US20130312479A1 - Bending machine - Google Patents

Bending machine Download PDF

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Publication number
US20130312479A1
US20130312479A1 US13/984,317 US201213984317A US2013312479A1 US 20130312479 A1 US20130312479 A1 US 20130312479A1 US 201213984317 A US201213984317 A US 201213984317A US 2013312479 A1 US2013312479 A1 US 2013312479A1
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US
United States
Prior art keywords
deflection
punch
frame
die
bending
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
US13/984,317
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English (en)
Inventor
Hirohito Nagahashi
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.)
Amada Co Ltd
Original Assignee
Amada Co 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 Amada Co Ltd filed Critical Amada Co Ltd
Assigned to AMADA COMPANY, LIMITED, reassignment AMADA COMPANY, LIMITED, ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAGAHASHI, Hirohito
Publication of US20130312479A1 publication Critical patent/US20130312479A1/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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—Deflection compensating means

Definitions

  • the present invention relates to a bending machine for bending sheet materials, especially, relates to a bending machine that requires no trial bending.
  • Patent Document 1 listed below discloses a prior-art bending machine (press brake).
  • a punch-side table provided with a punch is disposed on its one side (upper side), and a die-side table provided with a die is disposed on its other side (lower side).
  • a sheet material is bent between the punch and the die by stroking the punch to apply pressure to sheet material.
  • a stroke of the punch is detected by a punch detector. The stroke may be changed by a thermal deformation of a frame. Therefore, when the stroke detected by the punch detector is not an expected amount, bending is done accurately by compensating the stroke.
  • a trial bending(s) is done for each specification [material, sheet thickness, shape (bending length)] of sheet materials to be bent.
  • a bending work there are two types of working methods, air bending and coining. Note that air bending can be further classified into partial bending and bottoming. Namely, a bending work can be classified into three types working methods, partial bending, bottoming and coining.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2000-343128
  • an object of the present invention is to provide a bending machine that can improve working efficiency by rendering a trial bending unnecessary and can bring a good working condition.
  • An aspect of the present invention provides a bending machine that includes a frame that includes a base section, and a punch-side frame section and a die-side frame section that are extended from both sides of the base section in an identical direction, respectively, a punch holder that is provided on the punch-side frame section and to which a punch is attached, a die holder that is provided on the die-side frame section and to which a die is attached, a pressing mechanism that presses the punch toward the die to bend a sheet material between the die and the punch, a first deflection detector that is provided in the pressing mechanism and detects a displacement of the punch required for bending the sheet material, a second deflection detector that is supported by the die-side frame section and detects an actual displacement of the punch, and a controller operable to previously store a relation between a deflection of the frame 2 and a bending length, material and a sheet thickness of a sheet material, to calculate an actual deflection of the frame by subtracting a detection value of the second deflection detector from
  • the controller stores the relation between a deflection of the frame and a bending length, material and a sheet thickness of a sheet material
  • the pressing mechanism is controlled so that the actual deflection of the frame that is calculated based on the detection values of the first deflection detector and the second deflection detector is made consistent with the target deflection associated with a sheet material to be bent (and retrieved based on the relation). Therefore, the sheet material can be bent under a good working condition, and, further, no trial bending is required. As a result, working labors for bending a sheet material can be reduced.
  • the pressing mechanism includes a motor for pressing that moves the punch toward the die, the first deflection detector is an encoder that detects rotations of the motor, and the second deflection detector is a scale that is supported by the die-side frame section via a support frame.
  • the first deflection detector is the encoder of the motor for moving the punch and the second deflection detector is the scale for detecting the displacement of the punch, the actual deflection of the frame can be directly detected while bending a sheet material. Therefore, the controller can be control the motor precisely.
  • the controller includes a deflection calculator that calculates the actual deflection of the frame from detection results of the first deflection detector and the second deflection detector, and a memory for storing a data table in which the relation is defined.
  • the deflection calculator calculates the actual deflection of the frame and the data table in which the above relation is defined is stored in the memory, the relation between a deflection and a sheet material can be perceived accurately. Therefore, a sheet material can be bent successfully with no trial bending.
  • FIG. 1 It is an overall front view of a bending machine according to an embodiment.
  • FIG. 2 It is a block diagram of a controller in the bending machine.
  • FIG. 3 It is a flowchart for a drive control for the bending machine.
  • FIG. 4 It shows tables stored in the controller.
  • the bending machine 1 includes a frame 2 , a pressing mechanism 3 , a detection mechanism 4 , and a controller 5 .
  • the frame 2 is configured of a base section 21 having a given length, and a punch-side frame section 23 and a die-side frame section 25 that are integrally extended from both sides of the base section 21 , respectively.
  • the punch-side frame section 23 and the die-side frame section 25 are vertically extended from the base section 21 in an identical direction, respectively.
  • a punch 6 and the pressing mechanism 3 are provided on the punch-side frame section 23 .
  • a die 7 is provided on the die-side frame section 25 .
  • the pressing mechanism 3 includes a ball screw 30 supported on the punch-side frame section 23 , and a motor 32 for pressing.
  • the ball screw 30 can move linearly along its axial direction.
  • a coupling bracket 31 is coupled to an end of the ball screw 30 .
  • a punch holder 8 is attached to the coupling bracket 31 .
  • the punch 6 is attached to an end of the punch holder 8 .
  • the punch 6 presses a sheet material due to a movement of the ball screw 30 , and thereby the sheet material is bent between the punch 6 and the die 7 .
  • the punch 6 is moved by the motor 32 .
  • the motor 32 has a reduction gear 33 on its output side.
  • a nut 34 is coupled with the reduction gear 33 .
  • the ball screw 30 is meshed with the nut 34 to penetrate therethrough.
  • the nut 34 is rotated in its forward/backward direction by the motor 32 , the ball screw 30 moves linearly in its feeding/reversing direction. Then, a sheet material is pressed due to the movement of the ball screw 30 in the feeding direction, and thereby the sheet material is bent. In this case, it is required to restrict a rotation of a screw of the ball screw 30 so that the screw is not passively rotated along with the rotation of the nut 34 . Therefore, an anti-rotation unit 38 is provided in the pressing mechanism 3 .
  • the rotation of the motor 32 is controlled by the controller 5 .
  • the number of rotations of the motor 32 is detected by an encoder 11 .
  • the encoder 11 is a first deflection detector, and an actual stroke of the punch 6 toward the die 7 is detected by detecting the number of rotations of the motor 32 .
  • the stroke detected by the encoder 11 includes a deflection of the frame 2 caused by pressing a sheet material.
  • a detection result of the encoder 11 is output to the controller 5 .
  • a motor 36 for high-speed feeding is provided in the pressing mechanism 3 .
  • the motor 36 moves the punch 6 at high speed to a position just before nipping a sheet material.
  • the motor 36 is coupled to the coupling bracket 31 via a reduction gear 35 .
  • the die 7 is attached to a die holder 10 .
  • the die holder 10 is attached to the die-side frame section 25 of the frame 2 .
  • the die holder 10 is attached to the die-side frame section 25 so that the die 7 and the punch 6 face to each other.
  • the detection mechanism 4 is disposed near the die holder 10 on the frame 2 .
  • the detection mechanism 4 includes a support frame 41 supported by the die-side frame section 25 , and a scale 42 attached to the support frame 41 .
  • the detection mechanism 4 is configured so that, even when a reactive force is generated against a pressing force for bending a sheet material, the reactive force doesn't act on the support frame 41 .
  • the scale 42 is disposed near the punch holder 8 , and detects a relative position of the punch holder 8 to the die holder 10 .
  • the scale 42 is not directly fixed with the frame 2 , but attached to the frame 2 via the support flame 41 . Since the reactive force doesn't act on the support frame 41 , the scale 42 can detect an actual displacement of the punch 6 without a deflection of the frame 2 .
  • the scale 42 is a second deflection detector that detects an actual displacement of the punch 6 when pressing a sheet material.
  • a detection result of the scale 42 is output to the controller 5 .
  • the controller 5 includes a deflection calculator 51 , and data tables 53 .
  • the controller 5 controls the motor 32 and the motor 36 .
  • the deflection calculator 51 calculates a deflection of the frame 2 when pressing a sheet material.
  • the deflection of the frame 2 can be calculated by subtracting a detection value of the scale 42 (the second deflection detector) from a detection value of the encoder 11 (the first deflection detector). Specifically, the deflection of the frame 2 can be obtained by (detection value of the encoder 11 ) ⁇ (detection value of the scale 42 ).
  • the data tables 53 are stored in a memory 56 (explained later) in the controller 5 .
  • recorded are relations between a calculated deflection of the frame 2 and a bending length, material and a sheet thickness of a sheet material.
  • the controller 5 determines a deflection of the frame 2 associated with a bending length, material and a sheet thickness of a sheet material, and then controls the motor 32 so as to achieve the deflection.
  • FIG. 2 is a block diagram showing the controller 5 .
  • an input interface 54 an output interface 55 and the memory 56 are connected with a CPU 58 by a data bus 57 .
  • the above-explained deflection calculator 51 is configured of these components.
  • the encoder 11 , the scale 42 , the motor 32 and the motor 36 that are explained above are also connected with the data bus 57 .
  • the input interface 54 inputs various data to the CPU 58 , and, for example, a keyboard and an external disk drive are connected to the input interface 54 .
  • the output interface 55 outputs data from CPU 58 , and, for example, a display and a printer are connected with the output interface 55 .
  • Data and a work program that are input from the input interface 54 and the above-explained data tables 53 are stored in the memory 56 .
  • the detection results of the encoder 11 and the scale 42 are controlled by commands output from the CPU 58 via the data bus 57 .
  • a, b are constants.
  • FIG. 4 shows the data tables 53 each of which indicates a relation between a sheet material [sheet thickness ⁇ material] and a deflection of the frame.
  • the data tables 53 are made for every sheet material, and the deflection ⁇ is stored in the data tables 53 for each of the above sheet materials. Note that it may be possible to make one data sheet 53 by regarding types of sheet materials as a parameter.
  • the measured deflections ⁇ of the frame 2 are converted to the pressing forces F by the above equation (II), respectively.
  • F AL1 , F AL2 , . . . are calculated (similarly to a sheet material B).
  • F′ AL1 , F′ AL2 , . . . are calculated (similarly to a sheet material B).
  • calculated is an average value Z of all the pressing forces F′ per unit length with respect to each bending length L (L1, L2, L3 . . .
  • step S 11 data of a sheet material to be bent are input to the controller 5 (step S 11 ).
  • the data of the sheet material are a bending length, a sheet thickness and its material.
  • Ld is the bending length in the data input in step S 11 .
  • Z is the required pressing force for the sheet material [sheet thickness ⁇ material] of the data input in step S 11 , and is stored in the controller 5 through the above-explained working tests.
  • a target deflection ⁇ t of the frame 2 is calculated by the above equation (I) based on the calculated target pressing force Ft (step S 12 ).
  • the target deflection ⁇ t of the frame 2 is determined based on the target pressing force Ft calculated in step S 11 . Namely, when the frame 2 involves the deflection ⁇ t, it can be regarded that the target pressing force Ft is applied to the sheet material.
  • the controller 5 does pressing by driving the motor for pressing (step S 13 ). At this time, the detection results of the encoder 11 and the scale 42 are output to the controller 5 .
  • the deflection of the frame 2 due to pressing is measured (step S 14 ).
  • the motor 32 is controlled with feedback based on the value calculated by subtracting the detection value of the scale 42 from the detection value of the encoder 11 , i.e. the actual deflection ⁇ . Specifically, the motor 32 is controlled with feedback so that the actual deflection ⁇ of the frame 2 is made consistent with the target deflection ⁇ t.
  • step S 14 When the deflection ⁇ measured in step S 14 becomes consistent with the target deflection ⁇ t determined in step S 12 , i.e. when the actual pressing force F becomes consistent with the target pressing force Ft, the controller 5 stops the motor 32 (step S 15 ), and bending of the sheet material is finished. If the deflection ⁇ measured in step S 14 doesn't become consistent with the target deflection ⁇ t determined in step S 12 , the process flow returns to step S 13 and driving of the motor 32 is continued by the controller 5 .
  • the controller 5 stores data of relations between a deflection of the frame 2 and a bending length, material and a sheet thickness of a sheet material, and calculates, based on the stored data, a target deflection of the frame 2 associated with a bending length, material and a sheet thickness of a sheet material, and then controls the motor 32 so that an actual deflection of the frame 2 becomes consistent with the target deflection. Therefore, a sheet material can be bent under a good working condition, so that a trial bending(s) can be rendered unnecessary and working labors for bending a sheet material can be reduced.
  • the deflection of the frame 2 is detected by the encoder 11 of the motor 32 for pressing and the scale 42 for detecting the displacement of the punch 6 in the present embodiment, the deflection of the frame 2 can be directly detected while bending a sheet material. Therefore, the controller 5 can control the motor 32 precisely.
  • controller 5 since the controller 5 includes the deflection calculator 51 and the data tables 53 that indicate relations between a deflection and a bending length, material and sheet thickness of a sheet material, a relation between deflection of the frame 2 and a sheet material can be perceived accurately and thereby a sheet material can be bent successfully with no trial bending.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US13/984,317 2011-02-09 2012-02-07 Bending machine Abandoned US20130312479A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011025800 2011-02-09
JP2011-025800 2011-02-09
PCT/JP2012/052761 WO2012108436A1 (fr) 2011-02-09 2012-02-07 Presse-plieuse

Publications (1)

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US20130312479A1 true US20130312479A1 (en) 2013-11-28

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US13/984,317 Abandoned US20130312479A1 (en) 2011-02-09 2012-02-07 Bending machine

Country Status (5)

Country Link
US (1) US20130312479A1 (fr)
EP (1) EP2674232B1 (fr)
JP (1) JP5579877B2 (fr)
CN (1) CN103370150B (fr)
WO (1) WO2012108436A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210162483A1 (en) * 2018-02-14 2021-06-03 Langenstein & Schemann Gmbh Production system, production module, method for operating and setting up a production line, and method for producing a workpiece

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6243752B2 (ja) * 2014-02-25 2017-12-06 株式会社アマダホールディングス プレスブレーキ
CN105598222A (zh) * 2014-11-25 2016-05-25 无锡市恒盛电机有限公司 滚压折弯装置
CN105598219A (zh) * 2014-11-25 2016-05-25 无锡市恒盛电机有限公司 带厚度调节折弯扭矩与多点压力检测的钣金折弯装置
CN105855330B (zh) * 2016-04-07 2017-10-24 扬帆集团股份有限公司 一种船舶钢板弯折装置
JP6243954B2 (ja) * 2016-04-14 2017-12-06 株式会社アマダホールディングス プレスブレーキの安全装置
JP6638022B2 (ja) * 2018-05-28 2020-01-29 株式会社アマダホールディングス プレスブレーキ制御装置、プレスブレーキ制御方法、及び金型
AT523360B1 (de) * 2019-12-19 2022-05-15 Trumpf Maschinen Austria Gmbh & Co Kg Biegemaschine und Kontrolleinrichtung

Citations (2)

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US4486841A (en) * 1980-12-09 1984-12-04 Amada Company, Limited Bending press
US4488237A (en) * 1982-04-29 1984-12-11 Dynamics Research Corporation Two dimensional press brake control system and apparatus

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JP2818275B2 (ja) * 1990-08-25 1998-10-30 松下電工株式会社 曲げ加工方法
JP3202251B2 (ja) * 1991-03-08 2001-08-27 株式会社アマダ 折曲げ加工装置
JP3688004B2 (ja) * 1995-03-23 2005-08-24 株式会社小松製作所 プレスブレーキ
IT1295498B1 (it) * 1997-10-17 1999-05-12 Luciano Gasparini Dispositivo per rilevare la flessione delle traverse, inferiore e superiore, finalizzato all'interazione con almeno un sistema di
JP3692261B2 (ja) * 1999-06-24 2005-09-07 アイダエンジニアリング株式会社 サーボプレスの荷重による下死点補正装置
JP2000343128A (ja) 1999-06-04 2000-12-12 Amada Eng Center Co Ltd 曲げ加工方法および曲げ加工装置
JP2002239800A (ja) * 2000-12-04 2002-08-28 Sintokogio Ltd プレス装置及びプレス装置の制御方法
JP4113948B2 (ja) * 2003-07-17 2008-07-09 独立行政法人産業技術総合研究所 操作力発生装置
JP2006192498A (ja) * 2004-12-15 2006-07-27 Amada Co Ltd 曲げ加工方法及び折曲げ加工機
CN101700544A (zh) * 2009-11-12 2010-05-05 朱斌 数控扭轴同步液压折弯机滑块挠度补偿机构
CN102319777B (zh) * 2011-09-20 2013-04-24 泰安华鲁锻压机床有限公司 一种船用卷板机挠度的自动补偿装置

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Publication number Priority date Publication date Assignee Title
US4486841A (en) * 1980-12-09 1984-12-04 Amada Company, Limited Bending press
US4488237A (en) * 1982-04-29 1984-12-11 Dynamics Research Corporation Two dimensional press brake control system and apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210162483A1 (en) * 2018-02-14 2021-06-03 Langenstein & Schemann Gmbh Production system, production module, method for operating and setting up a production line, and method for producing a workpiece

Also Published As

Publication number Publication date
WO2012108436A1 (fr) 2012-08-16
JPWO2012108436A1 (ja) 2014-07-03
EP2674232A4 (fr) 2016-09-07
JP5579877B2 (ja) 2014-08-27
CN103370150A (zh) 2013-10-23
EP2674232A1 (fr) 2013-12-18
CN103370150B (zh) 2016-04-20
EP2674232B1 (fr) 2017-05-10

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AS Assignment

Owner name: AMADA COMPANY, LIMITED,, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NAGAHASHI, HIROHITO;REEL/FRAME:030968/0305

Effective date: 20130612

STCB Information on status: application discontinuation

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