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Tool wear and machining dynamics when turning high chromium white cast iron with pcBN tools

Gutnichenko, Oleksandr LU ; Bushlya, Volodymyr LU ; Zhou, Jinming LU and Ståhl, Jan Eric LU (2017) In Wear 390-391. p.253-269
Abstract

High chromium white cast irons (HCCI) with high hardness and abrasiveness owing to a particular combination of hard primary and eutectic carbides were used as workpiece materials for longitudinal turning with binderless cBN (bcBN) and high cBN (hcBN) tools. The materials with low and high Si content were used in as-cast and quenched states. Binderless cBN is prone to cratering and flank wear, while hcBN is more prone to significant cutting edge rounding. Atypical behavior was found when machining high-Si material where the increase in cutting forces was accompanied by suppression of vibrations. The observed formation of a tool protection layer (TPL) on the tool–chip interface was found to be responsible for the improved dynamic... (More)

High chromium white cast irons (HCCI) with high hardness and abrasiveness owing to a particular combination of hard primary and eutectic carbides were used as workpiece materials for longitudinal turning with binderless cBN (bcBN) and high cBN (hcBN) tools. The materials with low and high Si content were used in as-cast and quenched states. Binderless cBN is prone to cratering and flank wear, while hcBN is more prone to significant cutting edge rounding. Atypical behavior was found when machining high-Si material where the increase in cutting forces was accompanied by suppression of vibrations. The observed formation of a tool protection layer (TPL) on the tool–chip interface was found to be responsible for the improved dynamic stability. Electron microscopy and EDX analysis revealed that the TPL consists of nanocrystalline Al2O3 with SiO2 inclusions, both present in the workpiece materials. The stability of TPL was found to depend on both workpiece and tool materials. The absence or removal of the layer resulted in the development of self-excited vibrations with a frequency of 380 Hz, which affected the machined surface.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
High chromium white cast iron (HCCI), pcBN, Self-excited vibrations, Tool protection layer (TPL)
in
Wear
volume
390-391
pages
17 pages
publisher
Elsevier
external identifiers
  • scopus:85028033952
ISSN
0043-1648
DOI
10.1016/j.wear.2017.08.005
language
English
LU publication?
yes
id
7e7eca64-da5a-4cf2-afc6-8a9d15b86e18
date added to LUP
2017-09-05 13:21:36
date last changed
2017-09-05 13:21:36
@article{7e7eca64-da5a-4cf2-afc6-8a9d15b86e18,
  abstract     = {<p>High chromium white cast irons (HCCI) with high hardness and abrasiveness owing to a particular combination of hard primary and eutectic carbides were used as workpiece materials for longitudinal turning with binderless cBN (bcBN) and high cBN (hcBN) tools. The materials with low and high Si content were used in as-cast and quenched states. Binderless cBN is prone to cratering and flank wear, while hcBN is more prone to significant cutting edge rounding. Atypical behavior was found when machining high-Si material where the increase in cutting forces was accompanied by suppression of vibrations. The observed formation of a tool protection layer (TPL) on the tool–chip interface was found to be responsible for the improved dynamic stability. Electron microscopy and EDX analysis revealed that the TPL consists of nanocrystalline Al<sub>2</sub>O<sub>3</sub> with SiO<sub>2</sub> inclusions, both present in the workpiece materials. The stability of TPL was found to depend on both workpiece and tool materials. The absence or removal of the layer resulted in the development of self-excited vibrations with a frequency of 380 Hz, which affected the machined surface.</p>},
  author       = {Gutnichenko, Oleksandr and Bushlya, Volodymyr and Zhou, Jinming and Ståhl, Jan Eric},
  issn         = {0043-1648},
  keyword      = {High chromium white cast iron (HCCI),pcBN,Self-excited vibrations,Tool protection layer (TPL)},
  language     = {eng},
  month        = {11},
  pages        = {253--269},
  publisher    = {Elsevier},
  series       = {Wear},
  title        = {Tool wear and machining dynamics when turning high chromium white cast iron with pcBN tools},
  url          = {http://dx.doi.org/10.1016/j.wear.2017.08.005},
  volume       = {390-391},
  year         = {2017},
}