JPH0569078A - Method for forming inner ring of constant velocity joint - Google Patents
Method for forming inner ring of constant velocity jointInfo
- Publication number
- JPH0569078A JPH0569078A JP23197091A JP23197091A JPH0569078A JP H0569078 A JPH0569078 A JP H0569078A JP 23197091 A JP23197091 A JP 23197091A JP 23197091 A JP23197091 A JP 23197091A JP H0569078 A JPH0569078 A JP H0569078A
- Authority
- JP
- Japan
- Prior art keywords
- hole
- forging
- forming
- inner ring
- billet
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
- F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
- F16D3/223—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts the rolling members being guided in grooves in both coupling parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2250/00—Manufacturing; Assembly
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、等速ジョイントの内輪
を鍛造によって成形する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an inner ring of a constant velocity joint by forging.
【０００２】[0002]
【従来の技術】従来、この種の内輪の成形方法として、
特公平２−５７４５８号公報により、第１鍛造工程にお
いて円柱状のビレットをその中心部に両端面側から凹孔
を鍛圧成形しつつ据込み成形し、第１鍛造工程で成形さ
れた中間成形品の凹孔底壁部を打抜いて貫通孔を形成し
た後、第２鍛造工程において中間成形品の貫通孔内周面
を拘束した状態で外表面をしごき成形し、かくて得られ
た製品に所要の機械加工を施して内輪を形成する方法が
知られている。2. Description of the Related Art Conventionally, as a molding method of this kind of inner ring,
According to Japanese Examined Patent Publication No. 2-57458, in the first forging step, a cylindrical billet is upset while press-forming concave holes from both end sides in the center of the billet, and an intermediate molded product formed in the first forging step. After punching the bottom wall of the recessed hole to form the through hole, the outer surface is ironed while the inner peripheral surface of the through hole of the intermediate molded product is constrained in the second forging step to obtain the product thus obtained. A method of forming an inner ring by performing required machining is known.
【０００３】[0003]
【発明が解決しようとする課題】上記の如く第１鍛造工
程において凹孔を鍛圧成形すると、後工程でのドリル加
工が不要となって生産性が向上するが、凹孔の鍛圧成形
はコーナ部を面取りした平坦な先端面を有するパンチを
用いて行うを一般とし、この場合図７に示すように、凹
孔ａの底壁コーナ部に上方への肉の流れを生じ、この肉
の流れが凹孔ａの周壁部に生ずる下方への肉の流れとぶ
つかって、コーナ部と周壁部との境界部となる図中ｂの
部分にひけを生じ易くなり、特に上記従来技術の如くビ
レットの両端面側から凹孔を鍛圧成形する場合にはこの
傾向が顕著となり、ひけが製品の内周面に欠陥として残
る不具合がある。又、第１鍛造工程における据込み成形
に際し、ビレットは中間部が樽状に膨らんで加圧方向先
端側即ち下端側の図中Ｃで示す部分が充分に拡径されな
くなる傾向があり、図１に示すように外周面の曲率中心
Ｏ1がボール案内溝の曲率中心Ｏ2に対しオフセットして
いて、Ｏ1とＯ2が一致する標準タイプのものに比し下端
面の外径Ｄが大きくなるオフセット型の内輪を成形する
場合には、据込み成形時のビレット下端部の拡径不足を
生じ易くなる。本発明は、以上の点に鑑み、凹孔の鍛圧
成形に際してのひけの発生や据込み成形に際しての拡径
不足を解消して、高精度で内輪を成形し得るようにした
方法を提供することをその目的としている。When the recessed hole is forged in the first forging step as described above, the productivity is improved by eliminating the need for drilling in the subsequent step. Is generally performed by using a punch having a chamfered flat tip surface. In this case, as shown in FIG. 7, an upward flow of meat is generated in the bottom wall corner portion of the concave hole a, and this flow of meat is The downward flow of meat generated in the peripheral wall portion of the recessed hole a collides with the concave hole a, so that sink marks are apt to occur in the portion b in the figure which is the boundary portion between the corner portion and the peripheral wall portion. This tendency becomes remarkable when the concave hole is pressure-formed from the surface side, and there is a problem that the sink mark remains as a defect on the inner peripheral surface of the product. Further, during upsetting in the first forging step, the billet tends to bulge in an intermediate portion in a barrel shape, and the portion indicated by C in the drawing on the front end side, that is, the lower end side in the pressing direction may not be sufficiently expanded in diameter. As shown in, the center of curvature O 1 of the outer peripheral surface is offset from the center of curvature O 2 of the ball guide groove, and the outer diameter D of the lower end surface is larger than that of the standard type in which O 1 and O 2 match. In the case of forming the offset type inner ring, it becomes easy to cause insufficient diameter expansion of the lower end of the billet during upsetting. In view of the above points, the present invention provides a method capable of forming an inner ring with high accuracy by eliminating the occurrence of sink marks during forging of concave holes and the lack of diameter expansion during upsetting. Is the purpose.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成すべく、
本発明方法は、円柱状のビレットをその中心部に凹孔を
鍛圧成形しつつ据込み成形して中心成形品を形成する第
１鍛造工程と、中間成形品の凹孔底壁部を打抜いて貫通
孔を形成するピアス工程と、中間成形品の貫通孔内周面
を拘束した状態で外表面をしごき成形する第２鍛造工程
とから成り、第１鍛造工程における凹孔の鍛圧成形を、
先端面を大径の曲率半径を持った曲面とし且つ先端コー
ナ部に小径のアールを付けたパンチを用い、ビレットの
据込み加圧方向尾方の端面側から片押しして行うことを
特徴とする。[Means for Solving the Problems] In order to achieve the above object,
The method of the present invention comprises a first forging step of forming a center molded product by upsetting a cylindrical billet in the center thereof while forging a concave hole, and punching out the bottom wall of the recessed hole of the intermediate molded product. And a second forging step of ironing the outer surface with the inner peripheral surface of the through hole of the intermediate molded product being constrained, and the forging forming of the concave hole in the first forging step is performed.
It is characterized in that the tip surface is a curved surface with a large radius of curvature and a punch with a small radius radius is used at the tip corner part, and the billet is pushed by pushing from the end face side in the upsetting direction. .
【０００５】[0005]
【作用】ポンチ先端面を曲面として且つ先端コーナ部に
小径のアールを付けることにより、凹孔の鍛圧成形時に
凹孔底壁部の肉がデッドメタルを生ずることなく側方に
スムーズに流れ且つ底壁コーナ部における上方への肉の
巻き込みが防止されて、肉の流れは図６に示す通りとな
り、肉が上下バランス良く外方に流れて、底壁コーナ部
における上下の流れのぶつかり合いによるひけの発生が
防止される。又、ビレットの据込み加圧方向尾方の端面
側からの片押しで凹孔を鍛圧成形するため、この鍛圧成
形荷重がビレットの加圧方圧先端側の部分に拡径力とし
て伝達されて、先端側の部分も充分に拡径され、据込み
成形の成形精度が向上する。[Function] By forming the punch tip surface as a curved surface and attaching a small radius R to the tip corner portion, the meat of the bottom wall portion of the recess hole smoothly flows to the side without forming dead metal during the press forming of the recess hole and the bottom. As the meat is prevented from being caught in the upper portion of the wall corner, the meat flows as shown in FIG. 6, and the meat flows outward in a well-balanced manner, resulting in the sinking due to the collision of the upper and lower flows in the bottom wall corner. Is prevented from occurring. Further, since the concave hole is forged by single pressing from the end face side of the billet in the upsetting direction, this forging pressure forming load is transmitted to the part of the billet on the leading end side of the pressing direction as a expanding force, The diameter on the tip side is also sufficiently expanded to improve the molding accuracy of upsetting.
【０００６】[0006]
【実施例】図示の実施例は、図１に示すように外表面に
ボール案内溝Ａと中心にセレーションを形成した軸孔Ｂ
とを有し、外周面の曲率中心Ｏ1がボール案内溝Ａの曲
率中心Ｏ2に対しオフセットしているオフセット型の内
輪の成形に本発明を適用したものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, as shown in FIG. 1, a ball guide groove A is formed on the outer surface and a shaft hole B is formed with serrations at the center.
The present invention is applied to the molding of an offset inner ring having the outer peripheral surface with the center of curvature O 1 offset from the center of curvature O 2 of the ball guide groove A.
【０００７】内輪の成形手順は以下の通りであり、即ち
図２（ａ）に示す円柱状のビレット１を第１鍛造工程
で、図２（ｂ）に示すように、中心の凹孔２ａとボール
案内溝に対応する外周の溝２ｂとを有する中間成形品２
に形成し、次にピアス工程で図２（ｃ）に示すように凹
孔２ａの底壁部を打抜いて貫通孔２ｃを形成した後、第
２鍛造工程で溝２ｂと貫通孔２ｃとを夫々ボール案内溝
Ａと軸孔Ｂとに合致する正規形状に成形し、かくて得ら
れた図２（ｄ）に示す成形品３の端面と外周面の切削加
工と軸孔Ｂのブローチ加工とを行って図１に示す内輪を
形成する。The procedure for forming the inner ring is as follows: In the first forging step, the cylindrical billet 1 shown in FIG. 2 (a) has a central recessed hole 2a as shown in FIG. 2 (b). Intermediate molded product 2 having outer peripheral groove 2b corresponding to the ball guide groove
2C, and then, in the piercing step, the bottom wall portion of the recessed hole 2a is punched out to form the through hole 2c, and then the groove 2b and the through hole 2c are formed in the second forging step. Molding into a regular shape matching the ball guide groove A and the shaft hole B, respectively, and cutting the end surface and outer peripheral surface of the molded product 3 shown in FIG. 2 (d) thus obtained and broaching the shaft hole B. Is performed to form the inner ring shown in FIG.
【０００８】第１鍛造工程においては、第３図に示すよ
うに、溝２ｂに対応する内周の歯部（図示せず）を有す
るダイ形状の下型１０と、下型１０に嵌合するパンチ形
状の上型１１とから成るプレス型を用い、下型１０にビ
レット１を挿入セットした状態で上型１１を下降させ、
ビレット１を上方から加圧して据込み成形するもので、
更に上型１１の下面にパンチ１２を突設し、該パンチ１
２によりビレット１の据込み加圧方向尾方の端面側即ち
上端面側から片押しして凹孔２ａを鍛圧成形するように
した。該パンチ１２は、図４に示すように、先端面１２
ａが大径の曲率半径を持つ曲面に形成されており、更に
先端コーナ部１２ｂに小径のアールが付けられている。
先端面１２ａの曲率半径をＲ、先端コーナ部１２ｂの曲
率半径をｒ、パンチ１２の基部の直径をｄとして、ｒは
ｄ／４程度、Ｒは６ｒ程度に設定されている。これによ
れば、凹孔２ａの鍛圧成形時の肉の流れは図６に示す通
りとなり、肉が上下にバランス良く外方に流れ、凹孔２
ａの底壁コーナ部における上方への肉の流れを生じず、
上方と下方への流れのぶつかり合いによるひけの発生が
防止される。更に、パンチ１２による上方からの鍛圧成
形荷重がビレット１の下端部に拡径力として作用し、下
端部の拡径不足を生ずることなく据込み成形が行われ
て、良好な中間成形品２が得られる。In the first forging step, as shown in FIG. 3, a die-shaped lower die 10 having inner peripheral teeth (not shown) corresponding to the groove 2b is fitted to the lower die 10. Using a press die consisting of a punch-shaped upper die 11, the upper die 11 is lowered with the billet 1 inserted and set in the lower die 10,
The billet 1 is pressed from above to perform upsetting,
Further, a punch 12 is projectingly provided on the lower surface of the upper mold 11, and the punch 1
The concave hole 2a is formed by forging by pressing the billet 1 from the end face side, that is, the upper end face side of the billet 1 in the upsetting direction. The punch 12 has a tip surface 12 as shown in FIG.
a is formed into a curved surface having a large radius of curvature, and the tip corner portion 12b is further provided with a small radius radius.
With the radius of curvature of the tip surface 12a being R, the radius of curvature of the tip corner portion 12b being r, and the diameter of the base of the punch 12 being d, r is set to about d / 4 and R is set to about 6r. According to this, the flow of the meat during the press forming of the concave hole 2a is as shown in FIG.
There is no upward flow of meat in the bottom wall corner portion of a,
The occurrence of sink marks due to the collision of the upward and downward flows is prevented. Further, the forging pressure forming load from above by the punch 12 acts on the lower end portion of the billet 1 as a diametrical expansion force, and upsetting is performed without causing insufficient diametrical expansion of the lower end portion, resulting in a good intermediate molded product 2. can get.
【０００９】第２鍛造工程においては、図５に示すよう
に、内周にボール案内溝Ａに合致する歯部２０ａを有す
るダイ形状の下型２０と、外周に下型２０の歯部間に挿
入される歯部２１ａを有する筒状のパンチ２１にマンド
レル２２を挿設して成る上型２３とで構成されるプレス
型を用い、ピアス工程で貫通孔２ｃを形成した中間成形
品２を下型２０にセットした状態で上型２３を下降さ
せ、先ず図５（ａ）に示すようにマンドレル２２を貫通
孔２ｃに挿通し、次いで中間成形品２をその上端面への
パンチ２１の当接で図５（ｂ）に示すように下型２０に
押込み、貫通孔内周面をマンドレル２２で拘束した状態
で外表面をしごき成形する。これによれば、溝２ｂが歯
部２０ａによってボール案内溝Ａに合致する形状に、又
貫通孔２ｃが軸孔Ｂに合致する形状に夫々成形される。
この場合、中間成形品２の下端部が充分に拡径されてい
ないと、しごき成形に際し下端部の絞り率が低下して成
形精度が悪くなるが、本実施例によれば第１鍛造工程で
下端部の拡径不足を生ずることなく中間成形品２を成形
できるため、第２鍛造工程での成形品３の成形精度が向
上し、図１に示すような下端の径Ｄの大きなオフセット
型の内輪も精度良く成形できるようになる。図中２４は
下型２０に挿設したノックアウトである。In the second forging step, as shown in FIG. 5, a die-shaped lower die 20 having a tooth portion 20a matching the ball guide groove A on the inner circumference and a tooth portion of the lower die 20 on the outer circumference. A press die composed of an upper die 23 formed by inserting a mandrel 22 into a cylindrical punch 21 having tooth portions 21a to be inserted is used to lower an intermediate molded product 2 having a through hole 2c formed in a piercing process. The upper mold 23 is lowered with the mold 20 set, and the mandrel 22 is first inserted into the through hole 2c as shown in FIG. 5A, and then the intermediate molded product 2 is brought into contact with the punch 21 at its upper end surface. Then, as shown in FIG. 5B, the outer surface is ironed while the inner peripheral surface of the through hole is constrained by the mandrel 22 while being pushed into the lower mold 20. According to this, the groove 2b is formed by the tooth portion 20a into a shape that matches the ball guide groove A, and the through hole 2c is formed into a shape that matches the shaft hole B.
In this case, if the lower end portion of the intermediate molded product 2 is not sufficiently expanded in diameter, the draw ratio of the lower end portion decreases during ironing forming and the forming accuracy deteriorates. However, according to the present embodiment, in the first forging step. Since the intermediate molded product 2 can be molded without causing the diameter expansion of the lower end portion to be insufficient, the molding accuracy of the molded product 3 in the second forging step is improved, and an offset mold having a large lower end diameter D as shown in FIG. The inner ring can also be molded accurately. In the figure, 24 is a knockout inserted in the lower mold 20.
【００１０】[0010]
【発明の効果】以上の説明から明らかなように、本発明
によれば、第１鍛造工程において中間成形品にひけを生
ずることなく凹孔を鍛圧成形でき、ひけによる欠陥の無
い内輪を得られると共に、中間成形品を据込み加圧方向
先方の端部の拡径不足を生ずることなく精度良く据込み
成形でき、オフセット型の内輪も精度良く成形できる効
果を有する。As is apparent from the above description, according to the present invention, the recessed hole can be pressure-formed in the first forging step without causing a sink mark in the intermediate molded product, and an inner ring having no defect due to a sink mark can be obtained. At the same time, there is an effect that the intermediate molded product can be accurately upset-molded without causing the diameter expansion of the end portion on the forward side in the upsetting direction, and the offset inner ring can also be accurately molded.
【図１】 本発明方法によって成形する内輪の縦断面図FIG. 1 is a longitudinal sectional view of an inner ring formed by the method of the present invention.
【図２】 （ａ）（ｂ）（ｃ）（ｄ）は本発明方法によ
る成形手順を示す図2 (a), (b), (c) and (d) are views showing a molding procedure according to the method of the present invention.
【図３】 第１鍛造工程での成形状態を示す図FIG. 3 is a diagram showing a forming state in the first forging step.
【図４】 凹孔を鍛圧成形するパンチの拡大図FIG. 4 is an enlarged view of a punch for press forming a concave hole.
【図５】 （ａ）（ｂ）は第２鍛造工程での成形状態を
示す図5 (a) and 5 (b) are views showing a molding state in a second forging step.
【図６】 本発明方法による凹孔の鍛圧成形時の肉の流
れを示す図FIG. 6 is a diagram showing the flow of meat during the press forming of the concave hole by the method of the present invention.
【図７】 従来のパンチを用いた凹孔の鍛圧成形時の肉
の流れを示す図FIG. 7 is a diagram showing the flow of meat during press forming of a concave hole using a conventional punch.
１ ビレット ２ 中間成形品 ２ａ 凹孔 ２ｃ 貫通孔 １２ パンチ １２ａ パンチ先端面 １２ｂ 先端コーナ部 1 Billet 2 Intermediate Formed Product 2a Recessed Hole 2c Through Hole 12 Punch 12a Punch Tip Surface 12b Tip Corner
Claims (1)
あって、円柱状のビレットをその中心部に凹孔を鍛圧成
形しつつ据込み成形して中間成形品を形成する第１鍛造
工程と、中間成形品の凹孔底壁部を打抜いて貫通孔を形
成するピアス工程と、中間成形品の貫通孔内周面を拘束
した状態で外表面をしごき成形する第２鍛造工程とから
成り、第１鍛造工程における凹孔の鍛圧成形を、先端面
を大径の曲率半径を持った曲面とし且つ先端コーナ部に
小径のアールを付けたパンチを用い、ビレットの据込み
加圧方向尾方の端面側から片押しして行うことを特徴と
する等速ジョイントの内輪の成形方法。1. A method for forming an inner ring of a constant velocity joint, comprising a first forging step of forming a cylindrical billet by press forming a concave hole in the center thereof and upsetting while forming an intermediate molded product. A piercing step of punching the bottom wall of the recessed hole of the intermediate molded product to form a through hole, and a second forging process of ironing the outer surface of the intermediate molded product with the inner peripheral surface of the through hole constrained. In the forging forming of the concave hole in the first forging step, a punch having a curved tip surface with a large radius of curvature and a small radius at the tip corner portion is used to adjust the billet upsetting direction. A method for molding an inner ring of a constant velocity joint, which is performed by pushing from one end face side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23197091A JP2844275B2 (en) | 1991-09-11 | 1991-09-11 | Method of forming inner ring of constant velocity joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23197091A JP2844275B2 (en) | 1991-09-11 | 1991-09-11 | Method of forming inner ring of constant velocity joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0569078A true JPH0569078A (en) | 1993-03-23 |
| JP2844275B2 JP2844275B2 (en) | 1999-01-06 |
Family
ID=16931906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23197091A Expired - Fee Related JP2844275B2 (en) | 1991-09-11 | 1991-09-11 | Method of forming inner ring of constant velocity joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2844275B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001334342A (en) * | 2000-05-26 | 2001-12-04 | Honda Motor Co Ltd | Inner ring of constant velocity joint, and forging die device thereof |
| CN112743020A (en) * | 2020-12-09 | 2021-05-04 | 贵阳万江航空机电有限公司 | Method for processing elongated hole part by cold heading process |
| CN117444137A (en) * | 2023-12-25 | 2024-01-26 | 宁波凯敏盛机械有限公司 | Machining method of finish forging assembly line for front and back groove star-shaped sleeves |
-
1991
- 1991-09-11 JP JP23197091A patent/JP2844275B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001334342A (en) * | 2000-05-26 | 2001-12-04 | Honda Motor Co Ltd | Inner ring of constant velocity joint, and forging die device thereof |
| CN112743020A (en) * | 2020-12-09 | 2021-05-04 | 贵阳万江航空机电有限公司 | Method for processing elongated hole part by cold heading process |
| CN112743020B (en) * | 2020-12-09 | 2022-11-15 | 贵阳万江航空机电有限公司 | Method for processing elongated hole part by using cold heading process |
| CN117444137A (en) * | 2023-12-25 | 2024-01-26 | 宁波凯敏盛机械有限公司 | Machining method of finish forging assembly line for front and back groove star-shaped sleeves |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2844275B2 (en) | 1999-01-06 |
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