JPH05261755A - Synthetic resin mold - Google Patents

Abstract

PURPOSE:To provide a mold by which the cost can be reduced by rationalization of a process of a product to be mold. CONSTITUTION:This is a resin mold wherein when the first and second molds which are pressure-contacted to or separated from each other are provided and the first and second molds are pressure-contacted to each other, molding of a product to be molded is performed by performing casting of synthetic resin, after the molding of the product to be molded, the first and second molds are separated from each other, the product to lee molded is caused to be peeled off from the second mold 2 by ejection of an injector pin provided on the second mold 2 and the product to be molded is molded of a synthetic resin material. Then the subject mold is constituted so that since a parts supply pin 7 which is ejected or shunted to a stud part 3A of the product to be molded and a chute part 5 to which a bushing 4 is loaded are provided on the second mold 2 and the parts supply pin 7 is shunted at the molding of the product to be molded, the bushing 4 is supplied to the tip part of the parts supply pin 7 from the chute part 5 and then since the parts supply pin 7 is ejected, the bushing 4 is sent out to the stud part 3A and insertion of the bushing is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a synthetic resin molding die that includes a first mold and a second mold that are separated from each other, and that presses the first mold and the second mold to form a molded product of a synthetic resin material.

In recent years, housings, covers and the like used in electronic devices have come to be formed by moldings made of synthetic resin material in order to reduce the weight. The cost of such a molded product becomes important especially when it is mass-produced, and it is desired to form the molded product at a low cost.

[0003]

2. Description of the Related Art Conventionally, the structure is as shown in the conventional explanatory view of FIG. Figure 4 (a1) and (a2) are side sectional views, (b1)
(b2) is a sectional view of the stud portion.

As shown in FIG. 4 (a1), a first mold 1 having an injection port 1A and a second mold 2 are pressure-contacted with each other, and a synthetic resin material is injected from the injection port 1A to be molded. It was shaped to mold Item 3.

Further, the second mold 2 is provided with an ejector pin 6, and after the molded product 3 is molded, the first mold 1 and the second mold 2 are separated from each other. As shown in FIG. 3, the pressure indicated by the arrow F is applied to the ejector pin 6 to separate the molded product 3 from the second mold 2.

On the other hand, when a stud portion 3A for screwing a screw is provided on such a molded article 3, as shown in FIG. 4 (b1), the stud portion 3A is made of a metal capable of screwing a screw. Insert the ring-shaped bush 4 into the molded product, or heat the bush 4 after molding as shown in (b1) of Fig. 4 and press fit it into the stud portion 3A as indicated by arrow A. Is done.

Therefore, when the bush 4 is inserted into the stud 3A, the bush 4 is previously inserted into a portion where the stud portion 3A of the second mold 2 is to be formed, and the synthetic resin material is injected. When the bush 4 is fixed to the stud 3A, a hole 3B is formed at a position where the bush 4 is fixed, and the bush 4 is press-fitted after molding.

[0008]

However, since it is manually performed to insert the bush 4 into the second mold 2 in advance or press the bush 4 after molding, it is particularly necessary to When processing a large number of molded products 3, a lot of man-hours are required.

Therefore, there has been a problem that such manpower causes an increase in cost due to an increase in processing man-hours. Therefore, an object of the present invention is to reduce the cost by rationalizing the processing of the molded product.

[0010]

FIG. 1 is a diagram for explaining the principle of the present invention. As shown in FIG. 1, it is provided with first and second molds 1 and 2 which are pressed against each other or separated from each other. When the first and second molds 1 and 2 are in pressure contact with each other, a molding product 3 is molded by injecting a synthetic resin, and after molding the molding target 3,
The second mold 1 and 2 are separated from each other, and the molded product 3 is separated from the second mold 2 by the projection of the ejector pin 6 provided on the second mold 2, and the synthetic resin material is used. The molded product
A resin molding die for forming 3
Component supply pin that protrudes or retracts in the stud part 3A of
7 and the chute portion 5 for loading the bush 4 are the second
Provided in the mold 2, and when the component 3 is molded, the component supply pin 7 is retracted to supply the bush 4 from the chute 5 to the tip of the component supply pin 7, , The bush 4 by protruding the component supply pin 7
Is sent to the stud portion 3A, the bush 4 is inserted, and when the component supply pin 7 is projected, the ejector pin 6 is retracted and the component supply pin 7 is retracted. At this time, an interlocking mechanism 8 for interlocking the component supply pin 7 and the ejector pin 6 is provided so that the ejector pin 6 projects.

The above-mentioned problems can be solved by such a configuration.

[0012]

In other words, the second mold 2 is provided with the chute portion 5 for loading the bush 4 and the component supply pin 7 for feeding the bush 4 to the stud portion 3A. The bush 4 is adapted to be delivered by the protrusion of the component supply pin 7.

Further, the component supply pin 7 is the ejector pin 6
The ejector pin 6 is retracted when the component supply pin 7 is projected and the ejector pin 6 is projected when the component supply pin 7 is retracted. When molding 3, the bush 4 is delivered to the stud portion 3A, and after molding the molded product 3, the bush 4 is set by retracting the component supply pin 7 and
The protrusion of the ejector pin 6 allows the molded product 3 to be peeled off.

Therefore, it is possible to continuously mold the molded product 3, and it is possible to reduce the cost by rationalizing the processing because no manual intervention is required.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIGS. 2 is a side sectional view of an embodiment according to the present invention, FIG. 3 is an explanatory view of a component supply pin of the present invention, and (a) and (b) are side sectional views. Throughout the drawings, the same reference numerals denote the same objects.

As shown in FIG. 2, the second mold 2 is bushed.
A sheet portion 5 for loading 4 is provided, and a component supply pin 7 projecting from the stud portion 3A of the molded article 3 is provided.

Therefore, when the first and second molds 1 and 2 are pressure-welded to each other to inject the synthetic resin material from the injection port 1A of the first mold 1, the molded article 3 is molded. By the protrusion of the supply pin 7, the bush 4 is transferred to the stud portion 3A, and the bush 4 is inserted.

Further, as shown in FIGS. 3A and 3B, the component supply pin 7 is a plate which reciprocates as shown by arrows F1 and F2.
8D is formed by the push pin 7A locked through the guide 7C and the middle pin 7B fixed to the plate 8D so as to slide in the hollow portion of the push pin 7A. When the plate 8D moves in the direction of arrow F1. , By attaching the bush 4 to the tip 7D of the middle pin 7B, it protrudes to the stud portion 3A, and the plate 8D shows the arrow F2.
When moving in the direction, the middle pin 7B slides, the tip 7E of the extrusion pin 7A is retracted so that it is located directly below the chute 5, and the bush 4 dropped from the chute 5 by its own weight causes the bush 4 to tip 7E of the extrusion pin 7A. Is set to.

Therefore, when the plate 8D moves again in the direction of the arrow F1, the tip 7D of the middle pin 7B projects from the tip 7E of the push pin 7A, and the bush 4 is attached to the tip 7D of the middle pin 7B.

Further, the rack 8B is fixed to the plate 8D, the rack 8C is fixed to the plate 8E for ejecting and retracting the ejector pin 6, and the interlocking mechanism 8 formed by the pinion 8A that meshes with the racks 8B and 8C is provided. If provided, the component supply pin 7 can be retracted when the ejector pin 6 is projected, and conversely, the component supply pin 7 can be projected when the ejector pin 6 is retracted.

Therefore, when the molded product 3 is molded, the bush 4 is sent to the stud portion 3A by the projection of the component supply pin 7, and after molding, the ejector pin is used to separate the molded product 3 from the second mold 2. By making 6 project, the component supply pin 7 is retracted, and the bush 4 of the next product to be molded 3 can be set, so that continuous processing of the product to be molded 3 can be performed.

[0022]

As described above, according to the present invention,
A seat portion for supplying the bush to the second die and a component supply pin for delivering the bush are provided, and the component supply pin is formed so as to be interlocked with the ejector pin, so that the workpiece can be continuously processed. Can be

Therefore, the number of manufacturing steps can be reduced, the cost can be reduced, and the practical effect is large as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention.

FIG. 2 is a side sectional view of an embodiment according to the present invention.

FIG. 3 is an explanatory view of a component supply pin of the present invention.

FIG. 4 is a conventional explanatory diagram

[Explanation of symbols]

 1 1st type 2 2nd type 3 Molded item 4 Bushing 5 Chute part 6 Ejector pin 7 Component supply pin 8 Interlocking mechanism 3A Stud part

Claims (2)

[Claims] 1. A first mold and a second mold (1, 2) which are pressed against each other or separated from each other, and are synthesized when the first mold and the second mold (1, 2) are pressed against each other. Molded product by injecting resin (3)
After molding the molded product (3), the first and second moldings are performed.
The mold (1, 2) is separated from the mold (1, 2), and the ejector pin (6) provided on the second mold (2) projects the article (3) from the second mold (2). And a component supply pin which is a resin molding die for forming the molded product (3) from the synthetic resin material, and which projects or retracts in the stud portion (3A) of the molded product (3). 7) and a chute part (5) for loading the bush (4) are provided in the second mold (2), and the component supply pin (7) is retracted when the molded product (3) is molded. As a result, the bush (4) is supplied from the chute portion (5) to the tip of the component supply pin (7), and then the component supply pin (7) is projected so that the bush (4) 4) is sent to the stud portion (3A), and the bush (4) is inserted into the synthetic resin molding die. 2. The ejector pin (6) is retracted when the component supply pin (7) according to claim 1 is projected, and the ejector pin (7) is retracted when the component supply pin (7) is retracted. 6)
The synthetic resin molding die is characterized in that an interlocking mechanism (8) for interlocking the component supply pin (7) and the ejector pin (6) is provided so that the parts protrude.