The subject matter of this paper is to research the friction factor defining contact conditions in deformation treatment. A very frequently used method of determining friction factor is by means of experimentally determined curves obtained on the basis of ring deformation. The results of various authors have been compared and significant differences have been stated in this paper. Taking into consideration the expansion of the numerical programme packages based on FEM simulation in this field, it is important to determine numerically the friction factor in wide range of possible values. This is a method of experimental-numerical friction factor determination has been proposed in this paper, thus giving possibilities for its precise determination. The friction factor determined in this way gives the results of numerical analysis close to real ones.
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