Surface roughness and work hardening in hot machining

概要

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In this report, surface roughness, tool wear and work hardening when carbon steel, 18-8 stainless steel and 13 Cr stainless steel were cut with ceramic tool under Local Electric Resistance Heating are shown. The results of these experiments are as follows: Case of carbon steel. (1) Until cutting speed exceeds the speed of 160 m/min, we can expect to have surface roughness of better quality under or by this hot machining method than under or by conventional machining. (2) At a higher cutting speed than 220 m/min, surface roughness obtained remains the same whether electric current is used or not. (3) When the depth of cut is large, better surface roughness can be obtained by increasing cutting speed. (4) The most hardened layer generated by repeating contact stress exists in about 0.2 mm below the contact surface. Case of 18-8 stainless steel and 13 Cr stainless steel. (1) A better surface roughness is expected of both of work materials when this method is used. (2) When this method is used, cratering for 18-8 stainless steel decreases. But for 13 Cr stainless steel, cratering little decreases. (3) When machining both of work materials with ceramic tool, cutting speed must be kept at a higher point than 100 m/min.
山口大学の論文