Transactions of Materials and Heat Treatment

Title：Multi-step hydro-mechanical forming process for automobile exhaust pipe with large changing rate of cross section

Authors：

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ClassificationCode：U27

year,vol(issue):pagenumber：2021,46(10):141-149

Abstract：

In order to solve the overall manufacturing problem of exhaust pipe with large changing rate of cross section for a passenger car, the finite element model of the hydro-mechanical forming process including die closing, feeding, forming and shaping for 439 ferritic stainless steel tube was established based on eta/DYNAFORM. Combined with experiments, the influence laws of key process parameters on forming quality were studied, and the loading path of hydro-mechanical forming were designed and optimized. The results show that the loading path has a significant effect on the wall thickness distribution and thinning rate of exhaust pipe. In the first pass, the loading path including forming pressure, shaping pressure and axial feeding displacement is obtained by the response surface method, and the maximum thinning rate of the obtained parts is 5.2%. In the second pass, the maximum thinning rate is 5.0% after optimization. In the third pass, the maximum thinning rate is 5.2% after optimization. The cumulative maximum thinning rates before and after optimization are 31.5% and 23.7%, the reduction region is 24.7%. Then the experimental verification proves that the optimized hydro-mechanical forming process significantly reduces the risk of crack for part, and the excellent overall automobile exhaust pipe parts with large changing rate of cross section are obtained.

Funds：

国家自然科学基金资助项目（51875548）；中国科学院青年创新促进会专项（2019195）；沈阳市重大科技成果转化专项（20-203-5-30）

作者简介：岳峰丽（1970-）,女，硕士，副教授 E-mail：flyue@163.com 通信作者：徐勇（1983-），男，博士，研究员 E-mail：yxu@imr.ac.cn

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