Calculation Method of Loa4s on Skew Roll Mill for Web Expansion of H-Beam

摘要

In order to select adequate rolling conditions for the web expansion of H-beams by the new beam rolling mill "Skew Roll Mill (SKM) , a method of calculating loads on 5KM is proposed in this study. First, the equation of the mean compression stress during the thickness reduction at both ends of the web is theoretically introduced using both the balance equation of lateral stresses and the yield criterion by assuming the plane strain state. Secondly, experimental equations of the boundary stresses are established on the basis of plasticine-model and hot-rolling-model experimental findings. Moreover, an equation of the mean roll pressure is given by proportionally combining the theoretical equation of the mean compression stress with the experimental equation of the boundary stress. As a result, equations of the radial force are introduced using the mean roll pressure. Then equations of the thrust force depending on the radial force, the strain stress and shear stresses are introduced. The rolling torque can be calculated using the radial force and the thrust force. Results calculated using this model under various rolling conditions, including the geometrical relationship between the roll and H-beam, and the rolling temperature, agree well with hot-rolling-model experimental data.