JP2904612B2 - Method for manufacturing spark plug metal shell - Google Patents
Method for manufacturing spark plug metal shellInfo
- Publication number
- JP2904612B2 JP2904612B2 JP15041391A JP15041391A JP2904612B2 JP 2904612 B2 JP2904612 B2 JP 2904612B2 JP 15041391 A JP15041391 A JP 15041391A JP 15041391 A JP15041391 A JP 15041391A JP 2904612 B2 JP2904612 B2 JP 2904612B2
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- head
- small
- forging
- cylindrical
- 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
Landscapes
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、円柱頭部と該頭部よ
り径大の六角胴部を有するスパークプラグ主体金具の製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a spark plug main body having a cylindrical head and a hexagonal body having a diameter larger than the head.
【０００２】[0002]
【従来の技術】自動車レース用など過酷な使用がなされ
る高出力エンジンには、図３に示すごとく、径小の首部
を介して円柱頭部と径大の六角胴部とが設けられるとと
もに、胴部からは径小の脚部が延長され、脚部外周には
エンジンへの取り付けねじが形成されたスパークプラグ
主体金具１００を備えたスパークプラグＰが使用され
る。この種の主体金具は従来切削加工を主体に製造され
ていたが、製造コストを低減させるため、切削加工をで
きるだけ簡潔化し、生産性に優れる圧造加工に拠り製造
することが望ましい。2. Description of the Related Art As shown in FIG. 3, a high-power engine used for severe use such as for automobile racing is provided with a cylindrical head and a large-diameter hexagonal body via a small-diameter neck. A small-diameter leg is extended from the body, and a spark plug P having a spark plug main metal fitting 100 formed with an attachment screw to an engine is used on the outer periphery of the leg. Conventionally, this type of metal shell has been manufactured mainly by cutting. However, in order to reduce the manufacturing cost, it is desirable to simplify the cutting as much as possible and manufacture it by means of forging, which is excellent in productivity.
【０００３】[0003]
【発明が解決しようとする課題】素材を圧造により成形
する場合、生産性を向上させ、ダイの寿命を長持ちさ
せ、かつ整形度および強度の高い製品を得るためには、
パンチに必要な加圧力が小さく、圧造工程における素材
の変形量が過大でなく、成形時の変形に無理がないこと
が重要である。この発明の目的は、形の整った製品の圧
造を主体とする製造方法により量産するのに適したスパ
ークプラグ主体金具の製造方法の提供にある。In the case of molding a material by forging, in order to improve the productivity, prolong the life of the die, and obtain a product having a high degree of shaping and strength,
It is important that the pressing force required for the punch is small, the amount of deformation of the material in the forging process is not excessive, and the deformation during molding is reasonable. An object of the present invention is to provide a method of manufacturing a spark plug main metal fitting suitable for mass-producing a shaped product mainly by forging.
【０００４】[0004]
【課題を解決するための手段】この発明のスパークプラ
グ主体金具の製造方法は、パンチとダイとにより構成さ
れた複数の圧造ステーションで、円柱状素材を順次段階
的に圧造加工し、最終圧造品を切削加工することによ
り、一端側が円柱頭部、中間が径小の首部を介して前記
頭部に隣接する径大の六角胴部、他端側が前記胴部にフ
ランジ面を介して連なる径小の脚部となっている筒状の
スパークプラグ主体金具の製造方法であって、所定の圧
造ステーションにおいて、円柱状の素材を圧造し、一端
側を端面にテーパー部を有する凹所を持つ径大の頭部、
他端側を径小の円柱状脚部、中間を両者の連結部とした
初期成形品を圧造し、つぎの圧造ステーションにおい
て、前記一端側の凹所の底面を押圧して、前記頭部およ
び連結部を軸径方向に押し出すことにより、六角部と、
径小の脚部と、両者を連結するフランジ面を成形し、つ
ぎの圧造ステーションにおいて、前記六角部の一端側外
周を径小の円筒に成形して中空の円筒頭部と、該円筒頭
部より径大の六角胴部とを成形し、その後の圧造ステー
ションにおいて、前記凹所の底面および他端側の端面を
押圧して中空部を脚部中間にまで成形し、さらに打抜き
により貫通させ最終圧造品を成形し、しかる後、切削に
より、頭部と六角胴部との間に径小の首部、頭部の端に
薄肉のかしめ部、脚部外周にねじを形成することを特徴
とする。SUMMARY OF THE INVENTION A method of manufacturing a spark plug main metal fitting according to the present invention is to sequentially forge a columnar material stepwise at a plurality of forging stations constituted by punches and dies, thereby forming a final forged product. By cutting, one end side is a cylindrical head, the middle is a large-diameter hexagonal body adjacent to the head via a small-diameter neck, and the other end is connected to the body via a flange surface with a small diameter. A method for manufacturing a cylindrical spark plug main body metal fitting which is a leg portion of a large diameter having a recess having a tapered portion on one end side at a predetermined forging station by forging a cylindrical material. Head,
The other end side is a small diameter cylindrical leg portion, forging an initial molded product having the middle portion as a connecting portion between them, and at the next forging station, pressing the bottom surface of the recess at the one end side, the head and By extruding the connecting part in the shaft radial direction, a hexagonal part,
Forming a small-diameter leg and a flange surface for connecting the two, and forming an outer periphery of one end of the hexagonal portion into a small-diameter cylinder at a next forging station; A hexagonal body with a larger diameter is formed, and at the subsequent forging station, the bottom surface of the recess and the end surface on the other end side are pressed to form a hollow portion to the middle of the leg portion, and further penetrated by punching to finalize. Forming a forged product and then forming a small diameter neck between the head and the hexagonal body, a thin caulked portion at the end of the head, and a screw around the leg by cutting. .
【０００５】[0005]
【作用および発明の効果】この発明のスパークプラグ主
体金具の製造方法は、一端側に六角筒部を成形してお
き、次にこの六角筒部の一端側外周を押出成形により、
内径が同一径に保ったまま外径を径小の円柱に成形し
て、円柱頭部と、該円柱頭部より径大の六角胴部とを形
成しているので、圧縮移動する材料の変位量が小さく、
かつ変形が無理なくなされるため、形の整った製品を圧
造により量産するのに好適である。According to the method for manufacturing a spark plug metallic shell of the present invention, a hexagonal cylinder is formed at one end, and then the outer periphery of the hexagonal cylinder is extruded at one end.
Since the outer diameter is formed into a small-diameter cylinder while maintaining the same inner diameter, a cylinder head and a hexagonal body having a diameter larger than the cylinder head are formed. The amount is small,
In addition, since the deformation is easily performed, it is suitable for mass-producing a well-formed product by forging.
【０００６】[0006]
【実施例】図１は、この発明にかかるスパークプラグ主
体金具の製造方法を実行するための多段式圧造成形機の
概略構成を示す。圧造成形機Ａは、機台の所定位置に固
定されたダイブロックＤと、このダイブロックＤに向か
って前進、後退（図示上下動）するラムＲとを有する。
ダイブロックＤの前面には、複数のダイＤ１〜Ｄ８がそ
れぞれダイホルダにより保持されて並設固定されてい
る。ラムＲの前面には、上記ダイＤ１〜Ｄ８に対向して
複数のパンチＰ１〜Ｐ６がそれぞれパンチホルダに保持
されて並列固定されている。これら相対向する各パンチ
Ｐ１〜Ｐ６とダイＤ１〜Ｄ８とにより複数の圧造ステー
ションＩ〜ＩＶが構成されている。FIG. 1 shows a schematic configuration of a multi-stage press forming machine for executing a method for manufacturing a spark plug metal shell according to the present invention. The forging machine A has a die block D fixed at a predetermined position on the machine base, and a ram R which moves forward and backward (moves up and down in the figure) toward the die block D.
On the front surface of the die block D, a plurality of dies D1 to D8 are respectively held and fixed side by side by die holders. On the front surface of the ram R, a plurality of punches P1 to P6 are respectively held by a punch holder and fixed in parallel to face the dies D1 to D8. These opposing punches P1 to P6 and dies D1 to D8 form a plurality of forging stations I to IV.
【０００７】主体金具１００は、上記圧造成形機Ａによ
りつぎのように順次段階的に圧造加工される。図１に示
すごとく、所定寸法に切断され、初期圧造加工された円
柱形状の素材１を、図示しない素材移送手段により順次
圧造ステーションＩ〜ＶＩにおいて圧造し、最終圧造ス
テーションＶＩにおいて切削加工前のスパークプラグ主
体金具１００の圧造品が成形される。The metal shell 100 is forged by the forging machine A sequentially and stepwise as follows. As shown in FIG. 1, a columnar material 1 cut to a predetermined size and subjected to initial forging is successively forged at forging stations I to VI by a material transfer means (not shown), and then is subjected to a spark before cutting at a final forging station VI. A forged product of the plug main body 100 is formed.
【０００８】圧造ステーションＩにおいて、スチールか
ら切断されて円柱状の素材を図２のに示したごとく、
パンチＰ１とダイＤ１により両端の芯出し穴を形成し円
柱状の整形素材１を圧造する。圧造ステーションＩＩに
おいて、円柱状の素材１を、図２のに示すごとく、パ
ンチＰ２とダイＤ２により一端側が端面に外周部がテー
パー面２１となっている凹所２２を有する径大部２３、
他端側が端面に凹所２４を有する径小部２５、中間が連
結部２６となっている初期成形品２を圧造する。At the forging station I, a columnar material cut from steel is formed as shown in FIG.
Centering holes at both ends are formed by the punch P1 and the die D1, and the cylindrical shaping material 1 is forged. In the heading station II, as shown in FIG. 2, the cylindrical material 1 is formed into a large-diameter portion 23 having a recess 22 having one end formed on the end face and an outer peripheral portion formed as a tapered surface 21 by a punch P2 and a die D2.
An initial molded product 2 having a small-diameter portion 25 having a concave portion 24 at the other end and a connecting portion 26 at the middle is forged.
【０００９】圧造ステーションＩＩＩにおいて、初期成
形品２をパンチＰ３とダイＤ３及びダイＤ４とにより、
前記一端側の凹所２２の底面を押圧して、前記連結部２
６を円環状平面のフランジ面３６に成形して、図２の
に示すごとく、前記フランジ面３６に到る円径断面の凹
所３２を備えた六角筒部３３、径小の円柱状脚部３５、
および中間のフランジ面３６を有する中間成形品３を圧
造する。In the forging station III, the initial molded product 2 is formed by the punch P3 and the dies D3 and D4.
By pressing the bottom surface of the recess 22 on one end side, the connecting portion 2
6 is formed on a flange surface 36 of an annular flat surface, as shown in FIG. 2, a hexagonal tube portion 33 provided with a recess 32 having a circular cross section reaching the flange surface 36, and a small-diameter cylindrical leg portion. 35,
And an intermediate molded product 3 having an intermediate flange surface 36.
【００１０】圧造ステーションＩＶにおいて、中間成形
品３を逆転して、ダイＤ５に挿入すると共に、パンチＰ
４とダイＤ５とにより、前記六角筒部３３の一端側部分
の外周を押出成形し、外周を径小の円筒に成形して、円
筒頭部４３と、内径が同一径で、前記円筒頭部４３より
径大の六角胴部４７とを形成する。これにより、図２の
に示す、一端側に円柱状の凹所４２を有し、円筒頭部
４３、該頭部より径大の六角胴部４７、該胴部４７とフ
ランジ面４６を介して連なる径小の円柱状脚部４５とか
らなる中間成形品４が圧造される。In the forging station IV, the intermediate molded product 3 is reversed and inserted into the die D5, and the punch P
4 and a die D5, the outer periphery of the one end side portion of the hexagonal cylinder portion 33 is extruded, and the outer periphery is molded into a small-diameter cylinder. A hexagonal body 47 having a diameter larger than 43 is formed. Thereby, as shown in FIG. 2, a cylindrical concave portion 42 is provided on one end side, and a cylindrical head 43, a hexagonal body portion 47 having a diameter larger than the head portion, and the The intermediate molded product 4 comprising the continuous small-diameter cylindrical leg 45 is forged.
【００１１】圧造ステーションＶにおいて、中間成形品
４を戻転して、ダイＤ６及びダイＤ７に支持し、径小の
パンチＰ５により、前記凹所４２の底面と、脚部４５の
端面の凹所４４の底面とを押圧する。これにより、凹所
４２を脚部４５にまで深くし、段付きの凹所５２を形成
するとともに、他端面に深い凹所５４を有する、図２の
に示すごとく中間成形品５を圧造する。最終ステーシ
ョンＶＩにおいて、ダイＤ８に支持して、パンチＰ６に
より、凹所５２の底面を押圧して貫通させ、円柱頭部６
３と、該頭部より径大の六角胴部６７と、フランジ面６
６と、径小の脚部６５とを備えた筒状の最終圧造品６を
成形する。At the forging station V, the intermediate molded product 4 is turned back and supported on the dies D6 and D7, and the bottom of the recess 42 and the recess on the end face of the leg 45 are held by the small-diameter punch P5. 44 and the bottom surface. As a result, the recess 42 is deepened to the leg portion 45 to form the stepped recess 52, and the intermediate molded product 5 having the deep recess 54 on the other end surface as shown in FIG. 2 is forged. At the last station VI, the bottom of the recess 52 is pressed and penetrated by the punch P6 while being supported by the die D8.
3, a hexagonal trunk 67 having a diameter larger than that of the head,
6 and a cylindrical final product 6 having small-diameter legs 65 are formed.
【００１２】この最終圧造品６は、切削加工により胴部
６７に近接する外周に径小の首部１１を設けるととも
に、円柱頭部６３の後端部外周を削り、肉薄のかしめ部
１２を形成し、さらに脚部６５にねじ１３を刻設し、図
３に示すスパークプラグ主体金具１００を製造する。In the final forged product 6, a small-diameter neck portion 11 is provided on the outer periphery close to the body portion 67 by cutting, and the outer periphery of the rear end portion of the cylindrical head 63 is shaved to form a thin caulked portion 12. Then, the screw 13 is engraved on the leg portion 65 to manufacture the spark plug main body 100 shown in FIG.
【００１３】次に、この発明の別の実施例を説明する。
上述の図１の圧造ステーションＩＶにおいては、中間成
形品３を逆転して、六角筒部３３の一端側部分の外周
を、円筒頭部４３と内径が同一径で前記円筒頭部４３よ
り径大の六角胴部４７とを形成したが、この発明は、図
４に示すように、中間成形品３を逆転することなくスリ
ーブＤ１０とＤ１１及びダイＤ９に支持し、パンチＰ７
を凹所３２に保持しながらダイＤ９を押圧すことによ
り、上記と同様に中間成形品４を圧造することができ
る。この加工の場合、中間成形品３の逆転作用がないの
で、成形品の飛出しが生じることなく、より高速化が達
成できる利点がある。Next, another embodiment of the present invention will be described.
In the forging station IV of FIG. 1 described above, the intermediate molded product 3 is reversed, and the outer circumference of the one end side portion of the hexagonal cylinder portion 33 has the same inner diameter as the cylindrical head 43 and is larger than the cylindrical head 43. In the present invention, as shown in FIG. 4, the intermediate molded product 3 is supported on the sleeves D10 and D11 and the die D9 without reversing, and a punch P7 is formed.
By pressing the die D9 while holding in the recess 32, the intermediate molded product 4 can be forged in the same manner as described above. In the case of this processing, since there is no reversing action of the intermediate molded product 3, there is an advantage that the speed can be increased without the molded product jumping out.
【図１】この発明のスパークプラグ主体金具の製造方法
に用いられる多段式圧造成形機の概略構成断面図であ
る。FIG. 1 is a schematic sectional view of a multi-stage press forming machine used in a method for manufacturing a spark plug metal shell according to the present invention.
【図２】この発明のスパークプラグ主体金具の圧造工程
における素材、中間成形品、および最終圧造品の一部断
面図である。FIG. 2 is a partial cross-sectional view of a raw material, an intermediate molded product, and a final forged product in a forging process of the spark plug main body of the present invention.
【図３】スパークプラグの断面図である。FIG. 3 is a sectional view of a spark plug.
【図４】この発明の別の実施例を示すスパークプラグ主
体金具の製造方法を示す概略構成断面図である。FIG. 4 is a schematic cross-sectional view showing a method for manufacturing a spark plug metal shell showing another embodiment of the present invention.
１ 素材 ２ 初期成形品 ３ 中間成形品 ４ 中間成形品 ５ 中間成形品 ６ 最終圧造品 Ａ 圧造成形機 Ｄ ダイブロック Ｒ ラム Ｄ１〜Ｄ９ ダイ Ｐ１〜Ｐ７ パンチ Ｄ１０、１１ スリーブ １００ スパークプラグ主体金具 Reference Signs List 1 material 2 initial molded product 3 intermediate molded product 4 intermediate molded product 5 intermediate molded product 6 final forged product A forged molding machine D die block R ram D1 to D9 die P1 to P7 punch D10, 11 sleeve 100 spark plug main metal fitting
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B21K 1/00 - 31/00 B21J 1/00 - 13/14 B21J 17/00 - 19/04 B24B 19/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 6 , DB name) B21K 1/00-31/00 B21J 1/00-13/14 B21J 17/00-19/04 B24B 19 / 00
Claims (1)
圧造ステーションで、円柱状素材を順次段階的に圧造加
工し、最終圧造品を切削加工することにより、一端側が
円柱頭部、中間が径小の首部を介して前記頭部に隣接す
る径大の六角胴部、他端側が前記胴部にフランジ面を介
して連なる径小の脚部となっている筒状のスパークプラ
グ主体金具の製造方法であって、所定の圧造ステーショ
ンにおいて、円柱状の素材を圧造し、一端側を端面にテ
ーパー部を有する凹所を持つ径大の頭部、他端側を径小
の円柱状脚部、中間を両者の連結部とした初期成形品を
圧造し、つぎの圧造ステーションにおいて、前記一端側
の凹所の底面を押圧して、前記頭部および連結部を軸径
方向に押し出すことにより、六角部と、径小の脚部と、
両者を連結するフランジ面を成形し、つぎの圧造ステー
ションにおいて、前記六角部の一端側外周を径小の円筒
に成形して中空の円筒頭部と、該円筒頭部より径大の六
角胴部とを成形し、その後の圧造ステーションにおい
て、前記凹所の底面および他端側の端面を押圧して中空
部を脚部中間にまで成形し、さらに打抜きにより貫通さ
せ最終圧造品を成形し、しかる後、切削により、頭部と
六角胴部との間に径小の首部、頭部の端に薄肉のかしめ
部、脚部外周にねじを形成することを特徴とするスパー
クプラグ主体金具の製造方法。1. A plurality of forging stations constituted by a punch and a die, stepwise forging a cylindrical material in a stepwise manner, and cutting a final forged product so that one end side is a cylindrical head and the middle is a diameter. Manufacture of a cylindrical spark plug metal shell having a large-diameter hexagonal body adjacent to the head via a small neck and small-diameter legs connected to the body via a flange surface at the other end side. A method, in a predetermined forging station, forging a cylindrical material, a large-diameter head having a concave portion having a tapered portion on one end side, a small-diameter cylindrical leg portion on the other end side, At the next forging station, press the bottom surface of the recess at the one end side to extrude the head and the connecting portion in the axial direction, thereby forming a hexagonal shape. Part, small diameter leg,
A flange surface connecting the two is formed, and at the next forging station, the outer periphery of one end of the hexagonal portion is formed into a small-diameter cylinder, and a hollow cylindrical head and a hexagonal trunk having a larger diameter than the cylindrical head are formed. In the subsequent forging station, the bottom and the other end face of the recess are pressed to form the hollow portion to the middle of the leg portion, and further punched to form a final forged product. Thereafter, a method for manufacturing a metal shell for a spark plug, characterized by forming a small-diameter neck portion between the head and the hexagonal body portion, a thin caulked portion at the end of the head, and a screw around the leg portion by cutting. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15041391A JP2904612B2 (en) | 1991-06-21 | 1991-06-21 | Method for manufacturing spark plug metal shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15041391A JP2904612B2 (en) | 1991-06-21 | 1991-06-21 | Method for manufacturing spark plug metal shell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04371336A JPH04371336A (en) | 1992-12-24 |
| JP2904612B2 true JP2904612B2 (en) | 1999-06-14 |
Family
ID=15496402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15041391A Expired - Lifetime JP2904612B2 (en) | 1991-06-21 | 1991-06-21 | Method for manufacturing spark plug metal shell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2904612B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117583486A (en) * | 2024-01-19 | 2024-02-23 | 江苏国强兴晟能源科技股份有限公司 | Self-adaptive anti-offset necking machine for octal pipe necking |
-
1991
- 1991-06-21 JP JP15041391A patent/JP2904612B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04371336A (en) | 1992-12-24 |
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