Finite element analysis of spring-back of V-bending sheet metal forming processes

This paper presents a study of spring-back in the V-bending metal forming process with one clamped end and one free end. Spring-back occurs at the die-lip and V-region of the die model. Different die punch parameters such as punch radius, punch angle and die-lip radius are varied to study their effect on spring-back. Also, the effect of the punch displacement on spring-back is investigated. The H-convergence test is done to justify the number of elements used. Softwares used are Patran, Abaqus/Standard and Abaqus/CAE. Patran is used to model the nodes of the sheet metal and rigid surfaces of the die, pad and punch. Abaqus/Standard is used to simulate the punching process. The results are analyzed using Abaqus/CAE. The analysis shows that spring-back angle of the valley region decreases with increment of punch radius and punch angle. Spring-back is dependent on punch radius, punch angle and die-lip radius.