Document Type and Number:
Japanese Patent JPH0428444
Kind Code:
B2
Abstract:
An extrusion die has a die aperture which is negatively tapered essentially throughout its length at an angle of at least 1 DEG such that any friction stress between the die lands and metal flowing through them is negligible, the length of the lands being not more than 2 mm so that fouling does not significantly take place thereon during extrusion. Faster extrusion speeds can be achieved, particularly when extruding aluminium alloy having a shear strength of from 1.2 to 4.0 Kg/mm2 at 500 DEG C.
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Inventors:
JIINNPIEERU ARUDOOIN
Application Number:
JP28015785A
Publication Date:
May 14, 1992
Filing Date:
December 12, 1985
Export Citation:
Assignee:
ALCAN INT LTD
International Classes:
B21C25/02
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