Method for carrying out colorful marking on surface of mirror metal material by using femtosecond laser

Abstract

The invention relates to the technical field of laser marking, in particular to a method for carrying out colorful marking on the surface of a mirror surface metal material by utilizing femtosecond laser. The method comprises the following steps of inputting boundary dimension information of a product into a laser processing software system, and reading a pre-designed laser machining drawing file;using a CCD visual positioning system to perform outline grabbing and positioning on a product surface machining area, and meanwhile, automatically adjusting the focus height to guarantee that the product surface is located at the laser focus position; and controlling a femtosecond laser and a beam shaping device to carry out colorful marking on the product surface machining area. Different machining drawing files can be designed according to different requirements for the colorful effect of each sub-area, colorful patterns with different effects are marked on the same product surface, colorful marking is carried out on the surface of the mirror metal through the method, the optical characteristics of the metal surface are changed, different colors are shown at different observation angles, the colors are dazzling, changeable, bright and good in uniformity, and the product appearance and the product added value can be improved.

Description

technical field [0001] The invention relates to the technical field of laser marking, in particular to a method for performing colorful marking on the surface of a mirror metal material by using a femtosecond laser. Background technique [0002] There are two traditional methods in the field of color processing on the surface of metal materials. One is to coat different colors of paint on the surface of metal materials, and the other is to use electrochemical coloring. Both methods will bring serious environmental problems. Pollution, especially in the field of surface coloring of precious metals, these two methods will cause changes in the purity of precious metals, so these two traditional methods have been phased out in the field of surface color processing of high-end metal materials. [0003] At present, there is a technology that uses lasers to color-mark the surface of mirror metal materials. Usually, picosecond or nanosecond lasers are used for color marking, and whe...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the above-mentioned deficiencies existing in the existing metal material surface color processing methods, and provides a method for using a femtosecond laser to perform colorful marking on the surface of a mirror metal material. The method of coating different colors of paint on the surface of metal materials or the method of electrochemical coloring during processing will bring serious environmental pollution, especially in the field of precious metal surface coloring. These two methods will cause the purity of precious metals to deteriorate. It also solves the technical problem of changing, and at the same time solves the problem that when a picosecond or nanosecond pulse width laser is used to act on the surface of a metal material, an oxide film will be formed on the surface of the material, and the thickness of the oxide film cannot be stably controlled, which will eventually lead to interference. The colors are different, which is a technical problem that affects the final colorful effect

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