Influence Of The Technology Of Driven At Center Of Gravity (dcg) And The Combined Interface Parameters To The Dynamic Performance Of Machine Tool

The high speed and high precision technology of NC machining plays a very important role in the field of machining, and the feed drive of high speed is one of the key technologies in it. Driven at Center of Gravity (DCG) is an innovative feed drive method for machine tool, and it can increase the motion velocity and accuracy of machine tool effectively but the research on it is still in an infancy stage. In this paper, the box in box structure of MCH63 precise horizontal machining center is studied, which is based on double-driving synchronously and driven at center of gravity technology (DCG). The DCG structure is theoretical and experimental analyzed. The influence parameters to dynamic performance of DCG structure are analyzed. The contents include as follows:(1)The DCG structure dynamic model is established and the influence parameters to dynamic performance of DCG structure are analyzed. The parameters include rolling guide-slider topological structure, the distance between driving force and structure gravity center, and the dynamic parameters of rolling guide-slider combined interface: stiffness and damping.(2)The dynamic parameters of rolling guide-slider combined interface, stiffness and damping, is identified in a modal experiment.(3)The DCG structure dynamic parameter model is established in ANSYS Workbench Environment and the influence of rolling guide-slider topological structure to the DCG structure dynamic performance is simulated and analyzed in frequency domain. The analysis result indicated the design principle of rolling guide-slider topological structure is bigger distance between guides should be adopted.(4)By means of virtual prototype technology, the CAD software SolidWorks, dynamic analysis software RecurDyn and FEM software ANSYS are utilized to establish a virtual simulate environment. In this simulate environment MCH63 precise horizontal machining center single driving and double driving rigid and flexible coupled multi-body system dynamic models are established. And according to real machining conditions of machine tool, the influence to DCG structure dynamic performance by the distance between driving force and structure gravity center and the dynamic parameters of rolling guide-slider combined interface, stiffness and damping, are simulated and analyzed in time domain.