ANALYTICAL MODEL FOR PREDICTING THE OPTIMUM HEATING CONDITIONS USED IN HEAT PROCESSING

Abstract

The decision to adopt a certain heating conditions must consider the need to avoid dangerous thermal stresses that could cause products deformation, especially those with complex configuration, or even damage to their integrity and at the same time a minimum value of heating time, with direct consequences on technological consumption and productivity, so costs.Starting from the premise that in furnaces with discontinuous operation the heating is most frequently performed in thermal conditions characterized by constant value of heat flux (q =Jc = ct., corresponding to the 2^nd oder limit conditions), until the heating chamber attain the required equilibrum temperature (T_c = T_t + 20÷40^oC) subsequently passes into T_c = ct (3^rd order limit conditions), it is particularly important to anticipate the value of the temperature drop during the first stage of heating (q=Jc = ct.), to conclude whether the power stage adopted was correct or not, so what technological measures must be taken so that the heating takes place in optimal conditions.The paper presents the conceptual scheme and the analytical model, with the afferent justifications, containing the necessary steps to be followed in order to predict and optimize the appropriate heating conditions from all points of view.