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.

The phonomenon of material side flow during finish turning of EN X153CrMoV12 hardened steel with tools based on polycrystalline cubic boron nitride The study presents the results of an analysis of the phenomenon of material side flow during finish turning of EN X153CrMoV12 (H12MF GOST 5950-2000) tool steel hardened to 63±2 HRC with cutting tools made of polycrystalline composites based on polycrystalline cubic boron nitride. For an uncoated wedges of CBN 7025 the material side flow occurred for the entire range of tested cutting feed. For a CBN 8120 wedges with a TiA1N coating the side flow was observed exclusively for the cutting feed of f = 0.2 mm/rev. The researched phenomenon did not occur on the surfaces finished with a CBN 7015 tool coated with TiN.

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The experimental results prove the ability to produce layers modified by microalloying with electron-beam technology using wide range of materials. Such layers were produced due to initiating exothermic chemical reactions between the base and the thin film covered the base. This resulted in finding new phase compounds in reaction products.

W artykule w celu wyjaśnienia zróżnicowanych właściwości ostrzy skrawających z konwencjonalnej i spiekanej stali szybkotnącej podczas skrawania stali 40HM-T bez oraz w obecności płynu chłodząco-smarującego przy różnych wartościach pręd-kości skrawania, przeprowadzono badania weryfikacyjne tych ostrzy dotyczące m.in. ich składu chemicznego, twardości, struktury, objętości olejowej powierzchni oraz współczynnika tarcia. Na końcu artykułu zamieszczono zalecenia co do zakresu stosowalności badanych materiałów narzędziowych.Słowa kluczowe: konwencjonalne i spiekane stale szybkotnące, trwałość, współ-czynnik tarcia, objętość olejowa powierzchni