Determination of the maximum grain width in fractions of grinding powders obtained by screening on test sieves

Abstract

The article outlines the results of the study of the maximum and minimum grain width of black silicon carbide grinding powders with F60 grain size produced by Volzhsky Abrasive Plant, JSC, dispersed by fractions on test sieves. Grinding powders were sieved on a vibration stand in accordance with ISO 9284. Test sieves with the ISO 3310-1 cell size and tolerances were installed in the RO-TAP machine. The grain width was measured using electronic photos of the horizontal projection profile obtained by optical microscopy. Electronic images of grains were processed in specialized software. In each sample, at least 750 grains were measured, selected by quartering. It was found that the grinding powder made of black silicon carbide with a grain size of F60 meets the requirements of GOST R 52381 for grain composition. Visual inspection of the horizontal grain projection profiles showed that the grains are able to pass through the sieve cell, taking into account their possible orientation along the diagonal of the cell. The conditional pass-through size of the grain width in all fractions corresponds to the diagonal of the maximum average cell size of the upper sieve, taking into account the tolerance. The conditional non-passable size of the grain width corresponds to the lower limit of the average size of the cells of the lower sieve, taking into account the tolerance.