JPS60141868A - External parts for watch - Google Patents

Abstract

PURPOSE:To obtain external parts having high scratch resistance by mechanically working a blank, forming a hard plated nickel layer of a specified thickness contg. phosphorus, and coating the nickel layer with a silver-white titanium carbide film by ion plating. CONSTITUTION:A blank of stainless steel, German silver, a Cu alloy or the like is mechanically worked by forging, blanking, turning, grinding or other method, and a hardened plated nickel layer of 10-200mum thickness contg. phosphorus is formed on the surface of each worked body. The nickel layer is then coated with a silver-white film consisting of titanium carbide and titanium oxide by ion plating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a surface treatment structure for an exterior part for a timepiece such as a wristwatch.

[Prior art]

Conventionally, the scratch-proof side has been made of extremely hard cemented carbide, which is made by appropriately blending carbide powders such as tungsten, titanium, and tantalum with tough metal powders such as cobalt. It's here.

These cemented carbides have a Vickers hardness of 1000 to 18
It has a hardness of 0.00 and has the advantage that when used as a watch side, it will not get scratched even if it is carried for a long time, and the original metallic luster of the cell phone can be preserved forever [7]
ing. On the other hand, its workability is extremely poor, and other than turning after pre-sintering, it can only be machined by electrical discharge machining, whetstone grinding, surface lapping, etc., and since it is a difficult-to-process material, the processing cost is extremely high for watches. It has the disadvantage of being expensive. In addition, in the process of turning after preliminary sintering and final sintering, it was not possible to guarantee the accuracy of the sand due to shrinkage during the final sintering.

A further disadvantage of cemented carbides is that they have poor impact resistance properties. This is a very serious problem for the watch material, as cemented carbide watches easily break when dropped to the floor or are subjected to severe impact, especially if the content of tough binders such as the aforementioned cobalt is low. Can be mentioned.

On the other hand, the silk side of wristwatches made of stainless steel such as 18-8 series or 1B-12 series, or copper alloys such as brass and nickel silver, are coated with at least one layer of nickel, baladium, rhodium, or chromium. For sides plated to a micron thickness, the surface hardness can only be expected to be around 150 to 600 on the Vickers scale, and stainless steel complexes and copper alloys are excellent for machining, such as forging, punching, or turning, but have low hardness. Because of this, it may get scratched while being carried for a long period of time.
The reality is that it is vulnerable to scratches.

〔the purpose〕

The present invention eliminates these drawbacks.

In other words, while maintaining the workability of stainless steel and copper alloy, it achieves the surface hardness of cemented carbide, prevents scratches on the wrist side, and prevents impact cracking, which is the fate of scratch-proof cemented carbide alloys. The goal is to eradicate the problem.

〔overview〕

In the present invention, the side made of stainless steel or a copper alloy such as brass or nickel silver, or an exterior part for a wristwatch such as a band, is subjected to mechanical processing such as forging, punching, turning, or grinding. After that, a hard nickel plating layer containing phosphorus is formed into a 10 to 200 micron shape, and its two sides are coated with a silvery-white film of titanium carbide using an ion blasting method to eliminate scratches. This realizes an exterior part that can be locked.

〔Example〕

To explain an example of applying 18-8 stainless steel to a wristwatch, the surface hardness of the plating layer containing phosphorus is about 550 Vickers hardness due to 100 micron hypophosphorous acid reduction nickel plating, and then titanium carbide is applied. Approximately 1 micron ion blating was performed.

[Sprout]

Application of voltage during ion blating, evaporation of titanium,
Heat is generated by ionization, and the workpiece has the same effect as heat treatment at exactly 400℃ for about 1 hour, and a Vickers hardness of about 1000 is obtained at a load of 25 grams and a load of 1300.1 kilograms, and the wall surface The results were as expected, with no scratches even when rubbed or bumped against the floor, and no marks or cracks when dropped on the floor. If the thickness of the nickel/phosphorus plating is less than 10 microns, it is effective for applying small loads, but
It cannot withstand shocks such as drops or localized high pressure. In addition, when the thickness exceeds 200 microns, the plating thickness is considerably different between the flat part and the sharp part, causing problems in shape and size, which poses a practical problem. Depending on the ion blating conditions, it is possible to finish the golden ring luster on the titanium carbide surface to a bright copper color, finish it in a dark color, and adjust the color tone. Be sure to sharply polish the fabric base material and lightly wrap it after nickel and phosphorus plating.
By adjusting the ion brating color tone to match the tungsten carbide polished surface, you can obtain a watch exterior that is practically scratch resistant and has the same quality as a carbide case. In addition, the material can be selected from metals with good workability such as stainless steel and copper alloy, which is 50% cheaper than solid cemented carbide cases.
We were able to achieve significant cost reductions. The present invention is applicable not only to wristwatches but also to other wristwatch exterior parts such as a wristwatch band 5-, or decorative items.

Applicant: Co., Ltd. @Koseikosha Patent Attorney, Patent Attorney: Tsumugi Mogami 6- Procedural amendment (spontaneous) 1042/1982 Patent Application No. 251601, filed in 1982, 2, title of invention: exterior parts for watches 3, amendment Person 4, Agent Address: 6-21 Kyobashi 2-chome, Chuo-ku, Tokyo 104, Matabe Seiko Co., Ltd. Mogami Patent Office 5, Number of inventions increased by amendment 6, Procedures subject to amendment (voluntary) 1. Amend the claims as shown in the attached sheet.

2. In the third line of page 4 of the specification, the phrase "silver white color of titanium carbide" is corrected to "silver white color consisting of a mixed layer of titanium carbide and titanium oxide."

3. On page 4, line 11 of the specification, the phrase "titanium carbide" is corrected to "a mixed layer of titanium carbide and titanium oxide."

4. From the second line to the last line from the bottom of page 4 of the specification, the phrase ``Even if it rubs or bumps'' should be corrected to ``Even if it rubs or bumps.''

5. On page 5 of the specification, line 3, the phrase "small hit" should be amended to "small hit".

6. The phrase "titanium carbide surface" on page 5, line 9 of the specification has been changed to "titanium carbide, which is made of metal, containing phosphorus and having a hardened nickel plating layer of 10 to 200 microns on the surface."
An exterior part for a watch, the upper surface of which is coated with an ion-blated silvery white film.

Claims (1)

[Claims] A watch comprising a metal plated with a hardened nickel plating layer containing phosphorus of 10 to 200 microns on its surface, the top surface of which is coated with a silvery-white coating of titanium carbide using an ion-blating method. Exterior parts.