Grinding wheel grinding process

Abrasive machining methods such as grinding, honing, lapping and polishing, in which the most widely used of grinding. When grinding of grinding various grits are quite different, as shown. ( 1) Relatively prominent in the grinding wheel and comparison of sharp abrasive cutting role these grits, at the beginning of the contact with the workpiece due to the depth of cut into tiny, abrasive edge sharp arc negative rake Angle is large, the workpiece surface only produce elastic deformation; Increases with cutting depth, abrasive grain and workpiece surface, the pressure between the workpiece surface produce plastic deformation and score the grooves; When the cutting depth increase, cut metal layer to produce obvious slip to form a chip. This is typical of abrasive cutting process, the nature and the process of cutting metal cutting tool (same As shown in figure a) 。 ( 2) Grinding wheel on the bulging height smaller or more blunt abrasive score role these abrasive cutting effect is very weak, when in contact with the workpiece due to the thickness of cutting layer is very thin, abrasive grain is not cutting, but imprint the tiny grooves on the surface, on either side of the workpiece material is squeezed to the grits and uplift ( As shown in figure b) 。 ( 3) On the grinding wheel dull or more concave grinding grain under these grits neither cutting or indented artifacts, and only brush with workpiece surface smooth, friction and polishing effect, As shown in figure c) 。 Even more sharp and projection of single abrasive grain, the cutting process can be roughly divided into three stages ( As shown in the figure below) 。 In the first stage, the particle from the surface smooth clean through, the only elastic deformation and no chip. Cut into the workpiece surface layer, the second phase, grits score out of the trench and uplift is formed. The third stage, cutting layer thickness increases to a critical value, cut off chip. Grinding process is actually a complex workpiece surfaces of countless cutting, score, wipe three effect of integrated process. Generally speaking, when the coarse grinding is given priority to with the cutting; When the fine grinding both cutting effect, and the friction polishing effect; Super fine grinding and mirror grinding polishing effect is more apparent when the friction.