螺杆转子磨床砂轮架的动态特性分析与优化

Dynamic Characteristics Analysis and Optimization of Screw Rotor Grinder's Grinding Carriage

以高精度数控螺杆转子磨床砂轮架为研究对象,利用ANSYS Workbench有限元分析软件对其进行了模态分析和谐响应分析,获得砂轮架的前六阶固有频率和振型,识别出砂轮架的薄弱环节,并验证了砂轮架能够成功克服共振。在此基础上,以提高砂轮架低阶固有频率和降低总质量为优化目标,提出了三类改型方案,采用方案对比优选的方法确定综合方案,并通过静力分析验证了综合方案的可行性。结果表明:与原结构相比,优化后砂轮架的一阶固有频率提高了8.63%,同时总质量减轻了8.84%,达到了较好的优化效果,为砂轮架结构的改进优化提供了理论参考依据。

Taking the high precision NC screw rotor grinder＇s grinding carriage as the researching object,the modal analysis and harmonic responses analysis are made by ANSYS Workbench finite element analysis softw are.The first six orders of natural frequency and mode shapes are obtained,the w eak points of grinding carriage are identified,and it is verified that the grinding carriage could successfully overcome resonance.Then,three retrofit schemes are presented w ith increasing grinding carriage＇s low order natural frequency and decreasing total quality as optimized object.The optimal scheme is confirmed by the method of comparison optimized schemes,and the feasibility of the optimal scheme is verified through the structure static analysis.The results show that,compared w ith the original structure of the grinding carriage,the first-order natural frequency increases 8.63%,w hile the total quality decreases 8.84%.This study achieves good effect,and provides the theoretical reference for the optimization of grinding carriage structure.