Onset of Galling

Onset of Galling in Ironing with Different Lubricants

Galling is an important issue in metal forming. To understand the galling, we studied critical sliding length in strip reduction with different lubricants at varying tool temperatures in order to estimate the onset of galling.  The Strip Reduction Test (SRT) emulates ironing is adopted, and is suitable to examine the lubrication film breakdown under severe tribological conditions between tool die and workpiece materials as regards to high normal pressure, sliding length, low sliding velocity, high surface expansion and interface pressure.