Research Of Virtual Finite Element Simulation In The Rolling-Process Of Cold-Rolling Pilger Mill

As the "aorta" of nuclear power plants,nuclear pipelines are important equipment for ensuring nuclear safety.The bending process is a difficult problem in the field of pipe forming technology.This paper mainly deals with the defects of cross-section distortion and springback caused by the main pipe and wave tube of CAP1400.Under the complex temperature and bending process parameters,the numerical simulation and control research on the comprehensive formability of large-diameter thick-walled pipe is carried out.Firstly,the theoretical analysis of the whole process of tube temperature forming is carried out,and the theoretical calculation formula of the minimum wall thickness reduction rate outside the tube blank,the maximum wall thickness thickening rate inside the tube blank,the ellipticity,the rebound angle and the bending moment are derived.And the quality evaluation standard for the temperature forming of the main pipe and the wave tube is given.Secondly,the finite element model of the main process of the main pipeline and the undulating tube is formed by MSC.Marc.The finite element simulation results are summarized and compared with the theoretical calculations to verify the correctness of the finite element model.The main pipe and the wave tube obtained by the traditional temperature bending process do not meet the precision requirements of the product,so the temperature bending process needs to be optimized.In view of the fact that the precision of the main pipe and the fluctuating tube is not satisfactory,the pipe wall thickness optimization scheme is proposed by using the anti-deformation principle of the material.In order to solve the problem that the ellipticity of the pipe temperature forming is too large,a flexible mandrel is added for the pipe.The program,and the conclusion of regularity,provides a meaningful reference value for actual production.Finally,combined with Visual Basic,MSC.Marc was developed twice,and a set of CAP1400 main pipeline and wave tube temperature and bending parameters optimizationdesign simulation system was developed.The system is mainly for parameterization of product model,theoretical calculation after product forming,The four parts of the main pipe and the undulating tube temperature bending finite element simulation simulation and the simulation result visualization are developed.These four parts are inextricably linked and indispensable.The four parts work together to make the product highly efficient.High quality research and development provides protection and has very good use value.