The basic hypothesis of this article focuses on the study changes in mechanical properties of stainless steels XCr17Ni7MoTiN under surface finish when drilling. The problem of drilling holes with diameter D=10 mm resides in the fact that 30 to 40% of these holes do not comply with prescribed requested requirements. This article presents the results of experiments focusing on the study of the damage process in helical drills with diameter d=10.0 mm when drilling into austenitic stainless steel XCr17Ni7MoTiN. This study also includes an analysis of accompanying phenomena in the cutting zone by measuring some selected parameters. Experimental results were verified in the production of holes in products for the food industry.

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Durability of the cutting tools is very complex process that is influenced by more factors. To the Identify these factors is necessary execute many experiments. The technical science defines the basic method for determining durability of the cutting tool according to results and knowledge F. W. Taylor. The Literature from renowned authors indicates that durability of the cutting tool is defined on the base of T-vc dependence. T-vc dependence like a elementary durability dependence was described according to Taylor´s graphics dependence VB=f(s) for different cutting speeds in 1906. From this theory were later derived others theories, that became the basis of theories durability of cutting wedge for the different cutting materials. For the durability identification of the cutting tool are in technical practice used two basic tests. The First is the short-term durability test and second is machining long-term test method. Both these tests have some advantages and some disadvantages that are described in Introduction of this paper. This paper describes how to create and analytically express new durability dependence for ceramic cutting tool on the base of vc-VB dependence. This dependence consists from vc - cutting speed and VB - criterion of blunting. The whole procedure and its analytical expression is the subject of this paper.

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