Coupling Theory And Computing Of Velocity Field And Temperature Field Of Workpiece

Temperature is an important factor of influence metal's deformation and material's per-formance in rolling process, moreover, it often goes with temperature's transformation when the metal is happening deformation. In addition, the plastic work also translate into hot, there-fore, it is very necessary that temperature and deformation are coupled to carry through integrative simulation computing in order to improve the precision of numerical computing about rolling process. Finite element simulation computing of the thermo-mechanical coup-ling of flat hot rolling process is considered with the aid of rigid-plastic FEM model in the paper. Following are the main contents:(1) Solving of the side free surface's figure. The spread of nodes in the free surface are calculated by making use of integral along the flown line, the rolled spread is obtained by iterative addition with regard to the spread of nodes. In iterative computations, the calculated spread is used to amend coordinates of nodes in width, by which can revise basal computing data and improve the computing precision.(2) Calculation of three dimensional temperature field in rolling process. The tempera-ture field is solved according to linear or non-linear boundary condition of the free surface, and comparison of calculated results of linear and non-linear is analyzed. On condition that the boundary is linear, the temperature field can be directly solved so as to avoid the iterative errors. Although non-linear boundary condition is actual, the iterative errors c an not be avoided, which impact convergent effect.(3) Coupling calculation of velocity field and temperature field of workpiece. A coupling simulation calculation of velocity field and temperature field of workpiece is studied based on the FEM computing of velocity field and temperature field of workpiece. The combination se-quence of equations are adjusted to establish the current format of the simultaneous equations in the program. Corresponding program is compiled, and the computing precision of coupling is validated by using the on-site data.(4) Discussion of the solving methods of liner equations. LU decompounding method of the part selection of main element and QR decompounding method of nonselective main element are adopted to solve good-sized zonal dissymmetrical linear equations, and compa-rison of stability and computing quantity about them is carried out.