Transactions of Materials and Heat Treatment

Title：Optimization on loading path in hydroforming process for X-type tube

Authors： Feng Yingying Liu Zhaosong Zhang Hongge Luo Zong′an

Unit： Northeastern University FAW CAR Co. Ltd.

KeyWords： loading path X-type tube hydroforming minimum wall thickness branch pipe height ultimate fillet radius

ClassificationCode：TG394

year,vol(issue):pagenumber：2022,47(5):121-127

Abstract：

The loading path is very important to the hydroforming quality of X-type tube. Only when the various parameters of the loading path are properly matched, the qualified formed parts can be obtained. Therefore, the formability of X-type tube under different loading paths was simulated by software DYNAFORM. Then, based on the test design of Box-Behnken Design and response surface method, taking the internal pressure, axial feeding amount, back displacement and friction coefficient as the main test factors and the minimum wall thickness, branch pipe height and ultimate fillet radius as the objectives, the response surface model was established, and the loading path of X-type tube hydroforming process was designed and optimized by the analysis of variance and regression equation, which improved the wall thickness distribution, reduced the ultimate fillet radius and increased the branch pipe height. Furthermore, the optimal loading path was selected by the numerical optimization function of software, and under this loading path, the simulation results of X-type tube hydroforming were compared with the test results. The result shows that the error is less than 5%, and the wall thickness distribution is consistent, which indicates that the loading path optimization method has high accuracy and good feasibility.

Funds：

国家自然科学基金资助项目(52105322)

作者简介：冯莹莹（1982-），女，博士，副研究员，E-mail：fengyy@ral.neu.edu.cn

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