EP1163961B1 - Method and apparatus for manufacturing a gearing element - Google Patents

Method and apparatus for manufacturing a gearing element Download PDF

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Publication number
EP1163961B1
EP1163961B1 EP01102425A EP01102425A EP1163961B1 EP 1163961 B1 EP1163961 B1 EP 1163961B1 EP 01102425 A EP01102425 A EP 01102425A EP 01102425 A EP01102425 A EP 01102425A EP 1163961 B1 EP1163961 B1 EP 1163961B1
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EP
European Patent Office
Prior art keywords
tool
blank
round blank
round
wall
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.)
Expired - Lifetime
Application number
EP01102425A
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German (de)
French (fr)
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EP1163961B2 (en
EP1163961A1 (en
Inventor
Rudolf Jaschka
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.)
Leifeld Metal Spinning GmbH
Original Assignee
Leico GmbH and Co Werkzeugmaschinenbau
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Application filed by Leico GmbH and Co Werkzeugmaschinenbau filed Critical Leico GmbH and Co Werkzeugmaschinenbau
Publication of EP1163961A1 publication Critical patent/EP1163961A1/en
Publication of EP1163961B1 publication Critical patent/EP1163961B1/en
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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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/28—Making other particular articles wheels or the like gear wheels
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/261—Making other particular articles wheels or the like pulleys

Definitions

  • the invention relates on the one hand to a method for the production a gear part with a hub from a round blank, which on a tool of a rotating drivable spindle Pressing machine is arranged and clamped and by means of at least one pressure roller reduces the thickness of the round blank and the resulting material is transformed into a hub becomes.
  • the invention relates to a pushing device with a rotating drivable spindle, at least one adjustable spinning roller and one attached to the spindle Tool for holding a round blank.
  • a generic method and a generic device can be seen, for example, from DE-C-198 49 981.
  • the blank is against an annular tool by means of a cylindrical one Pressing element pressed.
  • axial clamping can be an outer area of a Ronde can be processed very well.
  • axial clamping can, however, be within the trainee Do not avoid a certain radial disc area, which may be in a later step must be removed.
  • a device with a separate Abutment chuck is further apparent from DE-C-44 44 526. The abutment chuck that works with the tool can be placed on the circumferential edge of the round blank.
  • a method is known from EP-A-0 815 983 and US-A-5,987,952 known in which a circular blank is inserted into a receptacle and is axially clamped by means of a central pressure element.
  • a holding roller holds the while the hub is being formed outer edge of the blank in the picture. The holding roll hinders free access to the center of the round blank.
  • the invention is based on the object of specifying a method and a device with which simple and reliable holding of the workpiece on the tool is provided, at the same time ensuring a high degree of design freedom when forming the hub.
  • the task is accomplished on the one hand by a procedure with the Features of claim 1 solved. On the other hand, the task is performed by a device with the features of claim 10 solved.
  • the method according to the invention is characterized in that that the circular blank is clamped by axial pressure of a blank area of the blank against the tool and simultaneously expanding the circular blank radially and that when expanding the circular blank radially this against an annular circumferential direction Wall is formed on the tool, the round blank non-positively and / or positively held on the tool becomes.
  • a basic idea of the invention is the tool to be provided with an annular wall, which only slightly is larger than the blank used in it.
  • the Ronde is then replaced by a axial contact force radially expanded and thus against the annular wall either radially outwards or radially shaped inside. This results in a force and / or positive connection between the blank and the tool.
  • the blank is then clamped to the tool through an interaction between the formed blank and the surrounding annular wall or a central centering pin reached on the tool.
  • the device can thus be trained easily and inexpensively, the whole Area of the circular blank machined free from the spinning roller can be. It is a particularly high degree of design freedom given for machining the round blank and for the hub.
  • the with the exception of the pressure element basically be constructed as in the the applicant declining DE 198 49 981 C1 is described.
  • the ring-shaped heel can be this embodiment directly on the front of the Be trained tool.
  • the circumferential edge of the face of the tool with a chamfer can be provided, which in turn in the axially preceding paragraph transforms.
  • the outer edge region of the round blank in the axial direction be reshaped, the bevel angle being the bend angle of the edge area of the circular blank.
  • the shoulder is dimensioned in the axial direction so that it is preferably over the face of the tool survives.
  • a preferred development of the invention consists in that reducing the thickness of the blank by radial feeding a spinning roller, the spinning roller at the same time the blank with a defined axial force presses axially against the tool.
  • the spinning roller thus also has an axial force component on which a non-rotatable connection between the blank and the tool supported.
  • a particularly reliable process sequence is the subject of the invention in that until the generation of the Force and / or form-fit the blank using a separate Holding device, in particular a magnetic clamping device or a vacuum chuck on the tool is held.
  • a separate Holding device in particular a magnetic clamping device or a vacuum chuck on the tool
  • a controllable Electromagnetic coil on the tool or the arrangement of Vacuum channels on the tool open to the workpiece, which are a vacuum generator connected to the line the round blank can be inserted into the ring Tool can be fixed.
  • the final clamping takes place then according to the invention by pressing the pressure roller and reshaping the edge area of the circular blank in an axial Undercut area and / or radial driver element on the ring-shaped wall of the tool.
  • the pressing element Support hub material when molding the hub.
  • the pressing element is designed so that the outer contour of the pressing element has an area that corresponds to an area the inner contour of the hub to be formed corresponds.
  • the pressing element is used in this embodiment So as a tool mandrel, with the help of the inner contour of the This is how the hub is preformed while the hub is being shaped is that at most a comparatively minor Reworking the hub is required.
  • the pressing element with one from the front protruding pin of the tool engages, through a receiving opening formed on the round blank protrudes. After the radial expansion to hold the blank on The pressing element is moved away by the tool.
  • the pin provided on the tool the hub material support when shaping the hub similar to the previous one described embodiment, the outer contour of the pin has an area that corresponds to an area of the inner contour corresponds to the hub to be formed, so that here too at best a slight reworking of the hub a later date is required.
  • an annular, in Circumferential direction wall is formed on the the blank by radial expansion non-positively and / or positively is mountable, and that an ejector device is provided.
  • the ring-shaped wall of the tool points an inner diameter which is slightly larger than the outer diameter of the round blank is such that an almost backlash-free insertion of the blank is granted.
  • This annular wall will position the exact location Ronde reached on the spindle, being by radial expansion the blank is a non-positive and / or positive, non-rotatable connection of the circular blank with the tool and thus can be generated with the spindle.
  • the ejector device which in particular an axially movable stamp or a support element allows the round blank to be removed easily.
  • the wall is formed on an annular shoulder, the axially with respect to the end face of the tool protrudes. It is also possible to on the front of the Tool form a circumferential groove, the one groove wall at least partially the one running in the circumferential direction Wall forms.
  • the profiling can be in an axial undercut or in the arrangement of radially directed driver elements formed along the inside of the annular wall his.
  • the driver elements can have a toothing, in particular form spur gear teeth on the workpiece.
  • the driver elements run in the axial direction trained that an ejector axially the workpiece can remove the tool.
  • Fig. 1 shows a sectional view of a first embodiment a pressing device 10 for producing a Gear part 12 with hub 14 from a blank 16.
  • the pressing device 10 is in Fig. 1 in various stages of the process shown. So shows the left of the axis of rotation R of the pushing device 10 can be seen the Pushing device 10 when tensioning the blank 16. The right the view seen from the axis of rotation R shows the Pushing device 10 during the molding of the hub 14.
  • the pressing device 10 has a tool 18, which by means of a drive, not shown, about the axis of rotation R is rotatable.
  • a groove 22 is formed concentrically to the axis of rotation R.
  • a groove wall 24 with a greater radial distance from Rotation axis R runs at least approximately parallel to Axis of rotation R and forms a wall, the purpose of which later will be explained later.
  • An inner groove wall 26 with less radial distance to the axis of rotation R goes under formation a curve in the end face 20.
  • the embodiment is the outer groove wall 24 distance smoothly formed.
  • outer groove wall 24 shaped elements such as teeth, grooves or similar form, to form fit with the one to be formed later Manufacture blank 16.
  • the Groove base of the groove 22 provided with corresponding shaped elements his.
  • the tool 18 is also concentric to the axis of rotation R a cylindrical ejector 28 is slidably received, with which the finished transmission part 12 after completion of the pressure rolling process can be released from the tool 18.
  • a center hole is also concentric to the axis of rotation R. 30 formed in the ejector 28, which is for receiving a centering pin 32 of a holding element 34 serves, as Fig. 1 shows.
  • the holding element 34 has one adjoining the centering pin 32 supporting section 36 with a round cross-section, which in turn in a holding device 38 passes.
  • the pressing device 10 For shaping the hub 14, the pressing device 10 a spinning roller 40, which in a common rotation of the tool 18 with the holding element 34 radially in the direction is delivered to the center of the blank 16.
  • the Press roller 40 has a cutting edge 42, the to the cutting edge 42 adjacent peripheral surfaces of the Pinch roller 40 at an acute angle.
  • To the Cutting edge 42 is followed by a compression area 44 which in turn limited by a projection 46 of the spinning roller 40 is.
  • the blank is first 16 attached to the end face 20 of the tool 18 and that axially movable holding element 34 against the end face 20 moved so that the centering pin 32 by one on the Ronde 16 trained receiving opening 48 is guided and enters the centering mold 30.
  • the holding element 34 is thereby moved axially in the direction of the end face 20, that at the transition between the centering pin 32 and the Support portion 36 formed paragraph 50 on the front the blank 16 abuts and so the blank 16 against the tool 18 preloaded.
  • the tool 18 and the holding element 34 is rotated and the spinning roller 40 delivered, whereby the circular blank 16 extends radially and molded into the groove 22 with its edge region becomes. In this way, the blank 16 is non-positively the end face 20 of the tool 18 clamped.
  • the pressure roller 40 becomes radial in the direction of the axis of rotation R moves, the cutting edge 40 with the Round 16 comes into engagement.
  • the radial delivery of the Press roller 40 is partially separated material from the blank 16 and guided along the compression area 44 so that starting from the round blank 16, a revolving, while of the delivery process always changing collar.
  • the axial flow of material is through the projection 46 Press roller 40 limited.
  • the hub 14 turns on the gear part 12 to be manufactured from the blank 16 is formed, the holding element 34 serves as a tool mandrel the transition between the centering pin 32 and the Support section 36, on which the hub 14 is formed, at least partly for shaping the later inner contour Inner contour of the hub 14 is used.
  • the spinning roller 40 moved away from the forming point, the holding element 34 Move away from tool 18 and then the finished one Gear part 12 using ejector 28 from tool 18 solved. This will release the finished gear part 12 due to the curvature on the groove wall 26 with little radial Distance easier because of the edge area of the gear part 12 is also rounded at the bottom.
  • FIGS. 2 and 3 show a second embodiment a pushing device 60, which is essentially constructed the structure of the pressing device 10 of the first embodiment like.
  • the pushing device 60 differentiates only compared to the pressing device 10 the ejector 62 used and the holding element used 64.
  • the pressing device 60 is from the front the ejector 62 axially from a centering pin 66, the arranged concentrically to the axis of rotation R of the tool 18 is.
  • the holding element 64 also has a concentric centering opening formed to the axis of rotation R. 68 with which the centering pin 66 engages can be brought, as Figure 2 shows.
  • the blank 16 is also its receiving opening 48 initially on the centering pin 66 placed. Then the holding element 64 is against the tool 18 moves, the centering opening 68 with the centering pin 66 comes into engagement.
  • the holding element 64 is biased axially against the tool 18 so strongly that the blank 16 rotatably. with the tool 18 and the holding element 64 is connected. Then the tool 18 and the holding element 64 in rotation and how in the first embodiment, using the spinning roller 40 the blank 16 is initially expanded radially. Through the radial Widening the circular blank 18 is molded into the groove 22, so that there is a positive connection between the blank 16 and the tool 18 forms.
  • the centering pin 66 is used here as a tool mandrel for the hub 14 to be formed appropriate design of the centering pin 66 can this way, a hub 14 can be formed, the one Has through hole with a constant diameter.
  • a pushing device can be designed in accordance with the invention.
  • previously described pushing devices additionally with magnetic clamping device or vacuum clamping devices.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The part is formed from a round blank, which is clamped in a tool and reduced in thickness by a pressure roller moving in a radial direction. The blank is clamped by pressing an edge section axially against the tool and simultaneous radial expansion of the blank against a ring-shaped axially projecting part of the tool. The blank is held non-positively and/or positively on the tool, by esp. a magnetic or vacuum clamping device until the clamping force is generated.

Description

Die Erfindung betrifft zum einen ein Verfahren zur Herstellung eines Getriebeteiles mit Nabe aus einer Ronde, welche an einem Werkzeug einer rotierend antreibbaren Spindel einer Drückmaschine angeordnet und eingespannt wird und mittels mindestens einer Drückrolle eine Dicke der Ronde verringert und das dabei anfallende Material zur Nabe umgeformt wird.The invention relates on the one hand to a method for the production a gear part with a hub from a round blank, which on a tool of a rotating drivable spindle Pressing machine is arranged and clamped and by means of at least one pressure roller reduces the thickness of the round blank and the resulting material is transformed into a hub becomes.

Zum anderen betrifft die Erfindung eine Drückvorrichtung mit einer rotierend antreibbaren Spindel, mindestens einer zustellbaren Drückrolle und einem an der Spindel angebrachten Werkzeug zum Haltern einer Ronde.On the other hand, the invention relates to a pushing device with a rotating drivable spindle, at least one adjustable spinning roller and one attached to the spindle Tool for holding a round blank.

Ein gattungsgemäßes Verfahren und eine gattungsgemäße Vorrichtung gehen beispielsweise aus der DE-C-198 49 981 hervor. Bei diesem bekannten Drückverfahren wird die Ronde gegen ein ringförmiges Werkzeug mittels eines zylinderförmigen Andrückelementes gedrückt. Bei dieser einfachen und zuverlässigen axialen Einspannung kann ein Aussenbereich einer Ronde sehr gut bearbeitet werden. Bei dieser axialen Einspannung lässt sich jedoch innerhalb der auszubildenden Nabe ein gewisser radialer Scheibenbereich nicht vermeiden, welcher gegebenenfalls in einem späteren Arbeitsschritt entfernt werden muss. Eine Vorrichtung mit einem separaten Widerlagerfutter geht weiter aus der DE-C-44 44 526 hervor. Das mit dem Werkzeug zusammenarbeitende Widerlagerfutter ist dabei an die Umfangskante der Ronde anlegbar.A generic method and a generic device can be seen, for example, from DE-C-198 49 981. In this known pressing method, the blank is against an annular tool by means of a cylindrical one Pressing element pressed. With this simple and reliable axial clamping can be an outer area of a Ronde can be processed very well. With this axial clamping can, however, be within the trainee Do not avoid a certain radial disc area, which may be in a later step must be removed. A device with a separate Abutment chuck is further apparent from DE-C-44 44 526. The abutment chuck that works with the tool can be placed on the circumferential edge of the round blank.

Beim Anformen einer Nabe an einer Blechronde ist es weiter bekannt, diese durch sogenannte Drehfutter an ihrem Außenumfang an einem Werkzeug einzuspannen. Das Drehfutter weist dabei drei oder vier radial verstellbare Spannbacken auf, zwischen denen das rondenförmige Werkstück gespannt werden kann. Allerdings sind derartige Spanneinrichtungen relativ aufwendig und behindern teilweise auch das Bearbeiten der Ronde mittels Drückrollen. Bei relativ dünnen Werkstücken kann zu einem entsprechend dünnen Umfangsrand kein ausreichender Spannbereich für eine zuverlässige Klemmung des Werkstückes vorhanden sein.It is a step further when molding a hub onto a sheet metal blank known, this by so-called lathe chucks on its outer circumference clamped on a tool. The lathe chuck points three or four radially adjustable jaws, between which the circular workpiece is clamped can. However, such tensioners are relative complex and sometimes hinder the editing of Round plate using spinning rollers. For relatively thin workpieces can not be sufficient to a correspondingly thin peripheral edge Clamping range for reliable clamping of the Workpiece.

Aus der EP-A-0 815 983 und der US-A-5,987,952 sind ein Verfahren bekannt, bei dem eine Ronde in eine Aufnahme eingelegt und mittels eines mittigen Andrückelementes axial festgespannt wird. Während des Anformens der Nabe hält eine Halterolle den aüßeren Rand der Ronde in der Aufnahme. Die Halterolle behindert einen freien Zugang zur Mitte der Ronde.A method is known from EP-A-0 815 983 and US-A-5,987,952 known in which a circular blank is inserted into a receptacle and is axially clamped by means of a central pressure element. A holding roller holds the while the hub is being formed outer edge of the blank in the picture. The holding roll hinders free access to the center of the round blank.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung anzugeben, mit denen ein einfaches und zuverlässiges Halten des Werkstücks am Werkzeug gegeben ist, wobei gleichzeitig eine hohe Gestaltungsfreiheit beim Ausbilden der Nabe sichergestellt ist.The invention is based on the object of specifying a method and a device with which simple and reliable holding of the workpiece on the tool is provided, at the same time ensuring a high degree of design freedom when forming the hub.

Die Aufgabe wird zum einen durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Zum anderen wird die Aufgabe durch eine Vorrichtung mit den Merkmalen des Anspruchs 10 gelöst.The task is accomplished on the one hand by a procedure with the Features of claim 1 solved. On the other hand, the task is performed by a device with the features of claim 10 solved.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass das Einspannen der Ronde durch axiales Andrücken eines Rondenbereiches der Ronde gegen das Werkzeug und gleichzeitiges radiales Erweitern der Ronde durchgeführt wird und dass beim radialen Erweitern der Ronde diese gegen eine ringförmige, in Umfangsrichtung verlaufende Wand an dem Werkzeug geformt wird, wobei die Ronde kraft- und/ oder formschlüssig an dem Werkzeug gehaltert wird. The method according to the invention is characterized in that that the circular blank is clamped by axial pressure of a blank area of the blank against the tool and simultaneously expanding the circular blank radially and that when expanding the circular blank radially this against an annular circumferential direction Wall is formed on the tool, the round blank non-positively and / or positively held on the tool becomes.

Ein Grundgedanke der Erfindung besteht darin, das Werkzeug mit einer ringförmigen Wand zu versehen, welche nur geringfügig größer als die darin eingesetzte Ronde ist. Die Ronde wird dann zu Beginn des Umformverfahrens durch eine axiale Anpresskraft radial erweitert und so gegen die ringförmige Wand entweder radial nach außen oder radial nach innen geformt. Es ergibt sich so eine kraft- und/oder formschlüssige Verbindung zwischen der Ronde und dem Werkzeug. Die Einspannung der Ronde an dem Werkzeug wird also durch eine Interaktion zwischen der umgeformten Ronde und der umgebenden ringförmigen Wand oder einem mittigen Zentrierdorn am Werkzeug erreicht. Die Vorrichtung kann somit einfach und kostengünstig ausgebildet werden, wobei der gesamte Bereich der Ronde frei von der Drückrolle bearbeitet werden kann. Es ist so eine besonders hohe Gestaltungsfreiheit zur Bearbeitung der Ronde und zur Nabe gegeben. Die hierzu einsetzbare Drückmaschine kann mit Ausnahme des Andrückelementes grundsätzlich so aufgebaut sein, wie in der auf die Anmelderin zurückgehenden DE 198 49 981 C1 beschrieben ist.A basic idea of the invention is the tool to be provided with an annular wall, which only slightly is larger than the blank used in it. The Ronde is then replaced by a axial contact force radially expanded and thus against the annular wall either radially outwards or radially shaped inside. This results in a force and / or positive connection between the blank and the tool. The blank is then clamped to the tool through an interaction between the formed blank and the surrounding annular wall or a central centering pin reached on the tool. The device can thus be trained easily and inexpensively, the whole Area of the circular blank machined free from the spinning roller can be. It is a particularly high degree of design freedom given for machining the round blank and for the hub. The with the exception of the pressure element basically be constructed as in the the applicant declining DE 198 49 981 C1 is described.

Bei einer bevorzugten Ausführungsform der Erfindung ist die in Umfangsrichtung verlaufende Wand von einem ringförmigen Absatz gebildet, der bezüglich der Stirnseite des Werkzeuges, gegen die die Ronde beim radialen Erweitern gedrückt wird, axial vorsteht. Der ringförmige Absatz kann bei dieser Ausführungsform unmittelbar an der Stirnseite des Werkzeugs ausgebildet sein. Alternativ ist es auch möglich, die Umlaufkante der Stirnseite des Werkzeugs mit einer Fase zu versehen, die ihrerseits in den axial vorstehenden Absatz übergeht. Durch eine derartige Gestaltung des Absatzes kann der äußere Randbereich der Ronde in axialer Richtung umgeformt werden, wobei der Fasenwinkel die Biegungswinkel des Randbereiches der Ronde vorgibt. Dadurch ergibt sich der Vorteil, dass die Ronde nach dem Drückwalzen besonders leicht, d. h. ohne großen Kraftaufwand, vom Werkzeug gelöst werden kann. Der Absatz ist in axialer Richtung so bemessen, dass er vorzugsweise über die Stirnseite des Werkzeugs übersteht.In a preferred embodiment of the invention, the circumferential wall of an annular Paragraph formed with respect to the face of the tool, against which the circular blank is pressed when expanding radially protrudes axially. The ring-shaped heel can be this embodiment directly on the front of the Be trained tool. Alternatively, it is also possible the circumferential edge of the face of the tool with a chamfer to be provided, which in turn in the axially preceding paragraph transforms. Through such a design of the paragraph can the outer edge region of the round blank in the axial direction be reshaped, the bevel angle being the bend angle of the edge area of the circular blank. This results in the advantage that the blank is special after spinning easy, d. H. detached from the tool with little effort can be. The shoulder is dimensioned in the axial direction so that it is preferably over the face of the tool survives.

Des Weiteren wird vorgeschlagen, an der Stirnseite des Werkzeuges, gegen die die Ronde beim radialen Erweitern gedrückt wird, eine umlaufende Nut auszubilden, deren eine ringförmige Nutwand zumindest teilweise die in Umfangsrichtung verlaufende Wand bildet. Die Ronde wird zum Halten mit ihrem Randbereich in die Nut auf der ebenen Werkzeugfläche derart eingeformt, dass die Ronde kraft- und/oder formschlüssig an der Nutwand gehalten ist. Bei dieser Ausführungsform ist es ferner denkbar, gleichfalls den zuvor beschriebenen Absatz am Werkzeug vorzusehen, wobei der Absatz mit seiner in die Umfangsrichtung verlaufende Wand bildenden Innenseite in die ringförmige Nutwand übergeht.Furthermore, it is proposed at the front of the Tool against which the circular blank is pressed during radial expansion will form a circumferential groove, one of which annular groove wall at least partially in the circumferential direction trending wall forms. The round plate is used to hold its edge area into the groove on the flat tool surface molded in such a way that the blank is non-positive and / or positive is held on the groove wall. In this embodiment it is also conceivable, likewise those previously described Provide paragraph on the tool, the paragraph with its wall running in the circumferential direction Merges into the annular groove wall on the inside.

Eine bevorzugte Weiterbildung der Erfindung besteht darin, dass das Verringern der Dicke der Ronde durch radiales Zustellen einer Drückrolle erfolgt, wobei die Drückrolle gleichzeitig die Ronde mit einer definierten Axialkraft axial gegen das Werkzeug drückt. Neben einer Radialkraftkomponente weist somit die Drückrolle auch eine Axialkraftkomponente auf, welche eine drehfeste Verbindung zwischen der Ronde und dem Werkzeug unterstützt.A preferred development of the invention consists in that reducing the thickness of the blank by radial feeding a spinning roller, the spinning roller at the same time the blank with a defined axial force presses axially against the tool. In addition to a radial force component the spinning roller thus also has an axial force component on which a non-rotatable connection between the blank and the tool supported.

Ein besonders betriebssicherer Verfahrensablauf wird erfindungsgemäß dadurch erreicht, dass bis zum Erzeugen des Kraft- und/oder Formschlusses die Ronde mittels einer separaten Halteeinrichtung, insbesondere einer Magnetspanneinrichtung oder einer Vakuumspanneinrichtung, an dem Werkzeug gehalten wird. Durch die Anordnung einer ansteuerbaren Elektromagnetspule an dem Werkzeug oder der Anordnung von zum Werkstück hin offenen Vakuumkanälen am Werkzeug, die mit einer Unterdruckerzeugungseinrichtung leitungsverbunden sind, kann die Ronde nach dem Einsetzen in das ringförmige Werkzeug fixiert werden. Die endgültige Einspannung erfolgt dann erfindungsgemäß durch das Andrücken der Drückrolle und das Umformen des Randbereiches der Ronde in einem axialen Hinterschneidungsbereich und/oder radialen Mitnehmerelement an der ringförmigen Wand des Werkzeuges.A particularly reliable process sequence is the subject of the invention in that until the generation of the Force and / or form-fit the blank using a separate Holding device, in particular a magnetic clamping device or a vacuum chuck on the tool is held. By arranging a controllable Electromagnetic coil on the tool or the arrangement of Vacuum channels on the tool open to the workpiece, which are a vacuum generator connected to the line the round blank can be inserted into the ring Tool can be fixed. The final clamping takes place then according to the invention by pressing the pressure roller and reshaping the edge area of the circular blank in an axial Undercut area and / or radial driver element on the ring-shaped wall of the tool.

Wird keine separate Halteeinrichtung verwendet, ist es sinnvoll, dass die auf das Werkzeug aufgesetzte Ronde bei noch stillstehender Spindel axial mit der mindestens einen Drückrolle gegen das Werkzeug gedrückt wird. Erst in dieser angedrückten Stellung kann die Spindel zusammen mit dem Werkzeug und der Ronde in Rotation versetzt werden, wobei sich die Drückrolle aufgrund des Reibungskontaktes entsprechend mit der Ronde mitdreht und diese zuverlässig an das Werkzeug andrückt.If no separate holding device is used, it is it makes sense that the blank placed on the tool at still stationary spindle axially with the at least one Pressure roller is pressed against the tool. Only in this pressed position, the spindle together with the Tool and the blank are set in rotation, whereby the pressure roller due to the frictional contact rotates with the blank and this reliably to the Tool presses.

Des Weiteren wird bei einer bevorzugten Ausführungsform des Verfahrens vorgeschlagen, die Ronde zumindest während des Ausformens der Nabe mit Hilfe eines Andrückelementes axial an das Werkzeug zu drücken, wobei das Andrückelement den Nabenwerkstoff beim Ausformen der Nabe abstützt. Das Andrückelement ist dabei so gestaltet, dass die Außenkontur des Andrückelementes einen Bereich aufweist, der einem Bereich der Innenkontur der auszuformenden Nabe entspricht. Das Andrückelement dient bei diesem Ausführungsbeispiel also als Werkzeugdorn, mit dessen Hilfe die Innenkontur der Nabe bereits so während des Ausformens der Nabe vorgeformt wird, dass allenfalls eine vergleichsweise geringfügige Nachbearbeitung der Nabe erforderlich wird. Furthermore, in a preferred embodiment of the Proposed procedure, at least during the Form the hub axially with the help of a pressure element to press the tool, the pressing element Support hub material when molding the hub. The pressing element is designed so that the outer contour of the pressing element has an area that corresponds to an area the inner contour of the hub to be formed corresponds. The pressing element is used in this embodiment So as a tool mandrel, with the help of the inner contour of the This is how the hub is preformed while the hub is being shaped is that at most a comparatively minor Reworking the hub is required.

Bei einer alternativen Ausführungsform des Verfahrens wird vorgeschlagen, die Ronde bereits vor dem radialen Erweitern mit Hilfe eines Andrückelementes axial an das Werkzeug zu drücken, wobei das Andrückelement mit einem von der Stirnseite des Werkzeugs abstehenden Zapfen in Eingriff kommt, der durch eine an der Ronde ausgebildete Aufnahmeöffnung ragt. Nach dem radialen Erweitern zum Haltern der Ronde am Werkzeug wird das Andrückelement wegbewegt. Auf diese Weise kann der am Werkzeug vorgesehene Zapfen den Nabenwerkstoff beim Ausformen der Nabe abstützen, wobei ähnlich der zuvor beschriebenen Ausführungsform die Außenkontur des Zapfens einen Bereich aufweist, der einem Bereich der Innenkontur der auszuformenden Nabe entspricht, so dass auch hier allenfalls eine geringfügige Nachbearbeitung der Nabe zu einem späteren Zeitpunkt erforderlich ist. Hinsichtlich der Vorrichtung wird die Aufgabe erfindungsgemäß dadurch gelöst, dass am Werkzeug eine ringförmige, in Umfangsrichtung verlaufende Wand ausgebildet ist, an der die Ronde durch radiales Erweitern kraft- und/oder formschlüssig halterbar ist, und dass eine Ausstoßereinrichtung vorgesehen ist. Die ringförmige Wand des Werkzeuges weist einen Innendurchmesser auf, welcher geringfügig größer als der Außendurchmesser der Ronde ist, so dass eine nahezu spielfreie Aufnahme der Ronde gewährt ist. Durch diese ringförmige Wand wird eine genaue Lagepositionierung der Ronde an der Spindel erreicht, wobei durch das radiale Erweitern der Ronde eine kraft- und/oder formschlüssige, drehfeste Verbindung der Ronde mit dem Werkzeug und damit mit der Spindel erzeugbar ist. Es ist somit auf einfache Weise eine feste und zugleich lagegenaue Einspannung eines rondenförmigen Werkstückes gegeben, wobei eine freie Bearbeitung der gesamten Rondenfläche auf einer Rondenseite ermöglicht ist. Die Ausstoßereinrichtung, welche insbesondere ein axial verfahrbarer Stempel oder ein Stützelement ist, erlaubt ein leichtes Entfernen der Ronde.In an alternative embodiment of the method proposed to expand the blank even before radial expansion with the help of a pressure element axially to the tool press, the pressing element with one from the front protruding pin of the tool engages, through a receiving opening formed on the round blank protrudes. After the radial expansion to hold the blank on The pressing element is moved away by the tool. In this way can the pin provided on the tool the hub material support when shaping the hub, similar to the previous one described embodiment, the outer contour of the pin has an area that corresponds to an area of the inner contour corresponds to the hub to be formed, so that here too at best a slight reworking of the hub a later date is required. With regard to the device, the object is achieved according to the invention solved by the fact that an annular, in Circumferential direction wall is formed on the the blank by radial expansion non-positively and / or positively is mountable, and that an ejector device is provided. The ring-shaped wall of the tool points an inner diameter which is slightly larger than the outer diameter of the round blank is such that an almost backlash-free insertion of the blank is granted. Through this annular wall will position the exact location Ronde reached on the spindle, being by radial expansion the blank is a non-positive and / or positive, non-rotatable connection of the circular blank with the tool and thus can be generated with the spindle. It is therefore simple A firm and at the same time precise positioning of one given a circular workpiece, with a free machining the entire round surface on one round side is possible. The ejector device, which in particular an axially movable stamp or a support element allows the round blank to be removed easily.

In einer bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung ist die Wand an einem ringförmigen Absatz ausgebildet, der bezüglich der Stirnseite des Werkzeuges axial vorsteht. Ferner ist es möglich, an der Stirnseite des Werkzeuges eine umlaufende Nut auszubilden, deren eine Nutwand zumindest teilweise die in Umfangsrichtung verlaufende Wand bildet.In a preferred embodiment of the invention Device the wall is formed on an annular shoulder, the axially with respect to the end face of the tool protrudes. It is also possible to on the front of the Tool form a circumferential groove, the one groove wall at least partially the one running in the circumferential direction Wall forms.

Eine noch bessere Verbindung zwischen dem rondenförmigen Werkstück und dem Werkzeug auf der Spindel wird erfindungsgemäß dadurch erreicht, dass an einer zur Ronde gerichteten Umfangsseite der ringförmigen Wand eine Profilierung zur Herstellung eines Formschlusses ausgebildet ist. Die Profilierung kann in einer axialen Hinterschneidung oder in der Anordnung radial gerichteter Mitnehmerelemente entlang der Innenseite der ringförmigen Wand ausgebildet sein. Die Mitnehmerelemente können eine Verzahnung, insbesondere eine Stirnradverzahnung an dem Werkstück ausbilden. Die Mitnehmerelemente sind in Achsrichtung verlaufend ausgebildet, dass ein Auswerfer das Werkstück axial von dem Werkzeug entfernen kann. An even better connection between the round-shaped Workpiece and the tool on the spindle is invented achieved by facing towards the round blank Profiling of the circumferential side of the annular wall trained to produce a positive connection is. The profiling can be in an axial undercut or in the arrangement of radially directed driver elements formed along the inside of the annular wall his. The driver elements can have a toothing, in particular form spur gear teeth on the workpiece. The driver elements run in the axial direction trained that an ejector axially the workpiece can remove the tool.

Nachfolgend wird die Erfindung anhand mehrerer Ausführungsbeispiele unter Bezugnahme auf die schematische Zeichnung näher erläutert. Darin zeigen:

Fig. 1
eine Schnittansicht eines ersten Ausführungsbeispieles einer Drückvorrichtung mit einer an der Stirnseite des Werkzeuges ausgebildeten Nut;
Fig. 2
eine Schnittansicht eines zweiten Ausführungsbeispieles einer Drückvorrichtung mit einer an der Stirnseite des Werkzeuges ausgebildeten Nut und einem an der Stirnseite vorgesehenen Zentrierzapfens beim Spannen der Ronde; und
Fig. 3
eine Schnittansicht des zweiten Ausführungsbeispieles nach Fig. 2 beim Ausformen der Nabe.
The invention is explained in more detail below on the basis of several exemplary embodiments with reference to the schematic drawing. In it show:
Fig. 1
a sectional view of a first embodiment of a pressing device with a groove formed on the end face of the tool;
Fig. 2
a sectional view of a second embodiment of a pressing device with a groove formed on the end face of the tool and a centering pin provided on the end face when tensioning the round blank; and
Fig. 3
a sectional view of the second embodiment of FIG. 2 when molding the hub.

Fig. 1 zeigt eine Schnittansicht eines ersten Ausführungsbeispieles einer Drückvorrichtung 10 zur Herstellung eines Getriebeteils 12 mit Nabe 14 aus einer Ronde 16. Die Drückvorrichtung 10 ist in Fig. 1 in verschiedenen Verfahrensstadien dargestellt. So zeigt die links von der Rotationsachse R der Drückvorrichtung 10 zu sehende Darstellung die Drückvorrichtung 10 beim Spannen der Ronde 16. Die rechts von der Rotationsachse R zu sehende Darstellung zeigt die Drückvorrichtung 10 während des Ausformens der Nabe 14.Fig. 1 shows a sectional view of a first embodiment a pressing device 10 for producing a Gear part 12 with hub 14 from a blank 16. The pressing device 10 is in Fig. 1 in various stages of the process shown. So shows the left of the axis of rotation R of the pushing device 10 can be seen the Pushing device 10 when tensioning the blank 16. The right the view seen from the axis of rotation R shows the Pushing device 10 during the molding of the hub 14.

Die Drückvorrichtung 10 weist ein Werkzeug 18 auf, das mittels eines nicht dargestellten Antriebes um die Rotationsachse R drehbar ist. An der Stirnseite 20 des Werkzeugs 18 ist konzentrisch zur Rotationsachse R eine Nut 22 ausgebildet. Eine Nutwand 24 mit größerem radialen Abstand zur Rotationsachse R verläuft zumindest annähernd parallel zur Rotationsachse R und bildet eine Wand, deren Zweck später noch erläutert wird. Eine innere Nutwand 26 mit geringerem radialen Abstand zur Rotationsachse R geht unter Bildung einer Rundung in die Stirnseite 20 über. Im dargestellten Ausführungsbeispiel ist die äußere Nutwand 24 Abstandes glatt ausgebildet. Alternativ ist es auch möglich, an der äußeren Nutwand 24 Formelemente wie Zähne, Riefen o.Ä. auszubilden, um einen Formschluss mit der später auszuformenden Ronde 16 herzustellen. In gleicher Weise kann auch der Nutgrund der Nut 22 mit entsprechenden Formelementen versehen sein.The pressing device 10 has a tool 18, which by means of a drive, not shown, about the axis of rotation R is rotatable. On the end face 20 of the tool 18 a groove 22 is formed concentrically to the axis of rotation R. A groove wall 24 with a greater radial distance from Rotation axis R runs at least approximately parallel to Axis of rotation R and forms a wall, the purpose of which later will be explained later. An inner groove wall 26 with less radial distance to the axis of rotation R goes under formation a curve in the end face 20. In the illustrated The embodiment is the outer groove wall 24 distance smoothly formed. Alternatively, it is also possible to use the outer groove wall 24 shaped elements such as teeth, grooves or similar form, to form fit with the one to be formed later Manufacture blank 16. In the same way, the Groove base of the groove 22 provided with corresponding shaped elements his.

Konzentrisch zur Rotationsachse R ist im Werkzeug 18 ferner ein zylinderförmiger Ausstoßer 28 verschieblich aufgenommen, mit dem das fertige Getriebeteil 12 nach Beendigung des Drückwalzvorganges vom Werkzeug 18 gelöst werden kann. The tool 18 is also concentric to the axis of rotation R a cylindrical ejector 28 is slidably received, with which the finished transmission part 12 after completion of the pressure rolling process can be released from the tool 18.

Gleichfalls konzentrisch zur Rotationsachse R ist eine Zentrierbohrung 30 im Ausstoßer 28 ausgebildet, die zur Aufnahme eines Zentrierzapfens 32 eines Halteelementes 34 dient, wie Fig. 1 zeigt. Das Halteelement 34 weist einen sich an den Zentrierzapfen 32 anschließenden Stützabschnitt 36 mit rundem Querschnitt auf, der seinerseits in eine Haltevorrichtung 38 übergeht.A center hole is also concentric to the axis of rotation R. 30 formed in the ejector 28, which is for receiving a centering pin 32 of a holding element 34 serves, as Fig. 1 shows. The holding element 34 has one adjoining the centering pin 32 supporting section 36 with a round cross-section, which in turn in a holding device 38 passes.

Zum Ausformen der Nabe 14 weist die Drückvorrichtung 10 eine Drückrolle 40 auf, die bei einer gemeinsamen Rotation des Werkzeuges 18 mit dem Halteelement 34 radial in Richtung auf das Zentrum der Ronde 16 zugestellt wird. Die Drückrolle 40 weist eine Schneidkante 42 auf, wobei die an die Schneidkante 42 angrenzenden Umfangsflächen der Drückrolle 40 einen spitzen Winkel einschließen. An die Schneidkante 42 schließt sich ein Stauchbereich 44 an, der seinerseits von einem Vorsprung 46 der Drückrolle 40 begrenzt ist.For shaping the hub 14, the pressing device 10 a spinning roller 40, which in a common rotation of the tool 18 with the holding element 34 radially in the direction is delivered to the center of the blank 16. The Press roller 40 has a cutting edge 42, the to the cutting edge 42 adjacent peripheral surfaces of the Pinch roller 40 at an acute angle. To the Cutting edge 42 is followed by a compression area 44 which in turn limited by a projection 46 of the spinning roller 40 is.

Zum Ausformen des Getriebeteils 12 wird zunächst die Ronde 16 an die Stirnseite 20 des Werkzeugs 18 angesetzt und das axial bewegliche Halteelement 34 gegen die Stirnseite 20 bewegt, so dass der Zentrierzapfen 32 durch eine an der Ronde 16 ausgebildete Aufnahmeöffnung 48 geführt wird und in die Zentrierform 30 gelangt. Das Halteelement 34 wird dabei so weit axial in Richtung der Stirnseite 20 bewegt, dass der am Übergang zwischen dem Zentrierzapfen 32 und dem Stützabschnitt 36 gebildete Absatz 50 an der Vorderseite der Ronde 16 anliegt und so die Ronde 16 gegen das Werkzeug 18 vorspannt. Anschließend wird das Werkzeug 18 und das Halteelement 34 in Drehung versetzt und die Drückrolle 40 zugestellt, wodurch die Ronde 16 gezielt radial erweitert und mit ihrem Randbereich in die Nut 22 eingeformt wird. Auf diese Weise wird die Ronde 16 kraftschlüssig an der Stirnseite 20 des Werkzeuges 18 eingespannt.To form the gear part 12, the blank is first 16 attached to the end face 20 of the tool 18 and that axially movable holding element 34 against the end face 20 moved so that the centering pin 32 by one on the Ronde 16 trained receiving opening 48 is guided and enters the centering mold 30. The holding element 34 is thereby moved axially in the direction of the end face 20, that at the transition between the centering pin 32 and the Support portion 36 formed paragraph 50 on the front the blank 16 abuts and so the blank 16 against the tool 18 preloaded. Then the tool 18 and the holding element 34 is rotated and the spinning roller 40 delivered, whereby the circular blank 16 extends radially and molded into the groove 22 with its edge region becomes. In this way, the blank 16 is non-positively the end face 20 of the tool 18 clamped.

Danach wird die Drückrolle 40 radial in Richtung der Rotationsachse R bewegt, wobei die Schneidkante 40 mit der Ronde 16 in Eingriff kommt. Durch das radiale Zustellen der Drückrolle 40 wird Material der Ronde 16 teilweise abtrennt und entlang des Stauchbereiches 44 geleitet, so dass sich, ausgehend von der Ronde 16, ein umlaufender, sich während des Zustellvorganges stets verändernder Kragen ausbildet. Der axiale Materialfluss ist durch den Vorsprung 46 der Drückrolle 40 begrenzt. Auf diese Weise wird die Nabe 14 an dem aus der Ronde 16 zu fertigenden Getriebeteil 12 ausgeformt, wobei das Halteelement 34 als Werkzeugdorn dient dessen Übergang zwischen dem Zentrierzapfen 32 und dem Stützabschnitt 36, an dem die Nabe 14 ausgeformt wird, zumindest teilweise zum Ausformen der späteren Innenkontur Innenkontur der Nabe 14 dient.Thereafter, the pressure roller 40 becomes radial in the direction of the axis of rotation R moves, the cutting edge 40 with the Round 16 comes into engagement. By the radial delivery of the Press roller 40 is partially separated material from the blank 16 and guided along the compression area 44 so that starting from the round blank 16, a revolving, while of the delivery process always changing collar. The axial flow of material is through the projection 46 Press roller 40 limited. In this way, the hub 14 turns on the gear part 12 to be manufactured from the blank 16 is formed, the holding element 34 serves as a tool mandrel the transition between the centering pin 32 and the Support section 36, on which the hub 14 is formed, at least partly for shaping the later inner contour Inner contour of the hub 14 is used.

Nachdem die Nabe 14 ausgeformt worden ist, wird die Drückrolle 40 von der Umformstelle wegbewegt, das Halteelement 34 vom Werkzeug 18 weg verfahren und anschließend das fertige Getriebeteil 12 mit Hilfe des Ausstoßers 28 vom Werkzeug 18 gelöst. Dabei wird das Lösen des fertigen Getriebeteils 12 durch die Rundung an der Nutwand 26 mit geringem radialen Abstand erleichtert, da der Randbereich des Getriebeteils 12 gleichfalls unten abgerundet ausgeformt ist.After the hub 14 is formed, the spinning roller 40 moved away from the forming point, the holding element 34 Move away from tool 18 and then the finished one Gear part 12 using ejector 28 from tool 18 solved. This will release the finished gear part 12 due to the curvature on the groove wall 26 with little radial Distance easier because of the edge area of the gear part 12 is also rounded at the bottom.

Die Fig. 2 und 3 zeigen ein zweites Ausführungsbeispiel einer Drückvorrichtung 60, die in ihrem Aufbau im Wesentlichen dem Aufbau der Drückvorrichtung 10 des ersten Ausführungsbeispiels gleicht. Die Drückvorrichtung 60 unterscheidet sich gegenüber der Drückvorrichtung 10 nur durch den verwendeten Ausstoßer 62 und das verwendete Halteelement 64. Bei der Drückvorrichtung 60 steht von der Stirnseite des Ausstoßers 62 ein Zentrierzapfen 66 axial ab, der konzentrisch zur Rotationsachse R des Werkzeuges 18 angeordnet ist. Das Halteelement 64 weist eine gleichfalls konzentrisch zur Rotationsachse R ausgebildete Zentrieröffnung 68 auf, mit der der Zentrierzapfen 66 in Eingriff bringbar ist, wie Figur 2 zeigt.2 and 3 show a second embodiment a pushing device 60, which is essentially constructed the structure of the pressing device 10 of the first embodiment like. The pushing device 60 differentiates only compared to the pressing device 10 the ejector 62 used and the holding element used 64. In the pressing device 60 is from the front the ejector 62 axially from a centering pin 66, the arranged concentrically to the axis of rotation R of the tool 18 is. The holding element 64 also has a concentric centering opening formed to the axis of rotation R. 68 with which the centering pin 66 engages can be brought, as Figure 2 shows.

Zum Ausformen des Getriebeteiles 12 wird die Ronde 16 mit ihrer Aufnahmeöffnung 48 zunächst auf den Zentrierzapfen 66 aufgesetzt. Anschließend wird das Halteelement 64 gegen das Werkzeug 18 bewegt, wobei die Zentrieröffnung 68 mit dem Zentrierzapfen 66 in Eingriff kommt. Das Halteelement 64 wird axial so stark gegen das Werkzeug 18 vorgespannt, dass die Ronde 16 drehfest.mit dem Werkzeug 18 und dem Halteelment 64 verbunden ist. Anschließend wird das Werkzeug 18 und das Halteelement 64 in Rotation versetzt und, wie beim ersten Ausführungsbeispiel, mit Hilfe der Drückrolle 40 die Ronde 16 zunächst radial erweitert. Durch das radiale Erweitern der Ronde 18 wird diese in die Nut 22 eingeformt, so dass sich eine kraftschlüssige Verbindung zwischen der Ronde 16 und dem Werkzeug 18 ausbildet. Anschließend wird das Halteelement 64 vom Werkzeug 18 wegbewegt und die Ronde 16 mit Hilfe der Drückrolle 40 umgeformt, wie Fig. 3 zeigt. Dabei dient der Zentrierzapfen 66 als Werkzeugdorn für die auszuformende Nabe 14. Durch eine entsprechende Gestaltung des Zentrierzapfens 66 kann auf diese Weise auch eine Nabe 14 ausgeformt werden, die eine Durchgangsbohrung mit konstantem Durchmesser aufweist. To form the gear part 12, the blank 16 is also its receiving opening 48 initially on the centering pin 66 placed. Then the holding element 64 is against the tool 18 moves, the centering opening 68 with the centering pin 66 comes into engagement. The holding element 64 is biased axially against the tool 18 so strongly that the blank 16 rotatably. with the tool 18 and the holding element 64 is connected. Then the tool 18 and the holding element 64 in rotation and how in the first embodiment, using the spinning roller 40 the blank 16 is initially expanded radially. Through the radial Widening the circular blank 18 is molded into the groove 22, so that there is a positive connection between the blank 16 and the tool 18 forms. Subsequently the holding element 64 is moved away from the tool 18 and shaped the round blank 16 with the aid of the pressure roller 40, 3 shows. The centering pin 66 is used here as a tool mandrel for the hub 14 to be formed appropriate design of the centering pin 66 can this way, a hub 14 can be formed, the one Has through hole with a constant diameter.

Die zuvor beschriebenen Ausführungsbeispiele zeigen nur verschiedene Möglichkeiten, wie eine Drückvorrichtung in erfindungsgemäßer Weise ausgestaltet sein kann. Darüber hinaus liegt es auch im Rahmen der Erfindung, die zuvor beschriebenen Drückvorrichtungen zusätzlich mit Magnetspanneinrichtung oder Vakuumspanneinrichtungen auszustatten.The exemplary embodiments described above show only different options, such as a pushing device can be designed in accordance with the invention. About that it is also within the scope of the invention that previously described pushing devices additionally with magnetic clamping device or vacuum clamping devices.

Claims (10)

  1. Method for the manufacture of a gear part (12) with a boss (14) from a round blank (16), which is placed and clamped on a tool (18) of a spindle, drivable in rotary manner, of a spinning lathe (10; 60), by means of at least one spinning roller (40) a thickness of the round blank (16) is reduced and the material obtained is shaped into the boss (14), characterized in that the clamping of the round blank (16) is brought about by axially pressing a marginal area of said blank (16) against the tool (18) accompanied by a simultaneous radial expansion of the blank (16) and that on radially expanding the round blank (16) it is shaped against an annular, circumferentially directed wall (24) on the tool (18), the round blank (16) being secured in positive and/or frictional engagement on the tool.
  2. Method according to claim 1, characterized in that the circumferentially directed wall passes completely round and is formed by an annular shoulder, which projects axially with respect to the end face of the tool, against which the round blank is pressed during radial expansion.
  3. Method according to claim 1 or 2, characterized in that a circumferential groove (22), whose annular groove wall (22) at least partly forms the circumferentially directed wall, is constructed on the end face (20) of the tool (18), against which the round blank (16) is pressed during radial expansion.
  4. Method according to claim 1, 2 or 3, characterized in that the reduction of the thickness of the round blank (16) is brought about by the radial infeeding of the spinning roller (14), which simultaneously presses the round blank (16) with a clearly defined axial force in axial manner against -the tool (18).
  5. Method according to one of the claims 1 to 4, characterized in that until the positive and/or frictional engagement is produced, the round blank (16) is secured on the tool by means of a separate retaining device, particularly a magnetic clamping device or a vacuum clamping device.
  6. Spinning device, particularly for performing the method according to one of the claims 1 to 5, having a spindle drivable in rotary manner, at least one infeedable spinning roller (40) and a tool (18) fitted to the spindle for securing a round blank (16), characterized in that on the tool (18) is formed an annular, circumferentially directed wall (24) on which the round blank (16) can be secured in positive and/or frictional engagement by radial expansion and that an ejector is provided on the tool.
  7. Spinning device according to claim 6, characterized in that the circumferentially directed wall is formed by an annular shoulder, which projects axially with respect to the end face of the tool, on which the round blank at least partly engages during securing.
  8. Spinning device according to claim 6 or 7, characterized in that a circumferential groove (22), whose one groove wall (24) at least partly forms the circumferentially directed wall, is formed on the end face (20) of the tool (18), on which the round blank (16) at least partly engages during securing.
  9. Spinning device according to claim 6, 7 or 8, characterized in that a profiling for bringing about a positive engagement is formed on a circumferential side of the annular wall directed towards the round blank.
  10. Spinning device according to one of the claims 6 to 8, characterized in that a retaining device constructed as a magnetic clamping device or a vacuum clamping device is provided on the tool for the at least partial clamping of the round blank.
EP01102425A 2000-06-13 2001-02-02 Method and apparatus for manufacturing a gearing element Expired - Lifetime EP1163961B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10029005 2000-06-13
DE10029005A DE10029005A1 (en) 2000-06-13 2000-06-13 Fabrication process to form transmission part with hub from round blank, clamped in tool by pressing edge section against tool and simultaneous expansion by ring-shaped tool part

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EP1163961A1 EP1163961A1 (en) 2001-12-19
EP1163961B1 true EP1163961B1 (en) 2002-06-05
EP1163961B2 EP1163961B2 (en) 2010-03-03

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DE102006022726A1 (en) † 2006-04-21 2007-11-08 Wf-Maschinenbau Und Blechformtechnik Gmbh & Co Kg Manufacturing rim for pneumatic tire, employs circular blank which is pressed by roller to reduce wall thickness of outer flange, before completing remaining rim profiles

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Publication number Priority date Publication date Assignee Title
DE4444526C1 (en) * 1994-11-30 1995-11-30 Wf Maschinenbau Blechformtech Device for non=cutting manufacturing of gearing boss from metal plate
DE19524089C1 (en) † 1995-07-01 1996-09-05 Wf Maschinenbau Blechformtech Method of mfg. gear part of thin metal disc
US5951422A (en) * 1996-06-24 1999-09-14 The Gates Corporation Hub and pulley with radially inward annular collar
DE19849981C5 (en) * 1998-10-29 2006-04-20 Leifeld Metal Spinning Gmbh Method for forming a disc-shaped part with hub and spinning roller for the process

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ATE218403T1 (en) 2002-06-15
EP1163961B2 (en) 2010-03-03
DE10029005A1 (en) 2001-01-18
EP1163961A1 (en) 2001-12-19
DE50100005D1 (en) 2002-07-11

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