Machining method for precious metal article

Abstract

The invention discloses a machining method for a precious metal article. The method comprises the process of making a precious metal blank into a lath and is characterized by comprising the step of titanium plating, wherein the titanium plating step comprises the steps of plating a titanium film on the surface of the precious metal lath through a magnetron sputtering method and then carrying out subsequent machining. According to the machining method for the precious metal article, a rolling technology is optimized, a precious metal commemorative coin is produced by combining a titanium plating technology and a stamping technology, so that the wear resistance, the corrosion resistance and the hardness of the precious metal commemorative coin can be improved under the conditions that the forming quality and the machining precision are ensured, and therefore the quality of the precious metal commemorative coin can be guaranteed for a long time.

Description

[0001] This application is a divisional application of an invention patent titled: A processing method for precious metal commemorative coins, and the application number is: 201610275402.1. The application date of the parent application is April 29, 2016. technical field [0002] The invention belongs to the technical field of precious metal processing and shaping, and in particular relates to a processing method of precious metal objects. Background technique [0003] Precious metals are commonly used: gold, silver, platinum, palladium and their alloys. Manufacturing jewelry and industrial parts are generally manufactured by the following processes: hand-crafted, precision casting, pressure processing, machining, electroforming, welding and other methods. Among precious metal bead ornaments, various styles and shapes of beads and chain precious metal jewelry make the types of precious metal jewelry complicated, but it also challenges the technological capabilities and techni...

AI Technical Summary

Problems solved by technology

In the collection of precious metal commemorative coins, commemorative coins are often corroded and oxidized by the external environment. For example, when people collect gold commemorative coins, after the gold commemorative coins come into contact with human skin, they will absorb the toxins and sweat of human skin and turn black hair At the same time, gold commemorative coins will also react with people's daily necessities (such as mercury in cosmetics) and sulfur in the air and become black. When the gold commemorative coins rub against each other with platinum rings or platinum necklaces, the gold commemorative coins The surface will also be whitened by rubbing platinum, and these problems will damage the interests of collectors; because the higher the purity of gold and silver, their softness is higher and the wear resistance is lower. For silver commemorative coins, the quality of gold and silver will gradually decrease during long-term scratching, which will affect the weight and dimensional accuracy of commemorative coins. These problems will lead to a reduction in the collection value of commemorative coins