JPH03258208A - Making of noble metal goods for ornament - Google Patents

Abstract

PURPOSE:To heighten the working efficiency of a workpiece and to make the finishing thereof uniform and beautiful by eliminating the bend working and braze working of the workpiece after the press working thereof, by a method wherein a Cu or Cu-alloy member as a core material is inserted into a Pt or Pt-alloy tube, and they are made a false complex by drawing-work, and this false complex is wrought in a desired shape, following which the core material is dissolved in an acid and removed. CONSTITUTION:A Cu bar 2 of which the periphery is coated with oil is inserted into a tube 1 made of a 90% Pt-Pd alloy and they are drawn by a drawing bench, and are made a false complex. After that, with a deforming roll, the false complex is wrought in a desired shape, and is cut off. Such a workpiece is immersed into nitric acid solution, and a Cu core material is dissolved and removed. In this way, a hollow parts 3 can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing precious metal articles for jewelry such as bracelets, necklaces, tie pins, compacts, and rings.

[Prior Art] Recently, some precious metal items for jewelry have been made hollow to increase their volume in order to give them a sense of weight.

A conventional example of the manufacturing method will be described below with reference to the drawings.

Figure 4 (a) is a plan view of the material that has been pressed, Figure 4 (b) is a perspective view of the material that has been bent, and Figure 4 (C
) is a perspective view of the product. A precious metal plate with a thickness of about 0.51 mm is punched out as shown in FIG. )), and then braze the joints (arrows) to make the shape shown in Figure 4 (
It is finished as shown in C) and is used as a precious metal product for jewelry.

[Problem to be solved by the invention]

However, according to the above-mentioned conventional technology, bending must be performed after the bottom shape and drawing process of the press, and this process requires considerable precision, and it is extremely difficult to process complex patterns and shapes. There's a problem. ■Brazing involves the problem of poor workability since brazing between the parts and the ends of the plate requires machining. Furthermore, there is a problem in that this brazing process is very difficult because the plate thickness of the material is thin, so it is very difficult to process the brazing part and the plate end. ■This brazing process causes the product to soften, making it impossible to maintain the strength suitable for jewelry, which requires thickening the material, resulting in an expensive product. be.

■Also, since the brazed parts become uneven and discolor due to heat, polishing, puff finishing, etc. are required to correct them, and these corrections are very time-consuming work. It is. ■Even for products completed through such work, there is a problem in that the incidence of defective products is extremely high due to the difficult work described above.

[Means to solve problems]

The present invention applies Cu or C to Pt or Pt alloy pipes.
U alloy, Fe or Fe alloy or Ni or Ni alloy is inserted as a core metal material, followed by drawing processing to make a pseudo-composite material, and after processing this pseudo-composite material into a desired shape, this pseudo-composite material is The product is characterized in that the outer Pt or Pt gold alloy shell is obtained by dissolving and removing the core metal material with acid.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

First implementation exception diameter 15m5, inner diameter 14.3mm, length 500mm (
7) A Cu rod 2 with a diameter of 14 mm and a length of 700 mm coated with oil on the outer periphery was inserted into the 90ZPt-Pd alloy pipe 1, and was pulled out to a diameter of 12+ nm on a draw bench to obtain a pseudo composite material. Subsequently, it was processed into the shape shown in FIG. 1(a) using a deformed roll, and then cut into the shape shown in FIG. 1(c).

The thus processed product is immersed in a nitric acid solution to form a core metal material.
By dissolving and removing u, a hollow part 3 as shown in FIG. 1(C) was obtained.

Second implementation exception diameter 5.1a+m, inner diameter 4.4mm, length 500m
85 of m! Pt10XPd-5χRu alloy pipe■,
Diameter 4.2mm, length 6 with carbon powder applied to the outer periphery
Insert a Fe rod 2 with a diameter of 3.0 mm and draw it on a draw bench.
It was pulled out to 80111 to obtain a pseudo composite material. Next, it was rolled in a rolling mill to a thickness of 2.2+s and a width of 5.4mm,
As shown in FIG. 2(a), it was punched out using a press die with a diameter of 6.5 mm to form the shape shown in FIG. 2(b), and then press-molded into the desired shape.

The processed product thus shaped was immersed in hydrochloric acid to dissolve and remove Fe of the core metal material, thereby obtaining a hollow part 3 as shown in FIG. 2(C).

3rd implementation exception An 85χ Pi-Pd alloy pipe l with a diameter of 1.0 mm, an inner diameter of 9.3 mm, and a length of 500 mm, and a stainless steel rod with a diameter of 9.0R11I+ and a length of 700 m5 with an oxidized outer periphery 2
was inserted and pulled out on a draw bench to a diameter of 81I1 g to obtain a pseudo composite material.

Next, it was rolled in a rolling mill to a thickness of 1.51 into the shape shown in Figure 3 (a), and then punched into the shape shown in Figure 3 (6). The processed product was immersed in hydrochloric acid to melt and remove the stainless steel core material to obtain a hollow part 3 as shown in FIG. 3(C).

〔Effect of the invention〕

According to the present invention described in detail above, Cu or Cu alloy, Fe or Fe alloy, or Ni or Ni alloy is inserted into a Pt or Pt alloy pipe as a core metal material, and then drawing is performed to form a pseudo composite material. After processing this pseudo-composite material into a desired shape, the outer Pt is removed by dissolving and removing the core material of this pseudo-composite material with acid.
Alternatively, by using a Pt gold alloy, there is no need for bending after press forming, which was conventionally required, resulting in a clean finished product and fewer work steps. ■Brazing has excellent workability because there are no spots, and has the effect of creating a uniform and beautiful finish on the product.Furthermore, brazing has the effect of eliminating the need to remove flux afterwards. ■Due to the presence of the core metal material during press molding, the workpiece is not hollow, making it possible to accurately mold even complex shapes, while also reducing the wall thickness of the product. It has the effect of being able to.

[Brief explanation of drawings]

Figures 1 (a) to (C) are process diagrams showing the first embodiment;
Figures (a) to (C) are process diagrams showing the second embodiment, and Figure 3 (
a) to (C) are process diagrams showing the third embodiment, FIG. 4(a)
~(C) is a process diagram showing a conventional example. 1...Pt or Pt alloy pipe 2 ・Core material ・Hollow parts

Claims (1)

[Claims] 1. Insert Cu or Cu alloy, Fe or Fe alloy, or Ni or Ni alloy as a core material into a Pt or Pt alloy pipe, then draw it to make a pseudo-composite material, and make this pseudo-composite material into the desired shape. After processing into shape,
A method for producing a precious metal article for jewelry, characterized in that the core metal material of this pseudo composite material is dissolved and removed with acid to obtain a product with only the outer Pt or Pt alloy.