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Five-axis milling technologies are now used to produce geometrically complex parts for the aerospace industry, such as turbine blades and rotors, and compressors. However, processing such complex elements is still a technological problem. On the one hand, this results from the required dimensional and shape accuracy as well as high surface quality, on the other hand from the desire to maximize the efficiency of the process [6-8, 10]. Most often machining of complex surfaces is used in the rounding with the ball nose end mill strategy. It allows to make surfaces of any shape. The disadvantage of this strategy is that it has very low efficiency. In the case of machining of ruled surfaces, it is possible to use conical tool for flank milling (fig. 1) and obtain much higher machining efficiency compared to the possibilities offered by common strategy [8, 10]. a) b)

Simulation tests of the cutting force in the process of machining of ruled surfaces with a conical mill