EP1735473B1 - Usine de recuit de bandes metalliques - Google Patents

Usine de recuit de bandes metalliques Download PDF

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Publication number
EP1735473B1
EP1735473B1 EP04727095A EP04727095A EP1735473B1 EP 1735473 B1 EP1735473 B1 EP 1735473B1 EP 04727095 A EP04727095 A EP 04727095A EP 04727095 A EP04727095 A EP 04727095A EP 1735473 B1 EP1735473 B1 EP 1735473B1
Authority
EP
European Patent Office
Prior art keywords
strap
previous
electrified
plant according
roller
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
EP04727095A
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German (de)
English (en)
Other versions
EP1735473A1 (fr
Inventor
Fabrizio Recchia
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.)
Officine Meccaniche di Lesmo SpA
Original Assignee
Officine Meccaniche di Lesmo SpA
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Filing date
Publication date
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Publication of EP1735473A1 publication Critical patent/EP1735473A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance 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
    • 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
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum

Definitions

  • the present invention relates to a plant for annealing metal straps, and in particular to a plant for annealing in a continuous manner a metal strap coming from a rolling mill.
  • the metal straps are generally formed of a metal wire, for example made of copper, aluminum or their alloys, which is shaped in a rolling mill for conferring it a particular section, for example rectangular or square. During this rolling process the metal hardens, so that the strap becomes very rigid and must therefore be annealed for bringing it back to the initial mechanical features. It is not possible to anneal the straps with the known Joule-effect plants (see e.g. EP-A-1063306 ) employed for continuously annealing the metal wires, since the strap, being rolled and not drawn as the wires, is much more rigid than the latter, so that it does not perfectly adhere to the electrified rollers of these known plants and thus it does not become sufficiently hot for being annealed.
  • a metal wire for example made of copper, aluminum or their alloys
  • said known annealing plants for the wires should be modified for increasing the strap pulling force, which however would cause the breaking of the same straps in the annealing zone, where their mechanical resistance is reduced due to their heating.
  • JP - 10 237557 discloses a device with electrified rollers for heating a metal plate. Since the contact between plate and rollers is limited only to a generatrix of the latter, said device cannot be used for annealing straps, because this limited contact is not sufficient for adequately heating and thus annealing a strap, which is relatively narrower and thicker than a plate. Furthermore, the diameter of the rollers is relatively small, so that they cannot deviate the running direction of a strap without permanently deforming the latter.
  • the straps are wound around a bobbin after the rolling process and are annealed in a oven, i.e. in a discontinuous manner, with the consequent waste of energy, time, space and/or human resources.
  • the plant according to the present invention allows to anneal in a continuous manner metal straps, also very rigid and having different thicknesses and widths. Furthermore, thanks to the particular trajectory followed by the strap for passing around the electrified rollers, the strap does not undergo breakings or deformations even when it is annealed.
  • the plant according to the present invention preferably comprises particular control rollers and/or pulling devices for improving the feed of the strap without suffering sudden tensile stresses which could ruin it.
  • the plant can be provided with a chamber filled with saturated vapor for avoiding the strap oxidation during the annealing, as well as with a tank a duct and drying chambers for cooling and drying the strap.
  • the plant according to the present embodiment of the invention comprises at least three electrified rollers 1, 2, 3, the outer surface of which is conductive and connected to an electric voltage generator.
  • the voltage of the second electrified roller 2 is therefore higher or lower than the voltage of the first roller 1 and of the third roller 3, so that a strap 4 passing around these electrified rollers 1, 2, 3 is crossed by an electric current and becomes hot due to the Joule effect.
  • the diameter of the electrified rollers 1, 2, 3 is equal to the thickness of the strap 4 multiplied by a coefficient k greater than 200, preferably greater than 330, and in any case greater than 700 mm, in particular comprised between 1400 and 1600 mm.
  • the electrified rollers 1, 2, 3 are arranged with the rotation axis substantially horizontal, wherein the rotation axis of the second electrified roller 2 is arranged above or below the rotation axes of the electrified rollers 1 and 3.
  • the outer surface of the electrified rollers 1 and 3 is provided with a replaceable contact ring made of an alloy of nickel or copper, while the outer surface of the second electrified roller 2 is provided with a contact ring made of an alloy of nickel or copper.
  • the electrified rollers 1, 2, 3 are cooled by a liquid cooling system and are driven by motors with a controlled speed, also of a known kind. Said cooling system and said motors are arranged in a support structure 5 which can be closed frontally by one or more motorized rolling shutters 6. From the entrance to the exit of the plant, strap 4 follows a path lying on a substantially vertical plane.
  • strap 4 coming from the outside reaches a first control roller 7 pivoted to an arm 8 which is in turn pivoted to the support structure 5 and is urged by adjustable elastic means so as to oscillate according to the tension of strap 4.
  • the strap passes around an idle roller 9 pivoted to the support structure 5 and reaches a first pulling device 10 provided with a pair of rubber belts between which strap 4 is pressed for being pulled inside the plant.
  • the feed speed of the pulling device 10 is controlled for varying according to the speed of strap 4 when it goes into the plant.
  • Said speed can be for example detected by a sensor arranged close to the control roller 7 or it can be communicated by means of electric signals by sensors arranged upstream the plant, for example in the rolling mill.
  • the feed speed of the pulling device 10 is further controlled for varying according to the angular position of arm 8, which is detected by an electric or electronic sensor, so as to compensate changes, if any, of the entry speed of strap 4.
  • the latter after having crossed two opposing idle rollers 11, 12, one of which pivoted on an oscillating arm 13, reaches a second control roller 15 pivoted to an arm 14 which is in turn pivoted to the support structure 5 and is urged by adjustable elastic means so as to oscillate according to the tension of strap 4.
  • the latter after having gone beyond the second control roller 14, reaches the first electrified roller 1 which deviates it with an angle a less than 90°, in particular comprised between 40° and 80°.
  • strap 4 passes through a series of ceramic rings 15 mounted in a mobile manner on plates 16 which are fixed to the front wall of the support structure 5 and are provided with horizontal rails for mounting rings 15 at different positions.
  • Guides 17 provided with rollers are fixed to the front wall of the support structure 5 for making strap 4 run along an alternative path 18 (shown with a broken line) for bypassing the electrified rollers 1, 2, 3, thus passing beside them, when strap 4 coming from the rolling mill must not be annealed.
  • strap 4 reaches a temperature comprised between 160° and 200°.
  • strap 4 after it has gone beyond the first electrified roller 1, reaches the second electrified roller 2 which deviates it with an angle b less than 90°, in particular comprised between 40° and 80°, after which it goes into a chamber 19 arranged between the electrified rollers 2, 3. Since between these two rollers the strap reaches an annealing temperature, in particular comprised between 500° and 600°, a saturated vapor is let into chamber 19 for avoiding the oxidation of strap 4.
  • the rotation speed of the electrified roller 3 is slightly greater than the speed of the electrified roller 2, in turn slightly greater than the speed of the electrified roller 1, so as to compensate the thermal dilatation of strap 4 due to its heating.
  • Chamber 19 is connected to a tank 20 arranged under the electrified roller 3, so that strap 4 is immersed in a cooling liquid contained in tank 20 when it passes around the electrified roller 3.
  • Said cooling liquid is for example water with a low percentage, for example comprised between 0,1 % and 2%, of drawing oil.
  • Strap 4 is deviated by the third electrified roller 3 with an angle c less than 90°, in particular comprised between 40° and 80°, after which it goes into a duct 21 in which the cooling liquid is let in and flows in the direction opposite to the feed direction of strap 4, so that this liquid is collected in tank 20 for being pumped again into duct 21.
  • strap 4 after it has left duct 21, passes along an idle roller 22 covered by a cover 23 and crosses one or more drying chambers 24 in which compressed air is let it for eliminating the cooling liquid, after which it goes into a second pulling device 25 provided with a pair of rubber belts between which strap 4 is pressed for being pulled out of the plant.
  • the feed speed of the second pulling device 25 is controlled for varying according to the feed speed of the first pulling device 10 and of the angular position of arm 14 of the second control roller 15, which is detected by an electric or electronic sensor, so as to compensate changes, if any, of the feed speed of the pulling device 10.
  • One or more sensors 26 can be arranged at the exit of the plant of checking the size of strap 4.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Electroluminescent Light Sources (AREA)
  • Laminated Bodies (AREA)
  • Replacement Of Web Rolls (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)

Claims (25)

  1. Installation pour recuire de bandes métalliques (4), caractérisée en ce qu'elle comprend une structure support (5) pour un ou plusieurs moteur(s) approprié(s) pour faire tourner au moins trois rouleaux électrifiés (1, 2, 3) dans lesquels la tension du second rouleau électrifié (2) est supérieure ou inférieure à la tension du premier rouleau (1) et du troisième rouleau (3), de sorte qu'une bande (4) passant autour de ces rouleaux électrifiés (1, 2, 3) est traversée par un courant électrifié et se réchauffe par effet Joule, le diamètre des rouleaux électrifiés (1, 2, 3) étant égal à l'épaisseur de la bande (4) multipliée par un coefficient (k) supérieur à 200, dans laquelle les premier (1), second (2), et/ou troisième (3) rouleaux électrifiés dévient la bande (4) selon un angle déterminé (a, b, c) supérieur à 0° et sont arrangés avec l'axe de rotation sensiblement horizontal, dans laquelle l'axe de rotation du second rouleau électrifié (2) est arrangé au-dessus ou en-dessous des axes de rotation du premier rouleau électrifié (1) et du troisième rouleau électrifié (3).
  2. Installation selon la revendication précédente, caractérisée en ce que ledit coefficient (k) est supérieur à 330.
  3. Installation selon l'une des revendications précédentes, caractérisée en ce que le diamètre des premier (1), second (2) et/ou troisième (3) rouleaux électrifiés est supérieur à 700 mm.
  4. Installation selon la revendication précédente, caractérisée en ce que le diamètre des premier (1), second (2), et/ou troisième (3) rouleaux électrifiés est compris entre 1 400 et 1 600 mm.
  5. Installation selon l'une des revendications précédentes, caractérisée en ce que les premier (1), second (2), et/ou troisième (3) rouleaux électrifiés dévient la bande selon un angle (a, b, c) inférieur à 90°.
  6. Installation selon la revendication précédente, caractérisée en ce que ledit angle (a, b, c) est compris entre 40° et 80°.
  7. Installation selon l'une des revendications précédentes, caractérisée en ce que depuis l'entrée jusqu'à la sortie de l'installation, la bande (4) suit un chemin s'étendant sur un plan sensiblement vertical.
  8. Installation selon l'une des revendications précédentes, caractérisée en ce que la vitesse de rotation du troisième rouleau électrifié (3) est supérieure à la vitesse du second rouleau électrifié (2), elle-même supérieure à celle de la vitesse du premier rouleau électrifié (1).
  9. Installation selon l'une des revendications précédentes, caractérisée en ce que des guides (17) pourvus de rouleaux sont fixés à la paroi avant de la structure support (5) pour faire passer la bande (4) le long d'un chemin alternatif (18) pour éviter les rouleaux électrifiés (1, 2, 3).
  10. Installation selon l'une des revendications précédentes, caractérisée en ce que la bande (4) est tirée dans l'installation par un premier dispositif de traction (10) pourvu d'une paire de courroies en caoutchouc entre lesquelles la bande (4) est pressée.
  11. Installation selon la revendication précédente, caractérisée en ce que la vitesse d'alimentation du premier dispositif de traction (10) est commandée pour varier selon la vitesse de la bande (4) quand elle arrive dans l'installation.
  12. Installation selon l'une des revendications précédentes, caractérisée en ce que la bande (4) quand elle arrive dans l'Installation, passe autour d'un premier rouleau de commande (7) pivoté vers un bras (8) qui est poussé par des moyens élastiques ajustables de façon à osciller selon la tension de la bande (4) et est pourvu d'un détecteur approprié pour détecter la position angulaire du bras (8).
  13. Installation selon la revendication précédente, caractérisée en ce que la vitesse d'alimentation du premier dispositif de traction (10) est commandée pour varier selon la position angulaire du bras (8) du premier rouleau de commande (7).
  14. Installation selon l'une des revendications précédentes, caractérisée en ce que la bande (4) est tirée hors de l'installation par un second dispositif de traction (25) pourvu d'une paire de courroies en caoutchouc entre lesquelles la bande (4) est pressée.
  15. Installation selon la revendication précédente, caractérisée en ce que la vitesse d'alimentation du second dispositif de traction (25) est commandée pour varier selon la vitesse d'alimentation du premier dispositif de traction (10).
  16. Installation selon l'une des revendications précédentes, caractérisée en ce que la bande (4), avant de passer autour du premier rouleau électrifié (1), passe autour d'un second rouleau de commande (15) pivoté vers un bras (14) qui est poussé par des moyens élastiques ajustables de façon à osciller selon la tension de la bande (4) et est pourvu d'un détecteur approprié pour détecter la position angulaire du bras (14).
  17. Installation selon la revendication précédente, caractérisée en ce que la vitesse d'alimentation du second dispositif de traction (25) est commandée pour varier selon la position angulaire du bras (14) du second rouleau de commande (15).
  18. Installation selon l'une des revendications précédentes, caractérisée en ce qu'une chambre (19) est arrangée entre les second (2) et troisième (3) rouleaux électrifiés pour être traversée par la bande (4) et être remplie de vapeur saturée appropriée pour éviter l'oxydation de la bande (4).
  19. Installation selon l'une des revendications précédentes, caractérisée en ce qu'une cuve (20) est arrangée sous le troisième rouleau électrifié (3), de sorte que la bande (4) est immergée dans un liquide de refroidissement contenu dans la cuve (20) quand elle passe autour du troisième rouleau électrifié (3).
  20. Installation selon la revendication précédente, caractérisée en ce qu'une conduite (21) est arrangée en aval de la cuve (20) pour être traversée par la bande (4), le liquide de refroidissement étant laissé à l'intérieur et s'écoulant dans la direction opposée à la direction d'alimentation de la bande (4), de façon à être collecté dans la cuve (20) pour être pompé de nouveau dans la conduite (21).
  21. Installation selon la revendication précédente, caractérisée en ce que ledit liquide de refroidissement est de l'eau avec un pourcentage compris entre 0,1% et 2% d'huile d'étirage.
  22. Installation selon la revendication précédente, caractérisée en ce qu'une ou plusieurs chambre(s) de séchage (24) dans lesquelles de l'air comprimé est laissé pour éliminer le liquide de refroidissement sont arrangées en aval de ladite conduite (21) pour être traversées par la bande (4).
  23. Installation selon l'une des revendications précédentes, caractérisée en ce que la surface externe des premier (1) et troisième (3) rouleaux électrifiés est pourvue d'un anneau de contact remplaçable fait d'un alliage de nickel ou de cuivre.
  24. Installation selon l'une des revendications précédentes, caractérisée en ce que la surface externe du second rouleau électrifié (2) est pourvue d'un anneau de contact fait d'un alliage de nickel ou de cuivre.
  25. Installation selon l'une des revendications précédentes, caractérisée en ce que la structure support (5) peut être fermée frontalement par un ou plusieurs volet(s) roulant(s) motorisé(s) (6).
EP04727095A 2004-04-13 2004-04-13 Usine de recuit de bandes metalliques Expired - Lifetime EP1735473B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2004/000205 WO2005100617A1 (fr) 2004-04-13 2004-04-13 Usine de recuit de bandes metalliques

Publications (2)

Publication Number Publication Date
EP1735473A1 EP1735473A1 (fr) 2006-12-27
EP1735473B1 true EP1735473B1 (fr) 2007-07-25

Family

ID=34957490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04727095A Expired - Lifetime EP1735473B1 (fr) 2004-04-13 2004-04-13 Usine de recuit de bandes metalliques

Country Status (6)

Country Link
EP (1) EP1735473B1 (fr)
AT (1) ATE368131T1 (fr)
DE (1) DE602004007833T2 (fr)
ES (1) ES2290694T3 (fr)
TW (1) TWI340766B (fr)
WO (1) WO2005100617A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102367511B (zh) * 2011-10-25 2013-04-10 浙江佰耐钢带有限公司 一种电热辊钢带连续加热炉

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56166336A (en) * 1980-05-22 1981-12-21 Furukawa Electric Co Ltd:The Continuously annealing apparatus for wire rod
JPH08264261A (ja) * 1995-03-27 1996-10-11 Nippon Steel Corp リバース式圧延装置
JPH10237557A (ja) * 1997-02-24 1998-09-08 Sumitomo Metal Ind Ltd 金属板の直接通電加熱方法
JPH10298669A (ja) * 1997-04-19 1998-11-10 Furukawa Electric Co Ltd:The 軟化線材の製造方法
IT1312036B1 (it) * 1999-03-30 2002-04-04 Sictra Machinery S R L Ricottore continuo ad effetto juole per trafilatrici multifilo.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1735473A1 (fr) 2006-12-27
TWI340766B (en) 2011-04-21
WO2005100617A1 (fr) 2005-10-27
DE602004007833T2 (de) 2008-04-17
ATE368131T1 (de) 2007-08-15
DE602004007833D1 (de) 2007-09-06
TW200538558A (en) 2005-12-01
ES2290694T3 (es) 2008-02-16

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