US20100281937A1 - Machine for continuously bending an elongated workpiece at predetermined radii - Google Patents

Machine for continuously bending an elongated workpiece at predetermined radii Download PDF

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Publication number
US20100281937A1
US20100281937A1 US12/775,017 US77501710A US2010281937A1 US 20100281937 A1 US20100281937 A1 US 20100281937A1 US 77501710 A US77501710 A US 77501710A US 2010281937 A1 US2010281937 A1 US 2010281937A1
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United States
Prior art keywords
curvature
radius
bending
machine
elongated workpiece
Prior art date
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Abandoned
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US12/775,017
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English (en)
Inventor
Alessandro Caporusso
Eugenio SCHIARANTE
Giuseppe ROSO
Silvio REA
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CML International SpA
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CML International SpA
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Publication date
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Assigned to CML INTERNATIONAL S.P.A. reassignment CML INTERNATIONAL S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CAPORUSSO, ALESSANDRO, Rea, Silvio, ROSO, GIUSEPPE, SCHIARANTE, EUGENIO
Publication of US20100281937A1 publication Critical patent/US20100281937A1/en
Abandoned legal-status Critical Current

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    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths
    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/401—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for measuring, e.g. calibration and initialisation, measuring workpiece for machining purposes

Definitions

  • the present invention relates to a machine for continuously bending an elongated workpiece at predetermined radii.
  • a machine for continuously bending an elongated workpiece at predetermined radii In the following reference is made to a pyramidal roller bending machine; however this should not be understood as limiting the scope of the present invention.
  • EP 1 644 140 in the name of ORTIC AB of Borlange describes a method of process monitoring and controlling for continuous bending of an elongated workpiece to a predetermined radius by using three parallel contact-free distance meters of the laser transmitter type and by measuring the distances to the bent surface on the workpiece, by calculating the actual radius of curvature based on the fixed distances between the meters and the measured distances, and adjusting the bending machine in response to the relation between the calculated actual radius and the desired radius.
  • the cited patent requires three laser devices, a mounting arrangement of the three laser devices, and a co-ordinating and control circuit for the three laser devices. Further, since very large radii of curvature such as those of bent sheet are measured, the three laser devices are positioned at a high fixed distance of about 200 mm one from the other and very far from the exit point of the sheet from the last roller of the machine. These distances would not be acceptable for a bending machine according to the present invention whose aim is to check the curvature of pipes having quite small radii of curvature with respect to those of the cited patent, and in a point very near to the exit of the last roller.
  • a main object of the invention is to permit a radius of curvature measuring in a bend section that is bent by a single device that does not suffer drawbacks connected to the mounting of a plurality of devices.
  • a detecting device that is to-day used for a different function i.e. simultaneously measuring several points of a workpiece being scanned, could be helpful.
  • the present inventors had the idea of using the displacement sensor keeping it still so that the laser beam thereof intersects longitudinally the moving workpiece to be measured while it is buckled by a bending machine.
  • the displacement sensor is able to determine the radius of curvature of an elongated workpiece being bent by contemporaneously measuring at least three points. This information is used to be compared with a radius that should be actually obtained on the elongated workpiece so that the desired adjustments can be made by the machine in a manner to obtain the bending of a pipe or sections different from a pipe by one pass or more.
  • the present invention provides a machine for continuously bending an elongated workpiece at predetermined radii, machine that uses a series of driving rollers for bending, and a computer that is coupled among other to a laser meter for calculating a radius of a bend section and comparing the calculated radius of curvature with the desired radius of curvature in said bend section, the computer being coupled also to a length meter for measuring a length of said bend section concentrically to the elongated workpiece, and to operating means adapted to operate a roller of the series of driving rollers for bending in order to adjust it in real time on the base of a difference between said measured radius of curvature and the desired radius of curvature in said bend section, characterised in that said laser meter is a high-accuracy 2D laser displacement sensor for measuring the radius of curvature of the elongated workpiece downstream said series of driving rollers.
  • the machine according to the present invention has the advantage of not requiring a plurality of distance meters, such as three laser transmitters, but only one. Thus, a consequent cost saving as well as a reading nearer to the exit of the pipe from the last roller is achieved.
  • the radius of curvature measuring device makes relative and not absolute measurements, whereby the measuring device can be mounted on a movable equipment such as the third roller of the pyramidal bending machine in the feeding direction of the pipe.
  • a further advantage is that the measuring device can rotate about a hub of the third roller in order to be positioned for striking the pipe in a zone just downstream the third roller. Thereby, the radius of curvature of the just bent pipe section is measured, and the displacement of the deforming roller can be feedback changed in the point nearest to the deformation point of the pipe in order to conform the radius of curvature being obtained to the desired one in single preset pipe sections.
  • FIG. 1 shows very diagrammatically and in partial manner a side view of a bending machine able to continuously bend an elongated workpiece along predetermined radii according to the present invention.
  • the machine on which the invention is embodied by way of an example is a bending and forming machine comprising a series of three driving rollers 1 , 2 , and 3 , for bending at least one of them being a deforming roller.
  • An elongated workpiece to be bent e.g. a pipe T
  • the rollers 1 and 3 are fixed in their position, while the roller 2 is adjustable in its vertical position and can be controlled by the machine to move on the base of a feedback control in the vertical direction with respect to the rollers 1 and 3 .
  • An encoder (not shown) is associated to the roller 2 adjustable in the vertical direction, and an encoder for measuring the feeding of the tube T through the series of rollers 1 , 2 , and 3 , is indicated as 4 .
  • a 2D laser displacement sensor as a contact-free meter is indicated generally at 5 , that is pivotally mounted in a support 6 being connected to the hub of the roller 3 , e.g. a high-accuracy 2D laser displacement sensor of the above cited type.
  • an aiming direction y of the 2D laser displacement sensor 5 is represented by a dash line vertical to the plane of the sheet.
  • the aiming direction can be suitably selected also in dependence of the radius of the pipe exiting the roller 3 , preferably in order to approach as near as possible the exit point from the roller 3 , e.g. along the line that is indicated as y′ in FIG. 1 .
  • An arrow G in the figure indicates that the support 6 sustaining the 2D laser displacement sensor 5 can be adjusted in its swinging.
  • the machine according to the described diagram further comprises a schematically shown central computer 7 for data controlling and processing, whose task is to create a correspondence between the machine movements and the desired bend drawing that can be also graphically inserted through a video device (not shown), possibly also of a “touch screen” type.
  • a digital analog device I/O and a signal conditioner which has the function of filtering and stabilising digital analog signals that arrive from various mechanical, hydraulic and electronic components of the machine. These components are known and then are neither shown, nor described. Only an operating means of the roller 3 , e.g. a hydraulic cylinder, is indicated at 8 .
  • the machine can operate by a method already described in an earlier patent application No. RM2008A000078 of the same inventors.
  • the bend is defined through a succession of third order polynomial functions.
  • Such functions that are B-splines and Bézier curves interpolating the detected points, need at least three contemporaneous points to be mathematically defined.
  • the points are obtained by the sole laser measuring device.
  • the calculation of the radius of curvature of each bend section of the elongated workpiece is made for obtaining a radius of curvature of a bend section by a machine employing a laser displacement sensor of the type produced by Keyence series LJ-G measuring at least three contemporaneous points, but by means of a sole laser meter in one direction.
  • the measurement method above described can be applied as follows. By knowing in any case a single point of measurement, both an orientation of the bend or bends as produced and any correction to be made when the material used is changed or by mechanical modifications occurring in the working phases, can be measured with accuracy.
  • the machine permits the automatic compensation both of errors due to the elastic characteristic of the material used and any electromechanical variations occurring when different components are used, and due to wear of the same components.
  • a fitting procedure of the elongated workpiece as controlled by the laser meter allows the waste of material in the production to be decreased automatically.
  • the same procedure permits one person to decide autonomously the fitting length of the material. It is clear that all the errors due to the positioning of the material to be worked on the machine are annulled.
  • the one reading point has the advantage of increasing far the ease of operation of the machine.
  • the machine allows a plurality of consecutive pipes to be worked in order to obtain very long arcs.
  • the machine in which the present invention is embodied is a bending machine whose upper roller 2 is the deforming roller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
US12/775,017 2009-05-06 2010-05-06 Machine for continuously bending an elongated workpiece at predetermined radii Abandoned US20100281937A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM2009A000215A IT1394105B1 (it) 2009-05-06 2009-05-06 Macchina per curvare in modo continuo un pezzo allungato secondo raggi predeterminati
ITRM2009A000215 2009-05-06

Publications (1)

Publication Number Publication Date
US20100281937A1 true US20100281937A1 (en) 2010-11-11

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US12/775,017 Abandoned US20100281937A1 (en) 2009-05-06 2010-05-06 Machine for continuously bending an elongated workpiece at predetermined radii

Country Status (15)

Country Link
US (1) US20100281937A1 (it)
EP (1) EP2248611B1 (it)
JP (1) JP2010260105A (it)
KR (1) KR20100120623A (it)
CN (1) CN101879542B (it)
AT (1) ATE539830T1 (it)
AU (1) AU2010201786A1 (it)
CA (1) CA2703070A1 (it)
ES (1) ES2382977T3 (it)
IT (1) IT1394105B1 (it)
MX (1) MX2010004994A (it)
PL (1) PL2248611T3 (it)
PT (1) PT2248611E (it)
RU (1) RU2448798C2 (it)
TW (1) TW201109103A (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130074559A1 (en) * 2010-01-27 2013-03-28 Pandrol Limited Methods of manufacturing a resilient rail clip
US20150135787A1 (en) * 2013-11-19 2015-05-21 Cte Sistemi S.R.L. Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
US20160175999A1 (en) * 2013-03-07 2016-06-23 Doosan Heavy Industries & Construction Co., Ltd. Method for producing membrane wall, pipe bending device for manufacturing transfer duct and method for manufacturing transfer duct using same
CN108453149A (zh) * 2018-05-15 2018-08-28 江阴市博汇机械成套设备有限公司 一种大型薄壁筒体的整形工装
CN109226384A (zh) * 2018-09-06 2019-01-18 泰安华鲁锻压机床有限公司 一种全自动型材弯曲机
US10898937B2 (en) 2014-12-12 2021-01-26 Uros Turanjanin Application of the 3D cameras to the profile bending process on the bending machine with three and four rollers
CN113579023A (zh) * 2021-06-23 2021-11-02 新乡市中智重工机械设备有限公司 基于激光测量的型钢弯曲方法
CN115780594A (zh) * 2023-02-13 2023-03-14 南通市通州区金沙不锈钢制品有限公司 一种钣金加工用卷圆机

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IT1400500B1 (it) * 2010-06-22 2013-06-11 Crippa Spa Procedimento per la curvatura di tubi, fili o nastri di metallo a serpentina o a molla e macchinaper curva tubi, fili o nastri di metallo per la fabbricazione di una serpentina o una molla presentante un andamento ad elica comprendente una pluralità di spire
CN101985131A (zh) * 2010-11-26 2011-03-16 中冶南方工程技术有限公司 带尾折弯机
DE102011009660B4 (de) * 2011-01-27 2013-05-29 Sms Meer Gmbh Vorrichtung und Verfahren zum Umformen von Flachprodukten in Schlitzrohre oder Rohrvorprodukte
KR101117113B1 (ko) * 2011-09-28 2012-02-23 (주)예기 보일러용 판넬 튜브 벤딩기
CN102489566A (zh) * 2011-11-29 2012-06-13 攀钢集团工程技术有限公司 钢轨顶弯机自动控制设备
CN102581088B (zh) * 2012-02-29 2013-11-13 无锡洲翔重工科技有限公司 弧线下调式三辊型材卷弯机光电编码器信号采集装置
KR101220528B1 (ko) * 2012-05-16 2013-01-10 김영범 1단과 2단 및 원곡 겸용 철근 절곡기
CN102941256A (zh) * 2012-09-29 2013-02-27 安徽省宁国市晨光汽车零部件有限公司 一种弯管机
FR2997323B1 (fr) * 2012-10-25 2015-04-17 Tube Fixture Procede de fabrication d'un gabarit pour des tubes presentant des troncons cintres, et gabarit realise par la mise en oeuvre de ce procede
JP6041632B2 (ja) * 2012-11-13 2016-12-14 大同マシナリー株式会社 金属板の曲げ加工方法およびその装置
CN102941262B (zh) * 2012-11-23 2014-09-24 贵州安大航空锻造有限责任公司 轴承钢闪光焊薄壁环件的型材弯曲制坯方法
WO2015122863A2 (en) 2014-02-15 2015-08-20 Kaya Necmettin A system and method for measuring piece bending radius instantly
CN103949514A (zh) * 2014-05-12 2014-07-30 明达铝业科技(太仓)有限公司 一种专用的弯弧加工设备
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EP2992976A1 (en) * 2014-09-02 2016-03-09 Siemens Aktiengesellschaft Mobile bending device
US10166593B2 (en) * 2015-09-07 2019-01-01 Hyundai Motor Company Manufacturing method for bumper beam of vehicle
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CN105729743B (zh) * 2016-03-24 2024-02-27 中山市悦辰电子实业有限公司 一种可调节圆弧弯管夹具
CN105772601A (zh) * 2016-05-24 2016-07-20 安徽海澄德畅电子科技有限公司 一种三点式钢筋弯曲弧度管控装置
CN108971267B (zh) * 2017-05-31 2020-01-14 中国石油大学(华东) 一种微变形板材激光矫平方法
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130074559A1 (en) * 2010-01-27 2013-03-28 Pandrol Limited Methods of manufacturing a resilient rail clip
US20160175999A1 (en) * 2013-03-07 2016-06-23 Doosan Heavy Industries & Construction Co., Ltd. Method for producing membrane wall, pipe bending device for manufacturing transfer duct and method for manufacturing transfer duct using same
US10442039B2 (en) * 2013-03-07 2019-10-15 DOOSAN Heavy Industries Construction Co., LTD Method for producing membrane wall, pipe bending device for manufacturing transfer duct and method for manufacturing transfer duct using same
US20150135787A1 (en) * 2013-11-19 2015-05-21 Cte Sistemi S.R.L. Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
US10092937B2 (en) * 2013-11-19 2018-10-09 Cte Sistemi S.R.L. Measuring unit for measuring the bending radius and the forwarding of a workpiece in a bending machine
US10898937B2 (en) 2014-12-12 2021-01-26 Uros Turanjanin Application of the 3D cameras to the profile bending process on the bending machine with three and four rollers
CN108453149A (zh) * 2018-05-15 2018-08-28 江阴市博汇机械成套设备有限公司 一种大型薄壁筒体的整形工装
CN109226384A (zh) * 2018-09-06 2019-01-18 泰安华鲁锻压机床有限公司 一种全自动型材弯曲机
CN113579023A (zh) * 2021-06-23 2021-11-02 新乡市中智重工机械设备有限公司 基于激光测量的型钢弯曲方法
CN115780594A (zh) * 2023-02-13 2023-03-14 南通市通州区金沙不锈钢制品有限公司 一种钣金加工用卷圆机

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ATE539830T1 (de) 2012-01-15
PT2248611E (pt) 2012-04-13
CN101879542B (zh) 2013-04-24
JP2010260105A (ja) 2010-11-18
EP2248611B1 (en) 2012-01-04
ITRM20090215A1 (it) 2010-11-07
AU2010201786A1 (en) 2010-11-25
KR20100120623A (ko) 2010-11-16
RU2448798C2 (ru) 2012-04-27
CN101879542A (zh) 2010-11-10
PL2248611T3 (pl) 2012-08-31
IT1394105B1 (it) 2012-05-25
RU2010118060A (ru) 2011-11-10
ES2382977T3 (es) 2012-06-15
MX2010004994A (es) 2010-11-23
TW201109103A (en) 2011-03-16
EP2248611A1 (en) 2010-11-10
CA2703070A1 (en) 2010-11-06

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