Determination of contact pressure during double-t section rolling in a universal beam groove

Solution of the problem of determining contact pressures and rolling forces in a universal groove is presented using physical equations of linking stressed and strained states of metal in the deformation zone. The variational principle of full power minimum was used to state and solve the problem of determining stressed and strained states of metal during rolling a double-T section in a universal four-roll groove. Deformation of the neck and flanges was considered as rolling of rectangular beams on a smooth surface of rolls, assuming that drafting of flanges occurs from the vertical roll direction only. From the solution of this problem the components of the strain rate tensor and intensity of shear deformation were determined using known conditions of mechanics. A new theoretical method of calculation of contact pressures and rolling forces during rolling double-T sections in a universal beam groove was developed. Its reliability is confirmed by the results of experimental tests. The method of determination of contact pressures and rolling forces was implemented as a Mathcad software package program for calculations on a personal computer. Calculations of rolling double-T sections No. 35B1, 40K2 and 45B2 made of 15KhSND steel at a universal beam mill of JSC “NTMK” were performed for the experimental verification of this method. Comparison of calculated data with the results of experimental studies revealed an average error of 6.4 %.