Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
  • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
  • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
  • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/84—Controlled slow cooling
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
  • C21D9/06—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails with diminished tendency to become wavy
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B2045/0221—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for structural sections, e.g. H-beams

Definitions

• the invention relates to a method for cooling shaped steel, in particular section steel beams from the rolling heat.
• the cooling of shaped steel, such as section steel beams, eg double T and U profiles, angles, T steels, after the rolling is usually done with the help of a cooling bed. Because of the uncontrolled, often unfavorable, free cooling of the section steel beams or bars during the dwell time on the cooling bed, an adverse influence on the straightness and the internal stress state is inevitable. The straightness or the natural shape is causally closely related to the residual stress state. Taken together, these two quality criteria mentioned for the section steel beams can be compared with the flatness of the strip rolling.
• the invention is based on the following considerations and knowledge relating to the mechanism of the generation of residual stresses.
• a rolled section steel beam leaves the last rolling stand in good approximation with a homogeneous distribution of strain, which means that the beam or rod is straight and has no areas with waviness.
• the rod / support is also almost free of residual stress due to the high temperature level.
• the rolling rod takes on a shape due to the distortion that occurs, in which the internal moment becomes zero, unless external forces - e.g. Weight, friction or other holding forces, for example due to a straightening grate - prevent it.
• external forces e.g. Weight, friction or other holding forces, for example due to a straightening grate - prevent it.
• the invention has for its object to provide a method which enables a profile steel having a uniform temperature distribution towards the end of the conversion.
• a final air cooling is preceded by a targeted water cooling in such a way that shaped steel areas having material accumulations are cooled on the outside of the profile with a variable exposure width and duration subject to a computer-aided predetermined cooling strategy, down to a value which is at least just above the conversion temperature Arl will.
• the areas on the outside of the profile are, for example, the flanges for double T and U profiles.
• the appropriate temperature distribution is preferably set by rows of spray nozzles arranged one behind the other in the rolling direction, which, depending on the requirements, can also be arranged several times next to one another and possibly nested, with different spacings in the longitudinal direction or as different nozzles which act on the profile at the desired points or areas.
• the temperature of the shaped steel is determined in order to determine the exposure width and duration as well as the intensity necessary for the cooling strategy and is entered into the process computer.
• the temperature distribution in the profile is determined at the beginning of the cooling process or in the case of continuous systems before the profile enters the cooling section. This determination can be achieved either by measuring the temperatures of different profile areas, by measuring a reference temperature and drawing conclusions about a characteristic distribution, by calculation taking into account the forming history, or as a combination of these methods.
• the suitable cooling strategy is then determined with the help of the process computer, the cooling process automatically in due time activated, if necessary changes in speed or temperature changes over the length and finally ended.
• the calculation of the suitable cooling strategy can either be achieved on-line using software based on a physical model, or calculation results can be determined in advance depending on the profile type, assumed temperature distributions and material off-line, implemented in the computer and the cooling intensity and duration be determined interpolatively.
• a water cooling section following the last rolling mill necessary for the rolling of the shaped steel is preferably subdivided into individually controllable and switchable or switchable cooling zones, an adaptation to different profiles, temperature situations, materials and speeds of the outgoing can be carried out in a simple manner Reach shape steel.
• the cooling section can consist of several cooling section sections. A sufficient number of individually controllable zones also enables the process to be controlled in the event of changing conditions, such as the throughput speed or the output temperature distribution, and also a standstill, e.g. of the rod end within the cooling section can then be controlled.
• the size of the water-pressurized steel surface be changed by changing the distance from the cooling water nozzles to the profile outside and, according to a further proposal of the invention, the cooling intensity is controlled by changes in the supply pressure.
• the manifolds it is advisable to equip the manifolds with several rows of nozzles instead of just one row of nozzles on each side, which contributes to widening the exposure area and grading the cooling intensity.
• the position or the course of the cooled web defined by the impinging water jets on the shaped steel can be adjusted by means of a corresponding device via rotatable rows of nozzles.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Physics & Mathematics (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Metal Rolling (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Control Of Metal Rolling (AREA)
• Control Of Heat Treatment Processes (AREA)

Applications Claiming Priority (2)

Publications (1)

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Cited By (1)

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Citations (8)

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• 1997
  • 1997-04-25 EP EP97106855A patent/EP0807692A1/de not_active Withdrawn
  • 1997-05-09 US US08/853,615 patent/US6059903A/en not_active Expired - Fee Related
  • 1997-05-10 KR KR1019970018047A patent/KR970073769A/ko not_active Application Discontinuation
  • 1997-05-14 JP JP9124500A patent/JPH1071415A/ja not_active Withdrawn
  • 1997-05-15 CN CN97111199A patent/CN1171307A/zh active Pending

Patent Citations (8)

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