Research of oil film thickness model and surface quality in cold rolling copper foil

Sun, Jianlin; Liu, Nana; Xia, Ling; Wu, Di

doi:10.1002/ls.1231

Cited by 5 publications

(7 citation statements)

References 11 publications

(18 reference statements)

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“…Surfactants added to the rolling oil form a lubricating film, nanometers thick, 3 by physical or chemical adsorption on the surface of the foil; this inhibits deeper corrosion, and acts as a protective barrier between the metal and its environment. 4 It also has a substantial effect on the conducting properties of the copper foil. 5 In a series of studies, Gagnon 6 showed that fretting corrosion and the severity of wear can usually be reduced by use of lubricants, which reduced contact resistance without having adverse affects.…”

Section: Introductionmentioning

confidence: 99%

Effect of Lubricants and Annealing Treatment on the Electrical Conductivity and Microstructure of Rolled Copper Foil

Xiong

Sun

et al. 2015

Journal of Elec Materi

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X-ray diffraction and transmission electron microscopy have been used to study the microstructure of copper foil during rolling. Annealing was used to release work hardening of rolled copper foil (RCF), and electrical conductivity was determined by use of a PPMS-9 comprehensive physical property-measurement system. The microstructure and electrical conductivity of RCF are discussed. Our results showed that the relative intensity of the (220) diffraction peak increased continuously with decreasing sample thickness and that rolling induced preferred orientation. Many obvious crystallographic defects were present; these seriously affected electrical conductivity. The electrical conductivity of RCF decreases with increasing lattice distortion and micro defects which occur during deformation, especially when the surface adsorbs lubricant. However, annealing reduced lattice distortion and the scattering of conducting electrons at these defects, thus improving the electrical properties. For foil thickness in the range 25-180 lm, annealing temperatures in the range 150-300°C, and annealing times in the range 2.5-3.0 h, the electrical conductivity of RCF increased with increasing thickness and annealing temperature, and decreased with increasing annealing time.

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Section: Introductionmentioning

confidence: 99%

Effect of Lubricants and Annealing Treatment on the Electrical Conductivity and Microstructure of Rolled Copper Foil

Xiong

Sun

et al. 2015

Journal of Elec Materi

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“…The strip enters the deformation zone and begins to deform when the oil film pressure reaches the strip deformation resistance. The increased behaviour of the oil pressure is indicated by the Reynolds equation [1], as expressed in Equation (5).…”

Section: Oil Film Thickness Formation and Variation Mechanism In The ...mentioning

confidence: 99%

“…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. Fujita et al [7], Wei et al [8], and Zheng et al [9] improved the vibration stability by controlling the lubricity in high speed cold rolling.…”

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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“…As a widely used and important non-ferrous metal material, the lubrication in the production process has been of wide concern in order to produce a rolled copper foil with excellent properties. The application of lubrication technology in the production process of rolled copper foil can effectively reduce the minimum rolling thickness, improve flatness, and decrease energy consumption [3,4]. However, the rolling oil used in lubrication may cause corrosion to the surface of rolled copper foil and then affect the quality of rolled copper foil.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Characteristics of Rolling Oil on the Rolled Copper Foil

Xia

Zhao³

et al. 2020

Materials

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Static corrosion experiments were carried out to investigate the corrosion of each kind of component in the rolling oil on the rolled copper foil. The surface morphology and chemical composition of corrosion products were detected by a digital camera, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that the maximum corrosion rate of rolled copper foil in the base stock and friction modifiers (butyl stearate and dodecanol) was close to zero, while that of rolled copper foil in the N-containing borate, phosphate and the fully formulated rolling oil were 0.17, 1.12 and 0.78 mm/a, respectively. The color of rolled copper foil changing from pink into purple-black when corroded in the N-containing borate. The composition of it was mainly CuO and Cu2O with some N-containing borate adsorbed on it. However, the color and composition of the corroded copper foil in the phosphate were similar to that of the original copper foil. It was complicated for the corroded copper foil in the fully formulated rolling oil, which showed characteristics both in the N-containing borate and in the phosphate according to different positions. It indicated that there might be little corrosion for the base stock and friction modifiers on the rolled copper foil. It might mainly be extreme pressure additives (N-containing borate and phosphate) that caused the corrosion of rolled copper foil. There might be competition between N-containing borate and phosphate for the corrosion of rolled copper foil in the fully formulated rolling oil, resulting in a lower corrosion rate compared with that in the phosphate.

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Research of oil film thickness model and surface quality in cold rolling copper foil

Cited by 5 publications

References 11 publications

Effect of Lubricants and Annealing Treatment on the Electrical Conductivity and Microstructure of Rolled Copper Foil

Effect of Lubricants and Annealing Treatment on the Electrical Conductivity and Microstructure of Rolled Copper Foil

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

Corrosion Characteristics of Rolling Oil on the Rolled Copper Foil

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