CONTROL OF EARLY SOLIDIFICATION IN CONTINUOUS-CASTING BY HORIZONTAL OSCILLATION IN SYNCHRONIZATION WITH VERTICAL OSCILLATION OF THE MOLD

A new method of mold oscillation for continuous casting termed ''horiz ontal oscillation'' was developed to reduce the depth of oscillation m arks without increasing the possibility of breakout. In this method, t he wide faces of the mold oscillate horizontally in synchronization wi th conventional vertical oscillation. Oscillation marks on slabs of SU S304 cast with a pilot continuous easter were examined under various c onditions of mold oscillation. Horizontal oscillation successfully red uced the depth of oscillation marks and surface segregation at oscilla tion marks, and was extremely effective when the wide face of the mold was expanded against the solidified shell during positive strip time. Experiments with an actual machine reproduced these effects of horizo ntal oscillation. A numerical analysis of the deformation of the solid ified shell during one cycle of vertical oscillation was performed to study the effect of horizontal oscillation on the control of early sol idification near the meniscus. Friction force acting on the shell near meniscus was also discussed to explain the reduction in the surface s egregation.