三支承车床主轴的刚度及参数优化

Stiffness calculating of a three point supported spindle of machine tool

对三支承车床主轴从辅助支承发生作用的条件出发,假设3个支承在载荷作用下的变形呈线性关系,由此对辅助支承约束力求解,从而将超静定问题转化为静定问题,得到了主轴端部柔度(刚度的倒数)计算公式,然后根据主轴部件设计的需要,采用遗传算法对主支承跨距、辅助支承跨距和传动力作用位置等参数进行综合优化,对三支承结构的机床主轴设计有一定的参考意义。

Aimed at the machanics model on three point supported spindle of machine tool,start from the working condition of assistant bearing,supposing that deformations of three bearing are linearity,to obtain the sanction solution of assistant bearing,translate the statically indeterminate problem into a statically determinate problem,and the expressions flexibility of spindle end is given out.And then,influence factors such as bearing span,assistant bearing span and driving force action location have been synthetically optimized to get higher spindle stiffness.That will be effective for machine tool three point supported spindle system design.