Analytical Modified Model of Cold Rolling Process and Investigation of the Effect of Work Roll Flattening on the Rolling Force

Subject Areas :

Mohammad  Heydari Vini ¹ (Department of Mechanical Engineering, Mobarakeh Branch, Islamic Azad University, Mobarakeh, Isfahan, Iran)
Pedram  Farhadipour ² (School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16844, Iran)

Received: 2016-10-10 Accepted : 2017-02-03 Published : 2017-02-01

Keywords: Cold rolling, rolling force, Steel strip, Roll Flattening,

Abstract :

Cold rolling of steel is one of the most important metal forming processes so an accurate control ofits parameters during the process is necessary. In this paper, the friction coefficient has beenproposed as a function of cold rolling parameters such as forward slip, forward and backwardtensile stresses ,strip thickness, static deformation, resistance of strip before and after rolling ,stripvelocity before and after rolling and work roll diameters. A cold rolling model for computation ofrolling pressure and force with varying friction coefficient and work roll flattening is proposed. Thefinal results obtained from calculations were very close to the experimental results and there hasbeen a good compliance with this method results and other researches and this is the advantage ofthis model. Finally the rolling forces in two stands with three passes were measured. So, the resultsdemonstrated that an actual process in the two stand reversing cold mill by increasing the work rollflattening the rolling force increased considerably. Also, by increasing the tensile stresses at the endof the steel strip, the rolling force decreased.