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Tribological evaluation of TiN and TiAlN coated PM-HSS gear cutter when machining 19MnCr5 steel |
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| Authors: | J A B O dos Santos W F Sales S C Santos A R Machado M B da Silva J Bonney E O Ezugwu |
| Affiliation: | (1) FA Powertrain, Betim, MG, Brazil;(2) Mechanical and Mechatronics Engineering, Manufacturing Research Centre, Pontifical Catholic University of Minas Gerais, Belo Horizonte, MG, Brazil;(3) Federal Technological Education Centre of Minas Gerais, CEFET MG, Belo Horizonte, MG, Brazil;(4) Faculty of Mechanical Engineering, Federal University of Uberlandia, Uberlandia, MG, Brazil;(5) Machining Research Centre, Department of Engineering Systems, London South Bank University, London, SE 1 0AA, UK |
| Abstract: | Two PVD coated powder metallurgy high speed steel (PM-HSS) gear cutters were investigated when machining helical gears made from AISI 19MnCr5 steel with hardness between 140 and 180 HV. Machining trials were carried out with gear cutters coated with TiAlN (nano layers) and TiN (mono layer). Crater and flank wears were measured and analysed after all the machining trials. Analyses of the worn tools show that the TiAlN coated gear cutter performed better than the TiN coated gear cutter. This can be attributed to its nano layers and the higher hardness of the TiAlN coating. The dominant tool wear mechanisms were adhesion, abrasion, delaminating of the coating layer and chipping of the cutting edge. |
| Keywords: | PVD coatings Milling Gear cutter Tool life Wear mechanisms |
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