Palaziuk I. Method for operating conditions assignment of thermal pulse deburring of GTE parts made from heat-resistant alloys by the edge qualimetric parameters

The object of research – process of thermal-pulse deburring by detonating gaseous mixtures; the purpose of research – development of the method for operating conditions assignment of thermal pulse deburring of GTE parts made from heat-resistant alloys by the edge qualimetric parameters using modern integrated CAD/CAE-systems; research methods – methods of mathematical modeling, numerical methods for solving the problems of multicomponent flow of gas environments, taking into account the processes of detonation combustion and heat transfer, experimental investigations of the influence of thermal-pulse deburring on the characteristics of the tendency of heat-resistant alloys to high temperature gas corrosion; the results of the study – the method of technological modes assignment of thermal pulse deburring according to the qualimetric edge index by using of modern CAD/CAE-systems has been proposed; computer programs for simulation of the heat exchange processes during detonating combustion of fuel mixtures in a closed chamber, which in the future can be used in the design of thermal pulse equipment, have been developed; novelty – the method of an equivalent chamber for calculation of the shock waves damping time and the values of specific heat fluxes during thermal pulse deburring has been improved; in contrast to the existing approaches, it is proposed to determine these parameters by means of numerical calculation of the heat exchange of combustion products with a simple form part located in the chamber, volume of which is identical to volume of the workpiece to be processed; an essential advantage of this method is the ability to determine in one calculation the time of shock waves damping in the working chamber, and the values of the heat fluxes acting on the workpiece to be processed as well; the model for calculation of the temperature distribution on a part edge during thermal pulse deburring has been improved; unlike the previously used models, it allows to take into account the gradual change of burr geometry during melting; to obtain data about qualimetric edge index, it is substantiated that it necessary to consider temperature dependences of the thermophysical characteristics of the material as well as geometry of burrs and edges; for the first time the absence of a negative effect of the thermal pulse deburring by detonating gaseous mixtures on the tendency of the heat-resistant alloy GS26-VI to high-temperature gas corrosion was confirmed; for comparison the laser deburring method, which is widely used for treatment of gas turbine engine parts, in particular turbine blades, was chosen; the degree of implementation – the results were introduced at the State Enterprise KhMZ «FED»; the scientific and technical base, which is used in the course of scientific research and training of specialists at the National Aerospace University named after M. E. Zhukovsky «KhAI»; field of application – aviation industry.