Computer modelling of warm powder compaction in rigid dies: Effect of nonuniform heating

Abstract

621.762Computer modelling is used to study warm compaction. Relationships of irreversible porous body flow and the finite element method are used. It is established that in view of nonuniform temperature distribution within a compact there is radial flow of powder. The more heated layer of the material is more intensely compacted than the less heated layer. Nonuniform temperature distribution affects the magnitude of axial and radial pressures. Modelling of compaction of a stepped article of complex shape makes it possible to establish that nonuniform heating may increase radial powder flow that in turn promotes levelling of the density. The results of modelling may be used in order to optimize warm compaction of powder articles by choosing special billet heating schemes.