Performance analysis of aerostatic journal micro-bearing and its application in high-speed precision micro-spindles
This study comprehensively investigates the effects of restriction, structure and operation parameters on the performance of aerostatic journal micro-bearing using modified numerical models.The numerical models are verified on a prototype aerostatic journal beating.Considering both the performance requirement and current machining capacity, the restriction parameters of 8-12 μm in average bearing clearance and 0.08-0.14 mm in orifice diameter are recommended.Another focus of this study is the aerodynamic pressure effect on the performance of micro-bearing, which is thoroughly investigated from the aspects of restriction, structure and operation parameters.The aerodynamic pressure effect is outstanding only at ultra-high speeds and large eccentricities.Two prototype high-speed precision micro-spindles are developed and their micro-tools with a diameter of 3.175 mm are directly supported by the micro-beating.The aerodynamic pressure effect resulting from ultra-high rotational speeds can improve the performance of micro-spindles under load.However, the low machining accuracy and balance quality limit their performance.
Micro-bearing Aerostatic pressure Aerodynamic pressure load capacity Micro-spindle
Wei Li Hang Xiao Zhixiong Zhou Xiangming Huang Yinghui Ren
College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
国际会议
上海
英文
35-38
2017-11-19（万方平台首次上网日期，不代表论文的发表时间）