Effect of shears between particles of mouldable iron powder on strength of manufactured parts

Abstract

With a view to increase the strength of the products, two schemes have been developed for forming iron powders. Schemes involve intensive shifts between iron particles. One of the schemes is designed for forming billets, which after their sintering are deformed in dies without heating. The second of the schemes is designed for manufacturing directly at the stage of compacting the powder of conical thin-walled bushings of variable cross-section. As a result of the shifts between the particles, the densities of the molded billets were achieved, which allowed them to be tested for shear strength up to the sintering stage. The dependences between the density in the sections of the molded billet, its hardness and strength after sintering are experimentally determined. The dependence of the shear stress on the work piece on its molding scheme, the effect of magnetic pulse processing (MPP), and the powder composition is studied and described by the regression equation. The dependence of strength distribution in manufactured thin-walled bushings on the place of its measurement, the impact of MPP and powder composition is described similarly.