JPH0241172Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to an electroforming mold.

(Prior technology) A conductive film is formed on the surface of the model, an electroformed shell is deposited on this surface, a mold is placed over the electroformed shell, and a filler such as cement is filled between the mold and the electroformed shell. The present applicant previously filed a patent application in 1983 for an electroforming mold that was obtained by solidifying and holding the electroform shell and peeling off the model.
It was proposed in No. 153666, etc.

(Technical problem to be solved by the invention) By the way, when releasing the electroformed shell from the model for electroforming, it is difficult to release the electroformed shell from the model even if the electroformed shell is installed thickly, even if the electroformed shell is relatively large and has a complicated shape. There is a risk that distortion and deformation may occur.

Particularly in injection molds, the mating surfaces of the fixed and movable molds are required to be in uniform contact, and if they are uneven, burrs may occur on the molded product. If necessary, we build up the material, grind it, and match the molds to ensure uniform contact.

As mentioned above, the electroformed shell may be distorted and deformed, and when used in an injection mold, there is a high possibility that uneven contact between the mating surfaces of the molds will occur.

The present invention was made to solve the above-mentioned technical problems, and its purpose is to obtain a mold with a uniform mating surface, and to facilitate processing to ensure uniformity of the mold mating surface. To provide an electroformed shell which can be easily and inexpensively made into a mold such as an injection mold.

(Means for solving the technical problems) The means for solving the above technical problems is to add processing allowance for strain deformation adjustment of the required width and required amount of protrusion to the mold matching surface of the electroformed shell. This means that it is integrally formed as a part.

(Operation by the above means) According to the above means, since there is a machining allowance on the molding surface when releasing the electroformed shell from the molding surface, this is ground, etc., and the molding surface is free from distortion and deformation. can get.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the manufacturing state of an electroforming mold. 1 is an electroforming model, on the surface of which is formed a protrusion 1a that will later form the molding surface of the female mold, and around this is a recess that is one step lower. 1b is formed, and a flat part 1c which is raised one step higher is formed on the outer side of the recessed part 1b. Such a flat part 1
A presser plate 2 made of stainless steel or the like is placed on the upper surface excluding a part of the inner side of c, a downwardly open recess 2a is formed in a part of the presser plate 2, and a mounting hole 2b is formed in the ceiling of the presser plate 2. Form. Projection 1 of such model 1
a, a conductive peeling film 3 is formed so as to completely cover the concave portion 1b, the presser plate 2, and the flat portion 1c excluding the presser plate 2;

Next, the model 1 is immersed in an electrolytic solution, and a metal such as nickel is deposited on the coating 3 to form an electroformed shell 4. A machining allowance 4b is formed around the concave molding part 4a of the electroformed shell 4 by a concave part 1b, protruding downward from the flat surface 4c. shall be.

A sprayed layer 5 made of nickel or the like for reinforcement is formed on the above electroformed shell 4, and in the embodiment, cooling pipes 6 are embedded in the sprayed layer 5, and a mold 7 is placed on the above electroformed shell 4.
is mounted, and the peripheral part of this is tied to a bolt 8 passed through the peripheral part of the electroformed shell 4 from the concave part 2a of the holding plate 2 through the hole 2b, and the peripheral part of the holding plate 2 and the peripheral part of the formwork 7 are connected. The peripheral part of the electroformed shell 4 is sandwiched between them. The bolt 8 is screwed through a through hole 1b provided around the model 1.

By the way, the electroformed shell 4 before the formwork 7 was set,
In the embodiment, before forming the thermal spray layer 5, the injection passage member 9 is set, and after the mold 7 is set, a filler 10 such as cement is injected through the filling port 7a, and is filled and solidified to form a mold as shown in FIG. Mold 11 is obtained.

Model 1 was then released from the electroformed shell 4, and a portion of this state is shown in an enlarged manner in FIG.

After mold release, the machining allowance 4b is ground or otherwise flushed with the adjacent flat portion 4c to form a mold matching surface.

(Effects of the invention) As is clear from the above, according to the invention, when manufacturing an electroformed mold, the distortion of the mold mating surface that occurs when releasing the electroformed shell from the model is due to the machining allowance. This can be formed flat by grinding, etc., improving the precision of the electroforming mold and the precision of the molded product. It has the advantage of being easy to manufacture without increasing the number of man-hours.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of an electroforming mold manufactured, and FIG. 2 is an enlarged longitudinal cross-sectional view of the main part thereof. In the drawing, 4 is an electroformed shell, 4b is a machining allowance, and 11 is an electroformed mold.

Claims (1)

[Scope of utility model registration request] In an electroforming mold in which the mold is constructed of the electroformed shell surface with the back side backed up, a machining allowance for strain deformation adjustment of the required width and required amount of protrusion is applied to the mold mating surface of the electroformed shell on one side of the electroformed shell. An electroforming mold characterized in that the parts are integrally formed.