高速静压内置式电主轴系统稳定性分析及优化

Stability analysis and optimization for a high-speed built-in motorized hydrostatic spindle system

针对高效精密机床电主轴系统的高速化,讨论液体静压主轴系统失稳机理,并对高速静压内置式电主轴系统进行稳定性分析;提出基于遗传算法的电主轴系统稳定性优化方法。以系统稳定性评价指标为优化目标、电主轴系统轴向尺寸参数为设计变量,采用高效微型遗传算法实现电主轴系统稳定性优化。该方法既能高效解决增强轴系稳定性优化问题,又可避免复杂结构参数修改;通过某高速磨床静压内置式电主轴系统稳定性分析及优化对该方法进行验证。结果表明,稳定性分析及优化后系统稳定性得到明显提高。

Aiming at the high speed trend of high precision machine tool spindle systems,to study their stability in design process becomes very important. Firstly,the instability mechanism of a hydrostatic spindle system was discussed and the stability of a high-speed built-in motorized hydrostatic spindle system was analyzed. Then,an optimization method named the mirco genetic algorithm for stability of a motorized spindle system was proposed based on the genetic algorithm.The objective was to maximize the stability evaluation index of the system and the axial size parameters of the spindle system were taken as the design variables. The effective micro genetic algorithm was adopted for the stability optimization of the spindle system. Eventually,higher stability was achieved,the modification of the parameters of complex structure was avoided. As an example,the stability of a high-speed grinder motorized hydrostatic spindle system was analyzed and then optimized using this optimization method. The results indicated that the stability of the motorized spindle system can be improved obviously with the proposed method.