Wall friction coefficient estimation through modelling of powder die pressing experiment

Forming of PM components through powder pressing is a process, which is inf luenced by the friction between the powder and the tool walls. For good per formance of the pressing process it is uf great interest to understand and estimate the effects of powder-wall friction. However, quantification of th e friction coefficient between the powder and the tool is a delicate task. Local contact conditions, such as contact stress, must be measured or other wise estimated in order to evaluate the coefficient of friction. Here, the friction coefficient is estimated by combining an experiment with modelling of the experiment. Two methods for assessment of friction are presented, a n optimisation approach using finite element analyses and an analytical app roach. Experimental data are taken from the single action cold pressing of a cylinder shaped component.