EP3208005B1 - Combined welding and rolling plant for metallic strips - Google Patents

Combined welding and rolling plant for metallic strips Download PDF

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Publication number
EP3208005B1
EP3208005B1 EP17156641.7A EP17156641A EP3208005B1 EP 3208005 B1 EP3208005 B1 EP 3208005B1 EP 17156641 A EP17156641 A EP 17156641A EP 3208005 B1 EP3208005 B1 EP 3208005B1
Authority
EP
European Patent Office
Prior art keywords
reel
coil
welding
mega
strip
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.)
Active
Application number
EP17156641.7A
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German (de)
English (en)
French (fr)
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EP3208005A1 (en
Inventor
Luciano Vignolo
Claudio SEPULVERES
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.)
Danieli and C Officine Meccaniche SpA
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Danieli and C Officine Meccaniche SpA
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Publication of EP3208005A1 publication Critical patent/EP3208005A1/en
Application granted granted Critical
Publication of EP3208005B1 publication Critical patent/EP3208005B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0085—Joining ends of material to continuous strip, bar or sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0092—Welding in the rolling direction

Definitions

  • the present invention relates to a combined welding and rolling plant for welding and rolling metallic strips.
  • the benefit of continuously rolling strips by rolling welding joints has significant benefits in terms of plant productivity, with 20% to 100% increases in hourly productivity or in kilometers rolled, of surface quality, by reducing the risk of generating defects during the step of feeding the heads and of exiting the tails being rolled, and in terms of yield, by reducing the losses of head and tail material due to out of thickness.
  • the plant comprises an inlet section, where the strips of successive coils are joined through a welder; a storing section which allows the rolling process to be fed when the last strip entering the inlet section stops to be joined with the strip preceding it; control systems for monitoring the tension and the centering of the strip, which are conveniently arranged along the plant; a four-or five-stand rolling mill, one after the other; an outlet section provided with a coil winding system; suitable systems for feeding incoming coils and evacuating exiting coils.
  • a drawback of such a solution is that from time to time, based on the length of the product to be rolled, production is limited by the "bottleneck" of the plant which, according to the size and weight of the coil, may be the plant inlet section, the storing section or the rolling mill, according to the maximum speed expressible by the tandem rolling mill with respect to the speed obtainable from each stand and to the installed power.
  • the cost of the investment is high due to the high number of pieces of equipment required to obtain the continuous rolling and the significant space required to install the plant.
  • the preamble of claim 1 is based on DE 26 06 301 A1 .
  • the present invention achieves the above objects by making a combined welding and cold rolling plant for metallic strips which, comprises
  • a second aspect of the present invention provides a welding and cold rolling process for welding and cold rolling a metallic strip, performed by means of the aforesaid plant, which comprises the following steps:
  • the invention provides to continuously roll a mega coil, thus obtaining at least two or three thickness reductions, preferably at least four or five thickness reductions.
  • a "mega coil” means a coil of strip obtained, for example, from at least 2 to 5 weldings of smaller strips.
  • a mega coil has a weight from 80 to 200 metric tons and a diameter of up to 6 meters, preferably from 4 to 6 m.
  • the size and/or weight of the final rolled coils are set at automation level, in particular by means of automation means, by setting a weight limit and/or a diameter limit.
  • the weight limit of each final rolled coil wound on a second reel is a specific weight of the final rolled coil ranging from 10 and 21 Kg per millimeter (Kg/mm).
  • the size limit is a diameter limit of each final rolled coil wound on a second reel, said diameter limit ranging from about 2000 to about 2100 mm.
  • the first limit of the size limit and the weight limit which is reached by the rolled coil on the respective second reel triggers the cutting by means of the cutting means at the outlet of the rolling mill.
  • sensors detect that the size limit or the weight limit has been reached, sensors send a control signal to said cutting means, to actuate the cutting means.
  • the plant and process of the invention allow to obtain final rolled coils having a predetermined diameter and/or a predetermined weight.
  • a plurality of final rolled coils are obtained.
  • Each final rolled coil has a diameter and/or weight lower than the mega coil.
  • the rotating platform is arranged directly downstream of the at least one welder.
  • a pickling apparatus between the at least one first welder and the rotating platform; preferably only the pickling apparatus is arranged between the least one first welder and the rotating platform.
  • the plant of the invention comprises only one rotating platform.
  • the cutting means there are only provided the cutting means.
  • the rotating platform is provided with blocking means to block the tail of the mega coil just wound on each of the third reel and fourth reel.
  • the rotating platform comprises a respective deflector roller for each of the third and fourth reels, on which deflector roller the tail of the mega coil just wound is blocked, due to a corresponding pressure roller arranged above the deflector roller, to then rotate the platform and therefore the mega coil just wound in the unwinding position for feeding the rolling mill.
  • another welder or second welder, is provided, between rotating platform and rolling mill, for obtaining the rolling continuity between one mega coil and the next one.
  • the rotating platform is arranged directly between the al least one first welder and the second welder.
  • the rotating platform there is only the rotating platform between the at least one first welder and the second welder.
  • the plant of the present invention in all its embodiments comprises:
  • a rotating platform 3 is provided, arranged between the welding line and the cold rolling mill 9, which is configured to rotate about a vertical axis and is provided with two reels 4, 5 positioned on the rotating platform 3 so that alternatively reel 4 is used as winding reel of the strip coming from the welding line and reel 5 is used as strip unwinding reel for feeding the cold rolling mill 9.
  • a further advantage lies in the fact that the two reels 4, 5 are sized to wind a coil weighing from 80 to 200 metric tons and/or with a diameter of up to 6 meters, defined mega coil, made by the welding line by joining a plurality of coils coming from the reels 1.
  • the number of coils required to make the aforesaid mega coil may vary according to the length of the starting strips. Generally, there is a need of from three to six coils to obtain a mega coil.
  • the at least two first reels 1 have an external diameter comprised between 500 and 700 mm.
  • the at least two first reels 1 are actuated by a 50-100 kW motor, for example by a 75 kW motor.
  • the at least one second reel 11 or 11' has an external diameter comprised between 500 and 700 mm.
  • the at least one second reel is actuated by a 50-100 kW motor, for example by a 75 kW motor.
  • Reels 4, 5 are high capacity reels made, for example, with a high thickness tube or with a metal round bar capable of carrying the weight of large sized coils weighing up to 200 t or with a diameter of up to 6 meters.
  • the capacity of the reels 4, 5 is of 500 to 8000 meters of length of strip.
  • reels 4, 5 are configured to rotate always in the same rotation direction.
  • the two reels 4, 5 are integral with opposite ends or sides of the rotating platform 3 ( Figure 5 ), which is adapted to rotate by 180° about the vertical axis after a predetermined time in which a mega coil is wound, for example onto reel 4, and another mega coil is unwound from the other reel 5.
  • the power of the motors for winding and unwinding the mega coil onto/from the reels 4, 5 is selected so as to obtain a predetermined pulling action during the winding, preferably from 15 to 20 N/mm 2 , and to obtain a predetermined pulling action during the unwinding, preferably from 20 to 50 N/mm 2 , such to optimize the rolling process downstream.
  • the rotating platform 3 defines a dual system for winding/unwinding the strip.
  • the rotating platform can be actuated by means of e.g. a rack system.
  • the rotation of the platform 3 is controlled ( Figure 5 ) by an electric or hydraulic motor 32 which allows a rotation of 180° to be achieved.
  • the rotation commands 31, 30 and 31', 30' of the respective reels 4, 5 are independent from each other so as to independently control the winding rotation of the strip coming from the welding line and the unwinding rotation of the strip towards the rolling stands 19 of the cold rolling mill 9.
  • the strip wound onto and unwound from the reels 4, 5 is kept aligned and centered by an axial movement of a respective mandrel or slide 34, 34' controlled by a corresponding hydraulic cylinder 33, 33'.
  • a respective deflector roller 6, 6' is provided on platform 3 itself for each of the reels 4, 5 ( Figures 1 to 4 ), on which deflector roller the tail of the mega coil just wound is blocked, due to a corresponding pressure roller 16, 16' arranged above the deflector roller 6, 6', to then rotate platform 3 and therefore the mega coil just wound in the unwinding position for feeding the rolling mill.
  • a pickling apparatus may be optionally provided between welder 2 of the welding line and the rotating platform 3. In this case, it is preferable that between the welder 2 and the rotating platform 3 there is only provided the pickling apparatus.
  • An example of pickling apparatus is shown in Figure 7 , and comprises in sequence:
  • Strip guide systems, systems for controlling the pulling action, and various auxiliary systems are preferably provided along the pickling apparatus.
  • no pickling apparatus is provided between welder 2 and platform 3 if the coils received from the reels 1 were picked previously.
  • further cutting means for example a further shear (not shown), arranged upstream of the rotating platform 3 and configured to cut the strip once the mega coil has been wound onto one of the two reels 4, 5.
  • suitable sensors send a control signal to said further cutting means once the predetermined weight limit, in the range for example between 80 and 200 metric tons, or the predetermined coil diameter limit, in the range for example of 4 and 6 meters, is reached. After this cut, the rotating platform 3 is rotated by 180°.
  • sensors are weight sensors and/or coil diameter sensors.
  • a serpentine path 25 ( Figure 7 ) may be provided upstream of said further cutting means, with idler rollers 26 of the pickled continuous strip, whose purpose is to store the strip processed by the pickling apparatus each time the winding reel 4 or 5 stops.
  • Said serpentine path 25 is possibly provided directly:
  • the equipment for guiding and centering the strip at the inlet of the rolling mill preferably is provided with a first three-roller centering device 7 and with a second two-roller centering device 8 which, with their conveniently motorized respective pressure rollers 7', 8', help the feeding of the strip into the first of the rolling stands 19.
  • Auxiliary systems for cooling and lubricating the strip and further auxiliary systems for monitoring the rolling process can be provided along the rolling mill.
  • the cutting shear 10 is a static cutting shear which cuts the strip being wound onto reel 11.
  • a further welder 2' preferably of the laser type, is provided in addition to all the components provided in the first embodiment.
  • This further welder 2' is arranged between the rotating platform 3 and the cold rolling mill 9 and is configured to weld the tail of a first mega coil entering the rolling mill to a head of a second mega coil coming from reel 4 or reel 5.
  • welder 2' is arranged between the rotating platform 3 and the equipment for guiding and centering the strip at the inlet of the rolling mill, preferably between the deflector roller-pressure roller pair of the reel 4 or 5 in the unwinding step and the first roller centering device 7.
  • the third embodiment of the plant of the invention (shown in Figure 3 ) is equal to the first embodiment, except that it provides:
  • the further welder 2' preferably of the laser type, is provided in addition to all the components provided in the third embodiment.
  • this further welder 2' is arranged between the rotating platform 3 and the cold rolling mill 9 and is configured to weld the tail of a first mega coil entering the rolling mill to a head of a second mega coil coming from reel 4 or reel 5.
  • welder 2' is arranged between the rotating platform 3 and the equipment for guiding and centering the strip at the inlet of the rolling mill, preferably between the deflector roller-pressure roller pair of the reel 4 or 5 in the unwinding step and the first roller centering device 7.
  • the unwinding reels 1 unwind respective strips which are welded to each other by means of welder 2, thus defining a continuous strip.
  • the continuous strip is stored in the inlet storing means 20 to ensure the continuous operation of the pickling process.
  • the continuous strip still covered by an oxide layer, exiting from the storing means 20, crosses the scale breaker 4 where, through the combined action of pulling and alternating bending about rollers of a suitable diameter, it is obtained the crushing of the oxide layer, thus promoting the successive etching in the pickling tanks 22.
  • the continuous strip passes through the pickling tanks 22 and afterwards is rinsed and dried.
  • the pickled continuous strip enters the intermediate storing means 23 and then crosses the edge trimming machine 24 and the serpentine path 25.
  • the continuous strip is wound onto high capacity reel 4 or 5 of the rotating platform 3 immediately downstream of welder 2 or of the pickling apparatus.
  • Fig. 6 diagrammatically depicts the working sequence of the rotating platform 3 in working regime.
  • a first step Fig. 6a
  • reel 4 starts winding a mega coil of strip
  • reel 5 starts unwinding another mega coil, wound previously, towards the rolling stands 19 so as to start the rolling.
  • a second step while the rolling mill completes rolling the mega coil and reel 5 is empty, reel 4 completes winding the other mega coil of strip; the strip is cut upstream of the rotating platform 3 by means of said further cutting means; and the rotating platform 3 begins rotating to bring reel 4 into the unwinding position of the strip towards the rolling stands 19.
  • the platform 3 causes the deflector roller 6 and related pressure rollers 16 to rotate with it so that the tail of the mega coil wound on reel 4 is already ready for the successive unwinding, thus becoming the head of the mega coil to be directed to the rolling mill.
  • a third step with reel 4 in the unwinding position, the strip is unwound from reel 4 and brought to the second position for feeding the rolling mill, while reel 5 begins winding a new mega coil of strip.
  • the head of the mega coil of strip which is unwound from the rotating platform 3 is pushed in a coordinated manner by reel 4 and by the deflector roller 6, thus passing through the three-roller centering device 7 and the two-roller centering device 8 which, with their pressure rollers 7', 8', help with feeding the strip to the rolling mill.
  • the head of the mega coil then crosses the tandem cold rolling mill 9, the static cutting shear 10 and is wound onto the winding reel 11 ( Figure 1 ).
  • the rolling mill 9 begins rolling.
  • sensors send a control signal to said cutting means each time a portion of rolled strip wound on the at least one second reel 11 reaches said predetermined coil weight limit or said predetermined coil diameter limit.
  • sensors send a control signal to the static cutting shear 10 which performs a separation cut, thus cutting the strip, and a first rolled coil, for example with specific weight from 10 to 21 kg/mm or with a diameter of about 2000 - 2100 mm, is unloaded from the winding reel 11.
  • sensors are weight sensors and/or coil diameter sensors.
  • the rolled strip head obtained exiting from the rolling stands 19 is fed onto reel 11 and rolling is resumed up to obtaining a second rolled coil on reel 11 having a specific weight from 15 to 21 kg/mm or with a diameter of 2000 - 2100 mm.
  • the rolling stands 19 are opened, the static cutting shear 10 cuts the rolled strip again and said last rolled coil having a specific weight from 15 to 21 kg/mm or with a diameter of 2000 - 2100 mm is unloaded from reel 11.
  • the welding is provided of a tail of a mega coil entering the rolling mill with a head of a next mega coil coming from the rotating platform 3.
  • This welding is executed by means of welder 2', which is arranged between the rotating platform 3 and the cold rolling mill 9, and results in benefits in reducing the feeding times for the next mega coil since the head of the latter is pulled by the tail of the previous mega coil, thus increasing the continuity of rolling.
  • a flying cutting of the rolled strip is provided by means of the flying cutting shear 12 when the rolled coil wound on one of the reels 11' reaches the size or the specific weight provided by the automation.
  • the two reels 11' allow that, while a rolled coil is unloaded from a first reel 11', the head of a new rolled coil to be wound onto the second reel 11', with obvious benefits in the quality and productivity of the plant. This allows a continuous rolling for the individual mega coil to be achieved.
  • a continuous rolling is instead achieved for a continuous series of mega coils, such a plant providing the use of the further welder 2' and of the flying cutting shear 12 and of the double reel 11', or of the carousel 13 of reels 11'.
  • the welding line generates, by means of welder 2, a continuous strip starting from coils coming from the reels 1.
  • the welding line could generate a series of separate strips, in which each of these strips exiting welder 2 is formed by the union of, for example, from three to six coils coming from the reels 1 suitable for forming a single mega coil.
  • the further cutting means immediately upstream of the rotating platform 3 are no longer required.
  • the serpentine path 25 is possibly directly provided:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
EP17156641.7A 2016-02-18 2017-02-17 Combined welding and rolling plant for metallic strips Active EP3208005B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2016A000862A ITUB20160862A1 (it) 2016-02-18 2016-02-18 Impianto combinato di saldatura e laminazione di nastri metallici

Publications (2)

Publication Number Publication Date
EP3208005A1 EP3208005A1 (en) 2017-08-23
EP3208005B1 true EP3208005B1 (en) 2020-01-29

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Family Applications (1)

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EP17156641.7A Active EP3208005B1 (en) 2016-02-18 2017-02-17 Combined welding and rolling plant for metallic strips

Country Status (4)

Country Link
EP (1) EP3208005B1 (ja)
JP (1) JP6514249B2 (ja)
CN (1) CN107088580B (ja)
IT (1) ITUB20160862A1 (ja)

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CN108747111B (zh) * 2018-06-15 2023-10-20 宁波市创捷自动化有限公司 一种用于卷料对接的自动焊接装置

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Also Published As

Publication number Publication date
EP3208005A1 (en) 2017-08-23
CN107088580A (zh) 2017-08-25
JP6514249B2 (ja) 2019-05-15
ITUB20160862A1 (it) 2017-08-18
CN107088580B (zh) 2020-05-15
JP2017148869A (ja) 2017-08-31

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