Patent ID: 6581431
Filing Date: 2003-06-24
Classification: B21C

Abstract:
An extrusion press device for manufacturing an eccentric pipe section from an extrusion block, said extrusion device comprising: a container with a chamber with a longitudinal axis MR which accommodates the extrusion block; an extrusion stem which is introduced into the container chamber and features a dummy block; a mandrel body forming an inner wall of the pipe-section; and a die with an opening with a longitudinal axis MK forming an outer wall of the pipe section, the mandrel body, when in a position for extrusion, is a mandrel arm of longitudinal axis MD with a tip that can be pushed out of the dummy block through the extrusion block one of up to and into an opening of the die, such that the extrusion block material can flow in a seamless manner around the mandrel arm through the die opening, the mandrel arm being arranged eccentric in cross-section with respect to the container chamber and with respect to the die opening, the die opening being eccentric in cross-section with respect to the container chamber, and the longitudinal axis MD of the mandrel arm and the longitudinal axis MR of the container being a distance apart and substantially parallel to the longitudinal axis MK of the die opening, so that the longitudinal axis MK of the die opening in cross-section lies between a pair of straight lines g1 and g2 respectively passing through the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR as well as perpendicular to a line p connecting the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR.