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Process for producing case or accessories of precious metal wristwatch

A production process and precious metal technology, applied in the direction of electrolysis, electroforming, etc., can solve the problems of unsatisfactory dimensional accuracy, watch case manufacturing, etc.

Active Publication Date: 2015-04-08
吉林鼎辉电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the watch cases appearing on the market have solid structures, and the cases cannot be made of high-purity gold, generally 18K gold; some hollow gold ornaments on the market, the hollow part is made of wax mold or low melting point Bismuth-tin alloy is used to make molds, which are manufactured by electroforming
This approach can meet the production of general decorative parts, but it cannot meet the production of parts with high dimensional accuracy requirements, such as watch cases or other decorative parts with high assembly requirements

Method used

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  • Process for producing case or accessories of precious metal wristwatch
  • Process for producing case or accessories of precious metal wristwatch
  • Process for producing case or accessories of precious metal wristwatch

Examples

Experimental program
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Embodiment 1

[0021] Embodiment one: if Figure 1~3 As shown, a production process of a precious metal watch case or trim of the present invention comprises a mold type 1, a copper electroplating layer 2 and a precious metal watch case layer 3, and the material of the mold type 1 is No. 3 zinc alloy, and the mold type The first is obtained by die-casting; the copper electroplating layer 2 is obtained by electroplating a certain thickness of copper on the model 1; the precious metal watch case 3 is obtained by electroforming a certain thickness of precious metal on the copper electroplating layer. It is hard solid gold; the discharge hole 4 is a hole drilled after electroplating copper and precious metals; the mold type 1 (the material is zinc alloy) and the copper electroplating layer 2 are formed by adding hydrochloric acid with a mass fraction of 37% and Heating to the boiling point for chemical reaction and melting, the zinc alloy is completely dissolved in hydrochloric acid, and dischar...

Embodiment 2

[0028] Embodiment two: if Figure 4~6 As shown, the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the watch case 3 is provided with a reinforcing tube 5; the discharge hole 4 is opened on the side wall of the reinforcing tube 5 .

[0029] The more specific production steps are: first die-cast the No. 3 zinc alloy to make the mold, put the mold into the CuSO4 electroplating solution with a mass fraction of 85% for electroplating, the electroplating working temperature is 60 ° C ~ 70 ° C, the current density 100A / cm 2 , the electroplating time is 3 minutes; after taking it out of the CuSO4 electroplating solution, wash it in clean water for 1 minute, and then put it into the electroforming tank for electroforming. 2 , the electroforming time is 2 minutes; take it out of the CuSO4 electroplating solution and wash it in clean water for 1 minute, and then soak it with 37% hydrochloric acid at a temperature of 60°C after drilli...

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Abstract

The invention relates to a process for producing a case or accessories of a precious metal wristwatch. The method is characterized by comprising the following steps: firstly preparing a zinc alloy into a mold block in a die-casting manner, and finishing a die casting so as to ensure that the assembly size and surface roughness reach the requirements; sequentially carrying out electro-coppering and electro gilding, namely, electrochemical hardening gold, on the mold block; in order to enable parts to reach hard pure gold, removing the zinc alloy and copper inside the parts which comprises the following steps: drilling the parts subjected to electro-coppering and precious metal electroplating, by adding hydrochloric acid inside drilled blow-off holes and heating to a boiling point, carrying out chemical reaction and melting, dissolving the all zinc alloy in hydrochloric acid and flowing out, also dissolving a part of the copper in hydrochloric acid and flowing out; cleaning with clean water; by introducing sulfuric acid and heating to a boiling point, carrying out chemical reaction and melting, completely dissolving the copper electroplating layer in sulfuric acid and flowing out to obtain hard pure gold parts; and cleaning the parts with clean water to obtain hollow case or accessories of the precious metal wristwatch. The hollow parts prepared by the method, which is disclosed by the invention, has good size accuracy and appearance surface which can reach the desired degree of finish.

Description

technical field [0001] The invention relates to a production process of a precious metal watch case or decoration. Background technique [0002] At present, the watch cases appearing on the market have solid structures, and the cases cannot be made of high-purity gold, generally 18K gold; some hollow gold ornaments on the market, the hollow part is made of wax mold or low melting point Bismuth-tin alloy is used to make molds, which are manufactured by electroforming. This approach can meet the production of general decorative parts, but it cannot meet the production of parts with high dimensional accuracy requirements, such as watch cases or other decorative parts with high assembly requirements. At the same time, wax molds or bismuth-tin alloy molds are made by pouring, and their surfaces are relatively rough, and the surface of gold electroforming is correspondingly rough. Contents of the invention [0003] The present invention makes improvements to the above-ment...

Claims

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Application Information

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IPC IPC(8): C25D1/02
Inventor 林祥平
Owner 吉林鼎辉电子科技有限公司
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