Some studies on stresses and strains of aluminium alloy during extrusion-forging at room temperature

The present investigation has been undertaken to evaluate some aspects on extrusion-forging during cold upsetting using a suitable die using aluminium alloy (H9-6063) solid cylinders subjected to different geometrical conditions such as approaching angles namely, 35°, 45°, 50° and 60°, with two different initial protrusion heights namely 8 mm and 10 mm. During the experiments, three geometries such as barreled cylinder, truncated cone part and protruded part or extruded parts were observed. The calculations were made on the assumption that the volume constancy principle holds on and the curvatures of the barrel were in the form of a circular arc. Further, it is established that the protrusion height increases with the increase in the approaching angle for a given extrusion load. The relationship was also established between the various bulge parameters namely the hoop stress, the hydrostatic stress and the stress ratio parameters. In this work an attempt has been made to establish a relationship between the approaching angle and protrusion height and to establish a relationship among various height strains and stress ratio parameters.