ESTIMATION OF RESIDUAL POROSITY IN COMPACT PRODUCTS OBTAINED IN THE TECHNOLOGICAL PROCESS OF EXTRUSION OF POWDER METALLIC MATERIALS

Abstract

The influence of technological parameters, i.e. the draw ratio (λ), the angle of the matrix (α) on the residual porosity of the product is investigated. To characterize different stages of the extrusion cycle (extrusion), the dependence of the average pressure (P*) on the displacement of the punch,  (ΔL) is constructed. An analytical equation has been identified that estimates the change in porosity during hot extrusion. It is established that the presented equations allow to calculate the final porosity after extrusion by the initial porosity (θ₀) and various parameters of the process, and also obtain a non-porous product.