JPH0562007B2

JPH0562007B2 -

Info

Publication number: JPH0562007B2
Application number: JP7809784A
Authority: JP
Inventors: Sadao Ikeda; Koichi Mine
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 1984-04-18
Filing date: 1984-04-18
Publication date: 1993-09-07
Also published as: JPS60221144A

Description

【発明の詳細な説明】（産業上の利用分野）本発明は、クロス溝を有する自在継手、即ちレ
ブロジヨイントの外輪の製造方法および製造装置
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing an outer ring of a universal joint having cross grooves, that is, a reversible joint.

（従来技術）従来のこの種のレブロジヨイントの外輪は、ク
ロス溝を有するアウタレースとシヤフトの２部品
から成つており、これを分類するに、第１図およ
び第２図に示すような、ボルト（図示せず）をボ
ルト穴１に通しアウタレース２とシヤフト３をパ
ツキン４を介して締結する様式の外輪と、第３図
に示すような、アウタレース２′とシヤフト３′を
摩擦溶接する様式の外輪に大別される。いずれの
様式の外輪の場合も、アウタレース２，２′のク
ロス溝５の成形は一溝または二溝ずつ切削加工
（例えばブローチ加工）や研削加工によつて行な
われており、成形に多くの時間を要し、生産性が
悪く、製造コスト高の大きな要因となつていた。
しかも、アウタレースとシヤフトをボルト締結す
る様式の外輪では、ボルト穴を必要とするため、
アウタレースの外径が一般に大きくなり、相対的
に大重量のものとなつていた。また、アウタレー
スとシヤフトを摩擦溶接する様式の外輪では、溶
接しろを必要とかつ溶接バリ等の発生もあり、軸
方向に長い形状のものとなつていた。また、溶接
熱によつて膨張や変形することがあり、また接合
時にアウタレースとシヤフトの間に芯ずれ等が起
きることもあり、この様式の外輪の精度は、一般
にボルト締結様式の外輪のそれより悪いものであ
つた。(Prior Art) The conventional outer ring of this type of rebroad joint consists of two parts: an outer race with cross grooves and a shaft. (not shown) is passed through the bolt hole 1 and the outer race 2 and shaft 3 are fastened together via the packing 4, and the outer race 2' and shaft 3' are friction welded together as shown in Fig. 3. Broadly classified. In the case of any type of outer ring, the cross grooves 5 of the outer races 2, 2' are formed by cutting one or two grooves at a time (for example, broaching) or grinding, which takes a lot of time. This was a major factor in high manufacturing costs, resulting in poor productivity.
Moreover, the outer race and shaft are bolted together, which requires bolt holes.
Generally, the outer diameter of the outer race has become larger, making it relatively heavier. In addition, the outer ring of the type in which the outer race and the shaft are friction welded requires a welding margin, generates weld burrs, etc., and has a long shape in the axial direction. In addition, it may expand or deform due to welding heat, and misalignment may occur between the outer race and the shaft during joining, so the accuracy of this type of outer ring is generally higher than that of a bolted type outer ring. It was bad.

（発明の目的）本発明は、前記の事情を考慮してなされたもの
で、その目的の一は、生産性が格段に向上し製造
コストが大幅に軽減され、しかも軽量かつ小型化
が図られ、さらに高精度なレブロジヨイントの外
輪の製造方法を提供することにある。(Objectives of the Invention) The present invention has been made in consideration of the above-mentioned circumstances, and one of its objects is to significantly improve productivity, significantly reduce manufacturing costs, and achieve lightweight and compact design. Another object of the present invention is to provide a method for manufacturing an outer ring of a rebroad joint with even higher precision.

本発明の他の目的は、前記の目的を達成するの
に有用なレブロジヨイントの外輪の製造装置を提
供することにある。 Another object of the present invention is to provide an apparatus for manufacturing an outer ring of a rebro joint that is useful for achieving the above-mentioned objects.

（発明の構成）本発明のレブロジヨイントの外輪の製造方法
は、鍛造成形により、すなわち略外輪形状の素形
材を上方および全方位の側方より同時に肉寄せす
ることにより、一体の外輪を製造する方法で、ク
ロス溝の切削加工を不要にしたものである。より
詳細に述べるに、略外輪形状の素形材を、外周に
複数のクロス溝型を斜めに配設したマンドレルポ
ンチに被せ、かつ該素形材の上部を該ポンチ上方
の押え型の外輪軸部に対応する型面内に収め、し
かる後押え型を下方へ加圧せしめると同時に、外
輪の円筒部外面の各部分に対応する型面を形成す
る前記ポンチ周囲の複数の成形型を、マンドレル
ポンチ外周に接近させ前記素形材にプレスせしめ
ることを特徴とするものである。(Structure of the Invention) The method for manufacturing an outer ring of a rebro joint of the present invention is to manufacture an integral outer ring by forging, that is, by simultaneously filling a substantially outer ring-shaped material from above and from the sides in all directions. This method eliminates the need for cutting cross grooves. In more detail, a material having a substantially outer ring shape is placed over a mandrel punch having a plurality of cross grooves diagonally arranged on the outer periphery, and the upper part of the material is placed on the outer ring shaft of the holding mold above the punch. At the same time, a plurality of molds around the punch, which form mold surfaces corresponding to each part of the outer surface of the cylindrical portion of the outer ring, are placed on a mandrel and the presser mold is pressed downward. This is characterized in that the punch is brought close to the outer periphery of the punch and pressed against the formed material.

また、本発明のレブロジヨイントの外輪の製造
装置は、前記の製造方法を実施するのに適する装
置で、固定下型および昇降可能な可動上型と、略
外輪形状の素形材を被せるための、前記下型に固
定したマンドレルポンチと、該ポンチの外周に
夫々斜めに昇降可能に配設した型で、各外側表面
に外輪のクロス溝に対応する型面を形成する複数
のクロス溝型と、前記下型よりマンドレルポンチ
上面まで延設したノツクアウトと、前記マンドレ
ルポンチの上方にて前記上型に下方へ加圧可能に
支持した型で、下端内部に外輪の軸部に対応する
型面を形成する押え型と、前記マンドレルポンチ
の周囲に同ポンチに対し接近、離間可能に夫々配
置した型で、該ポンチ側表面に外輪の円筒部外面
の各部分に対応する型面を形成する複数の成形型
と、前記上型の下降によつて、該成形型をマンド
レルポンチ外周に接近させ前記素形材にプレスせ
しめるプレス手段を有してなることを特徴とする
ものである。 Furthermore, the apparatus for manufacturing an outer ring of a rebroad joint according to the present invention is an apparatus suitable for carrying out the above-described manufacturing method, and includes a fixed lower mold, a movable upper mold that can be raised and lowered, and a mold for covering a material having a substantially outer ring shape. a mandrel punch fixed to the lower mold; and a plurality of cross groove molds each of which is disposed on the outer periphery of the punch so as to be able to rise and fall diagonally, forming mold surfaces corresponding to the cross grooves of the outer ring on each outer surface; A knockout extending from the lower mold to the upper surface of the mandrel punch, and a mold supported above the mandrel punch so as to be able to press downwardly against the upper mold, form a mold surface corresponding to the shaft of the outer ring inside the lower end. and a plurality of molds arranged around the mandrel punch so as to be able to approach and separate from the punch, and forming a mold surface corresponding to each part of the outer surface of the cylindrical portion of the outer ring on the punch side surface. The present invention is characterized by comprising a mold and a pressing means for bringing the mold close to the outer periphery of the mandrel punch and pressing the molded material by lowering the upper mold.

（実施例）以下、本発明の実施例を図面により説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第４図および第５図は、実施例の外輪の製造装
置を示す。６は、固定下型を示し、７は昇降可能
な可動上型を示す。下型６の中央には、略円柱形
のマンドレルポンチ８が固定されており、このマ
ンドレルポンチ８は、略外輪形状の素形材を被せ
るためのもので、その外周には、６個のクロス溝
型９……が斜めにかつ規則的に嵌合溝１０……と
夫々嵌合して配設されている（第５図に示すよう
に、第４図の−の位置では、クロス溝型９…
…は等しく配置されている）。各クロス溝型９は、
その外側表面に外輪のクロス溝に対応する凸面の
型面１１を形成し、また下型６に取付けたシリン
ダ１２と接続されており、油圧ユニツト（図示せ
ず）によるシリンダ１２の運動によつて斜めにポ
ンチ外周上を昇降するようになつている。また、
マンドレルポンチ８および下型６にはノツクアウ
ト孔１３が軸方向に穿設され、該孔１３には上部
がフランジ上となつたノツクアウト１４が嵌挿さ
れており、このノツクアウト１４は、下型６に取
付けたシリンダ１５と接続されており、油圧ユニ
ツト（図示せず）によるシリンダ１５の運動によ
つて軸方向に昇降するようになつている。ノツク
アウトは、下型よりマンドレルポンチ上面まで延
設されたものであればよく、その形状や配置は限
定されない。 FIGS. 4 and 5 show an apparatus for manufacturing an outer ring according to an embodiment. 6 indicates a fixed lower die, and 7 indicates a movable upper die that can be raised and lowered. A substantially cylindrical mandrel punch 8 is fixed at the center of the lower mold 6, and this mandrel punch 8 is used to cover a material having a substantially outer ring shape. The grooves 9 are disposed diagonally and regularly fitted into the fitting grooves 10 (as shown in Fig. 5, at the - position in Fig. 4, the cross grooves are 9...
...are equally spaced). Each cross groove type 9 is
A convex mold surface 11 corresponding to the cross groove of the outer ring is formed on its outer surface, and it is connected to a cylinder 12 attached to the lower mold 6, and is operated by the movement of the cylinder 12 by a hydraulic unit (not shown). It is designed to move up and down diagonally on the outer circumference of the punch. Also,
A knockout hole 13 is formed in the axial direction in the mandrel punch 8 and the lower mold 6, and a knockout 14 whose upper part is on the flange is inserted into the hole 13. It is connected to the attached cylinder 15, and is moved up and down in the axial direction by movement of the cylinder 15 by a hydraulic unit (not shown). The knockout may extend from the lower mold to the upper surface of the mandrel punch, and its shape and arrangement are not limited.

マンドレルポンチ８の周面近傍には、ポンチ固
定用のマンドレル押え型１６が固定され、その外
側には、スライドプレート１７が固定されてい
る。押え型１６とプレート１７の両上面は同じ高
さに位置している。この押え型１６およびプレー
ト１７の上側において、第５図に示すように、マ
ンドレルポンチ８の周囲には、６個の成形型１８
……が互い60度の角度間隔で規則的に配置されて
おり、この成形型１８は、ポンチ側表面に外輪の
円筒部外面の各部分に対応する型面１９を形成
し、かつその外側に設置した受動型２０に固定さ
れている。各受動型２０は、ロツド２１を介して
下型６中のバネやシリンダ（図示せず）に接続さ
れており、外方へ引寄せられている。また、各受
動型２９間には、扇形の案内型２２が受動型２０
と当接して固定されている。また、各受動型２０
は、マンドレルポンチと反対側にて、上型７の下
面に固定した寄せ型２３と摺動し合つており、こ
の摺動面２４は第４図に示すような傾斜面になつ
ている。したがつて、上型７の下降時には、寄せ
型２３が、ロツド２１に負荷される引力に抗し
て、受動型２０（成形型１８）をマンドレルポン
チ外周へ近接せしめるようになつている。成形型
は、マンドレルポンチの外周に対し接近、離間可
能に配置されたものであればよく、その数や配置
様式などは限定されない。また、上型の下降によ
つて成形型をマンドレルポンチ外周に接近させ、
素形材が該ポンチに被せられているときには該素
形材にプレスせしめるプレス手段は、前記の実施
例における寄せ型等に限定されない。 A mandrel presser die 16 for fixing the punch is fixed near the peripheral surface of the mandrel punch 8, and a slide plate 17 is fixed on the outside thereof. Both upper surfaces of the presser die 16 and the plate 17 are located at the same height. Above the presser mold 16 and the plate 17, six molds 18 are arranged around the mandrel punch 8, as shown in FIG.
... are arranged regularly at angular intervals of 60 degrees from each other, and this mold 18 has a mold surface 19 corresponding to each part of the outer surface of the cylindrical portion of the outer ring on the punch side surface, and a mold surface 19 on the outside thereof. It is fixed to the installed passive type 20. Each passive mold 20 is connected to a spring or cylinder (not shown) in the lower mold 6 via a rod 21, and is drawn outward. Further, between each passive type 29, a fan-shaped guide mold 22 is placed between the passive types 29.
It is fixed in contact with the In addition, each passive type 20
slides with a latch mold 23 fixed to the lower surface of the upper mold 7 on the opposite side from the mandrel punch, and this sliding surface 24 is an inclined surface as shown in FIG. Therefore, when the upper die 7 is lowered, the moving die 23 resists the attractive force applied to the rod 21 and brings the passive die 20 (forming die 18) closer to the outer periphery of the mandrel punch. The molds may be arranged so that they can approach or separate from the outer periphery of the mandrel punch, and their number and arrangement are not limited. Also, by lowering the upper mold, the mold is brought closer to the outer periphery of the mandrel punch,
When the blank material is placed on the punch, the pressing means for pressing the blank material is not limited to the latch type or the like in the above-described embodiment.

一方、上型７には、マンドレルポンチ８の上方
において、押え型室２５が嵌合穴２６を介して外
部と連通して形成され、該押え型室２５には、押
え型２７が、上部のパツキン２８を介して昇降自
在に、かつその下端部を嵌合穴２６に嵌挿して収
められている。押え型室２５にはプレス油が充填
されており、したがつて押え型２７は、プレス油
に負荷される油圧によつて、下方のマンドレルポ
ンチ上面へ加圧可能となつている。押え型２７の
下端内部には、外輪の軸部に対応する型面２９が
形成されている。また、押え型２７の上部内部に
は、払い室３０が、嵌合孔３１を介して型面２９
の内部と連通して形成されており、該払い室３０
には払い３２がその下部軸を嵌合孔３１に嵌挿し
て収められている。押え型上面に固定したバネ押
え具３３と払い上部のバネ穴３４の間には、バネ
３５が介装されており、このバネ３５は、払い３
２を下方へ付勢している。 On the other hand, a presser die chamber 25 is formed in the upper die 7 above the mandrel punch 8 and communicates with the outside via a fitting hole 26, and a presser die 27 is placed in the upper mold chamber 25. It is movable up and down via a gasket 28, and is housed with its lower end fitted into the fitting hole 26. The presser die chamber 25 is filled with press oil, so that the presser die 27 can be pressurized against the upper surface of the mandrel punch below by the hydraulic pressure applied to the press oil. A mold surface 29 corresponding to the shaft portion of the outer ring is formed inside the lower end of the presser mold 27 . Further, a cleaning chamber 30 is provided inside the upper part of the presser mold 27 through a fitting hole 31 to form a mold surface 29.
It is formed in communication with the inside of the paying room 30.
A brush 32 is housed with its lower shaft inserted into the fitting hole 31. A spring 35 is interposed between the spring presser 33 fixed to the upper surface of the presser die and the spring hole 34 in the upper part of the wiper.
2 is biased downward.

次に、以上の構成からなる製造装置を用いてレ
ブロジヨイントの外輪を製造する方法を述べる
に、予め第６図に示すような略外輪形状の素形材
３６を準備しておき、まず素形材３６を、外周に
クロス溝型９……を斜めに配設したマンドレルポ
ンチ８の上に被せ、次に上型７を第４図に示すよ
うに押え型下端が素形材と当接する位置まで下降
させて、素形材３６の上部を押え型２７の型面内
に収める。このとき、素形材３６の上端は、払い
３２と接触しており、バネ３５の弾発力によつて
下方へ押圧されている。しかる後、上型７を更に
下降させると、押え型２７は押え型室内の油の圧
力により下方へ加圧し（この圧力は図示しない弁
によつて一定に調整される）、これと同時に寄せ
型２３……が受動型２０……を押圧し、成形型１
８……がマンドレルポンチ８の外周近傍に寄せら
れ素形材３６をポンチ周囲の全方位から同時にプ
レスする。すると、素形材３６の円筒部は、成形
型１８とクロス溝型９およびマンドレルポンチ８
の間に挟まれ圧縮され、その一部は下方に伸びマ
ンドレル押え型１６の上面に当接する。これと共
に、素形材３６の上部は上方へ軸方向に伸び押え
型２７の型面内部を満たすように変形し、この結
果第７図に示すような、円筒部内面に６溝のクロ
ス溝５……を形成する外輪３７が形成される。 Next, to describe a method for manufacturing the outer ring of a rebroad joint using the manufacturing apparatus having the above configuration, first prepare a material 36 having a substantially outer ring shape as shown in FIG. 36 on top of the mandrel punch 8 which has a cross groove mold 9 diagonally arranged on its outer periphery, and then press the upper mold 7 until the lower end of the presser mold comes into contact with the material to be formed, as shown in Fig. 4. It is lowered to fit the upper part of the molded material 36 into the mold surface of the presser mold 27. At this time, the upper end of the material 36 is in contact with the wiper 32 and is pressed downward by the elastic force of the spring 35. After that, when the upper die 7 is further lowered, the presser die 27 is pressurized downward by the pressure of the oil in the presser die chamber (this pressure is regulated to a constant level by a valve not shown), and at the same time, the presser die 27 is pressed down. 23... presses the passive mold 20..., forming mold 1
8... are brought to the vicinity of the outer periphery of the mandrel punch 8 and simultaneously press the formed material 36 from all directions around the punch. Then, the cylindrical part of the material 36 is formed by the forming die 18, the cross groove die 9, and the mandrel punch 8.
A part of the mandrel presser mold 16 extends downward and comes into contact with the upper surface of the mandrel presser mold 16. At the same time, the upper part of the material 36 is deformed to extend upward in the axial direction and fill the inside of the mold surface of the presser mold 27, and as a result, six cross grooves are formed on the inner surface of the cylindrical part as shown in FIG. An outer ring 37 is formed.

而して、上型７を昇降させると、寄せ型２３…
…の上昇に伴つて成形型１８……がマンドレルポ
ンチ８より外方へ離間する。この間、成形した外
輪３７は、押え型室２５の油圧が負荷されてお
り、加圧状態が維持されている。さらに上型７の
上昇を続けると、押え型２７も運動して上昇し始
め、成形外輪３７は払い３２に負荷されるバネ３
５の力によつて押え型２７の型面２９より離れマ
ンドレルポンチ８上に残る。しかる後、クロス溝
型９……をシリンダ１２……の運動により型同士
干渉しないように１個または２個ずつ順次下降さ
せ、次いでノツクアウト１４をシリンダ１５の運
動により上昇させ成形外輪３７をマンドレルポン
チ８より離し装置より取出す。そして、取出した
成形外輪３７の円筒部にブーツ溝３８を切削加工
によつて形成すると共に、その軸部に所定の切削
加工を施すことにより、第８図および第９図に示
すようなレブロジヨイントの外輪３９が完成す
る。 Then, when the upper die 7 is raised and lowered, the moving die 23...
As the molds 18 rise, the molds 18 move away from the mandrel punch 8. During this time, the molded outer ring 37 is loaded with the hydraulic pressure of the holding die chamber 25 and is maintained in a pressurized state. As the upper mold 7 continues to rise, the presser mold 27 also moves and begins to rise, and the molding outer ring 37 is moved by the spring 3 that is loaded on the wiper 32.
It is separated from the die surface 29 of the presser die 27 by the force of 5 and remains on the mandrel punch 8. Thereafter, the cross-groove molds 9 are sequentially lowered one or two at a time by the movement of the cylinders 12 so as not to interfere with each other, and then the knockout 14 is raised by the movement of the cylinder 15, and the molded outer ring 37 is punched with a mandrel punch. Take it out from the release device from 8. Then, a boot groove 38 is formed in the cylindrical portion of the molded outer ring 37 taken out by cutting, and a predetermined cutting process is applied to the shaft portion, thereby forming a rev joint as shown in FIGS. 8 and 9. The outer ring 39 is completed.

（発明の効果）以上説明したように、本発明のレブロジヨイン
トの外輪の製造方法は、略外輪形状の素形材を上
方および側方より鍛造成形して一体の外輪を製造
とする方法としたことにより、従来におけるクロ
ス溝の切削加工およびアウタレースとシヤフトの
結合が不要となり、外輪の生産性が著しく向上
し、かつボルト穴を設けずともよいため、外輪円
筒部を肉薄にでき、しかも溶接しろ、溶接ばり等
も無く、外輪の軽量小型化を図ることができる。
さらに、一体成形法であるため、外輪の軸部と円
筒部の芯ずれも無く、高精度な外輪を製造するこ
とができる。(Effects of the Invention) As explained above, the method for manufacturing the outer ring of the reversible joint of the present invention is a method in which a material having a substantially outer ring shape is forged from above and from the side to manufacture an integral outer ring. This eliminates the need for conventional cutting of cross grooves and coupling of the outer race and shaft, significantly improving the productivity of the outer ring, and eliminating the need to provide bolt holes, which allows the outer ring cylindrical part to be made thinner, without welding. There is no welding burr, etc., and the outer ring can be made lighter and smaller.
Furthermore, since it is an integral molding method, there is no misalignment between the shaft portion and the cylindrical portion of the outer ring, and a highly accurate outer ring can be manufactured.

また、本発明のレブロジヨイントの外輪の製造
装置は、一回の鍛造成形により一体の外輪を製造
する装置であり、前記の如き軽量かつ小型で高精
度な外輪を迅速に量産することができる。 Furthermore, the apparatus for manufacturing an outer ring of a rebroad joint according to the present invention is an apparatus for manufacturing an integral outer ring through one-time forging, and can quickly mass-produce the above-mentioned lightweight, compact, and highly accurate outer ring.

[Brief explanation of the drawing]

第１図は従来のボルト締結様式のレブロジヨイ
ント外輪を示す正面図、第２図は第１図の外輪を
示す部分断面図（第１図の−線における断面
図）、第３図は従来の摩擦溶接様式のレブロジヨ
イント外輪を示す断面図、第４図は本発明の一実
施例のレブロジヨイント外輪の製造方法の実施に
有用な製造装置を示す断面図（第５図の−線
における断面図）、第５図は第４図の−線に
おける断面図、第６図は前記実施例で用いる素形
材を示す部分断面図、第７図は前記実施例による
鍛造成形後の外輪を示す部分断面図、第８図は完
成したレブロジヨイントの外輪を示す正面図、第
９図は第８図の外輪を示す部分断面図（第８図の
−線における断面図）である。図中、５……クロス溝、６……固定下型、７…
…可動上型、８……マンドレルポンチ、９……ク
ロス溝型、１１……クロス溝に対応する型面、１
４……ノツクアウト、１８……成形型、１９……
外輪円筒部の外面各部分に対応する型面、２７…
…押え型、２９……外輪軸部に対応する型面、３
６……素形材、３９……外輪。 Figure 1 is a front view showing the outer ring of a conventional bolt-fastened rev joint, Figure 2 is a partial cross-sectional view of the outer ring in Figure 1 (cross-sectional view taken along the - line in Figure 1), and Figure 3 is a conventional friction joint outer ring. FIG. 4 is a cross-sectional view showing a welded rebroad joint outer ring; FIG. 5 is a sectional view taken along the - line in FIG. 4, FIG. 6 is a partial sectional view showing the formed material used in the embodiment, and FIG. 7 is a partial sectional view showing the outer ring after forging according to the embodiment. FIG. 8 is a front view showing the outer ring of the completed rebro joint, and FIG. 9 is a partial sectional view (cross-sectional view taken along the - line in FIG. 8) showing the outer ring of FIG. 8. In the figure, 5...Cross groove, 6...Fixed lower mold, 7...
...Movable upper die, 8...Mandrel punch, 9...Cross groove mold, 11...Mold surface corresponding to the cross groove, 1
4... Knockout, 18... Molding mold, 19...
Mold surfaces corresponding to each part of the outer surface of the outer ring cylindrical portion, 27...
... Holder die, 29... Mold surface corresponding to the outer ring shaft portion, 3
6...Material material, 39...Outer ring.

Claims

[Scope of Claims] 1. A method for manufacturing an outer ring of a rebro joint by forging, in which a material having a substantially outer ring shape is placed over a mandrel punch having a plurality of cross grooves diagonally arranged on the outer periphery, and the material is manufactured by forging. The upper part of the material is placed in the mold surface corresponding to the outer ring shaft of the presser mold above the punch, and then the presser mold is pressed downward, and at the same time, the mold surface corresponding to each part of the outer surface of the cylindrical portion of the outer ring is placed. A method for manufacturing an outer ring of a rebro joint, characterized in that a plurality of molds around the punch forming the punch are brought close to the outer periphery of the mandrel punch and pressed against the formed material. 2. An apparatus for manufacturing the outer ring of a rebro joint by forging, which includes a fixed lower mold, a movable upper mold that can be raised and lowered, a mandrel punch fixed to the lower mold for covering a material having a substantially outer ring shape, and a mandrel punch fixed to the lower mold, and A plurality of cross groove molds are arranged on the outer periphery so as to be able to rise and fall diagonally, and a plurality of cross groove molds form a mold surface corresponding to the cross grooves of the outer ring on each outer surface, and a knockout extending from the lower mold to the upper surface of the mandrel punch. , a presser mold supported above the mandrel punch so as to be able to press downwardly against the upper mold, and forming a mold surface corresponding to the shaft portion of the outer ring inside the lower end; and a presser mold around the mandrel punch. approaching,
A plurality of molds are arranged so as to be separated from each other and form a mold surface corresponding to each part of the outer surface of the cylindrical portion of the outer ring on each punch side surface, and by lowering the upper mold,
An apparatus for manufacturing an outer ring of a rebro joint, comprising a press means for bringing the mold close to the outer periphery of a mandrel punch and pressing it against the formed material.