US20120018931A1 - High-temperature furnace for the annealing of sheet-metal joints - Google Patents

High-temperature furnace for the annealing of sheet-metal joints Download PDF

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Publication number
US20120018931A1
US20120018931A1 US13/138,616 US201013138616A US2012018931A1 US 20120018931 A1 US20120018931 A1 US 20120018931A1 US 201013138616 A US201013138616 A US 201013138616A US 2012018931 A1 US2012018931 A1 US 2012018931A1
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United States
Prior art keywords
annealing
annealing base
protective
hood
protective hood
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.)
Abandoned
Application number
US13/138,616
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English (en)
Inventor
Robert Ebner
Dieter Ch. Brandstaetter
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.)
Ebner Industrieofenbau GmbH
Original Assignee
Ebner Industrieofenbau 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 Ebner Industrieofenbau GmbH filed Critical Ebner Industrieofenbau GmbH
Assigned to EBNER INDUSTRIEOFENBAU GESELLSCHAFT M.B.H. reassignment EBNER INDUSTRIEOFENBAU GESELLSCHAFT M.B.H. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRANDSTATTER, DIETER CH., EBNER, ROBERT
Publication of US20120018931A1 publication Critical patent/US20120018931A1/en
Abandoned 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
    • F27B11/00—Bell-type furnaces
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/667—Multi-station furnaces
    • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere

Definitions

  • the invention relates to a high-temperature furnace for the annealing of sheet-metal joints having an annealing base, having a support device which forms a placement surface for coaxially receiving a sheet-metal joint with spacing above the annealing base, having a protective hood, which coaxially encloses the annealing base with the support device and is connected to a protective gas supply line and a protective gas exhaust, made of a cylindrical jacket and a cupola which terminates the jacket on top, having a peripheral seal between the annealing base and the protective hood and having a heating hood which encloses the protective hood with spacing.
  • Transformer sheet-metal made of steel having a silicon component of 0.5-3.5 wt.-% is typically subjected to a high-temperature treatment in a hood furnace for technological reasons.
  • the annealed material is heated in a protective hood under protective gas, in particular nitrogen and/or hydrogen, up to 1200° C., essentially by radiant heat.
  • protective gas in particular nitrogen and/or hydrogen
  • the intrinsic strength of the annealed material decreases greatly, so that the sheet-metal joints, which comprise coiled steel strips, are each supported per se on a support device, which rests in a load-dissipating manner on an annealing base or penetrating the annealing base on a foundation.
  • the known high-temperature furnaces of this type have the disadvantage above all that during annealing of a single sheet-metal joint, the sheet-metal joint which is centrally supported above the annealing base on the support device is heated significantly less in its lower area than in its upper area.
  • the annealing procedure must therefore be lengthened in order to achieve the magnetic properties of the sheet metal over the entire joint height.
  • the heating of the upper joint or the upper joints occurs significantly more rapidly than that of the lower joint, which thus does not reach the desired final temperature and therefore has correspondingly impaired magnetic properties.
  • the thermal-insulating construction of the annealing base made of refractory concrete slabs provides hardly any improvements in this regard.
  • the protective hood is sealed via a sand bed, which receives the lower edge of the protective hood, so that the protective gas escapes through the sand bed into the heating hood and is exhausted from there.
  • the invention is therefore based on the object of implementing a high-temperature furnace of the type described at the beginning for the annealing of sheet-metal joints so that the annealed material can be heated uniformly to high treatment temperatures in a protective gas atmosphere, in order to be able to ensure advantageous, uniform annealing even of sheet-metal joints for transformer sheet-metal made of steel having a silicon content up to 3.5 wt.-%.
  • the invention achieves the stated object in that the axial jacket spacing of the protective hood, which is determined by the vertical spacing of the placement surface of the support device, has a surface which makes up at least three-fourths of the cupola surface.
  • the invention proceeds from the finding that additional radiant heat is supplied to the annealed material in the upper area of the protective hood via its cupola, so that in protective hoods for the annealing of a single sheet-metal joint, the sheet-metal joint is heated more rapidly in its upper area than in the lower area.
  • the upper or uppermost has a greater quantity of radiant heat applied thereto.
  • the protective hood is lengthened so that an additional radiant surface, which corresponds to at least three-fourths of the cupola surface, is provided between the annealing base and the placement surface of the support device for the (lower) sheet-metal joint by the lengthened jacket of the protective hood in this area, so that a sufficient amount of heat can also be supplied to the annealed material in the lower area of the protective hood, in order to at least partially compensate for the heat supplied in the upper area of the protective hood. Because of this measure, substantially uniform heating of the annealed material to the treatment temperature can thus be ensured.
  • the area of the jacket section of the protective hood corresponding to the vertical spacing of the placement surface from the annealing base must at least correspond to the cupola surface.
  • heat losses because of the heat dissipation via the annealing base are not yet taken into consideration.
  • implementing the surface of the jacket section corresponding to the vertical spacing of the placement surface from the annealing base as greater than the cupola surface suggests itself.
  • An enlargement by 5 to 20% is generally sufficient to cover the heat losses through the annealing base.
  • the annealing base can be constructed from mineral wool, which has a significantly higher thermal insulation value than typical refractory concrete slabs.
  • the carrier device penetrates the annealing base constructed from mineral wool and is supported on the furnace foundation for load dissipation.
  • the height of the annealing base constructed from mineral wool is to correspond to at least one-third, preferably one-half of the diameter of the protective hood.
  • the protective gas supply line having outlet openings distributed around the circumference of the protective hood and the protective gas exhaust having an exhaust gas line centrally penetrating the annealing base, particularly advantageous conditions result in regard to the protective gas guiding, because the protective gas is heated uniformly on the external envelope of the annealing base and the internal surface of the protective hood cylinder. This heated protective gas flows past the external hot sheet-metal joint areas and is supplied via the colder areas in the sheet-metal joint interior to the exhaust gas line guided centrally through the annealing base.
  • a further possibility in order to take varying heating of the annealed material over the height of the protective hood into consideration comprises applying heating power which decreases with height to the protective hood through the heating hood, so that because of the higher heat supply in the lower area of the protective hood, improved heating of the annealed material can be ensured.
  • heating hoods having an electrical heater separate sections of the heating unit which are each activatable per se may be provided according to height for this purpose.
  • the burners may preferably be situated in the area between the annealing base and the placement surface of the support device for the annealed material which is provided above the annealing base.
  • FIG. 1 shows a high-temperature furnace according to the invention having a gas-heated heating hood in a schematic longitudinal section and
  • FIG. 2 shows an illustration corresponding to FIG. 1 of a high-temperature furnace according to the invention having an electrically heated heating hood.
  • the high-temperature furnace according to FIGS. 1 and 2 has a furnace foundation 1 having an annealing base 2 , which is penetrated by a support device 3 for the annealed material, which is supported on the furnace foundation 1 .
  • the support device 3 is designed according to the two exemplary embodiments for receiving two sheet-metal joints 4 , which are mounted one above another on support disks 5 .
  • a protective hood 6 For the annealing of the sheet-metal joints 4 , they are enclosed by a protective hood 6 , whose jacket 7 is terminated gas-tight with the aid of a placement flange 8 and a ring seal 9 in relation to the furnace foundation 1 and the annealing base 2 .
  • the protective gas typically nitrogen and/or hydrogen
  • a protective gas supply line 10 which has outlet openings 11 distributed around the circumference of the protective hood 6 , so that the protective gas flows between the jacket 7 and the annealing base 2 along the jacket 7 into the protective hood 6 and can be exhausted centrally via an exhaust gas line 12 penetrating the annealing base 2 .
  • the heating of the annealed material occurs via a placed heating hood 13 , which has burners 14 distributed around the circumference according to FIG. 1 and has an electrical heating unit made of individual heating sections 15 which are each activatable per se according to FIG. 2 .
  • the annealed material is thus heated via the particular heating unit of the heating hood 13 , essentially by radiant heat which is emitted from the heating hood 6 .
  • the heating hood 6 not only offers radiant surfaces in its jacket 7 , but rather also using its cupola 16 , so that the joint heating also occurs via the cupola surface in the area of the upper sheet-metal joint 4 .
  • the jacket 7 is lengthened in the area between the annealing base 2 and the placement surface 17 of the support device 3 for the lower sheet-metal joint 4 .
  • the configuration is made so that the vertical spacing h of the placement surface 17 of the support device 3 from the annealing base 2 determines a jacket section of the protective hood 6 , which has a surface corresponding to at least three-fourths of the cupola surface, preferably the entire cupola surface.
  • this lateral surface section 5 can be up to 20% larger than the cupola surface.
  • a radiant surface is thus available for the heating of the lower sheet-metal joint 4 , which is adapted to the radiant surface for the upper sheet-metal joint 4 , which allows uniform heating of both sheet-metal joints 4 , with the advantage that the material properties caused by the annealing correspond.
  • the annealing base 2 it can be constructed from mineral wool having good thermal insulation properties, at a height which corresponds to at least one-third of the diameter of the jacket 7 of the protective hood 6 .
  • An annealing base 2 constructed from mineral wool is not capable, however, of dissipating the loads caused by the annealed material to the furnace foundation 1 , so that the support device 3 for the sheet-metal joints 4 is supported per se on the furnace foundation 1 .
  • the protective hood 6 can have varying heating power applied over its height.
  • the burners 14 for the gas heating in FIG. 1 are situated below the placement surface 17 for the lower sheet-metal joint 4 .
  • the individual sections 15 of the electrical heating unit may be activated, so that varying heating power may be ensured as needed depending on height by turning off or regulating individual sections, for example.
  • the high-temperature furnace may also only be designed to heat a single sheet-metal joint 4 or more than two sheet-metal joints 4 .
  • the vertical spacing h which is selected as a function of the cupola surface, of the placement surface 17 of the support device 3 from the annealing base 2 prevents uneven heating of this sheet-metal joint 4 depending on height.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Tunnel Furnaces (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
US13/138,616 2009-03-13 2010-03-03 High-temperature furnace for the annealing of sheet-metal joints Abandoned US20120018931A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ATA405/2009 2009-03-13
AT0040509A AT507671B1 (de) 2009-03-13 2009-03-13 Hochtemperaturofen zur glühbehandlung von blechbunden
PCT/AT2010/000060 WO2010102313A1 (de) 2009-03-13 2010-03-03 Hochtemperaturofen zur glühbehandlung von blechbunden

Publications (1)

Publication Number Publication Date
US20120018931A1 true US20120018931A1 (en) 2012-01-26

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US13/138,616 Abandoned US20120018931A1 (en) 2009-03-13 2010-03-03 High-temperature furnace for the annealing of sheet-metal joints

Country Status (14)

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US (1) US20120018931A1 (es)
EP (1) EP2406569A1 (es)
JP (1) JP2012520390A (es)
KR (1) KR20110135934A (es)
CN (1) CN102395852B (es)
AT (1) AT507671B1 (es)
BR (1) BRPI1009103A2 (es)
CA (1) CA2755138A1 (es)
MX (1) MX2011009546A (es)
RU (1) RU2502028C2 (es)
TW (1) TW201040287A (es)
UA (1) UA102593C2 (es)
WO (1) WO2010102313A1 (es)
ZA (1) ZA201106475B (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120018931A1 (en) * 2009-03-13 2012-01-26 Ebner Industrieofenbau Gesellschaft M.B.H. High-temperature furnace for the annealing of sheet-metal joints
CN103453765A (zh) * 2013-08-29 2013-12-18 江苏高皓工业炉有限公司 简式罩式锯片烧结炉
US20140151941A1 (en) * 2012-11-30 2014-06-05 Bilstein Gmbh & Co.Kg Hood-type annealing furnace and method for operating the same
WO2017115187A1 (en) * 2015-12-30 2017-07-06 Sabic Global Technologies B.V. Apparatus and methodologies for batch annealing
CN110398154A (zh) * 2019-06-14 2019-11-01 上海至纯洁净系统科技股份有限公司 一种保温炉防护装置
CN114277241A (zh) * 2022-01-05 2022-04-05 首钢智新迁安电磁材料有限公司 一种取向硅钢高温退火用装置及取向硅钢高温退火方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102703677A (zh) * 2012-06-27 2012-10-03 艾伯纳工业炉(太仓)有限公司 用于取向电工钢热处理的hitt单卷堆垛罩式退火炉
JP5841286B1 (ja) * 2015-07-03 2016-01-13 中外炉工業株式会社 ベル型焼鈍炉及びその改造方法
CN105969972B (zh) * 2016-07-15 2018-03-30 武汉电炉有限公司 一种高温罩式炉保护气进排气方法及装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120018931A1 (en) * 2009-03-13 2012-01-26 Ebner Industrieofenbau Gesellschaft M.B.H. High-temperature furnace for the annealing of sheet-metal joints

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JPS5864323A (ja) * 1981-10-12 1983-04-16 Nippon Steel Corp 直火式コイル焼鈍装置
JPS5935635A (ja) * 1982-08-20 1984-02-27 Kawasaki Steel Corp 薄板コイルのボツクス焼鈍方法
JPS60221521A (ja) * 1984-04-18 1985-11-06 Nippon Steel Corp 一方向性珪素鋼板の仕上焼鈍方法
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SU1337429A1 (ru) * 1986-01-30 1987-09-15 Магнитогорский горно-металлургический институт им.Г.И.Носова Нагревательный колпак печи
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JPH0776677B2 (ja) * 1988-01-18 1995-08-16 大同特殊鋼株式会社 クリーン加熱炉
JPH0556949U (ja) * 1991-12-27 1993-07-30 日新製鋼株式会社 コイルスペーサプレートの内孔部開口径調節用オリフイスプレート
AT411904B (de) * 2003-03-24 2004-07-26 Ebner Ind Ofenbau Haubenglühofen, insbesondere für stahlband- oder drahtbunde
WO2004111540A2 (en) * 2003-06-11 2004-12-23 Huntington Alloys Corporation Furnace with multiple heating
JP4730520B2 (ja) * 2005-04-20 2011-07-20 住友電気工業株式会社 ベーキング方法
RU2299915C1 (ru) * 2005-10-31 2007-05-27 Открытое акционерное общество "Новолипецкий металлургический комбинат" (ОАО "НЛМК") Колпаковая печь для отжига металла в рулонах
CN200972327Y (zh) * 2006-11-20 2007-11-07 中国船舶重工集团公司第七二五研究所 一种内配炉胆型钟罩式工业炉装置

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120018931A1 (en) * 2009-03-13 2012-01-26 Ebner Industrieofenbau Gesellschaft M.B.H. High-temperature furnace for the annealing of sheet-metal joints
US20140151941A1 (en) * 2012-11-30 2014-06-05 Bilstein Gmbh & Co.Kg Hood-type annealing furnace and method for operating the same
US9297585B2 (en) * 2012-11-30 2016-03-29 Bilstein Gmbh & Co. Kg Hood-type annealing furnace and method for operating the same
CN103453765A (zh) * 2013-08-29 2013-12-18 江苏高皓工业炉有限公司 简式罩式锯片烧结炉
WO2017115187A1 (en) * 2015-12-30 2017-07-06 Sabic Global Technologies B.V. Apparatus and methodologies for batch annealing
CN110398154A (zh) * 2019-06-14 2019-11-01 上海至纯洁净系统科技股份有限公司 一种保温炉防护装置
CN114277241A (zh) * 2022-01-05 2022-04-05 首钢智新迁安电磁材料有限公司 一种取向硅钢高温退火用装置及取向硅钢高温退火方法

Also Published As

Publication number Publication date
EP2406569A1 (de) 2012-01-18
JP2012520390A (ja) 2012-09-06
AT507671A4 (de) 2010-07-15
UA102593C2 (ru) 2013-07-25
BRPI1009103A2 (pt) 2016-03-08
AT507671B1 (de) 2010-07-15
RU2011141411A (ru) 2013-04-20
CN102395852A (zh) 2012-03-28
ZA201106475B (en) 2012-12-27
CA2755138A1 (en) 2010-09-16
TW201040287A (en) 2010-11-16
RU2502028C2 (ru) 2013-12-20
CN102395852B (zh) 2014-08-20
WO2010102313A1 (de) 2010-09-16
MX2011009546A (es) 2011-10-12
KR20110135934A (ko) 2011-12-20

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Owner name: EBNER INDUSTRIEOFENBAU GESELLSCHAFT M.B.H., AUSTRI

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