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.