LOAD AND STRAIN STATUS OF CCM BACKUPS AND STRIPE DEFORMATION AT PRODUCTION OF STEEL SHEETS FOR WELDED PIPES. REPORT 2

Abstract

The main loads acting on the backup-walls of the assembled  mold of the combined continuous casting and deformation unit in production of steel sheets for welded pipes are described. The technique  for determining the total stresses in backup-walls of the installation of  the compression forces and the temperature load is given. The temperature boundary conditions for determining the temperature fields in  the backup-walls of the assembled mold of the unit for steel sheets for  welded pipes production are depicted. The dependence for determining the heat flux density of the deformation center hot metal influencing working surface of the backup-wall during workpiece drafting is  considered, as well as the technique for determining values   of effective  heat transfer coefficients for backup-walls cooling by water. The procedure for determining temperature fields and thermoelastic stresses  on backup-walls of the installation is described using the ANSYS  package. The article considers the initial data for determining temperature fields and thermoelastic stresses in backup-walls of the assembled  casting mold of the installation. The results of temperature fields and  thermoelastic stresses calculation are achieved in five sections of the  backup-wall and are provided for the typical lines. The nature of temperature distribution along the backup-wall thickness during cooling  by water at idle and at contact with the workpiece during its compression is shown. For the calculated temperature fields, axial and equivalent stresses, that arise in the backup-walls without channels when the  workpiece is drafted and cooled with water at idle, are determined. The  values   and regularities of distribution of axial and equivalent stresses  along the thickness of the contact layer and along the height and thickness of the backup-walls during drafting of the workpiece and at idle  are presented. The values   and regularities of the distribution of total  axial stresses along the thickness of the contact layer, the height and  thickness of the backup-walls from the drafting forces and the temperature load are given.