Direct extrusion of rate-sensitive materials through conical dies

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Abstract
A theoretical analysis to estimate the force required to extrude a rate-sensitive material is presented. The material is considered to behave according to the constitutive equation : σe = σ 0 sin h-1(εe/ε0) and die friction is assumed to be of the Coulomb type. Extrusion experiments performed on superplastic Pb-Sn eutectic alloys agree well with the theoretical predictions over a wide range of extrusion ratios and ram speeds. The present theoretical method which accounts for rate sensitivity is compared with other methods available in the literature. It is concluded that consideration of rate sensitivity of the extruded material represents an important factor in predicting the extrusion pressure correctly

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