Grinding by coating or press-fitted in the lap of the abrasive particles through the lap and the workpiece relative motion at a certain pressure on the working surface finishing processing (such as cutting). Grinding can be used for processing a variety of metallic and non-metallic materials, with a flat surface shape processing, internal and outer cylindrical and conical surface, convex, concave spherical, thread, tooth surface and other type of surface. Precision up to IT5 ~ 01, surface roughness up Ra0.63 ~ 0.01 microns.

    Polishing methods generally can be divided into wet grind, grind dry and semi-RESEARCH three categories.

① Wet research: also known as deposited sand grinding, continuous filling of the liquid abrasive or grinding surfaces coated abrasive between the workpiece and the lap constantly sliding and rolling, forming a cutting motion. Wet research generally used for coarse grinding, abrasive powder size used crude in W7.

② dry research: also known as embedded sand grinding, the abrasive pressure uniformly embedded in the surface layer of the lap, grinding only in the auxiliary material lap coated with a small amount of stearate grease and the like. Dry research commonly used in precision grinding, the use of fine powder abrasive particle size in W grinder.

③ Semi research: Wet similar research, the use of abrasive pastes abrasive paste. Grinding either by hand, it can also be carried out on the mill. Workpiece by other processing methods must first obtain high machining accuracy prior to the pre-polishing, polishing the left margin is generally from 5 to 30 microns.