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Research Papers: Tribochemistry & Tribofilms

Physicochemical Analysis of Machine Hammer Peened Surface Structures for Deep Drawing: Determination of the Work of Adhesion and Spreading Pressure of Lubrication to Surface Structure

[+] Author and Article Information
D. Trauth

Department of Grinding and Forming,
Laboratory for Machine Tools & Production
Engineering WZL,
RWTH Aachen University,
Steinbachstr. 19,
Aachen 52074, Germany
e-mail: d.trauth@wzl.rwth-aachen.de

F. Klocke

Department of Grinding and Forming,
Laboratory for Machine Tools & Production
Engineering WZL,
RWTH Aachen University,
Steinbachstr. 19,
Aachen 52074, Germany
e-mail: f.klocke@wzl.rwth-aachen.de

M. Terhorst

Department of Grinding and Forming,
Laboratory for Machine Tools & Production
Engineering WZL,
RWTH Aachen University,
Steinbachstr. 19,
Aachen 52074, Germany
e-mail: m.terhorst@wzl.rwth-aachen.de

P. Mattfeld

Department of Grinding and Forming,
Laboratory for Machine Tools & Production
Engineering WZL,
RWTH Aachen University,
Steinbachstr. 19,
Aachen 52074, Germany
e-mail: p.mattfeld@wzl.rwth-aachen.de

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received July 16, 2014; final manuscript received November 17, 2014; published online December 12, 2014. Assoc. Editor: Min Zou.

J. Tribol 137(2), 022301 (Apr 01, 2015) (7 pages) Paper No: TRIB-14-1167; doi: 10.1115/1.4029199 History: Received July 16, 2014; Revised November 17, 2014; Online December 12, 2014

Increasing demands concerning the performance of tribological systems for metal forming due to ecological restrictions or increased process loads demand the development of innovative tribological solutions. In preliminary works, it could be shown that surface structures on deep drawing tools manufactured by the incremental forming process machine hammer peening (MHP) have the potential to reduce friction. The friction reduction can be observed in strip drawing when comparing different surface structures against a state-of-the-art reference. A subsequently conducted wear analysis showed an adhesive wear on the structures. This leads to the conclusion that the lubricant film breaks due to increased contact pressures. In order to optimize the wetting of the lubricant and to avoid film break-ups, the molecular interactions in terms of the work of adhesion and spreading pressure between lubricant and MHP tool surfaces are investigated from a physicochemical point of view in this research work. The investigation approach is based on the use of the drop shape analysis.

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References

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Figures

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Fig. 1

Methodologies using drop shape analysis in Sec. 3

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Fig. 2

Illustration of contact mechanics of MHP (a) and the produced surface structures by MHP (b) [6]

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Fig. 3

Results of strip drawing test: (a) using 13 g/m2, (b) and 4 g/m2, and (c) lubrication [6]

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Fig. 4

Results of the wear analysis using friction coefficient (a) and SEM analyses (b). SPCS = Name for a TiCN coating from Eifeler Werkzeuge GmbH, Germany [8].

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Fig. 5

Exemplarily illustration of the contact angle using sessile drop method. The contact angle is nearly constant because the contact conditions at the front of the increasing drop remain stable with increasing drop size.

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Fig. 6

Wetting envelopes of the structures, sheet metal, and placement of the lubricants. SFT = surface tension of solids (mN/m); IFT = interfacial tension of lubricants (mN/m).

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Fig. 7

Determination of the surface tension using pendant drop method

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Fig. 8

Work of adhesion between the selected solids and lubricants (a)–(e) using sessile drop method (static angle)

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Fig. 9

Spreading pressure between the selected solids and lubricants (a)–(e) using sessile drop method (static angle)

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