Estimation model of plate-out oil film in high-speed tandem cold rolling

Fujita, Noriki; Kimura, Yukio; Kobayashi, Kōji; Amanuma, Yosuke; Sodani, Yasuhiro

doi:10.1016/j.jmatprotec.2015.01.002

Cited by 25 publications

(5 citation statements)

References 12 publications

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“…6 Oil film thickness of the outlet is used to replace that of the rolling zone in literature. [20][21][22] A regression formula of the oil film thickness for stainless steel cold rolling was derived in literature. 22 Therefore, the average pressure, outlet temperature, and outlet film thickness will be used to indirectly verify the calculation model.…”

Section: Calculation and Validationmentioning

confidence: 99%

“…So, the oil-in-water (O/W) emulsion has commonly been used in cold rolling. [19][20][21][22] In Liu et al 1 and Lo et al, 19 the effect of concentration of the emulsion on oil film thickness and pressure were investigated under mixed lubrication. The lubricant was treated as a mixture of continuous phase water and discrete phase oil droplets.…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive mathematical model for an accurate calculation of the oil film thickness of strip cold rolling

Bian

Wang

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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The surface quality of cold rolled strip is related to a greater extent on the rolling oil film thickness, and there are many factors that affect the oil film thickness. Considering the various factors comprehensively, an integrated mathematical model is established, such as roughness of rolls and strips, elastohydrodynamic lubrication, friction heat and plastic deformation heat in the rolling zone, viscosity varying with temperature and pressure, etc. A series of equations are developed, such as the Reynolds equation of partial membrane hydrodynamic lubrication based on average flow theory, equation of oil film thickness on rough elastic surface, the thermal interface equations between strip, oil film and roller surface, surface asperity contact pressure equation, lubricant viscosity and density equations, motion equation of the oil film, etc. This model is solved by finite difference method to get the film pressure, oil film thickness, and temperature distribution in the rolling zone. The average rolling pressure, the roll, and strip temperature calculated by the model are very close to the field test results. Comparing the minimum film thickness calculated by the model with the regression formula of other literature test, the error is less than 10%. The minimum oil film thickness is analyzed. It increases with the decrease of the rolling force and is approximately proportional to the rolling speed and lubricant viscosity.

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Section: Calculation and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comprehensive mathematical model for an accurate calculation of the oil film thickness of strip cold rolling

Bian

Wang

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Azushima and Inagaki [1] and Azushima et al [2] proposed a numerical estimation method for oil film thickness during cold rolling by combining conventional starvation and plate out models. Kimura et al [3] and Fujita et al [4] established an estimation model of plate out oil film by experimentally investigating the influences of plate out time, emulsion flow, emulsion concentration, and oil droplet size on plate out oil film formation characteristics. Sun et al [5] and Wu et al [6] developed a theoretical model for mixed lubrication and analysed the effects of surface roughness, rolling speed, rolling reduction, and rolling oil viscosity on oil film thickness in the deformation zone.…”

Section: Introductionmentioning

confidence: 99%

“…[3] and Fujita et al. [4] established an estimation model of plate out oil film by experimentally investigating the influences of plate out time, emulsion flow, emulsion concentration, and oil droplet size on plate out oil film formation characteristics. Sun et al.…”

Section: Introductionmentioning

confidence: 99%

Model and influence factors of oil film thickness in the deformation zone of double cold reduction mill

Cui

et al. 2019

Ironmaking & Steelmaking

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In the double cold rolling process, oil film thickness in the deformation zone is a key parameter for evaluating rolling lubricity. This study investigated the formation and variation mechanism of oil film thickness on the strip and work roll surface in double cold reduction mill. Subsequently, a calculation model of oil film thickness in the deformation zone of double cold reduction mill was established by combining of the plate out theory and hydrodynamic lubrication principle. Moreover, the influence of emulsion flow, emulsion concentration, emulsion plate out distance, rolling speed, bite angle, entry deformation resistance, back tension, oil initial kinetic viscosity, and oil pressure viscosity coefficient on the oil film thickness were quantitatively analysed. The oil film thickness was achieved with an accuracy greater than 90% through a field application of this calculation model, which provides theoretical foundation for the lubricity control of double cold reduction rolling.

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“…Many scholars have conducted numerous studies for emulsion rolling lubrication technology. Kimura and Fujita [1][2][3] established an estimation model of plate-out oil film after experimentally investigating the influences of plate-out time, emulsion flow, emulsion concentration, and oil droplet size on plate-out oil film formation characteristics through laboratory tests; then, these authors developed a hybrid lubrication system by combining recirculation and direct application systems. Azushima 4,5) proposed a numerical estimation method for oil film thickness during cold rolling by combining conventional starvation and plate-out models.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Optimization Control Technology of Rolling Energy and Oil Consumption in Double Cold Rolling

et al. 2019

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In double cold rolling process, rolling energy and oil consumption is normally controlled separately, thereby causing a high comprehensive cost. This study investigated a calculation model of plate-out oil film thickness on strip surface, oil film thickness in deformation zone, friction coefficient, bite angle, forward slip, rolling force, rolling power, rolling energy consumption, and rolling oil consumption. Subsequently, the effect of emulsion flow and concentration on rolling energy and oil consumption comprehensive cost was quantitatively analyzed. On this basis, an objective function of rolling energy and oil consumption comprehensive cost was proposed, and the corresponding comprehensive optimization control technology for rolling energy and oil consumption was developed. Through a field application of this technology, the reduction of rolling energy and oil comprehensive consumption cost was achieved by optimizing emulsion flow and concentration comprehensively. Thus, a significant economic benefit was created with further popularization and application values.

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Estimation model of plate-out oil film in high-speed tandem cold rolling

Cited by 25 publications

References 12 publications

A comprehensive mathematical model for an accurate calculation of the oil film thickness of strip cold rolling

A comprehensive mathematical model for an accurate calculation of the oil film thickness of strip cold rolling

Model and influence factors of oil film thickness in the deformation zone of double cold reduction mill

Comprehensive Optimization Control Technology of Rolling Energy and Oil Consumption in Double Cold Rolling

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