Abstract. This article presents the results of the studies of influence of the destruction criterion on the process of segmentation of chips in the process of treatment of VT6 titanium alloy. A series of experiments has been conducted in order to measure the cutting force, the geometry of actual chips, and the experiment's results have been analyzed and processed. Using DEFORM 2D software suite they have developed an imitation model of the milling process which is necessary for the analysis of the impact of cutting conditions on the process of chip formation.