EP0735149A1 - Dispositif pour le traitement thermique d'articles métalliques sous vide - Google Patents

Dispositif pour le traitement thermique d'articles métalliques sous vide Download PDF

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Publication number
EP0735149A1
EP0735149A1 EP96101733A EP96101733A EP0735149A1 EP 0735149 A1 EP0735149 A1 EP 0735149A1 EP 96101733 A EP96101733 A EP 96101733A EP 96101733 A EP96101733 A EP 96101733A EP 0735149 A1 EP0735149 A1 EP 0735149A1
Authority
EP
European Patent Office
Prior art keywords
furnace
chamber
carburizing
rotary
designed
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
EP96101733A
Other languages
German (de)
English (en)
Other versions
EP0735149B1 (fr
Inventor
Bernd Dr. Edenhofer
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 EP0735149A1 publication Critical patent/EP0735149A1/fr
Application granted granted Critical
Publication of EP0735149B1 publication Critical patent/EP0735149B1/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor
    • 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
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0059—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising tracks, e.g. rails and wagon
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D2099/0078—Means to minimize the leakage of the furnace atmosphere during charging or discharging
    • F27D2099/008—Using an air-lock
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/04—Ram or pusher apparatus

Definitions

  • the invention relates to a device for the heat treatment of metallic workpieces under vacuum with a rotary cycle furnace with an annular turntable and a feed lock and an output lock, wherein the workpiece batches can be moved to different processing positions by means of the turntable.
  • Such a device in which the workpieces to be treated can be fed to different machining positions by means of a turntable, is known, for example, from DE-PS 40 05 956.
  • the turntable arranged in a vacuum chamber is divided into different rooms by partitions, so that different treatments at different processing positions are possible.
  • the workpiece batches arranged in the separated rooms are fed to different processing positions within the vacuum chamber, at which the workpieces can be subjected to various plasma treatments and / or heat treatments.
  • EP-PS 0 198 871 discloses the use of a rotary cycle furnace for the treatment of metallic workpieces in a carburizing atmosphere.
  • the first rotary cycle furnace in which the carburizing phase takes place, is followed by a further rotary cycle furnace or a piercing furnace for the diffusion phase.
  • This plant concept as well as the previously described plant concept according to DE-PS 40 05 956 can essentially be used for two-stage carburizing processes which consist of a carburizing phase and a diffusion phase which take place in succession.
  • the invention has for its object to provide a device for the heat treatment of metallic workpieces under vacuum, which allows a flexible change between different batches with different case hardening depths, without the change in carburizing conditions affecting the other batches.
  • the technical solution to this problem by the invention is characterized in that the rotary cycle furnace is designed as a vacuum ring furnace for the diffusion phase and that at least one separate carburizing furnace chamber is arranged on the periphery of the rotary cycle furnace at least between the feed lock and the output lock, into which the workpiece batches can be introduced for a carburizing treatment are.
  • the main advantage of such an embodiment according to the invention is that the rotary cycle furnace is used only for the diffusion and the workpiece batches can be inserted, if necessary, for the carburizing phases into the individual carburizing chambers arranged separately on the ring. After a carburizing phase, the batch of workpieces is moved back into the rotary kiln for diffusion until it is again brought into a carburizing furnace chamber for a next carburizing phase or until the carburizing process can be removed from the rotary kiln after the carburizing process has ended.
  • the carburizing furnace chambers can be designed as plasma furnaces or vacuum furnaces.
  • At least one heating chamber is connected between the feed lock and the rotary transfer oven. Since the workpiece batches are heated from the outside, it can be advantageous, in particular in the case of solid workpieces, that a temperature compensation chamber is interposed between the heating chamber and the rotary cycle furnace, in which a uniform temperature distribution in the workpiece batch can be established.
  • the compensation chamber can be designed as a hydrogen sputtering chamber for cleaning the surface of the workpieces.
  • a hydrogen sputtering chamber for cleaning the surface of the workpieces.
  • Such cleaning of the workpiece surfaces by means of a hydrogen plasma is particularly advantageous if the at least one carburizing furnace chamber arranged on the rotary indexing furnace is designed as a plasma furnace.
  • the delivery lock is designed as a cooling chamber.
  • the direct design of the delivery lock as a cooling chamber enables a particularly space-saving and compact construction of the system.
  • the cooling chamber can be designed as a gas quenching chamber or can be equipped with a liquid quenching bath.
  • a hardening furnace can be inserted between the rotary indexing furnace and the cooling chamber, in which the batch is first cooled to the hardening temperature before it is subsequently quenched in the cooling chamber becomes.
  • each carburizing furnace chamber is assigned two impact devices which can be operated either electrically, pneumatically or hydraulically.
  • the device for heat treatment of metallic workpieces in batches 1 shown in FIG. 1 consists of a feed lock 2, a heating chamber 3, a compensation chamber 4, a rotary cycle furnace 5 as a diffusion furnace, two carburizing furnace chambers 6 and an output lock 7 in the direction of the transport path of the batches 1.
  • the feed lock 2 is loaded with the workpiece batches to be treated from a batch store (not shown) via a transport device 8.
  • doors 2a and 2b of the feed lock 2 are closed and the feed lock 2 is evacuated by a pump, not shown, since the subsequent treatment of the batches 1 in the chambers 3 and 4 and the rotary cycle oven 5 is carried out under vacuum.
  • the door 2b is then opened, the batch 1 is conveyed into the heating chamber 3 by means of a pushing device 2c and the door 2b is closed again.
  • the batch 1 is heated up to the treatment temperature by means of heaters (not shown). H. except for the temperature that also prevails in rotary cycle furnace 5.
  • the heating chamber 3 is followed by the compensation chamber 4, a door 3a being arranged between the heating chamber 3 and the compensation chamber 4 and the transport of the batch 1 within the heating chamber 3 via a pushing device 3c and the transport from the heating chamber 3 into the compensation chamber 4 an impact device 3b takes place.
  • a batch 1 has left the heating chamber 3 into the equalization chamber 4, a new batch 1 is brought into the heating chamber 3 via the feed lock 2.
  • the batches 1 in the heating chamber 3 are only heated from the outside by radiation, in particular massive workpieces do not yet have a uniform temperature distribution when the surface has already reached the treatment temperature and therefore batch 1 is removed from the heating chamber 3, in order not to load the workpiece with too high a temperature.
  • the temperature in the workpiece can compensate.
  • the temperature in the compensation chamber 4 is regulated so that it is always kept at a constant temperature, namely the desired treatment temperature.
  • the usual treatment temperatures are between 800 ° C and 1000 ° C.
  • the batch 1 is pushed into the rotary cycle oven 5 by means of a pushing device 4b and the door 4a is closed again.
  • the batch 1 is transported directly to one of the carburizing furnace chambers 6 by means of the annular rotary plate of the rotary kiln 5.
  • the chambers 6 are evacuated by means of a pump (not shown) before a batch 1 is inserted.
  • a furnace chamber door 6a is opened and the batch 1 is pushed into the carburizing furnace chamber 6 by means of a pushing device 6b arranged on the inside of the rotary kiln and the furnace chamber door 6a is closed again.
  • the actual carburizing process is carried out in the carburizing furnace chamber, which is designed either as a plasma furnace or as a vacuum furnace.
  • the carburizing furnace is switched off again and, if necessary, the process gas is removed from the carburizing furnace chamber 6.
  • the furnace chamber door 6a is opened again and the batch 1 is pushed back into the rotary cycle furnace 5 by means of a pushing device 6c arranged opposite the pushing device 6b.
  • the diffusion phase takes place, in which the marginal carbon content drops again.
  • the described carburizing process and the diffusion phase are repeated several times. Due to the construction of the device with the rotary furnace 5 for the diffusion phase and the external carburizing furnace chambers 6 for the actual carburizing process, an optimal utilization of the device is guaranteed, since while a batch 1 already treated in a carburizing furnace chamber 6 remains in the rotary furnace 5 for the diffusion phase, another one Batch 1 with possibly different carburizing conditions can be brought into the carburizing furnace chamber 6. Depending on how many carburizing furnace chambers 6 are arranged along the circumference of the rotary furnace 5, the flexibility of this device can be increased and the treatment time can be shortened.
  • the batch 1 is transported in front of a door 7a of the delivery lock 7. Subsequently the output lock 7 is evacuated, the door 7a is opened and the batch 1 is conveyed into the output lock 7 by means of an impact device 7b. After the door 7a has been closed, the batch 1 can be quenched with gas or in a liquid bath in the output lock 7 designed as a cooling chamber.
  • the second embodiment of the device shown in FIG. 2 is identical to the device according to FIG. 1 except for the area of the delivery lock 7.
  • a hardening furnace 9 is interposed between the rotary cycle furnace 5 and the output lock 7 designed as a cooling chamber.
  • Such a hardening furnace 9 is necessary if the carburizing temperature in the carburizing furnace chambers 6 is clearly above the hardening temperature of batch 1 and the batch 1 has to be cooled to the hardening temperature after the carburizing process and before quenching.
  • the batch 1 first passes through the hardening furnace 9 after the last diffusion phase in the rotary cycle furnace 5, in order then to be quenched in the cooling chamber of the delivery lock 7.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Tunnel Furnaces (AREA)
EP96101733A 1995-03-31 1996-02-07 Dispositif pour le traitement thermique d'articles métalliques sous vide Expired - Lifetime EP0735149B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29505496U 1995-03-31
DE29505496U DE29505496U1 (de) 1995-03-31 1995-03-31 Vorrichtung zur Wärmebehandlung metallischer Werkstücke unter Vakuum

Publications (2)

Publication Number Publication Date
EP0735149A1 true EP0735149A1 (fr) 1996-10-02
EP0735149B1 EP0735149B1 (fr) 1999-12-22

Family

ID=8006191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96101733A Expired - Lifetime EP0735149B1 (fr) 1995-03-31 1996-02-07 Dispositif pour le traitement thermique d'articles métalliques sous vide

Country Status (7)

Country Link
US (1) US5722825A (fr)
EP (1) EP0735149B1 (fr)
JP (1) JPH08285462A (fr)
AT (1) ATE187985T1 (fr)
CA (1) CA2173058A1 (fr)
DE (2) DE29505496U1 (fr)
ES (1) ES2141401T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811697A2 (fr) * 1996-06-06 1997-12-10 Dowa Mining Co., Ltd. Procédé et dispositif pour la carburation, la trempe et le revenu
WO2003081156A1 (fr) * 2002-03-27 2003-10-02 Loi Thermprocess Gmbh Installation pour le traitement thermique de pieces a usiner
WO2014170022A1 (fr) * 2013-04-17 2014-10-23 Ald Vacuum Technologies Gmbh Procédé et dispositif de durcissement thermochimique de pièces
EP3054019A1 (fr) 2015-02-04 2016-08-10 Seco/Warwick S.A. Four à chambres multiples de cémentation sous vide et par trempe d'engrenages, d'arbres, d'anneaux et de pièces similaires
EP2717008A3 (fr) * 2012-10-08 2017-08-23 Ipsen International GmbH Four industriel étanche au gaz de protection, notamment four à chambre, four poussant, four à sole tournante ou four à sole annulaire
CN111424154A (zh) * 2020-05-12 2020-07-17 浙江三基钢管有限公司 一种可定量放料的加热炉

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0922120B1 (fr) * 1996-08-30 2001-10-24 Franz Hillingrathner Four rotatif pour traitement de pieces
DE19639933C1 (de) * 1996-08-30 1998-04-09 Franz Hillingrathner Rundtaktofen zum Behandeln von Werkstücken
DE19635257C1 (de) * 1996-08-30 1998-03-12 Franz Hillingrathner Rundtaktofen zum Behandeln von Werkstücken
DE19638106C1 (de) * 1996-08-30 1998-04-09 Franz Hillingrathner Rundtaktofen zum Behandeln von Werkstücken
AT404029B (de) * 1996-09-16 1998-07-27 Ald Aichelin Ges M B H Niederdruck-aufkohlungsanlage
GB9704229D0 (en) * 1997-02-28 1997-04-16 Mckechnie Plc Fastener installing machine
JPH1129821A (ja) * 1997-07-11 1999-02-02 Ntn Corp 浸炭焼入装置
DE19953654A1 (de) * 1999-11-08 2001-05-23 Pink Gmbh Vakuumtechnik Verfahren und Vorrichtung zur Herstellung einer Lotverbindung
JP4537522B2 (ja) * 2000-02-07 2010-09-01 中外炉工業株式会社 間欠駆動式真空浸炭炉
DE50112495D1 (de) * 2001-01-26 2007-06-21 Ipsen Int Gmbh Vorrichtung und Verfahren zum Transportieren metallischer Werkstücke sowie Anlage zur Wärmebehandlung dieser Werkstücke
JP5092170B2 (ja) * 2001-03-29 2012-12-05 Ｄｏｗａサーモテック株式会社 浸炭焼入れ方法及び浸炭焼入れ装置
JP5428031B2 (ja) * 2001-06-05 2014-02-26 Ｄｏｗａサーモテック株式会社 浸炭処理方法及びその装置
US7276204B2 (en) * 2001-06-05 2007-10-02 Dowa Thermotech Co., Ltd. Carburization treatment method and carburization treatment apparatus
JP5428032B2 (ja) * 2001-06-05 2014-02-26 Ｄｏｗａサーモテック株式会社 浸炭処理方法
EP1333105B1 (fr) * 2002-02-04 2008-04-02 Ipsen International GmbH Procédé pour le traitement thermique d'articles métalliques et article traité thermiquement
EP1913912B2 (fr) 2003-02-12 2020-03-18 The Procter and Gamble Company Partie centrale absorbante pour un article absorbant
US20050016831A1 (en) * 2003-07-24 2005-01-27 Paganessi Joseph E. Generation of acetylene for on-site use in carburization and other processes
US8684988B2 (en) * 2004-06-29 2014-04-01 The Procter & Gamble Company Disposable absorbent article having barrier cuff strips
US7598477B2 (en) * 2005-02-07 2009-10-06 Guy Smith Vacuum muffle quench furnace
US20090304907A1 (en) * 2008-06-09 2009-12-10 Applied Materials, Inc. Coating system and method for coating a substrate
US9719149B2 (en) * 2011-12-23 2017-08-01 Ipsen, Inc. Load transport mechanism for a multi-station heat treating system
CN103276165B (zh) * 2013-06-07 2016-09-07 鞍钢股份有限公司 一种环形炉节能操作方法
WO2018221465A1 (fr) * 2017-05-29 2018-12-06 株式会社Ihi Dispositif de traitement thermique à plusieurs chambres
FR3073937B1 (fr) * 2017-11-21 2020-08-14 Ceritherm Installation de traitement thermique pour la fabrication de produits industriels.
DE102022108513A1 (de) * 2021-04-16 2022-10-20 Aerospace Transmission Technologies GmbH Steuereinrichtung und Verfahren zur Steuerung einer Anlage und eines Prozesses zur Wärmebehandlung von metallischen Werkstücken
CN116121504B (zh) * 2023-02-21 2023-09-22 北京中孚悦达真空科技有限公司 一种立式真空水淬炉

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088995A1 (fr) * 1982-03-13 1983-09-21 Ruhrgas Aktiengesellschaft Four à sole tournante
GB2162208A (en) * 1984-07-20 1986-01-29 Ipsen Ind Int Gmbh Heat treatment of metal workpieces
WO1986002103A1 (fr) * 1984-09-27 1986-04-10 Ab Volvo Procede et appareil de traitement thermique de pieces a usiner
EP0198871A1 (fr) * 1984-10-02 1986-10-29 Volvo Ab Procede et appareil de traitement thermique, de preference la cementation.
DE8711235U1 (de) * 1987-08-18 1987-10-22 Ruhrgas Ag, 4300 Essen Industrie-Ofenkombination mit zwei hintereinander angeorneten Behandlungsöfen
FR2617953A2 (fr) * 1982-04-27 1989-01-13 Innovatique Sa Four a sole tournante pour le traitement thermique, thermochimique ou electrothermique de metaux sous atmosphere rarefiee ou controlee
US4938458A (en) * 1988-12-22 1990-07-03 Chugai Ro Co., Ltd. Continuous ion-carburizing and quenching system
DE4005956C1 (fr) * 1990-02-26 1991-06-06 Siegfried Dipl.-Ing. Dr. 5135 Selfkant De Straemke
US5143558A (en) * 1991-03-11 1992-09-01 Thermo Process Systems Inc. Method of heat treating metal parts in an integrated continuous and batch furnace system
EP0530513A1 (fr) * 1991-08-09 1993-03-10 Caterpillar Inc. Système de four de traitement thermique pour réaliser des procédés différents et simultanés de carburation

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088995A1 (fr) * 1982-03-13 1983-09-21 Ruhrgas Aktiengesellschaft Four à sole tournante
FR2617953A2 (fr) * 1982-04-27 1989-01-13 Innovatique Sa Four a sole tournante pour le traitement thermique, thermochimique ou electrothermique de metaux sous atmosphere rarefiee ou controlee
GB2162208A (en) * 1984-07-20 1986-01-29 Ipsen Ind Int Gmbh Heat treatment of metal workpieces
WO1986002103A1 (fr) * 1984-09-27 1986-04-10 Ab Volvo Procede et appareil de traitement thermique de pieces a usiner
EP0198871A1 (fr) * 1984-10-02 1986-10-29 Volvo Ab Procede et appareil de traitement thermique, de preference la cementation.
DE8711235U1 (de) * 1987-08-18 1987-10-22 Ruhrgas Ag, 4300 Essen Industrie-Ofenkombination mit zwei hintereinander angeorneten Behandlungsöfen
US4938458A (en) * 1988-12-22 1990-07-03 Chugai Ro Co., Ltd. Continuous ion-carburizing and quenching system
DE4005956C1 (fr) * 1990-02-26 1991-06-06 Siegfried Dipl.-Ing. Dr. 5135 Selfkant De Straemke
US5143558A (en) * 1991-03-11 1992-09-01 Thermo Process Systems Inc. Method of heat treating metal parts in an integrated continuous and batch furnace system
EP0530513A1 (fr) * 1991-08-09 1993-03-10 Caterpillar Inc. Système de four de traitement thermique pour réaliser des procédés différents et simultanés de carburation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0811697A2 (fr) * 1996-06-06 1997-12-10 Dowa Mining Co., Ltd. Procédé et dispositif pour la carburation, la trempe et le revenu
EP0811697A3 (fr) * 1996-06-06 1999-01-27 Dowa Mining Co., Ltd. Procédé et dispositif pour la carburation, la trempe et le revenu
WO2003081156A1 (fr) * 2002-03-27 2003-10-02 Loi Thermprocess Gmbh Installation pour le traitement thermique de pieces a usiner
KR100964994B1 (ko) * 2002-03-27 2010-06-21 로이 섬프로세스 게엠베하 부품 열처리용 장치
EP2717008A3 (fr) * 2012-10-08 2017-08-23 Ipsen International GmbH Four industriel étanche au gaz de protection, notamment four à chambre, four poussant, four à sole tournante ou four à sole annulaire
WO2014170022A1 (fr) * 2013-04-17 2014-10-23 Ald Vacuum Technologies Gmbh Procédé et dispositif de durcissement thermochimique de pièces
RU2687385C2 (ru) * 2013-04-17 2019-05-13 Альд Вакуум Текнолоджиз Гмбх Способ и устройство для термохимического упрочнения деталей
US10626490B2 (en) 2013-04-17 2020-04-21 Ald Vacuum Technologies Gmbh Process and apparatus for thermochemically hardening workpieces
EP3054019A1 (fr) 2015-02-04 2016-08-10 Seco/Warwick S.A. Four à chambres multiples de cémentation sous vide et par trempe d'engrenages, d'arbres, d'anneaux et de pièces similaires
CN111424154A (zh) * 2020-05-12 2020-07-17 浙江三基钢管有限公司 一种可定量放料的加热炉
CN111424154B (zh) * 2020-05-12 2021-01-19 浙江三基钢管有限公司 一种可定量放料的加热炉

Also Published As

Publication number Publication date
DE29505496U1 (de) 1995-06-01
ES2141401T3 (es) 2000-03-16
DE59603946D1 (de) 2000-01-27
EP0735149B1 (fr) 1999-12-22
US5722825A (en) 1998-03-03
ATE187985T1 (de) 2000-01-15
CA2173058A1 (fr) 1996-10-01
JPH08285462A (ja) 1996-11-01

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