US20150135790A1 - Method for the Cold Deformation of a Continuous Metal Strip - Google Patents

Method for the Cold Deformation of a Continuous Metal Strip Download PDF

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Publication number
US20150135790A1
US20150135790A1 US14/605,448 US201514605448A US2015135790A1 US 20150135790 A1 US20150135790 A1 US 20150135790A1 US 201514605448 A US201514605448 A US 201514605448A US 2015135790 A1 US2015135790 A1 US 2015135790A1
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United States
Prior art keywords
strip
bending
deformation
bending device
devices
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Abandoned
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US14/605,448
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English (en)
Inventor
Ivan T. TOTSKY
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Individual
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Individual
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    • 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
    • B21D1/05—Stretching combined with rolling

Definitions

  • the invention relates to the processing of metals without machining, in particular, to the production of a metal strip by cold deformation.
  • a method of cold deformation of a continuous metal strip is known in the manufacture of seamed tubes, including the drawing of the strip by a pulling mechanism between three non-driven rollers of a bending device, wherein the middle roller, having a diameter less than the diameter of the outer rollers, together with the strip encircling more than 180° of its circumference, is forced by the tension of the strip against the outer rollers having a gap between them greater than two thicknesses of the strip (USSR Inventor's Certificate No. 1500405, pub. Aug. 15, 1989).
  • a disadvantage of the known method is the lack of control over the magnitude of the deformation of the strip.
  • a method of cold deformation of a continuous metal strip is known in the manufacture of seamed tubes, including the application of backward and forward tension created respectively by tensioning and pulling mechanisms to draw the strip between three non-driven rollers of a bending device, wherein the middle roller has a diameter less than the diameter of the outer rollers, is encircled by the strip to more than 180° of its circumference and is forced together with the strip, by the tension of the strip, against the outer rollers having a gap between them greater than two thicknesses of the strip, with the ability to regulate the magnitude of the deformation of the strip by adjusting its tension while maintaining the forward tension below the level of tensile stress in the drawn strip corresponding to 0.85 of the tensile yield strength of its metal (Chinan patent for invention No. 2412016, pub. Feb. 20, 2011)—the prototype.
  • the prototype provides the ability to regulate the magnitude of the deformation of the strip, but its disadvantage is the low magnitude of strip deformation and the increased specific energy consumption per unit of strip deformation.
  • FIG. 1 is a schematic illustration of a structure for implementing a method of cold deformation of a continuous metal strip.
  • the aim of the present invention is to increase the magnitude of the strip deformation and to decrease the specific energy consumption per unit of strip deformation.
  • the method for cold deformation of a continuous metal strip includes drawing of the strip under backward and forward tension between three non-driven rollers of each bending device, wherein the middle roller, having a diameter less than the diameter of the outer rollers, is encircled by the strip to more than 180° of its circumference and is forced together with the strip, by the tension of the strip, against the outer rollers having a gap between them greater than two thicknesses of the strip, with the ability to regulate the magnitude of the deformation of the strip by adjusting its tension while maintaining the forward tension below the level of tensile stress in the drawn strip corresponding to 0.85 of the tensile yield strength of its metal.
  • the novelty of the method is in fact that the strip is successively drawn through a group of bending devices comprising, at least, two bending devices, and through each of the separate bending devices, at least, through one separate bending device.
  • the strip is drawn under backward and forward tension in each bending device of the group and in each separate bending device.
  • the drawing is effected by means of a tensioning device mounted before the inlet side of the first bending device of the group in the process stream, auxiliary pulling devices, the first of which is mounted at the exit side of the last bending device of the group and all the rest are placed at the exit side of each separate bending device except the last one, and the pulling device mounted at the exit side of the last separate bending device.
  • the magnitude of strip deformation is regulated in the group of bending devices and in each separate bending device within ranges, the upper boundary of which does not exceed the maximum permissible elongation ratio of the strip, respectively, for the group of bending devices and for each separate bending device.
  • Deformation is regulated therein by change of the ratios, respectively, of the speed of the strip exiting the last bending device of the group to the speed of its entry into the first bending device of the group, and the speed of the strip exiting each separate bending device to the speed of its entry into that bending device.
  • the magnitude of strip deformation is increased several fold, and the specific energy consumption per unit of strip deformation is decreased several fold in the proposed method.
  • the number of bending devices in the group increases, the increase in deformation and the reduction in the specific energy consumption are diminishing, while their operating costs increase; therefore, the number of bending devices in the group is selected on the basis of the lowest total costs.
  • Reduction of specific energy consumption per unit of strip deformation increases as the number of bending devices in the group increases because, given the constant magnitude of the forward tension, the total deformation of the strip in this group of devices increases.
  • a significant portion of the forward tension on the order of 80%, which remains after overcoming the resistance to its deformation in the last bending device of the group, is forward tension that draws the strip through the remaining bending devices of the group.
  • the magnitude of strip deformation therein is substantially lower than in the last bending device of the group; however, it increases the total deformation of the strip in the group of bending devices, thereby reducing the specific energy consumption per unit of its overall deformation. Additional increase in the number of the bending devices in the group (above these two devices) will increase the magnitude of strip deformation therein, which will additionally reduce the specific energy consumption per unit of its deformation. An increase in the number of bending devices within the group reduces the magnitude of the required backward tension of the strip applied by the tensioning device.
  • the maximum permissible strip elongation ratio depends mainly on the ratio of the strip thickness to the diameter of the middle roller. The greater the thickness of the strip and smaller the diameter of the middle roller, the greater is the maximum permissible elongation ratio of the strip.
  • the maximum permissible elongation ratio of the strip in the group of bending devices depends on their number in the group. The greater their number in the group, up to an optimum limit, the greater the maximum permissible elongation ratio of the strip in the group of bending devices.
  • the required number of separate bending devices depends on the specified overall elongation ratio of the strip and on the maximum permissible elongation ratio of the strip, both in the group of bending devices and in each of the remaining separate bending devices.
  • the drawing shows a diagram of the embodiment of the proposed method of cold deformation of a metal strip by means of a tensioning device, a group of bending devices comprising two bending devices, three separate bending devices, three auxiliary pulling devices, and a pulling device.
  • a continuous metal strip 6 is being sequentially drawn under backward and forward tension between three non-driven rollers of each bending device 7 and 8 of a group and each separate bending device 9 , 10 , and 11 .
  • Similar action occurs during the deformation of the strip in the remaining bending devices.
  • part of the total tractive force including the tractive force of auxiliary pulling device 3 and the part of the tractive force of auxiliary pulling device 4 and of pulling device 5 remaining after deformation of strip 6 in bending devices 10 and 11 , is expended to overcome the resistance to the deformation of strip 6 in bending device 9 .
  • the remaining part of this total tractive force helps auxiliary pulling device 2 to overcome the resistance to the deformation of strip 6 in the group of bending devices 8 and 7 and the resistance of tensioning device 1 .
  • This remaining part of the total tractive force is simultaneously the backward tensioning of strip 6 at the point of its entry into bending device 9 .
  • the magnitude of the deformation of strip 6 in the group of bending devices 7 and 8 is regulated by changing the ratio of its exit speed from this group, which is provided by auxiliary pulling device 2 , to its entry speed into this group of bending devices, provided by tensioning device 1 .
  • This change is effected within a range, the upper boundary of which does not exceed the maximum permissible strip elongation ratio in this group of bending devices. That maximum elongation ratio of the strip at which the process of deformation is achieved without rupture is the maximum permissible.
  • the magnitude of the deformation of strip 6 in each separate bending device 9 , 10 , and 11 is regulated by changing the ratio of its exit speed from the corresponding bending device to its entry speed into this device.
  • the regulation is effected within a range, the upper boundary of which does not exceed the maximum permissible strip elongation ratio for each of these bending devices.
  • each bending device 9 , 10 , and 11 is regulated, respectively, with the aid of auxiliary pulling devices 3 and 4 and of pulling device 5 .
  • the entry speed of the strip into each bending device 9 , 10 , and 11 is regulated with the aid of auxiliary pulling devices, respectively, 2 , 3 , and 4 .
  • the overall deformation magnitude of the continuous initial strip is regulated so as to obtain, after deformation, its specified thickness regardless of the longitudinal gage variability of the initial strip.
  • Constant exit speed of strip 6 from bending device 8 of the group is provided with the aid of auxiliary pulling device 2 , while the entry speed of the strip 6 into bending device 7 of the group is regulated with the aid of tensioning device 1 , depending on the thickness of the initial strip at the inlet of this bending device.
  • This regulation is effected such that the thickness of the strip at the exit from bending device 8 of the group would be constant regardless of the initial longitudinal gage variability of the strip.
  • the ratio of the exit speed of strip 6 from bending device 8 to its entry speed into bending device 7 is maintained within a range, the upper boundary of which does not exceed the maximum permissible elongation ratio of strip 6 in the group of bending devices 7 and 8 .
  • the deformation of a strip With deformation of a strip by the proposed method, involving it being drawn through a group of bending devices comprising two bending devices and through each of three separate bending devices, the deformation of the strip, measured by the magnitude of its elongation in an experiment, increased 4.4-fold by comparison with the prototype, with a 1.6-fold increase in the total consumption of energy; the specific energy consumption per unit of deformation of the strip decreased 2.8-fold.
  • the proposed method for cold deformation of a continuous metal strip by comparison with the prototype, affords a several-fold increase in the magnitude of strip deformation and a several-fold decrease in the specific energy consumption for its deformation. Owing to this, the method can be used in place of cold rolling of a metal strip.
  • the pressure of the metal against the rollers in cold rolling is approximately 5-8 times greater than the pressure of the metal against the outer rollers of the bending device in cold deformation according to the proposed method. Therefore the weight of the equipment for cold deformation of a continuous metal strip according to the proposed method will be several times lower than the weight of the continuous cold rolling mill equipment. Accordingly, the cost of the equipment and the cost of plant construction will be several times lower as compared with the cost of the equipment and the cost of construction of the continuous rolling mill.
  • strip velocity in the backward creep zone is slower and in the forward creep zone is faster than the surface velocity of the working roll. Slippage of the strip relative to the rolls in said zones of the deformation region and the high roll-separating forces result in heavy wear of the rolls.
  • the rollers of each bending device create two deformation regions that are situated in the reversing areas of the strip bending direction. In these regions, the strip is subjected to shear deformation essentially without slippage relative to the rollers.
  • the absence of strip slippage relative to the rollers and the decrease in the roll-separating forces result in reduction of roll wear by dozens of times as compared with their wear in cold rolling of a strip. This will also make it possible to ensure low surface roughness of the strip. This especially affects the surface in contact with the middle rollers of the bending devices, since the middle rollers have a small diameter and, therefore, afford good processing of the strip surface.
  • the proposed method of cold deformation of a continuous metal strip makes it possible to reduce the expenditure of energy for its deformation by approximately 15-35%. Further, the magnitude of energy savings increases with decreasing the diameter of the middle rollers of the bending devices and with increasing, up to the optimal limit, the number of bending devices in their group situated in between the tensioning device and the first auxiliary pulling device in the process stream.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US14/605,448 2012-07-27 2015-01-26 Method for the Cold Deformation of a Continuous Metal Strip Abandoned US20150135790A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2012/000615 WO2014017944A1 (ru) 2012-07-27 2012-07-27 Способ холодной деформации непрерывной металлической полосы

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PCT/RU2012/000615 Continuation WO2014017944A1 (ru) 2012-07-27 2012-07-27 Способ холодной деформации непрерывной металлической полосы

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US20150135790A1 true US20150135790A1 (en) 2015-05-21

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US (1) US20150135790A1 (ru)
EP (1) EP2878391A4 (ru)
RU (1) RU2557843C2 (ru)
WO (1) WO2014017944A1 (ru)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332796A (en) * 1941-01-25 1943-10-26 Carnegie Illinois Steel Corp Reduction of elongated bodies
US3559431A (en) * 1968-02-15 1971-02-02 Bwg Bergwerk Walzwerk Apparatus for stretching continuous bands
US4665729A (en) * 1984-08-10 1987-05-19 Kabushiki Kaisha Toshiba Thickness control method and system for a single-stand/multi-pass rolling mill
US6240762B1 (en) * 1999-02-15 2001-06-05 Sumitomo Heavy Industries, Ltd. Method of leveling strips and leveling equipment of strips
US20090229334A1 (en) * 2006-03-24 2009-09-17 Michinori Hashizume Wire Drawing Machine and Method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT314453B (de) * 1971-07-09 1974-04-10 Bwg Bergwerk Und Walzwek Masch Verfahren und Vorrichtung zum Reduzieren von Blechbändern in Bandstraßen
RU1429410C (ru) * 1987-02-13 1994-10-15 Уральский научно-исследовательский институт трубной промышленности Способ производства труб на непрерывных трубоэлектросварочных агрегатах
RU1839118C (ru) * 1989-06-08 1993-12-30 Чел бинский политехнический институт им.Ленинского комсомола Способ прокатки металлической полосы
FR2715592B1 (fr) * 1994-02-01 1996-04-12 Clecim Sa Procédé et installation de planage d'une bande métallique mince.
DE19509067A1 (de) * 1995-03-14 1996-09-19 Bwg Bergwerk Walzwerk Verfahren zum kontinuierlichen Richten von dünnen Metallbändern, insbesondere von Aluminium- und Edelstahl-Bändern mit Banddicken von 0,1 mm bis 0,5 mm, und Richtanlage zur Durchführung des Verfahrens
DE10342798B3 (de) * 2003-09-16 2005-03-10 Siemens Ag Bandzugregelung in einer Behandlungslinie für Materialband, insbesondere Metallband
RU2351423C2 (ru) * 2007-03-06 2009-04-10 Открытое акционерное общество "Северский трубный завод" Способ изготовления труб на непрерывных трубосварочных агрегатах
DE102008045340A1 (de) * 2008-09-01 2010-03-04 Siemens Aktiengesellschaft Betriebsverfahren für einen Streckrichter mit überlagerter Elongationsregelung und unterlagerter Zugregelung
RU2412016C1 (ru) 2010-03-01 2011-02-20 Открытое акционерное общество "Северский трубный завод" Способ изготовления труб на непрерывных трубосварочных агрегатах

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332796A (en) * 1941-01-25 1943-10-26 Carnegie Illinois Steel Corp Reduction of elongated bodies
US3559431A (en) * 1968-02-15 1971-02-02 Bwg Bergwerk Walzwerk Apparatus for stretching continuous bands
US4665729A (en) * 1984-08-10 1987-05-19 Kabushiki Kaisha Toshiba Thickness control method and system for a single-stand/multi-pass rolling mill
US6240762B1 (en) * 1999-02-15 2001-06-05 Sumitomo Heavy Industries, Ltd. Method of leveling strips and leveling equipment of strips
US20090229334A1 (en) * 2006-03-24 2009-09-17 Michinori Hashizume Wire Drawing Machine and Method

Also Published As

Publication number Publication date
EP2878391A4 (en) 2016-03-30
RU2557843C2 (ru) 2015-07-27
WO2014017944A1 (ru) 2014-01-30
RU2013147504A (ru) 2015-04-27
EP2878391A1 (en) 2015-06-03

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