The key place in the production of gas turbine engines, including gears, both aviation and marine, also power generation turbines, is given to sectional steels. Consequently, not just a physical nature of gear wheels manufacture plays an im-portant part, but formal characterization and the supply of physical and mechanical properties of materials are in the prior-ity, taking into account the reliability of the materials. The problem of technological support for the manufacture of gears for gas turbine engines is viewed with simultaneous analysis of the part material, its manufacturing technology and investi-gated inseparably from each other. The interrelation of working surfaces quality and technological and strength character-istics with respect to operational properties is developed. The instability of the mechanical properties of the structural ma-terial is investigated and their formation is justified on the basis of technological heredity in accordance with the techno-logical process of manufacturing a part to its material and purpose. The instability of physical and mechanical properties is clearly presented on the example of one steel grade, but with different methods of obtaining the workpiece and the material in as-received condition. The influence of heat treatment on the stabilization of the physical and mechanical properties of the material, taking into account the inheritance of properties, is studied. A model of the contact interaction of gears has been developed taking into account external and internal influences, both during preparation and under operation (materi-al properties, engagement forces, temperature field, etc.). The cumulative model, focused on the reaction of the structural material in machining and interaction in work, summarizes a functional use, physical and mechanical properties and fea-tures of behavior in operating conditions. The control of the operational properties of gears is presented in an inseparable connection with technology and their materials such as structural state and physical and mechanical properties.
The paper reports theoretical dependences defining a correlation of technological processing conditions (cutting modes, tool tip geometry, properties of worked and tool materials), quality parameters of a surface layer (surface roughness, degree and depth of cold work, residual stresses) and performance properties of machinery (fatigue resistance, wear-resistance, contact rigidity, press-fit connection strength) which can be used in a team-work of a designer and a technologist at simultaneous technological pre-production.
The improved basic concepts, definitions and regulations of engineering technique connected with its scientific development are stated. The formulations of these concepts and their interpretation are shown. Specific examples of the use of the mentioned technological concepts and definitions are presented.
Theoretical or theoretical-experimental methods are widely used when studying various techniques for processing materials, cutting among them. The physical and mechanical properties of the materials being processed are to be taken into account along with the process parameters (mode, geometric parameters of the machining tool, etc.). The resistance of the material to plastic shear present in the calculated dependences for determination of the force and temperature in the cutting zone and the temperature in the surface layer of the workpiece, as well as for determination of the quality parameters of the surface layer of the part (the residual stresses, degree and depth of work hardening, roughness, and others) and the accuracy of processing is used in all the aforementioned methods in addition to the ultimate tensile strength and the modulus of elasticity of the processed material. Previously, when determining the numerical value of the resistance of the processed material to plastic shear, the latter was considered as a function of the tensile strength of the processed material. However, an increased temperature observed in the cutting area which depends on the combination of the processed and tool materials, the mode of processing, and on the geometry of the cutting part of the tool was not taken into account. The value of the effective cutting force was also ignored though this value is determined by the same parameters which determine the temperature in the cutting zone. The mechanical characteristics of the processed material are known to depend on the temperature. In this regard, the resistance of the processed material to plastic shear was assessed at a certain temperature determined by the technological conditions of processing. The goal of the study is to prove the necessity of determining the resistance of the processed material to plastic shear to be used in theoretical determination of cutting forces, temperature in the cutting zone, and the quality parameters of the surface layer of the part. The dependence is given to determine the value of the resistance of the processed material to plastic shear under optimal processing conditions that ensure the minimum wear of the cutting tool taking into account the parameters of the cutting process and the geometry of the cutting part of the tool. Processing conditions that determine the temperature and force in the cutting zone are taken into account by chip shrinkage in the formula for determining the value of the resistance of the processed material to plastic shear. The use of the proposed technique can improve the accuracy of calculations of the quality parameters of the material of the surface layer of the part and the accuracy of processing.
Обеспечение качества изделий машиностроения и авиакосмической техники при технологической подготовке производстваОбоснована необходимость и целесообразность использования при технологической подготовке производства параллельной инженерной разработки конструкции и технологии изготовления изделия. Приведены направления параллельной инженерной разработки. Представлены расчетные зависимости для прогнозирования эксплуатационных свойств деталей авиационных двигателей, необходимые при совместной работе конструктора и технолога при параллельной конструкторско-технологической подготовке производства.Ключевые слова: технологическая подготовка производства; параллельная инженерная подготовка; эксплуатационные свойства детали; поверхностный слой; точность обработки.The necessity and purposefulness in the use of parallel engineering design development and manufacturing technology of products in the course of technological pre-production. There are shown directions for parallel engineering development. The calculated dependences for forecasting the operation properties of aircraft engine parts are presented which are necessary at the joint work of a designer and technologist in the course of parallel design-technological pre-production.
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