Calculation of temperature and thermoelastic stresses in strikers during production of hollow steel billets in a unit of combined casting and deformation. Part 2

The article solves the problem of determining thermoelastic stresses in calibrated strikers in a unit of combined casting and deformation during production of hollow steel billets using the calculation methodology developed by the authors. The authors substantiate the relevance of determining thermoelastic stresses in insulated strikers when compressing the wall of a hollow billet and at idle run when cooling the strikers with water, and describe the striker geometry to produce a hollow billet in one pass. The paper considers the initial data and temperature boundary conditions for calculating the temperature field of the striker during production of hollow billets in a unit of combined casting and deformation. The boundary conditions are given to determine the striker temperature as well as the values of heat flow and effective heat transfer coefficient. The results of calculating the temperature fields are performed in four sections and are presented for characteristic lines and points located on the striker contact surface and in the contact layer at a depth of 5 mm from the working surface. Dimensions of the finite element grid are given to calculate thermoelastic stresses in calibrated strikers using the finite element method with ANSYS package. The authors determined the magnitudes and patterns of distribution of thermoelastic stresses in a calibrated striker when compressing the wall of a hollow billet and at idle run when such a billet is produced in one pass in a unit of combined casting and deformation. Based on the calculated temperature values and the magnitude of the maximum compressive thermoelastic stresses on the contact surface of the strikers, it is proposed to use a pipe billet as a material for making strikers.