JP3418362B2 - Manufacturing method of outer spherical ring - Google Patents
Manufacturing method of outer spherical ringInfo
- Publication number
- JP3418362B2 JP3418362B2 JP24697699A JP24697699A JP3418362B2 JP 3418362 B2 JP3418362 B2 JP 3418362B2 JP 24697699 A JP24697699 A JP 24697699A JP 24697699 A JP24697699 A JP 24697699A JP 3418362 B2 JP3418362 B2 JP 3418362B2
- Authority
- JP
- Japan
- Prior art keywords
- outer diameter
- ring
- spherical
- cylindrical material
- punch
- 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
- Forging (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、外径側球面形状リ
ングの製造方法、詳しくは、外径面が球面状に膨出した
外径側球面形状リングを冷間鍛造により製造する方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an outer diameter side spherical shape ring, and more particularly to a method for manufacturing an outer diameter side spherical shape ring whose outer diameter surface bulges in a spherical shape by cold forging.
【０００２】[0002]
【従来の技術】この種の外径側球面形状リングの従来の
製造方法としては、図８に示す如く、半割状の球面成形
面５１ａと中央突出軸部５１ｂを有する固定ダイ５１
と、該固定ダイ５１に対して相対するように設けられ、
かつ上記半割状の球面成形部５１ａと対称形状の半割球
面成形部５２ａと中央突出軸部５２ｂを有するパンチ５
２とを備えた鍛造装置を用いて、予め予備成形工程で形
成された円盤状素材を上記固定ダイ５１とパンチ５２で
圧縮することにより、前記両突出軸部５１ｂ，５２ｂで
円盤状素材を軸方向両端面側から圧縮して、素材の中心
部に相対向する二つの穴部を形成するとゝもに、外周部
をダイ５１とパンチ５２に設けられた両半割球面成形部
５１ａ，５２ａ内に膨出させて外周を球面形状に、また
素材中心の両穴部間に余肉部を有する外径側球面形状の
鍛造部材５４’を形成し、次いで、前記鍛造部材５４’
の両穴部間の余肉部を打ち抜いて貫通孔５３をあけ、外
径側球面形状リング５４を形成している。2. Description of the Related Art As a conventional manufacturing method of this type of outer diameter side spherical ring, as shown in FIG. 8, a fixed die 51 having a half-shaped spherical molding surface 51a and a central protruding shaft portion 51b.
And is provided so as to face the fixed die 51,
Further, the punch 5 has the half-spherical spherical molding portion 51a, the symmetrical half-spherical spherical molding portion 52a, and the central protruding shaft portion 52b.
Using a forging machine equipped with 2 and 2, the disk-shaped material previously formed in the preforming step is compressed by the fixed die 51 and the punch 52, so that the disk-shaped material is axially supported by the projecting shafts 51b and 52b. By compressing from both end sides in the direction to form two holes facing each other in the center of the material, the outer peripheral parts are formed inside the half-spherical surface forming parts 51a and 52a provided on the die 51 and the punch 52. To form an outer diameter side spherical forged member 54 'having a spherical shape on the outer periphery and a surplus portion between both holes at the center of the material, and then the forged member 54'.
The outer diameter side spherical ring 54 is formed by punching out the through hole 53 by punching out the excess thickness portion between the both hole portions.
【０００３】しかし、上記のような従来の外径側球面形
状リングの製造方法では、円盤状素材の外周部を球面形
状に成形する際に、素材の固定ダイ５１とパンチ５２と
の合わせ面に対応する部分に、図９に示すような円周方
向の帯状突起物（ばり）５５が発生し、また上記鍛造部
材５４’の両穴部間の余肉部を打ち抜く際に、両突出軸
部５１ｂ，５２ｂで形成された二つの穴部と打ち抜き後
の貫通孔５３部との境界に段差５６が発生する。そのた
め、鍛造加工後に、上記外径面側の帯状突起物５５や内
径面側の貫通孔部の段差５６を除去するための夫々の切
削加工を別に行う必要があり、生産性が悪く、また切削
加工費が別に必要になるため製造コストが高くなるとい
った問題があった。However, in the conventional method for manufacturing the outer diameter side spherical ring as described above, when the outer peripheral portion of the disk-shaped material is formed into a spherical shape, the mating surface between the fixed die 51 and the punch 52 of the material is made. Circumferential band-shaped protrusions (burrs) 55 as shown in FIG. 9 are generated at the corresponding portions, and when the excess thickness portion between the both hole portions of the forged member 54 ′ is punched out, both protruding shaft portions are formed. A step 56 is formed at the boundary between the two hole portions formed by 51b and 52b and the punched through hole 53 portion. Therefore, after the forging process, it is necessary to separately perform the respective cutting processes for removing the band-shaped protrusion 55 on the outer diameter surface side and the step 56 of the through hole portion on the inner diameter surface side, resulting in poor productivity and cutting. There is a problem that the manufacturing cost becomes high because the processing cost is separately required.
【０００４】このような問題点を解決するものとして、
例えば特許第２８２４４１０号公報には、外径側球面形
状リングの外径面及び内径面の切削加工を不要とし、生
産性の向上と低コストで製造できる外径側球面形状リン
グの製造方法が開示されている。これは、図１０及び図
１１に示すように、最終製品としての外径側球面形状リ
ングにおける端面の直径と同じ外径を有する円筒状素材
Ｘ3 を、対称形状の半割球面成形部２１ａ，３１ａをも
つダイ２１とパンチ３１を密着させ、かつ内径側に中央
ガイドピン２３を挿入した、これらダイ２１とパンチ３
１及び中央ガイドピン２３とによる密閉状の成形空間部
内に、上記円筒状素材Ｘ3 を内在させた状態で、ダイ側
の円筒状成形体２４とパンチ側の筒状押圧体３２で上記
円筒状素材Ｘ3 の軸方向両端面を圧縮して、素材の中間
部分を上記両半割球面成形部内に膨出させて外周を球面
状に形成するもので、図１１に示す最終製品としての外
径側球面状リングＸ2 にはその外径側円周方向の帯状突
起物や内径面側の貫通孔部に段差が発生しない。As a means for solving such problems,
For example, Japanese Patent No. 2824410 discloses a method for manufacturing an outer diameter side spherical ring which does not require cutting of the outer diameter surface and the inner diameter surface of the outer diameter side spherical shape ring and can be manufactured with improved productivity and low cost. Has been done. As shown in FIGS. 10 and 11, the cylindrical material X 3 having the same outer diameter as the diameter of the end face of the outer diameter side spherical ring as the final product is formed into a symmetrical half-divided spherical molding portion 21a, The die 21 and the punch 3 having the die 31 and the punch 31 closely attached to each other and the central guide pin 23 inserted in the inner diameter side are provided.
1 and the central guide pin 23, in the state where the cylindrical material X 3 is contained in the closed molding space, the cylindrical molding body 24 on the die side and the cylindrical pressing body 32 on the punch side form the cylindrical shape. Both ends of the material X 3 in the axial direction are compressed to bulge the middle part of the material into the two half-divided spherical moldings to form a spherical outer periphery. The outer diameter as the final product shown in FIG. In the side spherical ring X 2 , no step is formed in the outer circumferential circumferential strip-shaped projection or the through hole on the inner diameter side.
【０００５】したがって、前記特許第２８２４４１０号
公報の発明では、外径面及び内径面の切削加工が不要と
なり、生産性の向上と製造コストの低減が図られるとい
った効果はあるが、一方、工具の早期破損を招来すると
いった問題点がある。すなわち、この特許発明におい
て、円筒状素材Ｘ3 の両端面の軸方向への圧縮は、ダイ
側の円筒状成形体２４とパンチ側の筒状押圧体３２によ
って行われるが、これらの工具２４，３２の素材Ｘ3 と
接触する部分近傍は厚みの非常に薄い円筒状形状とな
り、高荷重に耐えられない。然るに特に冷間鍛造では熱
間鍛造に比べて素材の変形抵抗は非常に大きくなってい
るから、前記ダイ側の円筒状成形体２４とパンチ側の筒
状押圧体３２には過大な圧力が作用し、これら工具が早
期に破損して工具交換が頻繁に必要になり生産性が悪化
し、また工具費が多く必要となるため製造コストが高く
なるといった問題があった。Therefore, in the invention of Japanese Patent No. 2824410, the outer diameter surface and the inner diameter surface are not required to be cut, and there is an effect that productivity is improved and manufacturing cost is reduced. There is a problem that it causes early damage. That is, in this patented invention, axial compression of both end surfaces of the cylindrical material X 3 is performed by the cylindrical molding body 24 on the die side and the cylindrical pressing body 32 on the punch side. The vicinity of the portion of 32 which contacts the material X 3 has a very thin cylindrical shape and cannot bear a high load. However, particularly in cold forging, the deformation resistance of the material is much higher than in hot forging, so excessive pressure acts on the die-side cylindrical compact 24 and the punch-side cylindrical pressing body 32. However, there is a problem in that these tools are damaged early and frequently need to be replaced, which deteriorates productivity, and a large tool cost is required, resulting in high manufacturing cost.
【０００６】また、前記特許第２８２４４１０号公報の
発明において、外径側球面形状リングの外径寸法と内径
寸法が近いいわゆる薄肉リングの場合、例えば特許第２
８２５８００号公報に開示されているように、図１２に
示すように、円筒状素材Ｘ1の両端面をダイ側の円筒状
成形体２４とパンチ側の筒状押圧体３２によって軸方向
に圧縮して、円筒状素材Ｘ1 の中間部分を対称形状の半
割球面成形部２１ａ，３１ａをもつダイ２１とパンチ３
１及び中央ガイドピン２３とによる密閉状の成形部内に
膨出させて、外周を球面状に成形する際、外径面側の膨
出変形に引っ張られるように内径面側も径が拡大してし
まう。そのため、外径側球面形状リングの所定の長さ寸
法に成形するため、さらに円筒状素材Ｘ1 の両端面を軸
方向に圧縮した場合に、図１３に示すように、外径側球
面形状リングＸの内径面に円周方向の引けきずＫが発生
し、健全な薄肉の外径側球面形状リングが得られないと
いった問題点があった。In the invention of Japanese Patent No. 2824410, in the case of a so-called thin-walled ring in which the outer diameter and the inner diameter of the outer diameter side spherical ring are close to each other, for example, Japanese Patent No. 2 is used.
As disclosed in Japanese Patent No. 825800, as shown in FIG. 12, both end surfaces of the cylindrical material X 1 are axially compressed by the cylindrical molding body 24 on the die side and the cylindrical pressing body 32 on the punch side. The intermediate portion of the cylindrical material X 1 and the die 21 and the punch 3 having symmetrical half-divided spherical forming portions 21a and 31a.
1 and the central guide pin 23, when expanded into a hermetically molded part to mold the outer periphery into a spherical shape, the inner diameter side also expands so as to be pulled by the bulging deformation on the outer diameter side. I will end up. Therefore, when both end surfaces of the cylindrical material X 1 are further compressed in the axial direction in order to form the outer diameter side spherical shape ring into a predetermined length dimension, as shown in FIG. 13, the outer diameter side spherical shape ring is formed. There is a problem that a circumferential flaw K occurs on the inner diameter surface of X, and a sound thin outer diameter side spherical ring cannot be obtained.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、上記のよう
な従来の問題点を解決するために成されたもので、冷間
鍛造加工によって外径側球面形状リングを製造する場合
において、成形後に内外径面の切削加工を必要とせず、
また内径面に有害なキズの発生がない外径側球面形状リ
ングを得るとゝもに、金型寿命を向上させることの出来
る鍛造方法を提供することを目的としたものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended for forming an outer diameter side spherical ring by cold forging. It does not require cutting of the inner and outer diameter surfaces later,
Another object of the present invention is to provide a forging method capable of improving the life of the die while obtaining an outer diameter side spherical ring which does not cause harmful scratches on the inner diameter surface.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、本発明は次のように構成したことを特徴とする外径
側球面形状リングの製造方法である。すなわち、請求項
１に係る発明は、外径面が球面状に膨出した外径側球面
形状リングを冷間鍛造により製造する方法であって、予
め、製品となる前記外径側球面形状リングの端面の直径
より大きく、該球面形状リングの最大外径よりも小さい
外径と、前記外径側球面形状リングの内径とほぼ等しい
内径を有する円筒状素材を形成し、次いで、該円筒状素
材の内径側に前記外径側球面形状リングの内径と等しい
径を有するインサートピンを挿入した後、前記外径側球
面形状リングの外径面及び端面の成形部を片端面側づつ
対称形状にそれぞれ有するパンチとダイで前記円筒状素
材をその両端面の外径面側から圧縮し、該円筒状素材の
外径面中央付近を膨出させて球面状に成形するとゝもに
両端面付近の外径面を絞り込んで球面状に成形し、前記
パンチ，ダイ及びインサートピンで形成される成形空間
部内への前記円筒状素材の充満が、外径面中央付近と端
面付近とで同時に完了するように成形することを特徴と
するものである。In order to achieve the above object, the present invention is a method of manufacturing an outer diameter side spherical ring having the following construction. That is, the invention according to claim 1 is a method for manufacturing an outer diameter side spherical shape ring whose outer diameter surface bulges in a spherical shape by cold forging, and the outer diameter side spherical shape ring to be a product in advance. Forming a cylindrical material having an outer diameter that is larger than the diameter of the end surface of the outer ring and smaller than the maximum outer diameter of the spherical ring, and an inner diameter that is substantially equal to the inner diameter of the outer spherical ring. After inserting an insert pin having a diameter equal to the inner diameter of the outer diameter side spherical ring on the inner diameter side of, the molding portion of the outer diameter surface and the end surface of the outer diameter side spherical ring are symmetrically shaped one by one on one end surface side respectively. By compressing the cylindrical material from the outer diameter surface side of both end surfaces with a punch and a die having, and bulging the vicinity of the center of the outer diameter surface of the cylindrical material to form a spherical shape, the outside of both end surfaces near The radial surface is narrowed down and molded into a spherical shape, Inch, filling of the cylindrical material to the molding space portion formed by the die and the insert pin, and is characterized in that shaped to complete outer surface near the center and the end face near the simultaneously.
【０００９】また、請求項２に係る発明は、外径面が球
面状に膨出した外径側球面形状リングを冷間鍛造により
製造する方法であって、予め、前工程の鍛造加工で、製
品となる前記外径側球面形状リングの端面の直径より大
きく、該球面形状リングの最大外径よりも小さい外径
と、前記外径側球面形状リングの内径とほぼ等しい内径
を有する円筒状素材を形成し、次いで、該円筒状素材の
内径側に前記外径側球面形状リングの内径と等しい径を
有するインサートピンを挿入した後、前記外径側球面形
状リングの外径面及び端面の成形部を片端面側づつ対称
形状にそれぞれ有するパンチとダイで前記円筒状素材を
その両端面の外径面側から圧縮し、該円筒状素材の外径
面中央付近を膨出させて球面状に形成するとゝもに両端
面付近の外径面を絞り込んで球面状に成形し、前記パン
チ，ダイ及びインサートピンで形成される成形空間部内
への前記円筒状素材の充満が、外径面中央付近と端面付
近とで同時に完了するように成形することを特徴とする
ものである。The invention according to claim 2 is a method for manufacturing an outer diameter side spherical ring whose outer diameter surface bulges in a spherical shape by cold forging. A cylindrical material having an outer diameter larger than the diameter of the end surface of the outer diameter side spherical ring to be a product and smaller than the maximum outer diameter of the spherical shape ring, and an inner diameter substantially equal to the inner diameter of the outer diameter side spherical shape ring. And then insert an insert pin having a diameter equal to the inner diameter of the outer diameter side spherical ring to the inner diameter side of the cylindrical material, and then molding the outer diameter surface and the end surface of the outer diameter side spherical ring. The cylindrical material is compressed from the outer diameter surface side of both end surfaces thereof with a punch and a die each having a symmetrical portion at one end surface side, and the vicinity of the center of the outer diameter surface of the cylindrical material is expanded to form a spherical shape. When formed, the outer diameter surface near both end surfaces is reduced. And forming into a spherical shape so that the filling of the cylindrical material into the forming space formed by the punch, die and insert pin is completed simultaneously near the center of the outer diameter surface and near the end surface. It is characterized by.
【００１０】[0010]
【発明の実施の形態】以下、本発明を図１乃至図６に示
す実施形態により詳細に説明するに、図１および図２は
本発明の鍛造方法における加工開始直前の状態を示した
ものであり、図中１はパンチ，２はダイである。このパ
ンチ１とダイ２のそれぞれの前面側には、該パンチ１と
ダイ２のそれぞれの前面がお互いに接したときに、製品
となる外径側球面形状リング（図６の（IV）に示すリン
グ）Ｒの外径面Ｒ1 が所定寸法の球面形状となるよう
に、片端面側づつの対称形状の半割球面成形部１ａと２
ａがそれぞれ設けられている。なお、前記パンチ１とダ
イ２のそれぞれの内径面１ｂと２ｂの直径は、前記外径
側球面形状リングＲの端面Ｒ2 の直径ａとそれぞれ同一
大きさに設定されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1 to 6. FIGS. 1 and 2 show the state immediately before the start of processing in the forging method of the present invention. Yes, 1 is a punch and 2 is a die. On the front surface side of each of the punch 1 and the die 2, when the front surfaces of the punch 1 and the die 2 are in contact with each other, a spherical ring having an outer diameter side (shown in (IV) of FIG. 6 is a product. Ring) R so that the outer diameter surface R 1 of the ring R has a spherical shape of a predetermined size, the half-divided spherical molding portions 1a and 2 having symmetrical shapes on one end surface side.
a are provided respectively. The diameters of the inner diameter surfaces 1b and 2b of the punch 1 and the die 2 are set to be the same as the diameter a of the end surface R 2 of the outer diameter side spherical ring R.
【００１１】前記パンチ１内には、前記外径側球面形状
リングＲの内径ｃと等しい外径を有するインサートピン
３が前記パンチ１と相対移動しないように設置されてお
り、さらに該パンチ１内には、パンチ１の内径面１ｂと
前記インサートピン３の外径面との間に、円筒状のパン
チ側素材けり出しスリーブ４が摺動自在に設置されてい
る。そして、該パンチ側素材けり出しスリーブ４の最後
退時には、その先端面４ａがパンチ１の前記半割球面成
形部１ａの最後部に位置して、外径側球面形状リングＲ
の外径面Ｒ1 及び端面Ｒ2 の成形部を形成する。鍛造終
了後は、パンチ側素材けり出しピン６Ａが前進すること
によって前記パンチ側素材けり出しスリーブ４が前面方
向に移動し、前記パンチ１及びインサートピン３から外
径側球面形状リングＲを分離排出する。Inside the punch 1, an insert pin 3 having an outer diameter equal to the inner diameter c of the outer diameter side spherical ring R is installed so as not to move relative to the punch 1, and further inside the punch 1. A cylindrical punch-side material ejection sleeve 4 is slidably installed between the inner diameter surface 1b of the punch 1 and the outer diameter surface of the insert pin 3. When the punch-side material protruding sleeve 4 is finally retracted, its front end surface 4a is located at the rearmost portion of the half-split spherically shaped portion 1a of the punch 1, and the outer diameter side spherical ring R
Forming portions of the outer diameter surface R 1 and the end surface R 2 are formed. After the forging is completed, the punch side material protrusion pin 6A moves forward to move the punch side material protrusion sleeve 4 in the front direction to separate and discharge the outer diameter side spherical ring R from the punch 1 and the insert pin 3. To do.
【００１２】一方、前記ダイ２内には、外径面がダイ２
の内径面２ｂに内接し、内径面が前述のインサートピン
３と嵌め合い可能な円筒状のダイ側素材けり出しスリー
ブ５が摺動自在に設置されており、このダイ側素材けり
出しスリーブ５の最後退時には、その先端面５ａがダイ
２の半割球面成形部２ａの最後部に位置して、外径側球
面形状リングＲの外径面Ｒ１および端面Ｒ２の成形部を
形成する。なお、図中６Ｂはダイ側素材けり出しピンで
ある。On the other hand, in the die 2, the outer diameter surface is the die 2
A cylindrical die-side material squeezing sleeve 5 which is inscribed in the inner diameter surface 2b of the die and is fittable with the insert pin 3 is slidably installed. At the time of the final retreat, the front end surface 5a thereof is located at the rearmost part of the half spherical surface forming portion 2a of the die 2 to form the outer diameter surface R1 and the end surface R2 of the outer diameter side spherical ring R. In addition, 6B in the drawing is a die side material protruding pin.
【００１３】ここで、前記インサートピン３の先端部は
パンチ１の前面より突出しており、この突出したインサ
ートピン３の先端部は前記パンチ１，ダイ２およびイン
サートピン３で形成される成形空間部内に設置した円筒
状素材（図６の(III）に示す素材）Ａの内径側を貫通
し、先端が前記円筒状素材Ａから幾分突き出ている。な
お、この円筒状素材Ａの内径側に挿入した前記インサー
トピン３の外径は、前記外径側球面形状リングＲの内径
ｃと等しい径を有するものである。Here, the tip of the insert pin 3 projects from the front surface of the punch 1, and the tip of the projecting insert pin 3 is inside the molding space formed by the punch 1, the die 2 and the insert pin 3. The cylindrical raw material (the raw material shown in (III) of FIG. 6) A installed on the inner surface of the cylindrical raw material A penetrates the inner diameter side, and the tip of the cylindrical raw material A protrudes somewhat. The outer diameter of the insert pin 3 inserted on the inner diameter side of the cylindrical material A is equal to the inner diameter c of the outer diameter side spherical ring R.
【００１４】また、前記円筒状素材Ａは、製品となる外
径側球面形状リングＲと同じ体積を有するものであっ
て、その外径は前記外径側球面形状リングＲの端面Ｒ2
の直径（すなわち、パンチ１またはダイ２の内径面１
ｂ，２ｂの直径）ａより大きく、また該球面形状リング
Ｒの最大外径（すなわち、外径面Ｒ1 の中央付近におけ
る最大膨出部の外径）ｂよりも小さいものである。した
がって、図１及び図２に示す加工開始直前では、前記円
筒状素材Ａはパンチ１及びダイ２の半割球面成形部１ａ
ないし２ａにおいて、前記パンチ１ないしダイ２の前面
側から半割球面成形部１ａないし２ａの最後部にかけて
の途中の位置で接することになる。Further, the cylindrical material A has the same volume as the outer diameter side spherical ring R to be a product, and the outer diameter thereof is the end surface R 2 of the outer diameter side spherical ring R.
Diameter (ie inner diameter surface 1 of punch 1 or die 2)
b, 2b) and is smaller than the maximum outer diameter b of the spherical ring R (that is, the outer diameter of the maximum bulge near the center of the outer diameter surface R 1 ) b. Therefore, immediately before the start of the processing shown in FIGS. 1 and 2, the cylindrical raw material A is the half-spherical surface forming portion 1a of the punch 1 and the die 2.
2a to 2a, the punch 1 and the die 2 come into contact with each other at a position midway from the front side of the punch 1 or the die 2 to the rearmost part of the half spherical surface forming portions 1a to 2a.
【００１５】図３は、本発明の鍛造方法における加工途
中の状態を示したものである。図１及び図２に示す状態
からダイ２に対しパンチ１が相対的に前進移動し、外径
側球面形状リングＲの外径面Ｒ1 および端面Ｒ2 の成形
部が成形される。すなわち、前記円筒状素材Ａは、片端
面側づつの対称形状の半割球面成形部１ａと２ａを有す
るパンチ１とダイ２で、その両端面付近の外側からそれ
ぞれ軸方向へ圧縮される。そのため、この円筒状素材Ａ
には、図３に示すように、その外径面中央付近Ａ1 が膨
出されて外径が拡大する変形と、両端面付近Ａ2 ，Ａ2
の外径が絞り込まれて、円筒状素材Ａの両端面がパンチ
１やダイ２の半割球面成形部１ａ，２ａの最後部側（す
なわち、パンチ側及びダイ側素材けり出しスリーブ４，
５の先端面４ａ，５ａへ向かう側）へそれぞれ移動する
変形とが同時に起こる。FIG. 3 shows a state during processing in the forging method of the present invention. From the state shown in FIG. 1 and FIG. 2, the punch 1 moves forward relative to the die 2, and the outer diameter surface R 1 and the end surface R 2 of the outer diameter side spherical ring R are molded. That is, the cylindrical material A is axially compressed from the outside near both end surfaces thereof by the punch 1 and the die 2 each having the symmetrical half-divided spherical molding portions 1a and 2a on one end surface side. Therefore, this cylindrical material A
The, as shown in FIG. 3, the deformation outside diameter is enlarged its outer diameter surface central area A 1 is bulged, both end surfaces near the A 2, A 2
The outer diameter of the cylindrical material A is narrowed down so that both end surfaces of the cylindrical material A are located at the rearmost side of the half-spherical surface molding portions 1a, 2a of the punch 1 and the die 2 (that is, punch side and die side material protruding sleeves 4,
At the same time, the deformation of moving to the tip surfaces 4a and 5a of 5) occurs.
【００１６】図４及び図５は本発明の鍛造方法における
加工末期及び加工完了時の状態をそれぞれ示したもので
ある。ここで、パンチ１，ダイ２及びインサートピン３
で形成される成形空間部内への前記円筒状素材Ａの充満
が、該円筒状素材Ａの外径面中央付近Ａ1 と両端面付近
Ａ2 ，Ａ2 とでそれぞれ同時に完了し、図６の（IV）に
示す外径側球面形状リングＲが成形される。これによっ
て、円筒状素材Ａの外径面を球面形状に成形する際に、
円筒状素材Ａのパンチ１とダイ２との合わせ面に対応す
る部分に円周方向の帯状突起物（ばり）が発生すること
はない。FIG. 4 and FIG. 5 show the states at the end of processing and at the completion of processing in the forging method of the present invention, respectively. Here, punch 1, die 2 and insert pin 3
The filling of the cylindrical material A into the molding space formed in step 1 is completed simultaneously near the center A 1 of the outer peripheral surface of the cylindrical material A and near the end surfaces A 2 and A 2 , respectively. The outer diameter side spherical ring R shown in (IV) is molded. As a result, when the outer diameter surface of the cylindrical material A is formed into a spherical shape,
A circumferential band-shaped protrusion (burr) does not occur at the portion of the cylindrical material A corresponding to the mating surface between the punch 1 and the die 2.
【００１７】また、前記図２に示す加工初期から図４に
示す加工末期にわたる加工過程の大部分において、円筒
状素材Ａの両端面付近Ａ2 ，Ａ2 の軸方向への圧縮は、
パンチ１およびダイ２の半割球面成形部１ａと２ａによ
ってそれぞれ行われ、厚みの薄い円筒形状物であるパン
チ側ないしダイ側素材けり出しスリーブ４，５の先端面
４ａと５ａは、図４に示すように、円筒状素材Ａの端面
部によって加工末期にのみ押圧される。またこの時、パ
ンチ及びダイの成形部１ａ，２ａも加工荷重を分担して
受けているから、パンチ側ないしダイ側素材けり出しス
リーブ４，５が薄い円筒状形状であっても、また素材の
変形抵抗が高い冷間鍛造であっても、それら素材けり出
しスリーブ４，５が早期に破損することはない。Further, in most of the machining process from the initial stage of machining shown in FIG. 2 to the final stage of machining shown in FIG. 4, the axial compression of the cylindrical material A near both end surfaces A 2 , A 2 is
The tip surfaces 4a and 5a of the punch-side or die-side material ejection sleeves 4 and 5 which are thin cylindrical products and which are respectively performed by the half spherical surface forming portions 1a and 2a of the punch 1 and the die 2 are shown in FIG. As shown, the end face of the cylindrical material A is pressed only at the final stage of processing. Further, at this time, since the punching and die forming portions 1a and 2a also share and receive the processing load, even if the punch-side or die-side material protruding sleeves 4 and 5 have a thin cylindrical shape, Even in cold forging with high deformation resistance, the material-extruding sleeves 4 and 5 are not damaged early.
【００１８】そしてまた、加工中、前記円筒状素材Ａは
パンチ１及びダイ２の半割球面成形部１ａと２ａによっ
て両端面の外径面側から絶えず押圧されており、円筒状
素材Ａには外径面側から内径面側へ向かう圧力が作用し
ている。このため、円筒状素材Ａの内径面側は径の拡大
が起こりにくくなっている。また、円筒状素材Ａの内径
面側はインサートピン３に押圧されるので、外径側球面
形状リングＲにはこのインサートピン３と同じ径の内径
面が正確に形成される。Further, during the processing, the cylindrical material A is constantly pressed by the halved spherical surface forming portions 1a and 2a of the punch 1 and the die 2 from the outer diameter surface side of both end surfaces. The pressure acting from the outer diameter surface side to the inner diameter surface side acts. Therefore, the inner diameter side of the cylindrical material A is less likely to expand in diameter. Further, since the inner diameter side of the cylindrical material A is pressed by the insert pin 3, the outer diameter side spherical ring R is accurately formed with the inner diameter surface having the same diameter as the insert pin 3.
【００１９】なお、上記の実施形態では、パンチ及びダ
イのそれぞれの構成部品を、パンチ側はパンチ１と素材
けり出しスリーブ４とに分割し、またダイ側はダイ２と
素材けり出しスリーブ５とに分割して、夫々の素材けり
出しスリーブ４，５を摺動自在に設置し、成形後の外径
側球面形状リングＲを素材けり出しスリーブ４，５によ
ってパンチ１及びインサートピン３もしくはダイ２から
分離排出するようにしたが、成型後の外径側球面形状リ
ングＲをパンチ１もしくはダイ２から分離排出するよう
にした他の方法で行ってもよい。In the above embodiment, each component of the punch and the die is divided into the punch 1 and the material ejection sleeve 4 on the punch side, and the die 2 and the material ejection sleeve 5 on the die side. Each of the material ejection sleeves 4 and 5 is slidably installed, and the outer diameter side spherical ring R after molding is punched by the material ejection sleeves 4 and 5 and the punch 1 and the insert pin 3 or the die 2 are formed. However, it may be separated and discharged from the punch 1 or the die 2 by another method.
【００２０】例えば、インサートピン３をパンチ１と摺
動自在に設置して、成形後にインサートピン３を一旦前
進させて外径側球面形状リングＲをパンチ前方へ突き出
した後、パンチ前面と外径球面リングＲとの間にストッ
パー（図示ぜず）を挿入し、次いでインサートピン３を
後退させてストッパーにより外径側球面形状リングＲか
らインサートピン３を引き抜く方法等を用いれば、パン
チ側ではパンチ１と素材けり出しスリーブ４とを一体化
し、またダイ側ではダイ２と素材けり出しスリーブ５と
を一体化する構造としてもよい。For example, the insert pin 3 is slidably installed on the punch 1, and after the molding, the insert pin 3 is temporarily advanced to project the outer diameter side spherical ring R to the front of the punch, and then the punch front surface and the outer diameter. If a stopper (not shown) is inserted between the spherical ring R and the insert pin 3, then the insert pin 3 is retracted and the insert pin 3 is pulled out from the spherical ring R on the outer diameter side by the stopper. 1 may be integrated with the material ejection sleeve 4, and the die 2 may be integrated with the material ejection sleeve 5 on the die side.
【００２１】また一方、上記実施形態では、パンチ１と
ダイ２のそれぞれの前面側には、パンチ１とダイ２のそ
れぞれの前面がお互いに接したときに、製品となる外径
側球面形状リングＲの外径面Ｒ1 が所定寸法を有する球
面形状となるように、片端面側づつの対称形状の半割球
面成形部１ａと２ａが設けられている例を示したが、図
７に示すように、パンチ１’とダイ２’のそれぞれの前
面が僅かの隙間Ｓを介して近接したときに、製品となる
外径側球面形状リングＲの外径面Ｒ1 が所定寸法を有す
る球面形状となるように、片端面側づつの対称形状の概
略半割球面成形部１ａ’と２ａ’を設けるようにしても
よい。On the other hand, in the above embodiment, on the front side of each of the punch 1 and the die 2, when the front sides of the punch 1 and the die 2 are in contact with each other, the outer diameter side spherical ring is formed. An example has been shown in which the halved spherical surface forming portions 1a and 2a having symmetrical shapes are provided on one end surface side so that the outer diameter surface R 1 of R has a spherical shape having a predetermined dimension. As described above, when the front surfaces of the punch 1 ′ and the die 2 ′ come close to each other with a slight gap S, the outer diameter surface R 1 of the outer diameter side spherical shape ring R to be a product has a spherical shape having a predetermined dimension. Therefore, the substantially half-divided spherical molding portions 1a ′ and 2a ′ having a symmetrical shape may be provided on one end surface side.
【００２２】すなわち、パンチ１’，ダイ２’及びイン
サートピン３’で形成される概略成形空間部内への円筒
状素材Ａの充満が、外径面中央付近Ａ1 と両端面付近Ａ
2 ，Ａ2 とで同時に完了することによって、円筒状素材
Ａの外径面を球面形状に成形する際に、前記パンチ１’
とダイ２’との隙間Ｓに円筒状素材Ａが大きく押し出さ
れることは無い。従って、外径側球面形状リングＲのパ
ンチ１’とダイ２’との合わせ面に対応する部分に、後
加工に有害な円周方向の帯状突起物（ばり）が発生する
ことはない。That is, the filling of the cylindrical material A into the general molding space formed by the punch 1 ', the die 2'and the insert pin 3'is such that the outer diameter surface is near the center A 1 and both end surfaces are near A.
By simultaneously completed in the 2, A 2, when forming the outer diameter surface of the cylindrical material A in spherical shape, the punch 1 '
The cylindrical material A is not largely extruded into the gap S between the die and the die 2 '. Therefore, in the portion corresponding to the mating surface of the punch 1'and the die 2'of the outer diameter side spherical ring R, a circumferential band-shaped protrusion (burr) harmful to the post-processing does not occur.
【００２３】[0023]
【実施例】つぎに、本発明の実施例と比較例を述べる
と、軸受鋼（ＳＵＪ２）の線材からせん断で鍛造用素材
を切出し、外径面の最大外径（球面直径）約２１．１ｍ
ｍ，端面の直径約１６．８ｍｍ，内径約１３．９ｍｍ，
長さ約１２．７ｍｍの外径側球面形状リングを本発明の
製造方法で作製した。EXAMPLES Next, examples of the present invention and comparative examples will be described. A forging material was cut out from a bearing steel (SUJ2) wire rod by shearing, and the maximum outer diameter (spherical diameter) of the outer diameter surface was about 21.1 m.
m, the diameter of the end face is about 16.8 mm, the inner diameter is about 13.9 mm,
An outer diameter spherical ring having a length of about 12.7 mm was produced by the manufacturing method of the present invention.
【００２４】図６は本発明の鍛造工程を示したのもで、
（Ｉ）は据込み工程、（II）は押出し工程、(III）は内
径側余肉部の打抜き工程、（IV）は外径側球面形状リン
グの成形工程であり、本実施例では、該成形工程（IV）
で成形される外径側球面形状リングＲの素材、すなわ
ち、前記 (III)に示す円筒状素材Ａを、上記据込み工程
（Ｉ）から打抜き工程 (III)の鍛造工程で形成し、次い
で成形工程（IV）で外径側球面形状リングＲを成形する
ように、多段パーツホーマにて一連の鍛造加工により製
造した。FIG. 6 shows the forging process of the present invention.
(I) is an upsetting step, (II) is an extruding step, (III) is a step of punching the inner diameter side excess thickness portion, and (IV) is a step of molding an outer diameter side spherical ring. Molding process (IV)
The material of the outer diameter side spherical ring R molded in step 1, that is, the cylindrical material A shown in (III) above is formed in the forging step from the upsetting step (I) to the punching step (III), and then formed. It was manufactured by a series of forging processes in a multi-stage part homer so that the outer diameter side spherical ring R was formed in the step (IV).
【００２５】ここで、前記打抜き工程 (III)で形成され
た円筒状素材Ａの外径は２０．６ｍｍで、外径側球面形
状リングＲの最大外径に対し９８％である。また円筒状
素材Ａの内径は、前記成形工程（IV）でインサートピン
３が無理なく挿入されるように、インサートピン３の外
径より僅かに大きくなっており、円筒状素材Ａの長さ
は、その体積が製品となる外径側球面形状リングＲと同
じ体積となるように調整しており、本実施例では約１
０．８ｍｍである。Here, the outer diameter of the cylindrical material A formed in the punching step (III) is 20.6 mm, which is 98% of the maximum outer diameter of the outer diameter side spherical ring R. Further, the inner diameter of the cylindrical material A is slightly larger than the outer diameter of the insert pin 3 so that the insert pin 3 can be inserted smoothly in the molding step (IV), and the length of the cylindrical material A is The volume is adjusted to be the same as that of the outer diameter side spherical ring R which is a product.
It is 0.8 mm.
【００２６】上記成形工程（IV）において、その前工程
(III)で成形した上記円筒状素材Ａに外径側球面成形加
工を行うことにより、パンチ，ダイおよびインサートピ
ンで形成される成形空間部内への円筒状素材Ａの充満
が、外径面中央付近Ａ1 と両端面付近Ａ2 ，Ａ2 とで同
時に完了する。したがって、円筒状素材Ａの外径面を球
面形状に成形する際の、素材のパンチとダイとの合わせ
面に対応する部分での円周方向の帯状突起物（ばり）が
発生することはなく、また内径面に円周方向の引けきず
の発生もない、健全な薄肉の外径側球面形状リングＲを
製造することができた。さらに、上記成形工程（IV）の
パンチ側ないしダイ側素材けり出しスリーブは厚みが約
１．５ｍｍの非常に薄い円筒形状であるにもかかわら
ず、量産鍛造でも何ら破損は発生しなかった。In the above molding step (IV), the previous step
By performing spherical molding on the outer diameter side of the cylindrical material A molded in (III), the filling of the cylindrical material A into the molding space formed by the punch, die and insert pin can be performed at the center of the outer diameter surface. Completion at the same time in the vicinity A 1 and both end surfaces A 2 , A 2 . Therefore, when the outer diameter surface of the cylindrical material A is formed into a spherical shape, a circumferential band-shaped projection (flash) does not occur at the portion corresponding to the mating surface of the punch and die of the material. In addition, it was possible to manufacture a sound thin ring-shaped spherical surface R on the outer diameter side, which was free from the occurrence of circumferential scratches on the inner diameter surface. Further, although the punch-out or die-side material protruding sleeve in the forming step (IV) had a very thin cylindrical shape with a thickness of about 1.5 mm, no damage occurred even in mass production forging.
【００２７】また、本実施例の外径側球面形状リングに
対しては、内径側余肉部の打抜き工程 (III)で形成され
る円筒状素材Ａの外径を、外径側球面形状リングＲの最
大外径に対し９５〜９９％の範囲内とすることで健全な
薄肉の外径側球面形状リングを製造することができた。
これに対し、円筒状素材Ａの外径をさらに大きくした場
合、成形空間部内への円筒状素材Ａの充満過程で、加工
途中で外径面中央付近Ａ1 が既に充満完了してしまい、
パンチとダイとの合わせ面に対応する部分で素材に円周
方向の帯状突起物（ばり）が発生し、また、外径側球面
形状リングＲの端面部に欠肉が発生した。For the outer diameter side spherical ring of this embodiment, the outer diameter of the cylindrical material A formed in the punching step (III) of the inner diameter side excess thickness portion is changed to the outer diameter side spherical shape ring. By setting the ratio within the range of 95 to 99% with respect to the maximum outer diameter of R, it was possible to manufacture a sound thin outer diameter side spherical shape ring.
On the other hand, when the outer diameter of the cylindrical material A is further increased, during the process of filling the cylindrical material A into the molding space, the area A 1 near the center of the outer diameter surface is already filled,
Circumferential band-shaped projections (flashes) were generated on the material at the portion corresponding to the mating surface of the punch and die, and a flesh was formed on the end surface portion of the outer diameter side spherical ring R.
【００２８】一方、円筒状素材Ａの外径を上記範囲より
小さくした場合には、外径面中央付近Ａ1 の充満よりも
端面付近Ａ2 の充満の方が速く、外径側球面形状リング
Ｒの内径面中央部に円周方向の引けきずが発生し、また
円筒状素材Ａの外径をさらに小さくした場合には、前記
成形工程（IV）のパンチ側とダイ側双方の素材けり出し
スリーブが早期に破損した。On the other hand, when the outer diameter of the cylindrical material A is smaller than the above range, the filling of the end face A 2 is faster than the filling of the center A 1 of the outer diameter surface, and the outer diameter side spherical ring. In the case where a circumferential flaw is generated in the central portion of the inner diameter surface of R and the outer diameter of the cylindrical material A is further reduced, the material protruding on both the punch side and the die side of the forming step (IV) is performed. The sleeve was damaged early.
【００２９】上記のように、本実施例の外径側球面形状
リングに対しては、前記打抜き工程（III)で形成される
円筒状素材Ａの外径を、外径側球面形状リングＲの最大
外径に対し９５〜９９％の範囲内とすることで健全な薄
肉の外径側球面形状リングを製造することができたが、
該円筒状素材Ａの外径範囲は製品となる外径側球面形状
リングＲの内外径の比や長さによって異なってくる。本
発明では、該円筒状素材の外径を有限要素法による素材
の塑性変形シミュレーションによって求める。As described above, for the outer diameter side spherical ring of this embodiment, the outer diameter of the cylindrical material A formed in the punching step (III) is the same as that of the outer diameter side spherical ring R. By setting the ratio within the range of 95 to 99% with respect to the maximum outer diameter, it was possible to manufacture a sound thin outer diameter side spherical shape ring.
The outer diameter range of the cylindrical material A varies depending on the ratio of the inner and outer diameters of the outer diameter side spherical ring R as a product and the length. In the present invention, the outer diameter of the cylindrical material is obtained by a plastic deformation simulation of the material by the finite element method.
【００３０】すなわち、種々の外径寸法を有するそれぞ
れの円筒状素材に対し本発明の鍛造方法について、計算
機上であたかも実際の鍛造加工を行うかのようにシミュ
レーションし、得られた鍛造形状の計算結果から最適な
円筒状素材の外径を選択するものである。本実施例につ
いて、実際に有限要素法による素材の塑性変形シミュレ
ーションを行ったところ、外径側球面形状リングＲの最
大外径に対する円筒状素材Ａの外径は９８％が良いとい
う合理的な結果が得られた。That is, the forging method of the present invention is simulated for each cylindrical material having various outer diameter dimensions on a computer as if the actual forging process were performed, and the obtained forged shape was calculated. The optimum outer diameter of the cylindrical material is selected from the results. A plastic deformation simulation of the material by the finite element method was actually carried out for this embodiment, and a reasonable result that the outer diameter of the cylindrical material A with respect to the maximum outer diameter of the outer diameter side spherical ring R is 98% is good. was gotten.
【００３１】本実施例では、外径側球面形状リングＲに
成形される円筒状素材Ａを前記工程（Ｉ）から (III)の
鍛造工程で形成し、次いで、成形工程（IV）で外径側球
面形状リングを成形するように、多段パーツホーマにて
一連の鍛造加工により製造したが、本発明では、外径側
球面形状リングに成形される円筒状素材を別の方法で形
成し、成形工程（IV）の鍛造方法のみを独立した鍛造機
で実施するなど種々の変形が可能である。In this embodiment, the cylindrical raw material A to be formed into the spherical ring R on the outer diameter side is formed by the forging step of the steps (I) to (III), and then the outer diameter is formed in the forming step (IV). Although it was manufactured by a series of forging processes with a multi-stage part homer so as to mold the side spherical ring, in the present invention, the cylindrical material to be molded into the outer diameter side spherical ring is formed by another method, and the molding step Various modifications are possible, such as performing only the forging method of (IV) with an independent forging machine.
【００３２】[0032]
【発明の効果】本発明に係る外径側球面形状リングの製
造方法は、上記のように、外径側球面形状リングの外径
面および端面の成形部を片端面づつ対称形状にそれぞれ
有するパンチとダイで、円筒状素材の両端面の外径面か
ら圧縮し該円筒状素材の外径面中央付近を膨出させて球
面状に形成するとゝもに、端面付近の外径を絞り込んで
球面状に形成し、パンチ，ダイおよびインサートピンで
形成される成形空間部内への円筒状素材の充満が、外径
面中央付近と端面付近とで同時に完了するように成形し
たから、円筒状素材の外径面を球面形状に成形する際
に、素材のパンチとダイとの合わせ面に対応する部分
に、円周方向の帯状の突起物（ばり）が発生することは
ない。また、円筒状素材の内径面側はインサートピンに
押圧され所定の内径面が正確に形成されるので、鍛造の
ままで高精度な外径側球面形状リングを製造でき、後加
工の外径面及び内径面の切削加工が不要となり、生産性
が向上しかつ低コストで外径側球面形状リングを製造す
ることができる。As described above, the manufacturing method of the outer diameter side spherical ring according to the present invention is a punch having the outer diameter surface and the end surface of the outer diameter side spherical ring formed symmetrically with respect to each one end surface. With a die, the outer diameter surface of both ends of the cylindrical material is compressed to bulge out near the center of the outer diameter surface of the cylindrical material to form a spherical shape. Since the cylindrical material is formed into a circular shape, and the filling of the cylindrical material into the molding space formed by the punch, die, and insert pin is completed simultaneously near the center of the outer diameter surface and near the end surface, When the outer diameter surface is formed into a spherical shape, a circumferential band-shaped protrusion (flash) does not occur at the portion corresponding to the mating surface of the punch and die of the material. Also, since the inner diameter side of the cylindrical material is pressed by the insert pin to form the predetermined inner diameter surface accurately, it is possible to manufacture a highly accurate outer diameter side spherical ring as it is forged, and the outer diameter surface of the post processing Also, the machining of the inner diameter surface is not required, the productivity is improved, and the outer diameter side spherical ring can be manufactured at low cost.
【００３３】また本発明では、円筒状素材の外径は、製
品となる外径側球面形状リングの端面の直径より大き
く、また該球面形状リングの最大外径よりも小さいか
ら、加工初期から加工末期にわたる加工過程の大部分に
おいて、円筒状素材の両端面の外径面側から軸方向への
圧縮はパンチ及びダイの半割球面成形部によって行わ
れ、厚みの薄い円筒形状であるパンチ側ないしダイ側素
材けり出しスリーブの先端面は円筒状素材の端面部によ
って加工末期にのみ押圧される。またこの時、パンチ及
びダイの半割球面成形部が加工荷重を分担して受けてい
るから、素材けり出しスリーブが薄い円筒状形状であっ
ても、また素材の変形抵抗が高い冷間鍛造であっても、
これら素材けり出しスリーブが早期に破損することはな
く、かかる工具費を最小限に抑えることができ、また工
具交換の頻度が少なく生産が安定して、製造コストを低
く抑えることができる。Further, in the present invention, the outer diameter of the cylindrical material is larger than the diameter of the end surface of the outer diameter side spherical ring to be the product and smaller than the maximum outer diameter of the spherical ring, so that it is machined from the initial stage of machining. In most of the machining process in the final stage, compression from the outer diameter side of both end faces of the cylindrical material to the axial direction is performed by the half-spherical surface forming part of the punch and die, and the punch side having a thin cylindrical shape or The tip surface of the die-side material protruding sleeve is pressed only by the end surface portion of the cylindrical material at the end of processing. Also, at this time, since the half-spherical surface forming part of the punch and the die share and receive the processing load, even if the material protruding sleeve has a thin cylindrical shape, it can be cold forged with high deformation resistance of the material. Even so,
These material-extruding sleeves are not damaged at an early stage, the tool cost can be minimized, the frequency of tool replacement is low, the production is stable, and the manufacturing cost can be kept low.
【００３４】そしてまた、加工中、円筒状素材はパンチ
及びダイの半割球面成形部によって両端面の外径面側か
ら絶えず押圧されて、円筒状素材には外径面側から内径
面側へ向かう圧力が作用しており、円筒状素材の内径面
側は径の拡大が起こりにくくなっている。したがって、
外径側球面形状リングの外径寸法と内径寸法が近いいわ
ゆる薄肉リングの場合でも、円筒状素材の中間部分をパ
ンチ及びダイの両半割球面成形部内に膨出させて外周を
球面状に成形する際、外径面側の膨出変形に引っ張られ
て内径面側の径が拡大することはなく、加工後に外径側
球面形状リングの内径面に円周方向の引けきずが発生す
ることはなく、健全な薄肉の外径側球面形状リングを製
造することができる、といった諸効果がある。Further, during processing, the cylindrical material is constantly pressed by the half-spherical surface forming portions of the punch and the die from the outer diameter side of both end surfaces, and the cylindrical material is moved from the outer diameter side to the inner diameter side. Due to the acting pressure, the expansion of the diameter does not easily occur on the inner diameter side of the cylindrical material. Therefore,
Even in the case of so-called thin-walled rings where the outer diameter and inner diameter of the outer diameter side spherical shape ring are close, the middle part of the cylindrical material is bulged into both half spherical surface forming parts of the punch and die and the outer periphery is formed into a spherical shape. In this case, the bulging deformation on the outer diameter surface side does not cause the diameter on the inner diameter surface side to expand, and after machining, there is no possibility that a circumferential flaw will occur on the inner diameter surface of the outer diameter side spherical ring. In other words, it is possible to manufacture a sound thin outer diameter side spherical shape ring.
【図１】本発明の鍛造方法における加工開始直前の状態
を示す全体図である。FIG. 1 is an overall view showing a state immediately before the start of processing in a forging method of the present invention.
【図２】図１の拡大部分図である。FIG. 2 is an enlarged partial view of FIG.
【図３】本発明の鍛造方法における加工途中の状態を示
す拡大部分図である。FIG. 3 is an enlarged partial view showing a state during processing in the forging method of the present invention.
【図４】同加工末期の状態を示す拡大部分図である。FIG. 4 is an enlarged partial view showing a state at the final stage of the processing.
【図５】同加工完了時の状態を示す拡大部分図である。FIG. 5 is an enlarged partial view showing a state when the processing is completed.
【図６】本発明の鍛造工程を示す図である。FIG. 6 is a diagram showing a forging process of the present invention.
【図７】本発明の他の鍛造方法における加工完了時の状
態を示す拡大部分図である。FIG. 7 is an enlarged partial view showing a state at the time of completion of processing in another forging method of the present invention.
【図８】従来の鍛造方法における加工完了時の状態を示
す全体図である。FIG. 8 is an overall view showing a state when processing is completed in a conventional forging method.
【図９】同上方法で製造した製品の断面図である。FIG. 9 is a sectional view of a product manufactured by the same method.
【図１０】従来の鍛造方法における加工開始直前の状態
を示す全体図である。FIG. 10 is an overall view showing a state immediately before the start of processing in a conventional forging method.
【図１１】同上加工完了時の状態を示す全体図である。FIG. 11 is an overall view showing a state at the time of completion of the same as above.
【図１２】従来の鍛造方法における加工途中の状態を示
す拡大部分図である。FIG. 12 is an enlarged partial view showing a state during processing in the conventional forging method.
【図１３】同上加工完了時の状態を示す拡大部分図であ
る。FIG. 13 is an enlarged partial view showing a state at the time of completion of the same as above.
１ パンチ １ａ 半割球面成形部 １ｂ 内径面 ２ ダイ ２ａ 半割球面成形部 ２ｂ 内径面 ３ インサートピン ４ パンチ側素材けり出しスリーブ ４ａ 先端面 ５ ダイ側素材けり出しスリーブ ５ａ 先端面 Ａ 円筒状素材 Ａ1 外径面中央付近 Ａ2 端面付近 Ｒ 外径側球面形状リング Ｒ1 外径面 Ｒ2 端面 ａ 端面の直径 ｂ 最大膨出部の外径 ｃ 内径1 Punch 1a Half Split Spherical Molding Part 1b Inner Diameter Surface 2 Die 2a Half Split Spherical Molding Part 2b Inner Diameter Surface 3 Insert Pin 4 Punch Side Material Extrusion Sleeve 4a Tip Surface 5 Die Side Material Extrusion Sleeve 5a Tip Surface A Cylindrical Material A 1 Near the center of the outer diameter surface A 2 Near the end surface R Outer diameter side spherical shape ring R 1 Outer diameter surface R 2 End surface a End surface diameter b Maximum bulge outer diameter c Inner diameter
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡本 寛 富山県新湊市八幡町３丁目10番15号 日 本高周波鋼業株式会社富山製造所内 (72)発明者 古澤 貞良 富山県新湊市八幡町３丁目10番15号 日 本高周波鋼業株式会社富山製造所内 (72)発明者 中田 光昭 富山県高岡市石丸708番地の16 エヌケ イ精圧株式会社内 (72)発明者 山本 匡躬 富山県高岡市石丸708番地の16 エヌケ イ精圧株式会社内 (56)参考文献 特開 昭61−279332（ＪＰ，Ａ) 特開 平９−29382（ＪＰ，Ａ) 特開 昭49−43866（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21J 1/00 - 13/14 B21J 17/00 - 19/04 B21K 1/00 - 31/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Okamoto 3-10-15, Hachiman-cho, Shinminato-shi, Toyama Prefecture Nihon High-frequency Steel Co., Ltd. Toyama Plant (72) Inventor Teiyoshi Furusawa 3 Yawata-cho, Shinminato-shi, Toyama Prefecture Chome No. 10-15 Nihon High Frequency Steel Co., Ltd.Toyama Works (72) Inventor Mitsuaki Nakata 16 Enkey Seisaku Co., Ltd. at 708 Ishimaru, Takaoka City, Toyama Prefecture (72) Inventor Masamoto Yamamoto Takaoka City, Toyama Prefecture 16 NK Precision Co., Ltd. at 708 Ishimaru (56) Reference JP 61-279332 (JP, A) JP 9-29382 (JP, A) JP 49-43866 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B21J 1/00-13/14 B21J 17/00-19/04 B21K 1/00-31/00
Claims (2)
状リングを冷間鍛造により製造する方法であって、予
め、製品となる前記外径側球面形状リングの端面の直径
より大きく、該球面形状リングの最大外径よりも小さい
外径と、前記外径側球面形状リングの内径とほぼ等しい
内径を有する円筒状素材を形成し、次いで、該円筒状素
材の内径側に前記外径側球面形状リングの内径と等しい
径を有するインサートピンを挿入した後、前記外径側球
面形状リングの外径面及び端面の成形部を片端面側づつ
対称形状にそれぞれ有するパンチとダイで前記円筒状素
材をその両端面の外径面側から圧縮し、該円筒状素材の
外径面中央付近を膨出させて球面状に成形するとゝもに
両端面付近の外径面を絞り込んで球面状に成形し、前記
パンチ，ダイ及びインサートピンで形成される成形空間
部内への前記円筒状素材の充満が、外径面中央付近と端
面付近とで同時に完了するように成形することを特徴と
する外径側球面形状リングの製造方法。1. A method for manufacturing an outer diameter side spherical ring whose outer diameter surface bulges into a spherical shape by cold forging, wherein the diameter of the end surface of the outer diameter side spherical ring to be a product is calculated in advance. A cylindrical material having a large outer diameter smaller than the maximum outer diameter of the spherical ring and an inner diameter substantially equal to the inner diameter of the outer diameter side spherical ring is formed, and then the cylindrical material is formed on the inner diameter side of the cylindrical material. After inserting an insert pin having a diameter equal to the inner diameter of the outer diameter side spherical ring, a punch and a die each having the outer diameter surface of the outer diameter side spherical shape ring and the molding portion of the end surface are symmetrically formed on one end surface side respectively. When the cylindrical material is compressed from the outer diameter surface side of both end surfaces, and the central portion of the outer diameter surface of the cylindrical material is bulged to form a spherical shape, the outer diameter surface near both end surfaces is narrowed down. It is formed into a spherical shape, and the punch, die and in A method for manufacturing an outer diameter side spherical ring, characterized in that the molding is performed so that the filling of the cylindrical material into the molding space formed by the sart pin is completed at the center of the outer diameter surface and at the end surface at the same time.
状リングを冷間鍛造により製造する方法であって、予
め、前工程の鍛造加工で、製品となる前記外径側球面形
状リングの端面の直径より大きく、該球面形状リングの
最大外径よりも小さい外径と、前記外径側球面形状リン
グの内径とほぼ等しい内径を有する円筒状素材を形成
し、次いで、該円筒状素材の内径側に前記外径側球面形
状リングの内径と等しい径を有するインサートピンを挿
入した後、前記外径側球面形状リングの外径面及び端面
の成形部を片端面側づつ対称形状にそれぞれ有するパン
チとダイで前記円筒状素材をその両端面の外径面側から
圧縮し、該円筒状素材の外径面中央付近を膨出させて球
面状に形成するとゝもに両端面付近の外径面を絞り込ん
で球面状に成形し、前記パンチ，ダイ及びインサートピ
ンで形成される成形空間部内への前記円筒状素材の充満
が、外径面中央付近と端面付近とで同時に完了するよう
に成形することを特徴とする外径側球面形状リングの製
造方法。2. A method for manufacturing an outer diameter side spherical ring whose outer diameter surface bulges in a spherical shape by cold forging, wherein the outer diameter side spherical surface to be a product by a forging process in a previous step in advance. A cylindrical material having an outer diameter larger than the diameter of the end surface of the shaped ring and smaller than the maximum outer diameter of the spherical shaped ring and an inner diameter substantially equal to the inner diameter of the outer diameter side spherical shaped ring is formed, and then the cylindrical material is formed. After inserting an insert pin having the same diameter as the inner diameter of the outer diameter side spherical ring on the inner diameter side of the cylindrical material, the outer diameter surface and the end surface of the outer diameter side spherical ring are shaped symmetrically on one end surface side at a time. When the cylindrical material is compressed from the outer diameter surface side of both end surfaces by a punch and a die respectively provided in the above, and the central portion of the outer diameter surface of the cylindrical material is bulged to form a spherical shape, both end surfaces are also near The outer diameter surface of the An outer diameter side spherical shape characterized in that molding is performed so that the filling of the cylindrical material into the molding space formed by the punch, the die and the insert pin is completed at the center of the outer diameter surface and at the end surface at the same time. Ring manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24697699A JP3418362B2 (en) | 1999-09-01 | 1999-09-01 | Manufacturing method of outer spherical ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24697699A JP3418362B2 (en) | 1999-09-01 | 1999-09-01 | Manufacturing method of outer spherical ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001071091A JP2001071091A (en) | 2001-03-21 |
| JP3418362B2 true JP3418362B2 (en) | 2003-06-23 |
Family
ID=17156530
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24697699A Expired - Fee Related JP3418362B2 (en) | 1999-09-01 | 1999-09-01 | Manufacturing method of outer spherical ring |
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| Country | Link |
|---|---|
| JP (1) | JP3418362B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2648916C1 (en) * | 2017-03-01 | 2018-03-28 | Акционерное общество "Алексинский завод тяжёлой промышленной арматуры" (АО "Тяжпромарматура") | Method and stamp for ball valves large-sized cuttings manufacturing |
| CN111203503B (en) * | 2020-03-09 | 2021-06-18 | 中北大学 | Continuous upsetting blank making method for large-size large-height-diameter-ratio magnesium alloy cast rod |
| CN111203508B (en) * | 2020-03-09 | 2021-06-15 | 中北大学 | Continuous upsetting blank making die for magnesium alloy cast rod |
-
1999
- 1999-09-01 JP JP24697699A patent/JP3418362B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001071091A (en) | 2001-03-21 |
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