EP0690138A1 - Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé - Google Patents

Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé Download PDF

Info

Publication number
EP0690138A1
EP0690138A1 EP95104784A EP95104784A EP0690138A1 EP 0690138 A1 EP0690138 A1 EP 0690138A1 EP 95104784 A EP95104784 A EP 95104784A EP 95104784 A EP95104784 A EP 95104784A EP 0690138 A1 EP0690138 A1 EP 0690138A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
refrigerant
quenching
heat treatment
cooling
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
EP95104784A
Other languages
German (de)
English (en)
Other versions
EP0690138B1 (fr
Inventor
Paul Dipl.-Ing. Heilmann
Klaus Dr.-Ing. Löser
Friedrich Preisser
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.)
ALD Vacuum Technologies GmbH
Original Assignee
ALD Vacuum Technologies 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6521702&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0690138(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ALD Vacuum Technologies GmbH filed Critical ALD Vacuum Technologies GmbH
Publication of EP0690138A1 publication Critical patent/EP0690138A1/fr
Application granted granted Critical
Publication of EP0690138B1 publication Critical patent/EP0690138B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

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
    • C21D1/62—Quenching devices
    • 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
    • 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

Definitions

  • the invention relates to a method for quenching workpieces by gases in a heat treatment system and recooling the gases conveyed in the circuit on cooling surfaces in at least one heat exchanger.
  • the heat treatment of high-quality tools made of hot and cold work steels as well as high-performance high-speed steels is mainly carried out today in vacuum heat treatment plants with high-pressure gas quenching.
  • This technology necessarily leads to the use of high-pressure tanks for heat treatment and gas quenching, or heat treatment plants with large wall thicknesses.
  • the formation and sealing of the flange connections and the doors and covers of the heat treatment systems is particularly complex.
  • the level of quenching intensity that can be achieved is significantly influenced by the choice of gas type, gas pressure, gas velocity and gas temperature.
  • the level of the gas temperature influences the amount of heat to be dissipated from the batch and thus the quenching intensity via the heat transfer coefficient ⁇ and the driving temperature difference between the batch and quenching gas.
  • the level of the gas temperature is influenced, among other things, by the heat exchanger used to recool the quench gas.
  • the level of the gas outlet temperature behind the heat exchanger remains limited to an order of magnitude of around 30 to 50 ° C, even with optimum efficiency.
  • the invention is therefore based on the object of increasing the quenching intensity even with larger workpieces and / or batches.
  • the object is achieved in that the cooling surfaces of the at least one heat exchanger are cooled to temperatures below 0 ° C. by a refrigeration unit and a refrigerant.
  • cooling surfaces of the heat exchanger are cooled to temperatures below -1 ° C, preferably even below -40 ° C.
  • the lowering of the gas temperature results in a significant increase in the heat transfer coefficient, provided the same pressure, via the material parameters density, thermal conductivity, dynamic viscosity and specific heat capacity.
  • the cooling time can be shortened significantly by using the method according to the invention.
  • the method according to the invention now also enables a high quenching intensity to be achieved with larger workpieces and / or batches.
  • the quenching intensity can be increased considerably.
  • the quenching gas is passed in succession through at least one heat exchanger with conventional water cooling and at least one further heat exchanger with cooling by a refrigerant.
  • Such a measure makes it possible to cool the quenching gas emerging from the batch, which can briefly have temperatures of more than 400 ° C., in a first heat exchanger with water cooling to a temperature of 50 ° C. and to supply it to the second heat exchanger at this temperature, which is cooled by a refrigerant, whereby the temperature can be lowered to, for example, -50 ° C.
  • This very strongly cooled gas is then fed back to the batch to be quenched via a blower in the circuit, as a result of which the game is repeated and the batch temperature can be lowered very quickly.
  • a batch of several hundred kilograms can be cooled from an initial temperature of 1,000 ° C to a temperature of 200 ° C within only 3 minutes.
  • a refrigeration unit must be designed in terms of its size and performance so that the amount of heat can also be dissipated within the specified time.
  • a storage volume of an at least largely pressure-less stored second refrigerant is first cooled to a temperature below 0 ° C. using the refrigeration unit and a first refrigerant, and this second Refrigerant is passed through the at least one heat exchanger.
  • a cooling brine is advantageously used as the second refrigerant, i.e. a salt solution with a salt concentration such that freezing is reliably prevented.
  • a salt solution with a salt concentration such that freezing is reliably prevented.
  • another anti-freeze can be added to the water, e.g. monohydric and / or polyhydric alcohols.
  • the storage volume of the second refrigerant is advantageously chosen to be as large as possible, the necessary output of the refrigeration unit decreasing with increasing size of the storage volume.
  • the refrigerant in question can therefore absorb to a considerable extent the amount of heat dissipated during quenching. Since there is a sufficient time interval between the heat treatment and the quenching of successive batches, the refrigeration unit can cool the second refrigerant down to the required low temperature of, for example, -50 to -60 ° C. in the course of this time.
  • the invention also relates to a heat treatment system for quenching workpieces by gases with and with a heat treatment furnace at least one heat exchanger for recooling the gases conveyed in a circuit on cooling surfaces.
  • such a heat treatment system is characterized according to the invention in that the at least one heat exchanger is connected to a refrigeration unit.
  • At least one heat exchanger with a connected water circuit and at least one heat exchanger with a connected refrigerant circuit are connected in series in the flow direction of the quenching gas.
  • a particularly advantageous heat treatment system is characterized in the course of the further embodiment of the invention in that the refrigeration unit has an evaporator which is immersed in a storage tank for an at least largely pressure-less storable second refrigerant, and in that this storage tank is connected to at least one of the heat exchangers via a circuit line connected.
  • a particularly compact system results, according to yet another embodiment of the invention, in that the interior of the heat treatment furnace is divided into a batch area and a cooling area through which the quenching gas can flow in succession and that in the cooling area at least one heat exchanger for cooling water operation and at least one Heat exchangers for refrigerant operation are arranged.
  • the heat treatment system is divided into a heat treatment furnace and a quenching chamber, and if the at least one is directly or indirectly connected to the cooling unit connected heat exchanger is assigned exclusively to the quenching chamber.
  • FIGS. 1 to 4 Three exemplary embodiments of the subject matter of the invention are explained in more detail below with reference to FIGS. 1 to 4.
  • FIG. 1 shows a heat treatment system 1, the heat treatment furnace 1a of which is designed as a vacuum furnace. Its interior is divided into a batch area 2 and a cooling area 3. In the batch area 2 there is a batch 4, which consists of numerous workpieces and is surrounded by thermal insulation 5. This thermal insulation includes two movable flaps 6 and 7, which control a flow of cooling gas through the openings 8 and 9 in the sense of drawn flow arrows serve. The heating devices required for heating batch 4 are not shown for the sake of simplicity.
  • the batch area 2 is separated from the cooling area 3 by a wall 10, which belongs to the thermal insulation 5.
  • first heat exchanger 11 In the cooling area 3 there is a first heat exchanger 11 with first cooling surfaces 12, on the secondary side of which cooling water is conducted in a water circuit, of which only the circuit line 13 is indicated.
  • the two heat exchangers 11 and 14 are surrounded by a further heat insulation 17.
  • a fan 18 with a drive motor 19 the quenching gas can be guided in a circuit with the flaps 6 and 7 open in the sense of the flow arrows shown.
  • the refrigerant circuit with the circuit line 16 includes a refrigeration unit 20 which is of conventional construction and contains a compressor 21, a condenser 22 and a throttle device 23.
  • a conventional refrigerant is passed through the circuit line 16 through the second heat exchanger 14, the cooling surfaces 15 of which thereby form the wall surfaces of an evaporator, so that a strong heat removal is exerted on the quenching gas.
  • the mode of operation of the device according to FIG. 1 is as follows: Charge 4 is heated, for example, to a temperature of 1,000 ° C. During the quenching process, the fan 18 conveys cold quenching gas through the open upper flap 6 into the batch area 2, which acts as a heating chamber is trained. When flowing through the hot batch 4, the quenching gas heats up while cooling the batch. The quenching gas which has now been heated leaves the heating chamber through the open lower flap 7 and flows through the water-cooled first heat exchanger 11. The quenching gas cools to a temperature of approximately 50.degree. For further cooling, the gas now flows through the second heat exchanger 14, which is operated on the secondary side with the refrigerant already described as the cooling medium.
  • the quenching gas within the second heat exchanger 14 is cooled to approximately -50 ° C., and this cooled gas stream is guided by the blower 18 back into the batch area 2 and passed over the batch.
  • the cooling surfaces 15 of the second heat exchanger 14 form the evaporator of the refrigeration unit 20.
  • the refrigerant enters the second heat exchanger 14, for example at a temperature of -60 ° C.
  • the refrigerant evaporates by absorbing heat from the quenching gas flowing on the primary side. After exiting the heat exchanger 14 or from its evaporator, the refrigerant vapor is compressed by the compressor 21 and liquefied in the downstream condenser 22.
  • the refrigerant After throttling in the throttling device 23, the refrigerant re-enters the second heat exchanger 14. In this way it is possible to reduce the batch temperature from 1,000 ° C to 200 ° C within 3 minutes and thereby quench the batch.
  • the pressure of the refrigerant in the second heat exchanger 14 is approximately 30 bar here.
  • the heat treatment furnace 1a according to FIG. 2 is identical to that in FIG. 1, so that repetitions are unnecessary.
  • a storage container 24 is present, in which a second refrigerant 25, which can be stored without pressure and which, for example, consists of a salt solution or cooling brine, is accommodated, so that freezing within the temperature ranges sought here is excluded.
  • the storage container 24 is a pressureless container, which is, however, surrounded by strong thermal insulation 26 and has a relatively large volume in which, for example, several thousand liters of the refrigerant 25 can be accommodated.
  • the refrigeration unit 20 has an evaporator 27 through which a first refrigerant is passed.
  • the evaporator is immersed in the second refrigerant 25 already described, so that it is cooled to the required operating temperature of -50 to -60 ° C.
  • the storage tank 24 is connected to the second heat exchanger 14 via a circuit line consisting of the supply line 28 and the return line 29.
  • the second refrigerant 25 forms a type of buffer which, depending on the amount of refrigerant stored, heats up slightly during the quenching process of batch 4, but in the intervals between the individual quenching processes, however, by the refrigeration unit 20 is cooled down again.
  • the cooling time t in seconds is shown on the abscissa in FIG. 3, while the workpiece temperatures T are plotted in ° C. on the ordinate. These curves were determined for steel bolts with a diameter of 25 mm and in a helium atmosphere with a pressure of 20 bar.
  • each curve represents the mean gas temperature in batch area 2 of the heat treatment furnace. It can clearly be seen that the quenching rate or quenching intensity increases sharply with decreasing temperature of the quenching gas. Conversely, the cooling time t is reduced accordingly. Alloys can be quenched, especially by increasing the quenching rate by frozen gases, which can no longer be quenched sufficiently quickly with pure high-pressure gas quenching.
  • FIG. 4 shows a heat treatment system 30, which is designed as a clocked multi-chamber system and is equipped with four gas-tight lock valves S1, S2, S3 and S4.
  • the batch 4 is brought in by means of a charging carriage 32 and is pushed into a prechamber 33 with the lock valve S1 open.
  • the atmosphere and pressure in the pre-chamber 33 are adapted to the values in the heat treatment furnace 30a, in which the charge 4 introduced by the lock valve S2 is also surrounded here by thermal insulation 5 and a heating device 5a.
  • the parts 5c and 5d of the thermal insulation 5 located in the transport direction are movably connected to the lock valves S2 and S3.
  • the lock valve S3 is opened and the charge 4 is introduced into a quenching chamber 31.
  • the lock valve S3 is then closed.
  • the quenching chamber 31 is assigned at least one heat exchanger, not shown here, via which the quenching gas is circulated through the fan 18 and cooled to temperatures well below 0 ° C.
  • the quenching chamber 31 is brought to atmospheric pressure and the batch 4 is transported to the atmosphere on a further batch wagon 34 through the lock valve S4 which is then opened.
  • the temperature of the components in the heat treatment furnace 30a is at least largely maintained, and likewise the temperature in the quenching chamber 31 when a new batch is introduced corresponds at least largely to the low temperature level which at the end of the quenching process of the previous batch in in the quenching chamber.
  • very abrupt temperature changes and unnecessary energy losses are largely avoided, and the cooling unit is additionally relieved.

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)
  • Tunnel Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
EP95104784A 1994-06-28 1995-03-31 Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé Revoked EP0690138B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4422588 1994-06-28
DE4422588A DE4422588C2 (de) 1994-06-28 1994-06-28 Verfahren zum Abschrecken von Werkstücken durch Gase und Wärmebehandlungsanlage zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP0690138A1 true EP0690138A1 (fr) 1996-01-03
EP0690138B1 EP0690138B1 (fr) 2000-08-30

Family

ID=6521702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95104784A Revoked EP0690138B1 (fr) 1994-06-28 1995-03-31 Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé

Country Status (4)

Country Link
US (1) US5630322A (fr)
EP (1) EP0690138B1 (fr)
AT (1) ATE195979T1 (fr)
DE (2) DE4422588C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1617004A2 (fr) 2004-07-12 2006-01-18 Chicago Metallic Continental Système de plafond suspendu
WO2018024408A1 (fr) * 2016-08-01 2018-02-08 Bayerische Motoren Werke Aktiengesellschaft Dispositif de traitement thermique

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4435862C1 (de) * 1994-10-07 1995-08-24 Leybold Durferrit Gmbh Verfahren und Vorrichtung zum Abkühlen, insbesondere zum Abschrecken, von Werkstücken durch Gase
DE19747018A1 (de) * 1997-10-24 1999-04-29 Ald Vacuum Techn Gmbh Vorrichtung zur Wärmebehandlung von Werkstücken
DE19820083A1 (de) * 1998-05-06 1999-11-11 Ald Vacuum Techn Gmbh Verfahren zum Abschrecken von Werkstücken und Wärmebehandlungsanlage zur Durchführung des Verfahrens
EP1004779B1 (fr) * 1998-11-27 2005-06-29 Linde AG Procédé et dispositif pour l'alimentation et pour la récupération de gaz
DE19909316A1 (de) * 1999-03-03 2000-09-07 Linde Tech Gase Gmbh Wärmebehandlungsanlage
JP2000283500A (ja) * 1999-03-29 2000-10-13 Canon Inc 環境制御装置、半導体製造装置および検査・測定装置
DE19961208B4 (de) * 1999-12-18 2008-07-17 Air Liquide Deutschland Gmbh Vorrichtung und Verfahren zum Kühlen von Werkstücken mittels Gas
US6427470B1 (en) * 2001-02-05 2002-08-06 United Microelectronics Corp. Cooling system for reducing particles pollution
EP1810001A4 (fr) 2004-10-08 2008-08-27 Sdc Materials Llc Appareil et procede d'echantillonnage et de collecte de poudres s'ecoulant dans un flux de gaz
PL202005B1 (pl) * 2004-11-19 2009-05-29 Politechnika & Lstrok Odzka In Urządzenie do hartowania z zamkniętym obiegiem wodoru
US7598477B2 (en) * 2005-02-07 2009-10-06 Guy Smith Vacuum muffle quench furnace
DE102005053134A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Anlage zur trockenen Umwandlung eines Material-Gefüges von Halbzeugen
US7393421B2 (en) * 2006-04-10 2008-07-01 Gm Global Technology Operations, Inc. Method for in-die shaping and quenching of martensitic tubular body
WO2008140786A1 (fr) 2007-05-11 2008-11-20 Sdc Materials, Inc. Procédé et appareil de production de nanoparticules ultra-petites et uniformes
US8507401B1 (en) 2007-10-15 2013-08-13 SDCmaterials, Inc. Method and system for forming plug and play metal catalysts
USD627900S1 (en) 2008-05-07 2010-11-23 SDCmaterials, Inc. Glove box
US8803025B2 (en) 2009-12-15 2014-08-12 SDCmaterials, Inc. Non-plugging D.C. plasma gun
US8545652B1 (en) 2009-12-15 2013-10-01 SDCmaterials, Inc. Impact resistant material
US9149797B2 (en) 2009-12-15 2015-10-06 SDCmaterials, Inc. Catalyst production method and system
US9119309B1 (en) 2009-12-15 2015-08-25 SDCmaterials, Inc. In situ oxide removal, dispersal and drying
US9126191B2 (en) 2009-12-15 2015-09-08 SDCmaterials, Inc. Advanced catalysts for automotive applications
US8470112B1 (en) 2009-12-15 2013-06-25 SDCmaterials, Inc. Workflow for novel composite materials
US8652992B2 (en) 2009-12-15 2014-02-18 SDCmaterials, Inc. Pinning and affixing nano-active material
US8557727B2 (en) * 2009-12-15 2013-10-15 SDCmaterials, Inc. Method of forming a catalyst with inhibited mobility of nano-active material
US8669202B2 (en) 2011-02-23 2014-03-11 SDCmaterials, Inc. Wet chemical and plasma methods of forming stable PtPd catalysts
US8820098B2 (en) 2011-05-17 2014-09-02 Air Products And Chemicals, Inc. Method and apparatus for quenching of materials in vacuum furnace
EP2744590A4 (fr) 2011-08-19 2016-03-16 Sdcmaterials Inc Substrats recouverts destinés à être utilisés dans une catalyse et dans des convertisseurs catalytiques ainsi que procédés permettant de recouvrir des substrats avec des compositions de revêtement verso
US9511352B2 (en) 2012-11-21 2016-12-06 SDCmaterials, Inc. Three-way catalytic converter using nanoparticles
US9156025B2 (en) 2012-11-21 2015-10-13 SDCmaterials, Inc. Three-way catalytic converter using nanoparticles
CN103276157B (zh) * 2013-05-24 2014-10-08 乳山市黄海汽车配件有限公司 锻件热处理冷却装置及冷却方法
WO2015013545A1 (fr) 2013-07-25 2015-01-29 SDCmaterials, Inc. Revêtements catalytiques et substrats revêtus pour convertisseurs catalytiques
EP3068517A4 (fr) 2013-10-22 2017-07-05 SDCMaterials, Inc. Compositions pour régénérer des pièges à nox
EP3060335A4 (fr) 2013-10-22 2017-07-19 SDCMaterials, Inc. Conception de catalyseurs pour moteurs à combustion diesel de grande puissance
EP3119500A4 (fr) 2014-03-21 2017-12-13 SDC Materials, Inc. Compositions pour systèmes d'adsorption de nox passive (pna) et leurs procédés de fabrication et d'utilisation
DE102016201025A1 (de) * 2016-01-25 2017-07-27 Schwartz Gmbh Wärmebehandlungsverfahren und Wärmebehandlungsvorrichtung
DE102016202766A1 (de) * 2016-02-23 2017-08-24 Schwartz Gmbh Wärmebehandlungsverfahren und Wärmebehandlungsvorrichtung
CN116287654A (zh) * 2023-04-24 2023-06-23 山西富兴通重型环锻件有限公司 一种风电法兰环冷却设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184349A (en) * 1963-04-08 1965-05-18 Ovitron Corp Heat treatment of precision aluminum assemblies
GB1452062A (en) * 1972-10-10 1976-10-06 Boc International Ltd Metal treatment
EP0189759A1 (fr) * 1985-01-17 1986-08-06 Linde Aktiengesellschaft Procédé et appareil de traitement thermique de pièces
US5121903A (en) * 1991-03-11 1992-06-16 Vacuum Furnace Systems Corporation Quenching arrangement for a furnace
EP0562250A1 (fr) * 1992-03-17 1993-09-29 Joachim Dr.-Ing. Wünning Procédé et dispositif de trempe de pièces métalliques

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078392A (en) * 1976-12-29 1978-03-14 Borg-Warner Corporation Direct contact heat transfer system using magnetic fluids
US4643401A (en) * 1985-08-28 1987-02-17 Mg Industries Apparatus for cooling a vacuum furnace
US5152605A (en) * 1991-01-22 1992-10-06 Ushio Co., Ltd. Apparatus for making cooled concrete
US5105633A (en) * 1991-01-28 1992-04-21 Venturedyne, Ltd. Solvent recovery system with means for supplemental cooling

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184349A (en) * 1963-04-08 1965-05-18 Ovitron Corp Heat treatment of precision aluminum assemblies
GB1452062A (en) * 1972-10-10 1976-10-06 Boc International Ltd Metal treatment
EP0189759A1 (fr) * 1985-01-17 1986-08-06 Linde Aktiengesellschaft Procédé et appareil de traitement thermique de pièces
US5121903A (en) * 1991-03-11 1992-06-16 Vacuum Furnace Systems Corporation Quenching arrangement for a furnace
EP0562250A1 (fr) * 1992-03-17 1993-09-29 Joachim Dr.-Ing. Wünning Procédé et dispositif de trempe de pièces métalliques

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1617004A2 (fr) 2004-07-12 2006-01-18 Chicago Metallic Continental Système de plafond suspendu
WO2018024408A1 (fr) * 2016-08-01 2018-02-08 Bayerische Motoren Werke Aktiengesellschaft Dispositif de traitement thermique

Also Published As

Publication number Publication date
DE4422588C2 (de) 1999-09-23
ATE195979T1 (de) 2000-09-15
DE4422588C1 (de) 1995-06-22
EP0690138B1 (fr) 2000-08-30
US5630322A (en) 1997-05-20
DE59508672D1 (de) 2000-10-05

Similar Documents

Publication Publication Date Title
DE4422588C1 (de) Verfahren zum Abschrecken von Werkstücken durch Gase und Wärmebehandlungsanlage zur Durchführung des Verfahrens
DE4208485C2 (de) Verfahren und Vorrichtung zum Abschrecken metallischer Werkstücke
DE2555578C2 (de) Verfahren und Vorrichtung zum Abkühlen von Gegenständen oder Stoffen
DE3344768A1 (de) Vakuumdurchlaufofen
EP3132062A1 (fr) Procédé et dispositif de fabrication d'un feuillard d'acier
DE102005015450B3 (de) Verfahren sowie Vorrichtung zur Gasabschreckung
EP1767660B1 (fr) Procedé d'opération un four sous vide à seule chambre pour trempe en hydrogène
DE102006025737B4 (de) Vorrichtung zur Gasabschreckung von wärmebehandelten Bauteilen und Verfahren zur Durchführung einer Gasabschreckung
EP0574754A1 (fr) Turbine à gaz utilisant une machine à ondes de pression comme échangeur d'énergie
DE2061726A1 (de) Vorrichtung zur kontinuierlichen Wärmebehandlung von Bandstahl
DE3819803C1 (fr)
DE60317912T2 (de) Verfahren zum schnellen abkühlen von werkstücken durch konvektiver und strahlungs-übertragung
EP3925716B1 (fr) Procédé de durcissement à la presse des plaques déformables à chaud
DE102007029038A1 (de) Vakuumofen zur Wärmebehandlung von metallischen Werkstücken und Verfahren zu dessen Betrieb
EP1943364A1 (fr) Procédé et installation pour la transformation à sec d une structure de matériau de produits semi-finis
EP0189759B1 (fr) Procédé et appareil de traitement thermique de pièces
DE10038782C1 (de) Verfahren und Vorrichtung zum Abkühlen, insbesondere zum Abschrecken und Härten von metallischen Werkstücken
DE10224129B4 (de) Wärmebehandlungsanlage zum Betreiben einer solchen Anlage
EP0705907B1 (fr) Procédé et installation pour le refroidissement au gaz de pièces à usiner
EP0955384A2 (fr) Procédé de trempe à gaz de pièces à usiner et installation de traitement thermique pour la mise en oeuvre de ce procédé
EP0095704A2 (fr) Installation de climatisation pour véhicules à moteur, en particulier pour voitures de voyageurs
DE19853221A1 (de) Verfahren und Vorrichtung zur Abschreckung metallischer Werkstücke
DE10223715A1 (de) Vorrichtung und Verfahren zum Abkühlen
DE2461813C3 (de) Verfahren zum beschleunigten Abkühlen von Glühgut
DE202022100505U1 (de) Wärmebehandlungsvorrichtung

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 FR GB IT LI SE

17P Request for examination filed

Effective date: 19960508

17Q First examination report despatched

Effective date: 19981013

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

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

Owner name: ALD VACUUM TECHNOLOGIES AG

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 FR GB IT LI SE

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

Ref country code: LI

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

Effective date: 20000830

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 20000830

Ref country code: CH

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

Effective date: 20000830

REF Corresponds to:

Ref document number: 195979

Country of ref document: AT

Date of ref document: 20000915

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 59508672

Country of ref document: DE

Date of ref document: 20001005

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

Effective date: 20000914

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20001130

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

Ref country code: AT

Payment date: 20010207

Year of fee payment: 7

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

Ref country code: CH

Payment date: 20010216

Year of fee payment: 7

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: IPSEN INTERNATIONAL GMBH

Effective date: 20010530

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: FR

Payment date: 20020211

Year of fee payment: 8

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

Ref country code: GB

Payment date: 20020220

Year of fee payment: 8

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

Ref country code: DE

Payment date: 20020221

Year of fee payment: 8

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: 20020331

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 20021022

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state

Free format text: 20021022