The polishing process is mainly used to reduce the surface roughness of the workpiece. When selecting a polishing process method for a metal workpiece, different methods can be selected according to different needs. The editor will share several common methods of the polishing process.
1. Mechanical polishing
Mechanical polishing is a method of polishing to obtain a smooth surface by cutting and plastically deforming the surface of the material to remove the polished convex part. Generally, oil stone strips, wool wheels, sandpaper, etc. are used. Using auxiliary tools such as turntables, ultra-fine grinding and polishing methods can be used for high surface quality requirements.
2. Chemical polishing
Chemical polishing is to make the microscopic convex part of the surface of the material dissolve preferentially compared with the concave part in the chemical medium, so as to obtain a smooth surface. The main advantage of this method is that it does not require complex equipment, can polish workpieces with complex shapes, and can polish many workpieces at the same time, with high efficiency. The core problem of chemical polishing is the preparation of polishing fluid. The surface roughness obtained by chemical polishing is generally several 10 μm.
The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, to make the surface smooth by selectively dissolving the tiny protrusions on the surface of the material. Compared with chemical polishing, it can eliminate the influence of cathode reactions, and the effect is better.
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