EP0044764A1 - Méthode de fabrication d'une électrode centrale pour utilisation dans une bougie d'allumage - Google Patents

Méthode de fabrication d'une électrode centrale pour utilisation dans une bougie d'allumage Download PDF

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Publication number
EP0044764A1
EP0044764A1 EP81401072A EP81401072A EP0044764A1 EP 0044764 A1 EP0044764 A1 EP 0044764A1 EP 81401072 A EP81401072 A EP 81401072A EP 81401072 A EP81401072 A EP 81401072A EP 0044764 A1 EP0044764 A1 EP 0044764A1
Authority
EP
European Patent Office
Prior art keywords
wire
die
cup
inconel
corrosion 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Withdrawn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
EP81401072A
Other languages
German (de)
English (en)
Inventor
William Alvie Barrett
William Locke Atwell
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.)
Bendix Corp
Original Assignee
Bendix Autolite Corp
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 Bendix Autolite Corp filed Critical Bendix Autolite Corp
Publication of EP0044764A1 publication Critical patent/EP0044764A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
    • 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
    • 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 relates to a method of making the center electrodes for a spark plug.
  • Spark plugs are used in internal combustion engines to ignite the fuel in the combustion chamber: Hence, the electrodes .of a spark plug are subject to. intense heat and an extremely corrosive atmosphere. To provide some degree of longevity for the spark plug, the center electrode is made from a good heat conducting material such as copper surrounded by a jacket of a corrosion resistant material such as nickel.
  • Patent 3,548,472 issued December 22, 1970 and entitled “Ignition Plug and Method for Manufacturing a Center Electrode for the Same” illustrates a method of cold forming an outer nickel cup shaped sleeve by several steps and then inserting a piece of copper wire into the cup and then lightly pressing the two materials together.
  • the invention proposes :
  • the invention is a method for manufacturing an inconel and copper electrode for use in a spark plug.
  • the method is characterized by the steps of lubricating an inconel wire beforeit is formed into a cup-shaped member in two steps, inserting a piece of copper wire into the inconel cup and into a die, and:then striking the mated pieces with a punch to form an electrodeTwith the copper exposed at only one end of the inconel.
  • the method is further characterized by the use of a bolt making machine which appliesthe necessary force behind the punch striking the metal in the die.
  • An advantage of this invention is that it provides a process that permits the cold working of inconel.
  • Another advantage of the invention is that it provides a simple method of forming inconel into a cup shaped member.
  • Another advantage of this invention is that a large number of center electrodes can be produced with a minimum number of manufacturing steps.
  • Another advantage of this invention is the method provides a spark plug electrode having good heat conductivity and increased corrosion resistance which increases the useful life and effectiveness of the spark plug.
  • Another advantage of this invention is that the lubricant prevents bonding of the punch to the inconel wire during the process of shaping the inconel wire into a cup-shaped member.
  • FIGURE 1 illustrates a piece of corrosion resistant metal wire having a diameter of about 0,360 cm.
  • a preferred corrosion resistant alloy is inconel which is an iron alloy containing Nickle and Chromium.
  • One such inconel metal known as Hoskins Alloy 831, contains 75 % Nickle, 15 % Chromium and 7 % Iron.
  • a standard cold heading lubricant is a lubricating oil with extreme pressure additives : sulphur, chlorine and neutral animal fat. It is most often a combination of sulphrized fat and a chlorine additive and is available from a good number of lubricant manufacturers.
  • Lubrication is vital in cold heading to reduce die wear, promote good finishes and eliminate galling, scratching and seizing of the work piece by preventing pickups by the dye.
  • the sulphur and chlorine components of the lubricant form ferrous sulphides and chlorides which prevent welding of the die to the workpiece and act in the same way as a solid lubricant.
  • An example of one such lubricating oil is TUF-DRAW I.F. 2885 made by Franklin Oil Corporation of Ohio.
  • FIGURE 2 illustrates the die 10 and punch 30 which forms the inconel wire 2 into a predetermined shape.
  • the die 10 is mounted in a housing 20 which also includes a spring 21 actuated knockout pin 40 for removing the incmel wire 2 after the punch 30 has struck the wire and withdraws from the die 10.
  • FIGURE 3 illustrates the shape to the inconel wire 2 after removal from the die.
  • the inconel 2 is formed so that there is a recess 22 at one end. and a tapered portion 23 at the opposite end. This shape helps to facilitate forming the inconel into a cup-shaped member in the next step shown in FIGURE 4.
  • FIGURE 4 illustrates the die 11 and punch 31 which forms the elongated cup-shaped inconel member 3 having a 0,264 cm diameter hole about 0,577 cm deep.
  • the die and punch are located in a bolt making machine.
  • One such bolt making machine suitable for driving the punch and mountiigthe die is a National Machinery 1/4 inch boltmaker which operates at about 85 strokes per minute and will apply a pressure from the punch to the workpieces greater than 15,000 Kg/cm2. Because of the high pressure between a workpiece, a die and a punch, it is important that the die and punch be comprised of a material such as carbide.
  • FIGURE 5 illustrates a piece of copper wire 9 inserted into the elongated cup-shaped member 3.
  • the wire 9 is inserted into the inconel cup 3 there is a void 8 between the copper and inconel wire. It is preferred that this void be eliminated to increase the efficiency of thermal conductivity between the copper wire 9 and inconel cup 3.
  • FIGURE 6 illustrates a punch 32 and die 12 for securing together (coining) the copper wire 9 to the inconel cup 3. This step minimizes any void between the copper wire 9 and inconel cup 3.
  • FIGURE 7 illustrates the copper wire 9 coined to the inconel cup 3.
  • FIGURE 8 illustrates the punch 33 and dies 13 and 14 used in the final step in the process that forms the completed electrode.
  • FIGURE 9 illustrates the completed copper cored .9' inconel sheathed 3' electrode having an overal length of about 1.62 cm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Spark Plugs (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP81401072A 1980-07-17 1981-07-03 Méthode de fabrication d'une électrode centrale pour utilisation dans une bougie d'allumage Withdrawn EP0044764A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16970880A 1980-07-17 1980-07-17
US169708 1980-07-17

Publications (1)

Publication Number Publication Date
EP0044764A1 true EP0044764A1 (fr) 1982-01-27

Family

ID=22616851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81401072A Withdrawn EP0044764A1 (fr) 1980-07-17 1981-07-03 Méthode de fabrication d'une électrode centrale pour utilisation dans une bougie d'allumage

Country Status (2)

Country Link
EP (1) EP0044764A1 (fr)
JP (1) JPS5753086A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585421A (en) * 1983-11-23 1986-04-29 The National Machinery Company Method of making copper-clad bimetal electrodes for spark plugs
US4606730A (en) * 1983-09-21 1986-08-19 The National Machinery Company Bimetal electrodes for spark plugs or the like and method of making same
EP3322050A1 (fr) * 2016-11-11 2018-05-16 NGK Spark Plug Co., Ltd. Appareil de traitement, procédé de fabrication de produit moulé et procédé de fabrication d'électrode de bougie d'allumage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0992441A (ja) * 1995-09-22 1997-04-04 Ngk Spark Plug Co Ltd スパークプラグ用側方電極の製造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB558405A (en) * 1942-02-09 1944-01-04 Gen Motors Corp Improved method of making spark plugs
US3857145A (en) * 1972-04-14 1974-12-31 Nippon Denso Co Method of producing spark plug center electrode
GB1459641A (en) * 1973-03-12 1976-12-22 Caterpillar Tractor Co Cold-formed hydraulic cylinder and method of making
DE2638949A1 (de) * 1976-08-28 1978-03-02 Bosch Gmbh Robert Verfahren zum anformen von zapfen an einer platine
FR2412186A1 (fr) * 1977-12-19 1979-07-13 Atomic Energy Authority Uk Procede de realisation d'une electrode de bougie d'allumage
GB2024665A (en) * 1978-07-07 1980-01-16 Ford Motor Co Spark plug electrode manufacture
GB2037190A (en) * 1978-12-16 1980-07-09 Gkn Floform Ltd Manufacture of spark plug electrode
FR2467497A1 (fr) * 1979-10-15 1981-04-17 Champion Spark Plug Co Procede de production d'electrode composite de bougie d'allumage

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB558405A (en) * 1942-02-09 1944-01-04 Gen Motors Corp Improved method of making spark plugs
US3857145A (en) * 1972-04-14 1974-12-31 Nippon Denso Co Method of producing spark plug center electrode
GB1459641A (en) * 1973-03-12 1976-12-22 Caterpillar Tractor Co Cold-formed hydraulic cylinder and method of making
DE2638949A1 (de) * 1976-08-28 1978-03-02 Bosch Gmbh Robert Verfahren zum anformen von zapfen an einer platine
FR2412186A1 (fr) * 1977-12-19 1979-07-13 Atomic Energy Authority Uk Procede de realisation d'une electrode de bougie d'allumage
GB2024665A (en) * 1978-07-07 1980-01-16 Ford Motor Co Spark plug electrode manufacture
GB2037190A (en) * 1978-12-16 1980-07-09 Gkn Floform Ltd Manufacture of spark plug electrode
FR2467497A1 (fr) * 1979-10-15 1981-04-17 Champion Spark Plug Co Procede de production d'electrode composite de bougie d'allumage
DE3036226A1 (de) * 1979-10-15 1981-04-23 Champion Spark Plug Co., Toledo, Ohio Verfahren zum herstellen einer zuendkerzenelektrode aus verbundmaterial
GB2060454A (en) * 1979-10-15 1981-05-07 Champion Spark Plug Co Production of Spark Plug Electrodes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4606730A (en) * 1983-09-21 1986-08-19 The National Machinery Company Bimetal electrodes for spark plugs or the like and method of making same
US4585421A (en) * 1983-11-23 1986-04-29 The National Machinery Company Method of making copper-clad bimetal electrodes for spark plugs
EP3322050A1 (fr) * 2016-11-11 2018-05-16 NGK Spark Plug Co., Ltd. Appareil de traitement, procédé de fabrication de produit moulé et procédé de fabrication d'électrode de bougie d'allumage
CN108075359A (zh) * 2016-11-11 2018-05-25 日本特殊陶业株式会社 加工装置、成形体的制造方法及火花塞用电极的制造方法
US10847952B2 (en) 2016-11-11 2020-11-24 Ngk Spark Plug Co., Ltd. Processing apparatus, method for manufacturing molded product, and method for manufacturing spark plug electrode

Also Published As

Publication number Publication date
JPS5753086A (en) 1982-03-29

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19810708

AK Designated contracting states

Designated state(s): DE FR GB IT

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19831021

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BARRETT, WILLIAM ALVIE

Inventor name: ATWELL, WILLIAM LOCKE