Research on the optimization of fillet rolling straightening process for large crankshafts
During the manufacturing process of large crankshafts with lengths ranging from 1.6 m to 8 m,secondary bending can occur due to thermal distortion and uneven cooling.This necessitates the use of fillet rolling straightening to further improve the runout of the main journal and connecting rod journal centers.To address the issue of excessive runout in large crankshafts and enhance processing efficiency,this paper focuses on the 16V-type large crankshaft,building on existing conclusions and establishing an optimized mathematical model.The NSGA-III algorithm and the PlatEMO platform were used to perform multi-objective optimization of the fillet rolling straightening process.By integrating the TOPSIS decision-making method,the closeness index of the Pareto solution set was calculated.Based on the index ranking results,the best scheme for each rolling straightening was selected,optimizing the process parameters(rolling pressure,rolling angle range).The optimization results showed high consistency with finite element simulation results,effectively reducing the post-straightening runout of each main journal of the 16V-type large crankshaft and decreasing the number of rolling straightening operations,ensuring that the crankshaft performance meets the required standards.
large crankshaftrolling straighteningmathematical modelpost-straightening runout optimiza-tionNSGA-III algorithm
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