基于响应面法的球铰芯轴预成形多目标优化

Multi-Target Preform Optimization for Spherical Hinge Mandrel Based on Response Surface Methodology

以汽车推力杆球铰芯轴为例,运用正交设计试验与响应面二阶预测相结合的方法对锻造过程中预成形设计的多目标问题进行了优化。首先,以模具型腔充填率和提高锻件变形均匀性为目标,设计了正交试验,得到了影响综合成形性的主要因素,运用MATLAB软件对其中两个主要影响因子进行了精确预测,并通过优化图对优化结果进行了讨论。其次,在此优化结果的基础上以降低终锻成形力和模具最大等效应力为目标运用等径设计建立了响应面二阶模型进行了预成形再设计。通过预成形设计,得到了最佳的工艺参数,生产出了符合要求的产品。

The multi-target optimization was studied in application of response surface method and orthogonal design for a perform design of vehicle thrust rod spherical hinge mandrel. Firstly, taking deformation uniformity and mold filling completeness as the targets, orthogonal experiment was designed to acquire main factors which influence integrated deformation quality. The effects of two main factors were precisely predicted through MATLAB and the results were discussed by optimization graphics. Secondly, on basis of the optimization results, a second-order response surface model was established through equant design. The model was designed for preform reoptimization taking lower forging force and mold maximum effective stress as the targets. In application of the preform optimization method, the best polytechnic parameters were selected, and qualified products were produced.