Hi-Tech Welding Services, Inc.

Stephen Michael Dowell

John Charles Monsees

Donald Owen Nelepovitz

Leo Lawrence Magee

A die apparatus for forming a high strength metal article under elevated temperature and pressure has 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 radial central plane transverse to the longitudinal axis. Each die segment has a plurality of ribs or indents, each rib or indent having a first side facing the central plane and a second side facing away from the central plane. At least the majority of the ribs or indents are of non-uniform shape and have a first and second side at a different angle relative to the central plane, the angle of the second side being greater than the angle of the first side such that the second side is directed generally towards the center of the mold cavity. With this arrangement, when a metal article is molded in the cavity, it will tend to shrink towards the center of the cavity as it cools, in a direction generally along the second sides of the ribs or indents, reducing force acting directly into the ribs or indents.

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Lakeside, CA, United States of America

Stephen Michael Dowell