EP0869189A1 - Procédé de trempe en milieu gazeux de pièces métalliques - Google Patents

Procédé de trempe en milieu gazeux de pièces métalliques Download PDF

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Publication number
EP0869189A1
EP0869189A1 EP98103643A EP98103643A EP0869189A1 EP 0869189 A1 EP0869189 A1 EP 0869189A1 EP 98103643 A EP98103643 A EP 98103643A EP 98103643 A EP98103643 A EP 98103643A EP 0869189 A1 EP0869189 A1 EP 0869189A1
Authority
EP
European Patent Office
Prior art keywords
gas
quenching
mpa
cooling gas
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.)
Ceased
Application number
EP98103643A
Other languages
German (de)
English (en)
Inventor
Ernst Dr. Dipl.-Ing. Wandke
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 Gas AG
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
Publication of EP0869189A1 publication Critical patent/EP0869189A1/fr
Ceased 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material

Definitions

  • the invention relates to a method for gas quenching metallic workpieces after heat treatment in a heat treatment furnace, the gas quenching is carried out either in the furnace itself or in a gas-tight chamber and wherein the cooling gas is helium, hydrogen, mixtures of helium and hydrogen or mixtures of these with an additional up to 30% inert gas for use come and the cooling gas velocity v is set so that the product from cooling gas pressure p and cooling gas velocity v a value between 10 and Assumes 240 MPa m / sec and more.
  • a cooling gas pressure p in the furnace or the quenching chamber of more than 4 MPa (40 bar) is provided.
  • a cooling gas pressure p im Oven or quenching chamber set above 4 MPa and up to 5.5 MPa.
  • the cooling gas velocity v is set such that the product of the cooling gas pressure p and the cooling gas velocity v assumes a value between 80 and 660 MPa m / sec, preferably between 110 and 300 MPa m / sec.
  • the invention is also advantageously carried out in a variant in such a way that the Fumigation of the furnace or the cooling chamber using one or more so-called nozzle blocks with flow directed directly at the workpieces.
  • initially high gas flow velocities can also be used in later phases of cooling, e.g. in the second half of the cooling period, be reduced.
  • Another advantageous variant of the invention is that alternatively or additionally -in addition to the usual inert gases in the field of heat treatment such as nitrogen and argon inert gases with higher energy absorption capacity such as carbon dioxide, hydrogen sulfide or water vapor is added to the low density quenching gas the 30% share of the inert gases in the quenching gas is not exceeded.
  • nitrogen and argon inert gases with higher energy absorption capacity such as carbon dioxide, hydrogen sulfide or water vapor is added to the low density quenching gas the 30% share of the inert gases in the quenching gas is not exceeded.
  • Carbon dioxide is particularly preferably used for this purpose.
  • cooling chamber for the pressures mentioned suitably trained wall thickness and suitable closure elements for Available. This is also designed so that - in the quenching operation - essentially covering the entire cross section from top to bottom of cooling gas is flowed through. The quenched material is then placed in the cooling chamber for example ball bearing rings made of 100 Cr 6 steel, introduced as a deterrent, taking care that the workpieces are in a density and distribution are arranged so that all workpieces are caught by the cooling gas flow.
  • Cooling gas flow produced, for example, in the form of a gas circuit, wherein According to the invention, this is at a pressure level of 4.5 MPa (45 bar). Furthermore, a cooling gas speed of approx. 10 m / sec is set. As a cooling gas Hydrogen gas with a temperature of 20 to 40 ° C is used acts on the workpiece batch, which is approx. 900 ° C hot. After a cooling period of approx. A workpiece temperature of less than 100 ° C is reached within 30 seconds and thus a temperature of Quench rates comparable to quench baths.
  • An increase in the cooling rate is achieved here - and generally - if the cooling gas velocity is further increased, i.e. when cooling gas speeds of about 15 m / sec and more, possibly up to the range of 100 m / sec, be applied. Speeds of 20 are particularly relevant here up to 75 m / sec. This shortens the above-mentioned cooling time by a further 10 up to 15% possible. In the described way according to the present invention so particularly high requirements in connection with deterrence metallic workpieces can be fulfilled.

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 Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
EP98103643A 1997-03-11 1998-03-02 Procédé de trempe en milieu gazeux de pièces métalliques Ceased EP0869189A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997109957 DE19709957A1 (de) 1997-03-11 1997-03-11 Verfahren zur Gasabschreckung metallischer Werkstücke nach Wärmebehandlungen
DE19709957 1997-03-11

Publications (1)

Publication Number Publication Date
EP0869189A1 true EP0869189A1 (fr) 1998-10-07

Family

ID=7822949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98103643A Ceased EP0869189A1 (fr) 1997-03-11 1998-03-02 Procédé de trempe en milieu gazeux de pièces métalliques

Country Status (2)

Country Link
EP (1) EP0869189A1 (fr)
DE (1) DE19709957A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920297A1 (de) * 1999-05-03 2000-11-09 Linde Tech Gase Gmbh Verfahren zur Wärmebehandlung metallischer Werkstücke
EP1233078A2 (fr) * 2001-02-20 2002-08-21 Linde Aktiengesellschaft Procédé de trempe de pièces métalliques
FR2844809A1 (fr) * 2002-09-20 2004-03-26 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
EP2604710A1 (fr) * 2011-12-13 2013-06-19 Linde Aktiengesellschaft Procédé de durcissement d'une pièce métallique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005015450B3 (de) * 2005-04-04 2006-08-17 Ipsen International Gmbh Verfahren sowie Vorrichtung zur Gasabschreckung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0313888B1 (fr) * 1987-10-28 1991-07-31 ALD Vacuum Technologies GmbH Méthode pour le traitement thermique de pièces métalliques
EP0535319A1 (fr) * 1991-10-01 1993-04-07 Ipsen Industries International Gesellschaft Mit Beschränkter Haftung Four sous vide pour la carburisation de pièces métalliques par plasma
EP0495151B1 (fr) * 1991-01-15 1994-06-22 Linde Aktiengesellschaft Procédé pour le traitement thermique dans un four à vide

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0313888B1 (fr) * 1987-10-28 1991-07-31 ALD Vacuum Technologies GmbH Méthode pour le traitement thermique de pièces métalliques
EP0495151B1 (fr) * 1991-01-15 1994-06-22 Linde Aktiengesellschaft Procédé pour le traitement thermique dans un four à vide
EP0535319A1 (fr) * 1991-10-01 1993-04-07 Ipsen Industries International Gesellschaft Mit Beschränkter Haftung Four sous vide pour la carburisation de pièces métalliques par plasma

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
F. PREISSER ET AL.: "Hochdruck-Gasabschrecken .....", HTM HÄRTEREI-TECHNISCHE MITTEILUNGEN, vol. 52, no. 5, September 1997 (1997-09-01), MÜNCHEN, DE, pages 264 - 270, XP000702332 *
VORTRAG AUF DEM 52. HÄRTEREI-KOLLOQUIUM, 9.-11. OKTOBER 1996, WIESBADEN, DE *
W. PETER ET AL.: "Vakuum-Härteofen mit Gasabschrecksystemen", HTM HÄRTEREI-TECHNISCHE MITTEILUNGEN, vol. 51, no. 2, March 1996 (1996-03-01), MÜNCHEN, DE, pages 125 - 130, XP000588531 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920297A1 (de) * 1999-05-03 2000-11-09 Linde Tech Gase Gmbh Verfahren zur Wärmebehandlung metallischer Werkstücke
EP1233078A2 (fr) * 2001-02-20 2002-08-21 Linde Aktiengesellschaft Procédé de trempe de pièces métalliques
EP1233078A3 (fr) * 2001-02-20 2003-11-26 Linde Aktiengesellschaft Procédé de trempe de pièces métalliques
FR2844809A1 (fr) * 2002-09-20 2004-03-26 Air Liquide Procede de refroidissement rapide de pieces par transfert convectif et radiatif
WO2004027098A1 (fr) * 2002-09-20 2004-04-01 L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de refroidissement rapide de pieces par transfert convectif et radiatif
KR100953818B1 (ko) * 2002-09-20 2010-04-21 레르 리키드 쏘시에떼 아노님 뿌르 레드 에렉스뿔라따시옹 데 프로세데 조르즈 클로드 가압된 냉각 기체를 사용한 금속 부품의 급속 냉각 방법 및 급속 냉각 장치
EP2604710A1 (fr) * 2011-12-13 2013-06-19 Linde Aktiengesellschaft Procédé de durcissement d'une pièce métallique

Also Published As

Publication number Publication date
DE19709957A1 (de) 1998-09-17

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