EP1589120B1 - Procede et four pour traitement thermique - Google Patents

Procede et four pour traitement thermique Download PDF

Info

Publication number
EP1589120B1
EP1589120B1 EP03812311A EP03812311A EP1589120B1 EP 1589120 B1 EP1589120 B1 EP 1589120B1 EP 03812311 A EP03812311 A EP 03812311A EP 03812311 A EP03812311 A EP 03812311A EP 1589120 B1 EP1589120 B1 EP 1589120B1
Authority
EP
European Patent Office
Prior art keywords
chamber
heat treating
furnace
series
work
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
EP03812311A
Other languages
German (de)
English (en)
Japanese (ja)
Other versions
EP1589120A1 (fr
EP1589120A4 (fr
Inventor
Motokazu c/o Dowa Mining Co. Ltd. MURAKAMI
Hiroyoshi c/o Dowa Mining Co. Ltd. SUZUKI
Yoshiyuki c/o Dowa Mining Co. Ltd. TANNO
Masashi c/o Dowa Mining Co. Ltd. YAMAGUCHI
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.)
Dowa Thermotech Co Ltd
Original Assignee
Dowa Thermotech Co Ltd
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 Dowa Thermotech Co Ltd filed Critical Dowa Thermotech Co Ltd
Publication of EP1589120A1 publication Critical patent/EP1589120A1/fr
Publication of EP1589120A4 publication Critical patent/EP1589120A4/fr
Application granted granted Critical
Publication of EP1589120B1 publication Critical patent/EP1589120B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • C21D9/0056—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
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • 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
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • 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
    • F27D19/00—Arrangements of controlling devices

Definitions

  • the present invention relates to a method and furnace for heat treatment of a metal. More specifically, it relates to a method and a furnace for heat treatment using hearth rollers.
  • FIG. 5 illustrates a charging platform 10, a heat treating chamber 11, an oil tank 12, an exit conveyer 13, and a work W (e.g., Japanese Patent No. 3103905 ).
  • FIG. 6 illustrates a series of hearth rollers 14 (e.g., Japanese Unexamined Patent Application Publication No. 63-33552 )
  • US 4,932,864 describes a continuous furnace in which different clutch and motor arrangements can be selected to speed up the movement of the work as it passes from one chamber to another.
  • US 4,966,547 describes a tunnel furnace partitioned into a plurality of zones for heat treatment, the temperatures in the zones being independently controllable.
  • the batch furnaces using hearth rollers require a much time for temperature rise, temperature fall and soaking and have insufficient production efficiency and thermal efficiency, since carburization (at 930°C to 1050°C) and temperature-fall-soaking (at 830°C to 850°C) are repeated in the same chamber, as in the batch furnaces using the in-furnace rail.
  • the furnaces of this type require a space for always rotating the series of hearth rollers 14 forward and backward when the work W resides therein, so as to prevent the series of hearth rollers 14 from deformation due to elevated temperatures in the heat treating chamber.
  • they show large thermal radiation, since the both ends of the series of hearth rollers 14 penetrate the furnace wall.
  • an object of at least the preferred embodiments of the present invention is to solve the conventional problems in the batch furnaces using the in-furnace rail or the hearth rollers having the configurations and to provide a means for heat treatment which has enhanced production efficiency and thermal efficiency and high cost effectiveness.
  • Another object of the preferred embodiments of the present invention is to provide a heat treating furnace which is compact in size and is economical.
  • the present invention provides a heat treating furnace for carrying out continuously a heat treatment for workpieces, comprising a linear furnace body including, in its inside, a preheating chamber, a heat treating chamber and a soaking chamber, the chambers being partitioned by partitioning doors and having series of independently-driven hearth rollers, respectively, wherein the series of hearth rollers in the preheating chamber and the soaking chamber are so configured as to be rotatable forward and backward, characterised in that the series of hearth rollers in the heat treating chamber is so configured as to be rotatable and inchable forward alone to sequentially move a workpiece within said heat treating chamber.
  • the series of hearth rollers in the heat treating chamber is stopped during heat treatment of the work.
  • This heat treating furnace enables accurate control of the atmosphere and temperature in various heat treatments, since the inside of the furnace body is partitioned into the preheating chamber, the heat treating chamber and the soaking chamber by the partitioning doors.
  • the series of hearth rollers is rotated forward and backward in the heat treating chamber, so as to prevent the series of hearth rollers from deformation caused by heating at high temperatures.
  • the series of hearth rollers is not rotated backward, namely, is only rotated forward or inched in the heat treating chamber.
  • the down-sizing of the heat treating chamber yields significant advantages, since the heat treating chamber stands at elevated temperatures during operation. Specifically, the down-sizing saves heaters and burners for heating, reduces their energy consumption and cost typically in electric power or gas and significantly reduces cost of, for example, heat insulating materials.
  • the heat treating furnace of the present invention can also be used in a method for carrying out continuously a heat treatment of workpieces in the heat treating furnace described above, the method comprising the steps of rotating the series of hearth rollers in the preheating chamber and the soaking chamber forward and backward to thereby vibrate the work during preheating and soaking of the work and comprising the step of inching the series of hearth rollers in the heat treating chamber during heat treatment of the work to sequentially move a workpiece within said heat treating chamber.
  • the heat treating method just mentioned above enables supply of a uniformly preheated work to the heat treating chamber and enables accurate soaking of the work after heat treatment in a heat treating method in which the series of hearth rollers in the heat treating chamber is stopped during heat treatment of the work.
  • US 4627814 provides a heat treating furnace, a linear furnace body of which includes, in its inside, a preheating chamber, a heat treating chamber and a soaking chamber, the chambers being partitioned by partitioning doors and having series of independently-driven hearth rollers, respectively.
  • the series of hearth rollers in the preheating chamber and the soaking chamber are so configured as to be rotatable forward and backward.
  • the invention is characterised in that the series of hearth rollers in the heat treating chamber is so configured as to be inchable forward alone. Accordingly, only forward rotation or inching of the series of hearth rollers is carried out in the heat treating chamber.
  • the heat treating methods described above can easily carry out heat treatment by using the heat treating furnace of the invention.
  • the heat treating furnace can reduce the sizes of the heat treating chamber and the entire furnace body, since there is no need of a space for reciprocating motion of the work in the heat treating chamber.
  • the down-sizing of the heat treating chamber can significantly reduce cost.
  • the heat treating furnace does not require, in contrast to conventional equivalents, the forward and backward rotation of the series of hearth rollers in the heat treating chamber to prevent deformation thereof and can carry out heat treatment of the work while inching the hearth roller.
  • the furnace therefore does not require a space for the reciprocating motion of the work and can have a reduced size.
  • the series of hearth rollers in the heat treating chamber is made from a material containing a refractory steel, the refractory steel further containing trace amounts of tungsten, cobalt and titanium so as to have improved creep properties.
  • the furnace can reduce heat radiation from the both ends of the series of hearth rollers penetrating the furnace wall, since the series of hearth rollers can have a reduced diameter.
  • the wall of the furnace body includes a brick layer, a silica layer and a layer including a compression-molded article derived from titanium oxide and an inorganic fiber.
  • This heat treating furnace can have reduced thermal diffusion and increased insulation effectiveness of the furnace wall and can yield economical advantages due to reduced heating energy.
  • the furnace can have a reduced thickness in its wall and a reduced length of the series of hearth rollers so as to further effectively prevent the deformation of the hearth roller.
  • a heat treating furnace 1 comprises a linear furnace body which includes, in its inside, a preheating chamber 3, a heat treating chamber 4 and a soaking chamber 5, which are partitioned by partitioning doors 1 and 2 as shown in Figs. 1 to 3 .
  • the figures also illustrate a charging platform 10, a heat treating chamber 11, an oil tank 12 and an exit conveyer 13.
  • the ratio in size of the preheating chamber 3 to the heat treating chamber 4 and that of the soaking chamber 5 to the heat treating chamber 4 are preferably set at 1:3. This can yield a production about three times as much as that of conventional heat treating furnaces, although the total length of the furnace is set being substantially equal to that of the conventional equivalents.
  • the preheating chamber 3, the heat treating chamber 4 and the soaking chamber 5 have series of independently-driven hearth rollers 6, 7 and 8, respectively.
  • the series of hearth rollers 6 and 8 in the preheating chamber 3 and the soaking chamber 5 are so configured as to be rotated forward and backward, and the series of hearth rollers 7 in the heat treating chamber 4 is so configured as only to be rotated forward and inched.
  • the series of hearth rollers 7 in the heat treating chamber 4 of the heat treating furnace 1 comprises a material containing a refractory steel.
  • the refractory steel further contains trace amounts of tungsten, cobalt and titanium and thereby has improved creep properties. This eliminates the necessity of repeating the forward and backward rotation of the series of hearth rollers 7 in the heat treating chamber 4 so as to prevent its deformation, in contrast to the conventional equivalents.
  • the furnace therefore saves a space for the reciprocating motion of the work W in the heat treating chamber 4, and the heat treating chamber and the entire heat treating furnace can be down-sized.
  • the furnace can reduce heat radiation from the both ends of the series of hearth rollers penetrating the furnace wall, since the series of hearth rollers can have a reduced diameter, such as 90 mm, as compared with a conventional one, such as 104 mm.
  • the series of hearth rollers 6 and 8 in the preheating chamber 3 and the soaking chamber 5 can comprise the same material as that of the series of hearth rollers 7 in the heat treating chamber 4.
  • the deformation, typically bent, of the series of hearth rollers is significantly affected by the strength of the hearth roller, as well as by the difference between the temperature of work W and the temperature inside the furnace (in-furnace temperature).
  • the difference between the temperature of work W and the in-furnace temperature is large in the preheating chamber 3. Accordingly, the deformation of the series of hearth rollers 7 can be minimized by allowing the series of hearth rollers 6 in preheating chamber 3 to rotate forward and backward to thereby reduce the difference in temperature and then feeding the work W to the heat treating chamber 4.
  • the bents were each determined by measuring the distances between the center point and points 75 mm inside the flanges at the both ends of a sample hearth roller using a dial gauge.
  • the bent of the conventional hearth roller was measured before and after repetitive forward and backward rotation, and that of the hearth roller according to this embodiment was measured before and after inching (stopping and forward rotation) alone.
  • Fig. 4 is a sectional view of furnace wall of the heat treating furnace according to the present invention with an adiabatic temperature curve. More specifically, the furnace wall comprises a brick layer 15 having a thickness of 115 mm, a silica layer 16 having a thickness of 85 mm, and a compressed molded article 17 of titanium oxide and an inorganic fiber having a thickness of 50 mm, in this order from the inside of furnace.
  • the adiabatic temperature curve shows that the surface temperature of furnace body is 50.2°C (atmospheric temperature: 20°C) while the in-furnace temperature is held to 950°C, indicating that the furnace can be significantly reduced in its wall thickness and can save energy.
  • the heat treating furnace 1 can be used in various heat treatments of metals.
  • Fig. 1 shows an example of carburization. Specifically, a work W is fed onto the charging platform 10, fed to the preheating chamber 3 via a charging door (not shown), and the series of hearth rollers 6 in the preheating chamber 3 is rotated forward and backward to thereby preheat the work W uniformly.
  • the partitioning door 1 between the preheating chamber 3 and the heat treating chamber 4 is then opened, the series of hearth rollers 6 and 7 are operated, and the work W is conveyed to the heat treating chamber 4, followed by carburization at a set temperature of 940°C in a set atmosphere at a carbon potential of 1.0% for a set time of 540 minutes.
  • the carburization in the heat treating chamber 4 of the heat treating furnace shown in Figs. 1 to 3 is carried out while the series of hearth rollers 7 is not rotated backward but is stopped.
  • the work W is subjected to carburization by rotating forward or inching the series of hearth rollers 7 in the heat treating chamber 4 to thereby sequentially move the work W to a set position in the heat treating chamber 4. In this procedure, the series of hearth rollers 7 is not rotated backward.
  • the series of hearth rollers 7 in the heat treating chamber 4 is rotated forward or inched so as to allow three blocks of the work W to reside in the heat treating chamber 4 for 540 minutes for carburization, respectively.
  • the three blocks of the work W are capable of conveying to and charging in the heat treating chamber 4.
  • One block of the work W after the completion of carburization is conveyed to the soaking chamber 5, and another block of the work W before carburization is fed from the preheating chamber 3 to the heat treating chamber 4.
  • the partitioning door 2 between the heat treating chamber 4 and the soaking chamber 5 is opened, and the work W after the completion of carburization in the heat treating chamber 4 is conveyed to the soaking chamber 5 by the action of the series of hearth rollers 7 and 8.
  • the work W undergoes temperature fall and soaking at a set soaking temperature, for example, 850°C, while rotating the series of hearth rollers 8 in the soaking chamber 5 forward and backward.
  • a door (not shown) between the soaking chamber 5 and the oil tank 12 is then opened, followed by quenching of the work W.
  • an exit door (not shown) is opened and the work W is conveyed to the exit conveyer 13.
  • Fig. 2 shows an example of soft nitriding using the heat treating furnace 1.
  • a work W is fed onto the charging platform 10, fed to the preheating chamber 3 via a charging door (not shown), and the series of hearth rollers 6 in the preheating chamber 3 is rotated forward and backward to thereby preheat the work W uniformly.
  • the partitioning door 1 between the preheating chamber 3 and the heat treating chamber 4 is then opened, the series of hearth rollers 6 and 7 are operated, and the work W is conveyed to the heat treating chamber 4, followed by soft nitriding, for example, at a set temperature of 550°C in a set atmosphere of RX gas and ammonia gas for a set time of 120 minutes.
  • the partitioning door 2 between the heat treating chamber 4 and the soaking chamber 5 is opened, and the work W is conveyed to the soaking chamber 5 by the action of the series of hearth rollers 7 and 8.
  • a door (not shown) between the soaking chamber 5 and the oil tank 12 is opened, and the work W without soaking is subjected to quenching.
  • an exit door (not shown) is opened and the work W is conveyed to the exit conveyer 13.
  • Fig. 3 shows an example of thermal refining using the heat treating furnace 1.
  • a work W is fed onto the charging platform 10, fed to the preheating chamber 3 via a charging door (not shown), and the series of hearth rollers 6 in the preheating chamber 3 is rotated forward and backward to thereby preheat the work W uniformly.
  • the partitioning door 1 between the preheating chamber 3 and the heat treating chamber 4 is then opened, the series of hearth rollers 6 and 7 are operated, and the work W is conveyed to the heat treating chamber 4, followed by thermal refining, for example, at a set temperature of 880°C in a set atmosphere at a carbon potential of 0.3% to 0.5% for a set time of 30 minutes.
  • the following processes are as in the soft nitriding, and the work W is subjected to quenching without soaking process.
  • the present invention can provide a heat treatment furnace and method with increased production efficiency and thermal efficiency, and a heat treating furnace having a reduced size and economical efficiency.

Landscapes

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

Abstract

Four (1) de traitement thermique à corps linéaire qui possède une chambre de préchauffe (3), une chambre de traitement thermique (4) et une chambre de chauffe uniforme (5), des portes de séparation (1, 2) séparant ces chambres entre elles. Des groupes (6, 7, 8) de cylindres de sole entraînés de manière indépendante sont respectivement placés dans chacune des chambres. Lors de la préchauffe et de la chauffe uniforme de pièces (W), les deux groupes (6, 8) de cylindres de sole situés dans la chambre de prétraitement (3) et dans la chambre de chauffe uniforme (5) sont amenés à tourner dans un sens et dans le sens opposé pour faire osciller les pièces (W). Au moment de la chauffe de la pièce (W), le groupe (7) de cylindres de sole situé dans la chambre de traitement thermique (4) est stoppé.

Claims (5)

  1. Four de traitement thermique pour mettre en oeuvre un traitement thermique de pièces (W) de manière continue, comportant un corps de four linéaire incluant, dans son espace intérieur, une chambre de préchauffage (3), une chambre de traitement thermique (4) et une chambre de trempe (5), les chambres (3, 4 et 5) étant séparées par des portes de séparation (1 et 2) et ayant des séries de rouleaux de sole entraînés indépendamment (6, 7 et 8), respectivement, dans lequel les séries de rouleaux de sole (6 et 8) dans la chambre de préchauffage (3) et la chambre de trempe (5) sont configurées de manière à pouvoir tourner vers l'avant et vers l'arrière, caractérisé en ce que la série de rouleaux de sole (7) dans la chambre de traitement thermique (4) est configurée de manière à pouvoir tourner et être mise en mouvement par à-coups vers l'avant, seule, pour déplacer séquentiellement une pièce (W) à l'intérieur de ladite chambre de traitement thermique (4).
  2. Four de traitement thermique tel que revendiqué dans la revendication 1, dans lequel le rapport de taille de la chambre de préchauffage (3) sur la chambre de traitement thermique (4) est fixé à 1:3, et le rapport de taille de la chambre de trempe (5) sur la chambre de traitement thermique (4) est également fixé à 1:3.
  3. Four de traitement thermique selon la revendication 1 ou 2, dans lequel la paroi du corps de four comporte une couche de briques (15), une couche de silice (16) et une couche (17) comportant un article moulé par compression obtenu à partir d'oxyde de titane et d'une fibre inorganique.
  4. Four de traitement thermique tel que revendiqué dans la revendication 1, 2 ou 3, dans lequel la série de rouleaux de sole (7) dans la chambre de traitement thermique (4) comporte un matériau contenant un acier réfractaire, l'acier réfractaire contenant en outre d'infimes quantités de tungstène, de cobalt et de titane de manière à avoir des propriétés de fluage améliorées.
  5. Procédé pour mettre en oeuvre de manière continue un traitement thermique de pièces (W) dans le four de traitement thermique selon l'une quelconque des revendications précédentes, le procédé comportant les étapes consistant à faire tourner les séries de rouleaux de sole (6 et 8) dans la chambre de préchauffage (3) et la chambre de trempe (5) vers l'avant et vers l'arrière pour ainsi faire vibrer la pièce (W) pendant le préchauffage et la trempe de la pièce (W), et comportant l'étape consistant à mettre en mouvement par à-coups la série de rouleaux de sole (7) dans la chambre de traitement thermique (4) pendant le traitement thermique de la pièce (W) pour déplacer séquentiellement une pièce (W) à l'intérieur de ladite chambre de traitement thermique (4).
EP03812311A 2002-11-29 2003-11-27 Procede et four pour traitement thermique Expired - Lifetime EP1589120B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002348639 2002-11-29
JP2002348639A JP4330111B2 (ja) 2002-11-29 2002-11-29 熱処理方法及び熱処理炉
PCT/JP2003/015120 WO2004050922A1 (fr) 2002-11-29 2003-11-27 Procede et four pour traitement thermique

Publications (3)

Publication Number Publication Date
EP1589120A1 EP1589120A1 (fr) 2005-10-26
EP1589120A4 EP1589120A4 (fr) 2006-02-22
EP1589120B1 true EP1589120B1 (fr) 2012-06-06

Family

ID=32462929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03812311A Expired - Lifetime EP1589120B1 (fr) 2002-11-29 2003-11-27 Procede et four pour traitement thermique

Country Status (3)

Country Link
EP (1) EP1589120B1 (fr)
JP (1) JP4330111B2 (fr)
WO (1) WO2004050922A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4876279B2 (ja) * 2004-09-13 2012-02-15 Ｄｏｗａサーモテック株式会社 熱処理炉
JP4982763B2 (ja) * 2005-09-30 2012-07-25 Ｄｏｗａサーモテック株式会社 連続熱処理炉
JP4982762B2 (ja) * 2005-09-30 2012-07-25 Ｄｏｗａサーモテック株式会社 熱処理炉
JP2010014290A (ja) * 2008-07-01 2010-01-21 Ihi Corp 多室型熱処理炉
JP4982726B2 (ja) * 2010-04-12 2012-07-25 Ｄｏｗａサーモテック株式会社 熱処理炉
CN102252525A (zh) * 2011-01-10 2011-11-23 朱海良 一种电炉炉胆的改进结构
EP3196320B1 (fr) * 2014-09-04 2019-08-21 JFE Steel Corporation Procédé de fabrication de tôle d'acier magnétique directionnelle et équipement de traitement de nitruration
CN104593577B (zh) * 2015-01-07 2017-07-25 浙江正泰电器股份有限公司 一种带双金属片的线圈组件的整体热处理方法及线圈组件
CN105018117B (zh) * 2015-07-27 2017-12-01 长兴嘉诚炉业有限公司 一种肉尸连续式热解炭化方法
CN105256112A (zh) * 2015-11-06 2016-01-20 浙江尚鼎工业炉有限公司 一种连续式铝镁合金热处理炉
CN105331790A (zh) * 2015-11-06 2016-02-17 浙江尚鼎工业炉有限公司 一种连续式铝镁合金热处理炉
CN105671249B (zh) * 2016-03-21 2017-09-01 青岛凯利热处理有限公司 一种热处理炉内的导热机构
CN106399656B (zh) * 2016-03-21 2018-05-22 管敏富 一种用于铝合金工件热处理的搬运托架
CN112775388B (zh) * 2021-01-29 2023-03-31 诸暨虹茂重工机械有限公司 用于锻造加热炉的旋转组件
WO2022218831A1 (fr) * 2021-04-16 2022-10-20 Aerospace Transmission Technologies GmbH Procédé de traitement thermique de pièces métalliques
EP4305368A1 (fr) * 2021-04-16 2024-01-17 Aerospace Transmission Technologies GmbH Procédé de traitement thermique de pièces métalliques
EP4305369A1 (fr) * 2021-04-16 2024-01-17 Aerospace Transmission Technologies GmbH Dispositif de traitement thermique de pièces métalliques

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5167212A (ja) * 1974-12-09 1976-06-10 Daido Steel Co Ltd Funikinetsushorirono sosahoho
JPS6127485A (ja) * 1984-07-17 1986-02-06 中外炉工業株式会社 連続式雰囲気熱処理炉
JP2582554B2 (ja) 1986-07-24 1997-02-19 大同特殊鋼株式会社 鋼材の浸炭処理方法
JPH01252886A (ja) * 1988-03-31 1989-10-09 Central Glass Co Ltd 熱加工炉並びにそれによる熱処理方法
JPH0714353Y2 (ja) * 1988-07-08 1995-04-05 中外炉工業株式会社 ローラハース型熱処理炉
JPH0622358U (ja) * 1992-07-28 1994-03-22 石川島播磨重工業株式会社 焼鈍炉
JP2001200311A (ja) * 2000-01-19 2001-07-24 Nippon Steel Corp 鋼材の熱処理炉用ハースロール
JP4305716B2 (ja) * 2002-02-12 2009-07-29 Ｄｏｗａホールディングス株式会社 熱処理炉

Also Published As

Publication number Publication date
WO2004050922A1 (fr) 2004-06-17
EP1589120A1 (fr) 2005-10-26
JP2004183013A (ja) 2004-07-02
JP4330111B2 (ja) 2009-09-16
EP1589120A4 (fr) 2006-02-22

Similar Documents

Publication Publication Date Title
EP1589120B1 (fr) Procede et four pour traitement thermique
US8460484B2 (en) Method of making a shaped object with regions of different ductility
JP4305716B2 (ja) 熱処理炉
US20170218473A1 (en) Method for heating steel sheets and device for carrying out the method
KR860001201A (ko) 연속형 대기 열처리로
JPH08285462A (ja) 真空下で金属加工物を熱処理する装置
US4455177A (en) Method and apparatus for chemical heat treatment of steel parts utilizing a continuous electric furnace
GB2162208A (en) Heat treatment of metal workpieces
EP0536986A1 (fr) Procédé et dispositif pour le durcissement superficiel d'acier
JP2005009702A (ja) 多室型真空熱処理装置
SU1487818A3 (ru) Способ термической обработки металлических заготовок в печи и устройство для его осуществления
CA2316669A1 (fr) Methode et dispositif de fabrication de fil mince
KR100906191B1 (ko) 하스롤러식 연속침탄 열처리로(爐)
US2290551A (en) Heat treating furnace
JP6237459B2 (ja) 鋼管の熱処理方法およびそれを用いる軸受用鋼管の製造方法
JPH11181516A (ja) 雰囲気熱処理方法及び雰囲気熱処理炉
US6036485A (en) Annealing furnace
US4336412A (en) Heat treatment furnace
KR200382112Y1 (ko) Iso/ca 메쉬벨트형 연속식 열처리로용 항온존
JP5005537B2 (ja) 低圧熱化学的処理機械
JP3553207B2 (ja) 金属の熱処理装置
JP2003183724A (ja) 熱処理炉
JP2009161785A (ja) サイジングプレス用熱処理設備
KR100394469B1 (ko) 가스질화 열처리 방법 및 그 장치
RU1770705C (ru) Безмуфельный агрегат

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

17P Request for examination filed

Effective date: 20050629

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

A4 Supplementary search report drawn up and despatched

Effective date: 20060112

RIC1 Information provided on ipc code assigned before grant

Ipc: C21D 9/00 20060101ALI20060105BHEP

Ipc: C21D 1/00 20060101AFI20040623BHEP

Ipc: F27B 9/24 20060101ALI20060105BHEP

Ipc: F27B 9/02 20060101ALI20060105BHEP

RBV Designated contracting states (corrected)

Designated state(s): DE ES FR GB IT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: DOWA HOLDINGS CO., LTD.

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: DOWA THERMOTECH CO., LTD.

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 60341202

Country of ref document: DE

Effective date: 20120802

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120606

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20120917

26N No opposition filed

Effective date: 20130307

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 60341202

Country of ref document: DE

Effective date: 20130307

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20121127

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121127

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 13

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 14

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 60341202

Country of ref document: DE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20221010

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20221004

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 60341202

Country of ref document: DE