EP0632842B1 - Procede de traitement thermique d'articles metalliques - Google Patents

Procede de traitement thermique d'articles metalliques Download PDF

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Publication number
EP0632842B1
EP0632842B1 EP93907835A EP93907835A EP0632842B1 EP 0632842 B1 EP0632842 B1 EP 0632842B1 EP 93907835 A EP93907835 A EP 93907835A EP 93907835 A EP93907835 A EP 93907835A EP 0632842 B1 EP0632842 B1 EP 0632842B1
Authority
EP
European Patent Office
Prior art keywords
zone
high temperature
articles
temperature zone
burners
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.)
Expired - Lifetime
Application number
EP93907835A
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German (de)
English (en)
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EP0632842A1 (fr
Inventor
Hans-Georg Bittner
Hartmut Weber
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.)
Heimsoth Verwaltungen & Co KG Beteiligungsge GmbH
Original Assignee
Heimsoth Verwaltungen & Co KG Beteiligungsgesellschaft GmbH
Heimsoth Verwaltungen GmbH and Co KG
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Application filed by Heimsoth Verwaltungen & Co KG Beteiligungsgesellschaft GmbH, Heimsoth Verwaltungen GmbH and Co KG filed Critical Heimsoth Verwaltungen & Co KG Beteiligungsgesellschaft GmbH
Publication of EP0632842A1 publication Critical patent/EP0632842A1/fr
Application granted granted Critical
Publication of EP0632842B1 publication Critical patent/EP0632842B1/fr
Anticipated expiration legal-status Critical
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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
    • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
    • 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
    • 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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/028—Multi-chamber type furnaces
    • 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
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices
    • F27B2009/3638—Heaters located above and under the track

Definitions

  • the invention relates to the heat treatment of metallic material in a roller furnace, in particular relatively thin steel parts, such as ball bearing rings, sheet metal blanks, knives and the like, which warp easily when heated.
  • a device for heat treating metallic material (DE-PS 31 50 576) is known, in which glow racks are arranged on a roller conveyor, which in turn have been fitted with the metallic parts in the individual compartments.
  • the glow racks equipped with the metallic material pass through an oven.
  • metal parts which have a longitudinal dimension in the cm range and a small thickness in the mm range, have not distorted after the heat treatment.
  • the invention is concerned with the problem of enabling heat treatment of metal parts in which the metal parts do not warp and only insignificant signs of edge decarburization or edge decarburization and insignificant edge oxidation or scale formation phenomena occur.
  • the temperature gradient immediately above the roller conveyor is so small that the metal parts located there cannot warp.
  • a temperature distribution can only be achieved with a one heated directly with high-speed burners Roller furnace can be reached.
  • this cannot be achieved in a roller oven with sole upper heating or when using annealing aids or annealing racks.
  • ceramic and carbon-free rollers are advantageously used according to the invention, which have sufficient heat resistance.
  • pittings do not occur since no contact of hot metal with hot metal occurs during the annealing process, but rather the steel parts rest on the ceramic rollers.
  • metal rollers are predominantly used, which is only possible if a relatively great effort is made for the air or water cooling of the rollers.
  • the burners are operated in the high temperature range, for example during heat treatment for hardening steel, the so-called austenitizing range, without excess air.
  • the burners are set in such a way that a protective gas can indeed be dispensed with.
  • metal parts of this type are easily scaled on the surface, with a layer thickness in the range of approximately 0.01-0.03 mm.
  • This edge scaling has no influence on the product quality, on the contrary, the scaling prevents the metal parts from carburizing or decarburizing, so that a uniform structure is achieved after the heat treatment and only an edge decarburization of approx. 0.01 - 0.03 mm occurs.
  • This slight decarburization or scaling is common Approved, as a rule, surface processing must be carried out in subsequent work steps.
  • the metal parts are conveyed through the roller furnace at different speeds.
  • the speed depends on the thickness of the metal material to be heat-treated, and when a temperature of approximately 850 ° C. is reached, the parts to be heat-treated are transported at a higher speed.
  • the residence time of the metals in the region of higher temperatures can be limited to a time period which does not permit any noticeable carburization or decarburization processes.
  • the metal parts are finally transported at an even higher speed. After passing through the high temperature zone, the hot material is removed from the oven very quickly.
  • baffles In the roller furnace for carrying out the method according to the present invention, no doors are required in the inlet and outlet, instead so-called baffles can also be used there, one or more baffles being located one behind the other at the outlet.
  • the oven can be heated up and down in a short time.
  • the temperature field directly above the rollers can be spatially constant in the method according to the invention, it is possible to treat metal parts with different dimensions at the same time, especially if the thickness of these parts is not significantly different.
  • the temperature can also be made more uniform by using pulse burners or high-speed burners which can be set with a constant gas-air mixture and can also be operated in a clocked manner.
  • the metal annealing furnace for carrying out the method according to the invention is divided into several zones which meet the following conditions:
  • the temperature of the goods should be brought as evenly as possible to approx. 800 - 850 ° C. Uniformity is important here, so this zone can also be divided into several areas, in each of which the temperature should be raised to a certain level.
  • the problem with thin and large round blanks is that the temperature outside takes on the temperature of the environment faster than inside. If the ambient temperature were now too high, this temperature would quickly set up on the outside, but this would not be the case on the inside and a considerable difference from inside to outside would result in the part being warped.
  • the slow increase in temperature also makes the structure of the metal part more uniform, so that a kind of stress relief annealing takes place. These are tensions that were present in the workpiece due to some pretreatment.
  • the next step is to reach the final temperature, which can be up to 1200 ... 1250 ° C for steel. It is important that this temperature is maintained as precisely as possible, for example with +/- 1 K or at most +/- 5 K. Changes in this temperature, which is to be kept as constant as possible, lead to changes in hardness and an undesired structure.
  • an atmosphere with free oxygen is used, whereas in the high-temperature zone there is no longer any free oxygen, but on the contrary, a reducing atmosphere, such as CO.
  • the temperature in the high temperature range can be kept constant with a small tolerance.
  • this arrangement of the rollers and roller chicanes below the roller conveyor enables a higher temperature (e.g. 20 K more) to be regulated to +/- 1K than above.
  • the invention is explained below with reference to the drawing, for example:
  • the single figure shows a diagrammatic longitudinal view of a roller furnace for carrying out the method according to the invention.
  • a roller furnace is shown schematically, the roller conveyor being clearly visible through the cross-sectional representation of the rollers.
  • the inlet is on the left and the outlet on the right, the direction of transport for the parts to be treated is indicated by an arrow.
  • the furnace consists of three spatially separated zones I, II and III.
  • zone I the unheated preheating zone, here the furnace gas is taken up and discharged via a chimney 10.
  • air is blown in via inlets 11 to set the temperature curve.
  • Zone III the high temperature zone, shows more burners than Zone II, the heated preheating zone.
  • a quick draw is located after the high temperature zone.
  • zone I the material to be heat-treated is warmed up - evenly from the inside out.
  • Zone II includes the further heating of the goods until the high temperature limit is reached.
  • zone III the metal parts finally reach the high-temperature range in which, for example, steel is subjected to austenitization.
  • the burners of zones II and III can be controlled in groups, above and below the roller conveyor, in order to obtain the desired temperature profile.
  • S is used to indicate height-adjustable chicanes in order to separate the individual zones from each other in terms of heat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Claims (1)

  1. Procédé pour le traitement thermique d'objets métalliques dans un four à rouleaux, en particulier de pièces métalliques relativement minces qui lors de leur échauffement se déforment légèrement, comme par exemple les bagues de roulements à billes, les ronds en tôle, les couteaux et autres, caractérisé en ce que les objets métalliques sont échauffés par paliers jusque dans le domaine de 800 à 850°C dans plusieurs zones de préchauffage (I, II) et sous une atmosphère d'oxygène libre, en ce qu'ensuite les objets sont chauffés dans une zone de température élevée (III) à atmosphère réductrice dépourvue d'oxygène libre, tout en parcourant rapidement cette zone, en ce que les brûleurs de la zone à haute température (III) sont rythmés plus ou moins en fonction de la quantité d'objets approvisionnée ou de la quantité de chaleur à transmettre, et en ce que dans la zone à haute température (III) les rouleaux sont réglés à une faible distance l'un de l'autre, tandis qu'entre les zones (I, II, III) les chicanes (S, US) sont réglées à des distances aussi petites que possible par rapport au chemin des rouleaux ou aux objets se trouvant sur ce chemin, les brûleurs se trouvant au-dessus ou en-dessous de ce dernier.
EP93907835A 1992-03-27 1993-03-26 Procede de traitement thermique d'articles metalliques Expired - Lifetime EP0632842B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4209978 1992-03-27
DE4209978 1992-03-27
PCT/EP1993/000741 WO1993020248A1 (fr) 1992-03-27 1993-03-26 Procede de traitement thermique d'articles metalliques

Publications (2)

Publication Number Publication Date
EP0632842A1 EP0632842A1 (fr) 1995-01-11
EP0632842B1 true EP0632842B1 (fr) 1995-11-02

Family

ID=6455156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93907835A Expired - Lifetime EP0632842B1 (fr) 1992-03-27 1993-03-26 Procede de traitement thermique d'articles metalliques

Country Status (7)

Country Link
US (1) US5456773A (fr)
EP (1) EP0632842B1 (fr)
JP (1) JP2771330B2 (fr)
AT (1) ATE129748T1 (fr)
DE (1) DE59300866D1 (fr)
ES (1) ES2082641T3 (fr)
WO (1) WO1993020248A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002058476A1 (fr) * 2001-01-05 2002-08-01 Elias Hakalehto Produit a base de lait, son utilisation et procede permettant de le produire

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4316795A1 (de) * 1993-05-19 1994-11-24 Heimsoth Verwaltungen Verfahren zur thermischen Vorbehandlung von metallischem Gut
ATE208430T1 (de) * 1995-04-13 2001-11-15 Patherm Sa Verfahren und vorrichtung zur wärmebehandlung von werkstücken
US5614039A (en) * 1995-09-29 1997-03-25 The Boc Group, Inc. Argon employing heat treating process
DE19856191C2 (de) * 1998-12-05 2001-02-15 Ald Aichelin Gmbh Anlage zur Wärmebehandlung von Teilen
EP1830147B1 (fr) * 2006-03-03 2012-04-11 Schwartz, Eva Four continu à chambres multiples avec atmosphère protectrice et procédé pour le chauffage de pièces galvanisées sans couche oxydée
CN101555544B (zh) * 2009-05-19 2011-03-09 佛山市中研非晶科技股份有限公司 在横向磁场下软磁卷绕铁心的热处理设备及方法
AT509596B1 (de) * 2010-06-04 2011-10-15 Ebner Ind Ofenbau Verfahren zum erwärmen eines formbauteils für ein anschliessendes presshärten sowie durchlaufofen zum bereichsweisen erwärmen eines auf eine vorgegebene temperatur vorgewärmten formbauteils auf eine höhere temperatur
DE102011053698C5 (de) 2011-09-16 2017-11-16 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung von Struktur- und Chassisbauteilen durch Warmformen und Erwärmungsstation
DE102012221120B4 (de) * 2012-11-19 2017-01-26 Kirchhoff Automotive Deutschland Gmbh Rollenherdofen und Verfahren zur Wärmebehandlung von metallischen Blechen
WO2014109241A1 (fr) * 2013-01-11 2014-07-17 フタバ産業株式会社 Dispositif de chauffage pour estampage à chaud
CN103922142B (zh) * 2014-04-26 2015-12-16 常州市新城光大热处理有限公司 自动轴承转运装置
CN104805265B (zh) * 2015-04-20 2017-01-04 烟台金光工具有限公司 锯条端头退火自动线
CN107034348B (zh) * 2017-05-10 2018-12-14 凯美家用品（青岛）股份有限公司 2cr13材质的西餐刀具热处理方法及其装置

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JPS5064113A (fr) * 1973-10-12 1975-05-31
FR2366621A1 (fr) * 1976-10-01 1978-04-28 Cii Honeywell Bull Systeme de traitement de donnees enregistrees
JPS5485123A (en) * 1977-12-20 1979-07-06 Nippon Steel Corp Manufacture of cold rolled steel sheet or steel sheet for surface treatment
JPS54110288A (en) * 1978-02-17 1979-08-29 Mitsui Toatsu Chem Inc Polymerization of propylene
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DE3150576C1 (de) * 1981-12-21 1982-12-09 Friedrich Wilhelm Dipl.-Ing. 7761 Moos Elhaus Vorrichtung zum Wärmebehandeln von metallischem Gut
JPS5929651A (ja) * 1982-08-11 1984-02-16 Asahi Chem Ind Co Ltd ポリメチレンポリフエニルカルバメ−ト類の製造方法
JPS61258415A (ja) * 1986-05-09 1986-11-15 Hitachi Ltd 半導体ウェ−ハ加熱処理方法
JPS63114924A (ja) * 1986-11-04 1988-05-19 Kawasaki Steel Corp 金属ストリツプの直火式焼鈍炉
ATE93310T1 (de) * 1988-05-14 1993-09-15 Wuenning Joachim Rollenherdofen zur waermebehandlung, insbesondere von kleinteilen aus metall und keramik.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002058476A1 (fr) * 2001-01-05 2002-08-01 Elias Hakalehto Produit a base de lait, son utilisation et procede permettant de le produire

Also Published As

Publication number Publication date
JP2771330B2 (ja) 1998-07-02
WO1993020248A1 (fr) 1993-10-14
EP0632842A1 (fr) 1995-01-11
DE59300866D1 (de) 1995-12-07
ES2082641T3 (es) 1996-03-16
JPH07500636A (ja) 1995-01-19
US5456773A (en) 1995-10-10
ATE129748T1 (de) 1995-11-15

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