MODIFICATION OF A CLASSICAL FORMULA FOR DETERMINATION OF ROLL FLATTENING IN FLAT ROLLING

Local elastic roll flattening in direction of the roll axis in flat ro lling is one of the important displacement components related to the r oll gap shape. Up to now some classical formulae to solve roll flatten ing have been proposed. These formulae were derived from the elastic h alf space theory or the 2-dimensional contact theory. On calculating t he flattening of the back-up roll they may result in a great deviation . In the present effort a comparison was made between the flattening r esults obtained by a 3-dimensional finite element method and by a clas sical formula. The relation between the deviation and the back-up roll geometry was also examined and therefore the classical formula was mo dified. Calculated results indicate that the modified formula can more accurately predict the back-up roll flattening.