EP1052034A2 - Blechbiegemaschine, Steuerung und Verfahren - Google Patents

Blechbiegemaschine, Steuerung und Verfahren Download PDF

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Publication number
EP1052034A2
EP1052034A2 EP00106272A EP00106272A EP1052034A2 EP 1052034 A2 EP1052034 A2 EP 1052034A2 EP 00106272 A EP00106272 A EP 00106272A EP 00106272 A EP00106272 A EP 00106272A EP 1052034 A2 EP1052034 A2 EP 1052034A2
Authority
EP
European Patent Office
Prior art keywords
fold
sheet
folder
bar
fold bar
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.)
Withdrawn
Application number
EP00106272A
Other languages
English (en)
French (fr)
Other versions
EP1052034A3 (de
Inventor
Peter Alexander Grogan
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.)
Fisher and Paykel Appliances Ltd
Original Assignee
Fisher and Paykel Appliances Ltd
Fisher and Paykel Ltd
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 Fisher and Paykel Appliances Ltd, Fisher and Paykel Ltd filed Critical Fisher and Paykel Appliances Ltd
Publication of EP1052034A2 publication Critical patent/EP1052034A2/de
Publication of EP1052034A3 publication Critical patent/EP1052034A3/de
Withdrawn legal-status Critical Current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
    • B21D5/04—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
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • This invention relates to sheet metal folders, and in particular to improved control system for controlling movement of the fold bar of a sheet metal tangent folder or bender to ensure an accurate bend angle.
  • a tangent folder is employed.
  • a moving fold bar has a surface which faces the centre of curvature of the fold being formed, and rotates about said centre of curvature, remaining tangential to that centre throughout a folding operation. This surface bears against the sheet and forms a bend in the sheet in accordance with curve followed by the fold bar. The final curve formed in the sheet is strongly dependent on the springback in the metal being formed.
  • the invention consists in a sheet metal folder including a movable fold bar, actuation means to move said moveable fold bar, sheet position monitoring means which monitor the position of the folded portion of a sheet, and control means which are adapted to perform, during folding, the steps of:
  • control system for an existing tangent folder comprising:
  • the invention consists in a method of operating a tangent folder comprising the steps of:
  • the present invention is applicable to a wide range of existing sheet metal folder types, including tangential folders such as that depicted in Figure 10. Tangential folders are particularly useful in applications involving a precoated metal sheet and for forming large radius bends.
  • the present invention may require modification of conventional folders to incorporate a controlled drive having a variable final position, for example by providing actuation through one of the many types of available linear actuators.
  • the actuator be the type capable of providing positional information to its controller.
  • a linear actuator such as a Parker ET Series electric cylinder or similar is appropriate.
  • a sensor capable of detecting when the metal sheet no longer contacts the fold face of the fold bar is required. This sensor may comprise a light sensor, or alternatively a capacitor sensor of known type.
  • a tangential folder of a conventional form including a moving fold bar 102, a clamp 103 and a fixed fold bar 104.
  • the fixed fold bar 104 and clamp 103 may be easily interchanged as regards which of the two components moves relative to the other in grasping and holding of a sheet.
  • the lower member 103 moves to clamp against the upper member 104 to retain the sheet, the lower member 103 being supported by a linear moving carrying arrangement 105 guided by a track 106 and actuated by an actuator 107.
  • the upper clamping member 104 is supported on a beam 108.
  • the moving fold bar 102 is carried by a carriage 109 supported at each end by a substantially circular hub 110 (with a large section removed to allow sheet ingress and egress with the fold bar carriage 109 in a start/finish position) which rotates within a complementary circular bush 111. Movement of the fold bar carriage 109 is actuated by actuator 112.
  • actuator 112. The particulars of arrangements form no part of the present invention.
  • a tangential folder of conventional type is shown with a moving fold bar 2, a clamp 3 in a fixed fold bar 4.
  • the tangential folder has been modified to include a sensor or microswitch 5 in the moving fold bar 2.
  • a sheet 1 is shown clamped between to clamp 3 and the fixed fold bar 4.
  • a controller controlling the movement of the folder makes an initial fold to a first fold position, detects the amount of spring back and calculates a second fold position based on the detected spring back which may provide a correct final relaxed position for the sheet. It then performs a second fold to this second fold position and, preferably once more checks the amount of spring back and ensures that the final relaxed position of the sheet is within a tolerable limit to that required. At least in the first sheet of each batch the folder selects an initial fold position which is guaranteed to be a lesser angle than that required to ensure that no over bend occurs (which would be irreversible) Subsequent sheets in the batch can be processed based on the second fold position from the first sheet as their first fold position and can usually be folded in a single folding operation.
  • the folder control system preferably re runs the calibration steps as required.
  • FIGS 1 to 8 they show a folding sequence of a tangential folder controlled according to the present invention.
  • the sequence shows a folding operation as it may be performed on the first sheet of a batch.
  • the sheet 1 is clamped between a clamp 3 and the stationary fold bar 4 as shown in Figure 1.
  • the fold bar 2 is actuated to a first fold position as indicated by the position in Figure 2. Being a tangential folder this movement is made in the manner indicated by the locus 6, arrow 8 and centre 7.
  • This first position is set to ensure that for any material that is intended to be handled by the folder spring back of the sheet will leave the sheet short of the intended final position (see Figure 4).
  • the control system may be configured to set this first position as being the final intended position for the sheet, so that no risk of over folding or over bending is possible.
  • the moving fold bar is caused to retreat from its first position in the direction indicated by arrow 9 and the sheet 1, in spring back mode, follows, remaining in contact with the folding face 10 of the folding bar 2 until it reaches it's relaxed position.
  • the sheet in the relaxed position as depicted in Figure 4, with the fold bar 2 still retreating as indicated by arrow 9 the face 10 comes out of contact with the sheet 1 and this condition is detected by the sensor or microswitch 5.
  • the control system requests positional information from the linear actuator controlling the position of the fold bar 2. This positional information provides an indication of the overall spring back angle for the initial fold.
  • the control system calculates a second fold position for the fold bar 2 for a second fold operation, which it is expected will leave the sheet 1 in the desired final position (within tolerance) in a relaxed mode after spring back.
  • the fold bar 2 is then actuated to this second position as indicated by arrow 11 in Figure 5.
  • the fold bar 2 is subsequently retreated from the second position as indicated by arrow 12 in Figure 6 with spring back of the sheet material retaining the material in contact with the face 10 of the fold bar 2 until it reaches its relaxed position (approximately the position shown in Figure 6).
  • the motion is continued in the direction of arrow 12 until the sensor or microswitch 5 detects that the sheet 1 is no longer in contact with the face 10 of the fold bar 2.
  • the controller requests positional information from the linear actuator and from this calculates the final reined position of the folded sheet 1. Assuming that this position is in the required tolerances the fold bar 2 is retreated completely to its initial position as indicated by arrow 13 in Figure 8.
  • subsequent sheets of the same batch may be folded based on a calculated first position which brings the sheet 1 much closer to the final reined position that it intended.
  • this first position for subsequent sheets will be equivalent to the second position used on the initial sheet of a batch.
  • the first fold must guarantee an underfold for all materials. Therefore the maximum first fold position (x 1 ) will be the fold that could possibly give final fold position (N). At completion of the fold and retreat of the fold bar, the final position (y 1 ) and the spring back angle (z 1 ) are determined.
  • the first springback value (z 1 ) is stored in memory to be referred to in the next folding operation. If the value of z 1 is considerably deviant from the previous fold operation, this indicates that a change in material may have occurred. This information may need to be considered in the second fold position calculation i.e recalculate a new p value on the assumption no history is available (see below).
  • the amount of overbond required on the second fold will be related to the amount of springback measured from the first fold.
  • the invention provides a folder which gives accurate folding based on a multiple step process of calibration and can therefore cope with differing materials and differing batches. This is particularly important in modem manufacturing processes where a folder may be folding sheet for use in a variety of products, although, often nominally of the same gauge, will frequently be sourced from different batches (for reasons such as colour, surface finish etc). It has been found that the invention provides excellent accuracy for such folding particularly in folding where large cower radiuses are required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
EP00106272A 1999-03-22 2000-03-22 Blechbiegemaschine, Steuerung und Verfahren Withdrawn EP1052034A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ33479099 1999-03-22
NZ33479099 1999-03-22

Publications (2)

Publication Number Publication Date
EP1052034A2 true EP1052034A2 (de) 2000-11-15
EP1052034A3 EP1052034A3 (de) 2001-10-31

Family

ID=19927187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00106272A Withdrawn EP1052034A3 (de) 1999-03-22 2000-03-22 Blechbiegemaschine, Steuerung und Verfahren

Country Status (2)

Country Link
EP (1) EP1052034A3 (de)
NZ (1) NZ503297A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1410855A1 (de) * 2002-10-11 2004-04-21 CODATTO Antonio Verfahren und Vorrichtung zum Biegen von Elementen, so wie Platten oder Bleche
ES2209594A1 (es) * 2002-01-29 2004-06-16 Goiti, S. Coop. Maquina paneladora automatica.
CN108188285A (zh) * 2018-02-06 2018-06-22 孙慧琴 一种骨科临床手术钢板预弯装置
CN115519009A (zh) * 2022-09-07 2022-12-27 青岛海尔模具有限公司 折弯模具及折弯成型方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2704399A1 (de) * 1977-02-03 1978-08-10 Fastenrath Fasti Werk Vorrichtung zur biegewinkeleinstellung an schwenk-biegemaschinen
DE3739173A1 (de) * 1987-11-19 1989-06-01 Feintool Int Holding Verfahren und vorrichtung zum biegen von werkstuecken
JP2637023B2 (ja) * 1992-11-18 1997-08-06 ニチコン株式会社 金属化フィルムコンデンサ

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2209594A1 (es) * 2002-01-29 2004-06-16 Goiti, S. Coop. Maquina paneladora automatica.
ES2209594B1 (es) * 2002-01-29 2005-06-01 Goiti, S. Coop. Maquina paneladora automatica.
EP1410855A1 (de) * 2002-10-11 2004-04-21 CODATTO Antonio Verfahren und Vorrichtung zum Biegen von Elementen, so wie Platten oder Bleche
US7055355B2 (en) 2002-10-11 2006-06-06 Antonio Codatto Method and device for bending elements, such as panels, metal sheet, plates or suchlike
CN108188285A (zh) * 2018-02-06 2018-06-22 孙慧琴 一种骨科临床手术钢板预弯装置
CN115519009A (zh) * 2022-09-07 2022-12-27 青岛海尔模具有限公司 折弯模具及折弯成型方法

Also Published As

Publication number Publication date
NZ503297A (en) 2000-10-27
EP1052034A3 (de) 2001-10-31

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