高转速下主轴-双面锁紧刀柄接触特性预估
Contact Characteristic Prediction of Double-Locking Toolholder-Spindle System at High Speed

采用有限元方法获得不同转速下端面和锥面的接触压强，基于该压强采用三维分形和赫兹接触理论计算双面锁紧刀柄与主轴的接触刚度，建立高转速下主轴-双面锁紧刀柄系统仿真模型。分析不同参数对主轴-双面锁紧刀柄(BTF40)系统锥面接触率及结合部接触刚度的影响规律，确定了该新型刀柄的极限转速、拉刀力、碟簧刚度和碟簧预紧力的合理取值区间，研究结果为双面锁紧刀柄的设计与优化提供了理论依据。
The finite element analysis is applied to obtain the contact pressure of the contact surfaces at different speed. Based on the three-dimensional fractal model and Hertz theory the contact stiffness of the double locking toolholder-spindle system is obtained, then the simulation model is built to obtain the contact characteristic of the system at high speed. Based on the theoretical model the influences of the different parameters on the taper-surface contact ratio and the contact stiffness are revealed. Finally, the upper limit of the speed and the reasonable ranges of the draw-bar force, disk-spring stiffness and pre-tightening force are defined. All the research results will be a good theoretical basis for the structural design and optimization of the double-locking toolholder-spindle system.