GB1350206A - Roll positioning means for a rolling mill - Google Patents

Abstract

1350206 Rolling mills WEAN UNITED Inc 20 Sept 1971 [18 Sept 1970] 44576/70 Heading B3M A rolling mill, of the kind in which the roll gap is initially set by an upper screwdown assembly and is kept constant during rolling by an hydraulic cylinder 23 located beneath the lower roll chocks, incorporates in each cylinder a bar spring 34 for sensing the position of the lower roll. The inner end of the spring is acted on (through a piston 28 which acts as an overload prevention device) by a piston 24 which follows movement of the lower roll. The centre of the spring is supported by a fixed fulcrum 37, while its outer end rests on a position transducer 39. Changes in the bar position (which reflect changes in the roll gap) are sensed by the transducer and used to reset the roll in its desired position, by controlling the hydraulic pressure in the cylinders. To reset the transducer 39, when the rolls are changed for example, motor-driven screwoperated jacks 42 are employed, the jacks for each spring bar being coupled together for synchronous movement. In an alternative arrangement, two bar springs may be located on each side of each cylinder (Figs. 3 to 5, not shown), and the modulus of each spring may be varied by a pair of nuts on a rotatable threaded shaft.