Andilahay A. The scientific fundamentals for effective finishing abrasive machining with submerged jets

Object - processes abrading submerged jets small precision parts low stiffness and complex configuration. The purpose - to improve the quality, performance and stability of the finishing of small precision parts and low rigidity of complex configuration based on the development of a submerged jet abrading and definition of rational technological and structural parameters settings for its implementation. Methods - the fundamental assumptions of engineering technology, the theory of cutting materials, strength of materials, theory of vibrations, physics, mathematical analysis, probability theory and mathematical modeling. Experimental studies were carried out using modern electron microscope-interferometer profilograf-profiler, hardness PMT-3 microscope MII-4, an electronic tachometer, optical dividing head, horizontal and optimeter photorecording. Novelty - estimated technological regularities of formation of quality parameters in abrasive blasting with the position of the theory of cutting of materials subject to the conditions of the transition from the process of plastic deformation of a material in the process of cutting the abrasive grains. Theoretically, based on the criterion lowest energy intensity treatment justified technological opportunities to improve quality and productivity abrading edges blanks, descaling and microroughness reduction in the treated surfaces. A mathematical model for determining the surface roughness and abrasive machining performance submerged jets based on the dynamics of motion of abrasive grains in the material being processed. Theoretically substantiated the possibility of improving the quality and performance of a submerged jet abrading parts made of ductile and brittle materials by providing acute and obtuse angles entrance of abrasive grains in the material being processed . Theoretically and experimentally proved the effectiveness of the profiled supersonic Laval nozzle that enhances the quality and processing performance by achieving a double effect of treatment: increasing the flow rate and the number of abrasive grains, which are injected into the flooded stream of compressed air . Developed engineering methods for determining the optimal design and technological parameters settings for abrasive machining of a submerged jet of compressed air. Results - technology and equipment introduced into JSC "Medprom" and OOO "Azovelektromehanika" (Mariupol), GP Kharkov machine-building plant "FED", JSC "Azov Machine Building Plant" (Berdyansk) Ltd. Technical Center "VariUs" (g. Dnepropetrovsk) with overall economic effect 305 135 hryvnia per year. Developed technology and equipment used in the educational process. Scope of Use - instrumentation, opto-mechanical production, radio- and electrical industry.