| 摘要 |
PURPOSE:To roll a slab into a thick finished plate with less plate-width deviation in the longitudinal direction, by preliminarily rolling the slab before its broadside rolling to make its thickness distribution uniform in the longitudinal direction by adjusting a rolling down position, before broadside rolling its end part in the longitudinal direction into a thick part. CONSTITUTION:In the preliminary rolling X of a slab SL before its broadside rolling; the slab SL is preliminarily rolled by changing and adjusting a rolling- down position in accordance with the changes of the deformation resistance and inlet thickness of the thick plate due to mainly a presence of skid mark, to obtain a pre-rolling finished material SB before broadside rolling, having the uniform thickness distribution in its longitudinal direction. Successively, the material SB is turned by 90 deg., and is subjected to rolling reduction in its longitudinal direction by a vertical mill in a broadside rolling Y so that the plate thickness of its end part in the longitudinal direction is larger than that of the central part in the same direction, to obtain a finished material SW in the broadside rolling. The material SW is further turned by 90 deg., to obtain a finished plate CP, having prescribed dimensions and less plate-width deviation in the longitudinal direction, by a finishing rolling Z. |
