JPS592114Y2 - Mother mold for electroforming - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a matrix for producing a mold by electroforming.

For example, molds manufactured by electroforming are used to manufacture molded products with complex surface irregularities, but the molds must have air vents or holes for injection molding or blow molding. In the case of vacuum forming, it is necessary to provide suction holes.

Conventionally, these holes were formed using a drill after electroforming, but since the surface shape of the mold has an uneven shape that is the opposite of the surface of the molded product, it was necessary to drill the holes. The holes tend to be located at positions corresponding to the convex parts of the molded product, resulting in an unsightly outer shape of the molded product. Machining with a drill is troublesome, and when making multiple molds, the hole positions may be different between the molds. There were drawbacks such as the

The present invention was developed in view of the above circumstances, and its purpose is to form a hole in an inconspicuous position corresponding to the concave part of a molded product, eliminate the need for troublesome drilling, and position the hole between molds. An object of the present invention is to provide a mother mold for electroforming, which can obtain a uniform molding die with a constant value.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a mother mold made of wood, plastic, metal, or the like, and a surface portion 2 of this mold has protrusions 2a and recesses 2b that match the external shape of a molded product (not shown).

For example, when producing a molded product with a leather pattern on the surface, natural leather is adhered to the surface of the matrix.

Reference numeral 3 denotes a fitting hole formed at a position corresponding to the recess 2b of the surface portion 2, into which a hole forming pin 4 made of aluminum and having a predetermined length is removably fitted.

In this case, the orientation direction of the fitting hole 3 needs to match the mold removal direction, which will be described later.

The surface portion 2 of the mother mold 1 in which the hole forming pin 4 is fitted into the fitting hole 3 is subjected to conductive processing in a well-known manner, and then electroformed to a predetermined thickness. For example, an electroformed metal layer 5 of nickel is formed.

Incidentally, it is preferable to mask the tip end 4a of the hole forming pin 4 in advance to prevent nickel from being electrodeposited.

When the electroforming process is completed in this way, the hole forming pin 4 penetrates the electroformed metal layer 5, and at the penetrating portion, the nickel electroformed metal layer 5 is placed around the outer periphery of the aluminum hole forming pin 4. is in close contact due to electrodeposition.

After the electroformed metal layer 5 is formed in this way, the electroformed metal layer 5 is released from the surface part 2 of the mother mold 1 by a known method (see FIG. 2), and the hole forming pins 4 are then It is made to escape from the fitting hole 3 while being integrated with the cast metal layer 5.

When the mold 6 formed of the electroformed metal layer 5 is placed in, for example, a high-temperature alkaline solution, the aluminum hole-forming pins 4 are melted and holes 7 are formed through them.
(See Figure 3).

In this case, the mold 6 is made of nickel and has alkali resistance, and will not cause any problems.

The hole forming pins 4 may be appropriately selected and used depending on the material of the mold 6 so that they can be melted by chemicals or heat without damaging the mold 6, and the holes 7 can be formed as described above. However, when the mold 6 is lined with synthetic resin, zinc, etc., a porous layer is formed on the back side of the mold 6, and a plurality of molds are formed through that layer. It is conceivable to use the hole 7 in such a way that it communicates with the atmosphere or a suction device.

As is clear from the above description, the present invention allows holes to be formed in inconspicuous positions corresponding to the recesses of the molded product, eliminating the need for troublesome drilling, and making it easy to create uniform molds with fixed hole positions. Moreover, it is possible to provide a mother mold for electroforming that can be obtained quickly.

[Brief explanation of the drawing]

1 to 3 are vertical sectional views showing one embodiment of the present invention. In the drawings, 1 is a mother die, 2 is a surface portion, 3 is a fitting hole, 4 is a hole forming pin, 5 is an electroformed metal layer, and 6 is a mold.

Claims (1)

[Scope of utility model registration request] In a mother mold for producing a mold by depositing an electroformed metal layer of a predetermined thickness on the surface by electroforming, the mother mold has an uneven shape that matches the uneven shape of the molded product. A fitting hole is formed in a predetermined portion of the surface of the mold, and the mold is removably fitted into the fitting hole so as to protrude a predetermined length from the surface of the mother mold before electroforming, and The electroformed metal layer is embedded in the mold so as to penetrate through the electroformed metal layer, and when the mold is released from the mother mold, it is integrally bonded to the electroformed metal layer and detached from the fitting hole, and is further separated. A mother mold for electroforming processing characterized by providing a hole forming pin that is melted after the mold.