The Influences of the Die Half Angle of Taper Die During Cold Extrusion Process

Abstract

In this work, the effective strain distributions of billet extruded with taper dies which have different die half angle were investigated. The extrusion ratio for all experiments was set as two. The experimental works were done using cold-work plane strain extrusion apparatus. The experiments were done at room temperature around 28–32 °C. Three types of taper die with three different die half angles, which are 0°, 30°, and 60° were prepared. Paraffinic mineral oil with low viscosity was used as test lubricant. The material of billet was annealed with pure A1100 aluminium. The experimental results were focused on the extrusion load, tool and workpiece surface roughness, and plastic deformation of billet. The velocity and the effective strain of billet were calculated using a visioplasticity method. From the results, we found that the die shape helps to reduce the forming load, which could contribute in minimizing the energy.