EP0591589A1 - Procédé et machine à dresser des tôles - Google Patents

Procédé et machine à dresser des tôles Download PDF

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Publication number
EP0591589A1
EP0591589A1 EP92402731A EP92402731A EP0591589A1 EP 0591589 A1 EP0591589 A1 EP 0591589A1 EP 92402731 A EP92402731 A EP 92402731A EP 92402731 A EP92402731 A EP 92402731A EP 0591589 A1 EP0591589 A1 EP 0591589A1
Authority
EP
European Patent Office
Prior art keywords
metal plate
levelling
rollers
work
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.)
Withdrawn
Application number
EP92402731A
Other languages
German (de)
English (en)
Inventor
Kazumi Isaka
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to EP92402731A priority Critical patent/EP0591589A1/fr
Publication of EP0591589A1 publication Critical patent/EP0591589A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers

Definitions

  • the present invention relates to a metal plate levelling and apparatus in which a metal plate, such as a hot-rolled or cold-rolled steel plate, sheet, or strip having a relatively large thickness, is heated to a predetermined temperature by directly applying an electric current to the metal plate, sheet, or strip so as to perform levelling or levelling + heat treatment.
  • a metal plate such as a hot-rolled or cold-rolled steel plate, sheet, or strip having a relatively large thickness
  • a roller leveler and tension leveler are widely used as a metal plate levelling apparatus.
  • a roller leveler comprises upper and lower rollers which are arranged in staggered form.
  • a metal plate is passed through the rollers and is bent repeatedly upward and downward so as to perform correction of shape.
  • a tension leveler is a machine in which a metal plate is repeatedly bent upward and downward under application of tension to the metal plate. They are referred to merely as "levelers" hereunder.
  • levelling can be performed by way of applying a large amount of tension or reduction to the metal plate.
  • a leveler of a large scale which also requires a large space for the machine, resulting in an increase in initial and running costs.
  • Another approach to increase the levelling effect is to heat the metal plate So as to decrease the deformation resistance of a metal plate.
  • An article titled "Development of New Type Leveler for Thick Plate” in “Plasticity and Working” vol.29, No.333, pp.1010-1015 discloses a method of effecting levelling of a metal plate after heating it. According to this article, elongation of a metal plate increases as the temperature thereof increases even when a small amount of tension is applied to the metal plate. This means that it is possible to provide a leveler which can be operated under small tension, i.e., a small-sized and economical leveler, if the levelling is carried out on a metal plate kept at a high temperature.
  • An object of the present invention is to provide a method and apparatus for efficiently carrying out levelling by heating a metal plate to be treated to a temperature suitable for effecting levelling in a levelling line.
  • work rollers of a roller leveler, tension leveler, and the like i.e., leveler rollers are used as electrodes, and an electric current is directly supplied to the metal plate to be treated.
  • Pinch rollers provided outside the leveler may also be used as electrodes. It is easy to carry out efficient heating and precise temperature control when such a direct application of electric current to the metal plate is employed.
  • the present invention is a method of levelling a metal plate characterized in that levelling or levelling and heat treatment before and after levelling is performed while directly supplying an electric current to the metal plate through a work roller and/or pinch roller provided on the downstream or upstream side of the work roller, which are connected to an electric source.
  • the present invention is a metal plate levelling apparatus comprising at least two work rollers and an electric source which is connected to the work rollers to directly supply an electric current to a metal plate.
  • the present invention is a metal plate levelling apparatus comprising at least one work roller, at least one pair of pinch rollers provided on the inlet or outlet side of the work roller, and an electric source which is connected to the work roller or pinch rollers, or both to directly apply an electric current to a metal plate.
  • Figure 1 is a schematic side view of a levelling apparatus of the present invention in which two work rollers are used as electrodes.
  • Figure 2 is a schematic side view of a levelling apparatus of the present invention in which one pair of pinch rollers and a work roller are used as electrodes.
  • Figure 3 is a schematic side view of a levelling apparatus of the present invention in which two pairs of pinch rollers are provided on the upstream side of a work roller and are used as electrodes.
  • Figure 4 is a schematic side view of a levelling apparatus of the present invention in which one work roller and one pair of pinch rollers provided on the downstream side of a work roller are used as electrodes.
  • Figure 5 is a schematic side view of a levelling apparatus of the present invention in which two pairs of pinch rollers are provided on the downstream side of a work roller and are used as electrodes.
  • Figure 6 is a schematic side view of a levelling apparatus of the present invention in which a pair of pinch rollers is provided on both the upstream side and downstream side of a work roller, respectively, and each pair is used as electrodes.
  • Figure 7 is a schematic side view of a levelling apparatus of the present invention in which a pair of pinch rollers is provided on both the upstream side and downstream side of a work roller, respectively, and each pair is used as electrodes together with the corresponding work rollers.
  • Figure 8 is a schematic side view of a levelling apparatus which is used in a working example of the present invention.
  • Figure 9 is an illustration of shape defects such as edge waviness.
  • Figure 1 shows a levelling apparatus which comprises at least two work rollers used as electrodes.
  • a steel plate S is travelling in the direction shown by the arrow through a leveler 1 in which it is subjected to levelling.
  • the leveler comprises a plurality of work rollers 2-1, 2-2, 2-4, - - - -, 2-n.
  • the steel plate S is bent upward and downward repeatedly to flatten it. Additional tension rollers (not shown) may be provided before or after the leveler 1 so as to apply tension to the metal plate.
  • Work roller 2-1 and work roller 2-4 serve as electrodes and are connected to an electric source 3. In this case it is necessary to electrically insulate intermediate work rollers 2-2 and 2-3 from the roller stand.
  • the electric current may be an alternating or direct current. When the electric current is directly supplied to the metal plate S, Joule heat is generated in the metal sheet between the work rollers 2-1 and 2-4 to heat it. Any two of the work rollers may be used as a pair of electrodes.
  • Figure 2 shows another levelling apparatus which comprises a pair of pinch rollers provided upstream of the leveller and at least one work roller used as electrodes.
  • a pair of pinch rollers 4 and a work roller 2-4 are used as electrodes. Needless to say, a work roller other than work roller 2-4 may be used as an electrode.
  • additional work rollers 2-8 and 2-n may be used as supplementary electrodes, as illustrated by dashed lines.
  • FIG. 3 shows still another levelling apparatus which comprises at least two pair of pinch rollers used as electrodes, the pinch rollers being provided on the inlet side of the leveller 1.
  • two pairs of pinch rollers 4-1 and 4-2 provided on the inlet side, i.e., upstream of the leveller are used as electrodes.
  • a metal plate S is heated by supplying an electric current between these pairs of pinch rollers. It is advisable to set up the pinch rollers 4-2 as close as possible to the leveller 1. If the metal plate S is heated thoroughly before going into the leveler, levelling can be done at a relatively high temperature. Since the temperature of the metal plate is decreased when it contacts the work roller within the leveller, it is also advisable to re-heat the metal plate by supplying an electric current between work rollers 2-4 and 2-8, for example, as illustrated by dashed lines.
  • Figure 4 shows still another levelling apparatus which comprises at least one work roller and a pair of pinch rollers used as electrodes.
  • a pair of pinch rollers 4 which are positioned on the outlet side, i.e., downstream of a leveller 1 is used as electrodes, and a work roller 2-n which is positioned closest to the outlet of the leveller 1 is used as an electrode. If necessary, any other of the work rollers may instead be used as an electrode.
  • levelling itself is carried out under usual conditions without heating the metal plate S, but the metal plate is subjected to heat treatment after levelling.
  • the heat treatment includes heating, for example, to release residual stresses and improve the metallurgical properties of the plate.
  • any two other work rollers e.g., work rollers 2-4 and 2-8, may be used as additional electrodes as shown by the dashed line in Figure 4 in order to heat the metal plate while it is passing through the leveller 1.
  • Figure 5 shows a levelling apparatus which comprises at least two pairs of pinch rollers used as electrodes and positioned on the outlet side of a leveller.
  • two pair of pinch rollers 4-1 and 4-2 are used as electrodes and are disposed so as to heat a metal plate S for effecting heat treatment of the metal plate S after levelling thereof.
  • any two other work rollers e.g., work rollers 2-4 and 2-8, may be used as additional electrodes as shown by the dashed line in Figure 4 in order to carry out levelling of the metal plate under hot conditions.
  • Figure 6 shows a levelling apparatus using, as electrodes, two pairs of pinch rollers. One pair is positioned on the inlet side and the other one is on the outlet side of the leveller.
  • Figure 7 shows a levelling apparatus which uses, as electrodes, a pair of pinch rollers positioned on the inlet side of a leveler, another pair of pinch rollers positioned on the outlet side of the leveller 1, and at least two work rollers each corresponding to the pairs of pinch rollers, respectively.
  • an electric current is directly supplied to a metal plate through rollers which contact the metal plate in order to heat it.
  • a work roller is used as one of the electrodes, there is no need of a space for a heating apparatus.
  • a pinch roller provided outside of the leveller is used as one of the electrodes, the pinch roller is just required to contact a metal plate uniformly in the widthwise direction. Therefore, a small diameter roller, such as rollers of 100 - 200 mm in diameter, can be used, making the levelling apparatus simple and small.
  • the initial costs of the levelling apparatus of the present invention are much smaller and the process does not need any additional space. Furthermore, in an embodiment in which a work roller is used as an electrode, a metal sheet is heated to a maximum temperature just before it reaches the work roller, and excess heating of a metal plate to compensate for a temperature reduction, which is inevitable during travel to a work roller in a heating furnace method, is not necessary.
  • a residual stress which appears in the metal plate after levelling is suppressed thoroughly.
  • a levelling apparatus such as shown in Figures 4 - 7, a metal plate is heated after levelling and is substantially totally free from residual stress.
  • the method of the present invention is applicable to any metal plates of the type which can be heated when an electric current is supplied.
  • metal plates are steel plates, such as carbon steel plates, low-alloy steel plate, stainless steel plates, titanium plates, and titanium alloy plates.
  • a levelling apparatus having five work rollers like that shown in Figure 8 was used to carry out a levelling method of the present invention.
  • a pair of pinch rollers 5 on the inlet side and a pair of pinch roller 6 on the outlet side are of the driven type, and a metal plate S is passed through the first pair of pinch rollers 5 into a leveler installed in a housing 7, in which the metal plate S subjected to levelling, preferably in an inert atmosphere, while it passes through work rollers 2-1, 2-2, 2-3, 2-4, and 2-5, of which the work rollers 2-1 and 2-5 are used as electrodes and are connected to an electric source 3.
  • Work rollers 2-1 through 2-4 are electrically insulated from the housing 7. The outermost work roller 2-5 is not insulated. When an electric current is supplied to a metal plate while it is travelling along a series of work rollers, an electric current passing in the metal plate generates Joule heat to increase the temperature thereof.
  • insulated work rollers are hatched.
  • Figure 9 shows shape defects appearing on a metal plate before levelling. Levelling effects are determined in terms of the height (H) of an edge wave of the metal plate S.
  • Comparative Example 1 A metal plate was supplied to the same levelling apparatus without heating.
  • Comparative Example 2 A metal plate was heated to 700°C in an off-line furnace and then was supplied to the levelling apparatus.
  • the temperature difference between the central area and edges of the metal plate was less than 7°C in accordance with the present invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
EP92402731A 1992-10-07 1992-10-07 Procédé et machine à dresser des tôles Withdrawn EP0591589A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92402731A EP0591589A1 (fr) 1992-10-07 1992-10-07 Procédé et machine à dresser des tôles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92402731A EP0591589A1 (fr) 1992-10-07 1992-10-07 Procédé et machine à dresser des tôles

Publications (1)

Publication Number Publication Date
EP0591589A1 true EP0591589A1 (fr) 1994-04-13

Family

ID=8211716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402731A Withdrawn EP0591589A1 (fr) 1992-10-07 1992-10-07 Procédé et machine à dresser des tôles

Country Status (1)

Country Link
EP (1) EP0591589A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1900829A1 (fr) * 2006-09-11 2008-03-19 Hugo Vogelsang GmbH & Co. KG Procédé et dispositif de revenu de feuillards d'acier
CN102569554A (zh) * 2012-01-06 2012-07-11 昆山市华英精密模具工业有限公司 Led支架整平装置
CN107716611A (zh) * 2017-10-11 2018-02-23 四川明日宇航工业有限责任公司 一种批量校形夹具及校形方法
CN112742936A (zh) * 2020-11-27 2021-05-04 燕山大学 一种带电辅助装置的反复弯轧机组

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1347917A (en) * 1918-07-10 1920-07-27 Morgan Construction Co Method of and apparatus for rolling metal
DE702241C (de) * 1936-02-20 1941-02-03 Emil Vits Walzwerk mit unmittelbarer Erwaermung des WalzguteKontaktwalzen
FR1232687A (fr) * 1958-08-01 1960-10-11 Westinghouse Electric Corp Procédé de fabrication de bande d'acier magnétique perfectionnée
GB882756A (en) * 1958-12-31 1961-11-22 Armco Int Corp Thermal-flattening of metallic strip
GB951749A (en) * 1961-12-29 1964-03-11 Armco Steel Corp Method for obtaining flat and stress-free magnetic strip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1347917A (en) * 1918-07-10 1920-07-27 Morgan Construction Co Method of and apparatus for rolling metal
DE702241C (de) * 1936-02-20 1941-02-03 Emil Vits Walzwerk mit unmittelbarer Erwaermung des WalzguteKontaktwalzen
FR1232687A (fr) * 1958-08-01 1960-10-11 Westinghouse Electric Corp Procédé de fabrication de bande d'acier magnétique perfectionnée
GB882756A (en) * 1958-12-31 1961-11-22 Armco Int Corp Thermal-flattening of metallic strip
GB951749A (en) * 1961-12-29 1964-03-11 Armco Steel Corp Method for obtaining flat and stress-free magnetic strip

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1900829A1 (fr) * 2006-09-11 2008-03-19 Hugo Vogelsang GmbH & Co. KG Procédé et dispositif de revenu de feuillards d'acier
CN102569554A (zh) * 2012-01-06 2012-07-11 昆山市华英精密模具工业有限公司 Led支架整平装置
CN107716611A (zh) * 2017-10-11 2018-02-23 四川明日宇航工业有限责任公司 一种批量校形夹具及校形方法
CN112742936A (zh) * 2020-11-27 2021-05-04 燕山大学 一种带电辅助装置的反复弯轧机组

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