| 摘要 |
<p>PURPOSE:To produce a plate material having good width accuracy by corrugating and rolling a blank material with upper and lower rolls having ruggedness in the axial direction thereof at the draft varied according to the width and longitudinal direction of the blank material then rolling the material with flat rolls. CONSTITUTION:A slab S is rolled by a rolling mill which uses upper and lower rolls 1, 2 having ruggedness of a sinusoidally curved shape in the axial direction thereof and which opposes the troughs and crests of the roll 2 to the crests and troughs of the roll 1. After the slab is rolled transversely into a corrugated shape by said mill, the slab is passed through flat roll 6, 7 groups disposed into a plurality in a longitudinal direction so that the corrugations formed on the slab S are spread in the transverse direction to accomplish spread rolling. The flat slab S is thus obtd. The rolling reduction of the corrugation rolling is set small for the part of one continuously cast slab S where the slab width is large and the rolling reduction is set large for the part where the slab width is small, thereby absorbing the fluctuation in the width of the slab S and providing the plate material having a prescribed width.</p> |
