Effect of Side-Dam Plate on Burrs at Edges of Aluminum Alloy Strip Fabricated by a High Speed Twin Roll Caster

Abstract

A high speed twin roll caster is able to cast an aluminum alloy strip directly from a molten metal at high casting speed. However burrs at edges of the cast strip occurred depending on used aluminum alloy. It is the special problem, which a conventional twin roll caster didn't have. Burrs damages side-dam plate used in a high speed twin roll caster. In addition, it may affect down-stream process. We predicted that burrs are rerating to flowability at semi-solidification. In this study, we adjusted side-dam plate lower end position at the casting, and investigated relationship between occurrence position of the burrs and amount of the Si. Additionally, it was added hole drilling for eliminating the burrs. We used AA6061, AC4CH, ADC12, Al-25%Si. As a result, occurrence positions of the burrs were different depending on amount of the Si. The Side-dam plate with the hole was possible to eliminate the burrs.