Cutting Performance of Diamond Coated Si₃N₄ Tool During Turning

Abstract:

Silicon nitride cutting tools have been used successfully for machining hard materials, like: cast irons, nickel based alloys, etc. However these cutting tools with diamond coating present little information on dry turning operations of gray cast iron. In the present work, Si3N4 square inserts was developed, characterized and subsequently coated with diamond for dry machining operations on gray cast iron. All experiments were conducted with replica. It was used a 1500, 3000, 4500 m cutting length, feed rate of 0.33 mm/rev and keeping the depth of cut constant and equal to 1 mm. The results show that wear in the tool tips of the Si3N4 inserts, in all cutting conditions, was caused by both mechanical and chemical processes. To understand the tool wear mechanisms, a morphological analysis of the inserts, after experiments, has been performed by SEM and optical microscopy. Diamond coated PVD inserts showed to be capable to reach large cutting lengths when machining gray cast iron.

• Periodical: Materials Science Forum (Volumes 660-661)
• Pages: 106-111
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.660-661.106
• Online since: October 2010
• Authors: José Vitor C. Souza, Maria do Carmo de Andrade Nono, João Paulo Barros Machado, Olivério Moreira Macedo Silva, F.C.L. Melo, M.V. Ribeiro
• Keywords: Diamond Coating, Gray Cast Iron, Silicon Nitride, Tool Wear, Turning

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