WO2010087076A1 - スパークプラグ及びその製造方法 - Google Patents
スパークプラグ及びその製造方法 Download PDFInfo
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- WO2010087076A1 WO2010087076A1 PCT/JP2009/070723 JP2009070723W WO2010087076A1 WO 2010087076 A1 WO2010087076 A1 WO 2010087076A1 JP 2009070723 W JP2009070723 W JP 2009070723W WO 2010087076 A1 WO2010087076 A1 WO 2010087076A1
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- Prior art keywords
- ground electrode
- layer
- tip
- electrode
- plating
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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
- H01T13/32—Sparking plugs characterised by features of the electrodes or insulation characterised by features of the earthed electrode
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/02—Electroplating of selected surface areas
- C25D5/024—Electroplating of selected surface areas using locally applied electromagnetic radiation, e.g. lasers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
- C25D5/50—After-treatment of electroplated surfaces by heat-treatment
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
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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 present invention relates to a spark plug used for an internal combustion engine or the like, and a manufacturing method thereof.
- a spark plug used for an internal combustion engine such as an automobile engine includes, for example, a central electrode extending in the axial direction, an insulator provided outside the center electrode, a cylindrical metal shell provided outside the insulator, and a base end And a ground electrode joined to the tip of the metal shell.
- the ground electrode is bent and disposed so that the tip thereof faces the center electrode, and a spark discharge gap is formed between the center electrode and the ground electrode.
- the metal shell is generally made of an iron-based material such as low carbon steel, a nickel plating layer is formed on the surface thereof in order to improve the corrosion resistance.
- a nickel plating layer is formed on the surface thereof in order to improve the corrosion resistance.
- the ground electrode is joined to the metal shell, but generally both are joined by resistance welding. Therefore, if a plating layer is formed on the surface of the metal shell, it becomes difficult to join the ground electrode to the metal shell. Moreover, even if both can be joined, since the plating layer is damaged at the welded portion, there is a possibility that the corrosion resistance is lowered. Therefore, it is a common practice to perform a plating process on both the metal shell and the ground electrode after previously bonding the ground electrode to the metal shell. In this case, a plating film is formed over the entire surface of the metal shell and the ground electrode.
- the plating film may be peeled off due to the bending.
- spark discharge so-called side fire
- a method of removing (peeling) a plating film located in a predetermined range (for example, a portion to be bent) among the plating films formed on the entire surface of the ground electrode can be considered.
- a method for removing the plating film a method in which the metal shell is held by a predetermined jig and the predetermined range of each ground electrode is immersed in an acidic stripping solution (for example, a patent) Reference 1 etc.).
- the present invention has been made in view of the above circumstances, and an object thereof is to remove the plating film provided on the ground electrode relatively easily without incurring an increase in cost, and to achieve ignitability. It is an object of the present invention to provide a spark plug capable of preventing a decrease and a manufacturing method thereof.
- the spark plug of this configuration includes a rod-shaped center electrode extending in the axial direction, A cylindrical insulator having an axial hole extending in the axial direction and the central electrode provided in the axial hole; A cylindrical metal shell provided on the outer periphery of the insulator; It consists of an alloy mainly composed of nickel that extends from the tip of the metal shell and is bent at a substantially middle portion thereof and forms a spark discharge gap between the tip of the metal shell and the tip of the center electrode.
- a spark plug comprising a ground electrode, By irradiating a laser beam or an electron beam to the plating film mainly composed of nickel formed on the central electrode side portion of at least the planned bending portion of the ground electrode, A melted layer in which a metal component constituting the plating film and a metal component constituting the ground electrode are melted is formed at a portion on the center electrode side, and the laser beam or the electron beam among the ground electrodes is formed.
- a plating layer mainly composed of nickel is formed in a portion other than the portion irradiated with.
- tip which consists of noble metal alloys in the front-end
- the spark discharge gap is formed between the noble metal tip and the ground electrode.
- At least one of the planned bending portions of the ground electrode is planned to be bent by irradiating a plating film mainly composed of nickel formed on the central electrode side portion with a laser beam or an electron beam.
- a molten layer in which the metal component (Ni alloy) that constitutes the ground electrode and the metal component that constitutes the plating film are melted is formed at the site on the center electrode side of the site. That is, the plating film having a relatively low adhesion to the ground electrode is removed by irradiation with laser light or the like, and a molten layer is formed on the surface of the ground electrode.
- this molten layer is formed by melting Ni alloy constituting the ground electrode, Ni constituting the plating film, or the like, it is relatively excellent in adhesion to the ground electrode. Therefore, even when the ground electrode is bent, the plating film at the bent portion is removed, so that a situation such as peeling of the plating film cannot occur, and peeling of the molten layer having excellent adhesion is hardly caused. Does not occur. Therefore, abnormal spark discharge between the center electrode and the ground electrode can be suppressed, and a reduction in ignitability can be more reliably prevented.
- a laser beam or an electron beam is irradiated when removing the plating. Therefore, as compared with the conventional technique in which the tip of the ground electrode is immersed in an acidic stripping solution or the ground electrode is masked and a plating layer is provided, the cost can be significantly reduced. In addition, the workability can be dramatically improved.
- the spark plug of this configuration is the above-described configuration 1, wherein the portion of the tip portion of the ground electrode that forms the spark discharge gap with the center electrode is mainly composed of nickel formed in the portion.
- a molten layer in which the metal component constituting the plating film and the metal component constituting the ground electrode are melted is formed, and the molten layer A noble metal tip is bonded to the substrate.
- a noble metal tip made of a noble metal alloy can be joined to the ground electrode.
- a plating film is formed on a portion of the ground electrode where the noble metal tip is to be joined (part to be joined)
- the present configuration 2 by irradiating the plating film formed at the site where the noble metal tip is to be bonded in the ground electrode with a laser beam or an electron beam, the surface of the site to be bonded is melted. Is formed. Therefore, since the noble metal tip is joined to the ground electrode through the molten layer having excellent adhesion to the ground electrode, the noble metal tip can be firmly joined. In other words, strong bonding of the noble metal tip to the ground electrode by resistance welding can be realized by using a relatively simple method such as irradiation with a laser beam or an electron beam.
- the molten layer formed by irradiating the laser beam or the electron beam has fine irregularities on the surface. This is because the noble metal tip is provided on the ground electrode as in the present configuration 2. It works significantly in some cases. In other words, since the surface of the molten layer formed by irradiation with laser light or the like is uneven, when the noble metal tip is joined to the ground electrode, the contact area between the molten layer and the noble metal tip during resistance welding is reduced. As a result, the contact resistance between the two can be increased. Therefore, the noble metal tip can be bonded with sufficient strength even if the pressure applied when the noble metal tip is pressed against the ground electrode side or the applied current is relatively small.
- the spark plug of this configuration is the above configuration 1 or 2, wherein the ground electrode is made of an alloy containing nickel as a main component and chromium.
- the plating layer is characterized by containing nickel as a main component and chromium by 3 mass% or more and 30 mass% or less.
- the ground electrode can contain chromium (Cr).
- Cr chromium
- Cr in the ground electrode tends to diffuse (move) toward the plating layer side containing Ni as a main component at high temperatures.
- Ni grows with the diffusion of Cr, and the effect of improving the oxidation resistance may not be sufficiently exhibited.
- the plating layer contains 3 mass% or more and 30 mass% or less of Cr, it is possible to effectively diffuse Cr in the ground electrode to the plating layer side at a high temperature. Can be suppressed. As a result, the grain growth of Ni can be suppressed, and the effect of improving oxidation resistance can be sufficiently exhibited.
- the Cr content of the plating layer is less than 3% by mass, the diffusion of Cr in the ground electrode may not be sufficiently suppressed.
- the Cr content of the plating layer exceeds 30% by mass, the adhesion of the plating layer to the ground electrode is impaired, and the plating layer (plating film) is easily peeled off. If the plating layer is peeled off, an abnormal spark discharge (such as a horizontal spark) is likely to occur between the peeled plating layer and the center electrode, and the ignitability may be reduced.
- the spark plug of this configuration includes a rod-shaped center electrode extending in the axial direction, A cylindrical insulator having an axial hole extending in the axial direction and the central electrode provided in the axial hole; A cylindrical metal shell provided on the outer periphery of the insulator; And extending from the front end of the metal shell, a substantially intermediate portion of itself is bent, and the front end of the main metal includes a ground electrode that forms a spark discharge gap with the front end of the center electrode,
- the ground electrode is a spark plug made of an alloy containing nickel as a main component and chromium.
- Laser light is applied to a multi-layer coating consisting of a nickel-based plating film formed on at least the center electrode side of the ground electrode to be bent and a chromate film positioned on the plating film. Or, by irradiating with an electron beam, a molten layer in which the metal component constituting the multilayer coating and the metal component constituting the ground electrode are melted is formed at the central electrode side portion of the planned bending portion.
- a plating layer mainly composed of nickel and a chromate film located on the plating layer are formed. It is characterized by that.
- the plated layer mainly composed of Ni and the chromate film positioned on the plated layer are formed in the ground electrode other than the portion irradiated with the laser beam or the like. Therefore, in use, the surface temperature is more likely to rise than the inside of the ground electrode, and the Cr in the chromate film located on the surface side of the ground electrode mainly contains Ni prior to the Cr in the ground electrode. It diffuses to the plating layer side as a component. As a result, the diffusion of Cr in the ground electrode to the plating layer side can be more reliably suppressed, and the oxidation resistance can be sufficiently improved.
- the configurations 3 and 4 are particularly effective for a ground electrode having a large Cr content, and it is more desirable to apply to a ground electrode having a Cr content of 10% by mass or more. It is even more desirable to apply to a ground electrode having a mass of 20% by mass or more.
- the spark plug of the present configuration is the above-described configuration 4, in which the spark discharge gap between the tip portion of the ground electrode and the center electrode is mainly composed of nickel formed in the portion.
- the metal component constituting the multilayer film and the ground electrode are configured.
- a molten layer in which a metal component to be melted is formed, and a noble metal tip is bonded to the molten layer.
- the spark plug of this configuration is the ground electrode from the surface of a portion of the plating layer closest to the molten layer to the portion of the molten layer opposite to the surface in the configurations 1 to 5 described above.
- the maximum length along the thickness direction is 200 ⁇ m or less.
- the maximum length along the thickness direction of the ground electrode from the surface of the portion of the plated layer closest to the molten layer to the portion of the molten layer opposite to the surface of the plated layer. (Hereinafter referred to as “apparent melt layer thickness”) is 200 ⁇ m or less and relatively thin. Therefore, it can prevent more reliably that the adhesiveness of the molten layer with respect to a ground electrode will be impaired. Further, in the case where the noble metal tip is provided on the ground electrode side, if the apparent melt layer thickness is 200 ⁇ m or less, the noble metal tip is more reliably bonded not only to the melt layer but also to the ground electrode. As a result, the noble metal tip can be bonded with a further excellent bonding strength, and peeling of the noble metal tip can be effectively suppressed.
- a manufacturing method of the spark plug of this configuration includes a rod-shaped center electrode extending in the axial direction, A cylindrical insulator having an axial hole extending in the axial direction and the central electrode provided in the axial hole; A cylindrical metal shell provided on the outer periphery of the insulator; It consists of a nickel-based alloy that extends from the tip of the metal shell and is bent at a substantially middle portion thereof, and forms a spark discharge gap between the tip of the metal shell and the tip of the center electrode.
- a ground electrode, A method for producing a spark plug comprising a plating layer mainly composed of nickel on a part of a surface of the ground electrode and the metal shell, A plating film forming step of forming a plating film to be the plating layer over substantially the entire surface of the metal shell and the ground electrode by performing nickel plating on the metal shell provided with the ground electrode; A metal component that constitutes the plating film and a metal component that constitutes the ground electrode by irradiating a laser beam or an electron beam to at least a portion on the center electrode side of the planned bending portion of the ground electrode A molten layer forming step of forming a molten layer in which A process of bending the ground electrode to be bent, and forming a spark discharge gap between the tip of the ground electrode and the tip of the center electrode; In the molten layer forming step, along the thickness direction of the ground electrode from the surface of the plating layer closest to the molten layer to the portion of the molten layer opposite to the surface The laser beam or the electron beam is
- the thickness of the ground electrode from the surface of the portion of the plated layer closest to the molten layer to the portion of the molten layer opposite to the surface of the plated layer is formed by melting the metal component constituting the plating film and the metal component (Ni alloy) constituting the ground electrode, and the same effect as in the above-described configuration 1 is achieved.
- the spark plug manufacturing method of the present configuration is the spark plug manufacturing method according to the above-described configuration 7, wherein a noble metal tip that forms the spark discharge gap with the center electrode is provided at the tip of the ground electrode.
- the laser beam or the electron beam is irradiated on the planned bonding position of the noble metal tip in the ground electrode, and then the noble metal is applied to the molten layer formed at the planned bonding position. It is characterized by joining chips.
- the spark plug manufacturing method of the present configuration is the above-described configuration 7 or 8, wherein, in the molten layer forming step, from the surface of the plated layer closest to the molten layer to the surface of the molten layer, Is irradiated with the laser beam or the electron beam so that the maximum length along the thickness direction of the ground electrode to the opposite side portion is 200 ⁇ m or less.
- the spark plug manufacturing method according to the present configuration is any one of the above-described configurations 7 to 9, wherein, in the molten layer forming step, the laser beam or the electron beam is irradiated in an atmosphere having an oxygen partial pressure of 10 3 Pa or less. It is characterized by doing.
- the laser beam or the electron beam is irradiated in an atmosphere having an oxygen partial pressure of 10 3 Pa or less. Therefore, oxidation of the formed molten layer can be effectively prevented, and durability can be improved.
- a laser beam or the like is irradiated in a vacuum, or the processing surface is assisted by nitrogen, helium, argon gas or the like.
- a method of irradiating a laser beam or the like while blowing a gas can be given.
- FIG. 1 It is a partially broken front view which shows the structure of a spark plug. It is a partially broken front view which shows the structure of the front-end
- (A)-(c) is an enlarged schematic diagram for demonstrating the formation method of the molten layer in the front-end
- (d) is the partial expanded cross section which shows the joining state of the noble metal chip
- (A)-(c) is the elements on larger scale for demonstrating the structure of the front-end
- (A), (b) is the elements on larger scale for showing the ground electrode etc. in another embodiment. It is a partial expanded sectional view which shows the structure of the chromate film etc. in 2nd Embodiment. It is a partial expanded sectional view which shows the structure of Ni plating layer etc. in 3rd Embodiment.
- FIG. 1 is a partially cutaway front view showing a spark plug 1.
- the direction of the axis CL ⁇ b> 1 of the spark plug 1 is the vertical direction in the drawing, the lower side is the front end side of the spark plug 1 and the upper side is the rear end side.
- the spark plug 1 includes an insulator 2 as a cylindrical insulator, a cylindrical metal shell 3 that holds the insulator 2, and the like.
- the insulator 2 is formed by firing alumina or the like, and in its outer portion, a rear end side body portion 10 formed on the rear end side, and a front end than the rear end side body portion 10.
- a large-diameter portion 11 that protrudes outward in the radial direction on the side, and a middle body portion 12 that has a smaller diameter on the tip side than the large-diameter portion 11 are provided.
- the insulator 2 is provided with a leg length portion 13 formed on the distal end side with respect to the middle trunk portion 12 and having a diameter smaller than that of the middle trunk portion 12.
- a tapered step portion 14 is formed at the connecting portion between the leg length portion 13 and the middle trunk portion 12, and the insulator 2 is locked to the metal shell 3 at the step portion 14.
- a shaft hole 4 is formed through the insulator 2 along the axis CL1, and a center electrode 5 is inserted and fixed at the tip side of the shaft hole 4.
- the center electrode 5 has a rod-like shape (cylindrical shape) as a whole, and its tip end surface is formed flat and protrudes from the tip of the insulator 2.
- the center electrode 5 includes an inner layer 5A made of copper or a copper alloy and an outer layer 5B made of a Ni alloy containing nickel (Ni) as a main component.
- a columnar noble metal tip 31 made of a noble metal alloy (for example, an iridium alloy or a platinum alloy) is joined to the tip of the center electrode 5.
- a terminal electrode 6 is inserted and fixed on the rear end side of the shaft hole 4 in a state of protruding from the rear end of the insulator 2.
- a cylindrical resistor 7 is disposed between the center electrode 5 and the terminal electrode 6 of the shaft hole 4. Both ends of the resistor 7 are electrically connected to the center electrode 5 and the terminal electrode 6 through conductive glass seal layers 8 and 9, respectively.
- the metal shell 3 is formed in a cylindrical shape from a metal such as low carbon steel, and a screw portion (male screw portion) for attaching the spark plug 1 to a combustion device (for example, an internal combustion engine) on the outer peripheral surface thereof. ) 15 is formed.
- a seat portion 16 is formed on the outer peripheral surface on the rear end side of the screw portion 15, and a ring-shaped gasket 18 is fitted on the screw neck 17 on the rear end of the screw portion 15.
- a tool engagement portion 19 having a hexagonal cross section for engaging a tool such as a wrench when the metal shell 3 is attached to the combustion device is provided on the rear end side of the metal shell 3.
- a caulking portion 20 for holding the insulator 2 is provided.
- a tapered step portion 21 for locking the insulator 2 is provided on the inner peripheral surface of the metal shell 3.
- the insulator 2 is inserted from the rear end side to the front end side of the metal shell 3, and the rear end of the metal shell 3 is engaged with the step portion 14 of the metal shell 3. It is fixed by caulking the opening on the side radially inward, that is, by forming the caulking portion 20.
- An annular plate packing 22 is interposed between the step portions 14 and 21 of both the insulator 2 and the metal shell 3. As a result, the airtightness in the combustion chamber is maintained, and fuel air entering the space between the leg long portion 13 of the insulator 2 exposed to the combustion chamber and the inner peripheral surface of the metal shell 3 does not leak to the outside. Yes.
- annular ring members 23 and 24 are interposed between the metal shell 3 and the insulator 2 on the rear end side of the metal shell 3, and the ring member 23 , 24 is filled with powder of talc (talc) 25. That is, the metal shell 3 holds the insulator 2 via the plate packing 22, the ring members 23 and 24, and the talc 25.
- a ground electrode 27 made of an Ni alloy is joined to the distal end portion 26 of the metal shell 3.
- a cylindrical noble metal tip 32 made of a noble metal alloy (for example, platinum alloy) and projecting toward the center electrode 5 is provided at the tip of the ground electrode 27.
- the noble metal tip 32 is joined to the ground electrode 27 by resistance welding.
- a spark discharge gap 33 is formed between the noble metal tip 31 and the noble metal tip 32, and spark discharge is performed in the spark discharge gap 33 in a direction substantially along the axis CL1.
- a Ni plating layer as a plating layer containing Ni as a main component is formed on a portion of the ground electrode 27 excluding the tip of the side surface on the side of the center electrode 5 and on the surface of the metal shell 3. 28 (parts with a dotted pattern in the figure) are formed.
- the Ni plating layer 28 is formed as follows. That is, after forming a Ni plating film as a plating film containing Ni as a main component over the entire surface of the metal shell 3 and the ground electrode 27, the ground electrode 27 has a side surface on the side near the center electrode 5. By irradiating the laser beam and removing the Ni plating film at the site, the remaining Ni plating film constitutes the Ni plating layer 28.
- the Ni plating layer 28 is relatively thin (for example, about 10 ⁇ m).
- a melt layer 29 is formed on the surface of the side surface of the ground electrode 27 irradiated with the laser beam on the side of the center electrode 5 (in FIG. 2, the melt layer 29 is made thick for convenience). Shown).
- the molten layer 29 is formed by melting a metal component constituting the Ni plating film and a metal component (Ni alloy) constituting the ground electrode 27.
- the Ni plating layer 28 of the molten layer 29 is formed from the surface of the Ni plating layer 28 (the surface of the Ni plating layer 28, particularly the surface closest to the molten layer 29).
- the maximum length (apparent melt layer thickness) Dp along the thickness direction of the ground electrode 27 up to the portion opposite to the surface is set to be not less than the thickness of the Ni plating layer 28 and not more than 200 ⁇ m.
- the ablation (vaporization and evaporation) of the metal constituting the Ni plating film and the ground electrode 27 is generated by performing the process of irradiating the laser beam (laser process)
- the surface of the molten layer 29 is the Ni It is in a state of being dipped from the surface of the plating layer 28, and fine irregularities are formed on the surface.
- the metal shell 3 is processed in advance. That is, a through hole is formed by subjecting a cylindrical metal material (for example, an iron-based material such as S17C or S25C or a stainless material) to a cold forging process, and a rough shape is manufactured. Thereafter, the outer shape is adjusted by cutting to obtain a metal shell intermediate.
- a cylindrical metal material for example, an iron-based material such as S17C or S25C or a stainless material
- a straight rod-shaped ground electrode 27 made of an Ni alloy is resistance-welded to the front end surface of the metal shell intermediate.
- so-called “sag” is generated.
- the threaded portion 15 is formed by rolling at a predetermined portion of the metal shell intermediate body. Thereby, the metal shell 3 to which the ground electrode 27 is welded is obtained.
- a Ni plating film containing Ni as a main component over the entire surface of the metal shell 3 and the ground electrode 27 by a barrel plating apparatus (not shown). 41 is formed.
- the tip side portion of the side surface of the ground electrode 27 located on the center electrode 5 side is moved.
- Laser processing As a result, as shown in FIG. 4C, the Ni-plated film 41 at the site where the laser processing is performed is removed, the molten layer 29 is formed at the site, and the remaining Ni-plated film 41 is Ni-plated. Layer 28 will be constructed.
- the laser beam is irradiated with a relatively large melting energy so that the apparent melt layer thickness Dp is equal to or greater than the thickness of the Ni plating layer 29 (Ni plating film 41). Therefore, the molten layer 29 is not formed by melting only the Ni constituting the Ni plating film 41, but the metal component constituting the Ni plating film 41 and the metal component (Ni Alloy). On the other hand, since the melting energy of the laser beam is adjusted so as not to become excessively large, the apparent molten layer thickness Dp of the formed molten layer 29 is set to 200 ⁇ m or less.
- the noble metal tip 32 is pressed against a predetermined position of the molten layer 29 formed at the tip of the ground electrode 27, the noble metal tip 32 is resistance welded.
- the molten layer 29 is formed to be relatively thin (200 ⁇ m or less) as described above, the noble metal tip 32 is not limited to the molten layer 29 as shown in FIG.
- the ground electrode 27 is also welded.
- the insulator 2 is molded separately from the metal shell 3.
- a raw material powder mainly composed of alumina and containing a binder or the like a green granulated material for molding is prepared, and rubber press molding is used to obtain a cylindrical molded body.
- the obtained molded body is ground and shaped.
- the shaped insulator is put into a firing furnace and fired, whereby the insulator 2 is obtained.
- the center electrode 5 is manufactured separately from the metal shell 3 and the insulator 2. That is, the center electrode 5 is produced by forging a Ni alloy in which a copper alloy for improving heat dissipation is arranged at the center. Next, the noble metal tip 31 is joined to the tip of the center electrode 5 by laser welding or the like.
- the glass seal layers 8 and 9 are generally prepared by mixing borosilicate glass and metal powder, and the prepared material is injected into the shaft hole 4 of the insulator 2 with the resistor 7 interposed therebetween. Then, the terminal electrode 6 is pressed from the rear and then baked in a firing furnace. At this time, the glaze layer may be fired simultaneously on the surface of the rear end body portion 10 of the insulator 2 or the glaze layer may be formed in advance.
- the insulator 2 provided with the center electrode 5 and the terminal electrode 6 and the metal shell 3 provided with the ground electrode 27 are assembled as described above. More specifically, it is fixed by caulking the opening on the rear end side of the metal shell 3 formed relatively thin inward in the radial direction, that is, by forming the caulking portion 20.
- ground electrode 27 is bent toward the center electrode 5 so that the spark discharge gap 33 between the noble metal tips 31 and 32 is adjusted to obtain the spark plug 1 described above.
- laser light is applied to the Ni plating film 41 mainly composed of nickel formed at least on the central electrode 5 side portion of the ground electrode 27 to be bent.
- the molten layer 29 in which the metal component (Ni alloy) constituting the ground electrode 27 and the metal component constituting the plating film 41 are melted is formed at the site on the center electrode 5 side of the site to be bent. Yes. That is, the Ni plating film 41 having relatively low adhesion to the ground electrode 27 is removed by the laser light irradiation, and a molten layer 29 is formed on the surface of the ground electrode 27.
- the melted layer 29 is formed by melting Ni alloy constituting the ground electrode 27, Ni constituting the Ni plating film 41, or the like, the adhesion to the ground electrode 27 is relatively high. Are better. Therefore, even when the ground electrode 27 is bent, the Ni plating film 41 at the bent portion is removed, so that a situation such as peeling of the Ni plating film 41 cannot occur, and the melt has excellent adhesion. Peeling of the layer 29 hardly occurs. Therefore, abnormal spark discharge between the center electrode 5 and the ground electrode 27 can be suppressed, and a reduction in ignitability can be prevented more reliably.
- the Ni plating film 41 is removed by laser light irradiation. Therefore, the cost can be reduced significantly compared to the method of immersing the tip of the ground electrode in an acidic stripping solution or providing a plating layer after masking the ground electrode. The dramatic improvement in sex can be achieved.
- the noble metal tip 32 when the noble metal tip 32 is provided, the surface of the molten layer 29 formed by laser light irradiation is uneven, so that the contact area between the molten layer 29 and the noble metal tip 32 during resistance welding is reduced. As a result, the contact resistance between the two can be increased. Therefore, the noble metal tip 32 can be bonded with sufficient strength even if the pressure applied when pressing the noble metal tip 32 toward the ground electrode 27 and the applied current are relatively small.
- the apparent melt layer thickness is set to a relatively thin value of 200 ⁇ m or less. Therefore, it is possible to more reliably prevent the adhesion of the molten layer 29 to the ground electrode 27 from being impaired. Further, by setting the apparent molten layer thickness to 200 ⁇ m or less, the noble metal tip 32 is more reliably bonded not only to the molten layer 29 but also to the ground electrode 27. As a result, the noble metal tip 32 can be bonded with a further excellent bonding strength, and peeling of the noble metal tip 32 can be effectively suppressed. [Second Embodiment] Next, the second embodiment will be described with reference to FIG. 9 focusing on differences from the first embodiment.
- the ground electrode 27A is an alloy containing Ni as a main component and containing a predetermined amount (for example, 10% by mass or more) of chromium (Cr) [for example, containing about 22% by mass of Cr. Inconel (trade name) 601 and the like].
- a portion of the ground electrode 27A excluding the tip of the side surface on the side of the center electrode 5 and the surface of the metal shell 3 are provided with a Ni plating layer 28 as a plating layer containing Ni as a main component and the Ni plating.
- a chromate film 30 located on the layer 28 is formed.
- the Ni plating layer 28 and the chromate film 30 are formed as follows. That is, after forming a Ni plating film as a plating film over the entire surface of the metal shell 3 and the ground electrode 27A, the entire surface of the metal shell 3 and the ground electrode 27A is subjected to chromate treatment, and the chromate film is applied to the Ni plating film. To form a multilayer coating.
- a laser beam is applied to the multilayer coating formed on the tip side portion of the side surface of the ground electrode 27 on the side of the central electrode 5 to remove the multilayer coating at the site, thereby removing the ground electrode 27A.
- the Ni plating layer 28 and the chromate film 30 are formed on the surface of the predetermined portion or the metal shell 3.
- the ground electrode 27B is made of an alloy containing Ni as a main component and containing a predetermined amount (for example, 10% by mass or more) of Cr.
- a Ni plating layer 28A is formed on a portion of the ground electrode 27B excluding the tip of the side surface on the side of the center electrode 5 and on the surface of the metal shell 3.
- the Ni plating layer 28A is formed as follows. That is, a Ni plating film comprising Ni as a main component and containing 3 mass% or more and 30 mass% or less of Cr is formed on the entire surface of the metal shell 3 and the ground electrode 27B.
- the Ni plating layer 28A contains 3% by mass or more and 30% by mass or less of Cr
- Cr in the ground electrode 27B is on the Ni plating layer 28 side at a high temperature. It is possible to effectively suppress diffusion into the water. As a result, the effect of improving the oxidation resistance due to the inclusion of Cr in the ground electrode 27B is sufficiently exhibited.
- the outline of the plating peelability test is as follows. That is, after forming a 10 ⁇ m thick Ni-plated film over the entire surface of the ground electrode sample, by changing the output of the laser beam, a sample of a straight rod-shaped ground electrode having various apparent melt layer thicknesses was obtained. Five of each were prepared. Each sample was heated with a burner and held at 900 ° C. for 1 minute. Thereafter, after the heated sample was naturally cooled to room temperature, the sample was bent at a right angle, and it was visually confirmed whether or not the Ni plating film was peeled off at the bent portion.
- peeling of the Ni plating film may occur for a sample having an apparent molten layer thickness of less than 10 ⁇ m, that is, a sample having an apparent molten layer thickness smaller than the thickness of the Ni plated film. It became clear. This is because the output of the laser beam was relatively weak, so that the molten layer was formed by melting only the Ni constituting the Ni plating film without being melted to the Ni alloy constituting the ground electrode. It is considered that this is because the Ni plating film having insufficient adhesion to the ground electrode remained inside the molten layer.
- the laser beam output and the like are adjusted so that the apparent molten layer thickness is equal to or greater than the thickness of the Ni plating film (Ni plating layer). Is desirable.
- the sample having an apparent melt layer thickness of 0 ⁇ m is one in which a Ni plating layer is formed over the entire surface of the ground electrode without forming a melt layer (that is, performing laser processing).
- a laser plating for forming the molten layer was performed after forming a Ni plating film having a thickness of 10 ⁇ m on the surface of the ground electrode.
- the sample with an apparent melt layer thickness of 250 ⁇ m or more had a better result than the unprocessed sample, but the oxide scale progress rate could exceed 50%.
- the noble metal tip is bonded only to the molten layer (that is, the noble metal tip is not bonded to the ground electrode) because the molten layer is relatively thick, and thus the bonding strength of the noble metal tip to the ground electrode is slightly higher. However, it is thought to be due to the decline.
- a sample having an apparent melt layer thickness of 10 ⁇ m (Ni plating film thickness) or more and 200 ⁇ m or less has an oxide scale progress rate of less than 50%, and has excellent peel resistance of noble metal tips. I understood it. This is because the Ni plating film on the surface of the ground electrode was sufficiently removed and the molten layer was relatively thin, so that the noble metal tip was bonded not only to the molten layer but also to the ground electrode. Conceivable.
- the apparent molten layer thickness is set to the thickness of the Ni plating film from the viewpoint of realizing excellent peeling resistance performance of the noble metal tip. It can be said that it is significant to perform laser processing so that the thickness is not less than 200 ⁇ m.
- a spark plug sample (sample A) containing Cr in the ground electrode and having a chromate film on the Ni plating layer, and a spark plug sample (sample) having no chromate film on the Ni plating layer B) and a sample burner test was performed on both samples.
- the outline of the desktop burner test is as follows. That is, the sample was subjected to 1000 cycles with 1 cycle consisting of heating for 2 minutes with a burner so that the temperature of the ground electrode was 950 ° C. and then gradually cooling for 1 minute. . Then, it was confirmed whether or not Ni grain growth occurred in the cross section. Table 2 shows the test results of the desktop burner test for both samples.
- Sample A provided with a chromate film on the Ni plating layer was excellent in oxidation resistance without causing Ni grain growth. This is because Cr in the chromate film located on the surface side of the ground electrode diffuses toward the Ni plating layer prior to Cr in the ground electrode at high temperatures, so that Cr in the ground electrode moves to the Ni plating layer side. This is considered to be because it was possible to more reliably suppress the diffusion.
- the sample in which the content of Cr in the Ni plating layer exceeds 30% by mass was able to prevent the Ni plating layer from being peeled although the Ni grain growth was suppressed. This is considered to be because the adhesion of the Ni plating layer to the ground electrode was impaired because the Cr content was excessively large.
- the Cr content is preferably 30% by mass or less in order to sufficiently secure the peeling resistance of the Ni plating layer.
- the molten layer 29 is formed by laser processing, but the molten layer 29 may be formed by irradiating an electron beam.
- (B) Although not specifically described in the above embodiment, it is melted by performing laser processing or the like in a vacuum or performing laser processing or the like while spraying an assist gas such as nitrogen, helium or argon gas on the processing surface.
- the layer 29 may be formed. In this case, oxidation of the molten layer 29 can be effectively prevented, and durability can be improved.
- the Ni plating film 41 has a thickness of 10 ⁇ m.
- the thickness is not particularly limited. When the thickness of the Ni plating film 41 is changed, it is necessary to appropriately adjust the output of the laser beam and the like so that the apparent melt layer thickness is equal to or greater than the thickness of the Ni plating layer 28. .
- FIG. 6 (D) In the above embodiment, the noble metal tip 32 is provided on the ground electrode 27 side, but FIG. 6 (a) [FIGs. 6 (a) to 6 (c) show the ground electrode 27 before bending, respectively. As shown, the noble metal tip 32 may be omitted. In the above embodiment, the noble metal tip 32 is joined by resistance welding, but as shown in FIG. 6B, laser welding is performed instead of resistance welding or in combination with resistance welding. It is good also as forming the fusion
- FIG. 6B laser welding is performed instead of resistance welding or in combination with resistance welding. It is good also as forming the fusion
- the noble metal tip 32 is directly joined to the ground electrode 27.
- the noble metal tip 45 is connected via the relaxation layer tip 44. It may be indirectly bonded to the ground electrode 27.
- the relaxation layer tip 44 is formed.
- it is preferably formed of a metal material having a linear expansion coefficient between the Ni alloy constituting the ground electrode 27 and the noble metal alloy constituting the noble metal tip 45.
- the relaxation layer tip 44 is formed of a metal material having a linear expansion coefficient between the Ni alloy that constitutes the ground electrode 27 and the noble metal alloy that constitutes the noble metal tip 45, whereby the noble metal tip 45 is peeled off. Can further improve the performance.
- the laser processing is applied to the side surface of the ground electrode 27 on the center electrode 5 side.
- the ground electrode 27 is slightly rotated with the central axis as the rotation axis. Then, laser processing may be performed on the side surface of the ground electrode 27 on the center electrode 5 side and the side surface adjacent to the side surface.
- the technical idea of the present invention is applied to the spark plug 1 having one ground electrode 27 whose base end portion extends along the axis CL1.
- the shape and number of ground electrodes to which the idea can be applied are not limited to this. Therefore, as shown in FIG. 8A, the technical idea of the present invention may be applied to the spark plug 101 having the ground electrode 47 extending obliquely with respect to the axis CL1. Furthermore, as shown in FIG. 8B, the technical idea of the present invention may be applied to a spark plug 102 having a plurality of ground electrodes 48 bent toward the axis CL1.
- the ground electrodes 47 and 48 are slightly bent when finely adjusting the size of the spark discharge gap, so that the Ni plating film can be more reliably peeled off during the bending process. Can be prevented.
- the surface of the molten layer 29 may be smoothed by subjecting the surface of the molten layer 29 to a smoothing process (for example, laser processing again). Good. That is, it is possible to effectively suppress the occurrence of abnormal spark discharge between the center electrode 5 (the noble metal tip 31) and the molten layer 29 by smoothing the uneven portion where the electric field strength tends to be relatively high. As a result, the ignitability can be further improved.
- the noble metal tip 31 is provided at the tip of the center electrode 5, but the noble metal tip 31 may be omitted.
- the ground electrode 27 is joined to the distal end surface of the metal shell 3 .
- a part of the metal shell or the tip metal fitting previously welded to the metal shell is used.
- the present invention can also be applied to the case where the ground electrode is formed by cutting out a part of the ground (for example, JP-A-2006-236906).
- the ground electrode 27 may be joined to the side surface of the distal end portion 26 of the metal shell 3.
- the tool engaging portion 19 has a hexagonal cross section, but the shape of the tool engaging portion 19 is not limited to such a shape. Therefore, for example, it may be a Bi-HEX (deformed 12-angle) shape [ISO 22777: 2005 (E)].
- an internal combustion engine is exemplified as the combustion device, but the combustion device that can use the spark plug 1 is not limited to the internal combustion engine. Therefore, for example, the spark plug 1 may be used to ignite a fuel reformer, a boiler burner, or the like.
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Abstract
Description
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔に設けられた円筒状の絶縁体と、
前記絶縁体の外周に設けられた円筒状の主体金具と、
前記主体金具の先端部から延びるとともに、自身の略中間部分が屈曲され、自身の先端部が前記中心電極の先端部との間で火花放電間隙を形成する、ニッケルを主成分とする合金からなる接地電極とを備えたスパークプラグであって、
少なくとも前記接地電極の屈曲予定部位のうち前記中心電極側の部位に形成されたニッケルを主成分とするメッキ被膜に対して、レーザー光、又は、電子ビームを照射することにより、前記屈曲予定部位の前記中心電極側の部位に、前記メッキ被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層が形成されているとともに、前記接地電極のうち前記レーザー光、又は、電子ビームが照射された部位以外には、ニッケルを主成分とするメッキ層が形成されていることを特徴とする。
前記メッキ層は、ニッケルを主成分とし、クロムを3質量%以上30質量%以下含有することを特徴とする。
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔に設けられた円筒状の絶縁体と、
前記絶縁体の外周に設けられた円筒状の主体金具と、
前記主体金具の先端部から延びるとともに、自身の略中間部分が屈曲され、自身の先端部が前記中心電極の先端部との間で火花放電間隙を形成する接地電極とを備え、
前記接地電極が、ニッケルを主成分とし、クロムを含有する合金からなるスパークプラグであって、
少なくとも前記接地電極の屈曲予定部位のうち前記中心電極側の部位に形成されたニッケルを主成分とするメッキ被膜と当該メッキ被膜上に位置するクロメート被膜とからなる複層被膜に対して、レーザー光、又は、電子ビームを照射することにより、前記屈曲予定部位の前記中心電極側の部位に、前記複層被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層が形成されているとともに、前記接地電極のうち前記レーザー光、又は、電子ビームが照射された部位以外には、ニッケルを主成分とするメッキ層と当該メッキ層上に位置するクロメート被膜とが形成されていることを特徴とする。
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔に設けられた円筒状の絶縁体と、
前記絶縁体の外周に設けられた円筒状の主体金具と、
前記主体金具の先端部から延びるとともに、自身の略中間部分が屈曲され、自身の先端部が前記中心電極の先端部との間で火花放電間隙を形成する、ニッケルを主成分とする合金からなる接地電極とを備え、
前記接地電極及び前記主体金具の表面の一部にニッケルを主成分とするメッキ層を有してなるスパークプラグの製造方法であって、
前記接地電極が設けられた前記主体金具に対してニッケルメッキ処理を施すことによって、前記主体金具及び前記接地電極の表面略全域に前記メッキ層となるメッキ被膜を形成するメッキ被膜形成工程と、
少なくとも前記接地電極の屈曲予定部位のうち前記中心電極側の部位に対して、レーザー光、又は、電子ビームを照射することにより、前記メッキ被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層を形成する溶融層形成工程と、
前記接地電極の前記屈曲予定部位に曲げ加工を施し、前記接地電極の先端部と前記中心電極の先端部との間の前記火花放電間隙を形成する火花放電間隙形成工程とを含み、
前記溶融層形成工程においては、前記メッキ層のうち前記溶融層に最も近接する部位の表面から、前記溶融層のうち前記表面とは反対側の部位までの、前記接地電極の厚み方向に沿った最大長さが、前記メッキ層の厚さ以上となるように、前記レーザー光、又は、電子ビームを照射することを特徴とする。
前記溶融層形成工程においては、前記接地電極のうち前記貴金属チップの接合予定位置に対して前記レーザー光、又は、電子ビームを照射し、その後、前記接合予定位置に形成された溶融層に前記貴金属チップを接合することを特徴とする。
以下に、実施形態について図面を参照して説明する。図1は、スパークプラグ1を示す一部破断正面図である。尚、図1では、スパークプラグ1の軸線CL1方向を図面における上下方向とし、下側をスパークプラグ1の先端側、上側を後端側として説明する。
〔第2実施形態〕
次に、第2実施形態について、図9を参照して、上記第1実施形態との相違点を中心に説明する。
〔第3実施形態〕
次に、第3実施形態について、図10を参照して、上記第1実施形態との相違点を中心に説明する。
Claims (10)
- 軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔に設けられた円筒状の絶縁体と、
前記絶縁体の外周に設けられた円筒状の主体金具と、
前記主体金具の先端部から延びるとともに、自身の略中間部分が屈曲され、自身の先端部が前記中心電極の先端部との間で火花放電間隙を形成する、ニッケルを主成分とする合金からなる接地電極とを備えたスパークプラグであって、
少なくとも前記接地電極の屈曲予定部位のうち前記中心電極側の部位に形成されたニッケルを主成分とするメッキ被膜に対して、レーザー光、又は、電子ビームを照射することにより、前記屈曲予定部位の前記中心電極側の部位に、前記メッキ被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層が形成されているとともに、前記接地電極のうち前記レーザー光、又は、電子ビームが照射された部位以外には、ニッケルを主成分とするメッキ層が形成されていることを特徴とするスパークプラグ。 - 前記接地電極の先端部のうち前記中心電極との間で前記火花放電間隙を形成する部位には、当該部位に形成されたニッケルを主成分とするメッキ被膜に対して、レーザー光、又は、電子ビームを照射することにより、前記メッキ被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層が形成されるとともに、前記溶融層に貴金属チップが接合されることを特徴とする請求項1に記載のスパークプラグ。
- 前記接地電極は、ニッケルを主成分とし、クロムを含有する合金からなるとともに、
前記メッキ層は、ニッケルを主成分とし、クロムを3質量%以上30質量%以下含有することを特徴とする請求項1又は2に記載のスパークプラグ。 - 軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔に設けられた円筒状の絶縁体と、
前記絶縁体の外周に設けられた円筒状の主体金具と、
前記主体金具の先端部から延びるとともに、自身の略中間部分が屈曲され、自身の先端部が前記中心電極の先端部との間で火花放電間隙を形成する接地電極とを備え、
前記接地電極が、ニッケルを主成分とし、クロムを含有する合金からなるスパークプラグであって、
少なくとも前記接地電極の屈曲予定部位のうち前記中心電極側の部位に形成されたニッケルを主成分とするメッキ被膜と当該メッキ被膜上に位置するクロメート被膜とからなる複層被膜に対して、レーザー光、又は、電子ビームを照射することにより、前記屈曲予定部位の前記中心電極側の部位に、前記複層被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層が形成されているとともに、前記接地電極のうち前記レーザー光、又は、電子ビームが照射された部位以外には、ニッケルを主成分とするメッキ層と当該メッキ層上に位置するクロメート被膜とが形成されていることを特徴とするスパークプラグ。 - 前記接地電極の先端部のうち前記中心電極との間で前記火花放電間隙を形成する部位には、当該部位に形成されたニッケルを主成分とするメッキ被膜と当該メッキ被膜上に位置するクロメート被膜とからなる複層被膜に対して、レーザー光、又は、電子ビームを照射することにより、前記複層被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層が形成されるとともに、前記溶融層に貴金属チップが接合されることを特徴とする請求項4に記載のスパークプラグ。
- 前記メッキ層のうち前記溶融層に最も近接する部位の表面から、前記溶融層のうち前記表面とは反対側の部位までの、前記接地電極の厚み方向に沿った最大長さが200μm以下とされることを特徴とする請求項1乃至5のいずれか1項に記載のスパークプラグ。
- 軸線方向に延びる棒状の中心電極と、
前記軸線方向に延びる軸孔を有するとともに、前記中心電極が前記軸孔に設けられた円筒状の絶縁体と、
前記絶縁体の外周に設けられた円筒状の主体金具と、
前記主体金具の先端部から延びるとともに、自身の略中間部分が屈曲され、自身の先端部が前記中心電極の先端部との間で火花放電間隙を形成する、ニッケルを主成分とする合金からなる接地電極とを備え、
前記接地電極及び前記主体金具の表面の一部にニッケルを主成分とするメッキ層を有してなるスパークプラグの製造方法であって、
前記接地電極が設けられた前記主体金具に対してニッケルメッキ処理を施すことによって、前記主体金具及び前記接地電極の表面略全域に前記メッキ層となるメッキ被膜を形成するメッキ被膜形成工程と、
少なくとも前記接地電極の屈曲予定部位のうち前記中心電極側の部位に対して、レーザー光、又は、電子ビームを照射することにより、前記メッキ被膜を構成する金属成分及び前記接地電極を構成する金属成分が溶融した溶融層を形成する溶融層形成工程と、
前記接地電極の前記屈曲予定部位に曲げ加工を施し、前記接地電極の先端部と前記中心電極の先端部との間の前記火花放電間隙を形成する火花放電間隙形成工程とを含み、
前記溶融層形成工程においては、前記メッキ層のうち前記溶融層に最も近接する部位の表面から、前記溶融層のうち前記表面とは反対側の部位までの、前記接地電極の厚み方向に沿った最大長さが、前記メッキ層の厚さ以上となるように、前記レーザー光、又は、電子ビームを照射することを特徴とするスパークプラグの製造方法。 - 前記接地電極の先端部に、前記中心電極との間で前記火花放電間隙を形成する貴金属チップが設けられるスパークプラグの製造方法であって、
前記溶融層形成工程においては、前記接地電極のうち前記貴金属チップの接合予定位置に対して前記レーザー光、又は、電子ビームを照射し、その後、前記接合予定位置に形成された溶融層に前記貴金属チップを接合することを特徴とする請求項7に記載のスパークプラグの製造方法。 - 前記溶融層形成工程においては、前記メッキ層のうち前記溶融層に最も近接する部位の表面から、前記溶融層のうち前記表面とは反対側の部分までの、前記接地電極の厚み方向に沿った最大長さが200μm以下となるように、前記レーザー光、又は、電子ビームを照射することを特徴とする請求項7又は8に記載のスパークプラグの製造方法。
- 前記溶融層形成工程においては、酸素分圧が103Pa以下の雰囲気で、前記レーザー光、又は、電子ビームを照射することを特徴とする請求項7乃至9のいずれか1項に記載のスパークプラグの製造方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0917198A BRPI0917198A2 (pt) | 2009-02-02 | 2009-12-11 | vela de ignição e processo para a produção da mesma |
US13/058,472 US8427038B2 (en) | 2009-02-02 | 2009-12-11 | Spark plug and process for producing same |
JP2010519036A JP5216088B2 (ja) | 2009-02-02 | 2009-12-11 | スパークプラグ及びその製造方法 |
CN2009801379370A CN102165654B (zh) | 2009-02-02 | 2009-12-11 | 火花塞及其制造方法 |
EP09839263.2A EP2393171B1 (en) | 2009-02-02 | 2009-12-11 | Spark plug and process for producing same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-021069 | 2009-02-02 | ||
JP2009021069 | 2009-02-02 |
Publications (1)
Publication Number | Publication Date |
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WO2010087076A1 true WO2010087076A1 (ja) | 2010-08-05 |
Family
ID=42395343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/070723 WO2010087076A1 (ja) | 2009-02-02 | 2009-12-11 | スパークプラグ及びその製造方法 |
Country Status (7)
Country | Link |
---|---|
US (1) | US8427038B2 (ja) |
EP (1) | EP2393171B1 (ja) |
JP (1) | JP5216088B2 (ja) |
KR (1) | KR20110126654A (ja) |
CN (1) | CN102165654B (ja) |
BR (1) | BRPI0917198A2 (ja) |
WO (1) | WO2010087076A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130293087A1 (en) * | 2012-05-07 | 2013-11-07 | Ngk Spark Plug Co., Ltd. | Spark plug |
JP2014086326A (ja) * | 2012-10-25 | 2014-05-12 | Ngk Spark Plug Co Ltd | 点火プラグ |
JP2015056343A (ja) * | 2013-09-13 | 2015-03-23 | 日本特殊陶業株式会社 | スパークプラグ |
JP2015138706A (ja) * | 2014-01-23 | 2015-07-30 | 日本特殊陶業株式会社 | 主体金具の製造方法、スパークプラグの製造方法、及び、主体金具の製造装置 |
JP2015153724A (ja) * | 2014-02-19 | 2015-08-24 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
JP2017054599A (ja) * | 2015-09-07 | 2017-03-16 | 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 |
JP2020119797A (ja) * | 2019-01-25 | 2020-08-06 | 日本特殊陶業株式会社 | 点火プラグ |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103053084A (zh) * | 2010-08-03 | 2013-04-17 | 日本特殊陶业株式会社 | 火花塞 |
CN103138161B (zh) * | 2012-11-01 | 2017-03-01 | 昆明富尔诺林科技发展有限公司 | 用于火花塞的贵金属合金复合材料电极及其制造方法 |
JP5878880B2 (ja) * | 2013-02-13 | 2016-03-08 | 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 |
JP5981975B2 (ja) * | 2013-11-26 | 2016-08-31 | 日本特殊陶業株式会社 | スパークプラグ |
JP6077091B2 (ja) * | 2015-02-16 | 2017-02-08 | 日本特殊陶業株式会社 | 点火プラグ |
JP6595546B2 (ja) * | 2017-09-06 | 2019-10-23 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
US11621544B1 (en) | 2022-01-14 | 2023-04-04 | Federal-Mogul Ignition Gmbh | Spark plug electrode and method of manufacturing the same |
DE102023107904A1 (de) | 2022-03-29 | 2023-10-05 | Federal-Mogul Ignition Gmbh | Zündkerze, zündkerzenelektrode und verfahren zur herstellung derselben |
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JP2001068250A (ja) | 1999-08-26 | 2001-03-16 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法及びスパークプラグ |
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US5494706A (en) | 1993-06-29 | 1996-02-27 | Nkk Corporation | Method for producing zinc coated steel sheet |
US7569979B2 (en) * | 2006-04-07 | 2009-08-04 | Federal-Mogul World Wide, Inc. | Spark plug having spark portion provided with a base material and a protective material |
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2009
- 2009-12-11 EP EP09839263.2A patent/EP2393171B1/en not_active Not-in-force
- 2009-12-11 KR KR1020117020526A patent/KR20110126654A/ko not_active Application Discontinuation
- 2009-12-11 CN CN2009801379370A patent/CN102165654B/zh not_active Expired - Fee Related
- 2009-12-11 WO PCT/JP2009/070723 patent/WO2010087076A1/ja active Application Filing
- 2009-12-11 BR BRPI0917198A patent/BRPI0917198A2/pt not_active Application Discontinuation
- 2009-12-11 JP JP2010519036A patent/JP5216088B2/ja not_active Expired - Fee Related
- 2009-12-11 US US13/058,472 patent/US8427038B2/en active Active
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JPH0711409A (ja) * | 1993-06-29 | 1995-01-13 | Nkk Corp | 亜鉛めっき鋼板の製造方法 |
JPH08236263A (ja) * | 1995-02-24 | 1996-09-13 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法 |
JP2001068250A (ja) | 1999-08-26 | 2001-03-16 | Ngk Spark Plug Co Ltd | スパークプラグの製造方法及びスパークプラグ |
JP2005293954A (ja) * | 2004-03-31 | 2005-10-20 | Ngk Spark Plug Co Ltd | スパークプラグ |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130293087A1 (en) * | 2012-05-07 | 2013-11-07 | Ngk Spark Plug Co., Ltd. | Spark plug |
US8810118B2 (en) * | 2012-05-07 | 2014-08-19 | Ngk Spark Plug Co., Ltd. | Spark plug |
JP2014086326A (ja) * | 2012-10-25 | 2014-05-12 | Ngk Spark Plug Co Ltd | 点火プラグ |
JP2015056343A (ja) * | 2013-09-13 | 2015-03-23 | 日本特殊陶業株式会社 | スパークプラグ |
JP2015138706A (ja) * | 2014-01-23 | 2015-07-30 | 日本特殊陶業株式会社 | 主体金具の製造方法、スパークプラグの製造方法、及び、主体金具の製造装置 |
JP2015153724A (ja) * | 2014-02-19 | 2015-08-24 | 日本特殊陶業株式会社 | スパークプラグの製造方法 |
JP2017054599A (ja) * | 2015-09-07 | 2017-03-16 | 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 |
JP2020119797A (ja) * | 2019-01-25 | 2020-08-06 | 日本特殊陶業株式会社 | 点火プラグ |
JP6992017B2 (ja) | 2019-01-25 | 2022-01-13 | 日本特殊陶業株式会社 | 点火プラグ |
Also Published As
Publication number | Publication date |
---|---|
US8427038B2 (en) | 2013-04-23 |
BRPI0917198A2 (pt) | 2015-11-10 |
KR20110126654A (ko) | 2011-11-23 |
EP2393171B1 (en) | 2018-10-17 |
JPWO2010087076A1 (ja) | 2012-07-26 |
CN102165654A (zh) | 2011-08-24 |
US20110148275A1 (en) | 2011-06-23 |
EP2393171A4 (en) | 2016-11-16 |
EP2393171A1 (en) | 2011-12-07 |
CN102165654B (zh) | 2013-01-30 |
JP5216088B2 (ja) | 2013-06-19 |
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