Mould lubrication and friction behaviour with hydraulic oscillators in slab continuous casting

Abstract

It is very important to obtain reliable lubrication from casting powder both at the meniscus and in the gap between strand and mould as it affects slab surface quality and caster productivity. With knowledge of mould friction, a quantitative insight into the behaviour of powder during caster operation is possible. In the present research, the friction was studied based on a slab continuous caster equipped with hydraulic oscillators. The effects of mould oscillation and the abrupt change of casting speed on mould friction force were evaluated, and the characteristics of lubrication behaviour in a casting sequence were investigated. In particular, a comparison between the mould friction force between sinusoidal oscillation mode and non-sinusoidal oscillation mode was made. Finally, the characteristics of friction before a breakout are discussed. The experimental and analytical results may contribute to the development of mould friction online measurement and more clearly learn the lubrication behaviour in different conditions.

Optimization of Mold Inverse Oscillation Control Parameters in Continuous Casting Process

“…1. Due to mold oscillation, the solidified shell detaches from the mold inner wall and the solid powder that is poured from the top onto the meniscus is continuously pumped into the channel between the mold and the shell to form solid and liquid films [1,2]. However, mold oscillation simultaneously results in the presence of periodic oscillation marks which may lead to the formation of transverse cracks [3].…”