EP1167549A1 - Gasabschreckkammer - Google Patents

Gasabschreckkammer Download PDF

Info

Publication number
EP1167549A1
EP1167549A1 EP01410074A EP01410074A EP1167549A1 EP 1167549 A1 EP1167549 A1 EP 1167549A1 EP 01410074 A EP01410074 A EP 01410074A EP 01410074 A EP01410074 A EP 01410074A EP 1167549 A1 EP1167549 A1 EP 1167549A1
Authority
EP
European Patent Office
Prior art keywords
fluid
enclosure
gaseous fluid
gas
quenching
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Withdrawn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
EP01410074A
Other languages
English (en)
French (fr)
Inventor
Jean Massot
Laurent Pelissier
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.)
Etudes et Constructions Mecaniques SA
Original Assignee
Etudes et Constructions Mecaniques SA
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 Etudes et Constructions Mecaniques SA filed Critical Etudes et Constructions Mecaniques SA
Publication of EP1167549A1 publication Critical patent/EP1167549A1/de
Withdrawn legal-status Critical Current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
    • C21D1/56—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
    • C21D1/62—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
    • C21D1/74—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

Definitions

  • the present invention relates to the treatment of parts steel, and more particularly the hardening of parts which have undergone heat treatments, in particular case hardening, that is to say introduction of carbon into the surface of the parts in order to improve hardness.
  • a cementation treatment consists in subjecting the parts to be treated, in an airtight enclosure, alternating enrichment steps in the presence of a carburizing and diffusion stages under vacuum or under atmosphere neutral.
  • the respective durations of the enrichment and distribution as well as their number depend, in particular, on the carbon concentration and carburizing depth desired in the rooms, and these treatments are well known of technique.
  • An example of a low carburizing process pressure is described in French patent application No. 2678287 of the plaintiff.
  • Any cementation treatment is followed by at least one quenching step carried out either under oil or under gas.
  • a main purpose of quenching is to get cooling rapid hardened parts without altering the surface finish got.
  • Gas quenching is often preferred because it allows directly obtain clean case-hardened parts.
  • the invention also refers to carbonitriding whose only difference compared to the case hardening comes from enrichment gas used to which is generally added ammonia.
  • enrichment gas used to which is generally added ammonia The perfectly known result is the formation of nitride (instead of carbide for cementation) on the surface of the room. It will therefore be noted that all that will be explained below in relationship with case hardening also applies to carbonitriding.
  • the quenching treatment following cementation or carbonitriding must respect several constraints among which a rapid cooling of the room so as not to degrade its surface.
  • a rapid cooling of the room so as not to degrade its surface.
  • we must increase the mass flow rate of the gas i.e. increase the speed and / or static pressure of the gas tempering.
  • Quenching and case hardening treatments generally take place in treatment facilities thermal in batches in which, for performance reasons, loads or lots of parts to be treated are important (often several hundred kilos).
  • FIG. 1 shows, in a very sectional view schematic, a classic example of treatment cell 1 thermal of a cementation plant of the type to which it applies the present invention.
  • Cell 1 illustrated by Figure 1 is a mixed cell that can serve both heat a batch 2 of parts to be treated in a treatment of case hardening and subjecting this batch to hardening, that is to say a rapid cooling.
  • Cell 1 essentially comprises a waterproof external enclosure 3 (most often tubular for mechanical resistance issues to pressure differences between the outside and the inside of the enclosure) inside which is defined a heat treatment chamber 4 by appropriate walls, and which generally rests on the ground by via a base 10.
  • Heating elements 5 (for example, electrical resistive bars) are distributed at the interior of the processing chamber in which is the load 2.
  • the enclosure 3 Being a mixed cell, the enclosure 3 is equipped with a cooling turbine 6 which can be driven by a motor 7 so as to stir air or gas to inside the enclosure 3 during the quenching step.
  • bedroom 4 is equipped, by example in its upper and lower walls, of shutters thermal 8, mobile and intended to be closed for carburizing heat treatments and to be open during quenching treatments.
  • Turbine 6 sends air usually outside of room 4 to get him through a heat exchanger 9 interposed between the external walls of chamber 4 and the internal walls of enclosure 3. Gas from quench enters the treatment chamber 4 through the bottom of the enclosure and emerges at the turbine 6 placed in its top as illustrated by the arrows in figure 1. This is where of course an example of layout and other structures are also known; in particular the circulation of gas can be reversed. To simplify, the gas input-output in enclosure 3 were not shown.
  • FIG. 2 shows, in a very sectional view schematic, another known example of 1 ′ quenching cell which is here dedicated, that is to say which is only used for cooling cemented parts.
  • a cell 1 ' is, for example, provided in an online facility to receive 2 lots of parts to be treated having undergone, in neighboring cells, treatments carburizing or carbonitriding thermal.
  • the 1 'cell comprises, like cell 1 described above, essentially a sealed enclosure 3 inside which is placed the load 2 to be treated.
  • a quenching chamber 4 ' is defined by open walls, here permanently, above and at the bottom of the enclosure 3.
  • a motor 7 is intended to drive, by through its shaft 7 ', a turbine 6 responsible for sending air or gas to a heat exchanger 9 disposed between the outer wall of chamber 4 'and the inner wall of the enclosure 3.
  • the gas then follows the path indicated by the arrows in the figure 2 to enter the treatment chamber 4 'through the bottom of enclosure 3 and exit at the level of the turbine 6.
  • Others turbine types allow reverse gas flow.
  • the present invention applies more particularly quench cells as illustrated in Figures 1 and 2 where the gas recirculates on the load to be treated in circuit closed, heating up on contact with the load, then losing these calories through an exchanger.
  • Such cells are in particular used when the quenching gas is not air but a gas (for example, nitrogen or other neutral gas) which one wishes save the quantities used.
  • a disadvantage of these conventional processing cells is that the flow rates required for rapid quenching tire the motors which must turn at very high speeds to drive the turbines. For example, to obtain a quenching pressure of the order of 20 bars with a flow rate of approximately 5 m 3 / s, motors of a power greater than 100 kw are used which rotate at several thousand revolutions per minute. Such rotational speeds accelerate the wear of motors in particular, mechanical rolling parts.
  • the present invention aims to overcome the drawbacks known quenching and / or heat treatment cells.
  • the invention aims more particularly to avoid problems related to engine wear in the drive turbines of a thermal cooling cell.
  • the invention also aims to propose a solution which is compatible with closed circuit operation of the quenching cell, in particular, if the quenching gas used is not air and therefore must be preserved.
  • the invention further aims to preserve, even improve, the quenching speed.
  • the present invention provides a steel parts quenching cell by circulation of a gaseous fluid in a sealed enclosure, which comprises at least one static vacuum cleaner to organize the circulation of the fluid gas, the gaseous fluid present at the inlet of the vacuum cleaner static being at a pressure higher than the pressure atmospheric.
  • the circulation of pressurized air or gas in a cell 20 according to the invention is carried out from the vacuum cleaners statics 26 which inject the gas flow into the chamber 24 from where it comes out through the opening in the lower part and then circulates through the heat exchangers 9 to be re-aspirated by the flow multipliers 26.
  • static vacuum cleaners in a cell quenching of steel parts takes advantage of the fact that the enclosure 23 of the quenching cell is designed to support large pressure differences between outside and inside of the cell. So while static vacuums are conventionally used to accelerate a flow of ambient air by means of compressed air, the invention provides for using them for accelerate a gas flow inside the cell which is already at pressure above atmospheric pressure and use very high gas pressures as the inducing fluid.
  • An advantage of the present invention is that instead to impose an air flow by the speed of a motor, we use a source of compressed gas as well as flow multipliers. Therefore, for the same cooling rate, the compressor 27 motor runs slower than a turbine classic. Thanks to flow multipliers, we gain a coefficient of the order of 5 to 15 in gas flow in the cell.
  • the number of static vacuums 26 in a cell hardening depends, in particular, on the dimensions of the cell and the desired cooling rate.
  • the sizing of static vacuums and their number and distribution are at the scope of the skilled person from functional indications above data and the application to a cell of given temper.
  • the invention does not requires only slight modifications to a quench cell classic.
  • the invention can be implemented without modify the heat exchange network in a quenching cell and simply replacing the turbine and the motor with static vacuum cleaners, taking care of course to preserve the tightness of the enclosure.
  • the present invention is capable of various variants and modifications which will appear to the man of art.
  • the invention has been described in relationship with dedicated quenching cells, it will be noted that it applies to mixed cells of the type illustrated by Figure 1 where the quenching takes place in the same enclosure where place the heat treatment of carburizing or carbonitriding.
  • other static vacuum cleaners than those shown in example may be used provided that the essential characteristic of the invention which is to allow an acceleration, by means of a working gas, of the ambient gas of the cementation enclosure.
  • the quenching gases which can be used, for example, neutral gases such as nitrogen, helium, or hydrogen.

Landscapes

  • 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)
  • Furnace Details (AREA)
  • Heat Treatment Of Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
EP01410074A 2000-06-20 2001-06-20 Gasabschreckkammer Withdrawn EP1167549A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0007875 2000-06-20
FR0007875A FR2810340B1 (fr) 2000-06-20 2000-06-20 Cellule de trempe au gaz

Publications (1)

Publication Number Publication Date
EP1167549A1 true EP1167549A1 (de) 2002-01-02

Family

ID=8851458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01410074A Withdrawn EP1167549A1 (de) 2000-06-20 2001-06-20 Gasabschreckkammer

Country Status (7)

Country Link
US (1) US20020020948A1 (de)
EP (1) EP1167549A1 (de)
JP (1) JP2002097517A (de)
CN (1) CN1329175A (de)
BR (1) BR0102431A (de)
FR (1) FR2810340B1 (de)
MX (1) MXPA01006313A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2869046A1 (fr) * 2004-04-19 2005-10-21 Francis Pelissier Procede de trempe sous gaz
CN103627854A (zh) * 2013-12-12 2014-03-12 无锡透平叶片有限公司 用于汽轮机叶片热处理的风冷***
CN111647725A (zh) * 2020-07-06 2020-09-11 上海交通大学 一种发动机活塞的空气淬火***及方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0512184D0 (en) * 2005-06-15 2005-07-20 Rolls Royce Plc Method and apparatus for the treatment of a component
DE102005045783A1 (de) * 2005-09-23 2007-03-29 Sistem Teknik Endustriyel Elektronik Sistemler Sanayi Ve Ticaret Ltd. Sirketi Einkammer-Vakuumofen mit Wasserstoffabschreckung
US8820098B2 (en) * 2011-05-17 2014-09-02 Air Products And Chemicals, Inc. Method and apparatus for quenching of materials in vacuum furnace
CN102331196B (zh) * 2011-07-28 2012-11-21 无锡四方集团真空炉业有限公司 气冷真空炉用换热器
CN102690931A (zh) * 2012-05-21 2012-09-26 温州瑞明工业股份有限公司 定位定点式空气淬火装置及其使用方法
CN103643003A (zh) * 2013-08-27 2014-03-19 朱明耀 一种常压淬火炉及其淬火方法
PL228193B1 (pl) * 2014-10-06 2018-02-28 Seco/Warwick Społka Akcyjna Urzadzenie do jednostkowego hartowania czesci urzadzen technicznych
US10611115B2 (en) * 2015-05-29 2020-04-07 Koyo Thermo Systems Co., Ltd. Tank cooling device
CN106148883A (zh) * 2016-08-31 2016-11-23 潍坊丰东热处理有限公司 一种井式氮化炉内冷却***
JP7189115B2 (ja) * 2019-12-05 2022-12-13 株式会社日本テクノ ガス浸炭方法およびガス浸炭装置
KR102479344B1 (ko) * 2021-06-01 2022-12-21 에스지엔 주식회사 반도체 공정 가스를 저장한 가스실린더용 쿨링 재킷

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE681750C (de) * 1935-12-08 1939-09-30 Siemens Schuckertwerke Akt Ges Verfahren zur regelbaren Abkuehlung von Gluehoefen
DE732569C (de) * 1940-07-23 1943-03-06 Siemens Ag Verfahren zur regelbaren Abkuehlung von Gluehoefen
FR1537887A (fr) * 1967-07-18 1968-08-30 Procédé de recyclage de gaz
FR1557613A (de) * 1966-04-12 1969-02-21
EP0960949A1 (de) * 1998-05-29 1999-12-01 Etudes Et Constructions Mecaniques Gasabschreckkammer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE681750C (de) * 1935-12-08 1939-09-30 Siemens Schuckertwerke Akt Ges Verfahren zur regelbaren Abkuehlung von Gluehoefen
DE732569C (de) * 1940-07-23 1943-03-06 Siemens Ag Verfahren zur regelbaren Abkuehlung von Gluehoefen
FR1557613A (de) * 1966-04-12 1969-02-21
FR1537887A (fr) * 1967-07-18 1968-08-30 Procédé de recyclage de gaz
EP0960949A1 (de) * 1998-05-29 1999-12-01 Etudes Et Constructions Mecaniques Gasabschreckkammer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2869046A1 (fr) * 2004-04-19 2005-10-21 Francis Pelissier Procede de trempe sous gaz
CN103627854A (zh) * 2013-12-12 2014-03-12 无锡透平叶片有限公司 用于汽轮机叶片热处理的风冷***
CN103627854B (zh) * 2013-12-12 2015-10-14 无锡透平叶片有限公司 用于汽轮机叶片热处理的风冷***
CN111647725A (zh) * 2020-07-06 2020-09-11 上海交通大学 一种发动机活塞的空气淬火***及方法
CN111647725B (zh) * 2020-07-06 2021-07-30 上海交通大学 一种发动机活塞的空气淬火***及方法

Also Published As

Publication number Publication date
FR2810340A1 (fr) 2001-12-21
US20020020948A1 (en) 2002-02-21
FR2810340B1 (fr) 2003-03-14
MXPA01006313A (es) 2005-06-03
JP2002097517A (ja) 2002-04-02
CN1329175A (zh) 2002-01-02
BR0102431A (pt) 2002-02-19

Similar Documents

Publication Publication Date Title
EP1167549A1 (de) Gasabschreckkammer
EP1885904B1 (de) Niederdruckcarbonitrierverfahren und -vorrichtung
FR2557207A1 (fr) Systeme de refroidissement pour fournir un tampon d'air a un compartiment de palier
EP0795616B1 (de) Durchlaufglühverfahren von Metallband in verschiedenen Schutzgasen und Vorrichtung
FR2537999A1 (fr) Four de traitement thermique continu sous vide de pieces, a equipement de refroidissement des pieces par un gaz sous pression
EP0236639B1 (de) Automatische flexible Vorrichtung für die Durchführung schneller thermochemischer Behandlungen
EP2304060B1 (de) Verfahren und vorrichtung zur regelung der abkühlung und energierückgewinnung eines stahlbands in einer glüh- oder galvanisierungsstufe
FR3028530A1 (fr) Procede et installation de carbonitruration de piece(s) en acier sous basse pression et haute temperature
FR2681332A1 (fr) Procede et dispositif de cementation d'un acier dans une atmosphere a basse pression.
EP1101826A1 (de) Abschreckverfahren nach Niederdruck-Aufkohlung
EP1558770B1 (de) Atmosphärensteuerung bei der kontinuierlichen wärmebehandlung von metallbändern
FR3029938A1 (fr) Procede et four de carbonitruration a basse pression
EP1543170B1 (de) Verfahren zum schnellen abkühlen von werkstücken durch konvektiver und strahlungs-übertragung
FR2576916A1 (fr) Procede de formation en phase gazeuse constamment renouvelee, sous pression reduite, de revetements protecteurs sur des pieces en alliages refractaires, et dispositif pour sa mise en oeuvre
JP5548920B2 (ja) エッジ部を有するワークの浸炭方法
FR2863628A1 (fr) Dispositif de trempe de pieces en acier
WO2013011228A1 (fr) Procédé de refroidissement de pièces métalliques ayant subi un traitement de nitruration / nitrocarburation en bain de sel fondu, l'installation pour la mise en oeuvre du procédé et les pièces métalliques traitées
EP1404882B1 (de) Verfahren zum abschrecken von stahl mittels druckluft
FR3052197A1 (fr) Turbopompe, notamment pour moteur-fusee a ergols cryogeniques
FR2863629A1 (fr) Procede et dispositif de traitement physicochimique a chaud de pieces mecaniques
FR2796711A1 (fr) Procede et dispositif de refroidissement de bobines recuites dans un four cloche
FR2999607A1 (fr) Procede de traitement d'acier comprenant un pretraitement d'affinage du grain
BE461261A (de)
FR2719057A1 (fr) Procédé pour la nitruration à bsase pression d'une pièce métallique et four pour la mise en Óoeuvre dudit procédé.
WO2016124849A1 (fr) Installation de carbonitruration en série de pièce(s) en acier sous basse pression et haute température

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 BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

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: 20020703