JP3407148B2 - Cold forging method of spline shaft - Google Patents
Cold forging method of spline shaftInfo
- Publication number
- JP3407148B2 JP3407148B2 JP34742093A JP34742093A JP3407148B2 JP 3407148 B2 JP3407148 B2 JP 3407148B2 JP 34742093 A JP34742093 A JP 34742093A JP 34742093 A JP34742093 A JP 34742093A JP 3407148 B2 JP3407148 B2 JP 3407148B2
- Authority
- JP
- Japan
- Prior art keywords
- spline
- cold forging
- diameter portion
- center
- spline shaft
- 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 - Lifetime
Links
Landscapes
- Forging (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、自動車のミッション部
品等に広く使用されるスプラインシャフトを冷間鍛造に
より成形する鍛造方法に関する。
【０００２】
【従来の技術】現在、自動車のミッション部品等に広く
使用されるスプラインシャフトを製造する方法として、
材料の節約及び加工工程の減少化を目的として冷間鍛造
が広く適用されるようになった。
【０００３】そこで、図１に示す如き軸方向略中央にギ
アを有する歯形部１０２を備え、歯形部１０２の軸方向
一端端部に第１スプライン１０５を有する第１小径部１
０３、他端端部に第２スプライン１０６を有する第２小
径部１０４を備えた完成スプラインシャフト１１０にお
いては、図５に示す如く、スプライン１０５，１０６の
成形を冷間鍛造で行なっていた。つまり、棒状素材１２
１を冷間鍛造の第１工程で軸方向略中央に大径なる大径
部１１２を成形すると共に軸方向両端端面に予備センタ
ー穴１１７，１１８を成形し、第２工程で大径部１１２
の両端第１予備成形部１１３及び第２予備成形部１１４
にスプライン１０５，１０６を成形すると共に予備セン
ター穴１１７，１１８を所望するセンター穴１０７，１
０８に成形し、その後、別工程の歯切りにより大径部１
１２にギアを成形し、更に別工程の切削加工で細部を仕
上げ加工していた。
【０００４】このようにスプラインシャフト１０１を成
形する冷間鍛造方法としては特開昭６２−１６８６２６
号公報等多数ある。また、スプライン１０５，１０６と
センター穴１０７，１０８を同時加工する冷間鍛造方法
としては特公昭５８−８９３１号公報等ある。
【０００５】
【発明が解決しようとする課題】上述の如く、スプライ
ンシャフト１０１を冷間鍛造にて成形すると、加工工程
の減少化等多大なるメリットが発生する。しかしここ
で、軸方向略中央の歯形部１０２のギアは冷間鍛造後、
歯切りにより成形されるが、歯切りは加工時間が長く、
生産性が低下するということがある。
【０００６】また、冷間鍛造でスプライン１０５，１０
６及びセンター穴１０７，１０８を成形後、歯切りで歯
形部１０２のギアを成形するため、スプライン１０５，
１０６とセンター穴１０７，１０８との中心は一致する
が、歯形部１０２のギアはセンター穴１０７，１０８を
チャッキングして歯切りを行なうので、チャッキングミ
ス等による誤差を生じ、歯形部１０２のギアとセンター
穴１０７，１０８との中心が一致しないということがあ
る。
【０００７】そこで、歯形部１０２のギアをスプライン
１０５，１０６及びセンター穴１０７，１０８と同様に
冷間鍛造で成形することが考えられる。これにより歯形
部のギア、スプライン１０５，１０６及びセンター穴１
０７，１０８を同時加工できるため、加工時間を短縮す
ることができ、各々の中心を一致させることが可能とな
る。しかし、歯形部のギアを冷間鍛造で成形すると、ギ
アを押し抜くとき外側にバリが発生すると共にギアの精
度が著しく低下し、別途修正が必要となるということが
ある。
【０００８】従って本発明は上述の如き課題を解決し、
生産性が高く、安定した高精度を得るスプラインシャフ
トの冷間鍛造方法を提供することを目的とする。
【０００９】
【課題を解決するための手段】本発明の手段は以下のと
おりである。
【００１０】第１工程で棒状素材の軸方向略中央に大径
なる大径部を成形すると共に軸方向両端端面に予備セン
ター穴を成形し、第２工程で大径部の両端第１予備成形
部及び第２予備成形部にスプラインを成形し、大径部に
おける軸方向一端に余肉部を残しつつギアを成形すると
共に、予備センター穴を所望するセンター穴に成形す
る。
【００１１】
【実施例】以下本発明の実施例を図１乃至図４に基づい
て説明する。
【００１２】図１は完成スプラインシャフト１０を表
し、軸方向略中央にギアを有する歯形部２を備え、歯形
部２の軸方向一端に軸方向に延びる第１スプライン５を
有する第１小径部３を備え、歯形部２の軸方向他端に軸
方向に延びる第２スプライン６を有する第２小径部４を
備える。また、軸方向両端端面中心には内部側にセンタ
ー穴７，８が凹設されている。
【００１３】上記、完成スプラインシャフト１０を成形
する過程である冷間鍛造工程を図２乃至図４を基に説明
する。
【００１４】まず、図２の（ア）に示す如き棒状素材２
１を冷間鍛造の第１工程で、図２の（イ）に示す如き軸
方向略中央に大径なる大径部１２と、大径部１２の両端
に第１予備成形部１３及び第２予備成形部１４と、両端
端面に予備センター穴１７，１８を備えた予備成形品１
１を成形する。この工程を図３に基づいて説明する。
【００１５】まず、図の鍛造装置３０を順次説明する
と、３１は上型で、内周下部に予備成形品１１の第２予
備成形部１４の外径状を画成する上成形面３２ａを備え
た上ダイ３２と、上ダイ３２の上方に位置する上カラー
３３と、上ダイ３２と上カラー３３とを一体的に支持す
る上ホルダー３４と、上ホルダー３４を保持する保持リ
ング３７とからなる。そして、上ダイ３２と上カラー３
３との内周には、下端面から突出する上凸部３６を備え
たパンチ３５が挿入されている。また、４１は下型で、
内周上部に予備成形品１１の大径部１２及び第１予備成
形部１３の外径状を画成する下成形面４２ａを備えた下
ダイ４２と、下ダイ４２の下方に位置し下ダイ４２を支
える下カラー４３と、下ダイ４２と下カラー４３とを一
体的に支持する下ホルダー４４とからなる。そして、下
カラー４３の内周には、上端面から突出する下凸部４６
を備えたノックアウトパンチ４５が挿入される。
【００１６】上述の如き鍛造装置３０で、棒状素材２１
を予備成形品１１に成形する第１工程を説明する。
【００１７】まず、図３左半部に示す如く、下型４１の
上面に形成した型彫空間４７から下ダイ４２の下成形面
４２ａ内に棒状素材２１を挿入する。続いて図３右半部
に示す如く、上方より上型３１を下降させ、上ダイ３２
及びパンチ３５で棒状素材２１を押圧して、下ダイ４２
の中間空間４２ｂに大径部１２を張りださせ、その大径
部１２の両端に第１予備成形部１３及び第２予備成形部
１４を成形すると共にパンチ３５の上凸部３６及びノッ
クアウトパンチ４５の下凸部４６により両端面に予備セ
ンター穴１７，１８を設けて予備成形品１１を成形す
る。その後、上型３１は上方へ退避すると共にノックア
ウトパンチ４５が上方に突出して、予備成形品１１を下
型４１から取り出す。
【００１８】次に、前記予備成形品１１を冷間鍛造の第
２工程で、図２の（ウ）に示す如きスプラインシャフト
１に成形するこの工程を図４に基づいて説明する。
【００１９】まず、図の鍛造装置５０を順次説明する
と、５１は上型で、円筒状のスペーサ５８と、スペーサ
５８の外周側に位置するバックアップリング５９と、ス
ペーサ５８とバックアップリング５９との上方に位置し
内周に第１スプライン５を成形する第１スプライン歯形
５２ｃを備えた上ダイ５２と、上ダイ５２の上方に位置
する上カラー５３と、バックアップリング５９、上ダイ
５２及び上カラー５３とを一体的に支持する上ホルダー
５４と、上ホルダー５４を保持する保持リング５７とか
らなる。そして、上ダイ５２と上カラー５３との内周に
は、下端面から突出する上凸部５６を備えたパンチ５５
が挿入されている。また、６１は下型で、内周下部に歯
形部２を成形するギア歯型６２ｃを備えた下ダイ６２
と、下ダイ６２の下方に位置し内周上部に第２スプライ
ン６を成形する第２スプライン歯形６３ｃを備えた下カ
ラー６３と、下ダイ６２と下カラー６３とを一体的に支
持する下ホルダー６４とからなる。そして、下カラー６
３の内周下部には、上端面から突出する下凸部６６を備
えたノックアウトパンチ６５が挿入されている。
【００２０】上述の如き鍛造装置５０で、予備成形品１
１をスプラインシャフト１に成形する第２工程を説明す
る。
【００２１】まず、図４左半部に示す如く、下型６１の
上面に形成した型彫空間６７から下ダイ６２の下成形面
６２ａ内及び下カラー６３の先端成形面６３ａ内に、予
備成形品１１をその第２予備成形部１４側から挿入す
る。このとき予備成形品１１は第２予備成形部１４の先
端が下カラー６３の第２スプライン歯型６３ｃに当接し
て配置される。続いて図４右半部に示す如く、上方より
上型５１を下降させ、上ダイ５２で予備成形品１１を押
圧しながら、下カラー６３の第２スプライン歯型６３ｃ
で予備成形品１１の第２予備成形部１４に第２スプライ
ン６を成形すると同時に、上ダイ５２の第１スプライン
歯形５２ｃで予備成形品１１の第１予備成形部１３に第
１スプライン５を成形する。更に連続して上型５１のス
ペーサ５８で予備成形品１１の大径部１２をバックアッ
プしつつ、大径部１２の上型５１側に余肉部９を残して
ギアを成形すると共に第１スプライン５側端面のセンタ
ー穴７を仕上げる。その後、上型５１は上方へ退避する
と共にノックアウトパンチ６５が上方へ突出して、その
上端面から突出する下凸部６６により予備成形品１１の
第２スプライン６側端面のセンター穴８を仕上げつつ、
スプラインシャフト１を下型６１から取り出し、冷間鍛
造成形が完了する。
【００２２】上述の如く冷間鍛造成形されたスプライン
シャフト１は、最後に切削加工により歯形部２に成形さ
れた余肉部９を取り除くと共に細部の仕上げ加工を施し
て、図１に示す如き完成スプラインシャフト１０を成形
する。
【００２３】従って、冷間鍛造により成形されたスプラ
インシャフト１において、スプライン５，６、センター
穴７，８と共に余肉部９を成形することによりギアを有
する歯形部２を成形することが可能となる。また、スプ
ライン５，６、センター穴７，８及び歯形部２が冷間鍛
造で同時成形されるため、各々の同芯度を的確に得るこ
とができる。
【００２４】
【発明の効果】以上のように本発明によれば、第１工程
で棒状素材の軸方向略中央に大径なる大径部を成形する
と共に軸方向両端端面に予備センター穴を成形し、第２
工程で大径部の両端第１予備成形部及び第２予備成形部
にスプラインを成形し、大径部における軸方向一端に余
肉部を残しつつギアを成形すると共に、予備センター穴
を所望するセンター穴に成形するため、スプライン、セ
ンター穴と共に、余肉部を成形することによりギアを有
する歯形部を成形することが可能となるので、歯形部を
成形する歯切り工程が不要となり、生産性を高めること
ができる。また、スプライン、センター穴及び歯形部が
冷間鍛造で同時成形されるため、各々の同芯度を的確に
得ることができるので、安定した高精度のスプラインシ
ャフトを成形することができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging method for cold forging a spline shaft widely used for transmission parts of automobiles. 2. Description of the Related Art At present, as a method of manufacturing a spline shaft widely used for a transmission part of an automobile, etc.,
Cold forging has been widely applied for the purpose of saving materials and reducing the number of processing steps. Therefore, as shown in FIG. 1, a first small-diameter portion 1 having a tooth profile portion 102 having a gear substantially at the center in the axial direction and having a first spline 105 at one end in the axial direction of the tooth profile portion 102 is provided.
03, in the completed spline shaft 110 provided with the second small-diameter portion 104 having the second spline 106 at the other end, as shown in FIG. 5, the splines 105 and 106 were formed by cold forging. That is, the rod-shaped material 12
In the first step of cold forging, a large-diameter portion 112 having a large diameter is formed substantially at the center in the axial direction, and preliminary center holes 117 and 118 are formed at both end surfaces in the axial direction.
Both ends of the first preforming portion 113 and the second preforming portion 114
The spline 105, 106 is formed in the center hole 107, 1
08, and then the large-diameter portion 1
The gear was molded into 12, and the details were finished by a cutting process in another process. A cold forging method for forming the spline shaft 101 as described above is disclosed in Japanese Patent Application Laid-Open No. Sho 62-168626.
There are many publications. A cold forging method for simultaneously processing the splines 105 and 106 and the center holes 107 and 108 is disclosed in Japanese Patent Publication No. 58-8931. [0005] As described above, when the spline shaft 101 is formed by cold forging, great merit such as a reduction in the number of processing steps is generated. However, here, the gear of the tooth profile portion 102 substantially at the center in the axial direction is cold forged,
It is formed by gear cutting.
Productivity may decrease. Further, splines 105 and 10 are formed by cold forging.
6 and the center holes 107 and 108, the splines 105,
Although the center of the center hole 107 coincides with the center of the center hole 107, 108, the gear of the tooth profile portion 102 performs the gear cutting by chucking the center hole 107, 108. The centers of the gears and the center holes 107 and 108 may not coincide. Therefore, it is conceivable that the gear of the tooth profile portion 102 is formed by cold forging, like the splines 105 and 106 and the center holes 107 and 108. As a result, the gears, splines 105 and 106, and
Since 07 and 108 can be processed at the same time, the processing time can be shortened, and the centers can be matched. However, if the gears of the tooth profile are formed by cold forging, burrs are generated on the outside when the gears are pushed out, and the precision of the gears is remarkably reduced. Accordingly, the present invention solves the above-mentioned problems,
An object of the present invention is to provide a cold forging method for a spline shaft that has high productivity and obtains stable and high accuracy. [0009] The means of the present invention are as follows. In the first step, a large diameter portion having a large diameter is formed substantially at the center in the axial direction of the rod-shaped material, and preliminary center holes are formed in both end surfaces in the axial direction. In the second step, both ends of the large diameter portion are first preformed. A spline is formed in the portion and the second preforming portion, a gear is formed while leaving a marginal portion at one axial end of the large diameter portion, and a preparatory center hole is formed into a desired center hole. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a completed spline shaft 10 having a toothed portion 2 having a gear at substantially the center in the axial direction, and a first small diameter portion 3 having a first spline 5 extending axially at one axial end of the toothed portion 2. And a second small-diameter portion 4 having a second spline 6 extending in the axial direction at the other axial end of the tooth profile portion 2. In addition, center holes 7, 8 are recessed on the inner side at the center of both end faces in the axial direction. The cold forging process, which is the process of forming the completed spline shaft 10, will be described with reference to FIGS. First, a rod-shaped material 2 as shown in FIG.
1 is a first step of cold forging, and includes a large diameter portion 12 having a large diameter substantially at the center in the axial direction as shown in FIG. 2A, a first preformed portion 13 and a second large diameter portion 12 at both ends of the large diameter portion 12. A preformed part 1 having a preformed part 14 and preliminary center holes 17 and 18 at both end surfaces.
Mold 1. This step will be described with reference to FIG. First, the forging apparatus 30 shown in the figure will be described in order. An upper die 31 has an upper forming surface 32a which defines the outer diameter of the second preforming portion 14 of the preform 11 at the lower portion of the inner periphery. The upper die 32, an upper collar 33 located above the upper die 32, an upper holder 34 that integrally supports the upper die 32 and the upper collar 33, and a holding ring 37 that holds the upper holder 34. . And upper die 32 and upper collar 3
A punch 35 having an upper convex portion 36 protruding from the lower end surface is inserted into the inner periphery of the punch 3. Also, 41 is a lower mold,
A lower die 42 having a lower forming surface 42a defining an outer diameter of the large-diameter portion 12 of the preformed product 11 and the first preformed portion 13 in an upper portion of the inner periphery, and a lower die positioned below the lower die 42. The lower collar 43 supports the lower die 42 and the lower holder 44 that integrally supports the lower die 42 and the lower collar 43. A lower convex portion 46 protruding from the upper end surface is provided on the inner periphery of the lower collar 43.
Is inserted. The forging device 30 as described above is used to
The first step of molding the preform 11 into the preform 11 will be described. First, as shown in the left half of FIG. 3, the bar-shaped material 21 is inserted into the lower forming surface 42a of the lower die 42 from the die-forming space 47 formed on the upper surface of the lower die 41. Subsequently, as shown in the right half of FIG.
Then, the bar-shaped material 21 is pressed by the punch 35 and the lower die 42 is pressed.
The large diameter portion 12 is projected in the intermediate space 42b, and the first preformed portion 13 and the second preformed portion 14 are formed at both ends of the large diameter portion 12, and the upper convex portion 36 and the knockout punch 45 of the punch 35 are formed. Preliminarily formed holes 11 and 18 are provided at both end surfaces by the lower convex portion 46 to form the preformed product 11. Thereafter, the upper mold 31 is retracted upward, and the knockout punch 45 projects upward, and the preform 11 is removed from the lower mold 41. Next, the step of forming the preformed article 11 into a spline shaft 1 as shown in FIG. 2C in the second step of cold forging will be described with reference to FIG. First, the forging device 50 shown in the figure will be described sequentially. Reference numeral 51 denotes an upper die, a cylindrical spacer 58, a backup ring 59 located on the outer peripheral side of the spacer 58, and an upper part of the spacer 58 and the backup ring 59. , An upper die 52 having a first spline tooth profile 52c for molding the first spline 5 on the inner periphery, an upper collar 53 located above the upper die 52, a backup ring 59, an upper die 52, and an upper collar 53 , And a holding ring 57 for holding the upper holder 54. A punch 55 having an upper convex portion 56 protruding from the lower end surface is provided on the inner periphery of the upper die 52 and the upper collar 53.
Is inserted. Reference numeral 61 denotes a lower die, and a lower die 62 provided with a gear tooth mold 62c for forming the tooth profile 2 at the lower portion of the inner periphery.
A lower collar 63 provided below the lower die 62 and having a second spline tooth profile 63c for forming the second spline 6 on an inner peripheral upper portion; and a lower holder integrally supporting the lower die 62 and the lower collar 63. 64. And lower color 6
A knockout punch 65 having a lower protruding portion 66 protruding from the upper end surface is inserted into a lower portion of the inner periphery of 3. With the forging device 50 as described above, the preform 1
The second step of forming the first shaft 1 into the spline shaft 1 will be described. First, as shown in the left half of FIG. 4, the preforming is performed from the engraving space 67 formed on the upper surface of the lower die 61 into the lower forming surface 62 a of the lower die 62 and the tip forming surface 63 a of the lower collar 63. The product 11 is inserted from the second preforming portion 14 side. At this time, the preform 11 is arranged such that the tip of the second preform 14 abuts on the second spline tooth 63 c of the lower collar 63. Subsequently, as shown in the right half of FIG. 4, the upper die 51 is lowered from above and the second die spline 63 c of the lower collar 63 is pressed while pressing the preform 11 with the upper die 52.
At the same time, the second spline 6 is formed in the second preforming section 14 of the preform 11, and at the same time, the first spline 5 is formed in the first preforming section 13 of the preform 11 by the first spline tooth profile 52 c of the upper die 52. I do. Further, while continuously backing up the large diameter portion 12 of the preformed product 11 with the spacer 58 of the upper die 51, the gear is formed while leaving the excess thickness 9 on the upper die 51 side of the large diameter portion 12, and the first spline is formed. Finish the center hole 7 on the 5 side end face. Thereafter, the upper die 51 is retracted upward, and the knockout punch 65 projects upward, and the center hole 8 on the end surface of the preformed product 11 on the second spline 6 side is finished by the lower convex portion 66 projecting from the upper end surface thereof.
The spline shaft 1 is removed from the lower mold 61, and the cold forging is completed. The spline shaft 1 which has been cold forged as described above is subjected to a finishing process as shown in FIG. The spline shaft 10 is formed. Therefore, in the spline shaft 1 formed by cold forging, it is possible to form the toothed portion 2 having a gear by forming the surplus portion 9 together with the splines 5, 6 and the center holes 7, 8. Become. Further, since the splines 5 and 6, the center holes 7 and 8 and the tooth profile 2 are simultaneously formed by cold forging, the concentricity of each can be accurately obtained. As described above, according to the present invention, in the first step, a large-diameter portion having a large diameter is formed substantially at the center of the rod-shaped material in the axial direction, and preliminary center holes are formed at both end surfaces in the axial direction. And the second
In the process, splines are formed at the first and second preformed portions at both ends of the large diameter portion, and while forming a gear while leaving a marginal portion at one axial end of the large diameter portion, a preliminary center hole is desired. Since it is formed in the center hole, it is possible to form the toothed part having the gear by forming the excess part together with the spline and the center hole. Can be increased. Further, since the spline, the center hole, and the tooth profile are simultaneously formed by cold forging, the concentricity of each can be accurately obtained, so that a stable and high-precision spline shaft can be formed.
【図面の簡単な説明】
【図１】完成スプラインシャフトの斜視図である。
【図２】本発明の実施例による棒状素材からスプライン
シャフトに至る過程を示した断面平面図である。
【図３】本発明の実施例による冷間鍛造の第１工程を表
し、左半部が成形前、右半部が成形後の状態を表す部分
断面平面図である。
【図４】本発明の実施例による冷間鍛造の第２工程を表
し、左半部が成形前、右半部が成形後の状態を表す部分
断面平面図である。
【図５】従来の棒状素材からスプラインシャフトに至る
過程を示した断面平面図である。
【符号の説明】
２ 歯形部
３ 第１小径部
４ 第２小径部
５ 第１スプライン
６ 第２スプライン
７ センター穴
８ センター穴
９ 余肉部
１２ 大径部
１３ 第１予備成形部
１４ 第２予備成形部
１７ 予備センター穴
１８ 予備センター穴
２１ 棒状素材BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a completed spline shaft. FIG. 2 is a cross-sectional plan view showing a process from a rod-shaped material to a spline shaft according to an embodiment of the present invention. FIG. 3 is a partial cross-sectional plan view illustrating a first step of cold forging according to an embodiment of the present invention, in which a left half portion is before molding and a right half portion is after molding. FIG. 4 is a partial cross-sectional plan view illustrating a second step of the cold forging according to the embodiment of the present invention, in which a left half portion is before forming and a right half portion is after forming. FIG. 5 is a cross-sectional plan view showing a process from a conventional rod-shaped material to a spline shaft. [Description of Signs] 2 Toothed portion 3 First small diameter portion 4 Second small diameter portion 5 First spline 6 Second spline 7 Center hole 8 Center hole 9 Extra thickness portion 12 Large diameter portion 13 First preformed portion 14 Second preliminary Molding part 17 Spare center hole 18 Spare center hole 21 Bar-shaped material
───────────────────────────────────────────────────── フロントページの続き (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 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) B21J 1/00-13/14 B21J 17/00-19/04 B21K 1/00-31/00
Claims (1)
（２）を備え、該歯形部（２）の軸方向一端に第１スプ
ライン（５）を有する第１小径部（３）を備え、歯形部
（２）の軸方向他端に第２スプライン（６）を有する第
２小径部（４）を備えたスプラインシャフトの冷間鍛造
方法において、第１工程で棒状素材（２１）の軸方向略
中央に大径なる大径部（１２）を成形すると共に軸方向
両端端面に予備センター穴（１７），（１８）を成形
し、第２工程で前記大径部（１２）の両端第１予備成形
部（１３）及び第２予備成形部（１４）にスプライン
（５），（６）を成形し、前記大径部（１２）における
軸方向一端に余肉部（９）を残しつつギアを成形すると
共に、前記予備センター穴（１７），（１８）を所望す
るセンター穴（７），（８）に成形することを特徴とす
るスプラインシャフトの冷間鍛造方法。(1) A toothed portion (2) having a gear at substantially the center in the axial direction, and a first spline (5) at one axial end of the toothed portion (2). In the cold forging method of a spline shaft provided with one small diameter portion (3) and provided with a second small diameter portion (4) having a second spline (6) at the other axial end of the tooth profile portion (2), A large-diameter portion (12) having a large diameter is formed substantially at the center in the axial direction of the rod-shaped material (21), and preliminary center holes (17) and (18) are formed at both end surfaces in the axial direction. Splines (5) and (6) are formed on the first and second preformed portions (13) and (14) at both ends of the large diameter portion (12), and an extra end in the axial direction of the large diameter portion (12) is formed. The gear is formed while leaving the meat portion (9), and the spare center holes (17) and (18) are formed in the desired positions. Tha hole (7), cold forging method of the spline shaft, characterized in that the molding (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34742093A JP3407148B2 (en) | 1993-12-24 | 1993-12-24 | Cold forging method of spline shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34742093A JP3407148B2 (en) | 1993-12-24 | 1993-12-24 | Cold forging method of spline shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07185727A JPH07185727A (en) | 1995-07-25 |
| JP3407148B2 true JP3407148B2 (en) | 2003-05-19 |
Family
ID=18390111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34742093A Expired - Lifetime JP3407148B2 (en) | 1993-12-24 | 1993-12-24 | Cold forging method of spline shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3407148B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5093003B2 (en) * | 2008-08-29 | 2012-12-05 | トヨタ自動車株式会社 | Spline shaft and method for manufacturing spline shaft |
| JP5503468B2 (en) * | 2010-09-03 | 2014-05-28 | 本田技研工業株式会社 | Variable valve timing valve |
| CN102862020B (en) * | 2011-07-07 | 2014-12-31 | 梦想科技股份有限公司 | Input shaft of steering device for car and manufacturing method thereof |
| KR101338374B1 (en) * | 2012-04-25 | 2013-12-06 | 주식회사 디와이메탈웍스 | method for manufacturing automobile input shaft of which concentricity is maintained |
| CN102699261B (en) * | 2012-06-08 | 2015-06-03 | 上海纳铁福传动系统有限公司 | Method for forging central hole of spline shaft forging |
| CN111531098A (en) * | 2020-04-28 | 2020-08-14 | 思进智能成形装备股份有限公司 | Cold heading forming process of automobile safety belt torsion shaft |
| CN112935721A (en) * | 2021-02-02 | 2021-06-11 | 宁波甬微集团有限公司 | Manufacturing method of air conditioner compressor crankshaft |
| CN113000768B (en) * | 2021-03-23 | 2023-02-03 | 郑州机械研究所有限公司 | Cold precision forming device and forming process for linkage shaft of cycloid hydraulic motor |
-
1993
- 1993-12-24 JP JP34742093A patent/JP3407148B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07185727A (en) | 1995-07-25 |
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