| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase the rolling reduction ratio to be possible to roll under restraining the load at the biting time, and to avoid the increase of rolling torque and rolling load generated at the biting time by applying the load on the reverse direction to the compressing direction of a rolling material into a rolling mill to give the rolling mill the extension, rolling the front tip part of the rolling material under this state, thereafter, releasing the load and rolling the stationary part. SOLUTION: Before biting the front tip part of the rolling material into work rolls 3, backup roll chocks 10 are pushed with the same load as the setting rolling load by extendedly driving a movable part 8 of a cylinder device 7 and the load in the reverse direction to the compressing direction of the rolling material is acted to the rolling mill to give the rolling mill the prescribed extension. Under this state, the rolling material is rolled and when adjudging means is judged to match the detected load in a load cell 6 with the rolling load, a changing device 14 changes over a supplying route of oil to each part in the cylinder device 7 so as to be driven to shrink a movable part 8 to release the pushing force of the roll chocks 10 in the movable part 8.</p> |
