Nyzhnyk S. Grinding technology of aviation engine parts, taking into account the increase of the active surface of abrasive grain

The object of study is the process of hard-to-machine materials grinding; the purpose of the study is to ensure an increase of the efficiency of hard-to-machine materials grinding process, by rational selection of the parameters of the process conditions, in order to create favorable conditions for chip formation; research methods - theoretical studies are based on the fundamental principles of mathematics and physics, the theory of grinding, the physical & chemical mechanics of plastic deformation and destruction of metals, the determination of the kinematic and technological parameters of the grinding process was based on an analysis of the kinematics of abrasive tool movement relative to the surface being processed, experimental studies were performed in laboratory conditions using modern research methods and measurement equipment; results - recommendations were developed, the use of which allows ensuring the performance of quality indicators when grinding hard-to-machine materials; novelty - the main characteristic criterion φ is introduced - the angle of grain orientation, which allows determining rational processing parameters for various types of grinding; an expression has been established for calculating the active surface of the cutting grain, which makes it possible to justify a universal approach to the calculation of cutting forces, temperature and tool life for various grinding schemes; the conceptual model of an abrasive grain has been further developed, which allows for a specific brand of abrasive tool to determine not only the geometry of the equivalent grain but also its orientation; degree of implementation - the results were introduced at JSC «VAZ», Volchansk, in the educational process of the department of technology of aircraft engines manufacturing of the National Aerospace University «Kharkiv Aviation Institute»; the field of application is the processing of hard-to-machine materials by grinding in aviation and general engineering.