Comparative evaluation of machinability characteristics of Nimonic C-263 using CVD and PVD coated tools |
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| Affiliation: | 1. Department of Biomedical Engineering, National Cheng Kung University, 1 University Road, Tainan City 701, Taiwan;2. Musculoskeletal Research Center, National Cheng Kung University, 1 University Road, Tainan City 701, Taiwan;3. Department of Occupational Therapy, National Cheng Kung University, 1 University Road, Tainan City 701, Taiwan;4. Department of Orthopedics, National Cheng Kung University Hospital, 138 Sheng Li Road, Tainan City 701, Taiwan;5. Medical Device Innovation Center, National Cheng Kung University, 1 University Road, Tainan City 701, Taiwan;1. Fraunhofer Institute for Production Technology IPT, Germany;2. Laboratory for Machine Tools and Production Engineering (WZL) at RWTH Aachen University, Germany;1. Graduate School of Science and Engineering, Kansai University;2. Faculty of Engineering Science, Kansai University 3-3-35, Yamate-cho, Suita, Osaka, 564-8680 Japan;1. Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen-Nuremberg (FAU), Dr.-Mack-Str. 81, D-90762 Fuerth, Germany;2. Rolls-Royce Deutschland Ltd. & Co. KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow, Germany;3. Chair of Materials Science and Engineering for Metals (WTM), Department of Materials Science and Engineering, Friedrich-Alexander University of Erlangen-Nuremberg, Martensstr. 5, D-91052, Erlangen, Germany |
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| Abstract: | Machining of Nimonic C-263 has always been a challenging task owing to its hot strength, low thermal conductivity, tendency to work harden and affinity towards tool materials. Although coated tools have been used to overcome some of these challenges, selection of coated tool with appropriate deposition technique is of immense significance. The current study attempts to comparatively evaluate various performance measures in machining of Nimonic C-263 such as surface roughness, cutting force, cutting temperature, chip characteristics, and tool wear with particular emphasis on different modes of tool failure for commercially available inserts with multi-component coating deposited using chemical vapour deposition (CVD) and physical vapour deposition (PVD) techniques. Influence of cutting speed (Vc) and machining duration (t) has also been investigated using both coated tools. The study demonstrated remarkable decrease in surface roughness (74.3%), cutting force (6.3%), temperature (13.4%) and chip reduction coefficient (22%) with PVD coated tool consisting of alternate layers of TiN and TiAlN over its CVD coated counterpart with TiCN/Al2O3 coating in bilayer configuration. Severe plastic deformation and chipping of cutting edge and nose, abrasive nose and flank wear along with formation of built-up-layer (BUL) were identified as possible mechanisms of tool failure. PVD coated tool successfully restricted different modes of tool wear for the entire range of cutting speed. Superior performance can be attributed to the hardness and wear resistance properties, thermal stability due to presence of TiAlN phase and excellent toughness owing to PVD technique and multilayer architecture. |
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| Keywords: | CVD coated tool PVD coated tool Nimonic C-263 Tool wear Chip characteristics |
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