| 摘要 |
PURPOSE:To correct well the shape of end parts of a steel plate and to obtain a thick plate having rectangularly-edged cross section by performing flat edging after preforming the side-end parts of steel plate at the time of finish rolling the thick plate. CONSTITUTION:At the time of finish rolling a thick plate, a preforming of chamfering quantity (a) is applied for a plate material having single or double-bulged end-shape by using caliber rolls 8. Successively a rolling of edging quantity (e) is performed by using flat rolls. In this way, the edge rolling part is subjected to rolling reduction throughout its whole part, and defects such as recessed cease to generate. Accordingly a cutting work at the side-end part of plate is eliminated and the yield of plate material is improved. |
