On the issue of wearing mechanism of abrasive wheels during rails grinding

Issues related to the study and theoretical description of the mechanism of wear of abrasive grains on a grinding tool used in the machining of railway rails are reviewed in the article. Abrasive wheels often do not cope with the task of removing surface defects that partially remain on the treated surface. In this case, the rail-grinding train is forced to make several passes (3 …4 passes). This leads to a decrease in the productivity of the rail grinding process. It is noted that it is possible to achieve an increase in the productivity of grinding the rails by controlling the pressing force of the wheels to the machined surface of the rail head. It is shown that the role of the destruction of the wheel grains in the grinding of the working profile, and, consequently, the profile of the rail head remains undisclosed. These unresolved issues of the mechanisms of abrasive wheels wearing during rails grinding require their own special studies. The process of formation of the individual grain wearing surface during grinding is described. It is noted that the mechanism of wearing of abrasive wheels is predictable. In this work, theoretical studies are carried out and the process of wearing of the abrasive grain is idealized, as well as mathematical simulation of the process of wearing of an individual particle is carried out on the basis of the analysis. The size of the areas of grain wearing and the intensity of its growth is the most important factor that characterizes the wearing of the tool caused by the destruction and loss of grains from the bond.