1 mechanical polishing mechanical polishing is a polishing method to obtain a smooth surface through cutting and plastic deformation of the material surface. Generally, it is oilstone strips, wool wheels, sandpaper, etc. Both are adopted, and manual operation is the main method. For special parts such as the surface of rotating body, auxiliary tools such as turntable can be used. If the surface quality is high, ultra-precision grinding and polishing can be used.

2 chemical polishing chemical polishing is to make the micro-convex part of the material surface dissolve before the concave part in the chemical medium, so as to obtain a smooth surface. The main advantages of this method are that it does not need complicated equipment, can polish workpieces with complicated shapes, can polish multiple workpieces at the same time, and has high efficiency.

The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, by selectively dissolving the tiny protrusions on the surface of the material, the surface is smooth.

4 ultrasonic polishing: put the workpiece into abrasive suspension and put it in ultrasonic field together, and polish the abrasive on the surface of the workpiece through ultrasonic oscillation.

5 fluid polishing liquid polishing is to use high-speed flowing liquid and its abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing.

6 magnetic grinding and polishing magnetic grinding and polishing is to use magnetic abrasive to form grinding brush under the action of magnetic field to grind the workpiece.