Abstract
The article presents the results of studying the effects of coated (TiN, TiAlN) and uncoated polycrystalline cubic boron nitride (PCBN) machining blades on the key geometric structure parameters of the surface of hardened and tempered EN X153CrMoV12 steel after finish turning. A comparative analysis of the use of coated and coated cutting tools in finish turning of hardened steels was made. Tool materials based on polycrystalline cubic boron nitride PCBN (High-CBN; Low-CBN) have been described and characterized. The advantages of using TiN and TiAlN-coated cutting tools compared to uncoated were demonstrated. The lowest influence of the feed on the values of all tested roughness parameters was noted for surfaces treated with TiN- and TiAlN-coated tools (both with 50 vol.% of CBN). For uncoated tools (60 vol.% of CBN) for feeds f = 0.2 and 0.3 mm/rev., the highest values of Ra and Rz roughness parameters were found. Moreover, the lack of protective coating contributed to the occurrence of intense adhesive wear on the flank surface, which was also in the range of the feed values f = 0.2 and 0.3 mm/rev. The analysis of material surface after treatment with the uncoated tools with the feed f = 0.2 mm/rev. showed the occurrence of the phenomenon of lateral material flow and numerous chip deflections.
Highlights
Manufacturers of machine parts are increasingly replacing the traditional operation of grinding materials in the hardened state by turning
The problem of replacing the grinding operation with turning lies in the necessity of selecting such machining parameters and such cutting tools for which the machined surface will be characterized by possibly low surface roughness, usually defined by the Ra parameter in the required range of 0.1–2 μm, at the same time with a high material contribution to the roughness profile [3,4]
The analysis of the results showed that the tested coatings acted as a thermal barrier between the contact surface of the tool and the grains of the tool material
Summary
Manufacturers of machine parts are increasingly replacing the traditional operation of grinding materials in the hardened state by turning. It allows for constant technological progress, both in the design and technological solutions used in cutting machine tools and in the area of modern cutting materials. Comparatively high machining accuracy is achieved at a lower cost and with a lower environmental impact. This has a direct impact on the high efficiency and productivity of this treatment method [1,2]. Turning of “hard” materials is most often performed without using cooling and lubricating fluids, which results in generated temperatures exceeding 1000 ◦C in the cutting zone [5]
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