Effects of lubricant and lubrication parameters on friction during hot steel forging

Daouben, E.; Dubois, A.; Dubar, Mirentxu; Dubar, Laurent; Deltombe, Raphaël; Dinh, N. G. Truong; Lazzarotto, L.

doi:10.1007/s12289-008-0162-5

Cited by 41 publications

(23 citation statements)

References 6 publications

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“…Table 2 shows traditional lubricants for hot forging of steel and a comparison of their properties [71]. Daouben et al [42] have studied the influence of film thickness and particle size in graphite lubrication and propose an optimum lubricant film thickness to be 30 m in order to compromise between low tool wear and sufficient friction in the flash to ensure good form filling. Warm forging of steel is performed over a wide temperature range, 200˚C -850˚C.…”

Section: Warm and Hot Forgingmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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The growing awareness of environmental issues and the requirements to establish solutions diminishing the impact on working environment as well as external environment has initiated ever increasing efforts to develop new, environmentally benign tribological systems for metal forming. The present paper gives an overview of these efforts substituting environmentally hazardous lubricants in cold, warm and hot forging as well as sheet forming and punching/blanking by new, less harmful lubricants and furthermore describes other more generic measures directed towards the same goal such as development of anti-seizure tool materials and coatings and application of structured workpiece and tool surfaces.

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Section: Warm and Hot Forgingmentioning

confidence: 99%

Environmentally benign tribo-systems for metal forming

et al. 2010

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“…The authors found that thin alcohol lubricant reduce friction significantly. Daouben et al studied the effects of film thickness and particle sizes of graphite based lubricant by using the warm hot upsetting sliding test (WHUST) at 1,100 °C [59]. The authors concluded that the film thickness in the flash zone and particle size affected the friction and wear behavior.…”

Section: Tribological Effect Of Lubricants At Elevated Temperaturesmentioning

confidence: 99%

“…Daouben et al developed the warm hot upsetting sliding test (WHUST) that simulated hot forging conditions having contact pressure, sliding velocity, contactor sliding velocity, and contactor and specimen temperatures as shown in [59]. Those factors were similar to the industrial conditions.…”

Section: Friction 3(1): 1-27 (2015)mentioning

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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“…The WHUST device has been proposed by [6].The WHUST involves a contactor which slightly penetrates a specimen and slides along its surface with a constant penetration. The adjustable parameters are the geometry of the contactor, the value of its penetration within the specimen, its sliding velocity and the contactor and specimen temperatures (see figure 1).…”

Section: General Descriptionmentioning

confidence: 99%

FEM numerical simulation of the warm and hot upsetting sliding test

Vidal‐Sallé

Dubar²,

Boyer³

et al. 2010

Int J Mater Form

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For bulk forming applications involving friction, the classical Coulomb-Amonton and Tresca-constant friction laws are not representative of the actual phenomenon when large changes in the contact pressure conditions occur. In order to address these issues, alternative friction laws has been proposed in the last decade. The present paper deals with the analysis of the stress distributions during the Warm and Hot Upsetting Sliding Test for further identification of friction parameters. A first part of the paper is devoted to the description of the mechanical and thermal device used at LAMIH for a sliding test at hot temperature with a polished contactor ironing a steel workpiece. Then, the experimental data are compared to numerical results obtained from 3D simulations of the thermo-mechanical ironing test with the finite element method. The last part of the paper presents some comparisons between numerical data obtained by different 3D finite element models on the first hand, and results of the 2D simulations (under plane stress, plane strain and generalised plane strain) and with slip line theory calculus on the second hand.

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Effects of lubricant and lubrication parameters on friction during hot steel forging

Cited by 41 publications

References 6 publications

Environmentally benign tribo-systems for metal forming

Environmentally benign tribo-systems for metal forming

Tribology in metal forming at elevated temperatures

FEM numerical simulation of the warm and hot upsetting sliding test

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