Effects of flow guide configuration on material flow characteristics in extrusion of C-Channel product - die design aided by physical simulation system Ⅱ

摘要

A series of extrusion experiments of a C-channel product were carried out using a fiat die and dies with flow guides of various configurations and dimensions. A cylindrical plasticine billet was employed as a model material of aluminum alloy in hot extrusion in the experiments, and the three-dimensional plastic flow conditions during the steady state extrusion process were measured and analyzed by applying the visioplasticity method. Three-dimensional dead zone configurations were also calculated from the steady state flow line patterns and graphically displayed in the present investigation. We could confirm that the distribution of flow out velocity on the cross-sectional plane of a product becomes almost uniform at the die exit section in steady state extrusion by using a die with a flow guide of optimum configuration and dimensions. The experimental and analytical data provide useful information for optimum design of the die with a flow guide.