Abstract
The Objective of this study is to expand the double cup extrusion test. used for evaluating lubrication in cold forging, to determine the friction factor m and study factors affecting the sensitivity of this test at the same time. An FEM analysis was used to predict metal flow and forming load for different reductions in area, using a fixed billet geometry. Based on this study a procedure is suggested to estimate friction at large effective strains and interface pressures that occur in cold and warm forging, and factors affecting the results of this test are identified.
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