Analysis of tribological process during ironing of sheet metal made of AlMg3

Abstract

The paper gives detailed analysis of tribological processes which occur in ironing, their influence on tool and formed material by means of specially developed physical model of drawing process. The typical property of such cold forming procedures is multiple repetitions of operations, i.e. several thinnings in one operation, which leads to gradual increase of thickness of glued material layer on contact surfaces of the tool. At sufficiently large thickness of glued layers, plastic forming of created glued particles occurs, i.e. their tear-off, disruption of forming process stability and increase of surface roughness of work piece. The obtained results indicate the basic influence of tribo-conditions on ironing process, tool durability and quality of obtained parts. Key words: Ironing, tribo-modeling, tribological processes