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
1986 年 72 巻 16 号 p. 2225-2232
詳細
1986 年 72 巻 16 号 p. 2225-2232
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.
