JPS59102526A - Method of manufacturing collapsing die for wristwatch band - Google Patents

Abstract

PURPOSE:To provide a collapsing die for forming a high quality mesh pattern in a wristwatch band, by forming the collapsing die in such a manner that a plurality of coiled wire materials are combined together and are fabricated by electrical discharge machining with the use of a pattern plate as an electrode. CONSTITUTION:A plurality of coils 5, 6 which are formed by winding thin wires differently in left and right directions, are alternately combined together and are subjected to a compression work from the top and bottom, and both sides of them after pins 7 are connected to the biting sections thereof, thereby a pattern plate 8 for wristwatch bands is formed. A die material is subjected to electric discharge machining with the use of the pattern plate 8 as an electrode, so that a collapsing die is fabricated to form a mesh pattern. With this collapsing dies a press working is carried out to form a high quality mesh pattern in a wristwatch band.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a press crushing mold for patterning the surface of a wrist watch band.

Recently, there has been a strong demand for wristwatches to not only pursue precision but also to increase their value as decorative items. For this reason, various patterns have been applied to the surface of the band, as typified by mesh bands, and variations have been diversified. At the same time, the decorativeness has been improved.

In the case of high-priced items made from precious metals, the pattern is often carved directly onto the band surface by hand engraving, but in the case of other materials such as nickel silver or stainless steel, the pattern is created by crushing with a high-pressure press. However, it is extremely difficult to create a three-dimensional knitting pattern in which the wires are intertwined in a press.

Regarding an example of the conventional knitting pattern processing method for crushed molds, the first
The explanation will be based on Figures (A), (B), and Figures 2 (A), (B), and (C). Figure 1 (A) is a plan view of a crushed type with a herringbone pattern processed by Ingre carving, and Figure 1 (B). ) is an enlarged plan view of the vicinity of the outline.

Figure 2 (A) is a conventional type with a mesh band of 130-k.
It is an enlarged view of the main part of the herringbone pattern pressed with a pressure of 9/m11, and the same figures (B) and (C) are enlarged cross-sectional views of the pattern.

The problem here is that when the original pattern is created by mechanical processing as shown in Figures 1 and 2, the pattern is patterned at a constant pitch P, and as shown in Figure 1 (B), the pattern is patterned with a constant pitch P. It is quite difficult to process the herringbone pattern while changing the pitch P and angle θ according to the external curve, so the pattern does not match the change in the external shape of the band, and the pattern 2 on both sides is cut off in the middle. Unfortunately, I am unsatisfied with the design.

Also, because the patterns are limited to simple ones due to processing technology issues, the patterns pressed using this mold do not intertwine with each other as shown in Figure 2 (A), and are widely separated as shown in Figure 3. .

Furthermore, as shown in Figure 2 (B) and (C), the depth of the pattern is 50μ.
It is shallow, flat, and has no three-dimensional feel, and does not have the delicate pattern that is unique to knitted wire. In addition to the processing examples described above, braided pattern processing has been attempted in metal etching, milling, and the like, but all of them had the same drawbacks as the above examples.

The present invention was made in view of these problems, and is aimed at processing a coil shape similar to an actual braided wire band into a three-dimensional crushed pattern.

For this reason, the present invention is a method in which a band blank serving as a pattern prototype is manufactured using a wire rod that can be used as an electrode material, and a pattern is formed on a crushed mold by electrical discharge machining using this as an electrode.
This makes it possible to create an excellent knitting pattern that overcomes the drawbacks of the conventional method.

The method of the present invention will be explained below with reference to the drawings and examples.

FIG. 3 is an enlarged view of the structure of the herringbone band. Needless to explain in detail here, the structure of the herringbone band consists of alternating left and right coils 5 and 6 with different winding directions to form a meshing part. After connecting the parts through pins 7, compression processing is performed from the top, bottom and side surfaces to form a band shape.

FIG. 4(A) is a plan view of a pattern prototype of a herringbone band made by the method shown in FIG. 3, and FIG. 4(B) is an enlarged plan view of the vicinity along the external curve.

Comparing with Fig. 1 (B), the outer shape of the band is formed by compression from the upper, lower and side surfaces, and at the same time the stitch angle θ,
changes sequentially along the outer shape, and θ. Although there is a slight pitch change, since the stitch pattern is aligned along the outer shape, a good quality appearance can be obtained, and a three-dimensional effect that cannot be obtained by machining can be obtained.

These prototypes of herringbone band patterns are woven in advance with wire rods of copper, brass, silver, etc. to serve as electrode materials, and the patterns are molded three-dimensionally into molds by electric discharge machining using these pattern prototypes as electrode materials. Transfer is possible.

FIGS. 5(A), (B), and (C) show a partial plan view and a cross-sectional view of a watch band with a crushed pattern obtained by the crushing mold using the pattern prototype as an electrode as described above. As shown in Fig. 5 (A), compared to the conventional example Fig. 2 (A.), the pattern is denser, and as shown in Fig. 5 (B) and (C), the unevenness has a cross section that looks like knitted fine lines. The quality is much better than the conventional example, with a three-dimensional effect, and the part that follows the external curve is not cut along the external curve like the conventional example, just like the mold. Since the stitch patterns are aligned, a watch band with good appearance quality can be obtained.

FIG. 4 is a perspective view of the discharge electrode of the present invention. To explain the electrode and pattern processing method, the pattern prototype 8 is shown in FIG. It was manufactured using the same processing method and molded into the same profile as the crushing mold, and the electrode base material 9 was soldered or conductive adhesive to provide complete conduction between the two and firmly bonded to form a discharge electrode.

Further, the electrode base material is provided with machining fluid injection ports 11 and 1.0 for spouting machining fluid from inside and sufficiently removing machining powder.
A countless number of 0 p mu ejection holes 12 are provided.

Using this electrode, 0. Electrical discharge machining is performed to a depth of 2 mm, a herringbone pattern is formed, and a crushing mold is manufactured.

As described above, in the present invention, a pattern prototype is manufactured in the same way as an actual band, and the pattern is formed directly from the pattern into a mold, so delicate patterns unique to knitted wire can be created, and press processing can be applied to the actual band. It is possible to provide a pattern with a design similar to that of the knitted wire band.

Under these circumstances, the value of the present invention is great, and it can be applied to cases, clasps, bracelets, etc., regardless of the pattern on the watch band.Although the embodiment of the present invention has a herringbone pattern, it can be applied to various woven patterns. Needless to say, it is a technology that can be widely applied to diversification of knitting designs using line patterns, patterned wire rods, irregularly shaped wire rods, and combination patterns of chains.

[Brief explanation of drawings]

Fig. 1 (A) is a plan view of a crushed mold with conventional pattern processing;
Figure 1 (B) is an enlarged plan view showing the vicinity of the outer shape, Figure 2 (A
) is an enlarged view of the main part of the herringbone pattern pressed by the conventional type, (B) is the cross section of Ei', and (C) is the Rollo' cross section.
An enlarged sectional view showing a cross section, and FIG. 3 is an enlarged structural view of a herringbone band connected with a pin. FIG. 4(A) is a plan view of a crushing type according to the present invention, and FIG. 4(B) is an enlarged plan view showing the vicinity of the outer shape. FIG. 5(A) is an enlarged view of the main part of the herringbone pattern of the present invention;
13) Figure (C) is an enlarged sectional view showing a Ha-ha' cross section and a knee-knee cross section, respectively, and FIG. 6 is an explanatory view showing the electrode structure. 5, 6... Coil, 7... Pin, 8.
... Pattern prototype, 9... Electrode base material.

Claims (1)

[Claims] In a crushing mold that creates a knitting pattern on the surface of a watch band by crushing, thin wire material such as copper, brass, or silver is formed into a coil shape, and multiple coils are combined to create a prototype pattern for a knitted watch band. A method for manufacturing a crush mold for a watch band, characterized in that a crush pattern is formed by electric discharge machining using the watch band pattern model as an electrode.