rolling force

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1 - Simulation of Steel Sheets Cold Rolling in Sticky Friction Conditions to Reduction of Scrap and Tools Wear
Arab N

Rolling is a common method for production of metallic parts in various shapes and sizes. In this method, the raw material placed between two rigid rolls until take the shape and size. There are two rolling methods, hot rolling and cold rolling. To achieve higher mechani چکیده کامل

Rolling is a common method for production of metallic parts in various shapes and sizes. In this method, the raw material placed between two rigid rolls until take the shape and size. There are two rolling methods, hot rolling and cold rolling. To achieve higher mechanical properties, and better surface quality and dimensional accuracy, the hot rolled sheets undergo the cold rolling process. The friction between the metal and rolls affects the forming process, increase the required load for forming, reduce the surface quality and increase the wear of tools. The simulation of rolling process will be helpful to improve the forming procedure and quality of products. In this research, the Finite Element method is used to model, simulate and analysis the rolling process of St 37 steel sheets in sticky friction plane strain conditions. Because of stress strain behavior of material during the forming process and increase of frictional stress due to forming process, the analysis of forming load between the contact surface of rolls and sheet are shown by simulation. Finally, simulation of forging process as a friendly tool can reduce the scrap rate, tools wear and environmental effects of scraps. پرونده مقاله

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2 - Analytical Modified Model of Cold Rolling Process and Investigation of the Effect of Work Roll Flattening on the Rolling Force
Mohammad Heydari Vini Pedram Farhadipour

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, fo چکیده کامل

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. پرونده مقاله

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3 - A New Temper Rolling Force Model for Dry Thick Strip Considering Fully Elastic Contact
Pedram Farhadipour Mohammad Heydari Vini Sayed Mohammad Reza Loghmanian

Temper rolling or skin pass rolling is one of cold rolling processes composed of a horizontal pass cold rolling mill stand. In this process, the thick strip is subjected to very light reduction (0.5–4%) in thickness in the presence of high friction amplitudes. One چکیده کامل

Temper rolling or skin pass rolling is one of cold rolling processes composed of a horizontal pass cold rolling mill stand. In this process, the thick strip is subjected to very light reduction (0.5–4%) in thickness in the presence of high friction amplitudes. One of the basic parameters of strip rolling processes is temper rolling force. A new rolling force model has been proposed for temper rolling strip mill considering the inhomogeneous stress distribution along the thickness of the strip. The contact between rolls and thick strip is totally elastic. The deformation field consists of an elastic (actually elastic) zone and that is highly non-homogeneous across the thickness of the strip. Totally elastic formulation can be used to predict the roll force. It can be used to study the stress distribution along the thickness of strip. The computing results from this model coincide the similar presented results in previous investigations done. پرونده مقاله

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4 - Using Artificial Neural Networks to Predict Rolling Force and Real Exit Thickness of Steel Strips
Mohammad Heydari Vini1

There is a complicated relation between cold flat rolling parameters such as effective input parameters of cold rolling, output cold rolling force and exit thickness of strips. In many mathematical models, the effect of some cold rolling parameters has been ignored and چکیده کامل

There is a complicated relation between cold flat rolling parameters such as effective input parameters of cold rolling, output cold rolling force and exit thickness of strips. In many mathematical models, the effect of some cold rolling parameters has been ignored and the outputs have not a desirable accuracy. In the other hand, there is a special relation among input thickness of strips, the width of the strips, cold rolling speed, mandrill tensions, required exit thickness of strips with rolling force and the real exit thickness of the rolled strip. First of all in this study, the effective parameters of cold rolling process modeled using an artificial neural network according to the optimum network achieved by using a written program in MATLAB. It has been shown that the prediction of rolling stand parameters with different properties and new dimensions attained from prior rolled strips by an artificial neural network is applicable. پرونده مقاله

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5 - Investigation and Simulation of Wire Non-Asymmetric Rolling Process
علی پرویزی بهزاد پسوده کارن ابری نیا

The non-asymmetric rolling process of copper and brass wire has been simulated with the Abaqus software. Presented finite element model in this simulation of rolling predicted output curvature and contact surface width in the non-asymmetric mode (in equality of diameter چکیده کامل

The non-asymmetric rolling process of copper and brass wire has been simulated with the Abaqus software. Presented finite element model in this simulation of rolling predicted output curvature and contact surface width in the non-asymmetric mode (in equality of diameter of rollers, the rotational speed of the rollers and the rollers’ surface finish). The material used in this research has strain hardening property. To evaluate of this study, obtained results are compared with analytical results of other researchers. Comparing the good coincidence of these two methods. پرونده مقاله

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