Determining the metal pressure on the rollers of a longitudinal-rolling mill

Abstract

Usually, in calculating the metal pressure on the roller—for example, in longitudinal rolling—the projection of the metal‐roller contact area onto the plane normal to the resultant of that pressure is an important factor. Since in most cases this resultant is vertical, the projection of the contact area onto the horizontal plane is employed (Fig. 1) [1]. This method permits rapid and relatively accurate determination of the contact area for most cases of longitudinal rolling. However, in the deformation of strong steel on mills for periodic (for example, planetary) or simple longitudinal rolling, when the ratio of the metal‐roller contact length to the mean height of the deformation source l / h me ≤ 0.5, the contact pressure (or stress) takes very large values, and simplified determination of the contact area may lead to considerable error. Ultimately, at limiting loads, this may lead to premature bearing failure of the working rollers and fracture of the drive com