JP3225897U - Mold for injection molding of resin molded products - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding die capable of obtaining a resin molded product having an accurate shape and a good appearance quality, in which the timing of holding / fixing an outer slide core or the start of sliding is stable and stable. SOLUTION: An injection molding die includes a movable side mold plate 20, left and right slide cores 30 held on a plate surface of the movable side mold plate and sliding in a direction orthogonal to a mold opening direction, and slides thereof. A mold for injection molding of a resin molded product, comprising a core and a fixed-side mold plate 10 facing each other with a parting line PL interposed therebetween, and the fixed-side mold plate includes an angular pin 13 for sliding a slide core, and the angular pin 13. The slide core includes a slide retainer 15 that prohibits or guides the slide and slides. The slide core has a long pin hole 32 into which the angular pin is inserted, a roller 35 that contacts the slide retainer, and the roller as a slide retainer. And a pressing spring 34. [Selection diagram] Figure 2

Description

  The present invention relates to an injection molding die for a resin molded product having an undercut, and more particularly to an injection molding die capable of adjusting the operation timing of a slide core for molding the undercut.

  A parent-child slide core or the like having a plurality of undercuts is provided with means for adjusting the operation timing of the slide core for forming each undercut. As a means for adjusting the timing of the slide core, there are used one that uses a driving means such as a hydraulic or pneumatic cylinder, or a mechanical means that uses an angular pin and its pin hole. Molds using this mechanical means have the advantage of being compact and economical.

  For example, Patent Document 1 proposes an injection molding die in which another undercut hole or the like can be provided on the undercut surface. That is, in an injection molding die in which a slide core attached to a movable mold plate is operated by an angular pin protruding from a fixed mold plate, another slide core is built into the slide core, and each slide core is connected by an angular pin. Injection molds have been proposed which can be activated. This injection molding die incorporates another middle slide core inside the outer slide core, and these movements are timed to the movement of the two slide cores by the gear tap between the angular pin and the angular hole of the outer slide core. It is said that it has a feature.

  Patent Document 2 discloses a molding die for molding a molded product having a first undercut portion in the first die cutting direction and a second undercut portion in the second die cutting direction intersecting with the first die cutting direction. A die, a first slide core that is movable in the second die-cutting direction and forms the second undercut portion; and a first slide core that engages with the first slide core. A second slide core that is driven after the movement of the first slide core and the second slide core are engaged, and are driven in the first die cutting direction by the movement of the second slide core, and the first undercut A molding die including a third slide core forming a part has been proposed. In this molding die, the first slide core 2 is driven by an inclined pin 11 held by the upper die 1 and engages with a guide surface 12 of the upper die 1 formed at an angle larger than the inclined pin 11. It is said that

JP-A-62-240522 Japanese Patent Laid-Open No. 4-158006

  The operation of the outer slide core in the injection molding die described in Patent Document 1 or 2 is performed by sliding the angular pin and the angular hole (tilt pin and guide hole), and the locking block or the upper mold (fixing the sliding core and the fixed mold plate). It is performed by sliding with a template. That is, in the operation of the outer slide 4 in the injection molding die described in Patent Document 1, when the angular pin 3 engages with the inner wall portion of the angular hole 6 and slides, the outer slide 4 causes the fixed mold plate 13 to move. It is performed by sliding along the guide surface of the locking block 12. Further, the operation of the first slide core 2 in the molding die described in Patent Document 2 is that the inclined pin 11 held by the upper die 1 engages with the inner wall portion of the guide hole 22 and slides, It is performed by sliding the first slide core 2 along the guide surface 12 of the upper mold 1.

  The operation of the outer slide core depends on the contact / sliding between the angular pin and the inner wall of the angular hole, and the contact / sliding between the outer slide core and the fixed mold plate, and the timing of the contact / sliding is adjusted. There is no function. Further, in the injection molding die described in Patent Document 1, the holding / fixing of the outer slide core or the start of sliding is performed by a movable side mold plate that engages or disengages with a positioning hole provided in the slide surface of the outer slide core The operation is not stable because of the operation of the positioning pin which is urged by the spring force to project from the positioning pin. Further, there is a problem in that the positioning pin easily comes off and the slide core slides carelessly. For this reason, there is a demand for an injection molding mold that can reliably and stably start / fix the outer slide core or start the slide, and obtain a resin molded product having an accurate shape and good appearance quality. There is.

  In view of the above conventional problems and demands, the present invention provides a resin molded product having a reliable and stable start timing of holding / fixing or sliding of the outer slide core, and an accurate shape and good appearance quality. It is an object of the present invention to provide an injection molding die that can be manufactured.

  The mold for injection molding according to the present invention comprises a movable side mold plate, left and right slide cores held on the plate surface of the movable side mold plate and sliding in a direction orthogonal to the mold opening direction, and those slide cores. A mold for injection molding of a resin molded product having a fixed-side mold plate facing each other across the parting line PL, wherein the fixed-side mold plate is an angular pin that slides the slide core, and prohibits the sliding. Or a slide presser for guiding and sliding, wherein the slide core has a long pin hole for inserting the angular pin, a roller that abuts against the slide presser, and presses the roller against the slide presser. And a spring.

  In the above invention, it is preferable that the guide surface portion with which the roller of the slide retainer abuts is composed of a linear portion parallel to the mold opening direction and an inclined portion that gradually guides the slide core outward.

  Further, it is preferable that the slide presser or the roller be adjustable in vertical position with respect to the parting line PL.

  INDUSTRIAL APPLICABILITY The injection molding die according to the present invention has a stable and stable start timing of holding / fixing or sliding of the outer slide core, and can mold a resin molded product having an accurate shape and good appearance quality. . INDUSTRIAL APPLICABILITY The present invention can also be applied to an injection molding die having a plurality of undercuts that require adjustment of the operation timing of the slide core.

It is explanatory drawing which shows the state of the injection mold which concerns on this invention when resin injection is completed after mold clamping. It is a partially expanded view of the injection-molding die shown in FIG. In the injection-molding die shown in FIG. 1, an explanatory view showing a state in which the angular pin comes into contact with the inner peripheral surface of the pin hole of the slide after the part of the shampoo brush of the fixed-side mold plate relating to the molding is released from the mold. Is. It is explanatory drawing which shows the state when the operation | movement of the slide of the injection molding die shown in FIG. 1 is completed. It is explanatory drawing which shows a state when resin molding is completed by the injection molding die shown in FIG. 1 and the molded resin molded product is released from the mold with the ejector sleeve pin.

  Hereinafter, a mode for carrying out the invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a state when resin injection is completed when a resin molded product is molded using the injection molding die according to the present invention. FIG. 2 is a partially enlarged view of the injection molding die. As shown in FIG. 1 or FIG. 2, the present injection molding die includes a movable side mold plate 20 and a right slide that is held on the plate surface of the movable side mold plate 20 and slides in a direction orthogonal to the mold opening direction. A core 301, a left slide core 302, and a fixed-side template 10 that faces the slide cores 30 (slide cores 301 and 302) with a parting line PL interposed therebetween. The slide cores 301 and 302 are so-called outer slide molds, and are located outside the injection molding mold and outward with respect to the center line C of the mold (direction orthogonal to the mold opening direction). It is a mold that slides into. A resin molded product 50 molded by this injection molding die is a shampoo brush, and has a shape in which pins 53 are erected on the dish portion of the main body 51 of the offering table.

  The fixed-side mold plate 10 has an angular pin 13 that slides the slide core 30, and a slide retainer 15 that prohibits the slide core 30 from sliding or guides the slide core 30 to slide. The fixed-side template 10 constitutes a cavity that forms the upper surface of the dish including the pin 53 of the resin molded product 50 (shampoo brush). The cavity forming the pin 53 is parallel to the mold center line C (mold opening direction).

  The angular pin 13 is held by the fixed-side template 10 with a predetermined inclination angle and is inserted into the pin hole 32 of the slide core 30. The slide retainer 15 is held on the side surface of the fixed-side mold plate 10, has a straight line portion parallel to the mold opening direction and an inclined portion following the straight line portion, and forms a guide surface portion of the roller 35 described below. . The slide retainer 15 of this example is screwed to the fixed-side template 10 and its bolt hole is a ridiculous hole. Thereby, the slide presser 15 can adjust the height position from the parting line PL. The height position of the roller 35 may be adjustable.

  The slide core 30 has a roller 35 on its side end portion, which is in contact with the slide retainer 15. The roller 35 is constantly pressed against the slide retainer 15 by the spring 34. The spring 34 is held in the spring chamber 30a by being held by the core shaft 33 that penetrates through the center of the spring 34. In FIG. 1 or 2, the roller 35 is guided by the linear portion of the slide retainer 15, and the slide core 30 is securely held by the left and right slide retainers 15 and its slide is prohibited. Therefore, the slide core 30 does not slide carelessly. The spring 34 is required to have spring elasticity so that the slide core 30 is held at a predetermined position and the slide core 30 performs a predetermined operation.

  The pin hole 32 of the slide core 30 is an elongated hole, and has the angular pin 13 and the gap portion 32a. The gap portion 32a can provide a time difference in which the slide core 30 operates after the mold is opened. In this injection molding die, the operation timing of the slide core 30 can be controlled stably and accurately. Therefore, the gab portion 32a of the pin hole 32 can be made large, and the time difference between the slide core 30 and the slide start can be made large.

  The movable mold plate 20 has a plate surface on the upper surface thereof as a slide surface of the slide core 30, and has a base portion 20a at the center of the plate surface. A core shaft 33 is screwed to the base portion 20a and extends on the plate surface. Further, the movable side mold plate 20 has an ejector sleeve pin 25 penetrating the movable side mold plate 20 along the mold center line C, and a core pin 26 penetrating the inside thereof and contacting the fixed side mold plate 10. are doing.

  After the resin is injected into the main mold for injection molding as shown in FIG. 1 or 2, the mold is opened as shown in FIGS. 3 to 5, and the molded resin molded product 50 is released. First, as shown in FIG. 3, the mold portion for molding the pin 53 of the resin molded product 50 (shampoo brush) of the stationary mold plate 10 is completely released from the pin 53. At this time, the roller 35 is at the intersection of the straight portion and the inclined portion of the slide retainer 15. That is, the pin 53 is released from the mold while the main body 51 of the resin molded product 50 is securely held by the slide core 30. This can prevent the quality of the pin 53 from being damaged.

  As the mold opening progresses further, as shown in FIG. 4, the angular pin 13 slides on the inner peripheral surface of the pin hole 14, so that the roller 35 is guided by the inclined portion of the slide retainer 15 and gradually rolls outward. The slide core 30 gradually slides outward. Then, the resin molded body 50 is held by the core pin 26. As shown in FIG. 5, the resin molded body 50 can be completely released by operating the ejector rod 28. That is, by pressing the end portion of the resin molded product 50 with the ejector sleeve pin 25 via the protruding plate 27, the resin molded product 50 is released from the core pin 26 and completely released.

  The present invention has been described above. The injection molding die according to the present invention is characterized in that the slide core is pressed and held by the guide surface portion having the linear portion and the inclined portion of the slide retainer via the roller. Therefore, the fixing and operation of the sudide core can be stably and accurately controlled, and the time difference between the mold opening and the operation start of the slide core can be made large. The present invention can be applied not only to such an injection molding die but also to an injection molding die having a parent-child sudide for processing a plurality of undercuts.

10 Fixed side template
13 Angular Pin
14 pin hole
15 Slide foot
20 Movable template
25 ejector sleeve pin
26 core pins
27 Projection plate
28 Ejector rod
30 slide core
301 Right slide core
302 Left slide core
32 pin hole
33 core shaft
34 spring
35 Laura
50 Resin molded product (shampoo brush)
51 body
53 pin

Claims (3)

Movable side template, left and right slide cores held on the plate surface of the movable side template and sliding in a direction orthogonal to the mold opening direction, and fixed sides facing the slide cores with the parting line PL interposed therebetween. A mold for injection molding of a resin molded product having a template,
The fixed-side template has an angular pin that slides the slide core, and a slide retainer that inhibits or guides the slide, and slides.
The slide core is an injection molding die including a long pin hole through which the angular pin is inserted, a roller that abuts on the slide retainer, and a spring that presses the roller against the slide retainer.   The injection molding die according to claim 1, wherein the guide surface portion with which the roller of the slide retainer abuts includes a linear portion parallel to the mold opening direction and an inclined portion that gradually guides the slide core outward. .   The mold for injection molding according to claim 1 or 2, wherein the slide retainer or the roller is vertically adjustable with respect to the parting line PL.

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