JPS6351767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold structure for molding a timepiece dial.

[Conventional technology]

The conventional mold structure of a watch dial consists of an upper sub-mold and a lower sub-mold, and the mold parts such as punches, dies, knockouts, strippers, etc. that make up the upper sub-mold and lower sub-mold are made of metal. Because the dial requires many molding locations, it is manufactured using a combination of progressive molding and single-acting molding.

FIG. 1 is a plan view showing the appearance of a watch dial common to the conventional watch dial and the present invention; 1 is a dial board;
2 is a window hole, 3 is a center hole, 4 is a small hole for installing a time display piece, and 5 is a small hole for installing a name or mark.

FIG. 2 shows a prior art progressive strip layout. In the progressive die shown in Figure 2,
Divided into 2 to 3 multiple stages, feed reference hole 6
Processing is performed while ensuring the pitch. In combination machining using a single-acting die, two to three types of molds are required, and workability is extremely low because it is a single process. Generally, after forming the outer shape, center hole, window hole, etc. with the first mold, another mold with small diameter holes is used.
A two-step processing method is being implemented.

[Problem that the invention seeks to solve]

However, in the conventional technology mentioned above, the progressive mold requires high mold precision and the mold becomes large.
High-precision press machines and high-grade mold processing machines are required, and since the clearance of the mold is small, assembly and adjustment requires skilled technology, which increases the cost of the mold. , there are disadvantages such as increasing the cost of the dial. In addition, in combination processing using single-acting dies, a plurality of molds are required, and twice as many press machines are required, resulting in an increase in manufacturing costs.

The present invention is intended to solve these problems.The purpose of the present invention is to reduce the number of dial press molding processes, reduce mold manufacturing man-hours and press processing man-hours, and reduce the dial manufacturing process. The purpose of the present invention is to provide a mold structure for a watch dial that can reduce costs.

[Means for solving problems]

The mold structure of the watch dial of the present invention is comprised of an upper sub-mold and a lower sub-mold, in which the upper sub-mold is a shape forming die on which the outer shape of the dial is formed. 104, a knockout 105 that is slidably engaged with the outer shape forming die 104, and small hole punches 106, 107, and 108 that are engaged with the knockout 105 and form a plurality of small holes with different hole diameters in the dial. and has
The lower sub-mold includes a stripper 100 and the outer shape forming die 10 engaged with the stripper 100.
4, an outer shape forming punch 102 for forming the outer shape of the dial, and a small hole punching die 103 that is engaged with the outer shape forming punch 102 and forms a plurality of small holes with different hole diameters in the dial; It has a fixed compression punch 101 that is engaged with the stripper 100 and supports the small hole punching die 103. The protrusion is arranged to protrude from the upper surface of the stripper 100, and the small hole punching die 103 is made of an elastic member and has a flat surface that comes into contact with the dial and is flush with the top surface of the protrusion. It is characterized by being arranged so that.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples. FIG. 3 shows a main cross-sectional view of the mold structure of the watch dial according to the present invention.

The mold structure of the watch dial according to the present invention has a stepped portion 100a above the central part of the stripper 100 in the lower sub-mold.
The stripper has a ring-shaped punch 102 for forming the outer shape of the dial made of rubber, which is an elastic member, and a fixed compression punch 101 is fitted into a hole 100b below the center of the stripper. placed on the top surface of 101,
A small hole punching die 103 that is engaged with the ring-shaped inner wall 102a of the external forming punch and the hole 100b of the stripper is made of rubber, which is an elastic member. The upper sub-mold has an outer shape forming die 104 provided in the center with a hole 104a for forming the outer shape of the dial, and is fitted into the hole 104a.
In addition, the knockout 10 is provided with small holes 106a, 107a, and 108a, and a pattern is formed on the surface that comes into pressure contact with the dial plate, and is movable up and down.
5, and the narrow holes 106a, 107a and 10
It is composed of small hole punches 106, 107 and 108 which are fitted into the dial 8a and form small holes in the dial plate.

The processing process of the present invention will be described below. A dial substrate raw material 1a made of a copper alloy and an Al alloy is fed into a mold in the form of a short length or a hoop, and is sandwiched between a stripper 100 and a knockout 105. At this time, the external shape forming punch 102 installed inside the stripper is compressed, and the small hole punching die 1 inside the stripper is compressed.
03 is in a sealed state. In this state, when the dial substrate raw material 1a is lowered deeply, the stripper 100
moves downward, and the pressure of the small hole punching die 103 and the shape forming punch 102 is gradually increased until the shape forming punch 102 is near the shear resistance of the substrate raw material.
A half cut is made to fit the outer shape of the dial. If the stroke is continued to be lowered in this state, the pressure of the small hole punching die 103 is increased, and the dial substrate raw material 1a
moves upward while closely contacting the knockout 105. Fixed small hole punch 106, 107
and 108, the small hole is partially punched, or depending on the length of the small hole punches 106, 107 and 108, the small hole is punched completely. Further, the outer shape is also cut out by the outer shape forming die 104. When the bottom dead center of the stroke is set at this position and the upper sub-die rises, the pressure in the small hole punching die 103 is released and lowered, completing one process. Do this process continuously.

Furthermore, the small hole punching die 103 and the external shape forming punch 102 are not limited to elastic members such as rubber, but either one of them may be molded using a liquid.

[Effects of the Invention] As described above, according to the present invention, the punch 102 for forming the outer shape of the dial and the die 103 for punching small holes are each made of elastic members, while adopting a die structure of a complete punching type. The die 103 for punching a small hole does not require each hole portion corresponding to each punch for punching a small hole, which becomes a die, as in the conventional case.
The positions of 107 and 108 can be used in common regardless of their positions, and the punch 102 for forming the outer shape also corresponds to the hole of the die 104 for forming the outer shape, which is formed in the same way as the outer shape of the dial as in the conventional case. There is no need for punches with the same contour shape, and it is possible to form a complex dial shape as long as it is larger than the aforementioned shape, and a similar dial shape can be formed using a single punch. Therefore, the molding process of the small hole punching die 103 and the external shape forming punch 102 becomes extremely easy and the cost can be reduced. In addition, as mentioned above, since one of the punches and the die can be used in common, mold adjustment is extremely easy.
There is also an advantage that the model can be changed only by changing the 7, 108 and the outer shape forming die 104.

In addition, the press work, which was conventionally done in 2 to 3 steps, can now be done in one step, so the number of molds that were previously required for each process can be reduced to one, and setups such as installation and removal of molds can be done easily. It also has the effect of significantly reducing work and making it extremely efficient.

[Brief explanation of the drawing]

FIG. 1: A plan view showing the appearance of a timepiece dial common to the conventional watch dial and the present invention. FIG. 2: A strip layout diagram of a progressive type in the prior art. FIG. 3: A main sectional view of the mold structure of the watch dial according to the present invention. 1...Dial board substrate, 1a...Dial board substrate raw material,
2...Window hole, 3...Center hole, 4...Small hole for time display piece, 5...Small hole for name or mark embedded, 6...Reference hole for feed, 100...Stripper, 101...Fixed compression Punch, 102...Punch for external shape formation, 103...Die for punching small holes, 104
...Outline forming die, 105...Knockout,
106...Punch for punching small holes (center hole punch),
107... Punch for punching small holes (punch for punching window holes),
108...Punch for punching small holes (punch for punching display pieces and name holes).

Claims (1)

[Claims] 1. In the mold structure of a watch dial consisting of an upper sub-mold and a lower sub-mold, the upper sub-mold includes an outer shape forming die 104 in which the outer shape of the dial is formed, and a die 104 that slides into the outer shape forming die 104. a knockout 105 that can be engaged;
small hole punches 106, 107, 1 that are engaged with and form a plurality of small holes with different hole diameters on the dial plate;
08, and the lower sub-type has a stripper 10
0, an outer shape forming punch 102 that is engaged with the stripper 100 and forms the outer shape of the dial in correspondence with the outer shape forming die 104, and a hole diameter of the dial that is engaged with the outer shape forming punch 102. It has a small hole punching die 103 for forming a plurality of small holes with different diameters, and a fixed compression punch 101 that is engaged with the stripper 100 and supports the small hole punching die 103, and the outer shape forming punch 102 is made of an elastic member. The center portion thereof is formed with a protrusion, and the protrusion is disposed to protrude from the upper surface of the stripper 100, and the small hole punching die 103 is made of an elastic member, and the surface that comes into contact with the dial plate is What is claimed is: 1. A type structure of a watch dial, characterized in that it is formed flat and is disposed so as to be flush with the uppermost surface of the protrusion.