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Calculation of the concentration wire drawing lubricant

  • Area reduction (A1-A2)/A1 %
  • diameter d1 mm
  • reduction angle φ deg
  • speed v1 m/s
  • viscosity η0 Pa.s
  • pressure-viscosity coefficient αp 1/GPa
  • extrusion pressure pe MPa
  • bearing length ratio Lb/d -

For full-film lubrication a film thickness / roughness ratio λ=hmin/Ra'>2...2.5

is required, where Ra'=(Ra,1+Ra,2)/2. With smooth surfaces, i.e. Ra'<0.2 a film

thickness of 0.5 µm suffices for full film elasto hydrodynamic lubrication.


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