EP0714452A1 - Procede et dispositif de traitement thermique dans un four a recuire a cloche - Google Patents

Procede et dispositif de traitement thermique dans un four a recuire a cloche

Info

Publication number
EP0714452A1
EP0714452A1 EP94926826A EP94926826A EP0714452A1 EP 0714452 A1 EP0714452 A1 EP 0714452A1 EP 94926826 A EP94926826 A EP 94926826A EP 94926826 A EP94926826 A EP 94926826A EP 0714452 A1 EP0714452 A1 EP 0714452A1
Authority
EP
European Patent Office
Prior art keywords
gas
nozzle
hood
annealing
annealing material
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.)
Granted
Application number
EP94926826A
Other languages
German (de)
English (en)
Other versions
EP0714452B1 (fr
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6495599&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0714452(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Publication of EP0714452A1 publication Critical patent/EP0714452A1/fr
Application granted granted Critical
Publication of EP0714452B1 publication Critical patent/EP0714452B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 exchanging the atmosphere in a bell annealer, the fresh gas being blown into the bottom of the furnace and the gas mixture being formed being removed from the bottom of the furnace.
  • the invention further relates to a bell annealer for carrying out this method, with a base, an annealing material plate arranged on the base for carrying the annealing material, a blower arranged below a central opening of the annealing material plate, a hood surrounding the annealing material and the annealing material plate at a distance, and at least in each case a gas inlet and gas outlet arranged on the base.
  • Hood annealing furnaces are used in particular for the heat treatment of sheets that are wound into coils.
  • the latter are stacked one above the other on the annealing material plate, with its central "eye" forming a channel in the continuation of the central opening of the annealing material plate.
  • the air in the furnace is exchanged for protective gas.
  • the annealing treatment then begins, the fan sucking the gas centrally from top to bottom and conveying it laterally into the annular space between the annealing material and the hood.
  • At least one exchange of the atmosphere of the bell annealing furnace is therefore required for each batch. If you work with hydrogen, these processes multiply. The air must be expelled from the oven before heating up. This is done by blowing in nitrogen. The filling with hydrogen then takes place, the nitrogen being expelled. After the annealing treatment has ended, the hydrogen must first be expelled by blowing in nitrogen before the hood can be removed.
  • the fresh gas is blown into the furnace below the blower and conveyed by the blower into the annular space between the annealing material and the hood.
  • the resulting gas mixture is discharged through the gas outlet.
  • the gas input during the exchange of the atmosphere is quite considerable.
  • the volume flow is 100 to 180 m-Vh, normally for a period of 20 to 40 minutes. However, this presupposes the full functionality of the fan. If the fan fails, the rinsing time is approx. 24 hours. This loss of operating time is' great weight. There is also a not inconsiderable gas consumption.
  • the object of the invention is to remedy this and to enable a more economical, above all faster, exchange of the atmosphere.
  • the method according to the invention is characterized in that the fresh gas is blown into a flow path leading upwards as a high-speed jet and that the following relationship applies to the speed of the jet:
  • Vf free furnace space volume in liters
  • M A molecular weight of the gas to be flushed out in g / mol
  • p s density of the fresh gas in g / m 3
  • the device according to the invention is characterized in that the gas inlet is designed as an upwardly directed nozzle which opens into an upwardly flowing flow path.
  • the invention is based on the knowledge that the speed of the incoming jet significantly influences the exchange process and for the optimization of the speed the density of the gas to be flushed out and the
  • the high-speed beam can be directed through the central opening of the glow plate into the central channel formed by the "eyes" of the coils. It makes sense to make the shaft of the blower hollow and, if necessary with a corresponding extension, to use it 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 N2, the ratio is preferably> 7.5.
  • the nozzle advantageously opens at the level of the annealing material plate, the nozzle mouth being preceded by a flow length with a constant diameter which corresponds approximately to 5 times the nozzle outlet diameter. It has been found that very favorable flow conditions can be achieved in this way.
  • the nozzle exit area is preferably approximately 10% of the area of the gas outlet. This measure is also suitable for promoting the rinsing process.
  • the gas outlet is preferably arranged in the annular space between the annealing material and the hood diametrically opposite the nozzle. If several gas outlets and nozzles are provided, these are each arranged on a common sector, the sectors being opposite one another. In any case, a flow is forced which essentially follows the hood contour over a large area.
  • the gas outlet is preferably shielded by a baffle assigned to the blower, so that it detects, above all, the flow close to the hood, with transverse, short-circuit-like flows being largely rejected.
  • the bell annealer has a base 1 with an annealing plate 2.
  • the latter carries coils 3 stacked one above the other, in the present case four in number. Their "eyes" form a central channel 4, which connects to a central opening 5 of the glow ember plate 2.
  • a fan 6 works below the central opening 5.
  • the coils 3 and the annealing material 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, specifically at a volume flow of 130 m * - / 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 of which is 80 mm.
  • the gas outlet is shielded by a baffle 11 assigned to the blower 6.

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)
  • Furnace Details (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP94926826A 1993-08-19 1994-08-06 Procede et dispositif de traitement thermique dans un four a recuire a cloche Expired - Lifetime EP0714452B1 (fr)

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 (fr) 1993-08-19 1994-08-06 Procede et dispositif permettant de remplacer l'atmosphere dans un four a recuire a cloche

Publications (2)

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

Family

ID=6495599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94926826A Expired - Lifetime EP0714452B1 (fr) 1993-08-19 1994-08-06 Procede et dispositif de traitement thermique dans un four a recuire a cloche

Country Status (7)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458154C1 (ru) * 2011-03-14 2012-08-10 Открытое акционерное общество "Магнитогорский металлургический комбинат" Способ отжига низкоуглеродистой стали, прокатанной на текстурированных валках

Families Citing this family (7)

* 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
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)

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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 (fr) * 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9505487A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458154C1 (ru) * 2011-03-14 2012-08-10 Открытое акционерное общество "Магнитогорский металлургический комбинат" Способ отжига низкоуглеродистой стали, прокатанной на текстурированных валках

Also Published As

Publication number Publication date
US5730930A (en) 1998-03-24
WO1995005487A1 (fr) 1995-02-23
DE59407661D1 (de) 1999-02-25
CN1043058C (zh) 1999-04-21
ATE175725T1 (de) 1999-01-15
EP0714452B1 (fr) 1999-01-13
RU2127325C1 (ru) 1999-03-10
DE4327975A1 (de) 1995-02-23
CN1138352A (zh) 1996-12-18

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