The distribution curve of surface unit was obtained here. The type of the distribution curve depends on the material and the method of surface processing, that is, when the method of surface processing is controlled, the characteristics of the distribution curve of the surface unit is settled.
Some of them show normal distribution, some do not, though certain regularity can be observed.
This allows us to estimate the distribution of surface unit of unknown surface by means of sampling, and will act as a guide to solve problems on wear, contact, machining and statistical quality control of surface finishing.
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