EP0355520A2 - Procédé de traitement thermique de pièces à usiner - Google Patents

Procédé de traitement thermique de pièces à usiner Download PDF

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Publication number
EP0355520A2
EP0355520A2 EP89114350A EP89114350A EP0355520A2 EP 0355520 A2 EP0355520 A2 EP 0355520A2 EP 89114350 A EP89114350 A EP 89114350A EP 89114350 A EP89114350 A EP 89114350A EP 0355520 A2 EP0355520 A2 EP 0355520A2
Authority
EP
European Patent Office
Prior art keywords
furnace
treatment
flow
treatment gas
gas
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
EP89114350A
Other languages
German (de)
English (en)
Other versions
EP0355520A3 (en
EP0355520B1 (fr
Inventor
Peter Dr. Dipl.-Ing. Vocke
Thomas Dipl.-Ing. Kamm
Andreas Dipl.-Ing. Dey
Hilmar Dipl.-Ing. Storz
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.)
Linde GmbH
Original Assignee
Linde 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
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to AT89114350T priority Critical patent/ATE104360T1/de
Publication of EP0355520A2 publication Critical patent/EP0355520A2/fr
Publication of EP0355520A3 publication Critical patent/EP0355520A3/de
Application granted granted Critical
Publication of EP0355520B1 publication Critical patent/EP0355520B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids

Definitions

  • the invention relates to a method for the heat treatment of workpieces in a treatment gas atmosphere in a continuous furnace with an inlet, treatment and cooling zone.
  • heat treatment processes for metallic workpieces under a wide variety of treatment gas atmospheres are known.
  • these are carburizing, hardening, nitriding and annealing processes e.g. among endogas, exogas, methanol and ammonia cracked gas and gases that are delivered ready to use and can be removed from storage tanks (e.g. nitrogen, hydrogen).
  • Heat treatment methods under treatment gas for ceramic workpieces in continuous furnaces are also known, e.g. the burning of such workpieces.
  • the treatment gas atmospheres can be divided into protective gas atmospheres and reaction gas atmospheres. Shielding gases have the task of to protect the treating materials during heat treatment from undesired influences, for example from reactions with the oxygen, carbon dioxide or water vapor contained in the air, while desired reactions with the material to be treated are brought about in reaction gas atmospheres.
  • the treatment gases are generally introduced into the heat treatment devices or furnaces at a number of points with a pressure slightly above atmospheric pressure (approximately between 0.01 and 0.2 mbar) and a low flow rate.
  • the feed quantities and the feed points are selected so that a treatment gas atmosphere which is of sufficient quality for the respective treatment is established throughout the device and leak losses are compensated for.
  • there is no deliberately chosen preferred flow direction of the introduced treatment gas but rather a flow depends on the particular furnace design, the flow essentially from one or more feed points to one or more main outflow points, e.g. the furnace entrance and exit.
  • a heat treatment method for a continuous furnace is known from EP-B1 75 438, for example, in which a flow in the direction of the furnace entrance is brought about essentially by a curtain-like separation at the furnace exit and a suitable introduction rate of the treatment gas into the different furnace regions. As a result, the total amount of treatment gas required for a heat treatment is reduced.
  • a blowing device particularly suitable for carrying out the invention essentially consists of a straight, elongated tube, one end of which is closed except for one or more gas outlet openings with the desired orientation and which can be connected to a treatment gas supply via the other end.
  • a straight, elongated tube in contrast to curved or diameter-varying shapes, can simply be inserted into an opening in the furnace wall and installed therein.
  • the tubular injection device is designed to be rotatable about its longitudinal axis at least by 180 ° at least in the region of the gas outlet opening (s).
  • part of the treatment gas is blown into the cooling zone of the furnace system with the aid of blowing device 7.
  • the blowing device 7 is arranged approximately in the central part of the cooling zone 4 and, in the case shown, is aligned against the direction of flow of the objects to be treated.
  • Treatment gas is also fed on both sides of the blowing device 7 with supply lines 13, 14 to the cooling zone. Due to the directed blowing at high pressure, i.e. pressure between 1 and 20 bar, preferably between 2 and 6 bar, the gas surrounding the blowing nozzle is entrained and so there is initially a flow in the cooling zone which flows to the treatment zone 3, whereby on Oven exit 6 even a small proportion of the outside air is sucked in.
  • this flow orientation results in a type of stowage area, in which treatment gas flowing out of the treatment zone and flowing with the flow from the cooling zone 4 runs against one another. Overall, this essentially prevents treatment gas from flowing out of the treatment zone into the cooling zone. The result of this is that excess treatment gas flows out of the treatment zone 3 essentially towards the inlet zone 2, which in turn creates a gas flow there opposite to the direction of flow towards the furnace inlet 5.
  • a furnace gas flow similar to that described below in connection with FIG. 2, can be generated in the direction of flow of the objects to be treated.
  • FIG. 2 shows a continuous furnace 1 with two blowing devices 7, 8 which can be switched alternately via the three-way valve 10 and only one further feed line 14 for treatment gas into the cooling zone 4. If the blowing device 7 is switched, a furnace gas flow against the direction of flow is generated in a manner similar to that just described. If a furnace train is to be produced in the direction of flow, treatment gas 8 is blown in the direction of the furnace exit into the cooling zone with the blowing device 8 arranged in the first third of the cooling zone 4 following the treatment zone 3, which in turn acts upon the entire atmosphere in the cooling zone with this flow direction and in addition - with this arrangement of the injection nozzle 8 - treatment gas is already sucked out of the treatment zone 3.
  • the aim with regard to heat treatments under treatment gas is the inevitable intrusion of air components into the furnace - which is known to be reduced by a high throughput of treatment gas through the furnace - intentionally allowed on one side on the side that is harmless to the heat treatment material. This is achieved through the directional flow.
  • significant savings in treatment gas are possible compared to the conventional process, since the furnace atmosphere can still be produced in all furnace areas with the necessary purity using a smaller amount of gas. This is an essential effect of the method according to the invention.
  • the amount of the injected treatment gas is between 3 and 35%, preferably between 5 and 20%, of the amount that is supplied to the heat treatment device in a conventional manner.
  • An example of a treatment in which the method according to the invention can be used with a furnace train directed against the direction of flow is the annealing of nickel-copper alloys, since the penetration of air, especially oxygen, into the materials due to the high corrosion resistance of these materials the cooling zone does not deteriorate the annealing result.
  • the annealing of steel should be mentioned, in which it is possible to work with a furnace train directed in the direction of passage, since a certain degree of contamination from the air, in particular based on carbon dioxide, is tolerable for steel in the entrance area of the treatment furnace.
  • the method according to the invention can also be used to influence a flow occurring from the beginning in a treatment furnace.
  • a flow occurring from the beginning in a treatment furnace For example, in an oven system due to unfavorable drafts in the hall surrounding the oven system, the use of the method according to the invention, even in a controlled version with an oven draft sensor and a correspondingly adjustable injection pressure, is a suitable way of generating a desired oven draft.
  • the method according to the invention can be used in many heat treatments in an economically and / or technically advantageous manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Tunnel Furnaces (AREA)
EP89114350A 1988-08-18 1989-08-03 Procédé de traitement thermique de pièces à usiner Expired - Lifetime EP0355520B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89114350T ATE104360T1 (de) 1988-08-18 1989-08-03 Verfahren zur waermebehandlung von werkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3828134 1988-08-18
DE3828134A DE3828134A1 (de) 1988-08-18 1988-08-18 Verfahren zur waermebehandlung von werkstuecken

Publications (3)

Publication Number Publication Date
EP0355520A2 true EP0355520A2 (fr) 1990-02-28
EP0355520A3 EP0355520A3 (en) 1990-04-18
EP0355520B1 EP0355520B1 (fr) 1994-04-13

Family

ID=6361156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114350A Expired - Lifetime EP0355520B1 (fr) 1988-08-18 1989-08-03 Procédé de traitement thermique de pièces à usiner

Country Status (4)

Country Link
EP (1) EP0355520B1 (fr)
AT (1) ATE104360T1 (fr)
DE (2) DE3828134A1 (fr)
ZA (1) ZA896284B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0524368A1 (fr) * 1991-06-27 1993-01-27 Leybold Durferrit GmbH Dispositif automatique de surveillance et de contrôle d'un four de traitement thermique sous vide
EP1077267A1 (fr) * 1999-08-18 2001-02-21 Patherm SA Installation de traitement thermique de pièces métalliques en lots ou unitaires au défilé
WO2005035799A1 (fr) * 2003-10-08 2005-04-21 Messer Austria Gmbh Procede de traitement thermique de matieres ferreuses
EP1842931A1 (fr) * 2006-04-04 2007-10-10 Linde Aktiengesellschaft Procédé de traitement de la chaleur
EP1842930A1 (fr) * 2006-04-04 2007-10-10 Linde Aktiengesellschaft Procédé de traitement thermique
US7955450B2 (en) 2006-04-04 2011-06-07 Linde Aktiengesellschaft Method for heat treatment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE617319C (de) * 1931-05-02 1935-08-16 Benno Schilde Maschb Akt Ges Verfahren und Einrichtung zum Blankgluehen
US3415503A (en) * 1967-08-18 1968-12-10 Btu Eng Corp Conditioned atmosphere furnace muffle
DE2601658A1 (de) * 1976-01-17 1977-07-28 J F Mahler Fa Kuehlvorrichtung fuer einen durchlaufofen
EP0075438B1 (fr) * 1981-09-19 1987-12-16 BOC Limited Traitement thermique de métaux

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2844843C2 (de) * 1978-10-14 1985-09-12 Ipsen Industries International Gmbh, 4190 Kleve Industrieofen zur Wärmebehandlung metallischer Werkstücke
JPS57192215A (en) * 1981-05-21 1982-11-26 Ishikawajima Harima Heavy Ind Co Ltd Metal-heating oven
DE3208574A1 (de) * 1982-03-10 1983-09-22 Schmetz Industrieofenbau und Vakuum-Hartlöttechnik KG, 5750 Menden "vakuum-schachtofen"
DE3736501C1 (de) * 1987-10-28 1988-06-09 Degussa Verfahren zur Waermebehandlung metallischer Werkstuecke

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE617319C (de) * 1931-05-02 1935-08-16 Benno Schilde Maschb Akt Ges Verfahren und Einrichtung zum Blankgluehen
US3415503A (en) * 1967-08-18 1968-12-10 Btu Eng Corp Conditioned atmosphere furnace muffle
DE2601658A1 (de) * 1976-01-17 1977-07-28 J F Mahler Fa Kuehlvorrichtung fuer einen durchlaufofen
EP0075438B1 (fr) * 1981-09-19 1987-12-16 BOC Limited Traitement thermique de métaux

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0524368A1 (fr) * 1991-06-27 1993-01-27 Leybold Durferrit GmbH Dispositif automatique de surveillance et de contrôle d'un four de traitement thermique sous vide
US5362031A (en) * 1991-06-27 1994-11-08 Leybold Durfrrit Gmbh Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven
EP1077267A1 (fr) * 1999-08-18 2001-02-21 Patherm SA Installation de traitement thermique de pièces métalliques en lots ou unitaires au défilé
WO2005035799A1 (fr) * 2003-10-08 2005-04-21 Messer Austria Gmbh Procede de traitement thermique de matieres ferreuses
EP1842931A1 (fr) * 2006-04-04 2007-10-10 Linde Aktiengesellschaft Procédé de traitement de la chaleur
EP1842930A1 (fr) * 2006-04-04 2007-10-10 Linde Aktiengesellschaft Procédé de traitement thermique
US7955450B2 (en) 2006-04-04 2011-06-07 Linde Aktiengesellschaft Method for heat treatment

Also Published As

Publication number Publication date
ATE104360T1 (de) 1994-04-15
EP0355520A3 (en) 1990-04-18
DE3828134A1 (de) 1990-02-22
EP0355520B1 (fr) 1994-04-13
ZA896284B (en) 1990-04-25
DE58907441D1 (de) 1994-05-19

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