Super finishing can generally be divided into three stages: cutting stage, half cutting stage, light the whole stages.
(1) cutting stage
Millstone surface and rough groove surface convex peak at contact, because the contact area is lesser, the pressure on unit area is larger, in certain pressure effect, the first being the "against cutting" effect, make millstone surface part of the grits and chipped off, exposing some new sharp grits and edge. At the same time, the surface by convex peak fast cutting, by cutting and cutting the role on the surface of workpiece remove protruding peak and grinding badness layer. This phase is called cutting stage at this stage, removed the most of the metal residue.
(2) half cutting stage
Along with the processing of continued, the surface is gradually wear away. At this time, and the surface of the contact area increased, the pressure on unit area is reduced, cutting depth decreases, and cutting decreased ability. At the same time, the surface of the porosity blockage of stone, stone cutting state in half. This phase is called half cutting stage, cutting in half the surface traces cutting stage becomes shallow, and appear darker luster.
(3) light the whole stages
This is the final phase of super finishing. Along with the surface of workpiece is gradually to wear away, millstone and the surface contact area further increases, and, millstone and the surface is gradually between the oil film of isolation, the pressure on unit area is very small, has not bring the millstone self sharpness, cutting function decreases, and finally tend to automatically stop cutting. This phase is called light the whole stages. Light the whole work surface no cut trace stage, a general luster.
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