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
  • B21D7/00—Bending rods, profiles, or tubes
  • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
• • 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
  • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
  • B21D11/20—Bending sheet metal, not otherwise provided for
  • B21D11/206—Curving corrugated sheets

Definitions

• the invention relates to a method for curving a longitudinal metal sheet having a substantially flat portion with two opposite flanges along its sides.
• the invention also relates to an apparatus for curving a longitudinal metal sheet having a substantially flat portion with two opposite flanges along its sides.
• one or more of these objectives is reached with a method for curving a longitudinal metal sheet having a substantially flat portion with two opposite flanges along its sides, in which both flanges are pressurised at spots that are symmetrically situated opposite to each other, the pressure being successively exerted from the beginning to the end of the sheet to be curved, and in which the sheet is successively forced to bend in a section where the pressurised spots are present. Due to the pressure on the flanges, the metal at those spots becomes more or less fluidized, as a result of which it is relatively easy to deform the metal at these spots.
• the flanges at the fluidized spots can than easily be lengthened or shortened, and by doing so over the full length of the sheet to be curved the sheet is curved in a convex or concave form.
• an apparatus for curving a longitudinal metal sheet having a substantially flat portion with two opposite flanges along its sides comprising pressure means for pressurising the flanges of the sheet at spots that are symmetrically situated opposite to each other, bending means at both sides of the pressure means, and transport means for moving the sheet relative to the apparatus.
• pressure means are provided to pressurise the flanges at opposite spots, so the metal will become more or less fluidized at those spots, and the bending means will bend the metal sheet in convex or concave direction while the transport means move the sheet relative to the apparatus.
• the metal sheet will be curved in a simple and fast manner. Due to the fluidisation of the metal, the metal sheet can be given a convex or concave form, as required.
• the pressure means comprise pressure rolls that are provided at both sides of each flange.
• pressure rolls By using pressure rolls, pressure can be exerted on the flanges in a simple way, and the pressure rolls can simply roll over the flanges of the sheet as the sheet is moved relative to the apparatus. The pressure rolls press on a small spot, so the pressure is high and the can be easily controlled.
• the flanges often end in outward-bent rims that fit over the retaining clips.
• the pressure means comprise a pressure roll at the outside of each flange, a pressure roll at the inside of each flange, and a pressure roll at the outside of each rim.
• a flange is pressurised between both the outside pressure roll and the inside pressure roll, and the outside pressure roll and the rim pressure roll.
• the apparatus comprises a top plate for the pressure rolls for one flange, a bottom plate for the pressure rolls for the other flange, and connecting bars between the top and bottom plate. In this way, a compact and stiff apparatus is provided, making it possible to exert a high pressure on the flanges.
• the connecting bars are adjustable, so it is possible to curve flanged sheets with different widths.
• the transport means comprise movement rolls that fit over both longitudinal sides of the sheet, at both sides of the pressure means. The flanges and adjacent strips of the central portion of the metal sheet are thus clamped between the movement rolls, and rotation of the movement rolls will transport the metal sheet through the apparatus.
• the movement rolls at one side of the pressure means are adjustable sideways to the transport direction of a sheet relative to the apparatus, in which these movement rolls can function as bending means during use. By adjusting the adjustable movement rolls the radius of the curve of the metal sheet can be set as required for each specific building.
• the movement rolls have been rotatably connected to the top and bottom plate. When the distance between the top and bottom plate is adjusted, the movement rolls remain in the right place to clamp the flanges of the metal sheet.
• the apparatus comprises control means for controlling the pressure of the pressure means, the transport velocity of the transport means, and the degree of bending by the bending means.
• control means for controlling the pressure of the pressure means, the transport velocity of the transport means, and the degree of bending by the bending means.
• the control means can change the radius of the curvature during the operation, if this is necessary for the building for which the sheet is needed.
• Fig. 1 show the apparatus according to the invention schematically in front view.
• Fig. 2 shows the apparatus according to fig. 1 in vertical cross section along line A - A.
• Fig. 3 shows the apparatus according to fig. 1 in horizontal cross section along line B - B.
• Fig. 4 shows a metal sheet with flanges and rims in cross-section.
• Fig. 1 shows the apparatus 1 according to the invention in front view
• Fig. 1 shows the apparatus 1 according to the invention in front view
• FIG. 2 and Fig. 3 show apparatus 1 in vertical and horizontal cross section, respectively.
• a longitudinal metal sheet 100 is shown in ghost lines, and Fig. 4 shows this sheet 100 in cross section, the sheet having a substantially flat portion
• the apparatus 1 has a top plate 2, a bottom plate 3 and adjustable connecting bars 4. To both the top and the bottom plate two movement rolls 5, 5a and two movement rolls 6, 6a are rotatably attached, which rolls co-operate in pairs 5, 6; 5a, 6a to clamp a side of a metal sheet 100 between them.
• pressure rolls 8, 9 and 10 are present for each flange with rim of a metal sheet 100, as is best seen in Fig. 2.
• An outer pressure roll 8 supports the flange 102 with rim 103 and an adjacent portion of the flat portion 101 of the metal sheet 100. (For reasons of clarity, the metal sheet is not shown in Fig. 2.)
• the pressure rolls 8 are rotatably attached to the top and bottom plate, respectively.
• the pressure rolls 9 and 10 are supported by bearing shafts (not shown), with which it is possible to press the rolls 9 and 10 against the flanges and rims of the metal sheet which is supported by the rolls 8.
• the bars 4 are adjustable in height, so the top plate 2 is moveable in direction E so as to change the distance between the rolls on the top plate 2 and the rolls on the bottom plate 3. In this way it is simple to adjust the apparatus to a metal sheet with a different width.
• the movement rolls 5a, 6a are adjustable in direction F, as shown in Fig. 3. In this way the movement rolls 5a, 6a can be placed out of line with the movement rolls 5, 6 and the pressure rolls 8, 10.
• All pressure rolls 8, 9, 10 and movement rolls 5, 6; 5a, 6a are replaceable, for instance to curve a metal sheet with higher flanges 102.
• a straight longitudinal metal sheet 100 with flanges 102 and rims 103 is introduced into the bending machine 1 in direction D.
• the front end of the metal sheet is clamped between two pair movement rolls 5, 6, which rolls transport the sheet through the machine.
• the front end of the metal sheet 100 is thus introduced between the pressure rolls 8, 9 and 10 on both sides of the metal sheet 100.
• the front end of the metal sheet is transported further until it is clamped between the two pair movement rolls 5a, 6a.
• the pressure rolls 9, 10 are pressurised to press the flanges and rims of the metal sheet against the pressure rolls 8.
• the amount of pressure depends the kind of metal, the thickness of the metal sheet, the radius of the curvature that is required, and the transport velocity through the curving machine.
• the curving machine can be controlled in different ways. It is, for instance, possible to use hydraulic control for the rotation of the movement rolls and the pressure rolls and the adjustment of the movement rolls and the height of the adjustment bars. Alternatively it will be possible to control the curving machine electrically, or by a combination of hydraulic and electrical control.
• each movement roll can have its own supporting shaft ending in the top plate 2 or bottom plate 3.
• this has the disadvantage that each roll has to be driven , and that the top rolls 5, 5a must be synchronised with the bottom rolls 6, 6a. Therefore it is preferred that there are connecting shafts which connect each top roll with the accompanying bottom roll, in which way only the bottom rolls (or only the top rolls) have to be driven.
• These connecting shafts have to be adjustable to follow the adjusting of the adjustable connecting bars 4, and the connecting shafts have to be dismountable to change the movement rolls when a metal sheet with flanges with a different height or form must be curved.
• the curving machine can also be used for a flanged metal sheet with a changing cross-section, that is a changing distance between the flanges over the length of the metal sheet, such as a tapered metal sheet.
• a changing cross-section that is a changing distance between the flanges over the length of the metal sheet, such as a tapered metal sheet.
• only one of the flanges is fed through the curving machine and clamped between the movement rolls and the pressure rolls, and the other flange is not clamped and pressurised. After the first flange has been curved in this way, the other flange is fed through the movement and pressure rolls and curved.
• the curving machine can be used to curve for instance a tapered sheet in two runs.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Flanged Joints, Insulating Joints, And Other Joints (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8171280

Family Applications (1)

Country Status (10)

Cited By (3)

Families Citing this family (2)

Citations (2)

• 2000
  • 2000-03-31 EP EP00201162A patent/EP1138403A1/de not_active Withdrawn
• 2001
  • 2001-03-14 CN CN01807617.3A patent/CN1259159C/zh not_active Expired - Fee Related
  • 2001-03-14 AT AT01913885T patent/ATE330729T1/de active
  • 2001-03-14 WO PCT/EP2001/002961 patent/WO2001074508A1/en active IP Right Grant
  • 2001-03-14 CZ CZ20023207A patent/CZ20023207A3/cs unknown
  • 2001-03-14 EP EP01913885A patent/EP1272292B1/de not_active Expired - Lifetime
  • 2001-03-14 AU AU2001239300A patent/AU2001239300A1/en not_active Abandoned
  • 2001-03-14 DE DE60120947T patent/DE60120947T2/de not_active Expired - Lifetime
  • 2001-03-14 PL PL357908A patent/PL199572B1/pl not_active IP Right Cessation
  • 2001-03-14 ES ES01913885T patent/ES2265418T3/es not_active Expired - Lifetime
  • 2001-03-14 SK SK1402-2002A patent/SK286741B6/sk not_active IP Right Cessation

Patent Citations (2)

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