PRELIMINARY ASSESSMENT OF THE POSSIBILITY OF DOUBLE-STRAND ROLLING AND SEPARATION OF REBAR WITH A DIAMETER OF 22 MM ON A 400/200 OF PJSC KAMET-STAL»

This paper presents proposals for the implementation of a new rolling-separation technology at Mill 400/200 of PJSC “KAMET-STAL” based on the results of mathematical modeling in the finite element program QForm. As part of this work, it is proposed to introduce a new variant of the rolling-splitting technology for rebar with a diameter of 22 mm. According to the proposal, rolled products in stands from 3H to 18H are manufactured in calibers and with settings that correspond to the calibration table for rolling rebars with a nominal diameter of 20 mm. According to this scheme, a double profile is formed in the 17H stand for cutting, and in the 18H stand, the billet is cut longitudinally into two halves with a diameter of 31 mm each. Further along the rolling process, an oval caliber of factory marking 8336 is installed in stand 19H to produce rebars with a nominal diameter of 22 mm (according to the current calibration table for rebars with a nominal diameter of 22 mm, the caliber of stand 15H). Rolls with a round caliber 8345 are installed in the 20H stand (according to the current calibration table for rebars with a nominal diameter of 22 mm – the caliber ofstand 16H). The final production of rebar with a nominal diameter of 22 mm is carried out in two passes in a high-speed 200/4 slitting line. To check the technical feasibility of rolling-separation of rebar profile with a nominal diameter of 22 mm according to the new scheme, the calculation of the deformed state of continuous rolling in the environment for modeling volumetric deformation problems of QForm UK version 10.2.1 was carried out. The model has a number of technical simplifications: all the equipment of the technological line is not taken into account and the distance between the stands is reduced. Simplifications do not reduce the accuracy of the calculation results. Calculations of the deformed state during hot rolling of steel rebar profile with a nominal diameter of 22 mm after separation were performed. The simulation results confirm the possibility of implementing the developed new production technology of rebar profile with a nominal diameter of 22 mm. Calculations showed that the new technology will make it possible to increase the state's productivity during the production of rebar profile with a nominal diameter of 22 mm by 28...29% compared to single thread rolling.