1989 Volume 55 Issue 513 Pages 1289-1295
An extrusion-type friction test has been carried out to examine the critical conditions for seizure initiation at various temperatures using a commercially pure aluminium as a work metal and paraffinic mineral oils as a lubricant. As the test temperature increased or the lower the lubricant viscosity decreased, the critical punch stroke for seizure initiation decreased. The oil film thickness trapped in the micro-pools on the tool-work interface was reduced with an increase in the temperature or a decrease in the viscosity grade of lubricant. As a result, it has been clarified that the critical oil film thicknesses for seizure initiation were approximately constant ; 0.20.25μm.