EP0790320A1 - Four à cloche - Google Patents

Four à cloche Download PDF

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Publication number
EP0790320A1
EP0790320A1 EP96890020A EP96890020A EP0790320A1 EP 0790320 A1 EP0790320 A1 EP 0790320A1 EP 96890020 A EP96890020 A EP 96890020A EP 96890020 A EP96890020 A EP 96890020A EP 0790320 A1 EP0790320 A1 EP 0790320A1
Authority
EP
European Patent Office
Prior art keywords
hood
annular gap
protective
base
annealing
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.)
Withdrawn
Application number
EP96890020A
Other languages
German (de)
English (en)
Inventor
Peter Helmut Dipl.-Ing. Ebner
Heribert Dipl.-Ing. Lochner
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to EP96890020A priority Critical patent/EP0790320A1/fr
Publication of EP0790320A1 publication Critical patent/EP0790320A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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 bell annealer, in particular for steel strip or wire coils, with an annealing base for storing the annealing material and a protective hood that can be placed tightly on the annealing base, wherein in the annealing base a fan with a central impeller and this surrounding guide apparatus for circulating the one located in the protective hood Shielding gas is provided.
  • both the heat treatment and the necessary subsequent cooling take place under protective gases, which usually contain nitrogen or hydrogen or a mixture of these gases and are used primarily for the purpose of avoiding oxidation on the metal surface of the annealing material.
  • protective gases usually contain nitrogen or hydrogen or a mixture of these gases and are used primarily for the purpose of avoiding oxidation on the metal surface of the annealing material.
  • the annealing material stored on the annealing base is covered by the protective hood in which, after an evacuation or flushing out process, the protective gas is coated on the annealing surface by a forced circulation caused by the fan.
  • a heating hood placed over the protective hood for heating is replaced by a cooling hood and the batch is cooled by air flowing over the outer surface of the protective hood.
  • water can be added instead of the switched-off cooling air flow after reaching a certain temperature level.
  • the invention is therefore based on the object of eliminating these deficiencies and of creating a hood annealing furnace of the type described at the outset in which the cooling process is accelerated without fear of damage or contamination and without having to provide any additional space underneath the annealing base.
  • the invention solves this problem by means of a closable annular gap arranged between the impeller and the diffuser, which is followed by a heat exchanger from which the portion of protective gas diverted into the annular gap flows back into the protective hood.
  • the annular gap is of course closed during the heat treatment and the usual circulation of the entire protective gas results.
  • part of the protective gas flow is passed through the annular gap and the heat exchanger, that is to say cooled, and only then admixed with the still warm protective gas, so that the protective gas cools down more quickly and thus the cooling process is shortened.
  • No additional fan is required, and only the downstream heat exchanger is required, the dimensions of which are relatively small and do not require any significant space below the glow base. This results in a substantially lower technical outlay with approximately the same effect as in the known external cooling circuit. Since there is no additional fan, there is no need to worry about contamination from evaporating lubricant residues.
  • annular gap for returning the portion of the protective gas emerging from the heat exchanger is left free in a manner known per se between the glow base and the protective hood jacket.
  • the blades of the guide device each have a recess in the area of the closable annular gap for the entry of the closure collar when the annular gap is opened.
  • the drawing shows schematically an axial section of half of the parts of a bell annealing furnace essential to the invention.
  • the hood annealing furnace has an annealing base 1 for storing the indicated annealing material 2 and a protective hood 3 which can be placed tightly on the annealing base 1.
  • a fan with a central impeller 4 and a diffuser 5 surrounding it is provided in the glow base 1.
  • the construction carrying the annealing material 2 is not shown for the sake of simplicity.
  • annular gap 7 is arranged between the impeller 4 and the diffuser 5 and leads downward to the heat exchanger 8, an annular gap 9 likewise being provided between the glow base or the filling device 6 and the glow hood 3, so that the gas can flow from the annular gap 9 through the heat exchanger 8 back into the main space of the protective hood 3.
  • a cylinder 11 carrying a closure collar is provided, which can be displaced with the aid of an adjusting device 12 arranged outside the glow base 1 and connecting rods 13, which penetrate the bottom of the glow base under sealing, so that the closure collar 10 can be moved Closes annular gap 7 or can be brought into different open positions.
  • the blades of the guide apparatus 5 are each provided with a recess 14.
  • part of the protective gas passes from the fan 4 into the annular duct 7, from there to the heat exchanger 8 and finally mixes with the main flow under the glow hood 3 when it flows back.

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)
  • Furnace Details (AREA)
  • Heat Treatment Of Articles (AREA)
EP96890020A 1996-02-13 1996-02-13 Four à cloche Withdrawn EP0790320A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96890020A EP0790320A1 (fr) 1996-02-13 1996-02-13 Four à cloche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96890020A EP0790320A1 (fr) 1996-02-13 1996-02-13 Four à cloche

Publications (1)

Publication Number Publication Date
EP0790320A1 true EP0790320A1 (fr) 1997-08-20

Family

ID=8226189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96890020A Withdrawn EP0790320A1 (fr) 1996-02-13 1996-02-13 Four à cloche

Country Status (1)

Country Link
EP (1) EP0790320A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1462529A1 (fr) * 2003-03-24 2004-09-29 Ebner Industrieofenbau Gesellschaft m.b.H. Four à cloche, en particulier pour bobines de fil ou de bande d'acier
WO2018040291A1 (fr) * 2016-08-30 2018-03-08 盐城圣奥热处理有限公司 Four de recuit de type en cloche

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1253742B (de) * 1964-05-23 1967-11-09 Wellman Incandescent Furn Co Vorrichtung zur Waermebehandlung von Werkstuecken, insbesondere von gewickelten Eisen- und Metallbaendern
DE2228215A1 (de) * 1971-12-29 1973-07-12 Guinea Hermanos Ingenieros Sa Vorrichtung zum beschleunigten kuehlen von chargen in hochoefen mit zwangsumlauf und gesteuerter atmosphaere
US4310302A (en) * 1980-03-28 1982-01-12 Midland-Ross Corporation Batch coil annealing furnace baseplate
US4445852A (en) * 1982-05-10 1984-05-01 Corbett Reg D Diffusers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1253742B (de) * 1964-05-23 1967-11-09 Wellman Incandescent Furn Co Vorrichtung zur Waermebehandlung von Werkstuecken, insbesondere von gewickelten Eisen- und Metallbaendern
DE2228215A1 (de) * 1971-12-29 1973-07-12 Guinea Hermanos Ingenieros Sa Vorrichtung zum beschleunigten kuehlen von chargen in hochoefen mit zwangsumlauf und gesteuerter atmosphaere
US4310302A (en) * 1980-03-28 1982-01-12 Midland-Ross Corporation Batch coil annealing furnace baseplate
US4445852A (en) * 1982-05-10 1984-05-01 Corbett Reg D Diffusers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1462529A1 (fr) * 2003-03-24 2004-09-29 Ebner Industrieofenbau Gesellschaft m.b.H. Four à cloche, en particulier pour bobines de fil ou de bande d'acier
WO2018040291A1 (fr) * 2016-08-30 2018-03-08 盐城圣奥热处理有限公司 Four de recuit de type en cloche

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