JPH08213150A - Manufacture of composite electrode for spark plug - Google Patents
Manufacture of composite electrode for spark plugInfo
- Publication number
- JPH08213150A JPH08213150A JP2075895A JP2075895A JPH08213150A JP H08213150 A JPH08213150 A JP H08213150A JP 2075895 A JP2075895 A JP 2075895A JP 2075895 A JP2075895 A JP 2075895A JP H08213150 A JPH08213150 A JP H08213150A
- Authority
- JP
- Japan
- Prior art keywords
- composite material
- shaft
- composite
- forming
- extrusion molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、内燃機関の気筒に取
り付けられて対向電極との間で火花放電が発生する点火
栓用複合電極の製造方法に関するもので、特に後端側か
ら先端側に向かって外径が段階的に細径化された点火栓
用複合中心電極または複合側方電極の製造方法に係わ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite electrode for a spark plug which is attached to a cylinder of an internal combustion engine and spark discharge is generated between the electrode and a counter electrode. The present invention relates to a method of manufacturing a composite center electrode or a composite lateral electrode for a spark plug whose outer diameter is gradually reduced toward the outside.
【0002】[0002]
【従来の技術】従来より、複合中心電極は、以下の第1
〜第5工程を行う製造方法(以下従来の製造方法と呼
ぶ)にて製造されている。先ず、耐熱性および耐食性に
優れる第1金属に塑性加工を施すことにより、後端のみ
開口した軸方向穴を有するカップを形成する。さらに、
熱伝導性に優れる第2金属に塑性加工を施すことによ
り、軸方向穴内に挿入可能な円柱部を有する芯材を形成
する。次に、図12(c)に示したように、カップ{図
12(b)参照}の軸方向穴内に、軸芯{図12(a)
参照}の円柱部を挿入することにより一体化して第1複
合材101を形成する第1工程を行う。2. Description of the Related Art Conventionally, a composite center electrode has the following first
-It manufactures by the manufacturing method (henceforth a conventional manufacturing method) which performs a 5th process. First, the first metal having excellent heat resistance and corrosion resistance is subjected to plastic working to form a cup having an axial hole having only a rear end opened. further,
By subjecting the second metal having excellent thermal conductivity to plastic working, a core material having a cylindrical portion that can be inserted into the axial hole is formed. Next, as shown in FIG. 12 (c), the shaft core (FIG. 12 (a)) is placed in the axial hole of the cup {see FIG. 12 (b)}.
The first step of forming the first composite material 101 is performed by inserting the cylindrical portion of the reference.
【0003】次に、第1複合材101を前方押出し成形
を施すことにより、図12(d)に示したように、先端
側に軸状部102(外径=φd1 )、および前方押出し
成形が施されない残部103を有する丸棒状の押出し成
形体104を成形する。そして、図12(e)に示した
ように、押出し成形体104の残部103を含んだ部分
105を切断して丸棒状の第2複合材106を形成する
第2工程を行う。Next, by subjecting the first composite material 101 to front extrusion molding, as shown in FIG. 12 (d), the shaft-shaped portion 102 (outer diameter = φd1) and the front extrusion molding are formed on the tip side. A round rod-shaped extruded body 104 having a remaining portion 103 which is not applied is formed. Then, as shown in FIG. 12E, the second step of forming the round bar-shaped second composite material 106 by cutting the portion 105 including the remaining portion 103 of the extrusion molded body 104 is performed.
【0004】次に、第2複合材106の軸状部102の
先端側を押通し成形することによって、図12(f)に
示したように、先端側に径中部107(外径=φd2
)、および後端側に鍔部108を有する段付の第3複
合材109を形成する第3工程を行う。Next, the distal end side of the shaft-like portion 102 of the second composite material 106 is press-molded to form a diameter middle portion 107 (outer diameter = φd2) on the distal end side as shown in FIG.
), And the third step of forming the stepped third composite material 109 having the flange 108 on the rear end side.
【0005】次に、第3複合材109の軸状部102の
径中部107の先端の外周を切削加工を施すことによ
り、図12(g)に示したように、径小部110(外径
=φd3 )を有する段付の第4複合材111を形成する
第4工程を行う。この第4複合材111の軸状部10
2、径中部107および鍔部108は切削加工しない。Next, by cutting the outer periphery of the tip of the diameter middle portion 107 of the shaft-like portion 102 of the third composite material 109, as shown in FIG. 12 (g), the small diameter portion 110 (outer diameter) The fourth step of forming the stepped fourth composite material 111 having = φd3) is performed. The shaft-like portion 10 of the fourth composite material 111
2. The middle diameter portion 107 and the collar portion 108 are not cut.
【0006】なお、従来の製造方法の特徴としては、図
12(f)に示したように、第3工程で、第2複合材1
06の先端側を押通し成形を施して細径化し、後端側を
鍔状に成形していた。この理由は、複合材であることも
あって、φd1 の軸状部102をφd2 の径中部107
に押通し成形する場合の断面減少率(演算式は以下の数
1の通り)ε1 、2 は経験上21%が限界であった。そ
れよりも、細いφd3の径小部110は押通し成形を施
すことができないので、第4工程でφd2 の一部を切削
加工することによりφd2 の一部をφd3 に細径化して
いた。ここで、前方押出し成形とは金型(ダイス)内部
に成形体が拘束されて押し出されること、押通し成形と
は金型内部に成形体が拘束されず(一部食み出し)押出
しされることを言う。As a characteristic of the conventional manufacturing method, as shown in FIG. 12 (f), in the third step, the second composite material 1 is used.
The front end side of 06 was subjected to press molding to reduce the diameter, and the rear end side was formed into a brim. The reason for this is that, because it is a composite material, the shaft-shaped portion 102 of φd1 is replaced with the middle diameter portion 107 of φd2.
From the experience, the limit of the cross-section reduction rate (calculation formula is the following mathematical formula 1) ε1,2 in the case of press forming into 21 was 21%. On the other hand, since the small diameter portion 110 having a smaller diameter of φd3 cannot be press-molded, a portion of φd2 was cut to φd3 by cutting a portion of φd2 in the fourth step. Here, the forward extrusion molding means that the molded body is constrained and extruded inside the mold (die), and the push-through molding is that the molded body is extruded without being constrained inside the mold (partially protruding). Say that.
【数1】 [Equation 1]
【0007】[0007]
【発明が解決しようとする課題】ところが、従来の製造
方法においては、第4工程でφd2 の一部を切削加工す
る場合でも、φd3 の径小部110はかなり細いため、
適切な切削速度を得るためには自動切削機のスピンドル
の回転速度を高速化する必要があるが、自動切削機のよ
うに、停止→加速→切削→減速→停止という運転サイク
ルの繰り返しでは、1個の第3複合材109を所定の切
削時間(例えば4秒間)で切削加工して第4複合材11
1を成形するピースタイムの兼ね合いもあり、自動切削
機のスピンドルの回転速度を高速化するにも限界があっ
た。However, in the conventional manufacturing method, even when a part of φd2 is cut in the fourth step, since the small diameter portion 110 of φd3 is considerably thin,
In order to obtain an appropriate cutting speed, it is necessary to increase the rotation speed of the spindle of the automatic cutting machine. However, like the automatic cutting machine, when the operation cycle of stop → acceleration → cutting → deceleration → stop is repeated, The fourth composite material 11 is obtained by cutting the third composite material 109 for a predetermined cutting time (for example, 4 seconds).
There is also a trade-off of the piece time for molding No. 1, and there is a limit to increasing the rotation speed of the spindle of the automatic cutting machine.
【0008】すなわち、スピンドルの回転速度を、上
げ、下げするには、図13のタイムチャートに示したよ
うに、時刻t1→時刻t2の所要時間ta、時刻t3→
時刻t4の所要時間tbが多く必要となり、結果的にピ
ースタイムが長くなる。そのため、最適な切削速度が得
られず、被切削面の面粗度が悪く、切削バイトの欠けも
発生し、不良品が多発することにより製造コストが上昇
するという問題が生じている。また、寸法精度も悪く、
切削バリの発生による問題も生じている。That is, in order to increase or decrease the rotational speed of the spindle, as shown in the time chart of FIG. 13, the required time ta from time t1 to time t2, time t3 to time t3 →
A large amount of time tb is required at time t4, resulting in a long peace time. Therefore, the optimum cutting speed cannot be obtained, the surface roughness of the surface to be cut is poor, chipping of the cutting tool occurs, and the number of defective products increases, resulting in an increase in manufacturing cost. Also, the dimensional accuracy is poor,
There are also problems caused by cutting burrs.
【0009】この発明は、径小部を切削加工することな
く成形して、径小部の成形時間の短縮化を図りながら
も、不良品の発生を防止することにより、製造価格の上
昇を防止することが可能な点火栓用複合電極の製造方法
の提供を目的とする。According to the present invention, the manufacturing cost is prevented from increasing by forming the small diameter portion without cutting, thereby shortening the molding time of the small diameter portion and preventing defective products. An object of the present invention is to provide a method of manufacturing a composite electrode for a spark plug that can be manufactured.
【0010】[0010]
【課題を解決するための手段】請求項1に記載の発明
は、耐熱性および耐食性に優れる第1金属材からなるカ
ップ内に、熱伝導性に優れる第2金属材を有する第1複
合材を形成する第1工程と、前記第1複合材に前方押出
し成形を施すことにより、前記第1複合材の先端側を細
径化した軸状部と押出し成形を施さない残部を形成した
後に、前記残部を除去した第2複合材を形成する第2工
程と、前記第2複合材に前方押出し成形を施すことによ
り、前記第2複合材の前記軸状部の先端を細径化した軸
状の径小部を有する第3複合材を形成する第3工程と、
前記第3複合材に押通し成形を施すことにより、前記第
3複合材の前記軸状部の径小部寄りを細径化して、前記
径小部よりも太い径中部を形成し、且つ前記軸状部の後
端部に鍔部を有する第4複合材を形成する第4工程とを
備えた点火栓用複合電極の製造方法を採用した。According to a first aspect of the present invention, there is provided a first composite material having a second metal material having excellent heat conductivity in a cup made of a first metal material having excellent heat resistance and corrosion resistance. After forming a first step of forming and a front extrusion molding of the first composite material to form a shaft-shaped portion having a reduced diameter on the front end side of the first composite material and a remaining portion not subjected to extrusion molding, A second step of forming a second composite material from which the remaining portion is removed, and a forward extrusion molding of the second composite material to form a shaft-shaped portion in which the tip of the shaft-shaped portion of the second composite material has a reduced diameter. A third step of forming a third composite material having a small diameter portion,
By subjecting the third composite material to press-through molding, the diameter of the shaft-like portion of the third composite material closer to the small diameter portion is reduced to form a middle diameter portion thicker than the small diameter portion, and And a fourth step of forming a fourth composite material having a collar portion at the rear end portion of the shaft-shaped portion.
【0011】請求項2に記載の発明は、耐熱性および耐
食性に優れる第1金属材からなるカップ内に、熱伝導性
に優れる第2金属材を有する第1複合材を形成する第1
工程と、前記第1複合材に前方押出し成形を施すことに
より、前記第1複合材の先端側を細径化した軸状部と押
出し成形を施さない残部を形成した後に、前記残部を除
去した第2複合材を形成する第2工程と、前記第2複合
材に前方押出し成形を施すことにより、前記第2複合材
の前記軸状部の先端を細径化した軸状の径小部を有する
第3複合材を形成する第3工程と、前記第3複合材に鍛
造成形を施すことにより、前記第3複合材の前記軸状部
の外周に2個の平行面を有する第4複合材を形成する第
4工程とを備えた点火栓用複合電極の製造方法を採用し
た。According to a second aspect of the present invention, a first composite material having a second metal material having excellent thermal conductivity is formed in a cup made of a first metal material having excellent heat resistance and corrosion resistance.
And a step of performing forward extrusion molding on the first composite material to form a shaft-shaped portion having a reduced diameter on the front end side of the first composite material and a remaining portion not subjected to extrusion molding, and then removing the remaining portion. A second step of forming a second composite material, and a forward extruding molding of the second composite material to form a shaft-shaped small-diameter portion in which the tip of the shaft-shaped portion of the second composite material is thinned. A fourth composite material having two parallel surfaces on the outer periphery of the shaft-like portion of the third composite material by performing a third step of forming the third composite material and a forging process on the third composite material. And a fourth step of forming a spark plug composite electrode.
【0012】請求項3に記載の発明は、耐熱性および耐
食性に優れる第1金属材からなるカップ内に、熱伝導性
に優れる第2金属材を有する第1複合材を形成する第1
工程と、前記第1複合材に前方押出し成形を施すことに
より、前記第1複合材の先端側を細径化した軸状部と押
出し成形を施さない残部を形成した後に、前記残部を除
去した第2複合材を形成する第2工程と、前記第2複合
材に前方押出し成形を施すことにより、前記第2複合材
の前記軸状部の先端を細径化した軸状の径小部を有する
第3複合材を形成する第3工程と、前記第3複合材に押
通し成形を施すことにより、前記第3複合材の前記径小
部の先端をさらに細径化して最径小部を形成し、且つ前
記軸状部の後端部に鍔部を有する第4複合材を形成する
第4工程とを備えた点火栓用複合電極の製造方法を採用
した。According to a third aspect of the present invention, a first composite material having a second metal material having excellent heat conductivity is formed in a cup made of a first metal material having excellent heat resistance and corrosion resistance.
And a step of performing forward extrusion molding on the first composite material to form a shaft-shaped portion having a reduced diameter on the front end side of the first composite material and a remaining portion not subjected to extrusion molding, and then removing the remaining portion. A second step of forming a second composite material, and a forward extruding molding of the second composite material to form a shaft-shaped small-diameter portion in which the tip of the shaft-shaped portion of the second composite material is thinned. A third step of forming a third composite material having the same, and the third composite material is subjected to press molding to further reduce the diameter of the tip of the small diameter portion of the third composite material to form the smallest diameter small portion. And a fourth step of forming a fourth composite material having a collar portion at the rear end portion of the shaft-shaped portion, and a manufacturing method of a composite electrode for a spark plug.
【0013】[0013]
【作用および発明の効果】請求項1に記載の発明によれ
ば、耐熱性および耐食性に優れる第1金属材内に、熱伝
導性に優れる第2金属材を挿入することにより、第1複
合材が形成される。次に、この第1複合材に前方押出し
成形を施すことにより、第2複合材が形成される。この
とき、第2複合材には、第1複合材の先端側を細径化し
た軸状部と押出し成形を施さない残部が成形された後に
前記残部が除去される。According to the first aspect of the invention, the first composite material is obtained by inserting the second metal material having excellent heat conductivity into the first metal material having excellent heat resistance and corrosion resistance. Is formed. Next, the first composite material is subjected to forward extrusion molding to form a second composite material. At this time, in the second composite material, a shaft-shaped portion having a reduced diameter on the front end side of the first composite material and a remaining portion not subjected to extrusion molding are formed, and then the remaining portion is removed.
【0014】次に、この第2複合材に前方押出し成形を
施すことにより、第3複合材が形成される。このとき、
第3複合材には、第2複合材の軸状部の先端を細径化し
た軸状の径小部が成形される。次に、この第3複合材に
押通し成形を施すことにより、第4複合材が形成され
る。このとき、第4複合材には、第3複合材の軸状部の
径小部寄りを細径化した径中部が成形され、且つ軸状部
の後端部に鍔部が成形される。また、その径中部は、軸
状部よりも細く、径小部よりも太く成形される。したが
って、第3工程にて、複合電極の径小部を切削加工する
ことなく成形できるので、径小部の成形時間の短縮化を
図りながらも、不良品の発生を防止できる。これによ
り、複合電極(中心電極)の製造価格の上昇を抑えるこ
とができる。Next, the second composite material is subjected to front extrusion molding to form a third composite material. At this time,
In the third composite material, a shaft-shaped small-diameter portion is formed by thinning the tip of the shaft-shaped portion of the second composite material. Next, the fourth composite material is formed by subjecting the third composite material to press molding. At this time, the fourth composite material is formed with a diameter middle portion in which the diameter of the shaft-like portion of the third composite material is reduced, and a flange portion is formed at the rear end of the shaft-like portion. Further, the diameter middle part is formed thinner than the shaft-like part and thicker than the small diameter part. Therefore, in the third step, since the small diameter portion of the composite electrode can be formed without cutting, it is possible to prevent defective products while shortening the forming time of the small diameter portion. This can suppress an increase in the manufacturing cost of the composite electrode (center electrode).
【0015】請求項2に記載の発明によれば、耐熱性お
よび耐食性に優れる第1金属材内に、熱伝導性に優れる
第2金属材を挿入することにより、第1複合材が形成さ
れる。次に、この第1複合材に前方押出し成形を施すこ
とにより、第2複合材が形成される。このとき、第2複
合材には、第1複合材の先端側を細径化した軸状部と押
出し成形を施さない残部が成形されると共に、前記残部
が除去される。According to the second aspect of the present invention, the first composite material is formed by inserting the second metal material having excellent heat conductivity into the first metal material having excellent heat resistance and corrosion resistance. . Next, the first composite material is subjected to forward extrusion molding to form a second composite material. At this time, the second composite material is formed with a shaft-shaped portion having a reduced diameter on the front end side of the first composite material and a remaining portion not subjected to extrusion molding, and the remaining portion is removed.
【0016】次に、この第2複合材に前方押出し成形を
施すことにより、第3複合材が形成される。このとき、
第3複合材には、第2複合材の軸状部の先端を細径化し
た軸状の径小部が成形される。次に、この第3複合材に
鍛造成形を施すことにより、第4複合材が形成される。
このとき、第4複合材には、第3複合材の軸状部の外周
に2個の平行面が成形される。したがって、第3工程に
て、複合電極の径小部を切削加工することなく成形でき
るので、径小部の成形時間の短縮化を図りながらも、不
良品の発生を防止できる。これにより、複合電極(側方
電極)の製造価格の上昇を抑えることができる。Next, the second composite material is subjected to forward extrusion molding to form a third composite material. At this time,
In the third composite material, a shaft-shaped small-diameter portion is formed by thinning the tip of the shaft-shaped portion of the second composite material. Next, the fourth composite material is formed by subjecting the third composite material to forging.
At this time, in the fourth composite material, two parallel surfaces are formed on the outer periphery of the shaft-shaped portion of the third composite material. Therefore, in the third step, since the small diameter portion of the composite electrode can be formed without cutting, it is possible to prevent defective products while shortening the forming time of the small diameter portion. This can suppress an increase in the manufacturing cost of the composite electrode (side electrode).
【0017】請求項3に記載の発明によれば、請求項1
に記載の発明と同じ第3工程において、第3複合材を形
成した後に、第3複合材を押通し成形を施すことによ
り、径小部の先端をさらに細径化した最径小部と後端部
に鍔部を有する第4複合材が形成される。したがって、
この第4複合材は請求項1に記載の径小部より複合電極
(例えば中心電極)の先端径をさらに細くする場合に効
果的に工程を増すことなく成形することができる。According to the invention of claim 3, claim 1
In the same third step as that of the invention described in 1), after forming the third composite material, the third composite material is subjected to press molding to further reduce the diameter of the tip of the small diameter portion and the rear end of the smallest diameter portion. A fourth composite material having a brim at its end is formed. Therefore,
This fourth composite material can be effectively molded without increasing the number of steps when the tip diameter of the composite electrode (for example, the center electrode) is made thinner than the small diameter portion described in claim 1.
【0018】[0018]
【実施例】この発明の点火栓用複合電極の製造方法を図
に示す実施例に基づき説明する。EXAMPLE A method of manufacturing a composite electrode for a spark plug according to the present invention will be described based on an example shown in the drawings.
【0019】〔第1実施例の製造方法〕図1ないし図8
はこの発明の第1実施例を示したもので、図1は2極ス
パークプラグ用の複合中心電極の製造方法を示した工程
図である。[Manufacturing Method of First Embodiment] FIGS. 1 to 8
Shows a first embodiment of the present invention, and FIG. 1 is a process diagram showing a method for manufacturing a composite center electrode for a bipolar spark plug.
【0020】(第1製造工程、カップ成形工程)初め
に、耐熱性および耐食性に優れたニッケルまたはニッケ
ル合金等の第1金属材製の線材から円柱状の素材を切断
する。そして、図2に示したように、この素材を金型1
の丸穴1a内に挿入してパンチ2で平行打ちすることに
よって、断面形状が円柱形状のビレット3を形成する。
このとき、ビレット3の先端部の外周には円弧状のコー
ナー4が成形され、ビレット3の後端面には平坦面5が
成形される。なお、ニッケル合金としては、例えば8重
量%のFe、16重量%のCr、0.2重量%のCu、
75.8重量%のNiよりなるインコネル600(商標
名)、Ni−Mn−Si合金、Ni−Mn−Si−Cr
合金、Ni−Mn−Si−Cr−Al合金等を用いるこ
とができる。ここで、2aは成形後のビレット3を金型
1の丸穴1a内から突き出すためのキックアウトピンで
ある。(First Manufacturing Step, Cup Molding Step) First, a columnar material is cut from a wire made of a first metal material such as nickel or nickel alloy having excellent heat resistance and corrosion resistance. Then, as shown in FIG.
Then, the billet 3 having a cylindrical cross section is formed by inserting the billet 3 into the round hole 1a of FIG.
At this time, an arcuate corner 4 is formed on the outer periphery of the tip of the billet 3, and a flat surface 5 is formed on the rear end surface of the billet 3. As the nickel alloy, for example, 8 wt% Fe, 16 wt% Cr, 0.2 wt% Cu,
Inconel 600 (trade name) consisting of 75.8 wt% Ni, Ni-Mn-Si alloy, Ni-Mn-Si-Cr
An alloy, a Ni-Mn-Si-Cr-Al alloy, or the like can be used. Here, 2a is a kick-out pin for ejecting the billet 3 after molding from the inside of the round hole 1a of the mold 1.
【0021】(第2製造工程、カップ成形工程)次に、
図3に示したように、このビレット3を金型6の丸穴6
a内に挿入してパンチ7で穿つことによって、断面形状
が円柱形状のビレット8を形成する。このとき、ビレッ
ト8の後端面には略円形状の下孔9が成形される。ここ
で、7aは成形後のビレット8を金型6の丸穴6a内か
ら突き出すためのキックアウトピンである。(Second manufacturing process, cup molding process) Next,
As shown in FIG. 3, the billet 3 is inserted into the round hole 6 of the mold 6.
The billet 8 having a cylindrical cross-section is formed by inserting the billet 8 into a and punching it with the punch 7. At this time, a substantially circular pilot hole 9 is formed on the rear end surface of the billet 8. Here, 7a is a kick-out pin for protruding the billet 8 after molding from the inside of the round hole 6a of the die 6.
【0022】(第3製造工程、カップ成形工程)次に、
図4に示したように、このビレット8を金型10の丸穴
10a内に挿入して下孔9をパンチ11でさらに穿つこ
とによって、図1(b)に示したように、断面形状が円
筒形状のカップ12を形成する。このとき、カップ12
の内部には、先端が閉塞され、後端が開口した軸方向穴
(凹部)13が成形される。ここで、11aは成形後の
カップ12を金型10の丸穴10a内から突き出すため
のキックアウトピンである。(Third manufacturing process, cup forming process) Next,
As shown in FIG. 4, the billet 8 is inserted into the round hole 10a of the die 10 and the pilot hole 9 is further punched by the punch 11 so that the cross-sectional shape becomes as shown in FIG. 1 (b). The cup 12 having a cylindrical shape is formed. At this time, cup 12
An axial hole (recess) 13 having a closed front end and an open rear end is formed inside the. Here, 11a is a kick-out pin for protruding the molded cup 12 from the inside of the round hole 10a of the mold 10.
【0023】(第4製造工程、軸芯成形工程)一方、熱
伝導性に優れた銅または銅合金等の第2金属材に塑性加
工を施すことにより、図1(a)に示したように、断面
形状が円柱形状の軸芯14を形成する。この軸芯14に
は、先端側にカップ12の軸方向穴13の深さよりやや
長い軸方向寸法で、且つ軸方向穴13の内径とほぼ同じ
外径を持つ軸状の円柱部15、および後端側に円柱部1
5より外径が大きい円板部15aが成形される。(Fourth Manufacturing Step, Axial Core Forming Step) On the other hand, as shown in FIG. 1A, the second metal material such as copper or copper alloy having excellent thermal conductivity is subjected to plastic working. The shaft core 14 having a columnar cross section is formed. The shaft core 14 has a shaft-shaped cylindrical portion 15 on the front end side, which has an axial dimension slightly longer than the depth of the axial hole 13 of the cup 12, and has an outer diameter substantially the same as the inner diameter of the axial hole 13, and a rear portion. Cylindrical part 1 on the end side
A disk portion 15a having an outer diameter larger than 5 is formed.
【0024】(第5製造工程、第1複合材成形工程)次
に、図5に示したように、カップ12の軸方向穴13内
に軸芯14の円柱部15を遊嵌した嵌合体を、金型17
の丸穴17a内に挿入してパンチ16で平行打ちするこ
とによって、図1(c)に示したように、第1複合材1
8を形成する。このとき、軸芯14は、円板部15aが
軸方向穴13の後端面より突出した状態でカップ12内
に緊密的に保持される。以上が請求項1に記載の発明の
第1工程に相当する。ここで、16aは成形後の第1複
合材18を金型17の丸穴17a内から突き出すための
キックアウトピンである。(Fifth Manufacturing Step, First Composite Material Forming Step) Next, as shown in FIG. 5, a fitting body in which the cylindrical portion 15 of the shaft core 14 is loosely fitted in the axial hole 13 of the cup 12 is formed. , Mold 17
1 (c), the first composite material 1 is inserted into the round hole 17a of
8 is formed. At this time, the shaft core 14 is tightly held in the cup 12 with the disk portion 15 a protruding from the rear end surface of the axial hole 13. The above corresponds to the first step of the invention described in claim 1. Here, 16a is a kick-out pin for protruding the first composite material 18 after molding from the inside of the round hole 17a of the mold 17.
【0025】(第6製造工程、第1押出し成形工程)次
に、図6に示したように、第1複合材18を金型19の
丸穴19a内に挿入してパンチ20で押し込んで前方押
出し成形することによって、第1複合材18の先端側を
細径化して、図1(d)に示したように、丸棒状の押出
し成形体21を形成する。この押出し成形体21の先端
側には第1複合材18より外径が小さい丸軸状の軸状部
(φd1 :例えばφ2.6)22が成形され、後端側に
は前方押出し成形が施されない残部23が成形される。(Sixth Manufacturing Step, First Extrusion Molding Step) Next, as shown in FIG. 6, the first composite material 18 is inserted into the round hole 19a of the mold 19 and pushed by the punch 20 to move forward. By extruding, the diameter of the front end side of the first composite material 18 is reduced to form a round bar-shaped extruded body 21 as shown in FIG. 1 (d). A round shaft-shaped portion (φd1: for example, φ2.6) 22 having an outer diameter smaller than that of the first composite material 18 is formed on the front end side of the extruded body 21, and front extrusion molding is performed on the rear end side. The remaining part 23 which is not formed is molded.
【0026】(第7製造工程、切断工程、第2複合材成
形工程)次に、押出し成形体21の後端側の残部23を
含む部分24を切断することにより、図1(e)に示し
たように、軸状部22を有する第2複合材25を形成す
る。以上が請求項1に記載の発明の第2工程に相当す
る。(Seventh Manufacturing Step, Cutting Step, Second Composite Material Forming Step) Next, by cutting the portion 24 including the remaining portion 23 on the rear end side of the extrusion molded body 21, as shown in FIG. 1 (e). As described above, the second composite material 25 having the shaft-shaped portion 22 is formed. The above corresponds to the second step of the invention described in claim 1.
【0027】(第8製造工程、第3複合材成形工程、第
2押出し成形工程)次に、図7に示したように、第2複
合材25を金型26の丸穴26a内に挿入してパンチ2
7で押し込んで前方押出し成形することによって、第2
複合材25の軸状部22の先端側をさらに細径化して、
図1(f)に示したように、段付の第3複合材28を形
成する。この第3複合材28の軸状部22の先端側に
は、軸状部22よりも外径が小さい丸軸状の径小部(φ
d3 :例えばφ2.0)29が成形される。以上が請求
項1に記載の発明の第3工程に相当する。(Eighth Manufacturing Step, Third Composite Material Forming Step, Second Extrusion Molding Step) Next, as shown in FIG. 7, the second composite material 25 is inserted into the round hole 26a of the die 26. Punch 2
By pushing in at 7 and extruding forward, the second
The tip side of the shaft-like portion 22 of the composite material 25 is further thinned,
As shown in FIG. 1F, the stepped third composite material 28 is formed. On the tip end side of the shaft-shaped portion 22 of the third composite material 28, a small diameter portion (φ) having a round shaft shape having an outer diameter smaller than that of the shaft-shaped portion 22 is formed.
d3: For example, φ2.0) 29 is molded. The above corresponds to the third step of the invention described in claim 1.
【数2】 このときの断面減少率ε1 、3 は、上記の数2の式の通
りで、40.8%となり、径小部29の押通し成形はで
きないが押出し成形は可能となる。[Equation 2] The cross-section reduction ratios ε 1 and 3 at this time are 40.8% according to the equation of the above-mentioned equation 2, and the extrusion molding is possible although the small diameter portion 29 cannot be pushed through.
【0028】(第9製造工程、第4複合材成形工程、押
通し成形工程)次に、図8に示したように、第3複合材
28を丸穴形状の金型30の丸穴30a内に挿入してパ
ンチ31で押し込んで押通し成形することによって、第
3複合材28の軸状部22の先端側をさらに細径化し
て、図1(g)に示したように、2段付の第4複合材3
2を形成する。この第4複合材32の軸状部22と径小
部29との間には、軸状部22よりも外径が小さく、径
小部29よりも外径が大きい段部としての丸軸状の径中
部(φd2 :例えばφ2.5)33が成形され、且つ第
4複合材32の後端側には鍔部34が成形される。第4
複合材32は複合中心電極41(図9参照)として使用
される。以上が請求項1に記載の発明の第4工程に相当
する。ここで、31aは成形後の第4複合材32を金型
30の待つ穴30aから突き出すためのキックアウトピ
ンである。(Ninth Manufacturing Step, Fourth Composite Material Forming Step, Push Molding Step) Next, as shown in FIG. 8, the third composite material 28 is placed in the round hole 30a of the round-hole-shaped die 30. By inserting it into the mold and pushing it with the punch 31 to form the shaft, the tip side of the shaft-like portion 22 of the third composite material 28 is further thinned, and as shown in FIG. 4th composite material 3
Form 2 Between the shaft-shaped portion 22 and the small-diameter portion 29 of the fourth composite material 32, a round shaft-shaped portion having a smaller outer diameter than the shaft-shaped portion 22 and a larger outer diameter than the small-diameter portion 29 is formed. A middle diameter portion (φd2: φ2.5, for example) 33 is formed, and a flange portion 34 is formed on the rear end side of the fourth composite material 32. Fourth
The composite material 32 is used as the composite center electrode 41 (see FIG. 9). The above corresponds to the fourth step of the invention described in claim 1. Here, 31a is a kick-out pin for ejecting the molded fourth composite material 32 from the waiting hole 30a of the die 30.
【0029】(点火栓の構成)図9はこの実施例の製造
方法によって製造された複合中心電極41を持つ内燃機
関用2極スパークプラグ(点火栓)42の火花放電部を
示した半断面図である。(Structure of Spark Plug) FIG. 9 is a half sectional view showing a spark discharge portion of a two-pole spark plug (spark plug) 42 for an internal combustion engine having a composite center electrode 41 manufactured by the manufacturing method of this embodiment. Is.
【0030】この内燃機関用2極スパークプラグ42
は、アルミナ等の焼結体よりなる筒状の絶縁碍子43、
この絶縁碍子43を保持する筒状の主体金具44、およ
びこの主体金具44の先端面に溶接された2極の側方電
極45等から構成されている。なお、複合中心電極41
は、絶縁碍子43の先端面より少なくとも径小部29が
突出した状態で、軸孔46内に挿入されている。また、
2極の側方電極45の先端面は、複合中心電極41の先
端部の側面との間に火花ギャップを形成する。This two-pole spark plug 42 for internal combustion engine
Is a cylindrical insulator 43 made of a sintered body such as alumina,
It is composed of a tubular metal shell 44 that holds the insulator 43, and a two-pole side electrode 45 welded to the front end surface of the metal shell 44. The composite center electrode 41
Is inserted into the shaft hole 46 in a state where at least the small diameter portion 29 projects from the tip end surface of the insulator 43. Also,
The tip surface of the two-pole side electrode 45 forms a spark gap with the side surface of the tip portion of the composite center electrode 41.
【0031】〔第1実施例の効果〕以上のように、この
実施例では、図1に示したように、複合中心電極41の
径小部29を前方押出しによる塑性加工により成形でき
るので、切削加工が不要となる。これにより、切削加工
による各種の不具合を回避することができる。例えば削
り屑がなくなるので高価なニッケル(Ni)合金材の材
料費低減の他に複合材の被切削面の面粗度の悪化、切削
バイトの欠けの発生を防止でき、不良品の多発を抑える
ことができる。また、寸法精度の悪化や切削バリの発生
を招くこともない。さらに、1個の複合中心電極41の
製造時間を短縮することができるので、ピースタイムを
短縮することができる。したがって、材料費の低減、不
良品の多発を抑え、自動切削機が不要となり、さらにピ
ースタイムを短縮できるので、製造コストを軽減するこ
とができる[Effects of First Embodiment] As described above, in this embodiment, as shown in FIG. 1, the small diameter portion 29 of the composite center electrode 41 can be formed by plastic working by forward extrusion, so No processing is required. This makes it possible to avoid various problems caused by cutting. For example, since shavings are eliminated, the material cost of expensive nickel (Ni) alloy material is reduced, deterioration of surface roughness of the cut surface of the composite material, occurrence of chipping of cutting bite can be prevented, and frequent occurrence of defective products is suppressed. be able to. In addition, dimensional accuracy does not deteriorate and cutting burrs do not occur. Furthermore, since it is possible to shorten the manufacturing time of one composite center electrode 41, it is possible to shorten the piece time. Therefore, the material cost can be reduced, the occurrence of defective products can be suppressed, the automatic cutting machine can be eliminated, and the piece time can be shortened, so that the manufacturing cost can be reduced.
【0032】〔第2実施例〕図10はこの発明の第2実
施例を示したもので、複合側方電極の製造方法を示した
工程図である。[Second Embodiment] FIG. 10 shows a second embodiment of the present invention and is a process chart showing a method for manufacturing a composite lateral electrode.
【0033】この実施例では、第1実施例の製造方法を
用いて、図10(f)に示したように、軸状部22より
も外径が小さい円柱状の径小部29を有する第3複合材
28を形成した後に、第3複合材28の軸状部22を鍛
造加工することによって、図10(g)に示したよう
に、軸状部22の外周に2個の平行面35を有する第4
複合材36を形成する。この第4複合材36は多極スパ
ークプラグの複合側方電極として使用される。In this embodiment, using the manufacturing method of the first embodiment, as shown in FIG. 10 (f), a cylindrical small diameter portion 29 having an outer diameter smaller than that of the shaft portion 22 is formed. After forming the third composite material 28, by forging the shaft-shaped portion 22 of the third composite material 28, two parallel surfaces 35 are formed on the outer periphery of the shaft-shaped portion 22 as shown in FIG. Having a fourth
The composite material 36 is formed. This fourth composite material 36 is used as a composite lateral electrode of a multipolar spark plug.
【0034】〔第3実施例〕図11はこの発明の第3実
施例を示したもので、複合中心電極の製造方法を示した
工程図である。[Third Embodiment] FIG. 11 shows a third embodiment of the present invention and is a process diagram showing a method for manufacturing a composite center electrode.
【0035】この実施例では、第1実施例の製造方法を
用いて、図11(f)に示したように、軸状部22より
も外径が小さい円柱状の径小部29(例えば外径d3 =
2.0mm)を有する第3複合材28を形成した後に、第
3複合材28に押通し成形を施すことにより、径小部2
9の先端を、外径がさらに細い最径小部37(例えば外
径d4 =1.8mm)となるように成形し、且つ軸状部2
2の後端部に鍔部34を成形して第4複合材38を形成
する。なお、この第4複合材38の断面減少率は19%
であり、押通し加工は可能である。In this embodiment, using the manufacturing method of the first embodiment, as shown in FIG. 11 (f), a cylindrical small-diameter portion 29 (for example, an outer portion) having an outer diameter smaller than that of the shaft-like portion 22 is used. Diameter d3 =
After forming the third composite material 28 having a thickness of 2.0 mm), the small diameter portion 2
The tip of 9 is molded so as to be the smallest diameter smallest portion 37 (for example, outer diameter d4 = 1.8 mm) having a smaller outer diameter, and the shaft-shaped portion 2
The collar portion 34 is formed at the rear end of the second composite material 38 to form the fourth composite material 38. The cross-section reduction rate of this fourth composite material 38 is 19%.
Therefore, the punching process is possible.
【0036】〔変形例〕この実施例では、本発明を、第
1金属材と第2金属材とを一体化した複合中心電極41
または複合側方電極の製造方法に用いたが、本発明を、
第1金属材と第2金属材とを一体化し、さらに第2金属
材内に熱伝導性に優れる純ニッケル(Ni)等の第3金
属材を封入した複合中心電極または複合側方電極の製造
方法に用いても良い。また、第2金属材(Cu、Cu合
金)は円板部15a{図1(a)参照)}が省略された
円柱状の棒体を第1金属材のカップ12内に封入したも
のを用いても良い。[Modification] In this embodiment, the present invention is applied to a composite center electrode 41 in which a first metal material and a second metal material are integrated.
Alternatively, the present invention was used in the method for manufacturing a composite lateral electrode.
Manufacture of a composite center electrode or a composite lateral electrode in which a first metal material and a second metal material are integrated and a third metal material such as pure nickel (Ni) having excellent thermal conductivity is enclosed in the second metal material. You may use for the method. As the second metal material (Cu, Cu alloy), use is made of a cylindrical rod body in which the disk portion 15a (see FIG. 1 (a)) is omitted and which is enclosed in the cup 12 of the first metal material. May be.
【0037】複合中心電極41の発火面や複合側方電極
の発火面に白金等の貴金属電極を取り付けても良い。こ
の実施例では、2極スパークプラグ42に複合中心電極
41を組み付けたが、側方電極が1極で複合中心電極の
先端面と対向するスパークプラグ、あるいは側方電極が
3極以上の多極スパークプラグに複合中心電極41を組
み付けても良い。また、金型1、6、10、17、2
6、30を2個以上の部品により構成しても良い。A noble metal electrode such as platinum may be attached to the firing surface of the composite center electrode 41 or the firing surface of the composite side electrode. In this embodiment, the composite center electrode 41 is assembled to the two-pole spark plug 42. However, the side electrode has one pole and the spark plug faces the front end surface of the composite center electrode, or the side electrode has three or more poles. The composite center electrode 41 may be attached to the spark plug. Also, molds 1, 6, 10, 17, 2
6, 30 may be composed of two or more parts.
【図1】この発明の第1実施例にかかる各製造工程を示
した工程図である。FIG. 1 is a process drawing showing each manufacturing process according to the first embodiment of the present invention.
【図2】この発明の第1実施例にかかる第1製造工程を
示した断面図である。FIG. 2 is a sectional view showing a first manufacturing process according to the first embodiment of the present invention.
【図3】この発明の第1実施例にかかる第2製造工程を
示した断面図である。FIG. 3 is a sectional view showing a second manufacturing step according to the first embodiment of the present invention.
【図4】この発明の第1実施例にかかる第3製造工程を
示した断面図である。FIG. 4 is a sectional view showing a third manufacturing process according to the first embodiment of the present invention.
【図5】この発明の第1実施例にかかる第5製造工程を
示した断面図である。FIG. 5 is a sectional view showing a fifth manufacturing process according to the first embodiment of the present invention.
【図6】この発明の第1実施例にかかる第6製造工程を
示した断面図である。FIG. 6 is a sectional view showing a sixth manufacturing process according to the first embodiment of the present invention.
【図7】この発明の第1実施例にかかる第8製造工程を
示した断面図である。FIG. 7 is a sectional view showing an eighth manufacturing process according to the first embodiment of the present invention.
【図8】この発明の第1実施例にかかる第9製造工程を
示した断面図である。FIG. 8 is a sectional view showing a ninth manufacturing process according to the first embodiment of the present invention.
【図9】この発明の第1実施例を用いて製造された点火
栓の主要部を判断面で示した正面図である。FIG. 9 is a front view showing a judgment surface of a main part of the spark plug manufactured by using the first embodiment of the present invention.
【図10】この発明の第2実施例にかかる各製造工程を
示した工程図である。FIG. 10 is a process drawing showing each manufacturing process according to the second embodiment of the present invention.
【図11】この発明の第3実施例にかかる各製造工程を
示した工程図である。FIG. 11 is a process drawing showing each manufacturing process according to the third embodiment of the present invention.
【図12】従来の製造方法にかかる各製造工程を示した
工程図である。FIG. 12 is a process drawing showing each manufacturing process according to a conventional manufacturing method.
【図13】スピンドルの回転速度の変化を示したタイム
チャートである。FIG. 13 is a time chart showing changes in the rotation speed of the spindle.
18 第1複合材 22 軸状部 23 残部 25 第2複合材 28 第3複合材 29 径小部 32 第4複合材(複合中心電極) 33 径中部 34 鍔部 35 平行面 36 第4複合材(複合外側電極) 37 最径小部 38 第4複合材(複合中心電極) 41 複合中心電極 42 2極スパークプラグ 18 1st composite material 22 Shaft-like part 23 Remaining part 25 2nd composite material 28 3rd composite material 29 Small diameter part 32 4th composite material (composite center electrode) 33 Diameter center part 34 Collar part 35 Parallel surface 36 4th composite material ( Composite outer electrode) 37 Smallest diameter part 38 Fourth composite material (composite center electrode) 41 Composite center electrode 42 Two-pole spark plug
Claims (3)
属材からなるカップ内に、熱伝導性に優れる第2金属材
を有する第1複合材を形成する第1工程と、 (b)前記第1複合材に前方押出し成形を施すことによ
り、前記第1複合材の先端側を細径化した軸状部と押出
し成形を施さない残部を形成した後に、前記残部を除去
した第2複合材を形成する第2工程と、 (c)前記第2複合材に前方押出し成形を施すことによ
り、前記第2複合材の前記軸状部の先端を細径化した軸
状の径小部を有する第3複合材を形成する第3工程と、 (d)前記第3複合材に押通し成形を施すことにより、
前記第3複合材の前記軸状部の径小部寄りを細径化し
て、前記径小部よりも太い径中部を形成し、且つ前記軸
状部の後端部に鍔部を有する第4複合材を形成する第4
工程とを備えた点火栓用複合電極の製造方法。1. A first step of forming a first composite material having a second metal material having excellent thermal conductivity in a cup made of a first metal material having excellent heat resistance and corrosion resistance, and (b) By subjecting the first composite material to forward extrusion molding, a shaft-shaped portion having a reduced diameter on the tip side of the first composite material and a remaining portion not subjected to extrusion molding are formed, and then the remaining portion is removed to obtain a second composite material. A second step of forming a material, and (c) by subjecting the second composite material to forward extrusion molding, a shaft-shaped small-diameter portion in which the tip of the shaft-shaped portion of the second composite material is thinned. A third step of forming a third composite material having: (d) by subjecting the third composite material to press molding,
A fourth composite having a shaft portion having a collar portion formed at a rear end portion of the third composite material by reducing a diameter of a portion of the shaft portion near the small diameter portion to form a middle diameter portion thicker than the small diameter portion. Fourth forming composite
A method of manufacturing a composite electrode for a spark plug, comprising the steps of:
属材からなるカップ内に、熱伝導性に優れる第2金属材
を有する第1複合材を形成する第1工程と、 (b)前記第1複合材に前方押出し成形を施すことによ
り、前記第1複合材の先端側を細径化した軸状部と押出
し成形を施さない残部を形成した後に、前記残部を除去
した第2複合材を形成する第2工程と、 (c)前記第2複合材に前方押出し成形を施すことによ
り、前記第2複合材の前記軸状部の先端を細径化した軸
状の径小部を有する第3複合材を形成する第3工程と、 (d)前記第3複合材に鍛造成形を施すことにより、前
記第3複合材の前記軸状部の外周に2個の平行面を有す
る第4複合材を形成する第4工程とを備えた点火栓用複
合電極の製造方法。2. A first step of forming a first composite material having a second metal material having excellent thermal conductivity in a cup made of a first metal material having excellent heat resistance and corrosion resistance, and (b) By subjecting the first composite material to forward extrusion molding, a shaft-shaped portion having a reduced diameter on the tip side of the first composite material and a remaining portion not subjected to extrusion molding are formed, and then the remaining portion is removed to obtain a second composite material. A second step of forming a material, and (c) by subjecting the second composite material to forward extrusion molding, a shaft-shaped small-diameter portion in which the tip of the shaft-shaped portion of the second composite material is thinned. A third step of forming a third composite material having: (d) a third composite material having two parallel surfaces on the outer periphery of the shaft-like portion by forging. 4. A method of manufacturing a composite electrode for a spark plug, comprising the fourth step of forming a composite material.
属材からなるカップ内に、熱伝導性に優れる第2金属材
を有する第1複合材を形成する第1工程と、 (b)前記第1複合材に前方押出し成形を施すことによ
り、前記第1複合材の先端側を細径化した軸状部と押出
し成形を施さない残部を形成した後に、前記残部を除去
した第2複合材を形成する第2工程と、 (c)前記第2複合材に前方押出し成形を施すことによ
り、前記第2複合材の前記軸状部の先端を細径化した軸
状の径小部を有する第3複合材を形成する第3工程と、 (d)前記第3複合材に押通し成形を施すことにより、
前記第3複合材の前記径小部の先端をさらに細径化して
最径小部を形成し、且つ前記軸状部の後端部に鍔部を有
する第4複合材を形成する第4工程とを備えた点火栓用
複合電極の製造方法。3. A first step of forming a first composite material having a second metal material having excellent thermal conductivity in a cup made of a first metal material having excellent heat resistance and corrosion resistance, and (b) By subjecting the first composite material to forward extrusion molding, a shaft-shaped portion having a reduced diameter on the tip side of the first composite material and a remaining portion not subjected to extrusion molding are formed, and then the remaining portion is removed to obtain a second composite material. A second step of forming a material, and (c) by subjecting the second composite material to forward extrusion molding, a shaft-shaped small-diameter portion in which the tip of the shaft-shaped portion of the second composite material is thinned. A third step of forming a third composite material having: (d) by subjecting the third composite material to press molding,
A fourth step of forming a fourth composite material by further thinning the tip of the small diameter portion of the third composite material to form the smallest diameter portion and having a collar portion at the rear end portion of the shaft-like portion. A method for manufacturing a composite electrode for a spark plug, comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02075895A JP3454596B2 (en) | 1995-02-08 | 1995-02-08 | Method of manufacturing composite electrode for spark plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02075895A JP3454596B2 (en) | 1995-02-08 | 1995-02-08 | Method of manufacturing composite electrode for spark plug |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08213150A true JPH08213150A (en) | 1996-08-20 |
JP3454596B2 JP3454596B2 (en) | 2003-10-06 |
Family
ID=12036100
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Application Number | Title | Priority Date | Filing Date |
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JP02075895A Expired - Fee Related JP3454596B2 (en) | 1995-02-08 | 1995-02-08 | Method of manufacturing composite electrode for spark plug |
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JP (1) | JP3454596B2 (en) |
Cited By (5)
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---|---|---|---|---|
WO2007105695A1 (en) | 2006-03-14 | 2007-09-20 | Ngk Spark Plug Co., Ltd. | Method for manufacturing spark plug and spark plug |
JP2012084272A (en) * | 2010-10-07 | 2012-04-26 | Ngk Spark Plug Co Ltd | Electrode for spark plug and method for manufacturing spark plug |
EP2461439A2 (en) | 2010-12-03 | 2012-06-06 | NGK Sparkplug Co., Ltd. | Method of manufacturing center electrode and spark plug |
JP2012240074A (en) * | 2011-05-18 | 2012-12-10 | Ngk Spark Plug Co Ltd | Electrode for spark plug and method for manufacturing spark plug |
CN108270149A (en) * | 2016-12-30 | 2018-07-10 | 宁波卓然铱金科技有限公司 | Central electrode manufacture nickel cup-copper core combination mechanism |
-
1995
- 1995-02-08 JP JP02075895A patent/JP3454596B2/en not_active Expired - Fee Related
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007105695A1 (en) | 2006-03-14 | 2007-09-20 | Ngk Spark Plug Co., Ltd. | Method for manufacturing spark plug and spark plug |
JPWO2007105695A1 (en) * | 2006-03-14 | 2009-07-30 | 日本特殊陶業株式会社 | Spark plug manufacturing method and spark plug |
US7896720B2 (en) | 2006-03-14 | 2011-03-01 | Ngk Spark Plug Co., Ltd. | Method of producing spark plug, and spark plug |
JP4672732B2 (en) * | 2006-03-14 | 2011-04-20 | 日本特殊陶業株式会社 | Spark plug manufacturing method and spark plug |
US8188640B2 (en) | 2006-03-14 | 2012-05-29 | Ngk Spark Plug Co., Ltd. | Spark plug center electrode with reduced cover portion thickness |
JP2012084272A (en) * | 2010-10-07 | 2012-04-26 | Ngk Spark Plug Co Ltd | Electrode for spark plug and method for manufacturing spark plug |
EP2461439A2 (en) | 2010-12-03 | 2012-06-06 | NGK Sparkplug Co., Ltd. | Method of manufacturing center electrode and spark plug |
JP2012119264A (en) * | 2010-12-03 | 2012-06-21 | Ngk Spark Plug Co Ltd | Center electrode and spark plug manufacturing method |
US8591276B2 (en) | 2010-12-03 | 2013-11-26 | Ngk Spark Plug Co., Ltd. | Method of manufacturing center electrode and spark plug |
JP2012240074A (en) * | 2011-05-18 | 2012-12-10 | Ngk Spark Plug Co Ltd | Electrode for spark plug and method for manufacturing spark plug |
CN108270149A (en) * | 2016-12-30 | 2018-07-10 | 宁波卓然铱金科技有限公司 | Central electrode manufacture nickel cup-copper core combination mechanism |
Also Published As
Publication number | Publication date |
---|---|
JP3454596B2 (en) | 2003-10-06 |
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