EFFECT OF PUNCH PROFILE RADIUS ON SPRING-BACK IN V-BENDING OF HIGH STRENGHT STEEL AND ITS FEA SIMUALTION

Abstract

Spring-back is a common phenomenon in sheet metal forming, caused by the elastic redistribution of the internal stresses during unloading. It has been recognized that spring-back is essential for the design of tools used in sheet metal forming operations. A finite element (FE) program has been used to analyze the sheet metals axisymmetric V-bending process. [1].Numerical models by FEM were developed by using ABAQUS and DEFORM software. The principal objective of this analysis consists of predicting the spring-back for flanging and compares these results with some experimental data. [2] .Knowing that spring-back amount of bending material in bending dies is as important as the die itself, because the material leaving the die should be within the allowed tolerance limits. Therefore, in this study the subject of bending dies and spring-back in bending process has been researched. In order to find spring-back in bending, a „„V‟‟ shaped die is designed and it has been aimed to find out how much can steel sheet metal materials resile in various angles and to bring forward spring-back graphics to add literature. There is little satisfying information in the literature regarding this issue. In order to reach a conclusion, 6 different dies have been prepared, more than 54 samples, each of which have been bent and the obtained angles have been measured with profile meter. The acquired results have been statistically evaluated in a computer media and converted to graphics.