EP0106077A1 - Verfahren und Vorrichtung zum Abschrecken von Bauteilen aus Eisen und Stahl in einem Flüssigkeitsbad - Google Patents

Verfahren und Vorrichtung zum Abschrecken von Bauteilen aus Eisen und Stahl in einem Flüssigkeitsbad Download PDF

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Publication number
EP0106077A1
EP0106077A1 EP83108362A EP83108362A EP0106077A1 EP 0106077 A1 EP0106077 A1 EP 0106077A1 EP 83108362 A EP83108362 A EP 83108362A EP 83108362 A EP83108362 A EP 83108362A EP 0106077 A1 EP0106077 A1 EP 0106077A1
Authority
EP
European Patent Office
Prior art keywords
liquid
quenching
bath
vacuum
degassing vessel
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Withdrawn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
EP83108362A
Other languages
German (de)
English (en)
French (fr)
Inventor
Helmut Ing-Grad. Lohse
Erwin Dipl.-Ing. Schumann
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.)
Evonik Operations GmbH
Original Assignee
Degussa 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 Degussa GmbH filed Critical Degussa GmbH
Publication of EP0106077A1 publication Critical patent/EP0106077A1/de
Withdrawn legal-status Critical Current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
    • C21D1/62—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
    • C21D1/34—Methods of heating
    • C21D1/44—Methods of heating in heat-treatment baths

Definitions

  • the invention relates to a method for quenching components made of iron and steel brought to austenitization temperatures by introducing them into liquid baths, in particular oil baths, outside a protective gas atmosphere or a vacuum.
  • the austenitizing furnace is operated under defined protective gas conditions.
  • the liquid is continuously degassed.
  • Quenching liquid is continuously drawn into a degassing vessel which is connected to a vacuum line, degassed there due to the reduced pressure and conveyed back into the liquid bath by means of a pump.
  • the level of pressure required in the degassing vessel depends on the condition of the quenching medium.
  • the foam can only be driven with a relatively low vacuum (around 200 mbar absolute) due to the excessive foaming. After a long period of degassing, the pressure can be reduced to 1 mbar absolute and lower.
  • Controlling the level of the quenching liquid in the degassing vessel advantageously ensures that the vessel cannot be pumped empty and that cavitation phenomena can occur on the pump.
  • the quenching of the components is preferably carried out in a device consisting essentially of a bath tank in which a degassing vessel is connected to the bath tank via a pipeline leading into the upper region of the bath liquid and via a further pipeline leading into the bottom region of the bath liquid is connected, which is kept under vacuum via a vacuum line.
  • the figure shows schematically an embodiment of a device for performing the method according to the invention.
  • the bath liquid (2) in the container (1) preferably a quenching oil; is sucked through a pipeline (3) into a degassing vessel (4) due to the negative pressure prevailing therein.
  • This degassing vessel (4) is connected to a vacuum line (8) a vacuum pump (9) is connected, which continuously evacuates the released gases from the degassing vessel (4).
  • the degassed liquid is pumped back through a further pipe (5) by a pump (6) into the bath tank (1).
  • the system is set so that the pump (6) always delivers more than is sucked in via the pipe (3).
  • the liquid level in the degassing vessel (4) is advantageously regulated by means of two level switches (10, 11) on the degassing vessel (4) and a solenoid valve (7) in a bypass line around the pump (6). If the liquid level drops below the lower level switch (10), the solenoid valve (7) opens, the pump (6) works in bypass mode and the degassing vessel (4) fills up again until the solenoid valve is reached when the upper level switch (11) is reached (7) is closed again.
  • the pressure in the degassing vessel (4) can be increased as desired via an air valve (12) by adding air to the vacuum line (8). This is necessary if the foam development is too strong in the initial phase of degassing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Heat Treatment Of Articles (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Steel (AREA)
EP83108362A 1982-09-23 1983-08-25 Verfahren und Vorrichtung zum Abschrecken von Bauteilen aus Eisen und Stahl in einem Flüssigkeitsbad Withdrawn EP0106077A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823235211 DE3235211A1 (de) 1982-09-23 1982-09-23 Verfahren und vorrichtung zum abschrecken von bauteilen aus eisen und stahl in einem fluessigkeitsbad
DE3235211 1982-09-23

Publications (1)

Publication Number Publication Date
EP0106077A1 true EP0106077A1 (de) 1984-04-25

Family

ID=6173947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108362A Withdrawn EP0106077A1 (de) 1982-09-23 1983-08-25 Verfahren und Vorrichtung zum Abschrecken von Bauteilen aus Eisen und Stahl in einem Flüssigkeitsbad

Country Status (5)

Country Link
EP (1) EP0106077A1 (cs)
JP (1) JPS5974215A (cs)
CS (1) CS235982B2 (cs)
DE (1) DE3235211A1 (cs)
PL (1) PL243723A1 (cs)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH554417A (fr) * 1972-08-01 1974-09-30 Delemont Sa Du Four Electr Procede et dispositif pour la regeneration de l'huile de trempe.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH554417A (fr) * 1972-08-01 1974-09-30 Delemont Sa Du Four Electr Procede et dispositif pour la regeneration de l'huile de trempe.

Also Published As

Publication number Publication date
JPS5974215A (ja) 1984-04-26
PL243723A1 (en) 1984-05-21
CS235982B2 (en) 1985-05-15
CS691583A2 (en) 1984-06-18
DE3235211A1 (de) 1984-03-29

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Legal Events

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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

17P Request for examination filed

Effective date: 19830825

AK Designated contracting states

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

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19850624

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LOHSE, HELMUT, ING-GRAD.

Inventor name: SCHUMANN, ERWIN, DIPL.-ING.