Method for increasing the process stability during the hot rolling of steel or nonferrous materials

Abstract

The invention relates to a method for increasing the process stability, particularly the absolute thickness precision and the installation safety during the hot rolling of steel or nonferrous materials, with small degrees of deformation (fi) or no reductions while taking the high-temperature limit of elasticity (Re) into account when calculating the set rolling force (FW) and the respective setting position (s). The process stability can be increased with regard to the precision of the yield stress (kf,R) and the set rolling force (FW) at small degrees of deformation (f) or small reductions, during which the high-temperature limit of elasticity (Re) is determined according to the deformation temperature (T) and / or the deformation speed (phip) and is integrated into the function of the yield stress (kf) for determining the set rolling force (FW) via the relation (2) ) Re= a + e . phip, in which: Re represents the high-temperature limit of elasticity; T represents the deformation temperature; phip represents the deformation speed, and; a, b, c represent coefficients.

Description

technical field [0001] The invention relates to a method for improving process stability, especially absolute thickness accuracy and equipment reliability, when hot rolling steel or non-ferrous materials with small deformation or small reduction, when calculating the nominal rolling force and the corresponding Take into account the high temperature yield limit when adjusting the position. Background technique [0002] "Kraft-und Arbeitsbedarf bildsamer Formgebrugs-Verfahren" (Forces and Works Required for Plastic Forming Methods) by A.Hensel and T.Spittel, Leipzig 1978, and another by T. " Rationeller Energie-einsatz bei Umformprozessen " (reasonable energy utilization in the deformation process) of the publication of Spittel and A.Hensel, Leipzig, 1981 describes various methods for finding the nominal rolling force during hot rolling, This force is the product of deformation resistance and crush area. The resistance to deformation itself is determined as the product of th...

AI Technical Summary

Problems solved by technology

[0013] The disadvantage of the multiplicative formula used to find the yield stress is that as the degree of deformation <0.04 or the reduced function of the reduction is close to the yield stress and is zero MPa, that is to say, the function passes through the zero point (Fig. 1 represents according to the prior art)

[0018] Common to the described prior art is that the effect of small deformations or small reductions on the yield stress in the hot rolling of steel and non-ferrous materials is known for the calculation of the nominal rolling force and for the thickness The scope of the adjustment method is not correctly or only insufficiently taken into account or the transferability to other equipment is limited and thus presents a risk for process stability, especially for absolute thickness accuracy and equipment reliability

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