EP1224985A1 - Machine à cintrer, notamment pour le cintrage de tôles en acier - Google Patents

Machine à cintrer, notamment pour le cintrage de tôles en acier Download PDF

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Publication number
EP1224985A1
EP1224985A1 EP01830029A EP01830029A EP1224985A1 EP 1224985 A1 EP1224985 A1 EP 1224985A1 EP 01830029 A EP01830029 A EP 01830029A EP 01830029 A EP01830029 A EP 01830029A EP 1224985 A1 EP1224985 A1 EP 1224985A1
Authority
EP
European Patent Office
Prior art keywords
punch
bending
workpiece
machine
axis
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.)
Granted
Application number
EP01830029A
Other languages
German (de)
English (en)
Other versions
EP1224985B1 (fr
Inventor
Davide Pelloni
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.)
Siderpress SpA
Original Assignee
Siderpress SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siderpress SpA filed Critical Siderpress SpA
Priority to AT01830029T priority Critical patent/ATE330728T1/de
Priority to EP01830029A priority patent/EP1224985B1/fr
Priority to DE60120895T priority patent/DE60120895T2/de
Publication of EP1224985A1 publication Critical patent/EP1224985A1/fr
Application granted granted Critical
Publication of EP1224985B1 publication Critical patent/EP1224985B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B21D5/0263—Die with two oscillating halves

Definitions

  • the invention is usefully applied for varying the longitudinal axis of a workpiece, for example sheet steel, by plastic deformation, to a predetermined angle and with the resultant fold having a relatively small curvature.
  • the invention relates to a bending machine as described in the preamble to the first claim.
  • a machine of this type already exists in the prior art, which plastically deforms the sheet steel to a dihedral axis and with a relatively small curvature in the angle in relation to the steel thickness.
  • the bottom die is usually in the shape of a V-cavity, and the sheet of steel is placed on the edges of the die before the punch is brought into action, thrusting into the centre of the sheet until the latter adheres perfectly to the walls of the bottom die.
  • the main aim of the present invention is to provide a machine which can overcome the above-described prior-art drawbacks and limitations.
  • An advantage of the invention is that it is constructionally simple and economical.
  • a further advantage is that the invention provides a machine which has a relatively low energy consumption.
  • a further advantage is that friction on the steel is reduced during the bending operation.
  • 1 denotes the punch of a bending machine for plastically deforming metal objects, in particular sheet steel, by means of bending against a bottom die.
  • the punch 1 is operatively associated with a press, of known type and not illustrated, exerting a pressing action in the direction of a vertical axis x-x.
  • the punch 1 exhibits a lower end 2, destined to contact the workpiece object to be bent; the punch lower end 2 has a rounded striker with an angle of curvature which roughly corresponds to the desired angle of curvature in the object after bending.
  • the bending machine comprises a bottom die 3, which identifies at least one dihedral bending angle, against which the punch 1 presses a workpiece 4.
  • the bottom die 3 is suitable for bending the workpiece 4 at the bottom end of the die 3, where the workpiece is pressed against the wall at the bottom of the die 3 and thus takes on the dihedral bending angle of the wall itself.
  • the die 3 comprises idle means for interacting on contact with the workpiece 4 during the punch 1 pressing action.
  • the idle means comprise four idle wheels 5, rotatably mounted on two opposite-facing skates 6, themselves rotatable about pivots 7 with parallel oscillation axes.
  • the skates 6, which are rotatably coupled to a fixed frame 8, are situated on opposite sides of the axis x-x of the punch 1, and are symmetrically arranged with respect to a vertical plane passing through the axis x-x and parallel to the oscillation axes of the skates 6.
  • Each skate 6 bears, on opposite sides with respect to the axis of oscillation thereof, two idle wheels 5.
  • the axis of rotation of each wheel 5 is parallel to the axes of oscillation of the skates 6.
  • the wheels 5 project from the skates 6 which support the wheels 5, so that the workpiece 4 can run on the wheels 5 during the bending stage.
  • the bottom die 3 exhibits a mobile bottom wall, with variable and adjustable geometry.
  • the bottom wall is described by the idle wheels 5 of the skates 6, and can assume at least two positions.
  • the first of these positions (see figure 1) is a starting position in which the idle wheels 5 together form a rest plane, preferably horizontal and perpendicular to the axis x-x in which the punch operates.
  • the workpiece 4 is positioned against the rest plane when in this position.
  • the idle wheels 5 describe a dihedral angle into which the workpiece 4 has been pressed and plastically deformed.
  • each skate 6 interacts contactingly with a stop 9 solidly fixed to the frame 8.
  • the punch 1 is commanded by the press to descend towards the object 4 positioned on the bottom die 3, which latter is in the horizontal first position.
  • the bending action begins, during which the lower side of the workpiece 4 interacts contactingly with the idle wheels 5 of the die 3. Thanks to the sliding rest afforded by the wheels 5, the parts of the object 4 in contact with the die 3, during the bending process, run against the die 3 with no dragging, and with very low friction.
  • the friction generated is almost exclusively of the revolving type, with a practically total elimination of dragging friction.
  • the machine is especially usable for bending sheet steel, but is advantageously applicable also in bending other plastically-deformable objects, of various shapes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP01830029A 2001-01-19 2001-01-19 Machine à cintrer, notamment pour le cintrage de tôles en acier Expired - Lifetime EP1224985B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT01830029T ATE330728T1 (de) 2001-01-19 2001-01-19 Biegemaschine, insbesondere zum biegen von stahlblechen
EP01830029A EP1224985B1 (fr) 2001-01-19 2001-01-19 Machine à cintrer, notamment pour le cintrage de tôles en acier
DE60120895T DE60120895T2 (de) 2001-01-19 2001-01-19 Biegemaschine, insbesondere zum Biegen von Stahlblechen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01830029A EP1224985B1 (fr) 2001-01-19 2001-01-19 Machine à cintrer, notamment pour le cintrage de tôles en acier

Publications (2)

Publication Number Publication Date
EP1224985A1 true EP1224985A1 (fr) 2002-07-24
EP1224985B1 EP1224985B1 (fr) 2006-06-21

Family

ID=8184362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01830029A Expired - Lifetime EP1224985B1 (fr) 2001-01-19 2001-01-19 Machine à cintrer, notamment pour le cintrage de tôles en acier

Country Status (3)

Country Link
EP (1) EP1224985B1 (fr)
AT (1) ATE330728T1 (fr)
DE (1) DE60120895T2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2581145A1 (fr) * 2011-10-10 2013-04-17 Invacare Corporation Ensemble de pliage poinçon et matrice
CN107073860A (zh) * 2014-08-28 2017-08-18 戴维·布罗德赫德 用于冲压模具的冲模或冲头
CN107138567A (zh) * 2017-07-18 2017-09-08 芜湖乾凯材料科技有限公司 一种高效数控折弯机
CN108453157A (zh) * 2018-01-15 2018-08-28 江阴协圣精密科技有限公司 一种折弯模具及包含其的自动化折弯设备
CN111842572A (zh) * 2020-08-03 2020-10-30 西安信康实业有限公司 一种变压器油箱制作用型材弯曲机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209576A (en) * 1961-02-03 1965-10-05 Promecan Sisson Lehmann Die arrangement for a press
JPS5910419A (ja) * 1982-07-09 1984-01-19 Kawasaki Steel Corp Ｕプレスパンチ取付装置
DE4316774A1 (de) * 1993-05-19 1994-11-24 Arno Werkle Vorrichtung zum Biegen von Blech

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209576A (en) * 1961-02-03 1965-10-05 Promecan Sisson Lehmann Die arrangement for a press
JPS5910419A (ja) * 1982-07-09 1984-01-19 Kawasaki Steel Corp Ｕプレスパンチ取付装置
DE4316774A1 (de) * 1993-05-19 1994-11-24 Arno Werkle Vorrichtung zum Biegen von Blech

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 096 (M - 294) 4 May 1984 (1984-05-04) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2581145A1 (fr) * 2011-10-10 2013-04-17 Invacare Corporation Ensemble de pliage poinçon et matrice
CN107073860A (zh) * 2014-08-28 2017-08-18 戴维·布罗德赫德 用于冲压模具的冲模或冲头
CN107138567A (zh) * 2017-07-18 2017-09-08 芜湖乾凯材料科技有限公司 一种高效数控折弯机
CN108453157A (zh) * 2018-01-15 2018-08-28 江阴协圣精密科技有限公司 一种折弯模具及包含其的自动化折弯设备
CN111842572A (zh) * 2020-08-03 2020-10-30 西安信康实业有限公司 一种变压器油箱制作用型材弯曲机

Also Published As

Publication number Publication date
EP1224985B1 (fr) 2006-06-21
ATE330728T1 (de) 2006-07-15
DE60120895T2 (de) 2007-01-18
DE60120895D1 (de) 2006-08-03

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