EP0546317B1 - Method for manufacturing a moulded flat commutator - Google Patents

Method for manufacturing a moulded flat commutator Download PDF

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Publication number
EP0546317B1
EP0546317B1 EP92118864A EP92118864A EP0546317B1 EP 0546317 B1 EP0546317 B1 EP 0546317B1 EP 92118864 A EP92118864 A EP 92118864A EP 92118864 A EP92118864 A EP 92118864A EP 0546317 B1 EP0546317 B1 EP 0546317B1
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EP
European Patent Office
Prior art keywords
blank
grooves
periphery
planar part
segments
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
EP92118864A
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German (de)
French (fr)
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EP0546317A2 (en
EP0546317A3 (en
Inventor
Joze Potocnik
Boris Kogej
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Kolektor doo
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Kolektor doo
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Publication of EP0546317A2 publication Critical patent/EP0546317A2/en
Publication of EP0546317A3 publication Critical patent/EP0546317A3/en
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Publication of EP0546317B1 publication Critical patent/EP0546317B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/06—Manufacture of commutators
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49011—Commutator or slip ring assembly
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49105—Switch making
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/49218—Contact or terminal manufacturing by assembling plural parts with deforming
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/4922—Contact or terminal manufacturing by assembling plural parts with molding of insulation
    • 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
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/49222—Contact or terminal manufacturing by assembling plural parts forming array of contacts or terminals

Definitions

  • the invention relates to a method for producing a pressed material commutator, which has the features of the preamble of claim 1.
  • a known method of this type (US-A-3 812 576) is disadvantageous primarily because of its relatively large number of individual operations which require transitions between several machines. In addition, this method can impair the secure bond between the segments and the molding compound.
  • the invention is therefore based on the object of specifying a method of the type mentioned at the outset which enables more economical production without impairing the quality of the commutator.
  • a process solves this task the features of claim 1.
  • the blank is preferably produced by extrusion, since then with this reshaping the flat part can be provided on its inside with radial grooves which are aligned with the grooves and merge into them. These radial grooves, along which the separating cuts are made to divide the segments in the flat part, reduce the required depth of these separating cuts, which not only reduces the effort for separating, but also makes a significant contribution to not endangering the secure anchoring of the segments in the pressed material.
  • the shaping by extrusion also enables the simultaneous molding of a ring of inner anchoring elements according to claim 3 without additional effort.
  • the inner anchoring elements are expediently separated from one another by the grooves extending to the edge of the central bore.
  • the grooves and preferably also the grooves are advantageously given a shape that widens in a wedge shape towards the free edge of the jacket. For one, there is such a form inexpensive for forming reasons. On the other hand, it is not difficult with such a shape of the grooves to seal them when the molding compound is subsequently introduced.
  • a circular blank is used as the starting material. This can be punched out of sheet metal or tape. However, the material consumption is lower if the round blank is formed from a disc cut from a bar material.
  • the inner anchoring elements are advantageously bent radially outward to increase their effectiveness. This bending process can be carried out in one operation by splitting off external anchoring elements from the inside of the jacket.
  • an annular disk is cut from a rod material. If the rod material is a thick-walled tube, the disc forms a round blank 1. If, however, the disc is cut from a solid material, a central hole 2 is then punched out to form the round blank 1.
  • the round blank 1 has a thickness of 4 mm with an outside diameter of slightly more than 20 mm.
  • the pot-shaped blank 3 shown in FIGS. 2 and 3 is formed by extrusion, which has an annular shape Plan part 4 and an adjoining tubular jacket 5 forms.
  • grooves 6 are formed on the inside of the jacket 5 in the axial direction and open towards the center, the number of which corresponds to the number of segments 7 of the commutator.
  • the grooves 6 are therefore evenly distributed over the circumference of the jacket 5.
  • the width of the grooves decreases evenly from the free end face of the jacket 5 towards the flat part 4.
  • the angle enclosed by the groove flanks is approximately 15 ° in the exemplary embodiment.
  • the grooves 6 are closed radially outwards by a material section 8 each.
  • the plan part 4 is also provided on its inside with radially extending grooves 9, one of which is aligned with each groove 6 and, as shown in particular in FIG.
  • the width of the grooves 9 therefore corresponds to the width of the grooves 6 at their end on the face part side. Since the segments 7 are separated from one another by separating cuts running along the grooves 9, the required depth of cut is considerably reduced by the grooves 9, to less than 2 mm in the exemplary embodiment. Since the groove 9 extends as far as the edge of the central hole 2, the groove 9 divides a collar formed on the inside of the plan part during the forming process and bordering the central hole 2 into a number of identically designed anchoring elements 10 corresponding to the number of segments 7.
  • a radially outwardly projecting ring flange 11 is molded onto the free end of the jacket 5 of the blank 3.
  • the material parts 8 are removed, as a result of which the segments 7 are separated from one another in the region of the jacket.
  • the sleeve displaces a material layer, the thickness of which is equal to or only slightly larger than the thickness of the material parts 8, in the axial direction towards the free end of the jacket 5, where in a tool receiving the blank 3 there is an annular space corresponding to the annular flange 11 to be formed, into which the displaced material flows.
  • the radial thickness of the material parts 8 is therefore chosen so that the volume of the displaced material layer is sufficient to form the ring flange 11.
  • the ring flange 11 can then be calibrated if necessary. This calibration can be carried out by means of the same press with which the extrusion of the round blank 1 and the formation of the ring flange 11 and the segmentation of the jacket 5 are carried out.
  • the connecting elements to be formed from the annular flange 11 and arranged centrally with respect to the segments 7 are now punched out.
  • outer anchoring elements 13 are also split off on the inside of the jacket 5 from the flange side.
  • the inner anchoring elements 10 are bent radially outwards to improve their anchoring effect.
  • the blank is filled with molding material 15, leaving a central hub bore 14 free.
  • the shape that receives the blank 3 is provided with ribs that penetrate slightly from the outside into the grooves 6 and close them tightly.
  • the required contact pressure of the flanks of the ribs against the flanks of the grooves 6 can be achieved thanks to the wedge-like tapering of the grooves 6 easily reach against the plan part 4.
  • the depth of penetration of the ribs is shown in Fig. 12.
  • the plan part 4 is segmented at the end by cuts running along the grooves 9, from the brush tread 4 '.
  • the slots formed by these cuts which, as shown in FIG. 10, also penetrate somewhat into the molding material 15, are denoted by 16.
  • the connection elements 12 are bent towards the brush tread 4 '.
  • the hub bore 14 is also unscrewed and the sprue of the hub body formed by the molding material 15 is removed by lowering.
  • the brush tread 4 ' can be turned.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Manufacture Of Motors, Generators (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Preßstoff-Plankommutators, das die Merkmale des Oberbegriffs des Anspruches 1 aufweist.The invention relates to a method for producing a pressed material commutator, which has the features of the preamble of claim 1.

Ein bekanntes Verfahren dieser Art (US-A- 3 812 576) ist vor allem wegen seiner relativ großen Anzahl einzelner Arbeitsgänge nachteilig, die Übergänge zwischen mehreren Maschinen erforderlich machen. Außerdem kann es bei diesem Verfahren zu einer Beeinträchtigung des sicheren Verbundes zwischen den Segmenten und der Preßmasse kommen.A known method of this type (US-A-3 812 576) is disadvantageous primarily because of its relatively large number of individual operations which require transitions between several machines. In addition, this method can impair the secure bond between the segments and the molding compound.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art anzugeben, das ohne eine Beeinträchtigung der Qualität des Kommutators eine wirtschaftlichere Fertigung ermöglicht. Diese Aufgabe löst ein Verfahren mit den Merkmalen des Anspruches 1.The invention is therefore based on the object of specifying a method of the type mentioned at the outset which enables more economical production without impairing the quality of the commutator. A process solves this task the features of claim 1.

Die Trennung der Segmente im Bereich des Mantels des Rohlinges bei der Anformung des Ringflansches vereinfacht das Herstellungsverfahren wesentlich, da zum einen ein separater Arbeitsgang zum Trennen der Segmente im Bereich des Mantels entfällt und zum anderen diese Trennung vorgenommen werden kann, ehe in den Rohling der Preßstoff eingebracht wird. Das Trennen der Segmente im Bereich des Mantels kann deshalb sich nicht negativ auf die sichere Verbindung der Segmente mit der Preßmasse auswirken.The separation of the segments in the area of the blank in the shaping of the ring flange simplifies the manufacturing process considerably, since on the one hand there is no separate operation for separating the segments in the area of the jacket and on the other hand this separation can be carried out before the pressed material is in the blank is introduced. The separation of the segments in the area of the jacket can therefore not have a negative effect on the secure connection of the segments with the molding compound.

Vorzugsweise wird der Rohling durch Fließpressen hergestellt, da dann problemlos bei dieser Umformung der Planteil auf seiner Innenseite mit radialen Rillen versehen werden kann, die auf die Nuten ausgerichtet sind und in diese übergehen. Diese radialen Rillen, längs deren die Trennschnitte zur Teilung der Segmente im Planteil geführt werden, reduzieren die erforderliche Tiefe dieser Trennschnitte, was nicht nur den Aufwand für das Trennen reduziert, sondern wesentlich dazu beiträgt, die sichere Verankerung der Segmente im Preßstoff nicht zu gefährden.The blank is preferably produced by extrusion, since then with this reshaping the flat part can be provided on its inside with radial grooves which are aligned with the grooves and merge into them. These radial grooves, along which the separating cuts are made to divide the segments in the flat part, reduce the required depth of these separating cuts, which not only reduces the effort for separating, but also makes a significant contribution to not endangering the secure anchoring of the segments in the pressed material.

Das Umformen durch Fließpressen ermöglicht ferner die gleichzeitige Anformung eines Kranzes von inneren Verankerungselementen gemäß Anspruch 3 ohne zusätzlichen Aufwand. Dabei werden zweckmäßigerweise die inneren Verankerungselemente durch die bis zum Rand der zentralen Bohrung verlaufenden Rillen voneinander getrennt.The shaping by extrusion also enables the simultaneous molding of a ring of inner anchoring elements according to claim 3 without additional effort. The inner anchoring elements are expediently separated from one another by the grooves extending to the edge of the central bore.

Den Nuten und vorzugsweise auch den Rillen gibt man vorteilhafterweise eine sich gegen den freien Rand des Mantels hin keilförmig erweiternde Form. Zum einen ist eine solche Form aus umformungstechnischen Gründen günstig. Zum anderen ist es bei einer solchen Form der Nuten nicht schwierig, diese beim späteren Einbringen der Preßmasse abzudichten.The grooves and preferably also the grooves are advantageously given a shape that widens in a wedge shape towards the free edge of the jacket. For one, there is such a form inexpensive for forming reasons. On the other hand, it is not difficult with such a shape of the grooves to seal them when the molding compound is subsequently introduced.

Bei einer bevorzugten Ausführungsform wird als Ausgangsmaterial eine Ronde verwendet. Diese kann aus einem Blech oder Band ausgestanzt werden. Einen geringeren Materialverbrauch hat man allerdings dann, wenn man die Ronde aus einer von einem Stangenmaterial abgeschnittenen Scheibe bildet.In a preferred embodiment, a circular blank is used as the starting material. This can be punched out of sheet metal or tape. However, the material consumption is lower if the round blank is formed from a disc cut from a bar material.

Vorteilhafterweise werden die inneren Verankerungselemente zur Erhöhung ihrer Wirksamkeit radial nach außen umgebogen. Dieser Biegevorgang kann in einem Arbeitsgang mit dem Abspalten von äußeren Verankerungelementen von der Innenseite des Mantels erfolgen.The inner anchoring elements are advantageously bent radially outward to increase their effectiveness. This bending process can be carried out in one operation by splitting off external anchoring elements from the inside of the jacket.

Im folgenden ist die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels im einzelnen erläutert. Es zeigen:

Fig. 1
einen Querschnitt einer Ronde,
Fig. 2
einen Querschnitt des aus der Ronde hergestellten Formlings,
Fig. 3
einen Schnitt nach der Linie III-III der Fig. 2,
Fig. 4
eine Draufsicht auf die Rückseite des Rohling nach dem Anformen des Ringflansches,
Fig. 5
einen Schnitt nach der Linie V-V der Fig. 4,
Fig. 6
eine Draufsicht auf die Rückseite des Rohlings nach dem Freistanzen der Anschlußelemente und dem Formen der Verankerungselemente,
Fig. 7
einen Schnitt nach der Linie VII-VII der Fig. 6,
Fig. 8
einen unvollständig und vergrößert dargestellten Schnitt durch den Planteil mit einer Draufsicht auf die Innenfläche des Mantels nach der Anformung des Flanschringes,
Fig. 9
einen Schnitt und eine Ansicht entsprechend Fig. 8 nach dem Freistanzen der Anschlußelemente,
Fig. 10
eine perspektivisch dargestellte Ansicht des Ausführungsbeispiels im fertigen Zustand,
Fig. 11
einen Schnitt nach der Linie XI-XI der Fig. 10 des Ausführungsbeispiels vor dem Biegen der Anschlußelemente,
Fig. 12
einen unvollständig dargestellten Schnitt nach der Linie XII-XII der Fig. 11.
The invention is explained in detail below using an exemplary embodiment shown in the drawing. Show it:
Fig. 1
a cross section of a round blank,
Fig. 2
a cross section of the blank produced from the blank,
Fig. 3
2 shows a section along the line III-III of FIG. 2,
Fig. 4
a plan view of the back of the blank after the ring flange has been formed,
Fig. 5
4 shows a section along the line VV of FIG. 4,
Fig. 6
a plan view of the back of the blank after punching out the connecting elements and shaping the anchoring elements,
Fig. 7
6 shows a section along line VII-VII of FIG. 6,
Fig. 8
an incomplete and enlarged section through the plan part with a plan view of the inner surface of the shell after the flange ring has been formed,
Fig. 9
8 shows a section and a view corresponding to FIG. 8 after the connection elements have been punched free,
Fig. 10
3 shows a perspective view of the exemplary embodiment in the finished state,
Fig. 11
10 shows a section along the line XI-XI of FIG. 10 of the exemplary embodiment before the connection elements are bent,
Fig. 12
an incomplete section along the line XII-XII of FIG. 11th

Zur Herstellung des in der Zeichnung dargestellten Ausführungsbeispiels eines erfindungsgemäßen Preßstoff-Plankommutators wird von einem Stangenmaterial eine Ringscheibe abgeschnitten. Handelt es sich bei dem Stangenmaterial um ein dickwandiges Rohr, dann bildet die Scheibe eine Ronde 1. Wird hingegen die Scheibe von einem Vollmaterial abgeschnitten, dann wird anschließend zur Bildung der Ronde 1 ein zentrales Loch 2 ausgestanzt. Im Ausführungsbeispiel hat die Ronde 1 bei einem Außendurchmesser von etwas mehr als 20 mm eine Dicke von 4 mm. Anschließend wird durch Fließpressen der in den Fig. 2 und 3 dargestellte topfförmige Rohling 3 gebildet, der einen kreisringförmigen Planteil 4 und einen sich daran anschließenden, rohrförmigen Mantel 5 bildet. Bei der Umformung der Ronde 1 werden an der Innenseite des Mantels 5 in diesen in axialer Richtung verlaufende und zum Zentrum hin offene Nuten 6 eingeformt, deren Anzahl der Zahl der Segmente 7 des Kommutators entspricht. Die Nuten 6 sind deshalb gleichmäßig über den Umfang des Mantels 5 verteilt. Wie insbesondere die Fig. 8 und 9 zeigen, nimmt die Breite der Nuten von der freien Stirnseite des Mantels 5 aus gegen den Planteil 4 hin gleichmäßig ab. Der von den Nutflanken eingeschlossene Winkel beträgt im Ausführungsbeispiel etwa 15°. Radial nach außen sind die Nuten 6 nach ihrer Bildung durch je eine Materialpartie 8 geschlossen. Bei der Umformung der Ronde 1 wird außerdem der Planteil 4 auf seiner Innenseite mit radial verlaufenden Rillen 9 versehen, von denen je eine auf jede Nut 6 ausgerichtet ist und, wie insbesondere Fig. 3 zeigt, in diese übergeht. Die Breite der Rillen 9 entspricht deshalb der Breite der Nuten 6 an deren planteilseitigem Ende. Da die Segmente 7 durch längs der Rillen 9 verlaufende Trennschnitte voneinander getrennt werden, wird durch die Rillen 9 die erforderliche Schnittiefe erheblich reduziert, im Ausführungsbeispiel auf weniger als 2 mm. Da sich die Rille 9 bis zum Rand des zentralen Loches 2 erstrecken, wird durch die Rille 9 ein beim Umformen innen an den Planteil angeformter, das zentrale Loch 2 berandender Bund in eine der Zahl der Segmente 7 entsprechende Anzahl von gleich ausgebildeten Verankerungselementen 10 unterteilt.To produce the exemplary embodiment of a pressed material commutator according to the invention shown in the drawing, an annular disk is cut from a rod material. If the rod material is a thick-walled tube, the disc forms a round blank 1. If, however, the disc is cut from a solid material, a central hole 2 is then punched out to form the round blank 1. In the exemplary embodiment, the round blank 1 has a thickness of 4 mm with an outside diameter of slightly more than 20 mm. Subsequently, the pot-shaped blank 3 shown in FIGS. 2 and 3 is formed by extrusion, which has an annular shape Plan part 4 and an adjoining tubular jacket 5 forms. When the round blank 1 is formed, grooves 6 are formed on the inside of the jacket 5 in the axial direction and open towards the center, the number of which corresponds to the number of segments 7 of the commutator. The grooves 6 are therefore evenly distributed over the circumference of the jacket 5. As shown in FIGS. 8 and 9 in particular, the width of the grooves decreases evenly from the free end face of the jacket 5 towards the flat part 4. The angle enclosed by the groove flanks is approximately 15 ° in the exemplary embodiment. After their formation, the grooves 6 are closed radially outwards by a material section 8 each. When the blank 1 is formed, the plan part 4 is also provided on its inside with radially extending grooves 9, one of which is aligned with each groove 6 and, as shown in particular in FIG. 3, merges into it. The width of the grooves 9 therefore corresponds to the width of the grooves 6 at their end on the face part side. Since the segments 7 are separated from one another by separating cuts running along the grooves 9, the required depth of cut is considerably reduced by the grooves 9, to less than 2 mm in the exemplary embodiment. Since the groove 9 extends as far as the edge of the central hole 2, the groove 9 divides a collar formed on the inside of the plan part during the forming process and bordering the central hole 2 into a number of identically designed anchoring elements 10 corresponding to the number of segments 7.

Im nächsten Arbeitsgang wird an das freie Ende des Mantels 5 des Rohlinges 3 ein radial nach außen abstehender Ringflansch 11 angeformt. Gleichzeitig werden die Materialpartien 8 entfernt, wodurch die Segmente 7 im Bereich des Mantels voneinander getrennt werden. Mittels eines Werkzeuges in Form einer zylindrischen Buchse wird, an der äußeren Stirnfläche des Planteiles 4 beginnend, eine Materialschicht, deren Dicke gleich der Dicke der Materialpartien 8 oder nur unwesentlich größer ist, in axialer Richtung gegen das freie Ende des Mantels 5 hin verdrängt, wo in einem den Rohling 3 aufnehmenden Werkzeug ein dem zu bildenden Ringflansch 11 entsprechender Ringraum vorhanden ist, in den hinein das verdrängte Material fließt. Die radiale Dicke der Materialpartien 8 ist deshalb so gewählt, daß das Volumen der verdrängten Materialschicht zur Bildung des Ringflansches 11 ausreicht.In the next step, a radially outwardly projecting ring flange 11 is molded onto the free end of the jacket 5 of the blank 3. At the same time, the material parts 8 are removed, as a result of which the segments 7 are separated from one another in the region of the jacket. Using a tool in the form of a cylindrical Starting from the outer end face of the plan part 4, the sleeve displaces a material layer, the thickness of which is equal to or only slightly larger than the thickness of the material parts 8, in the axial direction towards the free end of the jacket 5, where in a tool receiving the blank 3 there is an annular space corresponding to the annular flange 11 to be formed, into which the displaced material flows. The radial thickness of the material parts 8 is therefore chosen so that the volume of the displaced material layer is sufficient to form the ring flange 11.

Anschließend kann der Ringflansch 11, falls erforderlich, kalibriert werden. Diese Kalibrierung kann mittels derselben Presse erfolgen, mit der das Fließpressen der Ronde 1 und das Bilden des Ringflansches 11 sowie das Segmentieren des Mantels 5 durchgeführt wird.The ring flange 11 can then be calibrated if necessary. This calibration can be carried out by means of the same press with which the extrusion of the round blank 1 and the formation of the ring flange 11 and the segmentation of the jacket 5 are carried out.

In einem weiteren Arbeitsgang, der mittels einer Presse durchgeführt werden kann, deren Preßkraft wesentlich kleiner ist als diejenige, die beim Fließpressen benutzt wird, werden nun die aus dem Ringflansch 11 zu bildenden, mittig bezüglich der Segmente 7 angeordneten Anschlußelemente freigestanzt. Bei diesem Stanzvorgang werden außerdem an der Innenseite des Mantels 5 von der Flanschseite her äußere Verankerungselemente 13 abgespalten. Ferner werden die inneren Verankerungselemente 10 zur Verbesserung ihrer Verankerungswirkung radial nach außen gebogen. In dem folgenden Verfahrensschritt wird der Rohling unter Freilassung einer zentralen Nabenbohrung 14 mit Preßstoff 15 gefüllt. Die Form, die dabei den Rohling 3 aufnimmt, ist mit Rippen versehen, die geringfügig von außen her in die Nuten 6 eindringen und diese dicht verschließen. Der hierfür erforderliche Anpreßdruck der Flanken der Rippen an die Flanken der Nuten 6 läßt sich dank der keilartigen Verjüngung der Nuten 6 gegen den Planteil 4 hin problemlos erreichen. Die Eindringtiefe der Rippen ist in Fig. 12 dargestellt. Nach dem Aushärten des Preßstoffes 15 wird zum Schluß der Planteil 4 durch längs der Rillen 9 verlaufende, von der Bürstenlauffläche 4′ her eindringende Schnitte segmentiert. Die durch diese Schnitte gebildeten Schlitze, die, wie Fig. 10 zeigt, auch noch etwas in den Preßstoff 15 eindringen, sind mit 16 bezeichnet. Außerdem werden noch die Anschlußelemente 12 zur Bürstenlauffläche 4′ hin abgebogen. Sofern erforderlich, wird ferner die Nabenbohrung 14 ausgedreht und der Anguß des vom Preßstoff 15 gebildeten Nabenkörpers durch Senken entfernt. Schließlich kann natürlich, falls erforderlich, die Bürstenlauffläche 4′ überdreht werden.In a further operation, which can be carried out by means of a press, the pressing force of which is considerably smaller than that which is used in the extrusion, the connecting elements to be formed from the annular flange 11 and arranged centrally with respect to the segments 7 are now punched out. In this punching process, outer anchoring elements 13 are also split off on the inside of the jacket 5 from the flange side. Furthermore, the inner anchoring elements 10 are bent radially outwards to improve their anchoring effect. In the following process step, the blank is filled with molding material 15, leaving a central hub bore 14 free. The shape that receives the blank 3 is provided with ribs that penetrate slightly from the outside into the grooves 6 and close them tightly. The required contact pressure of the flanks of the ribs against the flanks of the grooves 6 can be achieved thanks to the wedge-like tapering of the grooves 6 easily reach against the plan part 4. The depth of penetration of the ribs is shown in Fig. 12. After the molding material 15 has hardened, the plan part 4 is segmented at the end by cuts running along the grooves 9, from the brush tread 4 '. The slots formed by these cuts, which, as shown in FIG. 10, also penetrate somewhat into the molding material 15, are denoted by 16. In addition, the connection elements 12 are bent towards the brush tread 4 '. If necessary, the hub bore 14 is also unscrewed and the sprue of the hub body formed by the molding material 15 is removed by lowering. Finally, of course, if necessary, the brush tread 4 'can be turned.

Claims (8)

  1. A method for producing a pressed material planar commutator having connecting members at the free ends of the parts of the segments lying in a cylinder surface, wherein
    a) a cup-shaped blank (3) is formed by reshaping from a planar material, which said blank has an external annular flange (11) and a number, corresponding to the number of segments (7), of axially extending, radially inwardly open grooves (6) disposed uniformly over the periphery in the cylindrical part of the blank (3),
    b) the inner chamber of the blank (3) is filled with pressed material while leaving free a central bore,
    c) the annular flange (11) is removed except from the parts which are required for the connecting members and
    d) the blank (3) is divided into segments (7) by working in radially extending slots in the planar part and removing the material which is closing radially outwardly the grooves (6),
    characterised in that at the outer side of the cylindrical periphery (5) of the blank (3) a layer, which has a thickness corresponding at least to the radial thickness of the material portions (8) which radially outwardly close the grooves (6), is removed starting from the outer side of the planar part (4) corresponding to the subsequent brush running surface (4′) towards the free end of the periphery (5) whilst forming the annular flange (11) and opening the grooves (6).
  2. A method according to claim 1, characterised in that the blank (3) is produced by extrusion and that when forming the planar part (4) radial channels (9) are provided on the inner side thereof, which radial channels are directed towards the grooves (6) and change into said grooves (6).
  3. A method according to claim 2, characterised in that during the forming process effected by extrusion a ring of inner anchoring members (10) is formed in the ring region bordering the central hole (2), which anchoring members (10) protrude in an axial direction from the inner side of the planar part (4) and are separated from each other by the channels (9) formed in the planar part (4).
  4. A method according to claim 2 or 3, characterised in the grooves (6) and preferably also the channels (9) are formed in the shape of a wedge which widens from the planar part (4) towards the free edge of the periphery (5).
  5. A method according to claims 1 to 4, characterised in that a round blank (1) is used as the starting material.
  6. A method according to claim 5, characterised in that the round blank (1) is formed from a disc cut from a rod material.
  7. A method according to any one of claims 1 to 6, characterised in that the inner anchoring members (10) are curved radially outwardly and during this procedure step outer anchoring members (13) are divided off from the inner side of the periphery (5).
  8. A method according to any one of claims 1 to 7, characterised in that in the cast form, into which the blank (3) is formed for filling with the pressed material (15), the pressed material (15) is prevented from escaping from the grooves (6) by means of sealing ribs, which engage the grooves (6) and lie immediately adjacent the edges thereof.
EP92118864A 1991-12-09 1992-11-04 Method for manufacturing a moulded flat commutator Expired - Lifetime EP0546317B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4140475 1991-12-09
DE4140475A DE4140475C2 (en) 1991-12-09 1991-12-09 Process for the production of a press commutator

Publications (3)

Publication Number Publication Date
EP0546317A2 EP0546317A2 (en) 1993-06-16
EP0546317A3 EP0546317A3 (en) 1993-12-08
EP0546317B1 true EP0546317B1 (en) 1995-02-15

Family

ID=6446576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118864A Expired - Lifetime EP0546317B1 (en) 1991-12-09 1992-11-04 Method for manufacturing a moulded flat commutator

Country Status (3)

Country Link
US (1) US5353492A (en)
EP (1) EP0546317B1 (en)
DE (2) DE4140475C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2447556C2 (en) * 2006-09-29 2012-04-10 Роберт Бош Гмбх End-plate commutator

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Publication number Priority date Publication date Assignee Title
US5602438A (en) * 1991-02-28 1997-02-11 Robert Bosch Gmbh Roll commutator for electric motors and dynamos, and method of manufacturing it
US5970607A (en) * 1993-09-30 1999-10-26 Illinois Tool Works Inc. Method of making an electrical subassembly
JP2823037B2 (en) * 1993-11-11 1998-11-11 矢崎総業株式会社 Wire holding case
GB2286487A (en) * 1994-02-12 1995-08-16 Johnson Electric Sa Planar moulded carbon segment commutator
DE19514795C1 (en) * 1995-04-21 1996-06-05 Anton Holzhauer Umformtechnik Method of manufacturing a commutator
KR100278006B1 (en) * 1998-11-11 2001-01-15 윤종용 Microwave oven with commutator, and manufacturing method of commutator for microwave
DE19925286A1 (en) 1999-06-02 2000-12-07 Kolektor D O O Method for producing a flat commutator and a flat commutator produced by this method
US6849170B2 (en) * 2003-01-27 2005-02-01 Institut National D'optique Process for making microdevice with movable microplatform
DE102005028789A1 (en) * 2005-06-16 2006-12-28 Kautt & Bux Gmbh Plan commutator for use in e.g. fuel pump, has carrier body with slots arranged in reference to commutator segments such that separating tool does not come in contact with contact surface of body during segmentation

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GB738823A (en) * 1952-06-24 1955-10-19 Hoover Ltd Improvements relating to commutators
JPS4936721B1 (en) * 1970-01-20 1974-10-03
JPS5227801B2 (en) * 1971-10-25 1977-07-22
JPS585515B2 (en) * 1974-03-13 1983-01-31 株式会社デンソー Kaitenden Kiyoseiriyushino Seizouhouhou
FR2548471B1 (en) * 1983-06-28 1985-10-25 Paris & Du Rhone PERFECTED FRONTAL COLLECTOR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2447556C2 (en) * 2006-09-29 2012-04-10 Роберт Бош Гмбх End-plate commutator

Also Published As

Publication number Publication date
DE4140475C2 (en) 1995-01-19
EP0546317A2 (en) 1993-06-16
DE59201411D1 (en) 1995-03-23
EP0546317A3 (en) 1993-12-08
US5353492A (en) 1994-10-11
DE4140475A1 (en) 1993-06-17

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