Improving the Wear Resistance of Rotary-Vortex Mill Hammers

The method of increasing the durability of the hammers is proposed, which allows protecting the surface from rapid wear, and thereby increasing the service life of the working bodies. The results of comparative tests of traditional drill hammers, a pilot model of a rotary-vortex mill with a cylindrical shape and a drill hammer, on the working surface of which a solid surfacing and a mesh of wear-resistant material with certain cell sizes are carried out, are presented. As a result of the analytical study of the calculated scheme of force interaction in the hammer cell, an equation is obtained for determining its geometric dimensions, which allow for the pressing of the crushed material. The graphical dependence of the results of the wear value of the hammers made with surfacing of the working surface with wear-resistant material on the operating time in hours, and traditional hammers without surfacing is presented. It was found that the differences in the amount of wear of the hammers made with solid surfacing and with the cells deposited on the working surface are insignificant, this is due to the fact that the crushed material gets stuck in the cells and thus protects the surface of the hammer at the bottom of the cell from intense wear. In this case, the material contacts the area of the cells deposited with the wear-resistant material, which leads to its abrasion, at a rate equal to continuous surfacing.