JPH04201414A - Manufacture of mold for forming plastic or the like - Google Patents

Abstract

PURPOSE:To reduce the labor and time of fitting operation and, at the same time, contrive to improve the accuracy of the operation by a method wherein forming is performed by electrical discharge machining after the parting faces of the respective parts of split molds under roughly finished state are joined together with electrically conductive adhesive. CONSTITUTION:In a built-in mold mainly for casting or the like, excluding the fittings of the parting faces (PL) of split molds A, B, C, D, E and F and after the application of releasant in advance to only the design parting line, respective parts are mated and joined together with electrically conductive adhesive 12. Finally, a top force or a bottom force (front mold or rear mold) is fitted by electrical discharge machining.

Description

[Detailed description of the invention] [Industrial application field] Manufacturing of various molds such as molding of plastics and foamed plastic products.

[Conventional technology]

Conventionally, when manufacturing a built-in mold with a dividing surface (PL line) by electrical discharge machining, each divided mold is prepared by forming the divided molds, for example, A, B, C, D, and E, as shown in FIGS. 3 and 4.

Composed of F and dividing plane l, 2.3.4.5.6.7.8
．． If there is 9, each dividing plane (PL line) 1.2.3
．． 4.5.6.7.8.9 parts (shaded parts in the drawings) are rubbed together in the rubbing process, one by one.
(or later model) was finished at 11.

[Problem to be solved by the invention]

Mainly for casting assembly molds: +1) If the shape or structure of the mold requires dividing, (2) If casting results in an undercut, (3) If dividing is required due to the production process. etc., when manufacturing molds, two-dimensional,
A three-dimensional dividing plane (PL line) is generated. The upper mold 10 or the lower mold 11 is finished according to the design drawing by rubbing these divided surfaces (PL lines) one by one in the rubbing process, so the rubbing work requires considerable effort and time. In addition, there were various problems such as problems with accuracy.

[Means to solve the problem]

Therefore, in the case of built-in molds such as casting, the process of rubbing together the dividing surfaces (PL lines) of each part of the split mold is omitted, and after rough finishing and curing with an electrically conductive adhesive, electrical discharge machining is performed. This is a method to complete the rubbing process.

[For production]

As with the ridges, the method of the present invention can be applied to multiple splitting surfaces (P
To avoid the troublesome rubbing process of the L line), a release agent is applied in advance to only the designated dividing surfaces in the design, and then an electrically conductive adhesive is applied and the adhesive is cured. (or the front mold) and the lower mold (or the rear mold) to complete the grinding process of the built-in mold. Not only can a large amount of time and labor be saved all at once, but also the accuracy can be significantly improved since manual rubbing is not required.

〔Example〕

To further explain the method of the present invention, it is mainly used in built-in molds such as casting, etc., for example, A.

Divided planes of B, C, D, E, F (PL line) 1.2.3
．． 4. Omit the rubbing process in 5.6.7.8.9, apply a mold release agent to only the designed dividing line in advance, and then glue each part together using an electrically conductive adhesive. After curing, the upper or lower mold (front mold or rear mold) is subjected to electric discharge machining and then rubbed together. Note that the reference numeral 13 in the figure indicates a completed mold.

〔Effect of the invention〕

As with the ridges, the method of the present invention can be applied to multiple splitting surfaces (P
To avoid the troublesome rubbing process of the L line), a release agent is applied in advance to only the designated dividing surfaces in the design, and then an electrically conductive adhesive is applied and the adhesive is cured. Type (
This method uses electric discharge machining for the molds of the front mold) and the lower mold (or rear mold) to complete the grinding process of the built-in mold, so it saves a considerable amount of time that was conventionally required for the grinding process of each dividing surface (PL line). In addition to being able to save time and labor all at once, it is also possible to produce extremely remarkable functions and effects, such as significantly improving accuracy since manual rubbing is not required.

[Brief explanation of the drawing]

The figures show one embodiment of the method of the present invention, in which Fig. 1 is a perspective view of the upper mold, Fig. 2 is a perspective view of the lower mold, and Fig. 3 (11 to (4)
), FIGS. 4(5) to 4(7) are explanatory views of the conventional process, and FIG. 5 is a perspective view of the completed mold. A,,B,C,D,E,F...Divided type, 1.2.34
．． 5.6.7.8.9...Division plane (PL line), 1
0...Upper mold or front mold, 11...Lower mold or rear mold, 12
...Electric conductive adhesive, 13...Completed model.

Claims (1)

[Claims] For built-in molds such as casting, the process of rubbing together the split surfaces (PL lines) of each part of the split mold is omitted, and after rough finishing and hardening with an electrically conductive adhesive, electrical discharge machining is performed. A method for manufacturing a mold, characterized by forming a mold.