EP0714452B1 - Verfahren und vorrichtung zum wärmebehandeln von glühgut in einem haubenglühofen - Google Patents

Verfahren und vorrichtung zum wärmebehandeln von glühgut in einem haubenglühofen Download PDF

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Publication number
EP0714452B1
EP0714452B1 EP94926826A EP94926826A EP0714452B1 EP 0714452 B1 EP0714452 B1 EP 0714452B1 EP 94926826 A EP94926826 A EP 94926826A EP 94926826 A EP94926826 A EP 94926826A EP 0714452 B1 EP0714452 B1 EP 0714452B1
Authority
EP
European Patent Office
Prior art keywords
gas
hood
nozzle
annealing
furnace
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94926826A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0714452A1 (de
Inventor
Georg Velten
Friedhelm Kühn
Walter Scheuermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOI Thermprocess GmbH
Original Assignee
LOI Thermprocess GmbH
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Filing date
Publication date
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Application filed by LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Publication of EP0714452A1 publication Critical patent/EP0714452A1/de
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Classifications

    • 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
    • C21D9/673—Details, accessories, or equipment peculiar to 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
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof

Definitions

  • the invention relates to a method for the heat treatment of annealing material in a bell annealer, in which there is a blower, with fresh gas in the bottom of the oven blown in and the gas mixture that forms with the gas present in the furnace, is discharged from the bottom of the oven.
  • the invention further relates to a bell annealer to carry out this procedure, with a base, one on the base! arranged Annealing material plate for carrying the annealing material, one below a central opening the glow ember plate arranged blower, one the annealing material and the annealing material plate with a surrounding hood and at least one each arranged on the base Gas inlet and gas outlet, the gas inlet leading in an upward direction Flow path opens.
  • US-A-4,596,526 describes a generic hood furnace and a method for process rinsing during the heat treatment.
  • heat exchange gas with a volume flow of approx. 21.2 m 3 / h is continuously supplied and removed.
  • the gas input during the cooling phase is approx. 14 m 3 / h.
  • the gas is discharged before and after the heat treatment.
  • the gas inlet is designed as a tube which opens into an upward flow path. The speed of the heat exchange gas does not matter. An exchange of the atmosphere before and after the heat treatment is not disclosed.
  • Bell annealers are used in particular for the heat treatment of sheet metal Coils are wrapped.
  • the latter are stacked on top of each other on the annealing plate, with its central "eye" a channel in continuation of the central opening of the annealing plate forms.
  • the fan After putting the hood on a fresh batch, put it in the oven exchanged air for protective gas. Then the annealing treatment begins, the fan sucks the gas centrally from top to bottom and laterally into the Promotes annulus between the annealing material and the hood.
  • the gas input during the exchange of the atmosphere during pre-, emergency and post-rinsing is very considerable.
  • the volume flow is 100 to 180 m 3 / h, and normally for a period of 20 to 40 minutes.
  • this requires the full functionality of the blower. If the blower fails, the rinsing time is approx. 24 hours. This loss of operating time is of great importance. There is also a not inconsiderable gas consumption.
  • the invention has for its object to remedy this situation and a more economical, above all to enable faster exchange of the atmosphere.
  • the number 22.4 is known to be the volume (in l) that a mole of a gas occupies and therefore has the unit l / mol.
  • the inventive device according to claim 3 is characterized in that the gas inlet as upward directed nozzle in the form of a smooth jet nozzle of constant diameter or is designed as a nozzle with constrictions, the nozzle exit surface being approx. Is 10% of the area of the gas outlet.
  • the invention is based on the knowledge that the speed of the entering Beam significantly influences the exchange process and for the optimization of the speed the density of the gas to be flushed out and the Density of the fresh gas must be taken into account, namely according to the relationship above.
  • the success of the invention should be attributed to this be that in the upward flow path blown high speed beam at appropriate mutual coordination of speed and channel dimensions for an extremely quick and even mixture formation leads.
  • the jet enters the gas to be exchanged and at the same time causes a suction effect.
  • the The beam is effective far into the dome of the hood. This Effects may increased by the pulsation of the beam become.
  • the beam guidance prevents it from starting is located at the level of the annealing plate, effectively Short circuit flow to the gas outlet.
  • the high-speed jet can pass through the central opening through the glow plate in the "eyes" of the coils formed central channel can be set up. It offers it is appropriate to make the shaft of the blower hollow and, if necessary with the appropriate extension, to be used as a nozzle.
  • the ratio of the distance between the center of the nozzle and the hood to the nozzle outlet diameter is between 2.5 and 8. If, for example, it is a question of exchanging H 2 for N 2 , the ratio is preferably> 7.5.
  • the nozzle advantageously opens at the level of the annealing material plate, where the nozzle mouth is a flow length with constant Diameter is upstream, which is about 5 times the nozzle outlet diameter corresponds. It was found that on very favorable flow conditions can be achieved in this way can.
  • the gas outlet is preferably in the annular space between the annealing material and the hood diametrically opposite the nozzle arranged. If several gas outlets and nozzles are provided, then so these are each arranged on a common sector, with the sectors facing each other. In any case a flow is forced, which is essentially large the hood contour follows.
  • the gas outlet is from one associated with the blower Baffle shielded so that he above all the flow close to the hood, with transverse, short-circuit-like Currents are largely rejected.
  • the invention is based on a preferred Embodiment in connection with the accompanying Drawing explained in more detail.
  • the drawing shows a schematic Vertical section through a bell annealer according to the invention.
  • the bell annealer has a base 1 with an annealing plate 2 on.
  • the latter carries coils 3 stacked one above the other, in the present case four in number. Their "eyes" forming a central channel 4, which is connected to a central opening 5 of the Glow ember plate 2 connects.
  • a blower 6 operates below the central opening 5 a blower 6.
  • the coils 3 and the annealing plate 2 are covered by a hood 8 to form an annular space 7.
  • the bell annealer has a gas inlet in the form of an upwardly directed nozzle 9 which opens into the annular space 7. It generates a pulsed, upward-directed high-speed jet, the speed of which is 75 m / s, at a volume flow of 130 m 3 / h. It is a smooth jet nozzle with a diameter of 25 mm, the nozzle opening at the level of the annealing material plate 2. The ratio of the distance between the center of the nozzle and the hood to the nozzle diameter is 5.
  • a gas outlet 10 is provided, the diameter Is 80 mm.
  • the gas outlet is assigned to the blower 6 Baffle 11 shielded.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)
EP94926826A 1993-08-19 1994-08-06 Verfahren und vorrichtung zum wärmebehandeln von glühgut in einem haubenglühofen Expired - Lifetime EP0714452B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4327975A DE4327975A1 (de) 1993-08-19 1993-08-19 Verfahren und Vorrichtung zum Austauschen der Atmosphäre in einem Haubenglühofen
DE4327975 1993-08-19
PCT/EP1994/002619 WO1995005487A1 (de) 1993-08-19 1994-08-06 Verfahren und vorrichtung zum austauschen der atmosphäre in einem haubenglühofen

Publications (2)

Publication Number Publication Date
EP0714452A1 EP0714452A1 (de) 1996-06-05
EP0714452B1 true EP0714452B1 (de) 1999-01-13

Family

ID=6495599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94926826A Expired - Lifetime EP0714452B1 (de) 1993-08-19 1994-08-06 Verfahren und vorrichtung zum wärmebehandeln von glühgut in einem haubenglühofen

Country Status (7)

Country Link
US (1) US5730930A (ru)
EP (1) EP0714452B1 (ru)
CN (1) CN1043058C (ru)
AT (1) ATE175725T1 (ru)
DE (2) DE4327975A1 (ru)
RU (1) RU2127325C1 (ru)
WO (1) WO1995005487A1 (ru)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20113882U1 (de) 2001-08-22 2002-01-24 Drever International S.A., Liègè Vorrichtung zum Temperieren eines Werkstoffes
AT411904B (de) 2003-03-24 2004-07-26 Ebner Ind Ofenbau Haubenglühofen, insbesondere für stahlband- oder drahtbunde
US20090065108A1 (en) * 2006-02-06 2009-03-12 Hyradix, Inc Integrated Reformer and Batch Annealing Processes and Apparatus Therefor
AT505663B1 (de) * 2007-10-11 2009-03-15 Ebner Ind Ofenbau Haubenglühofen zur wärmebehandlung von glühgutbunden
AT507423B1 (de) * 2009-03-25 2010-05-15 Ebner Ind Ofenbau Verfahren zum vorwärmen von glühgut in einer haubenglühanlage
RU2458154C1 (ru) * 2011-03-14 2012-08-10 Открытое акционерное общество "Магнитогорский металлургический комбинат" Способ отжига низкоуглеродистой стали, прокатанной на текстурированных валках
CN106424195A (zh) * 2016-12-01 2017-02-22 浙江东南金属薄板有限公司 一种冷轧带钢的生产加工工艺
CN110394117B (zh) * 2019-08-29 2024-06-21 海盐盛信标准件股份有限公司 一种高强度螺栓的退火气氛混合装置

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2998236A (en) * 1956-07-16 1961-08-29 Cramer Hans Method of annealing in bell furnaces
GB878500A (en) * 1957-02-13 1961-10-04 Lee Wilson Apparatus for annealing strip metals
DE1145988B (de) * 1959-01-16 1963-03-21 Iawistraiaofenbau Ges M B H Ofenanlage zum Brennen von mit brennbaren Fuellstoffen versetztem keramischem Gut
FR1388102A (fr) * 1963-12-28 1965-02-05 Armco Steel Corp Décarburation des bobinages d'acier
BE679856A (ru) * 1965-05-06 1966-10-03
US3540710A (en) * 1967-12-14 1970-11-17 Tokyo Gas Co Ltd Gas annealing furnace
US3554511A (en) * 1969-01-13 1971-01-12 Bethlehem Steel Corp E furnace
GB1390238A (en) * 1972-04-06 1975-04-09 Wellman Incandescent Furn Co Coil annealing furnaces
DE8023715U1 (de) * 1980-09-05 1980-11-27 Btf-Edelstahlverarbeitung Gmbh & Co Kg, 5928 Laasphe Gasleituntersatz fuer gluehoefen
US4502671A (en) * 1982-10-30 1985-03-05 Nippon Steel Corporation Batch annealing apparatus
US4596526A (en) * 1985-03-04 1986-06-24 Worthington Industries, Inc. Batch coil annealing furnace and method
US4696526A (en) * 1985-07-26 1987-09-29 Intel Corporation Carrier for tape automated bonded semiconductor device
US4846675A (en) * 1987-06-01 1989-07-11 Worthington Industries, Inc. Annealing furnace
DE3720251C1 (en) * 1987-06-19 1988-03-24 H-Peter Prof Charles Method for cleaning the off-gases from the annealing chamber (carburizing chamber, case-hardening chamber) of annealing installations in the steel industry
US4867675A (en) * 1988-06-15 1989-09-19 Blackman Calvin C Method and apparatus for quickly purging atmosphere gas from bell furnace
SU1723427A1 (ru) * 1990-07-10 1992-03-30 Новолипецкий металлургический комбинат им.Ю.В.Андропова Колпакова печь дл отжига металла в рулонах
US5112030A (en) * 1990-10-01 1992-05-12 Daidousanso Co., Ltd. Heat treat furnace for fluorinating steel material
US5380378A (en) * 1993-04-23 1995-01-10 Gas Research Institute Method and apparatus for batch coil annealing metal strip

Also Published As

Publication number Publication date
RU2127325C1 (ru) 1999-03-10
EP0714452A1 (de) 1996-06-05
CN1138352A (zh) 1996-12-18
DE59407661D1 (de) 1999-02-25
US5730930A (en) 1998-03-24
CN1043058C (zh) 1999-04-21
DE4327975A1 (de) 1995-02-23
WO1995005487A1 (de) 1995-02-23
ATE175725T1 (de) 1999-01-15

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