US3803892A - Method of producing spark plug center electrode - Google Patents

Method of producing spark plug center electrode Download PDF

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Publication number
US3803892A
US3803892A US00277101A US27710172A US3803892A US 3803892 A US3803892 A US 3803892A US 00277101 A US00277101 A US 00277101A US 27710172 A US27710172 A US 27710172A US 3803892 A US3803892 A US 3803892A
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United States
Prior art keywords
plate
extrusion
corrosion
spark plug
heat conducting
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
US00277101A
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English (en)
Inventor
T Yamaguchi
K Izumi
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.)
Denso Corp
Original Assignee
NipponDenso Co Ltd
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Filing date
Publication date
Application filed by NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals

Definitions

  • a covering member is produced by boring a rod of corrosion-resistant metal such as nickel and then a rod-shaped core member consisting of a good heat conducting metal such as copper is inserted into and soldered to the covering member.
  • a disadvantage of this prior art method is that since the bore for receiving the core member of good heat conducting metal is formed in the covering member of corrosion-resistant metal by the process of cutting, there is a problem from mass production point of view. Moreover, it is difficult to ensure a positive bonding between .the core member and the covering member-with the resultant instability in the production-process.
  • the method according to the present invention comprises a first step of preparing a platefor extrusion from a clad plate composed of a corrosion-resistant metal plate and a good heat conducting metal plate bonded together, and a second step of cold-extruding the plate for extrusion to a rod form, there is no need to count upon the corrosion-resistant metal plate and the good heat conducting meta] platebeing bonded together during the cold exclusion operation, and more-. over there is no possibility that any foreign matters are 1 included between the covering member of corrosionresistant metal and the core member of good heatconducting metal and that air or the like is trapped between the two metals, thereby ensuring a very stable production process. Also since the platefor extrusion is prepared from the clad plate, the plate for extrusion a produced in a simple operation and moreover the core member can be covered with the covering member without requiring any cutting operation, thereby ensuring a higher mass production efficiency.
  • FIG. 1 is a side view of a clad plate employed in the method of producing a spark plug center electrode ac- '2
  • FIG. 4 is a fractional longitudinal sectional view of a cold extrusion die in which the plate of FIG. 2 or 3 may be inserted.
  • FIG. 5 is a longitudinal sectional view of a center electrode extruded by the cold extrusion die shown in FIG. 4.
  • FIG. 1 illustrates a clad plate 3 formed by bonding a plate 1 of corrosion-resistant metal such as nickel to a plate 2 of good heat conducting metal such as copper. While it is more economical to form the clad plate 3 by the process of cold or'hot pressure welding, the clad plate 3 may also be formed by such means as soldering or explosion pressure welding.
  • the clad plate 3 composed of the corrosion-resistant metal plate 1 and the good heat conducting metal plate 2 is cut out by a press or the like into hexagonal columns to produce plates for extrusion 4 as shown in FIG. 2 or alternatively the clad plate 3 is cut into long strips of the material so that each of the long strips is cut out into materials for extrusion 4 of square columnar shape as shown in FIG. 3.
  • the corners of the hexagonal or square columnar plate for extrusion 4 may be removed.
  • the plate for extrusion 4 prepared in the first step is inserted in an extrusiondie 5 of a cold extruding machine and pressure is then applied thereto by means of an extrusion punch 6 so that when a product is formed which comprises a cup-shaped covering member 7 consisting of the corrosion-resistant metal.
  • the loss in the material can be reduced considerably as compared with the cylindrical extrusion plate material 4.
  • the extruded product is subjected to a finishing operation such as sizing to produce a finished center electrode of any desired dimension which is then assembled into a spark plug.
  • a method of producing a spark plug center electrode comprising a core member consisting of a good heat conducting metal and a corrosion-resistant metal enclosing the sparking-side end and the side portions of the core member, the method comprising the steps of preparing the extrusion plate material from a clad plate formed by bonding a corrosion-resistant metal plate and a good heat conducting metal plate together, cutting said extrusion plate materialin a square columnar shape out of said clad plate, and cold-extruding said extrusion plate material to a rod form.
  • a method of producing a spark plug center elec trode comprising a core member consisting of a good heat conducting metal and a corrosion-resistant metal enclosing the sparking side end and the side portions of the core member, the method comprising the steps of ting said extrusion plate material in a hexagonal columpreparing an extrusion plate material from a clad plate nar shape out of said clad plate, and cold-extruding said formed by bonding a corrosion-resistant metal plate extrusion plate material to a rod form.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
US00277101A 1972-04-18 1972-08-01 Method of producing spark plug center electrode Expired - Lifetime US3803892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47039350A JPS49630A (de) 1972-04-18 1972-04-18

Publications (1)

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US3803892A true US3803892A (en) 1974-04-16

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Family Applications (1)

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US00277101A Expired - Lifetime US3803892A (en) 1972-04-18 1972-08-01 Method of producing spark plug center electrode

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US (1) US3803892A (de)
JP (1) JPS49630A (de)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949466A (en) * 1974-05-28 1976-04-13 Arthur D. Little Inc. Process for forming an aluminum electrical conducting wire junction end piece
US4040162A (en) * 1973-09-17 1977-08-09 Aisin Seiki Kabushiki Kaisha Method of producing composite extruded aluminum products from aluminum swarf
US4071947A (en) * 1976-12-13 1978-02-07 The Nippert Company Bimetal resistance welding electrode and method for making
DE2950054A1 (de) * 1978-12-16 1980-07-03 Gkn Floform Ltd Verfahren zum herstellen einer zuendkerzenelektrode
US4288024A (en) * 1977-10-25 1981-09-08 The Nippert Company Method for making a bimetal resistance welding electrode
DE3017106A1 (de) * 1980-05-03 1981-11-05 Aluminium-Walzwerke Singen Gmbh, 7700 Singen Verfahren zum herstellen massiv umgeformter leichtmetallgegenstaende sowie formkoerper mit einem leichtmetallteil
US4345136A (en) * 1978-11-13 1982-08-17 The Nippert Company Copper bimetal brazed resistance welding electrode
US4384234A (en) * 1979-12-07 1983-05-17 Texas Instruments Incorporated Spark plug with heat conducting sleeve for center electrode
US4526551A (en) * 1980-05-30 1985-07-02 Champion Spark Plug Company Production of electrodes
US4684352A (en) * 1985-03-11 1987-08-04 Champion Spark Plug Company Method for producing a composite spark plug center electrode
EP0270746A1 (de) * 1986-11-24 1988-06-15 Allied Corporation Herstellungsverfahren einer Mittelelektrode für eine Zündkerze
FR2709384A1 (fr) * 1993-08-27 1995-03-03 Bosch Gmbh Robert Electrode sous forme de pièces composites obtenues par extrusion.
US5914057A (en) * 1997-02-04 1999-06-22 The Nippert Company Resistance welding electrode and process for making
US5973443A (en) * 1996-05-06 1999-10-26 Alliedsignal Inc. Spark plug electrode tip for internal combustion engine
WO2000003465A1 (en) * 1998-07-13 2000-01-20 Alliedsignal Inc. Spark plug electrode having iridium based sphere and method for manufacturing same
US6225591B1 (en) 1997-11-20 2001-05-01 The Nippert Company Resistance welding electrode and process for making
US20060103283A1 (en) * 2003-03-18 2006-05-18 Pertti Lintunen Spark plug and method for producing it
DE4424789B4 (de) * 1993-08-27 2006-12-21 Robert Bosch Gmbh Verfahren zur Herstellung einer fließgepreßten, als Verbundkörper ausgebildeten Elektrode
WO2007051677A1 (de) * 2005-11-03 2007-05-10 Robert Bosch Gmbh Zündkerzenelektrode und verfahren zum herstellen einer zündkerzenelektrode
US20070114900A1 (en) * 2005-11-18 2007-05-24 Lykowski James D Spark plug with multi-layer firing tip
US20070128463A1 (en) * 2005-11-09 2007-06-07 Gwendolyn Dixon multi-alloy monolithic extruded structural member and method of producing thereof
US8202628B2 (en) 2006-12-08 2012-06-19 Musashi Seimitsu Kogyo Kabushiki Kaisha Fusion-bonded product having high-strength part and manufacturing method thereof
DE102005056673B4 (de) * 2004-11-29 2017-05-18 Denso Corporation Kompaktstruktur einer Zündkerze, die entwickelt ist, um einen gewünschten Hitzebereich sicherzustellen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955222A (en) * 1958-06-25 1960-10-04 Bosch Gmbh Robert Center electrode structure for spark plugs and process for making the same
US3144576A (en) * 1962-02-14 1964-08-11 Hagmaier Eugen Spark plug and method of manufacture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955222A (en) * 1958-06-25 1960-10-04 Bosch Gmbh Robert Center electrode structure for spark plugs and process for making the same
US3144576A (en) * 1962-02-14 1964-08-11 Hagmaier Eugen Spark plug and method of manufacture

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040162A (en) * 1973-09-17 1977-08-09 Aisin Seiki Kabushiki Kaisha Method of producing composite extruded aluminum products from aluminum swarf
US3949466A (en) * 1974-05-28 1976-04-13 Arthur D. Little Inc. Process for forming an aluminum electrical conducting wire junction end piece
US4071947A (en) * 1976-12-13 1978-02-07 The Nippert Company Bimetal resistance welding electrode and method for making
US4288024A (en) * 1977-10-25 1981-09-08 The Nippert Company Method for making a bimetal resistance welding electrode
US4345136A (en) * 1978-11-13 1982-08-17 The Nippert Company Copper bimetal brazed resistance welding electrode
FR2444353A1 (fr) * 1978-12-16 1980-07-11 Gkn Floform Ltd Procede pour la fabrication de l'electrode centrale d'une bougie d'allumage
US4314392A (en) * 1978-12-16 1982-02-09 Gkn Floform Limited Method of making a spark plug electrode
DE2950054A1 (de) * 1978-12-16 1980-07-03 Gkn Floform Ltd Verfahren zum herstellen einer zuendkerzenelektrode
US4384234A (en) * 1979-12-07 1983-05-17 Texas Instruments Incorporated Spark plug with heat conducting sleeve for center electrode
DE3017106A1 (de) * 1980-05-03 1981-11-05 Aluminium-Walzwerke Singen Gmbh, 7700 Singen Verfahren zum herstellen massiv umgeformter leichtmetallgegenstaende sowie formkoerper mit einem leichtmetallteil
US4526551A (en) * 1980-05-30 1985-07-02 Champion Spark Plug Company Production of electrodes
US4684352A (en) * 1985-03-11 1987-08-04 Champion Spark Plug Company Method for producing a composite spark plug center electrode
EP0270746A1 (de) * 1986-11-24 1988-06-15 Allied Corporation Herstellungsverfahren einer Mittelelektrode für eine Zündkerze
FR2709384A1 (fr) * 1993-08-27 1995-03-03 Bosch Gmbh Robert Electrode sous forme de pièces composites obtenues par extrusion.
US5551902A (en) * 1993-08-27 1996-09-03 Robert Bosch Gmbh Extrusion molded electrode formed as compound body and a method of producing the same
DE4424789B4 (de) * 1993-08-27 2006-12-21 Robert Bosch Gmbh Verfahren zur Herstellung einer fließgepreßten, als Verbundkörper ausgebildeten Elektrode
US5973443A (en) * 1996-05-06 1999-10-26 Alliedsignal Inc. Spark plug electrode tip for internal combustion engine
US5914057A (en) * 1997-02-04 1999-06-22 The Nippert Company Resistance welding electrode and process for making
USRE40265E1 (en) * 1997-02-04 2008-04-29 Luvata Ohio, Inc. Resistance welding electrode and process for making
US6225591B1 (en) 1997-11-20 2001-05-01 The Nippert Company Resistance welding electrode and process for making
WO2000003465A1 (en) * 1998-07-13 2000-01-20 Alliedsignal Inc. Spark plug electrode having iridium based sphere and method for manufacturing same
US20060103283A1 (en) * 2003-03-18 2006-05-18 Pertti Lintunen Spark plug and method for producing it
DE102005056673B4 (de) * 2004-11-29 2017-05-18 Denso Corporation Kompaktstruktur einer Zündkerze, die entwickelt ist, um einen gewünschten Hitzebereich sicherzustellen
WO2007051677A1 (de) * 2005-11-03 2007-05-10 Robert Bosch Gmbh Zündkerzenelektrode und verfahren zum herstellen einer zündkerzenelektrode
WO2007070731A1 (en) * 2005-11-09 2007-06-21 Alcoa Inc. A multi-alloy monolithic extruded structural member and method of producing thereof
US20070128463A1 (en) * 2005-11-09 2007-06-07 Gwendolyn Dixon multi-alloy monolithic extruded structural member and method of producing thereof
US20070130751A1 (en) * 2005-11-18 2007-06-14 Lykowski James D Method of forming a spark plug with multi-layer firing tip
US7521850B2 (en) 2005-11-18 2009-04-21 Federal Mogul World Wide, Inc. Spark plug with multi-layer firing tip
US20090179544A1 (en) * 2005-11-18 2009-07-16 Lykowski James D Spark Plug With Multi-Layer Firing Tip
US7581304B2 (en) * 2005-11-18 2009-09-01 Federal-Mogul World Wide, Inc. Method of forming a spark plug with multi-layer firing tip
US7671521B2 (en) 2005-11-18 2010-03-02 Federal Mogul World Wide, Inc. Spark plug with multi-layer firing tip
US7948159B2 (en) 2005-11-18 2011-05-24 Federal Mogul World Wide, Inc. Spark plug with multi-layer firing tip
US20070114900A1 (en) * 2005-11-18 2007-05-24 Lykowski James D Spark plug with multi-layer firing tip
US8202628B2 (en) 2006-12-08 2012-06-19 Musashi Seimitsu Kogyo Kabushiki Kaisha Fusion-bonded product having high-strength part and manufacturing method thereof

Also Published As

Publication number Publication date
JPS49630A (de) 1974-01-07

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