A new die profile with high process efficiency

A new technique is used to design die profiles which yield high process efficiency during axi-symmetric extrusion and wire drawing. These profiles have a convex shape. The upper bound of the average ram pressure is calculated for the practical range of reductions and optimal die lengths. For m=0,1 where m is the constant friction factor, and up to 55 per cent reduction the reduced extrusion pressure is the same for this convex die and the optimal length cosine die. Above 55 per cent reduction the pressure is slightly higher than that for the cosine die. Up to a reduction of 55 per cent the optimal lengths for this one are slightly shorter than that of the cosine die, while those values for higher reductions are a little higher for this die. The efficiency of the proposed die exceeds those of conventional conical dies.