Innovative crushing technique and vertical roll crusher design

Basyrov, I. I.; Bardovsky, A. D.

doi:10.25018/0236-1493-2020-2-0-121-129

Cited by 11 publications

(1 citation statement)

References 5 publications

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“…Rolling of hard-to-deform metals is conducted with passing of impulse electric current of high density, and the following effects are observed in the rolling metal: temperature rise, pinch effect, skin effect etc. Despite of systematic researches that have been taken place in this direction for many decades, the common opinion about the effect of impulse current on the mechanisms of variation of temperature as well as parameters of strength and ductility of metals, creep and relaxation of mechanical stresses is absent [1][2][3][4][5][6]. Some researchers think that electroplastic effect is not connected with heating, but it is stipulated by direct influence of conductivity electrons on dislocations and other defects of crystal lattice and thereby provides prevailing influence on the processes in metal.…”

Section: Introductionmentioning

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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