高硬度材の高速エンドミル加工に関する研究(第2報) : 空気軸受主軸を搭載した加工機械と転がり軸受主軸を搭載した加工機械の比較

概要

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This study deals with the technology of high speed end milling of hardened steel by a high speed milling machine with an air bearing spindle. In a previous paper, it was shcnln that use of such machine enables stable machining to be carried out. Nowadays most of high speed milling machines are equipped with ball bearing spindles . But basic feature differ-ences of high speed end milling of'hardened stcel when using air bearing spindle and ball bearing spindle, have, not been clarified. In this paper, static and dynamic stiffnesses of high speed milling machines with a different type of spindles are discussed. Basic features of high spid end milling of hardened steel , vibrations , surface roughness and tcol lives are als6 discussed. The main results are as follews : ( I ) The static and dynamic stiffnesses of the air bearing spindle and the ball bearing spindle are obtained by experiments . ( 2 ) The features of high speed end milling are obtained by experiments for each type of spihdle machines. ( 3 ) In a high speed milling machine with an air bearing spindle, the stsatic and dynamic stiffnesses are lower than those of a machine with a ball bearing spindle. But under ccmparatively high spindle speed conditions , tcol lives are longer and surface roughness are better than those in case of a ball bearing spindle machine .
1999-02-05