JP2506593B2 - Closure forging device - Google Patents
Closure forging deviceInfo
- Publication number
- JP2506593B2 JP2506593B2 JP34525491A JP34525491A JP2506593B2 JP 2506593 B2 JP2506593 B2 JP 2506593B2 JP 34525491 A JP34525491 A JP 34525491A JP 34525491 A JP34525491 A JP 34525491A JP 2506593 B2 JP2506593 B2 JP 2506593B2
- Authority
- JP
- Japan
- Prior art keywords
- punch
- shaft hole
- diameter
- forging
- curved surface
- 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 - Fee Related
Links
Landscapes
- Punching Or Piercing (AREA)
- Forging (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、閉塞鍛造装置に関し、
一層詳細には、軸孔の打抜き加工に先立ち、閉塞鍛造に
よりビレットの両端面に大径な軸孔の成形に有効な凹部
を設ける閉塞鍛造装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed forging device,
More specifically, the present invention relates to a closed forging device in which a recess effective for forming a large-diameter shaft hole is formed on both end surfaces of a billet by closed forging prior to punching the shaft hole.
【０００２】[0002]
【従来の技術】硬質な材質からなるビレットに軸孔を穿
設する方法の一例として、本願出願人により等速ジョイ
ント用スパイダの軸孔を打抜きする方法が提案されてい
る（特願平２−６８７４２号）。図７にこの等速ジョイ
ント用スパイダ１０を示す。等速ジョイント用スパイダ
１０は軸孔１２を有するボス部１４と、このボス部１４
の外周面に突設された複数のローラ軸１６ａ乃至１６ｃ
からなる。2. Description of the Related Art As an example of a method for forming a shaft hole in a billet made of a hard material, the applicant of the present application has proposed a method for punching out the shaft hole of a spider for a constant velocity joint (Japanese Patent Application No. 2- 68742). FIG. 7 shows this constant velocity joint spider 10. The constant velocity joint spider 10 includes a boss portion 14 having a shaft hole 12, and a boss portion 14
A plurality of roller shafts 16a to 16c provided on the outer peripheral surface of the roller
Consists of
【０００３】先ず、ビレット等の素材に閉塞鍛造を施
し、図３に示すように、前記ボス部１４に対応する両端
面に凹部１８ａ、１８ｂを有する中間体２０を形成す
る。次いで、この中間体２０の凹部１８ａ、１８ｂ間を
打抜きポンチを用いて除去することで軸孔１２を穿設す
る。なお、前記閉塞鍛造で中間体２０に凹部１８ａ、１
８ｂを設ける目的は、軸孔１２を打ち抜く際の荷重を軽
減するためである。First, a material such as a billet is subjected to closed forging to form an intermediate body 20 having recesses 18a and 18b on both end surfaces corresponding to the boss portion 14, as shown in FIG. Next, the space between the recesses 18a and 18b of the intermediate body 20 is removed by using a punch punch to form the shaft hole 12. It should be noted that the recesses 18a, 1 are formed in the intermediate body 20 by the closed forging.
The purpose of providing 8b is to reduce the load when punching the shaft hole 12.
【０００４】[0004]
【発明が解決しようとする課題】ところで、前記等速ジ
ョイント用スパイダ等の成形に際して大径の軸孔を穿設
するには、閉塞鍛造時において、軸孔の直径に応じ凹部
の深さと直径も大きく形成することが必要とされる。By the way, in forming a large-diameter shaft hole in forming the spider for a constant velocity joint, etc., the depth and diameter of the recess are also determined according to the diameter of the shaft hole during closed forging. It needs to be large.
【０００５】しかしながら、このような大径で深い凹部
を閉塞鍛造で設けた場合、凹部周縁にクラックの発生す
る不都合が指摘されており、大径な軸孔形成が非常に困
難であった。特に、ローラ軸１６ａ乃至１６ｃに対する
凹部１８ａ、１８ｂの段差ｈが大きくなるとその影響は
顕著なものとなる。However, it has been pointed out that when such a large-diameter deep recess is formed by closed forging, the disadvantage of cracks occurring at the peripheral edge of the recess is very difficult to form a large-diameter shaft hole. In particular, when the step h of the recesses 18a and 18b with respect to the roller shafts 16a to 16c becomes large, the influence becomes remarkable.
【０００６】従って、本発明は、前記の不都合を克服す
べく、成形品の大径な軸孔を穿設するのに有効な深さと
直径からなる凹部をクラックを発生させることなく設け
ることを可能とする閉塞鍛造装置を提供することを目的
とする。Therefore, according to the present invention, in order to overcome the above-mentioned inconvenience, it is possible to provide a recess having a depth and a diameter effective for forming a large-diameter shaft hole without forming a crack. An object of the present invention is to provide a closed forging device.
【０００７】[0007]
【課題を解決するための手段】前記の課題を解決するた
めに、本発明は、軸孔の打抜き加工に先立ち、ダイスに
より保持されたビレットの両端面の前記軸孔に対応する
部位にポンチを圧入し、凹部を形成する閉塞鍛造装置に
おいて、前記ポンチの先端の中央部を大径な半径の曲面
とし、前記先端の周縁部を前記中央部よりも小径な半径
の曲面とすることを特徴とする。In order to solve the above-mentioned problems, according to the present invention, prior to the punching of the shaft hole, a punch is provided at a portion corresponding to the shaft hole on both end faces of a billet held by a die. In a closed forging device that press-fits to form a recess, the center portion of the tip of the punch is a curved surface with a large radius, and the peripheral portion of the tip is a curved surface with a radius smaller than the central portion. To do.
【０００８】[0008]
【作用】本発明に係る閉塞鍛造装置では、軸孔の打抜き
加工に先立ち、ポンチの先端の中央部が大径の半径の曲
面からなり、且つ、前記先端の周縁部が前記中央部より
も小径な半径の曲面からなる鍛造用ポンチを用いてビレ
ットを閉塞鍛造することにより、前記ビレットの両端面
に大径の軸孔を穿設するために有効な深さと直径を有す
る凹部をクラックを発生させることなく形成することが
できる。そして、この凹部に打抜きポンチの中心線を一
致させて打抜きポンチを圧入することにより大径の軸孔
を得ることができる。In the closed forging device according to the present invention, prior to the punching of the shaft hole, the center portion of the tip of the punch is formed of a curved surface having a large radius, and the peripheral portion of the tip has a diameter smaller than that of the center portion. By forging the billet with a punching punch having a curved surface with a large radius, a crack having a depth and a diameter effective for drilling a large-diameter shaft hole is formed in both end faces of the billet. Can be formed without. Then, a large diameter shaft hole can be obtained by press-fitting the punching punch with the center line of the punching punch aligned with the recess.
【０００９】[0009]
【実施例】次に本発明に係る閉塞鍛造装置について好適
な実施例を挙げ、添付の図面を参照しながら以下詳細に
説明する。The preferred embodiments of the closed forging device according to the present invention will now be described in detail with reference to the accompanying drawings.
【００１０】なお、本実施例においては、等速ジョイン
ト用スパイダを成形するための閉塞鍛造装置を用いて説
明する。In this embodiment, a closed forging device for forming a constant velocity joint spider will be described.
【００１１】図１において参照符号３０は、図７に示す
等速ジョイント用スパイダ１０を製造するための閉塞鍛
造装置を示す。該閉塞鍛造装置３０は、基本的には、図
示しない機械式若しくは油圧式のプレス装置に配設され
た上ダイス３２と、下ダイス３４と、後述する中間体の
形状を有する空間部３６と、前記上ダイス３２と前記下
ダイス３４の各々の中央部に穿設された空洞部３２ａ、
３４ａに抜脱自在に挿入される中空円筒状のガイド部材
３８、４０と、このガイド部材３８、４０の中空部に抜
脱自在に挿入される上鍛造ポンチ４２並びに下鍛造ポン
チ４４とからなる。In FIG. 1, reference numeral 30 indicates a closed forging device for manufacturing the spider 10 for a constant velocity joint shown in FIG. The closed forging device 30 basically includes an upper die 32, a lower die 34, and a space portion 36 having an intermediate body shape described later, which is arranged in a mechanical or hydraulic press device (not shown). A cavity 32a formed in the center of each of the upper die 32 and the lower die 34,
The hollow cylindrical guide members 38 and 40 are detachably inserted into the guide member 34a, and the upper forging punch 42 and the lower forging punch 44 are detachably inserted into the hollow portions of the guide members 38 and 40.
【００１２】図２に上鍛造ポンチ４２と下鍛造ポンチ４
４を示す。なお、当該上鍛造ポンチ４２と下鍛造ポンチ
４４は、全く同一の形状からなるために以後の説明にお
いて同一の構成には同じ符号を付与して重複する説明を
省略するものとする。FIG. 2 shows an upper forged punch 42 and a lower forged punch 4.
4 is shown. Since the upper forging punch 42 and the lower forging punch 44 have exactly the same shape, the same components will be denoted by the same reference numerals in the following description, and redundant description will be omitted.
【００１３】該上鍛造ポンチ４２並びに下鍛造ポンチ４
４は、基本的には、円筒部４６と、先端部４８とからな
り、該先端部４８は、円筒部４６の直径Ｄに対して５／
４倍に設定される大径の半径Ｒの曲面からなる中央曲面
部５０と、この中央曲面部５０の周縁部に位置し、前記
直径Ｄに対し１／３倍に設定される小径の半径ｒの曲面
からなる周縁曲面部５２とから構成される。また、円筒
部４６と周縁曲面部５２との間には、前記円筒部４６か
ら周縁曲面部５２に指向して小径となるべく傾斜α（≒
４°）に設定されたテーパ面４６ａが形成されている。The upper forging punch 42 and the lower forging punch 4
4 is basically composed of a cylindrical portion 46 and a tip portion 48, and the tip portion 48 is 5/5 with respect to the diameter D of the cylindrical portion 46.
A central curved surface portion 50 formed of a curved surface having a large radius R set to 4 times, and a small radius r located at the peripheral portion of the central curved surface portion 50 and set to 1/3 times the diameter D. And a peripheral curved surface portion 52 formed of a curved surface. Further, between the cylindrical portion 46 and the peripheral curved surface portion 52, an inclination α (≈) is formed so that the diameter is directed from the cylindrical portion 46 toward the peripheral curved surface portion 52 and has a small diameter.
The taper surface 46a set to 4 ° is formed.
【００１４】本実施例の閉塞鍛造装置３０は、基本的に
は以上のように構成されるものであり、次に当該閉塞鍛
造装置３０を用いた等速ジョイント用スパイダ１０の成
形工程並びにその作用効果について説明する。The closed forging device 30 of this embodiment is basically constructed as described above. Next, the forming process of the spider 10 for a constant velocity joint using the closed forging device 30 and its action. The effect will be described.
【００１５】当該閉塞鍛造装置３０を用いた等速ジョイ
ント用スパイダ１０の成形に際しては、先ず、空間部３
６にビレット３５を挿入する。そして、上ダイス３２並
びに下ダイス３４の中央部に穿設された空洞部３２ａ、
３４ａに挿入したガイド部材３８、４０によりこのビレ
ット３５を上下方向より挟持する。When molding the spider 10 for a constant velocity joint using the closed forging device 30, first, the space 3 is formed.
The billet 35 is inserted into 6. Then, a cavity 32a formed in the center of the upper die 32 and the lower die 34,
The billet 35 is vertically clamped by the guide members 38 and 40 inserted in 34a.
【００１６】次に、該ガイド部材３８、４０の中空部に
上鍛造ポンチ４２並びに下鍛造ポンチ４４を挿入した
後、前記上鍛造ポンチ４２並びに下鍛造ポンチ４４を上
下方向より圧入して閉塞鍛造を行う。この閉塞鍛造によ
り、図３に示すように、前記ビレット３５は、上鍛造ポ
ンチ４２、下鍛造ポンチ４４の先端部４８の形状に対応
した凹部５４ａ、５４ｂと、ローラ軸１６ａ乃至１６ｃ
を介した中間体５６に成形される。Next, after inserting the upper forging punch 42 and the lower forging punch 44 into the hollow portions of the guide members 38, 40, the upper forging punch 42 and the lower forging punch 44 are press-fitted in the vertical direction to perform the closed forging. To do. As a result of this closed forging, as shown in FIG. 3, the billet 35 has the recesses 54a and 54b corresponding to the shapes of the tips 48 of the upper forging punch 42 and the lower forging punch 44, and the roller shafts 16a to 16c.
To form the intermediate body 56.
【００１７】この場合、該閉塞鍛造工程では、前記上鍛
造ポンチ４２並びに下鍛造ポンチ４４の先端部４８の形
状により、中央部が大径なＲからなる曲面で、周縁部が
小径なｒからなる曲面の凹部５４ａ、５４ｂが形成され
るため、内面にクラックが発生することなく軸孔１２を
穿設するために有効な深さと直径を有した中間体５６が
得られる。In this case, in the closed forging step, depending on the shapes of the tip portions 48 of the upper forging punch 42 and the lower forging punch 44, the central portion is a curved surface having a large diameter R and the peripheral portion is a small diameter r. Since the curved concave portions 54a and 54b are formed, the intermediate body 56 having a depth and a diameter effective for forming the shaft hole 12 can be obtained without cracks on the inner surface.
【００１８】次に、前記中間体５６から上鍛造ポンチ４
２並びに下鍛造ポンチ４４を各々抜脱した後、図５に示
すように、前記凹部５４ａ、５４ｂに対して打抜きポン
チ５８を圧入して、前記凹部５４ａ、５４ｂ間の素材を
除去することにより、上鍛造ポンチ４２および下鍛造ポ
ンチ４４の直径Ｄに対して５／６倍の直径の軸孔１２を
穿設した。Next, from the intermediate body 56 to the upper forging punch 4
After the 2 and the lower forging punch 44 are respectively removed, as shown in FIG. 5, the punching punch 58 is press-fitted into the recesses 54a and 54b to remove the material between the recesses 54a and 54b. A shaft hole 12 having a diameter of 5/6 times the diameter D of the upper forged punch 42 and the lower forged punch 44 was formed.
【００１９】ここで、凹部５４ａ、５４ｂは、軸孔１２
を穿設するために有効な深さと直径とを有し、且つ、充
分に薄く形成されている。また、図５に示すように、打
抜きポンチ５８のコーナ部５８ａが凹部５４ａ、５４ｂ
の内面に当接し、Ａ位置からＢ位置に移動するまでの間
に、前記コーナ部５８ａに当接する素材は、打抜きポン
チ５８と凹部５４ａ、５４ｂの大径な中央部との間の空
間部位に流動するので、打抜き時の初期抵抗は小さくな
る。従って、前記打抜きの過程では、打抜き加工に要す
る荷重を軽減することができるので、素材へのクラック
発生が回避され、好適な状態の軸孔１２を得ることがで
きる。Here, the recesses 54a and 54b are formed in the shaft hole 12
Has a depth and diameter effective for drilling, and is formed sufficiently thin. Further, as shown in FIG. 5, the corner portion 58a of the punching punch 58 has the concave portions 54a and 54b.
The material that comes into contact with the inner surface of the punch and moves from the A position to the B position comes into contact with the corner portion 58a in the space between the punch punch 58 and the large-diameter central portions of the recesses 54a and 54b. Since it flows, the initial resistance during punching becomes small. Therefore, in the process of punching, the load required for punching can be reduced, so that the occurrence of cracks in the material can be avoided and the shaft hole 12 in a suitable state can be obtained.
【００２０】[0020]
【発明の効果】本発明に係る軸孔の成形方法によれば、
ポンチ先端の中央部が大径な半径の曲面からなり、且
つ、前記ポンチ先端の周縁部が前記中央部よりも小径な
半径の曲面からなる鍛造ポンチを用いた閉塞鍛造によ
り、大径の軸孔を穿設するために有効な深さと直径を有
する凹部をクラックを発生することなく設けることがで
きる。そして、この凹部を打ち抜くことにより、成形品
に変形を生じることなく大径の軸孔を形成することがで
きる。According to the shaft hole forming method of the present invention,
A large diameter shaft hole is formed by closed forging using a forged punch in which the center of the punch tip is a curved surface with a large radius and the peripheral edge of the punch tip is a curved surface with a radius smaller than the central portion. It is possible to form a recess having a depth and a diameter effective for drilling without cracking. Then, by punching out this recess, a large-diameter shaft hole can be formed without causing deformation in the molded product.
【図１】本発明に係る閉塞鍛造装置の一部縦断面図であ
る。FIG. 1 is a partial vertical cross-sectional view of a closed forging device according to the present invention.
【図２】本発明に係る閉塞鍛造装置の鍛造ポンチの先端
部の形状を示す説明図である。FIG. 2 is an explanatory view showing the shape of the tip of a forging punch of the closed forging device according to the present invention.
【図３】図１に示す閉塞鍛造装置による鍛造工程を示す
一部縦断面図である。FIG. 3 is a partial vertical cross-sectional view showing a forging process by the closed forging device shown in FIG.
【図４】本発明に係る閉塞鍛造装置を用いて成形される
等速ジョイント用スパイダの中間体の縦断面図である。FIG. 4 is a vertical cross-sectional view of an intermediate body of a constant velocity joint spider formed by using the closed forging device according to the present invention.
【図５】打抜き工程を示す一部縦断面図である。FIG. 5 is a partial vertical cross-sectional view showing a punching process.
【図６】図４に示す中間体を打ち抜いて得られる等速ジ
ョイント用スパイダの縦断面図である。6 is a vertical sectional view of a spider for a constant velocity joint obtained by punching out the intermediate body shown in FIG.
【図７】本発明に係る閉塞鍛造装置で成形された等速ジ
ョイント用スパイダの平面図である。FIG. 7 is a plan view of a constant velocity joint spider formed by the closed forging device according to the present invention.
【図８】従来技術において得られた等速ジョイント用ス
パイダの中間体の縦断面図である。FIG. 8 is a vertical cross-sectional view of an intermediate body of a spider for a constant velocity joint obtained in a conventional technique.
１０…等速ジョイント用スパイダ １２…軸孔 １４…ボス部 １６ａ〜１６ｃ…ローラ軸 ３０…閉塞鍛造装置 ３２…上ダイス ３４…下ダイス ３５…ビレット ３６…空間部 ３８、４０…ガイド部材 ４２…上鍛造ポンチ ４４…下鍛造ポンチ ４８…先端部 ５０…中央曲面部 ５２…周縁曲面部 ５６…中間体 ５８…打抜きポンチ 10 ... Spider for constant velocity joint 12 ... Shaft hole 14 ... Boss portions 16a to 16c ... Roller shaft 30 ... Closure forging device 32 ... Upper die 34 ... Lower die 35 ... Billet 36 ... Space portion 38, 40 ... Guide member 42 ... Upper Forged punch 44 ... Lower forged punch 48 ... Tip portion 50 ... Central curved surface portion 52 ... Peripheral curved surface portion 56 ... Intermediate body 58 ... Punch punch
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−104437（ＪＰ，Ａ) 特開 昭50−157251（ＪＰ，Ａ) 特開 昭59−133927（ＪＰ，Ａ) 特開 昭63−20137（ＪＰ，Ａ) 特開 平１−104438（ＪＰ，Ａ) 特開 平３−268838（ＪＰ，Ａ) 特開 昭59−147732（ＪＰ，Ａ) 特開 平１−215427（ＪＰ，Ａ) 特公 昭46−32730（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-1-104437 (JP, A) JP-A-50-157251 (JP, A) JP-A-59-133927 (JP, A) JP-A-63- 20137 (JP, A) JP-A-1-104438 (JP, A) JP-A-3-268838 (JP, A) JP-A-59-147732 (JP, A) JP-A-1-215427 (JP, A) Japanese Examined Sho 46-32730 (JP, B2)
Claims (1)
保持されたビレットの両端面の前記軸孔に対応する部位
にポンチを圧入し、凹部を形成する閉塞鍛造装置におい
て、 前記ポンチの先端の中央部を大径な半径の曲面とし、前
記先端の周縁部を前記中央部よりも小径な半径の曲面と
することを特徴とする閉塞鍛造装置。1. A closed forging device for forming a recess by press-fitting a punch into both end surfaces of a billet held by a die at positions corresponding to the shaft hole prior to punching the shaft hole. A closed forging device characterized in that a central portion is a curved surface having a large radius and a peripheral portion of the tip is a curved surface having a smaller radius than the central portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34525491A JP2506593B2 (en) | 1991-12-26 | 1991-12-26 | Closure forging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34525491A JP2506593B2 (en) | 1991-12-26 | 1991-12-26 | Closure forging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05177291A JPH05177291A (en) | 1993-07-20 |
| JP2506593B2 true JP2506593B2 (en) | 1996-06-12 |
Family
ID=18375353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34525491A Expired - Fee Related JP2506593B2 (en) | 1991-12-26 | 1991-12-26 | Closure forging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2506593B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7194882B2 (en) * | 2002-11-12 | 2007-03-27 | Ray Travis | Cold forging apparatus and method for forming complex articles |
| US6941782B2 (en) * | 2002-11-12 | 2005-09-13 | Ray Travis | Cold forging apparatus and method for forming complex articles |
| JP4819329B2 (en) * | 2003-07-31 | 2011-11-24 | 昭和電工株式会社 | Forging method, forged product and forging device |
| US7143624B2 (en) * | 2003-11-05 | 2006-12-05 | Paul Stone | Forging apparatus and conveyor for forming complex articles |
| JP4775017B2 (en) * | 2006-02-09 | 2011-09-21 | 日本精工株式会社 | Method for manufacturing cylindrical member with protrusion |
| DE102010036609B4 (en) | 2010-07-26 | 2016-08-11 | Thyssenkrupp Presta Aktiengesellschaft | Die for forging a toothed portion of a rack of a steering device |
| JP2020175421A (en) * | 2019-04-19 | 2020-10-29 | 日本製鉄株式会社 | Cutting work method for surface-treated steel plate |
-
1991
- 1991-12-26 JP JP34525491A patent/JP2506593B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05177291A (en) | 1993-07-20 |
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