Patent ID: 11872613
Assignee: NIPPON STEEL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 12:
13. The method for setting a rolling mill according to claim 10, wherein:
the rolling mill is a six-high rolling mill comprising intermediate rolls between the work rolls and the backup rolls, respectively,
a plurality of rolls, including one intermediate roll of the intermediate rolls, one roll of the pair of work rolls and one roll of the pair of backup rolls, provided on an upper side in the vertical direction with respect to the workpiece are adopted as an upper roll assembly, and
a plurality of rolls, including an other intermediate roll of the intermediate rolls, an other roll of the pair of work rolls and an other roll of the pair of backup rolls, provided on a lower side in the vertical direction with respect to the workpiece are adopted as a lower roll assembly;
the method including performing:
a first adjustment in which a roll gap between the work rolls is set in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, positions of the roll chocks of the intermediate roll and the roll chocks of the backup roll are adjusted,
after the first adjustment ends, a second adjustment in which the roll gap between the work rolls is maintained in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, positions of the roll chocks of the intermediate roll and the roll chocks of the work roll are adjusted, and
after the second adjustment ends, a third adjustment in which the work rolls are set in a kiss roll state, either one of the upper roll assembly and the lower roll assembly is adopted as a reference roll assembly including the reference roll, and adjust the roll assembly opposite to the reference roll is adjusted by controlling the roll chocks simultaneously and in a same direction while maintaining relative positions between the roll chocks;
wherein:
the first adjustment and the second adjustment are performed in a state in which a bending force is applied to the roll chocks of the intermediate rolls and the roll chocks of the work rolls;
in the first adjustment, with respect to each of the upper roll assembly and the lower roll assembly, the roll chocks of the intermediate roll on the reference roll assembly and either one of the roll chocks of the intermediate roll and the roll chocks of the backup roll of a roll assembly is one of the upper roll assembly and the lower roll assembly, differ from the reference roll assembly, are moved in the rolling direction of the workpiece to adjust positions of the roll chocks so that the rolling direction force differences measured fall within an allowable range; and
in the second adjustment, with respect to each of the upper roll assembly and the lower roll assembly:
the roll chocks of the work roll on the reference roll assembly and either one of the roll chocks of the work roll and the roll chocks of the intermediate roll of the roll assembly on the opposite side to the reference roll are moved in the rolling direction of the workpiece to adjust positions of the roll chocks so that the rolling direction force differences measured fall within an allowable range, and
in a case of moving the roll chocks of the intermediate roll of the roll assembly on the opposite side to the reference roll, the roll chocks of the intermediate roll and the roll chocks of the backup roll that is adjacent to the intermediate roll are controlled simultaneously and in a same direction while maintaining relative positions between the roll chocks of the intermediate roll and the roll chocks of the backup roll.