EP0860043B1 - Process for deposition and manufacturing electrodes for spark plugs of internal combustion engines - Google Patents
Process for deposition and manufacturing electrodes for spark plugs of internal combustion engines Download PDFInfo
- Publication number
- EP0860043B1 EP0860043B1 EP97936587A EP97936587A EP0860043B1 EP 0860043 B1 EP0860043 B1 EP 0860043B1 EP 97936587 A EP97936587 A EP 97936587A EP 97936587 A EP97936587 A EP 97936587A EP 0860043 B1 EP0860043 B1 EP 0860043B1
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- European Patent Office
- Prior art keywords
- electrode
- wear
- resistant layer
- coating
- face
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/39—Selection of materials for electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
Definitions
- the invention is based on a method for coating and producing an electrode for spark plugs for internal combustion engines.
- an electrode in particular a center and / or ground electrode for igniting flammable mixtures, is already known, in which the surface acting as the spark transfer surface has an electrically conductive, particularly erosion-resistant and well-adhering first coating and a second coating, which the a low electron work function.
- the coating takes place in the plasma spraying process.
- Common spark plugs generally have a center electrode and a ground electrode, the tips of the two electrodes being arranged with respect to one another in such a way that a spark gap is left free. Due to the constant generation of sparks between the two electrodes, the tips are subject to considerable wear. This problem places high demands on the temperature resistance, corrosion resistance and thermal expansion characteristics of the electrode tip. Spark erosion and oxidation phenomena also lead to considerable stresses.
- a method for coating the electrode tips with corrosion-resistant materials is known from DE 40 39 778. According to this publication, electrode base bodies or even only the electrode tips are provided with an intermetallic phase. This manufacture of intermetallic Phase can be complex for production. In addition, the intermetallic phases show a very brittle behavior. In the case of alloying intermetallic phases, the corrosion and oxidation resistance is significantly reduced.
- the inventive method for coating and the inventive method for producing an electrode for spark plugs for internal combustion engines with the features of the independent claims has the advantage that the wear protection layer is applied by means of laser powder coating, its use in production is considerably easier and the combination of chemically different materials little mutual mixing allowed.
- Laser powder coating also sometimes referred to as laser spraying
- the laser coating process has the advantage that it can be used to apply strictly limited and precise coatings.
- Partial areas of the electrodes are coated, such as electrode tips, electrode jacket areas, electrode areas with notches or conical recesses.
- FIG. 1 shows the schematic production process for producing an electrode for spark plugs with a corrosion-resistant coating
- FIG. 2 and FIG. 3 show two examples of coated electrode bodies.
- the invention uses a modern coating method for the production of wear protection layers such. B. for spark plug electrodes.
- Thermal spraying as a modern surface technology offers a wide range of applications. In this way, components made of a wide variety of basic materials made of metal, with layers of refractory metals, oxides and metal ceramics can be provided for protection against wear and corrosion. Almost all coating materials that can be produced in powder form can be processed.
- the Spray additive is fed to a high-energy heat source and melted. The molten particles of the coating material are accelerated in the direction of a substrate and usually hit at high speed to form a layer. The substrate is usually subject to only a slight thermal load during the process.
- the spray jet is spatially limited in all processes, but there are considerable spray losses.
- Laser spraying in which the coating material is slowly blown into the focus area of a laser beam using a carrier gas. At the same time, the substrate is melted by the laser beam, so that a connection is created between the substrate and the coating material in the melt.
- Laser spraying is characterized by the fact that it is a real one-step process. Previously, a workpiece surface was first coated and then treated in a second step with the help of a laser beam. This procedure combines both steps. Laser spraying is mostly used with CO 2 lasers with a net output of a few kilowatts.
- Thermally sprayed layers are characterized by layer thicknesses in the range from 100 ⁇ m to a few mm, whereby the binding mechanism is based either on mechanical clamping, adhesion, diffusion, chemical bonding or electrostatic forces.
- electrodes made of various basic materials can be provided with wear protection layers made of refractory metals, alloys, metal ceramics and other compounds (silicides, oxides, aluminides, borides, nitrides, carbides) against spark erosion wear and corrosion wear. This is particularly the copper, which is otherwise difficult to coat, which is the good heat conductor of the core of an electrode Composite material forms easily coatable by means of laser powder coating.
- the alloys NiCr 31 Al 11 Y 0.5 and RuAl 11 have proven particularly suitable for the coating and particularly wear-resistant. After thermal shock testing and runtime investigations, these materials show a significantly improved stability compared to previously used wear protection layers.
- Figure 1 shows the schematic manufacturing process for the manufacture of spark plug electrodes from a composite wire.
- station S1 the nickel-coated copper wire, the starting material for the electrodes, is pulled off a roll and calibrated.
- Station S2 produces the dimensionally accurate wire sections 1 which are upset in station S3 in order to produce the electrode seat 8.
- station S4 the wear-resistant layer is applied with a laser after the basic electrode body has been assembled.
- the electrode, which is now fully coated, is post-treated and burrs z. B. removed by grinding. The electrode is installed in the ceramic body after its completion.
- FIG. 2 shows a center electrode 1 which was coated by the method according to the invention from FIG. 1. It can be seen that even thin layers can be applied very precisely with this method. The geometry of the workpieces is also irrelevant.
- the coating takes place before the electrode is installed in the ceramic body. At the transition point 5 between the jacket coating 4 and the electrode body 1, there are well-separated phases between the electrode body and the coating, which for example have a thickness of 0.5 mm.
- the electrode base body must be configured for the coating in the area of the coating.
- the nickel-coated copper wire is reduced to a reduced or non-cutting Brought diameter. Care must be taken to ensure that the copper core is not exposed, otherwise there will be signs of corrosion.
- a thermal process with strong beam bundling must be used, ie laser or electron beam pointed process. A plasma jet would result in a too wide thermal range.
- the counter electrode 3, which is installed in the candle housing 2 can also be provided with a coating, which in this example is applied in a conical depression 7.
- the coating can be carried out after the electrode is installed in the housing, if a laser spraying process is used.
- other electrodes can also be provided with wear protection layers.
- the coating of almost any geometric shape is possible. End or outer surface coatings of extruded middle electrodes, coatings of profile wires for ground electrodes, or coatings of electrode blanks or boards can be carried out.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Spark Plugs (AREA)
- Coating By Spraying Or Casting (AREA)
Description
Die Erfindung geht von einem Verfahren zur Beschichtung und Herstellung einer Elektrode für Zündkerzen für Brennkraftmaschinen aus. Aus der DE 36 12 135 A1 ist bereits eine Elektrode insbesondere Mittel- und/oder Masseelektrode zum Zünden brennbarer Gemische bekannt, bei welcher die als Funkenübergangsfläche wirkende Oberfläche eine elektrisch leitende, besonders abbrandfeste und gut haftende erste Beschichtung und eine zweite Beschichtung aufweist, die der ersten Beschichtung eine geringe Elektronen-Austrittsarbeit vermittelt. Die Beschichtung erfolgt im Plasmaspritzverfahren.The invention is based on a method for coating and producing an electrode for spark plugs for internal combustion engines. From DE 36 12 135 A1 an electrode, in particular a center and / or ground electrode for igniting flammable mixtures, is already known, in which the surface acting as the spark transfer surface has an electrically conductive, particularly erosion-resistant and well-adhering first coating and a second coating, which the a low electron work function. The coating takes place in the plasma spraying process.
Gängige Zündkerzen besitzen in der Regel eine Mittelelektrode und eine Masseelektrode, wobei die Spitzen beider Elektroden so zueinander angeordnet sind, daß eine Funkenstrecke frei gelassen ist. Durch die dauernde Funkenerzeugung zwischen beiden Elektroden unterliegen die Spitzen einem erheblichen Verschleiß. Dieses Problem stellt hohe Anforderung an die Temperaturfestigkeit, Korrosionsbeständigkeit und Wärmeausdehnungscharakteristik der Elektrodenspitze dar. Funkenerosion und Oxidationserscheinungen führen ebenfalls zu erheblichen Beanspruchungen.
Aus der DE 40 39 778 ist ein Verfahren zur Beschichtung der Elektrodenspitzen mit korrosionsfesten Materialien bekannt. Nach dieser Druckschrift werden Elektrodengrundkörper oder auch nur die Elektrodenspitzen mit einer intermetallischen Phase versehen. Diese Herstellung der intermetallischen Phase kann für die Produktion aufwendig sein. Darüber hinaus zeigen die intermetallischen Phasen ein sehr sprödes Verhalten. Im Falle des Legierens von intermetallischen Phasen wird die Korrosions- und Oxidationsbeständigkeit erheblich herabgesetzt.Common spark plugs generally have a center electrode and a ground electrode, the tips of the two electrodes being arranged with respect to one another in such a way that a spark gap is left free. Due to the constant generation of sparks between the two electrodes, the tips are subject to considerable wear. This problem places high demands on the temperature resistance, corrosion resistance and thermal expansion characteristics of the electrode tip. Spark erosion and oxidation phenomena also lead to considerable stresses.
A method for coating the electrode tips with corrosion-resistant materials is known from DE 40 39 778. According to this publication, electrode base bodies or even only the electrode tips are provided with an intermetallic phase. This manufacture of intermetallic Phase can be complex for production. In addition, the intermetallic phases show a very brittle behavior. In the case of alloying intermetallic phases, the corrosion and oxidation resistance is significantly reduced.
Das erfindungsgemäße Verfahren zur Beschichtung und das erfindungsgemäße Verfahren zur Herstellung einer Elektrode für Zündkerzen für Brennkraftmaschinen mit den Merkmalen der nebengeordneten Ansprüche hat den Vorteil, daß die Verschleißschutzschicht mittels Laserpulverbeschichtung aufgebracht wird, dessen Einsatz in der Produktion erheblich einfacher ist und den Verbund chemisch unterschiedlicher Werkstoffe mit geringer gegenseitiger Aufmischung erlaubt. Das Laserpulverbeschichten (auch gelegentlich als Laserspritzen bezeichnet) erlaubt die Aufbringung der Verschleißschutzschicht einlagig in einem einzigen Arbeitsschritt. Es wird mit diesem Verfahren eine sehr gute Haftung auf allen Materialien der Elektroden, die in der Regel aus einem Verbundmaterial (Kupferkern mit Ummantelung auf Basis einer Nickellegierung) bestehen, erreicht. Das Laser-Beschichtungsverfahren hat den Vorteil, daß damit streng begrenzte und punktgenaue Beschichtungen aufgebracht werden können.The inventive method for coating and the inventive method for producing an electrode for spark plugs for internal combustion engines with the features of the independent claims has the advantage that the wear protection layer is applied by means of laser powder coating, its use in production is considerably easier and the combination of chemically different materials little mutual mixing allowed. Laser powder coating (also sometimes referred to as laser spraying) allows the wear protection layer to be applied in one layer in a single step. With this method, very good adhesion is achieved on all materials of the electrodes, which generally consist of a composite material (copper core with a sheath based on a nickel alloy). The laser coating process has the advantage that it can be used to apply strictly limited and precise coatings.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahrens möglich.Advantageous further developments and improvements of the method specified in the main claim are possible through the measures listed in the subclaims.
Besonders vorteilhaft ist es, daß unterschiedlichste Materialien als Korrosionsschutz für die Elektrodenspitze aufgebracht werden können. Dabei sind mit Materialien wie Metalle, Legierungen von Metallen, Metallkeramiken, oder Oxide usw. denkbar.It is particularly advantageous that a wide variety of materials can be applied as corrosion protection for the electrode tip. Materials such as metals, alloys of metals, metal ceramics, or oxides etc. are conceivable.
Dabei werden Teilbereiche der Elektroden beschichtet, wie Elektrodenspitzen, Elektrodenmantelbereiche, Elektrodenflächen mit Einkerbungen oder kegelförmigen Aussparungen.Partial areas of the electrodes are coated, such as electrode tips, electrode jacket areas, electrode areas with notches or conical recesses.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigt Figur 1 den schematischen Produktionsablauf zur Herstellung einer Elektrode für Zündkerzen mit einer korrosionsfesten Beschichtung, Figur 2 und Figur 3 zwei Beispiele für beschichtete Elektrodenkörper.Embodiments of the invention are shown in the drawing and explained in more detail in the following description. 1 shows the schematic production process for producing an electrode for spark plugs with a corrosion-resistant coating, FIG. 2 and FIG. 3 show two examples of coated electrode bodies.
Die Erfindung verwendet ein modernes Beschichtungsverfahren zur Herstellung von Verschleißschutzschichten z. B. für Zündkerzenelektroden. Das thermische Spritzen als moderne Oberflächentechnologie bietet dabei vielfältige Anwendungsmöglichkeiten. Damit lassen sich Bauteile aus verschiedensten Grundstoffen im erfindungsgemäßen Fall aus Metall, mit Schichten aus hochschmelzenden Metallen, Oxiden und Metallkeramiken zum Schutz vor Verschleiß und Korrosion versehen. Es können nahezu alle Beschichtungswerkstoffe, die in Pulverform herstellbar sind, verarbeitet werden. Der Spritzzusatz wird einer energiereichen Wärmequelle zugeführt und aufgeschmolzen. Die schmelzflüssigen Partikel des Beschichtungsstoffes werden in Richtung eines Substrats beschleunigt und treffen mit meist hoher Geschwindigkeit auf, um eine Schicht zu bilden. Das Substrat unterliegt während des Prozesses in der Regel einer nur geringen thermischen Belastung. Der Spritzstrahl ist bei allen Verfahren räumlich stark begrenzt, dennoch liegen erhebliche Spritzverluste vor. Eine Ausnahme bildet da das Laserspritzen, bei welchem der Beschichtungswerkstoff mit Hilfe eines Trägergases langsam in den Fokusbereich eines Laserstrahls geblasen wird. Gleichzeitig wird durch den Laserstrahl das Substrat aufgeschmolzen, so daß in der Schmelze eine Verbindung zwischen Substrat und Beschichtungswerkstoff entsteht. Das Laserspritzen zeichnet sich dadurch aus, daß es sich um ein echtes Einstufenverfahren handelt. Bisher wurde eine Werkstückoberfläche zunächst beschichtet und anschließend in einem zweiten Arbeitsgang mit Hilfe eines Laserstrahls nachbehandelt. Bei diesem Verfahren werden beide Schritte kombiniert. Das Laserspritzen wird zumeist mit CO2-Laser mit Nettoleistungen von einigen Kilowatt eingesetzt. Thermisch gespritzte Schichten zeichnen sich durch Schichtdicken im Bereich von 100 µm bis zu einigen mm aus, wobei der Bindungsmechanismus entweder auf mechanischer Verklammerung, Adhäsion, Diffusion, chemischer Bindung oder elektrostatischen Kräften beruht. Mit dem Laserpulverbeschichten können Elektroden aus verschiedenen Grundwerkstoffen mit Verschleißschutzschichten aus hochschmelzenden Metallen, Legierungen, Metallkeramiken und anderen Verbindungen (Silizide, Oxide, Aluminide, Boride, Nitride, Carbide) gegen Funkenerrosionsverschleiß und Korrosionsverschleiß versehen werden. Hierbei ist besonders das sonst nur unter schwer zu beschichtende Kupfer, welches als guter Wärmeleiter den Kern einer Elektrode aus Verbundmaterial bildet, mittels Laserpulverbeschichten gut beschichtbar. Besonders geeignet für die Beschichtung und besonders verschleißfest haben sich die Legierungen NiCr31Al11Y0,5 und RuAl11 erwiesen. Diese Materialien weisen nach Thermoschockprüfung und Laufzeituntersuchungen eine deutlich verbesserte Standfestigkeit im Vergleich zu bisher verwendeten Verschleißschutzschichten auf.The invention uses a modern coating method for the production of wear protection layers such. B. for spark plug electrodes. Thermal spraying as a modern surface technology offers a wide range of applications. In this way, components made of a wide variety of basic materials made of metal, with layers of refractory metals, oxides and metal ceramics can be provided for protection against wear and corrosion. Almost all coating materials that can be produced in powder form can be processed. The Spray additive is fed to a high-energy heat source and melted. The molten particles of the coating material are accelerated in the direction of a substrate and usually hit at high speed to form a layer. The substrate is usually subject to only a slight thermal load during the process. The spray jet is spatially limited in all processes, but there are considerable spray losses. An exception to this is laser spraying, in which the coating material is slowly blown into the focus area of a laser beam using a carrier gas. At the same time, the substrate is melted by the laser beam, so that a connection is created between the substrate and the coating material in the melt. Laser spraying is characterized by the fact that it is a real one-step process. Previously, a workpiece surface was first coated and then treated in a second step with the help of a laser beam. This procedure combines both steps. Laser spraying is mostly used with CO 2 lasers with a net output of a few kilowatts. Thermally sprayed layers are characterized by layer thicknesses in the range from 100 µm to a few mm, whereby the binding mechanism is based either on mechanical clamping, adhesion, diffusion, chemical bonding or electrostatic forces. With laser powder coating, electrodes made of various basic materials can be provided with wear protection layers made of refractory metals, alloys, metal ceramics and other compounds (silicides, oxides, aluminides, borides, nitrides, carbides) against spark erosion wear and corrosion wear. This is particularly the copper, which is otherwise difficult to coat, which is the good heat conductor of the core of an electrode Composite material forms easily coatable by means of laser powder coating. The alloys NiCr 31 Al 11 Y 0.5 and RuAl 11 have proven particularly suitable for the coating and particularly wear-resistant. After thermal shock testing and runtime investigations, these materials show a significantly improved stability compared to previously used wear protection layers.
Figur 1 zeigt den schematischen Fertigungsablauf zur Fertigung von Zündkerzenelektroden aus einem Verbunddraht. In der Station S1 wird der nickelummantelte Kupferdraht, das Ausgangsmaterial für die Elektroden, von einer Rolle abgezogen und kalibriert. Station S2 stellt die maßgenauen Drahtabschnitte 1 her, die in Station S3 angestaucht werden, um den Elektrodensitz 8 herzustellen. In Station S4 wird mit einem Laser die verschleißfeste Schicht aufgebracht, nachdem der Elektrodengrundkörper konfektioniert wurde. In einer letzten Station S5 wird die Elektrode, die nun fertig beschichtet vorliegt, nachbehandelt, und Grate z. B. durch Abschleifen entfernt. Die Elektrode wird nach ihrer Fertigstellung in den Keramikkörper verbaut.Figure 1 shows the schematic manufacturing process for the manufacture of spark plug electrodes from a composite wire. In station S1, the nickel-coated copper wire, the starting material for the electrodes, is pulled off a roll and calibrated. Station S2 produces the dimensionally accurate wire sections 1 which are upset in station S3 in order to produce the electrode seat 8. In station S4, the wear-resistant layer is applied with a laser after the basic electrode body has been assembled. In a last station S5, the electrode, which is now fully coated, is post-treated and burrs z. B. removed by grinding. The electrode is installed in the ceramic body after its completion.
Figur 2 zeigt eine Mittelelektrode 1, die nach dem erfindungsgemäßen Verfahren aus Fig. 1 beschichtet wurde. Man erkennt, daß mit diesem Verfahren sehr präzise auch dünne Schichten aufgebracht werden können. Dabei spielt auch die Geometrie der Werkstücke keine Rolle. Die Beschichtung erfolgt vor dem Einbau der Elektrode in den Keramikkörper. An der Übergangsstelle 5 zwischen Mantelbeschichtung 4 und Elektrodenkörper 1 gibt es gut getrennte Phasen zwischen Elektrodenkörper und Beschichtung, die beispielsweise einen Dicke von 0,5 mm aufweist. Der Elektrodengrundkörper muß im Bereich der Beschichtung für die Beschichtung konfiguriert werden. Im Beispiel der Fig. 2 wird der nickelummantelte Kupferdraht spanend oder nichtspanend auf einen reduzierten Durchmesser gebracht. Dabei muß darauf geachtet werden, daß der Kupferkern nicht bloßgelegt wird, da es sonst zu Korrosionserscheinungen kommt. Soll, wie in Fig. 2, die Stirnfläche nicht beschichtet werden, muß ein thermisches Verfahren mit einer starken Bündelung des Strahles eingesetzt werden, d. h. Laser- oder Elektronenstrahlspitzverfahren. Ein Plasmastrahl ergäbe einen zu breiten thermischen Bereich.FIG. 2 shows a center electrode 1 which was coated by the method according to the invention from FIG. 1. It can be seen that even thin layers can be applied very precisely with this method. The geometry of the workpieces is also irrelevant. The coating takes place before the electrode is installed in the ceramic body. At the transition point 5 between the jacket coating 4 and the electrode body 1, there are well-separated phases between the electrode body and the coating, which for example have a thickness of 0.5 mm. The electrode base body must be configured for the coating in the area of the coating. In the example in FIG. 2, the nickel-coated copper wire is reduced to a reduced or non-cutting Brought diameter. Care must be taken to ensure that the copper core is not exposed, otherwise there will be signs of corrosion. If, as in FIG. 2, the end face is not to be coated, a thermal process with strong beam bundling must be used, ie laser or electron beam pointed process. A plasma jet would result in a too wide thermal range.
Wie in Figur 3 zu sehen, kann auch die Gegenelektrode 3, die im Kerzengehäuse 2 installiert ist, mit einer Beschichtung, die in diesem Beispiel in einer kegelförmigen Vertiefung 7 aufgebracht wird, versehen werden. Hier kann die Beschichtung vorgenommen werden, nachdem die Elektrode im Gehäuse verbaut ist, wenn man ein Laserspritzverfahren einsetzt.As can be seen in FIG. 3, the counter electrode 3, which is installed in the candle housing 2, can also be provided with a coating, which in this example is applied in a conical depression 7. Here the coating can be carried out after the electrode is installed in the housing, if a laser spraying process is used.
Über die Beschichtungsverfahren für Mittelelektroden hinaus, können auch andere Elektroden mit Verschleißschutzschichten versehen werden. Hierbei ist die Beschichtung fast jeder geometrischen Form möglich. Es können Stirn- oder Mantelflächenbeschichtungen von fließgepreßten Mittelelektroden, Beschichtungen von Profildrähten für Masseelektroden, oder Beschichtungen von Elektrodenronden oder -platinen vorgenommen werden.In addition to the coating process for central electrodes, other electrodes can also be provided with wear protection layers. The coating of almost any geometric shape is possible. End or outer surface coatings of extruded middle electrodes, coatings of profile wires for ground electrodes, or coatings of electrode blanks or boards can be carried out.
Claims (8)
- Method for coating an electrode (1, 3) for spark plugs for internal-combustion engines, in which a wear-resistant layer (4) is applied to the electrode (1, 3) characterized in that a laser serves as heat source for the coating of the electrode (1, 3) and the wear-resistant layer (4) is applied in one step by means of laser powder coating using pulverulent coating material.
- Method according to Claim 1, characterized in that the wear-resistant layer (4) is formed from metals or from alloys of metals, preferably from nickel alloys or noble-metal compounds.
- Method according to Claim 1, characterized in that the wear-resistant layer (4) is formed from metal ceramics.
- Method according to Claim 1, characterized in that the wear-resistant layer (4) is formed from metal compounds.
- Method according to Claim 1, characterized in that the end face (6) and/or the peripheral face at the tip of a centre electrode (1) is provided with a wear-resistant layer (4).
- Method according to Claim 1, characterized in that a chamfered face (7) at the tip and/or the end face of a side electrode (3) is provided with a wear-resistant layer (4).
- Method according to Claim 1, characterized in that a conically recessed face (7) at the tip of a side electrode (3) is provided with a wear-resistant layer (4).
- Method of producing an electrode (1, 3) for spark plugs for internal-combustion engines having a wear-resistant layer (4) applied to the electrode (1, 3), comprising the following method steps:a) calibration (S1) of the base wire serving as starting material for the electrodes (1, 3)b) shearing off (S2) of dimensionally accurate sectionsc) upsetting (S3) of the electrode tip and preparation of the face to be coatedd) application (S4) of the wear-resistant layer (4) by laser powder coating.e) aftertreatment (S5)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19631985 | 1996-08-08 | ||
| DE19631985A DE19631985A1 (en) | 1996-08-08 | 1996-08-08 | Electrode with a wear-resistant coating, spark plug and process for its manufacture |
| PCT/DE1997/001637 WO1998007220A1 (en) | 1996-08-08 | 1997-08-02 | Electrode for spark plugs of internal combustion engines and process for manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0860043A1 EP0860043A1 (en) | 1998-08-26 |
| EP0860043B1 true EP0860043B1 (en) | 2003-01-29 |
Family
ID=7802101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97936587A Expired - Lifetime EP0860043B1 (en) | 1996-08-08 | 1997-08-02 | Process for deposition and manufacturing electrodes for spark plugs of internal combustion engines |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0860043B1 (en) |
| JP (1) | JPH11514145A (en) |
| CN (1) | CN1198848A (en) |
| BR (1) | BR9706642A (en) |
| DE (2) | DE19631985A1 (en) |
| HU (1) | HUP9901495A3 (en) |
| WO (1) | WO1998007220A1 (en) |
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|---|---|---|---|---|
| DE19939319B4 (en) * | 1999-07-29 | 2004-05-06 | Robert Bosch Gmbh | Spark plug for an internal combustion engine |
| DE10120563A1 (en) * | 2001-04-03 | 2002-11-07 | Phoenix Contact Gmbh & Co | Surge protection element and surge protection device |
| JP4069826B2 (en) * | 2003-07-30 | 2008-04-02 | 株式会社デンソー | Spark plug and manufacturing method thereof |
| DE10348778B3 (en) * | 2003-10-21 | 2005-07-07 | Robert Bosch Gmbh | Sparking plug electrode has a primary material combined with 2-20 per cent secondary material in powder pure metal form |
| DE102004023459A1 (en) * | 2004-05-12 | 2005-12-15 | Beru Ag | Method for producing a spark plug |
| DE102005018674A1 (en) * | 2005-04-21 | 2006-10-26 | Robert Bosch Gmbh | Electrode for a spark plug |
| CN101064414B (en) * | 2006-04-28 | 2010-11-03 | 柳孟柱 | Compound center electrode of vehicle plug and its preparing method |
| DE102010004345B4 (en) | 2010-01-11 | 2018-02-22 | Viessmann Werke Gmbh & Co Kg | Electrode for flame monitoring on a heating burner |
| EP2884604B1 (en) | 2012-08-09 | 2019-10-09 | NGK Spark Plug Co., Ltd. | Spark plug |
| DE102015115746B4 (en) | 2015-09-17 | 2017-04-27 | Federal-Mogul Ignition Gmbh | A method of manufacturing a spark plug ignition electrode and spark plug made therewith |
| US11870222B2 (en) | 2021-05-04 | 2024-01-09 | Federal-Mogul Ignition Gmbh | Spark plug electrode and method of manufacturing the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE686426C (en) * | 1938-02-12 | 1940-01-10 | Wippermann Jr Akt Ges | Process for the production of an erosion-proof protective coating on spark plug electrodes |
| US3947654A (en) * | 1973-10-24 | 1976-03-30 | Sirius Corporation | Method of generating laser-radio beam |
| DE3612135A1 (en) * | 1986-04-10 | 1987-10-15 | Kuno Dr Ing Kirner | Electrode for igniting combustible mixtures of gases and vapours |
| DE4039778C1 (en) * | 1990-12-13 | 1992-05-14 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
| JPH05234662A (en) * | 1991-12-27 | 1993-09-10 | Ngk Spark Plug Co Ltd | Electrode for spark plug and its manufacture |
-
1996
- 1996-08-08 DE DE19631985A patent/DE19631985A1/en not_active Withdrawn
-
1997
- 1997-08-02 HU HU9901495A patent/HUP9901495A3/en unknown
- 1997-08-02 JP JP10509285A patent/JPH11514145A/en active Pending
- 1997-08-02 EP EP97936587A patent/EP0860043B1/en not_active Expired - Lifetime
- 1997-08-02 DE DE59709228T patent/DE59709228D1/en not_active Expired - Lifetime
- 1997-08-02 WO PCT/DE1997/001637 patent/WO1998007220A1/en active IP Right Grant
- 1997-08-02 BR BR9706642A patent/BR9706642A/en not_active Application Discontinuation
- 1997-08-02 CN CN97191027A patent/CN1198848A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE59709228D1 (en) | 2003-03-06 |
| DE19631985A1 (en) | 1998-02-19 |
| HUP9901495A2 (en) | 1999-09-28 |
| JPH11514145A (en) | 1999-11-30 |
| BR9706642A (en) | 1999-01-12 |
| EP0860043A1 (en) | 1998-08-26 |
| HUP9901495A3 (en) | 2000-03-28 |
| CN1198848A (en) | 1998-11-11 |
| WO1998007220A1 (en) | 1998-02-19 |
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