INDIRECT EXTRUDER OF METAL

摘要

PURPOSE:To eliminate the ejection of an air pressure from a die hole and forms an extrudate to have a smooth surface in indirect extrusion of a billet by sucking forcibly the air in a cylinder through the evacuating hole of a ram nose block in contact with a container sleeve. CONSTITUTION:A billet 6, inserted into a container sleeve 1a by a ram nose block 4' by the advance of an extruding stem 5 is extruded from the hole of a die 2 by the contact between the block 4' and the sleeve 1a and the advance of the stem 5. The sealing air between the chamber of the sleeve 1a and the billet 6 is forcibly sucked through the evacuating hole 7 of the block 4' by a vacuum pump 10, by which the ejection of the air pressure from the hole of the die 2 is eliminated and the extrudate is formed to have a good surface.