A study of influent factors in surface quality of hard turning

This object of this research was to study factors influencing on surface quality of hard turning by comparing the surface quality of cutting work. Material used in the experiment was a hardened main shaft SCM4, which had hardness form 52 to 56 HRC. The experiment was run by factorial design, which consisted of feed rates, depth of cut and cutting speed. The cutting tools were CBN-tipped cutting inserts and conventional machine was used. Results revealed that an influential factor was feed rate, which was significantly influent to surface quality at the level of 0.05. Low feed rate could cause less roughness, but higher feed rate could cause greater roughness. The relationship between feed rate and depth of cut was not affected to surface quality. Predicted roughness of surface by regression equation was showed the relationship between feed rates and roughness of surface on hard turning work.