The influence of the punch shape on the residual stresses distribution and springback in the case of conical drawn parts

Abstract

The residual stresses that occur in drawn parts after tools removing are the main cause that generates the springback of such parts. Hence, to investigate the springback phenomenon it is needed to know at first the state of residual stresses developed in part by its cold forming. Because of the complex forming tools and parts geometry, the experimental investigation of residual stress distribution in the case of drawn parts is a difficult problem. A possible solution of the problem can be the simulation of the forming process, springback and residual stress distribution. The present paper investigates the influence of the punch shape on springback intensity and residual stresses distribution by simulating the drawing process in the case of conical parts made from steel sheets by using the following two punch shapes: cylindrical and conical.