EP2012951B1 - Procedure for manufacturing a toothed wheel - Google Patents

Procedure for manufacturing a toothed wheel Download PDF

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Publication number
EP2012951B1
EP2012951B1 EP07718414.1A EP07718414A EP2012951B1 EP 2012951 B1 EP2012951 B1 EP 2012951B1 EP 07718414 A EP07718414 A EP 07718414A EP 2012951 B1 EP2012951 B1 EP 2012951B1
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EP
European Patent Office
Prior art keywords
metal blank
powdered metal
profile
powder metal
toothing
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.)
Not-in-force
Application number
EP07718414.1A
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German (de)
French (fr)
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EP2012951A1 (en
Inventor
Christian Sander
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.)
Miba Sinter Austria GmbH
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Miba Sinter Austria GmbH
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Publication date
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Publication of EP2012951A1 publication Critical patent/EP2012951A1/en
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    • 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
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth
    • 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
    • B21H5/022—Finishing gear teeth with cylindrical outline, e.g. burnishing
    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49462—Gear making
    • Y10T29/49467—Gear shaping
    • Y10T29/49471—Roll forming

Definitions

  • the invention is therefore based on the object, a method of the type described for the manufacture of a gear in such a way that a good dimensional stability of the gear when compacting the teeth can be ensured without having to accept excessive tool wear or higher tool or workpiece stresses in purchasing.
  • the invention solves this problem by the fact that the powder metal blank is compacted at the same time by an axial rolling to the powder metal blank of the pusher tool forming profile rollers over the entire circumference.
  • the device To carry out the manufacturing process can be assumed by the device with a holder for an oversized pressed and sintered powder metal blank of the gear and with at least one pusher tool, which engages an engaging in the teeth of the powder metal blank Forms counter-toothing.
  • the pusher tool comprises a closed ring of the counter teeth forming profile rollers whose axes are in a common plane perpendicular to the axis of the powder metal blank plane, wherein the profile rollers are guided in parallel to the axis of the powder metal blank profile grooves of the profile rollers surrounding support body.
  • the profile rollers in the common diameter plane optionally without joints join together under an elastic bias and enclose a Sollumriß the gear corresponding cross-section, a sufficient relative to the support body coaxially displaceable, axial support for the powder metal blank to the powder metal blank under a rolling of the profile rollers along the Pressing teeth axially through the cross-section enclosed by the profile roller collar and thereby compacting the teeth of the powder metal blank in the area of the oversize.
  • the occurring rolling forces can be removed in an advantageous manner by the profile rollers on the supporting rollers enclosing the profile rollers, which is provided for rolling the profile rollers with axial profile grooves, in which the profile rollers are guided against lateral displacement.
  • the profile rollers can be held in a relative to the support body axially displaceable cage, which may consist of two profile rollers between them receiving punches in a simple embodiment.
  • a free displaceability of such a cage roll the profile rollers substantially without slip on the one hand on the powder metal blank and on the other hand in the profile of the support body.
  • the cage is axially displaced relative to the support body at a predeterminable speed, then the rolling movement of the profile rollers can be superimposed by a sliding movement, via which influence on the compression ratios in the engagement area of the profile rollers can be taken.
  • the axial holder can have two the powder metal blank between them receiving portions. Form these sections of the holder beyond the tooth spaces of the gear to be produced corresponding axial Profilenuten, the profile rollers can be advantageously performed in these profile grooves and align the holder with the powder metal blank in the circumferential direction.
  • the profile rollers of the pusher tool can touch each other along frontal conical surfaces, so that during plastic compression of the teeth of the powder metal blank penetration of the material between two profile rollers can be excluded Especially when the profile rollers are pressed against each other in the contact area under a resilient bias.
  • the illustrated apparatus for producing a gear from a compacted and sintered powder metal blank 1 has a mandrel 2 radially supporting the powder metal blank 1 at least during its compression in the tooth region, which is mounted in a stationary manner according to the embodiment shown.
  • a holder 3 of two sections 4 and 5 is mounted axially displaceable, which receive the powder metal blank 1 between them form fit.
  • a pusher tool 7 is provided which comprises a closed ring of profile rollers 8, whose axes in a common, to the axis of the dome 2 and thus to Axis of the powder metal blank 1 vertical diameter plane lie.
  • profile rollers 8 form an engaging in the teeth of the powder metal blank 1 counter teeth that cause the rolling of the powder metal blank 1, the compression of the teeth of the powder metal blank 1 in the range of their allowance.
  • the profile rollers 8 engage in axial profile grooves 9 of the profile rollers 8 enclosing the support body 10 a.
  • the profile rollers 8 are guided in the profile grooves 6 of the holder 3, which is thus held aligned relative to the profile rollers 8 in the circumferential direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Gears, Cams (AREA)

Description

Technisches GebietTechnical area

Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines Zahnrades aus einem mit einem Aufmaß im Verzahnungsbereich gepreßten und gesinterten Pulvermetallrohling, wobei der Pulvermetallrohling im Bereich des Aufmaßes durch ein Abrollen eines eine in die Verzahnung des Pulvermetallrohlings eingreifende Gegenverzahnung bildenden Drückerwerkzeuges unter einer plastischen Verformung um das Aufmaß verdichtet wird, sowie auf eine Vorrichtung zur Durchführung des Verfahrens gemäß dem Oberbegriff des Patentanspruchs 3.The invention relates to a method for producing a toothed wheel from a powder metal blank pressed and sintered with an oversize in the toothed area, wherein the powder metal blank is deformed in the area of the oversize by a pusher tool forming a toothing of the powder metal blank Surplus is compressed, and to an apparatus for performing the method according to the preamble of claim 3.

Ein derartiges Verfahren und eine derartige Vorrichtung gehen beispielsweise aus der AT 412 955 B hervor.Such a method and such a device, for example, from the AT 412 955 B out.

Stand der TechnikState of the art

Um eine höhere Dauerbiegefestigkeit im Bereich der Zahnfüße und eine höhere Verschleißfestigkeit im Bereich der Zahnflanken bei pulvermetallurgisch hergestellten Zahnrädern zu erreichen, ist es bekannt ( EP 0 552 272 B1 , AT 406 836 B ), die gesinterten Pulvermetallrohlinge der Zahnräder im Flanken- und im Fußbereich der Zähne zu verdichten, so daß eine weitgehend porenfreie Oberflächenschicht erhalten wird, die im Eingriffsbereich des Zahnrades eine erhebliche Steigerung der zulässigen Belastbarkeit mit sich bringt. Die Verdichtung der Oberflächenschicht im Eingriffsbereich des Zahnrades erfolgt über ein Drückerwerkzeug in Form wenigstens eines Zahnrades, das entweder eine in die Verzahnung des Pulvermetallrohlings eingreifende Außenverzahnung ( EP 0 552 B1 ) oder eine Innenverzahnung ( AT 406 836 B ) aufweist, mit deren Hilfe die Gleitgeschwindigkeit zwischen den Zahnflanken des Pulvermetallrohlings und des Drückerwerkzeuges verringert werden kann. Darüber hinaus ist es bekannt ( WO 0043148 A1 ), als Drückerwerkzeug eine in die Verzahnung des Pulvermetallrohlings eingreifende Schnecke einzusetzen, deren Achse quer zur Achse des Pulvermetallrohlings verläuft. Unabhängig von der Art des eingesetzten Drückerwerkzeuges besteht jedoch die Gefahr, daß die örtlich zwischen dem Drückerwerkzeug und einem das Zahnrad aufnehmenden Dorn auftretenden Druckkräfte eine plastischen Verformung des gesamten Radquerschnittes verursachen, was nicht nur eine unzureichende Verdichtung der Zahnflanken nach sich zieht, sondern auch zu einer unzulässigen Vergrößerung des Radumfanges führt, insbesondere bei Zahnrädern mit einem gegenüber dem Fußkreis vergleichsweise großen Innendurchmesser. Zur Vermeidung dieses Nachteils wurde bereits vorgeschlagen ( AT 412 955 B ), den Pulvermetallrohling während seiner Verdichtung an beiden Stirnseiten über den Umfang radial einzuspannen, was jedoch zusätzliche Maßnahmen erfordert, die jedoch nicht verhindern können, daß es durch wechselnde Überdeckungsverhältnisse zu Schwankungen in der Walzkraft und damit zu einer Schwingungsanregung kommt, die zu einer erhöhten Belastung des Werkzeuges und des Werkstückes und in Folge zu einer Leistungsbegrenzung führt.In order to achieve a higher bending fatigue strength in the area of the tooth roots and a higher wear resistance in the region of the tooth flanks in powder-metallurgically produced toothed wheels, it is known ( EP 0 552 272 B1 . AT 406 836 B ), the sintered powder metal blanks of the gears in the flank and the foot of the teeth to densify, so that a largely non-porous surface layer is obtained, which brings in the engagement region of the gear a significant increase in the allowable load capacity. The compaction of the surface layer in the engagement region of the toothed wheel takes place via a pusher tool in the form of at least one toothed wheel, which either has an external toothing (FIG. 3) engaging in the toothing of the powder metal blank (FIG. EP 0 552 B1 ) or an internal toothing ( AT 406 836 B ), with the aid of which the sliding speed between the tooth flanks of the powder metal blank and the pusher tool can be reduced. In addition, it is known ( WO 0043148 A1 ), as a pusher tool to engage a meshing in the teeth of the powder metal blank screw whose axis transverse to Axis of the powder metal blank runs. Regardless of the type of pusher tool used, however, there is a risk that the pressure forces occurring locally between the pusher tool and a mandrel receiving the gear cause a plastic deformation of the entire wheel cross-section, which not only leads to insufficient compaction of the tooth flanks, but also to a Inadmissible enlargement of the wheel circumference leads, especially in gears with a comparison with the root circle comparatively large inner diameter. To avoid this disadvantage has already been proposed ( AT 412 955 B ), radially clamp the powder metal blank during its compression at both ends over the circumference, which, however, requires additional measures, but which can not prevent that it comes by changing coverage ratios to fluctuations in the rolling force and thus to a vibration excitation, which leads to an increased load of the tool and the workpiece and consequently leads to a power limitation.

Schließlich ist es bekannt ( US 6 168 754 B1 ), zum Verdichten des Zahnfußes und der Zahnflanken eines aus einem gepreßten und gesinterten Pulvermetallrohling hergestellten Zahnrades ein Matrizenwerkzeug vorzusehen, das mit axialem Abstand aufeinanderfolgende Matrizenplatten mit abgestuft kleinerem Durchtrittsquerschnitt für den mittels eines Stempels axial durch das Matrizenwerkzeug drückbaren Pulvermetallrohling aufweist. Wegen des gleichzeitigen Verdichtens des Pulvermetallrohlings über den gesamten Außenumfang kann eine gute Formstabilität für die verdichteten Zahnbereiche sichergestellt werden. Allerdings wird diese Formstabilität mit einer ausschließlichen Gleitreibung zwischen Werkstück und Werkzeug erkauft, was zu einem erhöhten Verschleiß des Werkzeuges und einem entsprechenden Abrieb am Werkstück Anlaß gibt.Finally, it is known ( US Pat. No. 6,168,754 B1 ), for compacting the tooth root and the tooth flanks of a gear made of a pressed and sintered powder metal blank to provide a die tool having axially spaced successive die plates with stepped smaller passage cross section for the means of a punch axially pressed by the die tool powder blank. Because of the simultaneous compacting of the powder metal blank over the entire outer circumference, a good dimensional stability for the compacted tooth areas can be ensured. However, this dimensional stability is bought with an exclusive sliding friction between the workpiece and the tool, which gives rise to increased wear of the tool and a corresponding abrasion on the workpiece.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt somit die Aufgabe zugrunde, ein Verfahren der eingangs geschilderten Art zum Herstellen eines Zahnrades so auszugestalten, daß eine gute Formstabilität des Zahnrades beim Verdichten der Zähne gewährleistet werden kann, ohne einen übermäßigen Werkzeugverschleiß oder höhere Werkzeug- bzw. Werkstückbeanspruchungen in Kauf nehmen zu müssen.The invention is therefore based on the object, a method of the type described for the manufacture of a gear in such a way that a good dimensional stability of the gear when compacting the teeth can be ensured without having to accept excessive tool wear or higher tool or workpiece stresses in purchasing.

Die Erfindung löst die gestellte Aufgabe dadurch, daß der Pulvermetallrohling durch ein zum Pulvermetallrohling axiales Abrollen von das Drückerwerkzeug bildenden Profilrollen über den gesamten Umfang gleichzeitig verdichtet wird.The invention solves this problem by the fact that the powder metal blank is compacted at the same time by an axial rolling to the powder metal blank of the pusher tool forming profile rollers over the entire circumference.

Durch das Abrollen von Profilrollen mit einem der Negativform eines Zahnquerschnittes entsprechenden Profil auf dem Pulvermetallrohling in dessen Achsrichtung
wird zunächst eine glatte Werkstückoberfläche ohne Abrieb erreicht. Da die Profilrollen außerdem gleichzeitig über den gesamten Außenumfang des Pulvermetallrohlings wirksam werden und demzufolge die Zähne gleichartig und symmetrisch belasten, kann eine hohe Formstabilität sichergestellt werden. Die gleichzeitige Verdichtung aller Zähne vermeidet darüber hinaus Schwingungsanregungen, die zu einer erhöhten Beanspruchung des Werkzeuges oder des Werkstückes führen könnten, so daß vergleichsweise große Bearbeitungsgeschwindigkeiten und damit eine Verbesserung der Wirtschaftlichkeit des Herstellungsverfahrens möglich werden.By rolling profile rolls with one of the negative shape of a tooth cross section corresponding profile on the powder metal blank in the axial direction
First, a smooth workpiece surface is achieved without abrasion. In addition, since the profiled rollers become effective simultaneously over the entire outer circumference of the powder metal blank, and thus load the teeth uniformly and symmetrically, high dimensional stability can be ensured. The simultaneous compression of all teeth also avoids vibration excitations that could lead to increased stress on the tool or the workpiece, so that comparatively high processing speeds and thus improving the efficiency of the manufacturing process are possible.

Um einen zusätzlichen Einfluß auf die Verdichtung der Zahnoberflächen im Bereich des Aufmaßes nehmen zu können, können die Profilrollen mit einem vorgebbaren Schlupf auf dem Pulvermetallrohling abgerollt werden. In einem solchen Fall kann das Fließen des Werkstoffes während der plastischen Verformung durch die bei einem Schlupf zwischen den Profilrollen und dem Werkstück auftretende Gleitreibung zumindest örtlich unterstützt werden. Die erfindungsgemäße Vorrichtung ist in Patentanspruch 3 definiert.In order to be able to exert an additional influence on the compaction of the tooth surfaces in the area of the oversize, the profile rollers can be unrolled with a predeterminable slip on the powder metal blank. In such a case, the flow of the material during the plastic deformation can be supported at least locally by the sliding friction occurring during a slip between the profile rollers and the workpiece. The device according to the invention is defined in claim 3.

Zur Durchführung des Herstellungsverfahrens kann von der Vorrichtung mit einer Halterung für einen mit Aufmaß gepreßten und gesinterten Pulvermetallrohling des Zahnrades und mit wenigstens einem Drückerwerkzeug ausgegangen werden, das eine in die Verzahnung des Pulvermetallrohlings eingreifende Gegenverzahnung bildet. Zum Unterschied von bekannten Vorrichtungen dieser Art umfaßt das Drückerwerkzeug einen geschlossenen Kranz von die Gegenverzahnung bildenden Profilrollen deren Achsen in einer gemeinsamen zur Achse des Pulvermetallrohlings senkrechten Ebene liegen, wobei die Profilrollen in zur Achse des Pulvermetallrohlings parallelen Profilnuten eines die Profilrollen umschließenden Stützkörpers geführt sind. Da die Profilrollen in der gemeinsamen Durchmesserebene gegebenenfalls unter einer elastischen Vorspannung fugenlos aneinander anschließen und einen dem Sollumriß des Zahnrades entsprechenden Querschnitt umschließen, reicht eine relativ zum Stützkörper koaxial verschiebbare, axiale Halterung für den Pulvermetallrohling aus, um den Pulvermetallrohling unter einem Abrollen der Profilrollen entlang der Zähne axial durch den vom Profilrollenkranz umschlossenen Querschnitt zu drücken und dabei die Zähne des Pulvermetallrohlings im Bereich des Aufma-ßes zu verdichten. Die auftretenden Walzkräfte können in vorteilhafter Weise von den Profilrollen auf den die Profilrollen umschließenden Stützkörper abgetragen werden, der zum Abrollen der Profilrollen mit axialen Profilnuten versehen ist, in denen die Profilrollen gegen ein seitliches Versetzen geführt sind.To carry out the manufacturing process can be assumed by the device with a holder for an oversized pressed and sintered powder metal blank of the gear and with at least one pusher tool, which engages an engaging in the teeth of the powder metal blank Forms counter-toothing. In contrast to known devices of this type, the pusher tool comprises a closed ring of the counter teeth forming profile rollers whose axes are in a common plane perpendicular to the axis of the powder metal blank plane, wherein the profile rollers are guided in parallel to the axis of the powder metal blank profile grooves of the profile rollers surrounding support body. Since the profile rollers in the common diameter plane optionally without joints join together under an elastic bias and enclose a Sollumriß the gear corresponding cross-section, a sufficient relative to the support body coaxially displaceable, axial support for the powder metal blank to the powder metal blank under a rolling of the profile rollers along the Pressing teeth axially through the cross-section enclosed by the profile roller collar and thereby compacting the teeth of the powder metal blank in the area of the oversize. The occurring rolling forces can be removed in an advantageous manner by the profile rollers on the supporting rollers enclosing the profile rollers, which is provided for rolling the profile rollers with axial profile grooves, in which the profile rollers are guided against lateral displacement.

Zur Vermeidung einer gegenseitigen Verlagerung der Profilrollen in Richtung der Achse des Stützkörpers können die Profilrollen in einem gegenüber dem Stützkörper axial verschiebbaren Käfig gehalten werden, der in einer einfachen Ausführungsform aus zwei die Profilrollen zwischen sich aufnehmenden Stempeln bestehen kann. Bei einer freien Verschiebbarkeit eines solchen Käfigs rollen die Profilrollen im wesentlichen schlupffrei einerseits auf dem Pulvermetallrohling und anderseits in den Profilnuten des Stützkörpers ab. Wird der Käfig jedoch mit einer vorgebbaren Geschwindigkeit gegenüber dem Stützkörper axial verschoben, so kann der Abrollbewegung der Profilrollen eine Gleitbewegung überlagert werden, über die Einfluß auf die Verdichtungsverhältnisse im Eingriffsbereich der Profilrollen genommen werden kann.To avoid a mutual displacement of the profile rollers in the direction of the axis of the support body, the profile rollers can be held in a relative to the support body axially displaceable cage, which may consist of two profile rollers between them receiving punches in a simple embodiment. With a free displaceability of such a cage roll the profile rollers substantially without slip on the one hand on the powder metal blank and on the other hand in the profile of the support body. However, if the cage is axially displaced relative to the support body at a predeterminable speed, then the rolling movement of the profile rollers can be superimposed by a sliding movement, via which influence on the compression ratios in the engagement area of the profile rollers can be taken.

Damit auf den Pulvermetallrohling eine zum Durchdrücken zwischen den Profilrollen erforderliche axiale Kraft ausgeübt und der Pulvermetallrohling gegensinnig axial beaufschlagt werden kann, kann die axiale Halterung zwei den Pulvermetallrohling zwischen sich aufnehmende Abschnitte aufweisen. Bilden diese Abschnitte der Halterung darüber hinaus den Zahnlücken des herzustellenden Zahnrades entsprechende axiale Profilnuten, so können die Profilrollen vorteilhaft in diesen Profilnuten geführt werden und die Halterung mit dem Pulvermetallrohling in Umfangsrichtung ausrichten.Thus exerted on the powder metal blank for pressing between the profile rollers required axial force and the powder metal blank in opposite directions can be acted upon axially, the axial holder can have two the powder metal blank between them receiving portions. Form these sections of the holder beyond the tooth spaces of the gear to be produced corresponding axial Profilnuten, the profile rollers can be advantageously performed in these profile grooves and align the holder with the powder metal blank in the circumferential direction.

Wie bereits ausgeführt wurde, ist es für eine vorteilhafte Verdichtung der Zähne des Pulvermetallrohlings von besonderer Bedeutung, daß die Profilrollen in ihrer gemeinsamen Durchmesserebene einen geschlossenen Kranz bilden. Um der Gefahr vorzubeugen, daß sich bei einer Werkzeugabnützung zwischen den aneinanderstoßenden Profilrollen ein Bearbeitungsgrat ausbilden kann, können die Profilrollen des Drückerwerkzeuges einander entlang von stirnseitigen Kegelflächen berühren, so daß beim plastischen Verdichten der Zähne des Pulvermetallrohlings ein Eindringen des Werkstoffes zwischen zwei Profilrollen ausgeschlossen werden kann, insbesondere wenn die Profilrollen im Berührungsbereich unter einer elastischen Vorspannung gegeneinander gedrückt werden.As already stated, it is of particular importance for an advantageous compression of the teeth of the powder metal blank that the profile rollers form a closed rim in their common diameter plane. In order to prevent the risk that can form a Bearbeitungsgrat at a Werkzeugabnützung between the abutting profile rollers, the profile rollers of the pusher tool can touch each other along frontal conical surfaces, so that during plastic compression of the teeth of the powder metal blank penetration of the material between two profile rollers can be excluded Especially when the profile rollers are pressed against each other in the contact area under a resilient bias.

Kurze Beschreibung der ZeichnungShort description of the drawing

An Hand der Zeichnung wird das Verfahren nach der Erfindung näher beschrieben. Es zeigen

Fig. 1
eine erfindungsgemäße Vorrichtung zum Herstellen eines Zahnrades in einem vereinfachten Axialschnitt,
Fig. 2
diese Vorrichtung ausschnittsweise in einem Schnitt nach der Linie II-II der Fig. 1 in einem größeren Maßstab und die
Fig. 3
und 4 die Vorrichtung in einer der Fig. 1 entsprechenden Darstellung, jedoch in unterschiedlichen Arbeitsstellungen und in einem kleineren Maßstab.
With reference to the drawing, the method of the invention will be described in detail. Show it
Fig. 1
a device according to the invention for producing a toothed wheel in a simplified axial section,
Fig. 2
this device fragmentary in a section along the line II-II of Fig. 1 on a larger scale and the
Fig. 3
and 4 the device in one of Fig. 1 corresponding representation, but in different working positions and on a smaller scale.

Weg zur Ausführung der ErfindungWay to carry out the invention

Die dargestellte Vorrichtung zum Herstellen eines Zahnrades aus einem verdichteten und gesinterten Pulvermetallrohling 1 weist einen den Pulvermetallrohling 1 zumindest während seiner Verdichtung im Zahnbereich radial abstützenden Dorn 2 auf, der gemäß dem gezeigten Ausführungsbeispiel ortsfest gelagert ist. Auf diesem Dorn 2 ist eine Halterung 3 aus zwei Abschnitten 4 und 5 axial verschiebbar gelagert, die den Pulvermetallrohling 1 zwischen sich formschlüssig aufnehmen. Die Abschnitte 4 und 5 bilden den Zahnlücken des herzustellenden Zahnrades entsprechende axiale Profilnuten 6. Zum Bearbeiten des Pulvermetallrohlings 1 ist ein Drückerwerkzeug 7 vorgesehen, das einen geschlossenen Kranz von Profilrollen 8 umfaßt, deren Achsen in einer gemeinsamen, zur Achse des Domes 2 und damit zur Achse des Pulvermetallrohlings 1 senkrechten Durchmesserebene liegen. Diese Profilrollen 8 bilden eine in die Verzahnung des Pulvermetallrohlings 1 eingreifende Gegenverzahnung, die beim Abrollen auf dem Pulvermetallrohling 1 die Verdichtung der Zähne des Pulvermetallrohlings 1 im Bereich ihres Aufmaßes bewirken. Zur Führung der Profilrollen 8 in Richtung der Achse des Pulvermetallrohlings 1 greifen die Profilrollen 8 in axiale Profilnuten 9 eines die Profilrollen 8 umschließenden Stützkörpers 10 ein. Außerdem sind die Profilrollen 8 in den Profilnuten 6 der Halterung 3 geführt, die somit gegenüber den Profilrollen 8 in Umfangsrichtung ausgerichtet gehalten wird. Damit bei einer Verlagerung der Profilrollen 8 entlang der Profilnuten 9 des Stützkörpers 10 die Profilrollen 8 in einer gemeinsamen Durchmesserebene verbleiben, werden die Profilrollen 8 in einem Käfig 11 geführt, der im Ausführungsbeispiel in einfacher Weise aus zwei in den Ringspalt zwischen dem Stützkörper 10 und der Halterung 3 für den Pulvermetallrohling 1 eingreifenden Stempeln 12 und 13 gebildet wird, was aber selbstverständlich nicht zwingend ist.The illustrated apparatus for producing a gear from a compacted and sintered powder metal blank 1 has a mandrel 2 radially supporting the powder metal blank 1 at least during its compression in the tooth region, which is mounted in a stationary manner according to the embodiment shown. On this mandrel 2, a holder 3 of two sections 4 and 5 is mounted axially displaceable, which receive the powder metal blank 1 between them form fit. To edit the powder metal blank 1, a pusher tool 7 is provided which comprises a closed ring of profile rollers 8, whose axes in a common, to the axis of the dome 2 and thus to Axis of the powder metal blank 1 vertical diameter plane lie. These profile rollers 8 form an engaging in the teeth of the powder metal blank 1 counter teeth that cause the rolling of the powder metal blank 1, the compression of the teeth of the powder metal blank 1 in the range of their allowance. To guide the profile rollers 8 in the direction of the axis of the powder metal blank 1, the profile rollers 8 engage in axial profile grooves 9 of the profile rollers 8 enclosing the support body 10 a. In addition, the profile rollers 8 are guided in the profile grooves 6 of the holder 3, which is thus held aligned relative to the profile rollers 8 in the circumferential direction. Thus, with a displacement of the profile rollers 8 along the profile grooves 9 of the support body 10, the profile rollers 8 remain in a common diameter plane, the profile rollers 8 are guided in a cage 11, in the embodiment in a simple manner from two into the annular gap between the support body 10 and the Holder 3 for the powder metal blank 1 engaging punches 12 and 13 is formed, but this is of course not mandatory.

Wie der Fig. 2 entnommen werden kann, weisen die Profilrollen 8 an ihren Stirnseiten Kegelflächen 14 auf. Da sich die Profilrollen 8 entlang dieser stirnseitigen Kegelflächen 14 aneinander abstützen, ergeben sich im Bereich der Zahnköpfe des Pulvermetallrohlings 1 vorteilhafte Abstützbedingungen, die eine Überlastung der Profilrollen 8 in diesem Bereich ausschließen.Again Fig. 2 can be removed, the profile rollers 8 conical surfaces 14 on their front sides. Since the profile rollers 8 are supported against one another along these end-side conical surfaces 14, they result in the region of Tooth heads of the powder metal blank 1 advantageous support conditions that exclude an overload of the profile rollers 8 in this area.

Um ein Zahnrad aus einem gesinterten Pulvermetallrohling 1 herzustellen, wird der Pulvermetallrohling 1 gemäß der Fig. 1 bei geöffneter Halterung 3 auf den einen Halterungsabschnitt 4 entsprechend ausgerichtet aufgesetzt, bevor die Halterung 3 geschlossen und der mit dem Abschnitt 5 der Halterung 3 abgehobene Stempel 13 des Käfigs 11 gegen den Kranz der Profilrollen 8 abgesenkt wird. Zur Verdichtung der Zähne des Pulvermetallrohlings 1 ist nunmehr die Halterung 3 mit dem Pulvermetallrohling 1 relativ zum Stützkörper 10 axial zu verschieben, um ein Abrollen der Profilrollen 8 auf den Zähnen des Pulvermetallrohlings 1 unter einem Verdichten der Zahnoberflächen um das jeweilige Aufmaß zu erreichen. Gemäß dem dargestellten Ausführungsbeispiel bleiben der Stützkörper 10 und der Dorn 2 ortsfest während die Halterung 3 axial beaufschlagt wird. Die Profilrollen 8 rollen dabei in den Profilnuten 9 des Stützkörpers 10 und in den Profilnuten 6 der Halterung 3 sowie über die die Profilnuten 6 fortsetzenden Zahnoberflächen des Pulvermetallrohlings 1 ab. In den Fig. 3 und 4 ist die Stellung des Drückerwerkzeuges 7 unmittelbar vor und nach der Verdichtung der Verzahnung des Pulvermetallrohlings 1 dargestellt. Wie diesen Fig. 3 und 4 entnommen werden kann, wird der durch die Stempel 12 und 13 gebildete Käfig 11 mit den Profilrollen 8 in Richtung der Dornachse mitbewegt, so daß eine im wesentlichen schlupffreie Abrollbewegung der Profilrollen 8 auf dem Pulvermetallrohling 1 gewährleistet ist. Durch eine Verzögerung oder Beschleunigung des Käfigs 11 kann der Rollbewegung der Profilrollen 8 eine Gleitbewegung überlagert werden. Diese Überlagerung bedingt im Bereich des Pulvermetallrohlings 1 eine zusätzliche Gleitreibung, mit deren Hilfe Einfluß auf den Verdichtungsvorgang genommen werden kann.To produce a gear from a sintered powder metal blank 1, the powder metal blank 1 according to the Fig. 1 with the holder 3 open on the one support portion 4 aligned aligned before the holder 3 is closed and the lifted off with the portion 5 of the holder 3 punch 13 of the cage 11 is lowered against the rim of the profile rollers 8. For compacting the teeth of the powder metal blank 1, the holder 3 with the powder metal blank 1 is now to be displaced axially relative to the supporting body 10 in order to unroll the profile rollers 8 on the teeth of the powder metal blank 1 while compacting the tooth surfaces by the respective allowance. According to the illustrated embodiment, the support body 10 and the mandrel 2 remain stationary while the holder 3 is acted upon axially. The profile rollers 8 roll thereby in the profile grooves 9 of the support body 10 and in the profile grooves 6 of the holder 3 and on the profile grooves 6 continuing tooth surfaces of the powder metal blank 1 from. In the 3 and 4 the position of the pusher tool 7 is shown immediately before and after the compression of the teeth of the powder metal blank 1. Like this 3 and 4 can be removed, the cage 11 formed by the punch 12 and 13 is moved with the profile rollers 8 in the direction of the mandrel axis, so that a substantially slip-free rolling movement of the profile rollers 8 is ensured on the powder metal blank 1. By a delay or acceleration of the cage 11, the rolling movement of the profile rollers 8 can be superimposed on a sliding movement. This superposition requires an additional sliding friction in the area of the powder metal blank 1, with the aid of which influence can be exerted on the compaction process.

Die Erfindung ist selbstverständlich nicht auf das Ausführungsbeispiel beschränkt. So könnte der Käfig 11 aus einem die Profilrollen 8 aufnehmenden Gestell bestehen. Außerdem ist wegen der gleichzeitigen Bearbeitung aller Zähne des Pulvermetallrohlings 1 durch einen geschlossenen Kranz von Profilrollen 8 das Vorsehen eines Dornes 2 zur radialen Abstützung des Pulvermetallrohlings 1 nicht zwingend. Außerdem kann die Teilung der Profilrollen von der Zahnteilung abweichen, beispielsweise weil eine Profilrolle für zwei Zähne zum Einsatz kommt oder für die Zahnlücken und die Zahnköpfe gesonderte Profilrollen verwendet werden. Schließlich ist darauf hinzuweisen, daß unter dem verwendeten Begriff "Zahnrad" nicht nur aufeinander abwälzende Zahnräder, sondern auch Kettenräder oder Räder mit einer Steckverzahnung zu verstehen sind. Die Erfindung kann ja für die Bearbeitung aller Werkstücke eingesetzt werden, die über den Umfang verteilte, zahnartige Ansätze aufweisen.The invention is of course not limited to the embodiment. Thus, the cage 11 may consist of a profile rollers 8 receiving frame. In addition, because of the simultaneous processing of all teeth of the powder metal blank 1 by a closed ring of profile rollers 8, the provision of a mandrel 2 for radial support of the powder metal blank 1 is not mandatory. In addition, the pitch of the profile rollers may differ from the tooth pitch, for example, because a profile roller for two teeth is used or for the tooth spaces and the tooth heads separate profile rollers are used. Finally, it should be noted that under the term "gear" used not only successive rolling gears, but also sprockets or wheels are to be understood with a spline. The invention can indeed be used for the processing of all workpieces that have distributed over the circumference, have tooth-like projections.

Claims (6)

  1. Method for producing a toothed wheel from a powdered metal blank which is compressed and sintered having a machining allowance in the toothing area, wherein the powdered metal blank is compacted in the area of the machining allowance by rolling of a compression tool forming a counter-toothing engaging into the toothing of the powdered metal blank with a plastic deformation by the machining allowance, characterised in that the powdered metal blank is simultaneously compacted over the entire circumference by rolling of profile rolls forming the compression tool, said rolling occurring axially with respect to the powdered metal blank.
  2. Method as claimed in claim 1, characterised in that the profile rolls roll on the powdered metal blank with a predefinable slip.
  3. Device for producing a toothed wheel having a holder for a powdered metal blank of the toothed wheel, which blank is compressed and sintered having a machining allowance, and having at least one compression tool which forms a counter-toothing engaging into the toothing of the powdered metal blank, characterised in that the compression tool (7) comprises a closed collar of profile rolls (8) forming the counter-toothing, whose axes lie in a common plane perpendicular to the axis of the powdered metal blank (1), in that the profile rolls (8) are guided in profile grooves (9), parallel to the axis of the powdered metal blank (1), of a support body (10) enclosing the profile rolls (8), and in that the axial holder (3) for the powdered metal blank (1) is coaxially displaceable in relation to the support body (10).
  4. Device as claimed in claim 3, characterised in that the profile rolls (8) are held in a cage (11) which is axially displaceable at a predefinable velocity in relation to the support body (10).
  5. Device as claimed in claim 3 or 4, characterised in that the axial holder (3) for the powdered metal blank (1) has two sections (4, 5) which accommodate the powdered metal blank (1) between them, and which form axial profile grooves (6), corresponding to the tooth gaps of the toothed wheel to be produced, for guiding the profile rolls (8).
  6. Device as claimed in any one of claims 3 to 5, characterised in that the profile rolls (8) of the compression tool (7) contact one another along front-end conical faces (14).
EP07718414.1A 2006-05-04 2007-04-27 Procedure for manufacturing a toothed wheel Not-in-force EP2012951B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0076306A AT503037B1 (en) 2006-05-04 2006-05-04 Manufacturing a toothed wheel made of a pressed and sintered powder metal blank, comprises compressing the powder metal blanks by unwinding a compression tool under a plastic deformation
PCT/AT2007/000198 WO2007128013A1 (en) 2006-05-04 2007-04-27 Procedure for manufacturing a toothed wheel

Publications (2)

Publication Number Publication Date
EP2012951A1 EP2012951A1 (en) 2009-01-14
EP2012951B1 true EP2012951B1 (en) 2017-10-18

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EP07718414.1A Not-in-force EP2012951B1 (en) 2006-05-04 2007-04-27 Procedure for manufacturing a toothed wheel

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US (1) US8069696B2 (en)
EP (1) EP2012951B1 (en)
JP (1) JP2009536268A (en)
CN (1) CN101489701B (en)
AT (1) AT503037B1 (en)
CA (1) CA2651016A1 (en)
WO (1) WO2007128013A1 (en)

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DE102008017608B3 (en) * 2008-04-06 2009-04-30 Aweba Werkzeugbau Gmbh Aue Internally and externally toothed cup-shaped sheet metal part e.g. cup shaped clutch plate support, producing method for use in forming press, involves adjusting target profile at open end of sheet metal parts by pressure discharge
JP5446612B2 (en) * 2009-08-28 2014-03-19 Ｔｄｋ株式会社 Lithium ion secondary battery
DE102012214870A1 (en) * 2012-08-22 2014-02-27 Schaeffler Technologies AG & Co. KG Drive wheel, has opening for retaining shaft, teeth formed at peripheral surface of wheel using rolling method, and carrier body arranged at peripheral surface of wheel, where wheel is designed as thin-walled circular blank
EP3082428A4 (en) 2013-12-09 2017-08-02 Respira Therapeutics, Inc. Pde5 inhibitor powder formulations and methods relating thereto
DE102014002219B4 (en) * 2014-02-21 2015-12-10 Gkn Sinter Metals Engineering Gmbh Method and device for producing a toothed wheel together with clamping means
DE102016102429B4 (en) 2016-02-11 2021-02-11 Ecoroll Ag Werkzeugtechnik Rolling device for rolling workpieces with toothing and the associated process
CN108246941A (en) * 2016-12-29 2018-07-06 财团法人金属工业研究发展中心 The molding machine and its manufacturing method of gear
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CN101489701B (en) 2010-12-08
AT503037A4 (en) 2007-07-15
WO2007128013A1 (en) 2007-11-15
US8069696B2 (en) 2011-12-06
EP2012951A1 (en) 2009-01-14
AT503037B1 (en) 2007-07-15
JP2009536268A (en) 2009-10-08
US20090090154A1 (en) 2009-04-09
CA2651016A1 (en) 2007-11-15
CN101489701A (en) 2009-07-22

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