钢管定减径过程的理论计算研究及有限元模拟分析-材料科学与工程专业论文.docxVIP

重庆大学硕士学位论文 重庆大学硕士学位论文 英文摘要 ABSTRACT As the finishing step in hot rolling of seamless steel tube,reducing technology decides the end product rate and quality．It is the development trend of steel tube reducing technology to go through from empirical analysis to quantitative analysis every modem science and technology． There is obvious metal flow in tube reducing．Based on the calculation of roiling pressure after study strain and stress distribution，it can help to make proper choice of rolling mills，profile and strength of rollers；dimensional relationship between raw tube and its end product can be detcrm ned by analysis the law of metal flow in reducing deformation，SO its worth of studying for working out reasonable tube reducing technology． Rolling process of raw tubes reduced by 12 slight stretch reducing mills from 219奉6．55 to 19446．8 were analyzed with classical rolling deformation theory and plastic-elasfic FEM．Thus，the wall thickness and rolling pressure of each mill were calculated by engineering method，3D metal flow is visually simulated by ANSYS／LS—DYNA；the result of engineering calculation is verified by experiment data tO establish roodel． The experimental data of wall thickness at both ends were approximate to the theoretical values and FEM analysis．As wall thickness has effect on the product rate， engineering calculation is practical to wall thickness control at both ends and arrangement of rolling line；strain and slless distribution,rolling pressure and thickness charting law obtained by FEM matches well、)l，im reality and can give good explanation tO phenomenon of non-uniform wall thickness，therefore it’S effective tO rise 3D plastie—elastic FEM in analysis of tube reducing process．Practical wall thickness model has been established by regression on major effect factors，and it plays an important and practical role in actual pmduction proces