GB1219966A - Strip processing apparatus - Google Patents

Abstract

1,219,966. Straightening; tensioning; altering physical properties. HEAD WRIGHTSON & CO. Ltd. 21 July, 1969 [30 April, 1968], No. 20448/68. Headings B3E and B3V. A method of processing metal strip by stretch levelling comprises the steps of passing the strip through two sets of driven bridle rolls 1-4 and 5-8; advancing the strip at different rates to tension the strip between said sets of bridle rolls, subjecting the strip to the action of further roll means to roll and flex the strip first in one direction and then in another said roll means including at least one float roll 11 supported in a gap between two further idler rolls 9, 10 by a loop in said strip embracing said one roll such that the strip is subjected to bending stresses which in combination with the tension stresses subject the strip to plastic strain over the major part of its thickness, the ratio of thickness of the strip to the diameter of this roll not exceeding 0À04. The idler rolls 9, 10 can be separated to permit roll 11 and its surrounding loop to be passed between them during threading of the machine. In another embodiment, a set of three drag bridle rolls 11-13 and a set of four tension bridle rolls 14-17 are driven from a common gear-box and differential. Two float rolls 12, 13 are provided the roll 13 being inverted to ensure a symmetrical treatment of the strip. Back-up idler rolls 18-19 and 20-21 co-operate respectively with float rolls 12-13.