Transactions of Materials and Heat Treatment

Title：Cold heading technology on automotive large flange nut based on finite element analysis

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ClassificationCode：TG316

year,vol(issue):pagenumber：2023,48(10):31-37

Abstract：

For automotive large flange nuts, two cold heading process schemes were proposed by structural analysis. Firstly, the deformation characteristics of 40CrNiMoA steel at room temperature were studied to establish an accurate material model. Secondly, finite element modeling and forming simulation on the first four stations of the two schemes were conducted by software Deform-3D, respectively, and the filling of mold, the deformation of material, the distribution of equivalent stress and the forming load of each station were compared to determine a more feasible cold heading scheme. Finally, according to the feasible scheme, the mold structure of each station was designed and manufactured, and a mold testing was carried out by a 6-station cold heading machine. The results show that the cold heading process is stable, the production speed is fast, and the manufactured large flange nuts have complete shape, good quality and no serious defects such as folding and cracking, and the performance meets the requirements of manufacturer.

Funds：

2021年度河南省科技厅科技攻关项目（212102210249）

田亚丁（1976-），男，本科，副教授 E-mail：xixihaha1217@aliyun.com

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