基于可靠性分析的主轴优化设计

Optimization Design of the Spindle Based on Reliability Analysis

基于Workbench软件对加工中心主轴静刚度进行研究。在静力学分析基础上,以主轴质量为约束条件,对主轴进行了静刚度优化设计;在考虑主轴尺寸、载荷、材料性能以及轴承刚度等参数随机分布的情况下,利用概率统计的思想对优化后的主轴进行了six sigma可靠性分析。结果表明,优化后主轴刚度提升17.5%,满足使用要求;可靠性灵敏度分析表明外载荷、轴承刚度以及主轴外径的随机变化对主轴刚度影响较大;优化后的主轴可靠度达到100%,安全可靠。

The static stiffness of a machining center's spindle was studied based on Workbench software. The static stiffness of the spindle was optimized on the basis of statics analysis,with the spindle quality as constraint condition. The six sigma reliability analysis of the optimized spindle was carried out using the ideas of probability and statistics,which considered the random distribution of geometrical dimensions,external loads,material characteristics and bearing stiffness. The results show that the spindle stiffness could satisfy the using requirement and its stiffness increased by 17. 5% after optimization. Reliability sensitivity analysis showe that the random variation of external loads,bearing stiffness and the spindle diameter has a great influence on the spindle stiffness. The spindle is safe and reliable after optimization with its stiffness reliability is 100%.