A Study of Ability of a Rectangular Shell Deep Drawing by Finite Element Program

Abstract

Abstract This study was the use of the finite element method in the deep drawing process of a rectangular shell cup. The aim was to analyse the equivalent strain in the workpiece and to find out what happened to the disc blank sheet before the forming by stamping. The rectangular shell cup was 24x30x20 mm. and made of 2mm.thick SUS 403 and SUS 304 stainless steel. There were 3 types of blank sheets: 1) square sheet 2) 45 degree angled edge cutting sheet 3) circular sheet. It was found out that the drawing up with the use of 3 types of blank sheet made of SUS 304 stainless steel had no risk in the workpiece. For the stamping of the rectangular shell that used a square sheet made of SUS 403 stainless steel, it was found out that there was no risk in the work piece, but with the use of 45 degree angled edge cutting sheet or round sheet, the work piece had a risk to be damaged. Keywords: rectangular shell, Finite element 1. INTRODUCTION Deep drawing is very important to component manufacturing of parts of a product in industries. The problem of the rectangular shell cup deep drawing process was the equal amount of flow in each side, resulting in making mould in an actual production process. Therefore, finite element process plays a role in analyzing the ability of a rectangular shell deep drawing process and it well known that using steel sheet in deep drawing process requires an awareness of the factors that have an effect with finished workpieces to prevent the damage that may happen with workpieces during the deep drawing process There are the factors or variable that have an influence on ability in drawing. During the deep drawing, the punch will be stamped on the blank sheet through the die opening. This process will make the bending and unbending in the die. The metal between the punch will have tensile stress along the line of the punch and the hoop compression stress. The metal on the shell wall will receive axial tension. At the bottom of the shell the metal will have tensile stress on both axial lines. This stress has an effect to the force in drawing and damage that will be