Actual Problems in Machine Building 2018 Vol. 5 No. 3-4

Actual Problems in Machine Building. Vol. 5. N 3-4. 2018 Innovative Technologies in Mechanical Engineering ____________________________________________________________________ 50 FORMATION OF A GREASY LAYER IN THE GRINDING OF STEEL 45 Yanpolskyi V.V., Ph.D. (Engineering), Associate Professor, e-mail: yanpolskiy@corp.nstu.ru Belyy A.V., Master of Engineering sciences, e-mail: sanja-1994@mail.ru Novosibirsk State Technical University, 20 Prospekt K. Markca, Novosibirsk, 630073, Russian Federation Abstract The study of quantitative and qualitative characteristics of a greasy layer after grinding of steel 45 in an unquenched state is carried out. A detailed description is given of the technique for preparing a cross-section of an abrasive wheel and the features of preparing a microsection for an abrasive wheel to assess the quantitative and qualitative characteristics of a greasy layer. Based on the analysis of the obtained structure, it is shown that the salted layer has a fibrous structure with the presence of shells. It is established that the microhardness (HV) value of the greasy layer is 4500 MPa. A comparative analysis of the value of the microhardness of the greasy layer and steel 45 in the non-quenched state is carried out. The value of the microhardness of the greasy layer is much higher than the initial value of the microhardness of steel 45 in the non-hardened state. This fact may indicate the effect of high local temperatures and deformation effects. Keywords greasy layer, abrasive wheel, grinding, microhardness, steel 45.