JP2580513B2 - Manufacturing method of precious metal ornaments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing precious metal decorative articles.

[0002]

2. Description of the Related Art Hitherto, decorative articles of various designs have been manufactured for precious metal decorative articles by handwork using a technique such as rolling, sanding, shaving, brazing, or the lost wax method.

[0003]

SUMMARY OF THE INVENTION A method of manufacturing by the lost wax method, which has been widely used in the past, and a fusion of a preformed body by forging, casting, plate, wire processing or a porous formed body by thermal spraying and powder sintering. This is a manufacturing technique for obtaining precious metal decorative articles having unprecedented shapes, patterns and colors.

[0004]

The preformed body in the present invention is formed by forging, casting, thermal spraying, handwork, laser, electron beam processing, or the like. In addition, the porous molded body is made of a mixture of a noble metal powder and an organic additive, and this molded body is
It is made by heating to 0-500 ° C. to remove additives and then firing. After setting the molded body in a mold such as a rubber mold, a wooden mold, or a plaster mold, wax is press-fitted to form a model in which the molded body and the wax are integrated. It is dewaxed at -150 ° C and fired at 500-800 ° C to obtain a mold. A predetermined noble metal melt is poured into the mold and filled into spaces or pores other than the molded body. After that, when the mold is removed, the molded body is integrated with the cast metal and becomes a decorative article having various shapes and patterns.

[0005]

【Example】

Example 1 90 g of pure Au powder, microcrystalline wax 4
g, 5 g of beeswax and 1 g of stearic acid after molding,
After removing the additives other than Au, firing was performed to obtain a network-like porous sintered body. After setting this sintered body in the cavity of the ring-making rubber mold, the wax was heated at 70 ° C. to a temperature of 0.1 mm.
A model in which the wax and the sintered body were integrated by press-fitting at 8 kgf / cm ² was produced. This integrated model was buried in a mold material mainly composed of quartz and gypsum powder, and then heated to 100 to 150 ° C. to remove wax. Next, the mold was fired at 800 ° C., and a melt of Au-Ag-based 18k white gold was poured into the mold and filled into the pores of the sintered body at the same time as the mold cavity. A ring with a pattern was obtained.

Example 2 A mixture of 85 g of Au-Cu pink gold powder, 5 g of ethylcellulose, 10 g of polystyrene, 3 g of oleic acid, and 2 g of stearic acid was removed, and after removing the additives other than the gold powder, the mixture was fired. To obtain a bird-patterned porous sintered body. After setting the sintered body in the cavity of the pendant working rubber mold, the wax was heated at 65 ° C.
A model in which the wax and the sintered body were integrated by press-fitting at 0.6 kgf / cm ² was produced. This integrated model was buried in a mold material mainly composed of quartz and gypsum powder, and then heated to 100 to 150 ° C. to remove wax. Next, the mold is fired at 800 ° C.
The Ag alloy was poured into the mold to fill the mold cavity and the pores of the sintered body, thereby obtaining a pendant having a pink bird pattern on a white background.

Example 3 93 g of pure Pt powder, 4 g of beeswax, 1.5 of polystyrene
g, 1 g of oleic acid, and 0.5 g of stearic acid were molded, and after removing the additives other than the Pt powder, the mixture was fired to obtain a porous sintered body having an autumnal pattern. After setting the sintered body in the cavity of the working rubber mold for pendant, wax was press-fitted at 65 ° C. and 0.8 kgf / cm ² to produce a model in which the wax and the sintered body were integrated. After immersing this integrated model in a mold material mainly composed of quartz and gypsum powder, 100-1
The wax was removed by heating to 50 ° C. Next, mold 8
It was baked at 00 ° C., and an 18 kAu alloy was cast into this mold to obtain a pendant having a yellow autumn leaf pattern on a white background.

Example 4 A porous body of a carp Pt-Pd alloy was prepared by a thermal spraying method. After setting this processed body in the cavity of the working rubber mold for making a broach, the wax was cooled at 65 ° C. and 0.6 kgf / cm ^2.
To produce a model in which the wax and the porous body were integrated. This integrated model was buried in a mold material mainly composed of quartz and gypsum powder, and then heated to 100 to 150 ° C. to remove wax. Next, the mold was fired at 800 ° C., and an 18 kAu alloy was cast into the mold to obtain a broach having a white carp pattern on a yellow background.

Example 5 A pre-processed body having a cherry blossom pattern was prepared using Pt wire. After setting this processed body in the cavity of the working rubber mold for making a broach, the wax was cooled at 65 ° C. and 0.6 kgf / cm ^2.
To make a model in which the wax and the pre-processed body were integrated. This integrated model was buried in a mold material mainly composed of quartz and gypsum powder, and then heated to 100 to 150 ° C. to remove wax. Next, the mold was fired at 800 ° C., and an 18k gold alloy was cast into the mold to obtain a broach having a white cherry blossom pattern on a yellow background.

Example 6 A leaf-shaped porous processed body was prepared using a net made of pure Au (Net). After setting the processed body in the cavity of the working rubber mold for pendant, the wax was cooled at 65 ° C. and 0.6 mm.
A model in which the wax and the pre-processed body were integrated by press-fitting at kgf / cm ² was produced. This integrated model was buried in a mold material mainly composed of quartz and gypsum powder, and then heated to 100 to 150 ° C. to remove wax. Next, the mold was fired at 800 ° C., and an Au—Al alloy (purple Au alloy) was cast into the mold to obtain a pendant having a white leaf pattern on a purple background.

Example 7 A leaf-shaped pre-processed body having leaf veins framed by laser processing from a Pt-Pd alloy plate was prepared. After setting this leaf part in the cavity of the rubber mold for making broach, wax was press-fitted at 65 ° C. and 0.8 kgf / cm ² to prepare a model in which the wax and the preform were integrated. After burying this integrated model in a mold material mainly composed of quartz and gypsum powder,
The wax was removed by heating to 100-150 ° C. Next, the mold was fired at 800 ° C., and a melt of 18 kAu alloy was cast into the space between the cavity and the veins of the mold to obtain a pendant in which the leaves of white leaves were arranged on a yellow background.

[0012]

As described above, the present invention provides a space body and a porous body obtained by the lost wax method, powder metallurgy, thermal spraying, handwork, forging, laser processing, etc., which have been conventionally used in the production of precious metal decorations. By fusing with the textured body, it is possible to manufacture precious metal decorative articles having various and complicated shapes and patterns that could not be produced conventionally, and it is possible to significantly increase the added value of the decorative articles.

Claims (1)

(57) [Claims] 1. A semi-finished decorative product or a porous molded product having a porosity of 10 to 90% using a pure metal of Au, Ag, and Pt and an alloy mainly containing these elements and partially having a space in a part thereof. After setting these preprocessed semi-finished products or molded products in a mold for wax model production, press the wax into the spaces or pores of the preformed products and integrate them with this molded product Then, a mold is made using the integrated model according to the lost wax method, and a simple substance or alloy of a precious metal different from the preform is cast in the mold to form a space and a pore of the preform. A method for producing a precious metal decorative article, characterized in that it is filled and joined by mechanical or fusion to a contact portion with a preform so as to have different hues and various shapes and patterns.