INFLUENCE OF THE CHARACTERISTICS OF TOOL HOLDERS ON THE SURFACE QUALITY IN HIGH-SPEED BALL END MILLING OF ALLOY TOOL STEEL

摘要

This paper deals with the experimental evaluation about the characteristics of tool holders in high-speed machining of alloy tool steel by using a vertical MC. The research purpose is to clarify how the characteristics of MC spindle, tool holder, and tool affect the machined surface in high-speed milling. After evaluating both static and dynamic characteristics for different tool holders, cutting tests of alloy tool steel SKD61 at HRC50 were carried out by using ball end mill. Cutting speed and feed-rate were 358 m/min and 3,800 mm/min respectively and the machined surfaces were measured to compare surface roughness, waviness, and form accuracy. As the results, it was probed that the difference of surface quality appears clearly by the characteristic differences among tool holders even if the cutting conditions were the same.