| 摘要 |
A wire or rod having an aluminum or aluminum alloy core and a copper or copper alloy casing is produced by hydrostatic extrusion of a compound billet through a die having a conical inlet with an outerpart with a cone angle between 70 DEG and 115 DEG and an inner part with a cone angle between 130 DEG and 150 DEG , the diameter of the inner part being substantially equal to the greatest dimension of the die opening.
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