Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B11/00—Bell-type furnaces
• • 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
  • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
  • C21D9/54—Furnaces for treating strips or wire
  • C21D9/663—Bell-type furnaces
  • C21D9/667—Multi-station furnaces
  • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere

Definitions

• the invention relates to a high-temperature furnace for the annealing of metal coils with a Glühsockel, with a support device which forms a contact surface for coaxial receiving a metal collar at a distance above the Glühsockels, coaxially enclosing the Glühsockel with the support device, to a protective gas supply and a protective gas connected protective cover of a cylindrical shell and the cloak top closing dome, with a circumferential seal between the glow base and the guard and with a protective cover with distance enclosing heating hood.
• Steel transformer plates with a silicon content of 0.5-3.5% by weight are, for technological reasons, usually subjected to high-temperature treatment in a hood furnace.
• a protective gas in particular nitrogen and / or hydrogen until heated to 1200 0 C, namely substantially by radiant heat.
• the inherent strength of the annealed material decreases sharply, so that the metal coils, which consist of reeled steel bands, are each supported on a supporting device, the load-bearing resting on an incandescent base or the glow base resting on a foundation.
• a disadvantage of the known high-temperature furnaces of this kind is especially that when annealing of a single sheet metal of the above the Glühsockel on the support device centrally supported metal collar in its lower area is heated significantly lower than in its upper area. As a result, the annealing process must be extended to achieve the magnetic properties of the sheet over the entire waist height.
• the heating of the upper collar and the upper collar is much faster than that of the lower collar, which thus does not reach the desired end temperature and thus affected accordingly has magnetic properties.
• the heat-insulating structure of the base made of refractory concrete slabs brings little improvement in this regard.
• the protective seal is sealed by means of a sand bed which receives the lower edge of the protective cover so that the protective gas escapes through the sand bed into the heating hood and is withdrawn therefrom.
• the invention is therefore based on the object, a high-temperature furnace of the type described for the annealing of Blechbunden so that the annealed material can be heated uniformly in a protective gas atmosphere to high treatment temperatures to a beneficial, uniform annealing of metal coils for transformer sheet steel with a Silicon content up to 3.5 wt.% Guaranteed to be able.
• the invention solves the problem set by the fact that the determined by the vertical distance of the contact surface of the support device from the glow base, axial shell portion of the guard has a surface that makes up at least three quarters of the dome area.
• the invention is based on the recognition that radiant heat is additionally added to the annealed material in the upper region of the protective hood via its dome. is performed so that when protective hoods for the annealing of a single sheet metal collar of the metal collar is heated faster in its upper region than in the lower region. In the annealing treatment of two or more coaxially stacked on the support plate provided Blechbunden the upper or top is acted upon by a larger amount of radiant heat.
• the protective cover is extended, so that between the glow base and the contact surface of the support device for the (lower) Blechbund by the extended in this area coat the guard an additional radiation surface is obtained, which corresponds to at least three quarters of the dome area so that a sufficient amount of heat can be supplied to the annealing material in the lower region of the protective hood in order to at least partially compensate for the heat supply in the upper region of the protective hood. Due to this measure, it is thus possible to ensure a largely uniform heating of the annealing stock to the treatment temperature.
• the surface of the protective jacket corresponding to the vertical distance of the contact surface from the incandescent base must correspond at least to the dome surface.
• heat losses due to heat dissipation via the glow socket are not yet taken into account.
• An increase of 5 to 20% is generally sufficient to cover the heat losses through the glow base.
• the glow base can be constructed of mineral wool, which has a significantly higher thermal insulation value compared to conventional refractory concrete slabs.
• the carrying device penetrates the mineral wool made of mineral wool. base and is based on load transfer at the furnace foundation.
• the height of the built-up of mineral wool annealing base should correspond to at least a third, preferably half, of the diameter of the guard.
• the guard can apply the guard through the heating hood with a decreasing heating power, so that due to the higher heat input in the lower part of the guard for improved heating the Glühguts can be taken care of.
• heating mantles with an electric heater can be provided for this purpose the height of each other separate, each controllable sections of the heater.
• the burners can preferably be arranged in the region between the glow base and the contact surface of the carrying device for the annealed material provided above the glow base.
• Show it 1 shows a high-temperature furnace according to the invention with a gas-heated heating hood in a schematic longitudinal section and
• Fig. 2 is a similar to Fig. 1 representation of a high temperature furnace according to the invention with an electrically heated heating hood.
• the high-temperature furnace according to FIGS. 1 and 2 has a furnace foundation 1 with an annealing base 2, which is penetrated by a supporting device 3 supported on the furnace foundation 1 for the annealed material.
• the support device 3 is designed according to the two embodiments for receiving two metal coils 4, which are mounted one above the other on support disks 5.
• the jacket 7 is closed gas-tight with the aid of a Aufsetzflansches 8 and a ring seal 9 against the furnace foundation 1 and the glow base 2.
• the protective gas usually nitrogen and / or hydrogen, is supplied via a protective gas supply line 10, which has distributed over the circumference of the protective cover 6 outlet openings 11, so that the protective gas flows between the jacket 7 and the base 2 along the jacket 7 in the protective cover 6 and can be withdrawn centrally via an exhaust pipe 12 passing through the glow base 2.
• the heating of the annealing is carried out via an attached heating hood 13, the distributed according to FIG. 1 over the circumference of the burner 14 and according to FIG. 2, an electric heater each having individually controllable heating sections 15.
• the annealed material is thus heated by the respective heating device of the heating hood 13, essentially by radiant heat radiating from the protective hood 6.
• the protective hood 6 offers not only with its jacket 7, but also with its dome 16 radiation surfaces, so that in the area of the upper metal collar 4, the Bunder noirrmung also on the dome area.
• the jacket 7 is in the area extended between the glow base 2 and the contact surface 17 of the support device 3 for the lower flange 4.
• the arrangement is made such that the height distance h of the contact surface 17 of the supporting device 3 from the glow base 2 determines a jacket portion of the protective hood 6, which has a corresponding surface at least three quarters of the coupling surface, preferably the entire dome surface.
• this lateral surface section can be 5 to 20% larger than the dome surface.
• an incandescent base 2 made of mineral wool is not suitable for removing the loads caused by the annealed material on the furnace foundation 1, so that the support device 3 for the metal coils 4 is supported on the furnace foundation 1 by itself.
• the protective cover 6 can be acted upon by the height with different heating powers.
• the burners 14 for the gas heating in FIG. 1 are arranged below the contact surface 17 for the lower sheet metal collar 4.
• the individual sections 15 of the electric heating device can be activated, so that different heating outputs, for example, can be ensured by switching off or de-energizing individual sections, as required.
• the high-temperature furnace could also only be used to heat an individual metal collar 4 or more than two metal coils 4. lays down.
• the selected depending on the dome area height distance h of the contact surface 17 of the support device 3 from the base 2 prevents uneven heating of this collar 4 the amount.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Crystallography & Structural Chemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Furnace Details (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Heat Treatment Of Articles (AREA)
• Manufacturing Of Steel Electrode Plates (AREA)
• Muffle Furnaces And Rotary Kilns (AREA)
• Tunnel Furnaces (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2009
  • 2009-03-13 AT AT0040509A patent/AT507671B1/de not_active IP Right Cessation
• 2010
  • 2010-03-03 RU RU2011141411/02A patent/RU2502028C2/ru not_active IP Right Cessation
  • 2010-03-03 BR BRPI1009103A patent/BRPI1009103A2/pt not_active IP Right Cessation
  • 2010-03-03 JP JP2011553230A patent/JP2012520390A/ja not_active Withdrawn
  • 2010-03-03 CN CN201080016390.1A patent/CN102395852B/zh not_active Expired - Fee Related
  • 2010-03-03 KR KR1020117020951A patent/KR20110135934A/ko not_active Application Discontinuation
  • 2010-03-03 MX MX2011009546A patent/MX2011009546A/es not_active Application Discontinuation
  • 2010-03-03 CA CA2755138A patent/CA2755138A1/en not_active Abandoned
  • 2010-03-03 US US13/138,616 patent/US20120018931A1/en not_active Abandoned
  • 2010-03-03 UA UAA201111674A patent/UA102593C2/ru unknown
  • 2010-03-03 EP EP10710150A patent/EP2406569A1/de not_active Withdrawn
  • 2010-03-03 WO PCT/AT2010/000060 patent/WO2010102313A1/de active Application Filing
  • 2010-03-10 TW TW099106856A patent/TW201040287A/zh unknown
• 2011
  • 2011-09-05 ZA ZA2011/06475A patent/ZA201106475B/en unknown

Non-Patent Citations (1)

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