EP3948130A1 - Four à sole tournante pour le traitement thermique de pièces ouvrées métalliques, et procédé de traitement thermique associé - Google Patents

Four à sole tournante pour le traitement thermique de pièces ouvrées métalliques, et procédé de traitement thermique associé

Info

Publication number
EP3948130A1
EP3948130A1 EP20715015.2A EP20715015A EP3948130A1 EP 3948130 A1 EP3948130 A1 EP 3948130A1 EP 20715015 A EP20715015 A EP 20715015A EP 3948130 A1 EP3948130 A1 EP 3948130A1
Authority
EP
European Patent Office
Prior art keywords
inner housing
heat treatment
nozzle
rotary hearth
furnace
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.)
Granted
Application number
EP20715015.2A
Other languages
German (de)
English (en)
Other versions
EP3948130B1 (fr
EP3948130C0 (fr
Inventor
Thomas Berrenberg
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.)
Schwartz GmbH
Original Assignee
Schwartz 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 Schwartz GmbH filed Critical Schwartz GmbH
Publication of EP3948130A1 publication Critical patent/EP3948130A1/fr
Application granted granted Critical
Publication of EP3948130B1 publication Critical patent/EP3948130B1/fr
Publication of EP3948130C0 publication Critical patent/EP3948130C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • 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
    • 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
    • C21D9/0025—Supports; Baskets; Containers; Covers
    • 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
    • C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor
    • 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
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means

Definitions

  • Rotary hearth furnace for heat treatment of metallic workpieces and a corresponding method for heat treatment The present invention relates to a rotary hearth furnace for heat treatment of metallic workpieces, in particular for annealing metallic workpieces, and a corresponding method for heat treatment.
  • the present invention is based on the object to at least partially overcome the disadvantages known from the prior art and in particular a rotary hearth furnace and a method for heat treatment ment in a rotary hearth furnace in which a temporally and locally homogeneous heating of the workpieces takes place.
  • the rotary hearth furnace according to the invention for the heat treatment of metallic workpieces comprises an inner housing rotatable about an axis of rotation for the application of furnace gas to heat treatment locations, the inner housing having heat treatment locations radially on the outside for the workpieces which are non-rotatably connected to the inner housing and are located outside the inner housing , wherein the inner housing has nozzle devices through which furnace gas can be guided from the interior of the inner housing to the heat treatment locations and each heat treatment location is assigned a nozzle device which is non-rotatably connected to the inner housing, at least one flow machine being formed through which furnace gas is fed to at least one Heat source can be passed into the interior of the inner housing.
  • the inner housing is also known as the nozzle plenum.
  • the invention is thus based on a fixed assignment of the nozzle device to the heat treatment area and the rotationally fixed connection of the heat treatment area and the nozzle device with the rotatable inner housing.
  • the workpiece to be processed is placed on a heat treatment station and rotated of the inner housing passed through the rotary hearth furnace.
  • the nozzle device and the heat treatment station are in a constant relationship.
  • There is no relative movement between the nozzle device and the heat treatment station so that during the entire journey through the rotary hearth furnace, the workpiece can be constantly exposed to the heat treatment station, so that a significantly more homogeneous heating can take place compared to approaches known from the prior art .
  • the at least one heat source is preferably designed as a gas burner, in particular comprising a radiant tube or a flame guide tube and / or as an electrical heating element.
  • a radiant tube is understood to mean an element in which a gas burner burns in a closed housing and the smoke gases are discharged in such a way that they do not enter the inner housing.
  • a flame guide tube is preferably understood to mean a perforated metal tube in which the combustion exhaust gases of the gas burned in the gas burner are distributed outside the burner in a desired manner.
  • the furnace atmosphere can be used as furnace gas, which in particular comprises air and possibly combustion exhaust gas from a gas burner.
  • the atmosphere in the furnace is in particular circulated.
  • the rotary hearth furnace has at least one access opening through which workpieces can be inserted into or removed from the heat treatment stations.
  • the introduction of the heated furnace gas and thus the heat treatment through the nozzle devices can be continued uninterrupted during the loading and unloading.
  • the turbomachine generates an overpressure in the interior of the inner housing compared to the surroundings of the inner housing, which is used to flow through the nozzle devices the furnace gas from the inner housing through the nozzle devices to the heat treatment places.
  • the metallic workpieces are preferably workpieces made of aluminum, an aluminum-based alloy, a non-ferrous metal and / or a non-ferrous metal-based alloy.
  • the workpieces are preferably rims, engine blocks, chassis parts and the like for motor vehicles.
  • the rotary hearth furnace preferably has a gas return from the heat treatment stations to the turbo machine.
  • the at least one heat source in the gas recirculation is arranged on the suction side upstream of the turbo engine in order to bring about a uniform temperature control of the furnace gases.
  • the rotary hearth furnace is therefore preferably designed as a convection furnace.
  • the at least one heat source is formed in the gas return. This brings about a further equalization of the temperature of the furnace gas before it enters the réellege housing through the flow machine.
  • a ventila tor is designed as a flow machine.
  • a fan preferably an axial fan
  • Fan a semi-axial fan in which air is sucked in radially and blown out axially into the interior of the inner housing.
  • a flow equalizer for introducing the furnace gas into the inner housing in a distributive manner is formed downstream of the turbomachine.
  • a flow equalizer is designed, for example, as a tube into which the furnace gas flow from the fan flows inside and which leaves the tube via holes in the circumference of the tube.
  • the holes can vary in particular in size and shape, in particular special depending on the distance from the fan.
  • a tapering tube can preferably be used.
  • the holes are preferably designed so that there is a uniform flow out of the pipe over the length of the pipe.
  • each nozzle device has at least one first nozzle part device with a first blowing direction and a second nozzle part device with a second blowing direction, the first blowing direction and the second blowing direction including an angle different from zero.
  • first blowing direction and the second blowing direction are opposite to one another.
  • each nozzle device By dividing each nozzle device into at least two nozzle partial devices, it is possible to act on the workpiece from at least two sides, preferably also from three sides, by three nozzle partial devices.
  • the first partial nozzle device and the second partial nozzle device are preferably opposite one another.
  • Each nozzle dividing device preferably has at least one nozzle which is connected to the interior of the inner housing connected is. If several nozzles are formed per nozzle sub-device, the blowing direction is understood to be the vector sum of the exit directions of the individual nozzles.
  • the nozzle device comprises at least one nozzle and each nozzle sub-device comprises at least one nozzle.
  • the nozzle device is preferably designed in such a way that it comprises nozzles which can be blown into the workpiece from several sides, in particular from at least two sides.
  • the nozzle device can be designed such that the workpiece can be blown from above, below and from the side.
  • the number, position and / or type of nozzle for example with regard to the opening cross-section, the size of the opening and / or the blowing direction of the nozzle, is preferably adapted to the shape, the material and / or the mass of the workpiece.
  • At least two levels of heat treatment stations are formed which have different positions in the direction of the axis of rotation.
  • the rotary hearth furnace preferably has a level of heat treatment places which has a specific position in the direction of the axis of rotation. This can be particularly advantageous when comparatively tall workpieces are to be heat-treated. By forming two or more such levels, the number of workpieces to be treated at the same time can be increased and thus the throughput of the rotary hearth furnace can be increased.
  • a method for heat treatment of a metallic work piece in a rotary hearth furnace in particular a rotary hearth furnace according to the invention, is proposed in which the workpiece is moved in a heat treatment station with at least one nozzle device assigned to the heat treatment station on a circular path through the rotary hearth furnace and through the nozzle sen aptitude is acted upon with a furnace gas of a predetermined temperature.
  • the workpiece is transported through the rotary hearth furnace together with the nozzle device assigned to it in the heat treatment station.
  • the nozzle device assigned to it in the heat treatment station.
  • the workpiece is acted upon by the nozzle device from at least two directions with the furnace gas, be preferably from two opposite directions. In this way, even asymmetrical workpieces can be efficiently flown with furnace gas and thus temperature controlled.
  • the furnace gas is fed back.
  • the furnace gas is conducted past at least one heat source downstream of the heat treatment station and upstream of the nozzle device for setting the predefinable temperature.
  • the heat source is preferably a gas burner, in particular a radiant tube, and / or an electrical heating source.
  • first”, “second”, ...) primarily (only) serve to distinguish between several similar items, sizes or processes, so in particular no dependency and / or sequence of these items , Parameters or processes to each other. Should a dependency and / or sequence be required, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described embodiment.
  • FIG. 1 shows a first example of a rotary hearth furnace in longitudinal section
  • FIG 3 shows an example of a nozzle part device in a perspective view
  • FIG. 4 shows a second example of a rotary hearth furnace in longitudinal section.
  • Fig. 1 shows schematically a rotary hearth furnace 1 in longitudinal section.
  • the rotary hearth furnace 1 has a An inner housing 3 rotatable about an axis of rotation 2, which is formed in a static outer housing 4 with closable access openings 5.
  • the rotary hearth furnace 1 has several heat treatment stations 6, which are arranged in a first level 7 and a second level 8.
  • the heat treatment stations 6 are designed as supports or supports for workpieces 9.
  • the heat treatment stations 6 are non-rotatably connected to the inner housing 3.
  • the heat treatment stations 6 are formed from radially outside on the inner housing 3. The heat treatment stations 6 are thus outside the êtgephin ses 3 between the inner housing 3 and the outer housing 4.
  • the inner housing 3 has nozzle devices 10 through which the furnace gas 16 can be guided from the interior of the inner housing 3 to the heat treatment stations 6. For the sake of clarity, not all of the reference numerals of the nozzle devices 10 are executed.
  • a nozzle device 10, which is non-rotatably connected to the inner housing 3, is assigned to each heat treatment station 6.
  • each nozzle device 10 has a first nozzle sub-device 11 and a second nozzle sub-device 12, which are opposite one another and thus enable the workpiece 9 in the heat treatment station 6 to be applied from two directions (top and bottom in the present example).
  • at least one turbo machine 13 is formed, through which furnace gas 16 can be guided past at least one heat source 14 into the interior of the inner housing 3.
  • the heat sources 14 are formed as gas burners, preferably with a flame guide tube.
  • the rotary hearth furnace 1 is thus directly gas-heated.
  • the Strömma machine 13 is designed as a semi-axial fan. The furnace gas 16 flows from the interior 15 through the nozzle devices 11 or the nozzle sub-devices 11, 12 into the space between the inner housing 3 and the outer housing 4, the furnace gas 16 flowing around the workpieces 9.
  • the furnace gas 16 flows through a gas recirculation 17 in which the heat sources 14 are formed, which are circulated by the furnace gas 16, after which they are promoted by the Strö flow machine 17 back into the interior 15 of the inner housing 3 will.
  • the furnace gas 16 is circulated through the rotary hearth furnace 1.
  • the inner housing 3 is rotated by a drive 18.
  • FIG. 2 shows the rotary hearth furnace 1 from FIG. 1 in cross section. This has 8 work pieces 9, which are labeled I to VIII.
  • the rotation of the inner housing 3 relative to the outer housing 4 takes place about the axis of rotation 2 in the direction of rotation 19.
  • the inner housing 3 shows an example of a first partial nozzle device 11 in a perspective view.
  • the inner housing 3 has a heat treatment station 6 which comprises two holders 20.
  • the workpiece 9 (not shown) is placed on this.
  • the nozzle sub-device has four nozzles 21 which are aligned at an angle to the perpendicular of the inner housing 3 in this area.
  • a single nozzle 21 can also be formed.
  • the first partial nozzle devices 11 can be designed with a different number of nozzles 21 than the second partial nozzle devices 12.
  • Fig. 4 shows a second example of a rotary hearth furnace 1.
  • the rotary hearth furnace 1 here has a flow equalizer 22 for the distributing introduction of the furnace gas 16 into the interior 15 of the inner housing 3.
  • the flow equalizer 22 is designed as a tapering tube 23 with holes 24 through which the flow of the furnace gas 16 through the individual nozzle devices 10 with the first nozzle component device 11 and the second nozzle component device 12 is uniformized. For the sake of clarity, not all holes 24 are provided with reference symbols.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)

Abstract

L'invention concerne un four à sole tournante (1) destiné au traitement thermique de pièces ouvrées métalliques (9), comprenant un carter intérieur (3) pouvant tourner autour d'un axe de rotation (2) en vue d'alimenter des emplacements de traitement thermique (6) avec un gaz de four (16). Le carter intérieur (3) possède des emplacements de traitement thermique (6) radialement à l'extérieur pour les pièces ouvrées (9), lesquels sont reliés solidaires en rotation au carter intérieur (3) et se trouvent à l'extérieur du carter intérieur (3). Le carter intérieur (3) possède des dispositifs à buses (10) à travers lesquels du gaz de four (16) peut être amené de l'intérieur du carter intérieur (3) vers les emplacements de traitement thermique (6), et à chaque emplacement de traitement thermique (6) est associé un dispositif à buses (10) qui est relié solidaire en rotation au carter intérieur (3). Au moins une turbomachine (13) est formée, à travers laquelle du gaz de four (16) peut être amené à l'intérieur du carter intérieur (3) en passant devant au moins une source de chaleur (14).
EP20715015.2A 2019-04-04 2020-03-25 Four à sole tournante pour le traitement thermique de pièces ouvrées métalliques, et procédé de traitement thermique associé Active EP3948130B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019108873.9A DE102019108873A1 (de) 2019-04-04 2019-04-04 Drehherdofen zur Wärmebehandlung von metallischen Werkstücken und entsprechendes Verfahren zur Wärmebehandlung
PCT/EP2020/058377 WO2020200963A1 (fr) 2019-04-04 2020-03-25 Four à sole tournante pour le traitement thermique de pièces ouvrées métalliques, et procédé de traitement thermique associé

Publications (3)

Publication Number Publication Date
EP3948130A1 true EP3948130A1 (fr) 2022-02-09
EP3948130B1 EP3948130B1 (fr) 2024-05-29
EP3948130C0 EP3948130C0 (fr) 2024-05-29

Family

ID=70050103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20715015.2A Active EP3948130B1 (fr) 2019-04-04 2020-03-25 Four à sole tournante pour le traitement thermique de pièces ouvrées métalliques, et procédé de traitement thermique associé

Country Status (3)

Country Link
EP (1) EP3948130B1 (fr)
DE (1) DE102019108873A1 (fr)
WO (1) WO2020200963A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113817908B (zh) * 2021-08-13 2023-06-30 苏州新长光热能科技有限公司 一种退火炉

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3063878A (en) * 1958-05-07 1962-11-13 Wilson Lee Method of and apparatus for annealing
DE3231225A1 (de) * 1982-08-21 1984-03-01 Verwaltungsgesellschaft Heinrich Neitz GmbH & Co KG, 4930 Detmold Ofen zur waermebehandlung und durchfuehrung von waermeprozessen fuer werkstuecke aus eisenwerkstoffen und nichteisenmetallen
JPS60262924A (ja) * 1984-06-08 1985-12-26 Rozai Kogyo Kk 回転炉床式コイル加熱炉
WO2006021994A1 (fr) * 2004-08-25 2006-03-02 Nippon Furnace Kogyo Kaisha, Ltd. Four à circulation d'air chaud
US20060103059A1 (en) * 2004-10-29 2006-05-18 Crafton Scott P High pressure heat treatment system
JP4374377B2 (ja) * 2006-11-30 2009-12-02 ファーネス重工株式会社 熱風循環炉
JP5384226B2 (ja) * 2009-06-29 2014-01-08 三建産業株式会社 熱風加熱装置
US20140349240A1 (en) * 2012-02-08 2014-11-27 Shoei Mfg. Co., Ltd. Heat treatment furnace
DE102015203376A1 (de) * 2014-02-26 2015-08-27 Sms Siemag Ag Verfahren und Anlage zur thermischen Behandlung von langgestrecktem, flachem metallischen Gut, insbesondere Aluminium-Walzbarren, in einem Ringherdofen

Also Published As

Publication number Publication date
EP3948130B1 (fr) 2024-05-29
EP3948130C0 (fr) 2024-05-29
WO2020200963A1 (fr) 2020-10-08
DE102019108873A1 (de) 2020-10-08

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