Transactions of Materials and Heat Treatment

Title：Analysis and optimization on cold extrusion process of flange nuts for vehicles

Authors： Jiao Jian Peng Fang

Unit： Inner Mongolia Transportation Vocational and Technical College Inner Mongolia Vocational College of Chemical Engineering

KeyWords： flange nuts cold extrusion material folding orthogonal experiment forming load

ClassificationCode：TG316.11

year,vol(issue):pagenumber：2020,45(3):81-86

Abstract：

For the cold extrusion process of vehicles flange nuts, the six-position forming process was designed based on its structure features. Then, the hexagonal forming process prone to defect was selected, and its forming process was simulated by finite element analysis software DEFORM-3D. Furthermore, the material folding during forming process was solved successfully by replacing the original single-ejector structure with the double-ejector structure. At the same time, the radius of die, the cut-in angle of die core, the cut-in angle of punch and the friction coefficient were selected as the factors to reduce the forming load, and the orthogonal experiment was designed to optimize those parameters. Finally, the influence trends of each factor on forming load were obtained, and the optimal parameters were obtained with the radius of 0.5 mm, the cut-in angle of die core of 20°, the cut-in angle of punch of 10° and the friction coefficient of 0.12. After using the optimized mold structure and process parameters to test, the obtained parts meet the forming requirements, and the actual forming load is a good consistent with the result of finite element analysis to provide the theoretical basis for the actual production of flange nuts.

Funds：

校企联合项目（I2018-017）

焦健（1983-），女，硕士，讲师 E-mail：1002584622@qq.com

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