Influence of roll geometry and strip width on flattening in flat rolling

Abstract

The size of local roll flattening and its distribution along the direction of the roll axis in flat rolling were calculated by means of 3‐dimensional finite element method. For analysis of elastic flattening deformation of the roll stack the well‐known classical and analytical solutions are usually employed which were derived from elastic half space theory or two dimensional contact theory. By comparison of results from both the different methods the validity of the classical formulae was examined. Some of the formulae are more appropriate for calculating local flattening along the work roll/strip interface, however, they may result in a great deviation in calculating the flattening along the work roll/ back‐up roll interface, especially for the back‐up roll. Using the Fe model the influence of roll geometry and strip width under a specific rolling force on the flattening was taken into account, which is difficult to be treated with classical models.

A computational method to predict strip profile in rolling mills

“…Shifting and crossing mechanisms are modeled with the presented method by adjusting the model geometry and modifying the elastic foundation modulus accordingly. Roll bending is accommodated by providing corresponding load values to the forcing vector f. Although the analytical plane-strain and elastic half-space solutions for the flattening between rolls do not account for the length-to-diameter ratio of the rolls, nor for any specific axial loading position, these effects are accommodated by the elastic foundation moduli since they are indeed functions of axial position x. Zhou et al compared the classical analytical formulae for contact between rolls with three-dimensional finite element simulations using a traction boundary condition on a single roll (Zhou et al, 1996). They noted various differences between the FEM solutions and the classic solutions when studying the effects of strip width, roll diameter to length ratio, and rolling load intensity.…”

Modification of Roll Flattening Analytical Model Based on the Plane Assumption

“…Then, the mechanics of the cold strip rolling was analyzed based on the model. Zhou et al [21,22] [23][24][25][26][27] analyzed the error of semi-infinite body model in roll calculation and proposed an analytical model in flat rolling by boundary integral equation method. Wang et al [28] used the 3-D elastic-plastic FEM to simulate the thin strip rolling process of UCM cold rolling mill.…”

A Method to Analyse of Roll Bending Force Effect Rate in 4-High Hot Strip Mill

“…Recently, some new technologies such as schedule free rolling [1][2][3][4][5][6] and strip profile controlling [7], were applied in the field of hot strip steel rolling production. With the further improvement and widely application of Automation Gauge Control [8], the strip gauge control has reached a high level.…”