Developing Ball Screw Drive System of High speed Machine Tool Considering Dynamics

In order to provide guidance and reference for developing ball screw drive system of high speed machine tool, this paper investigates three basic issues with consideration of dynamics, including mechanical characteristics, inertia matching problem and driving torque characteristics. The axial stiffness and natural frequency of system are firstly calculated to verify the correctness of mechanical parts selection, and the stability of system is ensured by designing appropriate gain. Next, the inertia matching problem between servo motor and load is analyzed based on two-inertia-system, and the range of inertia ratio is determined as an important principle when developing ball screw drive system. The speed-torque characteristics are further discussed, and a graphical method is proposed to quickly and accurately determine a suitable servo motor. Finally, a complete flow is described, and the ball screw drive systems of a high speed machine tool for aero-engine casing manufacturing are developed as an application. The actual test results of speed, accuracy, cutting ability and machining performance indicate that the developed ball screw drive systems have satisfactory performance, which validate the effectiveness of the comprehensive study.