Abstract
Generally, camshafts used in automobile engines are firstly made by forging or casting processes and then turning process is applied to remove a rough layer on the work materials as cast or forged. This process contains relatively harder conditions for cutting tool because of the unstable intermittent cutting derived from the eccentricity in shape and/or lack of uniformity of the work material microstructure. Thus the productivity in camshaft machining is limited in production time, tool life and surface quality of machined surface. In this study, cutting force analysis in rough turning of camshaft was performed. High-speed movie was successfully captured the transition from unstable interrupted cutting into stable continuous cutting, and the tool-work rubbing phenomena was observed after stop the feed. The amplitude of vibration in cutting and thrust forces were about 300N and 250N respectively, and rubbing forces were 200N and 80N respectively after stopping the tool feed. This rubbing may affect the tool life greatly, NC program was suggested to be modified at the machine shop in automobile factory.
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