Research Papers: Applications

Influence of Minimum Quantity Lubrication on Friction Characterizing Tool–Aluminum Alloy Contact

[+] Author and Article Information
Frédéric Cabanettes

University of Lyon, ENISE,
58 rue Jean Parot,
Saint-Etienne 42023, France
e-mail: fcabanettes@gmail.com

Julian Rolland, Florian Dumont, Joël Rech

University of Lyon, ENISE,
58 rue Jean Parot,
Saint-Etienne 42023, France

Zlate Dimkovski

School of Business, Engineering and Science,
Halmstad University,
P.O. Box 823,
Halmstad SE-301 18, Sweden

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 4, 2015; final manuscript received October 21, 2015; published online February 15, 2016. Assoc. Editor: Daniel Nélias.

J. Tribol 138(2), 021107 (Feb 15, 2016) (10 pages) Paper No: TRIB-15-1183; doi: 10.1115/1.4031990 History: Received June 04, 2015; Revised October 21, 2015

The possibility to reduce the amount of cutting fluids from machining processes is actively studied by the industrialists and researchers. Minimum quantity lubrication (MQL) is a solution toward cutting fluids reduction. This paper investigates the consequences on friction coefficient induced by the use of MQL. A tribometer is used in order to experimentally simulate the local tribological conditions encountered during machining. As the relative sliding speed increases, a lower amount of oil is deposited on the rough surfaces. Depending on the MQL operating conditions and sliding velocities, it is plausible to reach starvation by leaving the real rough contact partly dry. A model computing a starvation percentage by filling an estimated oil amount in a deformed topography correlates with the experimental results.

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Fig. 1

The local conditions encountered in machining are reproduced by the tribometer [13]: (a) machining, (b) machining local conditions, and (c) tribometer conditions

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Fig. 2

The tribometer reproducing local conditions encountered in machining

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Fig. 3

Observation of oil particles impingement on a glass

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Fig. 4

Particles size distribution for both oils

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Fig. 5

Pin generating a groove on the bar: (a) cross section along the sliding direction and (b) cross section A–A′

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Fig. 7

Friction results presented as a percentage of dry friction

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Fig. 6

Friction results for the two oils with different oil regimes and sliding velocities: (a) fully lubricated results and (b) MQL results

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Fig. 9

Modeling of the oil mist spray projection on the bar

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Fig. 8

Sketch of the MQL contact for low and high velocities: (a) contact at low velocity V1 and (b) contact at high velocity V2

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Fig. 15

Sketch of the oil filling in the deformed geometries gap

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Fig. 10

Estimated oil volume deposited on the area of interest as a function of the linear velocity expressed in m/min

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Fig. 14

Oil (in blue) filling in the deformed geometries gap

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Fig. 18

Percentage of starvation as a function of the oil volume filled in

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Fig. 11

Pin and bar geometries before entering in contact (upper surface: pin; lower surface: bar)

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Fig. 12

Pin and bar geometries in contact for a load of 200 N (red: pin)

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Fig. 13

Bar topography deformed and cross section: (a) aluminum alloy bar deformed topography and (b) cross line of section A–A′

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Fig. 16

Procedure for filling in the gap of deformed geometries with oil: (a) top view of the deformed aluminum bar, (b) oil level case for i = −30 μm, and (c) oil film thickness for i = −30 μm

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Fig. 19

Percentage of starvation versus friction experiments



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