JP2011148093A - Method of ejecting molded article and molding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding apparatus for releasing a molded article having undercut portions from a die. <P>SOLUTION: The molding apparatus 1 for releasing the molded article 7 having undercut portions 7a, 7b from dies 2, 3, ... includes inclined cores 6a, 6b for forming the undercut portions 7a, 7b, pushing pins 11, 12 to be projected from the inclined cores 6a, 6b, sliding plates 10a, 10b provided on a lower die 3 where base end portions 11a, 12a of the pushing pins 11, 12 are configured to slide, and elastic members 13, 14 for pushing the pushing pins 11, 12 against the sliding plates 10a, 10b. When the inclined cores 6a, 6b are moved in a direction where the inclined cores 6a, 6b are separated from the molded article 7, the pushing pins 11, 12 are projected from the inclined cores 6a, 6b by the amount of the movement and push the molded article 7 so as to form a gap G between the molded article 7 and the inclined cores 6a, 6b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and a molding apparatus for releasing a molded product having an undercut portion from a mold.

As a method of rolling up an undercut portion of a molded product and releasing the molded product from a mold, for example, as described in Patent Document 1, a method of rolling up a molded product with a so-called sucker is known. .

Japanese Utility Model Publication No. 2-80424

However, in the invention described in Patent Document 1 using a suction cup, there is a problem that it is difficult to realize an accurate rolling amount due to the bending deformation of the suction cup, which is an elastic body.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to provide a molded product having an undercut portion that can be removed from the mold and taken out. An object of the present invention is to provide a method for taking out an article and a molding apparatus.

In order to solve the above-mentioned problem, the invention according to claim 1 is a method of releasing a molded product having an undercut portion from a mold, and forming a gap between the mold and the undercut portion. Forming step, nail insertion step of inserting the nail of the take-out machine into the gap formed in this gap formation step, and forming the nail inserted in the gap in this nail insertion step by pulling the undercut part away from the mold A release process for releasing the product is provided.

The gap can be formed by moving the mold in a direction away from the molded product.

Further, the gap may be formed by an extrusion pin that protrudes from the inside of the mold at the same time as the mold moves away from the molded product.

The invention according to claim 4 is a molding apparatus for releasing a molded product having an undercut portion from a mold, an inclined core for molding the undercut portion, an extrusion pin protruding from the inclined core, and the extrusion pin It consists of a sliding plate provided on the mold body where the base end of the sliding part and an elastic member that presses the pushing pin against this sliding plate, and when the inclined core moves away from the molded product, the amount of movement The extrusion pin protrudes from the inclined core to extrude the molded product, thereby forming a gap between the molded product and the inclined core.

According to the first aspect of the present invention, a gap is formed between the mold and the molded product so that the nail can be inserted, and then the nail of the take-out machine is inserted into the gap to roll up the undercut portion. Since the product is released from the mold, the amount by which the undercut portion is rolled up can be minimized. In addition, since the amount of rolling up the der cut portion can be minimized, the molded product can be quickly removed from the mold without adversely affecting the quality of the molded product.

By moving the mold away from the molded product, a gap is formed between the mold and the molded product, so that the nails of the take-out machine can be inserted with a simple configuration.

Also, if the extrusion pin protrudes from the inside of the mold and a certain gap is formed between the mold and the molded product, the take-out machine can be used even in the case of a molded product that has low rigidity and is hung on the inclined core. It becomes possible to insert the nail.

According to the invention which concerns on Claim 4, a fixed clearance gap can be reliably formed between a molded article and an inclination core by the protrusion from the inclination core of the extrusion pin accompanying the movement of an inclination core and the movement of an inclination core. it can.

Overall explanatory view of the molding apparatus according to the present invention It is explanatory drawing of a shaping | molding apparatus, (a) is the state before extrusion molding after mold opening, (b) is the state after extrusion extrusion FIG. 4 is an explanatory diagram of the operation of the molded product take-out method and molding apparatus according to the present invention, where (a) is a molded state, (b) is an open state of an upper mold and an outer slide core, (c) is an extruded pin extruded state, ) Is the nail insertion state of the take-out machine, (e) is the rolled state by the nail, (f) is the take-out state of the molded product by the take-out machine.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a molding apparatus 1 according to the present invention includes an upper mold 2 that moves up and down, a lower mold 3 that faces the upper mold 2, and left and right outer slides that slide left and right along the lower mold 3. It consists of cores 4a and 4b, left and right inclined cores 6a and 6b forming outer slide cores 4a and 4b and cavity 5, and the like.

Undercut portions 7a and 7b are formed at the left and right end portions of the molded product 7 by the left and right inclined cores 6a and 6b. Such a molded product 7 corresponds to a front fender of a motorcycle.

  The left and right inclined cores 6a and 6b are connected to one ends of the rods 8a and 8b, respectively. The other ends of the rods 8 a and 8 b are connected to a push plate 9 disposed below the lower mold 3. Then, the inclined cores 6a and 6b are moved up and down along the lower mold 3 via the rods 8a and 8b when the push plate 9 is moved up and down by a driving means (not shown).

And after shaping | molding, the left inclination core 6a and the right inclination core 6b approach each other, raising along the lower mold | type 3 with the raise of the push plate 9 which inclined and connected rod 8a, 8b. Then, a gap is formed between the molded product 7 and the inclined cores 6a and 6b.

Further, the left and right inclined cores 6a and 6b are provided with push-out pins 11 and 12 that move up and down while sliding the base end portions 11a and 12a on the sliding plates 10a and 10b provided inside the lower mold 3, respectively. Has been. The push-out pins 11 and 12 are always pressed against the sliding plates 10a and 10b by elastic members 13 and 14 that are contracted in the inclined cores 6a and 6b.

  When the push plate 9 is at the lower end, the push pins 11 and 12 are entirely located inside the inclined cores 6a and 6b, as shown in FIG. 2A, and when the push plate 9 is at the upper end, As shown in FIG. 2B, the inclined cores 6a and 6b move in a direction approaching each other, so that they protrude relatively from the inclined cores 6a and 6b. Since the push pins 11 and 12 are always pressed against the sliding plates 10a and 10b by the elastic members 13 and 14, they do not move in the protruding direction.

  After the molding, the push plate 9 rises, the left inclined core 6a and the right inclined core 6b move in a direction approaching each other, and the push pins 11 and 12 protrude relatively from the inclined cores 6a and 6b. Since the extrusion pins 11 and 12 push the undercut portions 7a and 7b of the molded product 7, the undercut portions 7a and 7b are released, and a certain gap is surely provided between the molded product 7 and the inclined cores 6a and 6b. G is formed.

By providing the extrusion pins 11 and 12 as described above, when the rigidity of the molded product 7 is weak, the molded product 7 is stuck to the inclined cores 6a and 6b, and the molded product 7 is simply moved by the inclined cores 6a and 6b. And a case where it is difficult to form a gap between the inclined cores 6a and 6b. Thereby, a fixed gap G can be secured between the molded product 7 and the inclined cores 6a and 6b after molding.

  The procedure from the molding of the molded product 7 to the removal of the molded product 7 will be described for the molded product retrieval method and the molding apparatus using the method according to the present invention configured as described above.

First, as shown in FIG. 3A, the left and right inclined cores 6a and 6b, the left and right outer slide cores 4a and 4b, the upper mold 2 and the lower mold 3 are closed, and a molded product having undercut portions 7a and 7b. 7 is molded. At this time, the push pins 11 and 12 are located inside the inclined cores 6a and 6b.

Next, as shown in FIG. 3 (b), after molding, the upper mold 2 is opened, and then the left and right outer slide cores 4a and 4b are opened to make the mold open.

  Next, as shown in FIG. 3C, the push plate 9 is raised to the rising end. Then, the left inclined core 6a and the right inclined core 6b move in a direction in which they approach each other, and the push pins 11 and 12 relatively protrude from the inclined cores 6a and 6b.

A fixed gap G (for example, about 8 mm) is formed between the molded product 7 and the inclined cores 6a and 6b by the movement of the left and right inclined cores 6a and 6b in the approaching direction and the protrusion of the push pins 11 and 12. (Gap forming step).

Next, as shown in FIG. 3D, the take-out machine 20 is lowered, and the claws 22a and 22b attached to the left and right arms 21a and 21b of the take-out machine 20 are formed between the molded product 7 and the inclined cores 6a and 6b. It inserts into the gap G in the vicinity of the undercut portions 7a and 7b formed between them (claw insertion step).

Next, as shown in FIG. 3 (e), the left and right arms 21a, 21b of the take-out machine 20 are operated, and the undercut portions 7a, 7b are pulled up by the claws 22a, 22b (mold release step).

Next, as shown in FIG. 3 (f), the take-out machine 20 grips and raises the molded product 7 with the undercut portions 7 a and 7 b being rolled up by the claws 22 a and 22 b. Then, the molded product 7 is completely released from the molding apparatus 1. Thereby, the taking-out operation of the molded product 7 is completed.

  In the embodiment of the present invention, the case where the molds 2, 3,... Are installed so that the release direction of the upper mold 2 is vertical is described. The molds 2, 3... May be installed so that the mold 2 is rotated so that the mold releasing direction of the upper mold 2 is horizontal.

According to the present invention, first, a gap is formed between the mold and the molded product so that the nail can be inserted, and then the nail of the take-out machine is inserted into the gap to roll up the undercut portion and release the molded product. Since the mold is formed, it is possible to provide a method of quickly removing the molded product from the mold without adversely affecting the quality of the molded product by minimizing the amount to be rolled up.

DESCRIPTION OF SYMBOLS 1 ... Molding apparatus, 2 ... Upper mold, 3 ... Lower mold, 4a, 4b ... Outer slide core, 6a, 6b ... Inclined core, 7 ... Molded product, 7a, 7b ... Undercut part, 8a, 8b ... Rod, 9 ... push plate, 10a, 10b ... sliding plate, 11, 12 ... push pin, 11a, 12a ... proximal end, 13, 14 ... elastic member, 20 ... take-out machine, 21a, 21b ... arm, 22a, 22b ... claw , G ... Gap.

Claims (4)

A method of removing a molded product having an undercut part from a mold by taking it out, and forming a gap between the mold and the undercut part, and taking out into a gap formed in the gap forming process A nail insertion process for inserting a machine nail, and a mold release process for releasing the molded product by pulling the nail inserted in the gap in this nail insertion process in a direction in which the undercut part separates from the mold. A method for taking out the molded product. 2. The method of taking out a molded product according to claim 1, wherein the gap is formed by moving the mold in a direction away from the molded product. 2. The method for taking out a molded product according to claim 1, wherein the gap is formed by an extrusion pin that protrudes from the mold at the same time as the mold moves away from the molded product. How to take out. A molding apparatus for releasing a molded product having an undercut portion from a mold, an inclined core for molding the undercut portion, an extrusion pin protruding from the inclined core, and a base end portion of the extrusion pin slide It consists of a sliding plate provided on the mold body and an elastic member that presses the extrusion pin against the sliding plate. When the inclined core moves away from the molded product, the extruded pin protrudes from the inclined core by the amount of movement. A molding apparatus characterized in that a gap is formed between a molded product and an inclined core by extruding the molded product.

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