COLD ROLLING MILL, TANDEM ROLLING FACILITY, REVERSING ROLLING FACILITY, METHOD FOR MODIFYING ROLLING FACILITY, AND METHOD FOR OPERATING COLD ROLLING MILL

摘要

In order to reduce the diameter of the work rolls of a six-stage rolling mill and thus to enable rolling of a steel plate having unprecedented hardness and to enable rolling of a steel plate having conventional hardness but with a higher rolling reduction, and to prevent a decrease in production due to the use of a mill with a small work roll, such as a cluster-type multi-stage rolling mill, a cold rolling mill (51), which rolls a metal plate (1) having a minimum plate width of 600 mm or greater and a maximum plate width of 1,500-1,900 mm, is equipped with: a pair of work rolls (2), upper and lower, which roll the rolled material (1); a pair of intermediate rolls (3), upper and lower, which respectively support the work rolls (2); a pair of reinforcing rolls (4), upper and lower, which respectively support the intermediate rolls (3); axial direction shift devices (23) for the intermediate rolls (3); and bending devices (10, 11) for the work rolls (2) and the intermediate rolls (3). The diameter of the work rolls (2) is set between 300-400 mm, and the diameter of the intermediate rolls (3) is set between 560-690 mm.