デュアルアクチュエーションによるNC工作機械送り系の振動制御(第1報) : 相対速度フィードバックによる2慣性系の減衰制御

概要

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High speed feed drives are being introduced to machining centers for aiming high speed and high productive machining. High lead ballscrew drives are generally used in practical applications, as they are cost-effective and robust to disturbances such as cutting forces. However, ballscrew drives suffer from vibration due to low damping of ball or roller guideways which are commonly used in high speed feed drives. This paper deals with a dual actuation drive, which has direct actuators in the drive table as well as conventional ballscrew drive mechanism. In this actuation system, relative velocity feedback (RVFB) controllers are investigated to give the adequate damping for servo system. By using modal analysis, RVFB gain can be interpreted as damping ratio of 2 mass vibration system. Three types of RVFB are analyzed and compared to direct velocity feedback (DVFB) theoretically. The damping control performance is examined by numerical simulations and experiments, which have good agreement with the theoretical analysis.
社団法人精密工学会の論文
2003-03-05