Patent ID: 6701999
Filing Date: 2004-03-09
Classification: B22D

Abstract:
A process for producing a slab from steel, in which a strand leaves a permanent mold with liquid melt surrounded by a strand shell and, in a downstream strand guiding assembly, a gap between guide rollers mounted in strands is set infinitely variably by adjusting elements which connect lower and upper frames, the process comprising the steps of:a) continously changing the gap (s) by oscillating the size of the gap about a predeterminable center line of the gap while the strand is drawn out of the mold so that dynamic influences on the guide rollers are negligible and no plastic deformation of the strand shell occurs; b) recording the current gap(s); c) simultaneously determining an actuating force (F) of the adjusting elements and a magnitude (A) of the force from which strand shell strength is determinable; and d) with increasing magnitude of the actuating force (F), at least one of setting the gap (s) to a predeterminable value and pressure-controlling the gap by means of at least one adjusting element, whereby when the gap is larger the force on the strand is smaller and when the gap is smaller the force on the strand is larger.