A tool with a combined effect - cutting and subsequent burnishing is developed, to increase productivity of hole drilling technology. This ensures low roughness, greater accuracy in dimensions and shape of the surfaces, and improved physical and mechanical characteristics. One of the main features in the operation of the tool mentioned is the inclusion of guide elements (most often two), which make contact with the walls of the previously processed section of the hole. The paper presents the results of the microstructure study conducted on the surface plastically deformed layers of steel S355, processed using the combined tool hereto outlined. The analysis of the studied microstructures reveals the formation of a compressive area with a higher microhardness of approximately 80µm.

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