The Study Of High-speed Toool System With The Function Of Dynamic Compensationg For Centrifugal Expansion

Tool system for high-speed machining is a necessary condition to achieve the high-speed machining, the performance of tool system for high-speed machining directly determine the quality, efficiency and reliability of the high-speed machining. There is a problem of the current tool system for high-speed machining, the radial separation appears at toolholder/spindle interface at high speed. This problem seriously affect the connection reliability of toolholder/spindle interface and restrict the improvement of speed. In order to solve this problem, a dynamic compensation system is designed which clamps the tooholder by using Centrifugal force. By using theoretical calculation method and finite element method, analyse the connection performance of this dynamic compensation system, and analyse the effect of this dynamic compensation system on the static and dynamic characteristic of spindle. As follows:The whole structure of the dynamic compensation system is designed, and the design of the cylinder assembly and the expansion sleeve is accomplished by using theoretical calculation method and finite element method.Establish the theoretical model of toolholder/spindle interface according to elasticity theory, and analyse the connection performance of toolholder/spindle interface theoretically. Analyse the connection performance of dynamic compensation system by using finite element method, and define the limit speed of the dynamic compensation system.Analyse the effect of this dynamic compensation system on the static and dynamic characteristic of spindle, obtain the static stiffness, natural frequencies and mode shapes of spindle. By co-simulation, analyse the vibration characteristics of spindle, obtain the influence of piston vibrator and liquid damping on the vibration characteristics of spindle.Analyse the dynamic balance characteristics of spindle theoretically, define the pre-compression amount of piston on the basis of dynamic balance requirement.The results of this study can provide reference for the development and design of new high-speed machining tool system partly.