Laser sand blasting methods applied to precious metal commemorative coin

Abstract

The invention relates to laser sand blasting methods applied to a precious metal commemorative coin. The methods comprise two laser sand blasting methods for realizing a gradual change effect and realizing a planar visual three-dimensional embossing anti-counterfeiting effect; and a gradient change map and a relief image with a vector line are manufactured and are then converted into laser files to be input into a laser etching machine for sand blasting. The laser sand blasting methods have the beneficial effects that laser gradual change sand blasting can replace manual gradual change sand blasting, the consistency and the yield of the mold effect are ensured, the efficiency is improved by more than 10 times, and the laser sand blasting service life is longer than manual sand blasting; and planar visual three-dimensional embossing anti-counterfeiting can realize a three-dimensional visual effect on a plane, the three-dimensional effect is enhanced on a thin relief, the layering feeling, the three-dimensional feeling and the artistic effect of a mold are more intense, precious metal products are more rich and beautiful, meanwhile, the anti-counterfeiting technology can be embeddedand used, and counterfeiters can be difficult to counterfeit.

Description

technical field [0001] The invention relates to a laser sand blasting method, in particular to a laser sand blasting method applied to precious metal commemorative coins. Background technique [0002] In order to achieve the gradient effect of precious metal commemorative coins, the domestic mints currently use the traditional manual sandblasting technology. Carry out secondary processing to achieve the required gradient sandblasting effect. This process requires the operator to have a certain art quality and experience in mold hand-carving. The skill requirements are high and the work efficiency is low. Faced with this situation, the Shenyang Mint developed A laser sandblasting method based on a laser etching machine is proposed to solve the above problems. [0003] On this basis, through continuous practice and research, the use of laser sandblasting method can also achieve the anti-counterfeiting effect of plane vision and three-dimensional relief of precious metal comme...

AI Technical Summary

Problems solved by technology

Although the banknote industry has applications similar to this kind of optical effect, they are all realized through the arrangement of printed pattern lines, which is different from the principle and method of laser sandblasting, and the macroscopic nature of the pattern lines is more obvious. You can see that each The shape of the line, while laser sandblasting is microscopic and random, and the anti-counterfeiting features and space of anti-scanning and anti-copying are relatively large