Finite Element Modeling And Analysis Of Coiling Process Based On The Contact Characteristics Between Layers Of Coil

Strip coiling is a nonlinear deformation process with complicated factors.For a certain size of coil,there is a range of internal stress to make it stable,once beyond this range,the coil will show a variety of defects on the macro level,such as loose coil,telescoped coil,inner concave coil and so on.Therefore,it is of great significance to scientifically and reasonably study the changing rule of the internal stress of the coil during the tension coiling process for improving the quality of the strip and stabilizing the production.The finite element method is undoubtedly the most ideal method to accurately reflect the stress variation of the internal stress of the coil and the force of the reel during the strip coiling process,and to analyze the causes of the coil defects.However,most of the current finite element studies on strip coiling only focus on a coil with a few winding numbers,and these studies usually ignore the influence of contact friction and additional contact deformation between layers of coil on the coiling process.In this paper,MSC.Marc software is used to model the strip coiling process and an improved method is proposed to shorten the calculation time of the model.At the same time,the influence of two important contact characteristics between layers of coil,namely contact friction and additional contact deformation,is studied during the coiling process.These studies provide a reasonable finite element solution for the strip coiling,and explore a new research method for optimizing coiling process and improving product quality.The main research contents include:Firstly,the coiling process model was properly simplified according to the coiling equipment and its working principle,and the finite element model of the coiling process was established reasonably and improved according to the actual parameters of the coiler of20-high rolling mill;Then,by choosing the appropriate friction model and setting different friction coefficients,the finite element coiling model considering the contact friction between layers of coil is established,and the influence of the contact friction between layers of coil on the internal stress of the coil and the force of the reel during the coiling process is analyzed;Finally,considering the radial additional contact compression deformation caused by the rough surface profiles of the strip during the coiling process,the compression relationship of the additional contact deformation is determined by the lamination compression experiment of the strip.Based on this,the finite element model considering the additional contact deformation is established and its influence on the internal stress of the coil and the force of the reel during the coiling process is analyzed.