PURPOSE: To reduce considerably edge drop and to obtain a product having no problems in surface quality by specifying the distances from the transverse edge of a rolling stock in the foremost stand and intermediate stand to the boundary point where the diameter of tapered rolls decreases.
CONSTITUTION: The trapezoidal roll 30 which has the boundary point of the decrease in the diameter of the roll in the position at ≥50mm in the central direction from the transverse end of the strip and having a flat barrel center part is used in the foremost stand in the stage of rolling the strip with ≥3 stands of tandem type rolling mills. The roll 32 having the flat part narrower in a range within 100mm than the width of the strip or wider than the width of the strip in the barrel center part is used in the intermediate stand. The roll 34 which is flat over the entire length of the barrel is used in the final stand.
NISHIDE TERUYUKI
SUGANUMA NAMIO
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