Pass Design And Optimization Of LX80A Cord Steel Based On CARD System

With the rapid development of computer industry,other industries can also use computers to improve production level and efficiency.At present,the demand for cord steel in the market is rising,and the competition among countries to improve its tensile strength is also growing.When rolling steel,the computer can effectively improve the level and efficiency of rolling.at this time,the computer aided pass design system came into being and developed towards a more intelligent direction.This thesis is studied under the background of relevant problems in the field rolling process of a steel plant.According to the preliminary analysis of the field situation,the problem is that some passes are overfilled,and the overall elongation coefficient is set unevenly,which leads to ears,which are then folded on the finished product.After pickling,the surface macro defects appear as cracks.At the same time,in order to open the window of pass design by computer,so as to compete with products from other countries in the future.Finally,in response to the call of national carbon neutral and carbon peak,further analyze the feasibility of reducing energy consumption.In the development of the system,it starts from the initial design ideas,specifically to the modules and implementation methods contained in each part,and finally designs the CARD system.The use of one-dimensional search method is to optimize the numerical value in the interval by Usatowski broadening.In order to ensure the accuracy of the calculation of the sectional area,an integral method is proposed to calculate the sectional area of the red billet in the box hole.All scheme parameters are calculated for screening by using the strategy of breaking up the zero into the whole,and the minimum energy consumption value is selected by using the dynamic optimization method.The system connects Excel and secondary develops Auto CAD to output rolling parameters and pass drawing respectively.This pass design system is used to design the first 18 passes of LX80 A cord steel according to the site conditions,and a set of passes with uniform deformation is calculated.In the design process,DEFORM software is used to simulate the rolling process,mainly focusing on the pass fullness,rolling speed and section shape,and conducting side analysis on the equivalent stress and rolling force.As far as the calculation of force and energy parameters is concerned,the LX80 A is subjected to thermal simulation experiments to obtain accurate data,and nonlinear regression analysis is conducted to obtain the constitutive equation for calculating deformation resistance.During the design process,it was found that the filling degree of square hole had an impact on the stability of rolling,and 95% of the filling degree was selected through analysis.Through simulation,a group of schemes that the rolling speed conforms to the production reality,the equivalent stress distribution is good,the existing rolls can meet the production rolling force demand,and the section size deviation is small are selected for field experiment.Through the comparison of field data,this pass can be rolled normally,and this pass improves the defects caused by excessive reduction of some passes,optimizes the filling degree of each pass.The section height width difference of the 14 th cut sample is 1.1 mm,meeting the production requirements,and the overall energy consumption is reduced by 1.73%.The qualification rate of initial inspection of surface cracks increased from 92.6% to 95%,and the objection rate of rolling fold,cracks,scratches and other defects decreased from 0.1% to 0.034%.