JPH0352765A - Brazing method and plating method - Google Patents

Abstract

PURPOSE:To enhance joint strength and to improve the reliability of brazing strength by sticking film consisting of gold on the surface of a member and brazing a mounting member onto the gold film. CONSTITUTION:The extremely thin gold film 3 is formed on the surface of a temple stock 1 molded of an N-T alloy to a prescribed shape. The thickness of this film 3 is set at about the thickness at which the required joint strength between a hinge part 2 which is the mounting part and the temple stock 1 is attained. The hinge part 2 is formed of German silver, phosphor bronze, etc., and may be formed of the N-T alloy as well. A general brazing material, such as silver solder, is used for brazing the hinge part 2. The hinge part 2 is brazed to the temple stock 1 via the gold film 3 and, therefore, the wettability of the gold film 3 and the brazing material is good and the higher brazing strength is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brazing method and a plating method used, for example, in processing eyeglass parts.

(Prior Art) Conventionally, for example, in the case of a temple of a part for a dildo mirror, a hinge part is brazed to the temple, and decorative plating is applied to the surface of the temple. In particular, recently, attention has been focused on the shape memory properties and superelasticity of nickel-titanium alloys (hereinafter referred to as NT alloys), and temples made of NT alloys are known.

In the case of temples made of such NT alloys, it is difficult to obtain brazing strength, so currently the brazing surface is plated with nickel as a base before the hinge parts are brazed.

That is, as shown in FIGS. 5 and 6, nickel plating 102 is applied to the entire surface of the temple material 100, and then the brazing surface is masked with a mask 101 to peel off the plating film, and the remaining nickel plating 102 is covered with nickel plating 102. The hinge part 103 is brazed.

Next, the temple material 100 with the hinge parts 103 assembled
The entire structure was polished, and as shown in FIG. 7, a thin base strike plating 104 was applied to the entire structure, and a finishing decorative plating 105 was applied thereon.

(Problems to be Solved by the Invention) However, in the case of the above-described conventional technology, the wettability between the nickel plating 102 and the brazing material such as silver solder is poor;
There was a problem in that the brazing material did not sufficiently spread over the brazing surface, resulting in low reliability of brazing strength. Further, since the corrosion resistance of the nickel plating 102 is lower than that of the NT alloy, there is a problem that the nickel plating 102 corrodes and peels off in a corrosion resistance test. This corrosion problem is not limited to NT alloys, but also exists in titanium and titanium alloys.

In addition, conventionally in the brazing process, the temple material 10
Since the brazing base plating applied to the entire surface of the product was peeled off in the process before the decorative plating, there was also the problem that the number of processing steps was large and it was time-consuming.

Therefore, it may be possible to simplify the number of steps by applying finishing decorative plating 105 on top of the nickel plating 102 for the brazing base applied to the surface of the temple material 100, without removing the nickel plating 102 for the brazing base. The plating thickness of the nickel plating 102 was so thick that it could not be used as a base for the decorative plating 105.

That is, the strike plating 104 for the base of the decorative plating 105 serves as an intermediate bonding layer for bonding the temple element +4' 1 0 0 and the decorative plating 105, and is usually heat treated to remove internal residual stress. administered. However, if the plating is thick, residual stress is difficult to remove, which may cause the plating to peel off. Further, if the base plating is thick, there is a problem that the gloss of the finishing decorative plating is poor.

Therefore, it is necessary to use nickel plating 10 for brazing.
It is necessary to remove the nickel plating 102 for brazing and apply a new decorative base plating, but when removing the nickel plating 102 for brazing, the Nitc content in the NT alloy is dissolved due to chemical treatment such as pickling. There was also the problem of pinholes. In order to remove these pinholes, the material is polished before decorative plating, but NT alloys are particularly hard and difficult to polish, making it impossible to completely remove pinholes, resulting in unevenness on the decorative plating surface. .

Further, although nickel plating has conventionally been applied as the base strike plating 104 of the decorative plating 104, nickel plating has not had sufficient corrosion resistance. In order to improve corrosion resistance, it is necessary to increase the thickness of the finishing decorative plating 104, which increases cost. Further, if the film thickness is increased, a problem arises in that cracks occur in the decorative plating 105 when the temple is bent.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to provide a brazing method that can further increase brazing strength.

Another purpose is to make it possible to satisfy the functions of the base plating for brazing and decoration when decorative plating is performed together with brazing, and to remove the base plating for brazing. The purpose is to simplify the processing process by omitting the process and to improve the quality of decorative plating.

(Means for Solving the Problems) In order to achieve the above object, the brazing method of the present invention includes:
The method is characterized in that a gold film is attached to the surface of the member to be mounted, and the mounting member is brazed onto the gold film.

In addition, the plating method of the present invention applies a gold coating of uniform thickness to the surface of the member to be mounted over the brazing surface and decorative surfaces other than the brazing surface of the member to be mounted, as a base for brazing and a base for decorative plating. After attaching the gold coating and brazing the attached member onto the gold coating, decorative plating is applied to the entire gold coating.

In addition, it is preferable that the mounting member to which the above-mentioned brazing method and plating method are used is made of titanium, titanium alloy, or shape memory/superelastic alloy, and the mounting member and the mounting member are eyeglass parts. Effective.

(Function) According to the brazing method of the present invention, since the mounting members are brazed through the gold coating, the gold coating has good wettability with the brazing material, and the brazed parts are firmly joined. .

Furthermore, since the brazing strength is high, the gold coating can be made as thin as possible, and stress within the gold coating can be effectively removed by heat treatment.

It is particularly suitable for alloys with shape memory and superelasticity that are difficult to obtain brazing strength, and is suitable for eyeglass parts where brazing and decorative plating are performed together.

Additionally, since gold has excellent ductility, it absorbs the difference in strain between the base material and decorative plating when bent. This property is ideal as an intermediate layer and can prevent cracking and peeling of decorative plating due to bending, and this advantage is particularly noticeable in superelastic alloys.

(Example) The present invention will be explained below based on the illustrated example. No.l
3 to 3 show the processing steps of a temple as an eyeglass component to which the brazing method and plating method of the present invention are applied. In this embodiment as well, the temple is N
Taking as an example a case where the hinge part is made of an alloy having shape memory and superelasticity such as T alloy, a case where a hinge part is brazed as a member to be attached will be explained.

First, the brazing process for the hinge part 2 is divided into two steps: the process of gold plating the entire temple material 1, and the process of brazing the hinge part 2, as shown in Figures 1 and 2. ing.

The temple material 1 is made of an N-T alloy that has been shaped into a predetermined shape by swaging, pressing, or the like. In the gold plating process, a very thin plating is applied to the entire surface of the temple material 1, and the thickness of the gold coating 3 is approximately 0.5 μm at most in this embodiment. This film thickness is set in consideration of the brazing strength of the hinge part 2, and is set to such an extent that the necessary bonding strength between the hinge part 2 and the temple material 1 can be obtained.

The hinge parts 2 are made of common materials such as nickel silver and phosphor bronze, but may be made of an NT alloy similar to the temple material.

Here, the NT alloy used in the present invention is an intermetallic compound N
In addition to alloys mainly composed of iTi, it also includes old Ti-Fe alloys, Ni-Ti-Cr alloys, Ni-Ti-Cu alloys, etc. in which Ni or a portion of Ti is replaced with Fe, Cr, Cu, etc. .

Furthermore, the shape memory/superelastic alloy is not limited to the NT alloy, but also copper-based shape memory alloys.

In addition, the main structure of the present invention is to braze on the gold coating, and the temple material l is titanium. Common eyeglass frame materials such as titanium alloy, nickel silver, and beryllium copper can be used.

On the other hand, the gold to be plated includes not only pure gold but also gold alloys, and examples of gold alloys include Pd, Ni, and C.
A gold alloy containing u or the like can be used. This gold coating 3
It can be produced by electrolytic plating or chemical plating.

However, the method for producing the gold film is not limited to plating, but may also be other thin film production methods such as vacuum evaporation and sputtering.

On the other hand, for brazing the hinge parts 2, various brazing materials such as general silver solder can be used.

Next, finishing decorative plating is applied to the entire temple material 3 to which the hinge part 2 is brazed. Before this decorative plating step, pickling or the like is performed as a pretreatment to remove the oxide film on the surface of the plating film of the temple material 3. This oxide film is removed by washing with water after degreasing.

Further, before removing the oxide film, heat treatment is performed as necessary to remove residual stress inside the gold film 3. In this embodiment, the plating thickness of the gold coating 3 is set to about 0.5 μm, so that residual stress can be completely eliminated. However, as described above, the thickness of the gold coating 3 is not limited to 0.5 μm.

After removing residual stress and removing the oxide film in this manner, decorative plating 4 is applied. This decorative plating 4 can be of various types, such as white plating, gold plating, or color plating.

In this embodiment, the temple material 1 is inserted through the gold plating film 3.
Since the hinge part 2 is brazed to the top, the gold coating 3 has good wettability with the brazing material, and high brazing strength can be obtained. Therefore, since the gold coating 3 can be made as thin as possible, it can also be used as the base plating for the decorative plating 4, and the decorative plating process can be simplified.

In this embodiment, the brazing and plating of the temple and hinge parts are used as eyeglass parts. Rim 6. Bridge 7 and left and right rims 6.6
It can be applied to brazing and plating various eyeglass parts such as the cross section 8 and the left and right rims 6 and 6.

Moreover, it can be widely applied not only to parts for eyeglasses but also to brazing and plating of various members. For example, the joint between the pedestal and the main body of jewelry such as rings and earrings, watches, and various other machines. Can be used for joints of instruments.

(Effects of the Invention) The present invention has the above-described structure and function, and includes a method in which a gold coating with high wettability with brazing material is attached to a member to be attached, and the member to be attached is brazed on the gold coating. Therefore, the bonding strength can be increased compared to the conventional nickel coating, and the reliability of the brazing strength can be increased.

Furthermore, since high brazing strength can be obtained by providing this gold coating, the thickness of the gold coating can be made as thin as possible, and it can also be used as a base coating for decorative finishing plating. Therefore, the conventional peeling process before decorative plating can be omitted, and the number of processes can be greatly simplified. Furthermore, since there is no peeling process, there is no problem with pinholes on the surface of the material that accompanies the peeling process, resulting in improved finishing quality.

11 Furthermore, since the gold coating is used as the base layer, various effects such as improved corrosion resistance can be obtained.

In particular, if used for brazing shape memory/superelastic alloys, which have been difficult to obtain brazing strength in the past, reliability of brazing strength can be improved. Furthermore, if used for eyeglass parts,
It is possible to improve the reliability of the brazed parts of each component, improve the appearance quality, and realize eyeglasses with excellent properties including shape memory and superelasticity.

[Brief explanation of drawings]

Fig. 1 is a process diagram of the eyeglass temple processing process to which the brazing method and plating method of the present invention are applied, Fig. 2 is an exploded side view showing the temple and hinge parts attachment part, and Fig. 3 is the plating process. FIG. 4 is a schematic perspective view of an eyeglass frame to which the present invention is applied, FIG. FIG. 6 is a reference perspective view of a conventional temple brazing process, and FIG. 7 is an enlarged sectional view of the decorative plating part. Explanation of symbols 1...Temple material 3...Gold coating 2...Hinge bar 4...Decorative plating

Claims (7)

[Claims] (1) A brazing method characterized by depositing a gold film on the surface of a member to be mounted and brazing the mounting member onto the gold film. (2) The brazing method according to claim 1, wherein the member to be attached is made of a shape memory superelastic alloy. (3) The brazing method according to claim 1, wherein the member to be attached is titanium or a titanium alloy. (4) The brazing method according to claim 1, 2 or 3, wherein the attaching member and the attached member are eyeglass parts. (5) A gold coating of uniform thickness is applied to the surface of the component to be attached, covering the brazing surface and decorative surfaces other than the brazing surface of the component to be attached, as a base for brazing and a base for decorative plating. After brazing the parts to be attached to the
A plating method characterized by applying decorative plating to the entire surface. (6) The plating method according to claim 5, wherein the member to be attached is made of a shape memory superelastic alloy. (7) The plating method according to claim 5 or 6, wherein the attaching member and the attached member are eyeglass parts.