GB952135A - Rolling mills - Google Patents

Abstract

952,135. Rolling. UNITED ENGINEERING & FOUNDRY CO. March 2, 1962 [May 3, 1961], No. 8174/62. Heading B3M. In a strip rolling mill having roll chocks secured to each roll mounted in housings carrying roll positioning means for one of the rolls, means are provided for imposing bending forces to each end of the adjustable roll so as to curve its axis, and a further means is provided for relieving the adjusting means of any loading due to said bending force. Referring to Figs. 1 and 2, a typical 4-high strip mill is shown in which, however, extensions are provided on the ends of the back-up rolls 20, 21. Each extension carries a bearing yoke 26 which is rotationally constrained by two hydraulic units 32, comprising a piston 32a connected to the upper bearing yoke and a cylinder 32b connected to the lower bearing yoke. The pass is adjusted by means of two screw jacks, one in each housing acting on the top back-up roll 20. Pressure is applied to the hydraulic units 32 in such a direction as to force the backup rolls apart, thereby bowing the back-up rolls so that they apply maximum back-up pressure to the work rolls at their mid-point. Referring also to Fig. 5, the reaction to the applied bending force is carried by a number of hydraulic units 45, 46 placed between the roll chocks 22 and the main frame 11. In the embodiment described, six hydraulic units are grouped for taking the reaction at each chock, and by supplying pressure to these from the same source as the bending force units 32 and having the total reaction piston area equal to the area of pistons 32a, a correct total reaction force is assured. Fig. 8 shows a modification in which the reaction units 73 having been accommodated on the back-up roll extension shafts.