Abstract:

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.

Key words: parallelmachine, resonance, machiningaccuracy, topologyoptimization, modalanalysis, harmonic response