Influence of Temperature in Front Face Flow Drilling and Thread Forming of Lightweight Cast Alloys

Abstract

In face flow drilling of lightweight cast materials, the heat transfer makes a significant contribution to forming ability. Especially during processing of the magnesium alloy AZ91 and the aluminum alloy AlSi10Mg, microstructural mechanisms lead to in high rates of deformation, resulting in undesirable hardening of the marginal zones. During the subsequent thread forming process, the resulting microstructure leads to an inadequate forming of the internal thread. In order to improve the geometrical and mechanical thread quality, the influences of the initial tool temperatures and the heat input induced during the forming processes are analyzed within this paper.