JP2005169926A - Matting method of gold ornament - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a matting method of a gold ornament which enables direct matting of the gold ornament, uniform and excellent matting of an ornamental surface having indentations or the like and attainment of matte gold of a high quality. <P>SOLUTION: In the matting method of the ornament having the ornamental surface having indentations or the like, matting is performed by a process wherein 18-carat bullion is melted to be at a prescribed molten metal temperature and the molten bullion is cast into the mold face of a manufacturing mold which is prepared in the shape of a product to be obtained and is kept at a prescribed mold temperature, so as to make a base product, a primary polishing process wherein the base product is subjected to electrolytic polishing for a prescribed time, a heating process wherein the whole base product subjected to the primary polishing is heated to a desired temperature, a cooling process wherein the heated base product is subjected to air cooling or slow cooling in the atmosphere and a secondary polishing process wherein the surface of the base product is subjected to bright polishing thereafter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for smoldering a gold ornament, particularly a ring.

In general, the precious metal smoldering is widely known in the case of silver ornaments, and, for example, a means for obtaining a brilliant decoration by forming a plating layer of a white color tone, a black color tone, and a gold color tone is devised. (Patent Document 1), however, in the case of gold ornaments, the present situation is that the bulge is not directly applied to the metal.
JP-A-6-306675

  Therefore, the present invention can make it possible to directly apply a smoldering process to a gold ornamental bullion, and can evenly and satisfactorily perform a smoldering process of decorative surfaces such as irregularities. An object of the present invention is to provide a method for smoldering a gold ornament from which gold can be obtained.

The above-described problems are solved by the invention described in each claim.
That is, the invention according to claim 1 is a method of smoldering a decorative article having a decorative surface such as irregularities,
A process of manufacturing an unfinished product by melting an 18 gold ingot at a predetermined molten metal temperature and pouring it into the mold surface of a production mold that is manufactured in the shape of the product to be obtained and maintained at the predetermined mold temperature. When,
A primary polishing treatment step of electrolytic polishing treatment of this elementary product for a predetermined time;
A heat treatment step to the desired temperature of the entire primary polished primary product,
A cooling process step of air-cooling / removing the raw product after the heat repair in the air;
Then, a secondary polishing process step for polishing the surface of the raw product with gloss,
It consists of

  The invention described in claim 2 is the method of smoldering gold ornament according to claim 1, wherein the 18 gold bullion is a bullion selected from yellow gold, red gold, or white gold. It is characterized by being.

  The invention according to claim 3 is the method of smoldering a gold ornament according to claim 1, wherein the heat treatment step is performed at a temperature of about 600 ° C. to 700 ° C. and the whole is substantially dark red. It heats until it becomes.

  According to the first aspect of the present invention, the gold bullion can be directly squirted and the decorative surface such as irregularities can be squirted uniformly and satisfactorily, and a high quality squirt can be obtained. Can do.

  According to the description of claim 2, it is possible to directly apply the bulge to the bullion of the 18K gold ornament made of yellow gold, red gold, white gold, etc. Uniform and good can be achieved, high-quality squirting can be obtained, and smolding can be satisfactorily performed, and high-quality squirting can be obtained.

  According to the third aspect of the present invention, in the heat treatment step, by heating at a temperature of about 600 ° C. to 700 ° C. until the whole becomes approximately dark red, The gold can be directly squirted, and the decorative surface such as irregularities can be squirted uniformly and satisfactorily, and a high quality squirt can be obtained.

  Next, the best mode for carrying out the present invention will be described according to examples.

Hereinafter, the smoldering method of the present invention will be described.
First, a bullion used for a gold ornament of the present embodiment, for example, a ring or the like (also simply referred to as a product in the present specification) employs an 18 bullion, The bullion is, for example, yellow gold consisting of Au 75%, Ag 12.5%, Cu 12.5%, red gold consisting of Au 75%, Ag 6.25%, Cu 18.75%, white gold consisting of Au 75%, Pd 25%, etc. Is selected from.

Then, as the first step, the mold surface of the production mold in which the 18-metal ingot is melted to a predetermined molten metal temperature and manufactured into the shape of the product from which the molten metal is to be obtained and maintained at the predetermined mold temperature. The raw product (in this specification, the product up to the final process is referred to as a raw product) is formed by pouring into the inside.
In this case, for example, in a molded product of a ring, a desired uneven design is applied to the surface (including the inner, outer diameter, and end surface).

  When the 18 gold bullion is yellow gold, it is desirable to set the molten metal temperature to about 860 ° C. to 960 ° C., and to set the mold temperature of the production mold to about 700 ° C. to 750 ° C. In the case of red gold, it is desirable to set the molten metal temperature to about 875 ° C to 975 ° C, and the mold temperature of the production mold to about 700 ° C to 750 ° C. In this case, it is desirable to set the molten metal temperature to about 1280 ° C to 1380 ° C, and to set the mold temperature of the production mold to about 700 ° C to 750 ° C.

Next, as a second step, the raw product taken out from the production mold is subjected to primary polishing for a predetermined time by electrolytic polishing using an acidic liquid electrolytic polishing agent.
That is, with the raw product immersed in the electrolytic polishing bath, the surface of the raw product is subjected to a temperature of about 80 ° C., a pressure of about 4 V to 6 V, and a polishing time of about 20 seconds to 45 seconds. Polish once so that glossiness is exposed.

  In this case, since the surface (skin) of the raw product that has been taken out from the production mold causes “unevenness” in the smoldering process, it is particularly desirable to uniformly polish the concave interior of the decorative surface with irregularities. .

And as a 3rd process, the whole product which carried out the said primary polishing process is heat-processed (smoldering process) without the "unevenness" the whole by means, such as a gas burner.
In this case, even if the gold bullion used is yellow gold, red gold or white gold, the heating temperature is set to about 600 ° C. to 700 ° C. until the whole product becomes almost dark red. It is desirable to heat.

Next, as a fourth step, the raw product that has been heat-treated until it becomes about the dark red color is cooled (cooled) in an air-cooled state in a state of being left in the atmosphere.
In this case, the problem of causing the risk of peeling of the smoldering due to the rapid cooling by water cooling is solved by performing cooling (cooling) in an air-cooled state.

Then, as the final fifth step, the cooling-treated raw product is subjected to a secondary polishing process on the entire surface of the raw product with sandpaper, buffing, etc., and the surface is subjected to a glossy finishing process, and then an smoldering process is performed. A product as a ring applied is obtained.
In this case, after polishing the entire surface using sandpaper of 400 mesh to 1000 mesh in order, polishing treatment is performed with a buff to which a solid abrasive is attached, and the final gloss finish of the entire surface is performed. desirable.

  As described above, for example, a gold ingot of a ring, which is a gold ornament, can be directly subjected to a smoldering process, and the smoldering is not easily peeled off, so that it is an uneven decoration. Even in the case of a surface, it can be applied uniformly and satisfactorily, and a high-quality squib can be obtained.

In the present embodiment, for example, a ring has been described as a gold ornament. However, the present invention is not limited to this ring, and various gold ornaments such as a necklace and a pendant can be used. Is.

Claims (3)

A method of smoldering decorative articles having decorative surfaces such as irregularities,
A process of manufacturing an unfinished product by melting an 18 gold ingot at a predetermined molten metal temperature and pouring it into the mold surface of a production mold that is manufactured in the shape of the product to be obtained and maintained at the predetermined mold temperature. When,
A primary polishing treatment step of electrolytic polishing treatment of this elementary product for a predetermined time;
A heat treatment step to a desired temperature of the entire primary polished primary product,
A cooling process step of air-cooling / removing the raw product after the heat repair in the air;
Then, a secondary polishing process step for gloss polishing the surface of the raw product,
A method for smoldering gold ornaments characterized by comprising: The gold ornament smoldering method according to claim 1, wherein the 18 gold bullion is a bullion selected from yellow gold, red gold, and white gold. Smoldering method of goods. 2. The method of smoldering gold ornament according to claim 1, wherein the heat treatment step is performed by heating at a temperature of about 600 ° C. to 700 ° C. until the whole becomes approximately dark red. Smoldering method for gold ornaments.