Springback behavior and surface quality of austenitic stainless steel plate during bending process

Abstract

This project presents the design development and fabrication of bending dies and spring-back in behaviour and surface quality bending process on a Austenitic Stainless Steel 316 plate by means of stamping machine. A bending die had been designed in 2D and 3D using AutoCad and Solidwork. In order to find spring-back in bending, a ‘‘V’’ shaped die is designed and fabricated. The aims of this study is to investigate how much can 316L stainless steel sheet resile at various angle and to bring forward spring-back graphic to field of knowledge. Spring-back is a common phenomenon in sheet metal forming, caused by the elastic relocation 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. Therefore, in this study the subject of bending dies and spring-back in bending process has been investigated rolling direction is one of the factors to control the spring-back. In this study two directions (along & across bending) of the rolling direction were analyzed using optical microscope to check the surface quality. A bending die was fabricated using standard procedure and machining. The special design 316L plates were used as the strip and stamped using Press Machine. Most of the components were fabricated using the various facilities at KKTM Balik Pulau, Pulau Pinang. Hardened Steel punches with various angles (60°, 90° and 110°) were used. The upper surface bending was collected and analysed using microscope. The minimum angle and surface quality of the plates were then recorded.