Patent ID: 7021105
Filing Date: 2006-04-04
Classification: B21B

Abstract:
1. Method to bend the rolls in a rolling stand, comprising: rotatably mounting each roll to be bent in two corresponding chocks associated with command actuators of double-effect type, wherein said command actuators comprises hydraulic jacks with hammer heads, positioned within a longitudinal groove made on the lateral side of the relative chock and able to cooperate both with an upper surface and a lower surface of the corresponding longitudinal groove made on the lateral side of the corresponding chock, controlling the bending of the roll to be bent using at least four of said hydraulic jacks for each chock, said at least four hydraulic jacks being positioned on opposite sides with respect to an axis of rotation (Y) of said roll, to provide both a negative and a positive bending of the respective roll, wherein said controlling comprises moving said hammer heads to contact one of the upper surface and the lower surface of said groove, and concurrently, to control the bending force applied to said roll in an area of indetermination (AI) around a point of passage between a positive and a negative bending: