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Tool–chip thermal conductance coefficient and heat flux in machining : Theory, model and experiment

Kryzhanivskyy, V. LU ; Saoubi, R. M’ ; Ståhl, J. E. LU and Bushlya, V. LU (2019) In International Journal of Machine Tools and Manufacture 147.
Abstract

This study proposes a technique for determining a tool–chip thermal conductance coefficient and heat flux in machining. The technique is based on solving an inverse heat transfer problem (IHTP). Because the IHTP is ill-posed, a priori information is required for its effective solution. To derive this information, substantial qualitative and quantitative analysis of a mixed boundary value problem for the heat equation and an illustrative test case for IHTP are provided. It has been established that the averaged interfacial chip temperature is needed for an effective IHTP solution. Thermal imaging combined with a special experimental setup was used to determine chip temperature. It was also found that a function describing the heat flux... (More)

This study proposes a technique for determining a tool–chip thermal conductance coefficient and heat flux in machining. The technique is based on solving an inverse heat transfer problem (IHTP). Because the IHTP is ill-posed, a priori information is required for its effective solution. To derive this information, substantial qualitative and quantitative analysis of a mixed boundary value problem for the heat equation and an illustrative test case for IHTP are provided. It has been established that the averaged interfacial chip temperature is needed for an effective IHTP solution. Thermal imaging combined with a special experimental setup was used to determine chip temperature. It was also found that a function describing the heat flux time dependency belongs to a set of decreasing functions. Tool–chip thermal conductance coefficients were obtained for high-speed steel and cemented carbide tooling. On the microscale, this data was interpreted in terms of a conforming rough surface contact conductance model, where tool wear was found to govern variations in the thermal conductance coefficient.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heat flux, Inverse method, Machining, Tool–chip thermal conductance coefficient
in
International Journal of Machine Tools and Manufacture
volume
147
article number
103468
publisher
Elsevier
external identifiers
  • scopus:85072706889
ISSN
0890-6955
DOI
10.1016/j.ijmachtools.2019.103468
language
English
LU publication?
yes
id
8558600f-d917-43c6-885f-ae0e43f75ae3
date added to LUP
2019-10-07 07:47:47
date last changed
2020-01-13 02:27:00
@article{8558600f-d917-43c6-885f-ae0e43f75ae3,
  abstract     = {<p>This study proposes a technique for determining a tool–chip thermal conductance coefficient and heat flux in machining. The technique is based on solving an inverse heat transfer problem (IHTP). Because the IHTP is ill-posed, a priori information is required for its effective solution. To derive this information, substantial qualitative and quantitative analysis of a mixed boundary value problem for the heat equation and an illustrative test case for IHTP are provided. It has been established that the averaged interfacial chip temperature is needed for an effective IHTP solution. Thermal imaging combined with a special experimental setup was used to determine chip temperature. It was also found that a function describing the heat flux time dependency belongs to a set of decreasing functions. Tool–chip thermal conductance coefficients were obtained for high-speed steel and cemented carbide tooling. On the microscale, this data was interpreted in terms of a conforming rough surface contact conductance model, where tool wear was found to govern variations in the thermal conductance coefficient.</p>},
  author       = {Kryzhanivskyy, V. and Saoubi, R. M’ and Ståhl, J. E. and Bushlya, V.},
  issn         = {0890-6955},
  language     = {eng},
  month        = {12},
  publisher    = {Elsevier},
  series       = {International Journal of Machine Tools and Manufacture},
  title        = {Tool–chip thermal conductance coefficient and heat flux in machining : Theory, model and experiment},
  url          = {http://dx.doi.org/10.1016/j.ijmachtools.2019.103468},
  doi          = {10.1016/j.ijmachtools.2019.103468},
  volume       = {147},
  year         = {2019},
}