 is provided with the toggle mechanism 45 to perform the mold opening / closing, but the toggle mechanism 45 may be omitted and the movable platen 33 may be directly operated by the actuator 47.

  The injection device 50 includes a heating cylinder portion 51 including a cylinder, a screw, a heater, a hopper 52 that supplies resin to the heating cylinder portion 51, an advancing / retreating operation of the heating cylinder portion 51, and rotation to a screw in the heating cylinder portion 51. And a drive unit 53 for performing the above operation, and the molding molten resin can be discharged from the injection end 55. The injection device 50 can detachably connect the injection end 55 to the fixed platen 31, and the fixed mold 61 and the movable mold 63 are clamped via the fixed platen 31. The molten resin formed in the heating cylinder portion 51 can be supplied to the cavity formed at an appropriate pressure at a desired timing.

  The take-out device 70 includes a base 71, a Y moving unit 73, an X moving unit 74, and a hand 75. Among these, the Y moving unit 73, the X moving unit 74, the hand 75, and the like constitute a movable unit of the take-out device 70.

  In the take-out device 70, the base 71 has a fixing portion 71a and a guide rail 71b, and serves as a portion for fixing and supporting the take-out device 70 on the fixed platen 31. Specifically, the fixed portion 71a is fixed to the upper surface 31c of the fixed platen 31, and the guide rail 71b is supported on the fixed portion 71a so as to extend in the Y direction, that is, in the horizontal direction.

  The Y moving portion 73 is supported by the guide rail 71b of the base portion 71, can slide smoothly in the ± Y direction along the guide rail 71b, and supports the guide rail 73b extending in the X direction.

  The X moving unit 74 is supported by a guide rail 73b extending from the Y moving unit 73, and can move forward and backward in the ± X directions. As a result, the X moving unit 74 can move two-dimensionally to an arbitrary position in the XY plane. ing. The X moving unit 74 can move the support rod 75 a extending from the hand 75 up and down.

  The hand 75 is supported by the lower end of the support rod 75a of the X moving part 74, and can move to an arbitrary position three-dimensionally. The hand 75 can grip the molded product MP between a pair of chuck members 75b and 75b that open and close at a necessary timing. Note that when the molded product MP is an optical element, a sprue portion, which is an unnecessary portion formed accompanying the molding, is gripped by the hand 75 so as not to damage the optical surface.

  FIG. 3 is a block diagram illustrating a control system of the molding machine system shown in FIG. The control system includes a mold opening / closing / clamping device driving unit 81, an ejecting device driving unit 83, an injection device driving unit 85, an ejector driving device driving unit 87, and a control unit 89. Here, the mold opening / closing / clamping device driving unit 81, the injection device driving unit 85, the ejector driving device driving unit 87, and the control unit 89 are incorporated in the injection molding device 10 which is a main body portion, and the take-out device is driven. The part 83 is built in the take-out device 70.

  The mold opening / closing / mold clamping device drive unit 81 operates the toggle mechanism 45 via the actuator 47. At this time, the mold opening / closing / mold clamping device driving unit 81 operates the toggle mechanism 45 while monitoring detection outputs of a position sensor, a pressure sensor and the like attached to the mold opening / closing / mold clamping device 40. The take-out device driving unit 83 operates the take-out device 70 to move the hand 75 three-dimensionally and causes the hand 75 to hold the molded product MP. At this time, the take-out device driving unit 83 operates the take-out device 70 while monitoring the detection output of a position sensor or the like attached to the take-out device 70. The injection device driving unit 85 controls the operation of the injection device 50 and adjusts the supply timing and supply pressure of the resin to the fixed platen 31. The ejector drive device drive unit 87 controls the operation of the ejector drive device 91 to adjust the timing of ejecting the molded product MP remaining on the movable mold 63 side from the movable mold 63.

  The control unit 89 is a drive control device for controlling the injection operation and the molding operation by the molding machine system, and includes a mold opening / closing / clamping device drive unit 81, a take-out device drive unit 83, an injection device drive unit 85, and an ejector. The operation of the drive device drive unit 87 is comprehensively controlled. That is, the control unit 89 operates the mold opening / closing / mold clamping device 40 via the mold opening / closing / mold clamping device driving unit 81 to perform mold closing and clamping using the movable platen 33 and the fixed platen 31. In addition, the molten resin is supplied between the molds 61 and 63 at a necessary timing by operating the injection device 50 via the injection device driving unit 85. Then, after the molding is completed, the control unit 89 operates the mold opening / closing / clamping device 40 via the mold opening / closing / clamping device driving unit 81 to open the molds 61 and 63, and By operating the take-out device 70 via the take-out device drive unit 83, the molded product MP is taken out from between both the platens 31 and 33 and is conveyed to the external gate cutting device GC.

  FIG. 4 is a flowchart conceptually illustrating the operation of the molding machine system shown in FIG. 4A mainly explains the operation of the injection molding apparatus 10, and FIG. 4B mainly explains the operation of the take-out apparatus 70.

  First, the control unit 89 operates the mold opening / closing / mold clamping device 40 via the mold opening / closing / mold clamping device driving unit 81 to start the preliminary mold closing for moving the movable platen 33 to the + X side (step S11). Thereafter, the control unit 89 maintains the operation of the mold opening / closing / clamping apparatus 40 and moves the movable platen 33 to the fixed platen 31 side to the mold contact position where the fixed mold 61 and the movable mold 63 come into contact with each other. .

  Thereafter, the control unit 89 further operates the mold opening / closing / clamping device driving unit 81 to perform preliminary mold clamping for clamping the fixed mold 61 and the movable mold 63 with a necessary pressure (step S12). By completing the transition to the preliminary mold clamping state, the preliminary mold closing process by the movable platen 33 and the fixed platen 31 is completed.

  At the start of preliminary mold closing in step S <b> 11, the control unit 89 restricts the operation of the take-out device 70 via the take-out device drive unit 83. That is, the control unit 89 stops the operation of the take-out device 70 at the time of starting the mold closing in step S11 or before that, and puts the Y moving unit 73 and the hand 75 in a stationary state. Thereby, it is possible to prevent the take-out device 70 from becoming a vibration source and the stationary platen 31 and the movable platen 33, and further the stationary mold 61 and the movable mold 63 from continuing to resonate and vibrate. Further, the vibration of the fixed platen 31 and the movable platen 33 is attenuated by the preliminary mold clamping performed in step S12. That is, the stationary platen 31, the movable platen 33, and other peripheral components vibrate in their own vibration mode using the take-out device 70 as a vibration source, and if left unattended, the vibration state is maintained even if the drive of the take-out device 70 stops. Although continued for a while, the fixed platen 31 and the movable platen 33 are preliminarily clamped to form a closed system. Therefore, the vibrations of both the platens 31 and 33 and the fixed mold 61 and the movable mold 63 supported by the platens 31 and 33 are obtained. Can be attenuated.

  Next, the control unit 89 operates the mold opening / closing / mold clamping device 40 via the mold opening / closing / mold clamping device driving unit 81 to perform preliminary mold clamping release and mold opening to move the movable platen 33 to the −X side. (Step S13). In this preliminary mold clamping release and mold opening process, the movable platen 33 is moved backward until the fixed mold 61 and the movable mold 63 are slightly separated from each other and do not come into contact with each other. For this purpose, the movable platen may be retracted to such an extent that the two molds can be displaced relative to each other so that even if a shaft misalignment occurs during the preliminary mold clamping, it can be corrected. Therefore, the mold opening amount of the movable mold 63 immediately after the preliminary mold clamping is smaller than the mold opening amount of the movable mold 63 after the main mold clamping described later. In this case, the vibration of the fixed platen 31 and the vibration of the movable platen 33 are sufficiently small, and the operation of the take-out device 70 is stopped and is no longer a vibration source. Is maintained in a stable state with reduced vibration. Note that the mold opening amount by which the movable platen 33 is retracted immediately after the preliminary mold clamping is not limited to the above-described mode, and can be various mold opening amounts. For example, the mold opening amount may be the same as that after normal permanent mold clamping. In this case, the mold opening / closing and clamping apparatus 40 may be controlled by simply performing the conventional control a plurality of times. However, in order to suppress an increase in the processing speed of the injection molding process, that is, the molding cycle time, as described in the above embodiment, the movable platen 33 is moved away from the mold so that the molds can be displaced from each other. It is preferable to do.

  The series of steps S12 and S13 described above is a mold clamping and mold clamping release operation that sequentially performs preliminary mold clamping and preliminary mold clamping release. Here, the preliminary mold clamping corresponds to the start of a mold clamping state in which a clamping force is applied to the fixed mold 61 and the movable mold 63, and the preliminary mold clamping release refers to the clamping force on the fixed mold 61 and the movable mold 63. This corresponds to the start of the preliminary mold clamping release state to stop. By such mold clamping and mold clamping release operations, the vibrations of the fixed platen 31 and the movable platen 33, and thus the fixed mold 61 and the movable mold 63 can be attenuated to be shifted to a stable state and held.

  Next, the control unit 89 operates the mold opening / closing / mold clamping device 40 via the mold opening / closing / mold clamping device driving unit 81 to start the main mold closing to move the movable platen 33 to the + X side (step S14). . Thereafter, the control unit 89 maintains the operation of the mold opening / closing / clamping apparatus 40 and moves the movable platen 33 to the fixed platen 31 side to the mold contact position where the fixed mold 61 and the movable mold 63 come into contact with each other. .

  Thereafter, the control unit 89 further operates the mold opening / closing / clamping device driving unit 81 to perform final mold clamping that clamps the fixed mold 61 and the movable mold 63 with a necessary pressure (step S15). With this main mold clamping state, the main mold closing process by the movable platen 33 and the fixed platen 31 is completed.

  Upon completion of the transition to the main mold clamping state in step S12, that is, completion of the main mold closing process, the control unit 89 permits the operation of the take-out device 70 via the take-out device driving unit 83. That is, when the control unit 89 operates the take-out device 70 via the take-out device drive unit 83 and the hand 75 holds the molded product MP formed in the previous process, the control unit 89 keeps the hand 75 holding the molded product MP. , + Y side is moved sideways to continue product carry-out (step S22). Accordingly, the molded product MP held by the hand 75 can be moved to the gate cutting device GC and arranged there.

  After the completion of the main clamping process, the control unit 89 operates the injection apparatus 50 via the injection apparatus driving unit 85, and is necessary in the cavity between the fixed mold 61 and the movable mold 63 that are clamped. Resin is injected with a sufficient pressure (step S16). Then, the control unit 89 gradually cools the resin in the cavity and waits for the completion of molding (step S17).

  In parallel with this, the control unit 89 continues the operation of the take-out device 70 via the take-out device drive unit 83, completes the carry-out of the product that transfers the previous molded product MP to the gate cutting device GC, and the molded product. The MP 75 is transported to raise the empty hand 75 to the height of the guide rail 71 b and move it to the −Y side to return the Y moving portion 73, that is, the hand 75 to the basic position above the center of the fixed platen 31. (Step S22). That is, preparation for taking out the molded product MP molded in this process is performed.

  Next, the control unit 89 confirms the completion of molding and conveyance, operates the mold opening / closing / mold clamping device 40 via the mold opening / closing / mold clamping device driving unit 81, and moves the movable platen 33 to the -X side. The mold opening to be performed is performed (step S18). At this time, the movable mold 63 is farthest from the fixed mold 61, and the molded product MP remains on the movable mold 63 side, not on the fixed mold 61 side. Further, the control unit 89 operates the ejector driving device 91 via the ejector driving device driving unit 87 to appropriately eject the molded product MP remaining on the movable mold 63 side from the movable mold 63.

  Next, the control unit 89 allows the product take-out operation of the take-out device 70 and waits for its completion (step S19). On the other hand, the control unit 89 operates the take-out device 70 via the take-out device drive unit 83 to cause the hand 75 to grip the next molded product MP remaining on the movable mold 63 side (step S23). More specifically, the hand 75 moves in the −Z direction and grips an appropriate position such as a sprue portion or a runner portion of the molded product MP remaining in the movable mold 63, and + Z while holding the molded product MP. Move in the direction to complete the return to the basic position. At this time, the control unit 89 restricts the operation of the mold opening / closing / mold clamping device 40 via the mold opening / closing / mold clamping device driving unit 81. That is, the control unit 89 stops the operation of the mold opening / closing / mold clamping device 40 and maintains the movable platen 33 in the mold open state until the product gripping in step S25 is completed.

  Thereafter, the process returns to step S11 and the like, and the same processing as described above is performed. In other words, the take-out device 70 is held at the basic position, and the preliminary mold closing and preliminary clamping are performed, and the main mold closing is performed in a stable state after the vibration is attenuated.

  As is apparent from the above description, according to the injection molding apparatus 10 of the present embodiment, the preliminary mold clamping and the preliminary mold are performed before performing the main mold clamping (step S15) for injection molding the next molded product MP. Since the clamping release operation (steps S12 and S13) is performed, the vibrations of the fixed mold 61 and the movable mold 63 generated before the mold clamping are reduced, and the molding main mold closing (step S14) and the main mold clamping ( At the time of step S15), it is possible to prevent the molds 61 and 63 from vibrating with the operation of the take-out device 70 and other auxiliary devices and causing a minute axis shift. Therefore, it is possible to increase the accuracy of mold alignment when closing the main mold (step S14) and closing the main mold (step S15), and as a result, it is possible to improve the quality accuracy of the molded product MP.

  Although the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications are possible. For example, the preliminary mold clamping and the preliminary mold clamping release operation (steps S12 and S13) can be repeated not only once but a plurality of times.

  In the embodiment, the vibration source is the take-out device 70. However, the gate cutting device GC and the dryer that supplies the molding material to the hopper 52 may also be the vibration source. The operations of the gate cutting device GC and the dryer can be stopped in the mold clamping release operation (steps S12 and S13) and the subsequent mold closing (step S14) and the mold clamping (step S15).

  Moreover, in the said embodiment, although the injection molding apparatus 10 illustrated the horizontal type thing, even if it is a vertical type or a vertical type injection molding apparatus, the same preliminary mold clamping and preliminary mold clamping cancellation | release operation | movement (step S12, By performing step 13), it is possible to reduce vibration and improve mold matching accuracy.

It is a front view explaining the injection molding apparatus etc. of 1st Embodiment. It is an AA arrow line view of the injection molding apparatus of FIG. It is a block diagram explaining the control system of the injection molding apparatus shown in FIG.1 and FIG.2. (A), (B) is a flowchart explaining operation | movement of a molding machine system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Injection molding apparatus, 31 ... Fixed platen, 33 ... Movable platen, 35 ... Rear platen, 40 ... Mold opening / closing and clamping device, 41 ... Slide guide, 43a, 43b ... Tie bar, 45 ... Toggle mechanism, 47 ... Actuator, DESCRIPTION OF SYMBOLS 50 ... Injection apparatus, 51 ... Heating cylinder part, 52 ... Hopper, 55 ... Injection end, 61 ... Fixed mold, 63 ... Movable mold, 70 ... Taking-out apparatus, 75 ... Hand, 81 ... Mold opening / closing and clamping device drive , 83 ... Take-out device drive unit, 85 ... Injection device drive unit, 87 ... Ejector drive device drive unit, 89 ... Control unit, 91 ... Ejector drive device, GC ... Gate cutting device, MP ... Molded product

Claims (8)

  After the molded product formed by injection molding is taken out from the mold, the mold clamping and the mold clamping release operation are performed at least once before performing the mold clamping for injection molding of the next molded product. Molding method. Forming a first molded product by filling the cavity with resin after clamping the mold;
Opening the mold to remove the first molded product from the mold;
Operating a take-out device for removing the first molded product from the mold;
A step of performing mold clamping and mold clamping releasing operations of the mold before molding a second molded product molded next to the first molded product after the operation of the take-out device is stopped;
After the step of performing the mold clamping and mold clamping release operation, clamping the mold and molding the second molded product by filling the cavity with resin;
An injection molding method comprising: Forming a first molded product by filling the cavity with resin after clamping the mold;
Opening the mold to remove the first molded product from the mold;
Operating a take-out device for removing the first molded product from the mold;
Performing a mold clamping and mold clamping release operation of the mold in order to stop the vibration of the mold caused by the operation of the take-out device;
After the step of performing the mold clamping and mold clamping release operation, clamping the mold and molding the second molded product by filling the cavity with resin;
An injection molding method comprising:   The injection molding method according to any one of claims 2 and 3, wherein the take-out device is fixed to an upper part of a platen that supports the mold.   The mold clamping and mold clamping release operations include a mold clamping state in which a clamping force is applied to the mold and a mold clamping release state in which the clamping force on the mold is stopped. The injection molding method according to any one of 4 to 4.   6. The mold opening amount in the step of performing the mold clamping and mold clamping release operation is made smaller than the mold opening amount in the mold opening step. 6. Injection molding method.   After performing mold opening to take out the molded product formed by injection molding from the mold, perform mold clamping and mold clamping release operation at least once before performing mold clamping for injection molding of the next molded product. An injection molding apparatus characterized by that. A fixed platen for attaching a fixed mold and a movable platen for attaching a movable mold, and clamping the mold by sandwiching the fixed mold and the movable mold between the fixed platen and the movable platen during molding An injection molding apparatus for performing
After the mold is opened by operating the movable platen to take out the molded product from the mold, before the mold is clamped by operating the movable platen to injection mold the next molded product, An injection molding apparatus comprising: a drive control device that operates a movable platen to perform mold clamping and mold clamping release operations at least once.

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