关键词: 齿环, 热精锻, 灰色关联分析, 参数优化

Abstract: To solve the problem of copper synchronizer ring occurred during the hot precision process such as forging defects,low material utilization and large forming load,a multi-objective optimization method based on Grey Relational Analysis(GRA)was introduced to optimize the process parameters.The central composite experiment method was used for the experimental design in which the design variables were the inner diameter of billet,the height of billet,the forming temperature and the pressing speed.Taking the forging defects and filling,the volume of inner flash,the radius of outer flash and the maximum forming load as the optimization goals,GRA and the entropy method were employed to transform the multi-objective problem into a single-objective optimization problem based on Grey Relational Degrees(GRD)and the corresponding Response Surface Model(RSM)was constructed.The combination of optimal process parameters was obtained by calculating the model.The numerical simulation and actual production were carried out using the combination of optimal process parameters to verify its rationality.The results showed that the combination of optimal process parameters could ensure the product quality after hot precision forging without any forging defects,and could also enhance the material utilization rate and reduce the forming load.

Key words: synchronizer ring, hot precision forging, grey relational analysis, parameter optimization