A round billet made of 70-30 brass is extruded at a temperature of 675°C. The billet diameter is 125 mm, and the diameter of the extrusion is 50 mm. Calculate the extrusion force required.

A round billet made of 70-30 brass is extruded at a temperature of 675°C. The billet diameter is 125 mm, and the diameter of the extrusion is 50 mm. Calculate the extrusion force required. Correct Answer 5.6 MN

The extrusion force is calculated using Eq. F = A0k ln(A0/Af) in which the extrusion constant, k, is obtained. For 70-30 brass, k = 250 MPa at the given extrusion temperature. Thus, F = (3.14(125)2)/4 x (250) ln = 4 = 5.6 MN.
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