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针对深型腔类锻件模锻成形过程难以起形的问题,在综合常规飞边槽与楔形飞边槽优点的基础上,提出了新型预锻模具结构--双拔模加变斜面结构。以减小深型腔部位未充满距离和降低成形载荷为目标,通过优化分析得到最优结构参数,为双拔模加变斜面结构的应用提供设计依据。应用正交试验设计对结构参数进行抽样,采用有限元分析软件Deform对所得样本进行数值模拟仿真。对模拟结果依据各指标重要性不同确定各指标相对重要性的权数,然后求加权和作为试验总分数,参考总分高低确定最优实验方案。生产实践表明,采用带双拔模面加变斜面结构的预锻模,能够保证得到合格的锻件,验证了优化结果的可靠性。
Aiming at the problem that the die forging process of the deep cavity forgings is difficult to form, a new type of preform die changing structure is presented based on the merits of the conventional fringe troughs and wedge gobs. In order to reduce the unfilled distance and reduce the forming load in the deep cavity, the optimum structural parameters are obtained through optimization and analysis, providing the design basis for the application of double draft and variable slope structures. Orthogonal experimental design was used to sample the structural parameters. The finite element analysis software Deform was used to carry out numerical simulation of the obtained samples. According to the simulation results, the weight of each index is determined according to the importance of each index, then the weighted sum is used as the total score of the experiment, and the optimal experiment scheme is determined with reference to the total score. Production practice shows that the use of pre-forging dies with double-pulling surface and changing bevel structure can ensure qualified forgings and verify the reliability of the optimization results.