Transactions of Materials and Heat Treatment

Title：Influence of diameter size for prefabricated hole on inner-hole flanging

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ClassificationCode：TG386

year,vol(issue):pagenumber：2020,45(7):66-71

Abstract：

The inner-hole flanging process of a typical automobile structural muffler connection flange was simulated numerically by finite element analysis software Dynaform, and the influence laws of different prefabricated hole diameters on inner-hole flanging were analyzed. Then, the optimum diameter size of prefabricated hole for this part was determined, and it was trial produced in production practice. The results show that when the prefabricated hole diameter increases, the thinning rate and the wall thickness at the orifice and rounded corner increase, but the flanging height of parts decreases. However, the flanging height of parts calculated by simulation is not consistent with the flanging height calculated by the traditional theoretical formula to prove the existence of certain defects in the traditional theoretical formula further. Furthermore, the simulation results were verified in actual production at the existing equipment. When the prefabricated hole diameter of muffler connection flange is Φ20 mm, the punching parts meet the requirements, and the size parameters meet the design requirements.

Funds：

广西中青年能力提升项目（2018KY1162）；广西科技厅重点研发项目(AB16380288)

赵博宁（1981-），女，硕士，副教授 E-mail：48100687@qq.com

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