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摘要：
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六角抽孔螺栓头部具有较深的内孔，使得其工艺设计成为难点，针对该问题提出一种六角抽孔螺栓多工位冷镦成形工艺。利用有限元模拟软件Deform-3D，对六角抽孔螺栓的多工位冷镦成形过程进行了数值模拟，分析了零件成形过程中的载荷-行程曲线、等效应力、等效应变及损伤值分布，最后进行了工艺试验。研究结果表明：提出的多工位冷镦成形工艺是可行的，模拟得到的冷镦件充填饱满，在成形工位2、工位3和工位4时载荷值较大，分别为429，826和380 kN；损伤值最大为0.38，小于40Cr钢的临界损伤值0.42，不容易产生裂纹。工艺试验得到的产品和模拟结果具有较好的一致性，冷镦件尺寸一致性较好，说明工艺可靠，对该类零件的多工位冷镦成形工艺具有一定的指导意义。
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Six-angle hole bolt has a deep inner hole to make its technological design difficulty. For this problem, a multi-station cold upsetting process for six-angle hole bolt was presented, and the multi-station cold upsetting process for six-angle hole bolt was simulated by finite element simulation software Deform-3D. Then, the load-stroke curve as well as the distributions of equivalent stress, equivalent strain and damage value in the forming process were analyzed, and the experiment was conducted to validate the simulation results finally. The research results show that the multi-position cold upsetting process is feasible, and the simulated cold upsetting parts are filled fully. However, the loading values are larger at station 2, station 3 and station 4, which are 429，826 and 380 kN respectively, the maximum damage value 0.38 is less than the critical damage value 0.42 of 40Cr, and the crack is not easy to generate. Furthermore, the products obtained in the experiment and the simulation results have a good consistency, and the size consistency of cold upsetting part is better. The results shows that the multi-station cold upsetting process for six-angle hole bolt is reliable, which has a certain directive significance to the multi-station cold upsetting technology of this kind of parts.
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基金项目：
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郑州市科技重大专项资金（152PZDZX007）
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作者简介：
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刘光辉(1989-), 男, 硕士，工程师，E-mail：liu0406gh@163.com；通讯作者：刘华（1962-），男，博士，博士生导师，研究员，E-mail：13903832971@163.com
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