高剛性総形心なし研削盤開発に関する研究 : びびり振動の抑制に及ぼす影響(機械要素,潤滑,工作,生産管理など)

概要

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In centerless grinding of large dimensioned workpiece, two serious problems to be solved are, firstly, chatter vibrations originated in dynamic stiffness of grinding system, and secondly, copying accuracy of generator profile between master cam and workpiece. A new centerless grinding machine is designed and built recently based on new design concept. That is the combination of load compensated positioning mechanism and plain bearing guideways for high stiffness and accuracy in feed direction. Another one is application of stationary spindle structure for both wheels which assures high dynamic stiffness. The results obtained are summerized as follows : Copying accuracy of master cam to workpiece is around 0.2 μm/200 mm. 50 mmdia×200 mm length workpiece is ground without chatter, achieving roundness of 0.2〜0.3 μm. Chatter analysis assures the new machine of absolute stability under usual grinding condotions, and simplified criterion for absolute chatter free grinding is shown.
2003-04-25