Coupled thermal deformation analysis considering strip tension and with/without strip crown in coiling process of cold rolled strip

A new model for heat transfer and thermal deformation analysis according to with/without strip crown in coiling process has been proposed. Finite difference analyses for heat transfer of cold rolled coil have been carried out using the concept of equivalent thermal conductivity in the radial direction which is a function of strip thickness, surface characteristics and compressive pressure. The compressive pressure is calculated from an equation expressed as a function of hoop stress and coil tension, considering crown strip profile obtained by experiment. Finite element method for thermal deformation of cold rolled coil has been performed to investigate the effects of the strip crown, the coil tension and temperature. From these analyses, it is found that the axial inhomogeneity of thermal deformation is increased as the strip crown, compressive pressure, and temperature drop in cold coiling process increase.