Manufacturing method of platinum bar and platinum bar mould-pressing device

Abstract

The invention discloses a manufacturing method of a platinum bar and a platinum bar mould-pressing device. The manufacturing method of the platinum bar comprises the following steps of: preparing materials: preparing blank materials according to a corresponding style of the platinum bar; carrying out surface treatment: immersing the blank materials into acid to remove impurities on the surfaces of the blank materials; polishing: utilizing a polishing machine provided with a cloth wheel to polish the blank materials; spraying sand: uniformly carrying out sand spraying treatment on front and rear surfaces of the blank materials; continuously and repeatedly carrying out first-annealing and second-oil-pressing for six times, wherein the annealing temperature is 950 DEG C; parameters of a mould cavity correspond to those of the blank materials; buffing: buffing six faces of the platinum bar by a flying disc of a buffing machine to remove surplus burrs, respectively; electroplating platinum bar: immersing the platinum bar after the buffing treatment into rhodium solution to carry out electroplating on the surface of the platinum bar; and checking: carrying out qualification checking on an electroplated platinum bar product. The platinum bar manufactured by the manufacturing method, provided by the invention, has the advantages of flat character fonts, qualified weight, uniform line, complete and beautiful sanded surface, uniform and smooth and mutually-vertical frames, and obvious comparison effect as a whole.

Description

technical field [0001] The invention relates to the field of precious metal processing, in particular to a method for manufacturing a platinum bar and a device for molding the platinum bar. Background technique [0002] As a precious metal, platinum has an atomic volume of 9.12, a hardness of 4.5, a density of 21.45g / cm3, and a melting point of 1772°C. It has strong chemical stability. In addition to being widely used in aerospace, petroleum refining and chemical industries, it is also Used in the jewelry industry, mainly platinum plain gold jewelry and platinum inlaid jewelry, rarely used for platinum gold bars. Due to the low density of gold, traditional gold bars are easy to make, while platinum is quite difficult to make because of its high density. However, the current processing technology of platinum bars is not effective. The surface of platinum bars is rough and matte, which cannot satisfy customers' aesthetics and value preservation dual needs. Contents of the i...

AI Technical Summary

Problems solved by technology

Due to the low density of gold, traditional gold bars are easy to make, while platinum is quite difficult to make because of its high density. However, the current processing technology of platinum bars is not effective. The surface of platinum bars is rough and matte, which cannot satisfy customers' aesthetics and value preservation the dual needs of

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