EP0669174B1 - Machine for bending sheets of metal - Google Patents

Machine for bending sheets of metal Download PDF

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Publication number
EP0669174B1
EP0669174B1 EP95200333A EP95200333A EP0669174B1 EP 0669174 B1 EP0669174 B1 EP 0669174B1 EP 95200333 A EP95200333 A EP 95200333A EP 95200333 A EP95200333 A EP 95200333A EP 0669174 B1 EP0669174 B1 EP 0669174B1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
integral
counterblade
bending
hinged
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.)
Expired - Lifetime
Application number
EP95200333A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0669174A3 (it
EP0669174A2 (en
Inventor
Wolfgang Kunze
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.)
Salvagnini Italia SpA
Original Assignee
Salvagnini Italia SpA
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Filing date
Publication date
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Application filed by Salvagnini Italia SpA filed Critical Salvagnini Italia SpA
Publication of EP0669174A2 publication Critical patent/EP0669174A2/en
Publication of EP0669174A3 publication Critical patent/EP0669174A3/en
Application granted granted Critical
Publication of EP0669174B1 publication Critical patent/EP0669174B1/en
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/045—With a wiping movement of the bending blade

Definitions

  • the present invention relates to a machine for bending sheets of metal.
  • Machines for bending sheets of metal are known wherein the sheet of metal to be bent, arranged horizontally, is initially clamped between two casings, one lower known as “counterblade”, integral with the base of the machine and acting as support for the sheet of metal, and one upper, known as “sheet metal holder”, that can be moved vertically between an upper position for the introduction of the sheet of metal and a lower position for clamping and holding the sheet itself in position; the sheet of metal is positioned so that one edge thereof, destined to be bent, protrudes horizontally with respect to the edges of the counterblade and of the sheet metal holder, and the sheet metal holder is made to slide along vertical guides by hydraulic cylinders placed at its ends.
  • the sheet of metal is subsequently bent upward by a lower bending blade that is under the edge to be bent or downward by an upper bending blade that is above said edge, said upper and lower blades constituting a pair of bending blades integral with a common support that can move in an independent manner in the vertical and horizontal directions.
  • a lower bending blade that is under the edge to be bent or downward by an upper bending blade that is above said edge
  • said upper and lower blades constituting a pair of bending blades integral with a common support that can move in an independent manner in the vertical and horizontal directions.
  • US-A-3 662 584 discloses a sheet metal bending apparatus comprising a lower sheet metal holder which is movable in horizontal and downwards direction with respect to an upper sheet metal holder in order to enable a bending member to perform tight bends of said sheet metal, beyond 180°.
  • the object of the present invention is to provide a machine for bending sheets of metal wherein the sheet metal holder, as well as in a substantially vertical direction, can also be moved in a horizontal direction with respect to the base of the machine, and thus with respect to the counterblade.
  • the sheet metal holder can be moved both vertically and horizontally with respect to the counterblade. This determines a high degree of flexibility in the use of the machine, thanks to a much greater variety in the type of bends that it is capable of executing.
  • a bending machine comprises a base 1 to which, in the front, a counterblade 5 is integrally fastened that operates as a support for a metal sheet 6 to be bent; a sheet metal holder 40 is placed above the counterblade 5 and is integrally fastened to a support 4, that at the rear end of the machine is hinged at two points 11 to two respective cranks 3 integral with a torsion shaft or bar 2.
  • the torsion bar 2 is rotatably connected to the base 1 by means of two supports 41 integral with the base 1 and provided with through holes into which the ends of the torsion bar 2 are inserted.
  • a third crank 9 is fastened integrally to the torsion bar 2 in a median position, and is hinged to a stem 42 of a hydraulic cylinder 10 in turn hinged to a flange 60 integral with the base 1.
  • the support 4 of the sheet metal holder 40 is also hinged to a Linear succession of hydraulic cylinders 12 (only one shown in Fig. 1) whose stems are hinged to the base 1.
  • a pair of bending blades 7 and 8 and a unit for moving them are placed in the cavity between the base 1 and the support 4 of the sheet metal holder 40.
  • the pair of bending blades comprises an upper blade 7 and a lower blade 8, suitably shaped (Figs. 3, 3'-6, 6') fastened to a support 43 through which the stems of the cylinders 12 pass; such support 43 is hinged at the opposite end with respect to the blades 7 and 8 to a crank 44 integral with a shaft 45; a further crank 46, also integral with the shaft 45, is hinged to a stem 47 of a hydraulic cylinder 48 integrally fastened to the base 1.
  • the shaft 45 is rotatably connected to the base 1.
  • the support 43 for the pair of blades 7 and 8 is provided at its lower end with a flange 49 hinged to a stem of a further hydraulic cylinder 50, hinged to the base 1.
  • Fig. 2 is a simplified view, and in it, for greater clarity, neither the bending blades nor the corresponding moving unit are shown.
  • the hydraulic cylinders 12 determine the vertical movement of the sheet metal holder 40, that is, its upward and downward movement with respect to the counterblade 5; more specifically, the extension of the stems of the cylinders 12 determines the raising of the sheet metal holder 40, while their reversal determines the lowering of the sheet metal holder 40 over the sheet of metal 6, so that the latter is kept in position while it is being bent.
  • the trajectory described by the sheet metal holder 40 is in effect an arc of a circumference, since the support 4 rotates about a horizontal axis passing through the points 11 at which the support 4 itself is hinged on the cranks 3; but since the axis of rotation of the support 4 is rather distant from the sheet metal holder 40, the radius of such arc of a circumference is very large, and the trajectory of the sheet metal holder 40 is practically rectilinear vertical.
  • the hydraulic cylinder 10 determines the longitudinal horizontal movement of the support 4, and thus of the sheet metal holder 40: the extension or the reversal of its stem 42 in fact determines, through the crank 9, the rotation of the torsion bar 2, and thus the rotation of the two cranks 3; the latter, being hinged to the support 4, determine its substantially rectilinear horizontal motion.
  • the pair of bending blades 7 and 8 can move both in the longitudinal horizontal direction and in the vertical direction: the extension or the reversal of the stem 47 of the hydraulic cylinder 48 determines the rotation of the crank 46 and thus that of the shaft 45 and of the crank 44; the latter determines the forward or reverse movement of the support 43, and thus of the pair of blades 7 and 8.
  • the hydraulic cylinder 50 determines a motion of rotation of the support 43 about a horizontal axis of rotation passing through the hinge point with the crank 44, a motion that translates into a substantially vertical movement of the blades 7 and 8.
  • a first bend is executed up to the maximum angle ⁇ allowed by the non-interference of the edge 13 with the sheet metal holder 40, and then a second bend after moving the sheet metal holder 40 horizontally backward (by operating the cylinder 10), so that the latter limits the movement of the edge 13 to a lesser extent.
  • Figs. 4 and 4' two operational steps of the machine for the execution of a second type of bend.
  • the sheet 6 is made to move forward over the counterblade 5 so that, when the sheet metal holder 40 moves downward, an edge 14 protrudes beyond the line of bending, again defined by the edge of the counterblade 5.
  • the upward movement of the lower bending blade 8, following the operation of the cylinder 50, determines the progressive upward bending of the edge 14 until the latter forms a right angle with the sheet 6 itself.
  • the sheet metal holder 40 is raised and the sheet is made to move forward so that, when the sheet metal holder 40 moves downward again, an edge 14' protrudes with respect to the line of bending; the upward movement of the lower blade 8 determines a preliminary upward bend of the edge 14', until this is prevented by the interference between the edge 14 and the casing of the sheet metal holder 40 (Fig. 4); the sheet metal holder 40 is then made to move backward with respect to the line of bending, and the further upward movement of the blade 8 completes the bend of the edge 14', that ends when this forms a right angle with respect to the sheet 6 (Fig. 4').
  • the length of the edge 14 is limited by the distance between the line of bending and the casing of the sheet metal holder 40 (as shown by the dashed line in Fig. 4); but in the machine embodying the invention, if the edge 14 of the "C-shaped" bend is to have a greater length, it is sufficient to move the sheet metal holder 40 further back with respect to the line of bending after a first bending of the edge 14'.
  • Figs. 5 and 5' two operational steps for the execution of a 180° upward bend, not normally possible using traditional machines.
  • the sheet 6, possibly after having been subjected to other preliminary bending operations, is made to move forward over the counterblade 5 so that, after the downward movement of the sheet metal holder 40, an edge 15 protrudes with respect to the line of bending, again defined by the edge of the counterblade 5.
  • the lower blade 8 is then raised (by means of the cylinder 50) and subsequently made to move forward (by means of the cylinder 48) so as to bend the edge 15 up to the maximum possible angle (substantially equal to the angle ⁇ of Fig. 3).
  • the sheet metal holder 40 is aligned with the line of bending.
  • the sheet metal holder 40 is subsequently moved backward with respect to said line of bending by activating the cylinder 10, so that a part of the sheet of metal 6 is left uncovered.
  • the downward movement of the upper bending blade 7 is determined: this presses against the edge 15 of the sheet until the desired 180° bend is obtained.
  • Figs. 6 and 6' two operational steps suitable for obtaining a 180° downward bend are shown in Figs. 6 and 6' two operational steps suitable for obtaining a 180° downward bend, also not normally possible using traditional machines.
  • the sheet 6, possibly after having been subjected to prior bending operations is made to move forward with respect to the counterblade 5 so that, when the sheet metal holder 40 moves downward, an edge 16 protrudes with respect to the line of bending, that is, to the edge of the counterblade 5.
  • the cylinder 50 is then activated that determines the downward movement of the upper blade 7, and subsequently the cylinder 48 that determines the forward movement of the same to bend the edge 16 with respect to the sheet 6, as shown in Fig. 6; during this step the sheet metal holder 40 is aligned with the line of bending.
  • the sheet metal holder 40 is made to move forward with respect to said line (by means of the cylinder 10), so that it protrudes with respect to the counterblade 5; the sheet 6 is also made to move forward with respect to the counterblade 5.
  • the cylinder 50 When the cylinder 50 is activated the upward movement of the lower blade 8 is determined, that presses the edge 16 against the lower surface of the sheet metal holder 40 until the desired 180° bend is obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Laminated Bodies (AREA)
EP95200333A 1994-02-23 1995-02-11 Machine for bending sheets of metal Expired - Lifetime EP0669174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI940323 1994-02-23
ITMI940323A IT1273326B (it) 1994-02-23 1994-02-23 Macchina piegatrice per fogli di lamiera

Publications (3)

Publication Number Publication Date
EP0669174A2 EP0669174A2 (en) 1995-08-30
EP0669174A3 EP0669174A3 (it) 1995-10-11
EP0669174B1 true EP0669174B1 (en) 1999-06-02

Family

ID=11367947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95200333A Expired - Lifetime EP0669174B1 (en) 1994-02-23 1995-02-11 Machine for bending sheets of metal

Country Status (6)

Country Link
EP (1) EP0669174B1 (it)
AT (1) ATE180697T1 (it)
DE (1) DE69509936T2 (it)
DK (1) DK0669174T3 (it)
ES (1) ES2135653T3 (it)
IT (1) IT1273326B (it)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1312333B1 (it) * 1999-05-27 2002-04-15 Salvagnini Italia Spa Lama piegatrice e schiacciatrice per macchina per la piegatura e loschiacciamento di fogli di lamiera e macchina utilizzante la lama
IT1312343B1 (it) * 1999-06-03 2002-04-15 Salvagnini Italia Spa Macchina piegatrice per fogli di lamiera con bordi alti.
ES2209594B1 (es) * 2002-01-29 2005-06-01 Goiti, S. Coop. Maquina paneladora automatica.
CN102430618B (zh) * 2011-11-11 2014-03-26 中国建筑土木建设有限公司 铁皮矩形管折方装置及方法
ITUB20154609A1 (it) * 2015-09-22 2017-03-22 Tecnoma Automazioni Ind Srl Macchina multifunzione atta ad eseguire pieghe, curve aperte e chiuse in lamiera, sequenzialmente, in unica struttura.
CN111872190B (zh) * 2020-07-23 2021-07-13 南京云上自动化科技有限公司 一种高精、重载数控折边机
CN111804782B (zh) * 2020-07-23 2021-07-13 南京云上自动化科技有限公司 一种高速、高精数控折边机及折边梁位移求解方法
DE102022119618B3 (de) 2022-08-04 2023-12-28 Hans Schröder, Maschinenbau, Gesellschaft mit beschränkter Haftung Schwenkbiegemaschine zur Erzeugung eines Hohlumschlags an einem Blech und Blechbiegeverfahren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1090662A (en) * 1965-04-08 1967-11-15 Wilfred Ernest Gale Improvements in or relating to folding machines
US3359771A (en) * 1965-07-01 1967-12-26 Dreis & Krump Mfg Co Bench brake
US3662584A (en) * 1970-06-15 1972-05-16 Niagara Machine & Tool Works Sheet metal forming apparatus
IT1204674B (it) * 1987-06-03 1989-03-10 Salvagnini Transferica Spa Macchina piegatrice per fogli di lamiera con premilamiera a compressione uniforme
JPH0618667B2 (ja) * 1988-02-01 1994-03-16 丸機械工業株式会社 折曲げ機
JP3720959B2 (ja) * 1997-09-18 2005-11-30 株式会社東芝 二次電池用電極材料

Also Published As

Publication number Publication date
ITMI940323A1 (it) 1995-08-23
ES2135653T3 (es) 1999-11-01
EP0669174A3 (it) 1995-10-11
EP0669174A2 (en) 1995-08-30
DE69509936T2 (de) 1999-12-16
ITMI940323A0 (it) 1994-02-23
DK0669174T3 (da) 1999-11-29
DE69509936D1 (de) 1999-07-08
IT1273326B (it) 1997-07-08
ATE180697T1 (de) 1999-06-15

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