EP0684318A1 - Procédé et appareil de trempe de pièces au moyen d'une solution aqueuse de polymères - Google Patents

Procédé et appareil de trempe de pièces au moyen d'une solution aqueuse de polymères Download PDF

Info

Publication number
EP0684318A1
EP0684318A1 EP94118826A EP94118826A EP0684318A1 EP 0684318 A1 EP0684318 A1 EP 0684318A1 EP 94118826 A EP94118826 A EP 94118826A EP 94118826 A EP94118826 A EP 94118826A EP 0684318 A1 EP0684318 A1 EP 0684318A1
Authority
EP
European Patent Office
Prior art keywords
quenching
container
workpieces
liquid
storage tank
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.)
Withdrawn
Application number
EP94118826A
Other languages
German (de)
English (en)
Inventor
Albrecht Dr.-Ing. Melber
Friedrich Dr.-Ing. Preisser
André Dipl.-Ing. Mulot
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.)
Leybold Durferrit GmbH
Original Assignee
Leybold Durferrit 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 Leybold Durferrit GmbH filed Critical Leybold Durferrit GmbH
Publication of EP0684318A1 publication Critical patent/EP0684318A1/fr
Withdrawn legal-status Critical Current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
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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
    • C21D1/60—Aqueous agents
    • 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
    • C21D1/63—Quenching devices for bath quenching
    • C21D1/64—Quenching devices for bath quenching with circulating liquids

Definitions

  • the invention relates to a method for quenching workpieces, in particular for hardening steels and steel alloys, using an aqueous quenching liquid, in particular using an aqueous solution of at least one polymer, at least from the group of polyalkylene glycols (PAG), modified polyalkylene glycols, polyacrylates (ACR ), of polyvinylpyrrolidone (PVP), by reactive immersion in a quenching tank
  • PAG polyalkylene glycols
  • ACR polyacrylates
  • PVP polyvinylpyrrolidone
  • Polymer solutions as quenching liquids have a number of advantages over quenching oil: they are inexpensive, non-flammable, do not produce smoke when quenched, do not require complicated cleaning processes for workpieces that produce emulsions, and do not cause the soil contamination that can be observed when quenching with hard oils Environment of the hardening furnaces.
  • the aqueous polymer solutions have the disadvantage that at the usual operating temperatures of the quench baths, which are between about 30 and 60 ° C, considerable amounts of water vapor are released, which have the tendency to penetrate into the furnace chamber and any pre-chamber. In such a case, corrosion of functionally essential furnace parts is the result, if appropriate protective measures are not taken by costly measures such as the use of stainless steel.
  • the quenching tank is arranged under the furnace or its pre-chamber and surrounded concentrically by a storage tank, the quenching liquid in the quenching tank and in the storage tank being of the same height due to the principle of the communicating tubes.
  • the quenching tank is usually open at the top.
  • a long vertical shaft is arranged between the quenching container and the furnace chamber, which is surrounded by a cooling jacket above the quenching area in order to condense the water vapor. Above this cooling jacket there is a suction opening for uncondensed vapors.
  • the invention is therefore based on the object of specifying a quenching method of the type described at the outset, in which all the advantages of quenching by aqueous solutions of polymeric substances are retained, but in which the furnace space and any antechambers are very effectively protected against the ingress of water vapor.
  • the object is achieved in that the quenching container is emptied into a storage tank outside the quenching phase.
  • the essence of the invention is therefore to store the polymer solution in an external tank and to fill it into the quenching tank only when the quenching process is to be carried out.
  • the quenching phase has a negligible duration compared to a conventional heat treatment phase.
  • carburizing the workpieces in a gas phase process takes between 240 and depending on the size of the workpieces and the degree of carburization of the workpiece surface 600 minutes, the deterrence itself, however, a maximum of only about 10 minutes, usually even less than 5 minutes.
  • the volume of the storage tank can be kept relatively small: For the quenching liquid, a volume is required that is approximately twice as large as the batch volume. For example, 10 liters of quenching liquid per kilogram of the batch are sufficient to carry out the quenching process.
  • the quenching phase can be carried out in the following ways: In a first method, the workpieces are lowered into the quenching container before flooding, and the quenching liquid is then conveyed into the quenching container at a predetermined speed.
  • the quenching tank is at least partially, but preferably up to a predetermined liquid level, filled with the quenching liquid before the workpieces are lowered, and the workpieces are then lowered into the quenching liquid at a predetermined speed.
  • the quenching process can be controlled in a very targeted manner, either by increasing the liquid level or by lowering the batch.
  • the workpieces are washed in the quenching tank with a washing liquid which consists of at least 90%, preferably at least 95%, water. In this way, the workpieces are already sufficiently cleaned from the quenching furnace.
  • the quenching liquid is passed through a filter in the quenching phase.
  • the wash water with the specified low polymer content can, for example, be used again to replenish the water content of the quenching liquid.
  • the invention also relates to a device for carrying out the method specified at the beginning.
  • this device is characterized in that the quenching container is assigned at least one storage tank with a feed pump for the quenching liquid.
  • the capacity of the at least one storage tank is a multiple of the capacity of the quenching container.
  • the quenching conditions can be influenced by the choice of a suitable polymer and / or by the choice of a suitable concentration of the polymer in the water.
  • quenching container is assigned two storage tanks for different quenching liquids.
  • different quenching liquids is understood to mean those which differ in the type of polymer or polymers and in the concentration of the polymer or polymers.
  • a feed pump being arranged in each of the circuits, preferably also at least one shut-off element in the form of a liquid valve.
  • 1 shows the lower part of a heat treatment furnace or its prechamber, from which or from which a batch 2 can be lowered into a quenching container 4 by means of a support member 3, which is only indicated schematically.
  • the quenching container 4 has in its interior a partition 5 surrounding the charge 2, through which the quenching container 4 is divided into an interior space 6 and an exterior space 7 surrounding it.
  • a riser pipe 9 is connected to the bottom 8 of the quenching container 4 in the middle thereof and a discharge pipe 10 is connected in the area of the outer space 7.
  • a perforated plate 11 is located between the bottom 8 and the batch 2 in order to even out the upward flow into the interior 6 indicated by arrows.
  • the quenching liquid flows down again over the edge of the partition 5 in the direction of the discharge line 10, as is indicated by further arrows.
  • the riser 9 two storage tanks 12 and 13 are connected, in which there are different quenching liquids 14 and 15, of which the quenching liquid 14 has, for example, a polymer concentration of 15% and the quenching liquid 15 has a polymer concentration of 30%.
  • the storage tanks 12 and 13 are usually not arranged one above the other, but next to one another; the graphic representation was chosen only for the sake of clarity.
  • the storage tank 12 is connected to the riser 9 via a feed pump 16 and a feed line 17, while a return line 18 leads back from the discharge line 10 to the storage tank 12.
  • a shut-off device 19 is arranged in the feed line 17, a shut-off device 20 and a filter 21 in the return line 18.
  • a first circuit is produced between the quenching container 4 and the storage tank 12 through the lines 9, 10, 17, 18. This circuit can be shut off by the shut-off devices 19 and 20.
  • the storage tank 13 is connected to the riser 9 via a feed pump 22 and a feed line 23, while the discharge line 10 is connected to the storage tank 13 via a return line 24.
  • a shut-off device 25 is located in the feed line 13, while a further shut-off device 26 and a filter 27 are located in the return line 24.
  • the lines 9, 10, 23, 24 also form a flow circuit between the quenching container 4 and the storage tank 13 in this case.
  • the two storage tanks 12 or 13 can optionally be connected to the quenching container 4.
  • the volume of the quenching tank is usually between about 1 and 2 m3, while the volume of the storage tanks 12 and 13 is usually about 10 m3.

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)
EP94118826A 1994-04-29 1994-11-30 Procédé et appareil de trempe de pièces au moyen d'une solution aqueuse de polymères Withdrawn EP0684318A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944415098 DE4415098C1 (de) 1994-04-29 1994-04-29 Verfahren und Vorrichtung zum Abschrecken von Werkstücken mittels einer wässrigen Polymerlösung
DE4415098 1994-04-29

Publications (1)

Publication Number Publication Date
EP0684318A1 true EP0684318A1 (fr) 1995-11-29

Family

ID=6516846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118826A Withdrawn EP0684318A1 (fr) 1994-04-29 1994-11-30 Procédé et appareil de trempe de pièces au moyen d'une solution aqueuse de polymères

Country Status (2)

Country Link
EP (1) EP0684318A1 (fr)
DE (1) DE4415098C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600479A1 (de) * 1996-01-09 1997-07-10 Daimler Benz Aerospace Airbus Wärmebehandlungsanlage zum Lösungsglühen von Aluminium-Legierungsbauteilen in der Luftfahrtindustrie
CN105183022A (zh) * 2015-10-10 2015-12-23 十堰双齐科技有限公司 一种对pag水基淬火介质现场浓度进行控制的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106244777B (zh) * 2016-07-29 2017-05-31 玉环县金泰机械锻造有限公司 一种锻件的淬火方法
CN108277332A (zh) * 2018-04-24 2018-07-13 郑伟杰 一种农业机械铸件淬火装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1583343B2 (de) * 1966-12-20 1973-04-12 Vorrichtung zum gluehen und abschrecken von gegenstaenden
DE2211286A1 (de) * 1972-03-09 1973-09-27 Aichelin Fa J Ofenanlage zur waermebehandlung von stahl und nichteisenmetallen
DE2500322A1 (de) * 1975-01-07 1976-07-08 Waldes Kohinoor Inc Verfahren und vorrichtung zur rueckgewinnung von haertesalz aus dem waschbad von haerteanlagen
US4251292A (en) * 1979-07-16 1981-02-17 Park Chemical Company Method for restoring molecular weight distribution of a polymeric quenchant
DE3028901A1 (de) * 1980-07-30 1982-02-25 Brown, Boveri & Cie Ag, 6800 Mannheim Vorrichtung zum abschrecken von auf einem chargentraggestell gestapeltem haertegut
EP0070347A1 (fr) * 1981-07-17 1983-01-26 Michel Spérisen, Equipements industriels Installation de traitement thermique
EP0221329A1 (fr) * 1985-10-31 1987-05-13 Aichelin GmbH Procédé et installation de trempe de produits recuits

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1583343B2 (de) * 1966-12-20 1973-04-12 Vorrichtung zum gluehen und abschrecken von gegenstaenden
DE2211286A1 (de) * 1972-03-09 1973-09-27 Aichelin Fa J Ofenanlage zur waermebehandlung von stahl und nichteisenmetallen
DE2500322A1 (de) * 1975-01-07 1976-07-08 Waldes Kohinoor Inc Verfahren und vorrichtung zur rueckgewinnung von haertesalz aus dem waschbad von haerteanlagen
US4251292A (en) * 1979-07-16 1981-02-17 Park Chemical Company Method for restoring molecular weight distribution of a polymeric quenchant
DE3028901A1 (de) * 1980-07-30 1982-02-25 Brown, Boveri & Cie Ag, 6800 Mannheim Vorrichtung zum abschrecken von auf einem chargentraggestell gestapeltem haertegut
EP0070347A1 (fr) * 1981-07-17 1983-01-26 Michel Spérisen, Equipements industriels Installation de traitement thermique
EP0221329A1 (fr) * 1985-10-31 1987-05-13 Aichelin GmbH Procédé et installation de trempe de produits recuits

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
G. E. TOTTEN ET AL.: "How to Effectively Use Polymer Quenchants", INDUSTRIAL HEATING, October 1991 (1991-10-01), PITTSBURGH, US, pages 37 - 41 *
J. ROBERTSHAW ET AL.: "Practical Experience with Polymer .....", HEAT TREATMENT OF METALS, no. 1, 1981, BIRMINGHAM, GB, pages 13 - 16 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600479A1 (de) * 1996-01-09 1997-07-10 Daimler Benz Aerospace Airbus Wärmebehandlungsanlage zum Lösungsglühen von Aluminium-Legierungsbauteilen in der Luftfahrtindustrie
US5837187A (en) * 1996-01-09 1998-11-17 Daimler-Benz Aerospace Airbus Gmbh Heat treatment apparatus for solution annealing aluminum alloy components
DE19600479C2 (de) * 1996-01-09 1999-12-09 Daimler Chrysler Aerospace Wärmebehandlungsanlage zum Lösungsglühen von Aluminium-Legierungsbauteilen in der Luftfahrtindustrie
CN105183022A (zh) * 2015-10-10 2015-12-23 十堰双齐科技有限公司 一种对pag水基淬火介质现场浓度进行控制的方法

Also Published As

Publication number Publication date
DE4415098C1 (de) 1995-09-07

Similar Documents

Publication Publication Date Title
EP0562250A1 (fr) Procédé et dispositif de trempe de pièces métalliques
DE69021644T2 (de) System und Vorrichtung zum kontinuierlichen/unterbrochenen Überziehen von Werkstücken durch Eintauchen der Werkstücke in ein Bad aus flüssigem metallischen Überzugsmaterial.
DE1204558B (de) Tauchvorrichtung zum UEberziehen von Gegenstaenden mit erhitzter Farbmasse
DE4415098C1 (de) Verfahren und Vorrichtung zum Abschrecken von Werkstücken mittels einer wässrigen Polymerlösung
DE1026079B (de) Duese zur Einfuehrung von Fluessigkeiten in eine Reaktionskammer
DE3037639C2 (de) Vorrichtung und Verfahren zum Abschrecken von Werkstücken aus Stahl in einem Flüssigkeits-, insbesondere Ölbad
EP1943364B1 (fr) Procédé et installation pour la transformation à sec d une structure de matériau de produits semi-finis
WO1989012111A1 (fr) Procede de traitement thermique de pieces a usiner metalliques
EP0621344B1 (fr) Trempe flexible et adaptive
DE102007029038A1 (de) Vakuumofen zur Wärmebehandlung von metallischen Werkstücken und Verfahren zu dessen Betrieb
DE1546176B1 (de) Vorrichtung zur behandlung von gegenstaenden in einem sieden den behandlungsbad
DE2439906C3 (de) Vorrichtung zum Abschrecken von auf einem Rost gestapeltem Härtegut
EP0374649B1 (fr) Procédé et appareil pour l'imprégnation ou le revêtement d'objets
DE2804387A1 (de) Entkohlungsvorrichtung
DE2338020A1 (de) Verfahren zum gesteuerten abkuehlen heisser gegenstaende mittels fluessigkeit oder fluessigkeiten
DE102020002812A1 (de) Verfahren zum Abbau von organischen Anteilen in Kühlkreisläufen von industriellen Anlagen und Kühlkreislauf für eine industrielle Anlage
DE1815867C3 (de) Kontinuierliches Verfahren zur Behandlung bestrahlter Kernbrennstoff-Elemente und Vorrichtung zur Durchführung des Verfahrens
DE4039310C2 (de) Behandlungsgefäß zum Behandeln von Metallschmelzen
DE2622551C3 (de) Einrichtung zum Härten von Werkstücken
DE2745725A1 (de) Waermebehandlungsanlage
DE3621789C1 (en) Installation for tempering metal parts in a continuous operation
AT508173B1 (de) Abschreck- oder abkühlvorrichtung
DE19755001C2 (de) Verfahren zum Härten von Härtegut
DE60217344T2 (de) Verfahren zum abschrecken von stahl mittels druckluft
DE69203788T2 (de) Stahlabkohlungsverfahren in einer Vakuumbehandlungskammer und Vakuumbehandlungskammer dafür.

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 DE FR IT

17P Request for examination filed

Effective date: 19951219

17Q First examination report despatched

Effective date: 19980608

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19981219