Numerical Simulation And Parameter Optimization For Tandem Rolling Process Of Seamless Steel Tube

The equipment, Multi-Stand Pipe Mill which is used to process seamless steelpipe by tandem rolling, is called MPM for short. With the social development andprogress, more high-quality seamless steel pipe are demanded to meet a variety ofproduction requirements. The rolling technology is a key part of the processmachining seamless steel tube. The advantages and disadvantages of the passparameters for the roll of MPM affect the quality of seamless steel pipe. It issignificant that selecting the parameter combination accuracy and improving thequality of seamless steel tube, which could creat good qualifications for the best workstate of MPM. In this paper, Research on the subject is the MPM equipment whichstands a steel plant in a Iron&Steel Group. Influence of the rolling tube formationprocess is researched by using theoretical and experimental methods. Reliable data areprovided for numerical simulation and parameter optimization.An experiment is completed by using the MPM equipments and experimentalmaterial which is on-line capillary. Online monitoring data of each rack rolling forceare received. The theory, pipe rolling of seamless steel and calculate the theoreticalanalytical value of the rolling force of a single pass parameters corresponding to thedifferent levels of value and draw the curve of the rolling force, is researched.MPM’s3D model and finite model are created. The corresponding boundaryconditions of the geometric model are exerted, and then they are submitted in the nextstep and the results are gotten. Comparing the error (the maximal error is23.67%)between the rolling force of numerical simulation and experiment and the error (theerror is in the below of22.9%) between the analogue value and theoretical value ofrolling force of the first rack when a single factor changes, the model of numericalsimulation is rational is verified. Improvement of the accuracy of pipe size is chose as the optimization objective,meanwhile, reduce the rolling force and rolling moment is selected as the secondaryindicators. In order to achieve both goals, the orthogonal simulation test optimizationmethod is applied. The five factors, the release angle, the release radius ratio, theradius of the fillet radius, eccentricity, friction coefficient between the rolls and therolling member, are identified in the orthogonal simulation test. Each of these factorsdetermines4levels. In doing this, an orthogonal simulation test sheet, whose size isL16(4~5), is acquired. According to the experiment scheme, the orthogonal simulationtest is performed. The influence rules of capillary dimensional accuracy and rollingmill mechanical parameters of the five factors respectively are obtained by theanalysis of the test result. Then, the order of the factors is got by the ultimate of therange method. Taking the influence rules and the order in to consideration, the optimalassembly parameter is picked up.Finally, a finite model is established by application of optimal assemblyparameter. The results, which contain the stress-strain field, temperature field, thedistribution curve of rolling force, and improvement of the dimensional accuracy ofthe billet tube, are achieved.