ОСОБЕННОСТИ ПРОЦЕССА ОБРАБОТКИ СТАТИЧЕСКИ УПЛОТНЕННЫМИ АБРАЗИВНЫМИ СРЕДАМИ ДЕТАЛЕЙ ТИПА ТЕЛ ВРАЩЕНИЯ

Abstract

The study objective is to find out an analytical dependence that correlates the operating parameters and the conditions of the finishing abrasive treatment with the roughness of the working surfaces of the parts, taking into account the shape factor of the manufactured parts.
 The tasks to which the paper is devoted include theoretical and experimental studies of the effect of the treated surface roughness on the technological modes and conditions of surface treatment of complex-profile parts in the medium of statically compacted loose abrasive, as well as in the development of a methodology for determining rational modes and conditions taking into account the shape factor of the machined parts and determining the achievable range of surface roughness.
 Research methods: theoretical studies are conducted on the basis of the main provisions of mechanical engineering technology, grinding theory, theoretical mechanics, theory of elasticity and plasticity. Experimental studies are carried out according to standard methods in production and laboratory conditions using certified instrumentation. The data obtained are processed using computer technology and presented in the form of empirical dependencies, convenient for practical use.
 The novelty of the work is in finding mathematical dependencies for calculating the pressure of a statically compacted abrasive layer on the surface of the parts being machined, taking into account the shape factor.
 Conclusions: Based on the calculated theoretical dependencies and experimental studies, it is shown that the work of micro-cutting with the microrelief of abrasive grains is approximately 1.5...2 times higher than the work of micro-cutting with the tops of abrasive grains of the grinding wheel. This allows to conclude that the machining of parts with a statically compacted loose abrasive, compared with grinding with a conventional grinding wheel, is a less energy-consuming process of removing material from the surfaces of the machined parts.
 The paper presents peculiarities of finishing parts with statically compacted abrasive media. The ratio of friction work and micro-cutting of the machining is shown. The nature of the contact interaction of abrasive grains with the treated surface is considered for the first time, taking into account the shape factor, and the rational range of final roughness is defined.
 The role of cutting elements of particles affecting the quality and productivity of machining is determined.