Experimental Modeling of Contact Interaction of Abrasive Tool with Machined Material for Rational Choice of Lubricating Medium

A complex approach for evaluating the functional characteristics of coolants for grinding hard-to-machine materials is proposed, which is realized by means of experimental modeling of damage to the machined material and a single roughness of the grinding wheel during simulated cutting with gripping. Selection of lubricating medium for abrasive machining is carried out on the basis of establishment of critical processes in the cutting zone with the help of tribological parameters and accompanying signals of acoustic emission (AE) obtained as a result of tests on the reciprocating scheme ASTM G133 of two pairs of friction: “abrasive material—metal” and “metal—metal”. The study was carried out for environmentally oriented lubricating media using canola oil: in initial state; mixture with Al₂O₃ nanoparticles; emulsion (20 % canola oil + 80 % water). It is established that in conditions of contact “abrasive material—metal” application of emulsion provides reduction of adhesive adhesion of the contacted surfaces, the minimum coefficient of friction in tests, and the lowest level of wear of the contacted pair. Considering “metal—metal” contact interaction, the use of canola oil composition with Al₂O₃ nanoparticles will be the most effective here, due to high wear resistance and low plastic deformation in contact. At tribological tests of the investigated friction pairs, it is established that the maximum influence on the AE signal value is exerted by the level of adhesion processes at the contact interaction “abrasive—metal”. Dynamics and character of wear of friction pair “metal—metal” has its own features, which is reflected in the behavior of the accompanying AE signal, the fact that the value of the integral AE estimation does not directly correlate with the results of wear of the contact pair and strongly depends on the composition of the lubricating medium.

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