机械科学与技术2012，Vol.31Issue(12)：2023-2027,5.
交叉杆并联机床驱动力为零对加工精度影响的分析
Effect Analysis of Zero Drive Force of a Cross-legged Parallel Machine Tool on Machining Accuracy
摘要
Abstract
Machining accuracy of cross-legged parallel machine tool of zero drive force was investigated. Dynamic equation of a cross-legged parallel machine tool was obtained by Newton-Euler approach. Drive force of a leg was solved by the dynamic equation. The effects of clearance between a screw and a nut on machining accuracy were analyzed. The results show that if there is clearance between a screw and a nut, machining accuracy of a cross-legged parallel machine tool will be affected near the zero drive force posotion of a cross-legged parallel machine tool. Machining accuracy of a cross-legged parallel machine tool is not affected by a preload screw nut, but power consumption and wear of screw pair is increased. A preload mechanism of a screw nut is redundant in a cross-legged parallel machine tool which often works under non-zero drive force condition. It was expected that machining time of a cycle process is controlled in order that a cross-legged parallel machine tool does not have the position of zero drive force. A preload mechanism of a screw nut was set and used accordin~ to critical machining time.关键词
并联机床/加工精度/驱动力为零/间隙/临界加工时间Key words
parallel machine tool/machining accuracy/zero drive force/clearance/critical machining time分类
机械制造引用本文复制引用
许兆棠,刘远伟,孙全平,陈小岗,陈前亮..交叉杆并联机床驱动力为零对加工精度影响的分析[J].机械科学与技术,2012,31(12):2023-2027,5.基金项目
江苏省高校自然科学研究重大项目（12KJA460001）和江苏省数字化制造技术重点实验室开放课题项目（HGDML-0611）资助 （）
