US3777532A - Method of and apparatus for extending and reducing thickness of a metallic band - Google Patents

Method of and apparatus for extending and reducing thickness of a metallic band Download PDF

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Publication number
US3777532A
US3777532A US00269775A US3777532DA US3777532A US 3777532 A US3777532 A US 3777532A US 00269775 A US00269775 A US 00269775A US 3777532D A US3777532D A US 3777532DA US 3777532 A US3777532 A US 3777532A
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United States
Prior art keywords
band
roll
bending
rolls
tensile strength
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Expired - Lifetime
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US00269775A
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English (en)
Inventor
O Noe
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BERG und WALZWERK MASCHINEN
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BERG und WALZWERK MASCHINEN
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Priority claimed from DE19712134405 external-priority patent/DE2134405C3/de
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    • 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
    • B21B1/222—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 rolling-drawing process; in a multi-pass mill
    • 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
    • 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 band is bent back and forth through increasingly smaller radii of curvature causing lowering of the bands elastic limit at the bend and plastic flow and elongation thereat.
  • the band engages each roll over an are preferably greater than 5 and the diameter D of each roll or of each set of roll is calculated according to the formula:
  • a sheet-metal band or strip is customarily made thinner and longer by the process of cold-rolling wherein pair immediately upstreamhThe work done by the rolls is consumed approximately one-half for plastic deformation of the band, and one-half in the production of useless heat of compression which must be conducted away from the work to prevent the temperature rise thereof beyond an optimal maximum.
  • Such a system is highly wasteful of energy.
  • the rolls are extremely expensive and require frequent replacementand/or refinishing because, under the enormous compressive forces to which they are subjected, they tend to "wear rapidly. It is common practice to back up the working rolls which define the working gap with large-diameter support rolls. The working rolls often must be replaced daily in a large cold-rolling installation, and the support rolls every few weeks. Thus the rolling string is often out of service and the output of the mill is limited.
  • Customary rolling installations are controlled by highly expensive devices which regulate the working gaps and circulate the various coolants, keeping these coolants, which are necessarily sprayed on the workpiece in the gaps, clean and cool.
  • the power consumption is often in the neighborhood of 15,000 to 20,000 kilowatts, with very heavy-duty transformer switching and rectifi cation stations necessary. The cost of'the electrical control and power installations may thus approach the cost of the mechanical parts of the system.
  • Such a method is perfectly efficient for straightening a bent band but has little effect on either the length, width, or thickness of the band.
  • Y OBJECTS or THE INVENTION lt' is therefore an object of the present invention to provide an improved method of reducing the thickness of a band.
  • Yetanother'object is to provide an installation which issimple'and inexpensive tomake and operate.
  • each bending roll is situated so with respect to the rolls immediately upstream and downstream that a pair of imaginaryplanes both crossing the workpiece path and tangentto the middle roller and each tangent to a respective flanking roller define an arc B of at least 25 on the middle roller between their contact lines thereon.
  • the band only engages an are 'a slightly larger than 5 on the this middle roll.
  • the arc a and the arc B areinterdependent so that they increase and decrease together according to a function which is primarily deter'rnined by the rigidity of the strip.
  • the strip tension is a factor which determines the angular size of these arcs; the greater the longitudinal tension in the band, the greater these arcs will be.
  • the actual contact angle [3 here is much smaller than the theoretical contact angle a.
  • D (h E)/(K k5) wherein D is the rolls diameter, h is the band thickness in cm, E is the modulus of elasticity in kg/cm k is the mean tensile strength in kg/cm, and K is a constant from 25 to 50.
  • a longitudinal tension is exerted on the band which is of the order of 80 percent at most of the band mean tensile strength.
  • Such an arrangement functions at high or low throughput speeds so that it may be combined with galvanizing equipment or any other continuous operations. It is also possible to stop the band and start it up again with no noticeable effect on the finished product.
  • the band after such stretching is immediately subjected to a straightening operation, and even to a cold-rolling operation to eliminate any minor irregularities in thickness.
  • the device Since a relatively small amount of the energy exerted is transformed into heat in comparison to the amount working to stretch the band, the device is highly efficient. No complicated cooling arrangement need be provided, neither need any complicated devices to regulate the positioning of the rolls be connected to the apparatus.
  • the rolls can, according to another feature of this invention, be of constantly decreasing diameter in the direction of workpiece travel. Alternately they can be arranged in groups of four or more rollers all of the same size, with the downstream group smaller. The roll size can even decrease in each group, with the furthest downstream roll of one group being slightly larger than the furthest upstream roll of the next group downstream. In any case it has been found advantageous according to yet another feature of the present invention to provide auxiliary drive or advancing means between each two groups to ensure good advance of the band.
  • FIG. 1 a steel band 18 is unwound from a braked drum 1 and eventually wound up on a driven drum 2, passing in a transport direction 29 through the apparatus.
  • a shear 3 and a welding device 4 are provided immediately downstream of the drum 1 in order to cut off the end of this band 18 and attach the leading edge of another such band thereto.
  • Another such shear 5 is provided immediately upstream of the takeup drum 2.
  • Two gripping and driving arrangements 6 and 7 are provided at the upstream and downstream ends, respectively, of the apparatus, and are equipped with respective drive motors 6a and 7a which drive the upstream device 6 slower than the downstream one, the speed differential being sufficient to stress the band 18 in direction 29 to at most 80 percent of its mean tensile strength.
  • My copending application Ser. No. 139,575, filed May 3, 1971 and my U.S. Pat. No. 3,559,431 describe drives suitable for use with this invention.
  • the band I8 runs through six different groups 8fof rolls 9 14 respectively.
  • the rolls 9 are of greater diameter than the rolls It) and so on with the rolls 14 being the smallest.
  • Large driven rolls 15a 15e separate the bending units 8a 8f from one another.
  • the furthest downstream bending unit 8f is followed by a pair of straighteners 16a and 16b of conventional type flanking a conventional cold-rolling unit 17 serving to eliminate any minor imperfections in the band 18.
  • FIGS. 3 and 4 show the bending units 8a 8c in greater detail, with the unit 8b shown in its entirety.
  • the rolls 10 of this unit comprise three upper rolls 10a, 10a" and IOa, and two lower rolls lllb and 10b".
  • the roll 10a is larger than the roll 10b, with the roll 10a being the smallest.
  • the roll Mia is smaller than the immediately preceding roll 9a and the roll I0a' is larger than the following roll Ila.
  • All of the upper rolls 10a Itla' are supported on rollers on flanges formed on a vertically displaceable framework 25 and the lower rollers 10b and 10b" are supported on rollers 10d carried on flanges formed on the frame 30 of the device.
  • a pair of hydraulic cylinders 26 can vertically displace the upstream end of the framework 25 and another pair of double-acting cylinders 27 support the downstream end. Since rolls 10b and 10b" are rotatable about respective axes lying in a common horizontal plane, and the rotation axes of the rolls 10a 10a are coplanar and parallel to the framework support 25, tilting of the support 25 by the cylinders 26 and 27 to the horizontal will change the gapping of the rolls of the bending bending unit 8b.
  • the leading end of the beam 25 is depressed by the cylinder 26 less than the trailing end to ensure a tighter bend at this trailing end. Also when a new workpiece 18 is to be threaded through the apparatus the beams 25 are fully raised.
  • FIG. 2 is essentially identical to FIG. with the same reference numerals being used for identical structure whenever applicable.
  • the band 18 After leaving the welding unit 4 the band 18 passes between two sets of tensioning rollers 19 flanking a straightener 20. Thereafter the band passes through a storage area 21 and into a pickling bath 22, whence it passes through the drive 6, the bending units 8a 8f, the straighteners 16a and 16b, the rolling apparatus 17 and the drive 7 to another storage area 23.
  • a galvanizing station 31 is provided immediately downstream of the storage area 23 followed by another pair of tensioning rollers 24, the shear 5, and the takeup spool 2.
  • all of the rolls 9 are of the same diameter, as are the rolls 110, and so on.
  • a decrease in the bending radius in the transport direction is obtained exclusively by tilting the plane of the axes of the upper rolls relative to that of the lower rolls with the cylinders 26 and 27.
  • FIG. 5 shows how the band passes through three rolls 9.
  • the band 18 perfectly elastic it would assume the position shown by dashed lines 28, engaging the middle roll over an arc a of 65.
  • the inherent stiffness of the band 18 causes it to assume a sinusoidal path between two rolls so that it only engages the roll over an arc B of about 30. In straighteners a much smaller contact are is used.
  • the are B should exceed 5 and are a should be greater than 25. Since are a is substantially equal to that are defined with reference to the middle rollers rotation axis by a pair of planes tangent to it and to the neighboring rolls, it can be seen that adjustment can be achieved either by displacing the rolls toward each other in the transport direction ,or raising or lowering every other roller relative to its neighbors. This latter method is the most efficient and practical solution.
  • the band is made longer, narrower, and thinner as it passes through the several bending units.
  • the thickness may be decreased by around 70 percent while the width is reduced by 30 percent without exceeding the brittle-fracture point.
  • the relative reduction is of a lesser degree since the tensile strength is increased and the reduced thickness, even with increasingly tighter bends, is less susceptible to flow during bending.
  • a device as shown in FIGS. 1 5 can reduce its thickness depending on the setting of the rolls from to 100 percent.
  • the thicker bands are passed through all five bending units; thinner ones need only pass through the last three or four. Similarly, if the desired thickness is obtained, the last several bending units may not be used.
  • a method of stretching a metallic band comprising the steps of:
  • An apparatus for stretching a metallic band comprising:
  • each of said means for locally bending said band includes a pair of guide rolls flanking the respective bending roll.
  • each bending roll has a diameter D dimensioned according to the formula:
  • h is the thickness in cm of the band fed to the respective guide roll
  • E is the modulus of elasticity of the band in kg/cm
  • k is the mean tensile strength of the band in kglcm
  • K is a constant between 25 and 50.
  • each of said bending rolls engages said band over an arc of more than 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Control Of Metal Rolling (AREA)
US00269775A 1971-07-09 1972-07-07 Method of and apparatus for extending and reducing thickness of a metallic band Expired - Lifetime US3777532A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712134405 DE2134405C3 (de) 1971-07-09 Verfahren und Vorrichtung zum Reduzieren von Blechbändern in Bandstraßen

Publications (1)

Publication Number Publication Date
US3777532A true US3777532A (en) 1973-12-11

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US00269775A Expired - Lifetime US3777532A (en) 1971-07-09 1972-07-07 Method of and apparatus for extending and reducing thickness of a metallic band

Country Status (7)

Country Link
US (1) US3777532A (en:Method)
JP (1) JPS5010827B1 (en:Method)
AT (1) AT314453B (en:Method)
BE (1) BE783776A (en:Method)
FR (1) FR2154402B1 (en:Method)
GB (1) GB1379265A (en:Method)
IT (1) IT962562B (en:Method)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902648A (en) * 1973-12-28 1975-09-02 Interlake Inc Variable width strip conditioner
DE3241995A1 (de) * 1981-11-13 1983-05-26 Sumitomo Metal Industries, Ltd., Osaka Verfahren zum korrigieren von gewalztem material
US4457149A (en) * 1981-03-26 1984-07-03 Veest-Alpine Aktiengesellschaft Apparatus for producing coils of metal strip
US4489137A (en) * 1982-07-19 1984-12-18 Institut Francais Du Petrole Process for increasing the resistance to cracking corrosion of elongate elements such as armorings of flexible pipes or cables and the resultant products
JPS62104626A (ja) * 1985-11-01 1987-05-15 Mitsubishi Heavy Ind Ltd ストリツプ形状矯正装置
JPS62104612A (ja) * 1985-11-01 1987-05-15 Mitsubishi Heavy Ind Ltd ストリツプ形状矯正装置
FR2605254A1 (fr) * 1986-10-15 1988-04-22 Bwg Bergwerk Walzwerk Procede et train de laminage pour la fabrication de bandes metalliques dans un processus de laminage
US4870850A (en) * 1986-09-09 1989-10-03 Kawasaki Steel Method and device for leveling metal strip to be fed into continuous annealing furnace
EP0508475A3 (en) * 1991-04-12 1992-12-02 Sumitomo Heavy Industries, Ltd Tension roller leveler
US6006573A (en) * 1996-05-10 1999-12-28 Van Merksteijn; Jacobus Lambertus Driven ductility machine
US6240762B1 (en) * 1999-02-15 2001-06-05 Sumitomo Heavy Industries, Ltd. Method of leveling strips and leveling equipment of strips
US6668610B2 (en) * 2001-12-27 2003-12-30 Alcan International Limited Method for continuous tension leveling of aluminum strip
US6694792B2 (en) * 2000-07-11 2004-02-24 Canon Kabushiki Kaisha Substrate treatment process
US20040159994A1 (en) * 2001-04-24 2004-08-19 Oliver Lenzen Method and device for the production of curved spring strip sections
US20050016241A1 (en) * 2003-05-23 2005-01-27 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method of and apparatus for the continuous stretch leveling of metallic strip
US20070079913A1 (en) * 2005-10-07 2007-04-12 Krajewski Paul E Method for improving formability of hexagonal close packed metals
WO2011029485A1 (fr) * 2009-09-09 2011-03-17 Siemens Vai Metals Technologies Sas Machine de planage a rouleaux multiples
US20120000264A1 (en) * 2007-11-13 2012-01-05 Hadley Industries Overseas Holdings Limited Sheet material
EP2878391A4 (en) * 2012-07-27 2016-03-30 Ivan Timofeevich Totsky COLD DEFORMATION METHOD OF UNINTERRUPTED METAL STRIP

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2536582C3 (de) * 1975-08-16 1979-08-09 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Wechseltraverse
FR2486540A1 (fr) * 1980-07-11 1982-01-15 Pechiney Aluminium Procede d'obtention de pieces embouties a caracteristiques mecaniques ameliorees en aluminium et ses alliages
DE3234160C2 (de) * 1982-09-15 1986-10-23 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh, 4100 Duisburg Verfahren und Warmbandstraße zum Herstellen von dünnem Metallband, insbesondere Metall-Breitband, aus Warmband

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060400A (en) * 1932-11-30 1936-11-10 Bethlehem Steel Corp Method of and apparatus for treating sheet metal
US3605470A (en) * 1969-01-27 1971-09-20 Natalis H Polakowski Pressure assisted tension roller leveler

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060400A (en) * 1932-11-30 1936-11-10 Bethlehem Steel Corp Method of and apparatus for treating sheet metal
US3605470A (en) * 1969-01-27 1971-09-20 Natalis H Polakowski Pressure assisted tension roller leveler

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902648A (en) * 1973-12-28 1975-09-02 Interlake Inc Variable width strip conditioner
US4457149A (en) * 1981-03-26 1984-07-03 Veest-Alpine Aktiengesellschaft Apparatus for producing coils of metal strip
DE3241995A1 (de) * 1981-11-13 1983-05-26 Sumitomo Metal Industries, Ltd., Osaka Verfahren zum korrigieren von gewalztem material
US4651549A (en) * 1981-11-13 1987-03-24 Sumitomo Metal Industries, Ltd. Method for correcting rolled material
US4489137A (en) * 1982-07-19 1984-12-18 Institut Francais Du Petrole Process for increasing the resistance to cracking corrosion of elongate elements such as armorings of flexible pipes or cables and the resultant products
JPS62104626A (ja) * 1985-11-01 1987-05-15 Mitsubishi Heavy Ind Ltd ストリツプ形状矯正装置
JPS62104612A (ja) * 1985-11-01 1987-05-15 Mitsubishi Heavy Ind Ltd ストリツプ形状矯正装置
US4870850A (en) * 1986-09-09 1989-10-03 Kawasaki Steel Method and device for leveling metal strip to be fed into continuous annealing furnace
FR2605254A1 (fr) * 1986-10-15 1988-04-22 Bwg Bergwerk Walzwerk Procede et train de laminage pour la fabrication de bandes metalliques dans un processus de laminage
EP0508475A3 (en) * 1991-04-12 1992-12-02 Sumitomo Heavy Industries, Ltd Tension roller leveler
US6006573A (en) * 1996-05-10 1999-12-28 Van Merksteijn; Jacobus Lambertus Driven ductility machine
EP1029819A3 (en) * 1999-02-15 2001-12-12 Sumitomo Heavy Industries, Ltd. Method of and equipment for leveling strips
US6240762B1 (en) * 1999-02-15 2001-06-05 Sumitomo Heavy Industries, Ltd. Method of leveling strips and leveling equipment of strips
US6694792B2 (en) * 2000-07-11 2004-02-24 Canon Kabushiki Kaisha Substrate treatment process
US7013547B2 (en) * 2001-04-24 2006-03-21 Valeo Systemes D'essuyage Method and device for the production of curved spring strip sections
US20040159994A1 (en) * 2001-04-24 2004-08-19 Oliver Lenzen Method and device for the production of curved spring strip sections
US6668610B2 (en) * 2001-12-27 2003-12-30 Alcan International Limited Method for continuous tension leveling of aluminum strip
US7013693B2 (en) * 2003-05-23 2006-03-21 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method of and apparatus for the continuous stretch leveling of metallic strip
US20050016241A1 (en) * 2003-05-23 2005-01-27 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Method of and apparatus for the continuous stretch leveling of metallic strip
US20070079913A1 (en) * 2005-10-07 2007-04-12 Krajewski Paul E Method for improving formability of hexagonal close packed metals
US20120000264A1 (en) * 2007-11-13 2012-01-05 Hadley Industries Overseas Holdings Limited Sheet material
US9138796B2 (en) * 2007-11-13 2015-09-22 Hadley Industries Overseas Holdings Limited Sheet material
WO2011029485A1 (fr) * 2009-09-09 2011-03-17 Siemens Vai Metals Technologies Sas Machine de planage a rouleaux multiples
RU2518828C2 (ru) * 2009-09-09 2014-06-10 Сименс Фаи Металз Текнолоджиз Сас Многовалковая правильная машина
US9126250B2 (en) 2009-09-09 2015-09-08 Siemens Vai Metals Technologies Sas Leveling machine with multiple rollers
CN102481611B (zh) * 2009-09-09 2015-10-21 西门子奥钢联冶金技术有限公司 多辊平整机
EP2878391A4 (en) * 2012-07-27 2016-03-30 Ivan Timofeevich Totsky COLD DEFORMATION METHOD OF UNINTERRUPTED METAL STRIP

Also Published As

Publication number Publication date
DE2134405A1 (de) 1973-01-18
GB1379265A (en) 1975-01-02
IT962562B (it) 1973-12-31
JPS5010827B1 (en:Method) 1975-04-24
AT314453B (de) 1974-04-10
FR2154402B1 (en:Method) 1975-03-28
FR2154402A1 (en:Method) 1973-05-11
BE783776A (fr) 1972-09-18
DE2134405B2 (de) 1975-12-04

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