JPS61594A - Manufacturing method for exterior parts for watches - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing an exterior part for a timepiece such as a wristwatch that is finished with black Rh plating, black Ru metal plating, or black Ar plating.

[Prior art]

Conventionally, black plating, such as black rhodium plating, has been frequently used for eyeglass frames, ornaments, etc., taking advantage of its unique color tone. However, all of these platings have poor wear resistance, and in order to be used for the exterior parts of watches, decorations are applied after plating, or they are only used partially on concave parts that will not wear out while being carried. was an exception.

〔the purpose〕

The present invention aims to eliminate these drawbacks and provide a high-quality exterior part for a watch with black paint.

〔overview〕

In the manufacturing method of the present invention, the material is first given a satin finish with roughness in the range of #80 to #500 by honing or the like.

Next, the hardness is HV 250 or higher (preferably HV 500)
Above) Rh, , Rw, Pd, Or,
(+(1, Ni, Cu, etc. plating or alloy plating based on these at least 174 or more, 10
Apply less than μ.

After completing these base treatments, apply black rhodium.

7% R? /, plating, or black Cr plating.

FIG. 1 is a cross-sectional view of a black-plated case according to the present invention. 1 base plate, 2I- base plating, 3
1'' is black plating.It also shows the concave part of the α-matte finish and the convex part.In order to prevent wear of the black plating shown in important point 3 of the present invention, material 1 is used. The purpose is to process it with satin finish.

If the black-plated surface has a matte finish, the contact area with the surface that is subject to wear during carrying is small. In other words, the 0 part of the satin finish is not worn away and the blackish plating remains, so the appearance is not significantly impaired compared to the same treatment for a mirror finish.

The next important point is to prevent the b part of the matte finish from wearing out and the abraded surface to 0 parts, under the black plating, at least HV 250 or higher (preferably HV1!).
500 or more) shown in Figure 2.

The Metsu+ layer shown in 2 does not need to be limited to one layer, and depending on the case, different types can be used as second or third layers. However, it is preferable that the total thickness of the sag is 10 μm or less so that the unevenness of the satin finish is not leveled by plating.

Hereinafter, the present invention will be described in detail based on examples.

Example 1 The bare surface of a watch case made of stainless steel was honed with #320 glass beads, fC6, and then the surface was subjected to appropriate pretreatment, and then Rh of 1.0μ was applied.
Plating was applied, and finally black Or plating was applied to a thickness of 3.0μ.

The quality of the black watch case obtained in this way is determined by performing an abrasion resistance test by applying a load of 500g on cowhide and rubbing the case edge 30,000 times with a stroke of approximately 5m, and visually observing the worn surface. As a result, the quality was good and the initial appearance had not changed.

Example 2 The surface of a watch case made of copper alloy was coated with glass beads #
I honed it with 240. Next, after an appropriate pretreatment, the surface was plated with 2 μm of N, and then plated with pd-N? : Alloy plating was applied, and finally black Rh plating was applied to 10μ.

The quality of the black wristwatch case thus obtained was good in the same abrasion resistance test as in Example 1.

In addition, the watch case is made of stainless steel.

Direct point CR plating without the treatment of the present invention is black Rh.

Regarding the quality of plated products, in a comparable wear resistance test, the stainless steel material on the worn surface was exposed, significantly damaging the initial appearance, and the effect of the surface treatment of the present invention was extremely poor. [Effects] As described above, according to the present invention, high-quality black exterior parts for wristwatches can be manufactured, which will greatly expand the design of wristwatch exteriors in the future. This is something that contributes greatly.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a watch case coated with black plating according to the present invention. 1...Base 2...Base plating 5...Black plating 4...Honing recess 5...Honing recess and above

Claims (1)

[Claims] As a base treatment, the material is given a satin finish, and furthermore, Rh, Ru, Pd, A having a hardness of at least HV250 or higher is applied.
At least one layer of plating such as u, Cr, Co, Ni, Cu, or alloy plating based on these 10
1. A method for manufacturing an exterior part for a watch, characterized in that the outer parts are coated with a plating of less than .mu.m and then plated with black Rh plating, black Ru plating, or black Cr plating.