JPH01138050A - Die structure for watch case - Google Patents

Abstract

PURPOSE:To enable forming of a core without any influence of outline shape of core surface and size by fitting machine inserting part forming member (core) for watch case with screws from back face of the core in an insert type die. CONSTITUTION:Cavity 6, core support 2 and ejector pins 7 are engaged with a cavity plate 8 in the die for die casting. The core 1 cutting the screw on the back face is fitted with the screw from the back face of the core support 2. As the guide groove 4 is arranged at front side in the core support 2 positioning of the core can be easily executed. By such construction, even if the core is small size, there is no problem, which remained thickness of the core is eliminated and molten metal is penetrated into spot facing part. By this method, as the forming of the core can be executed without any influence of the outline shape of the core surface and the size, the extremely small watch case can be produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold structure for a watch case manufactured by a manufacturing method such as die casting or plastic injection molding.

[Conventional technology]

Conventionally, as shown in FIG. 4, numeral 6 is a cavity in which the core 1 is engaged, and a counterbore 3 is provided from the top of the core 1 and screwed to the core support 2 from the front.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, when fixing the core, for example, when fixing the core 1 for an extremely small watch case to the core support 2, since the core 1 is small, if the core is counterbore 3 from the front side, the remaining thickness is 1.
The problem is that a is missing, making it impossible to manufacture extremely small watch cases.

In addition, even if there is some remaining meat, hot water (melted material) may be poured into the counterbore 3, making it impossible to remove the screws, which results in a waste of about 10 minutes per setup. It took time.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a mold structure for manufacturing extremely small watch cases.

[Failure to solve the problem]

The watch case mold structure of the present invention is characterized in that the watch case core in the nesting mold is screwed from the back side of the core.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a plan view of a cavity plate portion of a die-casting mold in an embodiment of the present invention.

8 is a cavity plate, and the cavity 6, the core support 2, and the ejector turbine 7 are engaged with the cavity plate 8.

FIG. 2 is a sectional view taken along the line AA' in FIG. The core 1, which has a thread cut on its back surface, is fixed to the back side of the core support 2 by threading. A guide groove 4 is provided on the front side of the core support 2 so that the core can be easily positioned.

FIG. 3 is a partial sectional view showing another embodiment of the present invention,
A guide pin 5 is provided in the core support 2 in place of the guide groove 4 shown in FIG. 2, and a hole in which the guide pin 5 is engaged is formed in the core 1 so that the core 1 is positioned.

By adopting such a structure, even if the core becomes smaller, there will be no remaining meat on the core, and problems such as hot water being poured into the spot facing portion will not occur.

In addition, the method of attaching the core to the core support is by screwing, and whether it is screwed from the front surface of the conventional core or from the back of the core of an ultra-small model, the only difference is the core support, and everything else is the same. It can be used for.

This manufacturing method can also be applied to metal casting and plastic injection molding.

〔Effect of the invention〕

As described above, according to the present invention, by screwing the watch case core of the nesting mold from the back side of the core, the core can be attached to the back side of the core without being affected by the contour shape and size of the core surface. Since the core can be molded as long as the space necessary for screw fixing can be secured, it has the effect of making it possible to manufacture extremely small watch cases.

Moreover, it has the effect of being applied not only to watch cases but also to various parts other than bag-shaped watch cases.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention, and is a plan view of a cavity plate portion of a die-casting mold. 2 and 8 are sectional views taken along the line AA' in FIG. 1. FIG. 4 is a sectional view of a conventional core attachment method. 1...Core 2...Core support and above Applicant: Seiko Epson Corporation

Claims (1)

[Claims] A watch case mold structure characterized in that, in a nesting mold, a molded member (hereinafter referred to as the core) that is inserted into the mechanical body of the watch case is screwed from the back side of the core.