Method for rolling ultrathin foil through multi-roll mill under auxiliary of pulse currents

Abstract

The invention belongs to the technical field of ultrathin strip rolling, and particularly relates to a method for obtaining foil which is smaller in thickness, higher in size precision, more stable inperformance and smaller in grain size by applying pulse currents in the process that the ultrathin foil is rolled with a multi-roll mill. Equipment used in the method comprises the multi-roll mill, an electric brush and a pulse power supply. Sialon ceramic rolls are adopted as an upper working roll and a lower working roll of the multi-roll mill, the insulating problem of the mill equipment can be solved through the mill rolls, the condition that heat energy is generated when the pulse currents pass through the mill rolls is avoided, wear of the mill rolls is reduced, and electric energy is saved. The pulse currents output by the pulse power supply form a closed circuit through the electric brush and an ultrathin strip, and electroplastic rolling is achieved. By adding the pulse currentsin the multi-roll rolling process of the ultrathin strip, the plastic deformation capability of the ultrathin strip is improved, crack propagation is inhibited, the ultrathin strip with the bright surface is rolled, the production efficiency is improved, and the ultrathin strip which is smaller in thickness, higher in size precision, more stable in performance and smaller in grain size is obtained.

Description

technical field [0001] The invention belongs to the technical field of ultra-thin foil rolling, and specifically relates to a method of applying pulse current in the process of rolling ultra-thin foil with a multi-roll mill, so as to obtain thinner thickness, higher dimensional accuracy, more stable performance, crystal Foil method with finer particle size. Background technique [0002] In the ultra-thin foil rolling process, when the thickness of the rolled piece decreases to a certain extent, the thickness of the rolled piece does not decrease significantly even if the rolling force continues to increase, and the minimum rollable thickness is reached at this time. In order to obtain an ultra-thin foil strip with a smaller thickness, a multi-roll mill with a smaller diameter of the work roll is usually used for rolling. The experimental research on the minimum rollable thickness shows that when the ultra-thin foil strip reaches the minimum rollable thickness, it usually ne...

AI Technical Summary

Problems solved by technology

There are two reasons why it is difficult to apply to multi-roll mills: on the one hand, the insulation of rolling mill equipment is relatively difficult, and it is difficult to achieve insulation in multi-roll mills; It has a great influence on the stiffness and service life of the multi-roll mill, and it will lead to increased wear of the multi-roll mill

The multi-roll mill is mainly used to produce precision strip steel, and the quality of precision strip steel has very strict requirements on the roll shape, which will inevitably increase the frequency of roll changing and repairing, and increase production costs

[0004] It has not been found that electroplastic rolling technology is applied to the process of rolling ultra-thin foil in multi-roll mills

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