18th issue of the journal "KB"

Abstract. The efforts for actualizing a breakthrough in technology and rising the level of the sustainability of manufacturing systems via implementation of I4 and I5 have given significant impetus to the concept of the Digital Twins. In the context of the rolling industry, a propitious version of a Digital Twin is a replica of the calibration (roll pass design). The calibration is an embodiment of the instructions for the realisation of the rolling process, including design, monitoring, control and maintenance. An aspect of fundamental importance in the calibration and in the design of digital twins is the mathematical definition of the geometry of the deformation zone and, in particular, digitizing the incoming and exiting contours of the rolled solids. The proposed method for digitizing the pass morphometry opens the gate for mobilizing the existing computing potentials and analytic theories for improving the sustainability of rolling systems.
Keywords: calibration (roll pass design), calibre, groove, deformation zone, digital twin, Chebyshev polynomials.

Abstract. At the EVRAZ NTMK JSC in wide-flange beams rolling shop, the technology of rolling various diameters round billets into square billets one was mastered, which made it possible to reduce shop's illiquid products remains. The technology is based on use of alternate of universal and two-roll calibers, which allows stable rolled products production. Also, billet obtained by this method has a number of advantages in its macrostructure terms.
Keywords: round billet, square billet, wide-flange beams rolling shop, rolling pattern, coefficient of elongation, metal macrostructure.

Abstract. The article analyzes the possibility of reducing the vanadium content in pipe steels of strength class K60 based on the development of compensating technological operations.
Keywords: thick plate, rolled pipe, alloying, mechanical properties, vanadium.

Abstract. The article presents the results of calculations of the basic geometric parameters of cutting a ball-rolling roll on a screw-gauge lathe equipped with a copier with a continuously changing step. Calibration calculation is performed for a ball-rolling roll with two-start screw calibres with an offset center of the grooves for rolling grinding balls with a diameter of 70 mm.
Keywords: grinding balls, screw calibre, ball-rolling roll, flange, cam copier, MathCAD 15.