EP2148752A1 - Method for producing hollow shaft base bodies and hollow shaft base body produced according to said method - Google Patents

Method for producing hollow shaft base bodies and hollow shaft base body produced according to said method

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Publication number
EP2148752A1
EP2148752A1 EP08758076A EP08758076A EP2148752A1 EP 2148752 A1 EP2148752 A1 EP 2148752A1 EP 08758076 A EP08758076 A EP 08758076A EP 08758076 A EP08758076 A EP 08758076A EP 2148752 A1 EP2148752 A1 EP 2148752A1
Authority
EP
European Patent Office
Prior art keywords
hollow shaft
preform
particular according
forming
bore
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
EP08758076A
Other languages
German (de)
French (fr)
Other versions
EP2148752B1 (en
Inventor
Matthias Derse
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.)
Neumayer Tekfor Holding GmbH
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Neumayer Tekfor Holding GmbH
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Publication date
Application filed by Neumayer Tekfor Holding GmbH filed Critical Neumayer Tekfor Holding GmbH
Publication of EP2148752A1 publication Critical patent/EP2148752A1/en
Application granted granted Critical
Publication of EP2148752B1 publication Critical patent/EP2148752B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B21K1/10—Making machine elements axles or shafts of cylindrical form
    • 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
    • B21J5/10—Piercing billets
    • 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

Definitions

  • EP 1 745 870 A1 has disclosed a method for producing hollow shaft main bodies, this method being characterized in that, in a first step, the outer surface of a cylindrical starting material is machined by forming to at least a predetermined diameter transition in the longitudinal direction of a base body to obtain. During this first step, namely by means of a cross wedge rolling process, a hole should also be formed by means of one or two mandrels. Thereafter, in a further method step, namely by incremental forming, the outer and / or inner surface of the base body is produced.
  • the method for producing hollow-shaft basic bodies according to the invention provided with at least one bore is now characterized in that, in a first step, in which both the outer surface of a cylindrical starting material and the bore are formed by forming a preform or a blank is processed, at least a predetermined diameter transition in the longitudinal direction of the preform is generated, and
  • the preform is incrementally formed by reshaping the outer and / or inner surface of the main body to form the hollow shaft
  • Body is reshaped.
  • the blanks By producing a preform or a blank by forming, which is particularly suitable for the vast majority of applications, a forging process, the blanks can be made in simple tools and also provided with a hole and then serve as a raw material for the next step.
  • the bore can either only partially be introduced into the body or be continuous. Even with continuous drilling only a small amount of waste is present through the appropriately for forging process belonging punching the Butzens.
  • Forging tools By the use of forging tools a particularly favorable mass production is possible.
  • the previously mentioned punching the Butzens can also be done in a separate operation in a tool outside of a forging tool.
  • the forming into a preform can also be done in a forming process, the half-warm or - z. B. depending on the required degree of deformation or application - is carried out cold.
  • the preform thus produced is further reshaped, namely the inner and / or outer surface is reshaped, is suitable in particularly favorable manner the so-called rotary swaging, which may be application or product-related cold or Halbwarmrundkneten.
  • rotary swaging which may be application or product-related cold or Halbwarmrundkneten.
  • the invention further relates to hollow shafts, z.
  • transmission shafts which are produced by the inventive combination of at least one of the cited in the claims and protectable process steps, wherein the shaft has a continuous or only partially introduced bore.
  • the preform 1a has a shank portion 2a and a flange portion 3a and a through bore 4a.
  • the shaft region as well as the bore may be cylindrical or conical.
  • the preform 1a is made by a forging process, which is performed in a multi-stage mold.
  • One of the consequences of the bore 4a is introduced to a slug 5.
  • This slug is either punched out in a next station or can be punched out in a tool outside the forging tool.
  • the preform 1a is converted into the hollow shaft main body 1b, in particular incrementally, in particular by swaging, while the flange region 3a can be largely retained and the incremental deformation carried out in the region adjoining the region 3b.
  • a cylindrical or profiled mandrel can be inserted in sections from the side facing away from the flange region 3a by corresponding preforming of the region 2b and 2b ' .
  • FIG. 2 shows a further embodiment according to the invention, wherein the upper region 11 a of FIG. 2 represents the preform and the lower region in turn represents the hollow shaft main body 11 b.
  • the introduced in the forging process bore 12a extends only partially through the blank 11a, the area generated by incremental forming is denoted by 13.
  • the forging preform 21a is provided with an undercut 22 which, like the blank 21a, is made by forging.
  • the hollow shaft main body 21b shown in the lower part of Figure 3 is formed in the region 23 by swaging.
  • the region 23 may be supported by a mandrel during the forming process depending on the desired inner shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The invention relates to a method for producing hollow shaft base bodies and hollow shaft base body produced according to said method. Said method consists of a first step in which a preform (1a) having a transition diameter and a bore (4a) is produced by shaping, and an additional step in which the preform is shaped incrementally to form a hollow shaft base body (1b).

Description

Verfahren zur Herstellung von Hohlwellengrundkörpern sowie nach dem Verfahren hergestellte Hohlwellengrundkörper A method for the production of hollow shaft main bodies as well as hollow shaft main body produced by the method
Durch die EP 1 745 870 A1 ist ein Verfahren zur Herstellung von Hohlwellengrundkörpern bekannt geworden, wobei sich dieses Verfahren dadurch auszeichnet, dass in einem ersten Schritt die äußere Oberfläche eines zylindrischen Ausgangsmaterials durch Umformen bearbeitet wird, um wenigstens einen vorbestimmten Durchmesserübergang in der Längsrichtung eines Grundkörpers zu erhalten. Während dieses ersten Schrittes, nämlich mittels eines Querkeilwalz- Prozesses, soll auch eine Bohrung mittels eines oder zweier Dorne eingeformt werden. Danach wird in einem weiteren Verfahrensschritt, nämlich durch inkrementelles Umformen, die äußere und/oder innere Oberfläche des Grundkörpers hergestellt.EP 1 745 870 A1 has disclosed a method for producing hollow shaft main bodies, this method being characterized in that, in a first step, the outer surface of a cylindrical starting material is machined by forming to at least a predetermined diameter transition in the longitudinal direction of a base body to obtain. During this first step, namely by means of a cross wedge rolling process, a hole should also be formed by means of one or two mandrels. Thereafter, in a further method step, namely by incremental forming, the outer and / or inner surface of the base body is produced.
Abgesehen davon, dass die gleichzeitige Durchführbarkeit des Querkeilwalzens sowie das Einbringen mindestens eines Domes von wenigstens einer Seite zur Erzeugung wenigstens einer Bohrung zweifelhaft erscheint, ist das dort beschriebene Verfahren mit erheblichen Nachteilen behaftet, insbesondere sind teure und entwicklungsaufwendige Werkzeuge zur Durchführung des Querkeilwalzens erforderlich und die erzielbaren Taktzeiten sind hoch, d. h. es sind nur geringe Stückzahlen pro Zeiteinheit zu verwirklichen. Das in der EP OS angeführte Argument einer Ressourcenschonung mag bei der als alternativ angeführten Möglichkeit der Herstellung der Bohrung durch Fließpressen noch gelten (beim Fließpressen fällt lediglich ein relativ kleiner Butzen als Abfall an). Jedoch ist das Querkeilwalzen selbst hinsichtlich einer Ressourcenschonung nicht optimal, denn wie bekannt, muss am Ende eines jeden Querkeilwalz-Prozesses an den beiden Wellenenden der beim Querwalzen über die aktive Werkzeug-Länge hinaus gedrückte Materialanteil anschließend abgeschert werden und liegt dann als Abfall vor. Verschlechtert wird die Ressourcensituation darüber hinaus noch, wenn - wie als weitere mögliche Lösung angeführt - die Bohrung vor oder nach dem Querkeilwalz-Prozess spangebend hergestellt wird (wobei unklar bleibt, ob dieser Prozess als weiterer Schritt zu werten ist).Apart from the fact that the simultaneous feasibility of cross wedge rolling and the introduction of at least one dome of at least one side to produce at least one hole seems doubtful, the method described there is associated with considerable disadvantages, in particular expensive and development-consuming tools for performing the cross wedge rolling are required and achievable cycle times are high, ie only small quantities per unit time can be realized. The argument cited in the EP OS of a conservation of resources may still apply to the alternatively stated possibility of producing the bore by extrusion (in extrusion molding, only a relatively small slug is waste). However, cross wedge rolling itself is resource conservation not optimal, because as known, then at the end of each cross wedge rolling process at the two shaft ends of the transverse rolling beyond the active tool length addition pressed material portion must be sheared off then and is available as waste. In addition, the resource situation is worsened when, as suggested as another possible solution, the bore is made prior to or after the cross wedge rolling process (though it remains unclear whether this process is to be considered as a further step).
Der vorliegenden Erfindung lag die Aufgabe zugrunde, diese angeführten Nachteile zu beseitigen und eine einfachere und preiswertere Herstellung zu gewährleisten sowie dieThe present invention has for its object to eliminate these disadvantages and to ensure a simpler and cheaper production and the
Ressourcenschonung weiter zu optimieren. Darüber hinaus sollen teure Entwicklungen von Werkzeugen vermieden werden, weiterhin soll die Produktivität deutlich verbessert werden und darüber hinaus, für die nachfolgend durchzuführenden Bearbeitungsschritte eine Vorform mit optimaler Qualität zur Verfügung zu stellen. Außerdem soll die Herstellung der Bohrung so erfolgen, dass für die meisten Anwendungsfälle eineResource conservation continues to be optimized. In addition, expensive developments of tools are to be avoided, furthermore the productivity is to be significantly improved and, moreover, to provide a preform with optimum quality for the subsequent processing steps to be performed. In addition, the production of the hole should be made so that for most applications
Nachbearbeitung derselben nicht mehr erforderlich ist, denn beim nachstehend beschriebenen Herstellverfahren der Erfindung können Bohrungen so erzeugt werden, dass ein nachträgliches Ausrichten der Bohrung wegen Verlaufen eines Domes nicht mehr erforderlich ist.Post-processing of the same is no longer necessary, because in the manufacturing method of the invention described below, holes can be produced so that a subsequent alignment of the bore is no longer required for the course of a dome.
Das Verfahren zur Herstellung von mit mindestens einer Bohrung versehenen Hohlwellengrundkörpem gemäß der Erfindung zeichnet sich nun dadurch aus, dass - in einem ersten Schritt, in welchem sowohl die äußere Oberfläche eines zylindrischen Ausgangsmaterials als auch die Bohrung durch Umformen zu einem Vorformling bzw. einem Rohling bearbeitet wird, wenigstens ein vorbestimmter Durchmesserübergang in Längsrichtung des Vorformlings erzeugt wird, undThe method for producing hollow-shaft basic bodies according to the invention provided with at least one bore is now characterized in that, in a first step, in which both the outer surface of a cylindrical starting material and the bore are formed by forming a preform or a blank is processed, at least a predetermined diameter transition in the longitudinal direction of the preform is generated, and
- in einem weiteren Schritt der Vorformling durch Umformen der äußeren und/oder inneren Oberfläche des Grundkörpers inkrementell zu dem Hohlwellen-in a further step, the preform is incrementally formed by reshaping the outer and / or inner surface of the main body to form the hollow shaft
Grundkörper umgeformt wird.Body is reshaped.
Durch die Herstellung eines Vorformlings bzw. eines Rohlings durch Umformen, wobei sich hierfür für die weitaus meisten Anwendungsfälle ein Schmiedeprozess besonders eignet, können die Rohlinge in einfachen Werkzeugen hergestellt und auch mit einer Bohrung versehen werden und dienen sodann als Ausgangserzeugnis für den weiteren Schritt. Die Bohrung kann dabei entweder nur teilweise in den Grundkörper eingebracht werden oder auch durchgehend sein. Selbst bei durchgehender Bohrung ist lediglich ein geringer Abfall durch das zweckmäßigerweise zum Schmiedeprozess hinzugehörende Ausstanzen des Butzens vorhanden. Durch die Anwendung von Schmiedewerkzeugen ist eine besonders günstige Großserienherstellung ermöglicht. Das vorhin erwähnte Ausstanzen des Butzens kann aber auch in einem separaten Arbeitsgang in einem Werkzeug außerhalb eines Schmiedewerkzeuges erfolgen. Das Umformen zu einem Vorformling kann aber auch in einem Umformprozess erfolgen, der halbwarm oder - z. B. je nach erforderlichem Umformgrad oder Anwendungsfall - auch kalt durchgeführt wird.By producing a preform or a blank by forming, which is particularly suitable for the vast majority of applications, a forging process, the blanks can be made in simple tools and also provided with a hole and then serve as a raw material for the next step. The bore can either only partially be introduced into the body or be continuous. Even with continuous drilling only a small amount of waste is present through the appropriately for forging process belonging punching the Butzens. By the use of forging tools a particularly favorable mass production is possible. However, the previously mentioned punching the Butzens can also be done in a separate operation in a tool outside of a forging tool. The forming into a preform can also be done in a forming process, the half-warm or - z. B. depending on the required degree of deformation or application - is carried out cold.
Als weiterer Schritt, bei dem der so erzeugte Vorformling weiter umgeformt wird, nämlich die innere und/oder äußere Oberfläche umgeformt wird, eignet sich in besonders günstiger Weise das sogenannte Rundkneten, welches anwendungs- oder produktbedingt ein Kalt- oder Halbwarmrundkneten sein kann. Dadurch lässt sich in besonders preiswerter Weise und bei maximaler Materialausnutzung eine endkontumahe Geometrie erzeugen. Weiterhin liegt dadurch ein optimaler und ungeschnittener Faserverlauf vor, wodurch die Belastbarkeit günstig beeinflusst wird. Während dieses zweiten Arbeitsschrittes kann in besonders vorteilhafter Weise die Bohrung wenigstens eines der hohlen Wellenenden durch das inkrementelle Verfahren verschlossen werden.As a further step, in which the preform thus produced is further reshaped, namely the inner and / or outer surface is reshaped, is suitable in particularly favorable manner the so-called rotary swaging, which may be application or product-related cold or Halbwarmrundkneten. As a result, it is possible to produce an end-contour-like geometry in a particularly cost-effective manner and with maximum material utilization. Furthermore, this results in an optimal and uncut fiber profile, whereby the load capacity is favorably influenced. During this second step, the bore of at least one of the hollow shaft ends can be closed by the incremental method in a particularly advantageous manner.
Die Erfindung bezieht sich weiterhin auf Hohlwellen, z. B. Getriebewellen, die durch die erfindungsgemäße Kombination wenigstens eines der in den Patentansprüchen angeführten und schutzfähigen Verfahrensschritte hergestellt werden, wobei die Welle eine durchgehende oder eine lediglich teilweise eingebrachte Bohrung aufweist.The invention further relates to hollow shafts, z. As transmission shafts, which are produced by the inventive combination of at least one of the cited in the claims and protectable process steps, wherein the shaft has a continuous or only partially introduced bore.
Weiterhin kann es vorteilhaft sein, wenn während des ersten Schrittes zur Erzeugung des Vorformlings dieser mit einem Hinterschnitt versehen wird. Dies kann beispielsweise dadurch erfolgen, dass während des Schmiedevorganges an einer der Schmiedestufen ein Schieberwerkzeug eingesetzt wird, das aus mehreren auf den zu schmiedenden Körper zubewegbaren Segmenten besteht, die beim Pressvorgang zusammengefahren sind und zum Auswerfen des Teiles wieder auseinander bewegt werden. Anhand der Figuren 1-3 sei die Erfindung näher erläutert. Dabei zeigen die oberen Hälften der Figuren 1-3 jeweils den Vorformling und die unteren Hälften, die daraus hergestellten Hohlwellenkonturen.Furthermore, it may be advantageous if, during the first step for producing the preform, it is provided with an undercut. This can be done, for example, that during the forging process at one of the forging stages a slide tool is used, which consists of several zubewegbaren on the body to be molded segments that are moved together during the pressing process and are moved apart to eject the part again. The invention will be explained in more detail with reference to FIGS. 1-3. In this case, the upper halves of Figures 1-3 each show the preform and the lower halves, the hollow shaft contours produced therefrom.
In Figur 1 weist der Vorformling 1a einen Schaftabschnitt 2a und einen Flanschabschnitt 3a auf sowie eine durchgehende Bohrung 4a. Der Schaftbereich als auch die Bohrung können zylindrisch oder konisch ausgebildet sein.In FIG. 1, the preform 1a has a shank portion 2a and a flange portion 3a and a through bore 4a. The shaft region as well as the bore may be cylindrical or conical.
Der Vorformling 1a ist durch einen Schmiedevorgang hergestellt, welcher in einem Mehrstufenwerkzeug durchgeführt wird. Einer der Folgen wird die Bohrung 4a bis zu einem Butzen 5 eingebracht. Dieser Butzen wird entweder in einer nächsten Station ausgestanzt oder kann in einem Werkzeug außerhalb des Schmiedewerkzeuges ausgestanzt werden.The preform 1a is made by a forging process, which is performed in a multi-stage mold. One of the consequences of the bore 4a is introduced to a slug 5. This slug is either punched out in a next station or can be punched out in a tool outside the forging tool.
In einem zweiten Schritt wird der Vorformling 1a zu dem Hohlwellengrundkörper 1b umgearbeitet und zwar inkrementell wie insbesondere durch Rundkneten, dabei kann der Flanschbereich 3a weitgehend erhalten werden und die inkrementelle Umformung im sich an den Bereich 3b anschließenden Bereich durchgeführt werden. Je nach gewünschter Innenkontur 4b, kann durch entsprechendes Vorformen der Bereich 2b und 2b' abschnittsweise ein zylindrischer oder profilierter Dorn von der dem Flanschbereich 3a abgekehrten Seite her eingeschoben werden.In a second step, the preform 1a is converted into the hollow shaft main body 1b, in particular incrementally, in particular by swaging, while the flange region 3a can be largely retained and the incremental deformation carried out in the region adjoining the region 3b. Depending on the desired inner contour 4b, a cylindrical or profiled mandrel can be inserted in sections from the side facing away from the flange region 3a by corresponding preforming of the region 2b and 2b ' .
Der Bereich 2b' kann am Ende auch durch inkrementelles Umformen derart verkleinert werden, so dass die Bohrung 4b an ihrem Endbereich verschlossen ist. Figur 2 zeigt eine weitere Ausführungsform gemäß der Erfindung, wobei der obere Bereich 11 a der Figur 2 den Vorformling darstellt und der untere Bereich wiederum den Hohlwellengrundkörper 11b. Hier reicht die im Schmiedeprozess eingebrachte Bohrung 12a nur teilweise durch den Rohling 11a hinein, der durch inkrementelles Umformen erzeugte Bereich ist mit 13 bezeichnet.The area 2b ' can be reduced in the end by incremental forming so that the bore 4b is closed at its end. FIG. 2 shows a further embodiment according to the invention, wherein the upper region 11 a of FIG. 2 represents the preform and the lower region in turn represents the hollow shaft main body 11 b. Here, the introduced in the forging process bore 12a extends only partially through the blank 11a, the area generated by incremental forming is denoted by 13.
In Figur 3 ist der durch Schmieden hergestellte Vorformling 21a mit einem Hinterschnitt 22 versehen, der, ebenso wie der Rohling 21a, durch Schmieden hergestellt ist.In FIG. 3, the forging preform 21a is provided with an undercut 22 which, like the blank 21a, is made by forging.
Der im unteren Bereich der Figur 3 dargestellte Hohlwellengrundkörper 21b ist im Bereich 23 durch Rundkneten umgeformt. Der Bereich 23 kann je nach gewünschter Innenform während des Umformprozesses durch einen Dorn abgestützt sein. The hollow shaft main body 21b shown in the lower part of Figure 3 is formed in the region 23 by swaging. The region 23 may be supported by a mandrel during the forming process depending on the desired inner shape.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von mit einer Bohrung versehenen Hohlwellen- Grundkörpem, umfassend: - einen ersten Schritt, in welchem sowohl die äußere Oberfläche eines zylindrischen Ausgangsmaterials durch Umformen zu einem Vorformling bearbeitet wird, wobei wenigstens ein vorbestimmter Durchmesserübergang in Längsrichtung des Vorformlings sowie eine sich zumindest teilweise hindurch erstreckende Bohrung erzeugt wird, und - einen weiteren Schritt, in welchem der Vorformling durch Umformen der äußeren und/oder inneren Oberfläche des Grundkörpers inkrementell zu dem Hohlwellengrundkörper umgeformt wird.Anspruch [en] A method of making hollow core hollowed bodies, comprising: a first step of machining both the outer surface of a cylindrical stock by forming into a preform, wherein at least one predetermined diameter transition in the longitudinal direction of the preform; at least partially extending bore is produced, and - a further step, in which the preform is formed by forming the outer and / or inner surface of the base body incrementally to the hollow shaft main body.
2. Verfahren insbesondere nach Anspruch 1, dadurch gekennzeichnet, dass der zweite Schritt ein Rundkneten ist.2. Method in particular according to claim 1, characterized in that the second step is a rotary swaging.
3. Verfahren, insbesondere nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Vorformling während des ersten Schrittes mit einem Hinterschnitt versehen wird.3. A method, in particular according to claim 1 or 2, characterized in that the preform is provided during the first step with an undercut.
4. Verfahren, insbesondere nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass das Umformen zu einem Vorformling in halbwarmem Zustand erfolgt. 4. Method, in particular according to one of claims 1-3, characterized in that the forming takes place to a preform in a half-warm state.
5. Verfahren, insbesondere nach einem der Ansprüche 1-4, dadurch gekennzeichnet, dass das Umformen zu einem Vorformling in kaltem Zustand erfolgt.5. Method, in particular according to one of claims 1-4, characterized in that the forming takes place to a preform in a cold state.
6. Verfahren, insbesondere nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das inkrementelle Umformen in halbwarmem Zustand erfolgt.6. Method, in particular according to one of the preceding claims, characterized in that the incremental forming takes place in a half-warm state.
7. Verfahren, insbesondere nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Umformen im weiteren Schritt kalt erfolgt.7. Method, in particular according to one of the preceding claims, characterized in that the forming takes place in a further step cold.
8. Verfahren, insbesondere nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens eines der Hohlenwellenenden des Vorformlings durch inkrementelles Umformen wieder verschlossen wird.8. A method, in particular according to one of the preceding claims, characterized in that at least one of the hollow shaft ends of the preform is closed by incremental reshaping.
9. Hohlwelle, dadurch gekennzeichnet, dass deren mit einer Bohrung versehener Grundkörper:9. hollow shaft, characterized in that its base provided with a bore:
- in einem ersten Schritt, in welchem sowohl die äußere Oberfläche eines zylindrischen Ausgangsmaterials als auch die Bohrung durch Umformen zu einem Vorformling bearbeitet ist, wobei wenigstens ein bestimmter- In a first step, in which both the outer surface of a cylindrical starting material and the bore is machined by forming into a preform, wherein at least one particular
Durchmesserübergang in Längsrichtung des Vorformlings erzeugt ist, undDiameter transition is generated in the longitudinal direction of the preform, and
- der Hohlwellengrundkörper in einem weiteren Schritt, in welchem der Vorformling durch Umformen der äußeren und/oder inneren Oberfläche des Grundkörpers inkrementell zu dem Hohlwellengrundkörper umgeformt ist. - The hollow shaft main body in a further step, in which the preform is formed by forming the outer and / or inner surface of the base body incrementally to the hollow shaft main body.
10. Hohlwelle, insbesondere nach Anspruch 9, dadurch gekennzeichnet, dass die Bohrung durchgehend ist.10. hollow shaft, in particular according to claim 9, characterized in that the bore is continuous.
11. Hohlwelle, insbesondere nach Anspruch 9, dadurch gekennzeichnet, dass die Bohrung lediglich teilweise durch die Welle hindurch reicht.11. Hollow shaft, in particular according to claim 9, characterized in that the bore extends only partially through the shaft.
12. Hohlwelle, insbesondere nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mindestens eines der Hohlenwellenenden des12. hollow shaft, in particular according to one of the preceding claims, characterized in that at least one of the hollow shaft ends of
Vorformlings durch inkrementelles Umformen verschlossen ist. Preform is closed by incremental forming.
EP08758076A 2007-05-26 2008-05-15 Method for producing hollow shaft base bodies Not-in-force EP2148752B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007024743 2007-05-26
PCT/DE2008/000833 WO2008145092A1 (en) 2007-05-26 2008-05-15 Method for producing hollow shaft base bodies and hollow shaft base body produced according to said method

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EP2148752A1 true EP2148752A1 (en) 2010-02-03
EP2148752B1 EP2148752B1 (en) 2012-04-18

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EP (1) EP2148752B1 (en)
AT (1) ATE553867T1 (en)
DE (2) DE112008002036A5 (en)
WO (1) WO2008145092A1 (en)

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ATE553867T1 (en) 2012-05-15
DE102008023696A1 (en) 2008-12-24
DE112008002036A5 (en) 2010-04-29
WO2008145092A1 (en) 2008-12-04
EP2148752B1 (en) 2012-04-18

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