Calculation of roll calibration of rolling-forging mills using the rolling pattern “smooth drum - circle”

Methods for calculating roll parameters of rolling-forging mills and their calibration with the use of the patented process of step rolling of round profiles and roll calibration used are discussed. This scheme of step rolling and calibration provides significant simplification of the roll manufacturing technology and the increase of productivity of the step rolling process. The working surface of rolls contains crimping and caliber parts, and a transition region located between them. The crimping part of the roll is formed with a variable radius relative to its axis of rotation and has a smooth working surface. The caliber part of the roll is made with a constant radius relative to its axis of rotation and has a rounded groove. In the transition area the shape and size of the groove gradually change from the smooth working surface to the rounded groove. Using known patterns of step rolling, a complex of analytical functions was obtained, which allows to calculate roll parameters, the shape and dimensions of their working surface on each part. As an example of the use of the algorithm and the program, the results of calculation of roll parameters and their calibration for the mill SS 200 are presented. Investigation results can be used in the design of the rolling technology with the use of existing and newly developed rolling-forging mills.