Investigation of Springback Behavior and Process Control for Stamping of Ring-Shaped Workpiece

• Published in: Shanghai jiao tong da xue xue bao 2017-08, Vol.22 (4), p.385-394
• Main Author: 何俊艺 王贺 彭林法 易培云 来新民 林忠钦
• Format: Article
• Language: English
• Subjects: Architecture; Computer Science; Deformation; Deformation mechanisms; Elastic deformation; Electrical Engineering; Engineering; Finite element method; Life Sciences; Materials Science; Process control; Springback; Stamping; Surface analysis (chemical)
• ISSN: 1007-1172; 1995-8188
• DOI: 10.1007/s12204-017-1851-3

Due to the elastic deformation of metal stamping, springback is a serious problem to cause shape deviation and thus reduce precision. The springback behavior of ring-shaped workpiece is investigated in this paper and an auxiliary boss device is proposed to control the springback deformation. A finite element model is developed.The characteristic parameters including boss height, boss angle and boss gap are discussed systematically. It can be concluded that the gap has a positive linear correlation with springback percentage, and the boss angle has an optimal interval of 30°—60° to reduce springback. When the boss height increases, the springback decreases,but the effect weakens when the boss height is larger than 1.0 mm. Then, a response surface analysis is conducted with Design Expert 8.0.5 software and an optimal parameter process window(i.e., boss height from 2.1 to 3.0 mm,boss angle from 53° to 60° and the gap from 0 to 1.2 mm) is obtained. Finally, a set of molds are fabricated and the stamping experiments are conducted. The springback behavior is well controlled. The springback percentage can be decreased from 33% to 6% by using the auxiliary boss device of ring-shaped workpiece.