REDUCING THE THERMAL FACTOR IN FLAT ABRASIVE GRINDING
Urgency of the research. Grinding is accompanied by the release of heat, under the influence of which, burns and residual tensile stresses form in the surface layer of the workpiece. Grinding defects are sources of destruction of the part. Target setting. The use of circles with a discontinuous working surface makes it possible to lower the temperature in the cutting zone. The abrasive industry does not produce intermittent circles on the ceramic binder due to imperfect manufacturing technology. Actual scientific researches and issues analysis. The wide application of intermittent circles in machine-building enterprises is hampered by the inconsistency of the methods for calculating the lengths of the depressions and cutting protrusions. Uninvestigated parts of general matters defining. The problem of reducing the heat stress of the grinding process can be solved on the basis of further study of the thermophysical and dynamic components of the machining process by discontinuous circles. The research objective. The purpose of scientific research is to identify ways to reduce the heat stress of the grinding process. The statement of basic materials. The process of heat increase at a fixed point of the treated surface is simulated as it is repeatedly influenced by thermal energy, which is released during metal cuts by individual projections of a discontinuous circle. Investigations have been carried out to reveal the influence of the dimensions and number of geometric elements of the working surface of a discontinuous circle on the parametric stability of the elastic system of the machine tool. Conclusions. Recommendations are developed for calculating the lengths of protrusions and troughs of a discontinuous circle, taking into account thermal and dynamic factors. Data have been obtained that confirmed the hypothesis that intermittent circles with a large number of slits on the working surface and highly porous circles can reduce the temperature in the cutting zone with the same effect.