JPS5630008A - Rolling method for hot strip - Google Patents

Abstract

PURPOSE: To restrict the increase of the amount of the crop even if the breadthways rolling reduction is greatly increased, and to contrive the improvement of the yield, by forming the forefront and the tail ends of the slab into the tapered shape in respect of the breadthways rolling reduction, at the titled rolling method by the vertical and the horizontal rolls.

CONSTITUTION: At the titled rolling method in which the slab is subjected to the breadthways edging pass by the vertical roll and to the flat rolling pass in the direction of the thickness by the horizontal roll, the plane shapes of the slab's forefront and tail ends are both formed into the tapered shape in respect of the breadthways rolling reduction. That is, the taper forming depths in the direction of the breadth at the forefront and tail ends, respectively m₁T and m₁B, are made smaller than the taper forming lengths in the longitudinal direction at the forefront and tail ends, respectively l₁T and l₁B; then the taper forming lengths l₁T and l₁B respectively at the forefront and tail ends are restricted together so as to satisfy the formula I in which ΔW is for the breadthways rolling reduction, and basides, the taper forming depths in the direction of the breadth respectively at the forefront and tail ends, m₁T and m₁B, are restricted to satisfy the formula II. Meanwhile, above stated taper forming depths in the direction of the breadth may be made larger than the taper forming length in the longitudinal direction in forming the taper shape in respect of the breadthways rolling reduction.

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