Baoshan Iron & Steel Co., Ltd.

Xiangchun Liu

Junjiang Liu

Chengbin Li

Rongjun Xu

Qingyu Meng

Genjie Wan

Disclosed are a continuous-curvature convex roll for continuously casting a bloom, and a manufacturing method therefore. An outer contour curve of a working portion of a body of the continuous-curvature convex roll contains a first straight-line segment (AB), a first transition curve segment (BC), an intermediate straight-line segment (CD), a second transition curve segment (DE) and a second straight-line segment (EF). The BC, the AB, and the CD have continuous first-order derivatives, continuous second-order derivatives, and continuous curvatures, thus forming a first transition curve with a continuous curvature. The BC and the DE are mirror-symmetrical. The continuous-curvature convex roll can uniformly deform a blank cast in a deformation area, thereby reducing cracks. The transition curve of the convex roll can be reduced, thereby being capable of further reducing a rolling pressure and the withdrawal resistance.

Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor

Disclosed is a light reduction method for continuous casting of a bloom plain-barrelled roll-roll combination. The method comprises: firstly obtaining three-dimensional temperature field profile, a two-phase region, solid-phase region thickness, and solid-phase fraction of a billet, determining positions of start and end rolls of the reduction, and setting a reduction amount of each tensioner roll according to the volume shrinkage of the billet; in an interval f=0.9-1.0 of the solid-phase fraction of the billet, performing a heavy reduction working mode; and in an interval f=0.25-0.80 of the solid-phase fraction of the billet, performing a light reduction working mode.

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Shanghai, China

Xiangchun Liu