JPS59118264A - Production of composite metallic material for ornamental use - Google Patents

Abstract

PURPOSE:To produce a composite metallic material for ornamental use which does not peel in the stage of producing said material by providing an oxidation preventive layer on the activated surface of a core meterial, fitting the core material into a sheath metal provided internally with a brazing material layer and joining both materials by heating. CONSTITUTION:The outside circumferential surface of a core material 1 made of German silver is activated and thereafter a thin Al plating layer 2 is formed as an oxidation preventive layer thereon. An Ag-Cu alloy layer 4 contg. 20% Cu as a brazing material layer is formed on the inside surface of a corrosion resistant alloy steel pipe of Ni-Cr steel or the like as a sheath metal. The core material 1 is inserted into such sheath metallic pipe and after both are heated at 600 deg.C, the two materials are extruded and drawn, whereby a composite metallic wire rod is manufactured. The film 2 is diffused in the layer 4 and is thus annihilated, by which the material 1 maintaining activity is brazed to the sheath metal 3. The composite metallic material for ornamental use which is free from peeling and bulging of the sheath metal is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a decorative composite metal material used for eyeglass frames, watch bands, etc.

Generally, decorative metal materials are required to have excellent mechanical properties such as corrosion resistance and spring properties, and to be lightweight.

In order to satisfy these demands, the core material is made of a metal material such as nickel silver or Ni-Cr alloy, which has excellent mechanical properties such as spring properties, or is made of a metal material such as nickel silver, Ni-Cr alloy, At, At alloy, etc. A so-called composite metal material is widely used in which a metal material with a small specific gravity is used, and a metal material such as a Ni-Cr alloy, a noble metal, or a noble metal alloy, which has excellent corrosion resistance and color, is bonded as the outer sheath metal.

By the way, when manufacturing such a composite metal material, both the core material and the outer metal material or the core material are heated to a predetermined temperature,
After that, a method is adopted in which the core material and the outer sheath metal are joined by a certain method, but when the core material and the outer sheath metal are heated to a predetermined temperature, is oxidized, and as a result, the bonding strength of the oxidized portion is weakened, resulting in peeling or swelling at that portion.

The present invention has been made to eliminate such drawbacks.
A composite metal material for decoration that does not form an oxide film on the bonded surface even when the core material and the outer sheath metal are joined in a heated state, and therefore the outer sheath metal does not peel or swell. The purpose is to provide a manufacturing method.

The method for manufacturing a decorative composite metal material of the present invention is to provide at least one oxidation-preventing film layer 2 on the outer peripheral surface of the activated core material 1 as shown in FIG. Metallic part 3
Since the joint surface with the core material 1, that is, in this example, the sheath metal 3 is made of a pipe, at least one brazing metal layer 4 is similarly provided on the inner peripheral surface thereof, and in this state, the core material 1 and the sheath metal 3 or Only the core material 1 is heated to a predetermined temperature and joined as shown in FIG. 2 to obtain a composite metal material 5.

In this way, on the outer peripheral surface of the core material 1 and the inner peripheral surface of the outer sheath metal 3,
Antioxidant film layer 2. By providing the brazing material layer 4, the outer peripheral surface of the core material 1 is kept active. In addition, since the inner circumferential surface of the outer sheath metal 3 is covered with the brazing material layer 4, when the core material 1 and the outer sheath metal 3 or only the core material 1 are heated to a predetermined temperature and bonded, the oxidation-preventing film layer is 2 diffuses into the brazing material layer 4 and disappears, the core material 1 kept active is brazed, and no oxide film is generated. Therefore, although the bonding strength is high, the outer sheath metal 3 does not peel off or swell. Furthermore, since the core material 1 and the outer sheath metal 3 are joined not directly but indirectly through the oxidation-preventing film layer 2 and the brazing material layer 4, the joining strength is also improved.

Note that if a wet or dry plating method is adopted to provide the anti-oxidation film layer 2 and the brazing material layer 4 on the outer circumferential surface of the core material 1 or the bonding surface of the sheath metal 3 with the core material 1, it will be possible to A layer of desired thickness can be provided evenly and extremely thinly over the entire surface.

Next, in order to clarify the effects of the method for manufacturing a decorative composite metal material of the present invention, specific examples and conventional examples thereof will be described.

[Example 1] Diameter 98I shown in Fig. 1a made of nickel silver with spring properties
An Au layer 2 with a thickness of 2 μm is provided on the outer peripheral surface of the core material 1 of E+1 by a plating method, and the inner diameter is 98.5 m and the outer diameter is 10 mm as shown in FIG.
A 15 μm thick A g -Cu20 Ti alloy layer 4 is provided on the inner peripheral surface of the pipe-shaped outer metal 3 of 511JI by plating, and in this state, the core material 1 is inserted into the pipe-shaped outer metal 3, This was heated at 600° C. for 5 minutes, then extruded and drawn to obtain a composite metal wire 5 as shown in FIG.

[Example 2] A 2 μm thick Au layer was provided by plating on the outer peripheral surface of a core material 1 with a diameter of 98 m as shown in FIG. An Ag-Pd alloy layer with a thickness of 10 μm was provided by a method. On the other hand, the inner diameter 98, as shown in Figure 1, is made of Ni-12 alloy with excellent puncture resistance.
．． An Ag layer 4 having a thickness of 10 μm was provided on the inner circumferential surface of a pipe-shaped jacket metal 3 having a diameter of 5 NJl and an outer diameter of 105 cm by plating. In this state, insert the core material 1 into the pipe-shaped outer metal 3,
This was heated at 500° C. for 3 minutes, then extruded and drawn to obtain a composite metal wire 5 as shown in FIG.

[Conventional example]

A core material with a diameter of 98 m made of nickel silver with spring properties and an inner diameter of 98 m with a diameter of 98 m made of 20% by weight Ni-Cr with corrosion resistance.
8.5IIJ, outside diameter 105 Dragon After inserting it into a pipe-shaped jacket metal, it was heated at 600°C for 5 minutes and extruded.

A composite metal wire was obtained by drawing.

The composite metal wires of Examples 1 and 2 and the conventional example thus obtained were subjected to bending processing.
In the composite metal wire of No. 2, there was no peeling of the outer sheath metal at the bending part, whereas in the conventional composite metal wire, peeling of the outer sheath metal was observed at the bending part. It was done.

Furthermore, when the surfaces of these composite metal wires were observed, no bulging of the outer sheath metal was observed in the composite metal wires of the examples.
In the conventional composite metal wire, bulges were observed in the oxidized parts of the core material and in the outer sheath metal.

The method for manufacturing a decorative composite metal material of the present invention as described in detail above includes the following steps:
Since the oxidation-preventing film layer and the brazing material layer are provided, when the core material and the outer sheath metal are joined in a heated state, the joint surface will not be oxidized and an oxide film will not be formed. Therefore, there is an excellent effect that a decorative composite metal material with high bonding strength and good quality without peeling or blistering of the outer sheath metal can be easily obtained.

[Brief explanation of the drawing]

Fig. 1a is a cross-sectional perspective view showing a core material used in the method for producing a decorative composite metal material of the present invention, and Fig. 1b shows an outer sheath metal used in the method for producing a decorative composite metal material of the present invention. FIG. 2 is a perspective cross-sectional view showing an example of a decorative composite metal wire obtained by the manufacturing method of the present invention. DESCRIPTION OF SYMBOLS 1...Core material, 2...Anti-oxidation film layer, 4...Brazing material layer, 3...Sheath metal, 5...Composite metal wire. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 O Figure 1 b

Claims (1)

[Claims] In a method for manufacturing a decorative composite metal material in which a core material is coated with an outer metal, an antioxidant film layer is provided after activating the outer peripheral surface of the core material, and a brazing filler metal layer is formed on the antioxidant film layer. A method for producing a composite metal material for decoration, which comprises: next providing a metal outer layer, heating the core material and the metal outer layer, and diffusing the anti-oxidation film layer into the brazing material layer.