EP2919927A1 - Tête d'expansion pour outils d'élargissement, et outil d'expansion comprenant celle-ci - Google Patents

Tête d'expansion pour outils d'élargissement, et outil d'expansion comprenant celle-ci

Info

Publication number
EP2919927A1
EP2919927A1 EP13789486.1A EP13789486A EP2919927A1 EP 2919927 A1 EP2919927 A1 EP 2919927A1 EP 13789486 A EP13789486 A EP 13789486A EP 2919927 A1 EP2919927 A1 EP 2919927A1
Authority
EP
European Patent Office
Prior art keywords
expansion
head
jaws
expansion head
adapter element
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.)
Granted
Application number
EP13789486.1A
Other languages
German (de)
English (en)
Other versions
EP2919927B1 (fr
Inventor
Daniel Wolter
Sven Christoph
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.)
Rehau Automotive SE and Co KG
Original Assignee
Rehau AG and Co
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 Rehau AG and Co filed Critical Rehau AG and Co
Publication of EP2919927A1 publication Critical patent/EP2919927A1/fr
Application granted granted Critical
Publication of EP2919927B1 publication Critical patent/EP2919927B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/026—Enlarging by means of mandrels
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/026—Enlarging by means of mandrels
    • B21D41/028—Enlarging by means of mandrels expandable mandrels

Definitions

  • the present invention relates to an expansion head for expansion tools for hollow workpieces, in particular for the ends of pipes made of plastics and coated with plastics metals.
  • expansion heads are known for example from EP 0 044 795 A2 and DE 42 02 348 C1.
  • the expansion heads comprise individual segments, the so-called. Sp Dreckbacken whose base parts are housed together in a head housing.
  • the expansion jaws are movable in the radial direction outwards and separated from one another via parting lines.
  • Such expansion heads are attached to Aufweitwerkmaschineen and in particular connected via a screw with these.
  • the expansion tools are basically of a pressing device with a mandrel which is axially displaceable in or on the housing of the pressing device and at its one axial end portion has a conical surface, wherein the opening angle of the corresponding cone is usually about 9 °, and an expansion head, the preferably via a Consvorrich- tion for the expansion head on the pressing device can be fixed, constructed. At an opening angle of the cone of the expanding mandrel of 9 ° is called a so-called. Standard recording.
  • a drive device which can be driven manually or by machine, the mandrel is moved in the axial direction in the direction of the expansion head.
  • the expansion jaws of the expansion head define a central conical seat, in which the conical surface of the mandrel, which is displaceable in the axial direction by the pressing device, engages.
  • the pressing device Upon actuation of the pressing device, the mandrel is pressed into the expansion head, wherein there is a contact between the conical surface of the mandrel and the receptacle formed by the expanding jaws.
  • the expansion jaws Upon further axial movement of the mandrel in the direction of the expansion head, the expansion jaws are pressed radially outward and there is a radial stroke of the expansion jaws, so that the expansion jaws the ends of a hollow workpiece, in particular a plastic pipe or a metal-plastic composite pipe, into which the expansion head is inserted expand.
  • the expansion jaws go over from the closed state to the expansion state.
  • the seg- Returned by return means for example, an annular spring or an elastic O-ring
  • Expansion tool (standard mount) with corresponding axial travel only the ends of pipes with a small diameter (maximum about 26 mm outside diameter) can be widened.
  • the object of the present invention is to provide an expansion head for hollow tool widening tools which overcomes the disadvantages of the prior art.
  • the expansion head according to the invention should be suitable for expanding larger-sized tubes (in particular with an outer diameter of at least 40 mm), wherein the expansion head according to the invention should be compatible with the common expansion tools (which have a standard receptacle).
  • Expander tools for hollow workpieces in particular for the ends of pipes made of plastics and plastics-coated metals, with the features of claim 1 or by a hollow tool expansion tool according to claim 10 solved.
  • Preferred embodiments of the expansion head according to the invention are described in the claims dependent therefrom.
  • the adapter element has on its inner side a further conical surface whose opening angle is smaller than the opening angle of the conical surface formed by the conical segment surfaces on the inside of the expansion jaws.
  • the present invention resides in an expansion head for
  • Expansion tools for hollow workpieces in particular for the ends of pipes of plastics and of plastics-coated metals, comprising a head housing with a radially inwardly directed guide flange; a set of sector-shaped spreader jaws each guided individually by an inner flange sector overlapping with the guide flange and a radial groove radially movably on the guide flange, the set of spreader jaws being movable between a closed state and an expanded state, and the spreader jaws their inside are limited by conical segment surfaces, which complement each other in the closed state of the expansion head to a conical surface; and an accommodated in the head housing, conical and axially movable adapter element, wherein the cone angle of the adapter element corresponds to the opening angle ß of the conical segment surfaces and the adapter element is bounded on its inner side by a further conical surface, wherein the opening angle ⁇ of the conical surface on the inside of the adapter element smaller than the opening angle ß by the cone segment surfaces
  • the opening angle of the conical surface on the inside of the adapter element by 1 ° to 20 °, in particular 2 ° to 10 ° and preferably 4 ° to 6 ° smaller than the opening angle of the through Cone segment surfaces on the inside of the expansion jaws formed conical surface.
  • the adapter element is fixed in the head housing by an attachment means in the axial direction.
  • the expansion head further comprises at least one restoring element, which is accommodated in the head housing and on one side with the
  • Adapter element is in engagement, wherein the restoring element exerts a force acting in the axial direction on the adapter element, at least in the expansion state.
  • the provision of an internal return element causes an independent return operation of the adapter element after completion of the expansion process.
  • the use of a plate spring as a restoring element has proven to be particularly advantageous because it can be integrated well into the head housing.
  • the expansion head further comprises at least one return means by which the expansion jaws from the expansion state in the closed state are traceable.
  • a return means prevents tilting or hooking of the individual expansion jaws during the return process.
  • the return means is preferably designed as an annular sleeve or annular spring, more preferably, the return means is arranged in an annular groove formed on the outside of the expansion jaws.
  • the expansion jaws may also be helpful if the expansion jaws have a taper on their side facing away from the head housing. As a result, a smooth transition between the flared and unexpanded portions of the hollow workpiece after the flaring operation can be achieved. It may also be useful if at least one of the expansion jaws has on its outer side a sliding shoe, which cooperates with a corresponding sliding groove in the head housing. As a result, the expansion jaws are guided during the expansion process safely in the expansion head according to the invention, whereby the risk of tilting of the expansion jaws is reduced. In this context, it is particularly preferred if all expansion jaws each have on their outer side a sliding shoe, which cooperates with a respective sliding groove in the head housing. This ensures a particularly secure guidance of the expanding jaws in the expansion head according to the invention during the expansion process.
  • Figure 1 shows a plan view of an expansion head according to an embodiment of the present invention in the closed state.
  • Figure 2 shows a sectional view of the expansion head shown in Fig. 1 along the line A-A viewed in the arrow direction.
  • Figure 3 shows a plan view of the expansion head shown in Fig. 1 in the open state.
  • Figure 4 shows a sectional view of the expansion head shown in Fig. 3 along the line A-A viewed in the direction of arrow.
  • Figure 5 shows a sectional view of the expansion jaws of the expansion head shown in Fig. 4 taken along the line A-A with a view in the direction of arrow.
  • an expansion head according to an embodiment of the present invention is shown in a closed state (Figs. 1 and 2) and in an opened state (Figs. 3 to 5).
  • the expansion head 1 according to the invention comprises a head housing 2, a set of sector-shaped expanding jaws 3 and an adapter element 4.
  • the head housing 2 is constructed from a cap 5 with a radially inwardly directed guide flange 6 and an extension portion 7, wherein the cap 5 and the extension portion 7 are connected to each other via a spring wire steel 8.
  • the set of sector-shaped expansion jaws 3 in the closed state of the expansion head 1 forms a closed mold with a substantially cylindrical shape in the expansion area of the expansion head 1.
  • expansion area here refers to the area of the expansion jaws 3 which protrudes beyond the head housing 2.
  • the hollow workpiece to be flared is located in this expansion region, where it adjoins the outside of the expansion jaws 3.
  • each of the expansion jaws 4 is bounded on its inside by conical segment surfaces 9, which in the closed state of the expansion head 1 complement one another to form a conical surface
  • the set of spreading jaws 3 comprises six identical spreading jaws 3. In order to form this each spreader 3 a cone segment of 60 °.
  • Each of the sector-shaped expansion jaws 3 is guided individually on the guide flange 3 by an inner flange sector 10, which overlaps with the guide flange 6, and a radial groove 11 in the head housing 2.
  • the mecanicflanschsektoren 10 have on their outsides Nutsektoren included in the total extent of the expansion head 1 to a circumferential annular groove on the outer side mecanicflanschsektoren 10, in which an annular return means 12 for the return of the expanding jaws 4 from the open to the closed state of the expansion head 1 is.
  • the return means 12 is preferably selected so that its restoring force for the
  • the return means 12 is an O-ring 12.
  • a ring spring can be used advantageously as well.
  • the adapter element 4 has a two-part construction and is tapered on its outer side.
  • the cone is formed from a cone element 13, whose cone angle coincides with the opening angle of the cone segment surfaces 9, in the embodiment shown is therefore also 13 °.
  • the cone element 13 has a contoured inner cavity into which a push-in element 14 is inserted.
  • the outer contour of the insertion element 14 is complementary to the contour of the cavity of the cone element 13.
  • the insertion element 14 On its inside, the insertion element 14 in turn has a further conical surface 15.
  • the opening angle of the conical surface 15 in the embodiment shown is 9 °.
  • the adapter element 4 may also be formed in one piece or in several parts.
  • the embodiments of the outer cone and the inner conical surface also apply to a one-piece or multi-part design of the adapter element. 4
  • the expansion head 1 At the open side of the head housing 2 facing side of the cone element 13 is formed on this as a plate spring 16 formed return element 16 in the head housing 2.
  • the plate spring 16 exerts a force in the axial direction on the adapter element 4 in the expansion state.
  • a fastening means 17 is arranged, which is formed in the embodiment shown as pressed into the extension portion 7 mounting plate.
  • a circlip, a washer with a circlip, a threaded washer inserted into a thread 18 on the inside of the head housing 2, or a shim may be used as the fastener.
  • the fastening means 17 has a central recess through which the mandrel of the expansion tool can be guided. The fastening means 17 fixes the adapter element 4 and thereby also the set of expanding jaws 3 in the axial direction in the head housing 2.
  • the head housing 2 On its inside, the head housing 2, the thread 18, through which the expansion head 1 of the invention via complementary external thread on a
  • Expander tool can be screwed on.
  • the expansion tool is in principle a Tool with manual or electric drive, by which an expanding mandrel is driven in the axial direction.
  • the expanding mandrel has the shape of a cone with a certain cone angle, which corresponds to the opening angle of the opening angle of the conical surface 15 of the cone element 13.
  • a cone angle of the expanding mandrel of 9 ° has prevailed. Due to the movement of the expanding mandrel in the axial direction, the conical surface of the expanding mandrel cooperates with the conical surface 15 of the adapter element 4 during the expansion process. By driving the expanding mandrel in the expansion head 1, the conical surface of the expanding mandrel pushes against the conical surface 15 of the adapter element 4.
  • the expanding jaws 3 are made by disassembling (sawing) a rotationally symmetrical body with the axis B along the column 19.
  • the body has been divided into six equal segments which form the spreading jaws 3 ( Figure 1).
  • Fig. 5 shows a sectional view of the expansion jaws of the expansion head shown in Fig. 4 taken along the line A-A with a view in the direction of arrow. It can be seen that the expansion jaws 3 each have on their outer side a sliding shoe 20 which cooperates with a corresponding sliding groove 21 in the head housing 2. As a result, the expansion jacks 3 are guided securely in the expansion head 1 according to the invention during the expansion process. As a result, the risk of tilting of the spreading jaws 3 is reduced.
  • the spreader jaws 3 on its side facing away from the head housing 2, a taper 22.
  • a taper 22 By such a taper 22, a smooth transition between the expanded and unexpanded part of the hollow workpiece after the expansion process can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

L'invention concerne une tête d'expansion (1) pour outils d'élargissement pour pièces creuses, en particulier pour les extrémités de tubes en matière plastique ou en métal recouvert de matière plastique, la tête d'expansion (1) comprenant : un boîtier de tête (2) présentant une bride de guidage (6), dirigée radialement vers l'intérieur; un ensemble de mâchoires d'écartement (3), réalisées en forme de secteurs, qui sont guidées chacune, individuellement, par un secteur de bride intérieure (10), qui chevauche avec la bride de guidage (6), et une rainure radiale (11), mobile radialement sur la bride de guidage (6), l'ensemble de mâchoires d'écartement (3) étant mobile entre un état fermé et un état d'expansion, et les mâchoires d'écartement (3) étant limitées, à leur partie intérieure, par des surfaces de segments coniques (9), qui se complètent, à l'état fermé de la tête d'expansion (1), en une surface conique; et un élément adaptateur (4), de forme conique, logé dans le boîtier de tête (2), et mobile en direction axiale, l'angle au sommet du cône de l'élément adaptateur (4) correspondant à l'angle d'ouverture (β) des surfaces de segments coniques (9), et l'élément adaptateur (4) étant limité, à son côté intérieur, par une autre surface conique (15), l'angle d'ouverture (α) de la surface conique (15) étant, au côté intérieur de l'élément adaptateur (4), plus petit que l'angle d'ouverture (β) de la surface conique formé par les surfaces de segments coniques (9), au côté intérieur des mâchoires d'écartement (3). L'invention concerne en outre un outil d'élargissement pour pièces creuses, en particulier pour les extrémités de tubes en matière plastique et en métal recouvert de matière plastique, comprenant une telle tête d'expansion (1).
EP13789486.1A 2012-11-19 2013-11-07 Tête d'expansion pour outils d'élargissement, et outil d'expansion comprenant celle-ci Active EP2919927B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202012104450.1U DE202012104450U1 (de) 2012-11-19 2012-11-19 Expansionskopf für Aufweitwerkzeuge und diesen umfassendes Expansionswerkzeug
PCT/EP2013/003345 WO2014075778A1 (fr) 2012-11-19 2013-11-07 Tête d'expansion pour outils d'élargissement, et outil d'expansion comprenant celle-ci

Publications (2)

Publication Number Publication Date
EP2919927A1 true EP2919927A1 (fr) 2015-09-23
EP2919927B1 EP2919927B1 (fr) 2017-03-29

Family

ID=49578250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13789486.1A Active EP2919927B1 (fr) 2012-11-19 2013-11-07 Tête d'expansion pour outils d'élargissement, et outil d'expansion comprenant celle-ci

Country Status (6)

Country Link
EP (1) EP2919927B1 (fr)
CN (1) CN104797358B (fr)
AU (1) AU2013347256B2 (fr)
DE (1) DE202012104450U1 (fr)
RU (1) RU2636428C2 (fr)
WO (1) WO2014075778A1 (fr)

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CN104624825A (zh) * 2014-12-17 2015-05-20 南京航空航天大学 一种深海用埋弧焊直缝焊管扩径外扇形块及其表面防护方法
CN105396938A (zh) * 2015-12-02 2016-03-16 贵州安大航空锻造有限责任公司 航空发动机用高温合金安装边的局部胀形装置
US11054076B2 (en) 2016-11-04 2021-07-06 Zurn Industries, Llc Reinforcing ring with sleeve
CN106623502B (zh) * 2017-02-22 2018-11-09 马兴涛 一种波纹管管口修复工具
CN107855425A (zh) * 2017-09-13 2018-03-30 花园金波科技股份有限公司 金属波纹管配合端扩口工装
CN107716714A (zh) * 2017-09-13 2018-02-23 花园金波科技股份有限公司 金属波纹管配合端扩口用凹模组件
CN109226544A (zh) * 2017-11-14 2019-01-18 吴振明 用于制冷领域的铜管胀管器
CN111699075B (zh) * 2018-02-13 2021-08-31 Abb瑞士股份有限公司 用于分离、馈送和安装o型环的装置及方法
RU2715399C1 (ru) * 2018-11-07 2020-02-27 Федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВО "МГТУ "СТАНКИН") Приспособление для устранения отклонений от круглости заготовок труб и трубной арматуры
CN110918797B (zh) * 2019-11-21 2022-01-18 浙江新龙实业有限公司 扩口锥面台阶管端成型加工工装
CN111872247A (zh) * 2020-07-30 2020-11-03 南通天缘自动车有限公司 一种车架组合头管用扩径装置

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Also Published As

Publication number Publication date
WO2014075778A1 (fr) 2014-05-22
AU2013347256B2 (en) 2017-05-18
RU2636428C2 (ru) 2017-11-23
CN104797358B (zh) 2018-01-16
AU2013347256A1 (en) 2015-07-02
CN104797358A (zh) 2015-07-22
EP2919927B1 (fr) 2017-03-29
RU2015123745A (ru) 2017-01-10
DE202012104450U1 (de) 2014-02-25

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