JPH0443294Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement of a resin molding die used for manufacturing a resin molded product having a hole.

(Prior Art) A resin molded product having a hole, for example, as shown in FIG.
Conventional resin molding molds used for manufacturing by transfer molding and other molding methods include:
Some examples are illustrated in cross-sectional views in FIGS. 3 and 4.

Here, the molding die shown in FIG. By forming the core part 5 corresponding to the contour, it is possible to form the required cavity 6 by fitting the core part 5 into the recess 3 as shown, and further, The molding die shown in FIG. The peripheral wall portion of the recess 3 facing the protrusion 8 is formed by an insert member 9 fixed to the cavity block 2 by tight fit.

According to such a molding die, when manufacturing a resin molded product by injecting resin into the cavity 6, the molded product 1 is formed as shown in FIG. A desired hole 1b is formed in one side wall 1a.

By the way, the resin molded product 1 manufactured in this way is usually removed from the core part 5 by removing the resin from the mold with the cavity block 2 and core block 4 in an open state as shown in FIG. Only the core portion 5, on which the molded product 1 is engaged and attached, protrudes somewhat downward from the main body portion 4a of the core block 4, and then, by hand, the side wall of the resin molded product 1 having the hole 1b is removed. This is done by elastically deforming the part in the direction away from the core part 5 and removing the resin molded product 1 from the core part 5 while avoiding interference between the side wall and the projection part 8.

(Problems to be Solved by the Invention) However, in such conventional molding molds, scratches are generated on the peripheral wall 7 due to the friction between the protrusion 8 and the recess peripheral wall 7. In addition to the problem of surface scratches occurring on the molded product, there was also the problem of insertion into the hole 1b of the molded product 1 due to the creation of a gap between them due to friction between the two.

Although the molding die shown in FIG. 4 has the advantage that these problems can be solved by replacing the insert member 9, this mold does not replace the insert member 9 with the carrier. Another problem was that since it was fixed to the biting block 2 by tight fit, a large number of man-hours were required to replace it.

This invention was made by focusing on these problems of the conventional technology, and it is a resin molding method that can effectively prevent the occurrence of scratches and insertions in resin molded products with extremely simple operations. It provides molds.

(Means for Solving the Problems) The resin molding mold of this invention particularly allows the peripheral wall portion of the recessed portion of the cavity block, which faces the protrusion formed in the core portion, to be inserted into the cavity block. The insertion member is made of an insert member that can be moved forward and backward relative to the cavity block, and its forward and backward positions are specified by screw means attached to the cavity block.

(Function) With this mold, the surface of the insert member may be damaged by abrasion or
When wear occurs, the resin molded product is extremely easily prevented from being scratched or inserted by slightly moving it forward using screw means and removing the surface scratches by polishing or other means. It can be prevented.

(Example) This invention will be explained below based on illustrated examples.

FIG. 1 is a sectional view showing one embodiment of this invention, and in the figure, parts similar to those shown in the conventional example are designated by the same numbers.

In other words, 2 in the figure represents the cavity block, and 3 represents the cavity block.
7 indicates a recess provided therein, 7 indicates a peripheral wall thereof, 4 indicates a core block, 5 indicates a core portion provided therein, and 8 indicates a protrusion projecting from the core portion 5, respectively.

Here, the peripheral wall portion of the recess 3 facing the protrusion 8 is formed by the tip surface 13 of the insertion member 12 fitted into the hole 11 of the cavity block 2,
The insertion member 12 can be moved forward and backward with respect to the cavity block 2, or in other words, with respect to the recess 3, under the guidance of the hole 11.

Here, various materials can be selected for the insertion member 12, but when relatively soft metal materials such as copper and aluminum, rubber, rubber-like elastic materials, plastics, etc. are selected, Finishing and refinishing of the tip surface 13 by polishing or the like can be performed extremely easily.

Here, a bolt 15 as an example of a screw means is passed through the bracket 14 fixed to the cavity block 2, and the front end surface of the bolt 15 is connected to the rear end surface of the insertion member 12, either indirectly or directly. In the figure, by making indirect contact,
The retraction limit position of the insertion member 12 within the hole 11 is specified. That is, by advancing this bolt 15 with respect to the bracket 14, the insertion member 12 can be pushed out into the recess 3, and the displacement of the insertion member 12 in the backward direction is caused by the bolt 1
By tightening the lock nut 16 screwed into the lock nut 5, this will always be reliably prevented.

Furthermore, in the illustrated example, the rear end surface of the insertion member 12,
In order to bring about indirect contact with the bolt tip surface,
A spacer 18 is connected to the insert 12 by a stud 17 and also connected to the insert 12.
In order to prevent the insertion member 12 from slipping out of the hole 11 forwardly and the rotational movement of the insertion member 12 within the hole 11, a groove 19 is provided adjacent to the hole 11 and extends parallel to the hole 11. The pin 20 provided on the spacer 18 is positioned at. According to this, the withdrawal of the insertion member 12 is prevented by the contact between the deep end wall of the groove 19 and the pin 20, and the rotational movement of the insertion member 12 is prevented by the contact between the deep end wall of the groove 19 and the pin 20. This will be prevented by the contact between the two.

According to the mold configured in this manner, the protrusion 8 is formed on the tip surface 13 of the insertion member 12.
If scratches, abrasion, etc. occur due to the collision of the insert member 1, the insertion member 1 can be removed by operating the bolt 15.
2 is moved forward slightly and its tip surface 13 is rehabilitated by polishing, for example, to sufficiently prevent scratches on the surface of the resin molded product 1 and insertion into the hole 1b. It can be prevented.

This invention has been explained above based on illustrated examples, but
This invention can also be applied to the case where one or more holes are formed in a curved or folded wall of a molded product. It is preferable to use a material whose tip surface, including a curved surface, a bent surface, etc., can be easily renovated.

It is also possible to have the rear end surface of the insertion member directly contact the front end surface of the bolt, but if silicone rubber or other elastic material is selected as the insertion member, it may be By bringing it into contact with the bolt through the spacer,
It is possible to effectively prevent the tip surface from deforming backward.

(Effect of the invention) Therefore, according to this invention, even if scratches, abrasion, etc. occur on the peripheral wall portion of the recess facing the protrusion, the peripheral wall portion can be rehabilitated extremely easily and quickly. This makes it possible to sufficiently effectively prevent the occurrence of scratches on the surface of the resin molded product.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of this invention, Fig. 2 is a perspective view illustrating a resin molded product, Figs. , is a sectional view showing an example of removal from the core part. DESCRIPTION OF SYMBOLS 1... Resin molded product, 1b... Hole part, 2... Cavity block, 3... Recessed part, 4... Core block, 5... Core part, 7... Peripheral wall, 8... Protrusion part, 11 ... hole, 12 ... insertion member, 13 ... tip surface, 15 ... bolt.

Claims (1)

[Claims for Utility Model Registration] Recessed portion 3 formed in cavity block 2
and a resin molding die comprising a core part 5 formed on the core block 4 and fitted into the recessed part, and a protrusion part 8 protruding from the core part and abutting against the peripheral wall 7 of the recessed part, The peripheral wall portion of the recessed portion 3 facing the protrusion 8 is inserted into the cavity block by an insertion member 12.
The insertion member is made to be movable forward and backward with respect to the cavity block, and its forward and backward positions are specified by screw means 15 attached to the cavity block.