锻压技术

大型深孔圆锥形构件省力挤压成形工艺研究

英文标题：Research on labor-saving extrusion forming process of large deep hole conical workpiece

作者：谢志平万博维张治民黄有旺

分类号：TG379

出版年,卷(期):页码：2015,40(2):87-92

摘要：

针对大型深孔圆锥形构件一次整体反挤压成形载荷与能耗大的缺点，结合变薄拉深工艺，提出了一种省力挤压成形工艺。通过数值模拟对比分析，发现在构件成形过程的前、中期，省力挤压成形工艺的载荷约为一次整体反挤压成形工艺的1/2 左右，显著减小了能耗。研究发现，省力挤压工艺中预成形工步的锥筒坯料底厚对终成形工步的载荷有很大的影响：载荷值随着锥筒坯料底厚减小而减小；而底厚太小会产生折叠，甚至产生底部填充不满的现象。通过优化终成形工步的凸模，使得省力挤压工艺终成形工步的最大载荷降为一次整体反挤压的1/2左右。最后，通过物理实验，用较小的成形力成形出了合格的构件。

Based on the shortcomings of large forming load and energy consumption of the one-step integral backward extrusion forming process of large deep hole conical workpieces, a labor-saving extrusion forming process was put forward combined with thinning drawing process. Through the comparative analysis of simulation, it is found that the load of the labor-saving extrusion forming process is half that of the one-step integral backward extrusion forming process and the energy consumption is significantly reduced at the beginning and intermediate stages. It is also found that the thickness in the bottom of preformed workpieces has a great influence on the final forming load: the load reduces with the decrease of the thickness in the bottom of preformed workpieces. However, when the thickness in the bottom is too thin, the wrinkle in the bottom will occur and even unable to be filled completely. Through optimizing the final forming punch, the maximum load of the labor-saving extrusion final forming process reduces about a half than that of the one-step integral backward extrusion forming process. Finally the qualified workpieces were formed with a smaller forming force through physical experiments.

基金项目：

山西省自然科学基金资助项目(2013011022-5，2012011022-2)

谢志平(1989-)，男，硕士研究生张治民(1956-)，男，博士，教授，博士生导师

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