What is the main purpose abrasive roll

By coating or press-fitted in the lap of the abrasive particles and the workpiece by relative movement of the lap at a certain pressure on the working surface of the finishing process (e.g., cutting). Grinding can be used for processing of various metals and non-metallic materials, surface machining with a flat shape, inner cylinder and the outer conical surface, convex and concave spherical, threads, and other type of tooth surfaces. Processing accuracy IT5 ~ 01, the surface roughness up Ra0.63 ~ 0.01 microns.
Wet grinding method can be divided into research, and semi-dry grind grind three categories. ① wet grind: grinding, also PINEZONE zirconia flap disc  known as sand deposited, the continuous filling or coating liquid abrasive surface grinding, abrasive between the workpiece and the lap constantly sliding and rolling to form a cutting motion. Wet research generally used for rough grinding, abrasive powder used coarse granularity in W7. ② Dry RESEARCH: also known as embedded sand grinding, the abrasive embedded in the uniform pressure in the lap of the surface layer, only when the polishing surface of the auxiliary material is coated with a lap fat blend small amounts of stearic acid and the like. Research commonly used in dry fine grinding, abrasive powder used in fine granularity W7. ③ semi Research: Research similar wet, the PINEZONE sanding roll  use of abrasive grinding paste is a paste. Either by hand polishing, polishing may be performed on the machine. Workpiece by other processing methods must first be obtained in a high precision before the pre-polishing, polishing the left margin is generally 5 to 30 microns.
Lap is shaping the workpiece grinding tools, but it is also the carrier of abrasive hardness should be less than the hardness of the workpiece, but also some wear, often made of gray cast iron. Wet grind lap ferrite microstructure dominated; dry grind lap uniform and fine pearlite places as the matrix. The following grinding M5 thread and small PINEZONE Bonded abrasives  parts of complex shape, commonly mild steel lap. When grinding holes and soft metal materials, mostly made of brass, copper lap. Lap should be sufficiently rigid working surfaces have a high geometric precision. Lap grinding and cutting process is also subject to wear, such as operating properly, its accuracy can be improved, so that the processing accuracy of the workpiece can be higher than the lap of the original accuracy.