CN101670488A - Laser welding method of noble metal spark plug electrode - Google Patents
Laser welding method of noble metal spark plug electrode Download PDFInfo
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- CN101670488A CN101670488A CN 200910042611 CN200910042611A CN101670488A CN 101670488 A CN101670488 A CN 101670488A CN 200910042611 CN200910042611 CN 200910042611 CN 200910042611 A CN200910042611 A CN 200910042611A CN 101670488 A CN101670488 A CN 101670488A
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Abstract
The invention relates to a laser welding method of a noble metal spark plug electrode. The end face of a base material of the electrode is a plane, the melting point of the base material is lower thanthat of a noble metal material, the noble metal material is directly put on the plane of the end face of the electrode of the base material, noble metal is fixed on the plane of the end face of the electrode by common resistance welding, the material is locally heated in a tiny area by laser pulse from the top of the material, and the noble metal and the plane of the end face of the base materialare respectively molten according to different time sequences. The method comprises the following steps: firstly, the central part of the plane of the end face of the electrode which is used for holding the noble metal is molten step by step, and a molten pool which is sunken inwards formed at the central part of the plane of the end face; the noble metal falls into the formed molten pool; then,the molten pool is continuously heated, and the noble metal is molten in the formed molten pool and is molten and welded together with the base material which is already molten; and after the noble metal which is molten and welded together is cooled, the noble metal is shaped and processed by common machine processing, the surface is flattened and compacted, and a spark plug electrode compoundingthe noble metal and a common material is formed.
Description
Technical field
Patent of the present invention relates to a kind of preparation method of sparking-plug electrode, refers in particular to a kind of method of making noble metal spark plug electrode by laser weld.Be mainly used in the production process of various noble metal spark plug central electrodes.
Background technology
Develop rapidly and people's improving constantly along with auto industry to environmental consciousness, client also improves day by day to the requirement of gasoline engine igniting core part one spark plug, the service life that is mainly reflected in igniting reliability, product with and to the high-tension requirement of lighting a fire.For this reason, nearly ten Nian Laiwo companies use for reference external advanced technology of the same trade, have at first released platinum spark plug and iraurite noble metal spark plug at home.But the welding of noble metal spark plug is restricting the fast development of this series products for many years as a key technology of this project.
Chinese patent ZL90105644, disclose a kind of denomination of invention and be " a kind of spark plug ambrose alloy electrode manufacturing method ", this patent major technique is that " ambrose alloy material complex technique---spark plug ambrose alloy combination electrode is made; be to adopt mechanical means that the copper core is inserted the nickel rod, and is accompanied by machinery, physics, chemical method and makes ambrose alloy combine closely into the ambrose alloy complex of real core.Multiple inside is the good copper core of heat conductivility, and is outer then be the very capable nickel protection layer of high temperature resistance, resistance to chemical attack." this patent obviously do not solve the Welding Problems of noble metal as central electrode.Chinese patent ZL 97191027.8 also discloses the relevant patent of a kind of denomination of invention for " electrode and its manufacture method that are used for sparking plug for internal combustion engine ", that this patent has proposed is a kind of " electrode that is used for sparking plug for internal combustion engine has a kind of wear-resistant overcoat of putting that covers on electrode; it is characterized in that: for the coating of electrode, a laser aid is set as the heating power source; This wear-resistant overcoat is can cover by the laser powder coating process to put under the coating material condition of using powder shape in a job step." though this patent proposed the method that wear-resistant overcoat increases welding performance, the inconvenience very that operates is difficult to grasp, and does not therefore possess practicality.Chinese patent ZL 01807145 also discloses a kind of denomination of invention and has been the relevant patent of " being used to make the method for sparking-plug electrode ", and that this patent has proposed is a kind of " has described a kind of method that is used to connect sparking-plug electrode (1,1 ') and noble metal (2).In the method, noble metal (2) is connected with electrode (1,1 ') by the heat input that the laser beam (3) by continuous operation produces." this patent is offshore company in the patent of China's application, though proposed to utilize the method for laser weld noble metal in patent, from disclosed method, mainly is to emphasize to launch continuous laser by periphery to the center.A noble metal part is inserted in the hole of central electrode, by be inserted with the side-emitted laser in noble metal hole to central electrode, the borderline region that makes central electrode be inserted with noble metal hole periphery partly or entirely fuses and welds, and the quality that facts have proved this kind side method for laser welding still is not fine.Especially noble metal the uneven phenomenon of noble metal compactness very easily occurs with after the metal of periphery is molten mutually, thus the total quality of influence welding.And adopt this kind method for laser welding, and need again noble metal be put into the hole to the processing in the advanced row of central electrode hole, technology is comparatively complicated, guarantees that the difficulty of machining accuracy is very big, therefore necessary this is further improved.
Summary of the invention
The objective of the invention is to: in order to overcome the deficiency of the noble metal electrode preparation method that has spark plug now, the invention provides a kind of noble metal electrode laser weld preparation method of new spark plug, the sparking-plug electrode of this method made forms the phenomenon in gap in noble metal bottom in the time of can effectively reducing laser weld.The spark plug that welds is out not only lighted a fire more reliable (improving the combustion gas utilization rate), and material seldom just can satisfy even exceed common spark plug life (generally can reach mill run 3 times), simultaneously because the ignition area I effectively reduces ignition voltage, adapt to the high output of automobile in recent years, low oil consumption and oligosaprobic requirement.
The present invention solves the technical scheme that its technical problem takes: a kind of method for making its electrode of spark plug, the end face that spark plug is used for the electrode matrix material of precious metal material welding is the plane, and the fusing point that is used to lay the matrix material of precious metal material is lower than precious metal material, precious metal material is made into sheet or adopts precious metal to be placed directly on the matrix material electrode end surface plane of laying precious metal material, earlier noble metal is fixed on the matrix material electrode end surface plane by the common electrical welding resistance, utilize high-octane laser pulse to carry out local heat in the tiny area again from the precious metal material top to precious metal material and matrix material electrode end surface centre, and allow the energy of laser emission pass through the diffusion inside of heat conduction to precious metal material, make precious metal material fuse according to different sequential respectively because of the different of fusing point with the matrix material electrode end surface plane of laying precious metal material, at first the core by the matrix material electrode end surface plane of laying precious metal material is progressively melted by the heat conduction in laser irradiation back, and the core on the matrix material electrode end surface plane of laying precious metal material forms the molten bath that concaves; Precious metal material will fall in the formed molten bath, matrix material electrode end surface plane this moment; Continue heating again, make precious metal material in formed molten bath, matrix material electrode end surface plane, fuse, and be welded together with the matrix material that in formed molten bath, matrix material electrode end surface plane, fuses; Again with the precious metal material that is welded together and matrix material after cooling, by common machine processing it is carried out shaping processing, make surfacing, compacting, form noble metal and the compound sparking-plug electrode of common matrix material.
This series products is mainly forms such as welding precious metal sheets or silk, and wherein, central electrode is after adopting welding, smooth again, compacting, and the reface moulding, concrete operation is that resistance welded-laser weld-pressing-Che becomes; Sheet noble metal structures on the lateral electrode is the same with the central electrode laminated structure, and production technology just need not become operation by car.
Outstanding advantage of the present invention is: the present invention is a fusing point difference of having utilized refractory metal or two kinds of different metals, carry out the laser irradiation from the top of electrode welding, carries out laser weld; This laser weld hot spot is little, and thermal deformation is little, and the welding process workpiece need not insert electric loop.Welding platinoiridita gold also is a mutual fusibleness of utilizing this principle and noble metal and nickel material equally on central electrode and the lateral electrode, makes noble metal and nickel material melt and reach welding effect fully under the prerequisite that guarantees apparent size.
Description of drawings:
Fig. 1 is a kind of center pole structural representation of platinoiridita gold spark plug
Fig. 2 is a central electrode laser weld schematic diagram of the present invention;
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing 1 is the center pole structural representation of a kind of platinoiridita gold spark plug, from the accompanying drawing external form and the structural change of central electrode and lateral electrode as can be seen.The central electrode 1 of general common spark plug and the material of lateral electrode 2 are the nickel material, its fusing point is more than 1400 degree, and for guaranteeing product service life, the common central electrode diameter that automobile is used is Φ 2.54mm, the width of lateral electrode is more than the 2.6mm, and promptly the diameter of arcing face is Φ 2.54mm.And the central electrode 1 of platinoiridita gold spark plug and lateral electrode 2 adopt than (platinum fusing point more than 1700 degree of the dystectic precious metal material of welding on the former nickel material, iridium fusing point more than 2400 degree), good conductive noble metal material generally adopts Φ 1.1mm thickness 0.2mm thin slice (see figure 1).
Characteristics of the present invention are that described laser weld is different with conventional laser weld, its welding procedure as shown in Figure 2, from accompanying drawing 2 as can be seen, the present invention is a kind of method for making its electrode of spark plug, spark plug is used for being the plane with the end face 4 of the electrode matrix material 3 of precious metal material welding, and the fusing point that is used to lay the matrix material 3 of precious metal material is lower than the precious metal material of central electrode 1, the precious metal material of central electrode 1 is made into sheet or adopts precious metal to be placed directly on the matrix material electrode end surface plane 4 of laying precious metal material, earlier the precious metal material of central electrode 1 is fixed on the matrix material electrode end surface plane 4 by the common electrical welding resistance, utilize high-octane laser pulse 5 to carry out local heat in the tiny area again from the precious metal material top of central electrode 1 to the precious metal material of central electrode 1 and matrix material 3 electrode end surfaces 4 centres, and allow the energy of laser emission pass through the diffusion inside of heat conduction to precious metal material, make the precious metal material of central electrode 1 fuse according to different sequential respectively because of the different of fusing point with the matrix material electrode end surface plane 4 of laying precious metal material 3, at first progressively melted by the heat conduction in laser irradiation back by the core on the matrix material electrode end surface plane 4 of laying precious metal material, the core on the matrix material 3 electrode end surface planes 4 of the precious metal material of laying central electrode 1 forms the molten bath that concaves; The precious metal material of central electrode 1 will fall in the formed molten bath, matrix material electrode end surface plane this moment; Continue heating again, make the precious metal material of central electrode 1 in formed molten bath, matrix material electrode end surface 4 planes, fuse, and be welded together with the matrix material 3 that in 4 formed molten baths, matrix material 3 electrode end surface planes, fuses; Again with the precious metal material that is welded together and matrix material after cooling naturally, by common machine processing it is carried out shaping processing, make surfacing, compacting, form noble metal and the compound sparking-plug electrode of common matrix material.
This kind welding method can be applied to the noble metal welding of central electrode and/or lateral electrode simultaneously; Described noble metal comprises forms such as platinum, iridium noble metal sheet structure.Described laminated structure is to adopt the welding back to flatten moulding, and concrete operation is: central electrode resistance welded-laser weld-pressing-Che becomes; Sheet noble metal structures on the lateral electrode is the same with the central electrode laminated structure, and production technology just need not become operation by common mach car, only needs central electrode resistance welded-laser weld-pressing to get final product.
Claims (6)
1, a kind of method for laser welding of noble metal spark plug electrode, it is characterized in that: the end face that spark plug is used for the electrode matrix material of noble metal welding is the plane, and the fusing point that is used to lay the matrix material of precious metal material is lower than precious metal material, precious metal material is made into sheet or adopts precious metal to be placed directly on the matrix material electrode end surface plane of laying precious metal material, by the common electrical welding resistance noble metal is fixed on the electrode end surface plane, utilize high-octane laser pulse to carry out local heat in the tiny area from the material top to material, the energy of laser emission is by the diffusion inside of heat conduction to material, make noble metal fuse according to different sequential respectively with the electrode end surface plane of laying noble metal, at first the core by the electrode end surface plane of laying noble metal is progressively melted by the heat conduction in laser irradiation back, and the core on the electrode end surface plane of laying noble metal forms the molten bath that concaves; Noble metal will fall in the formed molten bath, electrode end surface plane of laying noble metal this moment; Continue heating again, make noble metal in laying the formed molten bath, electrode end surface plane of noble metal, fuse, and be welded together with the electrode end surface planar substrates material of laying noble metal in the formed molten bath, electrode end surface plane of laying noble metal of having fused; Again with the noble metal that is welded together after cooling, by common machine processing it is carried out shaping processing, make surfacing, compacting, form noble metal and the compound sparking-plug electrode of common material.
2, the method for laser welding of noble metal spark plug electrode as claimed in claim 1 is characterized in that: described welding method can be applied to the noble metal welding of central electrode and/or lateral electrode simultaneously.
3, the method for laser welding of noble metal spark plug electrode as claimed in claim 1 is characterized in that: described noble metal comprises forms such as platinum, iridium noble metal sheet structure.
4, the method for laser welding of noble metal spark plug electrode as claimed in claim 3 is characterized in that: described laminated structure is to adopt the welding back to flatten moulding.
5, the method for laser welding of noble metal spark plug electrode as claimed in claim 4 is characterized in that: described welding back flattens the concrete operation of moulding and is: central electrode resistance welded-laser weld-pressing-Che becomes.
6, the method for laser welding of noble metal spark plug electrode as claimed in claim 4, it is characterized in that: described welding back flattens the concrete operation of moulding and is: the sheet noble metal structures on the lateral electrode is the same with the central electrode laminated structure, production technology just need not become operation by common mach car, only needs central electrode resistance welded-laser weld-pressing to get final product.
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| CN 200910042611 CN101670488A (en) | 2009-02-05 | 2009-02-05 | Laser welding method of noble metal spark plug electrode |
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| CN 200910042611 CN101670488A (en) | 2009-02-05 | 2009-02-05 | Laser welding method of noble metal spark plug electrode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102522701A (en) * | 2011-12-07 | 2012-06-27 | 株洲湘火炬火花塞有限责任公司 | Laser welding method of side electrode precious metal of spark plug |
| CN103765708A (en) * | 2011-07-28 | 2014-04-30 | 田中贵金属工业株式会社 | Clad electrode for spark plug and method for manufacturing same |
| CN105247747A (en) * | 2013-05-21 | 2016-01-13 | 株式会社电装 | Method for manufacturing spark plug for internal combustion engine |
-
2009
- 2009-02-05 CN CN 200910042611 patent/CN101670488A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103765708A (en) * | 2011-07-28 | 2014-04-30 | 田中贵金属工业株式会社 | Clad electrode for spark plug and method for manufacturing same |
| CN102522701A (en) * | 2011-12-07 | 2012-06-27 | 株洲湘火炬火花塞有限责任公司 | Laser welding method of side electrode precious metal of spark plug |
| CN102522701B (en) * | 2011-12-07 | 2012-12-26 | 株洲湘火炬火花塞有限责任公司 | Laser welding method of side electrode precious metal of spark plug |
| CN105247747A (en) * | 2013-05-21 | 2016-01-13 | 株式会社电装 | Method for manufacturing spark plug for internal combustion engine |
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Application publication date: 20100317 |