| 摘要 |
1286131 Rolling WESTINGHOUSE ELECTRIC CORP 6 Aug 1969 [27 Aug 1968 14 Oct 1968] 39335/69 Heading B3M A method and apparatus for operating a slabbing mill having work rolls 18, 20 and edger rolls 52, 54 comprises computing a schedule of rolling passes based on details of an ingot to be rolled and comparing the rolling loads and rolling torques obtained during actual rolling with values predicted in the schedule and increasing or decreasing the number of roll passes so that a final slab size is produced in the fewest passes within the mill constraints. The mill comprises an entry roller table 28 and a delivery roller table 36, the rollers of which are driven by motors 30 and 40 having speed sensors 33, 41 and control means 34, 42 respectively. The motors 22, 24 for the rolls 18, 20 have each a control means, speed sensor and voltage and current measuring devices. The latter give the measure of the rolling torque and rolling horsepower which are compared with predicted values for the schedule. The motors for the edger rolls have similar means associated with them and the edger roll speed is arranged so that these rolls do not contribute to the speed of the ingot through the mill. Means 46 on the delivery table side are used to turn the ingot on to its edge from its face and vice versa. An ingot to be rolled is first rolled in edge scale breaking passes through the main mill rolls 18, 20 and then turned on to its face for a series of flat roll passes. The edger rolls are used on the final odd pass, passes from entry to delivery side being odd others being even, and on even passes before that as few passes being used for edge rolling as possible. If the width of the final slab cannot be met by edge rolling on even passes only then odd passes are also used, starting from the next to last up to the first. If these are insufficient the ingot can be turned on edge in a turn-up edge pass through the main mill rolls. The schedule is calculated and updated by means of a digital computer. |
