磁性流体による工作機械主軸のリアルタイムバランシング (第2報)

—リアルタイムバランシング機能を検証する工作機械主軸の開発—

抄録

A machine tool spindle is a key component affecting the performance of machine tools. Spindle vibration of machine tools causes short tool life and low machining accuracy. The vibration changes depending on the used tooling and the rotation speed during various machining operations. In particular, even small unbalance mass of the spindle makes large centrifugal force in high speed machining. However, real-time balancing for a machine tool spindle has not yet been realized successfully including the influence of the used tooling. In the previous paper, in order to compensate unbalance mass of a machine tool spindle and to achieve high accuracy machining, a real-time balancing mechanism using magnetic fluid was proposed. The magnetic fluid is enclosed inside the spindle, and the distribution of circumferential mass is controlled to compensate for unbalance mass in real-time. A machine tool spindle equipped with the proposed real-time balancing mechanism is developed in this paper. It is experimentally confirmed that unbalance mass of the spindle is significantly improved in real-time, and tool vibration is suppressed effectively.