US3795127A - Method and apparatus for producing long flat metal strip from a coiled metal strip with uniform straight edges to a high degree of precision - Google Patents

Method and apparatus for producing long flat metal strip from a coiled metal strip with uniform straight edges to a high degree of precision Download PDF

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Publication number
US3795127A
US3795127A US00263949A US3795127DA US3795127A US 3795127 A US3795127 A US 3795127A US 00263949 A US00263949 A US 00263949A US 3795127D A US3795127D A US 3795127DA US 3795127 A US3795127 A US 3795127A
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United States
Prior art keywords
strip
bench
shearing
metal strip
longitudinal
Prior art date
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Expired - Lifetime
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US00263949A
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English (en)
Inventor
A Demus
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Imphy SA
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Creusot Loire SA
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Assigned to IMPHY S.A., A SOCIETE ANONYME OF FRANCE reassignment IMPHY S.A., A SOCIETE ANONYME OF FRANCE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CREUSOT-LOIRE
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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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D31/00—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines
    • B23D31/04—Shearing machines or shearing devices covered by none or more than one of the groups B23D15/00 - B23D29/00; Combinations of shearing machines for trimming stock combined with devices for shredding scrap
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7684—With means to support work relative to tool[s]
    • Y10T83/7693—Tool moved relative to work-support during cutting

Definitions

  • the uncoiled strip is straightened by trac- [51] II'IIL Cl 321d 43/28 tion to a degree g beyond its elastic limit laid [58] held of Search-m 72/294 3 flat unclamped on a bench, then immobilized on the 72/332; 83/425, 471.2, 67 175 bench and the edges trimmed by mobile shears movable on a longitudinal guide member lying parallel to [56] References C'ted the axis of the bench and the metal strip thereon.
  • the present invention relates to a method and apparatus for the manufacture from a coiled metal strip of very long metal strip with straight edges to a high degree of precision. As an example, it is particularly applicable to the problems encountered in the construction of high capacity storage or transport tanks for liquefied gases, such as the methane tankers for the seatransport of liquid methane at very low temperature.
  • Such tanks are constructed by welding long metal strips with a very low expansion coefficient and the construction specifications demand very exact precision for the straightness of the edges of the strip, the tolerance being of the order of i 0.5 mm per metre, non-accumulative; whatever may be the length of a strip, no point on the edge of that strip may be distant by more than 0.5 mm from the ideal straight line joining the two ends of this edge, and the inclination of the edge relative to this line is at most equal to 0.5 mm per metre on either side.
  • the strip has to be 30 metres long, but the development in the size of methane tankers means that we may now consider having in future to use strips up to 50 metres long. Such precision, over such a length, obviously cannot be obtained by longitudinal shearing prior to coiling at the end of the rolling-mill.
  • the starting material is a strip with a sword-edge distortion
  • the wastage will not be equally distributed on each side, and the stresses of the original strip will not be released symmetrically.
  • the strip obtained will be newly distorted, with deflections greater than the tolerance of i 0.5 mm per metre.
  • a process for straightening swordedge curved strip consisting of subjecting the strip, uncoiled in the flat, to a longitudinal, tractional force slightly greater than its limit of elasticity.
  • the permanent dis tortion resulting from this traction straightens the strip, making it symmetrical about a rectilinear axes, but generally leads to a slight width reduction in the central portion by contraction of cross-section, the two edges then exhibiting symmetrical curves, with a convexity facing the axis ofthe strip. It is not yet possible to effect longitudinal shearing with the precision imposed by passing the band into shears, for the strip could only be guided by contacting an edge which would itself be curved beyond the required tolerance.
  • the uncoiled strip is first straightened flat by traction to a degree slightly beyond its limit of elasticity and the strip is next laid flat, unelamped on a bench, then immobilized on this bench and the edges trimmed by mobile shears guided on a longitudinal member attached to the bench.
  • the invention also relates to the apparatus for carrying out the above method, this apparatus including a straightening bench capable of receiving the uncoiled metal strip and having a pair of devices for securing the opposite ends of the strip, at least one of these securing devices being connected to a traction device; the apparatus also includes a longitudinal shearing bench including a pair of sets of shearing means and means for raising the strip uniformly over its entire surface from the shearing bench, means for immobilizing the strip on the shearing bench, longitudinal guiding means parallel to the axis of the bench, at least one set of shearing means being each side of the shearing bench and transversely adjustable along and connected to longitudinal guide means, and drive means for longitudinal displacement of the shearing means.
  • a straightening bench capable of receiving the uncoiled metal strip and having a pair of devices for securing the opposite ends of the strip, at least one of these securing devices being connected to a traction device
  • the apparatus also includes a longitudinal shearing bench including a pair of sets of
  • FIG. 1 is a simplified elevation of a tensioning straightening bench
  • FIG. 2 is a simplified elevation of a shearing bench
  • FIG. 3 is a cross-section along the line III-III of FIG. 2.
  • strip I is held at one end in the self-closing jaws 2 of a unit 3 rigidly connected to the frame 4 of the machine.
  • Unit 3 also supports a ram device 5 for opening jaws 2.
  • a similar device with self-closing jaws 7 and opening rams 8 is mounted on a unit 9; however, this unit 9 is slidable on frame 4.
  • the anchoring points 11 of ram to frame 4 are multiple and uniformly distributed over the bench to allow different lengths of metal strip to be worked.
  • the shearing bench consists of a longitudinal beam supported on a series of blocks 21.
  • the resting plane of strip 1 is formed by the upper surfaces of a series of parallel, longitudinal beams 23 resting on beam 20.
  • Each longitudinal beam 23 has orifices 24 uniformly spaced along the whole length of the beam and alternately connected, by conduits 25 or 26, to a common longitudinal conduit 27 or 28, respectively.
  • Conduit 27 is connected to a compressor 30 driven by a motor 31.
  • Conduit 28 is connected to a vacuum pump driven by a motor not illustrated in the drawing, but which, simplified, would have the same appearance as the compressor and its drive motor in FIG. 2.
  • the bench On each side, the bench includes a guiderail of circular cross-section 33, which is perfectly rectilinear and parallel to the bench axis. Each guide-rail 33 is connected to blocks 21 by supports 34.
  • the mobile shearing device consists of a frame 35, the lateral surfaces of which are held captive on each lateral rail 33 by means of free-running rollers 36. Each side frame 35 supports a set of shears with two circular blades 41. Each set of shears 40 is transversely adjustable on slide bars 42 and is linked to a reduction drive motor 43 by a transmission 44.
  • mobile frame 35 On each side, mobile frame 35 is connected to the upper run of an endless chain 48 wound on a return drum 49 and a motive drum 50 driven by a motive device 51.
  • strip 1 which has just undergone straightening by drawing, is firstly placed in longitudinal beams 23.
  • the shearcarrying carriage 35 is obviously returned to one end of the bench, while the shears are opened to allow the maximum free space for manipulation of the strip while it is being set on the bench.
  • the strip has had to be coiled; when uncoiled on the shearing bench, the strip has necessarily had to be realigned to be exactly along the axis of the bench, and it is not certain that there do not remain in the entirely uncoiled strip local residual stresses due to the frictional forces of the strip on longitudinal beams 23.
  • Strip 1 is thus raised and as though floating above longitudinal beams 23, so that, when the supply of compressed air is discontinued, the strip falls back onto longitudinal beams 23 totally freely and without any stress remainmg.
  • the strip thus resting freely on the bench is then connected rigidly to the bench, using the other series of orifices 24 as suckers by starting the vacuum-pump, which aspirates through conduit 28 and conduits 26.
  • shears 40 are adjusted to the transversal position for the required final strip width and moved along the bench by movement of the supporting mobile frame assembly 35, driven by motive device 51.
  • Method for producing from a coiled strip a metal strip which has straight edges to a high degree of precision comprising the steps of straightening the uncoiled strip in the flat by traction to a point slightly beyond its limit of elasticity, placing the strip flat, without constraint, on a bench, raising the strip uniformly over its entire surface from the bench on an air cushion, and then immobilising the strip on the bench, the edges of the strip then being trimmed off by longitudinal shearing with mobile shears guided along a longitudinal member fixed to the bench.
  • Apparatus for producing from a coiled strip a metal strip which has straight edges to a high degree of precision comprising a straightening bench capable of receiving uncoiled metal strip and having a pair of devices for securing the opposite ends of the strip, at least one of the securing devices being connected to a traction device, and a longitudinal shearing bench including a pair of sets of shearing means, air cushion means for raising the strip uniformly over its entire surface from the shearing bench, means for immobilising the strip on the shearing bench, and longitudinal guiding means on and parallel to the axis of said shearing bench, at set of said shearing means being on each side of the shearing bench and transversely adjustable along and connected to said longitudinal guide means and drive means for longitudinal displacement of said shearing means.
  • said means for raising the strip on said shearing bench including a plurality of orifices uniformly distributed in the surface of said bench and a compressed air generator connected to said orifices for raising the strip uniformly over its entire surface from said shearing bench.
  • said means for immobilizing the strip on said shearing bench including a plurality of orifices uniformly distributed in the surface of said bench and a vacuum pump connected to said orifices for immobilising the strip on said shearing bench.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Accessories And Tools For Shearing Machines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
US00263949A 1971-08-11 1972-06-19 Method and apparatus for producing long flat metal strip from a coiled metal strip with uniform straight edges to a high degree of precision Expired - Lifetime US3795127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7129342A FR2148366B1 (enrdf_load_stackoverflow) 1971-08-11 1971-08-11

Publications (1)

Publication Number Publication Date
US3795127A true US3795127A (en) 1974-03-05

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US00263949A Expired - Lifetime US3795127A (en) 1971-08-11 1972-06-19 Method and apparatus for producing long flat metal strip from a coiled metal strip with uniform straight edges to a high degree of precision

Country Status (5)

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US (1) US3795127A (enrdf_load_stackoverflow)
JP (1) JPS529430B2 (enrdf_load_stackoverflow)
DE (1) DE2223035C3 (enrdf_load_stackoverflow)
FR (1) FR2148366B1 (enrdf_load_stackoverflow)
SE (1) SE393546B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582053A (en) * 1994-09-22 1996-12-10 Tapco International Corporation Combined portable sheet bending brake and cutter
AT511947B1 (de) * 2011-12-16 2013-04-15 Berndorf Band Gmbh Vorrichtung und verfahren zum besäumen eines metallbandes
FR3154937A1 (fr) 2023-11-07 2025-05-09 Gaztransport Et Technigaz Procédé et banc de fabrication d’une bande métallique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216629A (en) * 1939-08-24 1940-10-01 Haloid Co Slitting and cutoff mechanism for sheet material
US2477083A (en) * 1947-04-28 1949-07-26 Bigwood Joshua & Son Ltd Stretching machine for flattening metal strips
US2867260A (en) * 1953-01-12 1959-01-06 Ungerer Fritz Method for stretching and cutting sheet metal, and machine for carrying out the method
US3120915A (en) * 1960-06-20 1964-02-11 North American Aviation Inc Edge preparation machine and method
US3153962A (en) * 1962-06-18 1964-10-27 Lennox Ind Inc Method and apparatus for trimming edges of sheets
US3566932A (en) * 1967-03-30 1971-03-02 Guenther Papenmeier Process for rational production of size plates with a plate saw, in particular using an electronic control and device for practicing
US3612367A (en) * 1968-04-10 1971-10-12 Schloemann Ag Continuous longitudinal dividing or longitudinal trimming of metal plates
US3693489A (en) * 1971-03-25 1972-09-26 Gerber Garment Technology Inc Apparatus for cutting sheet material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216629A (en) * 1939-08-24 1940-10-01 Haloid Co Slitting and cutoff mechanism for sheet material
US2477083A (en) * 1947-04-28 1949-07-26 Bigwood Joshua & Son Ltd Stretching machine for flattening metal strips
US2867260A (en) * 1953-01-12 1959-01-06 Ungerer Fritz Method for stretching and cutting sheet metal, and machine for carrying out the method
US3120915A (en) * 1960-06-20 1964-02-11 North American Aviation Inc Edge preparation machine and method
US3153962A (en) * 1962-06-18 1964-10-27 Lennox Ind Inc Method and apparatus for trimming edges of sheets
US3566932A (en) * 1967-03-30 1971-03-02 Guenther Papenmeier Process for rational production of size plates with a plate saw, in particular using an electronic control and device for practicing
US3612367A (en) * 1968-04-10 1971-10-12 Schloemann Ag Continuous longitudinal dividing or longitudinal trimming of metal plates
US3693489A (en) * 1971-03-25 1972-09-26 Gerber Garment Technology Inc Apparatus for cutting sheet material

Also Published As

Publication number Publication date
DE2223035C3 (de) 1973-12-20
DE2223035B2 (de) 1973-06-07
JPS529430B2 (enrdf_load_stackoverflow) 1977-03-16
DE2223035A1 (de) 1973-02-22
JPS4826659A (enrdf_load_stackoverflow) 1973-04-07
FR2148366B1 (enrdf_load_stackoverflow) 1974-03-29
FR2148366A1 (enrdf_load_stackoverflow) 1973-03-23
SE393546B (sv) 1977-05-16

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AS Assignment

Owner name: IMPHY S.A., 8, RUE DE LA ROCHEFOUCAULD, 75009 , FR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CREUSOT-LOIRE;REEL/FRAME:003961/0485

Effective date: 19820318