Optical device for metal surface polishing

Abstract

The invention provides an optical device for metal surface polishing. A laser beam emitted from a femtosecond laser light source passes through a yttrium vanadate birefringent crystal, an attenuationpipe and a focusing objective lens to be focused on a metal surface on a 3D mobile platform and conduct laser polishing treatment on the metal surface to obtain the smooth polished surface. The optical device for metal surface polishing, provided by the invention, realizes polishing on the metal surface by controlling related femtosecond laser machining parameters. Compared with an existing mechanical polishing method, one-time large-area quick polishing and micro-area polishing can be realized without abrasive paper, abrasive paste, chemical corrosive agents and other auxiliary materials. Moreover, the whole machining process is simple and easy to operate, the thermal effect can be neglected, and the high-precision polishing effect can be achieved. Meanwhile, through non-contact machining, damage, contamination and the like of stress to the surface of metal tungsten sample can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of optical processing, in particular to an optical device for polishing metal surfaces. Background technique [0002] As a refractory metal with high strength and high hardness, metal tungsten has good chemical stability and is not easy to be corroded. It has been widely used in electronics, light source, machinery industry and other departments. However, due to the high hardness of metal tungsten, when the traditional mechanical grinding and polishing method is used, the polishing cycle is long, the polishing accuracy is poor, the efficiency is low, and a variety of abrasives need to be added during the polishing process, so the price of polished metal tungsten products is generally higher. High, of which the polishing cost can account for more than half, while other more mature polishing methods, such as ion beam polishing, chemical polishing, electrolytic polishing, etc., usually require a strict process...

AI Technical Summary

Problems solved by technology

[0004] However, when long-pulse lasers are used to polish metal materials such as tungsten, more thermal effects will be generated on the surface of the material, resulting in a large temperature gradient of the material, which will generate greater thermal stress and pull the surface of the material to form cracks. This stress damage leads to polishing. The level of precision achieved is not high, and the surface roughness is usually on the order of microns

In addition, its polishing effect on metal is also affected by many factors, including laser wavelength, beam incident angle, laser scanning speed, scanning mode, etc., and how to accurately control various parameters to form a suitable thickness in a fixed area on the metal surface The molten metal layer still faces great challenges

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