Extrusion process in which a piston with a mandrel, presses an ingot through a die and creates a hollow component. Beskrivning The process The working material consists of a preheated ingot [1] placed in a pressure chamber [2]. A plunger [3] with the mandrel pressed against the ingot with an applied pressing force which forces the ingot out of a die [4] and around the mandrel. The ingot then assumes the same form as the die and mandrels sectional area and is pushed out as a hollow axially symmetric profile [5]. The force required to press the ingot through the container is high because of the great friction between the ingot and the container wall. As the ingot is cut down and becomes thinner, the force, ate the rear end of the ingot cannot push it through the die with desired results. Because of this, the rear end cannot usually be used. Direct hollow extrusion Process films
