Strelnikova V. Improving the efficiency of electromagnetic technologies of automobile transport repair

This thesis is devoted to further development of progressive technologies of automobile transport repair, from base elements of aggregates to body panels, using the energy of electromagnetic fields increasing the effect intensiveness on metal region caused by adding into repair-tool construction ferromagnetic cores, and also implementing of magnetic-pulsed attraction with “direct current passage” through the processing object. In the presented dissertation has been conducted analysis of induction heating technology and tools for its realization which allows indicating the real opportunity for increasing magnitude of induced currents and velocity of processing operation at the same level of energy by additional ferromagnetic cores in tools construction. Physically, such solution helps to decrease the dissipation of electromagnetic fields and concentrate them in local direction on processing metal region. The analytical conclusion of the tool design with ferromagnetic core effectiveness, determination of the proportionality factor between the maximum densities of excitation and induced currents, which value defines the energy transformation in the investigating system “inductor – processing metal”, also corresponding experimental researches are testify to achievement of the set purpose of the dissertation thesis. Analysis of magnetic-pulse methods of force, based on the attraction of specified areas of sheet metals, showed the demand for electromagnetic technologies for the restoration of vehicles and the need for their further development through the introduction of new tool designs. Analysis of the effectiveness of non-contact magnetic pulse attraction tools based on the manifestation of magnetic properties of processed metals or on the force interaction of induced currents, showed the need to create new tools where attraction can be done by "direct current passage" through a given section of sheet metal.