If the area under the indirect extrusion curve of Figure 18-25 is proportional to the power required

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If the area under the indirect extrusion curve of Figure 18-25 is proportional to the power required to extrude a product without billet-chamber frictional resistance, how could the relative regions of the direct extrusion curve be used to determine a crude measure of the mechanical "efficiency" of direct extrusion?
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Materials and process in manufacturing

ISBN: 978-0471656531

9th edition

Authors: E. Paul DeGarmo, J T. Black, Ronald A. Kohser

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