Automatic Modeling And Parameter Optimization Of PQF Continuous Rolling

PQF(Premium Quality Finishing)continuous rolling is an important process in the production process of seamless steel tube,it is also a multi-pass rolling problem that belongs to multiple nonlinear and thermal-mechanical characteristics.At present,many scholars use the finite element analysis method to analyze the PQF continuous rolling.However,most of the finite element analysis software do not target the development of specific categories of modules,there are a series of problems such as pre-processing modeling complicatedly and extracting post-processing data inconveniently in the modeling and analysis process,which is not conducive to the setting of the roll hole type parameters and the optimization of the process parameters.In this paper,the finite element analysis software ABAQUS is used as the development platform,the secondary development technology is used to develop a convenient and simple interface for PQF continuous rolling plastic forming numerical simulation module,which greatly shortens the development cycle of the new continuous rolling model.The main research contents of the thesis include:(1)According to the typical material of the rolling mill of a steel mill,the 294-hole PQF continuous rolling process is taken as the research object.According to the on-site process conditions,a thermal-mechanical finite element analysis model of PQF continuous rolling is established.(2)Using the established PQF continuous rolling thermal-mechanical finite element model,the Python language is combined with the ABAQUS software to encapsulate the script which generated during the CAE modeling process.At the same time,creating the interface through the Plugs-in in the ABAQUS menu bar to realize the interaction between the kernel and the interface,finally creating the parametric modeling module of PQF continuous rolling,which enables ABAQUS pre-processing to perform pre-processing operations such as automated geometric modeling,defining contacts,and meshing.(3)Based on the established PQF continuous rolling parametric modeling module,the numerical simulation analysis of the established continuous rolling model is carried out.Comparing the wall thickness simulation results with the actual continuous rolling data of the factory to prove the effectiveness of the development module.At the same time,the theoretically calculated rolling force is compared with the simulated rolling force,which further proves the reliability of the PQF continuous rolling model.(4)Based on ABAQUS,the post-processing function of the plastic forming process is not perfect during the simulation,it is impossible to directly obtain the wall thickness of the continuous rolling product.The ABAQUS post-processing is redeveloped.Using the cubic B-spline fitting curve,a new method for solving the lateral wall thickness is proposed and programmed using the Python scripting language to perform calculations in the ABAQUS finite element software.(5)The metal flow law,equivalent strain field and temperature change of the capillary during rolling were studied.The simulated PQF continuous rolling is to reduce the wall thickness unevenness of the continuous rolling tube,According to the orthogonal optimization method for the hole type parameters of a certain specification of the factory,the opening angle,the roll radius,the eccentricity and the coefficient of friction are selected as the influencing factors.The first frame optimization is taken as an example to obtain the optimal one.The parameter combination model improves the wall thickness accuracy to some extent.