Dreshpak N. Induction heating modes of machine parts with a detachable connection of cylindrical surfaces

The thesis is devoted to solve an urgent scientific task to establish the regularities of interconnected electromagnetic, thermal and deformation processes in the system of induction heating of details connections, considering changes in the heating process of a contact thermal conductivity, and determine appropriate heating mode parameters that provide with an efficient dismantling operation and improve technical and economic factors (weight, size, cost) of induction heating systems. At the first time the main requirements for the induction heating process and the conditions of their implementation are substantiated. The dependence for calculating the required temperature difference between the surface of a plug and a shaft while an interference liquidation and connection dismantling is received. The methodology to form an one-dimensional magnetic field is created and a device for its realization is proposed. Expediency and the order of the contact thermal conductivity identification are substantiated. Analytical relations for the value of the specific surface heating power calculation are got. The estimated value of the specific surface power allows to realize dismantling in a transition heating mode that provide with an efficient technological operation. While choosing the current frequency of an induction installation it is proposed to stick to the condition of limitation of electromagnetic field penetration into the shaft. A mathematical model to analyze the influence of electromagnetic field parameters on the characteristics of a thermal process is developed. The way of induction heating operation that is based on a current pulse repetition changing is received. Experimental investigations that confirm the reliability of obtained scientific results are conducted.