PROJECT INNOVATION
A new technology and equipment has been developed to produce an isotropic hot rolled sheet with a high level of mechanical characteristics in the transverse direction.
The new production technology is based on the use of Thermo-plastic processing (TPO) by alternating elastic-plastic bending in a planetary-type deforming machine in the temperature range of BTMO and HTMO to form a set of mechanical characteristics in a direction different from the direction of rolling.
A distinctive feature of TPO from traditional methods of thermomechanical processing (TMT) is that the accumulation of a given value of the degree of deformation occurs without changing the original sheet thickness. To reduce the anisotropy of the mechanical characteristics of the sheet, alternately sign alternating bending in the longitudinal and transverse directions, alternating bends in the transverse direction with smoothing.
The technical result of the invention is to increase the complex mechanical characteristics of the coiled strip with a thickness of less than 20 mm, reducing anisotropy and increasing the flatness of the rolled strip in the production process in the combined casting and rolling units direct casting.
Fig 1. Scheme of the technological line of the combined casting and rolling unit for direct rolling of the strip
Fig 2.Scheme of the technological line of the combined casting and rolling unit during the casting of a strip billet with a thickness of less than 10 mm, obtained by the molding roller machine
1 – strip; 2 – thin slab casting machine; 3 – thin slab; 4.7 – continuous heating furnaces; 5 – rough rolling line; 6,9,12 – multival planetary machines; 8.15 – winders; 10 – finishing rolling line; 11.13 – accelerated cooling lines; 14 – scissors.
Fig 3. Multi-roll deforming machine of a planetary type in a section
1 – strip; 16 – work rolls; 17 – input and output pairs of rolls; 18,19 – separators.
COMPETITIVE ADVANTAGES OF TECHNOLOGY
Allows you to increase the mechanical characteristics of flat rolled products in directions other than rolling, including the cross, without changing the thickness of the rolled.
Allows 12 -: – 15% increase the complex mechanical properties of flat rolled products in the transverse direction, especially structurally sensitive (impact strength at -40 ° C).
Allows you to get an isotropic sheet preventing the appearance of festoons in the subsequent deep drawing.
Allows you to fully work out the original cast structure of a continuous-cast flat billet with thicknesses of 4 -: – 12 mm and remove its initial warpage after a two-roll caster before rolling.
The structure of the equipment allows to fit into the existing technological lines of casting and rolling complexes.
Technological equipment for plastic processing (deforming machine of a planetary type) allows changing the size and direction of plastic processing in a wide range, regardless of the speed of the rolled steel in the casting-rolling unit.
