EP0406969B1 - Method, apparatus and bending mandrel for bending a multiple tube - Google Patents

Method, apparatus and bending mandrel for bending a multiple tube Download PDF

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Publication number
EP0406969B1
EP0406969B1 EP90201759A EP90201759A EP0406969B1 EP 0406969 B1 EP0406969 B1 EP 0406969B1 EP 90201759 A EP90201759 A EP 90201759A EP 90201759 A EP90201759 A EP 90201759A EP 0406969 B1 EP0406969 B1 EP 0406969B1
Authority
EP
European Patent Office
Prior art keywords
bending
tube
mandrels
mandrel
location
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.)
Expired - Lifetime
Application number
EP90201759A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0406969A1 (en
Inventor
H.G. Grobbenhaar
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.)
Grand Prix Silencers
Original Assignee
Grand Prix Silencers
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Filing date
Publication date
Application filed by Grand Prix Silencers filed Critical Grand Prix Silencers
Publication of EP0406969A1 publication Critical patent/EP0406969A1/en
Application granted granted Critical
Publication of EP0406969B1 publication Critical patent/EP0406969B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D9/05—Bending tubes using mandrels or the like co-operating with forming members
    • B21D9/07—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only
    • B21D9/073—Bending tubes using mandrels or the like co-operating with forming members with one or more swinging forming members engaging tube ends only with one swinging forming member

Definitions

  • a multiple tube means in this description and claims a tube which comprises a plurality of conduits, herein called compartments, joined together into the integral tube and extending longitudinally along the tube.
  • the compartments are typically separated from each other by one or more partition walls.
  • the partition wall may be a double wall, in which case each compartment is then a complete single tube in itself, or the partition wall may be a common wall between two compartments.
  • such a tube is of metal, e.g. steel.
  • a known multiple tube is a so-called DD-tube which comprises two compartments, each with a D-shaped cross-section, joined to each other with the flat parts facing each other.
  • the section of the DD-tube may be circular, elliptical or another shape.
  • the partition wall between them is a common wall.
  • DD-tube is usually manufactured as straight tube with two compartments and then modified by, among other steps, a bending operation into the required shape of, for example, an exhaust pipe.
  • a method is known in actual practice in which DD-tube is bent in a bending plane transverse to the partition between the two D-shaped compartments.
  • a bending mandrel is inserted into each of the D-shaped compartments.
  • each bending mandrel has an outer sleeve extending with an essentially constant cross-section transverse to the longitudinal axis, this cross-section corresponds to the cross-section of the D-shaped compartment.
  • the bending mandrel has a flat front side on the end facing towards the bend; the transition area between the outer sleeve and the flat front side is slightly rounded off.
  • a circular bending template is used. The tube is bent round the template.
  • Each bending mandrel is inserted far enough into the tube so that the foremost boundary of the outer sleeve of the mandrel lies approximately 2-5 mm in front of the radius through the tangent point of the tube with the bending template.
  • the correct position of each of the bending mandrel is is determined by experiment for each tube size, bending radius etc. and is thereafter not again altered. If the bending mandrel is inserted further into the tube than the above mentioned position, then a bulge occurs in the bend formed which is an impression of the said transition area.
  • Another disadvantage of the known method occurs when it is attempted to bend the DD-tube in two opposing bends in the same bending plane, i.e. when forming an S-shaped bend. Because the position of the bending mandrel at the inside of the bend may be different from the position of the bending mandrel at the outside of the bend, when making an S-shaped bend, the bending mandrels have to be moved from one compartment to the other during the bending operation. This results in lost production time.
  • DE-A-2 732 046 relates to a method for bending two pipes, one inserted inside the other, and to an apparatus for carrying out the method.
  • two mandrels are used, a round mandrel inserted inside the smaller pipe, and a crescent shaped mandrel between the smaller and the larger pipe. Both mandrels are connected to a support via rigid rods and are kept at their locations while bending the pipes.
  • the position of the bending mandrel in each compartment is varied during the bending operation, to depend e.g. on the bending radius. Therefore an S-bend may be made just by changing the position of the bending mandrel and it is not necessary to remove the bending mandrels collectively from the multiple tube and then re-insert the bending mandrels collectively into another position in the multiple tube.
  • the speed at which the method in accordance with the invention may be operated is consequently increased.
  • the mandrel locating means is adapted to apply a resilient force to at least one of the relatively displaceable mandrels, thereby permitting its displacement in the longitudinal direction of said tube.
  • an elastically extensible element connects at least one of said relatively displaceable mandrels to a fixed element (e.g. a frame part).
  • the elastically extensible element may be a metal tension rod.
  • the elastically extensible element allows a displacement of the bending mandrel longitudinally, whereby the position of each bending mandrel which is provided with such a component is determined by equilibrium between the spring force of the element and the force which is exerted on the bending mandrel by the walls of the respective compartment.
  • the bending mandrels are displaceable longitudinally along the tube, the bending mandrels do not have to be pulled out of the tube for transfer from one bending plane to another bending plane transverse to it, but it is sufficient to rotate the tube by 90° around the longitudinal direction of the tube.
  • the apparatus makes it possible to bend the tube in any desired plane relative to the partition wall.
  • a bending mandrel 12 extends into D-tube 8; a bending mandrel 13 extends into D-tube 9.
  • the mandrels are located at the bending location.
  • Each of the bending mandrels 12 and 13 comprises a bending body 14 and a bending head 15.
  • the bending mandrels 12 and 13 are, by means of steel tension rods 16 and 17 respectively, joined hingedly to a rocker arm 18, which in turn is hingedly joined with the frame 19 of the apparatus, not shown in detail.
  • the tension rods 16 and 17 form elastically extensible elements which apply resilient constraint to the mandrels 12,13 to ensure position adjustment of each of the bending mandrels to the bending parameters occurring in each of the two compartments.
  • Fig. 3 shows another embodiment of a bending mandrel useful in the invention.
  • the bending body is again indicated by 14 and the bending head is indicated by 15. Two identical bending mandrels are used.
  • the bending body has a constant cross-section along its length which essentially corresponds with the section of the compartment to be bent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Jigs For Machine Tools (AREA)
EP90201759A 1989-07-05 1990-07-02 Method, apparatus and bending mandrel for bending a multiple tube Expired - Lifetime EP0406969B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8901713 1989-07-05
NL8901713A NL8901713A (nl) 1989-07-05 1989-07-05 Werkwijze, inrichting en buigdoorn voor het buigen van een meervoudige buis.

Publications (2)

Publication Number Publication Date
EP0406969A1 EP0406969A1 (en) 1991-01-09
EP0406969B1 true EP0406969B1 (en) 1994-08-31

Family

ID=19854969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90201759A Expired - Lifetime EP0406969B1 (en) 1989-07-05 1990-07-02 Method, apparatus and bending mandrel for bending a multiple tube

Country Status (11)

Country Link
EP (1) EP0406969B1 (pl)
JP (2) JP2566049B2 (pl)
AT (1) ATE110601T1 (pl)
CZ (1) CZ284109B6 (pl)
DD (1) DD296865A5 (pl)
DE (1) DE69012002T2 (pl)
ES (1) ES2057358T3 (pl)
NL (1) NL8901713A (pl)
PL (1) PL164158B1 (pl)
PT (1) PT94606B (pl)
SK (1) SK279558B6 (pl)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1547702B1 (en) 2003-12-26 2007-07-11 Calsonic Kansei Corporation Apparatus and method for bending multi-channel tubes
JP4751049B2 (ja) * 2003-12-26 2011-08-17 カルソニックカンセイ株式会社 多穴管の曲げ部製造装置及び曲げ部製造方法。
DE102006025746A1 (de) * 2006-05-31 2007-12-06 Klingelnberg Ag Dornschaft-Wechselbiege-Werkzeug
DE102014102974A1 (de) 2014-03-06 2015-09-10 Thyssenkrupp Steel Europe Ag Verfahren zur individualisierten Anpassung der Form von Bauteilen
CN105195622A (zh) * 2015-10-26 2015-12-30 浙江志达管业有限公司 管制弯头冲压成型模具
CN111702053A (zh) * 2020-07-02 2020-09-25 昆山联德电子科技有限公司 圆形薄壁管材小r角折弯方法及其对应的装置
KR102808813B1 (ko) * 2022-07-05 2025-05-19 (주)일지테크 이형 비대칭 관체의 절곡을 위한 다중코어를 구비한 벤딩기구

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009601A (en) * 1975-01-24 1977-03-01 K.K. Shimizu Seisakusho Method of and apparatus for bending a double pipe
DE2732046A1 (de) * 1976-08-20 1979-02-01 Schwarze Rigobert Verfahren zum biegen zweier ineinander gesteckter rohre und vorrichtung zur durchfuehrung des verfahrens
JPS60118331A (ja) * 1983-12-01 1985-06-25 Mitsubishi Heavy Ind Ltd 二重管熱交換器の製造方法
DE3415077C1 (de) * 1984-04-21 1985-09-05 Schmitz & Brill GmbH & Co. KG, 5950 Finnentrop Verfahren zum Herstellen von doppelwandigen,gekruemmten Rohrabschnitten fuer Abgasanlagen an Kraftfahrzeugen od.dgl. und Werkzeug zur Durchfuehrung des Verfahrens
JPS61195813A (ja) * 1985-02-26 1986-08-30 Toyo Tire & Rubber Co Ltd 減圧充填スラツシユ成形法

Also Published As

Publication number Publication date
JPH0342122A (ja) 1991-02-22
CS335090A3 (en) 1992-02-19
DD296865A5 (de) 1991-12-19
DE69012002D1 (de) 1994-10-06
PT94606B (pt) 1997-09-30
PL285944A1 (en) 1991-02-25
JPH07148530A (ja) 1995-06-13
ES2057358T3 (es) 1994-10-16
PT94606A (pt) 1992-01-31
SK279558B6 (sk) 1998-12-02
ATE110601T1 (de) 1994-09-15
CZ284109B6 (cs) 1998-08-12
PL164158B1 (pl) 1994-06-30
DE69012002T2 (de) 1995-01-05
EP0406969A1 (en) 1991-01-09
NL8901713A (nl) 1991-02-01
JP2566049B2 (ja) 1996-12-25

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