超音波振動切削における切削機構に関する研究(第1報) : 相対切削速度の変動と切りくず生成過程のシミュレーション解析

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In this report, the remarkable features in the ultrasonic vibration cutting was extracted from the view point of relative cutting speed between the tool and the work piece, then the chip forming process considering this feature was simulated by using the finite element method. As first, the existence of the transitional cutting speed was shown. When the steady cutting speed is lower than the transitional cutting speed, the maximum relative speed, which is the sum of the steady feed speed and the maximum vibration speed of tool, cannot be obtained in the real cutting term. In this case, the relative cutting speed is the highest at the moment of tool-chip contact in the cycle of vibration, and then it becomes lower in the cutting term. Secondly the deformation process in the ultrasonic vibration cutting, which is an interrupted cutting process and the relative cutting speed varied largely during the 1 period of vibration, was analyzed by thermo elastic-plastic finite element method. The chip forming process was shown from the strain rate distribution in the deformation zone. It was also shown that the cutting force acting between tool-chip and the temperature rise are almost same in vibration cutting and conventional cutting, if we assume that the frictional characteristic and the flow stress are the same in conventional cutting and vibration cutting.
2004-04-05