Paraffinic mineral oil lubrication for cold forward extrusion: Effect of lubricant quantity and friction

In this paper, Finite Element (FE) and experimental analyses have been developed on the deformation of aluminium billet over a tool. Effect of friction resulted from the use of additive-free ISO460-compliant paraffinic mineral oil with kinematic viscosity of 455.192 mm2/s at 40 °C in amounts of 0.1, 1, 5, and 20 mg were examined. The time behaviour of displacements on the billet in the experiment was used as inputs for the FE model. The FE analysis results for load–displacement behaviour of the extrusion were compared with the experimental results. It was shown that significant differences exist between the four lubricant quantities on friction and contact pressure distribution.

► We examined performance of paraffinic palm oil in cold forward extrusion. ► High contact stresses at the taper die sharp edge caused peak load. ► Load increases with friction in steady-state condition. ► Load and contact pressure increases with friction for each lubricant quantity. ► Right amount of lubricant quantity have reduced the extrusion load.