Numerical Simulation Of Cold Rolling Process Of 301L Stainless Steel For Rail Vehicles

In recent years,with the rapid development of Chinese rail transit industry,market requirements for rail vehicles are increasing,and weight reduction has become the main trend of current rail vehicles.301 L stainless steel is widely used as the main structural part of the car body due to its excellent performance.However,in the cold rolling process of steel plates,the shape of the rolled plate is often affected by the imperfection of the cold rolling process,in this paper,a large-scale finite element analysis software ABAQUS is used to establish a cold rolling numerical simulation of 301 L stainless steel.Based on the actual production conditions,material parameters and geometric dimensions of the rolling mill,a cold rolling finite element model of 301 L steel plate is established and submitted to the job calculation.In the later results analysis,the method of controlling variables was used to study the influence of individual rolling parameters or ASU control parameters on the shape of the plate,the equivalent plastic strain,plate width transverse thickness deviation,and residual stress are used to determine the shape of the plate.The rigid roll model and the elastic roll model were used to analyze and calculate the influence of different rolling parameters on the plate shape,and the influence rules obtained by the two were basically the same.The numerical calculation results of the elastic roll model show that the front tension ranges from 105 MPa to 145 MPa.With the increase of the front tension,the rolling force decreases and the reduction decreases.When the front tension is 135 MPa,the 301 L plate The equivalent plastic strain in the width direction,the thickness deviation in the rolling direction of the plate width and the distribution of the residual stress after rolling are uniform,and the curve distribution is stable;the value of the back tension is 45 MPa to 75 MPa.The force is reduced and the reduction is reduced.When the back tension is 55 MPa,the distribution of the equivalent plastic strain in the width direction of the 301 L stainless steel plate,the thickness deviation in the rolling direction of the width and the residual stress after rolling are most uniform,and the curve fluctuates Smaller;the friction coefficient ranges from 0.06 to 0.1.With the increase of the friction coefficient,the friction force and rolling force increase,and the reduction amount also increases.When the friction coefficient is 0.1,the 301 L stainless steel plate The equivalent plastic strain in the width direction,the thickness deviation in the rolling direction of the plate width and the residual stress distribution after rolling are the most uniform,and the distribution curve is stable;the rolling speed ranges from 5.0 m/s to 10 m/s.At 7.5 m/s,the distribution of 301 L stainless steel plate's equivalent plastic strain in the width direction and thickness direction,the thickness deviation in the rolling direction and the residual stress after rolling are evenly distributed,and the distribution curve is the most stable.At the same time,in order to verify the reliability of the numerical simulation conclusion,the production line experiment was verified.By comparison,the numerical simulation results were consistent with the experimental results,indicating that the numerical simulation results in this subject have a guiding role in actual production.Due to the roll system deformation during actual rolling,the control of the flatness by rolling parameters has certain limitations.In order to make up for the lack of flatness control ability of the mill,the 20-roll mill is equipped with an ASU control mechanism.Through the numerical simulation,the shape regulation rules of the ASU shape control mechanism are studied.The series of simulation results are consistent with the online regulation rules of the ASU regulation mechanism,which proves that the optimization of the ASU regulation parameters can be achieved by numerical simulation technology.