Transactions of Materials and Heat Treatment

Title：Hydro-drawing technology for thin-walled variable curvature part with large diameter to thickness ratio

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ClassificationCode：TN911.73；TP391.9

year,vol(issue):pagenumber：2022,47(4):126-133

Abstract：

In order to improve the forming quality of thin-walled variable curvature part with large diameter to thickness ratio，the hydro-drawing technology was analyzed, and the deformation mechanism of material and the influencing laws of process parameters were investigated by the method of combining CAE technology and experiment. Then, in order to form a better part, the influences of parameters such as sheet size，chamber pressure and fillet radius on the forming were analyzed, and the process parameters were optimized by experiment. At the same time, the split die structure with angle α was designed to realize the beneficial effects of effectively reducing the blank holder force, wrinkling risk and liquid volume. The results show that the variable curvature part is successfully formed with the sheet size of Φ1250 mm，the chamber pressure of 5-7 MPa and the die fillet radius of 30 mm，and pass the dimensional inspection. The profile dimensional accuracy of product is improved from 0.8 mm to 0.4 mm and reduces the thinning ratio of part，which provides technical support for the improvement of the precision manufacturing level for thin-walled part.

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作者简介：周永新（1969-），男，工程硕士，副教授 E-mail：764141530@qq.com

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