摘要
采用有限元法求解静压气浮主轴内气体流动雷诺方程,计算主轴承载能力、刚度和高度角等稳态性能,研究平均气膜厚度、偏心率、转速不同时直径系数(相邻节流孔直径比)和分布系数(相邻节流孔间隔比)对主轴稳态性能的影响。结果表明:直径系数减小或分布系数增大,承载能力和刚度增大而高度角减小;直径系数和分布系数不变,增大平均气膜厚度,承载能力和刚度减小,高度角先减小后增大;偏心率越大,承载能力越大,刚度越小;转速增加,高度角增大。较小的直径系数和较大的分布系数有利于提高主轴承载能力和刚度,降低高度角;较小的平均气膜厚度有利于提高主轴的承载能力和刚度,较大的偏心率主轴承载能力提高而刚度降低。
Finite element method was used to solve the Reynolds equation of the gas flow field in aerostatic spindle and the steady performances were calculated such as load capacity,stiffness and height angle.Moreover,the effects of average airfilm thickness,eccentricity,orifice diameter factor(ratio of adjacent throttle diameters)and orifice distribution factor(ratio of adjacent throttle intervals)on the steady performances were studied.The results demonstrate that load capacity and stiffness decrease while height angle increases with the growth of orifice diameter factor;load capacity and stiffness increase while height angle decreases with the increase of orifice distribution factor.Further,load capacity and stiffness decrease and height angle decreases firstly then increases with the increase of average airfilm thickness if orifice diameter factor and orifice distribution factor are constant.The larger the eccentricity is,the higher the load capacity is and the smaller the stiffness is.Height angle increases with the growth of rotational speed increases.It is helpful for increasing load capacity and stiffness and decreasing height angle if the spindle with small orifice diameter factor and large orifice distribution factor.It has large load capacity and stiffness if the spindle with small average airfilm thickness.Larger eccentricity increases spindle load capacity and reduces stiffness.
作者
马城辉
王鹏峰
朱远哲
高翔
李孝禄
李运堂
MA Chenghui;WANG Pengfeng;ZHU Yuanzhe;GAO Xiang;LI Xiaolu;LI Yuntang(College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou Zhejiang 310018,China;College of Modern Science and Technology,China Jiliang University,Hangzhou Zhejiang 310017,China)
出处
《机床与液压》
北大核心
2023年第20期9-16,共8页
Machine Tool & Hydraulics
基金
浙江省自然科学基金重点项目(LZ23E050002)
国家自然科学基金面上项目(51675498)
浙江省属高校基本科研业务费专项资金(2020YW29)。
关键词
静压气浮主轴
有限元法
直径系数
分布系数
稳态性能
Aerostatic spindle
Finite element method(FEM)
Diameter factor
Distribution factor
Steady performances
