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开发一种带有变内径凹槽的辊轮式模具,实现变壁厚回转体构件的塑性成形,解决传统工艺采用机加方式带来材料利用率低的问题。通过对变形过程中前滑值的预测,设计出辊轮的凹槽弧长;采用中心复合的方法设计试验方案,借助数值模拟,建立以变形均匀性因子为目标,以辊轮结构参数为变量的响应曲面优化模型,获取辊轮结构参数的最优组合。结果表明,成形构件的尺寸不仅达到要求,且各项力学性能指标都有很大提高,验证了前滑模型和辊轮结构参数优化模型的合理性。
A roller mold with a variable inner diameter groove is developed to realize the plastic forming of a variable wall thickness rotating body and solve the problem of low material utilization caused by the traditional process. Through predicting the forward slip value in the deformation process, the arc length of the groove of the roller was designed. The test program was designed by center compound method. With the help of numerical simulation, aiming at the deformation uniformity factor and the roller structure parameter as the variable Response surface optimization model to obtain the optimal combination of roller structural parameters. The results show that the size of the formed parts not only meets the requirements, but also greatly improves the mechanical properties. The rationality of the optimization model of the front sliding model and the roller structural parameters is verified.