Determination of rational friction temperature in lengthwise rolling

Albagachiev, A. Yu.; Keropyan, A. M.; Gerasimova, A. A.; Кобелев, О. А.

doi:10.17580/cisisr.2020.01.07

Cited by 24 publications

(9 citation statements)

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“…The heat,released at the moment of deformation,is evenly distributedthrough the volume, and it results in an average temperature increase(deformation perturbation) by 20...50 0 С. The received results correlate well with similar studies by the authors [21][22][23][24][25].…”

Section: Numerical Implementation Of the Mathematical Modelsupporting

confidence: 86%

“…• provided convective air cooling, which, depending on the character of the movement (laminar or turbulent), is determined according to the calculated value of Nusselt number [21][22][23][24][25]:…”

Section: Implementation Of the Mathematical Model For Calculating A Steel Billet Thermal Statementioning

confidence: 99%

“…where σ is Stefan-Boltzmann constant; T air is an ambient (air) temperature. According to the works [21][22][23][24][25], the coefficient of radiative heat transferbetween the strip and the ambient (air) temperature (for steel) is determined:…”

Section: Implementation Of the Mathematical Model For Calculating A Steel Billet Thermal Statementioning

confidence: 99%

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An Experimental Study of the Thermal State of a Steel Billet during Hot Rolling

et al. 2021

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The technology of hot flat rolling is a complex technological process that includes multiple shaping of a steel billet, the temperature of a bullet ranging from 1100 to 900 degrees [1-6]. To deform a workpiece, mill rolls are used. The control over a workpiece thermal state is an important task aimed at the quality of its manufacturing [7-13]. To achieve the goal, a mathematical model is developed for calculating a steel billet thermal state. The model makes it possible to determine a temperature distribution along the whole length of a workpiece. The study results are useful for researchers and developers of the hot rolling technology, and they can be applied in the organization of the rolling process with an allowance for the temperature distribution. Based on the results, the parameters of steel billet production can be adjusted or changed [14-18].

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Section: Numerical Implementation Of the Mathematical Modelsupporting

confidence: 86%

Section: Implementation Of the Mathematical Model For Calculating A Steel Billet Thermal Statementioning

confidence: 99%

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An Experimental Study of the Thermal State of a Steel Billet during Hot Rolling

et al. 2021

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“…During mechanical and electric discharge effects, heat is practically immediately generated in crystal cells of processing metal. Contradictory data on this problem are presented in different investigations [10][11][12].…”

Section: Materials and Methods Of The Researchmentioning

confidence: 99%

“…To determine the distribution coefficient D of heat flows between rolled strip and rolls during electric discharge rolling, owing to short time of the process we can use F. Sharron's formula [10].…”

Section: Materials and Methods Of The Researchmentioning

confidence: 99%

Mathematical models of temperature in electric discharge rolling of metals

Albagachiev¹,

Keropyan²,

Gerasimova³

et al. 2021

cisisr

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The model of analytical calculation of the average volumetric temperature of plastic deformation in the conditions of applied impulse current was developed on the base of rolling energy balance. Additionally, the formula for determination of the contact temperature between rolls and strip as well as temperature gradient through strip thickness and its variation in time of electroplastic process conduction was concluded on the base of solution of the heat conductivity differential equation in Fourier partial derivatives. This equation is valid for the boundary condition taking into account joint heating with impulse current and plastic deformation. Conducted temperature calculations for dimensionless time in the deformation area during electric discharge rolling of steel 3 and VT-6 titanium alloy displayed that temperature rise up to its maximal value has temporal displacement to strip exit side of deformation area. It is connected with temporal retarding of heat forming comparing with the time of elastic-plastic deformation. As soon as the contact square of rolls with strip has two different areas, where bonding and slipping are realized via rolling friction and slipping friction, immediate temperatures will also differ respectively. The obtained models allow to conduct calculations of the contact temperatures in the areas of roll bonding and slipping relating to the rolling strip. Electric discharge rolling reduces conventional cold rolling technology via elimination of heating with intermediate heat treatment (annealing) and improves thereby thin strip quality via healing of its cracks and defects by electric impulses, as well as increases productivity by 30 %.

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