Program control of the annealing process with utilization of the indirect measurement

By the thermal processing of the metals we can achieve the principal changes of their microstructure and likewise also principal changes of their mechanical and physical properties. When choosing a suitable heat processing for a specific application we rise from the required properties and knowledge about structural changes which are in the progress in the thermal changes. The solution of the speed up problem and increase heating quality of the metals belongs to the basic development trends of the thermal technique in the all industrial advanced states. The choice of the suitable mode of the metals heating is the problem that we also have in the steel coil annealing. In this paper is described program control of the steel coil annealing. The task of the program control is to ensure required behavior of the inner indirect measured temperature obtained from the system of the indirect measurement during which time control process variable is directly measured atmosphere temperature. Presented method rises from analyze of existence dependencies between atmosphere temperature and temperature inside the coil. The proposed control algorithm was verified with utilization of the simulation model for annealing process of the steel coils which is based on the system of indirect measurement of the inner temperatures.