高精度内圆磨床结构动态优化设计研究

机床动态优化设计是提高机床加工精度的有效途径。建立了内圆磨床动态优化设计流程，利用灵敏度分析方法，分析了部件筋板布局形式和筋板参数对动态性能的影响。利用模态频率修正技术，考虑部件结构优化时，各部件之间模态频率的分离。部件优化后组成的新磨床与原磨床相比，其第1阶整机固有频率提高17％，对应的第1阶段率的磨头与工件间的振动相对位移量降低10％以上，提高了机床的加工精度，增强了产品的竞争力

Research on Structure Dynamic Optimization Design of High Precision of Internal Grinder

Dynamic optimization design of a machine tool is the key issue to improve machining precision of the machine tool. In this paper the dynamic design flow of an internal grinder is established, and the effects of arrangement shapes and parameters of the strengthened bars of components on dynamic characteristics are analyzed by sensitivity analysis. To keep frequency separation of components one another, the technique of mode frequency separation was applied while the structure of components was optimized. The result of dynamic optimization design shows that the first order natural frequency of the new internal grinder raises 17% compared with the original one, while the relative vibration displacement between head of the grinder and the work piece reduces 10% correspondingly, which assures machining precision and strengthens the ability of market competition of products in the long run.