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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Prior art keywords
plate
extrusion
corrosion
spark plug
heat conducting
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Expired - Lifetime
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US00277101A
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T Yamaguchi
K Izumi
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Denso Corp
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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)

Abstract

A method for the production of a spark plug center electrode comprising the steps of preparing a plate for extrusion from a clad plate produced by bonding a corrosion-resistant metal plate and a good heat conducting metal plate together, and coldextruding the plate for extrusion to a rod form.

Description

United States Patent [1911 Yamaguchi et al.
METHOD OF PRODUCING SPARK PLUG CENTER ELECTRODE Inventors: Terumoto Yamaguchi, Anjo;
Kanemichi lzumi, Oobu, both of Japan Assignee: Nippondenso Co., Ltd., Kariya-shi,
Aichi-ken, Japan Filed: Aug. 1, 1972 Appl. No.: 277,101
Foreign Application Priority Data Apr. 18, 1972 Ja'pan.....' 17-39350 U.s. c1 72/258, 29/25.12 Int. Cl. B2lc 23/22 Field of Search 72/258; 29/25.l2, 25.14, 29/25.]7, 25.18; 313/141 [4 1 Apr. 16, 1974 [56] References Cited UNITED STATES PATENTS 3,144,576 8/1964 Hagmaier 72/253 2,955,222 10/l960 Beesch 313/141 Primary Examiner-Charles W. Lanham, Jr. Assistant Examiner-Robert M. Rogers Attorney, Agent, or Firm-Cushman, Darby &
Cushman [5 7] ABSTRACT -A method for the production of a spark plug center 2 Claims, 5 Drawing Figures METHOD OF PRODUCING SPARK PLUG CENTER ELECTRODE BACKGROUND OF THE INVENTION 2. Description of the Prior Art In a known method of producing a spark plug center electrode, 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.
SUMMARY OF THE INVENTION To solve the foregoing problems, it is an object of the I present invention to provide a method. for the producrod form by the process of cold-extrusion, whereby the I method is well suited for mass production and the production process is also stabilized.
Since 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.
BRIEF DESCRIPTION OF THE DRAWING 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.
DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention will now be explained with reference to an embodiment illustrated in the drawings. 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. In the first step of the method of the embodiment, 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.
If necessary, the corners of the hexagonal or square columnar plate for extrusion 4 may be removed.
In the second step, 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.
as compared with a cylindrical extrusion plate, and
moreover by cutting out the hexagonal or square columnar extrusion plate material 4 from the clad plate 3, the loss in the material can be reduced considerably as compared with the cylindrical extrusion plate material 4. Following the extrusion, if necessary, 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. I
We claim:
l. 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.
2. 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.
and a good heat conducting metal plate together, cut-

Claims (2)

1. 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 material in a square columnar shape out of said clad plate, and cold-extruding said extrusion plate material to a rod form.
2. 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 an 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 material in a hexagonal columnar shape out of said clad plate, and cold-extruding said extrusion plate material to a rod form.
US00277101A 1972-04-18 1972-08-01 Method of producing spark plug center electrode Expired - Lifetime US3803892A (en)

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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 (en) * 1978-12-16 1980-07-03 Gkn Floform Ltd METHOD FOR PRODUCING A SPARK PLUG ELECTRODE
US4288024A (en) * 1977-10-25 1981-09-08 The Nippert Company Method for making a bimetal resistance welding electrode
DE3017106A1 (en) * 1980-05-03 1981-11-05 Aluminium-Walzwerke Singen Gmbh, 7700 Singen METHOD FOR PRODUCING SOLIDLY FORMED LIGHT METAL ITEMS AND MOLDED BODY WITH A LIGHT METAL PART
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 (en) * 1986-11-24 1988-06-15 Allied Corporation Method for manufacturing a center electrode for a spark plug
FR2709384A1 (en) * 1993-08-27 1995-03-03 Bosch Gmbh Robert Electrode in the form of composite parts obtained by 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 (en) * 1993-08-27 2006-12-21 Robert Bosch Gmbh Process for producing a flow-molded, formed as a composite electrode
WO2007051677A1 (en) * 2005-11-03 2007-05-10 Robert Bosch Gmbh Spark plug electrode and method for producing a spark plug electrode
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 (en) * 2004-11-29 2017-05-18 Denso Corporation Compact structure of a spark plug designed to ensure a desired heat range

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 (en) * 1978-12-16 1980-07-11 Gkn Floform Ltd PROCESS FOR THE MANUFACTURE OF THE CENTRAL ELECTRODE OF A SPARK PLUG
US4314392A (en) * 1978-12-16 1982-02-09 Gkn Floform Limited Method of making a spark plug electrode
DE2950054A1 (en) * 1978-12-16 1980-07-03 Gkn Floform Ltd METHOD FOR PRODUCING A SPARK PLUG ELECTRODE
US4384234A (en) * 1979-12-07 1983-05-17 Texas Instruments Incorporated Spark plug with heat conducting sleeve for center electrode
DE3017106A1 (en) * 1980-05-03 1981-11-05 Aluminium-Walzwerke Singen Gmbh, 7700 Singen METHOD FOR PRODUCING SOLIDLY FORMED LIGHT METAL ITEMS AND MOLDED BODY WITH A LIGHT METAL PART
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 (en) * 1986-11-24 1988-06-15 Allied Corporation Method for manufacturing a center electrode for a spark plug
FR2709384A1 (en) * 1993-08-27 1995-03-03 Bosch Gmbh Robert Electrode in the form of composite parts obtained by 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 (en) * 1993-08-27 2006-12-21 Robert Bosch Gmbh Process for producing a flow-molded, formed as a composite electrode
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 (en) * 2004-11-29 2017-05-18 Denso Corporation Compact structure of a spark plug designed to ensure a desired heat range
WO2007051677A1 (en) * 2005-11-03 2007-05-10 Robert Bosch Gmbh Spark plug electrode and method for producing a spark plug electrode
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

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