Transactions of Materials and Heat Treatment

Title：Springback evaluation method based on curvature difference and its application

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ClassificationCode：TG386

year,vol(issue):pagenumber：2022,47(4):78-83

Abstract：

The springback of sheet metal is larger during the stamping process at room temperature, the existing evaluation methods cannot determine the specific location of the springback, and it is difficult to accurately guide the die modification. Therefore, in order to solve the above problems, a springback evaluation method based on curvature difference was proposed to characterize the springback of stamping parts, which accurately displayed the specific location of the springback for the part. First, the profile of stamping part after springback was obtained by optical three-dimensional scanner GOM ATOS Core, the punch profile was used as the profile of stamping part before springback, and the continuous surface was discretized into the point cloud by software MeshLab. Then, the discrete point cloud was fitted into a surface by a multi-level B-spline interpolation algorithm (MBA) to calculate the average curvature of each point, and the springback value was characterized by the curvature difference before and after springback. Finally, the method was used in the shaping stage of stamping parts for front windshield lower beam and front anti-collision beam made of aluminum alloy for an automobile, the die profile was corrected according to the curvature difference of stamping part before and after springback, and the springback amount of the part before and after die modification was compared by the displacement method. The results show that the maximum positive and negative displacements of the front windshield lower beam are reduced from +1.415 and -2.408 mm to +0.707 and -1.263 mm, respectively, and the maximum negative displacement of the front anti-collision beam is reduced from -3.574 mm to -0.801 mm, which significantly reduces the springback amount and meets the requirements of its size deviation. Thus, the springback evaluation method based on curvature difference can accurately find the location of the springback and effectively guide the springback compensation work.

Funds：

广东省重点领域研发计划项目（2020B010184002）

作者简介：张赛军（1978-），男，工学博士，副教授 E-mail：mesjzhang@scut.edu.cn 通信作者：刘进军（1974-），男，工学学士，工程师 E-mail：c20@luckyxiangxin.com

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