Авіаційно-космічна техніка та технологія (Oct 2023)
Analysis of the development of the thermopulse method for removing burrs
Abstract
The subject of study in this article is theoretical and experimental studies of the process of removing burrs in the details obtained by metalworking using the thermopulse method of combustion of detonating gas mixtures. The purpose of this article is to substantiate the use of the thermopulse method for finishing parts, which was developed at Kharkiv Aviation Institute in the early 70s of the 20th century for the flexible automation of cleaning the surfaces and edges of parts of hydraulic and fuel units of aviation and rocket-space equipment from burrs and technological contamination. The task was to determine the features of the thermal pulse method, the parameters of the technological process from the viewpoint of its application for processing the edges of parts with complex internal and external surfaces, and to reveal its potential for use in precision engineering. The research methods used are the modeling of processes using the finite element method and an experimental method for checking the adequacy of the proposed numerical models. The following results were obtained: processing of parts made of materials with different thermal conductivities, cleaning of rubber products, and rounding of the edges of threaded holes of aluminum alloy parts by melting. The scientific and practical novelty of the obtained results is as follows: the technological possibilities of thermopulse processing, justified control parameters, and optimization of processing modes are given; to consider the processes of heating the elements of the part and the combustion of detonating mixtures in the working chamber of the equipment; obtained regularities of changes in the temperature fields of liquids and structural elements of parts during pulsed, constant, and mixed heating, which make it possible to form regimes of thermopulse processing of parts considering their structural features in several thermophysical properties of materials; developed processes of thermal pulse removal of burrs, microparticles, and dimensional rounding of edges using the results of modeling and experimental refinement on T-15 installations.
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