超音波振動切削における切削機構に関する研究(第3報) : 加工雰囲気による潤滑状態の変化

概要

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The effect of machining atmosphere in ultrasonic vibration cutting on the cutting force and chip formation was studied in this report. Some vibration cutting experiments have been conducted under the several kinds of atmosphere such as the air, inert nitrogen gas, cutting oil and oil-mist supply. In order to vary the gap size between tool rake face and the chip in each vibration cycle, newly proposed cutting experiment using resonated-horn-type work piece was used. The displacement amplitude and stress amplitude at the cutting point can be varied continuously in this device. From the viewpoint of the smoothness of the chip surface, the lubricating property at tool-chip interface seems better in the air than in the nitrogen atmosphere when ultrasonic vibration cutting was conducted. But absolute decreasing of the cutting force by the lubricating effect was smaller than that by the effect caused by the dynamic response of high-cycle vibration. Also it was shown that the cutting force reduction ratio by using the oil or oil-mist was 60% to 75% even if the vibration was applied or not. On the other hand, the amount of the contribution for the dynamic cutting force reduction can be larger than the effect of the lubrication and it can be varied by changing the vibration and cutting conditions.
2005-08-05