| 摘要 |
PURPOSE:To increase the width of a material to be rolled considerably by forming wavy ruggedness in the width direction of said material the rolling the material with upper and lower rolls which are disposed in plural pieces in the longitudinal direction. CONSTITUTION:A plate material is rolled down by means of a rolling mill using rolls 1, 2 provided with ruggedness like a sine curve in the axial direction, whereby a plate material S having waves in the width direction is formed. Plural pieces of upper and lower paired flat rolls R<21>, R<22>, R<23> are disposed in the longitudinal direction, and the material S having the waves is passed between the roll groups R<21>, R<22>, R<23> to elongate the waves in the width direction. A considerable amt. of an increase in the width is thus obtained. |
