EP0738785A1 - Procédé et installation pour le réglage de la concentration en CO de l'atmosphère d'un four pour la cémentation et carbonitruration de pièces métalliques - Google Patents

Procédé et installation pour le réglage de la concentration en CO de l'atmosphère d'un four pour la cémentation et carbonitruration de pièces métalliques Download PDF

Info

Publication number
EP0738785A1
EP0738785A1 EP96101732A EP96101732A EP0738785A1 EP 0738785 A1 EP0738785 A1 EP 0738785A1 EP 96101732 A EP96101732 A EP 96101732A EP 96101732 A EP96101732 A EP 96101732A EP 0738785 A1 EP0738785 A1 EP 0738785A1
Authority
EP
European Patent Office
Prior art keywords
content
furnace
furnace atmosphere
atmosphere
carburizing
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
EP96101732A
Other languages
German (de)
English (en)
Other versions
EP0738785B1 (fr
Inventor
Max Roggatz
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.)
Ipsen International GmbH
Original Assignee
Ipsen International 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 Ipsen International GmbH filed Critical Ipsen International GmbH
Publication of EP0738785A1 publication Critical patent/EP0738785A1/fr
Application granted granted Critical
Publication of EP0738785B1 publication Critical patent/EP0738785B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces

Definitions

  • the invention relates to a method for controlling the CO content of a furnace atmosphere for carburizing and carbonitriding metallic workpieces in a furnace, the furnace atmosphere by directly feeding a mixture of an oxidizing agent, eg. B. air, and a hydrocarbon-containing fuel and optionally ammonia (NH 3 ) is generated in the furnace.
  • an oxidizing agent eg. B. air
  • a hydrocarbon-containing fuel and optionally ammonia NH 3
  • the invention further relates to an apparatus for performing this method.
  • the required carburizing atmosphere is generated either in separate inert gas generators (endogas) or by feeding nitrogen with methanol into the furnace.
  • the furnace has a relatively stable CO value, which in the first case results from the setting of the protective gas generator and the fuel used in the protective gas generator, and in the second case from the percentage of methanol fed into the furnace.
  • a third variant is direct gassing with hydrocarbons and an oxidizing gas component, such as. B. air or CO 2 .
  • liquid or gaseous fuels are mixed with the oxidizing agent and fed into the furnace.
  • the CO content required for the carburization is generated in the furnace by direct reaction of the fuel with the oxygen of the oxidizing agent.
  • natural gas-air fumigation is currently the most widespread. This is due to the high availability and low price of natural gas.
  • the invention has for its object to provide a control for the CO content of the furnace atmosphere, which ensures continuous and trouble-free operation of the carburizing and carbonitriding furnaces even at low carburizing temperatures ( ⁇ 870 ° C) and also in the presence of ammonia (carbonitriding) .
  • the task of continuous and trouble-free operation with a regulated CO content is achieved in that the CO content of the furnace atmosphere is determined and a CO-forming substance is added to the furnace atmosphere when a freely adjustable minimum CO content is reached.
  • methanol is used as the CO-forming substance.
  • the methanol fed into the furnace atmosphere becomes after the reaction CH 3rd OH ⁇ CO + 2H 2nd split (at furnace temperatures ⁇ 800 ° C), whereby the CO content in the furnace atmosphere rises again above the set minimum CO content.
  • An alternative CO-forming substance is CO 2 .
  • an upper value for the CO content can additionally be set, upon reaching which the addition of the CO generator is stopped again until the CO content in the course the process has dropped back to the minimum CO content.
  • a CO content of around 12% has been found to be the minimum CO content in the furnace atmosphere, since falling below this value results in heavy soot formation and, moreover, the furnace atmosphere can no longer be precisely controlled.
  • a bandwidth between approximately 12% and 15% CO in the furnace atmosphere has proven to be particularly suitable as a bandwidth for the minimum and the upper CO content. Since below a CO content of 15% the course of the CO decrease is very flat, an increase in the CO content by adding the CO former up to this limit of about 15% is sufficient to keep the process going for a long time drive a CO content above the minimum limit. In addition, this narrow range means that only a little CO generator has to be used to increase the CO content, which in turn can keep the costs of the process low.
  • the device for carrying out the described method has a CO analyzer for determining the CO content in the furnace atmosphere and a programmable CO controller in order to control a valve and possibly a pump as a function of the CO content.
  • the valve and if necessary, the pump is switched to flow or operation when the set minimum CO content is reached.
  • the valve is closed again and the pump is switched off if necessary.
  • the diagram in FIG. 1 shows the course of the CO content during a carbonitriding process.
  • the CO content drops sharply in the course of the process.
  • the curve of the CO content curve runs very flat below 15% CO.
  • Below the 12% line shown as the minimum CO content limit the too low CO content in the furnace atmosphere causes the furnace to soot quickly.
  • the furnace atmosphere becomes a CO-forming substance, e.g. B. added methanol, which due to the high process temperature after the reaction CH 3rd OH ⁇ CO + 2H 2nd is split.
  • the control unit also has a programmable CO controller 3, to which freely adjustable values for the upper and lower CO content can be entered.
  • the CO controller 3 controls a valve 4 and possibly a pump 5 as soon as a comparison of the CO content determined by the CO analyzer 1 with the minimum CO content entered in the CO controller 3 has shown that this minimum CO content has been reached.
  • the CO generator is split as described above, so that the CO Content in the furnace atmosphere rises again. If the continuous comparison of the CO content determined by the CO analyzer 1 in the furnace atmosphere with the values stored in the CO controller 3 shows that the entered upper CO content has been reached, the valve is activated via the CO controller 3 4 closed and, if necessary, the pump 5 turned off again.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Furnace Details (AREA)
EP96101732A 1995-04-22 1996-02-07 Procédé et installation pour le réglage de la concentration en CO de l'atmosphère d'un four pour la cémentation et carbonitruration de pièces métalliques Expired - Lifetime EP0738785B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19514932 1995-04-22
DE19514932A DE19514932A1 (de) 1995-04-22 1995-04-22 Verfahren und Vorrichtung zur Regelung des CO-Gehaltes einer Ofenatmosphäre zum Aufkohlen und Carbonitrieren metallischer Werkstücke

Publications (2)

Publication Number Publication Date
EP0738785A1 true EP0738785A1 (fr) 1996-10-23
EP0738785B1 EP0738785B1 (fr) 1999-03-31

Family

ID=7760177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101732A Expired - Lifetime EP0738785B1 (fr) 1995-04-22 1996-02-07 Procédé et installation pour le réglage de la concentration en CO de l'atmosphère d'un four pour la cémentation et carbonitruration de pièces métalliques

Country Status (8)

Country Link
US (1) US5741371A (fr)
EP (1) EP0738785B1 (fr)
JP (1) JPH08296028A (fr)
CN (1) CN1136330C (fr)
AT (1) ATE178366T1 (fr)
CA (1) CA2174409C (fr)
DE (2) DE19514932A1 (fr)
ES (1) ES2129897T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859068A1 (fr) * 1997-02-18 1998-08-19 Dowa Mining Co., Ltd. Méthode et appareillage pour contrÔler l'atmosphère d'un four de traitement thermique
CN1316055C (zh) * 2002-05-22 2007-05-16 光洋热系统株式会社 渗碳用气氛气发生装置和方法
CZ298996B6 (cs) * 1999-08-25 2008-04-02 Messer Group Gmbh Zpusob nitridacního cementování kovových obrobku

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6635121B2 (en) * 2000-02-04 2003-10-21 American Air Liquide, Inc. Method and apparatus for controlling the decarburization of steel components in a furnace
EP2360287B1 (fr) * 2005-12-08 2013-08-07 NTN Corporation Procédé pour la nitrocementation gazeuse de composant de machine , procédé pour la fabrication d'un composant de machine et composant de machine
CN103589987B (zh) * 2013-12-06 2016-01-20 龙工（上海）精工液压有限公司 一种柱塞泵用传动轴的热处理工艺

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2044804A (en) * 1979-03-16 1980-10-22 Boc Ltd Heat treatment method
JPS57177969A (en) * 1981-04-23 1982-11-01 Chugai Ro Kogyo Kaisha Ltd Controlling method for carbon potential in furnace
EP0465226A1 (fr) * 1990-07-03 1992-01-08 Dowa Mining Co., Ltd. Procédé et appareil de carburation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH628092A5 (de) * 1978-03-21 1982-02-15 Ipsen Ind Int Gmbh Verfahren und vorrichtung zur regelung des kohlenstoffpegels eines chemisch reagierenden gasgemisches.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2044804A (en) * 1979-03-16 1980-10-22 Boc Ltd Heat treatment method
JPS57177969A (en) * 1981-04-23 1982-11-01 Chugai Ro Kogyo Kaisha Ltd Controlling method for carbon potential in furnace
EP0465226A1 (fr) * 1990-07-03 1992-01-08 Dowa Mining Co., Ltd. Procédé et appareil de carburation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 22 (C - 148) 28 January 1983 (1983-01-28) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859068A1 (fr) * 1997-02-18 1998-08-19 Dowa Mining Co., Ltd. Méthode et appareillage pour contrÔler l'atmosphère d'un four de traitement thermique
US6106636A (en) * 1997-02-18 2000-08-22 Dowa Mining Co., Ltd. Method and apparatus for controlling the atmosphere in a heat treatment furnace
CZ298996B6 (cs) * 1999-08-25 2008-04-02 Messer Group Gmbh Zpusob nitridacního cementování kovových obrobku
CN1316055C (zh) * 2002-05-22 2007-05-16 光洋热系统株式会社 渗碳用气氛气发生装置和方法

Also Published As

Publication number Publication date
JPH08296028A (ja) 1996-11-12
CN1136330C (zh) 2004-01-28
CA2174409A1 (fr) 1996-10-23
US5741371A (en) 1998-04-21
ATE178366T1 (de) 1999-04-15
CA2174409C (fr) 2009-06-23
CN1136597A (zh) 1996-11-27
DE59601530D1 (de) 1999-05-06
ES2129897T3 (es) 1999-06-16
DE19514932A1 (de) 1996-10-24
EP0738785B1 (fr) 1999-03-31

Similar Documents

Publication Publication Date Title
EP0049530B1 (fr) Procédé et dispositif pour carburer des pièces en acier
EP2302081B1 (fr) Procédé et dispositif de préparation de gaz de procédé pour des traitements à chaud de matériaux/pièces métalliques dans des fours industriels
DE647917C (de) Verfahren und Vorrichtung zur Gewinnung von Stickstoff oder eines Stickstoff-Wasserstoff-Gemisches
DE2450879A1 (de) Verfahren zur waermebehandlung von eisenmetallen
DE102008029001B3 (de) Verfahren und Einrichtung zur Wärmebehandlung von metallischen Werkstoffen
DE4212307A1 (de) Verfahren zur Herstellung eines Schutz- oder Reaktionsgases für die Wärmebehandlung von Metallen
EP0738785B1 (fr) Procédé et installation pour le réglage de la concentration en CO de l'atmosphère d'un four pour la cémentation et carbonitruration de pièces métalliques
CH628092A5 (de) Verfahren und vorrichtung zur regelung des kohlenstoffpegels eines chemisch reagierenden gasgemisches.
DE4400391A1 (de) Verfahren zur Vermeidung von Randoxidation beim Aufkohlen von Stählen
EP2878684A2 (fr) Procédé de commande du potentiel de réaction de décarburation d'un métal en fusion contenant du carbone pendant le traitement sous vide et par soufflage/gaz interne/oxygène
DE19719225C1 (de) Verfahren zur Regelung einer Nitrier- bzw. Nitrocarburier-Atmosphäre sowie Vorrichtung zur Durchführung des Verfahrens
DE3149212A1 (de) Verfahren zur eintellung von ofen-atmosphaeren
DE10359554B4 (de) Verfahren zur Aufkohlung metallischer Werkstücke in einem Vakuumofen
DE19610722B4 (de) Verfahren zum Herstellen von Schutz- oder Reaktionsgasen für die Wärmebehandlung von Metallen
DE3406792A1 (de) Verfahren und vorrichtung zum gluehen von metallteilen
DE2408984C3 (de) Verfahren zur Erzeugung definierter Nitrierschichten auf Eisen und Eisenlegierungen in einer sauerstoffhaltigen Gasatmosphäre und Anordnung zur Herstellung und Konstanthaltung der dafür erforderlichen Ausgangsgasgemische
EP0673443B1 (fr) Procede de recuit sans formation de suie de feuillards d'acier dans un four a recuit
WO2003097893A1 (fr) Procede et dispositif de traitement thermique de pieces metalliques
EP4065889B1 (fr) Combustion du co dans un gaz d'échappement métallurgique secondaire, avec régulation de la valeur calorifique et régulation du débit volumique
DE3534104C2 (fr)
EP0953654B1 (fr) Procédé et dispositif de cémentation gazeuse
DE3228892A1 (de) Verfahren und vorrichtung zur aufkohlung
DE142342C (fr)
DE192613C (fr)
DE19509614A1 (de) Regelung von Nitrier- und Nitrocarburieratmosphären

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES FR GB IT LI

17P Request for examination filed

Effective date: 19960907

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: IPSEN INTERNATIONAL GMBH

17Q First examination report despatched

Effective date: 19970611

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE ES FR GB IT LI

REF Corresponds to:

Ref document number: 178366

Country of ref document: AT

Date of ref document: 19990415

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: E. BLUM & CO. PATENTANWAELTE

ET Fr: translation filed
REF Corresponds to:

Ref document number: 59601530

Country of ref document: DE

Date of ref document: 19990506

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19990416

ITF It: translation for a ep patent filed

Owner name: ING. ZINI MARANESI & C. S.R.L.

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2129897

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: CH

Ref legal event code: PFA

Owner name: IPSEN INTERNATIONAL GMBH

Free format text: IPSEN INTERNATIONAL GMBH#FLUTSTRASSE 78#47533 KLEVE (DE) -TRANSFER TO- IPSEN INTERNATIONAL GMBH#FLUTSTRASSE 78#47533 KLEVE (DE)

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20140218

Year of fee payment: 19

Ref country code: DE

Payment date: 20140219

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20140212

Year of fee payment: 19

Ref country code: IT

Payment date: 20140227

Year of fee payment: 19

Ref country code: FR

Payment date: 20140219

Year of fee payment: 19

Ref country code: ES

Payment date: 20140226

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20140218

Year of fee payment: 19

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59601530

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 178366

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150207

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20150207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150228

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20151030

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150207

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150901

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150302

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20160329

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150208