EP2266721A2 - Mandrin doté de moyens d'alignement - Google Patents

Mandrin doté de moyens d'alignement Download PDF

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Publication number
EP2266721A2
EP2266721A2 EP10166191A EP10166191A EP2266721A2 EP 2266721 A2 EP2266721 A2 EP 2266721A2 EP 10166191 A EP10166191 A EP 10166191A EP 10166191 A EP10166191 A EP 10166191A EP 2266721 A2 EP2266721 A2 EP 2266721A2
Authority
EP
European Patent Office
Prior art keywords
bending
support body
bending mandrel
cylindrical ring
mandrel
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Withdrawn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
EP10166191A
Other languages
German (de)
English (en)
Other versions
EP2266721A3 (fr
Inventor
Thomas Flehmig
Martin Kibben
Oliver Mertens
Thomas Neuhausmann
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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 ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP2266721A2 publication Critical patent/EP2266721A2/fr
Publication of EP2266721A3 publication Critical patent/EP2266721A3/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Withdrawn legal-status Critical Current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

  • the invention relates to a bending mandrel for bending closed hollow profiles with a shank having an axial end face and at least one support body, the support body has at least one axial end face and is connected to the shaft and / or other support bodies via a hinged connection, wherein the connection a connection element extending in the axial direction of the bending mandrel is provided.
  • Bending mandrels are used to bend hollow sections to prevent sink marks, wrinkling and cross-sectional area change when bending a hollow section.
  • a bending mandrel is usually made of a solid shaft and supporting bodies, wherein the supporting bodies have a cross-sectional area corresponding to the later cross-sectional area of the tube or the hollow profile. Bending mandrels are preferably used for bending pipes.
  • the diameters of the tubes can be up to 150 mm or larger. Before bending, insert the mandrel into the hollow section. In this case, there is the problem that the relatively movably arranged support body have been kept in position only in the connecting element via a spring catch.
  • the above-described object is achieved in that between the support bodies and / or between a support body and the shaft means are provided for aligning the bending mandrel, which are formed from at least one elastic body and the elastic body a force due to an elastic deformation on the axial end faces of the support body and / or the shaft exerts, so that the support body of the bending mandrel occupy a rectilinear position before the bending operation.
  • ball discs are provided as support body.
  • cylindrical tubes can be bent with the mandrel, the lateral surfaces of the spherical discs as support surfaces during the bending process help particularly avoid sink marks.
  • a bending of the reshaped hollow profile in any direction is achieved according to a further embodiment of the bending mandrel according to the invention characterized in that the connecting element has at one of its ends a spherical condyle.
  • the support body can then be tilted against each other in any direction, so that the bending process is particularly flexible.
  • a force can be exerted in a simple manner on the end faces of the support body or of the shaft, so that tilting of the support body is avoided before the threading of the bending mandrel.
  • the outer diameter of the cylindrical ring for example when using spherical disks as a support body, smaller than the outer dimensions of the support body or the spherical disks or the shaft. This ensures that the bending of the hollow profile is not hindered by the cylindrical ring in a particularly simple manner.
  • the material for the cylindrical ring is in particular an elastomer in question, ie an elastically deformable plastic.
  • radially extending relief holes are provided in the cylindrical ring.
  • bending pipes serve the radially extending Relief bores to adjust the forces acting on the end faces in a simple manner in the circumferential direction of the cylindrical ring to a uniform value.
  • a slightly harder elastomer can be selected for the cylindrical ring, provided that each spherical disk and / or the shaft has a circumferential recess for receiving material of the cylindrical ring. It is expected that the selection of a harder elastomer will further improve the wear characteristics of the cylindrical ring.
  • the material of the cylindrical ring can be pressed into these recesses, so that it is achieved that the bending operation is influenced only insignificantly by the cylindrical ring.
  • spring rods and / or helical springs are provided as means for aligning the bending mandrel, which are arranged on the axial end faces of the support body and / or the shaft, preferably radially symmetrical and each connect opposite axial end faces of the support body and / or the shaft .
  • Spring rods and coil springs can be bent in a flexible manner and are able to align the support body of the mandrel both as well as in a necessary bending of the mandrel in the hollow profile tilting the support body against each other not or only marginally hinder.
  • these can, for example, the tilting and bending of the mandrel in a Determine preferred direction.
  • Coil springs are extremely flexible and offer the possibility of allowing bending of the mandrel in any direction and at the same time allow alignment of heavy support body.
  • disc springs are provided as a means for aligning the bending mandrel, wherein the support body and / or the shaft has an annular groove at least in an end face for receiving and fixing the disc springs.
  • Disc springs have the advantage that they require a particularly small installation space, the spring core is adjustable by its geometry and a combination with other single-plate springs for adjusting the spring force is possible. In addition, disc springs usually have a long life.
  • Fig. 1 shows first in a perspective view a bending mandrel 1 according to the invention, which has a shaft 2 and three support bodies 3, 4, 5 formed as spherical disks. Between the end face 2a of the shaft 2 and the spherical disc 3, an elastic body in the form of a cylindrical ring 6 is provided, which is used for aligning the bending mandrel before the actual bending operation. As can be seen, the cylindrical ring 6 is provided both between spherical disks 3, 4 and 5 and between the spherical disk 3 and the shaft 2.
  • the cylindrical, elastic ring 6 exerts on the end faces 2a, 3a, 4a and on the end faces of the spherical disc 3, 4 and 5, not shown, a force due to an elastic deformation of the cylindrical ring 6. Due to the force exerted by the cylindrical ring 6 on the shaft and, for example, on the spherical disk 3, the spherical disk 3 is aligned relative to the shaft 2 in a straight-line position. A movement of the spherical disc 3 against the deformation forces of the elastic body 6 only occurs in the case of bending a hollow profile.
  • the cylindrical ring 6 When loading the hollow profile with the bending mandrel, the cylindrical ring 6 thus ensures that the movably arranged and by means of the connecting element 7 respectively connected spherical disks 3, 4, 5 take a straight-line position.
  • the position of the support body 3, 4, 5 must not only be straight, but may also give a fixed predetermined curvature of the mandrel.
  • the cylindrical ring 6 would have to be designed accordingly, for example be flattened on one side.
  • a spring detent not shown may be provided in the ball joint 10, which can engage the ball joint in a preferred direction to align even heavier support body or to facilitate the positioning of such support body before the bending process.
  • each spherical disk 3, 4, 5 is now a cylindrical ring 6 of elastic material is provided, which in the case of bending of the bending mandrel in the recess 8, which each ball disc 3, 4, 5, is moved in. As a result, bending of the mandrel 1 is further facilitated.
  • 6 relief holes 9 can be seen on the cylindrical ring, which extend radially symmetrically.
  • Fig. 2 shows in a perspective view of the cylindrical ring 6 with its radially symmetrical relief holes 9.
  • the radially symmetrical relief holes 9 cause over the entire circumference of the elastic ring 6, the restoring forces, ie the Forces that occur in an elastic deformation, changed and specific for each bending mandrel, for example, depending on the weight of the support body 3, 4, 5 can be adjusted. But there are also other recesses conceivable to change the restoring forces in specific areas of the cylindrical ring 6.
  • FIG. 3 to Fig. 6 show now different embodiments of the bending mandrel according to the invention in a schematic sectional view, each of these embodiments has other means for aligning the bending mandrel.
  • the ball joint 10 of the connecting element 7 is not shown.
  • the bending mandrel according to the invention has an annular bead 11 for aligning the spherical disks or the shaft with the spherical disks 3 and 4, which consists of an elastic material, for example an elastomer, in particular a rubber.
  • the bead 11 exerts a force on the spherical disk 3, for example, due to its elastic deformation and aligns the spherical disk parallel to the spherical disk 4.
  • the bead 11 is reshaped to such an extent that no negative influence on the bending process takes place when using the bending mandrel 1.
  • a circumferential bead 11 may also be provided an interrupted bead, the bead 11 is then preferably constructed radially symmetrically or interrupted in order to stabilize the mandrel in a straight-line position.
  • Fig. 4 illustrated embodiment of the bending mandrel spring rods 12 according to the invention, which are fixed to the end faces of the respective spherical disks 3, 4.
  • the attachment of the spring rods 12 to the respective spherical discs 3, 4 is in Fig. 4 not shown in detail.
  • Fig. 5 now shows schematically a coil spring 13, which are used to align the spherical discs 3, 4.
  • the spherical discs 3, 4 have in this embodiment grooves 14 for receiving the coil spring 13.
  • the grooves 14 are preferably annular in the spherical discs 3, 4 introduced.
  • FIG. 6 Another embodiment of the bending mandrel according to the invention shows Fig. 6 , To align the spherical discs 3, 4 cup springs 15 are used, which are secured in a groove 14 on a spherical disk.
  • All illustrated embodiments ensure on the one hand a secure alignment of the spherical discs 3, 4 and at the same time sufficient bending capacity of the mandrel during the forming of the hollow profiles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP10166191.6A 2009-06-17 2010-06-16 Mandrin doté de moyens d'alignement Withdrawn EP2266721A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009025985A DE102009025985B4 (de) 2009-06-17 2009-06-17 Biegedorn mit Ausrichtemitteln

Publications (2)

Publication Number Publication Date
EP2266721A2 true EP2266721A2 (fr) 2010-12-29
EP2266721A3 EP2266721A3 (fr) 2013-05-01

Family

ID=42931914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10166191.6A Withdrawn EP2266721A3 (fr) 2009-06-17 2010-06-16 Mandrin doté de moyens d'alignement

Country Status (2)

Country Link
EP (1) EP2266721A3 (fr)
DE (1) DE102009025985B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109990682A (zh) * 2019-05-06 2019-07-09 广西玉柴机器股份有限公司 一种测量气门座圈径向跳动的方法以及辅助工装

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014102974A1 (de) 2014-03-06 2015-09-10 Thyssenkrupp Steel Europe Ag Verfahren zur individualisierten Anpassung der Form von Bauteilen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475375A (en) 1983-01-24 1984-10-09 Hill Ernest W Multi-flex tube bending mandrel

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2962077A (en) * 1958-11-18 1960-11-29 Boeing Co Pipe bending mandrel
US4744233A (en) * 1986-07-14 1988-05-17 Ap Industries, Inc. Apparatus for bending rectangular tubes
JP3385061B2 (ja) * 1993-04-23 2003-03-10 昭和電工株式会社 曲げ加工用マンドレル及び曲げ加工方法
JPH0899127A (ja) * 1994-09-30 1996-04-16 Showa Alum Corp 曲げ加工用マンドレル
JPH08174082A (ja) * 1994-12-27 1996-07-09 Kinugawa Rubber Ind Co Ltd 曲げ加工用芯材
JPH11179437A (ja) * 1997-12-24 1999-07-06 Nippon Light Metal Co Ltd 曲げ加工用マンドレルと押し通し曲げ加工法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475375A (en) 1983-01-24 1984-10-09 Hill Ernest W Multi-flex tube bending mandrel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109990682A (zh) * 2019-05-06 2019-07-09 广西玉柴机器股份有限公司 一种测量气门座圈径向跳动的方法以及辅助工装
CN109990682B (zh) * 2019-05-06 2024-02-09 广西玉柴机器股份有限公司 一种测量气门座圈径向跳动的方法以及辅助工装

Also Published As

Publication number Publication date
DE102009025985A1 (de) 2010-12-30
EP2266721A3 (fr) 2013-05-01
DE102009025985B4 (de) 2013-03-28

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