JP3431950B2 - Manufacturing method of metal shell for spark plug - Google Patents
Manufacturing method of metal shell for spark plugInfo
- Publication number
- JP3431950B2 JP3431950B2 JP16485093A JP16485093A JP3431950B2 JP 3431950 B2 JP3431950 B2 JP 3431950B2 JP 16485093 A JP16485093 A JP 16485093A JP 16485093 A JP16485093 A JP 16485093A JP 3431950 B2 JP3431950 B2 JP 3431950B2
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- forged product
- small
- head
- hole
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車等に搭載された
内燃機関に組み付けられるスパークプラグ用主体金具の
製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a metal shell for a spark plug which is mounted on an internal combustion engine mounted on an automobile or the like.
【０００２】[0002]
【従来の技術】従来より、ある種のガソリンエンジンに
おいては、シリンダヘッドに円形状の最大径筒部、この
最大径筒部より一端面側に最大径筒部より小さい外径で
六角形状の中径筒部、およびこの中径筒部より一端面側
に中径筒部より小さい外径で円形状の小径筒部（かしめ
部）が形成された主体金具を備えたスパークプラグを取
り付けている（例えばヨーロッパ特許第００３６０５０
号に開示された技術）。2. Description of the Related Art Conventionally, in some gasoline engines, a cylinder head has a circular maximum-diameter cylindrical portion, and one end face side of the maximum-diameter cylindrical portion has an outer diameter smaller than the maximum-diameter cylindrical portion and has a hexagonal shape. A spark plug having a diameter tubular portion and a metal shell formed with a circular small diameter tubular portion (caulking portion) having an outer diameter smaller than that of the medium diameter tubular portion on one end surface side of the medium diameter tubular portion is attached ( For example European Patent No. 0036050
Technology disclosed in.
【０００３】このスパークプラグ用主体金具は、以下の
製造方法により製造されていた。先ず、図６（ａ）に示
した形状に切断した金属素材ａを、冷間鍛造成形機の第
１ステーション（図示せず）にてすえ込み成形すること
により、図６（ｂ）に示したように、弾丸状の第１鍛造
品ｂを形成する。次に、冷間鍛造成形機の第２ステーシ
ョン（図示せず）にて第１鍛造品ｂを押出し成形するこ
とにより、図６（ｃ）に示したように、上端側に円形状
の頭部１０１、および下端側に円形状の脚部１０２を有
する第２鍛造品ｃを形成する。This spark plug metal shell was manufactured by the following manufacturing method. First, the metal material a cut into the shape shown in FIG. 6 (a) is swage-formed at the first station (not shown) of the cold forging machine to obtain the shape shown in FIG. 6 (b). Thus, a bullet-shaped first forged product b is formed. Next, by extruding the first forged product b at the second station (not shown) of the cold forging machine, as shown in FIG. 6C, a circular head portion is formed on the upper end side. 101, and a second forged product c having a circular leg portion 102 on the lower end side is formed.
【０００４】次に、冷間鍛造成形機の第３ステーション
１０３（図７参照）にて第２鍛造品ｃを押出し成形する
ことにより、図６（ｄ）に示したように、上端側に端面
に大穴１０４を設けた円形状の大径頭部１０５、および
下端側に端面に小穴１０６を設けた円形状の小径脚部１
０７を有する第３鍛造品ｄを形成する。なお、第３ステ
ーション１０３は、図７に示したように、パンチ１３
１、パンチホルダー１３２、ダイス１３３、マンドレル
（ピン）１３４およびキックアウトスリーブ１３５等か
ら構成されている。Next, by extruding the second forged product c at the third station 103 (see FIG. 7) of the cold forging machine, as shown in FIG. 6 (d), the end face is formed on the upper end side. A circular large-diameter head portion 105 having a large hole 104 formed therein and a small-diameter circular leg portion 1 having a small hole 106 provided at an end surface on the lower end side.
A third forging d having No. 07 is formed. It should be noted that the third station 103, as shown in FIG.
1, a punch holder 132, a die 133, a mandrel (pin) 134, a kickout sleeve 135, and the like.
【０００５】次に、冷間鍛造成形機の第４ステーション
（図示せず）にて第３鍛造品ｄを押出し成形することに
より、図６（ｅ）に示したように、上端側に端面に大穴
１１１を設けた円形状の大径頭部１１２、および下端側
に端面に小穴１１３を設けた円形状の小径脚部１１４を
有する第４鍛造品ｅを形成する。次に、冷間鍛造成形機
の第５ステーション（図示せず）にて第４鍛造品ｅを押
出し成形することにより、図６（ｆ）に示したように、
内部に貫通した軸穴１１６を有し、上端側に円形状の大
径筒部１１７、および下端側に円形状の小径管部１１８
を有する第５鍛造品ｆを形成する。Next, the third forged product d is extruded and molded at the fourth station (not shown) of the cold forging machine so that the end face is formed on the upper end side as shown in FIG. 6 (e). A fourth forged product e having a circular large-diameter head portion 112 provided with a large hole 111 and a circular small-diameter leg portion 114 provided with a small hole 113 on the lower end side is formed. Next, by extruding the fourth forged product e at the fifth station (not shown) of the cold forging machine, as shown in FIG. 6 (f),
It has a shaft hole 116 penetrating therethrough, a large-diameter cylindrical portion 117 on the upper end side, and a small-diameter tubular portion 118 on the lower end side.
Forming a fifth forged product f having
【０００６】次に、冷間鍛造成形機の第６ステーション
（図示せず）にて第５鍛造品ｆを押出し成形することに
より、図６（ｇ）に示したように、中央部に円形状の大
径筒部１２１、上端側に大径筒部１２１より小さい外径
で六角形状の六角筒部１２２、および下端側に円形状の
小径管部１２３を有する第６鍛造品ｇを形成する。これ
らの冷間鍛造加工により形成された第６鍛造品ｇの六角
筒部１２２の端面側などを切削機械により切削して、成
形品の端面に後工程でかしめられる小径筒部（かしめ
部）の外径を成形するようにしていた。Next, the fifth forged product f is extruded at the sixth station (not shown) of the cold forging machine to form a circular shape at the center as shown in FIG. 6 (g). A sixth forged product g having a large-diameter tubular portion 121, a hexagonal hexagonal tubular portion 122 having an outer diameter smaller than that of the large-diameter tubular portion 121 on the upper end side, and a circular small-diameter tubular portion 123 on the lower end side is formed. The end face side of the hexagonal tubular portion 122 of the sixth forged product g formed by these cold forging processes is cut by a cutting machine to form a small diameter tubular portion (caulked portion) which is caulked on the end face of the molded product in a later step. The outer diameter was molded.
【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、冷間鍛造加工後の切削加工時に小径筒
部の外径成形を行っているため、切削機械による切削量
が多くなり、第６鍛造品ｇの削り代が多くなるので、金
属素材の材料費が上昇し製造コストが上昇するという問
題点があった。さらに、切削加工時の切り屑の排出が多
いため、切削機械にからみつく切り屑が多く、この切り
屑を排除する作業に時間がかかり、切削機械の稼働率が
低下するという問題点があった。また、切削機械による
切削量が多いため、切削機械にかかる負荷が大きいの
で、切削機械から排出される完成品のピースタイムが長
くなり、切削機械の切り刃の寿命が短くなり、完成品の
精度が悪いという問題点があった。However, in the conventional manufacturing method, since the outer diameter of the small diameter cylindrical portion is formed at the time of cutting after cold forging, the cutting amount by the cutting machine increases, 6 Since the forged product g has a large cutting allowance, there is a problem that the material cost of the metal material increases and the manufacturing cost increases. Furthermore, since a large amount of chips are discharged during the cutting process, there are many chips clinging to the cutting machine, and it takes a long time to remove the chips, resulting in a decrease in the operating rate of the cutting machine. In addition, since the amount of cutting by the cutting machine is large, the load on the cutting machine is large, so the piece time of the finished product discharged from the cutting machine becomes longer, the life of the cutting blade of the cutting machine becomes shorter, and the accuracy of the finished product becomes shorter. There was a problem that was bad.
【０００８】そして、押出し成形でかしめ部を予備成形
するには、従来の冷間鍛造成形機の第３ステーション１
０３の前成形だけで六角筒部１２２の予備成形と共に一
度に行うことは不可能であったため、筒体の端面側にか
しめ部のみを形成する工程を新たに新設する必要があっ
た。このため、冷間鍛造加工の工程数を６工程より７工
程に増加した冷間鍛造成形機が必要となるので、冷間鍛
造成形機を新規のものに交換する必要があり製造コスト
が上昇するという問題点があった。Then, in order to preform the crimped portion by extrusion molding, the third station 1 of the conventional cold forging machine is used.
Since it was not possible to perform the preforming of the hexagonal tubular portion 122 at the same time only by preforming No. 03, it was necessary to newly install a step of forming only the caulking portion on the end face side of the tubular body. For this reason, since a cold forging machine having an increased number of steps of cold forging from 7 to 7 is required, it is necessary to replace the cold forging machine with a new one, which increases the manufacturing cost. There was a problem.
【０００９】本発明は、切削機械による切削加工時の切
削量を減少して削り代の量や切り屑の量の軽減化を図る
と共に、切削機械にかかる負荷の軽減化を図れ、冷間鍛
造成形機による冷間鍛造加工の工程数を増加させること
なく、小径筒部の外径成形を行えるスパークプラグ用主
体金具の製造方法の提供を目的とする。According to the present invention, the amount of cutting allowance and the amount of chips are reduced by reducing the amount of cutting at the time of cutting by a cutting machine, and the load applied to the cutting machine is reduced, and cold forging is performed. An object of the present invention is to provide a method for manufacturing a metal shell for a spark plug, which can form an outer diameter of a small-diameter cylindrical portion without increasing the number of cold forging steps by a forming machine.
【００１０】[0010]
【課題を解決するための手段】本発明は、冷間鍛造成形
機により冷間鍛造加工された鍛造品を、切削機械により
切削加工してスパークプラグ用主体金具を製造する製造
方法において、前記冷間鍛造加工は、以下の各工程から
なることを特徴とするスパークプラグ用主体金具の製造
方法である。
（ａ）円柱状の素材をすえ込み成形することにより、弾
丸状の第１鍛造品を形成する第１工程。
（ｂ）前記第１鍛造品を押出し成形することにより、一
端側に円形状の頭部、および他端側に前記頭部より小さ
い外径で円形状の脚部を有する第２鍛造品を形成する第
２工程。
（ｃ）前記第２鍛造品をすえ込み成形と押出し成形する
ことにより、前記頭部の端面に大径穴、前記頭部の脚部
側に前記頭部より大きい外径で円形状の大径頭部、およ
び前記頭部の端面側に前記大径頭部より小さい外径で円
形状の小径筒部、前記脚部側に前記大径頭部より小さい
外径で円形状の小径脚部を有する第３鍛造品を形成する
第３工程。
（ｄ）前記第３鍛造品を押出し成形することにより、前
記大径穴より更に小さい中径穴を成形し、同時に前記脚
部の端面に小径穴、および前記小径脚部を伸長した小径
管部を有する第４鍛造品を形成する第４工程。
（ｅ）前記第４鍛造品を打抜き成形することにより、前
記中径穴と前記小径穴とを連通して内部を軸方向に貫通
する貫通穴を有する第５鍛造品を形成する第５工程。
（ｆ）前記第５鍛造品を押出し成形することにより、前
記大径頭部の前記小径管部側に円形状の大径筒部、前記
大径頭部の前記小径筒部側に前記大径筒部より小さい外
径で非円形状の中径筒部を有する第６鍛造品を形成する
第６工程。
また、前記第３鍛造品を成形する第３工程で前記脚部の
端面に小径穴を形成しても良い。The present invention provides a manufacturing method for manufacturing a spark plug metal shell by cutting a forged product cold-forged by a cold forging machine by a cutting machine. The forging process is a method of manufacturing a metal shell for a spark plug, which comprises the following steps. (A) A first step of forming a bullet-shaped first forged product by upsetting a cylindrical material. (B) By extruding the first forged product, a second forged product having a circular head portion on one end side and a circular leg portion having an outer diameter smaller than the head portion on the other end side is formed. The second step to do. (C) By swaging and extruding the second forged product, a large-diameter hole is formed in the end face of the head, and a large-diameter circular shape with an outer diameter larger than the head on the leg side of the head. A head, and a circular small-diameter cylindrical portion having an outer diameter smaller than the large-diameter head on the end face side, and a circular small-diameter leg portion having an outer diameter smaller than the large-diameter head on the leg side. A third step of forming a third forged product having. (D) By extruding the third forged product, a medium diameter hole smaller than the large diameter hole is formed, and at the same time, a small diameter hole on the end face of the leg portion and a small diameter pipe portion obtained by extending the small diameter leg portion. A fourth step of forming a fourth forged product having. (E) A fifth step of forming the fifth forged product by punching and forming the fourth forged product so as to communicate the medium diameter hole and the small diameter hole and to have a through hole axially penetrating the inside. (F) By extruding the fifth forged product, a large-diameter cylindrical portion having a circular shape is formed on the small-diameter tube portion side of the large-diameter head portion, and the large-diameter portion is formed on the small-diameter cylindrical portion side of the large diameter head portion. A sixth step of forming a sixth forged product having a non-circular medium-diameter tubular portion with an outer diameter smaller than the tubular portion. Further, a small diameter hole may be formed in the end surface of the leg portion in the third step of forming the third forged product.
【００１１】[0011]
【作用】本発明によれば、冷間鍛造成形機による冷間鍛
造加工の第３工程にて、第２鍛造品をすえ込み成形と押
出し成形することによって、頭部より大きい外径で円形
状の大径頭部をすえ込み成形、および大径頭部より小さ
い外径で円形状の小径脚部の外径成形と同時に、頭部の
端面側に大径頭部より小さい外径で円形状の小径筒部が
押出し成形される。これにより、切削機械による切削加
工時の切削量が減るので、削り代の量や切り屑の量が軽
減すると共に、切削機械にかかる負荷が軽減され、ピー
スタイムが向上する。また、冷間鍛造成形機による冷間
鍛造加工の工程数を増加させることなく小径筒部の外径
が成形されるので、冷間鍛造成形機を新規のものに交換
する必要はない。According to the present invention, in the third step of the cold forging process by the cold forging machine, the second forged product is swaged and extruded so that the outer diameter is larger than that of the head. At the same time as swaging the large-diameter head and forming the circular small-diameter leg with an outside diameter smaller than the large-diameter head, the outside diameter smaller than the large-diameter head is rounded on the end face of the head. The small-diameter cylindrical portion of is extruded. As a result, the amount of cutting at the time of cutting by the cutting machine is reduced, so that the amount of cutting allowance and the amount of chips are reduced, the load on the cutting machine is reduced, and the piece time is improved. Further, since the outer diameter of the small-diameter tubular portion is molded without increasing the number of steps of cold forging processing by the cold forging machine, it is not necessary to replace the cold forging machine with a new one.
【００１２】[0012]
〔実施例の構成〕本発明のスパークプラグ用主体金具の
製造方法を図１ないし図４に示す一実施例に基づき説明
する。図１は主体金具の完成品形状を示した図で、図２
はその主体金具を組み付けたスパークプラグを示した図
である。スパークプラグ１は、筒状の絶縁碍子２、この
絶縁碍子２に保持された中心電極３、この中心電極３の
先端面との間に火花放電ギャップＧを形成する接地電極
４、およびこの接地電極４を保持する筒状の主体金具５
等を備えている。[Structure of Embodiment] A method for manufacturing a metal shell for a spark plug according to the present invention will be described based on an embodiment shown in FIGS. 1 to 4. Fig. 1 is a diagram showing the shape of the finished product of the metallic shell.
[Fig. 4] is a view showing a spark plug in which the metal shell is assembled. The spark plug 1 includes a cylindrical insulator 2, a center electrode 3 held by the insulator 2, a ground electrode 4 that forms a spark discharge gap G between the center electrode 3 and a tip end surface of the center electrode 3, and the ground electrode. Cylindrical metal shell 5 holding 4
And so on.
【００１３】絶縁碍子２は、ＡｌＮ、Ａｌ2 Ｏ3 等のセ
ラミックス焼結体により成形されている。この絶縁碍子
２の内部には、先端面および後端面で開口している軸方
向の内孔６が形成されている。この絶縁碍子２の先端側
の内孔６には中心電極３が嵌め込まれており、後端側の
内孔６には端子電極７の一部および抵抗体８が導電性ガ
ラス粉末９により加熱封着されている。また、絶縁碍子
２の中央部の段部１０はパッキン１１を介して主体金具
５の中央部分に係止され、絶縁碍子２の中央部の最大径
部１２はリング１３およびセラミックス充填粉末１４を
介して主体金具５の後端部分に係止されている。The insulator 2 is formed of a ceramic sintered body such as AlN or Al 2 O 3 . Inside the insulator 2, an axial inner hole 6 that is open at the front end surface and the rear end surface is formed. The center electrode 3 is fitted in the inner hole 6 on the front end side of the insulator 2, and a part of the terminal electrode 7 and the resistor 8 are heat-sealed by the conductive glass powder 9 in the inner hole 6 on the rear end side. It is worn. Further, the step portion 10 in the central portion of the insulator 2 is locked to the central portion of the metal shell 5 via the packing 11, and the maximum diameter portion 12 in the central portion of the insulator 2 is interposed by the ring 13 and the ceramic filling powder 14. And is locked to the rear end portion of the metal shell 5.
【００１４】中心電極３は、先端面が内孔６より突出し
た状態で内孔６内に嵌め込まれることによって絶縁碍子
２に保持されている。接地電極４は、ニッケル−クロム
−鉄合金やニッケル−マンガン−シリコン合金等の耐熱
性導電金属が使用されている。この接地電極４は、主体
金具５の先端面に溶接された後に、端部が中心電極３の
先端面に対向配置するように略Ｌ字状に折曲げられる。The center electrode 3 is held in the insulator 2 by being fitted into the inner hole 6 with the tip end surface protruding from the inner hole 6. The ground electrode 4 is made of a heat-resistant conductive metal such as nickel-chromium-iron alloy or nickel-manganese-silicon alloy. The ground electrode 4 is welded to the tip surface of the metal shell 5 and then bent into a substantially L shape so that the end portion is arranged to face the tip surface of the center electrode 3.
【００１５】主体金具５は、低炭素鋼（Ｓ１０Ｃ、Ｓ１
７Ｃ）等の切削加工容易な導電性金属素材を冷間鍛造成
形機にて冷間鍛造加工した後に切削機械にて切削加工す
ることにより、図１に示した形状に形成される。この主
体金具５は、絶縁碍子２の外周に嵌め合わされて、後端
部分のかしめ部１５を内側にかしめることにより絶縁碍
子２を支持している。この主体金具５の略中央部には、
内燃機関のシリンダヘッド（図示せず）とのシール面を
なす円形状の大径筒部１７が形成されている。この大径
筒部１７より先端側の小径管部１６の外周には、大径筒
部１７より小さい外径のねじ部１８が形成されている。
このねじ部１８は内燃機関のシリンダヘッドに取り付け
るためのものである。The metal shell 5 is made of low carbon steel (S10C, S1).
A conductive metal material such as 7C) which is easy to cut is cold forged by a cold forging machine and then cut by a cutting machine to form the shape shown in FIG. The metal shell 5 is fitted to the outer circumference of the insulator 2 and supports the insulator 2 by caulking the caulking portion 15 at the rear end portion inside. In the substantially central part of the metal shell 5,
A circular large-diameter cylindrical portion 17 forming a sealing surface with a cylinder head (not shown) of the internal combustion engine is formed. A threaded portion 18 having an outer diameter smaller than that of the large-diameter tubular portion 17 is formed on the outer circumference of the small-diameter tubular portion 16 on the tip side of the large-diameter tubular portion 17.
The screw portion 18 is for attaching to a cylinder head of an internal combustion engine.
【００１６】そして、主体金具５の大径筒部１７より後
端側の外周には、大径筒部１７より小さい外径で六角形
状の六角筒部１９が形成されている。六角筒部１９は締
付け用のレンチ等の工具をかけるためのものである。ま
た、大径筒部１７と六角筒部１９との間には、切削加工
により薄肉にされた肉薄筒部２０が形成されている。そ
して、主体金具５の先端側の内部には、軸方向に貫通す
る貫通穴２１が形成されている。この貫通穴２１は、図
１に示したように、先端側に小径穴２２、後端側に小径
穴２２より内径の大きい大径穴２３、中央部に最小穴２
４と中径穴２５を有している。なお、小径管部１６の内
周には、絶縁碍子２の中央部の段部１０をパッキン１１
を介して係止する内周突条部２６が形成されている。A hexagonal hexagonal tubular portion 19 having an outer diameter smaller than that of the large diameter tubular portion 17 is formed on the outer periphery of the metallic shell 5 on the rear end side of the large diameter tubular portion 17. The hexagonal tube portion 19 is for applying a tool such as a tightening wrench. Further, between the large-diameter tubular portion 17 and the hexagonal tubular portion 19, a thin-walled tubular portion 20 thinned by cutting is formed. A through hole 21 is formed inside the metallic shell 5 on the front end side so as to penetrate in the axial direction. As shown in FIG. 1, the through-hole 21 has a small-diameter hole 22 on the front end side, a large-diameter hole 23 having a larger inner diameter than the small-diameter hole 22 on the rear end side, and a minimum hole 2 at the center.
4 and a medium diameter hole 25. In addition, on the inner circumference of the small-diameter pipe portion 16, the step portion 10 at the center of the insulator 2 is packed.
An inner peripheral protruding portion 26 is formed to be locked via.
【００１７】図３は冷間鍛造成形機の第３ステーション
を示した図である。この第３ステーション２７の可動型
２８には、大穴内径を予備成形するためのパンチ２９、
このパンチ２９を軸方向に保持するパンチスリーブ３
０、およびかしめ部外径を予備成形するためのパンチホ
ルダー３１等が組み付けられている。また、第３ステー
ション２７の固定型３２には、大径筒部外径とねじ部外
径を予備成形するためのダイス３３、小穴内径を予備成
形するためのマンドレル３４、冷間鍛造加工の第３工程
終了後に第３鍛造品ｄを上方へ排出するためのキックア
ウトスリーブ３５等が組み付けられている。FIG. 3 is a view showing a third station of the cold forging machine. The movable die 28 of the third station 27 has a punch 29 for preforming a large hole inner diameter,
Punch sleeve 3 for holding this punch 29 in the axial direction
0, and a punch holder 31 and the like for preforming the outer diameter of the crimped portion are assembled. Further, the fixed die 32 of the third station 27 includes a die 33 for preforming the outer diameter of the large diameter cylindrical portion and the outer diameter of the screw portion, a mandrel 34 for preforming the inner diameter of the small hole, and a cold forging first die. A kick-out sleeve 35 or the like for discharging the third forged product d upward after the completion of the three steps is assembled.
【００１８】〔実施例の製造方法〕次に、この実施例の
主体金具５の製造方法を図１ないし図４に基づき説明す
る。先ず、図４（ａ）に示したように、例えば低炭素鋼
よりなる直径φ１４．８の円柱状金属素材ａを所定の長
さに切断する。[Manufacturing Method of Embodiment] Next, a manufacturing method of the metal shell 5 of this embodiment will be described with reference to FIGS. 1 to 4. First, as shown in FIG. 4A, a cylindrical metal material a having a diameter φ14.8 made of, for example, low carbon steel is cut into a predetermined length.
【００１９】（冷間鍛造加工の第１工程）次に、円柱状
金属素材ａを冷間鍛造成形機の第１ステーション（図示
せず）内に挿入して、すえ込み成形することにより円柱
状金属素材ａより大きい外径（例えばφ１５．１）で円
形状の弾丸状の第１鍛造品ｂを得る。なお、図４（ｂ）
に示したように、第１鍛造品ｂの下端面には小穴２１１
が成形され、また下端面の外周縁には円弧状のコーナー
２１２が成形される。(First Step of Cold Forging) Next, the columnar metal material a is inserted into the first station (not shown) of the cold forging machine and swage-formed to form a columnar shape. A circular bullet-shaped first forged product b having an outer diameter larger than the metal material a (for example, φ15.1) is obtained. Note that FIG. 4 (b)
As shown in, the small hole 211 is formed on the lower end surface of the first forged product b.
Is formed, and an arc-shaped corner 212 is formed on the outer peripheral edge of the lower end surface.
【００２０】（冷間鍛造加工の第２工程）次に、第１鍛
造品ｂを冷間鍛造成形機の第２ステーション（図示せ
ず）内に挿入して、押出し成形することにより第２鍛造
品ｃを得る。なお、図４（ｃ）に示したように、第２鍛
造品ｃの上端面には大穴２２１が成形され、下端面には
小穴２２２が成形される。また、第２鍛造品ｃには、上
端側に第１鍛造品ｂより大きい外径（例えばφ１５．４
８）で円形状の頭部２２３、下端側に頭部２２３より小
さい外径で円形状の脚部２２４が成形される。そして、
頭部２２３と脚部２２４との間には段部２２５が成形さ
れる。(Second Step of Cold Forging) Next, the first forged product b is inserted into the second station (not shown) of the cold forging machine and extruded to form the second forging. Obtain the product c. As shown in FIG. 4C, a large hole 221 is formed on the upper end surface of the second forged product c, and a small hole 222 is formed on the lower end surface thereof. Further, the second forged product c has an outer diameter larger than the first forged product b on the upper end side (for example, φ15.4).
In 8), a circular head portion 223 and a circular leg portion 224 having an outer diameter smaller than that of the head portion 223 are formed on the lower end side. And
A step 225 is formed between the head 223 and the leg 224.
【００２１】（冷間鍛造加工の第３工程）次に、第２鍛
造品ｃを、図３に示したように、冷間鍛造成形機の第３
ステーション２７内に挿入して、パンチ２９、パンチホ
ルダー３１、ダイス３３およびマンドレル３４を用いて
すえこみ成形（アプセット成形）と押出し成形すること
により第３鍛造品ｄを得る。なお、図４（ｄ）に示した
ように、第３鍛造品ｄの上端面には大径穴２３１内径が
予備成形され、下端面には小径穴２３２内径が予備成形
される。また、第３鍛造品ｄの頭部２３３側には、第２
鍛造品ｃの頭部２２３より大きい外径（例えばφ１８．
９）で円形状の大径頭部２３４（例えば軸方向寸法１
０．１mm）、つまり大径筒部１７外径が予備成形され
る。そして、第３鍛造品ｄの頭部２３３の上端面側には
大径頭部２３４より小さい外径（例えばφ１５．５６）
で円形状の小径筒部２３５（例えば軸方向寸法２．７m
m）、つまりかしめ部１５外径が予備成形される。さら
に、第３鍛造品ｄの脚部２３６側には、大径頭部２３４
より小さい外径で円形状の小径脚部２３７、つまりねじ
部１８外径が予備成形される。なお、下端面の小径穴２
３２はプラグ品番のうち高熱価プラグには必要でなく設
けなくても良い。(Third Step of Cold Forging) Next, as shown in FIG. 3, the second forged product c is processed by the third step of the cold forging machine.
The third forged product d is obtained by inserting it into the station 27 and performing upset molding (upset molding) and extrusion molding using the punch 29, punch holder 31, die 33 and mandrel 34. As shown in FIG. 4D, the inner diameter of the large diameter hole 231 is preformed on the upper end surface of the third forged product d, and the inner diameter of the small diameter hole 232 is preformed on the lower end surface thereof. In addition, on the head 233 side of the third forged product d, a second
An outer diameter larger than the head 223 of the forged product c (for example, φ18.
9) a circular large-diameter head 234 (for example, axial dimension 1
0.1 mm), that is, the outer diameter of the large diameter cylindrical portion 17 is preformed. Then, on the upper end surface side of the head 233 of the third forged product d, an outer diameter smaller than the large-diameter head 234 (for example, φ15.56)
And circular small-diameter cylindrical part 235 (for example, axial dimension 2.7 m
m), that is, the outer diameter of the crimped portion 15 is preformed. Further, on the leg 236 side of the third forged product d, a large diameter head 234
The circular small diameter leg portion 237 having a smaller outer diameter, that is, the outer diameter of the screw portion 18 is preformed. In addition, the small diameter hole 2 on the lower end surface
32 is not necessary for the high heat value plug of the plug part numbers and may not be provided.
【００２２】（冷間鍛造加工の第４工程）次に、第３鍛
造品ｄを冷間鍛造成形機の第４ステーション（図示せ
ず）内に挿入して、押出し成形することにより第４鍛造
品ｅを得る。なお、図４（ｅ）に示したように、第４鍛
造品ｅの上端面には、第３鍛造品ｄの大径穴２３１より
小さい中径穴２４１が成形され、下端面には、第３鍛造
品ｄの小径穴２３２を伸長した小径穴２４２が形成され
る。また、第４鍛造品ｅの下端側には、第３鍛造品ｄの
小径脚部２３７を伸長した小径管部２４３が成形され
る。(Fourth Step of Cold Forging) Next, the third forged product d is inserted into the fourth station (not shown) of the cold forging machine and extruded to form the fourth forged product. Obtain the product e. As shown in FIG. 4 (e), an intermediate diameter hole 241 smaller than the large diameter hole 231 of the third forged product d is formed on the upper end surface of the fourth forged product e, and a A small diameter hole 242 is formed by extending the small diameter hole 232 of the 3 forged product d. Further, on the lower end side of the fourth forged product e, a small diameter tube portion 243 obtained by extending the small diameter leg portion 237 of the third forged product d is formed.
【００２３】（冷間鍛造加工の第５工程）次に、第４鍛
造品ｅを冷間鍛造成形機の第５ステーション（図示せ
ず）内に挿入して、打抜き成形することにより第５鍛造
品ｆを得る。なお、図４（ｆ）に示したように、第５鍛
造品ｆの中径穴２４１と小径穴２４２とを連通して内部
を軸方向に貫通する貫通穴２５３が成形される。(Fifth Step of Cold Forging) Next, the fourth forged product e is inserted into the fifth station (not shown) of the cold forging machine and punched to form the fifth forged product. Obtain the product f. As shown in FIG. 4 (f), a through hole 253 is formed which communicates the medium diameter hole 241 and the small diameter hole 242 of the fifth forged product f and penetrates the inside in the axial direction.
【００２４】（冷間鍛造加工の第６工程）第５鍛造品ｆ
を冷間鍛造成形機の第６ステーション（図示せず）内に
挿入して、押出し成形することにより第６鍛造品ｇを得
る。なお、図４（ｇ）に示したように、第６鍛造品ｇの
頭部２６１の小径脚部２６２側に円形状の大径筒部２６
３が成形される。また、第６鍛造品ｇの頭部２６１の小
径筒部２６４（例えば外径寸法φ１５．５６、軸方向寸
法２．７mm）側に大径筒部２６３より小さい外径（例え
ばφ１８．９７）で六角形状の六角筒部２６５（本発明
の中径筒部：例えば軸方向寸法９mm）外径が成形され
る。(Sixth Step of Cold Forging) Fifth Forged Product f
Is inserted into the sixth station (not shown) of the cold forging machine and extrusion molded to obtain a sixth forged product g. As shown in FIG. 4 (g), the circular large-diameter cylindrical portion 26 is provided on the small-diameter leg portion 262 side of the head 261 of the sixth forged product g.
3 is molded. In addition, an outer diameter smaller than the large-diameter cylindrical portion 263 (for example, φ18.97) on the small-diameter cylindrical portion 264 (for example, outer diameter dimension φ15.56, axial dimension 2.7 mm) side of the head 261 of the sixth forged product g. The outer diameter of the hexagonal hexagonal tubular portion 265 (the medium diameter tubular portion of the present invention: for example, the axial dimension of 9 mm) is molded.
【００２５】（切削加工）冷間鍛造加工により形成され
た第６鍛造品ｇは、図１に示したように、大径筒部１７
より小さい外径の小径管部１６の外周にねじ部１８をね
じ転造し、かしめ部１５、大径筒部１７および肉薄筒部
２０などの外径切削や、小径穴２２の内径切削すること
により主体金具５が製造される。そして、この主体金具
５の先端面には、棒状の接地電極４が溶接により接合さ
れて図１の完成品形状となる。(Cutting) As shown in FIG. 1, the sixth forged product g formed by cold forging has a large-diameter cylindrical portion 17
Threading a threaded portion 18 on the outer circumference of a small-diameter pipe portion 16 having a smaller outer diameter, and cutting the outer diameter of the caulking portion 15, the large-diameter tubular portion 17, the thin-walled tubular portion 20, etc., and the inner diameter of a small-diameter hole 22. The metal shell 5 is manufactured by the above. Then, the rod-shaped ground electrode 4 is joined to the tip end surface of the metal shell 5 by welding to obtain the finished product shape shown in FIG.
【００２６】（組付工程）そして、以上のような冷間鍛
造加工および切削加工により製造された主体金具５の内
部に、図２に示したように、中心電極３を内包した絶縁
碍子２を貫通穴２１内に嵌め込んでかしめ部１５を内側
にかしめる。すると、絶縁碍子２の中央部の最大径部１
２がリング１３およびセラミックス充填粉末１４を介し
て主体金具５のかしめ部１５により係止されると共に、
絶縁碍子２の中央部の段部１０がパッキン１１を介して
主体金具５の内周突条部２６により係止される。これに
より、主体金具５内に絶縁碍子２等が組付けられること
によってスパークプラグ１が製造される。(Assembling Step) Then, as shown in FIG. 2, inside the metal shell 5 manufactured by the cold forging process and the cutting process as described above, the insulator 2 including the center electrode 3 is incorporated. It fits in the through hole 21 and the caulking portion 15 is caulked inward. Then, the maximum diameter portion 1 at the center of the insulator 2
2 is locked by the caulking portion 15 of the metal shell 5 via the ring 13 and the ceramics filling powder 14, and
The step portion 10 at the center of the insulator 2 is locked by the inner circumferential protruding portion 26 of the metal shell 5 via the packing 11. As a result, the spark plug 1 is manufactured by assembling the insulator 2 and the like inside the metal shell 5.
【００２７】〔実施例の効果〕以上のように、この実施
例では、冷間鍛造成形機による冷間鍛造加工の第３ステ
ーション２７にてすえこみ成形と押出し成形（小径脚部
２３７の成形）を用いることによって、第３鍛造品ｄの
頭部２３３の小径脚部２３７側に円形状の大径頭部２３
４（大径筒部１７）外径を予備成形すると同時に、頭部
２３３の端面側に大径頭部２３４より小さい外径で円形
状の小径筒部２３５（主体金具５のかしめ部１５）外径
が同時に予備成形することができる。[Effects of Embodiment] As described above, in this embodiment, upset molding and extrusion molding (molding of the small-diameter leg portion 237) at the third station 27 of cold forging processing by the cold forging machine. By using the circular large diameter head 23 on the small diameter leg 237 side of the head 233 of the third forged product d.
4 (large-diameter cylindrical portion 17) is preformed at the outer diameter, and at the same time, the outside of the small-diameter cylindrical portion 235 (caulking portion 15 of the metallic shell 5) having a smaller outer diameter than the large-diameter head portion 234 is provided on the end face side of the head portion 233. The diameter can be preformed simultaneously.
【００２８】これにより、かしめ部１５の外周切削時の
削り代を減少することができるので、切削機械による切
削量を減少することができ、従来のものより切り屑の量
を減少させることができる。したがって、円柱状金属素
材ａの切断寸法を短縮でき、材料費を軽減できるので、
製造コストや製品コストを低下させることができる。さ
らに、切削加工時の切り屑の量を減少できるため、切り
屑を切削機械より排出するための排出作業の作業性を改
善できるので、切削機械の稼働率を向上させることがで
きる。また、切削加工時の切削機械にかかる負荷を軽減
することができるため、切削機械から排出される主体金
具５の完成品（図１の接地電極４のないもの）のピース
タイムを短縮でき、切削機械の切り刃の長寿命化を達成
でき、完成品の精度も向上できる。As a result, the cutting allowance at the time of cutting the outer periphery of the caulked portion 15 can be reduced, so that the amount of cutting by the cutting machine can be reduced and the amount of chips can be reduced as compared with the conventional one. . Therefore, the cutting size of the cylindrical metal material a can be shortened, and the material cost can be reduced.
Manufacturing cost and product cost can be reduced. Furthermore, since the amount of chips during cutting can be reduced, the workability of the discharge work for discharging the chips from the cutting machine can be improved, so that the operating rate of the cutting machine can be improved. Further, since the load applied to the cutting machine at the time of cutting can be reduced, the piece time of the finished product (without the ground electrode 4 of FIG. 1) of the metal shell 5 discharged from the cutting machine can be shortened, and the cutting The life of the cutting edge of the machine can be extended and the accuracy of the finished product can be improved.
【００２９】そして、冷間鍛造成形機による冷間鍛造加
工の工程数を増加させることなく、第３ステーション２
７の一部の変更にて小径筒部２３５外径、つまり主体金
具５のかしめ部１５外径を予備成形することができるの
で、冷間鍛造成形機を新規のものを購入する必要はな
く、製造コストや製品コストをさらに低下させることが
できる。Then, without increasing the number of steps of cold forging by the cold forging machine, the third station 2
Since the outer diameter of the small-diameter cylindrical portion 235, that is, the outer diameter of the caulking portion 15 of the metal shell 5 can be preformed by changing a part of 7, it is not necessary to purchase a new cold forging machine. The manufacturing cost and product cost can be further reduced.
【００３０】〔変形例〕本実施例では、本発明を大径筒
部１７より小さい外径の六角筒部１９を備えた主体金具
５の製造方法に使用したが、冷間鍛造加工の後の切削加
工にて大径筒部２６３（図４参照）の外周を切削して、
図５に示したように、円形状の大径胴部４１を形成し、
その外径を六角筒部１９の六角対角の寸法＞大径胴部４
１の外径＞六角筒部１９の六角対辺の寸法に収まるよう
にしたスパークプラグ用主体金具５の製造方法に使用し
ても良い。また、冷間鍛造加工終了時に、大径筒部の外
径＞六角筒部の外径＞小径筒部の外径という関係を満た
していれば大径筒部、六角筒部、小径筒部の外径や軸方
向寸法を自由に変更できる。[Modification] In the present embodiment, the present invention is used in the method for manufacturing the metal shell 5 having the hexagonal tube portion 19 having an outer diameter smaller than that of the large-diameter tube portion 17, but after the cold forging process, By cutting the outer periphery of the large-diameter cylindrical portion 263 (see FIG. 4) by cutting,
As shown in FIG. 5, a large-diameter body 41 having a circular shape is formed,
The outer diameter of the hexagonal tubular portion 19 is the dimension of the hexagonal diagonal> the large-diameter body portion 4
The outer diameter of 1> the hexagonal tubular portion 19 may be used in a method of manufacturing the metal shell 5 for a spark plug that fits within the dimension of the opposite side of the hexagon. At the end of cold forging, if the relationship of outer diameter of large diameter cylinder> outer diameter of hexagonal cylinder> outer diameter of small diameter cylinder is satisfied, large diameter cylinder, hexagonal cylinder, small diameter cylinder The outer diameter and axial dimension can be changed freely.
【００３１】[0031]
【発明の効果】本発明は、大径頭部の外径成形および小
径脚部の外径成形と同時に小径筒部の外径成形を行うこ
とができるため、切削機械による切削加工時の切削量を
減少でき、且つ削り代の量や切り屑の量を減少できる。
これにより、切削機械にかかる負荷を軽減することがで
き、ピースタイムが向上することができる。また、冷間
鍛造成形機による冷間鍛造加工の工程数を６工程から７
工程に増加させることなく小径筒部外径を成形すること
ができるので、製造コストや製品コストを低下させるこ
とができる。According to the present invention, since it is possible to perform the outer diameter forming of the large diameter head portion and the small diameter leg portion at the same time as the outer diameter forming of the small diameter cylindrical portion, the cutting amount at the time of cutting by the cutting machine is performed. And the amount of cutting allowance and the amount of chips can be reduced.
As a result, the load on the cutting machine can be reduced, and the peace time can be improved. Also, the number of cold forging processes by the cold forging machine can be changed from 6 to 7
Since the outer diameter of the small-diameter cylindrical portion can be molded without increasing the number of steps, the manufacturing cost and the product cost can be reduced.
【図１】本発明の一実施例にかかる主体金具の完成品形
状を示した半断面図である。FIG. 1 is a half sectional view showing a shape of a finished product of a metal shell according to an embodiment of the present invention.
【図２】図１の主体金具を組み付けたスパークプラグを
示した断面図である。FIG. 2 is a cross-sectional view showing a spark plug assembled with the metal shell of FIG.
【図３】冷間鍛造成形機の第３ステーションの主要部を
示した断面図である。FIG. 3 is a sectional view showing a main part of a third station of the cold forging machine.
【図４】本発明の一実施例にかかる切断と第１〜第６鍛
造品形状を示した断面図である。FIG. 4 is a cross-sectional view showing cutting and first to sixth forged product shapes according to an embodiment of the present invention.
【図５】本発明にかかる主体金具の完成品形状の変形例
を示した半断面図である。FIG. 5 is a half sectional view showing a modified example of the shape of the finished product of the metal shell according to the present invention.
【図６】従来の各冷間鍛造加工における切断と第１〜第
６鍛造品形状を示した断面図である。FIG. 6 is a cross-sectional view showing cutting in each conventional cold forging process and shapes of first to sixth forged products.
【図７】従来の冷間鍛造成形機の第３ステーションの主
要部を示した断面図である。FIG. 7 is a sectional view showing a main part of a third station of a conventional cold forging machine.
１ スパークプラグ ５ 主体金具 １５ かしめ部 １６ 小径管部 １７ 大径筒部 １８ ねじ部 １９ 六角筒部 ２１ 貫通穴 ２２ 小径穴 ２３ 大径穴 ２３１ 大径穴 ２３２ 小径穴 ２３３ 頭部 ２３４ 大径頭部 ２３５ 小径筒部 ２３６ 脚部 ２３７ 小径脚部 ２６３ 大径筒部 ２６４ 小径筒部 ２６５ 六角筒部（中径筒部） ｂ 第１鍛造品 ｃ 第２鍛造品 ｄ 第３鍛造品 ｅ 第４鍛造品 ｆ 第５鍛造品 ｇ 第６鍛造品 1 spark plug 5 metal shell 15 Caulking part 16 Small diameter pipe 17 Large diameter tube 18 screw part 19 Hexagonal tube 21 through hole 22 Small hole 23 Large hole 231 Large diameter hole 232 small diameter hole 233 head 234 Large diameter head 235 Small Diameter Tube 236 legs 237 small diameter leg 263 Large diameter cylinder 264 small diameter cylinder 265 Hexagonal tube (medium diameter tube) b 1st forged product c Second forged product d Third forged product e Fourth forged product f 5th forged product g 6th forged products
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B21J 1/00 - 13/14 B21J 17/00 - 19/04 B21K 1/00 - 31/00 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) B21J 1/00-13/14 B21J 17/00-19/04 B21K 1/00-31/00
Claims (2)
た鍛造品を、切削機械により切削加工してスパークプラ
グ用主体金具を製造する製造方法において、 前記冷間鍛造加工は、 （ａ）円柱状の素材をすえ込み成形することにより、弾
丸状の第１鍛造品を形成する第１工程と、 （ｂ）前記第１鍛造品を押出し成形することにより、一
端側に円形状の頭部、および他端側に前記頭部より小さ
い外径で円形状の脚部を有する第２鍛造品を形成する第
２工程と、 （ｃ）前記第２鍛造品をすえ込み成形と押出し成形する
ことにより、 前記頭部の端面に大径穴、前記頭部の脚部側に前記頭部
より大きい外径で円形状の大径頭部、および前記頭部の
端面側に前記大径頭部より小さい外径で円形状の小径筒
部、前記脚部側に前記大径頭部より小さい外径で円形状
の小径脚部を有する第３鍛造品を形成する第３工程と、 （ｄ）前記第３鍛造品を押出し成形することにより、前
記大径穴より更に小さい中径穴を成形し、同時に前記脚
部の端面に小径穴、および前記小径脚部を伸長した小径
管部を有する第４鍛造品を形成する第４工程と、 （ｅ）前記第４鍛造品を打抜き成形することにより、前
記中径穴と前記小径穴とを連通して内部を軸方向に貫通
する貫通穴を有する第５鍛造品を形成する第５工程と、 （ｆ）前記第５鍛造品を押出し成形することにより、前
記大径頭部の前記小径管部側に円形状の大径筒部、前記
大径頭部の前記小径筒部側に前記大径筒部より小さい外
径で非円形状の中径筒部を有する第６鍛造品を形成する
第６工程とからなることを特徴とするスパークプラグ用
主体金具の製造方法。1. A manufacturing method for manufacturing a metal shell for a spark plug by cutting a forged product cold-forged by a cold forging machine with a cutting machine, wherein the cold forging includes: A first step of forming a bullet-shaped first forged product by swaging a cylindrical material; and (b) extruding the first forged product to form a circular head on one end side. And a second step of forming a second forged product having a circular leg portion having an outer diameter smaller than the head portion on the other end side, and (c) swaging and extruding the second forged product. By the large diameter hole on the end surface of the head, a large diameter circular head with an outer diameter larger than the head on the leg side of the head, and from the large diameter head on the end surface side of the head. Circular small-diameter cylindrical part with small outer diameter, with outer diameter smaller than the large-diameter head on the leg side A third step of forming a third forged product having a small-diameter leg portion of a shape; and (d) extruding the third forged product to form a medium-diameter hole smaller than the large-diameter hole, and at the same time A fourth step of forming a fourth forged product having a small diameter hole in the end face of the leg portion and a small diameter pipe portion obtained by extending the small diameter leg portion; and (e) punching and molding the fourth forged product A fifth step of forming a fifth forged product having a through hole that axially penetrates the inside by communicating the small diameter hole with the small diameter hole; (f) by extruding the fifth forged product, A circular large-diameter tubular portion on the small-diameter tube portion side of the large-diameter head, and a non-circular medium-diameter tubular portion having an outer diameter smaller than the large-diameter tubular portion on the small-diameter tubular portion side of the large-diameter head portion. And a sixth step of forming a sixth forged product having the spark plug metal shell manufacturing process. Law.
製造方法において、 前記第３鍛造品を成形する第３工程で前記脚部の端面に
小径穴を形成してなることを特徴とするスパークプラグ
用主体金具の製造方法。2. The spark plug metal shell manufacturing method according to claim 1, wherein a small diameter hole is formed in an end surface of the leg portion in a third step of forming the third forged product. Manufacturing method of metal shell for plugs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16485093A JP3431950B2 (en) | 1993-07-02 | 1993-07-02 | Manufacturing method of metal shell for spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16485093A JP3431950B2 (en) | 1993-07-02 | 1993-07-02 | Manufacturing method of metal shell for spark plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0716693A JPH0716693A (en) | 1995-01-20 |
| JP3431950B2 true JP3431950B2 (en) | 2003-07-28 |
Family
ID=15801110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16485093A Expired - Lifetime JP3431950B2 (en) | 1993-07-02 | 1993-07-02 | Manufacturing method of metal shell for spark plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3431950B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823117A (en) * | 2009-03-03 | 2010-09-08 | 日本特殊陶业株式会社 | Spark plug is with the manufacture method of metal-back and be used to make the mould of this metal-back |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000124887A (en) | 1998-10-14 | 2000-04-28 | Fuji Xerox Co Ltd | Enciphering/decoding method for group unit, and method and device for signature |
| JP4147704B2 (en) * | 1999-10-21 | 2008-09-10 | 株式会社デンソー | Manufacturing method of metal shell for spark plug |
| JP2002011543A (en) * | 2000-06-30 | 2002-01-15 | Ngk Spark Plug Co Ltd | Manufacturing method of cylindrical metal piece |
| JP2003019538A (en) | 2001-07-04 | 2003-01-21 | Denso Corp | Method for manufacturing main piece for spark plug |
| KR100426334B1 (en) * | 2002-04-03 | 2004-04-08 | 주식회사 대우화스너 | manufacturing method of nipple for the wheel |
| DE602004012002T2 (en) | 2003-01-21 | 2009-02-19 | NGK Spark Plug Co., Ltd., Nagoya-shi | A manufacturing method of a metallic housing for a spark plug, method of manufacturing a spark plug with a metallic housing and spark plug made therewith |
| KR101218591B1 (en) * | 2011-01-18 | 2013-01-04 | 김봉한 | Forming method for outlet part of injection pump |
| JP5444306B2 (en) * | 2011-10-31 | 2014-03-19 | 日本特殊陶業株式会社 | Method for manufacturing spark plug metal shell and method for manufacturing spark plug |
| JP6109709B2 (en) * | 2013-03-15 | 2017-04-05 | 日本特殊陶業株式会社 | Manufacturing method by cold forging of different diameter cylindrical molded body, and manufacturing method of metal shell for gas sensor |
| JP6313673B2 (en) * | 2014-06-27 | 2018-04-18 | 日本特殊陶業株式会社 | Fitting manufacturing method, spark plug manufacturing method, and sensor manufacturing method |
| KR101670798B1 (en) * | 2014-12-22 | 2016-11-09 | 서영정밀주식회사 | A Method for Manufacturing a Piston of Caliper Housing for a Ball in Ramp Brake System Using Precision Forging Process |
| CN105562575B (en) * | 2015-12-01 | 2017-12-22 | 余姚市菲龙金属制品有限公司 | The processing method of electric heater blowdown plug cold-heading |
-
1993
- 1993-07-02 JP JP16485093A patent/JP3431950B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823117A (en) * | 2009-03-03 | 2010-09-08 | 日本特殊陶业株式会社 | Spark plug is with the manufacture method of metal-back and be used to make the mould of this metal-back |
| CN101823117B (en) * | 2009-03-03 | 2013-07-10 | 日本特殊陶业株式会社 | Method of producing metallic shell for spark plug and die for producing the metallic shell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0716693A (en) | 1995-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3431950B2 (en) | Manufacturing method of metal shell for spark plug | |
| US7914353B2 (en) | Spark plug and method for manufacturing the same | |
| US6357274B1 (en) | Sparkplug manufacturing method | |
| US4684352A (en) | Method for producing a composite spark plug center electrode | |
| US9643238B2 (en) | Manufacturing method of metal shell formed body for spark plug, manufacturing method of metal shell for spark plug, and spark plug manufacturing method | |
| US8322184B2 (en) | Method of producing metallic shell for spark plug | |
| JP4220218B2 (en) | Manufacturing method of center electrode for spark plug | |
| JPH0620577B2 (en) | Method for manufacturing spark plug terminal nut by plastic working | |
| JP3471410B2 (en) | Manufacturing method of metal shell for spark plug | |
| US10828686B2 (en) | Method for manufacturing cylindrical body having different diameters by cold forging | |
| EP1353044A2 (en) | Method of manufacturing a poppet valve | |
| US6792786B2 (en) | Fabrication method of metal shell of spark plug | |
| US7172483B2 (en) | Method of making metallic shell for spark plug, method of making spark plug having metallic shell and spark plug produced by the same | |
| EP0691479A1 (en) | Blind rivet assembly | |
| JP2020202111A (en) | Manufacturing method of tubular metal fitting | |
| JP4342289B2 (en) | Method for manufacturing spark plug metal shell and method for manufacturing spark plug | |
| EP1158245A1 (en) | Glow plug for diesel engines and process for its manufacture | |
| JPH0446652A (en) | Manufacture of main fitting | |
| JP2965360B2 (en) | Manufacturing method of metal shell for glow plug | |
| JPH021585B2 (en) | ||
| JP2005238243A (en) | Method for manufacturing main metallic body for spark plug | |
| JPH0420714A (en) | Manufacture of main metallic member for glow plug | |
| JPH06338379A (en) | Manufacture of multi-pole spark plug | |
| CN2586268Y (en) | Spark plug | |
| JPH11197769A (en) | Production of port fitting for hose |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080523 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110523 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110523 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120523 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120523 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130523 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130523 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140523 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term |