| 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 as every modern science and technology.There is obvious metal flow in tube reducing. Based on the calculation of rolling pressure after study on 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 determined by analysis on the law of metal flow in reducing deformation, so it's worth of studying for working out a reasonable tube reducing technology.Rolling process of raw tubes reduced by 5 slight stretch reducing mills from 733.17*20.50 to 720*20.70 were analyzed with classical rolling deformation theory and plastic-elastic 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.Strain and stress distribution, rolling pressure and thickness changing law obtained by FEM matches well with reality and can give good explanation to phenomenon of non-uniform wall thickness, therefore it's effective to use 3D plastic-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 production process.By using ANSYS software to do static analysis for the mill housing, the deformation and stress can be obtained, the dangerous point of the mill housing can be found and do optimum design for the mill housing; do dynamic analysis to obtain the natural frequency and vibration modal of the mill housing, and the vibration of the mill housing types, such as vibration source judgement is of great significance.
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