High speed turning for hard material with PCBN inserts: tool wear analysis Online publication date: Sun, 23-Mar-2008
by Farouk Mahfoudi, Gautier List, Alain Molinari, Abdelhadi Moufki, Lakhdar Boulanouar
International Journal of Machining and Machinability of Materials (IJMMM), Vol. 3, No. 1/2, 2008
Abstract: Because of tool wear, High Speed Machining (HSM) is rarely used for hard turning process and the cutting speeds are generally selected around 100 or 200 m/min. In this work, HSM is performed for hard turning of a 50 HRC hardened steel (AISI 4140/42CrMo4) with a PCBN tool by using high cutting speeds (300 and 400 m/min). The results show that HSM for hard turning can be acceptable for industrial application by providing very good surface roughness and keeping significant tool life. A qualitative correlation is also presented between the crater wear and the temperature distribution at the tool-chip interface, predicted by a thermomechanical model. Flank wear, crater wear and surface roughness are examined in order to choose an appropriate wear criterion. Investigations by SEM/EDS and white light interferometry highlight the importance of crater wear and help us to better understand the role of chemical/diffusion phenomena in wear mechanisms.
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