| 摘要 |
PURPOSE:To manufacture a steel sheet, excellent in sheet-thickness accuracy, in high yield, by controlling the sheet thickness of a material to be rolled throughout the whole range of the material ranging from its front end to its tail end under the absolute-value AGC system, in rolling a steel sheet. etc. CONSTITUTION:In rolling a steel sheet 1, material to be rolled, etc. by work rolls 2, the plane shapes at the front and tail ends of the sheet 1 are detected before rolling by a shape-detector 8 and ; the detecting signal, together with the rolling load P, the position S of a rolling reduction cylinder 4, and the advanced distance L of the sheet 1 detected by a pulse detector 7 are inputted to a calculator 9. The calculator 9 calculates a draft-position command ''0'' basing on those signals, and outputs the results to a servovalve 5 to automatically control the sheet thickness of the sheet 1 by driving the cylinder 4. Thus the high sheet- thickness accuracy is also given to the malformed parts T, B at the front and tail ends of the sheet 1, and a rolled sheet excellent in sheet-thickness accuracy is manufactured in high yield by cutting off only the malformed parts accurately. |
