关键词: 高速主轴系统;主轴-刀柄-刀具结合部;切削稳定性;影响因素

Abstract: The stability of high-speed spindle system affects the surface finish and the tool life directly, which is an important factor to evaluate the performance. It is concerned to research the influence factors and make a reasonable approach of improving the stability. Starting from the stability evaluation criteria and different ways of getting FRF, the influence factors of unconditional and conditional stability regions including motivation, speed and spindle system structure are analyzed. Taking GMN spindle as sample, the whole high-speed spindle system finite element method is modeled with five degrees model of angular contact ball bearing taking the force and deformation in consideration and distributing spring model of spindle - holder - tool joints. The influence laws of cutting force amplitude, speed and damping ratio towards cutting stability are characterized by the three dimensional lobes, limit cutting depths and lobe intersections changing with the parameters, which provide the theoretical basis for optimizing the processing and improving the cutting stability.

Key words: Cutting stability, High-speed spindle, Influence factor, Spindle-holder-tool joints