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This paper describes a study concerning the influence of plastic deformations on the cutting zone at the plain turning with small cutting feeds. It notes that in the field of cutting feeds, the real roughness is much greater than the geometric roughness because of high plastic deformations that appear in the cutting zone. The determined coefficients are parameters which evaluate the deformability in the cutting area, therefore allow the establishment of material machinability in the small cutting feeds.

ASSESSMENT OF PLASTIC DEFORMATION IN THE CUTTING ZONE AND CORRELATION WITH ROUGHNESS, AT PLAIN TURNING WITH SMALL CUTTING FEEDS