Identification the Tool Wear Mechanisms and Forms at Drilling of a New Stainless Steels

The basic hypothesis of this science focuses on the study of cutting tool wear with regard to the elimination of occurrence of poor-quality holes when drilling into new austenitic ELC (Extra Low Carbon) stainless steels. The problem of drilling holes with diameter D=2 to 5 mm resides in the fact that 35 to 50% of these holes do not comply with prescribed requested requirements. The cutting tools – screw drills as monoliths – get damaged and wear out. The result of the damage is very often the unforeseen destruction of the cutting tools; therefore their operational lifespan is reduced. On the basis of practical experience and experiments carried out in the past 25 years, we have observed that the operational lifespan of screw drills is reduced by 50%. This work presents the results of experiments focusing on the study of the damage process in screw drills with diameter d=4 mm when drilling into new low-carbon stainless steels. The paper is to contribute to the development of the theory of the cutting process, especially with new and practical experience, and new insights on the process of cutting the technological methods - drilling.