Understand polishing industry chain（1）
1、 What is polishing
Polishing refers to the using method of mechanical, chemical or electrochemical action to reduce the surface roughness of the workpieces,inorder to obtain a bright and flat surface. It is to use polishing tools and abrasive particles or other polishing media to modify the surface of workpieces.
2、 Polishing classification
①. Mechanical polishing
Mechanical polishing is a polishing method to obtain a smooth surface, by cutting and plastic deformation of the material surface to remove the convex part after polishing. Generally, oilstone strips, felt wheels, sandpaper, etc. are used. Manual operation is the main method. Auxiliary tools such as turntable can be used for special parts, and ultra precision polishing method can be used for surfaces with high quality requirements. Superfinishing is using a kind of special grinding tool. In the polishing agent containing abrasive, it is pressed on the machined surface of the workpiece to make high-speed rotation motion. The surface roughness of ra0.008 μ M can be achieved by using this technology, which is the highest efficiency among various polishing methods. This method is often used in optical lens mould.
②. Chemical polishing
Chemical polishing is to make the micro protruding part of the material surface dissolve preferentially than 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 need complex equipment, can polish the workpiece with complex shape, can polish many workpieces at the same time, and has high efficiency. The key problem of chemical polishing is the preparation of polishing agent. The surface roughness obtained by chemical polishing is usually 10 μ M.
③. Electropolishing
The basic principle of electropolishing is the same as that of chemical polishing, that is, to make the surface smooth by selectively dissolving the tiny protruding part of the material surface. Compared with chemical polishing, it can eliminate the influence of cathode reaction and has better effect.
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