Method for electroforming hard gold product

A technology of hard gold and products, applied in the field of gold production, can solve the problems of low yield, insufficient hardness, easy deformation, etc.

Inactive Publication Date: 2009-10-21
武汉金凰珠宝股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for electroforming hard gold products aimed at the disadvantages of insufficient hardness, easy deformation, and low yield rate of gold products produced by the above-mentioned existin...

Method used

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  • Method for electroforming hard gold product

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Embodiment Construction

[0019] Such as figure 1 Shown is the flowchart of the method for electroforming hard gold products of the present invention. The method for electroforming hard gold products of the present invention specifically comprises the following steps:

[0020] Step 1. Starting plate: measure the size of the sample of the gold product to be processed, conduct pattern approval, and carve the sample with oil mud.

[0021] Step 2. Invert the mold: pour the engraved sample into the mold, inject wax into the rubber mold after the mold is turned over, and vacuumize the sample to make a wax mold; specifically, the mold includes pouring the glue and turning over the mold. The two-step process of receiving wax is the process of pouring glue and turning over the mold. The surface layer of the sample is covered with silica gel, and the silica gel is left to dry naturally, and then the sample is taken out to make a rubber mold; the wax is injected into the prepared rubber mold. Vacuum until the s...

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Abstract

The invention relates to a method for electroforming hard gold products. The method comprises the following steps: template picking, mould pouring, wax repairing and electric conducting layer coating are carried out to obtain a wax mould of a gold product to be processed, and a layer of electric conductive oil is coated on the surface of the wax mould; and a titanium net is taken as anode in the gold electroforming step, the wax mould coated with the electric conductive oil is put in an electrotyping bath as cathode, the electroforming solution is put in the electrotyping bath and includes sulfurous acid gold potassium, ammonium sulfite and potassium citrate, wherein the sulfurous acid gold potassium is combined with the ammonium sulfite, a trivalent gold ion is reduced into a univalent gold ion, the univalent gold ion generates close crystal grains, the close crystal grains are combined through the potassium citrate to form complexing gold through PH buffer solution, the gold is deposited on the wax mould to form a casting gold layer, and the half-finished product is prepared; and the wax film in the half-finished product and the electric conductive layer are removed in the wax removal step and the electric conductive layer removal step to obtain the finished product. The volume and the hardness of the gold product are changed by using the variation of the chemical structure of the gold ion, so that the hardness, the volume and the toughness of the gold product meet the standards simultaneously.

Description

technical field [0001] The invention relates to the field of gold production, in particular to a method for electroforming hard gold products. Background technique [0002] With the improvement of people's living standards, gold, as a noble metal with stable chemical properties (density: 19.3g / cm3, melting point 1062.7°C) and good physical properties (plasticity, ductility), its application range is becoming wider and wider. , such as: making jewelry, decoration pieces, hardware pieces, etc. With the development and utilization of gold products in various fields, people have higher and higher requirements for the quality, volume and hardness of gold products, and the shape of gold products is becoming more and more complicated. In the prior art, the electroforming gold process can It breaks through the shortcomings of the previous gold processing technology, such as simple shape, rigid shape, and difficult variety. The gold products obtained by the electroforming gold proce...

Claims

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Application Information

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IPC IPC(8): C25D1/00C25D3/48
Inventor 张远江严进孙笑孙家杭
Owner 武汉金凰珠宝股份有限公司
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