WO1991013706A1 - Method for bending pipes - Google Patents
Method for bending pipes Download PDFInfo
- Publication number
- WO1991013706A1 WO1991013706A1 PCT/FI1991/000067 FI9100067W WO9113706A1 WO 1991013706 A1 WO1991013706 A1 WO 1991013706A1 FI 9100067 W FI9100067 W FI 9100067W WO 9113706 A1 WO9113706 A1 WO 9113706A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- bending
- bend
- information
- basis
- Prior art date
Links
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
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/12—Bending rods, profiles, or tubes with programme control
-
- 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
- G05B19/42—Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine
- G05B19/4202—Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine preparation of the programme medium using a drawing, a model
- G05B19/4207—Recording and playback systems, i.e. in which the programme is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine preparation of the programme medium using a drawing, a model in which a model is traced or scanned and corresponding data recorded
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/31—From computer integrated manufacturing till monitoring
- G05B2219/31033—Record on site dimensions of pipe, tube configuration, to install pipe
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/31—From computer integrated manufacturing till monitoring
- G05B2219/31205—Remote transmission of measured values from site, local to host
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/36—Nc in input of data, input key till input tape
- G05B2219/36283—Select, enter machining, cutting conditions, material file, tool file
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37403—Bending, springback angle
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45143—Press-brake, bending machine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Definitions
- the present invention relates to the method defined in the introductory section of patent claim 1.
- the methods known in the prior art for bending metal pipes and for determining their bending points are based on the planning of pipe routes, where the routing of the pipe is at the first stage defined on geometrical grounds only.
- a drawback with the prior art methods is that they are inaccurate and time-consuming, because the geometrical definition of the pipe's routing does not alone secure the dimensional accuracy of the final bent pipe. Therefore, owing to the extension and spring-back taking place during the bending process, roughly 60 - 70 % of the time consumed in the preparation of the production is used for corrections, where the pipe plans are adapted to suit the production.
- An iterative com ⁇ puter aided bending method has also been used.
- Another drawback with the prior art methods is that, owing to their complicated nature, they offer chances to several human errors.
- the object of the method of the present inven ⁇ tion is to eliminate the above mentioned drawbacks.
- a particular object of the invention is to introduce a method which enables automatization at the planning and production stages of pipe bending.
- Another object of the invention is to intro ⁇ quiz a method which utilizes real, experimental informa- tion of the behaviour of the pipe while bending.
- Yet another object of the invention is to introduce a method which remarkably speeds up the plann ⁇ ing and bending of a pipe.
- the method of the present invention is charac- terized by the novel features enlisted in the patent claim 1.
- the geometrical information for the pipe such as the lengths of the straight parts and the bending radiuses and planes of the pipe angles;
- the geometrical routing of the pipe is deter ⁇ mined by defining the coordinates of the bending points on the site of installation, or by directly measuring the lengths of the straight parts of the pipe, as well as the angles and planes of bend. A separate file can be created of the routing of the pipe.
- the geometrical routing of the pipe is determined by means of vector operations, on the basis of the coordinates of the bending points.
- the geometrical routing of the pipe is determined by first defining the coordinates of the bending points, and by then calculating, on the basis of these, the lengths of the straight parts, the angles of bend, the bending plane vectors, the angles between the bending planes, the handedness of the planes and the total sum of the angles of rotation of the bending planes.
- the file is created on the basis of bending ex ⁇ periments, carried out with various size groups of pipes, various wall thicknesses and various bend angles, in order to determine the correlation between the actual bend angle and the target angle, as well as the spring- back.
- the file is created on the basis of bending ex ⁇ periments with various pipe sizes, various wall thick ⁇ nesses and various angles of bend, in order to deter ⁇ mine the correlation between the initial length of the pipe blank and the length after the bending, as well as the bending extension.
- a bending radius is chosen for the bending tool of the bending machine, and the real angle of bend for the chosen bending tools is defined on the basis of the desired angle of bend and the chosen pipe size and wall thickness, by utilizing the recorded spring-back infor ⁇ mation, corresponding to the pipe size and thickness, and the desired angle of bend.
- the spring-back readings recorded in the file are interpo ⁇ lated and/or extrapolated.
- the method in order to create the bending instructions there are calculated the successive real bending points for the bending machine by taking into account the extension information recorded in the file with respect to the pipe size and wall thickness, as well as to the desired angle of bend.
- the spring-back readings recorded in the file are interpolated and/or extrapolated.
- the total length of the straight pipe blank is calculated in order to create the bending instructions.
- the locations of the limiter ⁇ to be programmed for the bending machine are calculated in order to create the bending instructions.
- An advantage of the invention is that both the planning of the bending of the pipe, as well as the bending itself, can be automated.
- the created files are most advantageously processed by using the process ⁇ ing and calculation programme designed according to the present invention.
- This programme checks all steps of the method one by one in order to obtain the instruc ⁇ tions for bending the pipe, i.e a pipe route or part thereof, and further in order to realize the same. This procedure reduces the chances of human errors down to a minimum and speeds up both the planning and produc ⁇ tion processes.
- Another advantage of the invention is that after bending, the ready-made pipe can be transported to the site of installation and installed without having to make any modifications.
- a file for instance a database or a table, most advantageously of a type which can be stored into a computer's memory, to be used by a suitable processing and calculation programme.
- the file is created only once and updated thereafter. If required, the experiments can always be carried out anew, for instance with new pipe sizes, and the file updated.
- the coordinates of the bending points of the pipe are measured on the intended site of installation by means of theodolite measurement, and recorded in the memory of the measuring computer.
- the coor- dinate readings are transmitted from the measuring computer to the processing computer proper, for instance directly from the site of measurement by means of a modem connection or data communications, on a datacar- rier such as a diskette, or in some other suitable fashion.
- the standard information is re ⁇ corded in the tables (pipe sizes, respective spring- backs and extensions at different angles of bend) .
- the initial readings can be obtained in many different ways.
- the measured coor ⁇ dinates of the bending points are fed into the system, whereafter there are carried out some vector opera ⁇ tions, i.e. the lengths of the straight parts, the angles of bend, the vectors of the planes of bend, the angles between the planes of bend, the handedness of the planes and the summed-up angles of rotation of the planes of bend are calculated directly from the coordi ⁇ nates.
- vector opera ⁇ tions i.e. the lengths of the straight parts, the angles of bend, the vectors of the planes of bend, the angles between the planes of bend, the handedness of the planes and the summed-up angles of rotation of the planes of bend are calculated directly from the coordi ⁇ nates.
- the bend ⁇ ing information Thereafter begins the calculation of the bend ⁇ ing information, and there is first chosen the radius of the bending disk of the bending machine. Then the influence of the spring-back in the angle of bend is taken into account by utilizing the experimentally predetermined values recorded in the file.
- the actual angle of bend for the chosen bending tool is defined on the basis of the desired angle of bend, as well as the chosen pipe size and wall thickness, with reference to the recorded spring-back information corresponding to the pipe size and wall thickness, as well as to the desired angle of bend. If the desired target angle is not found in the file as such, the corresponding values can be obtained by interpolating or extrapolating the recorded readings.
- the successive actual bending points for the bending machine by taking into account the recorded extension information with respect to the pipe size and wall thickness, as well as to the desired angle of bend.
- the intermediate and/or external readings are obtained as above, by means of interpolating or extrapolating the readings recorded in the file. Then it is tested whether the first and last elements of the pipe are sufficiently long, so that the limitations of the bending machine in question should not hinder bending. If they are not long enough, the lengths are increased.
- the pipe contains junctions or flanges, they are treated separately. This is explained below. If the pipe does not contain junctions or flanges, the bending data is written out and recorded (for example in the memory of a computer) and the iso ⁇ metric images are drawn on a display screen or on paper by a plotter. Because the dimensions of the actual pipe routing are now determined, a list of required supplies can be created and written out, whereafter we can return to the main menu. The various steps of the method have now been gone through, and it is checked whether the created bending information is recorded. If not, it can be recorded, and the processing of the matter can be finished.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI923992A FI923992A (en) | 1990-03-07 | 1992-09-07 | FOERFARANDE FOER BOCKNING AV ROER |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI901153A FI901153A (en) | 1990-03-07 | 1990-03-07 | FOERFARANDE FOER BOEJNING AV ROER. |
FI901153 | 1990-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991013706A1 true WO1991013706A1 (en) | 1991-09-19 |
Family
ID=8530019
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1991/000067 WO1991013706A1 (en) | 1990-03-07 | 1991-03-07 | Method for bending pipes |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0518910A1 (en) |
AU (1) | AU7343891A (en) |
CA (1) | CA2077642A1 (en) |
FI (1) | FI901153A (en) |
WO (1) | WO1991013706A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0760496A2 (en) * | 1995-08-29 | 1997-03-05 | Hubert Niemann | Method to determine blank dimensions of tops |
EP0789289A3 (en) * | 1996-02-09 | 1998-10-21 | Faro Technologies Inc. | Method for designing or producing bent tubing |
US5992210A (en) * | 1997-11-17 | 1999-11-30 | Eagle Precision Technologies Inc. | Tube bending apparatus and method |
EP1308223A2 (en) * | 2001-11-05 | 2003-05-07 | SCHÜCO International KG | Simulating method of a 3-roll-bending process |
EP1472627A2 (en) * | 2002-02-05 | 2004-11-03 | GCC, Inc. | System and method for drawing and manufacturing bent pipes |
EP1690609A1 (en) * | 1998-02-03 | 2006-08-16 | Kabushiki Kaisha Opton | Bending device |
WO2010139394A1 (en) * | 2009-06-05 | 2010-12-09 | Rosenberger Ag | Process for bending elongate workpieces |
US10613514B2 (en) | 2011-05-25 | 2020-04-07 | Greenlee Tools, Inc. | Fabrication and tracking |
CN115815367A (en) * | 2023-02-07 | 2023-03-21 | 江苏新恒基特种装备股份有限公司 | Elbow wall thickness quality prediction method and system based on molding parameters |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2064485A1 (en) * | 1969-12-31 | 1971-07-22 | Rolls Royce | Method for making a copy of a tubular or rod-shaped model! |
US3653251A (en) * | 1969-02-28 | 1972-04-04 | British Aircraft Corp Ltd | Pipe bending |
DE2143692B2 (en) * | 1971-09-01 | 1975-07-03 | Rigobert Dipl.-Ing. 5000 Koeln Schwarze | Numerically controlled tube-bending machine - using four decade switches and comparator, to allow for spring-back of the tube |
US4161110A (en) * | 1977-04-28 | 1979-07-17 | EVG Entwicklungs- und Verwertungs-Gesellschaft mbH. | Automatic control device for a bending machine |
GB2235640A (en) * | 1989-09-07 | 1991-03-13 | Usui Kokusai Sangyo Kk | Tube bending machine with programmed bending |
-
1990
- 1990-03-07 FI FI901153A patent/FI901153A/en not_active Application Discontinuation
-
1991
- 1991-03-07 EP EP91905091A patent/EP0518910A1/en not_active Withdrawn
- 1991-03-07 WO PCT/FI1991/000067 patent/WO1991013706A1/en not_active Application Discontinuation
- 1991-03-07 AU AU73438/91A patent/AU7343891A/en not_active Abandoned
- 1991-03-07 CA CA002077642A patent/CA2077642A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3653251A (en) * | 1969-02-28 | 1972-04-04 | British Aircraft Corp Ltd | Pipe bending |
DE2064485A1 (en) * | 1969-12-31 | 1971-07-22 | Rolls Royce | Method for making a copy of a tubular or rod-shaped model! |
DE2143692B2 (en) * | 1971-09-01 | 1975-07-03 | Rigobert Dipl.-Ing. 5000 Koeln Schwarze | Numerically controlled tube-bending machine - using four decade switches and comparator, to allow for spring-back of the tube |
US4161110A (en) * | 1977-04-28 | 1979-07-17 | EVG Entwicklungs- und Verwertungs-Gesellschaft mbH. | Automatic control device for a bending machine |
GB2235640A (en) * | 1989-09-07 | 1991-03-13 | Usui Kokusai Sangyo Kk | Tube bending machine with programmed bending |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0760496A3 (en) * | 1995-08-29 | 1998-08-26 | Hubert Niemann | Method to determine blank dimensions of tops |
EP0760496A2 (en) * | 1995-08-29 | 1997-03-05 | Hubert Niemann | Method to determine blank dimensions of tops |
EP0789289A3 (en) * | 1996-02-09 | 1998-10-21 | Faro Technologies Inc. | Method for designing or producing bent tubing |
US5992210A (en) * | 1997-11-17 | 1999-11-30 | Eagle Precision Technologies Inc. | Tube bending apparatus and method |
EP1690609A1 (en) * | 1998-02-03 | 2006-08-16 | Kabushiki Kaisha Opton | Bending device |
EP1308223A2 (en) * | 2001-11-05 | 2003-05-07 | SCHÜCO International KG | Simulating method of a 3-roll-bending process |
EP1308223A3 (en) * | 2001-11-05 | 2004-09-22 | SCHÜCO International KG | Simulating method of a 3-roll-bending process |
EP1472627A2 (en) * | 2002-02-05 | 2004-11-03 | GCC, Inc. | System and method for drawing and manufacturing bent pipes |
EP1472627A4 (en) * | 2002-02-05 | 2007-05-23 | Gcc Inc | System and method for drawing and manufacturing bent pipes |
US7305274B2 (en) | 2002-02-05 | 2007-12-04 | Gcc, Inc. | System and method for drawing and manufacturing bent pipes |
WO2010139394A1 (en) * | 2009-06-05 | 2010-12-09 | Rosenberger Ag | Process for bending elongate workpieces |
US10613514B2 (en) | 2011-05-25 | 2020-04-07 | Greenlee Tools, Inc. | Fabrication and tracking |
US11269310B2 (en) | 2011-05-25 | 2022-03-08 | Greenlee Tools, Inc. | Fabrication and tracking |
US11733675B2 (en) | 2011-05-25 | 2023-08-22 | Greenlee Tools, Inc. | Fabrication and tracking |
CN115815367A (en) * | 2023-02-07 | 2023-03-21 | 江苏新恒基特种装备股份有限公司 | Elbow wall thickness quality prediction method and system based on molding parameters |
Also Published As
Publication number | Publication date |
---|---|
EP0518910A1 (en) | 1992-12-23 |
FI901153A (en) | 1991-09-08 |
CA2077642A1 (en) | 1991-09-08 |
AU7343891A (en) | 1991-10-10 |
FI901153A0 (en) | 1990-03-07 |
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