Energy Aspects of Technological Inheritance of Aircraft Metal Parts
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RAFT PRODUCTION TECHNOLOGY
Energy Aspects of Technological Inheritance of Aircraft Metal Parts V. I. Goncharenkoa and V. S. Oleshkoa, * a
Moscow Aviation Institute (National Research University), Volokolamskoe sh. 4, Moscow, 125993 Russia *e-mail: [email protected] Received March 2, 2020; revised April 28, 2020; accepted April 28, 2020
Abstract—The paper is devoted to estimation of parameters of technological inheritance based on the energy concept. The features of energy aspects and their technological inheritance are described by the help of processes occurring in parts during the manufacture, operation, and repair. DOI: 10.3103/S1068799820020191 Keywords: aeronautical equipment, metal, technological inheritance, electron work function, contact potential difference, Kelvin probe.
INTRODUCTION The modern aircraft industry uses different types of multi-stage, high technological shaping of metal aircraft parts. For example, the manufacturing technology of compressor blades for an aircraft gas turbine engine includes casting, milling, thermal, chemical and electrochemical processing, surface plastic deformation, grinding, polishing, applying protective coatings, and other technological operations. It is apparent that providing the high quality of aircraft metal parts is an urgent task [1–5]. In manufacture and repair of aircraft metal parts, the technological inheritance occurs, namely, the transfer of properties of a workpiece from previous technological operations to subsequent ones. These operations may be performed both sequentially and simultaneously. Technological inheritance similarly originates in parts during the aircraft operation. The technological heredity is primarily determined by the surface properties of metal parts. Such heredity is manifested in the quality parameters of metal parts that is especially important for subsequent operation of parts in units and assemblies of the aircraft. The technological heredity of the aircraft metal parts is characterized by physical, chemical, deformational, and geometric parameters, which are formed in their surface layer and in the deep layers during all main, intermediate or final technological operations of manufacture and repair and also in the further operation of the aircraft. The physical parameters of the technological heredity of aircraft metal parts are determined by the size of grains and phases, the density of dislocations and vacancies, parameters of the crystal lattice, and the magnitude of surface energy. The chemical parameters of the technological heredity are characterized by the phase composition, their volume fraction, size and shape, and distribution in volume, and also by concentration of chemical elements in the alloy. The parameters of the part deformation are characterized by plastic deformation, the degree of cold hardening and residual stresses. The geometric parameters of technological heredity are characterized by surface roughness, undulation, and the direction of irregularities [6–9]. The value of these parameters of technological h
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