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This paper deals with the machining of the hardened steel with carbide endmills. In the research, several different milling tools are compared in terms of their durability during machining of hardened steel. For the cutting tools different geometry, thin-film deposition or substrate of tool material, were used. The main aim is comprehensively compare all cutting tools. For the test workpiece material DIN X210Cr12 was used. Normally this material is used for producing of highly stressed molds, grinding tools or tools for cold forming. Cutting conditions are detected in the first part of the experiment, which is a short-term test according to A. S. Kondratov. Cutting conditions are used in the second part of the experiment, which is a long-term test of all tools. During the side milling of hardened steel, the flank wear is measured and durability of each tool is determined. The results of this work will be used for further research and development of cutting tools for hard machining

Durability of Cutting Tools during Machining of Very Hard and Solid Materials