Cassarini, Stéphane (2007) Lubricant film modelling in the inlet zone for cold strip rolling lubrication by emulsions. PhD thesis Sciences et Génie des Matériaux, CEMEF- Centre de Mise en Forme des Matériaux, ENSMP p.199.

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Abstract

When using an emulsion as a lubricant, one often observes a speed range with stable working conditions, namely friction remains approximately constant. But at higher speeds in some cases, above a critical speed in the m/s range, accelerating increases friction. As a consequence, the rolling mill cannot reasonably work at higher speed, limiting expected productivity gains. Why does friction increase, and how to avoid it?To answer this question, we try to relate global observations in strip rolling (“average friction”, Reich et al.) and lubricant film thickness measurements by Zhu et al. in a rather different context: Elasto-Hydrodynamics (EHD). Indeed, we consider that the behaviour observed in EHD provides a viable explanation to emulsion behaviour in strip rolling.To confirm this analogy between two sharply different situations, we turned to modelling. It is necessary to analyze the mechanisms which contribute to the formation of the lubricant film in both cases. The literature offers two kinds of diphasic thin lubricant film models: Szeri's and Wilson's. We completed and coupled them, noting that each may represent correctly the conditions prevailing in the diverse parts of the contact. In lubrication, the model developed shows that emulsification-related properties, such as the size of the oil droplets and their capacity to wet the solid surfaces and form a significant "plate – out film", are much more influential than oil-related properties (viscosity).

References

[1] Felder E., Modèle de la vague, application à la modélisation de l’usure par abrasion, Cours de tribologie de la mise en forme, Ecole des Mines de Paris – Centre de Mise en Forme des Matériaux, Groupe : Surface et Tribologie.

[2] Becher P., Emulsions : theory and practice, 2nd ed., Reinhold Publishing Corp., New-York, 1965

[3] Wilson, W.R.D., et Walowit, J.A., An isothermal hydrodynamic lubrication theory for strip rolling with front and back tensions, Tribology Convention, pp. 169-172, 1971

[4] http://www.lsbu.ac.uk/water/explan2.html

[5] Lévêque P., de Werbier P. (Unirec), Biausser H. (Irsid St Germain), Fromholz C. (Irsid Maizières), Fiche technique, La revue métallurgique - CIT, Septembre 1991

[6] Vergne P., Kamel M., Querry M., Behaviour of Cold-Rolling Oil-in-Water Emulsions : A Rheological Approach, Transactions of the ASME, Vol. 119, pp. 250-258, April 1997.

[7] Vergne P., Comportement rhéologique des lubrifiants et lubrification : approches expérimentales, Mémoire pour obtenir l’habilitation à diriger des recherches, Institut national des sciences appliquées de Lyon, Université Claude Bernard, Lyon I, 2002.

[8] Fournel, B., Etude et interprétation de l’évolution des conditions d’emprise en laminage double-réduction en fonction de la réduction, la vitesse, et la lubrification., Document interne : IRSID – USINOR SACILOR, LAMEF 97 N 1180, mai 1997.

[9] Marsault N., Modélisation du régime de lubrification mixte en laminage à froid, Thèse, Ecole des Mines de Paris, Cemef, 28 mai 1998.

[10] Stéphany A., communication personnelle

[11] Szeri, A.Z., On the flow of emulsions in tribological contacts, Wear 200, pp. 353 – 364, 1996.

[12] Wilson, W.R.D., SAKAGUCHI, Y. and SCHMID, S.R., A mixed flow model for lubrication with emulsions, Tribology Transactions, Vol. 37 – 3, pp. 543-551, 1994.

[13] Reynolds, O., 1886, On the theory of lubrication and its applications to Mr Beauchamp tower’s experiments including an experimental determination of olive oil, Phil. Trans. Roy. Soc., Vol. 177, pp. 157-234.

[14] Hugues, T.G., Elcoate C.D. and Evans H.P., A novel method for integrating firstand-second-order differential equations in elastohydrodynamic lubrication for the solution of smooth isothermal, line contact problems, International journal for numerical methods in engineering, Vol. 44, pp. 1099-1113, 1999.

[15] http://fr.wikibooks.org/wiki/Tribologie_-_Lubrifiants_liquides#coefficient_de_viscosit.C3.A9-pression

[16] Molimard J., Querry M., Vergne P., Rhéologie du lubrifiant en conditions réelles : mesures et confrontation à un contact bille/disque, La revue de métallurgie – CIT / science et génie des matériaux, pp. 141-148, 2001

[17] Vergne P., Chan Hew Wai C., Propriétés et comportement rhéologiques des lubrifiants fluides pour machines tournantes, EDF-DER, Service IPN, Département PROVAL, Vol. 116, 1997.

[18] Jahanmir S., Beltzer M., An absorption model for friction in boundary lubrication, ASLE trans., Vol. 29–3, pp. 423-430, 1986.

[19] Delamare F., Lubrification limite et transfert, Cours de tribologie de la mise en forme, Ecole des Mines de Paris – Centre de Mise en Forme des Matériaux, Groupe : Surface et Tribologie.

[20] Dowson D., Higginson G.R., Elastohydrodynamic Lubrication - Fundamentals of roller and gear lubrication, Pergamon Press, Oxford, 1966.

[21] Hamrock B.J., Dowson D., Isothermal elasto-hydrodynamic lubrication of point contacts. I - Theoretical formulation, J. Lubr. Technol. (Trans ASME) 98 (1976) 223-229. III - Fully flooded results. J. Lubr. Technol. (Trans ASME) 99 (1977) 264-276

[22] Spikes H.A., Wear and fatigue problems in connection with water-based hydraulic fluids, Jour. Synth. Lubr., Vol. 4, pp. 115-135 (1987).

[23] Montmitonnet P., Felder E., Régimes de lubrification et lubrification hydrodynamique visqueuse, Cours de tribologie de la mise en forme, Ecole des Mines de Paris – Centre de Mise en Forme des Matériaux, Groupe : Surface et Tribologie.

[24] Sheu S., Wilson W.R.D., Mixed Lubrication of Strip Rolling, STLE Tribology Transaction, Vol. 37, pp. 483-493, 1994.

[25] Zhu D., Biresaw G., Clark S.J., Kasun T., Elastohydrodynamic lubrication with O/W emulsions, Transactions of the ASME, Vol. 116, pp.310-320, 1994.

[26] Reich R., Panseri N., Bohaychick J., The effects of lubricant starvation in the cold rolling of aluminium metal when using an oil-in-water emulsion, Journal of the society of tribologists and lubrication engineers, November 12, 2000.

[27] Nakahara T., Makino T., Kyogoku K., Observations of liquid droplet behaviour and oil film formation in O/W type emulsion lubrication, Transactions of ASME, Vol. 110, pp. 348-353, April 1988

[28] Kumar A., Schmid S. R., Wilson W. R. D., Particle behaviour in two-phased lubrication, Wear, Vol. 206, pp. 130-135, 1997.

[29] Gay M. N. Contribution à l’étude de la tribologie du laminage, formulation rationnelle d’une émulsion et maîtrise du frottement en laminage à froid des aciers au carbone, Thèse, Ecole des Mines de Paris, Cemef, 11 mai 1990.

[30] Kimura Y., Okada K., Lubrication properties of oil-in-water emulsions, Tribology Transactions, Vol. 32, p. 524, 1988.

[31] Ratoi-SalageanM., Spikes H. A., Optimising film formation by oil-in-water emulsions, Tribology transactions, Vol. 40-4, pp. 569-578, 1997.

[32] Einstein A., Eine neue Bestimmung der Molekuldimensionen, Ann. Phys., Vol. 19, pp. 289 - 306, 1906.

[33] Barnea E., Mizrahi J., On the effective viscosity of liquid-liquid dispersions, Ind. Eng. Chem. Fundam., Vol. 15, pp.120-125, 1976.

[34] Yan S., Kuroda S., Lubrication with emulsion, Wear, Vol. 206, pp. 238-243, 1997.

[35] Dow T.A., A rheology model for oil-in-water, Technical paper n° MS77-339, Society of manufacturing engineers, Dearborn, MI, 1977.

[36] Wan G.T.Y., Kenny P., and Spikes H., Elastohydrodynamic properties of waterbased fire-resistant hydraulic fluids, Trib. Int’l., Vol. 17, pp. 309-315, 1984.

[37] Schmid S.R., WilsonW.R.D., Lubrication of aluminium rolling by oil-in-water emulsions, Tribology Transactions, Vol. 38, pp. 452-458, 1995.

[38] Guangteng G., Cann P.M. and Spikes H., A study of parched lubrication, Wear, Vol. 153, pp. 91-105, 1992.

[39] Schmid S., Wilson W., Lubrication mechanisms for oil-in-water emulsions, STLE, Vol. 52 – 2 , pp. 168-175, 1996.

[40] Chiu Y.P., An analysis and prediction of lubricant film starvation in rolling contact systems, ASLE transactions, Volume 17, 1, pp. 22-35, 1974.

[41] Wu C.W., Sun H.X., A new hydrodynamic lubrication theory for bilinear rheological fluids, Elsevier - Journal of Non-Newtonian Fluid Mechanics, Vol. 56, pp. 253-266, 1995.

[42] Chevalier F., Lubrecht A.A., Cann P.M.E., Colin F., Dalmaz G., Film thickness in starved EHL point contacts, Trans ASME J. Trib. 120 (1998) 126-133

[43] Lugt P., Lubrication in cold rolling – Numerical Simulation Using Multigrid Techniques, Thèse, 25 Septembre 1992.

[44] Szeri A.Z., Wang S.H., An elasto-plasto-hydrodynamic model of strip rolling with oil/water emulsion lubricant, Tribology International, ELSEVIER, Vol. 37, pp. 169-176, 2004.

[45] Patlazhan S.A., Lindt J.T., Kinetics of structure development in liquid-liquid dispersions under simple shear flow theory, Journal of Rheology, 40 (6), pp. 1095-1113, 1996.

[46] Prunet-Foch B., Legay F., Vignes-Adler M., Delmotte C., Impacting emulsion drop on a steel plate : Influence of the solid substrate, Journal of colloid and interface science, 199, pp. 151-168, 1997.

[47] Stockes G.G., On the effect of the internal friction of fluids on the motion of pendulums Trans. Cambridge Philos. Soc. IX 8-106, 1851. Reprint: Mathematical and Physical Papers 2nd ed., Vol. 3 New York: Johnson Reprint Corp, p 1, 1966

[48] Azushima A., Ideue T., In Situ Measurement of Interface between Tool and Workpiece under MPH Lubrication by Means of Direct Fluorescence Observation Technique, Journal of the japan society for technology of plasticity, vol.42 no.491, December 2001.

Table of content

Chapitre 1 : Etude Bibliographique

Introduction

I. Connaissances globales des scientifiques et lamineurs en huile entière

1. Trois régimes de lubrification

2. Elasto-Hydrodynamique (EHD) et Plasto-Hydrodynamique (PHD)

3. Evolution du frottement en fonction de la vitesse

4. Conclusion

II. Paramètres influençant la lubrification par émulsion

1. Influence de la vitesse

2. Influence du taux initial d’huile

3. Influence de la taille des gouttes d’huile

4. Influence de la chimie

5. Conclusion

III. Modèles

1. Modèle à viscosité efficace

2. Modèle de Szeri

3. Modèle de Wilson

4. Modèle de sous-alimentation

5. Conclusion

Conclusion

Chapitre 2 : Entrée de l’eau ou modélisation des phénomènes hydrodynamiques

Introduction p. 83

I. Mise au point du modèle numérique sur le cas monophasique

1. Contact cylindre/plan

2. Zone d’entrée en laminage

3. Conclusion

II. Modèle diphasique de Wilson

1. Modèle : interaction des flux et huile piézo-visqueuse

2. Conditions aux limites

3. Méthodes de résolution

4. Résultats et discussion en laminage

5. Première tentative de simplification

6. Deuxième tentative de simplification

7. Analyse de hcp et Uc2

8. Etude paramétrique

9. Conclusion

III. Modèle diphasique de Szeri

1. Equations de Szeri p

2. Méthode de résolution

3. Position du ménisque

4. Résultats du modèle

5. Comparaison Szeri-Wilson

6. Modèle de Szeri lorsque rg<<h

IV. Modèle couplé Szeri-Wilson

1. Présentation

2. Continuité des modèles

3. Résultats

4. Comparaison : modèle de Szeri et modèle couplé Szeri – Wilson

5. Comparaison : modèle de Wilson et modèle couplé Szeri – Wilson

Conclusion

Chapitre 3 : Décroissance ou dégradation du plate-out

Introduction p. 151

I. Comment améliorer la physique du modèle hydrodynamique

1. Amorce du mécanisme de Wilson

2. Intégrité des piliers

3. Conclusion

II. Le plate-out

1. Formation du plate-out

2. Destruction du plate-out

3. Couplage Plate-out – Szeri – Wilson

4. Conclusion

Conclusion

Conclusion et perspectives

Bibliographie

Annexe

Statistiques de consultation

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