EP1621840B1 - Four de traitement thermique à défilement - Google Patents

Four de traitement thermique à défilement Download PDF

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Publication number
EP1621840B1
EP1621840B1 EP05003003A EP05003003A EP1621840B1 EP 1621840 B1 EP1621840 B1 EP 1621840B1 EP 05003003 A EP05003003 A EP 05003003A EP 05003003 A EP05003003 A EP 05003003A EP 1621840 B1 EP1621840 B1 EP 1621840B1
Authority
EP
European Patent Office
Prior art keywords
conveyor belt
conveying direction
heating chamber
belt
bearing elements
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.)
Not-in-force
Application number
EP05003003A
Other languages
German (de)
English (en)
Other versions
EP1621840A1 (fr
Inventor
Ingo Dipl.-Ing. Cremer
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.)
Cremer Thermoprozessanlagen GmbH
Original Assignee
Cremer Thermoprozessanlagen 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 Cremer Thermoprozessanlagen GmbH filed Critical Cremer Thermoprozessanlagen GmbH
Publication of EP1621840A1 publication Critical patent/EP1621840A1/fr
Application granted granted Critical
Publication of EP1621840B1 publication Critical patent/EP1621840B1/fr
Not-in-force legal-status Critical Current
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
    • 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
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • 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
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/243—Endless-strand conveyor
    • 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
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone

Definitions

  • the invention relates to a continuous strip furnace for heat treatment of workpieces comprising a heating chamber and a cooling zone adjoining the heating chamber, wherein one strand of a conveyor belt is guided through the heating chamber along a conveyor belt support and the workpieces are transported by the conveyor belt through a high temperature zone in the heating chamber.
  • Such belt pass furnaces are known from the prior art. They are used in particular for sintering powder metallurgy products. Further, they are used for sintering, forging, reducing, oxidizing, calcining, brazing, annealing or tempering mass parts of metal.
  • the workpieces are preferably placed automatically in front of the kiln inlet on the upper run of the circulating conveyor belt, while the return strand outside the furnace is performed.
  • the workpieces to be subjected to the heat treatment are placed manually or automatically on the conveyor belt, which is guided along the conveyor belt support by the belt continuous furnace.
  • conveyor belts metal link belts, chain-like metal belts and wire mesh belts made of heat-resistant stainless steel are used.
  • the workpieces pass through a warm-up section, the high-temperature zone and the cooling section.
  • additional modules may be installed to improve the properties of the workpieces, such as a quick-cooling or tempering module.
  • Ofenein- and Ofenauslauf protective gas is supplied, so that the treated workpieces are surrounded by inert gas in the area in which they are exposed to the treatment temperatures.
  • a protective gas for example, hydrogen or nitrogen used, and reaction gases can be used instead of inert gas.
  • the heating of the ribbon continuous furnace in the heating chamber is preferably carried out electrically, for example with free-radiating chamber heaters or rod-shaped heating elements.
  • temperatures in the high-temperature zone above the maximum usual 1150 ° C for strip furnaces are advantageous in order to improve the properties of the workpieces.
  • Higher temperatures in the high temperature zone can not be realized economically in known belt furnaces because of the associated, extremely short service life of the conveyor belts.
  • a device for transporting metallic workpieces in heat ovens for stepwise forward movement of the workpieces wherein lifting webs, which are joined to endless guided over pulleys link belts that stand on stationary supporting structures lying workpieces by partially from the protrude upper longitudinal gap of the support structure, then transport the workpieces a part of the transport route and then settle again on the supporting structures.
  • the heating furnace can be operated in an economical manner with underfiring.
  • the link bands consisting of lifting webs are not comparable with a conveyor belt of a band continuous furnace.
  • the conveyor device comprises an elongated cooling chamber, an endless conveyor and drive means.
  • the elongated cooling chamber extends in the conveying direction within the furnace and has a groove-like depression for the endless conveyor.
  • the cooling chamber C-shaped in cross-section has an elongated upper opening which extends through the furnace in the longitudinal direction of the conveying path.
  • the endless conveyor has a plurality of receiving parts which extend upwardly through the elongated opening of the cooling chamber and support the workpiece.
  • the receiving parts are in turn connected to articulated interconnected portions of the endless conveyor.
  • the steel parts are not lifted by the receiving parts, but conveyed in the horizontal direction. In the case of horizontal transport, the sections of the Continuous conveyor guided by rollers that run in the groove-like depression within the cooling channel.
  • the invention is therefore an object of the invention to provide a strip continuous furnace of the type mentioned above, which allows higher temperatures in the high temperature zone with improved efficiency and / or longer strip life.
  • the use of conventional, metallic conveyor belts should remain possible.
  • the solution to this problem is based on the idea of eliminating the friction between the conveyor belt and the conveyor belt support, at least in the region of the high-temperature zone, and thereby minimizing the tension in the conveyor belt in the high-temperature zone.
  • a reduced tension allows a higher limit temperature and / or helps the conveyor to a longer life.
  • the measure according to the invention makes it possible to achieve higher limit temperatures of, for example, 1200 ° C. with conventional belt service life and belt load, a longer belt service life at conventional process temperature and belt load, or higher belt load at conventional process temperature and belt service life.
  • the simple system technology of strip furnaces can be maintained. This results in lower investment costs compared to other furnaces that allow process temperatures above 1150 ° C.
  • a structurally simple and effective support of the conveyor belt in the high-temperature zone is achieved when the conveyor belt support a set of first in and against the conveying direction of the conveyor belt movable support members and a set of second vertically movable support members, the supports of the first support elements a span parallel plane to the run of the conveyor belt and the supports of the second support members are movable above and below the level of this plane.
  • the support elements are in particular designed as ceramic beams whose longitudinal axes extend in the conveying direction.
  • Conventional conveyor belts designed as a link belt are regularly hinged exclusively transversely to the conveying direction.
  • the stable transverse rods arranged in the hinges are optimally supported by the bearing surfaces of the ceramic beams whose longitudinal axes extend at right angles to the transverse rods.
  • the first and second support elements are connected to a drive, which can be configured as a single or group drive. If the first and second support elements have a group drive, the power is transmitted to the first and second support elements via different gear members, which enable on the one hand the movement of the first support elements in and against the conveying direction of the conveyor belt and on the other hand, the vertical movement of the second support elements.
  • the alternative solution for a moving conveyor belt support according to claim 4 is that in the region of the high temperature zone below the guided through the heating chamber run of the conveyor belt a circulating support belt is arranged, wherein the conveying direction and belt speed of the conveyor belt with the direction of movement and belt speed of the support belt matches.
  • the circulating Support band is arranged only in the region of the high temperature zone of the belt continuous furnace, the problems usually occurring in ceramic conveyor belts due to a temperature gradient over the bandwidth, which occur especially in the range of lower temperatures to day, can be effectively avoided. A temperature gradient leads to damage of the ceramic material.
  • the continuous furnace consists essentially of a conveyor belt 1 having, endlessly circulating continuous conveyor, a heating chamber 2, a subsequent to the heating chamber in the conveying direction 3 cooling section 4 and a conveyor belt support 5 for guiding the upper run of the conveyor belt 1.
  • the heating chamber 2 On the input side, the heating chamber 2 an inlet 6 for the conveyor belt on.
  • At the end of the cooling section 3 is an outlet 7 for the conveyor belt.
  • the entire passage area of the upper strand of the conveyor belt 1 through the heating chamber 2 and cooling section 3 is encapsulated, so that a closed flow channel is formed.
  • the passage channel has at least one gas connection, not shown, for the supply of inert gas, wherein the inlet and outlet 6,7 are designed as inlet and outlet locks to reduce the shielding gas consumption.
  • the still escaping inert gas is ignited and flared at the inlet and / or outlet of the belt continuous furnace in a conventional manner.
  • the total of 5 designated conveyor belt support consists of a first set of beams 8 a-c are arranged in and against the conveying direction 3 of the conveyor belt 1 movable. Between the bars 8 a, b, c are two more bars 9 a, b, which are arranged to be movable in the vertical direction 11. To carry out the movement, the beams 8 a, b, c and 9 a, b are connected to a drive 12.
  • the pads 13 a, b, c of the beam 8 span a parallel plane to the upper run of the conveyor belt 1, wherein the supports 13 a and c are angled laterally to guide the upper run of the conveyor belt 1 at the edges.
  • the conveyor belt 1 are arranged transversely to the conveying direction 3 electrical heating elements 14, which are supplied via a passage 16 in the right side wall 15 of the heating chamber 2 with power. From the outside of the passage 16 is encapsulated by a channel 17. At the top, the heating chamber is closed by a removable furnace lid 18, which is removable for maintenance purposes.
  • a muffle 19 made of ceramic for indirect heating of the workpieces and to protect the workpieces from contamination.
  • the illustrated in Figure 2 total designated 5 movable conveyor belt extends at least over the region of the high temperature zone 21, which is downstream of the inlet 6, starting from a preheating zone 22 within the heating chamber 2.
  • temperatures are above 1120 ° Celsius.
  • the upper strand of the conveyor belt 1 is conventionally guided in sliding friction over a belt support, not shown.
  • the conveyor belt support 5 works as follows:
  • the conveyor belt 1 is moved clocked in the conveying direction 3.
  • the beams 8a, b, c of the first beam set rest against the underside of the conveyor belt 1 and are moved at the speed of the conveyor belt in the conveying direction 3 from an initial position to an end position.
  • the conveyor belt 1 is stopped and lifted by the lifting beams 9a, b from the position shown in FIG. 2, so that the underside of the belt is no longer resting on the beams 8a, b, c rests. Subsequently, the beams 8a, b, c are moved back against the conveying direction 3 into the starting position.
  • FIG. 3 illustrates the advantageous effects of the movable conveyor belt support 5 according to the invention compared to a conventional conveyor belt support.
  • the upper diagram shows the voltage curve in conventional belt conveyor ovens. It can be seen that the tension of the conveyor belt at the end of the high-temperature zone 21 reaches almost the permissible limit tension 25 of the conveyor belt 1. In the lower diagram, it can be seen that the belt tension in the high-temperature zone 21 is largely taken over by the conveyor belt support 5 moved with the conveyor belt, so that the belt tension is clearly below the maximum permissible limit tension 25.

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

Claims (9)

  1. Four de traitement thermique à défilement pour le traitement thermique de pièces usinées comprenant une chambre de chauffage et un parcours de refroidissement raccordé à la chambre de chauffage, un brin d'une bande de transport étant guidé à travers la chambre de chauffage le long d'une surface de contact de bande de transport et les pièces usinée étant transportées au moyen de la bande de transport à travers une zone de températures élevées dans la chambre de chauffage, caractérisé en ce que
    - la surface de contact de bande de transport est disposée au moins dans la zone de températures élevées (21) de la chambre de chauffage (2) dans la direction de transport (3) mobile simultanément avec la bande de transport (1) et
    - la surface de contact de bande de transport (5) présente un jeu de premiers éléments de transport (8) mobiles dans et à l'encontre de la direction de transport de la bande de transport et un jeu de seconds éléments de transport mobiles dans la direction verticale (9), les surfaces de contact (13) des premiers éléments porteurs (8) forment un premier plan parallèle par rapport au brin de la bande de transport (1) et les surfaces de contact des secondes éléments porteurs (9) étant mobiles au-dessus en en dessous du niveau de ce plan.
  2. Four de traitement thermique à défilement selon la revendication 1, caractérisé en ce que les premiers et secondes éléments (8, 9) sont réalisés comme des longerons dont les axes longitudinaux s'étendent dans la direction de transport (3).
  3. Four de traitement thermique à défilement selon la revendication 1 ou 2, caractérisé en ce que les premiers et secondes éléments (8, 9) sont reliés à un entraînement (12).
  4. Four de traitement thermique à défilement pour le traitement thermique de pièces usinées comprenant une chambre de chauffage et un parcours de refroidissement raccordé à la chambre de chauffage, un brin d'une bande de transport étant guidé à travers la chambre de chauffage le long d'une surface de contact de bande de transport et les pièces usinées étant transportées au moyen de la bande de transport à travers une zone de températures élevées dans la chambre de chauffage, caractérisé en ce que la surface de contact de bande de transport est disposée au moins dans la zone de températures élevées (21) de la chambre de chauffage (2) dans la direction de transport (3) mobile simultanément avec la bande de transport (1) dans laquelle est disposée une bande de soutien rotative en dessous du brin de la bande de transport (1) guidé à travers la chambre de chauffage (2)à proximité de la zone de températures élevées (21), la direction de transport (3) et la vitesse de la bande de transport (1) coïncidant avec la direction de déplacement et la vitesse de la bande de soutien.
  5. Four de traitement thermique à défilement selon l'une des revendications 1 à 4, caractérisé en ce que les premiers éléments porteurs (8, 9) ou la bande de soutien se composent d'un matériau hautement résistant à la température.
  6. Four de traitement thermique à défilement selon la revendication 5, caractérisé en ce que le matériau hautement résistant à la température est de la céramique.
  7. Four de traitement thermique à défilement selon l'une des revendications 1 à 6, caractérisé en ce que la bande de transport (1) est réalisée comme une bande articulée dont les articulations sont formées de charnières exclusivement transversalement à la direction de transport.
  8. Procédé pour la mie en service d'un four de traitement thermique à défilement selon l'une des revendications 1 à 3, caractérisé en ce que
    (a) la bande de transport (1) est déplacée de manière cadencée dans la direction de transport (3),
    (b) pendant le déplacement de la bande de transport (1) dans la direction de transport (3), les premiers éléments porteurs (8) mobiles dans et à l'encontre de la direction de transport sont déplacés à la vitesse de la bande de transport dans la direction de transport depuis une position de départ (23) dans une position de fin de course (24),
    (c) après l'arrêt dans la position de fin de course (24), la bande de transport (1) est soulevée par les seconds éléments porteurs (9) mobiles dans la direction verticale (11) au-dessus du niveau du plan formé par les surfaces de contact (13) des premiers éléments porteurs (8) et les premiers éléments porteurs (8) sont ramenés à l'encontre de la direction de transport (3) dans la position de sortie (23),
    (d) de sorte que les éléments porteurs (9) mobiles dans la direction verticale sont abaissés en dessous du niveau du plan formé par les surfaces de contact (13) des premiers éléments porteurs (8).
  9. Procédé selon la revendication 8, caractérisé en ce que la bande de transport (1) traverse plusieurs cycles de transport selon la revendication 8 du début (23) jusqu'à la fin (24) de la zone de températures élevées.
EP05003003A 2004-05-03 2005-02-12 Four de traitement thermique à défilement Not-in-force EP1621840B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004022047A DE102004022047B3 (de) 2004-05-03 2004-05-03 Banddurchlaufofen

Publications (2)

Publication Number Publication Date
EP1621840A1 EP1621840A1 (fr) 2006-02-01
EP1621840B1 true EP1621840B1 (fr) 2007-02-28

Family

ID=34813740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05003003A Not-in-force EP1621840B1 (fr) 2004-05-03 2005-02-12 Four de traitement thermique à défilement

Country Status (4)

Country Link
EP (1) EP1621840B1 (fr)
AT (1) ATE355501T1 (fr)
DE (2) DE102004022047B3 (fr)
ES (1) ES2279459T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027333B4 (de) * 2007-06-14 2016-07-14 Andreas Breloer Vorrichtung zur Wärmebehandlung von metallischen Platinen
DE102015112375A1 (de) 2015-07-29 2017-02-02 Gottfried Wilhelm Leibniz Universität Hannover Durchlaufofen und Verfahren zu dessen Betrieb
CN113528781B (zh) * 2021-01-25 2023-03-31 陈学森 一种履带式可控气氛钎焊热处理装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1161931B (de) * 1961-06-12 1964-01-30 Wistra Ofenbau Hubbalkenofen fuer die Waermebehandlung metallischen Gutes wie Eisen, Stahl u. dgl.
GB970807A (en) * 1963-09-17 1964-09-23 John Fallon Improvements relating to furnaces
FR1542530A (fr) * 1966-07-06 1968-10-18 Koppers Wistra Ofenbau Gmbh Installation pour le transport de pièces à usiner en métal, dans des fours de chauffage
DE1508420B1 (de) * 1966-10-24 1970-10-01 Wilhelm Krause Einrichtung zum Transportieren metallischer Werkstuecke in Waermoefen
JPH0593587A (ja) * 1991-10-03 1993-04-16 Saamotetsukusu:Kk 加熱炉

Also Published As

Publication number Publication date
EP1621840A1 (fr) 2006-02-01
DE102004022047B3 (de) 2005-09-01
ATE355501T1 (de) 2006-03-15
DE502005000417D1 (de) 2007-04-12
ES2279459T3 (es) 2007-08-16

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