Abstract
This paper deals with the life of various tools to clarify the machinability and optimum tool materials in cutting of sintered carbons with high hardness. Furthermore, the behaviors of the tool wear are discussed from the view points of cutting forces, chip geometries, surface roughness and vibration characteristics, such as cutting frequency and amplitude in chatter vibration cutting. The obtained results are as follows. (1) The tool is worn by the abrasive action in cutting of sintered carbons. Particularly, CBN and ceramic (black) tool are worn. Sintered carbide (K grade) and sintered diamond tool have a long life in tool materials used. (2) A decrease of the wear rate of the tool relief face in chatter vibration cutting and in increasing of the cutting speed depends on a decrease of the contact number between tool and work and an increase of relief angle, which is varied by vibration characteristics.
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