WO2012039381A1 - スパークプラグ用の電極を形成するための電極用複合体の製造方法、及びスパークプラグの製造方法 - Google Patents
スパークプラグ用の電極を形成するための電極用複合体の製造方法、及びスパークプラグの製造方法 Download PDFInfo
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- WO2012039381A1 WO2012039381A1 PCT/JP2011/071344 JP2011071344W WO2012039381A1 WO 2012039381 A1 WO2012039381 A1 WO 2012039381A1 JP 2011071344 W JP2011071344 W JP 2011071344W WO 2012039381 A1 WO2012039381 A1 WO 2012039381A1
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- electrode
- chuck
- chip
- electrode member
- tip
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T21/00—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs
- H01T21/02—Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs of sparking plugs
-
- 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
-
- 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
- H01T21/06—Adjustment of spark gaps
Definitions
- the present invention relates to a spark plug used for ignition of an engine, and more particularly to an electrode composite for forming an electrode for the spark plug, wherein a first electrode member and a second electrode member are welded.
- the present invention relates to a method for manufacturing an electrode composite and a method for manufacturing a spark plug.
- Some spark plugs of this type are formed by welding a noble metal tip such as platinum or iridium to each end of the center electrode or the ground side electrode on the spark gap side in order to enhance the ignitability.
- a noble metal tip such as platinum or iridium
- FIG. 10-A instead of a noble metal chip alone, a chip body (hereinafter also referred to as a first chip) 11 made of Ni or the like as a first electrode member in advance, A noble metal tip (hereinafter also referred to as a second tip) 21 which is a separately formed second electrode member is positioned and welded as shown in FIG. 10-B to form a composite tip 31 which is an electrode composite.
- a technique in which this is welded to the ground side electrode body (or the center electrode body) formed at the tip of the metal shell of the spark plug, for example, through the chip body 11 side Patent Document 1).
- Patent Document 2 Patent Document 1
- FIG. 11 shows an example of such a spark plug 41, which includes an insulator 43 having an axial hole in the direction of the axis G, a center electrode 71 disposed on the tip side of the axial hole, and an insulator.
- the spark plug 41 includes a metal shell 51 that surrounds the periphery of 43, and a ground-side electrode 61 that has one end joined to the tip 52 of the metal shell 51 and the other end facing the tip of the center electrode 71.
- the ground side electrode 61 is formed by joining a composite chip 31 in which the first chip 11 and the second chip 21 are joined to the ground side electrode body 60.
- such a noble metal tip (second tip) 21 has a minute cylindrical shape having an outer diameter of 1 mm or less (for example, about 0.7 to 0.8 mm) and a height of about 0.5 mm. is there. And the outer diameter of the end surface (tip surface) 13 which is the joint surface of the counterpart tip body (first tip) 11 to which the end surface 23 of the second tip 21 is welded is also, for example, about 0.8 mm. And it is minute. On the other hand, the portion 15 where the counterpart first chip 11 is joined to each electrode (center electrode or ground electrode) is formed to have a relatively large diameter. Therefore, as shown in FIG.
- such a first chip normally has a base 15 having an end face 12 on the side joined to each electrode (center electrode, ground side electrode) having a large diameter, and the second chip.
- the end surface 13 side (tip surface side) to which 21 is welded has a convex cylindrical structure with concentric and different diameters forming a cylindrical portion 17 with a small diameter.
- the operation has been conventionally performed as follows.
- the first chip 11 is held by the chuck 81, and the second chip 21 is positioned on the first chip 11 and welded.
- the chuck 81 sandwiches and holds the outer peripheral surface of the base 15 having the large diameter of the first chip 11, and the cylindrical portion 17 on the small diameter side of the held first chip 11.
- the end surface 23 of the second chip 21 is positioned and placed concentrically on the end surface 13, and the other end surface is pressed by a pressing pin (not shown). Then, under this pressing state, the chuck 81 is rotated around its central axis C1, and the outer peripheral edges of the end surfaces to be joined of the two chips 11, 21 are laser welded in a circular manner.
- a chuck of a collet chuck mechanism having a plurality of chuck claws (hereinafter also simply referred to as claws) 83 is usually used for the chuck 81 as described above.
- claws chuck claws
- FIG. 12 in such a chuck 81, by driving one cylinder (not shown), it is orthogonal to the rod and is usually equiangularly spaced (3) as viewed from the axial direction of the rod.
- Each of the claws 83 arranged equally) is advanced at the same speed in the direction of closing the claws 83 at the same time to tighten the first chip 11.
- the first chip 11 is fixed correctly and concentrically to the center (reference center axis) C1 serving as the reference of the chuck surface 82 of the chuck 81.
- the first chip 11 when the first chip 11 is chucked with such a chuck 81, the first chip 11 is concentric with the reference center (the reference center axis of the chuck) C1 indicated by the broken-line circle in FIG. As shown in an exaggerated manner with a solid circle from the position where the position is formed, in many cases, although it is a minute amount, it is fixed in a state where there is a deviation (eccentric error) Z. That is, the actual center axis (also referred to as the center) C2 of the first chip 11 is fixed at a position that is eccentric from the reference center axis C1 of the chuck 81, as shown in FIG.
- the chuck 81 is set in advance. Since the reference center axis C1 of the chuck 81 is constant, the second tip 21 is controlled to be arranged around the center axis C1. The error of the central axis of the second chip 21 can be suppressed to a negligible level (error of 0.005 mm) compared to the inherent error that inevitably occurs based on the chuck mechanism. That is, the second chip 21 can be arranged with high accuracy with respect to the reference center axis C1 of the chuck 81 by a supply means using a servo mechanism or the like with almost no error.
- the tolerance of the misalignment (axiality) of the second chip with respect to the first chip is an inherent error that is inevitably generated based on the chuck mechanism, which occurs when the first chip is chucked. Therefore, it is necessary to give an eccentricity error Z of at least about ⁇ 0.025 mm as an allowable range on one side.
- the axial degree (eccentricity) of both is measured and detected by image processing or the like.
- eccentricity error
- a position correction is a position correction after the second chip is once supplied and arranged on the first chip. Therefore, there is a problem such that the end faces of both chips in contact with each other are rubbed and scratched. May occur.
- the position correction is performed after the second chip is supplied and arranged on the first chip, the number of processes increases, causing a reduction in the manufacturing efficiency of the composite chip, resulting in a decrease in the productivity of the spark plug. It may also cause Further, after the second chip is shifted with respect to the first chip held by the chuck and is coaxially corrected, the chuck is rotated and the outer peripheral edge of the joint surface is welded. Is the reference center axis C1 of the chuck, whereas the actual center axes of both chips are offset from the reference center axis C1 by an error. For this reason, there also exists a problem that the distance (laser irradiation distance) to a laser welding apparatus and a welding object site
- the problem described above is to manufacture a composite chip that is a composite for an electrode formed by welding a first chip (chip body) that is a first electrode member and a second chip (noble metal chip) that is a second electrode member. It is not limited to cases.
- the spark plug 41 illustrated in FIG. 11 has an electrode composite in which a center electrode 71 is composed of a center electrode body 70 as a first electrode member and an electrode tip 77 as a second electrode member welded to the tip thereof. I am doing.
- the center electrode body 70 is chucked, and the electrode tip 77 is supplied to the tip to be positioned. This is because the production was performed through the same steps as described above. That is, not only in the composite chip 31 and the center electrode 71 described above, but in the manufacture of an electrode composite formed by welding the first electrode member and the second electrode member to form an electrode for a spark plug. There was a similar problem for the same reason as described above.
- the present invention has been made in view of the above-described problems.
- the second electrode member is attached to the first chip (chip body) which is the first electrode member without incurring defects such as a decrease in manufacturing efficiency and scratches.
- electrodes for spark plugs such as composite tips made by precious metal tips (second tips) that can be efficiently arranged and welded with high coaxial accuracy and welded together. It is an object of the present invention to provide a method for efficiently producing a composite and a method for producing a spark plug.
- the invention according to claim 1 is a method for producing a composite for an electrode for forming an electrode for a spark plug, wherein the first electrode member and the second electrode member are joined by laser welding.
- In the method of manufacturing a composite for an electrode for forming an electrode for a spark plug including a laser welding step of welding outer peripheral edges of both end faces where the first electrode member and the second electrode member are in contact with each other.
- the center axis position correcting step is provided.
- the electrode for a spark plug according to claim 1 further comprising a temporary welding step of temporarily welding outer peripheral edges of both end faces where the first electrode member and the second electrode member are in contact with each other. It is a manufacturing method of the composite_body
- a plurality of the chuck units are arranged so as to move sequentially in the circulating movement means that rotates. 3.
- a plurality of the chuck units are arranged so as to sequentially move along with the circulation of the rotation of the chuck unit.
- an insulator having an axial hole in an axial direction, a center electrode disposed on a tip end side of the axial hole, a metal shell surrounding the periphery of the insulator, and one end of the metal shell A ground side electrode provided so that the other end faces the tip of the center electrode,
- the center electrode or the grounding side electrode is formed by bonding a first electrode member and a second electrode member to each other, or the electrode complex.
- a spark plug manufacturing method, wherein the electrode composite is manufactured by the manufacturing method according to any one of claims 1 to 4.
- the actual center axis of the first chip is the reference center of the chuck. Even if there is an eccentric error with respect to the shaft, that is, the base shaft of the base that rotatably supports the chuck constituting the chuck unit (the base shaft of the chuck unit), even if the eccentric error exceeds the allowable range, the first chip Before supplying and positioning the second electrode member (for example, the second chip; hereinafter also referred to as the second chip), the actual center axis position of the first chip is set to the base axis of the base of the chuck unit.
- the position to be adjusted to the axis (position) is corrected. Therefore, the position of the first chip after correcting the position in this way is at the position of the base shaft without error accompanying the chuck. Therefore, when supplying and positioning the second chip to the first chip at such a position, both chips can be easily arranged with high precision coaxiality. After that, when the chuck unit is rotated around the axis of the base shaft and both are welded, the center axis of both tips is kept highly coaxial with the base shaft. Composites can be obtained.
- the coaxiality of both chips is measured, and the error is outside the allowable range. Since the axial degree (eccentricity error) of the second chip with respect to the first chip is not adjusted, the joint surfaces (the contact end surfaces of the two chips) do not rub against each other, so there is no scratch. In addition, the efficiency of this welding process is achieved by including a temporary welding process like invention of Claim 2.
- the eccentric error detection step and the central axis position correction step may be performed at the same position in the circulation process as described in claim 3. Further, as described in claim 4, it is preferable that the first electrode member holding step and the eccentric error detecting step are performed at different positions in the circulation process. That is, for example, after supplying and holding the first chip, which is the first electrode member, the circumferential moving means is driven, and the chuck unit holding the first chip is moved and stopped by a predetermined amount. In other words, the position of the first chip held by the chuck is measured by image processing at a position different from the supply position, and the actual position of the first chip is measured. An eccentric error between the position of the central axis and the base axis of the chuck unit is detected.
- the required time in each step can be shortened, so that the production efficiency of the composite for electrode (for example, composite chip) can be improved. This is because it can be increased.
- the second electrode member is used as the first electrode member, the coaxial accuracy is not deteriorated, and the bonding surface is not scratched. Composites can be produced.
- FIG. 4 is a diagram for explaining an eccentricity error Z when a first chip that is a first electrode member is fixed to the chuck in FIG. 3.
- FIG. 5 is an explanatory view when the position is corrected by driving the chuck position adjusting means so that the actual center axis C2 of the first chip which is the first electrode member in FIG.
- FIG. 4 coincides with the axis C3 of the base axis.
- FIG. 7 is an explanatory diagram in which a second chip that is a second electrode member is supplied and positioned on a first chip that is a first electrode member in FIG. 6.
- FIG. 4 is an enlarged elevation view for explaining the chuck unit when the electrode composite to be manufactured is a center electrode in FIG. 3. It is a figure explaining the structure of a composite chip
- tip is arrange
- the composite body for an electrode manufactured in this example is the composite chip 31 shown in the right figure (B) of FIG.
- the first electrode member constituting the composite chip 31 is the first chip 11
- the second electrode member is the second chip 21. Details are as follows.
- the first chip (nickel chip body) 11 constituting the composite chip 31 has a disc-shaped base 15 and a smaller diameter (for example, an outer diameter of 0.78 mm), and is concentric on the upper end surface of the base 15 in the drawing.
- the second chip (a chip made of noble metal (for example, Pt)) 21 is the same as that shown in the left figure (A) of FIG. Is formed in a cylindrical shape of 0.75 mm).
- the second chip 21 forming the spark gap side is supplied onto the end surface 13 of the small diameter portion of the first chip 11, and the end surface of the second chip 21 is supplied.
- 23 is positioned so as to be concentric with the end face 13 of the first chip 11, and the outer peripheral edges of both end faces 13, 23 where both the chips 11, 21 are in contact are laser-welded along the circumferential direction to form the composite chip 31. It is what you make.
- the composite tip 31 is then welded to a ground-side electrode body (or center electrode) 61 welded to the tip 52 of the spark plug metal shell 51 in this example.
- a spark plug 41 is formed.
- the allowable coaxiality (allowable eccentricity error) is as small as 0.015 mm on one side, for example, and the second tip does not protrude outward from the small-diameter cylindrical portion of the first tip. This is the allowable limit of eccentricity error.
- FIG. 1 is a schematic configuration diagram when a circular table 101 on which each chuck unit 110 is arranged is viewed from above.
- the circular table is configured to rotate intermittently, with its center as the center of rotation, rotating 60 degrees with a rotation driving means (not shown) and stopping.
- each chuck unit 110 is on an imaginary circle 103 centering on the center 100 of the circular table 101 and intersects with a straight line 105 that divides the imaginary circle 103 into six equal parts (the same imaginary one).
- the center C1 is the intersection of the circle 101 and the radius line 105 drawn radially at equal angular intervals of 60 degrees from the rotation center 100 of the circular table 101. Arranged and attached with dimensional accuracy. Accordingly, when the circular table 101 rotates 60 degrees, each chuck unit 110 also moves corresponding to the rotation with the virtual circle 103 as a trajectory (in this example, the counterclockwise rotation (circulation) in FIG. 1). Has been.
- each chuck unit 110 is rotatably arranged on the circular table 101 around the intersection point with the radius line 105 that divides the virtual circle 103 into six equal parts.
- FIG. 1 shows a case where the circular table 101 is not rotating (when it is at a stop position).
- Each chuck unit 110 has a chuck 81 of the collet chuck 81 type including a plurality of (three in this example) chuck claws 83 capable of holding the outer peripheral side of the base portion 15 of the first chip 11 at the uppermost portion thereof.
- a chuck base 85 incorporating a chuck driving means (such as an air cylinder) (not shown) for opening and closing the chuck 81.
- the chuck 81 includes such a chuck base 85.
- the chuck base 85 including the chuck 81 is an upper part of a known chuck position adjusting means 90 that can adjust the position of the reference central axis C1 of the chuck 81 in two directions (X and Y directions) orthogonal to each other in plan view. Is arranged.
- the chuck position adjusting means 90 includes a horizontal slide body (board) 91 that slides in a plan view, for example, in the X direction, along the guide on the base 120 below, and the horizontal slide body (board) 91.
- the upper slide body 93 is configured to slide along the guide in the Y direction perpendicular to the X direction in plan view, and a servo mechanism (not shown) that drives them in the X and Y directions, respectively. .
- the chuck base 85 is fixed so as to be supported on the vertical slide body 93 that forms the chuck position adjusting means 90.
- the base 120 that supports the chuck position adjusting means 90 has a base shaft 92 provided at the bottom thereof at the intersection of the virtual circle 103 in the circular table 101 and the radius line 105 drawn at intervals of 60 degrees. Is arranged on the circular table 101 by being supported by a bearing 106 arranged with high accuracy.
- the base shaft 92 is provided so as to be rotated by a chuck unit rotation driving means (not shown), and each chuck unit 110 is rotated on the circular table 101 in accordance with the drive.
- the reference center axis C1 of the chuck 81 is held coaxially with the axis C3 of the base shaft 92 as a design reference position (same axis).
- the base shaft 92 is rotated with respect to the circular table 101, so that the base 120 integrated with the base shaft 92, the chuck position adjusting means 90 provided thereon, and further provided thereon.
- a chuck unit 110 including a chuck 81 is provided so as to be able to rotate via a rotation driving means (not shown).
- the base shaft 92 and the reference center axis C1 of the chuck 81 are set so as to be coaxial when the chuck position adjusting means 90 is at the reference position. For this reason, when the base shaft 92 is rotated with respect to the circular table 101 when the chuck position adjusting means 90 is at the reference position, the chuck 81 coincides with the axis (center line) of the base shaft 92. It is set as the structure rotated on the center of rotation. In this example, the rotation of the base shaft 92 is set so as to be performed when the circular table 101 is stopped during the rotation process (rotation process) of the circular table 101.
- the position of the right end in FIG. 1 is described as the position where the first chip 11 as the first electrode member is supplied and arranged, that is, the process start position (first position) P1
- the circular table 101 is rotationally driven to stop, and the first chip 11 is placed on the chuck 81 of the chuck unit 110 at the start position by the first chip supply means (first electrode member supply means, not shown).
- the first chip 11 is placed from above the chuck 81 and held (chucked) so that the base portion 15 faces the chuck surface 82 side.
- the circular table 101 is rotated (rotated left) by 60 degrees, stopped, and when this is repeated, the chuck unit 110 is moved from the second position P2 to the sixth position P6 in order, and the circular orbit (the circle of the virtual circle 103).
- the following process is performed at each stop position. That is, at each position (stop position) after the second position P2, the position correction of the first tip 11, supply of the second tip 21 as the second electrode member and provisional welding, the first tip 11 and the second tip are sequentially performed.
- the main welding with 21, the image inspection of the welding state, etc., and the discharge (removal) of the composite tip 31 that is the welded electrode composite are performed. Each of these steps will be described in order from the step at the start position (first position) P1 along the steps.
- the first chip 11 is supplied to the chuck 81 in the open state. Then, as described above, the claw 83 of the chuck 81 is driven and the base portion 15 is sandwiched and held from the outer peripheral surface side to hold the first tip member holding step (hereinafter referred to as the first tip holding step). (Also referred to as a process).
- the chuck 81 of this example is configured to have three chuck claws 83 arranged at three equal angular intervals in plan view and simultaneously move along the chuck surface 82 by an equal amount toward the center of the chuck 81. .
- each chuck claw 83 has an inner side (inside of the claw 83) so that a component force is generated to push (pull) the base portion 15 toward the chuck surface 82 when tightened.
- An inclined surface that is inclined by an appropriate amount (5 to 15 degrees) is provided so that the position of the reference center axis C1 side) away from the chuck surface 82 is directed toward the reference center axis C1 of the chuck 81.
- the first chip 11 is prevented from floating from the chuck surface 82 when the chuck 81 is in operation.
- the first chip 11 is positioned on the chuck surface so that the base portion 15 is located at the center of the chuck 81 in the open state at the first position P1 via the first chip supply means including a conventionally known parts feeder. 82 is supplied.
- the actual center axis C2 of the first chip 11 has a slight deviation (eccentric error) Z with respect to the reference center axis C1 of the chuck 81 or the axis C3 of the base shaft 92, and the eccentricity thereof.
- the amount is about 0.025 mm on one side as described above.
- the circular table 101 is rotated by 60 degrees and stopped.
- the chuck unit 110 in a state where the first chip 11 is chucked is moved to the second position and stops there.
- the stop position (second position) P2 the actual position of the center axis C2 in the first chip 11 held by the chuck 81 is measured by image processing.
- the central axis of the first chip 11 is set in advance as the position where the central axis of the first chip 11 should be originally located at the position of the actual central axis C2 of the first chip 11 and its stop position.
- the amount of eccentricity (eccentric error: Ex, Ey) in the X direction and Y direction with respect to the position (regular reference position) is detected. Since this reference position is also the position of the base axis 92 of the chuck unit 110 in this example, an eccentricity error Z on the plane with respect to the position of the actual center axis C2 of the first chip 11 with respect to the position of the axis C3 of the base axis 92 is calculated. To detect.
- the chuck position adjusting means 90 is driven, as shown in FIG.
- the planar position of the chuck 81 is adjusted so that the position of the actual central axis C2 of the chip 11 is aligned with the position of the axis C3 of the base shaft 92.
- the center axis position correcting step of the first chip is performed by placing the horizontal slide body 91 and the vertical slide body 93 constituting the chuck position adjusting means 90 as described above in the X direction and the Y direction, respectively.
- the position of the actual central axis C2 of the first chip 11 is adjusted to the position of the axis C3 of the base shaft 92. Even after such adjustment, there is an eccentric error Z of the actual center axis C2 of the first tip 11 with respect to the reference center axis C1 of the chuck 81.
- the measurement of the actual position of the center axis C2 of the first chip 11, etc., that is, the eccentricity error detection step and the center axis position correction step of the first chip may be performed as follows. For example, the tip surface (tip surface of the cylindrical portion) 13 of the first chip 11 is photographed with a camera and displayed on the monitor, and the center (or outside) of the tip surface (tip surface of the cylindrical portion) 13 of the first chip 11 is displayed. Perimeter) The position of C2 is measured by image processing.
- the center axis C2 is planarly arranged in the X direction with respect to a normal reference position (position of the axis C3 of the base shaft 92) set in advance as the position to be located at the second position P2.
- How much error (Ex, Ey) is present in the Y direction error detection
- the chuck position adjusting means 90 is driven to move the slide bodies 91 and 93 in the X direction or the Y direction.
- fine adjustment is performed by sliding a predetermined amount (first axis (first electrode member) center axis position correcting step).
- first axis (first electrode member) center axis position correcting step fine adjustment is performed by sliding a predetermined amount (first axis (first electrode member) center axis position correcting step).
- the center axis C2 of the actual tip surface of the first chip 11 tip surface of the cylindrical portion
- the driving of the camera and the chuck position adjusting means 90 is set so as to sequentially operate by detecting the signal sent from the chuck unit 110 to the second position P2, and the chuck unit 110 is set to operate the chuck position adjusting means 90.
- the circular table 101 is rotated by 60 degrees and stopped.
- the chuck unit 110 in a state where the actual center axis C2 of the first chip 11 is position-corrected to the axis C3 of the base shaft 92 is moved to the third position P3 while maintaining the state of FIG. .
- the second electrode (Pt tip) 21 supply hereinafter also referred to as a second tip supply step
- temporary welding temporary welding step
- the second chip 21 is held by gripping its outer peripheral surface by a supply unit 130 including a conventionally known handling unit 131 and a conveying unit 133 as shown in FIG.
- the first end face 23 is placed so as to be positioned on the front end face of the small-diameter cylindrical portion of the first chip 11 at the third position P3.
- the alignment of the second chip 21 with respect to the position of the first chip 11 becomes a problem, but the first chip 11 has a central axis C2 of the axis C3 of the base shaft 92 in the chuck unit 110. It has been corrected to match.
- the problem is only the movement accuracy when the center C2 of the second chip 21 is aligned with the axis (center) C3 of the base shaft 92.
- Such movement of the second chip 21 uses a servo mechanism or the like.
- the supply means 130 it is possible to arrange with high accuracy of several ⁇ to 10 ⁇ units without substantial error, so that no problematic error occurs in the supply and arrangement of the second chip 21.
- the tip surface of the second chip 21 is pressed, for example, at the third position P3.
- Laser welding may be performed so as to circulate around the outer peripheral edges of both end faces 13 and 23 where both the chips 11 and 21 are in contact with each other while being pressed with a pin.
- a part of the outer peripheral edge is used here. Includes a temporary welding process in which laser is irradiated with one pulse to perform temporary welding (see FIG. 8).
- a laser welding apparatus 201 for temporary welding is arranged (see FIG. 1).
- the presser pin is set to rise after temporary welding.
- the circular table 101 is rotated by 60 degrees and stopped, and the chuck unit 110 in a state where the first chip 11 on which the second chip 21 is temporarily welded is chucked 81 is shown in FIG.
- An example of moving to the fourth position P4 and performing the main welding of both the tips 11 and 21 is illustrated here. That is, at the fourth position P4, both the chips 11 and 21 are laser welded so as to go around the outer peripheral edge of the joint surface between the first chip 11 and the second chip 21.
- a chuck unit (not shown) of the base unit 92 provided at the bottom of the base 120 that supports the chuck position adjusting means 90 of the chuck unit 110 with respect to the circular table 101 is not shown.
- the laser welding device 301 is rotated approximately one time through the 110 rotation driving means, and the laser welding apparatus 301 disposed in the vicinity of the fourth position P4 performs pulse laser welding an appropriate number of times (for example, eight times) during the rotation process. It is said. By doing so, as shown in the right diagram of FIG. 10, a composite tip 31 in which the second tip 21 is laser-welded to the first tip 11 is obtained.
- the center of rotation of the chuck unit 110 during the laser welding process is the axis C3 (center) of the base shaft 92.
- the actual center axis C2 of the first tip 11 can be obtained by the position correction described above. It is on the axis C3 of the base axis that is the center of the base shaft 92, and the second chip 21 maintains a high degree of concentricity with the first chip 11. For this reason, even if the laser welding apparatus 301 is fixed, there is no deviation in the laser irradiation distance. It should be noted that such main welding is preferably performed in a state where the second tip 21 is pressed by the second pressing pin 305 as shown in FIG.
- the second pressing pin 305 is installed so as to rotate in synchronization with the rotation of the chuck unit 110, or is freely rotated synchronously through a thrust bearing.
- the laser welding apparatus 301 is provided with a correction means for correcting the laser irradiation position (height), and the height of the joint surface of both the chips 11 and 21 is detected by a sensor. It should be possible to adjust automatically. This is because a minute dimensional tolerance is also given to the height of the first chip 11 itself.
- argon gas blowing means 307 is provided toward the welding site so that the same gas is blown in the welding process, and welding spatter is generated on the surface of the composite tip 31. It is good to prevent it from adhering to.
- the composite tip 31 is manufactured by performing the main welding at the fourth position P4 as described above.
- the circular table 101 is then rotated by 60 degrees and stopped at the fifth position P5.
- an appearance inspection is performed by an image inspection process for adhesion of weld spatter on the surface including the welded portion of the composite chip 31 and the presence or absence of welding sag.
- the base shaft 92 in the chuck unit 110 may be rotated to inspect the appearance.
- the welding spatter or welding sag can be easily detected as a protruding portion (convex portion) by the rotation.
- the chuck unit 110 is sent to the sixth position P6 which is the discharge position, the chuck 81 is released, and the composite chip after the main welding is performed.
- the welded composite tip 31 is taken out.
- each composite chip 31 is discharged so as to be classified according to pass / fail based on the determination of pass / fail of the appearance inspection at the position P5 (good product, defective product).
- the chuck unit 110 after the composite chip 31 is taken out is sent to the process start position which is the first position P1 by rotating the circular table 101 by 60 degrees.
- the chuck position adjusting means 90 is driven again to reset the reference center axis C1 of the chuck 81 to coincide with the base axis 92 of the chuck unit 110. It is good to leave. Thereafter, similar to the above, by repeating each process starting from the supply of the first chip 11, composite chips 31 that are composites for electrodes are manufactured one after another.
- the manufacturing method of the present embodiment after the first chip 11 that is the first electrode member is held by the chuck 81, the actual center axis C ⁇ b> 2 of the first chip 11 is the reference of the chuck 81. Even if the center axis C1 and the axis of the base shaft 92 are deviated beyond the allowable range, the first tip 21 serving as the second electrode member is supplied and positioned at the second position P2 before the first tip 21 is positioned. The position of the tip 11 is adjusted to the position of the base shaft 92 to be corrected.
- the actual position of the central axis C2 of the first tip 11 and the chuck An eccentric error detecting step for detecting an eccentric error with the base shaft 92 of the base 120 that rotatably supports the chuck 81 constituting the unit is included.
- the eccentric error has an allowable range.
- the center axis position correcting step of the first chip for correcting the actual center axis C2 of the first chip to the axis C3 of the base axis 92 of the base 120 is provided.
- both chips 11 and 21 are arranged concentrically with the base shaft 92 with a high degree of axial accuracy. Can do. Therefore, after that, when the chuck unit 110 is rotated around the axis C3 of the base shaft 92 and both are welded, the composite chip 31 with high axial accuracy can be obtained efficiently.
- the second chip 21 as the second electrode member is supplied and positioned on the first chip 11 as the first electrode member held by the chuck 81 (the supply of the second chip 21).
- the concentricity of the two chips 11 and 21 is measured, and when it has an error outside the allowable range, the axial degree (eccentric error) of the second chip 21 with respect to the first chip 11 is adjusted. Therefore, the joint surfaces (the contact end surfaces of the two chips) 13 and 23 are not rubbed with each other, so that they are not scratched.
- the chuck unit 110 is provided on the circular table 101 at six equiangular intervals on one virtual circle 103 concentric with the rotation center 100, and each position P1 to 60 ° is set every 60 degrees.
- the supply and holding process of the first chip 11 as the first electrode member to the chuck 81, the eccentricity error detection process and the center axis position correction process of the first chip 11, and the second chip 21 as the second electrode member The supply chip, the temporary welding process, the main welding, the image inspection, and the discharging process of the welded composite chip 31 are performed, and the composite chip is manufactured and discharged while the circular table 101 is rotated once. That is, since the process divided into a plurality of steps is performed separately at each stop position corresponding to the number of steps, the stop time at each stop position can be shortened. The production efficiency of a certain composite chip 31 can be significantly increased.
- the position detection (eccentricity error detection process) of the first chip 11 as the first electrode member and the position correction (center axis position correction process) are performed by the rotation process (circulation process) of the circular table 101.
- it may be performed before the supply of the second chip 21 as the second electrode member, or may be performed at a different position in the circulation process. Therefore, in the above embodiment, after detecting an eccentric error between the actual position of the central axis C2 of the first chip 11 serving as the first electrode member and the base axis 92 axis C3 of the chuck unit 110 (after the eccentric error detecting step).
- the chuck unit 110 is moved by a predetermined amount and stopped, and when the eccentric error exceeds the allowable range at different stop positions after the detection process, as described above. Then, the position of the chuck 81 may be corrected (center axis position correcting step), that is, the actual position of the center axis C2 of the first chip 11 as the first electrode member may be adjusted to the position of the base shaft 92.
- this position correction center axis position correction process
- this position correction may be performed at a different position as long as it is before the second chip supply process which is the first electrode member supply process.
- each process is performed at the position of 6 has been described, but among the above processes, the process of supplying the first chip 11 to the chuck 81 (first electrode member holding process), the process of the first chip 11
- the five steps from the eccentricity error detection step, the center axis position correction step, the second tip supply step (first electrode member supply step), and the temporary welding step are performed separately at the first to fifth positions.
- the three processes of the welding process, the appearance inspection process, and the discharge process may be stopped at intervals of 45 degrees and performed at 8 positions, respectively, as performed at the 6th to 8th three positions. .
- the appearance inspection process can be performed separately after the composite chip discharging process after the main welding, or the discharging can be performed at the position where the main welding is performed.
- the temporary welding and the main welding may be performed simultaneously at the fourth position P4 in the above example without performing such a temporary welding, or the main welding may be performed directly. Welding can also be performed. Furthermore, this welding can also be performed using, for example, two laser welding apparatuses. In such a case, the chuck unit 110 can be rotated about half or less around the base shaft 92.
- the present invention is not limited to the contents described above, and can be embodied with appropriate modifications without departing from the gist of the present invention.
- the circular moving means is not limited to this.
- the manufactured electrode composite is the above-described composite chip
- either the center electrode or the ground side electrode of the spark plug may be formed.
- the center electrode 71 or the ground electrode 61 in the spark plug 41 as shown in FIG. 11 is configured, whereby a high-performance spark plug is obtained. That is, for example, the ground-side electrode is welded to the ground-side electrode body 60 via the first tip 11 so that the second tip constituting the composite tip 31 that is the composite for electrode is positioned on the spark gap side. Is formed.
- the composite for electrode to be manufactured is the composite chip 31 shown in the right figure (B) of FIG. 10 is described.
- the composite is manufactured according to the present invention.
- the electrode composite to be used is not limited to such a composite chip 31. That is, the electrode composite is the entire center electrode 71 of the spark plug 41 as shown in FIG. 11, the first electrode member is the center electrode body 70, and the second electrode member is the tip of the center electrode body 70. It may be an electrode tip 77 to be welded. Also in the manufacture of the center electrode 71 itself, as shown in FIG.
- the center electrode main body 70 which is a shaft member is chucked by using the same apparatus and the chuck unit 110 as described above, and this tip This is because an electrode tip (corresponding to the noble metal tip in the above-described embodiment) 77 is supplied to 72 and positioned, and the manufacturing process can be performed through the same steps as described above.
- the chuck 81 constituting the chuck unit 110, and its The claw 83 may be formed in a shape and structure that can appropriately hold the center electrode body 70 that is the first electrode member shown in FIG. Then, after the center electrode body 70 is held by the claw 83 of the chuck 81, the end surface of the electrode tip 77 as the second electrode member is concentric with the end surface (tip surface) 72 of the center electrode body 70.
- both electrode members constituting the electrode composite are different from the composite chip in the above example, such as being able to be supplied and arranged so as to be in contact with each other, the same steps as in the above embodiment are performed. It is clear that the same effect can be obtained.
- the center electrode main body 70 as the first electrode member constituting the composite is relatively different from the first chip 11 in the above-described embodiment. Thick and long.
- the center electrode main body 70 has a circular shaft portion (circular shaft portion having the same diameter) 73 as a base, and is coaxial with a rear end (lower end in the drawing) 75 portion. It has a circular flange 76 projecting outward. In such a case, as shown in FIG.
- the chuck 81 drives the chuck 81 so that an intermediate portion (outer peripheral surface) of the circular shaft portion 73 at a portion closer to the tip than the circular flange 76 in the center electrode body 70 is driven. It should be possible to hold it.
- the chuck 81 in FIG. 9 is formed such that the claw 83 can accommodate a portion near the rear end of the circular shaft portion 73 including the circular flange 76 of the center electrode body 70.
- the electrode tip 77 that is the second electrode member is a cylindrical body having an outer diameter that is slightly smaller than the outer diameter of the tip 72 of the center electrode body 70 that is the first electrode member.
- the electrode tip 77 is supplied and arranged so that the end face thereof is coaxially (concentrically) in contact with the tip (tip face) 72 of the center electrode body 70, and then welded along the outer periphery of the joint face. It is set to be.
- the electrode composite of the present invention is not limited to these, and an electrode for a spark plug is formed. Therefore, it can be widely applied to electrode composites. That is, the electrode composite according to the present invention can be widely applied to the manufacture of an electrode for a spark plug in which a first electrode member and a second electrode member are joined by laser welding. In any of these manufactures, the same apparatus as described above is used, the first electrode member is chucked, the second electrode member is supplied to the tip, and the positioning is arranged. This is because the production is performed through the same steps as those described above, and therefore the same effects as described above can be obtained through the above steps.
- the electrode composite is, for example, a portion instead of the entire center electrode, and the first electrode member and the second electrode member are welded to form a portion of the center electrode (for example, not the entire center electrode). It may be a constituent member of the center electrode forming a portion including the tip.
- the manufactured electrode composite is a composite chip
- the first electrode member is a first chip (chip body)
- the second electrode member is a second chip.
- the case of a chip (noble metal chip) is illustrated.
- the electrode composite can also be applied to the center electrode or the like as long as it is an electrode composite for forming an electrode for a spark plug.
- this is used as an electrode composite (for example, a center electrode), and instead of the first tip, this is a first electrode member (for example, a center electrode main body).
- the second electrode member for example, an electrode chip made of a noble metal chip or the like
- the second electrode member can be used.
- a method of manufacturing a composite tip for forming an electrode for a spark plug which is formed by welding a first tip that is a tip body and a second tip that is a noble metal tip, A spark plug including a step of positioning so that both end faces of the first chip and the second chip are in contact with each other, and a laser welding process of welding the outer peripheral edges of the both end faces in contact with the first chip and the second chip.
- a manufacturing apparatus used in the method includes a chuck having a plurality of chuck claws capable of holding a first chip, a chuck position adjusting unit that supports the chuck and can adjust the position of a reference central axis of the chuck, A plurality of chuck units each including a base for supporting the chuck position adjusting means, and the base in each chuck unit is coaxial with a reference central axis of the chuck or the chuck position adjusting means.
- a base axis that can be coaxial with the reference central axis of the chuck by adjusting
- Each chuck unit orbits on a predetermined track, and is disposed at a predetermined position of a circular moving means controlled so as to stop at least at a position where each step is performed via the base shaft.
- each chuck unit is configured to be rotatable about the axis of the base shaft as a rotation center at least at a position where the laser welding process is performed, After driving the circular movement means, the first chip is supplied to and held by the chuck of the chuck unit at the start position of the process, and then the circular movement means is driven to hold the first chip.
- the position of the actual center axis of the first chip held by the chuck is measured by image processing, and the position of the actual center axis of the first chip and the base axis of the chuck unit are measured.
- Detect eccentricity error When the eccentric error exceeds an allowable range, the chuck position adjusting means is driven to correct the position of the chuck so that the actual center axis position of the first chip is changed to the position of the base axis. After that, after driving the circular movement means, the chuck unit is moved by a predetermined amount and stopped, The second chip is supplied at the stop position, and positioned so that both end faces of the first chip and the second chip are in contact with each other.
- the chuck unit in which the second chip is positioned and arranged on the first chip is rotated about the axis of the base shaft as the rotation center, and the outer peripheral edges of the both end surfaces where the first chip and the second chip are in contact are laser-welded. It is characterized by doing.
- Another embodiment 2 is the above-mentioned another embodiment 1, Measuring the position of the actual central axis of the first chip held by the chuck by image processing, and detecting an eccentric error between the actual central axis position of the first chip and the base axis of the chuck unit; When the eccentric error exceeds an allowable range, the chuck position adjusting means is driven to correct the position of the chuck so that the actual center axis position of the first chip is changed to the position of the base axis.
- Another embodiment 3 is the above-described another embodiment 1 or 2, Supplying the second chip, positioning so that both end faces of the first chip and the second chip are in contact, Thereafter, the chuck unit in which the second chip is positioned and arranged on the first chip is rotated about the axis of the base shaft as the rotation center, and the outer peripheral edges of the both end surfaces where the first chip and the second chip are in contact are laser-welded.
- the chuck unit is moved by a predetermined amount, and stopped.
- the spark is characterized in that, at the stop position, the chuck unit is rotated about the axis of the base shaft as a rotation center, and the outer peripheral edges of the both end faces where the first chip and the second chip are in contact are laser-welded. It is the manufacturing method of the composite chip
- Another embodiment 4 is characterized in that the orbiting movement means is configured to intermittently move each chuck unit by a predetermined amount at regular angular intervals along a fixed circular orbit. 4.
- First chip (first electrode member) 13 End surface 21 of first chip Second chip (second electrode member) 23 End surface 31 of second chip Composite chip (composite for electrode) 41 Spark plug 70 Central electrode body (first electrode member) 71 Center electrode (electrode composite) 77 Tip for electrode (second electrode member) 81 Chuck 83 Chuck claw 90 Chuck position adjusting means 92 Base shaft 101 Circular table (circular movement means) 103 Predetermined trajectory (virtual circle) 110 Chuck unit 120 Base C1 supporting the chuck position adjusting means Reference center axis C2 of the chuck Actual center axis C3 of the first chip held by the chuck Base axis P1 Process start position Z Eccentric error
Abstract
Description
前記第1電極部材を、チャックユニットのチャックに保持させる第1電極部材保持工程と、
前記第2電極部材をその端面が前記第1電極部材の端面に接するように供給する第2電極部材供給工程と、
前記第1電極部材と前記第2電極部材とが接する両端面の外周縁を溶接するレーザ溶接工程とを含む、スパークプラグ用の電極を形成するための電極用複合体の製造方法において、
前記第1電極部材保持工程の後、第2電極部材供給工程の前に、
前記第1電極部材の実際の中心軸の位置と、前記チャックユニットを構成する前記チャックを回転可能に支持する基台の基軸との偏心誤差を検出する偏心誤差検出工程を有しており、
該偏心誤差検出工程の後においてその偏心誤差が許容範囲を超えている場合に、前記第1電極部材の実際の中心軸を、前記基台の基軸の軸線にあわせ込む補正をする第1電極部材の中心軸位置補正工程を備えていることを特徴とする。
前記第1電極部材と前記第2電極部材とが接する両端面の外周縁を仮溶接する仮溶接工程を含んでいることを特徴とする、請求項1に記載のスパークプラグ用の電極を形成するための電極用複合体の製造方法である。
前記偏心誤差検出工程と前記中心軸位置補正工程とが、その周回過程における同じ位置で行われることを特徴とする、請求項1又は2のいずれか1項に記載のスパークプラグ用の電極を形成するための電極用複合体の製造方法である。
前記第1電極部材保持工程と前記偏心誤差検出工程とが、その周回過程における異なる位置で行われることを特徴とする、請求項1~3のいずれか1項に記載のスパークプラグ用の電極を形成するための電極用複合体の製造方法である。
前記中心電極又は該接地側電極が、第1電極部材と第2電極部材とが接合されてなる電極用複合体、又は該電極用複合体が接合されてなるものであるスパークプラグの製造方法において、
前記電極用複合体が、請求項1~4のいずれか1項に記載の製造方法によって製造されたものであることを特徴とするスパークプラグの製造方法である。
チップ本体である第1チップと、貴金属チップである第2チップとを溶接してなる、スパークプラグ用の電極を形成するための複合チップの製造方法であって、
第1チップと第2チップとの両者の端面が接するように位置決めする工程と、第1チップと第2チップとが接する前記両端面の外周縁を溶接するレーザ溶接工程とを含む、スパークプラグ用の電極を形成するための複合チップの製造方法において、
その方法に使用する製造装置は、第1チップを保持可能の複数のチャック爪を備えたチャックと、このチャックを支持し、このチャックの基準中心軸の位置を調節可能のチャック位置調節手段と、該チャック位置調節手段を支持する基台と、を含んでなるチャックユニットを複数備えていると共に、該各チャックユニットにおける前記基台は、前記チャックの基準中心軸と同軸、又は前記チャック位置調節手段によって調節することで該チャックの基準中心軸と同軸とし得る基軸を有しており、
この各チャックユニットは、所定の軌道上を周回し、少なくとも、前記各工程を行う位置において停止するように制御される周回移動手段のうちの所定の位置に、前記基軸を介して配置されており、しかも、各チャックユニットは、少なくとも、上記レーザ溶接工程を行う位置において、前記基軸の軸線を回転中心として回転可能に構成されており、
前記周回移動手段を駆動した後、工程の開始位置にあるチャックユニットのチャックに、第1チップを供給して保持させ、その後、前記周回移動手段を駆動し、この第1チップを保持したチャックユニットを所定量、移動して停止させ、
その停止位置において、そのチャックに保持された第1チップの実際の中心軸の位置を画像処理により測定すると共に、この第1チップの実際の中心軸の位置と、該チャックユニットの前記基軸との偏心誤差を検出し、
その偏心誤差が許容範囲を超えている場合に、前記チャック位置調節手段を駆動して、前記チャックの位置の補正を行うことで、第1チップの実際の中心軸の位置を、前記基軸の位置にあわせ込み、その後、前記周回移動手段を駆動して該チャックユニットを所定量、移動して停止させ、
その停止位置において第2チップを供給して、第1チップと第2チップとの両者の端面が接するように位置決めし、
その後、この第1チップに第2チップが位置決め配置されたチャックユニットを、前記基軸の軸線を回転中心として回転させて、第1チップと第2チップとが接する前記両端面の外周縁をレーザ溶接することを特徴とする。
別形態例2は、上記別形態例1において、
チャックに保持された第1チップの実際の中心軸の位置を画像処理により測定すると共に、この第1チップの実際の中心軸の位置と、該チャックユニットの前記基軸との偏心誤差を検出し、
その偏心誤差が許容範囲を超えている場合に、前記チャック位置調節手段を駆動して、前記チャックの位置の補正を行うことで、第1チップの実際の中心軸の位置を、前記基軸の位置にあわせ込み、その後、前記周回移動手段を駆動して該チャックユニットを所定量、移動して停止させ、たことに代えて、
チャックに保持された第1チップの実際の中心軸の位置を画像処理により測定すると共に、この第1チップの実際の中心軸の位置と、該チャックユニットの前記基軸との偏心誤差を検出し、その後、前記周回移動手段を駆動し、該チャックユニットを所定量、移動して停止させ、
その停止位置において、その偏心誤差が許容範囲を超えている場合に、前記チャック位置調節手段を駆動して、前記チャックの位置の補正を行うことで、第1チップの実際の中心軸の位置を、前記基軸の位置にあわせ込み、その後、前記周回移動手段を駆動して該チャックユニットを所定量、移動して停止させ、たことを特徴とする、スパークプラグ用の電極を形成するための複合チップの製造方法である。
別形態例3は、上記別形態例1又は2において、
第2チップを供給して、第1チップと第2チップとの両者の端面が接するように位置決めし、
その後、この第1チップに第2チップが位置決め配置されたチャックユニットを、前記基軸の軸線を回転中心として回転させて、第1チップと第2チップとが接する前記両端面の外周縁をレーザ溶接すること、に代えて、
第2チップを供給して、第1チップと第2チップとの両者の端面が接するように位置決めし、
その後、この第1チップと第2チップとが接する前記両端面の外周縁をレーザ溶接により仮溶接し、その後、前記周回移動手段を駆動し、該チャックユニットを所定量、移動して停止させ、
その停止位置において、該チャックユニットを、前記基軸の軸線を回転中心として回転させて、第1チップと第2チップとが接する前記両端面の外周縁をレーザ溶接すること、を特徴とする、スパークプラグ用の電極を形成するための複合チップの製造方法である。
別形態例4は、前記周回移動手段が、各チャックユニットを一定の円軌道上に沿って等角度間隔で所定量ずつ間欠的に移動する構成のものであることを特徴とする上記別形態例1~3のいずれか1に記載の、スパークプラグ用の電極を形成するための複合チップの製造方法である。
13 第1チップの端面
21 第2チップ(第2電極部材)
23 第2チップの端面
31 複合チップ(電極用複合体)
41 スパークプラグ
70 中心電極本体(第1電極部材)
71 中心電極(電極用複合体)
77 電極用チップ(第2電極部材)
81 チャック
83 チャック爪
90 チャック位置調節手段
92 基軸
101 円形テーブル(周回移動手段)
103 所定の軌道(仮想円)
110 チャックユニット
120 チャック位置調節手段を支持する基台
C1 チャックの基準中心軸
C2 チャックに保持された第1チップの実際の中心軸
C3 基軸の軸線
P1 工程の開始位置
Z 偏心誤差
Claims (5)
- 第1電極部材と、第2電極部材とがレーザ溶接によって接合されてなる、スパークプラグ用の電極を形成するための電極用複合体の製造方法であって、
前記第1電極部材を、チャックユニットのチャックに保持させる第1電極部材保持工程と、
前記第2電極部材をその端面が前記第1電極部材の端面に接するように供給する第2電極部材供給工程と、
前記第1電極部材と前記第2電極部材とが接する両端面の外周縁を溶接するレーザ溶接工程とを含む、スパークプラグ用の電極を形成するための電極用複合体の製造方法において、
前記第1電極部材保持工程の後、第2電極部材供給工程の前に、
前記第1電極部材の実際の中心軸の位置と、前記チャックユニットを構成する前記チャックを回転可能に支持する基台の基軸との偏心誤差を検出する偏心誤差検出工程を有しており、
該偏心誤差検出工程の後においてその偏心誤差が許容範囲を超えている場合に、前記第1電極部材の実際の中心軸を、前記基台の基軸の軸線にあわせ込む補正をする第1電極部材の中心軸位置補正工程を備えていることを特徴とする、スパークプラグ用の電極を形成するための電極用複合体の製造方法。 - 前記第2電極部材供給工程の後、前記レーザ溶接の前に、
前記第1電極部材と前記第2電極部材とが接する両端面の外周縁を仮溶接する仮溶接工程を含んでいることを特徴とする、請求項1に記載のスパークプラグ用の電極を形成するための電極用複合体の製造方法。 - 前記チャックユニットは、周回する周回移動手段にその周回に伴って、順次、移動するように複数、配置されており、
前記偏心誤差検出工程と前記中心軸位置補正工程とが、その周回過程における同じ位置で行われることを特徴とする、請求項1又は2のいずれか1項に記載のスパークプラグ用の電極を形成するための電極用複合体の製造方法。 - 前記チャックユニットは、周回する周回移動手段にその周回に伴って、順次、移動するように複数、配置されており、
前記第1電極部材保持工程と前記偏心誤差検出工程とが、その周回過程における異なる位置で行われることを特徴とする、請求項1~3のいずれか1項に記載のスパークプラグ用の電極を形成するための電極用複合体の製造方法である。 - 軸線方向に軸孔を有する絶縁体と、この軸孔の先端側に配置された中心電極と、前記絶縁体の周囲を取り囲む主体金具と、一端が前記主体金具に接合され、他端が前記中心電極の先端に対向するように設けられた接地側電極とを有し、
前記中心電極又は該接地側電極が、第1電極部材と第2電極部材とが接合されてなる電極用複合体、又は該電極用複合体が接合されてなるものであるスパークプラグの製造方法において、
前記電極用複合体が、請求項1~4のいずれか1項に記載の製造方法によって製造されたものであることを特徴とするスパークプラグの製造方法。
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CN201180036003.5A CN103026562B (zh) | 2010-09-24 | 2011-09-20 | 用于形成火花塞用的电极的电极用复合体的制造方法及火花塞的制造方法 |
EP11826826.7A EP2621034B1 (en) | 2010-09-24 | 2011-09-20 | Method of manufacturing electrode complex for forming electrode of spark-plug, and method of manufacturing spark plug |
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JP2018120808A (ja) * | 2017-01-27 | 2018-08-02 | 日本特殊陶業株式会社 | 点火プラグの製造方法 |
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