| 摘要 |
PURPOSE:To decide accurately the position of a stepped part and to obtain a product with precise length by setting a movable detector to a prescribed position and stopping the rotations of rolls by detecting the rear end of a part having the thicker sheet-thickness of a material to be rolled. CONSTITUTION:A material to be rolled is rolled throughout its whole length so that the material has the thickness equal to that of its thicker part; in the two passes of normal and reverse runnings of successive rollings, the normal rolling is started by setting a roll opening to the thickness of a thin sheet-thickness part. In this case, a detector 5 to be located at the side of material rear end B, is set to the prescribed position from the center line Y-Y of rolls. The rotations of rolling rolls 1, 2 are once stopped at the time when the rear end B is detected by the detector 5 after rolling the material in the normal direction. Then the sheet thickness of the thin-thickness part is rolled into the prescribed thickness and length by continuing the rolling after reversing its rolling direction without changing the setting of roll opening. |
