Hydrodynamic Lubrication

A lubrication regime in which drawing die and wire are separated by a thick lubricant film so that there is no contact between the sliding surfaces. The film thickness results from high lubricant pressure in the die due to relative surface velocities as lubricant is forced through a narrow gap at the entrance of the drawing die, or squeezed out of the contact area between the die and wire surfaces in the approach zone of the drawing die.