JPH0669406B2 - Part fitting method for decorative parts such as watches - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of fitting parts for decorative parts such as watches, and more particularly, it has a large number of parts such as a block band piece of a wristwatch and a complicated shape of parts. It is applied to the effective fitting between decorative parts with severe requirements such as corrosion resistance and tensile strength.

[Conventional technology]

The conventional method for engaging and connecting block band pieces of wristwatches is
As shown in Figs. 3 and 4, the concave-convex portion 3 of the block-shaped block piece 31
A coupling member 32 such as a coupling pin or a coupling screw is engaged with and coupled to an engagement hole 31b formed in the side surface direction of 1a. Also,
The engagement between the band piece 31 and the case 33 is C as shown in Figs.
It was common to make the connection by engagement of the ring 34 and the connecting pin 35.

[Problems to be Solved by the Invention]

In the case of the prior art as described above, separate parts are required for fitting parts to each other, and the parts to be fitted also require engagement holes, which requires a lot of processing man-hours. In this case, one watch uses 20 to 40 pieces, which is very expensive. In the conventional example shown in FIG. 3 and FIG. 4, the Muku-shaped block piece is made of stainless steel, titanium / titanium alloy, or the like, and the deformed wire obtained by cold casting, hot casting or drawing is shaped by milling or the like. It was formed and drilled one by one as a post-process. Similarly, for the case 33, after the casting process, the shape is formed by cutting, and finally the connecting pin 35 is drilled.
The hole 33b for inserting was drilled. The parts also required connecting members 32 or 34, 35 such as connecting pins and connecting screws between the band piece and the band piece and the case, which resulted in a large number of parts and a high cost.

In order to eliminate the above-mentioned drawbacks, the present invention improves the material, processing method, and fitting method of the Muku block piece to maintain the required quality as a wristwatch band and to reduce the cost by about 50% of the conventional one. It is intended for.

[Means for Solving the Problems]

In order to solve the above-mentioned problems of the related art, the present invention combines a method for fitting a decorative component such as a wrist watch with a new processing technology and a fitting structure to provide a separate member for fitting a component to another. It eliminates the need for a connecting member.The material of the muk block is squeezed into titanium-based metal and stainless-based metal, and the processing method is molding and sintering from both metal powders by metal injection molding, and the relative density is 94% or more. And the engaging parts such as uneven parts are formed on each other, and the engaging parts such as the uneven parts are brought into contact with each other to engage and connect the two, and the caulking fitting is performed. By deforming and engaging and connecting by shape memory effect fitting, connecting members such as connecting pins and connecting screws and drilling are not required for both fittings, and significant cost reduction can be realized. It is a thing.

〔Example〕

The present invention will be described in more detail with reference to Examples. In FIG. 1, reference numeral 1 is a block block piece, which is made of a highly corrosion-resistant material, one of which is a titanium-based metal and the other of which is a stainless-based metal. Titanium is a pure titanium or titanium alloy (Ti-Ni, Ti-Al-V, Ti-V-Cr-Al, etc.) composition with a particle size of 15μ or less formed by metal injection molding and sintering, Relative density tested at 90-97%. In the case of stainless steel, SU, which has a particularly high corrosion resistance among austenate stainless steels
In the composition of S316L, SUS304, etc., C ≦ in terms of corrosion resistance and specularity.
It is preferable to set 0.06% and O ≦ 0.2%. Further, ferritic stainless steel such as precipitation hardening type of SUS444 series or Fe-Cr-Ni-Al series is also possible. The shape of the band piece 1 is uneven, and the connecting pin 1a is integrally formed with the band piece body 1 in the recess. On the convex portion of the band piece 1, an engaging portion 1b protruding downward from the back surface is formed integrally with the main body 1. In FIG. 2, a portion 3b is a cross-sectional shape of the hatched portion after assembling and caulking and fitting, and a two-dot chain line shape without hatching shows a shape before caulking in a molded shape after metal injection molding. In the band piece having this shape, the recess is formed by vertically dividing the mold at the central portion of the connecting bin 1a, and the convex portion is formed by sliding the slide core in both directions in the lateral direction and dividing at the central portion. After molding with this shape by metal injection molding, satin finish is applied by mirror polishing and honing by batch processing such as barrel polishing, and assembled as a completed state. In a state where the pieces of the pieces are assembled, as a band, 10 to 15 pieces are simultaneously pressed and engaged by caulking.

In this configuration, the particle size of the metal powder was trial evaluated from 10 to 50μ, but the best mirror appearance was 15μ or less. Although the relative density after sintering was 90 to 97%, the evaluation was carried out on a trial basis, but it is preferable that the relative density is 94% or more in terms of quality such as mirror appearance and corrosion resistance.

Materials other than the titanium-diameter metal and the stainless steel-based metals of the examples may be Al-based alloys or noble metal-based alloys as long as the corrosion resistance can be secured.

It is reasonable that the case 3 and the band piece 1 are engaged with each other by using the same method, and the lower portion 3b of the convex portion 3a of the case 3 is caulked and engaged by the above-described method.

In any case, when removing, it is possible to insert a screwdriver or the like into the lower clearances 1c and 3c and plastically deform it by a prying method to adjust the length and repair.

When the material is a Ni-Ti alloy, it is possible to carry out fitting similar to the caulking engagement of FIG. 2 by heating and deforming by the shape memory effect.

In FIGS. 1 and 2, the case and the band piece may have a configuration in which the irregularities are completely opposite to each other, and the connecting pin 1a may have a non-circular cross section such as an ellipse other than a circular shape.

〔The invention's effect〕

The present invention achieves the following great effects by the processing method as described above.

Since the connecting members such as connecting pins and the drilling of the pieces as in the past are not required for connecting the pieces, the cost of the conventional method is about 5 to 6
We were able to realize a significant cost reduction.

In terms of quality, the quality required for a watch band, such as corrosion resistance, can be secured at the same level as the conventional quality level.

In terms of design, the side surface of the band piece is different from conventional ones, and there are no holes, and the shape is free.

The effects as described above are useful not only in the band piece of a wristwatch, but also in fitting parts such as bracelets, pendants, etc. that require quality and design / appearance such as corrosion resistance as decorative parts to be worn on the skin. It is versatile and has high practical value.

[Brief description of drawings]

1 is a plan view showing an embodiment of the present invention, FIG. 2 is a partial vertical sectional view showing an AA cross section in FIG. 1, FIG. 3 is a plan view showing a conventional embodiment, and FIG. BB in FIG.
It is a fragmentary longitudinal section showing a section. 1 …… Band piece 1a …… Connecting pin section 1b …… Coupling section 3 …… Case 3a …… Case convex section 3b …… Case engaging section

Continuation of front page (56) Reference JP-A-49-23709 (JP, A) JP-A-53-130074 (JP, A) JP-A-62-290803 (JP, A) JP-A-59-229403 (JP , A) JP 63-223103 (JP, A) JP 63-223102 (JP, A) JP 53-129680 (JP, A) JP 59-85335 (JP, A) JP 57-198202 (JP, A) JP 61-67703 (JP, A) JP 49-128764 (JP, A) Actually open 59-137114 (JP, U) Actual 52-160365 (JP, A) U) Real public Sho 46-3265 (JP, Y2)

Claims (2)

[Claims] 1. Pure titanium or titanium alloy (Ti-Ni, Ti
-Al-V, Ti-V-Cr-Al, etc.) with a metal composition having a concavo-convex shape is molded and sintered from metal powder with a particle size of 15μ or less by metal injection molding, and the relative density is 94% or more. When the two or more parts of the member are engaged with each other, the concavo-convex portions are brought into contact with each other, and they are deformed and fitted by caulking fitting, shape memory effect fitting, etc. Part fitting method for decorative parts. 2. A member having a metal composition of austenitic stainless steel or ferritic stainless steel and having an uneven shape is molded and sintered by metal injection molding from a metal powder having a grain size of 15 μ or less, and has a relative density of 94.
% Or more, and when the two or more parts are engaged with each other, the concavo-convex portions are brought into contact with each other, and are deformed and fitted by caulking fitting, all-round knurling fitting, etc. Part fitting method for decorative parts.