On the Determination of the Coefficient of Friction and the Friction Factor by the Strip-Tension Friction Test

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The strip tension friction test was used to investigate friction conditions in the forming of thin aluminum sheet without lubrication. In this test. which simulates metal flow around the leading face of a punch. the level of friction is judged based on tool-workpiece interaction when a metal strip, bent in the shape of a U. is stretched plastically around two fixed cylindrical friction pins. Friction is described by means of both friction coefficients and friction factors. Variables were pin diameter. surface condition of aluminum, and test orientation with respect to rolling direction. The effects of elastic and plastic deformation states in the straight portions of the strip upon friction conditions are also addressed. © 1990 CIRP.

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CIRP Annals - Manufacturing Technology