| 摘要 |
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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