Theoretical analysis and experimental study of offset error of ultra-precision micro-spindle caused by cutting load
Theoretical analysis and experimental study of offset error of ultra-precision micro-spindle caused by cutting load
复制标题
切削载荷引起超精密微主轴偏置误差的理论分析与实验研究
DOI：
10.1080/14484846.2019.1601665
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发表时间：
2019-04
影响因子：
1.4
通讯作者：
Ren Yinghui
中科院分区：
文献类型：
--
作者：
Li Wei;Liu Hui;Liu Xiaoman;Ren Yinghui
摘要 现有超精密微主轴由于径向误差较大，无法达到亚微米级精度的加工要求。本研究建立了超精密微主轴切削载荷引起的径向偏置误差的计算模型，并进行了算例设计。研究发现，刀尖偏置量随着刀具悬伸长度的增加而增大，随着主轴转子跨度的增大而减小。轴承刚度对刀尖偏移的影响最大，其次是刀具偏转变形，主轴转子偏转变形对刀尖偏移的影响最小。推力轴承在一定程度上抑制了刀具偏置误差的增大。空气静压轴承由于轴承刚度小，在切削载荷作用下，支承中心发生偏移。最后在原型微主轴上进行了测试，验证了所建立模型的合理性。
ABSTRACT The existing ultra-precision micro-spindles fail to achieve the machining requirement of sub-micron precision because of its large radial error. In this study, the calculation model of radial offset error caused by cutting load is established for ultra-precision micro-spindle and an example design is carried out. The study finds that the offset of the tool tip increases with the increase of tool overhanging length and decreases with the increase of the span of spindle rotor. Bearing stiffness has the greatest effect on the tool tip offset, followed by the tool deflection deformation while the deflection deformation of spindle rotor has the smallest effects on the tool tip offset. The thrust bearing restrains the increase of tool offset error to some extent. The supporting centre of the aerostatic bearing shifts under the acting of cutting load due to its small bearing stiffness. Finally, the testing was conducted on a prototype micro-spindle, which shows the rationality of the established model.
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期刊：
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