US20070186602A1 - Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press - Google Patents

Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press Download PDF

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Publication number
US20070186602A1
US20070186602A1 US10/588,904 US58890405A US2007186602A1 US 20070186602 A1 US20070186602 A1 US 20070186602A1 US 58890405 A US58890405 A US 58890405A US 2007186602 A1 US2007186602 A1 US 2007186602A1
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US
United States
Prior art keywords
orifices
bending
pressure
matrix die
compressed air
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.)
Abandoned
Application number
US10/588,904
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English (en)
Inventor
Giovanni Cella
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.)
TASK 84 SpA
Original Assignee
TASK 84 SpA
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Filing date
Publication date
Application filed by TASK 84 SpA filed Critical TASK 84 SpA
Assigned to TASK 84 S.P.A. reassignment TASK 84 S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CELLA, GIOVANNI
Publication of US20070186602A1 publication Critical patent/US20070186602A1/en
Abandoned 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
    • B21D5/0209—Tools therefor
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B13/00—Measuring arrangements characterised by the use of fluids
    • G01B13/18—Measuring arrangements characterised by the use of fluids for measuring angles or tapers; for testing the alignment of axes

Definitions

  • the present invention deals with a process and a pneumatic device for detecting the bending angle of a plate sheet in a bending press.
  • bending presses can have different construction variations.
  • the most widespread ones are composed of a moving table supporting a punch and a fixed table supporting a matrix die.
  • the moving table can translate in a vertical plane along two risers on which two hydraulic cylinders are assembled for this movements.
  • Matrix die and punch have different shapes depending on the bending angle that has to be obtained, and therefore are both or only one of them interchangeable, provided that they are compatible.
  • the plate sheet is rested onto the matrix die and the punch drops over it.
  • One of the major problems of bending presses is verifying, at the end of the bending step, the bending angle and in particular whether such angle coincides with the desired angle.
  • the elastic plate return can be determined with difficulty, since it depends on three major variable factors:
  • the fork heads or bits are adapted to be arranged in contact with the sheet plate.
  • the two elastically yielding forks are connected on their lower side to a related position transducer that communicates with a logical data processing unit that manages the bending press.
  • Another system for detecting the bending angle is the one manufactured by the Belgian Company LVD that provides for a moving arm, placed beside the matrix die, which, supported by two linkages, and during the bending stage, arranges sensor means in contact with one of the two wings of the diverging plate.
  • the sensor means are coaxially moving with respect to such arm and provide detection data to the bending press logical unit.
  • the fork movement can be constrained by the presence of dirt or metallic debris that can always be found in environments where metals are worked.
  • the optical system provides for at least one source of a light beam that is used for projecting two spots or a linear segment onto part of the sheet to be controlled.
  • the bending angle is given by the distance between the projected spots, the known beam incidence angles, and the known distance between detection planes.
  • the passing channels of the two light beams create a punch weakening; moreover, such channels can be easily occluded by debris or impurities that can be found on the plates thereby impairing their reading or making it unreliable.
  • EP 1083403 It also known from patent EP 1083403 a method and device for detecting the bending angle of a plate.
  • EP 1083403 shows a bending die having orifices in the face and slot side. In order to detect the bending angle, the pressure difference in an orifice is measured. With the help of tables, formulas, etc the value of the pressure difference is transferred in a value of an angle.
  • Object of the present invention is ensuring the bending angle determination with a system that is able to avoid any occlusion or reading obstacle.
  • FIG. 1 schematically shows the present device applied to a matrix die of a bending press before starting the bending step
  • FIG. 2 shows the device in FIG. 1 in an intermediate bending step
  • FIG. 3 shows the device in FIG. 1 in a final bending step
  • FIG. 4 shows, in a block diagram form, a preferred embodiment of the measuring system with auxiliary devices that increase its accuracy.
  • reference 1 designates a matrix of a bending press in a cross section
  • reference 10 designates the matrix die slot.
  • the punch 2 is provided over the matrix die, while reference 3 designates a plate sheet that has to be bent along a desired line and that must reach a certain bending angle.
  • Each pair comprises a first orifice 5 and a second orifice 6 , which are supplied through respective channels 7 and 8 obtained in the matrix die body, through a compressed air system.
  • the compressed air system whose line 9 is shown, provides for a precision pressure reducer RP that always keeps the pressure constant at a pre-set value, with a symmetrical and balanced piping system, adapted to sent the same air flow rate to the four orifices when they are completely open.
  • a pressure detector is inserted, which transmits its own signal to a signal transducer which is able to communicate with a data processing unit that is able to process the position assumed by the plate, and therefore the plate bending angle, every time during its bending and particularly till the punch ceases its action and goes away from the matrix die, while the plate elastically returns to its final bending angle.
  • the orifices location is preferably the shown one and more precisely the first orifice 5 , called external orifice, is vertically arranged along a perpendicular direction to the plate sheet before its bending and is substantially on the plane matrix die surface next to the slot.
  • the second orifice 6 is arranged perpendicularly to the slot face and exits onto this face at a certain distance from the first orifice.
  • the two orifices therefore are on two surfaces that get in contact with the plate at different times when the plate is bent with its maximum possible angle.
  • the plate sheet As shown in FIG. 1 , the plate sheet, at the beginning of the pressing cycle, completely clogs the orifice 5 and the detected pressure will be maximum, while the orifice 6 will be completely free with a minimum pressure, since air will be able to freely go out to the outside environment.
  • the orifice 5 When starting the pressing step, see FIG. 2 , the orifice 5 will start to be freed while the orifice 6 will start to close due to the plate bending.
  • the pressure detectors are not of the absolute type, but of the differential type, and detect the pressure difference that occurs in the duct going to the internal orifices with respect to the ducts going to the external orifices.
  • the plate bending angle measure must take into account both angles against which the plate rests on the two matrix die edges.
  • two separate differential pressure transducers can be used, one for each matrix die edge, and their signals can be processed in a combined way.
  • the same ducts that mutually connect the external orifices and that mutually connect the internal orifices inside the matrix die pneumatically realise the mean of measures of the two angles, based on symmetry, and therefore a single differential pressure sensor is used.
  • the angle measure can be obtained by measuring the detected pressure difference, through a calibration table that compensates for the unavoidable system lack of linearity, and takes into account the dependence on the supply air pressure.
  • a compensating device 12 is added, composed of a pair of symmetrical orifices 13 with a shutter 14 connected to a servo-positioning device 15 adapted to progressively change the air passage section of the two orifices along opposite directions, in a way that is quite similar to what occurs on the matrix die edge when bending the plate.
  • the servo-positioning device is controlled by the pressure difference detected by the differential pressure sensor TDP, it moves since it is taken to zero, since the air passage section difference in matrix die orifices is perfectly compensated by the section difference of compensating device orifices.
  • the plate angle is bi-univocally related to the position reached by the shutter, which can be very accurately detected through various systems known per se.
  • the position is detected with an absolute encoder, not shown in the figures, and connected to the numeric press control.
  • the numeric control After an initial calibration, for example performed with calibrated dihedral angles placed on the matrix die, the numeric control builds a table from which it obtains, at any time, the plate bending angle, starting from the shutter position, or vice versa.
  • the residual error due to differential sensor zero drift can be detected and compensated by the system upon every bending cycle, by simply shutting off the common compressed air supply and by taking into account the residual value provided by the sensor.
  • the immediate measure of angle variations can be obtained, due to the plate thickness differences and the elastic return, by measuring pressure variations provided by the differential pressure sensor TDP around the zero value.
  • a punch tool UP which can replace the matrix die tool UM, is alternatively connected with dashed lines as device for detecting the bending angle.
  • the parameter to be verified could be the compressed air outflow rate, such rate value changing depending on orifice clogging by the plate sheet.
  • a single pressure measuring system can be used with different pairs of orifices obtained in different matrix dies or punches, by every time selecting solenoid valves on respective pneumatic supply ducts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
US10/588,904 2004-02-18 2005-01-25 Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press Abandoned US20070186602A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITPR2004A000010 2004-02-18
IT000010A ITPR20040010A1 (it) 2004-02-18 2004-02-18 Procedimento e dispositivo pneumatico per rilevare l'angolo di piega di un foglio di lamiera in una pressa piegatrice.
PCT/EP2005/000690 WO2005077559A1 (en) 2004-02-18 2005-01-25 Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press

Publications (1)

Publication Number Publication Date
US20070186602A1 true US20070186602A1 (en) 2007-08-16

Family

ID=34856956

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/588,904 Abandoned US20070186602A1 (en) 2004-02-18 2005-01-25 Process and pneumatic device for detecting the bending angle of a plate sheet in a bending press

Country Status (7)

Country Link
US (1) US20070186602A1 (de)
EP (1) EP1715968B1 (de)
JP (1) JP2007522944A (de)
AT (1) ATE508812T1 (de)
ES (1) ES2366566T3 (de)
IT (1) ITPR20040010A1 (de)
WO (1) WO2005077559A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090293576A1 (en) * 2004-11-17 2009-12-03 Amada Company, Limited Bending method, and die and bending machine used for the bending method
US20130047416A1 (en) * 2011-08-22 2013-02-28 Wei-Ming Sim Method of manufacturing an elongate component
CN103389063A (zh) * 2013-08-12 2013-11-13 南京埃斯顿自动化股份有限公司 采用管道压力自动测量折弯机折弯角度的装置
CN112718942A (zh) * 2020-12-08 2021-04-30 江苏弘东工业自动化有限公司 用于折弯机的折弯角度校正方法
US10996150B2 (en) * 2017-06-29 2021-05-04 Lg Chem, Ltd. Jig assembly comprising bending jig and apparatus and method for measuring bending tensile strength using the same
CN114526696A (zh) * 2022-04-22 2022-05-24 南通亚元新材料有限公司 一种金属材料构件生产质检用折角快速检测工具
CN116329400A (zh) * 2023-03-28 2023-06-27 江苏振世达汽车模具有限公司 一种新能源汽车厚板料外覆盖件拉伸模具镶块斜拼缝结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT516146B1 (de) * 2014-09-15 2016-03-15 Trumpf Maschinen Austria Gmbh Kalibrierverfahren für eine Biegemaschine
CN107243526A (zh) * 2016-07-21 2017-10-13 深圳市海盾五金工具有限公司 一种智能控制的电力设备用零件的弯曲装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5099666A (en) * 1989-11-14 1992-03-31 Amada Company, Limited Method and device for detecting folding angles of a metal sheet during folding
US6553803B1 (en) * 1999-09-08 2003-04-29 Bystronic Laser Ag Method and an apparatus for determining the bending angle of a work piece to be bent

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1072273B (it) 1977-02-01 1985-04-10 Selecontrol Sas Dispositivo per la rilevazione e regolazione di angoli di piega particolarmente adatto per presse-piegatrici
IT1294147B1 (it) 1997-07-25 1999-03-22 Luciano Gasparini Dispositivo di misurazione su 4 punti dell'angolo di piega,in un procedimento di presso-piegatura della lamiera metallica,e macchina
IT1293374B1 (it) 1997-06-20 1999-02-25 Luciano Gasparini Procedimento perfezionato di presso-piegatura della lamiera metallica con sistema di misurazione su 4 punti dell'angolo di piega, e macchina
NL1013378C2 (nl) 1999-10-22 2001-04-24 Best Quality B V Inrichting en werkwijze voor het bepalen van een zethoek van een plaat en het gebruik daarvan voor het zetten van platen.
DE10006512C2 (de) 2000-02-15 2002-07-18 Colgar Spa Vorrichtung für eine Abkantpresse zum Messen des Biegewinkels am Werkstück

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5099666A (en) * 1989-11-14 1992-03-31 Amada Company, Limited Method and device for detecting folding angles of a metal sheet during folding
US6553803B1 (en) * 1999-09-08 2003-04-29 Bystronic Laser Ag Method and an apparatus for determining the bending angle of a work piece to be bent

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090293576A1 (en) * 2004-11-17 2009-12-03 Amada Company, Limited Bending method, and die and bending machine used for the bending method
US8534105B2 (en) * 2004-11-17 2013-09-17 Amada Company, Limited Bending method, and die and bending machine used for the bending method
US20130047416A1 (en) * 2011-08-22 2013-02-28 Wei-Ming Sim Method of manufacturing an elongate component
US9201417B2 (en) * 2011-08-22 2015-12-01 Airbus Operations Limited Method of manufacturing an elongate component
CN103389063A (zh) * 2013-08-12 2013-11-13 南京埃斯顿自动化股份有限公司 采用管道压力自动测量折弯机折弯角度的装置
US10996150B2 (en) * 2017-06-29 2021-05-04 Lg Chem, Ltd. Jig assembly comprising bending jig and apparatus and method for measuring bending tensile strength using the same
CN112718942A (zh) * 2020-12-08 2021-04-30 江苏弘东工业自动化有限公司 用于折弯机的折弯角度校正方法
CN114526696A (zh) * 2022-04-22 2022-05-24 南通亚元新材料有限公司 一种金属材料构件生产质检用折角快速检测工具
CN116329400A (zh) * 2023-03-28 2023-06-27 江苏振世达汽车模具有限公司 一种新能源汽车厚板料外覆盖件拉伸模具镶块斜拼缝结构

Also Published As

Publication number Publication date
JP2007522944A (ja) 2007-08-16
WO2005077559A1 (en) 2005-08-25
EP1715968A1 (de) 2006-11-02
ATE508812T1 (de) 2011-05-15
ES2366566T3 (es) 2011-10-21
ITPR20040010A1 (it) 2004-05-18
EP1715968B1 (de) 2011-05-11

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Legal Events

Date Code Title Description
AS Assignment

Owner name: TASK 84 S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CELLA, GIOVANNI;REEL/FRAME:018200/0841

Effective date: 20060605

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION