EP1488867A1 - Mandrin à cintrer - Google Patents

Mandrin à cintrer Download PDF

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Publication number
EP1488867A1
EP1488867A1 EP04014189A EP04014189A EP1488867A1 EP 1488867 A1 EP1488867 A1 EP 1488867A1 EP 04014189 A EP04014189 A EP 04014189A EP 04014189 A EP04014189 A EP 04014189A EP 1488867 A1 EP1488867 A1 EP 1488867A1
Authority
EP
European Patent Office
Prior art keywords
bending
plug
plugs
mandrel
spherical
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.)
Withdrawn
Application number
EP04014189A
Other languages
German (de)
English (en)
Inventor
Teruaki c/o Kabushiki Kaisha Opton Yogo
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.)
Opton Co Ltd
Original Assignee
Opton 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 Opton Co Ltd filed Critical Opton Co Ltd
Publication of EP1488867A1 publication Critical patent/EP1488867A1/fr
Withdrawn legal-status Critical Current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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
    • B21D9/03—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length and built-up from loose elements, e.g. series of balls

Definitions

  • This invention relates to a mandrel for bending which inhibits formation of irregularities at a bending part of a pipe during the bending process.
  • Unexamined Japanese Utility Model Publication No. 6-41921 and Unexamined Japanese Patent Publication No. 7-290156 disclose a known conventional mandrel for bending comprising a plurality of plugs coupled in series onto an end of a shank.
  • the outer peripheral surface of each plug 50 is formed to be spherical and a connection shaft 52 is inserted through the center of the plug 50.
  • the connection shaft 52 is provided with a spherical part 54 at one end and a spherical depression 56 at the other end.
  • connection shaft 52 The spherical part 54 of the connection shaft 52 is fitted into the spherical depression 56 of another connection shaft 52, which thus constitutes an adjustable joint. In this manner, a plurality of plugs 50 are connected in series.
  • shank 58 is provided with a spherical depression 60 which is identical to the spherical depression 56.
  • the spherical part 54 of the terminal connection shaft 52 is fitted into the depression 60 so that all the plugs 50 are connected to the shank 58.
  • the plugs 50 When bending is performed, the plugs 50 are inserted into a pipe 62 to be arranged at the bending part. While the bending is performed, the spherical parts 54 rotate within the spherical depressions 56, 60 and the plugs 50 are waggled along the bending direction. As a result, spaces between the respective plugs 50 are narrowed and the outer peripheral surfaces of the plugs 50 are abutted to the inner wall of the pipe 62 in a concentrated manner on the inside of the bend. Thus, formation of irregularities, such as wrinkles, on the inside of the bend is inhibited.
  • connection shaft 52 In the case of bending using the conventional mandrel as above, it is necessary to create the spherical part 54 at one end and the spherical depression 56 at the other end of the connection shaft 52. Such construction is complex and is not easy to produce. Moreover, the plug 50 has to be fixed to the connection shaft 52. There is a problem that sufficient rigidity may not possibly be obtained.
  • One object of the present invention is to provide a mandrel for bending having simple construction and sufficient rigidity.
  • the present invention provides a mandrel for bending which inhibits formation of irregularities of a pipe by arranging plugs at a bending part within the pipe.
  • the mandrel comprises a plurality of plugs. Each plug is provided with a spherical outer peripheral surface. A fulcrum pin is fitted through the plug. A link mechanism is rotatably attached to the fulcrum pins of neighboring plugs for connection therebetween. Each plug is provided with a depression which the adjoining plug can enter during the bending process.
  • the mandrel for bending constituted as above is simple in construction and can achieve high rigidity.
  • the plugs may be connected to a shank via the link mechanism.
  • the depressions may be formed to be spherical.
  • a pipe 1 is arranged to be brought into contact with the outer periphery of a bend die 2 which is designed to bend the pipe 1 at a desired angle.
  • a clamp die 4 is provided so that the pipe 1 is held between the bend die 2 and the clamp die 4. While the bending is performed, the bend die 2 rotates and the clamp die 4 moves around the bend die 2.
  • a pressure die 6 is also provided in line with the clamp die 4. The pressure die 6 receives bending reaction force induced while the pipe 1 is being bent.
  • a mandrel 10 for bending is inserted into the pipe 1.
  • the mandrel 10 is composed of a plurality of plugs 12 and a shank 14.
  • Each plug 12 is provided with an outer peripheral surface formed to be spherical.
  • a fulcrum pin 16 is piercingly fitted into the plug 12 through the center of the spherical outer peripheral surface of the plug 12.
  • a link mechanism including a first link member 18 and a pair of second link members 20, 22 is rotatably attached. Both the first and second link members are formed into a plate.
  • one end of the first link member 18 is rotatably attached to the fulcrum pin 16 of the plug 12 and the other end of the first link member 18 is rotatably attached to the fulcrum pin 16 of the adjoining plug 12 for connecting the two neighboring plugs 12.
  • one ends of the second link members 20, 22 are rotatably attached to the same fulcrum pin 16 to which the other end of the first link member 18 is attached.
  • the other ends of the second link members 20, 22 are rotatably attached to the fulcrum pin 16 piercing the adjoining plug 12, to which one end of another first link member 18 is rotatably attached.
  • the one ends of the second link members 20, 22 the other end of the first link member 18 is held, and between the other ends of the second link members 20, 22, the one end of the another first link member 18 are held, so that the two neighboring plugs 12 connected via the first link member 18 are coupled with another two neighboring plugs 12, connected in the same manner, via a pair of second link members 20, 22.
  • first link member 18 The other end of this another first link member 18 is rotatably attached to the fulcrum pin 16 of the further adjoining plug 12.
  • a plurality of plugs 12, that is, four in the present embodiment are connected to each other via the first link members 18 and the second link members 20, 22.
  • a fulcrum pin 24 similar to the fulcrum pin 16 is fitted through the shank 14.
  • One ends of the second link members 20, 22 which are connected to the terminal plug 12 at the other ends are rotatably attached to the shank via the fulcrum pin 24.
  • Each plug 12 is provided with a spherical depression 26 which the adjoining plug 12 can enter.
  • the spherical depression 26 is formed a little larger than the spherical outer peripheral surface of the plug 12.
  • the distance between the fulcrum pins 16 of two neighboring plugs 12 is substantially equal to or a little larger than the radius of the spherical outer peripheral surface of the plug 12.
  • the center of the spherical depression 26 and the center of the spherical outer peripheral surface of the adjoining plug 12 are almost the same.
  • the shank 14 is also provided with a spherical outer peripheral surface which is identical to the outer peripheral surface of the plug 12, on the side where there is the plug 12.
  • the diameter of the outer peripheral surface of the plug 12 is a little smaller than the internal diameter of the pipe 1 so that the plug 12 can be inserted into the pipe 1.
  • the plug 12 is formed by cutting a sphere at both ends, leaving a central portion having a thickness substantially equal to the radius of the sphere. A plurality of plugs 12 are arranged with a little space therebetween in the thickness direction.
  • a cut-off depression 28 is formed in such a manner that the plug 12, the first link member 18, and the second link members 20, 22 can together rotate on the fulcrum pin 16.
  • the cut-off depression 28 is designed to allow rotation to only one direction.
  • a pipe 1 is held between the bend die 2 and the clamp die 4.
  • the pressure die 6 is abutted to the pipe 1.
  • the mandrel 10 for bending comprising a plurality of plugs 12 is inserted into the pipe 1.
  • each plug 12 is disposed in such a manner that the side with the cut-off depression 28 faces to the inside of the bend.
  • the clamp die 4 is rotated around the bend die 2.
  • the pipe 1 is wound around the bend die 2, resulting in that the outside of the bend is stretched and the inside of the bend is compressed at the bending part of the pipe 1.
  • the plugs 12, the first link members 18, and the second link members 20, 22 together rotate on the respective fulcrum pins 16.
  • the spaces between the plugs 12 are expanded on the outside of the bend and are narrowed on the inside of the bend.
  • the outer peripheral surface of the plug 12 moves into the depression 26 of the adjoining plug 12 and the plugs 12 are closely abutted to each other so that no space is left between the neighboring plugs 12. Accordingly, even if the pipe 1 is compressed on the inside of the bend during the bending, formation of irregularities like formation of wrinkles cannot be promoted.
  • the respective plugs 12 are connected via the fulcrum pins 16, the first link members 18, and the second link members 20, 22. Therefore, the construction is simple. Even if large external force is applied to the respective plugs 12, the plugs 12 are supported by the fulcrum pins 16, the first link members 18, and the second link members 20, 22. Accordingly, the rigidity is high enough to be capable of inhibiting damages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP04014189A 2003-06-19 2004-06-17 Mandrin à cintrer Withdrawn EP1488867A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003175101A JP2005007438A (ja) 2003-06-19 2003-06-19 曲げ加工用マンドレル
JP2003175101 2003-06-19

Publications (1)

Publication Number Publication Date
EP1488867A1 true EP1488867A1 (fr) 2004-12-22

Family

ID=33410992

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04014189A Withdrawn EP1488867A1 (fr) 2003-06-19 2004-06-17 Mandrin à cintrer

Country Status (3)

Country Link
US (1) US20040255638A1 (fr)
EP (1) EP1488867A1 (fr)
JP (1) JP2005007438A (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20121137A1 (it) * 2012-06-28 2013-12-29 Crippa Spa Anima di curvatura
USD707332S1 (en) 2013-03-15 2014-06-17 S.P.M. Flow Control, Inc. Seal assembly
USD707797S1 (en) 2013-03-15 2014-06-24 S.P.M. Flow Control, Inc. Seal segment
US8870233B2 (en) 2007-07-03 2014-10-28 S.P.M. Flow Control, Inc. Swivel joint with uniform ball bearing requirements
US8978695B2 (en) 2009-04-20 2015-03-17 S.P.M. Flow Control, Inc. Flowline flapper valve
US8998168B2 (en) 2009-06-03 2015-04-07 S.P.M. Flow Control, Inc. Plug valve indicator
US9103448B2 (en) 2012-08-16 2015-08-11 S.P.M. Flow Control, Inc. Plug valve having preloaded seal segments
US9273543B2 (en) 2012-08-17 2016-03-01 S.P.M. Flow Control, Inc. Automated relief valve control system and method
US9322243B2 (en) 2012-08-17 2016-04-26 S.P.M. Flow Control, Inc. Automated relief valve control system and method
US9568138B2 (en) 2013-07-01 2017-02-14 S.P.M. Flow Control, Inc. Manifold assembly
CN108296330A (zh) * 2018-01-18 2018-07-20 浙江大学 一种用于薄壁管件弯曲成形的直径可调芯棒节和芯棒结构
CN109201806A (zh) * 2018-09-14 2019-01-15 浙江万丰金马逊科技有限公司 一种矩形管弯曲成形用齿轮链式芯棒
CN109201807A (zh) * 2018-09-14 2019-01-15 浙江万丰金马逊科技有限公司 一种圆形管弯曲成形用齿轮链式芯棒
CN110756631A (zh) * 2019-11-22 2020-02-07 保隆(安徽)汽车配件有限公司 一种用于截面周长变化弯管的弯管芯模及弯管装置
US10557576B2 (en) 2015-06-15 2020-02-11 S.P.M. Flow Control, Inc. Full-root-radius-threaded wing nut having increased wall thickness
US10677365B2 (en) 2015-09-04 2020-06-09 S.P.M. Flow Control, Inc. Pressure relief valve assembly and methods

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007185697A (ja) * 2006-01-13 2007-07-26 Nippon Steel Corp 金属管の加工方法及び加工装置
CN101367099B (zh) * 2007-08-14 2010-05-19 西北工业大学 柔性弯管芯模
US8322185B2 (en) * 2010-07-04 2012-12-04 Mahmoud Farzin Mandrel assembly for tube bending
KR101255487B1 (ko) * 2012-03-27 2013-04-16 경일대학교산학협력단 단면 대칭형 파이프 벤딩용 2중 롤러 맨드릴
KR101542683B1 (ko) 2014-01-24 2015-08-12 류성진 유니버셜 조인트를 이용한 맨드렐
KR101971604B1 (ko) * 2018-10-31 2019-04-23 주식회사 에스디이앤티 다관절 맨드릴을 구비한 엘보 성형장치
DE102019112251A1 (de) * 2019-05-10 2020-11-12 Ludwig Weber GmbH Vorrichtung zum Biegen von Hohlstrukturbauteilen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2248683A7 (en) * 1973-08-30 1975-05-16 Ind Mecca Brev Pedrazzoli Flexible tube bending support mandrel - has mutually interlocking spherical links, which prevent tube buckling
JPH07290156A (ja) * 1994-04-26 1995-11-07 Sekisui Chem Co Ltd パイプベンダの芯金

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408851A (en) * 1966-04-21 1968-11-05 Bend Rite Inc Ball mandrel
US3415107A (en) * 1966-06-15 1968-12-10 Pines Engineering Co Inc Tube bending mandrel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2248683A7 (en) * 1973-08-30 1975-05-16 Ind Mecca Brev Pedrazzoli Flexible tube bending support mandrel - has mutually interlocking spherical links, which prevent tube buckling
JPH07290156A (ja) * 1994-04-26 1995-11-07 Sekisui Chem Co Ltd パイプベンダの芯金

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 03 29 March 1996 (1996-03-29) *

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9964245B2 (en) 2007-07-03 2018-05-08 S.P.M. Flow Control, Inc. Swivel joint with uniform ball bearing requirements
US8870233B2 (en) 2007-07-03 2014-10-28 S.P.M. Flow Control, Inc. Swivel joint with uniform ball bearing requirements
US8978695B2 (en) 2009-04-20 2015-03-17 S.P.M. Flow Control, Inc. Flowline flapper valve
US8998168B2 (en) 2009-06-03 2015-04-07 S.P.M. Flow Control, Inc. Plug valve indicator
EP2679319A1 (fr) 2012-06-28 2014-01-01 Crippa S.P.A. Mandrin à cintrer
ITMI20121137A1 (it) * 2012-06-28 2013-12-29 Crippa Spa Anima di curvatura
US9638337B2 (en) 2012-08-16 2017-05-02 S.P.M. Flow Control, Inc. Plug valve having preloaded seal segments
US9103448B2 (en) 2012-08-16 2015-08-11 S.P.M. Flow Control, Inc. Plug valve having preloaded seal segments
US9857807B2 (en) 2012-08-17 2018-01-02 S.P.M. Flow Control, Inc. Automated relief valve control system and method
US9273543B2 (en) 2012-08-17 2016-03-01 S.P.M. Flow Control, Inc. Automated relief valve control system and method
US9322243B2 (en) 2012-08-17 2016-04-26 S.P.M. Flow Control, Inc. Automated relief valve control system and method
USD707797S1 (en) 2013-03-15 2014-06-24 S.P.M. Flow Control, Inc. Seal segment
USD707332S1 (en) 2013-03-15 2014-06-17 S.P.M. Flow Control, Inc. Seal assembly
USD734434S1 (en) 2013-03-15 2015-07-14 S.P.M. Flow Control, Inc. Seal assembly
US9568138B2 (en) 2013-07-01 2017-02-14 S.P.M. Flow Control, Inc. Manifold assembly
US10738928B2 (en) 2013-07-01 2020-08-11 S.P.M. Flow Control, Inc. Manifold assembly
USD873860S1 (en) 2013-07-01 2020-01-28 S.P.M. Flow Control, Inc. Mounting bracket for manifold assembly
US10557576B2 (en) 2015-06-15 2020-02-11 S.P.M. Flow Control, Inc. Full-root-radius-threaded wing nut having increased wall thickness
US11519530B2 (en) 2015-06-15 2022-12-06 Spm Oil & Gas Inc. Full-root-radius-threaded wing nut having increased wall thickness
US10677365B2 (en) 2015-09-04 2020-06-09 S.P.M. Flow Control, Inc. Pressure relief valve assembly and methods
CN108296330A (zh) * 2018-01-18 2018-07-20 浙江大学 一种用于薄壁管件弯曲成形的直径可调芯棒节和芯棒结构
CN109201807A (zh) * 2018-09-14 2019-01-15 浙江万丰金马逊科技有限公司 一种圆形管弯曲成形用齿轮链式芯棒
CN109201806A (zh) * 2018-09-14 2019-01-15 浙江万丰金马逊科技有限公司 一种矩形管弯曲成形用齿轮链式芯棒
CN110756631A (zh) * 2019-11-22 2020-02-07 保隆(安徽)汽车配件有限公司 一种用于截面周长变化弯管的弯管芯模及弯管装置
CN110756631B (zh) * 2019-11-22 2021-06-22 保隆(安徽)汽车配件有限公司 一种用于截面周长变化弯管的弯管芯模及弯管装置

Also Published As

Publication number Publication date
US20040255638A1 (en) 2004-12-23
JP2005007438A (ja) 2005-01-13

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