The thesis presents the influence of processing parameters, such as cutting speed and feed on durability of circular saws intended for sawing graphite commutators into segments. Moreover, the influence of different protective coatings on durability of circular saws was studied. Protective coatings are used to reduce friction and cutting forces and increase tool durability. In this study various protective coatings based on TiAlSiN and AlCrN were used. We researched and compared how different parameters and different protective coatings affects the average number of manufactured pieces per saw. We found that appropriate parameters and the right protective coating can reduce tool wear and increase service life of circular saws.
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