Tool Wear Mechanisms of pcBN tooling during High-Speed Machining of Gray Cast Iron
2018; Elsevier BV; Volume: 77; Linguagem: Inglês
10.1016/j.procir.2018.08.201
ISSN2212-8271
AutoresFredrik Schultheiss, Volodymyr Bushlya, Filip Lenrick, Daniel Johansson, Stefan Kristiansson, Jan-Eric Ståhl,
Tópico(s)Advanced Machining and Optimization Techniques
ResumoThe presence of graphite particles in gray cast iron commonly implies a good machinability, especially if compared to common steels. However, increasing industrial demands have resulted in a new interest for high-speed machining of these materials with higher performing tool materials than the traditionally used. Thus, the research presented in this paper focuses on evaluating the active tool wear mechanisms while high-speed machining EN-GJL-250 gray cast iron with pcBN tools with different composition, geometries and edge preparations. In addition to the expected flank and notch wear, formation of MnS, SiO2, and Al2O3 tool protection layers was found on the worn surfaces. Non-chamfered tools exhibited higher tendency towards notching. In general, the tools were found to have a rather small wear land but large edged radius indicating edge rounding being a more accurate wear criterion.
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