CN103904561B - Bending device - Google Patents
Bending device Download PDFInfo
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- CN103904561B CN103904561B CN201210585883.8A CN201210585883A CN103904561B CN 103904561 B CN103904561 B CN 103904561B CN 201210585883 A CN201210585883 A CN 201210585883A CN 103904561 B CN103904561 B CN 103904561B
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Abstract
The invention provides a bending device comprising a frame, and a profile and a bent portion forming component which are arranged on the frame. The bending device further comprises a driving component, a first stroke component and a second stroke component. The first stroke component is arranged on the frame, moves along the frame from an initial position under the action of the driving component, and enables the profile associated therewith to be switched to a working position after moving by a predetermined distance. The second stroke component is arranged on the frame and includes a motion unit and a motion transformation unit, wherein the motion unit starts to move when the first stroke component moves by the predetermined distance from the initial position, and the motion transformation unit transforms movement of the motion unit into curve motion so as to drive the bent portion forming component associated with the motion transformation unit to act.
Description
Technical field
The present invention relates to the strip bending device of the earth electrode of bending device, more particularly, to spark plug.
Background technology
The spark plug that automobile engine is used generally comprises the central electrode extending along spark plug axis direction, in being located at
Insulator outside heart electrode, by insulator be wrapped in cylindrical metallic shell and end engage the leading section of this metal-back
Earth electrode.Earth electrode is configured to terminal surface to central electrode, thus limits between central electrode and earth electrode
Spark-discharge gap.
Need special purpose device that earth electrode is bent to required form, this kind of device generally include by earth electrode not with shell
The turn of bilge molded component of the end bending that body connects, prevents the pattern of earth electrode deformation during bending, drives turn of bilge to become
The part that shape part runs, drives the part that pattern runs, and for supported grounding electrode to carry out bending the part of operation
Deng.Publication No. CN10216024A, China's patent Shen of entitled " manufacture method of spark plug and the manufacture device of spark plug "
Please disclose a kind of spark plug manufacture device being related to turn of bilge molded component and pattern.
Content of the invention
The present invention provides a kind of bending device, and it includes frame, is arranged at pattern and the turn of bilge molded component of this frame, this
Outward, this bending device also includes：Driver part；First stroke part, it is arranged in frame and in described driver part
Under effect, from initial position along described machine frame movement, after mobile preset distance, that is, make described pattern conversion associated with it
To operating position；Second stroke part, it is arranged in described frame and includes：Moving cell, described moving cell is described
First stroke part after its initial position starts mobile preset distance, that is, starts to move, motion transforming unit, and it is by described the
The movement of one moving cell is converted to curvilinear motion, thus driving the described turn of bilge molded component associating with this motion transforming unit
Action.
By setting spacing distance between the initial position of the first stroke part and the second stroke part so that driving
Under the direct action of part, the first stroke part and the second stroke part can successively be advanced, so that being associated with the first stroke
The pattern of part is first transformed into operating position subsequent turn of bilge molded component and carries out bending operation.
Brief description
Fig. 1 a is an exemplary diagram of spark plug.
Fig. 1 b is the schematic diagram that earth electrode for example passes through after bending device bending of the present invention.
Fig. 2 is the structural representation of the bending device according to an embodiment of the invention.
Fig. 3 is the schematic perspective view of the bending device according to a specific embodiment of the present invention.
Fig. 3 a is the schematic cross-section of bending device part-structure shown in Fig. 3；Fig. 3 b is that structure shown in Fig. 3 a is single first
The end 261d of unit 261 has travelled through interval 80 and has touched state during moving cell 281；Fig. 3 c illustrates turn of bilge and shapes
The thin portion of part 24.
Fig. 4 is the alternative structure of structure shown in Fig. 3 a.
Specific embodiment
Referring now to the schematic example of the Description of Drawings present invention, identical drawing reference numeral represents identical element.Hereafter
Each embodiment of description contributes to those skilled in the art and thoroughly understands the present invention, and is intended to example and unrestricted.The each unit of in figure
The diagram of part, part, module, device and apparatus body is not drawn necessarily to scale, only illustrate schematically these elements, part,
Relativeness between module, device and apparatus body.
In all examples of this paper, all illustrated as an example with bending device bending spark plug, but not with this
It is limited, the bending device of example shown here can also be used for bending other parts needing bending.
Fig. 1 a is an exemplary diagram of spark plug.Spark plug includes the central electrode extending along spark plug axis direction
10, the insulator (not shown) being located at outside central electrode 10 is wrapped in interior metal-back 11, one end is connected to metal-back 11
Earth electrode 12.In the following description, one end that earth electrode 12 is connected with metal-back 11 is referred to as cardinal extremity and the other end is claimed
For end.Fig. 1 b is the schematic diagram that earth electrode for example passes through after spark plug bending device bending of the present invention.
Fig. 2 is the structural representation of the bending device according to an embodiment of the invention.This bending device includes machine
Frame 20, pattern 22, turn of bilge molded component 24, the first stroke part 26, the second stroke part 28, elastomeric element 30 and driver part
32.
In conjunction with Fig. 1, when bending earth electrode 12, between the centrally disposed electrode 10 of pattern 22 and earth electrode 12, with
Just earth electrode 12 is made to form desired shape during bending.In all examples herein, pattern 22 during bending
Location is referred to as operating position.In this example, pattern 22 is arranged at frame 20 and is associated with the first stroke part 26.
First stroke part 26 is arranged in frame 20 in the way of can moving along a straight line.In the presence of driver part 32,
First stroke part 26 can start along machine frame movement from initial position, and when moving preset distance, makes associated with it
Pattern 22 is transformed into operating position.
Exemplarily, the first stroke part 26 is associated with pattern 22 by elastomeric element 30.One end of elastomeric element 30
Portion can be fixedly installed in frame 20, and when the first stroke part 26 is located at initial position, elastomeric element 30 is in by compression shape
State, with the movement of the first stroke part 26, it discharges from confined state, loose scalable by this elastomeric element 30
End is stretched out.Pattern 22 is arranged in front of the expansion end of elastomeric element 30, and therefore expansion end acts on during it stretches out
Pattern 22 is so as to change to operating position from home position, according to the invention it is preferred to pattern 22 is fixedly connected on elastomeric element
30.Exemplary configuration elastomeric element 30, pattern 22 and first stroke part 26 between is described in detail below.Art technology
Personnel can modify to this exemplary configuration as needed, only need to reach the first stroke part 26 in traveling preset distance,
Pattern 22 is made to be transformed into the function of operating position.
Turn of bilge molded component 24 is arranged in frame 20, during it is towards earth electrode 12 rotation, it will force
In earth electrode 12, so that the end of electrode 12 bends towards central electrode 10.Turn of bilge molded component 24 is by the second stroke portion
Part 28 drives.
According to the example of the present invention, the second stroke part 28 is arranged in frame 20, and includes moving cell and motion turn
Change unit.Moving cell is associated with the first stroke part 26 in the way of can moving along a straight line, and specifically, moving cell is first
Stroke part 26, from the beginning of its initial position, after moving preset distance, that is, starts to move.According to the present invention one is specifically real
Apply example, the moving cell of the second stroke part 28 is initial in frame with the first stroke part 26 in the initial position in frame
There is between position preset distance, and the setting in frame of moving cell and the first stroke part 26 makes the first stroke portion
Part 26 after travelling preset distance from initial position, that is, touches and and then promotes this moving cell to move.Motion conversion is single
The motion of moving cell is converted to curvilinear motion by unit, thus drives turn of bilge molded component 24 to carry out bending operation.
According to one embodiment of present invention, this bending device may also include driver part 32.Driver part 32 can be made
For the first stroke part 26 so that the first stroke part 26 is mobile.In conjunction with mentioned above, driver part 32 is acting on
After first stroke part 26, the first stroke part 26 i.e. along machine frame movement, after moving preset distance, that is, so that closing with it
The pattern 22 of connection is located between central electrode and earth electrode, subsequently also promotes the moving cell of the second stroke part 28 to move,
This movement is converted to the bending of bending molded component 24 by motion transforming unit, thus earth electrode backfin is become desired shape
Shape.
It can be seen that, driver part 32 applies once to drive, and just makes two stroke parts it is anticipated that successively moving, and then makes to lean on
The relevant position that mould 22 first snaps in spark plug first makes pattern 22 be converted to operating position, even and if after it proceeds to operating position
Turn of bilge molded component 24 starts bending operation.The setting of preset distance need to make the first stroke part 26 move within this time period
Dynamic, associated pattern 20 just can be made to transform to operating position from its initial position.
It is understood that in all examples herein, during bending device bending spark plug ground electrode, Ying Youzhi
Spark plug has been supported and has fixed to wait to bend by support arrangement (such as fixture etc.), and bending device itself be also set to suitable
Position in operation.Additionally, in the example of this paper, more than one part, element or device are arranged at frame 20, but this is not
Show that these parts, element or device are arranged on the same position of frame 20.As one of skill in the art will understand that
Sample, these parts, element or device are arranged on the appropriate location of frame 20 to be conducive to their work, and these positions may phase
With being likely to difference, not homonymy in frame may be likely in the homonymy of frame it is contemplated that frame 20 itself non-invention
Emphasis, for brevity, is not specifically described to it herein.
Fig. 3 is the schematic perspective view of bending device according to an embodiment of the invention.In this embodiment, bending device
Driver part 32 is cylinder, and hereinafter driver part 32 and cylinder 32 are used interchangeably.The piston rod (sign) of cylinder 32 leads to
Cross connector 302 to be connected with the first stroke part 26, this connector 302 can be floating junction.
First stroke part 26 includes the first module (first module 261 referring in Fig. 3 a) being arranged in frame and
Two units 262, in this example, can be arranged on frame by rectilinear motion mode, that is, first module can make straight line along frame to first module
Motion.Fig. 3 a is the schematic cross-section of bending device part-structure shown in Fig. 3.As shown in Figure 3 a, an end of first module 261
Portion 261a is connected with the piston rod of cylinder 32 by connector 302.Return to Fig. 3, at the other end 261b of first module 261 (see
Fig. 3 a) it is fixedly connected the Part I 2621 of second unit 262, fixed form is, for example, that screw is fixed.The of second unit 262
Two parts 2622 are for example passed through screw vertically and are fixed on Part I 2621.Example and without limitation, Part I 2621
Middle body can hollow out so that as needed change turn of bilge molded component in pressure contact portion (being described below).
Part II 2622 is included the arcwall face being connected with the first plane by the first plane and is connected with this arcwall face
The chain of command that second plane is constituted, can control elastomeric element by the cooperation of this chain of command and elastomeric element.Elastomeric element 30
Including with moving cell 301 and Flexible element (not shown).Wherein, Flexible element is, for example, spring, an end of this spring (under
Claim fixing end) it is fixed on frame and the other end (calling expansion end in the following text) is scalable；Base portion with moving cell 301 is (or referred to as servo-actuated
The Part I of unit 301) be arranged on spring expansion end before, with moving cell 301 from for loading and being relatively fixed elastic portion
Projection that the housing 70 (this housing 70 is a part for frame) of part protrudes (or it is referred to as second with moving cell 301
Point), it is close to chain of command.As a specific example, Part II 2622 includes extending from Part II body 2622-1
Transition body 2622-2, chain of command is formed at that side of this transition body 2622-2 dorsad Part II body 2622-1.As figure
Shown, chain of command includes the first plane 2622a, and (arcwall face 2622b is the arcwall face 2622b being connected with the first plane 2622a
Second plane), and be changed into, from this arcwall face, the 3rd plane 2622c being connected with this arcwall face, its midplane 2622a with flat
Face 2622c is parallel.In the original state of the first stroke part 26, plane 2622a keeps out elastomeric element 30 so as to can not act on
Pattern.
In embodiment shown in Fig. 3, elastomeric element 30 be resisted against plane 2622a with moving cell 301.Do not illustrate in Fig. 3
Flexible element and pattern, do not illustrate with the configuration relation between moving cell 301, Flexible element and pattern, here is only with example yet
Form these parts and its configuration relation are illustrated.
Flexible element and pattern are arranged in housing 70, and Flexible element fixing end is fixed on housing 70, and (fixed position can
Two fixed screw 70a and 70b referring in figure).When the first stroke part 26 is in original state, Flexible element be in by
Compressive state, and the base portion with moving cell 301 abutted with the expansion end of Flexible element thus stoping this telescopic end from stretching out.According to
One example, pattern is fixedly connected on the side of this base portion with moving cell 301, and this side abuts that of Flexible element with this base portion
Side is relatively.When the first stroke part 26 is under the once promotion of driver part 32 piston rod, move along frame straight line in x direction
When dynamic, plane 2622a moves simultaneously, therefore moves to arcwall face in the presence of the Flexible element being compressed with moving cell 301
2622b, is released along along direction y by this pattern, until moving to plane 2622c with moving cell 301 from arcwall face 2622b,
Now, pattern is also converted to operating position just.It is appreciated that in this example, Flexible element is configured such that until flexible
End is still in compressive state because moving to moving cell 301 during plane 2622c, simply compression degree now is stretched than telescopic end
Before going out lightly.Furthermore, it is to be understood that the central angle of arcwall face 2622b can be set to 45 degree.
Referring to Fig. 3 a, the second stroke part is arranged in frame, and it includes moving cell 281 and motion transforming unit 282.
Moving cell 281 is associated with the first stroke part 26, more specifically, being associated with the first module 261 of the first stroke part 26.This
In example, generally in matrix, connecting shaft 200 is for example screwed in two of first module 261 protrusion to first module 261
On 261c and 261d of end.Moving cell 281 includes bar shaped portion (non-label) and the tooth-like part extending from bar shaped portion side
2812.It is provided with through hole along this bar shaped portion length direction in bar shaped portion, connecting shaft 200 passes through this through hole.Can connect
Two ends that axle 200 is contacted with through hole, are respectively provided with bushing, to prevent the abrasion between connecting shaft 200 and through hole.
Being partly substantially all contained in the recess of first module 261 beyond moving cell tooth-like part.Two of moving cell 281
Between end 261c and 261d that end 281c and 281d is protruded with corresponding first module 261 respectively, there is interval.In motion
There is the interval 80 of preset distance, in moving cell between the end 281d of unit 281 and the end 261d of first module 261
Have between 281 end 281c and the end 261c of first module 261 to be spaced and be provided with that interval to be in and compressed
Elastic component 40 (it is, for example, spring), setting at the end 281d of moving cell 281 is fixed on stopper section 50 in frame.
Motion transforming unit 282 is gear, and it is engaged to the tooth-like part 2812 of moving cell 281, thus passing through their engagements each other
And the motion of moving cell 281 is converted to the rotary motion of gear.Motion transforming unit 282 is connected with turn of bilge molded component,
Thus driving its rotation.Here is noted that the bar shaped portion constituting moving cell 281 and the tooth-like part extending from it can
To be integrally formed.
When the first stroke part 26 remains static, stop portion 50 and the elastic component 40 being compressed stop the second stroke
The moving cell 281 of part 28 produces and moves.After driver part 32 drives first module 261 mobile by its piston rod, place
Having been alleviated by the confined state of compression elastic piece between first module 261 end 261c and moving cell 281 end,
But it is still in confined state, thus, moving cell 281 is still relatively fixed between stop portion 50 and elastic component 40,
It should be noted that according to the example of the present invention, carrying out this elastic component 40 in the whole process bend operation in bending device equal
It is in confined state, be simply varied from by compression degree.Move preset distance in first module 261, that is, first is single
The end 261d of unit 261 has travelled through after interval 80 touches moving cell 281, the first module 261 that continues to move to
Moving cell 281 will be promoted mobile.Fig. 3 b is structure shown in Fig. 3 a between the end 261d of first module 261 has travelled through
State when 80 touch moving cell 281.As illustrated, now, originally in the end 281d and first of moving cell 281
Between the end 261d of unit 261, the interval of preset distance has been converted between 281c and 261c of end.
Fig. 4 is the distressed structure of structure shown in Fig. 3 a.In the structure shown here, being used for being relatively fixed moving cell 281 is elasticity
Part 42 is fixing by the first component 420 being fixed in bar shaped portion and the second component 421 being fixed in frame.With elastic component 40
Similar, carry out this elastic component 42 in the whole process bend operation in bending device and be in confined state, simply compressed
Degree is varied from.According to the present invention, moving cell 281 is associated with first module 261 by connecting shaft 200, given herein
In example, connecting shaft 200 passes through the hole in moving cell 281 bar shaped portion, thus achieves moving cell 281 and first module
261 association.It is also possible to alternate manner constitutes associating of moving cell 281 and first module 261 in being embodied as, only need reality
First module 261 just can drive mobile unit 281 mobile after the mobile scheduled time now.For example, can be the two of bar shaped portion
Individual end arranges two parts being fixed on bar shaped portion towards the direction of first module 261, and connecting shaft passes through and is arranged on this two
Just may be used in hole in part.
It should be noted that being only showing of attainable cost spirit with reference to each part shown in this example and its matching relationship
Example property structure, those skilled in the art can modify according to it, change to reach same effect, but these modifications and changes according to
So within the right that the present invention is advocated.
Fig. 3 c illustrates the thin portion of turn of bilge molded component 24.As illustrated, turn of bilge molded component 24 includes being fixedly attached to
The connecting portion 241 of motion transforming unit 282 and the pressure contact portion 242 being fixedly connected on this connecting portion 241.Pressure contact portion 242 is for example logical
Cross screw and be fixed on connecting portion 241.Pressure contact portion 242 contacts face 242a, its shape and this electrode to be formed of earth electrode
Form fit.
Return to Fig. 3, in combination with Fig. 3 a and Fig. 3 c, illustrate the operation of described crimp.The piston of cylinder 32 promotes the
The first module 261 of one stroke part 26, first module 261 along machine frame movement, drives simultaneously and is fixed on the of first module 261
Two units 262 move together.In this moving process, elastomeric element 30 with moving cell 301 in the Flexible element being compressed
Under effect, gradually transform to against the second plane 2622b from the first plane 2622a being resisted against chain of command, in the process, push away
Dynamic be fixed on its pattern and stretch out, hence into operating position, that is, snap onto between earth electrode 12 and central electrode 10 (see
Fig. 1).When first module 261 moves spacing distance 80, the end 261d of first module touches the second stroke part 28
The end 281d of moving cell 281, at this moment, enters into the 3rd plane from the second plane 2622b just with moving cell 301
2622c, thus no longer there is the movement along y direction.With moving cell 301 by this backstop live Flexible element continue move ahead, pattern
Will not promoted positioned at operating position.
With the continuing to move to of first module 261 of the first stroke part 26, the moving cell 281 of the second stroke part 28
Promoted, the motion transforming unit 282 that is moved through of moving cell 281 is converted into rotary motion, drives and motion transforming unit
282 crimps being fixedly connected are towards the direction motion of earth electrode 12.The movement of first module 261 is until crimp 24
Pressure contact portion 242 earth electrode 12 is bent into required form can stop.After bending terminates, the of the first stroke part 26
One unit 261, in the presence of piston rod rightabout, returns initial position, and in this course, pattern is in chain of command 2622
In the presence of, return its initial position from its operating position, the second stroke part 28 is also return just in the presence of elastic component 40
Beginning position, this also makes the crimp 24 being driven by the second stroke part 28 return its initial position.
As described above, according to the present invention so that the promotion to the first stroke part for the piston rod of cylinder, can make as expected
After first stroke part one end time, simultaneously act on the first stroke part and the second stroke part.Acting only on
In the time period of one stroke part, pattern is transformed into operating position, and starts when pattern is transformed into operating position to act on
Second stroke part, and complete the bending operation to spark plug for the bending device by the work of the second stroke part.
Although having combined accompanying drawing in described above, disclose the specific embodiment of the present invention, art technology
Personnel are it is understood that can be deformed to disclosed specific embodiment or changed without departing from the spirit of the invention.
Embodiments of the invention are only used for signal and are not limited to the present invention.
Claims (7)
1. a kind of bending device, including frame, be arranged on pattern in described frame and turn of bilge molded component it is characterised in that
Described bending device also includes：
Driver part；
First stroke part, it is arranged in frame and in the presence of described driver part, from initial position along described frame
Mobile, after mobile preset distance, that is, make described pattern associated with it be transformed into operating position；
Second stroke part, it is arranged in described frame and includes：
Moving cell, described moving cell after described first stroke part starts mobile preset distance from its initial position, that is,
Start to move,
Motion transforming unit, the movement of described moving cell is converted to curvilinear motion by it, thus driving single with this motion conversion
The described turn of bilge molded component action of unit's association；And
Wherein, described bending device also includes：
Elastomeric element, the fixing end of described elastomeric element is fixedly connected with frame, expansion end moves in described first stroke part
During dynamic preset distance, make to be arranged on it from confined state release and stretch out the described pattern in direction and be transformed into described operating position.
2. bending device as claimed in claim 1 is it is characterised in that described first stroke part includes：
First module, it is, after mobile preset distance, to drive the moving cell of the second stroke part in subsequent movement
The mode of movement is connected with this moving cell；
Second unit, it is fixedly attached to described first module and the movement with first module and mobile, described second unit bag
Include：
Part I, is fixedly connected described first module,
Part II, described Part II is fixedly connected on described Part I, and together with described Part I part around
Treat bending member, described Part II is associated with described pattern by described elastomeric element.
3. bending device as claimed in claim 2 it is characterised in that
Described Part II includes abutting thus controlling the chain of command of described elastomeric element for described elastomeric element；
Described elastomeric element includes being fixed on the Flexible element of described frame with moving cell with by fixing end, described with moving cell
The telescopic end of Flexible element described in Part I stop and its Part II abuts described control in the presence of described Flexible element
Face processed；And
Described pattern is arranged on the described side with moving cell Part I, and this side is single with elasticity described in described Part I stop
That side of unit is relatively.
4. bending device as claimed in claim 3 is it is characterised in that described chain of command includes the first plane, with described first
The arcwall face that plane connects, the second plane being connected with this arcwall face, described first plane is parallel with described second plane.
5. bending device as claimed in claim 2 is it is characterised in that described moving cell includes being connected with described first module
Bar shaped portion and the tooth-like part extending from the side in described bar shaped portion；And, described motion transforming unit includes and described tooth
Shape portion meshed gears.
6. bending device as claimed in claim 5 it is characterised in that described first module be female component, described bar shaped portion
It is associated with described first module, described first module by means of the connecting shaft being fixed to two ends that described first module is protruded
After mobile preset distance, described bar shaped portion is driven to move in subsequent movement.
7. the bending device as described in any one in claim 1 to 6 it is characterised in that described driver part be cylinder, institute
The piston rod stating the first stroke part with described cylinder is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210585883.8A CN103904561B (en) | 2012-12-31 | 2012-12-31 | Bending device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210585883.8A CN103904561B (en) | 2012-12-31 | 2012-12-31 | Bending device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103904561A CN103904561A (en) | 2014-07-02 |
| CN103904561B true CN103904561B (en) | 2017-02-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210585883.8A Active CN103904561B (en) | 2012-12-31 | 2012-12-31 | Bending device |
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| Country | Link |
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| CN (1) | CN103904561B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6234956B2 (en) * | 2015-03-31 | 2017-11-22 | 日本特殊陶業株式会社 | Manufacturing method of spark plug |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7581998B2 (en) * | 2005-09-08 | 2009-09-01 | Ngk Spark Plug Co., Ltd. | Method for regulating aground electrode position in spark plug |
| JP4485512B2 (en) * | 2006-12-25 | 2010-06-23 | 日本特殊陶業株式会社 | Spark plug manufacturing method and spark plug manufacturing apparatus |
| CN102160247A (en) * | 2008-10-06 | 2011-08-17 | 日本特殊陶业株式会社 | Method for manufacturing spark plug and device for manufacturing spark plug |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3818250B2 (en) * | 2002-10-22 | 2006-09-06 | 株式会社デンソー | Manufacturing method of spark plug |
-
2012
- 2012-12-31 CN CN201210585883.8A patent/CN103904561B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7581998B2 (en) * | 2005-09-08 | 2009-09-01 | Ngk Spark Plug Co., Ltd. | Method for regulating aground electrode position in spark plug |
| JP4485512B2 (en) * | 2006-12-25 | 2010-06-23 | 日本特殊陶業株式会社 | Spark plug manufacturing method and spark plug manufacturing apparatus |
| CN102160247A (en) * | 2008-10-06 | 2011-08-17 | 日本特殊陶业株式会社 | Method for manufacturing spark plug and device for manufacturing spark plug |
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| Publication number | Publication date |
|---|---|
| CN103904561A (en) | 2014-07-02 |
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