ENGINEERING SUPPORT FOR THE MANUFACTURE OF GEARS OF AVIATION GAS TURBINE ENGINES PROVIDING FOR THE INSTABILITY OF THE PHYSICAL AND MECHANICAL PROPERTIES OF THEIR MATERIALS

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.