Transactions of Materials and Heat Treatment

Title：Secondary hydroforming process of a hardened stainless steel part

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ClassificationCode：TG394

year,vol(issue):pagenumber：2025,50(8):90-96

Abstract：

The influence of material hardening on the secondary hydroforming of stainless steel parts was determined by analyzing the material properties of hardened stainless steel parts, and the secondary hydroforming process scheme was simulated to investigate its impact on the parts. Then, the load transfer between processes was improved by adding the pre-forming design and load-reducing columns of hardened stainless steel parts, and the response surface model was established by taking the maximum clamping force, the maximum thinning rate and the maximum springback required for the secondary hydroforming of hardened stainless steel parts as the optimization objectives, and taking the liquid chamber pressure, the interval time and the diameter of load-reducing columns as the design variables. Furthermore, by the response surface method, the process parameters of the secondary hydroforming of hardened stainless steel parts were optimized as the liquid chamber pressure of 13.58 MPa, the interval time of 4 h, and the load-reducing columns diameter of Φ1313 mm. The verification results show that the tensile strength of parts is increased by 4% due to material hardening within 24 h, the die-closing tonnage is reduced by 51% due to the use of load-reducing columns, and the maximum springback amount of parts is increased by 28% due to the secondary hydroforming.

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作者简介：熊爱奎（1984-），男，硕士，高级工程师 E-mail：xiongaikui@gt.cn 通信作者：姬晓东（1992-），男，学士，工程师 E-mail：xiong791912@126.com

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