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3. Friction under the punch
A hydrodynamic film can form under the punch if the lubricant is present in excess of the sheet's roughness (see 1.2.3). We first present the theory of this effect, then specify the orders of magnitude of friction if the hydrodynamic effect is negligible. A summary of these two aspects without numerical simulation is presented in § 5.1.1.
3.1 Excess weight: hydrodynamic effect under the punch
Lubricant viscosity can induce hydrodynamic effects that reduce metal-tool interactions in stamping. For example, a lubricant film may form at the sheet metal-punch contact due to viscous entrainment of the lubricant by the sheet metal under the punch. Wilson and Wang [18] have modeled the formation of a lubricating film from a lubricant of viscosity η ...
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Friction under the punch
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