JPS6049266B2 - How to make needles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a three-dimensional needle having a tire-cut appearance.

Conventionally, there have been two types of tire cutting needles, such as a flat cut needle (a) and a mountain cut needle (a), as shown in FIG. When diamond-cutting such a needle, it is common practice to fix the needle to a face plate or the like, and then diamond-cut the entire upper surface of the needle, including the seat portion 1. However, as shown in Fig. 2, when processing a needle whose upper surface 2 and slope 3 are mirror-finished, when the slope 3 is finished with a diamond cut, the slope 3 is not a uniform plane, and the slope 3 is not flat. It was impossible to finish the slope 3 with a diamond cut because the extension would immediately hit the seat part 1.

In addition, there is a method of finishing the slope 3 to a mirror surface by para-polishing, etc., but this is difficult for the same reasons as mentioned above, and even if it were possible, only a needle with poor polishing quality could be obtained.

The present invention seeks to provide a novel method for manufacturing needles that solves the above problems.

The manufacturing method of the present invention will be explained with reference to FIG.

The needle 4 is made into a blank with a □-shaped cross section with a cutting allowance left in the conventional manner, and then a flat diamond cut is made on the upper surface (it becomes exactly as shown in Figure 1a).

After that, as shown in FIG. 4, the needle 4 is placed so that the diamond-cut surface of the needle 4 is aligned with the die, which is three-dimensionally composed of split molds 5, 6, and 7 whose surfaces are mirror-finished. Set a die in an air press or the like to make the seat part 1 strong and press it with a flat punch 8.

Since the upper surface 9 of the needle 4 has been cut with a flat diamond in advance, a high-quality needle with a convex cross-section having a three-dimensional diamond-cut upper surface and an inclined surface is produced.

The needle shown in FIG. 4 is another example of a needle treated by the manufacturing method of the present invention, in which the upper surface of the dozen divided molds 6 in FIG. Because it is finished, the slope 10 is the tire cut surface and the upper surface 11
You can also create new designs of hands with a matte surface.

As described above, according to the processing method of the present invention, it is possible to produce a needle having a three-dimensional diamond cut surface, which could not be achieved using conventional processing methods, and it is possible to create a novel expression in terms of design.

Moreover, as recent watches have become thinner, the hands themselves have also become thinner, with a thickness of about 0.1 Twt.

If the manufacturing method according to the present invention is applied to such thin needles, a luxurious three-dimensional expression can be obtained even though the needles are thin, and the effect of the invention is extremely large.

[Brief explanation of drawings]

Figures 1A and b are a plan view and a sectional view of a needle formed by the conventional processing method, Figure 2 is a plan view and a sectional view of a needle formed by the processing method of the present invention, and Figure 3 is a plan view and a sectional view of a needle formed by the processing method of the present invention. FIG. 4 is a plan view and a cross-sectional view of a needle molded with the mold shown in FIG. 3. 1... part of the seat, 2... upper surface, 3...
...Slope, 4...Needle, 8...Punch.

Claims (1)

[Claims] 1. A flat or curved diamond cut is made on the upper surface of the needle flank, and then the diamond cut surface is stamped with a mold whose part or the entire surface is a mirror surface to reveal a three-dimensional diamond cut surface. A method for manufacturing needles.