WO2009083770A1 - Method for bending pipes - Google Patents
Method for bending pipes Download PDFInfo
- Publication number
- WO2009083770A1 WO2009083770A1 PCT/IB2008/003457 IB2008003457W WO2009083770A1 WO 2009083770 A1 WO2009083770 A1 WO 2009083770A1 IB 2008003457 W IB2008003457 W IB 2008003457W WO 2009083770 A1 WO2009083770 A1 WO 2009083770A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- bending
- angle
- theoretical
- machine
- 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
Definitions
- the present invention refers to a method for bending pipes.
- the present invention regards a method for bending pipes in a numerical control machine for bending pipes .
- the method according to the present invention can be applied to all operations providing for the transformation of a manufactured product through bending (rods, sheets, bars etc..) .
- the pipe bending machines are used according to a "step-by-step” method i.e.: after having set the pipe bending machine according to the data indicated in the drawing defining the grooving parameters, the operator manufactures the first piece and controls the results .
- the Applicant understood that the bending errors were usually due to the structural modifications to which the pipe is subjected in the rectilinear zone in immediate proximity to the bent zone, which remains rectilinear for a portion which, according to the project theoretical data, on the contrary should be already bent.
- the solution consists in correct positioning of the pipe taking into account such structural modifications upstream (hence before performing the bending) calculating such movement backwards and positioning and thus bending the pipe in a correct manner .
- An aspect of the present invention regards a method for bending pipes or similar elongated elements according to the attached claim 1.
- figure 1 illustrates a project drawing of a pipe
- figure 2 represents a pipe during the bending step on a roller of a pipe bending machine
- figure 3 illustrates a chart of the parameters calculated according to the present invention.
- a pipe bending machine comprises a seat for positioning the pipe T, a roller R around which it is bent and appropriated means for seizing and moving the pipe itself. From such seat, the seizure means see to picking the pipe and the movement means see to rotating the pipe, axially moving in a longitudinal direction and arranging the pipe itself around the roller.
- the bending parameters to be set in the pipe manufacturing machine are substantially three: bending angle around the roller (bending rotation) , distance between a curve and the subsequent one (axial forward movement) , degrees of rotation around the axis of the pipe (axial rotation) .
- the axial forward movement serves to position the pipe at the bend starting point.
- the axial rotation serves to impart the correct orientation on the bending plane to the pipe.
- the bending rotation serves to set the correct angle for bending the pipe .
- An electronic processing unit for example a PLC or a microprocessor card
- the method according to the present invention can be advantageously applied to metal pipes (such as for example titanium) used for example in aircraft hydraulic systems.
- the present invention is however applicable to all elongated elements (pipes as well as other similar elements such as for example rods, sections, drawn products etc..) which require bending according to such preset drawing.
- figure 1 shown in figure 1 is an example of such preset drawing, illustrated in which is the pipe highlighted in which are some critical points, identified by letters, in proximity to the bending (nodal points) .
- the processing programme stored in the pipe bending machine is capable of transforming the data present in the preset drawing of the pipe (which is in turn stored in a data base associable to the machine processing unit) into such bending parameters .
- the calculation of such parameters in the methodaccording to the present invention provides for that in a preliminary step with respect to the actual start of the pipe bending steps, at least one pair of calibration bendings be performed with a test pipe having the same diameter as the pipe to be manufactured, in such a manner to be able to calculate two fundamental coefficients adapted to subsequently determine the correct bending parameters in the pipe bending machine.
- a first bending of a theoretical angle ATI in the illustrated example of 120°
- actually, the pipe - due to the elastoplastic behaviour of the material - is subjected to an actual bending angle ARl smaller than the theoretical bending angle.
- the actual bending is calculated (manually or by means of such sensors) to be of 105.98.
- performed is a second bending of a theoretical angle AT2 (in the illustrated example of 30°) ; actually the pipe - due to the elastoplastic behaviour of the material - is subjected to an actual bending angle AR2 smaller than the theoretical angle.
- the actual bending is calculated to be of 21.50°.
- Such calibration measurements are preferably performed starting from different theoretical bending angles and preferably one smaller and one greater than 90°, in such a manner to simulate a bending of an acute and an obtuse angle.
- proportional springback is used to indicate the value of the angle to be added to each degree of theoretical angle set to obtain the desired bending of the pipe.
- proportional springback RP is obtained from the following formula:
- RP ((AT1-AT2) - (AR1-AR2)) / (AR1-AR2).
- RF AT - AR(I + RP) ; where AT represents a set theoretical angle and AR represents a measured actual angle resulting on the pipe upon setting such theoretical angle on the pipe bending machine .
- AT represents a set theoretical angle
- AR represents a measured actual angle resulting on the pipe upon setting such theoretical angle on the pipe bending machine .
- a parameter required to manufacture a pipe having at least a rectilinear section between two curves is the length of the rectilinear section itself.
- the theoretical length between the two curves X can be obtained from the drawing (like the one illustrated for exemplifying purposes in figure 1) .
- the Applicant understood that, if set directly in the pipe bending machine without taking into account the behaviour of the pipe during the forming, such theoretical ' length X would lead, as a consequence, to poorly performed operations and the result would not be as desired, i.e.
- the radius of curvature of the pipe depends on the radius of the roller RR on which the curve is formed and on the proportional springback and in particular the bending radius of the pipe is calculated as follows:
- the radius of curvature of the pipe and of the fixed springback RF which are the parameters conditioning the proper axial forward movement of the pipe to position the pipe at the point of starting the subsequent bending.
- the circular arc can be approximated to a rectilinear section in that upon terminating bending the pipe such circular arc - due to the elasticity effect - returns rectilinear and becomes an integral part of the rectilinear portion between the two curves.
- Such section is determined by the angle corresponding to the fixed springback RF on the circumference CI whose radius is the radius RR of the roller on which the pipe is curved and represents such factor (backward movement Y) to be further subtracted from the forward movement or theoretical distance or rectilinear section X between two curves. Consequently, once the radius of curvature has been obtained, it is obtained that the backward movement corresponds to:
- the method according to the present invention provides for that the following steps be performed in sequence:
- RP proportional springback
- the term "pipe having the same characteristics" is used to indicate that the test pipe has the same diameter, thickness and material as the pipe to be bent . Subsequently, once the first bending has been performed - in cases where provided for in the drawing project of the pipe are more curvatures in succession - it is necessary to calculate the rectilinear section between two subsequent curves in such a manner to move the pipe, through such movement means of the machine, by the correct distance forward movement.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0819269A BRPI0819269A2 (en) | 2008-01-02 | 2008-12-02 | pipe bending method |
EP08868169A EP2225056A1 (en) | 2008-01-02 | 2008-12-02 | Method for bending pipes |
CA2711383A CA2711383A1 (en) | 2008-01-02 | 2008-12-02 | Method for bending pipes |
US12/811,494 US20100281942A1 (en) | 2008-01-02 | 2008-12-02 | Method for bending pipes |
JP2010541108A JP2011508674A (en) | 2008-01-02 | 2008-12-02 | How to bend a pipe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2008A000005 | 2008-01-02 | ||
IT000005A ITMI20080005A1 (en) | 2008-01-02 | 2008-01-02 | PROCEDURE FOR BENDING TUBES |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009083770A1 true WO2009083770A1 (en) | 2009-07-09 |
WO2009083770A8 WO2009083770A8 (en) | 2009-11-26 |
Family
ID=40290038
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2008/003457 WO2009083770A1 (en) | 2008-01-02 | 2008-12-02 | Method for bending pipes |
Country Status (8)
Country | Link |
---|---|
US (1) | US20100281942A1 (en) |
EP (1) | EP2225056A1 (en) |
JP (1) | JP2011508674A (en) |
BR (1) | BRPI0819269A2 (en) |
CA (1) | CA2711383A1 (en) |
IT (1) | ITMI20080005A1 (en) |
RU (1) | RU2010123045A (en) |
WO (1) | WO2009083770A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102601186A (en) * | 2012-03-21 | 2012-07-25 | 西北工业大学 | Precision control method of springback radius and springback angle for numerical control forming of bent pipe |
WO2016177582A1 (en) * | 2015-05-06 | 2016-11-10 | Wafios Aktiengesellschaft | Method for producing formed parts and forming machine for carrying out the method |
CN111167900A (en) * | 2019-12-30 | 2020-05-19 | 上海数设科技有限公司 | Method and device for determining parameters of elbow pipe machining process |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103995927B (en) * | 2006-08-31 | 2017-01-04 | 新日铁住金株式会社 | Resilience countermeasure position specifying method and resilience countermeasure position specific device |
CN103272901B (en) * | 2013-06-17 | 2016-04-20 | 沈阳飞机工业(集团)有限公司 | A kind of conduit full pattern gets method processed |
JP5779827B1 (en) | 2014-08-05 | 2015-09-16 | 福井県 | Roll bending method and processing apparatus |
JP2023044532A (en) | 2021-09-17 | 2023-03-30 | 学校法人同志社 | Spring back quantity prediction method and deformed reinforcing bar bending method |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3812694A (en) * | 1970-11-30 | 1974-05-28 | P Peddinghaus | Bending machine for metal rods |
US3821525A (en) * | 1972-03-16 | 1974-06-28 | Conrac Corp | Method and apparatus for automatically compensated tube bending |
DE3900990A1 (en) * | 1989-01-12 | 1990-08-02 | Bundy Gmbh | Method for computer-supported mapping of the layout of, and device for manufacturing spatially bent, small-calibre pipelines, in particular fuel lines or brake lines in the car industry |
DE4312556A1 (en) * | 1993-04-17 | 1994-10-20 | Deutsche Aerospace Airbus | Method for bending |
DE4436442A1 (en) * | 1994-10-13 | 1996-04-18 | Daimler Benz Aerospace Airbus | Method of precise bending pipes and tubes for aerospace industry |
-
2008
- 2008-01-02 IT IT000005A patent/ITMI20080005A1/en unknown
- 2008-12-02 BR BRPI0819269A patent/BRPI0819269A2/en not_active IP Right Cessation
- 2008-12-02 WO PCT/IB2008/003457 patent/WO2009083770A1/en active Application Filing
- 2008-12-02 CA CA2711383A patent/CA2711383A1/en not_active Abandoned
- 2008-12-02 EP EP08868169A patent/EP2225056A1/en not_active Withdrawn
- 2008-12-02 JP JP2010541108A patent/JP2011508674A/en active Pending
- 2008-12-02 US US12/811,494 patent/US20100281942A1/en not_active Abandoned
- 2008-12-02 RU RU2010123045/02A patent/RU2010123045A/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3812694A (en) * | 1970-11-30 | 1974-05-28 | P Peddinghaus | Bending machine for metal rods |
US3821525A (en) * | 1972-03-16 | 1974-06-28 | Conrac Corp | Method and apparatus for automatically compensated tube bending |
DE3900990A1 (en) * | 1989-01-12 | 1990-08-02 | Bundy Gmbh | Method for computer-supported mapping of the layout of, and device for manufacturing spatially bent, small-calibre pipelines, in particular fuel lines or brake lines in the car industry |
DE4312556A1 (en) * | 1993-04-17 | 1994-10-20 | Deutsche Aerospace Airbus | Method for bending |
DE4436442A1 (en) * | 1994-10-13 | 1996-04-18 | Daimler Benz Aerospace Airbus | Method of precise bending pipes and tubes for aerospace industry |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102601186A (en) * | 2012-03-21 | 2012-07-25 | 西北工业大学 | Precision control method of springback radius and springback angle for numerical control forming of bent pipe |
WO2016177582A1 (en) * | 2015-05-06 | 2016-11-10 | Wafios Aktiengesellschaft | Method for producing formed parts and forming machine for carrying out the method |
CN111167900A (en) * | 2019-12-30 | 2020-05-19 | 上海数设科技有限公司 | Method and device for determining parameters of elbow pipe machining process |
Also Published As
Publication number | Publication date |
---|---|
WO2009083770A8 (en) | 2009-11-26 |
EP2225056A1 (en) | 2010-09-08 |
ITMI20080005A1 (en) | 2009-07-03 |
US20100281942A1 (en) | 2010-11-11 |
CA2711383A1 (en) | 2009-07-09 |
JP2011508674A (en) | 2011-03-17 |
BRPI0819269A2 (en) | 2019-09-24 |
RU2010123045A (en) | 2012-02-10 |
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