JPH02121743A - Forging method - Google Patents
Forging methodInfo
- Publication number
- JPH02121743A JPH02121743A JP63277010A JP27701088A JPH02121743A JP H02121743 A JPH02121743 A JP H02121743A JP 63277010 A JP63277010 A JP 63277010A JP 27701088 A JP27701088 A JP 27701088A JP H02121743 A JPH02121743 A JP H02121743A
- Authority
- JP
- Japan
- Prior art keywords
- burr
- mold
- forming
- die
- main body
- 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
- 238000000034 method Methods 0.000 title claims description 24
- 238000005242 forging Methods 0.000 title claims description 9
- 239000000047 product Substances 0.000 description 25
- 238000000465 moulding Methods 0.000 description 8
- 238000009966 trimming Methods 0.000 description 4
- 230000037303 wrinkles Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- ZBMRKNMTMPPMMK-UHFFFAOYSA-N 2-amino-4-[hydroxy(methyl)phosphoryl]butanoic acid;azane Chemical compound [NH4+].CP(O)(=O)CCC(N)C([O-])=O ZBMRKNMTMPPMMK-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/08—Making machine elements axles or shafts crankshafts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えば、クランクシャフトなどを成形するの
に用いられる鍛造成形方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a forging method used for forming, for example, a crankshaft.
クランクシャフト等の鍛造品の製造工程は、例えば、丸
棒状の鋼材を所定の長さに切断するビレット工程、断面
形状を整えるロールおよびノ＼スター工程、予備（荒）
加工であるプロツカ−工程、仕上げ加工であるフィッシ
ャー工程、およびハリを取り除くトリミング工程などか
らなる（特開昭５９−２２５８４２号公報参照）。ハス
ター工程、プロツカ−工程、フィッシャー工程、および
トリミング工程はプレスによって行われ、上記のプロツ
カ−工程で使用されるプレスには予備成形型が、フィッ
シャー工程で使用されるプレスには仕上型が各々取り付
けられる。そして、上記予備成形型にて成形された予備
成形品は、上記の仕上型に移し替えられ、この仕上型内
でプレスされることによって仕上げ成形されることにな
る。The manufacturing process for forged products such as crankshafts includes, for example, a billet process in which a round bar-shaped steel material is cut into a predetermined length, a roll and star process to prepare the cross-sectional shape, and a preliminary (rough) process.
It consists of a Protzker process, which is processing, a Fischer process, which is finishing, and a trimming process, which removes firmness (see Japanese Patent Laid-Open No. 59-225842). The Haster process, Protzker process, Fischer process, and trimming process are performed by presses, and the press used in the Protzker process is equipped with a preforming die, and the press used in the Fischer process is equipped with a finishing die. It will be done. The preformed product formed in the preform mold is then transferred to the finishing mold, and is pressed in the finishing mold to be finished molded.
予備成形型は、第８図（ａ）に示すように、上型１１と
下型１２とからなり、上型１１には本体形成部１１ａ、
バリ形成部１１ｂ、および、本体形成部１１ａとバリ形
成部１１ｂとの間に位置するエツジ部１１ｃが形成され
、同様に、下型１２には本体形成部１２ａ、バリ形成部
１２ｂ、および、本体形成部１２ａとバリ形成部１２ｂ
との間に位置するエツジ部１２ｃが形成されている。そ
して、上記の予備成形型１０からは、同図（ｂ）に示す
ように、予備成形品１３が得られるが、この予備成形品
１３におけるバリ部１３ｂは、本体部１３ａの側面側に
おいて前記のエツジ部１１ｃ・１２ｃの曲率半径に倣っ
た形状を有する繋ぎ部１３ｃを有して薄い板状に形成さ
れる。As shown in FIG. 8(a), the preforming mold consists of an upper mold 11 and a lower mold 12, and the upper mold 11 has a main body forming part 11a,
A burr forming part 11b and an edge part 11c located between the main body forming part 11a and the burr forming part 11b are formed, and similarly, the lower mold 12 has a main body forming part 12a, a burr forming part 12b, and a main body Forming part 12a and burr forming part 12b
An edge portion 12c is formed between the two edges. A preform 13 is obtained from the above preform 10, as shown in FIG. It is formed into a thin plate shape with a connecting portion 13c having a shape that follows the radius of curvature of the edge portions 11c and 12c.
ところが、上記のように、プレスの強大な力で鋼材を押
し潰し、また、余肉をバリ形成部１２ｂに逃がすため、
上記の予備成形型１０における予備成形品１３の累積成
形個数が増加していくと、前記のエツジ部１１ｃ・１２
ｃが摩耗してその曲率半径が次第に大きくなる。エツジ
部１１ｃ・１２Ｃの曲率半径が大きくなると、それに倣
って前記の繋ぎ部１３ｃの曲率半径が大きくなる。この
ため、第９図（ａ）（ｂ）に示すように、上記の予備成
形品１３を仕上型１４上に移し替える際に、予備成形品
１３の繋ぎ部１３ｃが仕上型１４における下型１５のエ
ツジ部１５ｃに当たりその本体形成部１５ａ内に本体部
１３ａが正確に収まることができず、予備成形品１３は
下型１５上で傾いたり浮き上がったりした状態でセット
されることになる。かかる状態で仕上げ成形が行われる
と、仕上げ成形品には図中Ａ矢示部およびＢ矢示部等に
おいて“皺きず” “かじり°“まくれ゛などが生じ、
不良製品が頻繁に生じてしまうという問題を招来してい
た。However, as mentioned above, since the steel material is crushed by the strong force of the press and the excess material is released into the burr forming part 12b,
As the cumulative number of preforms 13 molded in the preform mold 10 increases, the edge portions 11c and 12
c wears out and its radius of curvature gradually increases. As the radius of curvature of the edge portions 11c and 12C increases, the radius of curvature of the connecting portion 13c increases accordingly. Therefore, as shown in FIGS. 9(a) and 9(b), when the above-mentioned preformed product 13 is transferred onto the finishing mold 14, the connecting portion 13c of the preformed product 13 is connected to the lower mold 15 of the finishing mold 14. The main body part 13a cannot be accurately accommodated in the main body forming part 15a by the edge part 15c, and the preform 13 is set on the lower mold 15 in an inclined or floating state. When finishing molding is carried out under such conditions, "wrinkles", "galling", "curling", etc. will occur in the finished molded product at the areas indicated by arrows A and B in the figure, etc.
This has led to the problem of frequent production of defective products.
本発明に係る鍛造成形方法は、上記の課題を解決するた
めに、予備成形型にて予備成形した後に仕上型にて仕上
成形して鍛造成形品を得るようにした鍛造成形方法にお
いて、前記予備成形の際には、予備成形品の本体部の周
囲に形成されるバリを、仕上げ成形の段階における正規
のバリ位置よりも上方に形成することを特徴としている
。In order to solve the above-mentioned problems, a forging forming method according to the present invention provides a forging forming method in which a forged product is obtained by preforming in a preforming die and then finishing forming in a finishing die. During molding, the burr formed around the main body of the preform is formed above the normal burr position in the final molding stage.
上記の構成によれば、予備成形型の下型のエツジ部が摩
耗してその曲率半径が次第に大きくなり、それに倣って
予備成形品におけるバリの繋ぎ部の曲率半径が太き（な
っても、このバリは正規の位置よりも上方に形成される
ので、かかる予備成形品を仕上型の下型上に移し替えた
際には、予備成形品の繋ぎ部は仕上型における下型のエ
ツジ部には当たらず、その本体形成部内に予備成形品の
本体部が正確に収まることができる。そして、かかる状
態で仕上げ成形が行われれば、仕上成形品において“皺
きず゛パかじり”“まくれ”などは生ぜず、さらに、こ
の仕上成形の段階でバリは正規の位置に押し下げられ、
その後のトリミングなどを不都合なく行うことができる
。According to the above configuration, as the edge portion of the lower die of the preform is worn out, its radius of curvature gradually increases, and accordingly, the radius of curvature of the connecting portion of the burr on the preform increases (even if it becomes thicker). This burr is formed above the normal position, so when the preform is transferred onto the lower mold of the finishing mold, the connecting part of the preform is on the edge of the lower mold of the finishing mold. The main body of the preformed product can be accurately accommodated within the main body forming part.If the final molding is performed in such a state, there will be no wrinkles, cracks, curls, etc. in the finished molded product. In addition, the burrs are pushed down to their proper positions during this final forming stage.
Subsequent trimming etc. can be performed without any inconvenience.
本発明の一実施例を第１図ないし第７回に基づいて説明
すれば、以下の通りである。An embodiment of the present invention will be described below based on FIGS. 1 to 7.
本発明に係る鍛造成形方法において、第１図（ａ）（ｂ
）に示すように、予備成形に使用される予備成形型１は
上型２と下型３とからなり、上型２には本体形成部２ａ
、バリ形成部２ｂ、および、本体形成部２ａとバリ形成
部２ｂとの間に位置するエツジ部２Ｃが形成され、同様
に、下型３には本体形成部３ａ、バリ形成部３ｂ、およ
び、本体形成部３ａとバリ形成部３ｂとの間に位置する
エツジ部３Ｃが形成されている。そして、上型２の本体
形成部２ａの深さは正規の深さより浅く設定される一方
、下型３の本体形成部３ａの深さは正規の深さより深く
設定されている。即ち、バリ形成部２ｂ・３ｂ間に形成
されるバリ形成空隙の中心は、図中仮想線Ｃにて示すよ
うに、正規の位置である仮想線Ｄ（正規の位置は一般に
鍛造成形品の断面中央部である）よりも上方に形成され
、その差は成形品によって異なるが、例えば成形品がク
ランクシャフトである場合、約１０ｍｍに設定される。In the forging method according to the present invention, FIGS.
), the preforming mold 1 used for preforming consists of an upper mold 2 and a lower mold 3, and the upper mold 2 has a main body forming part 2a.
, a burr forming part 2b, and an edge part 2C located between the main body forming part 2a and the burr forming part 2b.Similarly, the lower mold 3 has a main body forming part 3a, a burr forming part 3b, and An edge portion 3C is formed between the main body forming portion 3a and the burr forming portion 3b. The depth of the main body forming portion 2a of the upper mold 2 is set to be shallower than the normal depth, while the depth of the main body forming portion 3a of the lower mold 3 is set to be deeper than the normal depth. That is, the center of the burr-forming gap formed between the burr-forming parts 2b and 3b is located at the imaginary line D, which is the normal position, as shown by the imaginary line C in the figure. Although the difference differs depending on the molded product, for example, if the molded product is a crankshaft, it is set to about 10 mm.
一方、第２図（ａ）（ｂ）に示すように、仕上げ成形に
使用される仕上型４は上型５と下型６とからなり、上型
５には本体形成部５ａ、バリ形成部５ｂ、および、本体
形成部５ａとバリ形成部５ｂとの間に位置するエツジ部
５Ｃが形成され、同様に、下型６には本体形成部６ａ、
バリ形成部６ｂ、および、本体形成部６ａとバリ形成部
６ｂとの間に位置するエツジ部６Ｃが形成されている。On the other hand, as shown in FIGS. 2(a) and 2(b), the finishing mold 4 used for finishing molding consists of an upper mold 5 and a lower mold 6, and the upper mold 5 has a main body forming part 5a and a burr forming part. 5b, and an edge portion 5C located between the main body forming portion 5a and the burr forming portion 5b.Similarly, the lower mold 6 has a main body forming portion 6a,
A burr forming portion 6b and an edge portion 6C located between the main body forming portion 6a and the burr forming portion 6b are formed.
かかる仕上型４において、バリ形成部５ｂ・６ｂ間に形
成されるバリ形成空隙の中心は、正規の位置である仮想
線り上に設定されている。In this finishing mold 4, the center of the burr forming gap formed between the burr forming parts 5b and 6b is set on a virtual line that is a normal position.
なお、一般の予備成形型において適用される原則に従い
、予備成形型１の本体形成部２ａ・３ａの幅は仕上型４
の本体形成部５ａ・６ａの幅よりも幾分狭く設定される
一方、その分について仕上成形品に肉不足が生じないよ
うに本体形成部深さが調整され結果的に両者の断面積は
等しく設定されている。In addition, according to the principle applied to general preforming molds, the width of the main body forming parts 2a and 3a of the preforming mold 1 is the same as that of the finishing mold 4.
Although the width of the main body forming portions 5a and 6a is set to be somewhat narrower than that of the main body forming portions 5a and 6a, the depth of the main body forming portion is adjusted so that the finished molded product does not have insufficient thickness, and as a result, the cross-sectional area of both is equal. It is set.
前記の予備成形型１の上型２上には、第３図に示すよう
に、バスタ−工程で断面形状が整えられたワーク７がセ
ットされ、この状態でプレスされることにより、第４図
（ａ）および（ｂ）に示すように、予備成形品８が成形
される。この予備成形品８におけるバリ部８ｂは、本体
部８ａの側面側において前記のエツジ部２Ｃ・３Ｃの曲
率半径に倣った形状を有する繋ぎ部８Ｃを有して薄い板
状に形成されると共に、バリ部８ｂの中心を正規の位置
よりも上方に位置して形成される。この場合でも勿論、
予備成形型１における予備成形品８の累積成形個数が増
加していくと、前記のエツジ部２ｃ・３ｃが摩耗してそ
の曲率半径が次第に大きくなり、それに倣って前記の繋
ぎ部８ｃの曲率半径が大きくなることになる。As shown in FIG. 3, a workpiece 7 whose cross-sectional shape has been adjusted in the buster process is set on the upper mold 2 of the preforming mold 1, and by being pressed in this state, the workpiece 7 shown in FIG. As shown in (a) and (b), a preform 8 is molded. The burr portion 8b in this preformed product 8 is formed into a thin plate shape with a connecting portion 8C having a shape that follows the radius of curvature of the edge portions 2C and 3C on the side surface side of the main body portion 8a, and The center of the burr portion 8b is located above the normal position. In this case, of course,
As the cumulative number of preformed products 8 formed in the preform 1 increases, the edge portions 2c and 3c are worn out and the radius of curvature thereof gradually increases, and the radius of curvature of the connection portion 8c increases accordingly. will become larger.
予備成形品８は、次に仕上型４の下型６上に移し替えら
れてセットされるのであるが、第５図（ａ）（ｂ）に示
すように、たとえ、繋ぎ部８ｃの曲率半径が太き（なっ
ても、バリ部８ｂは正規の位置よりも上方に形成される
ので、予備成形品８の繋ぎ部８Ｃは仕上型４における下
型６のエツジ部６ｃには当たらず、その本体形成部６ａ
内に予備成形品８の本体部８ａが正確に収まることがで
きる。そして、この状態で仕上げ成形が行われることに
より、第６図（ａ）および（ｂ）に示すように、仕上成
形品９が得られる。このようにして得られた仕上成形品
９には、“皺きずパ°“かじり”“まくれ”などは生ぜ
ず、さらに、この仕上成形の段階においてバリ部９ｂは
正規の位置に押し下げられ、第７図（ａ）（ｂ）に示す
ように、その後のトリミングにおいてこれを不都合なく
行って最終的製品であるクランクシャフト（本体部９ａ
）を得ることができる。加えて、上述のように、予備成
形品８の繋ぎ部８Ｃは仕上型４における下型６のエツジ
部６Ｃには当たらず、本体形成部６ａ内に予備成形品８
の本体部８ａが正確に収まることができるのであるから
、仕上型４における下型６のエツジ部６Ｃの摩耗も抑止
され、仕上型４の寿命を延ばすことができる。The preformed product 8 is then transferred and set on the lower mold 6 of the finishing mold 4, but as shown in FIGS. Even if the burr part 8b is formed above the normal position, the joint part 8C of the preform 8 does not hit the edge part 6c of the lower mold 6 in the finishing mold 4, and the burr part 8b is formed above the normal position. Main body forming part 6a
The main body portion 8a of the preform 8 can be accurately accommodated therein. Then, by performing finishing molding in this state, a finished molded product 9 is obtained as shown in FIGS. 6(a) and 6(b). The finished molded product 9 obtained in this manner does not have any wrinkles, scratches, galling, or curling, and furthermore, the burr portion 9b is pushed down to the proper position during this final molding stage, and the As shown in FIGS. 7(a) and 7(b), this process was carried out without any inconvenience in the subsequent trimming process, and the final product, the crankshaft (main body part 9a)
) can be obtained. In addition, as described above, the connecting portion 8C of the preform 8 does not touch the edge portion 6C of the lower mold 6 in the finishing mold 4, and the preform 8 is inside the main body forming portion 6a.
Since the main body portion 8a of the finishing die 4 can be accurately accommodated, wear of the edge portion 6C of the lower die 6 in the finishing die 4 is also suppressed, and the life of the finishing die 4 can be extended.
本発明に係る鍛造成形方法は、以上のように、予備成形
型にて予備成形した後に仕上型にて仕上成形して鍛造成
形品を得るようにした鍛造成形方法において、前記予備
成形の際には、予備成形品の本体部の周囲に形成される
バリを、仕上げ成形の段階における正規のバリ位置より
も上方に形成する構成である。As described above, the forging forming method according to the present invention is a forging forming method in which a forged product is obtained by preforming in a preforming die and then finishing forming in a finishing die, in which a forged product is obtained during the preforming. This is a configuration in which the burr formed around the main body of the preform is formed above the normal burr position in the final molding stage.
これにより、予備成形品におけるバリの繋ぎ部の曲率半
径が大きくなっても、予備成形品の繋ぎ部は仕上型にお
ける下型のエツジ部には当たらず、その本体形成部内に
予備成形品の本体部が正確に収まることができる。よっ
て、仕上成形品において皺きず““かじり゛“まくれ゛
などが生じるのを防止できると共に、仕上型における下
型のエツジ部の摩耗を抑止して、仕上型の長寿命化が図
れるという効果も併せて奏する。As a result, even if the radius of curvature of the joint part of the burr on the preform becomes large, the joint part of the preform does not hit the edge of the lower mold in the finishing mold, and the main body of the preform is inside the main body forming part. can fit accurately. Therefore, it is possible to prevent wrinkles, scratches, bulges, etc. from occurring in the finished molded product, and it also has the effect of suppressing wear on the edge of the lower mold in the finishing mold, thereby extending the life of the finishing mold. Play along.
第１図ないし第７図は本発明の一実施例を示すものであ
って、第１図（ａ）は予備成形型の縦断面正面図、同図
（ｂ）は予備成形型の縦断面側面図、第２図（ａ）は仕
上型の縦断面正面図、同図（ｂ）は仕上型の縦断面側面
図、第３図はワークの平面図、第４図（ａ）は予備成形
品の平面図、同図（ｂ）は同図（ａ）におけるｘ−Ｘ矢
視の簡略断面図、第５図（ａ）は仕上型に予備成形品を
セフ）した状態の縦断面正面図、同図（ｂ）は仕上型に
予備成形品をセットした状態の縦断面側面図、第６図（
ａ）は仕上成形品の平面図、同図（ｂ）は同図（ａ）に
おけるＹ−Ｙ矢視の簡略断面図、第７図（ａ）はクラン
クシャフト（仕上成形品の本体部）の平面図、同図（ｂ
）はバリ部の平面図、第８図および第９図は従来例を示
すものであって、第８図（ａ）は予備成形型の縦断面正
面図、同図（ｂ）は予備成形品の縦断面正面図、第９図
（ａ）は仕上型に予備成形品をセットした状態の縦断面
正面図、同図（ｂ）は仕上型に予備成形品をセットした
状態の縦断面側面図である。
■は予備成形型、２は上型、３は下型、４は仕上型、５
は上型、６は下型、８は予備成形品、９は仕上成形品で
ある。
第
図（ａ）
第
図（ａ）
図（ｂ）
図（ｂ）
図（ｂ）
第
図（ａ）
第
図（ａ）
第
図（ｂ）
第
８図（ｂ）
第
図（ｂ）
３ａ
５ａ1 to 7 show an embodiment of the present invention, in which FIG. 1(a) is a vertical cross-sectional front view of the preforming mold, and FIG. 1(b) is a vertical cross-sectional side view of the preforming mold. Figure 2(a) is a vertical cross-sectional front view of the finishing mold, Figure 2(b) is a vertical cross-sectional side view of the finishing mold, Figure 3 is a plan view of the workpiece, and Figure 4(a) is the preformed product. FIG. 5(b) is a simplified sectional view taken along the line XX in FIG. 5(a), and FIG. Figure 6 (b) is a vertical cross-sectional side view of the preformed product set in the finishing mold, and Figure 6 (
7(a) is a plan view of the finished molded product, FIG. 7(b) is a simplified sectional view taken along YY arrow in FIG. 7(a), and FIG. Plan view, same figure (b
) is a plan view of the burr part, FIGS. 8 and 9 show the conventional example, FIG. 8(a) is a vertical cross-sectional front view of the preform, and FIG. FIG. 9(a) is a vertical cross-sectional front view of the preform set in the finishing mold, and FIG. 9(b) is a vertical cross-sectional side view of the preform set in the finishing mold. It is. ■ is a preforming mold, 2 is an upper mold, 3 is a lower mold, 4 is a finishing mold, 5
6 is an upper mold, 6 is a lower mold, 8 is a preformed product, and 9 is a finished molded product. Figure (a) Figure (a) Figure (b) Figure (b) Figure (b) Figure (a) Figure (a) Figure (b) Figure 8 (b) Figure (b) 3a 5a
Claims (1)
形して鍛造成形品を得るようにした鍛造成形方法におい
て、 前記予備成形の際には、予備成形品の本体部の周囲に形
成されるバリを、仕上げ成形の段階における正規のバリ
位置よりも上方に形成することを特徴とする鍛造成形方
法。[Claims] 1. A forging method in which a forged product is obtained by preforming in a preforming die and then final forming in a finishing die, wherein during the preforming, the preformed product is A forging method characterized in that the burr formed around the main body is formed above the regular burr position in the final forming stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63277010A JP2619502B2 (en) | 1988-10-31 | 1988-10-31 | Forging method and preforming die used in this method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63277010A JP2619502B2 (en) | 1988-10-31 | 1988-10-31 | Forging method and preforming die used in this method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02121743A true JPH02121743A (en) | 1990-05-09 |
| JP2619502B2 JP2619502B2 (en) | 1997-06-11 |
Family
ID=17577506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63277010A Expired - Fee Related JP2619502B2 (en) | 1988-10-31 | 1988-10-31 | Forging method and preforming die used in this method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2619502B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010240710A (en) * | 2009-04-08 | 2010-10-28 | Sumitomo Metal Ind Ltd | Stamp forged crank shaft, method for manufacturing the same, and stamp forging die used for manufacture thereof |
-
1988
- 1988-10-31 JP JP63277010A patent/JP2619502B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010240710A (en) * | 2009-04-08 | 2010-10-28 | Sumitomo Metal Ind Ltd | Stamp forged crank shaft, method for manufacturing the same, and stamp forging die used for manufacture thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2619502B2 (en) | 1997-06-11 |
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