Rud V. Physical and mechanical aspects of powder pressure part forming technology under complex loading schemes and vibration

Objective of the work is solving of the important scientific-applied problem of powder metallurgy on elaboration new and perfection of existent technologies powder detail production. The details have improved mechanical and functional properties. It achieves on the basis of experimental conception of irreversible deformation of powder materials at complex loading paths and use of computer-simulation models for optimization of compression processes under conditions of the axial loading, radial hydrostatical and vibration pressing. The Object is a process of cold compaction and vibration pressing of powder materials. Methods. Experimental works from research of influencing of schemes and history of deforming paths mechanical properties of porous bodies are had been performed with high-pressure installation of original construction with independent adjustment and registration of all power and deformation parameters. Mathematical and statistical treatment experiment results are performed with the probability of 0.95. . The form of yield surface and it transformation under different loading paths had been established. For the sintered porous metals the yield surface is an ellipsoid displaced toward negative stresses on hydrostatical axes. For powders surface of loading paths had been described under the Cam - Clay model with displaced surface centre towards negative mean stress. Computer modeling methods of filing up of powder in a form of different shapes had been elaborated. The equipment and method software of the vibration forming is offered with the use of vibrations units with the by a volume method of excitation of vibrations and working parts on loaded shells. It is set, that the method of vibration pressing with the spatial form of matrix is especially effective. The developed technology of utilization of grinder wastes of bearing production, which differs from classic schemes because that metallic powder ШX15 after magnetic separation is billet to additional rolling, cracking and renewable annealing. A novelty and practical orientation of the work proved by patents and research results using in production (ЛуАЗ, ЛПЗ).