FEM stress state analysis on springback reduction methods: variable blank holder force and stake bead

International Deep Drawing Research Group 37th Annual Conference

Silveira, Victor L.^1,2 ; Haase, Olavo C.^1 ; Stemler, Pedro M. A.^1 ; Viana, Ricardo A. M.^1 ; Duarte, Alisson S.^1,2

Sixpro VirtualandPractical Process, Rua Funchal, 308-lj13, Belo Horizonte, MG

31340-230, Brazil^1

Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Belo Horizonte, MG

31270-901, Brazil^2

关键词: Economic use;    Reduction method;    Side walls;    Spring-back;    Stress state;    Stress state analysis;    Variable blank-holder force;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/418/1/012109/pdf
DOI  :  10.1088/1757-899X/418/1/012109

来源: IOP

【 摘 要 】

The sheet metal forming process is characterized by elasto-plastic strains. Therefore, after removing the stamped part from the dies, it presents the springback phenomena. The present paper analyzes the adoption of a springback reduction methods in a hat bending forming process, i.e, the use of variable blank holder force (VBHF) and stake bead (SB). Based on a Finite Element Method (FEM) stress state analysis, springback magnitudes were correlated to the stress moment in the hat shape side wall. Both springback reduction methods, VBHF and SB, were well described and its practical and economic use in the industry discussed. The FEM stress state anlaysis showed a great correlation to the springback phenomena.