JPH0688088B2 - Anvil electrode for electric upsetter - Google Patents
Anvil electrode for electric upsetterInfo
- Publication number
- JPH0688088B2 JPH0688088B2 JP62214389A JP21438987A JPH0688088B2 JP H0688088 B2 JPH0688088 B2 JP H0688088B2 JP 62214389 A JP62214389 A JP 62214389A JP 21438987 A JP21438987 A JP 21438987A JP H0688088 B2 JPH0688088 B2 JP H0688088B2
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- JP
- Japan
- Prior art keywords
- anvil electrode
- electrode
- rod
- anvil
- shaped material
- 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.)
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- Forging (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はエンジンバルブ等の据込み成形に用いる電気ア
プセッター用アンビル電極に関する。Description: TECHNICAL FIELD The present invention relates to an anvil electrode for an electric upsetter used in upsetting of an engine valve or the like.
（従来の技術） 棒状素材を通電加熱するとともに加圧することで所定の
形状に据込み成形する電気アプセッターは特開昭62−34
642号等で知られている。(Prior Art) An electric upsetter for upsetting a rod-shaped material into a predetermined shape by electrically heating and pressurizing it is disclosed in JP-A-62-34.
Known as No. 642.
即ち電気アプセッターは、第４図に示すように環状電極
100に棒状素材101を挿通してその先端をアンビル電極10
2に突き当て、これら環状電極101の先端に通電して加熱
し、この通電加熱に併行して棒状素材101をアンブル電
極102に向って押圧して棒状素材101のうち加熱によって
軟化した部分103をエンジンバルブ等の所定形状に据込
み成形するようにしたものである。That is, the electric upsetter has an annular electrode as shown in FIG.
Insert the rod-shaped material 101 into 100 and attach the tip to the anvil electrode 10
2, the tip of these annular electrodes 101 is energized and heated, and in parallel with this energization and heating, the rod-shaped material 101 is pressed toward the amble electrode 102 to press the portion 103 of the rod-shaped material 101 that has been softened by heating. It is designed to be upset into a predetermined shape such as an engine valve.
上記アンビル（anvil）は、いわゆる金敷（かなしき）
や鍛造用の台と同意である。また、アプセッターは据込
み鍛造を意味する。The anvil is a so-called anvil.
It is synonymous with a forging base. Upsetter means upset forging.
アンビル電極の材質は、従来、銅合金、合金鋼、ステン
レス鋼、耐熱鋼であった。Conventionally, the material of the anvil electrode has been copper alloy, alloy steel, stainless steel, and heat resistant steel.
（発明が解決しようとする問題点） ところで、最近の自動車用エンジンは高性能化の要求が
強く、動弁系の軽量化を目的として、より細い軸径のバ
ルブを用いる傾向があり、そのためバルブの材料として
はInconel,Nimonic,Hastelloy,Waspaloy等の難成形の耐
熱超合金を使用しなければならない。(Problems to be solved by the invention) By the way, recent automobile engines are strongly required to have high performance, and there is a tendency to use a valve having a smaller shaft diameter for the purpose of reducing the weight of a valve train. Inconel, Nimonic, Hastelloy, Waspaloy and other heat-resistant superalloys that are difficult to form must be used as the material.
斯かる耐熱超合金を電気アプセッターで据込み成形する
場合に、耐熱超合金の棒材をCu−CrやCu−Be等の銅合金
からなるアンビル電極に突き当てた場合には、アンビル
電極が局部的に摩耗するという不都合がある。When upsetting the heat-resistant superalloy with an electric upsetter, when the bar of the heat-resistant superalloy is struck against the anvil electrode made of a copper alloy such as Cu-Cr or Cu-Be, the anvil electrode is locally There is an inconvenience of abrasion.
また、銅合金は熱伝導性が良好であるために、アンビル
電極102を介して棒状素材101の熱が逃げ、部分的な熱ひ
けをおこす。すると、第４図に示すようにシワ104を生
じやすく、この傾向はバルブの場合、軸径（ｄ）（第２
図参照）に対する傘径（Ｄ）（第２図参照）の比（D/
d）が大なる程強くなるため、これがバルブ設計の自由
度を制限している。Further, since the copper alloy has good thermal conductivity, the heat of the rod-shaped material 101 escapes via the anvil electrode 102, causing a partial heat sink. Then, as shown in FIG. 4, wrinkles 104 are likely to occur, and this tendency tends to occur in the case of a valve, where the shaft diameter (d) (second
Ratio (D /) of umbrella diameter (D) (see Fig. 2) to (See Fig.)
This limits the freedom of valve design because d) becomes stronger.
そこで、アプセッティングヘッドの表面をアンビル電極
の部分を残してマイカやセラミックスの如き絶縁体で覆
う技術が米国第2,647,979号として開示されている。し
かしながらこの様な手段では、アンビル電極自身の摩耗
については何ら解決されない。Therefore, US Pat. No. 2,647,979 discloses a technique of covering the surface of the upsetting head with an insulator such as mica or ceramics while leaving the anvil electrode portion. However, such means does not solve the wear of the anvil electrode itself.
そこで、改良された従来の技術が、特公昭48−43026号
公報「２本の金属管の端部へ同時に厚肉部を形成する方
法」で提案されている。即ち、２本の管体の先端を中間
電極に押圧して塑性変形させるもので、前記中間電極は
ニッケル、クローム、モリブデンを主成分とする合金で
あり、この合金の両側面に、クローム、タングステン、
カーボン、鉄を主成分とする合金層（以下「耐熱層」と
いう）を付設して耐熱性を付与するとともに、外周縁に
溝を刻設し、この周溝に絶縁材を介して電熱線を巻きつ
ける構成となっている。Therefore, an improved conventional technique is proposed in Japanese Examined Patent Publication No. 48-43026, "Method for simultaneously forming a thick wall portion at the end portions of two metal tubes". That is, the tips of the two pipes are pressed against the intermediate electrode to be plastically deformed. The intermediate electrode is an alloy containing nickel, chrome, and molybdenum as main components, and chrome and tungsten are provided on both side surfaces of the alloy. ,
An alloy layer containing carbon and iron as main components (hereinafter referred to as "heat-resistant layer") is attached to provide heat resistance, and a groove is formed on the outer peripheral edge, and a heating wire is provided in the peripheral groove through an insulating material. It is configured to be wrapped.
上記耐熱層は、鋼種が規定されていないが、耐熱の点で
前記成分の最上位鋼種は鉄基耐熱合金（例えば19−19D
L、その成分はCr＝18.5％、Ｗ＝1.35％、Ni＝９％、Ｃ
＝0.32％、Mo＝1.40％、Nb＝0.4％、Ti＝0.25％、Fe＝
残部）である。しかし、この鉄基耐熱合金をアンビル電
極にしても期待される寿命は得られなかった。The heat-resistant layer is not specified in steel type, but in terms of heat resistance, the highest-grade steel type of the above components is an iron-based heat-resistant alloy (for example, 19-19D).
L, the components are Cr = 18.5%, W = 1.35%, Ni = 9%, C
= 0.32%, Mo = 1.40%, Nb = 0.4%, Ti = 0.25%, Fe =
The rest). However, even if this iron-based heat-resistant alloy was used as an anvil electrode, the expected life could not be obtained.
そこで、本発明の目的は難成形の耐熱超合金性エンジン
バルブを繰返し成形するに好適なアンビル電極を提供す
ることにある。Therefore, an object of the present invention is to provide an anvil electrode suitable for repeatedly molding a heat-resistant superalloy engine valve that is difficult to mold.
（問題を解決するための手段及び作用） 先ず本発明者らは、アプセッターの際に棒状素材101に
シワ104の寄る不都合が熱伝導度に起因していることに
着目し、各種材料の熱伝導率を比較検討することから始
めた。(Means and Actions for Solving Problems) First, the present inventors focused on the fact that the inconvenience of wrinkles 104 on the rod-shaped material 101 at the time of upsetting is due to the thermal conductivity, and the thermal conductivity of various materials was considered. We started by comparing the rates.
表１は各種材料の熱伝導率一覧表である。Table 1 is a list of thermal conductivity of various materials.
表１から明らかなように、SUS304又はNi/Cr系耐熱合金
は銅合金に比べて格段に熱伝導率が小さいので、熱ひけ
を防止する点で効果が期待できる。 As is clear from Table 1, SUS304 or Ni / Cr heat-resistant alloy has a remarkably lower thermal conductivity than copper alloy, and therefore, an effect can be expected in preventing heat sink.
そこで、本発明者らは、表１からSUS304又はNi/Cr系耐
熱合金をアンビル電極に採用することとし、これらSUS3
04又はNi/Cr系耐熱合金中のどれがよりアンビル電極に
適しているかを検討し、アプセッターの際に、棒状素材
の先端は1000〜1100℃になり、これに当接しているアン
ビル電極の成形面も高温に晒され且つ高温下において繰
返し押圧力が作用することから、クリープラプチャー強
さの大きな材料が有望であると考えるに至った。Therefore, the present inventors decided from Table 1 to adopt SUS304 or a Ni / Cr heat-resistant alloy for the anvil electrode.
We examined which of 04 or Ni / Cr heat-resistant alloys was more suitable for anvil electrodes, and when the upsetter, the tip of the rod-shaped material reached 1000 to 1100 ° C, and the anvil electrode that was in contact with this was formed. Since the surface is also exposed to a high temperature and the pressing force acts repeatedly at a high temperature, it has been considered that a material having a high creep rupture strength is promising.
第３図は各種材料のクリープラプチャー強さを示すグラ
フであり、横軸は温度（℃）、縦軸は1000時間クリープ
ラプチャー強さ（kg/mm2）であり、この1000時間クリー
プラプチャー強さ、一定温度（横軸の温度）のもとで一
定時間（この場合は1000時間）でクリープ破断する時の
応力（kg/mm2）である。Fig. 3 is a graph showing the creep rupture strength of various materials, where the horizontal axis is temperature (° C) and the vertical axis is 1000 hour creep rupture strength (kg / mm 2 ). , Stress (kg / mm 2 ) when creep ruptures at a constant time (1000 hours in this case) at a constant temperature (temperature on the horizontal axis).
グラフに掲げた1000時間クリープラプチャー強さは、各
種便覧に記載されているデータを引用したものである。
図によれば、Inconel 713はSUS304や19−9DLに比べてク
リープラプチャー強さが格段に大きい。The 1000 hour creep rupture strength shown in the graph is based on the data described in various handbooks.
According to the figure, Inconel 713 has significantly higher creep rupture strength than SUS304 and 19-9DL.
そこで、これらInconel 713、SUS304及び19−9DLの比較
実験を次の「実施例」の項に記載の通り実施した。Therefore, comparative experiments of these Inconel 713, SUS304 and 19-9DL were carried out as described in the following "Examples" section.
その結果、本発明は、アンビル電極を、Ni基耐熱超合金
の一種であるInconel 713で構成し且つ鋳造後に直ちに
水冷焼入れすることで製造したことを特徴とする。As a result, the present invention is characterized in that the anvil electrode is made of Inconel 713, which is a kind of Ni-based heat-resistant superalloy, and manufactured by water quenching immediately after casting.
なお、Inconel 713Cの合金組成は重量％で、Ni＝72.0
％,Cr＝12.5％,Mo＝4.2％,Al＝6.1％,Ti＝0.8％,Fe〈2.
5％,Mn〈0.25％,Si≦0.50％,C＝0.12％,B＝0.012％,Zr
＝0.10％及びNb＝2.0％である。The alloy composition of Inconel 713C is% by weight, Ni = 72.0
%, Cr = 12.5%, Mo = 4.2%, Al = 6.1%, Ti = 0.8%, Fe 〈2.
5%, Mn 〈0.25%, Si ≦ 0.50%, C = 0.12%, B = 0.01%, Zr
= 0.10% and Nb = 2.0%.
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Below, the Example of this invention is described based on an accompanying drawing.
第１図は本発明に係るアンビル電極を適用した電気アプ
セッター装置の概略図であり、電気アプセッター装置
は、棒状素材１をクランプする環状電極２と、棒状素材
１の先端を受けるアンビル電極３と、このアンビル電極
３の成形面3aにシリンダユニット４の作用で棒状素材１
を押付ける加圧パンチ５とから構成される。FIG. 1 is a schematic diagram of an electric upsetter device to which an anvil electrode according to the present invention is applied. The electric upsetter device includes an annular electrode 2 that clamps a rod-shaped material 1, an anvil electrode 3 that receives the tip of the rod-shaped material 1, The rod-shaped material 1 is applied to the forming surface 3a of the anvil electrode 3 by the action of the cylinder unit 4.
And a pressure punch 5 for pressing.
前記アンビル電極３は、材質がNi基耐熱超合金の一種で
あるInconel 713C（Ni＝72.0％,Cr＝12.5％,Mo＝4.2％,
Al＝6.1％,Ti＝0.8％,Fe〈2.5％,Mn〈0.25％,Si≦0.50
％,C＝0.12％,B＝0.012％,Zr＝0.10％及びNb＝2.0％）
であり、材料を鋳造した後、高温固相状態から直ちに水
冷焼入れすることで製造されたものである。上記水冷焼
入れすれば、空冷や放冷に比べて組織が緻密になる。The anvil electrode 3 is made of Inconel 713C (Ni = 72.0%, Cr = 12.5%, Mo = 4.2%, which is a kind of Ni-based heat-resistant superalloy).
Al = 6.1%, Ti = 0.8%, Fe 〈2.5%, Mn 〈0.25%, Si ≦ 0.50
%, C = 0.12%, B = 0.102%, Zr = 0.10% and Nb = 2.0%)
That is, it is manufactured by casting the material and immediately quenching it from the high temperature solid state with water. If the above water-cooled quenching is performed, the structure becomes denser as compared with air cooling or standing cooling.
以上の構成からなる電気アプセッター装置の作動を説明
する。The operation of the electric upsetter device having the above configuration will be described.
処理するべき棒状素材１は、エンジンバルブ素材であ
り、具体的にはInconel,Nimonic,Hastelley,Waspaloy等
の難成形の耐熱超合金である。The rod-shaped material 1 to be treated is an engine valve material, specifically, a hard-to-form heat resistant superalloy such as Inconel, Nimonic, Hastelley, Waspaloy.
この棒状素材１に環状電極２を嵌合し、先端を本発明の
アンビル電極３の成形面3aに当接し、後端を加圧パンチ
５に当接する。The ring-shaped electrode 2 is fitted to the rod-shaped material 1, the tip end is brought into contact with the molding surface 3a of the anvil electrode 3 of the present invention, and the rear end is brought into contact with the pressure punch 5.
シリンダユニット４を作動して、棒状素材１を強く成形
面3aに押圧しつつ、環状電極２とアンビル電極３とに高
電圧を印加する。The cylinder unit 4 is operated to strongly press the rod-shaped material 1 against the molding surface 3a while applying a high voltage to the annular electrode 2 and the anvil electrode 3.
第２図は成形過程を示す説明図であり、棒状素材１は、
自己の抵抗と流れる電流とによるジュール熱により、赤
熱して、軟化する。FIG. 2 is an explanatory view showing the forming process, and the rod-shaped material 1 is
The Joule heat generated by its own resistance and flowing current causes it to glow red and soften.
棒状素材１はシリンダユニット４でアンビル電極３に押
圧されているので、図示するように先端が拡径して、傘
形状となる。Since the rod-shaped material 1 is pressed against the anvil electrode 3 by the cylinder unit 4, the tip has an enlarged diameter as shown in the drawing to have an umbrella shape.
塑性加工済素材を電気アプセッター装置から外して仕上
工程に送るとともに、新たな棒状素材１を電気アプセッ
ター装置に取付け、塑性加工を再開する。The plastically processed material is removed from the electric upsetter device and sent to the finishing process, and a new rod-shaped material 1 is attached to the electric upsetter device to restart the plastic working.
この様な塑性加工を繰返すと、成形面3aが粗れてくるの
で、その程度が管理基準を越えたらアンビル電極３は交
換する。When such plastic working is repeated, the molding surface 3a becomes rough. Therefore, when the degree exceeds the control standard, the anvil electrode 3 is replaced.
表２は本発明のアンビル電極と従来のアンビル電極との
寿命比較表である。Table 2 is a life comparison table of the anvil electrode of the present invention and the conventional anvil electrode.
なお、アンビル電極の寿命（成形回数）は、アンビル電
極３の成形面3aが使用回数にともなって摩耗して窪んで
くるが、この窪みの深さが約1mmに達したときを寿命と
し、それまでの成形個数（成形回数）を調べたものであ
る。 The life (number of times of molding) of the anvil electrode is such that the molding surface 3a of the anvil electrode 3 becomes worn and dents as the number of times it is used. The life is defined when the depth of the dent reaches about 1 mm. The number of moldings (the number of moldings) up to is investigated.
また、19−9DLは鉄基Ni−Cr−Mo耐熱合金の１種であ
り、その成分は、Cr＝18.5％、Ｗ＝1.35％、Ni＝９％、
Ｃ＝0.32％、Mo＝1.40％、Nb＝0.4％、Ti＝0.25％、Fe
＝残部である。Further, 19-9DL is a kind of iron-based Ni-Cr-Mo heat resistant alloy, and its components are Cr = 18.5%, W = 1.35%, Ni = 9%,
C = 0.32%, Mo = 1.40%, Nb = 0.4%, Ti = 0.25%, Fe
= The rest.
表２によれば、実施例は3500個成形可能であり、これは
比較例１（ステンレス鋼）や比較例２（鉄基耐熱鋼）の
成形個数400個,600個に比較して５倍以上に当る。According to Table 2, 3500 pieces can be formed in the embodiment, which is more than 5 times as large as the number of formed pieces of 400 pieces and 600 pieces in Comparative example 1 (stainless steel) and Comparative example 2 (iron-based heat-resistant steel). Hit
また、同じInconel713C製アンビル電極であっても、鋳
造後に水冷焼入れを施した実施例と、鋳造後に空冷処置
をした比較例３とでは、成形個数の点で3500:2000の差
があり、「鋳造後の水冷焼入れ」が有効であることが示
されている。Even with the same Inconel 713C anvil electrode, there is a difference of 3500: 2000 in terms of the number of moldings between the example in which water cooling and quenching were performed after casting and the comparative example 3 in which air cooling treatment was performed after casting. The latter "water cooling quench" has been shown to be effective.
次に、従来技術で述べた、棒状素材に発生するシワとア
ンビル電極の材質との関係を説明する。即ち、アンビル
電極の熱伝導性が良過ぎると、棒状素材の先端に温度ひ
けが発生するというものであった。Next, the relationship between the wrinkles generated in the rod-shaped material and the material of the anvil electrode described in the prior art will be described. That is, if the thermal conductivity of the anvil electrode is too good, a temperature sink occurs at the tip of the rod-shaped material.
表３は棒状素材のシワ発生による不良率比較表である。Table 3 is a comparison table of defective rates due to wrinkling of the rod-shaped material.
棒状素材シワとは、アプセッターの際に、傘の部分にＶ
字状のシワが発生することをいう。このシワは浅ければ
次の仕上工程で除くことができるが、谷の角度が120゜
以下の深いものについては修正不可である。 The wrinkle on the rod material means that when the upsetter is pressed, the V
It means that character-shaped wrinkles occur. This wrinkle can be removed in the next finishing process if it is shallow, but it cannot be corrected for deep valleys with a valley angle of 120 ° or less.
棒状素材シワ発生による不良率は、（アンビル電極の寿
命に至るまでに発生た不良数合計）÷（アンビル電極の
寿命に至るまでに製造した個数合計）×100で計算され
る。The defective rate due to the wrinkle of the rod-shaped material is calculated by (total number of defectives generated until the life of the anvil electrode) ÷ (total number of manufactured products before the life of the anvil electrode) × 100.
上記不良品の出現は、比較例１〜３及び実施例ともにそ
れほど多くないが、アンビル電極の摩耗による窪みの発
生等の要素もからんで、比較例１より比較例２、比較例
２より比較例３、更に比較例３より実施例の方が不良率
は小さく、好ましい結果が得られた。The appearance of the above defective products is not so large in Comparative Examples 1 to 3 and Examples, but due to factors such as occurrence of dents due to wear of the anvil electrode, Comparative Example 1 is compared with Comparative Example 2 and Comparative Example 2 is compared. 3, the defective rate was smaller in the example than in the comparative example 3, and favorable results were obtained.
（発明の効果） 以上に述べた通り、本発明は、エンジンバルブ用棒状素
材の先端をアンビル電極に当接し、棒状素材とアンビル
電極とに高電圧を印加し、棒状素材を通電加熱しつつア
ンビル電極に押圧することで据込み成形するようにした
電気アプセッター用において、アンビル電極を、Ni基耐
熱超合金の一種であるInconel 713Cからなることを特徴
としたものであり、クリープラプチャー強さが十分に大
きいのでアンビル電極の寿命が延び、且つ棒状素材の成
形不良率も小さくでき、好ましい電気アプセッターが維
持できる。(Effects of the Invention) As described above, according to the present invention, the tip of a rod-shaped material for an engine valve is brought into contact with an anvil electrode, a high voltage is applied to the rod-shaped material and the anvil electrode, and the rod-shaped material is electrically heated while being heated. In an electric upsetter for upsetting by pressing against the electrode, the anvil electrode is characterized by being made of Inconel 713C, which is a kind of Ni-based heat-resistant superalloy, and has sufficient creep rupture strength. Since it is extremely large, the life of the anvil electrode can be extended, the defective rate of the rod-shaped material can be reduced, and a preferable electric upsetter can be maintained.
第１図は本発明に係るアンビル電極を適用した電気アプ
セッター装置の概略図、第２図は成形過程を示す電気ア
プセッターの要部を示す図、第３図は1000時間クリープ
ラプチャー強さを示すグラフ、第４図は従来の欠点を説
明したアプセッターの概略図である。 尚、図面中、１は棒状素材、２は環状電極、３はアンビ
ル電極、５は加圧パンチである。FIG. 1 is a schematic view of an electric upsetter device to which the anvil electrode according to the present invention is applied, FIG. 2 is a view showing a main part of the electric upsetter showing a molding process, and FIG. 3 is a graph showing 1000-hour creep rupture strength. , FIG. 4 is a schematic view of an upsetter for explaining the conventional drawbacks. In the drawings, 1 is a rod-shaped material, 2 is an annular electrode, 3 is an anvil electrode, and 5 is a pressure punch.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 曽我 龍司 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (72)発明者 浅井 良道 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (56)参考文献 特公 昭43−29257（ＪＰ，Ｂ１) 特公 昭46−13821（ＪＰ，Ｂ１) 特公 昭48−43026（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Ryuji Soga 1-10-1 Shin-Sayama, Sayama-shi, Saitama Prefecture Within Honda Engineering Co., Ltd. (72) Yoshimichi Asai 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Within Da Engineering Co., Ltd. (56) Reference Japanese Patent Publication No. 43-29257 (JP, B1) Japanese Publication No. 46-13821 (JP, B1) Japanese Publication No. 48-43026 (JP, B2)
Claims (1)
バルブ用棒状素材の先端をアンビル電極に当接し、前記
棒状素材とアンビル電極とに高電圧を印加し、棒状素材
を通電加熱しつつアンビル電極に押圧することで据込み
成形するようにした電気アプセッターにおいて、前記ア
ンビル電極は、Ni基耐熱超合金の一種であるInconel 71
3Cからなり、且つ鋳造後に直ちに水冷焼入れすることで
製造されたものであることを特徴とした電気アプセッタ
ー用アンビル電極。Claim: What is claimed is: 1. A tip of a rod-shaped material for engine valves, which has a lower heat resistance strength than that of the anvil electrode, is brought into contact with the anvil electrode, and a high voltage is applied to the rod-shaped material and the anvil electrode to heat the rod-shaped material to the anvil electrode while electrically heating. In the electric upsetter configured to be upset by pressing, the anvil electrode is an Inconel 71 which is a kind of Ni-based heat-resistant superalloy.
An anvil electrode for an electric upsetter, which is made of 3C and manufactured by water quenching immediately after casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62214389A JPH0688088B2 (en) | 1987-08-28 | 1987-08-28 | Anvil electrode for electric upsetter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62214389A JPH0688088B2 (en) | 1987-08-28 | 1987-08-28 | Anvil electrode for electric upsetter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6457940A JPS6457940A (en) | 1989-03-06 |
| JPH0688088B2 true JPH0688088B2 (en) | 1994-11-09 |
Family
ID=16654979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62214389A Expired - Fee Related JPH0688088B2 (en) | 1987-08-28 | 1987-08-28 | Anvil electrode for electric upsetter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0688088B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0771717B2 (en) * | 1990-03-26 | 1995-08-02 | 本田技研工業株式会社 | Engine valve manufacturing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5438135B2 (en) * | 1971-09-30 | 1979-11-19 |
-
1987
- 1987-08-28 JP JP62214389A patent/JPH0688088B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6457940A (en) | 1989-03-06 |
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