マシニングセンタ用高速主軸の回転中の振れと振動の抑制

3面バランス修正の効果

抄録

In this paper, a method for reducing the run-out and vibration of high speed spindles of machining centers is experimentally investigated. In the experiment, the run-out and vibration of a conventional spindle designed by one of authors have been measured by using two displacement sensors and a field balancer with two accelerometers. It is found from the experimental results that both of them can not be reduced at the same time. To overcome the problem, a new unit with a shorter spindle than the conventional one has been developed. The modified spindle unit was designed for high speed and high precision machining centers. This unit has three balancing planes to reduce the run-out and vibration due to the unbalance mass. Two balancing planes are arranged on both ends of spindle, and third one is arranged near to the rotor of motor between two support bearings. Using the modified. spindle unit, the run-out and vibration have been investigated. It is confirmed that the proposed method is useful to reduce the vibration and run-out at the same time. It is also found that a high speed spindle for machining centers should be considered as a flexible rotor system rather than a rigid one.