Symptoms of wear HSS cutting tools in different wear stages

Planning a process of production, among other machining processes, is an important stage in the production products. The developed should allow parts with planned dimensional accuracy and specified surface roughness. With reference to above, scope carried out theoretical work included determining dependences between parameters drilling process, tool wear, as well impact these on hole quality. main aim experimental research was analyse cutting tools wear various phases usage. consisted observation metallographic microsections changes occurring drill bit microstructure. Then microhardness measured next step micro-hardness tested drills statistically compared. Based results obtained, percentage for bits depending estimated taking into account earlier esti-mated Percentable Production Cycle (PPC). This allowed degree tear by comparing microstructure them. aspects management are also discussed.