Punch friction tests for sheet metal forming
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A previously described tensile strip test which simulates the stretching of sheet over a punch corner radius in a typical draw die was used to compare frictional effects in different sheet materials. Various grades of steel including galvanized samples were tested as well as soft and age-hardening aluminum alloy sheets. The measured friction coefficients varied over a wide range and the experiments illustrate how the straining process over the punch is influenced by both the stress-strain curve of the sheet and its friction characteristics.
KeywordsFriction Coefficient Friction Characteristic Apply Metalworking Sheet Metal Form Wall Strain
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