Study On Static And Dynamic Performance Of Machine Tool's Spindle Assembly

High-speed and high-accuracy are the trends in development of machine tool, we need to use advanced and appropriate method to design machine tool. As a way to improve enterprise's competitive power, the dynamic design method has been played an important role. The analysis of dynamic performance is the premise of dynamic design. Spindle assembly is a key part of CNC machine; its performance will affect the machine's performance and quality of workpiece mostly.To improve design level and use advanced design method, we cooperate with Shenyang No.1 Plant of Machine Tools to do study on dynamic performance and application. The paper is based on the study and the mainly work is study on dynamic performance of Machine Tool's Spindle Assembly which can provide a foundation for dynamic design. The contents are:(1) In the paper, the development trends of machine tool and dynamic design are summarized. And the FEA and mathematical model methods are taken to use.(2)The paper does discussion stiffness of bearing and obtains a way to calculate static stiffness. Then the dynamic stiffness is analyzed.(3)The basic resolving processes about static analysis and kinetic analysis next. The solid models of spindle and spindle assembly are established. During the building of the model, the load on the spindle, the supporting stiffness of bearing, the boundary and elements are analyzed correctly.(4)The mathematical model method is introduced. Then the spindle assembly is analyzed by transfer matrix method. The result is compared with result of FEA.(5)The calculate of proper span and its influence to dynamic performance. At last, the paper takes a CNC lathe CKS6125 produced by Shenyang No.l Plant of Machine Tools as subject investigated including static rigidity and shock excitation...