EP2542790A1 - Fastening means and associated production method - Google Patents

Fastening means and associated production method

Info

Publication number
EP2542790A1
EP2542790A1 EP11701214A EP11701214A EP2542790A1 EP 2542790 A1 EP2542790 A1 EP 2542790A1 EP 11701214 A EP11701214 A EP 11701214A EP 11701214 A EP11701214 A EP 11701214A EP 2542790 A1 EP2542790 A1 EP 2542790A1
Authority
EP
European Patent Office
Prior art keywords
layer
corrosion
fastening means
resistant layer
resistant
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.)
Withdrawn
Application number
EP11701214A
Other languages
German (de)
French (fr)
Inventor
Harald Kast
Juergen Reiner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2542790A1 publication Critical patent/EP2542790A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/008—Corrosion preventing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
    • F16B2200/79—Friction-reducing coatings
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12625—Free carbon containing component
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12708—Sn-base component
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12903—Cu-base component

Definitions

  • the invention relates to a fastener according to the preamble of independent claim 1 and an associated manufacturing method according to the preamble of independent claim 7.
  • the fastening means according to the invention with the features of independent claim 1 has the advantage that at least one corrosion-resistant layer at least partially a further layer is applied, which has a smaller coefficient of friction than the at least one corrosion-resistant layer.
  • Layer is applied, according to the invention on the corrosion-resistant layer at least partially on another layer, which has a smaller
  • Friction coefficient than the at least one corrosion-resistant layer has.
  • Embodiments of the present invention advantageously provide fasteners having high corrosion resistance, which simultaneously have good lubricating properties and reduced coefficients of friction.
  • the further layer can be applied directly or via at least one intermediate layer to the corrosion-resistant layer.
  • the essence of the present invention is to provide a suitable surface for a fastener which on the one hand positively affects the coefficient of friction and on the other hand has no other negative effects on the screw or press-fit partners used. This is after the
  • the corrosion-resistant layer applied another layer with a smaller coefficient of friction.
  • the further layer which is applied for example as a finishing layer, assumes the lubricating properties and can additionally increase the corrosion resistance, depending on the material selected.
  • the corrosion-resistant layer is designed as a zinc-nickel layer.
  • the corrosion-resistant layer can be produced from an iron-zinc combination and / or from other materials or combinations of materials which are suitable for ensuring adequate corrosion protection.
  • friction-reducing materials for the further layer zinc and / or aluminum and / or tin and / or copper and / or carbon and / or other materials or material combinations can be used, which are suitable to reduce the coefficient of friction.
  • the use of zinc indicates the
  • the technical facilities and methods for applying the zinc layer are widely available and known. Since the further layer is applied only to improve the coefficient of friction, this layer can be applied with a very low layer thickness in the range of approximately 1 to 15 ⁇ m, and thus advantageously does not decisively influence the original shape of the fastening element. In addition, due to the very good connection between the zinc-nickel layer as a corrosion-resistant layer with the additional zinc layer stable and reduced friction coefficients are expected. The known chemical resistance can also be positively evaluated.
  • the base body comprises a thread, in particular a self-tapping thread.
  • the fastening means as a screw or bolt, for example, only on the threaded portion of the screw or on the shaft portion of the bolt, the further layer for friction reduction can be applied.
  • the lower friction reducing layer may be completely applied to the screw or
  • the corrosion-resistant layer by a galvanic process and / or wet-chemical process and / or spraying and / or dipping on the
  • the further layer can be applied to the corrosion-resistant layer directly or via at least one intermediate layer by means of a galvanic method and / or wet-chemical method and / or spraying method and / or immersion method.
  • the further layer embodied as a zinc layer is applied to the corrosion-resistant layer by a hot-dip galvanizing process directly or via at least one intermediate layer.
  • Embodiments of the invention can be used for example for Versch robbery of control units in the motor vehicle.
  • Figure 1 shows a schematic sectional view of a section of an embodiment of a fastening means according to the invention.
  • Metal sheets and metal parts made of, for example, steel and aluminum are often provided with a coating which protects the sheet or part against attack by corrosive media.
  • This coating can also improve the adhesion of coatings applied thereon, further improving the corrosion resistance of the sheet or part.
  • some anticorrosive coatings have Cr (VI) -containing compositions which are no longer desirable because of the toxicity of Cr (VI).
  • the regulation is replacing Cr (VI) -containing coatings, so that the demand for alternative corrosion coatings for metal parts in the automotive sector has risen sharply.
  • Cr (VI) -containing coatings so that the demand for alternative corrosion coatings for metal parts in the automotive sector has risen sharply.
  • suitable coatings In particular, thick-layer passivation, topcoats and sealants are used here, which are mainly used on zinc layers.
  • the mentioned alternative surfaces can adversely affect the screwing situations, such as the setting behavior, for example, or cause problems due to media incompatibility or functionally critical particle formation.
  • the coefficient of friction is almost always increased by one of the aforementioned treatments.
  • This layer has a high friction and as a result the parameters change, e.g. in screwing situations up to exceeding the maximum permissible torque. Especially with self-tapping screws, this limit is quickly exceeded in zinc-nickel coated screws.
  • the illustrated exemplary embodiment of a fastening means 10 comprises a base body 12 made of a base metal on which at least one corrosion-resistant layer 14 is applied, which is embodied, for example, as a zinc-nickel layer and / or iron-zinc layer is.
  • at least one further layer 16 which has a smaller coefficient of friction than the at least one corrosion-resistant layer 14, is at least partially applied to the at least one corrosion-resistant layer 14.
  • the further layer 16 is designed as a finishing layer and applied directly to the corrosion-resistant layer 14.
  • further intermediate layers can be arranged between the corrosion-resistant layer 14 and the further layer 16.
  • a further layer such as a lacquer layer, can be applied over the further layer 16.
  • the further layer 16 can be embodied, for example, as a zinc layer and / or aluminum layer and / or tin layer and / or copper layer and / or carbon layer and has a thickness in the range from approximately 1 to 15 ⁇ m.
  • the base body 12 comprises, for example, a self-tapping thread.
  • the further layer 16 according to the invention has a friction-reducing effect, so that the
  • the friction-reducing sealing layer 16 also positively influences other processes, such as, for example, injection-molding processes.
  • the inventive method for producing a fastening means 10 with a base body 12 made of a parent metal brings at least one corrosion-resistant layer 14 on the base body. Subsequently, according to the invention, at least one further layer 16 is applied to the at least one corrosion-resistant layer 14, which has a smaller coefficient of friction than the at least one corrosion-resistant layer 14.
  • the corrosion-resistant layer 14 can be applied to the base metal 12, for example, by a galvanic method and / or a wet-chemical method and / or a spraying method and / or a dipping method.
  • the further layer 16 can be applied to the corrosion-resistant layer 14 directly or via at least one intermediate layer by means of a galvanic method and / or a wet-chemical method and / or a spraying method and / or a dipping method.
  • the further layer 16 embodied as a zinc layer can be applied to the corrosion-resistant layer 14 directly or via at least one intermediate layer by means of a hot-dip galvanizing process.
  • the essential advantage of the present invention is that fastening means are provided with high corrosion resistance, which at the same time have good lubricating properties or reduced coefficients of friction.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention relates to a fastening means (10) with a basic body (12) made from a base metal, onto which at least one corrosion-resistant layer (14) is applied. According to the invention, a further layer (16) is applied at least partially onto the at least one corrosion-resistant layer (14), which further layer (16) has a lower coefficient of friction than the at least one corrosion-resistant layer (14).

Description

Beschreibung  description
Titel title
Befestigungsmittel und zugehöriges Herstellungsverfahren Stand der Technik  Fasteners and associated manufacturing method prior art
Die Erfindung geht aus von einem Befestigungsmittel nach der Gattung des unabhängigen Patentanspruchs 1 und von einem zugehörigen Herstellungsverfahren nach der Gattung des unabhängigen Patentanspruchs 7. The invention relates to a fastener according to the preamble of independent claim 1 and an associated manufacturing method according to the preamble of independent claim 7.
In der Offenlegungsschrift DE-A-2 322 352 wird ein galvanisch verchromtes Befestigungsmittel aus Kohlenstoffstahl mit einem Schraubengewinde beschrieben. Das beschriebene Befestigungsmittel weist gute Korrosionsfestigkeitseigenschaften und einen Aufbau aus gesonderten Schichten bestehend aus einem strukturellen Grundmetall und mehreren Schichten aus Metall bzw. Metalllegierungen auf, welche durch elektrolytische Beschichtungsverfahren aufgebracht werden und gute Korrosionsfestigkeitseigenschaften und gute Hafteigenschaften ergeben. In the published patent application DE-A-2 322 352 a galvanically chromed fastening means made of carbon steel with a screw thread is described. The fastener described has good corrosion resistance properties and a structure of separate layers consisting of a structural base metal and multiple layers of metal or metal alloys, which are applied by electrolytic coating processes and give good corrosion resistance properties and good adhesion properties.
Offenbarung der Erfindung Disclosure of the invention
Das erfindungsgemäße Befestigungsmittel mit den Merkmalen des unabhängigen Patentanspruchs 1 hat demgegenüber den Vorteil, dass auf mindestens eine korrosionsbeständige Schicht zumindest teilweise eine weitere Schicht aufgebracht ist, welche einen kleineren Reibbeiwert als die mindestens eine korrosionsbeständige Schicht aufweist. The fastening means according to the invention with the features of independent claim 1 has the advantage that at least one corrosion-resistant layer at least partially a further layer is applied, which has a smaller coefficient of friction than the at least one corrosion-resistant layer.
Ein Verfahren zur Herstellung eines Befestigungsmittels mit einem Grundkörper aus einem Grundmetall, auf weichen mindestens eine korrosionsbeständige A method of making a fastener having a base body of a parent metal on soft at least one corrosion resistant
Schicht aufgebracht wird, bringt erfindungsgemäß auf die korrosionsbeständige Schicht zumindest teilweise eine weitere Schicht auf, welche einen kleineren Layer is applied, according to the invention on the corrosion-resistant layer at least partially on another layer, which has a smaller
Reibbeiwert als die mindestens eine korrosionsbeständige Schicht aufweist. Ausführungsformen der vorliegenden Erfindung stellen in vorteilhafter Weise Befestigungsmittel mit hoher Korrosionsbeständigkeit zur Verfügung, die gleichzeitig gute Schmiereigenschaften bzw. reduzierte Reibbeiwerte aufweisen. Die weitere Schicht kann direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht aufgebracht werden. Friction coefficient than the at least one corrosion-resistant layer has. Embodiments of the present invention advantageously provide fasteners having high corrosion resistance, which simultaneously have good lubricating properties and reduced coefficients of friction. The further layer can be applied directly or via at least one intermediate layer to the corrosion-resistant layer.
Der Kern der vorliegenden Erfindung besteht darin, eine geeignete Oberfläche für ein Befestigungsmittel zu schaffen, welche einerseits den Reibbeiwert positiv beeinflusst und andererseits keine anderen negativen Auswirkungen auf die eingesetzten Verschraubungs- oder Einpresspartner hat. Hierbei wird nach dem The essence of the present invention is to provide a suitable surface for a fastener which on the one hand positively affects the coefficient of friction and on the other hand has no other negative effects on the screw or press-fit partners used. This is after the
Auftrag der korrosionsbeständigen Schicht eine weitere Schicht mit einem kleineren Reibbeiwert aufgetragen. Somit übernimmt die weitere Schicht, die beispielsweise als Abschlussschicht aufgebracht wird, die Schmiereigenschaften und kann in Abhängigkeit vom gewählten Material zusätzlich noch die Korrosionsbeständigkeit erhöhen. Order the corrosion-resistant layer applied another layer with a smaller coefficient of friction. Thus, the further layer, which is applied for example as a finishing layer, assumes the lubricating properties and can additionally increase the corrosion resistance, depending on the material selected.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen und Weiterbildungen sind vorteilhafte Verbesserungen des im unabhängigen Patentan- spruch 1 angegebenen Befestigungsmittels und des im unabhängigen Patentanspruch 7 angegebenen Herstellungsverfahrens möglich. Advantageous improvements of the fastening means specified in the independent patent claim 1 and of the manufacturing method specified in the independent claim 7 are possible by the measures and developments listed in the dependent claims.
Besonders vorteilhaft ist, dass die korrosionsbeständige Schicht als Zink-Nickel- Schicht ausgeführt ist. Alternativ kann die korrosionsbeständige Schicht aus einer Ei- sen-Zink-Kombination und/oder aus anderen Materialien bzw. Materialkombinationen hergestellt werden, welche geeignet sind, einen ausreichenden Korrosionsschutz zu gewährleisten. Hierbei können als reibwertreduzierende Materialien für die weitere Schicht Zink und/oder Aluminium und/oder Zinn und/oder Kupfer und/oder Kohlenstoff und/oder andere Materialien bzw. Materialkombinationen verwendet werden, welche geeignet sind, den Reibbeiwert zu reduzieren. Die Verwendung von Zink weist denIt is particularly advantageous that the corrosion-resistant layer is designed as a zinc-nickel layer. Alternatively, the corrosion-resistant layer can be produced from an iron-zinc combination and / or from other materials or combinations of materials which are suitable for ensuring adequate corrosion protection. Here, as friction-reducing materials for the further layer zinc and / or aluminum and / or tin and / or copper and / or carbon and / or other materials or material combinations can be used, which are suitable to reduce the coefficient of friction. The use of zinc indicates the
Vorteil auf, dass die technischen Einrichtungen und Verfahren zum Aufbringen der Zinkschicht weitgehend vorhanden und bekannt sind. Da die weitere Schicht nur zur Verbesserung des Reibwertes aufgebracht wird, kann diese Schicht mit einer sehr geringen Schichtstärke im Bereich von ungefähr 1 bis 15μηΊ aufgebracht werden und be- einflusst somit in vorteilhafter Weise die Urform des Befestigungsmittels nicht maßgeblich. Zudem können durch die sehr gute Verbindung zwischen der Zink-Nickel-Schicht als korrosionsbeständige Schicht mit der weiteren Zinkschicht stabile und reduzierte Reibbeiwerte erwartet werden. Auch die bekannten chemischen Beständigkeiten können positiv bewertet werden. Advantage that the technical facilities and methods for applying the zinc layer are widely available and known. Since the further layer is applied only to improve the coefficient of friction, this layer can be applied with a very low layer thickness in the range of approximately 1 to 15 μm, and thus advantageously does not decisively influence the original shape of the fastening element. In addition, due to the very good connection between the zinc-nickel layer as a corrosion-resistant layer with the additional zinc layer stable and reduced friction coefficients are expected. The known chemical resistance can also be positively evaluated.
In vorteilhafter Ausgestaltung des Befestigungsmittels umfasst der Grundkörper ein Gewinde, insbesondere ein selbstfurchendes Gewinde. Bei der Ausführung des Befestigungsmittels als Schraube bzw. Bolzen, kann beispielsweise nur auf den Gewindebereich der Schraube bzw. auf den Schaftbereich des Bolzens die weitere Schicht zur Reibungsreduzierung aufgebracht werden. Alternativ kann die wertere Schicht zur Reibungsreduzierung vollständig auf die Schraube bzw. In an advantageous embodiment of the fastening means, the base body comprises a thread, in particular a self-tapping thread. In the embodiment of the fastening means as a screw or bolt, for example, only on the threaded portion of the screw or on the shaft portion of the bolt, the further layer for friction reduction can be applied. Alternatively, the lower friction reducing layer may be completely applied to the screw or
den Bolzen aufgebracht werden. the bolt is applied.
In vorteilhafter Ausgestaltung des erfindungsgemäßen Verfahrens wird die korrosionsbeständige Schicht durch ein galvanisches Verfahren und/oder nasschemisches Verfahren und/oder Sprühverfahren und/oder Tauchverfahren auf das In an advantageous embodiment of the method according to the invention, the corrosion-resistant layer by a galvanic process and / or wet-chemical process and / or spraying and / or dipping on the
Grundmetall aufgebracht. Analog kann die weitere Schicht durch ein galvanisches Verfahren und/oder nasschemisches Verfahren und/oder Sprühverfahren und/oder Tauchverfahren direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht aufgebracht werden. Base metal applied. Analogously, the further layer can be applied to the corrosion-resistant layer directly or via at least one intermediate layer by means of a galvanic method and / or wet-chemical method and / or spraying method and / or immersion method.
In weiterer vorteilhafter Ausgestaltung des erfindungsgemäßen Verfahrens wird die als Zinkschicht ausgeführte weitere Schicht durch einen Feuerverzinkungs- vorgang direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht aufgebracht. In a further advantageous embodiment of the method according to the invention, the further layer embodied as a zinc layer is applied to the corrosion-resistant layer by a hot-dip galvanizing process directly or via at least one intermediate layer.
Ausführungsformen der Erfindung können beispielsweise zur Versch raubung von Steuergeräten im Kraftfahrzeug verwendet werden. Embodiments of the invention can be used for example for Versch robbery of control units in the motor vehicle.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. An embodiment of the invention is illustrated in the drawings and will be explained in more detail in the following description.
Kurze Beschreibung der Zeichnung Short description of the drawing
Figur 1 zeigt eine schematische Schnittdarstellung eines Ausschnitts eines Ausführungsbeispiels eines erfindungsgemäßen Befestigungsmittels. Ausführungsformen der Erfindung Figure 1 shows a schematic sectional view of a section of an embodiment of a fastening means according to the invention. Embodiments of the invention
Metallbleche und Metallteile, welche beispielsweise aus Stahl und Aluminium gefertigt sind, sind häufig mit einer Beschichtung versehen, die das Blech oder Teil gegen Angriffe von korrosiven Medien schützt. Durch diese Beschichtung kann ferner die Haftung von darauf aufgebrachten Lackierungen verbessert werden, was die Korrosionsbeständigkeit des Blechs oder Teils weiter verbessert. Manche Korrosionsschutzbeschichtungen weisen jedoch Cr(VI)-haltige Zusammensetzungen auf, welche wegen der Giftigkeit von Cr(VI) nicht mehr gewünscht sind. Im Rahmen der EU-Altauto-Verordnung sowie der Elektroschrott-Metal sheets and metal parts made of, for example, steel and aluminum are often provided with a coating which protects the sheet or part against attack by corrosive media. This coating can also improve the adhesion of coatings applied thereon, further improving the corrosion resistance of the sheet or part. However, some anticorrosive coatings have Cr (VI) -containing compositions which are no longer desirable because of the toxicity of Cr (VI). Within the framework of the EU end-of-life vehicle regulation and the electronic scrap
Verordnung werden Cr(VI)-haltige Beschichtungen verdrängt, so dass der Bedarf an alternativen Korrosionsbeschichtungen für Metallteile im Automobilbereich stark gestiegen ist. Vor allem im Bereich der Verbindungstechnik mit sehr hohen Anforderungen bezüglich geringer Schichtdicke in Verbindung mit hoher Korrosi- onsbeständigkeit gibt es derzeit noch keine große Auswahl an geeigneten Beschichtungen. Hier werden vor allem Dickschichtpassivierungen, Topcoats und Versiegelungen eingesetzt, welche vor allem auf Zinkschichten zum Einsatz kommen. Die genannten Alternativoberflächen können die Verschraubungssitua- tionen, wie beispielsweise das Setzverhalten, negativ beeinflussen oder Proble- me durch Medienunverträglichkeit oder funktionell kritische Partikelbildung verursachen. Zudem wird bei Schraubverbindungen fast immer der Reibbeiwert durch eine der genannten Behandlungen erhöht. The regulation is replacing Cr (VI) -containing coatings, so that the demand for alternative corrosion coatings for metal parts in the automotive sector has risen sharply. Especially in the field of connection technology with very high requirements in terms of low layer thickness in conjunction with high corrosion resistance, there is currently no large selection of suitable coatings. In particular, thick-layer passivation, topcoats and sealants are used here, which are mainly used on zinc layers. The mentioned alternative surfaces can adversely affect the screwing situations, such as the setting behavior, for example, or cause problems due to media incompatibility or functionally critical particle formation. In addition, in the case of screw connections, the coefficient of friction is almost always increased by one of the aforementioned treatments.
Im Stand der Technik wird bezüglich hoher Korrosionsbeständigkeit die Be- Schichtung mit einer Zink-Nickel-Oberfläche ausgeführt. Diese wird besonders imIn the prior art, the coating with a zinc-nickel surface is carried out with regard to high corrosion resistance. This is especially in the
Schraubenbereich bei hohen Anforderungen mit steigender Tendenz eingesetzt.Screw range used with high demands with increasing tendency.
Der Nachteil dieser Beschichtung liegt im Aufbau der Schicht an der Oberfläche.The disadvantage of this coating lies in the structure of the layer on the surface.
Diese Schicht wirkt reibungserhohend und dadurch verändern sich die Parameter z.B. bei Verschraubungssituationen bis hin zur Überschreitung des maximal zu- lässigen Drehmomentes. Insbesondere bei selbstfurchenden Schrauben wird diese Grenze bei Zink-Nickel beschichteten Schrauben schnell überschritten.This layer has a high friction and as a result the parameters change, e.g. in screwing situations up to exceeding the maximum permissible torque. Especially with self-tapping screws, this limit is quickly exceeded in zinc-nickel coated screws.
Auch andere Prozesse, wie z.B. Einpressprozesse, werden negativ beeinflusst.Also other processes, such as Press-in processes are negatively influenced.
Teilweise wird versucht, dieses Problem mittels zusätzlichen reibungsreduzie- renden Topcoats zu lösen. Diese reichen jedoch meist nicht aus, um die vorhan- denen Probleme zu eliminieren. Wie aus Fig. 1 ersichtlich ist, umfasst das dargestellte Ausführungsbeispiel eines erfindungsgemäßen Befestigungsmittels 10 einen Grundkörper 12 aus einem Grundmetall, auf weichen mindestens eine korrosionsbeständige Schicht 14 aufgebracht ist, die beispielsweise als Zink-Nickel-Schicht und/oder Eisen-Zink- Schicht ausgeführt ist. Erfindungsgemäß ist auf die mindestens eine korrosionsbeständige Schicht 14 zumindest teilweise eine weitere Schicht 16 aufgebracht, welche einen kleineren Reibbeiwert als die mindestens eine korrosionsbeständige Schicht 14 aufweist. Im dargestellten Ausführungsbeispiel ist die weitere Schicht 16 als Abschlussschicht ausgeführt und direkt auf die korrosionsbeständige Schicht 14 aufgebracht. Alternativ können zwischen der korrosionsbeständigen Schicht 14 und der weiteren Schicht 16 noch weitere Zwischenschichten angeordnet werden. Zudem kann über die weitere Schicht 16 noch eine Abschlussschicht, wie beispielsweise eine Lackschicht aufgebracht werden. Die weitere Schicht 16 kann beispielsweise als Zinkschicht und/oder Aluminiumschicht und/oder Zinnschicht und/oder Kupferschicht und/oder Kohlenstoffschicht ausgeführt werden und weist eine Stärke im Bereich von ungefähr 1 bis 15μηι auf. Für den Einsatz im Kraftfahrzeug umfasst der Grundkörper 12 beispielsweise ein selbstfurchendes Gewinde. Die erfindungsgemäße weitere Schicht 16 wirkt reibungsreduzierend, so dass dieSome attempts are made to solve this problem by means of additional friction-reducing topcoats. However, these are usually not sufficient to eliminate the existing problems. As can be seen from FIG. 1, the illustrated exemplary embodiment of a fastening means 10 according to the invention comprises a base body 12 made of a base metal on which at least one corrosion-resistant layer 14 is applied, which is embodied, for example, as a zinc-nickel layer and / or iron-zinc layer is. According to the invention, at least one further layer 16, which has a smaller coefficient of friction than the at least one corrosion-resistant layer 14, is at least partially applied to the at least one corrosion-resistant layer 14. In the illustrated embodiment, the further layer 16 is designed as a finishing layer and applied directly to the corrosion-resistant layer 14. Alternatively, further intermediate layers can be arranged between the corrosion-resistant layer 14 and the further layer 16. In addition, a further layer, such as a lacquer layer, can be applied over the further layer 16. The further layer 16 can be embodied, for example, as a zinc layer and / or aluminum layer and / or tin layer and / or copper layer and / or carbon layer and has a thickness in the range from approximately 1 to 15 μm. For use in motor vehicles, the base body 12 comprises, for example, a self-tapping thread. The further layer 16 according to the invention has a friction-reducing effect, so that the
Verschraubungssituationen im Kraftfahrzeug, insbesondere bei selbstfurchenden Schrauben mit einer korrosionsbeständigen Zink-Nickel-Schicht, in vorteilhafter Weise verbessert und eine Überschreitung des maximal zulässigen Drehmomentes verhindert werden kann. Zudem werden durch die reibungsreduzierende Ab- schlussschicht 16 auch andere Prozesse, wie beispielsweise Einpressprozesse positiv beeinflusst. Screwing situations in the motor vehicle, especially in self-tapping screws with a corrosion-resistant zinc-nickel layer, advantageously improved and exceeding the maximum allowable torque can be prevented. In addition, the friction-reducing sealing layer 16 also positively influences other processes, such as, for example, injection-molding processes.
Das erfindungsgemäße Verfahren zur Herstellung eines Befestigungsmittels 10 mit einem Grundkörper 12 aus einem Grundmetall bringt mindestens eine korro- sionsbeständige Schicht 14 auf den Grundkörper auf. Anschließend wird auf die mindestens eine korrosionsbeständige Schicht 14 erfindungsgemäß zumindest teilweise eine weitere Schicht 16 aufgebracht, welche einen kleineren Reibbeiwert als die mindestens eine korrosionsbeständige Schicht 14 aufweist. Die korrosionsbeständige Schicht 14 kann beispielsweise durch ein galvanisches Ver- fahren und/oder ein nasschemisches Verfahren und/oder ein Sprühverfahren und/oder ein Tauchverfahren auf das Grundmetall 12 aufgebracht werden. Auch die weitere Schicht 16 kann durch ein galvanisches Verfahren und/oder ein nasschemisches Verfahren und/oder ein Sprühverfahren und/oder ein Tauchverfahren direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht 14 aufgebracht werden. Die als Zinkschicht ausgeführte weitere Schicht 16 kann durch einen Feuerverzinkungsvorgang direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht 14 aufgebracht werden. The inventive method for producing a fastening means 10 with a base body 12 made of a parent metal brings at least one corrosion-resistant layer 14 on the base body. Subsequently, according to the invention, at least one further layer 16 is applied to the at least one corrosion-resistant layer 14, which has a smaller coefficient of friction than the at least one corrosion-resistant layer 14. The corrosion-resistant layer 14 can be applied to the base metal 12, for example, by a galvanic method and / or a wet-chemical method and / or a spraying method and / or a dipping method. Also The further layer 16 can be applied to the corrosion-resistant layer 14 directly or via at least one intermediate layer by means of a galvanic method and / or a wet-chemical method and / or a spraying method and / or a dipping method. The further layer 16 embodied as a zinc layer can be applied to the corrosion-resistant layer 14 directly or via at least one intermediate layer by means of a hot-dip galvanizing process.
Der wesentliche Vorteil der vorliegenden Erfindung besteht darin, dass Befesti- gungsmittel mit hoher Korrosionsbeständigkeit zur Verfügung gestellt werden, die gleichzeitig gute Schmiereigenschaften bzw. reduzierte Reibbeiwerte aufweisen. The essential advantage of the present invention is that fastening means are provided with high corrosion resistance, which at the same time have good lubricating properties or reduced coefficients of friction.

Claims

Ansprüche claims
1 . Befestigungsmittel mit einem Grundkörper (12) aus einem Grundmetall, auf welchen mindestens eine korrosionsbeständige Schicht (14) aufgebracht ist, dadurch gekennzeichnet, dass auf die mindestens eine korrosionsbeständige Schicht (14) zumindest teilweise eine weitere Schicht (16) aufgebracht ist, welche einen kleineren Reibbeiwert als die mindestens eine korrosionsbeständige Schicht (14) aufweist. 1 . Fastening means having a base body (12) of a base metal, on which at least one corrosion-resistant layer (14) is applied, characterized in that on the at least one corrosion-resistant layer (14) at least partially a further layer (16) is applied, which has a smaller Frictional coefficient than the at least one corrosion-resistant layer (14).
2. Befestigungsmittel nach Anspruch 1 , dadurch gekennzeichnet, dass die weitere Schicht (16) direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht (14) aufgebracht ist. 2. Fastening means according to claim 1, characterized in that the further layer (16) is applied directly or via at least one intermediate layer on the corrosion-resistant layer (14).
3. Befestigungsmittel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die korrosionsbeständige Schicht (14) als Zink-Nickel-Schicht und/oder Eisen-Zink- Schicht ausgeführt ist. 3. Fastening means according to claim 1 or 2, characterized in that the corrosion-resistant layer (14) is designed as a zinc-nickel layer and / or iron-zinc layer.
4. Befestigungsmittel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die weitere Schicht (16) als Zinkschicht und/oder Aluminiumschicht und/oder Zinnschicht und/oder Kupferschicht und/oder Kohlenstoffschicht ausgeführt ist. 4. Fastening means according to one of claims 1 to 3, characterized in that the further layer (16) is designed as a zinc layer and / or aluminum layer and / or tin layer and / or copper layer and / or carbon layer.
5. Befestigungsmittel nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die weitere Schicht (16) eine Stärke in einem Bereich von ungefähr 1 bis 15μηι aufweist. 5. Fastening means according to one of claims 1 to 4, characterized in that the further layer (16) has a thickness in a range of about 1 to 15μηι.
6. Befestigungsmittel nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Grundkörper (12) ein Gewinde, insbesondere ein selbstfurchendes Gewinde umfasst. 6. Fastening means according to one of claims 1 to 5, characterized in that the base body (12) comprises a thread, in particular a self-tapping thread.
7. Verfahren zur Herstellung eines Befestigungsmittels, insbesondere des Befestigungsmittels nach einem der Ansprüche 1 bis 6, mit einem Grundkörper (12) aus einem Grundmetall, auf weichen mindestens eine korrosionsbeständige Schicht (14) aufgebracht wird, dadurch gekennzeichnet, dass auf die korrosionsbeständige Schicht (14) eine weitere Schicht (16) aufgebracht wird, welche einen kleineren Reibbeiwert als die mindestens eine korrosionsbeständige Schicht (14) aufweist. 7. A method for producing a fastening means, in particular the fastening means according to one of claims 1 to 6, with a base body (12) made of a base metal, on soft at least one corrosion-resistant layer (14) is applied, characterized in that on the corrosion-resistant layer ( 14) a further layer (16) is applied, which has a smaller coefficient of friction than the at least one corrosion-resistant layer (14).
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die korrosionsbeständige Schicht (14) durch ein galvanisches Verfahren und/oder nasschemisches Verfahren und/oder Sprühverfahren und/oder Tauchverfahren auf das Grundmetall aufgebracht wird. 8. The method according to claim 7, characterized in that the corrosion-resistant layer (14) by a galvanic method and / or wet-chemical method and / or spraying method and / or dipping method is applied to the base metal.
9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die weitere Schicht (16) durch ein galvanisches Verfahren und/oder nasschemisches Verfahren und/oder Sprühverfahren und/oder Tauchverfahren direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht (14) aufgebracht wird. 9. The method according to claim 7 or 8, characterized in that the further layer (16) applied by a galvanic method and / or wet chemical method and / or spraying method and / or dipping method directly or via at least one intermediate layer on the corrosion-resistant layer (14) becomes.
10. Verfahren nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass die als Zinkschicht ausgeführte weitere Schicht (16) durch einen Feuerverzinkungs- vorgang direkt oder über mindestens eine Zwischenschicht auf die korrosionsbeständige Schicht (14) aufgebracht wird. 10. The method according to any one of claims 7 to 9, characterized in that the executed as a zinc layer further layer (16) by a hot dip galvanizing process directly or via at least one intermediate layer on the corrosion-resistant layer (14) is applied.
EP11701214A 2010-03-04 2011-01-12 Fastening means and associated production method Withdrawn EP2542790A1 (en)

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WO2011107303A1 (en) 2011-09-09
JP2013521445A (en) 2013-06-10

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