Mechanical conditions in bulk metal forming tribometers—Part one

Groche, Peter; Müller, Christoph; Stahlmann, Jörg; Zang, Sebastian

doi:10.1016/j.triboint.2012.12.008

Cited by 47 publications

(30 citation statements)

References 29 publications

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“…Friction coefficients may depend on various parameters, such as contact pressure, material flow stress, relative sliding velocity, and other factors [1]. It is also well known that the friction coefficient may change during the process [2]; however, evaluation of this complicated phenomenon is subject to devoted tribological tests [3] and [4]. This challenge is usually overcome by a simple friction model with single and easy-to-determine friction coefficients.…”

Section: Introductionmentioning

confidence: 99%

Determination of Coulomb’s Friction Coefficient Directly from Cylinder Compression Tests

Duran

Karadoğan

2016

Stroj. vest. - Jour. Mech. Eng.

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Section: Introductionmentioning

confidence: 99%

Determination of Coulomb’s Friction Coefficient Directly from Cylinder Compression Tests

Duran

Karadoğan

2016

Stroj. vest. - Jour. Mech. Eng.

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“…Mori et al observed the influence of localized heating of shearing zone in the punching of ultra-high strength steel sheet on punch load and tool life [69]. Groche et al differentiated tribometers under different loading conditions, for instances, pin-on-disc test, ring compression test and double cup extrusion [70,71]. Despite the fact that there are many tribometers for cold metal forming, the tribometers for hot metal forming are considerably few.…”

Section: Tribometers In Metal Forming At Elevated Temperaturesmentioning

confidence: 99%

Tribology in metal forming at elevated temperatures

et al. 2015

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Abstract:The tribo-characteristics of metal forming at high temperatures have not yet been well understood due to the complex nature of thermal, microstructural, interaction, and process parameters. This is a review paper on the effects of temperature, coating, and lubrication to the tribological characteristics in hot forming as well as the tribometers for different metal forming processes at elevated temperatures mainly based on the experimental work. The tribological behaviors of oxides in hot forming, such as rolling and stamping, were reviewed and presented. Some commonly used surface coatings and lubricants in hot forming were given. Many types of tribometer were selected and presented and some of them provided a great potential to characterize friction and wear at elevated temperatures. Nevertheless, more testing conditions should be further investigated by developing new tribometers. Eventually, experimental results obtained from reliable tribometers could be used in theory and model developments for different forming processes and materials at high temperatures. The review also showed the great potential in further investigations and innovation in tribology.

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“…There are various theoretical or experimental studies in simple upsetting related to the investigation of interfacial friction and material deformed behavior in the area of metal forming. In this study, the most widely used method of ring compression test rst proposed by Kunogi and developed by Male and Cockroft have been applied [25][26][27][28][29] . The objective of this investigation is to study interfacial friction and material deformed behavior aimed at the adhesive friction state.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Interfacial Friction and Inverse Flowing Behavior under the Adhesive State

2016

Mater. Trans.

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This paper has been retracted by the Editorial Committee of Mater. Trans. due to substantial overlap with the following paper previously published in another journal.Int J Adv Manuf Technol (2015) 79:255-263 Evaluation of rheological behavior and interfacial friction under the adhesive condition by upsetting method W.Q. Li Q.X. Ma (Received April 14, 2014; Accepted January 14, 2015; Published February 3, 2015) And thus, it shall not be regarded as an original paper.Materials Transactions, Vol. 58, No. 7 (2017) For improving the precision of numerical simulations in metal forming, it is critical to accurately evaluate the interfacial friction between die/specimen and material deformed behavior. However, there is a huge challenge to assess interfacial friction and material deformed behavior due to the complex mechanisms of tribology at the interfaces. In this study, a program of experimental work directed by ring upsetting has been carried out to evaluate interfacial friction and material deformed behavior on account of the speci c adhesive friction state. The behavior of adhesive friction was qualitatively identi ed with characterized phenomenon and quantitatively identi ed with friction coef cient, which was obtained by taking advantage of Boltzmann distribution characteristics between the radial velocity eld and the relative displacements relevant to metal particles on the meridian plane. Furthermore, simple mathematics methods were applied to analyze inverse owing behavior under the condition of adhesive friction based on the transients displacement achieved by ring upsetting. And the driven mechanism of inverse owing behavior was also revealed systematically. Finally, a new theory of bi-directionality theory was proposed to illustrate inverse owing behavior, and the sustainability of adhesive friction was synthetically analyzed.

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Mechanical conditions in bulk metal forming tribometers—Part one

Cited by 47 publications

References 29 publications

Determination of Coulomb’s Friction Coefficient Directly from Cylinder Compression Tests

Determination of Coulomb’s Friction Coefficient Directly from Cylinder Compression Tests

Tribology in metal forming at elevated temperatures

Investigation of Interfacial Friction and Inverse Flowing Behavior under the Adhesive State

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