JP2006142523A - Molded product release device of mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded product release device capable of being simply constituted so as to be reduced in volume. <P>SOLUTION: The molded product release device in a mold of a molded product 17 composed of a fixed mold 1 and a movable mold 4 is constituted of the ejection pin 12, which is energized in the ejection direction of the molded product 17 by an elastic member 13 and provided to one of the fixed mold 1 and the movable mold 4 so that an end surface 16 thereof comes into contact with the molded product 17, and the return pin 11 fixed to the other one of the fixed mold 1 and the movable mold 4 to press the end surface 16 of the ejection pin 12 so that the end surface 16 becomes a position where a part of the predetermined shape of the molded product 17 is formed at the time of mold register to push and return the ejection pin 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molded product release apparatus for a molding die.

  A conventional molded product release device for ejecting a molded product by a resilient member is disclosed in Patent Document 1. Patent Document 1 states that “a step portion is provided on the recess edge of the mounting plate, and the step portion engages with a step portion provided on the outer periphery of the mold. The bottom portion of the recess is formed by the bottom surface of the mold. A space is formed in which a projecting plate is provided, and the projecting plate is elastically biased by a leaf spring in the direction of the molded product. The protruding pin is positioned such that its tip abuts against the edge, and the return pin is in contact with a mating die that is paired with the die provided with the protruding pin. The tip of the return pin is brought into contact with the portion, the protruding plate is returned against the elastic urging force of the leaf spring, and the protruding pin is pushed back to the surface of the cavity ”.

  However, in the conventional molded product release apparatus according to Patent Document 1, the return pin protrudes and must be provided outside the pin and the cavity, and the mold becomes large, and the return pin and the protrusion pin are connected in the space at the bottom of the mold. Since a protruding plate is required, the dimension of the mold in the thickness direction is increased.

JP 2004-306461 A (paragraph 0028, FIG. 10)

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a molded product release device that can be configured simply and with a small volume.

  The present invention is a molded product release apparatus for a molded product of a molded product comprising a fixed mold and a movable mold, and is biased in a direction in which the molded product is projected by a resilient member so that the end surface comes into contact with the molded product. A position where an end pin provided on one of the fixed mold and the movable mold is fixed to the other of the fixed mold and the movable mold, and the end surface of the protrusion pin forms a part of a predetermined shape of the molded product The present invention relates to a molded product release device including a return pin that presses the end face to push back the protruding pin.

  According to the present invention, the molded product release device can be configured simply and with a small volume.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of an essential part of a mold provided with a molded product release device of the present invention. FIG. 2 is an enlarged cross-sectional view showing a state where a molded product is molded with a mold equipped with the molded product release device of the present invention. FIG. 3 is an enlarged cross-sectional view showing a state where a molded product molded with a mold provided with the molded product release device of the present invention is being released.

  The molding die composed of the fixed die 1 and the movable die 4 is attached to a molding machine (not shown) so as to be separated from each other, close to each other, and press-cable. The fixed mold 1 includes a fixed mold plate 2 and a release plate 3 that is spaced apart and close to the fixed mold plate 2, and has a sprue portion 6 that is perforated through the fixed mold plate 2 and the release plate 3. ing. The movable mold 4 includes a movable mold plate 5 and a mounting plate 15. When the fixed mold 1 and the movable mold 4 are matched with each other, a cavity portion 8 is formed on the opposing surface of the fixed mold plate 2 and the movable mold plate 5. The cavity portion 8 is a portion for filling the molten resin and molding the molded product 17. When the molded product 17 is a separator for a fuel cell illustrated as an example, the cavity portion 8 includes a gate 7 communicating with the sprue portion 6 in a small area and an outer peripheral portion 10 defined by an annular boundary convex portion 9. Prepare. Although the gate 7 is illustrated as a so-called pin gate provided at the substantially central portion of the cavity portion 8, it may be another gate such as a direct gate, a side gate, or a fin gate.

  The fixed mold plate 2 forming the outer peripheral portion 10 provided on the outer periphery of the cavity portion 8 is provided with a protruding pin 12 so that the end surface 16 can form the surface shape of the molded product 17 so as to protrude and retract. The protruding pin 12 includes a small-diameter portion having an end surface 16 and a large-diameter portion guided by the guide chamber 14, and the end surface of the large-diameter portion is in contact with a resilient member 13 provided at the bottom of the guide chamber 14. The resilient member 13 is preferably a disc spring, but may be a coil spring or the like.

  A return pin 11 is fixed to the movable mold plate 5 forming the outer peripheral portion 10 provided on the outer periphery of the cavity portion 8 so that the tip end portion 18 abuts against the end face 16. As shown in FIG. 2, when the mold is matched, the tip 18 of the return pin 11 presses the end surface 16 and pushes the protruding pin 12 against the elastic force of the elastic member 13. The tip 18 is concentric with the end surface 16 and smaller in diameter than the end surface 16 and is exemplified as a tapered shape. However, the tip 18 may be eccentric within a range where the end surface 16 can be contacted, or larger in diameter than the end surface 16. Even so, it may be arranged so as to be eccentric and partly in contact with the end face 16, and the cross section may not be circular, and may be a straight column shape instead of a tapered shape. In this manner, a molded product release device is constituted by the protruding pin 12, the elastic member 13 and the return pin 11. A plurality of molded product release devices are provided on the outer peripheral portion 10.

  Next, the operation of the molded product release device of the present invention will be described including the molding of the molded product 17. An injection device (not shown) plasticizes a raw material resin to form a molten resin and stores it at a tip portion of the injection device. The molten resin is injected from the sprue part 6 through the gate 7 to the cavity part 8 including the outer peripheral part 10 through a nozzle (not shown) in contact with the end part of the sprue part 6. At this time, the cavity portion 8 is formed such that the return pin 11 pushes the protruding pin 12 and the end surface 16 is flush with the surface of the outer peripheral portion 10. The molten resin injected into the cavity portion 8 including the outer peripheral portion 10 is cooled by a mold and solidified to become a molded product 17.

  When the molded product 17 is sufficiently solidified in the mold, the movable mold 4 is separated from the fixed mold 1 as shown in FIG. At this time, since the return pin 11 is also separated from the end face 16 of the protruding pin 12, the protruding pin 12 protrudes and advances until it abuts against the wall surface of the guide chamber 14 by the elastic force of the elastic member 13. As a result, the end surface 16 presses the molded product 17 to release it from the surface of the cavity portion 8 of the fixed mold plate 2. At this time, the sprue formed by the sprue portion 6 is cut at the gate 7 portion and taken out from the gap formed between the fixed mold plate 2 and the release plate 3. The released molded product 17 is naturally dropped or taken out from between dies by a take-out device (not shown).

  If the molded product 17 is a fuel cell separator, the portion corresponding to the outer peripheral portion 10 partitioned in the groove shape by the boundary convex portion 9 is an unnecessary portion as a separator and is cut off in a later process. The through hole 19 formed by the above does not matter. In addition, when a molded product has a through-hole in a product part, you may provide a molded product mold release apparatus in a product part so that the through-hole may be the through-hole 19. FIG.

  Since the molded product release apparatus of the present invention is configured and operates as described above, when applied to a molding machine based on a multi-stage press or stack mold for mass production of thin plate-shaped molded products such as fuel cell separators. It is extremely effective in that the mold can be simplified and thinned.

  The present invention is not limited to the embodiments described above, and various modifications can be added and implemented without departing from the spirit of the invention. For example, the ejector pin 12 and the elastic member 13 of the molded product release device are provided on the fixed mold plate 2 and the return pin 11 is provided on the movable mold plate 5, but the ejector pin 12 and the elastic member 13 are provided on the movable mold plate 5. The return pin 11 may be provided on the fixed mold plate 2.

It is principal part sectional drawing of the metal mold | die provided with the molded article mold release apparatus of this invention. It is an expanded sectional view which shows the state which shape | molds the molded article with the metal mold | die provided with the molded product mold release apparatus of this invention. It is an expanded sectional view which shows the state which has released the molded product shape | molded with the metal mold | die provided with the molded product mold release apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed mold 2 Fixed mold plate 3 Release plate 4 Movable mold 5 Movable mold plate 6 Sprue part 7 Gate 8 Cavity part 9 Boundary convex part 10 Outer peripheral part 11 Return pin 12 Extrusion pin 13 Elastic member 14 Guide chamber 15 Installation Plate 16 End surface 17 Molded product 18 Tip portion 19 Through hole

Claims (2)

A molded product release device for a molded product of a molded product comprising a fixed mold and a movable mold,
A projecting pin provided on one of the fixed mold and the movable mold so that the end face is in contact with the molded article and is urged in a direction in which the molded product is projected by the resilient member, and a mold fixed to the other of the fixed mold and the movable mold A molded product release apparatus, comprising: a return pin that presses the end surface and pushes back the protruding pin so that the end surface of the protruding pin is positioned to form a part of a predetermined shape of the molded product at the time of alignment.   The molded product release apparatus according to claim 1, wherein the return pin is in contact with the end surface with an area smaller than an area of the end surface.

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