FEM Simulation On Continuously Rolling Process Of PQF And Optimization Of Tension System

Tension system has an important influence on the dimensional accuracy of continuous rolling steel pipes This paper combines the production of a 0460mm PQF production line of a steel pipe plant,uses the nonlinear finite element simulation software ABAQUS to establish a three-dimensional thermo-mechanical coupling finite element model and simulates the actual continuous rolling process.The control variable method was used to study the influence of different roll speed,mandrel speed,friction coefficient of mandrel and inner wall of steel pipe on rolling force and axial stress uniformity.In order to optimize the rolling state,a continuous rolling process optimization scheme is proposed.The specific research contents are as follows:(1)According to the equipment parameters and on-site production data of ?460mm PQF unit,establish the three-dimensional thermo-mechanical coupling finite element analysis model of seamless steel pipe three-roll continuous rolling process by using ABAQUS software.Determine key boundary conditions and simulate and calculate the seamless steel pipe rolling process.(2)The stress field,equivalent strain field,metal flow law and temperature field distribution during the continuous rolling process of seamless steel pipe were studied.The causes and laws of tail defects and wall thickness unevenness were analyzed.(3)The data of pierced billet size and temperature field obtained by simulation are compared with the actual data in the field to verify the calculation accuracy of the ABAQUS model established in this paper.(4)Using the control variable method to change the roll speed system and the friction coefficient between the mandrel and the inner wall of the steel pipe,establish series of test models,provide a large number of simulation calculations,and compare the calculation results to study the effect of speed-tension system on key force parameters and wall thickness of steel pipe during rolling process;(5)Based on the simulation calculation results,combined with the actual field proposal,the process optimization scheme including roll speed,mandrel speed and friction coefficient is provided,and the simulation calculation is provided.The tension distribution,rolling force and steel wall thickness accuracy before and after optimization are compared to prove the proposed optimization scheme in the paper is reasonable.