Evaluation of the wear mechanisms and surface parameters when machining internal combustion engine valve seats using PCBN tools

This research aims to investigate the influence of cutting speed ( v c), depth of cut (doc) and feed rate ( f) on the machining of valve seats of internal combustion engines using polycrystalline cubic boron nitride (PCBN) tools. The workpiece material was Fe–C–Cu–Ni–Mo alloy obtained from powder me...

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Bibliographic Details
Published in:Journal of materials processing technology 2004-02, Vol.145 (3), p.397-406
Main Authors: Rocha, Cláudio Araújo, Sales, Wisley Falco, de Barcellos, Clovis Sperb, Abrão, Alexandre Mendes
Format: Article
Language:English
Subjects:
Combustion engines
PM workpiece
Polycrystalline cubic boron nitride
Wear mechanisms
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Summary:This research aims to investigate the influence of cutting speed ( v c), depth of cut (doc) and feed rate ( f) on the machining of valve seats of internal combustion engines using polycrystalline cubic boron nitride (PCBN) tools. The workpiece material was Fe–C–Cu–Ni–Mo alloy obtained from powder metallurgy technique. The quality of the resulting surface is fundamental for the performance of engines and was estimated by R a, R q, R z, R t and W t surface roughness parameters, while relations between surface and cutting parameters were performed. Among the cutting parameters the cutting speed was the most influent on the wear of the tools. The predominant types of wear were flank and crater, while mechanisms as attrition prevailed at low v c and diffusion at medium v c. The dynamic instability identified by accelerometers at the machine was decisive in leading to discontinuous chip flow and chipping phenomena due to low fracture toughness of tool material.
ISSN:0924-0136
DOI:10.1016/j.jmatprotec.2003.10.004