EP1961502A2 - Procédé et dispositif destinés au pliage de pièces - Google Patents

Procédé et dispositif destinés au pliage de pièces Download PDF

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Publication number
EP1961502A2
EP1961502A2 EP08405039A EP08405039A EP1961502A2 EP 1961502 A2 EP1961502 A2 EP 1961502A2 EP 08405039 A EP08405039 A EP 08405039A EP 08405039 A EP08405039 A EP 08405039A EP 1961502 A2 EP1961502 A2 EP 1961502A2
Authority
EP
European Patent Office
Prior art keywords
bending
workpiece
punch
angle
leg length
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
EP08405039A
Other languages
German (de)
English (en)
Other versions
EP1961502B1 (fr
EP1961502A3 (fr
Inventor
Gerrit Gerritsen
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.)
Bystronic Laser AG
Original Assignee
Bystronic Laser AG
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 Bystronic Laser AG filed Critical Bystronic Laser AG
Publication of EP1961502A2 publication Critical patent/EP1961502A2/fr
Publication of EP1961502A3 publication Critical patent/EP1961502A3/fr
Application granted granted Critical
Publication of EP1961502B1 publication Critical patent/EP1961502B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
    • 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
    • B21D5/006—Bending sheet metal along straight lines, e.g. to form simple curves combined with measuring of bends

Definitions

  • the present invention relates to a method for bending workpieces with a bending punch and a die having a bending device according to the preamble of claim 1 and a bending device for bending workpieces according to the preamble of claim 13.
  • the bending angle for known materials and known workpiece thickness by determining the penetration depth of the punch into the die can be determined theoretically accurate.
  • the bending punch moves more or less into the die during so-called air bending, depending on the desired bending angle.
  • so-called three-point bending the punch presses into the die until the punch or workpiece comes into contact with the more or less set die bottom.
  • a method of bending sheet metal by means of a bending device which has a bending punch and a die with an adjustable bottom.
  • the bending angle is determined by the relative position of the die bottom to the die opening certainly.
  • the angle of the loaded sheet during the bending operation is measured at at least one selected penetration depth and compared with the corresponding angle resulting from the comparison curve. Due to a possibly determined angular difference, the position of the die base is corrected in such a way that at the end of the bending process, the predetermined target angle can be maintained more accurately.
  • the leg length and / or the leg length change of the workpiece is determined and stored, and / or for different bending angle additionally the limb length and / or the leg length change of the workpiece is determined and from the detected and / or calculated values of the k-factor and possibly the inner bending radius for the workpiece calculated and stored, can be used in subsequent bending operations directly or indirectly to these values or These values are also taken into account for determining the immersion depth of the punch, so that ultimately the final bending angle can be maintained more accurately than before, even if individual workpiece parameters should change.
  • the final bending angle in subsequent bending operations, can be maintained very accurately even if neither the bending angle nor the leg length are measured during the bending process, but only several times the bending force and the associated immersion depth measured and compared with the stored reference values. Due to occurring deviations then ultimately for the final bending angle decisive maximum immersion depth of the punch can be set in the die.
  • gauges for measuring the bending angle and / or the leg length are undesirable because they are expensive, interfere with the handling, or even possibly protrude into the area of the workpiece to be bent, thereby limiting the bending capabilities.
  • the data determined during the reference bend and stored in a database can be transferred to other bending devices on which the subsequent bending operations are then carried out. In any case, the reference bend and the subsequent bending operations need not be performed on the same machine.
  • the position of the outer edge of the workpiece during the bending process is preferably detected several times.
  • a further object of the invention is to propose a bending device which is particularly suitable for detecting a plurality of parameters necessary for a precise bending angle on the basis of a reference bend.
  • the bending device 1 comprises a movable upper beam 2 and a fixed lower beam 3.
  • a bending punch 5 is fixed, while the immovable lower beam 3 carries a die 13.
  • the underside of the punch 5 is provided with a rounding 6.
  • the die has a V-shaped recess 14 with a fixed opening width and a top side designated 15, on which the workpiece to be bent comes to rest.
  • the upper beam 2 is movably supported on the actual machine frame 4, wherein the means necessary for moving the upper beam 2 are not shown.
  • an electronic control device 7 can be seen.
  • a displacement sensor 8 is provided, which is connected via an electrical connection line 9 to the control device 7.
  • the control device 7 is provided with an interface 12, via which data and can be read out.
  • at least one sensor 10 is arranged, by means of which the force exerted by the bending punch 5 on the workpiece to be bent force can be detected directly or indirectly.
  • a sensor 10 for example, a force transducer can be used by means of which directly acting on the upper beam 2 force can be measured.
  • two force transducers are provided.
  • a pressure transducer can be used, by means of which the prevailing during hydraulic displacement of the upper beam 2 hydraulic system pressure is detected, which is proportional to the upcoming bending force. Due to this pressure, in any case, the upcoming bending force can be determined.
  • strain gauges are mounted on the machine frame, preferably on a highly stressed point, as sensors, by means of which the bending force can then also be determined.
  • a measuring system 16 is arranged, by means of which the bending angle of a workpiece to be bent and the leg length or leg length change can be detected, as will be explained in more detail below.
  • a laser measuring device is used as measuring system 16, which emits a linear light beam 17 or laser beam, which is indicated by way of indication.
  • the measuring system 16 is also connected to the control device 7 via an electrical line 18. Possibly.
  • a measuring system 16 can also be provided on both sides of the lower cheek 3.
  • the measuring system is positioned such that the longitudinal axis 25 of the light beam 17 emitted by the measuring system encloses an angle ⁇ between 30 and 60 ° with the longitudinal axis 26 of the bending punch 5.
  • the Fig. 2 shows the bending device 1 in the starting position together with a workpiece to be bent 20.
  • the workpiece 20 is in the present example, a plate whose length, ie extension transverse to the intended bending edge is designated by X.
  • the workpiece 20 rests on the upper side of the die 13, the means provided for positioning and possibly fixing the workpiece 20 not are shown in more detail.
  • the measuring system 16 is positioned or set such that only part 17a of the light emitted by the measuring system 16 in the form of the laser line impinges on the workpiece 20, while a part 17c of this light passes laterally past the workpiece 20.
  • a small portion 17b of the emitted light impinges on the end face of the workpiece 20, which is not important for the following consideration.
  • the line of the laser beam projected onto the workpiece 20 by the measuring system 16 runs essentially transversely to the bending axis and forms a line with the length L1 on the workpiece 20.
  • the edges of the outer edge of the workpiece 20 are those edges which run parallel or possibly obliquely on both sides to the bending edge which arises during the bending process.
  • the measuring system 16 makes it possible to detect the bending angle of the workpiece 20 as well as the position of the outer edge 21 of the workpiece 20 facing the measuring system.
  • the measuring system 16 has a receiver device by means of which the laser line projected onto the workpiece 20 can be optically detected or detected and evaluated in such a way that the bending angle as well as the bending angle Position of an outer edge 21 of the workpiece 20 can be detected or calculated.
  • a receiver device may for example consist of a so-called CCD camera.
  • the length of the laser line projected onto the workpiece 20 can be detected with the receiver device, from which, together with the associated bending angle, a calculation of the absolute leg length and / or the relative leg length change is made possible.
  • the measuring system and the workpiece do not even have to be exactly positioned, but it merely has to be ensured that the laser line passes over the outer edge during the entire bending process 21 of the workpiece 20 and the range detected by the detection device also extends at least to the outer edge 21 of the workpiece 20.
  • the position of the edge 21 may also be detected with respect to a reference point defined relative to the receiver device.
  • the receiver device integrated in the measuring system is able to detect its absolute and / or relative position due to the light-dark transition in the region of the edge 21.
  • both the length of the detected line and also the leg length calculated together with the angle information and / or the leg length change can be stored.
  • the associated immersion depth of the punch 5, the associated bending force as well as the associated limb length and / or the limb length change are stored.
  • the leg length the length of the laser line projected onto the workpiece 20 or a leg may also be stored.
  • the parameters mentioned need not necessarily be stored in a directly usable unit, but only a value must be stored in each case, which allows a conclusion on the associated measured variable. In this regard, any variants are possible, which are not all enumerated here.
  • k-factor In addition to the directly recorded data, other variables such as the k-factor and internal bending radius can be calculated and possibly assigned to the bending angle.
  • a correction factor is referred to as the k-factor, which can be used to draw conclusions about the change in length caused by the bending process Workpiece 20 allows.
  • the neutral fiber of the workpiece 20 is moved to the inside, which is equivalent to an extension or extension of the workpiece 20 in the region of the bending line 22.
  • the k-factor and the bending inner radius are important because it important conclusions for the Bending of the same or similar materials but can be drawn with other tool combinations and / or other workpiece thicknesses.
  • the immersion depth of the punch 5 necessary for reaching a certain angle into the matrix 13 can also be determined very accurately if the properties of the workpiece vary or do not correspond exactly to the desired values.
  • the upper beam 2, as shown in Fig. 3 can be seen in a snapshot, moved down so that the punch 5 penetrates into the die 13 and the workpiece 20 bends along a bending line 22.
  • two legs 23, 24 are formed, which pivot upward as the bend increases.
  • the position of the respective leg 23 with respect to the measuring system 16 changes continuously.
  • the angle at which the laser light 17 strikes the leg 23 changes.
  • the length L2 of the line projected by means of the measuring system 16 on the underside of the leg 23 also changes.
  • the measurement of the bending angle is made by measuring the projection of the line laser on the leg 23 of the workpiece 20.
  • the position of the line with the camera is measured, which is directed obliquely to the surface of the workpiece 20. Due to the included angle between laser and camera axis, the bending angle can be calculated, as will be explained in more detail below.
  • the absolute length of the leg 23 and / or its change in length can be determined precisely on the basis of the measured length of the line and the associated bending angle. In principle, it does not matter whether the leg length or the leg length change of the workpiece 20 is determined or determined Since, in principle, both quantities are to be stored and used directly or indirectly as reference quantities or to be used for a subsequent bending process to determine the k-factor.
  • the bending angle is determined exclusively by the insertion depth of the punch 5 into the die 13.
  • immersion depth of the punch 5 in the die 13 the penetration of the front side of the punch 5 relative to the support surface 15 of the die 13 is referred to.
  • the bending force the force exerted on the workpiece 20 to be bent by the punch 5 is referred to in its entirety.
  • the punch 5 need not necessarily be arranged on the upper beam 2 and the die 13 on the lower beam 3, but that very well, a reverse arrangement is possible by the die 13 on the upper beam 2 and the punch on the Under cheek 3 of the bending device 1 are arranged. However, this does not change the fundamental idea of the invention and the method of operation.
  • the inside radius of the bend before the reference measurement is neither known nor can be calculated exactly, but this is crucial for the calculation of the exact immersion depth of the punch, the knowledge of the effective bending inner radius is of great importance.
  • the bending inner radius changes in particular depending on the opening width and the V-shape of the die, the punch radius, the sheet metal quality and the sheet thickness.
  • a bending process can be carried out in cycles, wherein during the bending process several times, for example every 10 °, the calculated angle is compared with the actually measured angle.
  • the workpiece is not relieved during the execution of the respective reference measurement, can be due to the measured Leg length or leg length change and the bending angle of the bending inner radius detached from the springback of the material can be determined.
  • the respective error in the calculation of the inner bending radius can be determined. From this, an "error curve" can be derived, which in each case has validity for the relevant sheet metal parameters such as type of sheet, thickness, etc. as well as a combination of upper and lower tool and can be used for subsequent bending.
  • the data obtained can be stored in the form of a table or "error curve" in such a way that these data can be used directly or indirectly in subsequent bending operations.
  • the bottom dead center-maximum insertion depth-of the punch can be determined very accurately, especially since the user only has to correct the actual sheet metal springback. The user can do without the mentioned measuring system for determining the leg length.
  • sheet metal springback can also be readily determined by stopping the bending operation, relieving the sheet by raising the punch, and measuring the angular change resulting from springback. It is understood that the sheet metal springback can also be measured several times per bending process.
  • the Fig. 4 shows a schematic representation of the actively detected by the CCD camera of the measuring system field 28.
  • the thick line 29 symbolizes the projected onto a leg of the workpiece laser line, while the dashed lines shown Line 30 represents the outside of the workpiece or the outer edge extending part of the laser line.
  • the range effectively detected by the camera is larger than the actively detected field 28.
  • the software is able to shift the active field 28 within the detection range of the camera so that the horizontal line 31 always coincides with the beginning of the laser beam 29 or the beginning of the laser beam 29 is located on the horizontal line 31.
  • the CCD camera together with the corresponding evaluation software is able to determine the angle ⁇ between the horizontal line 31 of the measuring field and the laser line 29 and to calculate therefrom the bending angle.
  • the angle ⁇ is thus a measure of the effective bending angle, wherein the angle detected by the camera does not have to match or coincide with the effective bending angle.
  • the effective leg length and / or the leg length change can also be calculated. While in the Fig. 4 the situation at a bending angle of 180 °, that is shown in the unbent initial state of the workpiece is in the Fig. 5 the situation is shown at a bending angle of 90 °. As can be seen, the angle ⁇ is smaller, while the length L2 of the laser line 29 projected onto the leg of the workpiece is greater. The length L1, L2 of the projected onto the leg of the workpiece laser line 29 can be accurately detected due to the respective light-dark transition, especially since a defined light-dark transition is formed by the outer edge of the workpiece. It is only important that the projected laser line projects laterally beyond the workpiece 20 during the entire bending process, ie over the outer edge 21 (FIG. Fig. 3 ) goes out.
  • the measured variables and data acquired or determined and / or calculated during the reference measurement are usually assigned to a specific material with a specific thickness and a specific tool combination. Ideally, therefore, for every material, every workpiece thickness and every Tool combination performed at least one reference measurement and stored the corresponding measurement data. Since this is hardly feasible in practice, however, reference data are normally used which come nearest to the material or tool combination to be bent and allow the best results to be expected with respect to the final bending angle.
  • the measured data and reference values stored in the database can be interpolated. For example, if there are entries for 2 mm and 3 mm thick workpieces from a particular material, the data for 2.5 mm can also be calculated. You can also interpolate up or down.
  • the data can also be calculated for a 5 mm thick workpiece.
  • the insertion depth of the punch into the die required for achieving a bending angle of 90 ° and 100 ° is known for a particular material, then the insertion depth necessary to achieve a bending angle of 93.2 °, for example, can also be calculated. Also between different die openings can be interpolated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP20080405039 2007-02-23 2008-02-14 Procédé et dispositif destinés au pliage de pièces Active EP1961502B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH3112007 2007-02-23

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EP1961502A2 true EP1961502A2 (fr) 2008-08-27
EP1961502A3 EP1961502A3 (fr) 2013-09-11
EP1961502B1 EP1961502B1 (fr) 2014-10-22

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PT (1) PT1961502E (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011000013A1 (fr) * 2009-06-29 2011-01-06 Trumpf Maschinen Austria Gmbh & Co. Kg. Procédé et dispositif de pliage d'une pièce
WO2011000011A1 (fr) * 2009-06-29 2011-01-06 Trumpf Maschinen Austria Gmbh & Co. Kg. Dispositif et procédé de pliage de pièce
AT508857B1 (de) * 2009-10-14 2011-07-15 Trumpf Maschinen Austria Gmbh Verfahren zur bestimmung der dicke eines werkstückes mit einer biegemaschine
DE102010009811A1 (de) 2010-03-02 2011-09-08 Mtu Aero Engines Gmbh Biegevorrichtung zum Biegen einer Schaufel eines Schaufelrings
US8683834B1 (en) * 2009-07-16 2014-04-01 Robert Macaulay Determining and exporting K-factors and bend allowance based on measured bend radius
US20150241208A1 (en) * 2012-10-12 2015-08-27 Nivora Ip B.V. Measurement System and Method for Measuring an Angle
WO2015196224A1 (fr) * 2014-06-23 2015-12-30 Trumpf Maschinen Austria Gmbh & Co. Kg. Dispositif de mesure d'angles de pliage destiné à une presse de pliage
US9527122B2 (en) 2009-06-29 2016-12-27 Trumpf Maschinen Austria Gmbh & Co. Kg. Device and method for the laser-supported bending of workpieces
CN108941261A (zh) * 2018-06-06 2018-12-07 繁昌县倍思生产力促进中心有限公司 一种钢板压弯装置
CN109500156A (zh) * 2018-12-28 2019-03-22 天津航天长征火箭制造有限公司 一种高筋厚比内网格壁板弯曲成型装置及方法
AT520563B1 (de) * 2017-12-22 2019-05-15 Trumpf Maschinen Austria Gmbh & Co Kg Bestimmung der Biegeverkürzung eines zu biegenden Blechwerkstückes
CN112536344A (zh) * 2020-11-03 2021-03-23 南京凡多智能科技有限公司 板材折弯角度控制系统
AT523360A1 (de) * 2019-12-19 2021-07-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegemaschine und Kontrolleinrichtung
CN114309149A (zh) * 2022-01-05 2022-04-12 河北省送变电有限公司 一种输电铁塔板材制弯角度实时感应装置及角度感应方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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CN104942045A (zh) * 2015-06-24 2015-09-30 苏州边桐传感科技有限公司 基于压力感应控制的折弯加工装置
CN104942076A (zh) * 2015-06-25 2015-09-30 苏州边桐传感科技有限公司 带角度调控与阶段折弯的钣金折弯系统及方法

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EP0341211A2 (fr) 1988-05-03 1989-11-08 Haemmerle Ag Procédé de pliage de tôle
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DE3216053A1 (de) * 1982-04-29 1983-11-03 Karl Mengele & Söhne Maschinenfabrik und Eisengießerei GmbH & Co, 8870 Günzburg Optoelektronisches messverfahren und vorrichtung zur durchfuehrung des verfahrens
JPH07119586B2 (ja) * 1986-07-16 1995-12-20 株式会社アムテツク 折曲げ加工機用ワーク傾斜角度測定装置
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Publication number Priority date Publication date Assignee Title
EP0341211A2 (fr) 1988-05-03 1989-11-08 Haemmerle Ag Procédé de pliage de tôle
DE102005012384A1 (de) 2005-03-17 2006-07-13 Siemens Ag Verfahren zum Freibiegen

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011000011A1 (fr) * 2009-06-29 2011-01-06 Trumpf Maschinen Austria Gmbh & Co. Kg. Dispositif et procédé de pliage de pièce
US9527122B2 (en) 2009-06-29 2016-12-27 Trumpf Maschinen Austria Gmbh & Co. Kg. Device and method for the laser-supported bending of workpieces
WO2011000013A1 (fr) * 2009-06-29 2011-01-06 Trumpf Maschinen Austria Gmbh & Co. Kg. Procédé et dispositif de pliage d'une pièce
US9003847B2 (en) 2009-06-29 2015-04-14 Trumpf Maschinen Austria Gmbh & Co. Kg. Device and method for bending a workpiece
US9003848B2 (en) 2009-06-29 2015-04-14 Trumpf Maschinen Austria Gmbh & Co., Kg. Device and method for bending a workpiece
US9108237B1 (en) * 2009-07-16 2015-08-18 Robert Macaulay Determining, calibrating, and exporting K-factors and bend allowance
US8683834B1 (en) * 2009-07-16 2014-04-01 Robert Macaulay Determining and exporting K-factors and bend allowance based on measured bend radius
AT508857B1 (de) * 2009-10-14 2011-07-15 Trumpf Maschinen Austria Gmbh Verfahren zur bestimmung der dicke eines werkstückes mit einer biegemaschine
DE102010009811A1 (de) 2010-03-02 2011-09-08 Mtu Aero Engines Gmbh Biegevorrichtung zum Biegen einer Schaufel eines Schaufelrings
DE102010009811B4 (de) * 2010-03-02 2013-05-16 Mtu Aero Engines Gmbh Biegevorrichtung zum Biegen einer Schaufel eines Schaufelrings
US20150241208A1 (en) * 2012-10-12 2015-08-27 Nivora Ip B.V. Measurement System and Method for Measuring an Angle
US10302425B2 (en) * 2012-10-12 2019-05-28 Nivora Ip B.V. Measurement system and method for measuring an angle
US11156454B2 (en) 2012-10-12 2021-10-26 Nivora Ip B.V. Measurement system and machine for folding an object
WO2015196224A1 (fr) * 2014-06-23 2015-12-30 Trumpf Maschinen Austria Gmbh & Co. Kg. Dispositif de mesure d'angles de pliage destiné à une presse de pliage
AT520563B1 (de) * 2017-12-22 2019-05-15 Trumpf Maschinen Austria Gmbh & Co Kg Bestimmung der Biegeverkürzung eines zu biegenden Blechwerkstückes
AT520563A4 (de) * 2017-12-22 2019-05-15 Trumpf Maschinen Austria Gmbh & Co Kg Bestimmung der Biegeverkürzung eines zu biegenden Blechwerkstückes
CN108941261A (zh) * 2018-06-06 2018-12-07 繁昌县倍思生产力促进中心有限公司 一种钢板压弯装置
CN109500156A (zh) * 2018-12-28 2019-03-22 天津航天长征火箭制造有限公司 一种高筋厚比内网格壁板弯曲成型装置及方法
AT523360A1 (de) * 2019-12-19 2021-07-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegemaschine und Kontrolleinrichtung
AT523360B1 (de) * 2019-12-19 2022-05-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegemaschine und Kontrolleinrichtung
CN112536344A (zh) * 2020-11-03 2021-03-23 南京凡多智能科技有限公司 板材折弯角度控制系统
CN114309149A (zh) * 2022-01-05 2022-04-12 河北省送变电有限公司 一种输电铁塔板材制弯角度实时感应装置及角度感应方法
CN114309149B (zh) * 2022-01-05 2024-02-02 河北省送变电有限公司 一种输电铁塔板材制弯角度实时感应装置及角度感应方法

Also Published As

Publication number Publication date
PT1961502E (pt) 2014-11-06
EP1961502B1 (fr) 2014-10-22
EP1961502A3 (fr) 2013-09-11

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