JPS5861296A - External parts for watch - Google Patents

Abstract

PURPOSE:To obtain external parts for a watch having superior corrosion resistance and presenting the fine appearance of stripe by striped on plating formed on a metallic surface and forming gold plating, gold alloy plating or white plating on the scored plating. CONSTITUTION:Plating of Ni, Ni-Pd or the like is formed on press-molded external parts for a watch, and the plating is striped, Golden finish-plating of gold or a gold alloy or a white finish-plating of Pd or a pd alloy is then formed on the striped plating. Since the base has a mirror surface, the under-plating has high covering power and pinholes, etc. are hardly produced as compared to conventional external parts for a watch obtd. by forming plating on the scored base. Accordingly, external parts for a watch with extremely superior corrosion resistance are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exterior part for a timepiece that has improved corrosion resistance on a striated surface.

Conventional exterior parts with a striped finish are constructed by applying base plating on a striped metal material such as copper, brass, or nickel silver copper, and then performing a plating process such as finish plating.

An example of the manufacturing method will be explained in detail with reference to FIG.

FIG. 1 is a sectional view of a conventional lined watch case.

The manufacturing method is to perform processing such as forging, press molding, and cutting on a brass material 1, and to form the case into a watch case in advance. After applying a line pattern to the surface of the case, which has been molded to the zero order, a nickel film is applied to the watch case. Next, after activating the above nickel film, coat it with a gold-silver (12 to 16 currant) film 3 of about 3 microns, and then coat it with a gold-nickel (about 22 karat) film 4 of about 2 microns. Then, a striped watch case is manufactured.

In this case, if the plating coverage of each part of the line was poor, pinholes etc. would occur, from which corrosion would occur, resulting in inferior corrosion resistance compared to a mirror finish. Furthermore, if the thickness of the plating film is increased in order to improve corrosion resistance, there is a drawback that the original beauty of the streaks is lost.

Therefore, the present inventor has developed a watch in view of the above-mentioned drawbacks, and as a result, it is an object of the present inventor to provide a new exterior part for a watch that has excellent corrosion resistance and takes advantage of the aesthetic appearance of the streaks.

That is, the present invention provides press-molded watch exterior parts (nickel, nickel-phosphorus, nickel-phosphorus films) I#-
After plating with tin, etc., this plating is processed with streaks to create gold, gold alloys, palladium, palladium alloys, rhodium, and platinum.

By applying a finishing plating such as chrome, we succeeded in obtaining a watch exterior part with a streaky finish that has excellent corrosion resistance. Compared to conventional watch exterior parts in which the fabric is lined and plated, in the case of the present invention, the fabric has a mirror surface, so the coverage of the base plating is good and there are almost no pinholes or the like. Therefore, the corrosion resistance is very good.

The present invention will be explained below with reference to Examples.

Brass fabric 1 molded into a watch case as shown in Fig. 2
The nickel film 2 is coated with a thickness of about 10 µm, and a line pattern is applied to the nickel film 2. After activating the nickel film with rough stripes, a gold-silver (12-16 karat) film 3,
Furthermore, a gold-nickel grain finish watch case was obtained.

When this watch case was tested for corrosion resistance using artificial sweat immersion tests and salt spray tests, it showed extremely superior results compared to conventional striped finish products.

Example 2: German silver fabric 5 molded into a watch bezel as shown in Figure 3
A nickel-phosphorus film 6 of about 5 to 10 microns is coated on the surface of the film, and a line pattern is applied to the film. Furthermore, after activating the nickel-phosphorous film, 2 to 3 layers of palladium nickel film 7 are added.
An exterior part for a watch with a streaky finish was obtained by applying a coating of about 40%.

When the corrosion resistance of this watch bezel was investigated through an artificial sweat immersion test and a salt spray test, it showed very superior results compared to conventional striped finish products.

As described above, according to the present invention, compared to conventional streak-finished watch exterior parts, pinholes and the like are hardly observed, and therefore corrosion resistance is improved and the original beauty of the streaks can be maintained. Furthermore, since there is almost no change in the process, there are advantages such as the fact that the equipment used in the past can be used as is.

In addition, according to the present invention, other metal materials may be used instead of brass and nickel silver, and nickel, nickel-cobalt, copper-tin, etc. may be used instead of nickel, nickel-phosphorus, etc., instead of those described in the embodiments. It is also possible to use gold, palladium, rhodium, platinum, chromium, or other plating instead of the alloy or palladium-nickel film.

The present invention also provides a dial, a watch case, and a bezel.

It can be widely applied not only to external watch parts such as bands, but also to decorative items.

[Brief explanation of the drawing]

Figure 1 shows an example of conventional watch exterior parts, Figures 2 and 3
The figure shows an example of an embodiment of an exterior part for a timepiece according to the present invention. 1... Brass fabric watch case 2... Nickel film 3... Gold-silver film 4... Gold-nickel film 5... Nickel silver watch bezel 6... Nickel-phosphorus film 7... Palladium-nickel film or above Applicant Daini Seikosha Co., Ltd. Agent Patent attorney Mogami Mogami Figure 1 Figure 2 Figure 3 figure

Claims (1)

[Claims] Exterior parts for watches, which are made by plating a metal surface, adding stripes to the surface, and then applying desired gold plating, gold alloy plating, white plating, etc.