GB1354542A - Rolling of metal stock - Google Patents

Abstract

1354542 Rolling DEMAG AG 28 June 1971 [7 July 1970] 30134/71 Heading B3M The ratio of the speed of rolls of two successive stands in a continuous rolling mill is adjusted to take into account the tension produced by longitudinal contraction of metal stock due to temperature losses. Current inputs to the roll drive motors 5, 6, 7 are transmitted via lines 11, 12 and 13 to a computer 10 which determines the actual torque applied to the rolls of each stand. The computer then subtracts the actual torque value for each stand from the torque which would exist between the stock and the rolls of each stand assuming that no tension existed in the stock due to heat losses, the latter value being determined from signals fed to the computer by pressure gauges 8, 18, 19 and from stored data. Thus the increment of torque applied to the rolls of each stand due to the tension existing in the stock can be determined. Assuming the rolls 2 are reference rolls, speed increments are added to the speed of rolls 3 and 4, a larger increment being added to the speed of rolls 4 than to that of rolls 3. In addition the speed of all the rolls can be increased so that additional energy is fed into the stock so that resulting temperature losses are reduced.