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.