Abstract
The theoretical substantiation of the efficiency of magnetic-pulse attraction method of sheet metal with “direct current transmission” through the object being processed is presented. The analysis of well-known works in this area is carried out, it is shown that the lack of sufficiently complete theoretical studies does not allow effectively performing a given production operation. By solving the boundary-value electrodynamic problem, analytical expressions are obtained for the phase dependences of currents in the experimental system and the excited forces of attraction of the processed object. It is proved by numerical estimates that the low-frequency mode of the ongoing electromagnetic processes is preferable when the fields penetrate intensively through the conducting components of the system under study. It was found that the calculated dependence of the developed forces on the discharge voltage of the capacitive storage allows an approximate estimate of the efficiency of attraction when operating in the accepted range of energy capabilities of the power source. It is shown that the degree of inhomogeneity of the transverse distribution of attractive forces in the region under study does not exceed ~ 20%. A working experimental model has been designed and created, consisting of a tool for magnetic-pulse attraction of sheet metal and a power source - an energy unit. Based on the obtained ratios, the characteristics of the pilot plant and the test modes were calculated. A dosed magnetic-impulse force action has been practically implemented, which makes it possible to control the deformation of sheet metal in the processing zone. Experiments have been carried out to remove dents on samples made of various types of steel under conditions close to the corresponding real production operation. The practical possibilities of the means of magnetic-pulse attraction of certain sections of sheet metals with “direct current transmission” through them have been successfully demonstrated. The effectiveness of the method under consideration is proved when using the indicators of the technological operation, calculated based on theoretically obtained dependences.
Highlights
The attraction methods of defined areas of sheet metals using the energy of pulsed magnetic fields for different types of processing technologies are purchasing more relevant in different industries [1]
Special attention is paid to the development of dent removal and leveling surfaces of sheet metals technologies during the restoration of aircraft hulls and car bodies
That is why of particular interest are on devices allowing for restoration of the damages on the surface from the outside of metallic coating without dissembling of aircraft hull or car body
Summary
The attraction methods of defined areas of sheet metals using the energy of pulsed magnetic fields for different types of processing technologies are purchasing more relevant in different industries [1]. The main disadvantages are the power possibilities finiteness conditioned of induction effects with which the electromagnetic energy essential losses are connected [9] In this regard, a method of “direct passage of current” through the processed metal becomes a very appealing way of the magnetic-pulsed attraction of thinwalled sheet metals. A method of “direct passage of current” through the processed metal becomes a very appealing way of the magnetic-pulsed attraction of thinwalled sheet metals This method can become a basis for the design of an effective tool for external restoration of metal coatings of any vehicles. A common disadvantage of well-known works in this area is the lack sufficiently complete theoretical studies with output to optimal designs of tools with “direct passage of current” allowing the effective implementation of a given production operation, for example, the restoration of metal coatings of vehicle of any purpose (ground-based, aircrafts, aqueous etc.). The aim of the this paper is the theoretical justification of workability of the method of the magneticpulsed attraction of sheet metals with “direct passage of current” through the processing object, experimental researches fulfilling and practical testing of the proposed method in conditions closed to the real production operation
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