for a constant reduction, a smaller die half-angle. This results,however, in a longer surface over which friction must be overcome.
Conversely, a larger die angle reduces the fric- tional components but leads to increased inho- mogeneity; therefore, as in wiredrawing, an op- timal die angle is found, the value of which increases with increasing extrusion ratio and friction (Fig. 9) (Ref 9).
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