JPS6071247A - Sheathed part for watch - 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 The present invention relates to an exterior part for a timepiece that is made of a porous metal and a composite material in which dissimilar metals are integrated under high temperature and high pressure.

Traditionally, exterior parts for watches have been made of stainless steel, brass, or nickel platinum-based materials, with various plating applied as necessary, and some materials have also been made of cemented carbide, titanium, or plastic. It is used.

On the other hand, looking at recent market trends, there is a growing trend towards smaller and thinner products, as well as a strong tendency to desire items with higher decorative effects, which is why we are developing new materials that cannot be expressed using conventional metals. is desired.

However, at present, stainless steel, brass, and nickel silver, which are the most commonly used watch cases, are plated, but from a decorative point of view, the combination of a mirror surface and streaks and the plating finish are poor. There are variations and very limited means of decoration, which cannot satisfy the demands of consumers. Furthermore, even though carbide, titanium, and titanium alloys are used in some parts, they are only used as single metals, and have reached their limits in terms of decorativeness.

The present invention was made in view of the above drawbacks, and while taking advantage of the advantages of the single metals that have been used in the past, it is possible to manufacture new metals that are composite and integrated. We succeeded in obtaining exterior parts with a rich variety of designs that were previously unobtainable.

The purpose of the present invention is to integrate composite materials of dissimilar metals in an arbitrary pattern, which is difficult to manufacture using various manufacturing methods including conventional melting methods, and in particular, to integrate materials with different melting points. It consists in creating a single composite material.

Next, metals used in the present invention will be described. Representative materials include stainless steel, titanium, aluminum, brass, and nickel silver.

and various types of steel and non-ferrous metals. Various precious metal alloys, including gold, silver, etc. Furthermore, it refers to cemented carbide, etc., and the combination can be changed arbitrarily depending on the purpose and use.

Also, regarding making metal porous, various types of precision punching,
Mechanical, chemical, thermal, etc. methods such as chemical etching, electroforming, sintering, sponge alloy, etc. may be used, and the method is not particularly limited.

Next, when talking about static isotropic high temperature and high pressure processing, first of all, liquid or gaseous gold is used as the pressure medium to apply pressure without directionality, and when this is loaded with temperature, the synergistic effect It's even more effective. Although it depends on the temperature used, it is effective to use an inert gas such as Ar gas or N2 gas as the pressure medium.

A pressure of several 100 kii/ai or more, preferably several 1000*/- or more is effective. Although it is possible to use less than this, it is not practical as it would take a long time. Also, the temperature varies depending on the metal used on both sides, but
Generally, it is most effective to carry out the process just before the recrystallization temperature.The present invention will now be described in detail with reference to Examples.

Example-1 Electroless Ni plating was applied to a sponge in advance, and then only the sponge was melted to create a sponge metal with a thickness of 1m/TrL.Both sides of the sponge metal with a thickness of 1TfL/m were covered with two gold plates of 1TfL/m as shown in Figure 1 (a). Afterwards, the periphery is shielded and inserted into a high-pressure container, and the temperature is raised while Ar gas is supplied.

When the temperature reached 980℃ and the pressure reached 9f/cd, it was held for 2 hours. ・After that, the temperature was lowered to room temperature and pressure, and then taken out from the furnace. In this way, static isotropic high temperature and high pressure treatment was carried out. As shown in Figure 1(b), the metal plates on both sides completely penetrated into the porous sponge metal, and the Ni
and Au were integrated. The resulting composite material cannot be manufactured using conventional melting methods, and the exterior parts made using this material have become attractive, high-quality products that cannot be obtained using conventional methods. Moreover, not only the decorative effect but also the functional properties such as corrosion resistance were sufficiently satisfactory as an exterior part for a watch. Furthermore, similar results could be obtained by using a porous stainless steel plate instead of the Ni sponge metal.

Example 2 A titanium plate with a thickness of 171/771 mm is used to precisely punch out the pattern shown in (aL (b) in Figure 2).Next, a 2 nL/771 thick titanium plate is prepared, As in Example 1, a porous titanium plate is sandwiched, the periphery is shielded, and the plate is inserted into a high-pressure container.

After that, the temperature was raised to 750°C while flowing Ar gas.
After the pressure reached 1400 kpf/cdK, it was held for 1.5 hours and then returned to normal temperature and pressure.

The composite material thus completed was sliced in half from the titanium part, resulting in a completely new exterior part that could not be produced conventionally, with the warm silver alloy completely penetrating the porous part of the titanium.

Example 6 A porous material was made in advance into the patterns shown in FIGS. 3(a) and 3(b) using a powder metallurgy method. Both sides of a 2 m/m thick plate of tungsten carbide cemented carbide were prepared in the same manner as in Example-1.
@ / @ Hold it with a thick metal plate and insert it into a high-pressure container after shielding the surrounding area. Thereafter, the temperature was raised while flowing %N2 gas, and when the temperature reached 1000° C. and the pressure reached 9 f/cd, the temperature was maintained for 6 hours, and then the temperature was returned to normal temperature and pressure.

In this way, the exterior parts processed from a composite material with gold completely permeated into the porous carbide part have a high decorative effect that cannot be obtained with conventional methods, with the golden color harmonizing with the glittering carbide part. It became a product.

Although typical metal or porous manufacturing methods have been described in the examples above, similar effects can be obtained by using metals or porous manufacturing methods other than those in the examples. In addition, although only the exterior parts for watches have been described in the examples, the same effect can be obtained when used in cases for lighters, electric razors, fountain pens, etc., or accessories such as tie pins, cufflinks, necklaces, etc. I can do it.

[Brief explanation of the drawing]

FIG. 1 (LL) is a cross-sectional view showing a structure in which porous metal and dissimilar metals are combined according to the present invention. (b) is a cross-sectional view of the composite material after high temperature and high pressure treatment. Figure 2 (a), (b) and Figure 3 ('')1, (b)
2A and 2B are plan views showing representative examples of porous metals according to the present invention, respectively. 1: Impregnated metal 2: Porous metal and above Applicant: Suwa Seikosha Co., Ltd. Representative patent attorney
Mogami Tsumugi Grain Diagram (OL) (shi) (b> (shi)

Claims (1)

[Claims] A porous metal plate is sandwiched between two metals of a different material from the metal plate, and then subjected to static isotropic high-temperature and high-pressure treatment, thereby integrating the metal and the dissimilar metal. Exterior parts for watches.