タップ加工用知能化工作機械システムに関する研究(第2報) : 適応制御によるタップ折損防止と加工能率の向上

概要

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This paper presents a method of adaptive control of tapping in order to perform high speed, high productivity tapping by using newly developed intelligent machine tools experimentally. Generally the adaptive control is changing of cutting condition like feed rate and cutting speed. For tapping, it is not enough to avoid troubles that control cutting condition as compared with the other machining modes like drilling and milling. Because feed rate is fixed for pitch of tap, and to control cutting speed is not so effective. This method means changing acceleration speed of tapping by means of the value of cutting torque by monitoring cutting force with internal sensor. To use this method, the cutting torque increase is not so sharp at the hole bottom vicinities because of prevention of chip jamming. In order to inspect the productivity and safety of tapping, a new NC system produced. As a result, productivity improved 34% experimentally as compared with conventional system. So it is able to have high-efficiency machining without tool breakage in tapping.
公益社団法人精密工学会の論文
2001-08-05