Patent ID: 6910359
Filing Date: 2005-06-28
Classification: B21D

Abstract:
1. A die apparatus for forming a high strength metal article under elevated temperature and pressure, comprising: at least two opposing die segments together forming a hollow mold chamber for receiving a mold blank between the die segments, the mold chamber having a longitudinal axis and a radial central plane transverse to the longitudinal axis; each die segment having an inner surface having a plurality of spaced, elongate formations extending in a direction non-parallel to the longitudinal axis, each formation having a first side facing the central plane and a second side facing away from the central plane; at least the majority of the formations comprising non-uniform formations in which said first side and said second side are at different angles relative to the central plane, the angle of the second side being greater than the angle of the first side; and the formations including at least one uniform formation located at least approximately at the radial central plane.