Technological features of the combined foundry-induction method of producing three-layer castings

The technological features of developed casting-induction method for obtaining threelayer «cast iron-steel-cast iron» castings were studied. The specified method consists in the use of induction heating of a steel billet with a high-frequency electromagnetic field in the casting process for obtaining three-layer products. The paper represents mathematical modeling results of temperature fields distribution under the action of electromagnetic fields on a steel workpiece. The main regularities of steel billet temperature changes depending from the current level and heating time have been established. As a result of simulation modeling, the technological parameters of the steel workpiece heating and cooling process were determined, as well as the pouring of the melt during the production of three-layer castings. Obtained dependences between temperature of the poured melt and temperature of the workpiece are necessary to ensure a high-quality connection between the steel inner part and working layer made of cast iron. The results of the experimental testing confirmed the adequacy of the mathematical modeling of the thermal state of the workpiece, as well as the effectiveness of using the developed combined casting-induction method for obtaining three-layer castings. Keywords: induction casting method, induction heating, simulation modeling, three-layer casting, electromagnetic field, melt.