Kalinichenko M. High-performance creep feed grinding of aircraft engine parts from hard-to-machine materials

Object of research – the process of creep-feed grinding of aircraft engine parts from hard-to-process materials; the purpose of the study – to ensure the quality parameters of the surfaces of aircraft engine (AE) parts by creep-feed grinding; research methods - the use of fundamental provisions of the theory of grinding, as well as the theory of heat transfer using modern methods of experimental research and measuring instruments; results - the algorithm of calculation of rational technological parameters of grinding process with use of grinding tools with intermittent structure of a working surface and for tools with complicated kinematics is offered and recommendations on development of technology of processing of blades, segments of nozzle devices, sectors of input directing devices and several flat samples are given, which produced from 4Х5МФ1С, ВТ6, ХН53КВМТЮБ and ШХ15 by creep-feed planetary grinding, taking into account the processing parameters: grinding depth of cut, longitudinal feed, head rotation speed, wheel characteristics, wearing modes; novelty - for the first time for the physical model of high-performance planetary creep feed grinding the mathematical model of process of machining of details taking into account distribution of temperature sources on a contact surface is developed; the mathematical model allows determining at any time the temperature of the workpiece and the distribution of temperature sources, which are cutting or deforming grains, taking into account the design and kinematic features of circles with a continuous, intermittent surface, as well as for planetary grinding head; the introduction of characteristic criterions into the mathematical model of calculation of temperature in the zone of contact of abrasive grain with the machined surface is substantiated: relative speed of grinding and similarity criterion, similar to Peclet criterion; for the first time the method of updating the elements of the temperature matrix of the mathematical model is proposed, which allows at any time to contact the wheel with the part to describe the process of removing material from the surface of the part taking into account the planetary motion of the tool and translational movement of the part; receive information about the presence / absence of the temperature element of the part; calculate the value of the length of the contact arc in any position of the wheel relative to the part, as well as determine the points of application of temperature at a given law of grain distribution on the surface of the grinding wheel; degree of implementation - the results are implemented in the educational process of the Department of Aircraft Engine Production Technologies of the National Aerospace University named after M. E. Zhukovsky "KhAI", in the joint-stock company "Motor Sich"; field of application - metal processing by grinding in aviation and general mechanical engineering.