高速スラブ連続鋳造機におけるロール配列の最適化による内部割れ防止

概要

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Concerning a high speed continuous slab caster, strains in a slab were analyzed and a state of loads act on rollers was discussed. From this analysis, the followings were elucidated : 1) The maximum strain in a slab caused by bulging is the component in the casting direction on a inner surface of a shell in a broad side of a slab just under a roller. 2) The allowable roller pitch to prevent internal cracks of a slab caused by bulging becomes much smaller as a temperature of a slab becomes higher. But the influence of a casting speed on the allowable roller pitch is small. 3) Straightening strains in a slab advance not along a designed radius of a machine but along a curvature defined geometrically by a roller arrangement, and the variation of strains of a slab is not linear in a roller pitch and in some cases strain rate becomes very large. 4) For high speed casting, multi-straightening is necessary to prevent internal cracks of a slab caused by straightening strains. Further, using the results of this investigation, a method of the decision of proper arrangements and constructions of rollers to prevent internal cracks of a slab was systematized.
社団法人日本鉄鋼協会の論文
1986-12-01