30.06.2018
12th issue of the journal "KB"
SECTION ROLLING PRODUCTION
DEVELOPMENT OF THE CONCEPTION OF MINI-MILLS AND MINI-PLANTS FACTORS FOR STEEL ROLLING PRODUCTION
G.K. Rozhkov, S.A. Levandovsky
Abstract. The article presents actual information of the condition of the world steel market and shows the reasons for the interest of manufacturers of metallurgical equipment and investors in the development of the conception of mini-mills (and mini-plants). The article also provides the necessary information for understanding the conception of mini-mills (and mini-plants) and presents the types of their classification. The article shows the advantages and disadvantages of mini-, micro- and nano-plants. The possibilities of further development of mini-plants in Russia and in the world are considered. Examples of already commissioned objects are given.
Keywords: mini plant, micro plant, nano-plant, world steel market, new standard, casting rolling unit (CRU), mini-mill, direct reduction iron (DRI).
Keywords: mini plant, micro plant, nano-plant, world steel market, new standard, casting rolling unit (CRU), mini-mill, direct reduction iron (DRI).
MODERNIZATION OF THROUGHT FURNACE FOR HEATING RAILS FOR TEMPERING
V.Y. Rubtsov, D.V. Gaev, S.V. Borisov
Abstract. Mode of heating of rails the RP65 for tempering in the rail-shop department of JSC «EVRAZ-NTMK» is considered. Two experiments were performed with a change of heating mode of billet. Temperature was uneven on rails, because speed of heating was increasing. A constructive solution is proposed. Frequency converters installing for each zone of the furnace, will provide different heating rates in the packages with rails, with an increase in the intensity of heating and ensuring the uniformity of the temperatures obtained at different points, thereby increasing productivity of the furnace.
Keywords: through furnace, mode of heating, rail, rollers, zone of heating, frequency converter, thermocouple, mode of speeds.
Keywords: through furnace, mode of heating, rail, rollers, zone of heating, frequency converter, thermocouple, mode of speeds.
Flat rolling production
STATEMENT OF THE PROBLEM TO SIMPLIFICATION OF CALCULATION THE ROLL DEFORMATION AND STRIP PROFILE IN A FOUR-HIGH STRIP MILL
M.I. Rumyantsev, A.N. Kolybanov
Abstract. The article formulated and posed the problem to simplification of calculation the roll deformation and strip profile in a four-high strip mill.
Keywords: deformation of rolls, strip profile, transverse thickness, modulus of rigidity, rolling force, four-high strip mill.
Keywords: deformation of rolls, strip profile, transverse thickness, modulus of rigidity, rolling force, four-high strip mill.
SIMPLIFICATION OF CALCULATION OF THE SHAFT DEFORMATION AND STRIP PROFILE FOR ROLLING IN A FOUR-HIGH STRIP MILL WITH THE APPLICATION OF THE METHODOLOGY PLANNING THE EXPERIMENT
A.N. Kolybanov
Abstract. The article describes the plan and results of a computer experiment on the basis of which nonlinear approximations were obtained for a simplified calculation of the lateral stiffness moduli of a roll knot of a four-high strip mill 2500 hot rolling.
Keywords: deformation of rolls, strip profile, transverse thickness, modulus of rigidity, rolling force, four-high strip mill.
Keywords: deformation of rolls, strip profile, transverse thickness, modulus of rigidity, rolling force, four-high strip mill.
SPECIAL SECTION ROLLING PRODUCTION
ROLL PASS DESIGN OF CROSS-HELICAL ROLLING OF PERIODIC PROFILES FORMED BY CURVES OF THE SECOND ORDER
V.Y. Rubtsov
Abstract. In work the review of existing today progress in development of cross-helical rolling of periodic profiles is submitted. The analysis of the existing methods of roll pass design and calculation forge in cross-helical rolling, and in cross-wedge rolling is carried out. The technique of roll pass design is developed for a periodic profile formed by semi-ellipsoid curves. The possibility development of roll pass design and production rolls, using for rolling with profiles formed by curves of the 2-nd order is considered.
Keywords: cross-helical rolling, periodic profile, curves of 2-nd order, roll pass design, pitch increment, undercutting of flange, curve equation.
Keywords: cross-helical rolling, periodic profile, curves of 2-nd order, roll pass design, pitch increment, undercutting of flange, curve equation.
Roll-formed section production
FORMING DIAGRAMS AND ROLL-PASSES IN ROLL-FORMING OF SECTIONS WITH MIDDLE RIGIDITY ELEMENTS
A.V. Filimonov, S.V. Filimonov
Abstract. There are discussed forming diagrams for roll-formed profiles with middle rigidity elements adopted in traditional roll-forming and in intensive deformation method. A manufacture technology based on the intensive deformation method for a symmetrical profile with middle double thickness rigidity elements is offered.
Keywords: roll-forming, roll-formed profile, middle rigidity element, number of passes, forming length zone, forming roll.
Keywords: roll-forming, roll-formed profile, middle rigidity element, number of passes, forming length zone, forming roll.
A METHOD OF CALCULATING THE CROSS-SECTIONAL DIMENSIONS OF A SHEET BLANK IN THE INTERMEDIATE STAGES OF THE ROLLER FORMING PROCESS
S.V. Povorov
Abstract. When designing passes for the production of shaped profiles from sheet blanks there is a need to draw the cross-section of the workpiece at the intermediate stages of forming. In this case, the cross-section dimensions are known for the final shape of the profile, and at the intermediate stages of forming the size values are not known, but they are determined by the method of forming, which was chosen by the engineer. Since the complexity of the geometric shape of the profile and the number of passes are often quite large, the actual question is the automation of the process of performing these calculations. One of the ways to automate the size calculation process is described in this article.
Keywords: roll forming, roll pass, system of linear algebraic equations.
Keywords: roll forming, roll pass, system of linear algebraic equations.