Modelling of the stress-strain state during levelling sheets on sheet straightening machines with tension

Abstract

Pozhidaev A.V., Gribkov E.P., Berezshna O.V.
Modelling of the stress-strain state during levelling sheets on sheet straightening machines with tension

The development of metallurgical products is moving towards the creation of increasingly stronger grades of steel, which in turn requires the development of new processing technologies and equipment for metal rolling. Tension levelling through alternating bending is particularly relevant for thin sheet metal, where conventional multi-roll machines do not achieve the desired results to meet the continuously increasing quality demands of consumers. To address this issue, various approaches exist, such as numerical and finite element modeling methods, each with their own advantages and limitations. A review of existing sheet levelling models has shown that the effect of stretching is not accounted for in them. Therefore, this study investigates the effect of tension magnitude during levelling on a levelling machine and its impact on the stress-strain state of the levelled sheet metal. The aim of this work is to study the stress-strain state of sheet metal during tension levelling with alternating bending. The research on tension levelling with alternating bending was conducted using finite element modeling software in the Abaqus CAE environment. A finite element model of the sheet levelling process with tension was proposed. The effect of sheet tension level on the stress-strain state of the sheet was analyzed. During experimental modeling, equivalent strains across the sheet section were compared during levelling in a roll levelling machine, both without tension and under varying degrees of tension. It was found that increased tension raises the strain level on the third roll. The proposed finite element model can be used to determine the optimal settings for the working rolls of the levelling machine. The study concludes with an obtained relationship between sheet deformation and tension during sheet metal levelling.