EP1685355B1 - Installation pour le traitement thermique de pieces diverses - Google Patents

Installation pour le traitement thermique de pieces diverses Download PDF

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Publication number
EP1685355B1
EP1685355B1 EP04818802A EP04818802A EP1685355B1 EP 1685355 B1 EP1685355 B1 EP 1685355B1 EP 04818802 A EP04818802 A EP 04818802A EP 04818802 A EP04818802 A EP 04818802A EP 1685355 B1 EP1685355 B1 EP 1685355B1
Authority
EP
European Patent Office
Prior art keywords
workpieces
spaces
opening
rotation
heat
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
EP04818802A
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German (de)
English (en)
Other versions
EP1685355A2 (fr
Inventor
Salim-Phillip Afraz
Wolfgang Schalberger
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.)
LOI Thermprocess GmbH
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LOI Thermprocess GmbH
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Publication date
Application filed by LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Publication of EP1685355A2 publication Critical patent/EP1685355A2/fr
Application granted granted Critical
Publication of EP1685355B1 publication Critical patent/EP1685355B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • 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
    • F27B9/16—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 circular or arcuate 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
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types

Definitions

  • the invention relates to a plant for heat treating workpieces with a cyclically rotatable rotary hearth furnace, which has an outer and an inner wall defining a furnace space, with doors that divide the furnace chamber into a plurality of treatment zones, with a first and a second closable opening to Be - or unloading, wherein the openings are arranged in the outer wall and wherein each opening is associated with a transport device for the workpieces and a quenching device. Furthermore, the invention relates to a method for operating the plant for heat treating workpieces.
  • Such a plant which from the WO 03/081156 A1 is known and used for the hardening of workpieces, has two closable openings for loading and unloading in an outer wall.
  • a first opening is a first quenching device in the form of a hardening press and a second opening is preceded by a second quenching device in the form of a quenching bath. The latter is connected by a lock directly to the rotary hearth furnace.
  • the first opening is a first transport means in the form of a pusher and the second opening is associated with a second transport means in the form of a loading robot or manipulator.
  • the workpieces are heated in the rotary hearth furnace in several treatment zones, carburized and quenched in one of the quenching devices. Subsequently, the hardened workpieces are transported on a roller conveyor and enter a washer and a tempering furnace, in which the workpieces are released due to moderate heating of stress.
  • the rotary hearth furnace may be used for heating and carburizing first workpieces which are individually quenched in the first chill in the form of a hardening press.
  • the rotary hearth furnace may be used for heating and carburizing second workpieces that are quenched freely in quench baths and packed into batches that may be stored on batch carriers, e.g. As gratings or in baskets or similar containers. The flexibility in terms of applications is therefore limited.
  • an embodiment of the known system has the disadvantage that the furnace chamber, which are located in the direction of rotation between the two openings, can not be used for the heat treatment.
  • the object of the invention is therefore to develop a system of the type mentioned in such a way that the simultaneous heat treatment of various workpieces is made possible.
  • the installation is characterized in that the rotary hearth is divided in the direction of rotation into a plurality of defined first places for at least a first workpiece and second places for at least one second workpiece, wherein the first and second places alternate, that the first places are provided with internals , which are designed for heat storage, the heat capacity is at least 1.5 times the heat capacity of the first work, that extends between the openings in the direction of rotation at least one treatment zone, wherein the number of places in the treatment zone is a whole-part multiple of two and that Rotary hearth in the cyclical rotation about a delivery stroke to the length of at least two places in the direction of rotation is rotatable.
  • the length of each treatment zone must be at least two places or an integer multiple of two, for example four, six or eight, for two different types of workpieces.
  • the first places are provided with internals, which are designed for heat storage.
  • the heat capacity is at least 1.5 times the heat capacity of the first workpieces. If these fixtures remain permanently in the furnace chamber, they can store heat that can be delivered to the cold workpieces as soon as they are introduced into the furnace chamber. The fixtures thus serve as secondary heaters, which cause the workpieces are heated quickly and reduces the cycle time.
  • the system is characterized in that a third opening is arranged in the outer wall, wherein the third opening is associated with a transport device for the workpieces and a quenching device, wherein the rotary hearth in the direction of rotation in a plurality of defined first places for first workpieces, second places for second Workpieces and third places for third workpieces divided, with the first, second and third places alternate, that the first places (8) are provided with internals, which are designed for heat storage, whose heat capacity at least 1.5 times the heat capacity of the first workpieces is that extends between the openings in the direction of rotation at least one treatment zone, wherein the number of places in the treatment zone is a whole multiple of three, and that the rotary hearth in the cyclical rotation of a delivery stroke by the length of at least three places in Rotation is rotatable.
  • the first places are provided with internals whose carbon activity is substantially equal to 1.
  • the carbon availability is not reduced, because no carbon or soot precipitates on the heated internals.
  • the internals made of high temperature resistant ceramic, in particular SIC or carbon fiber amplifier ceramic. Ceramic has a low coefficient of expansion, so that the internals do not warp.
  • the invention is further characterized in that the second and / or the third opening is assigned a quenching device in the form of a quenching bath, wherein the quenching bath by means of a heatable lock, which is designed for temporary storage of workpieces, which is designed for temporary storage of workpieces, directly connected to the rotary kiln.
  • the invention offers the advantageous possibility that the quenching devices are followed by a common tempering furnace, each of which has a path for the first, second or optionally third workpieces.
  • the invention further provides a method, characterized in that at each cycle through each opening a workpiece is introduced into the furnace chamber and unloaded and that extends between the openings in the direction of rotation at least one treatment zone in which a heat exchange between the first, second during the heat treatment and possibly third workpieces takes place.
  • FIG. 1 schematically illustrated plant is used for case hardening, ie gas carburizing and hardening of various workpieces, such as crown wheels, which are quenched in a hardness press and drive bevel gears, which are quenched free in a quenching used.
  • the plant for heat treatment of workpieces has a rotary hearth furnace 1, which has a cyclically rotatable rotary hearth 2 and an outer and inner wall 3a, b, which delimit a furnace chamber 4, which is subdivided into a plurality of treatment zones 6a-d by means of vertically movable doors 5a-f ,
  • first closable opening 7 for loading and unloading of a plurality of first workpieces, in this case ring gears, which are quenched individually in a hardness press.
  • the first opening 7 is associated with a first transporting device 9 in the form of a loading robot or manipulator, with the aid of which the first workpieces are transported into and out of the furnace chamber 4.
  • the first opening 7 is preceded by a first quenching device 10 in the form of a hardening press in which the first workpieces are individually quenched.
  • a second opening 1.1 for loading and unloading of second workpieces, here drive bevel gears.
  • the second opening 11 is preceded by a second quenching device in the form of a quenching bath 13.
  • the latter is connected by means of a lock 14 directly to the rotary hearth furnace 1.
  • the second opening 11 is associated with a second transport device 15 in the form of a bumper. To the transport or. To shorten peak times, the lock 14 is heated and designed so that a batch or a rust can be stored in the lock.
  • the second workpieces 12 are quenched freely in the quench bath and are packaged into batches which are stored on batch carriers, e.g. As gratings or in baskets or similar containers.
  • the rotary hearth 2 of the rotary hearth furnace 1 is cyclically rotatable intermittently.
  • the rotary hearth moves only in one direction, in this case counterclockwise.
  • first places 8 for a plurality of first workpieces and second places 12 for a plurality of second workpieces 12 alternate in the direction of rotation.
  • the entire rotary hearth is divided into first 8 and second 12 places.
  • each delivery stroke of the rotary hearth according to the invention two places, d. H. a first place 8 with first workpieces and a second place 12 with second workpieces moved on.
  • the length of a delivery stroke thus corresponds to two places. This ensures that always arrive a first workpieces 8 in front of the first opening 7 and thus before the first quenching device and at the same time second workpieces 12 in front of the second opening 11 and accordingly before the second quenching device.
  • the length of each treatment zone must be at least two places or an integer multiple of two, for example four or six, for two different types of workpieces.
  • a third opening 20 must be present for loading and unloading.
  • the length of each treatment zone must be at least three places or an integer multiple of three, for example six or nine.
  • the treatment zones 6a-d each have defined temperatures and treatment atmospheres.
  • the workpieces in the treatment zones are heated in a known manner, with a mass transfer taking place.
  • the workpieces are cooled to the hardening temperature.
  • the carbon level contributes from 0.7% to 0.8% to achieve an edge carbon content in the workpieces at the same height.
  • the first places are provided with internals not shown in detail, which are designed for heat storage.
  • the internals have a large heat storage mass and in relation to the first workpieces a large heat capacity and at the same time behave neutral towards the carbon-containing treatment atmosphere, d. H. that their carbon activity is substantially equal to 1. If these installations remain permanently in the furnace chamber, they can store heat that can be radiated to the cold workpieces as soon as they are introduced into the furnace chamber. The internals thus serve as a secondary radiator. The heating of the workpieces is shortened by the radiant heat. At the same time, the carbon availability is not reduced, because no carbon or soot can precipitate on the heated internals.
  • the internals are made of high temperature resistant ceramic.
  • the internals can also serve for the storage of workpieces.
  • the internals are formed in this case as racks with several superposed trays for receiving workpieces. These racks form stackable modules that have closed walls and floors.
  • the first workpieces are stored individually.
  • the individual workpieces can also be located on support elements. These are, for example, gratings made of heat-resistant steel, on which the workpieces are loaded and unloaded.
  • the individual modules form a single free-standing batch of batches so that the oven zones can be separated from each other by the intermediate doors. If the batches of batches are installed in niches in the furnace lining, there is a simple way of separating the furnace zones.
  • the workpieces which are introduced through an opening in the furnace chamber, pass through this completely and are removed through the same opening.
  • the length of each treatment zone must be at least two different types of workpieces two places or an integer multiple of two, for example four or six. If three different types of workpieces are heat-treated at the same time, the length of a treatment zone must be at least three places or an integer multiple of three, for example six or nine.
  • a treatment zone 6a In the direction of rotation between the two openings 7 and 11 of the rotary hearth furnace 1 there is a treatment zone 6a. This acts as the first treatment zone for the first workpieces 8 and at the same time as the last treatment zone for the second workpieces 12, before the latter leave the furnace chamber through the opening 11.
  • a heat exchange takes place between the various workpieces in the first and second places.
  • Heat-storing fixtures on the squares for the first workpieces act as secondary heaters that emit heat. In this way, the simultaneous heat treatment of various workpieces in a single rotary hearth furnace is enabled, increases the cycle times and optimally utilized the furnace chamber.
  • the workpieces are quenched in one of the quenching devices. After quenching, the workpieces are conveyed on roller conveyors 16a, b and pass into a respective washer 17a, b and a common tempering furnace 18, in which the first and the second workpieces are freed of stresses due to moderate heating.
  • the tempering furnace 18 each have a web 19a, b for the first and the second workpieces.
  • the loading and unloading of the batches and the individual parts are sorted by the separate runways 16a, 16b.
  • the length of a delivery stroke corresponds to three places to ensure that all workpieces arrive in front of the opening through which they entered the oven.

Claims (8)

  1. Installation pour le traitement thermique de pièces diverses, avec un four à sole tournante (1) mobile en rotation par intermittence, qui présente une paroi extérieure et une paroi intérieure (3a, 3b) et une sole tournante, qui délimitent une chambre de four (4), avec des portes mobiles (5), qui subdivisent la chambre de four en plusieurs zones de traitement (6), avec une première et une deuxième ouvertures (7, 11) pouvant être fermées pour le chargement ou le déchargement, dans laquelle les ouvertures sont pratiquées dans la paroi extérieure (3a) et dans laquelle un dispositif de transport pour les pièces et un dispositif de trempe (10, 13) sont associés à chaque ouverture,
    caractérisée en ce que
    la sole tournante (1) est subdivisée dans la direction de rotation en plusieurs premières places définies (8) pour au moins une première pièce et plusieurs deuxièmes places définies (12) pour au moins une deuxième pièce, dans laquelle les premières et les deuxièmes places (8, 12) alternent, en ce que
    les premières places (8) sont garnies d'éléments, qui sont réalisés de façon à accumuler la chaleur, dont la capacité thermique vaut au moins 1,5 fois la capacité thermique des premières pièces, en ce que
    au moins une zone de traitement (6) s'étend dans la direction de rotation entre les ouvertures (7, 11), dans laquelle le nombre des places (8, 12) dans la zone de traitement (6) est un multiple entier de deux, et en ce que la sole tournante peut tourner, pendant la rotation intermittente, d'une course de transport de la longueur d'au moins deux places (8, 12) dans la direction de rotation.
  2. Installation pour le traitement thermique de pièces diverses,
    avec un four à sole tournante (1) mobile en rotation par intermittence, qui présente une paroi extérieure et une paroi intérieure (3a, 3b) et une sole tournante, qui délimitent une chambre de four (4), avec des portes mobiles (5), qui subdivisent la chambre de four en plusieurs zones de traitement (6), avec une première et une deuxième ouvertures (7, 11) pouvant être fermées pour le chargement ou le déchargement, dans laquelle les ouvertures sont pratiquées dans la paroi extérieure (3a) et dans laquelle un dispositif de transport pour les pièces et un dispositif de trempe (10, 13) sont associés à chaque ouverture,
    caractérisée en ce que
    une troisième ouverture est pratiquée dans la paroi extérieure (3a), dans laquelle un dispositif de transport pour les pièces et un dispositif de trempe sont associés à la troisième ouverture, en ce que
    la sole tournante est subdivisée dans la direction de rotation en plusieurs premières places définies (8) pour des premières pièces et plusieurs deuxièmes places définies (12) pour des deuxièmes pièces ainsi que plusieurs troisièmes places définies pour des troisièmes pièces, dans laquelle les premières, les deuxièmes et les troisièmes places (8, 12) alternent, en ce que
    les premières places (8) sont garnies d'éléments, qui sont réalisés de façon à accumuler la chaleur, dont la capacité thermique vaut au moins 1,5 fois la capacité thermique des premières pièces, en ce que
    au moins une zone de traitement (6) s'étend dans la direction de rotation entre les ouvertures (7, 11), dans laquelle le nombre des places (8, 12) dans la zone de traitement (6) est un multiple entier de trois, et en ce que la sole tournante peut tourner, pendant la rotation intermittente, d'une course de transport de la longueur d'au moins trois places (8, 12) dans la direction de rotation.
  3. Installation selon la revendication 1 ou 2, caractérisée en ce que les premières places (8) sont garnies d'éléments, dont l'activité du carbone est égale à 1.
  4. Installation selon la revendication 3, caractérisée en ce que les éléments sont composés de céramique résistant aux hautes températures.
  5. Installation selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les éléments sont réalisés en vue d'y déposer les pièces.
  6. Installation selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'un dispositif de trempe (13) sous la forme d'un bain de trempe est associé à la deuxième et/ou à la troisième ouverture (11), lequel est raccordé directement au four à sole tournante (1) au moyen d'un sas chauffant (14), qui est destiné au dépôt intermédiaire de pièces.
  7. Installation selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'un four de revenu commun (18) est installé après les dispositifs de trempe (10, 13), lequel présente une piste séparée respectivement pour les premières, les deuxièmes et éventuellement les troisièmes pièces.
  8. Procédé de conduite de l'installation selon l'une quelconque des revendications 1, 3 à 7 pour le traitement thermique de pièces diverses, caractérisé en ce qu'une pièce est introduite dans la chambre de four et déchargée hors de celle-ci à chaque pas à travers chaque ouverture, et en ce qu'au moins une zone de traitement s'étend dans le sens de la rotation entre les ouvertures, dans laquelle il se produit un échange de chaleur entre des premières, des deuxièmes et éventuellement des troisièmes pièces pendant le traitement thermique.
EP04818802A 2003-11-19 2004-11-18 Installation pour le traitement thermique de pieces diverses Not-in-force EP1685355B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10354138 2003-11-19
PCT/EP2004/013102 WO2005050112A2 (fr) 2003-11-19 2004-11-18 Installation et procede permettant de traiter thermiquement des pieces a usiner

Publications (2)

Publication Number Publication Date
EP1685355A2 EP1685355A2 (fr) 2006-08-02
EP1685355B1 true EP1685355B1 (fr) 2011-04-06

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EP04818802A Not-in-force EP1685355B1 (fr) 2003-11-19 2004-11-18 Installation pour le traitement thermique de pieces diverses

Country Status (4)

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EP (1) EP1685355B1 (fr)
AT (1) ATE504792T1 (fr)
DE (2) DE502004012382D1 (fr)
WO (1) WO2005050112A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103540943A (zh) * 2012-07-11 2014-01-29 洛伊热处理有限公司 装载和卸载热处理炉的设备和方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007048041A1 (de) * 2007-10-05 2009-04-09 Loi Thermprocess Gmbh Drehherdofen
DE102008006682A1 (de) * 2008-01-30 2009-08-13 Schuler Smg Gmbh & Co. Kg Drehofen
CN103276165B (zh) * 2013-06-07 2016-09-07 鞍钢股份有限公司 一种环形炉节能操作方法
DE102014004398A1 (de) * 2014-03-18 2015-09-24 Schuler Pressen Gmbh Drehofen
JP6900695B2 (ja) * 2017-02-09 2021-07-07 住友金属鉱山株式会社 金属酸化物の製錬方法
CN108775817A (zh) * 2018-07-27 2018-11-09 江苏凤谷节能科技有限公司 一种基于ω型回转窑和环形炉组合烧结粉体材料的方法

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
DE3209245A1 (de) * 1982-03-13 1983-09-15 Brown, Boveri & Cie Ag, 6800 Mannheim Drehherdofen
DE3427716C1 (de) * 1984-07-27 1985-11-14 Daimler-Benz Ag, 7000 Stuttgart Drehherdofen in Ringbauart zur Waermebehandlung von Werkstuecken
DE29716221U1 (de) * 1996-09-04 1997-11-20 Iob Ind Ofen Bau Gmbh Glühofen zur Wärmebehandlung metallischer Werkstücke
DE10310739A1 (de) * 2002-03-27 2003-10-09 Loi Thermprocess Gmbh Anlage zum Wärmebehandeln von Werkstücken

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103540943A (zh) * 2012-07-11 2014-01-29 洛伊热处理有限公司 装载和卸载热处理炉的设备和方法
CN103540943B (zh) * 2012-07-11 2017-03-01 洛伊热处理有限公司 装载和卸载热处理炉的设备和方法

Also Published As

Publication number Publication date
DE102004055808A1 (de) 2005-06-23
ATE504792T1 (de) 2011-04-15
EP1685355A2 (fr) 2006-08-02
DE502004012382D1 (de) 2011-05-19
WO2005050112A2 (fr) 2005-06-02
WO2005050112A3 (fr) 2005-08-04

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