International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Analysis for Stress Prediction in Hot Rolling with Different Process Parameters by Finite Element Method Bashishth Kumar Kushwaha 1, B.Moharana2 1Department of Mechanical Engineering, Roorkee Engineering & Management Technology Institute, Shamli, India 2 Department of Mechanical Engineering, DR. B.B.A Government Polytechnic, Karad, (Silvassa),India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract – In hot rolling mill process the rollers is subjected
through the data interactive software Mech/pro to analyze its stress, and then carry out the FEA of the model loaded in ANSYS. After Comparing with the material yield limit, the both stresses are reasonable which will meet the demand of design. This co-simulation method provides a reliable basis for vertical roller mill design and can also be applied to other mechanical system design process [8]. A coupled thermomechanical finite element method computation on steel pipe rolling process, gets the residual stress and strain change rule in the rolling process. They analyzed the influence of roller spacing and velocity parameters on residual stress and strain, which provides a reliable theory basis for improving the performance of hot rolling seamless steel pipe and the optimization of rolling technological parameters [9]. The roll cross angle, rolling press quantity, intersection position and rolling speed can change the size of the axial force, axial forces may float small by the pressing ratio increases, lager by rolling speed increases, bigger by adding more far intersection point position, This conclusions have realistic significance in cross rolling schedule making, and provide basis theory reducing rolling axial force [10]. The ring can approximately maintain its round shape at the initial rolling period, when the process is entering the medium period, the roundness of the ring becomes worse, and it tends to be improved at the final rolling period. A series of ring rolling experiments were conducted. So the reliability of the finite element model of the vertical hot ring rolling process with measurement and control was validated [11]. The formation of edge defects in hot strips, resulting from slab corner cracks generated in continuous casting. They developed a model-based concepts for the identification of such initial slab cracks. To accomplish this task a systematic finite element tool Deform-3D was utilized. The numerical results clearly pointed out the significant morphological changes of the cracks during rolling and afford valuable indications for a deeper understanding of the underlying process details [1214]. A two dimensional elastic plastic model was used to simulate the cold rolling of thick strip. They found the speed and diameter of rolls have influence on the quality of rolling products [15]. The mechanical properties of high strength steel and mild steel at elevated temperatures. They found that yield strength, tensile strength and elastic modulus of steels at elevated temperatures decreases [16]. The investigating the mechanism of thermal crack growth while taking into account the complex thermal and mechanical interactions during the rolling process. They utilized the concepts of FEM for the estimation of rolls life, from the
to heating and cooling cycles with different processing parameter. This nature of heat and processing parameter found some cracks, wear and tear in hot roller. In this work, the study of existing process was done to find the root cause of the cracks in roller mills. The analysis of the rolling process was done and results obtained in terms of equivalent stress and effective plastic strain. It has been found that mill speed and friction coefficient are the two major factors that significantly affect the quality of rolling products. Lower value of friction coefficient requires that number of mill passes be increased. Higher value of friction coefficient increases the sticking between rollers and the incoming metal leading to defects in steel angle bar. Key Words: Hot Rolling, Cold Rolling, Cracks, Coefficient of Friction, Stress, Strain
1. INTRODUCTION The sizing press followed by horizontal rolling is more efficient in width reduction than deformation by a heavy edger mill followed by horizontal rolling. The finite-element analysis results for the deformation of a slab also show reasonable agreement with measurements from an actual mill test, and from physical modelling experiments [1]. The effects of process parameters such as the cooling condition of the work-rolls, the rolling speed, and the roll metal interfacial heat-transfer coefficient on the temperature distributions in the work-rolls as well as in the rolling metal. The comparison between the model predictions and experimental results shows the validity of the proposed model [2]. The rapid development of computer technology and the improvement of general finite element analysis software, especially with the development of parallel computing technique, it has become possible to analyze cold strip rolling process and calculate the strip deformation with 3-D finite element contact model of rolls and strip [3]. The temperature of H-beam was a downward trend in the hot rolling process, however, local temperature display rising trend, uneven deformation of flange lead to more complex temperature distribution, there is certain correlation between equivalent plastic stress and temperature distributions, increasing of equivalent plastic stress as the temperature increases, research results can provide theoretical basis for rolling regulations and reference of the production of hot rolling for H-beam [4-7]. The vertical roller mill 3-D model established in Pro/E is imported into ADAMS
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