基于Hyper Works的6杆并联机床的优化设计

针对并联机床加工过程中发生共振导致机构变形进而影响零件加工精度的问题,文中以6杆并联机床为研究对象,采用拓扑优化的方法对并联机床床身进行优化。首先确定床身的优化部位为立柱、横架和定台,运用HyperWorks中拓扑优化模块对其优化,通过添加一定的加强筋来整修优化立柱和横架,对立柱的筋板尺寸进一步优化。优化后运用模态分析和谐响应分析进行整机验证,对比优化前后模型,发现优化后的模型总质量减少了17.8%,前三阶共振频率分别增加了19.56%、20.62%、0.091%,共振峰值在X、Y、Z方向降低了49.454%、29.036%、0.0078%。对结果分析可知优化后的并联机床在加工中避免了共振的发生,其加工精度得到了提高。

Optimal Design of 6-bar Parallel Machine Tool Based on HyperWorks

In view of the problem that the resonance phenomenon occurs in the process of parallel machine, which leads to the deformation of the mechanism and affects the machining precision. The 6-bar parallel machine is taken as the research object, and topology optimization method is used to optimize the bed of the parallel machine. Firstly, the optimized parts of the bed are determined as the column, the cross frame and fixed platform, which are optimized by topology optimization module in HyperWorks. The column and cross frame are optimized by adding some reinforcement. The size of the stiffeners of the column is further optimized. Modal analysis and harmonious response analysis are used to verify the whole machine. Comparing the model before and after optimization, it is found that the total mass of the optimized model is reduced by 17.8%, and the first three order resonance frequencies increases by 19.56%, 20.62% and 0.091%, respectively. The resonance peak decreases by 49.454%, 29.036% and 0.0078% in X, Y and Z directions. The analysis of the results show that the optimized parallel machine avoids the occurrence of resonance during processing, and the machining accuracy has been significantly improved.