Modern Extrusion Die Hardening and Nitriding
Tom Guler, Thermovac Pty. Ltd.
Jeff Pritchard, VAC AERO International Inc.
Track: DIE DESIGN AND TECHNOLOGY - Surface Treatments and Materials
ABSTRACT --- Due to the increasing complexity of extruded shapes, the heat-treating
operations used in the manufacture of extrusion dies have undergone considerable
evolution. Advances in vacuum heat-treating techniques now permit the hardening of
large dies, but not without the risk of distortion and cracking when thick sections and
complex shapes are involved. Case hardening by gas nitriding has long been used to
prolong the service life of extrusion dies, but this process also has been refined to
achieve optimum material properties. This paper describes a novel approach to the
vacuum hardening of large extrusion dies using gas quenching in a specially-designed
furnace. It also presents a new advance in the control of the gas nitriding process.
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