EP3953079B1 - Procédé de fabrication d'un arbre creux - Google Patents

Procédé de fabrication d'un arbre creux Download PDF

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Publication number
EP3953079B1
EP3953079B1 EP20717631.4A EP20717631A EP3953079B1 EP 3953079 B1 EP3953079 B1 EP 3953079B1 EP 20717631 A EP20717631 A EP 20717631A EP 3953079 B1 EP3953079 B1 EP 3953079B1
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EP
European Patent Office
Prior art keywords
preform
forming
hollow shaft
workpiece holder
profiling
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.)
Active
Application number
EP20717631.4A
Other languages
German (de)
English (en)
Other versions
EP3953079A1 (fr
Inventor
Bernd RUDERT
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.)
Winkelmann Powertrain Components GmbH and Co KG
Original Assignee
Winkelmann Powertrain Components GmbH and Co KG
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.)
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Publication of EP3953079A1 publication Critical patent/EP3953079A1/fr
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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • 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
    • B21D41/04—Reducing; Closing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H5/00—Making gear wheels, racks, spline shafts or worms
    • B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/063—Making machine elements axles or shafts hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/066—Making machine elements axles or shafts splined

Definitions

  • the invention relates to a method for producing a hollow shaft from a tubular preform by flow forming, wherein both ends of the preform are each formed with at least one forming roller, wherein a tubular preform with a round or polygonal cross-section is used and the preform is held by a workpiece holder in the central tube region during the entire manufacturing process up to the finished hollow shaft.
  • this known method is relatively complex, since in order to carry out the various process steps it is necessary to hold the preform or the partially already formed preform in different workpiece holders one after the other, so that a continuous forming process is not possible.
  • complex adjustment is required to ensure that the preform is exactly concentric with the forming rollers.
  • the method is limited to tubular preforms that can be stretched by flow forming.
  • the object of the invention is to further develop such a process in such a way that it enables a continuous process sequence and is universally applicable.
  • This object is achieved according to the invention in a method of the type described at the outset in that an external and/or internal profiling is introduced into both ends, wherein, before the external and/or internal profiling is introduced, an optionally profiled internal mandrel is axially inserted into both ends and the two internal mandrels are connected to one another at the front in a force-fitting and/or form-fitting manner.
  • the method makes it possible to carry out the entire forming process with just one workpiece holder, so that the entire forming process can run continuously. This also eliminates the need for additional adjustments that would be required when changing the workpiece holder. It is also possible to use tubular preforms with a round (circular) or polygonal cross-section, so that the hollow shaft produced in this way is suitable for various applications, e.g. for holding winding packages in an electric motor.
  • the preform is set in rotation relative to at least one forming roller, for which purpose the workpiece holder with the preform and/or the at least one forming roller is driven.
  • the middle tube area which is held by the workpiece holder, remains unchanged, while only the end areas are formed rotationally symmetrically, so that the middle area can, for example, hold winding packages of an electric motor without further forming. Since the middle area is not formed, no inner mandrel is required in the middle area, but inner mandrels are only inserted into the two end areas, while the preform in the middle area is held from the outside by a workpiece holder.
  • Both drawn and welded tubes can be used as preforms.
  • the two ends of the preform are formed at least partially simultaneously. This shortens the forming time on the one hand, and on the other hand leads to torque neutralization in the middle tube area.
  • At least one end is stepped once or several times, i.e. axially adjacent areas with different diameters are created.
  • the finished hollow shaft is to have an external or internal profile at both ends, it is intended that an internal mandrel is inserted into each end.
  • an external profile at least one correspondingly profiled forming roller and one non-profiled internal mandrel are used, and to introduce an internal profile, at least one non-profiled forming roller and one profiled internal mandrel are used.
  • the two inner mandrels are designed to be connected to one another in a force-fitting and/or form-fitting manner at the front.
  • the front ends of the two inner mandrels can, for example, have a spur gear and are pressed axially against one another and thereby locked so that any lateral radial forces that arise can be absorbed.
  • a tubular preform is in Fig.1 generally designated 1.
  • This tubular preform 1 can be a drawn or welded tube made of metal. It is essential for the invention that the tubular preform can have any round or polygonal cross-section.
  • Fig.2 It is indicated by way of example that it can have a circular, square or triangular cross-section. In general, any cross-sectional shape, preferably polygonal cross-sectional shape, is possible depending on the respective application.
  • this region is suitable, for example, for receiving winding packages of an electric motor or the like without further processing.
  • the invention provides that the tubular preform 1 is held in its central tube region 1a by a workpiece holder 2 throughout the entire manufacturing process up to the finished hollow shaft.
  • This split, ring-shaped workpiece holder 2 accordingly has an inner contour that corresponds to the outer contour of the tubular preform 1.
  • the entire process sequence can be carried out continuously without changing to another workpiece holder.
  • the two ends 1b and 1c of the preform 1 are formed at least partially simultaneously by means of forming rollers generally designated 3. At least one forming roller 3 is provided for forming each of the two ends 1b, 1c. In the embodiment according to the Fig. 3 and 4 For the forming of the end 1b, three forming rollers 3 and of the end 1c a forming roller 3 is indicated.
  • the forming rollers 3 are designed to be radially movable relative to the longitudinal axis 4 of the preform 1. Depending on the desired forming process, they can also be movable in the axial direction.
  • the spinning rollers 3 are set in rotation relative to the workpiece holder 2 and the tubular preform 1, so that either the spinning rollers 3 or the workpiece holder 2 with the preform 1 are driven.
  • the two ends 1b and 1c of the preform 1 are deformed rotationally symmetrically, ie the two ends 1b and 1c no longer have a polygonal cross-sectional shape if the original preform 1 had a polygonal cross-section.
  • the polygonal cross-section is of course retained in the unprocessed central region 1a.
  • the two ends 1b and 1c can be further formed without changing the workpiece holder 2.
  • Fig.5 It is shown that the two ends 1b and 1c are each designed with two steps in the radial direction. These stepped areas are in Fig.5 designated 1b', 1b" and 1c', 1c".
  • a profile is introduced into the two ends 1b and 1c, namely an inner profile 5 in the end 1b and an outer profile 6 on the end 1c.
  • the inner profile 5 and the outer profile 6 can be a toothing, a knurling or another geometric shape.
  • Fig.8 An embodiment which is not part of the invention is shown in Fig.8
  • the preform 1 is held unchanged in its middle area 1a in the workpiece holder 2 and an inner mandrel 7 without profiling is axially inserted into the already stepped end 1b, while an inner mandrel 8 with external profiling 8a is inserted into the end 1c.
  • Fig.8 In order to introduce an external profile 6 into the end 1b of the preform 1, at least one forming roller 9 with an external profile 9a is provided in addition to the inner mandrel 7.
  • At least one forming roller 10 without an external profile is provided in addition to the inner mandrel 8 with an external profile 8a, ie the end 1c is pressed into the external profile 8a of the inner mandrel 8 by the forming roller 10, so that the internal profile 5 is created.
  • Fig.8 In contrast to the embodiment according to Fig.8 are designed according to the Figs. 9 and 10 not two separate inner mandrels 7 and 8 are used, but the two inner mandrels 7' and 8' are connected to each other at the front and/or in a form-fitting manner.
  • the two inner mandrels 7' and 8' each have a complementary face toothing 7a, 8a.
  • the inner mandrels 7' and 8' are then pressed together in the axial direction during the forming process by applying pressure from the outside, which absorbs lateral radial forces that arise during the forming process.
  • This forming process is described in the Fig. 11 and 12
  • At least one forming roller 11 is used, which has a stepped, tubular outer peripheral area with a circumferential contact surface 11a. With this forming roller 11, an axial force F axial and a radial force F radial are applied to the preform 1.
  • This material feed can also be carried out several times, e.g. before the actual forming of the ends 1b, 1c and afterwards.
  • the entire manufacturing process can be carried out by cold forming alone. However, the forming can also take place entirely or temporarily under the influence of heat, e.g. by inductive heat generation. This allows the preform 1 to be hardened at the same time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Claims (5)

  1. Procédé de fabrication d'un arbre creux à partir d'une préforme tubulaire par fluotournage, dans lequel les deux extrémités de la préforme sont façonnées respectivement avec au moins un rouleau de formage, dans lequel une préforme (1) tubulaire avec une section transversale ronde ou polygonale est utilisée et la préforme (1) est maintenue dans la zone médiane du tube (1a) par un porte-pièce (2) pendant l'entièreté du processus de fabrication jusqu'à ce que l'arbre creux soit fini,
    caractérisé en ce que
    un profilage extérieur et/ou intérieur (5, 6) est introduit dans les deux extrémités (1b, 1c), dans lequel respectivement une épine intérieure (7, 7', 8, 8') éventuellement profilée est introduite axialement avant l'introduction du profilage extérieur et/ou intérieur (5, 6) dans les deux extrémités (1b, 1c) et les deux épines intérieures sont reliées l'une à l'autre côté avant à force et/ou par complémentarité de formes.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    une préforme (1) étirée ou soudée est utilisée.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    les deux extrémités (1b, 1c) de la préforme (1) sont façonnées au moins en partie simultanément.
  4. Procédé selon une ou plusieurs quelconques des revendications 1 à 3,
    caractérisé en ce que
    au moins une extrémité (1b, 1c) est étagée une ou plusieurs fois.
  5. Procédé selon une ou plusieurs quelconques des revendications 1 à 4,
    caractérisé en ce que
    le formage est effectué au moins temporairement par apport de chaleur.
EP20717631.4A 2019-04-08 2020-04-06 Procédé de fabrication d'un arbre creux Active EP3953079B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019109183.7A DE102019109183A1 (de) 2019-04-08 2019-04-08 Verfahren zur Herstellung einer Hohlwelle
PCT/EP2020/059743 WO2020207960A1 (fr) 2019-04-08 2020-04-06 Procédé de fabrication d'un arbre creux

Publications (2)

Publication Number Publication Date
EP3953079A1 EP3953079A1 (fr) 2022-02-16
EP3953079B1 true EP3953079B1 (fr) 2024-06-05

Family

ID=70224377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20717631.4A Active EP3953079B1 (fr) 2019-04-08 2020-04-06 Procédé de fabrication d'un arbre creux

Country Status (6)

Country Link
US (1) US20220219218A1 (fr)
EP (1) EP3953079B1 (fr)
JP (1) JP2022527535A (fr)
CN (1) CN111790801A (fr)
DE (1) DE102019109183A1 (fr)
WO (1) WO2020207960A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021103704B3 (de) 2021-02-17 2022-05-19 GFU - Maschinenbau GmbH Gesellschaft für Umformung und Maschinenbau Verfahren zum Herstellen einer einteiligen Hohlwelle aus einem rohrförmigen Werkstück aus Metall, damit hergestellte Hohlwelle und Vorrichtung sowie deren Verwendung
DE102021105744A1 (de) 2021-03-10 2022-09-15 Winkelmann Powertrain Components GmbH & Co. KG. Rotorhohlwelle
DE102021106672A1 (de) 2021-03-18 2022-09-22 Winkelmann Powertrain Components GmbH & Co. KG. Verfahren zur Herstellung einer Hohlwelle
DE102021127200B3 (de) 2021-10-20 2022-12-08 Thyssenkrupp Steel Europe Ag Verfahren und Drückwalzmaschine zur Herstellung einer drückgewalzten Hohlwelle
KR20230081672A (ko) * 2021-11-30 2023-06-07 이티에이 그린 파워 리미티드 모터 회전자 및 그 제조방법
CN115229017B (zh) * 2022-06-24 2024-06-21 中国石油大学(华东) 一种异形对轮旋压机

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DE2551156A1 (de) * 1975-11-14 1977-05-26 Hermanns Gebr Kremo Werke Verfahren und vorrichtung zur herstellung von kreisquerschnitt-hohlkoerpern mit in laengsachse verlaufenden inneren nuten, rillen oder kerben
SE435906B (sv) * 1981-02-03 1984-10-29 Ffv Affersverket Dorn for kallsmidning av invendigt profilerade ror eller hylsor
JPH0811261B2 (ja) * 1993-03-09 1996-02-07 橋田技研工業株式会社 瓶状金属容器の底付け加工方法とその装置
DE19532953A1 (de) * 1995-09-07 1997-03-13 Dynamit Nobel Ag Verfahren und Vorrichtung zur Herstellung von drückgewalzten Rohren mit inneren Wandverdickungen
JP3455892B2 (ja) * 1996-04-19 2003-10-14 株式会社久保田鉄工所 段状回転体の製造方法
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US6233993B1 (en) * 1999-05-10 2001-05-22 Sango Co., Ltd. Method and apparatus for forming a processed portion of a workpiece
JP2002035880A (ja) * 2000-07-18 2002-02-05 Uk:Kk 中空部品の製造方法
JP2002239657A (ja) * 2001-02-09 2002-08-27 Sango Co Ltd 管のスピニング加工方法
JP2003074336A (ja) * 2001-09-03 2003-03-12 Aisin Takaoka Ltd 排気ガス浄化装置及びその製造方法
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DE10337929A1 (de) * 2003-08-14 2005-03-17 Willy Voit Gmbh & Co. Verfahren zur Herstellung von einteiligen Hohlkörpern mit profilierten Endbereichen, Hohlkörper und Verwendung der Hohlkörper
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Also Published As

Publication number Publication date
EP3953079A1 (fr) 2022-02-16
DE102019109183A1 (de) 2020-10-08
CN111790801A (zh) 2020-10-20
WO2020207960A1 (fr) 2020-10-15
US20220219218A1 (en) 2022-07-14
JP2022527535A (ja) 2022-06-02

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