EP1356555B2 - Procede pour la production d'une electrode de bougie d'allumage - Google Patents

Procede pour la production d'une electrode de bougie d'allumage Download PDF

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Publication number
EP1356555B2
EP1356555B2 EP01984728.4A EP01984728A EP1356555B2 EP 1356555 B2 EP1356555 B2 EP 1356555B2 EP 01984728 A EP01984728 A EP 01984728A EP 1356555 B2 EP1356555 B2 EP 1356555B2
Authority
EP
European Patent Office
Prior art keywords
electrode
spark plug
noble metal
precious metal
laser beam
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
EP01984728.4A
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German (de)
English (en)
Other versions
EP1356555B1 (fr
EP1356555A1 (fr
Inventor
Thomas Juestel
Heinz Ulm
Konrad Funk
Martin Klassen
Jochen Fischer
Andreas Benz
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
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Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1356555A1 publication Critical patent/EP1356555A1/fr
Application granted granted Critical
Publication of EP1356555B1 publication Critical patent/EP1356555B1/fr
Publication of EP1356555B2 publication Critical patent/EP1356555B2/fr
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Classifications

    • 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 present invention relates to a method for connecting an electrode of a spark plug with a noble metal according to the closer defined in the preamble of claim 1.
  • Spark plugs having an electrode such as e.g. A center electrode in which the forward end of the center electrode is provided with a noble metal tip or in which a noble metal is circumferentially disposed in a region has been known for some time from the prior art.
  • the spark plug having a center electrode having a heat and erosion resistant nickel alloy, the forward end of the center electrode being formed with a noble metal tip of iridium or ruthenium.
  • the nickel alloy has a thermal conductivity of about 30 Wm -1 K -1 or greater.
  • the noble metal tip has a disk-like shape and is concentrically arranged at the front end of the electrode metal.
  • laser beams are applied to a noble metal tip / front end of the electrode metal interface with the noble metal tip pressed against the leading end of the electrode metal whereupon the noble metal is to be deposited by a corresponding force.
  • EP 0 575 163 B1 describes the welding of a noble metal chip on a center electrode of a spark plug, wherein the weld at the periphery of the interface between the noble metal leaflet and the end surface of the center electrode is located.
  • a YAG laser is used for welding.
  • the EP 0 691174 A1 to derive a method in which a noble metal wire is applied to an electrode body by means of a pulsed or a continuous laser beam, wherein the noble metal wire is completely melted.
  • the material to be attached to each other i. the electrode and the precious metal, discontinuously melted and solidified again. This means that no continuous melt pool is generated.
  • a nickel alloy is used as the material for the electrode. Connecting by means of a pulsed laser beam produces unwanted, nickel-rich and thus less resistant to erosion and corrosion alloy areas.
  • the proposed method for bonding an electrode of a spark plug to a noble metal wherein the noble metal is locally connected to a generated by a continuous laser beam heat input to the electrode in a connection region, wherein the laser beam (3) is directed to the connection region, and wherein Noble metal is not completely, but only melted in the connection area, in contrast, has the advantage that the surface irregularities are reduced. At the same time, cracks, pores, voids and fluctuations in the respective alloying portions, all of which weaken the compound precious metal / electrode material, are avoided within the partially melted zone.
  • the service life of the component during operation can be increased since such weak points can be avoided or at least minimized.
  • connection partners in the contact zone avoids the solidification cracks which are known when using pulsed laser beams, the corrosion attack along these cracks is also avoided, thus preventing a premature failure of the connection. This is particularly important when using the spark plugs in the engine area.
  • the heating and cooling rate of the melt zone region can be adjusted to the particular materials and the type of compound desired, thereby also achieving a particular phase composition in the bond region.
  • a further advantage of the invention is that the spectrum of melt zone geometries achievable with a continuous laser beam is much wider than is the case with a pulsed laser.
  • the precious metal inserts is applied to an end face of the center electrode.
  • the noble metal insert on the front side of the center electrode the noble metal part is not completely melted, but only in their connection area.
  • a spark plug electrode is provided with a tip of wear-resistant precious metal.
  • the application of the noble metal by means of a continuously operating laser beam, wherein a diode laser is used.
  • FIG. 1 a schematic representation of a bonding method in which a noble metal is supplied to an electrode as a wire material
  • FIG. 2A and FIG. 2B in each case a schematic representation of a method step of a method according to the invention for connecting an electrode to a noble metal insert in the manner of a roof electrode.
  • FIG. 1 For example, a single-stage coating process of an electrode, ie, a method of bonding a spark plug electrode 1 to a noble metal 2, is shown.
  • noble metal 2 according to the present invention, a pure noble metal or any noble metal alloy can be understood, which is suitable for the particular application.
  • FIG. 1 shows in particular a section through the spark plug electrode 1, which here represents a center electrode which is filled in the region of a prefabricated groove 6 with a molten precious metal 2 and for example finds application in a Gleitfunkenkerze or Heilgleitfunkenkerze.
  • the section through the center electrode 1 according to FIG. 1 is carried out along the groove 6.
  • a continuous laser 3 is used for melting.
  • a diode laser is particularly suitable since it is significantly more advantageous in terms of investment and operating costs than an Nd: YAG or CO2 laser today.
  • the precious metal 2 which may be platinum here, for example, is supplied permanently as a wire material according to the preferred embodiment shown and with the continuous laser beam 3 in the region of the prefabricated groove 6 on the Middle electrode 1 is melted and filled as a melt 5 in the groove 6, so that the noble metal 2 is wound on the electrode 1 as it were.
  • the base material of the center electrode 1 is also fused, and an alloy of a small proportion of the melted base material of the center electrode 1 and of the material of the noble metal wire 2 is formed.
  • the heating and cooling rate can be adjusted, whereby the cracking in the melting zone and the electrode base material is further prevented or minimized. It is also possible by the variation of the heating and cooling rate, a wide variation in alloy compositions.
  • FIGS. 2A and 2B Now, an inventive manufacturing process for a further type of electrode, namely a so-called roof electrode is shown.
  • a continuously operating laser beam continuous wave or CW laser
  • CW laser continuously operating laser beam
  • a part of precious metal 2 preferably in a cylindrical shape, on a front side of the electrode 1 ', which here represents a center or ground electrode of a spark plug, placed or inserted into a recess 6 thereof.
  • the recess 6 in the end face of the electrode 1 ' is preferably formed such that upon insertion of the noble metal part 2, this fixed to the electrode 1' is connected.
  • connection partners namely precious metal 2 and spark plug electrode 1 'with a matched to the amount of energy of a CW laser speed in the direction of arrow 7.
  • the laser beam 3 is on the focused rotating and welded to a corresponding on the connection partner with respect to the melting point, the heat capacity, etc. tuned energy lamp on and off again.
  • spark plug electrode 1 ' which tip consists of a noble metal 2 or a noble metal alloy, which is permanently connected to the nickel alloy of the electrode 1' via a uniform melting zone.
  • the noble metal 2 should not be completely melted, but only in its connection region in such provided with a precious metal electrode 2 1 ', a so-called roof electrode.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Claims (8)

  1. Procédé pour relier une électrode (1, 1') d'une bougie d'allumage à un métal précieux (2), le métal précieux (2) étant relié localement à l'électrode (1, 1') par apport de chaleur au moyen d'un faisceau laser (3) travaillant en continu, le métal précieux (2) étant relié à l'électrode (1, 1') dans une zone de liaison, le faisceau laser (3) étant dirigé sur la zone de liaison, et le métal précieux (2) n'étant pas fondu complètement mais uniquement dans la zone de liaison, caractérisé en ce qu'on utilise un laser à diode.
  2. Procédé selon la revendication 1, caractérisé en ce que le métal précieux (2) est appliqué sur un côté frontal de l'électrode (1').
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'un métal précieux (2) configuré en cylindre est appliqué sur le côté frontal d'une électrode (1') et est ensuite fondu à l'aide du faisceau laser (3) au niveau de la surface frontière entre le métal précieux (2) et l'électrode (1').
  4. Electrode (1, 1') de bougie d'allumage, caractérisée en ce qu'elle est fabriquée en recourant à un procédé selon l'une des revendications précédentes.
  5. Electrode (1, 1') de bougie d'allumage selon la revendication 4, caractérisée en ce qu'elle est une électrode centrale.
  6. Electrode (1, 1') de bougie d'allumage selon la revendication 4, caractérisée en ce qu'elle est une électrode de masse.
  7. Electrode (1, 1') de bougie d'allumage selon l'une des revendications 4 à 6, caractérisée en ce qu'elle présente essentiellement du nickel.
  8. Electrode (1') de bougie d'allumage selon l'une des revendications 4 à 7, caractérisée en ce qu'elle est une électrode de toit pour bougie à étincelle glissante ou bougie à étincelle glissante à air.
EP01984728.4A 2001-01-24 2001-12-22 Procede pour la production d'une electrode de bougie d'allumage Expired - Lifetime EP1356555B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10103045 2001-01-24
DE10103045A DE10103045A1 (de) 2001-01-24 2001-01-24 Verfahren zur Herstellung einer Zündkerzenelektrode
PCT/DE2001/004927 WO2002060025A1 (fr) 2001-01-24 2001-12-22 Procede pour la production d"une electrode de bougie d"allumage

Publications (3)

Publication Number Publication Date
EP1356555A1 EP1356555A1 (fr) 2003-10-29
EP1356555B1 EP1356555B1 (fr) 2011-11-23
EP1356555B2 true EP1356555B2 (fr) 2015-10-14

Family

ID=7671539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01984728.4A Expired - Lifetime EP1356555B2 (fr) 2001-01-24 2001-12-22 Procede pour la production d'une electrode de bougie d'allumage

Country Status (8)

Country Link
US (1) US7192324B2 (fr)
EP (1) EP1356555B2 (fr)
JP (1) JP2004517459A (fr)
CN (1) CN100409518C (fr)
BR (1) BR0109425B1 (fr)
DE (1) DE10103045A1 (fr)
RU (1) RU2289875C2 (fr)
WO (1) WO2002060025A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2226354B1 (fr) * 2001-10-05 2012-12-12 Bridgestone Corporation Composition de caoutchouc
DE10255187A1 (de) * 2002-11-27 2004-06-24 Robert Bosch Gmbh Verfahren zum Verbinden einer Elektrode mit einem Edelmetallabschnitt
DE10352792A1 (de) * 2003-11-12 2005-06-23 Beru Ag Zündkerze und Verfahren zu ihrer Herstellung
US7851984B2 (en) * 2006-08-08 2010-12-14 Federal-Mogul World Wide, Inc. Ignition device having a reflowed firing tip and method of construction
AT506139B1 (de) * 2007-11-05 2010-08-15 Christian Francesconi Zündkerze mit edelmetallbeschichtung
KR101550089B1 (ko) 2009-03-31 2015-09-03 니혼도꾸슈도교 가부시키가이샤 스파크 플러그의 제조방법
JP4619443B2 (ja) 2009-03-31 2011-01-26 日本特殊陶業株式会社 スパークプラグ
JP4928596B2 (ja) 2009-12-04 2012-05-09 日本特殊陶業株式会社 スパークプラグ及びその製造方法
WO2012042801A1 (fr) 2010-09-29 2012-04-05 日本特殊陶業株式会社 Bougie d'allumage
JP5421212B2 (ja) * 2010-09-29 2014-02-19 日本特殊陶業株式会社 スパークプラグ
DE102011077279A1 (de) * 2011-06-09 2012-12-13 Robert Bosch Gmbh Elektrode für eine Zündkerze sowie Verfahren zu deren Herstellung
JP2015022791A (ja) * 2013-07-16 2015-02-02 日本特殊陶業株式会社 スパークプラグ及びその製造方法
DE102017214311A1 (de) * 2017-08-17 2019-02-21 Robert Bosch Gmbh Zündkerzenelektrode sowie Verfahren zur Herstellung dieser Zündkerzenelektrode und Zündkerze mit Zündkerzenelektrode
DE102019201185A1 (de) 2019-01-30 2020-07-30 Robert Bosch Gmbh Verfahren zur Herstellung einer Zündkerzenelektrode, Zündkerzenelektrode und Zündkerze
DE102022202816A1 (de) 2022-03-23 2023-09-28 Robert Bosch Gesellschaft mit beschränkter Haftung Zündkerzenelektrodenedelmetallpin, Zündkerzenelektroden, Zündkerze und Verfahren zur Herstellung der Zündkerzenelektroden

Family Cites Families (18)

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Publication number Priority date Publication date Assignee Title
DE3727526A1 (de) 1987-08-18 1989-03-02 Bosch Gmbh Robert Verfahren zum herstellen einer zuendkerze fuer brennkraftmaschinen
JPH07109783B2 (ja) 1989-05-29 1995-11-22 日本特殊陶業株式会社 内燃機関用スパークプラグ
JPH05234662A (ja) 1991-12-27 1993-09-10 Ngk Spark Plug Co Ltd スパークプラグ用電極およびその製造方法
JP2853108B2 (ja) 1992-06-17 1999-02-03 日本特殊陶業 株式会社 スパークプラグ
JP2853109B2 (ja) 1992-07-27 1999-02-03 日本特殊陶業株式会社 スパークプラグの製造方法
JP3425973B2 (ja) 1992-08-19 2003-07-14 日本特殊陶業株式会社 スパークプラグおよびその製造方法
JP3344737B2 (ja) 1992-09-10 2002-11-18 日本特殊陶業株式会社 スパークプラグの製造方法
JPH06188062A (ja) 1992-12-17 1994-07-08 Ngk Spark Plug Co Ltd スパークプラグ用電極
JP3315462B2 (ja) * 1993-04-26 2002-08-19 日本特殊陶業株式会社 スパークプラグ
JPH0737674A (ja) 1993-07-26 1995-02-07 Ngk Spark Plug Co Ltd スパークプラグ
JPH0773954A (ja) 1993-09-06 1995-03-17 Ngk Spark Plug Co Ltd スパークプラグ用中心電極
JPH07249471A (ja) * 1994-03-10 1995-09-26 Ngk Spark Plug Co Ltd スパークプラグ
JPH07296943A (ja) 1994-04-27 1995-11-10 Ngk Spark Plug Co Ltd 中心電極の製造方法
JPH0825069A (ja) * 1994-07-08 1996-01-30 Ngk Spark Plug Co Ltd レーザ溶接装置、溶接状態管理方法及びスパークプラグ用中心電極の製造方法
JP3196601B2 (ja) 1995-10-11 2001-08-06 株式会社デンソー 内燃機関用スパークプラグの製造方法
JPH09219274A (ja) * 1995-12-06 1997-08-19 Denso Corp スパークプラグ
US6078129A (en) * 1997-04-16 2000-06-20 Denso Corporation Spark plug having iridium containing noble metal chip attached via a molten bond
US6337533B1 (en) * 1998-06-05 2002-01-08 Denso Corporation Spark plug for internal combustion engine and method for manufacturing same

Also Published As

Publication number Publication date
DE10103045A1 (de) 2002-07-25
US20050176332A1 (en) 2005-08-11
BR0109425A (pt) 2002-12-10
US7192324B2 (en) 2007-03-20
WO2002060025A1 (fr) 2002-08-01
EP1356555B1 (fr) 2011-11-23
EP1356555A1 (fr) 2003-10-29
RU2289875C2 (ru) 2006-12-20
JP2004517459A (ja) 2004-06-10
RU2003124073A (ru) 2005-02-27
CN1419724A (zh) 2003-05-21
CN100409518C (zh) 2008-08-06
BR0109425B1 (pt) 2014-02-04

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