| 摘要 |
PURPOSE:To enable a larger with rolling reduction by preventing the generation of a camber, the torsion and camber of a slab, by forming within a limited range the side wall inclination and bottom part width of a pair of U-shaped tool pressing a hot slab. CONSTITUTION:The side wall inclination theta in the rolling reduction direction of a pair of U-shaped tools 1, 1 performing the width rolling reduction of a hot slab 2 is formed in the range of 30-60 deg. and the bottom part width b of the tool is formed in the range of 95-110% of the initial thickness t0 of the hot slab 2 press it in the prescribed width. In this case, a torsion and chamber are generated in case of the side wall inclination theta being larger than 60 deg. or B/t0 being larger then 110%. In case of the theta being smaller than 60 deg. and B/t0 being smaller than 95%, or the theta being smaller than 30 deg. and B/t0 smaller than 110%, the friction force of the slab 2 and tool 1 becomes larger, the slab 2 moves in a cross direction and a camber is generated. |
