Abstract
An analysis of the helical rolling process shows that the change in the axial speed of the roll along the length of the groove of the cross-roller mill does not correspond to the required nature of the change in the speed of the deformed billet. The process proceeds under intense axial compression, as a result of which a significant part of the metal being compressed in the contact zone is displaced into the inter-roll zone. The direction of the axial force in the corresponding zone of the roll groove is shown to depend on the inclination angle of the generatrix of the considered section of the roll to the rolling axis. A modernization of the helical rolling technology, which makes it possible to deform the billet under the effect of intralesional axial tension, is proposed. The set problem is accomplished by applying the calibration of the rolls, at which the ridge section of the roll, on which the axial force is directed against the direction of rolling, is located at the beginning while the pulling section, on which the direction of the axial force coincides with the direction of rolling, is located behind it. This scheme of action of axial forces in the zone of intensive compression of the billet creates the most favorable conditions for the flow of metal in the axial direction. A technical solution for the implementation of the stage of gripping the billet by rolls is proposed, and a description of this stage and the stationary phase of the process is provided. The fundamental change in the deformation conditions of the billet due to the modernization makes it possible to reduce the force load on the operating rolls, increase their performance, and reduce energy costs during rolling. This will ensure the rolling of a solid billet in a swaging mill with a higher drawing, will create the prerequisites for expanding the size and grade range when producing bars in radial shear rolling mills. When producing pipes in rolling lines with an Assel mill, the range of finished products can be also significantly expanded due to the production of thin-walled high-precision pipes.
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Translated by A. Ivanov
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Rotenberg, Z.Y., Budnikov, A.S. Modernization of Helical Rolling Technology in a Multi-Roll Mill. Steel Transl. 52, 11–16 (2022). https://doi.org/10.3103/S096709122201020X
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DOI: https://doi.org/10.3103/S096709122201020X