US20030047642A1 - Device for guiding a metal strip on a gas cushion - Google Patents

Device for guiding a metal strip on a gas cushion Download PDF

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Publication number
US20030047642A1
US20030047642A1 US10/240,064 US24006402A US2003047642A1 US 20030047642 A1 US20030047642 A1 US 20030047642A1 US 24006402 A US24006402 A US 24006402A US 2003047642 A1 US2003047642 A1 US 2003047642A1
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United States
Prior art keywords
band
nozzle fields
metal band
longitudinal direction
basic shape
Prior art date
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Abandoned
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US10/240,064
Inventor
Peter Ebner
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus
    • B21C47/3466—Feeding or guiding devices not specially adapted to a particular type of apparatus by using specific means
    • B21C47/3475—Fluid pressure or vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • 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
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/63—Continuous furnaces for strip or wire the strip being supported by a cushion of gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B65H2406/112—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along preferably rectilinear path, e.g. nozzle bed for web

Definitions

  • the invention relates to an apparatus for guiding a metal band on a gas cushion with blowing boxes which are disposed one after the other in the longitudinal direction of the band and which comprise nozzle fields which extend transversally to the longitudinal direction of the band and comprise hole-type nozzles distributed over the field surface area.
  • the gas cushion is used not only for the contactless guidance of the metal band but also for heat transmission, it is necessary to additionally take the heat influences into account for a heat treatment of the metal band, which lead to the consequence, among other things, that the metal band arches about a central longitudinal axis. This means that the distance of the metal band from the nozzle field is larger than in the zone of the longitudinal edges of the metal band. Due to said arching of the band it is necessary to choose the conditions for the supporting air cushion in such a way that in the middle zone of the metal band a sufficient distance from the blowing boxes must be ensured in order to exclude any contacts in the zone of the longitudinal edges. This necessary increase of the distance in the middle zone leads to a reduction in the carrying force, which then either requires the use of thinner metal bands or an increase in the gas volume flow through the nozzle fields.
  • the invention is thus based on the object of providing an apparatus for guiding a metal band on an air cushion of the kind mentioned above in such a way that a metal band arching under the influence of heat can be guided in a contactless manner without having to take into account any loss in carrying force which is caused by the arching of the metal band.
  • nozzle fields are provided with a convex basic shape through field sections which slope in an end section at either side transversally to the longitudinal direction of the band.
  • the continuous progress of the curvature of the metal band transversally to the longitudinal direction of the band can be realized in the simplest case by field sections which slope at either side transversally to the longitudinal direction of the band in an end section of the nozzle fields.
  • the field sections of the nozzle fields can increasingly slope at either side. This condition can be achieved by longitudinal sections of the nozzle fields which are combined in a polygon-like way. It is understood that a continuous curvature of the nozzle fields is possible. This requires respectively increased manufacturing efforts, however.
  • blowing boxes with respective nozzle fields are provided both above and below the metal band to be guided in a contactless manner in order to enable an even heat treatment from both sides of the metal band. It is therefore recommended in such a nozzle field arrangement above and below the metal band to be guided to arrange the upper nozzle fields with a concave basic shape which is adapted to the convex basic shape of the lower nozzle fields. Said concave basic shape of the upper nozzle fields naturally does not have any effect on the carrying capacity, but instead has a considerable influence on the even heat transmission, which obviously does not have to be explained in closer detail here.
  • FIG. 1 shows the subject matter of the invention in an exemplary fashion.
  • An apparatus in accordance with the invention is shown for guiding a metal band on a gas cushion in sections in a simplified diagram.
  • the apparatus for guiding a metal band 1 consists of a frame 2 which carries blowing boxes 4 which are disposed one after the other in the longitudinal direction 3 of the band and which form nozzle fields 5 .
  • Said nozzle fields 5 extend transversally to the longitudinal direction 3 of the band and comprise hole-type nozzles 6 which are distributed over the field surface area and through which gas (e.g. air) is blown to form a gas cushion against the metal band 1 .
  • gas e.g. air
  • the apparatus for guiding a metal band 1 consists of a frame 2 which carries blowing boxes 4 which are disposed one after the other in the longitudinal direction 3 of the band and which form nozzle fields 5 .
  • Said nozzle fields 5 extend transversally to the longitudinal direction 3 of the band and comprise hole-type nozzles 6 which are distributed over the field surface area and through which gas (e.g. air) is blown to form a gas cushion against the metal band 1 .
  • slotted nozzles 8 which delimit the field of the hole-
  • the gas flow deflected on the metal band 1 flows off on the one hand between the two rows of slotted nozzles of each nozzle field 5 against the longitudinal edges 9 of the metal band 1 and reaches on the other hand between the return flow channels 10 which are formed between the blowing boxes 4 and which expand with respect to the flow cross section from the longitudinal center of the metal band 1 against the longitudinal edges 9 as a result of the frame surfaces 11 which slope downwardly in a roof-like fashion in order to thus ensure the lowest possible flow speed and thus a comparably low pressure drop.
  • the nozzle fields 5 are provided with a convex basic shape which is adjusted to the curvature of the heated metal band 1 in order to ensure a distance which remains substantially the same over the band width between the metal band 1 and the nozzle surfaces 5 .
  • the convex basic shape of the blowing boxes 4 is achieved by longitudinal sections 13 of the field surface which start out from a middle section 12 and slope increasingly downwardly and are combined in a polygonal manner in order to enable a sufficient adjustment to the continuous curvature of the curved metal band 1 with simple constructional means. As a result of this adjustment, advantageous carrying conditions are obtained without endangering the contactless guidance of the metal band 1 on the gas cushions of the nozzle fields 5 .
  • the blowing boxes 14 which are disposed above the metal band 1 and are indicated with the dot-dash line can also be provided nozzle fields 5 which are adjusted to the curvature of the metal band 1 and which are then provided with a respective concave basic shape, so that the distance to the metal band 1 can be held approximately similarly over the width of the band.
  • the invention is not limited to the illustrated embodiment because it is not the type and arrangement of the nozzles that is relevant. Instead, it is merely the convex basic shape of the lower blowing boxes 4 which is adjusted to the curvature of the heated metal band 1 and possibly also the concave basic shape of the nozzle fields 5 of the upper blowing boxes 4 in order to ensure on the one hand advantageous carrying conditions and on the other hand an even heat treatment of the curved metal band 1 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Advancing Webs (AREA)
  • Wire Bonding (AREA)

Abstract

An apparatus is described for guiding a metal band (1) on a gas cushion with blowing boxes (4) which are disposed one after the other in the longitudinal direction (3) of the band and which comprise nozzle fields (5) which extend transversally to the longitudinal direction (3) of the band and comprise hole-type nozzles (6) distributed over the field surface area. In order to provide advantageous constructional conditions it is proposed that the nozzle fields (5) are provided with a convex basic shape through field sections (1, 3) which slope in at least one end section at either side transversally to the longitudinal direction of the band.

Description

  • An apparatus for guiding a metal band on a gas cushion [0001]
  • The invention relates to an apparatus for guiding a metal band on a gas cushion with blowing boxes which are disposed one after the other in the longitudinal direction of the band and which comprise nozzle fields which extend transversally to the longitudinal direction of the band and comprise hole-type nozzles distributed over the field surface area. [0002]
  • In order to enable the conveyance of a metal band floating on a gas cushion in the longitudinal direction of the band it is known (DE 30 26 132 A) to provide blowing boxes which are disposed one after the other in the longitudinal direction of the band and whose nozzle fields extend transversally to the longitudinal direction of the band and comprise hole-type nozzles which are distributed over the field surface area. The gas flowing through said hole-type nozzles against the metal band form a supporting air cushion which is supported by a gas flow from slotted nozzles which extend transversally to the longitudinal direction of the band and delimit the field surface forming the hole-type nozzles. Since the gas cushion is used not only for the contactless guidance of the metal band but also for heat transmission, it is necessary to additionally take the heat influences into account for a heat treatment of the metal band, which lead to the consequence, among other things, that the metal band arches about a central longitudinal axis. This means that the distance of the metal band from the nozzle field is larger than in the zone of the longitudinal edges of the metal band. Due to said arching of the band it is necessary to choose the conditions for the supporting air cushion in such a way that in the middle zone of the metal band a sufficient distance from the blowing boxes must be ensured in order to exclude any contacts in the zone of the longitudinal edges. This necessary increase of the distance in the middle zone leads to a reduction in the carrying force, which then either requires the use of thinner metal bands or an increase in the gas volume flow through the nozzle fields. [0003]
  • The invention is thus based on the object of providing an apparatus for guiding a metal band on an air cushion of the kind mentioned above in such a way that a metal band arching under the influence of heat can be guided in a contactless manner without having to take into account any loss in carrying force which is caused by the arching of the metal band. [0004]
  • This object is achieved by the invention in such a way that the nozzle fields are provided with a convex basic shape through field sections which slope in an end section at either side transversally to the longitudinal direction of the band. [0005]
  • As a result of a convex basic shape of the nozzle fields which is adjusted to the curvature of the metal band, an approximately even distance between the metal band and the nozzle fields can be ensured in a simple manner so that the carrying force of the air cushions as produced by the nozzle fields can be utilized fully without having to fear that the longitudinal edges of the band will touch the blowing boxes. The convex basic shape of the nozzle fields which is adapted to the curvature of the heated metal band further ensures a substantially vertical flow charging of the metal bands in the zone of the longitudinal edge, so that overall favorable carrying conditions can be ensured. [0006]
  • The continuous progress of the curvature of the metal band transversally to the longitudinal direction of the band can be realized in the simplest case by field sections which slope at either side transversally to the longitudinal direction of the band in an end section of the nozzle fields. In order to ensure a further adjustment of the field surface of the nozzle fields to the curvature of the heated metal band, the field sections of the nozzle fields can increasingly slope at either side. This condition can be achieved by longitudinal sections of the nozzle fields which are combined in a polygon-like way. It is understood that a continuous curvature of the nozzle fields is possible. This requires respectively increased manufacturing efforts, however. [0007]
  • In the heat treatment of metal bands, blowing boxes with respective nozzle fields are provided both above and below the metal band to be guided in a contactless manner in order to enable an even heat treatment from both sides of the metal band. It is therefore recommended in such a nozzle field arrangement above and below the metal band to be guided to arrange the upper nozzle fields with a concave basic shape which is adapted to the convex basic shape of the lower nozzle fields. Said concave basic shape of the upper nozzle fields naturally does not have any effect on the carrying capacity, but instead has a considerable influence on the even heat transmission, which obviously does not have to be explained in closer detail here. [0008]
  • The drawing shows the subject matter of the invention in an exemplary fashion. An apparatus in accordance with the invention is shown for guiding a metal band on a gas cushion in sections in a simplified diagram.[0009]
  • According to the illustrated embodiment, the apparatus for guiding a [0010] metal band 1 consists of a frame 2 which carries blowing boxes 4 which are disposed one after the other in the longitudinal direction 3 of the band and which form nozzle fields 5. Said nozzle fields 5 extend transversally to the longitudinal direction 3 of the band and comprise hole-type nozzles 6 which are distributed over the field surface area and through which gas (e.g. air) is blown to form a gas cushion against the metal band 1. Along the edges 7 of the nozzle fields 5 which extend transversally to the longitudinal direction 3 of the band there are slotted nozzles 8 which delimit the field of the hole-type nozzles 6 and which support the gas cushion formed by the hole-type nozzles 6 with their gas jets. The gas flow deflected on the metal band 1 flows off on the one hand between the two rows of slotted nozzles of each nozzle field 5 against the longitudinal edges 9 of the metal band 1 and reaches on the other hand between the return flow channels 10 which are formed between the blowing boxes 4 and which expand with respect to the flow cross section from the longitudinal center of the metal band 1 against the longitudinal edges 9 as a result of the frame surfaces 11 which slope downwardly in a roof-like fashion in order to thus ensure the lowest possible flow speed and thus a comparably low pressure drop.
  • In contrast to conventional nozzle fields, the [0011] nozzle fields 5 according to the invention are provided with a convex basic shape which is adjusted to the curvature of the heated metal band 1 in order to ensure a distance which remains substantially the same over the band width between the metal band 1 and the nozzle surfaces 5. As can be seen in the illustrated embodiment, the convex basic shape of the blowing boxes 4 is achieved by longitudinal sections 13 of the field surface which start out from a middle section 12 and slope increasingly downwardly and are combined in a polygonal manner in order to enable a sufficient adjustment to the continuous curvature of the curved metal band 1 with simple constructional means. As a result of this adjustment, advantageous carrying conditions are obtained without endangering the contactless guidance of the metal band 1 on the gas cushions of the nozzle fields 5.
  • Since an even heat treatment of a [0012] metal band 1 from both sides requires nozzle fields on both the lower as well as the upper side of the metal band, the blowing boxes 14 which are disposed above the metal band 1 and are indicated with the dot-dash line can also be provided nozzle fields 5 which are adjusted to the curvature of the metal band 1 and which are then provided with a respective concave basic shape, so that the distance to the metal band 1 can be held approximately similarly over the width of the band.
  • It is understood that the invention is not limited to the illustrated embodiment because it is not the type and arrangement of the nozzles that is relevant. Instead, it is merely the convex basic shape of the lower blowing [0013] boxes 4 which is adjusted to the curvature of the heated metal band 1 and possibly also the concave basic shape of the nozzle fields 5 of the upper blowing boxes 4 in order to ensure on the one hand advantageous carrying conditions and on the other hand an even heat treatment of the curved metal band 1.

Claims (3)

1. An apparatus for guiding a metal band on a gas cushion with blowing boxes which are disposed one after the other in the longitudinal direction of the band and which comprise nozzle fields which extend transversally to the longitudinal direction of the band and comprise hole-type nozzles distributed over the field surface area, characterized in that the nozzle fields (5) are provided with a convex basic shape through field sections (1, 3) which slope in at least one end section at either side transversally to the longitudinal direction of the band.
2. An apparatus as claimed in claim 1, characterized in that the field sections (2, 3) of the nozzle fields (5) slope increasingly downwardly to either side.
3. An apparatus as claimed in claim 1 or 2, characterized in that when providing nozzle fields (5) below and above the metal band (1) to be guided the upper nozzle fields (5) are provided with a concave basic shape which is adjusted to the convex basic shape of the lower nozzle fields (5).
US10/240,064 2000-05-05 2001-04-25 Device for guiding a metal strip on a gas cushion Abandoned US20030047642A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA791/200 2000-05-05
AT0079100A AT409301B (en) 2000-05-05 2000-05-05 DEVICE FOR GUIDING A METAL STRIP ON A GAS PILLOW

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US20030047642A1 true US20030047642A1 (en) 2003-03-13

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US (1) US20030047642A1 (en)
EP (1) EP1278692B1 (en)
KR (1) KR20030034066A (en)
CN (1) CN1440360A (en)
AT (1) AT409301B (en)
AU (1) AU7033701A (en)
DE (1) DE50101142D1 (en)
WO (1) WO2001083346A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6805318B2 (en) * 2000-05-05 2004-10-19 Peter Ebner Device for guiding a metal strip on a gas cushion
US20070125876A1 (en) * 2005-07-28 2007-06-07 Ralf Bolling Nozzle system for the treatment of web-shaped material
US20090115113A1 (en) * 2005-08-01 2009-05-07 Ebner Industrieofenbau Ges.M.B.H Apparatus for cooling a metal strip
WO2018019670A1 (en) * 2016-07-29 2018-02-01 Sms Group Gmbh Device and method for forming a transverse curvature on a metal strip leaving an annealing furnace
US11268762B2 (en) 2017-03-08 2022-03-08 Ebner Industrieofenbau Gmbh Gas-cushion-type strip-supporting system having a nozzle system
US11708621B2 (en) 2019-02-28 2023-07-25 Ebner Industrieofenbau Gmbh Strip flotation furnace

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50307743D1 (en) * 2002-10-19 2007-08-30 Koenig & Bauer Ag folding
DE10306509B4 (en) * 2003-02-14 2007-08-23 Otto Junker Gmbh Nozzle field for the floating guidance of material webs
DE10359113A1 (en) * 2003-12-17 2005-07-21 Voith Paper Patent Gmbh Width stretching machine has adjustable gas pad between arched material length and stretching device, and curved length guide element
CN113800294A (en) * 2021-10-21 2021-12-17 江苏盛玛特新材料科技有限公司 Winding equipment of non-woven fabrics production usefulness

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US3332762A (en) * 1963-11-29 1967-07-25 Permaglass Method of and apparatus for heat treating glass sheets on a gas support bed
US3375093A (en) * 1965-01-11 1968-03-26 Permaglass Method and apparatus for curving glass sheets or the like on a gas support bed
US3477839A (en) * 1966-06-02 1969-11-11 Ppg Industries Inc Apparatus for bending glass sheets on a gas support bed
US4378988A (en) * 1980-06-10 1983-04-05 Saint Gobain Vitrage Elements for bending plates made of a material in the plastic state, use of such elements for bending and hardening plates and a device equipped with such elements
US4664692A (en) * 1985-04-11 1987-05-12 Central Glass Company, Limited Heat treatment furnace for glass
US5078776A (en) * 1989-09-05 1992-01-07 Nippon Sheet Glass Co., Ltd. Air bed conveying system
US5522912A (en) * 1993-09-24 1996-06-04 Nippon Sheet Glass Co., Ltd. Apparatus for manufacturing three-dimensionally curved sheet glass
US6286338B2 (en) * 1998-02-26 2001-09-11 Visteon Global Technologies, Inc. Block assembly for a gas-type lehr

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JPH06305618A (en) * 1993-04-26 1994-11-01 Mitsubishi Heavy Ind Ltd Turn bar
JPH07233422A (en) * 1994-02-22 1995-09-05 Daido Steel Co Ltd Float-supporting device for strip
US5570519A (en) * 1995-02-10 1996-11-05 Valmet Corporation Method and device in contact-free treatment of a web
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Publication number Priority date Publication date Assignee Title
US3332762A (en) * 1963-11-29 1967-07-25 Permaglass Method of and apparatus for heat treating glass sheets on a gas support bed
US3375093A (en) * 1965-01-11 1968-03-26 Permaglass Method and apparatus for curving glass sheets or the like on a gas support bed
US3477839A (en) * 1966-06-02 1969-11-11 Ppg Industries Inc Apparatus for bending glass sheets on a gas support bed
US4378988A (en) * 1980-06-10 1983-04-05 Saint Gobain Vitrage Elements for bending plates made of a material in the plastic state, use of such elements for bending and hardening plates and a device equipped with such elements
US4664692A (en) * 1985-04-11 1987-05-12 Central Glass Company, Limited Heat treatment furnace for glass
US5078776A (en) * 1989-09-05 1992-01-07 Nippon Sheet Glass Co., Ltd. Air bed conveying system
US5522912A (en) * 1993-09-24 1996-06-04 Nippon Sheet Glass Co., Ltd. Apparatus for manufacturing three-dimensionally curved sheet glass
US6286338B2 (en) * 1998-02-26 2001-09-11 Visteon Global Technologies, Inc. Block assembly for a gas-type lehr

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6805318B2 (en) * 2000-05-05 2004-10-19 Peter Ebner Device for guiding a metal strip on a gas cushion
US20070125876A1 (en) * 2005-07-28 2007-06-07 Ralf Bolling Nozzle system for the treatment of web-shaped material
US20090115113A1 (en) * 2005-08-01 2009-05-07 Ebner Industrieofenbau Ges.M.B.H Apparatus for cooling a metal strip
US7968046B2 (en) * 2005-08-01 2011-06-28 Ebner Industrieofenbau Ges.M.B.H Apparatus for cooling a metal strip
WO2018019670A1 (en) * 2016-07-29 2018-02-01 Sms Group Gmbh Device and method for forming a transverse curvature on a metal strip leaving an annealing furnace
US11268762B2 (en) 2017-03-08 2022-03-08 Ebner Industrieofenbau Gmbh Gas-cushion-type strip-supporting system having a nozzle system
US11708621B2 (en) 2019-02-28 2023-07-25 Ebner Industrieofenbau Gmbh Strip flotation furnace

Also Published As

Publication number Publication date
CN1440360A (en) 2003-09-03
EP1278692B1 (en) 2003-12-10
ATA7912000A (en) 2001-11-15
AU7033701A (en) 2001-11-12
WO2001083346A1 (en) 2001-11-08
DE50101142D1 (en) 2004-01-22
AT409301B (en) 2002-07-25
KR20030034066A (en) 2003-05-01
EP1278692A1 (en) 2003-01-29

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