Chatter stability analysis in Micro-milling with aerostatic spindle considering speed effect

被引：26
|
作者：
Shi, Jianghai [1 ]
Jin, Xiaoliang [2 ]
Cao, Hongrui [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Xian 710049, Shaanxi, Peoples R China
[2] Univ British Columbia, Dept Mech Engn, 2054-6250 Appl Sci Lane, Vancouver, BC V6T 1Z4, Canada
来源：
MECHANICAL SYSTEMS AND SIGNAL PROCESSING | 2022年 / 169卷
基金：
中国国家自然科学基金; 加拿大自然科学与工程研究理事会;
关键词：
Chatter stability; Aerostatic bearing spindle; Dynamics analysis; Speed effect; Micro-milling process; END MILL; SUPPRESSION; INSTABILITY; DESIGN;
D O I：
10.1016/j.ymssp.2021.108620
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The regenerative chatter is one of the fundamental obstacles in high-speed micro-milling process, which causes tool wear and poor surface quality. In order to predict the chatter stability of micro milling with aerostatic spindle more accurately, the effects of rotating speed on the dynamic stiffness and damping coefficients of aerostatic journal bearing are investigated firstly. The frequency response functions (FRFs) of aerostatic spindle under different rotating speeds are calculated considering the speed effect of aerostatic bearing, centrifugal force and gyroscopic moment. A method for calculating the stability lobe diagram (SLD) of micro-milling considering the speed effect is proposed in this paper. The speed-dependent SLD is simulated based on tool tip FRFs under different rotating speeds and is verified by micro-milling of aluminum 7075. In addition, the effects of supply air pressure and air film thickness on the SLD are investigated comprehensively. The results provide guidance to improve the chatter stability and cutting efficiency in micro-milling with aerostatic spindle.
引用
收藏
页数：21
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