T. Nakamura et al., FEM SIMULATION OF A FRICTION TESTING METHOD BASED ON COMBINED FORWARDCONICAL CAN-BACKWARD STRAIGHT CAN EXTRUSION, Journal of tribology, 120(4), 1998, pp. 716-723
A new friction testing method based on combined forward conical can-ba
ckward straight can extrusion is proposed in order to evaluate frictio
n characteristics in severe metal forming operations. By this method t
he friction coefficient along the conical punch surface is determined
knowing the friction coefficient along the die wall. The latter is det
ermined by a combined forward and backward can extrusion of straight c
ans. Calibration curves determining the relationship between punch tra
vel, can heights, and friction coefficient for the two rests are calcu
lated based on a rigid-plastic FEM analysis. Experimental friction tes
ts are carried out in a mechanical press with aluminium alloy A6061 as
the workpiece material and different kinds of lubricants. They confir
m that the theoretical analysis results irt reasonable values for the
friction coefficient.