JPH11138232A - Forging method of gear and gear forging method for correcting phase shift - Google Patents
Forging method of gear and gear forging method for correcting phase shiftInfo
- Publication number
- JPH11138232A JPH11138232A JP30454297A JP30454297A JPH11138232A JP H11138232 A JPH11138232 A JP H11138232A JP 30454297 A JP30454297 A JP 30454297A JP 30454297 A JP30454297 A JP 30454297A JP H11138232 A JPH11138232 A JP H11138232A
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- Prior art keywords
- forging
- tooth
- gear
- annular
- die
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、歯車鍛造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear forging method.
【０００２】[0002]
【従来の技術】冷間鍛造により製造される歯形部品の精
度をさらに向上するための手法として、例えば粗材（ワ
ーク）に付与される鍛造型の加圧力を高くすることが考
えられる。しかし、前記加圧力を高くすると鍛造型にか
かる負担が増しその耐久性を低下させ、設備上のコスト
が増す。2. Description of the Related Art As a technique for further improving the accuracy of tooth-shaped parts manufactured by cold forging, for example, it is conceivable to increase the pressing force of a forging die applied to a coarse material (work). However, if the pressure is increased, the load on the forging die is increased, the durability is reduced, and the equipment cost is increased.
【０００３】そこで、鍛造型に加圧された粗材の塑性変
形時の材料の流れの一部を、歯形部を形成する型面領域
を除く他の領域に移動可能なスペースを鍛造型内に設
け、前記材料の流れの一部を逃がす（材料の流れを分流
する）ことによって加工力を高めずに前記目的を達成し
得る分流方式が知られている。例えば、特開平５ー２３
７５８６号公報には、予め、所定加工量鍛造成形された
リング状中間鍛造品の外周側の一部を自由表面とし、か
つこのリング状中間鍛造品を下ポンチと上ポンチとによ
る加圧時に、塑性変形させつつある材料の一部を自由表
面側に逃がし、フランジとして張出すことによって、比
較的低い成形荷重で内歯歯形を成形する成形方法が開示
されている。[0003] Therefore, a space is provided in the forging die where a part of the flow of the material during the plastic deformation of the coarse material pressed into the forging die can be moved to other regions except the die surface region forming the tooth profile. There is known a flow dividing method in which the above-mentioned object can be achieved without increasing the processing force by releasing a part of the material flow (dividing the material flow). For example, JP-A-5-23
No. 7586, in advance, a part of the outer peripheral side of a ring-shaped intermediate forged product forged by a predetermined processing amount is a free surface, and when this ring-shaped intermediate forged product is pressed by a lower punch and an upper punch, A forming method is disclosed in which a part of a material undergoing plastic deformation is released to a free surface side and is protruded as a flange to form an internal tooth profile with a relatively low forming load.
【０００４】[0004]
【発明が解決しようとする課題】（１）前記公報に開示
された成形方法の場合には、下ポンチと上ポンチとによ
る前記中間鍛造品の加圧時に、塑性変形しつつある材料
の一部を自由表面側に逃がすことができる。このため、
下ポンチと上ポンチとは、型面に作用する面圧（材料の
加圧時に型面にかかる反力）を低減でき、耐久性を向上
し得る。(1) In the case of the molding method disclosed in the above publication, a part of the material that is undergoing plastic deformation when the intermediate forging is pressed by the lower punch and the upper punch. Can escape to the free surface side. For this reason,
The lower punch and the upper punch can reduce the surface pressure acting on the mold surface (reaction force applied to the mold surface when the material is pressed), and can improve the durability.
【０００５】しかし、前記従来の成形方法によると、例
えば、自由表面を設定した領域から離れた位置に型面を
設けた場合や、歯形の形状を複雑にした場合などでは、
加圧時の材料に当接する型面に作用する面圧を低減する
効果が小さくなる。この理由としては、型面に接する側
への材料の充填に要する材料移動量が大きくなり、これ
に比例する摩擦で面圧（加工力）が増加するからである
と考えられる。However, according to the conventional molding method, for example, when a mold surface is provided at a position distant from a region where a free surface is set, or when a tooth profile is complicated,
The effect of reducing the surface pressure acting on the mold surface in contact with the material during pressurization is reduced. It is considered that the reason for this is that the amount of material transfer required for filling the material in contact with the mold surface increases, and the surface pressure (working force) increases due to the proportional friction.
【０００６】前記型面に作用する面圧を低減する効果が
小さくなると、歯形部充填の材料流れの抵抗が増すた
め、材料を型面に沿って良好に充填できず歯形の成形精
度が低下する。このため改善の余地がある。 （２）また、冷間鍛造により粗材から鍛造製歯車を製造
する場合において、トランスファー装置システム内の異
なる位置で順に配設された複数の鍛造装置（例えば、荒
地鍛造型を備えた鍛造装置および仕上げ鍛造型を備えた
鍛造装置）により、別々に鍛造工程を施す場合などで
は、前工程で歯車の原形形状に形成された鍛造中間品
（ワーク）を、トランスファー搬送装置によって後工程
（次工程）の仕上げ鍛造型に搬送移動し、加工基準位置
にセットするように構成されている。If the effect of reducing the surface pressure acting on the mold surface is reduced, the resistance of the material flow at the filling of the tooth profile is increased, so that the material cannot be filled well along the mold surface and the molding accuracy of the tooth profile decreases. . This leaves room for improvement. (2) Further, in the case of manufacturing a forged gear from a rough material by cold forging, a plurality of forging devices (for example, a forging device having a rough land forging die and In the case where separate forging processes are performed by a forging device equipped with a finish forging die), the forged intermediate product (work) formed in the original shape of the gear in the previous process is transferred to the post-process (next process) by the transfer transfer device. Is transported to the finish forging die and set at the processing reference position.
【０００７】ここで、トランスファー搬送装置は、動き
をスムーズにするための配慮として予め、若干の遊びが
設けられている。ところが、仕上げ用鍛造型の加工基準
位置に鍛造中間品をセットするに際して、前記トランス
ファー搬送装置の遊びが起因し、鍛造中間品と仕上げ用
鍛造型とに周方向の位相ずれを発生する場合がある。[0007] Here, the transfer transport device is provided with some play beforehand as a consideration for smooth movement. However, when the forging intermediate is set at the processing reference position of the finishing forging die, play in the transfer conveyance device may be caused to cause a circumferential phase shift between the forging intermediate and the finishing forging die. .
【０００８】すると、仕上げ用鍛造型に形成されている
型面の周方向に等間隔に形成された凹凸（歯溝と歯）
と、前記仕上げ用鍛造型の凹凸に嵌めるべき、鍛造中間
品の周方向に等間隔に形成された凸凹（歯形成部分と歯
溝形成部分）とが周方向の位相差により、正規の位置で
嵌まり合わず、型面あるいは鍛造中間品にかじりが発生
し、成形後の製品精度を低下させる。[0008] Then, irregularities (tooth grooves and teeth) formed at equal intervals in the circumferential direction of the die surface formed on the finishing forging die.
And irregularities (tooth-forming portion and tooth-groove-forming portion) formed at regular intervals in the circumferential direction of the forging intermediate product to be fitted into the unevenness of the finishing forging die, at regular positions due to a circumferential phase difference. They do not fit, and galling occurs on the mold surface or the forged intermediate product, which lowers the product accuracy after molding.
【０００９】本第１発明は、前記（１）の不具合を解決
することのできる歯車鍛造方法を提供することを課題と
する。本第２発明は、前記（１）および（２）の不具合
を解決することのできる位相ズレを修正する歯車鍛造方
法を提供することを課題とする。An object of the first invention is to provide a gear forging method capable of solving the problem (1). A second object of the present invention is to provide a gear forging method for correcting a phase shift that can solve the problems (1) and (2).
【００１０】[0010]
【発明の解決手段】第１発明の歯車鍛造方法は、歯車の
原形形状の型面をもつ荒地鍛造型を用い、所定の半径で
軸方向に厚い歯形環状頭部と、該歯形環状頭部に連設さ
れ該歯形環状頭部の厚さより薄い厚さの環状首部とをも
つ中間鍛造品を粗材から鍛造する第１鍛造工程と、歯車
形状の型面と、該環状首部の軸方向の両面の少なくとも
一方に対向する環状自由空間とをもつ仕上げ鍛造型を用
い、該歯形環状頭部の一部を該環状自由空間に流入させ
つつ該歯形環状頭部を該歯車形状とする第２鍛造工程
と、よりなることを特徴とする。According to a first aspect of the present invention, there is provided a gear forging method comprising: using a rough ground forging die having a mold surface of an original shape of a gear; A first forging step of forging an intermediate forging from a rough material having an annular neck portion having a thickness smaller than the thickness of the toothed annular head portion, a gear-shaped mold surface, and both surfaces of the annular neck portion in the axial direction; A second forging step of forming the tooth-shaped annular head into the gear shape while allowing a part of the tooth-shaped annular head to flow into the annular free space by using a finishing forging die having an annular free space opposed to at least one of the two. And characterized by the following.
【００１１】第２発明の位相ズレを修正する歯車鍛造方
法は、歯車の原形形状および歯車の軸心線に対し所定の
抜き勾配に形成された型面をもつ荒地鍛造型を用い、抜
き勾配に形成され所定の半径で軸方向に厚い歯形環状頭
部と、該歯形環状頭部に連設され該歯形環状頭部の厚さ
より薄い厚さの環状首部とをもつ中間鍛造品を粗材から
鍛造する第１鍛造工程と、抜き勾配に形成された歯車形
状の型面と、該環状首部の軸方向の両面の少なくとも一
方に対向する環状自由空間とをもつ仕上げ鍛造型を用
い、該歯形環状頭部の一部を該環状自由空間に流入させ
つつ該歯形環状頭部を該歯車形状とする第２鍛造工程
と、該歯車形状の歯形部をサイジングするサイジング工
程と、よりなることを特徴とする。According to a second aspect of the present invention, there is provided a gear forging method for correcting a phase shift, wherein a rough land forging die having a mold surface formed at a predetermined draft with respect to the original shape of the gear and the axis of the gear is used. Forging, from a coarse material, an intermediate forging having a formed annular head with a predetermined radius in the axial direction and having a thickness that is thicker in the axial direction, and an annular neck that is connected to the annular head and has a thickness smaller than the thickness of the annular head. Using a finishing forging die having a first forging process, a gear-shaped mold surface formed at a draft angle, and an annular free space facing at least one of both axial surfaces of the annular neck portion, A second forging step of making the tooth-shaped annular head into the gear shape while allowing a part of the part to flow into the annular free space; and a sizing step of sizing the gear-shaped tooth shape portion. .
【００１２】[0012]
【発明の実施の形態】第１発明の歯車鍛造方法（以下、
第１発明と称す）を適用できる歯車としては、外歯歯
車、内歯歯車などである。第１鍛造工程で粗材から鍛造
される中間鍛造品は、歯車の原形形状のものであり、所
定半径で軸方向に厚い歯形環状頭部と、歯形環状頭部に
連設され歯形環状頭部の厚さより薄い厚さの環状首部と
をもつ。BEST MODE FOR CARRYING OUT THE INVENTION The gear forging method of the first invention (hereinafter referred to as "the gear forging method").
Gears to which the first invention can be applied include external gears and internal gears. The intermediate forged product forged from the crude material in the first forging step is a prototype of a gear, and has a tooth-shaped annular head thick in the axial direction with a predetermined radius, and a tooth-shaped annular head connected to the tooth-shaped annular head. An annular neck having a thickness smaller than the thickness of the annular neck.
【００１３】この中間鍛造品による歯車の原形形状は、
製造目的とする製品が外歯歯車である場合と、内歯歯車
である場合とによって、歯形環状頭部と環状首部との半
径方向の位置が互いに逆位置となる。すなわち、外歯歯
車を製造する場合では、半径外周側に歯形環状頭部が形
成され、半径内周側に前記環状首部が形成された歯車の
原形形状となる。また、内歯歯車を製造する場合では、
半径外周側に環状首部が形成され、半径内周側に歯形環
状頭部が形成された歯車の原形形状となる。The original shape of the gear by this intermediate forging is:
Depending on whether the product to be manufactured is an external gear or an internal gear, the radial positions of the tooth-shaped annular head and the annular neck are opposite to each other. That is, when an external gear is manufactured, the gear has the original shape of a gear in which a tooth-shaped annular head is formed on the radially outer side and the annular neck is formed on the radially inner side. Also, when manufacturing internal gears,
The gear has the original shape of a gear in which an annular neck is formed on the radially outer side and a toothed annular head is formed on the radially inner side.
【００１４】第１鍛造工程で用いる荒地鍛造型として
は、歯車の原形形状の型面を形成する下型と上型を接近
する方向および遠ざかる方向に相対移動し、粗材から中
間鍛造品を鍛造することができるものであればよく、下
型と上型の両方が可動する方式のものや、下型と上型の
いずれか一方が固定され他方が可動する方式のものなど
を用いることができる。As a rough land forging die used in the first forging step, a lower die and an upper die which form a mold surface of a gear original shape are relatively moved in a direction of approaching and moving away from each other, and an intermediate forged product is forged from a coarse material. Any type can be used as long as it can be used, such as a type in which both the lower die and the upper die are movable, a type in which one of the lower die and the upper die is fixed and the other is movable, and the like can be used. .
【００１５】下型と上型のいずれか一方は、歯形環状頭
部の前記周端部分側に、周方向に沿って等間隔に形成さ
れ、かつ最終形状に至る途中形状の歯および歯溝とを交
互に形成するための歯面をもつ。歯形環状頭部および歯
形環状頭部に連設された環状首部とは、歯車の軸心線に
同心円状に形成される。One of the lower mold and the upper mold is formed on the side of the peripheral end of the tooth-shaped annular head at regular intervals along the circumferential direction, and has teeth and tooth grooves of an intermediate shape reaching the final shape. Are alternately formed. The tooth-shaped annular head and the annular neck connected to the tooth-shaped annular head are formed concentrically with the axis of the gear.
【００１６】歯形環状頭部は、半径方向に環状首部が連
設されていない周端部分側に、周方向に沿って等間隔に
形成され、かつ最終形状に至る途中形状の歯と歯溝とが
交互に形成されている。歯形環状頭部の歯車の軸心線に
沿う厚さは、製造目的とする歯車の種類に応じて種々設
定できる。The tooth-shaped annular head is formed on the peripheral end portion side where the annular neck portion is not continuously provided in the radial direction at regular intervals along the circumferential direction, and includes teeth and tooth grooves having an intermediate shape reaching the final shape. Are formed alternately. The thickness of the toothed annular head along the axis of the gear can be variously set according to the type of gear to be manufactured.
【００１７】第２鍛造工程で用いる仕上げ鍛造型として
は、仕上げ鍛造型歯車形状の型面と、環状首部の軸方向
の両面の少なくとも一方に対向する環状自由空間とをも
つ。環状自由空間は、環状首部の軸方向の両面に対向す
る位置に形成されたものや、環状首部の軸方向の両面の
うち、いずれか一方のみに対向する位置に形成されたも
のなどとすることができる。The finish forging die used in the second forging step has a die surface in the shape of a finish forging die gear and an annular free space opposed to at least one of both axial sides of the annular neck. The annular free space may be formed at a position facing both surfaces in the axial direction of the annular neck portion, or may be formed at a position facing only one of both axial surfaces of the annular neck portion. Can be.
【００１８】第２鍛造工程で用いる仕上げ鍛造型として
は、塑性変形させた歯形環状頭部を歯車形状にすること
ができる歯面と、塑性変形させた歯形環状頭部を半径方
向に流入させることが可能で前記歯面に近い領域に形成
され環状自由空間とをもつ。仕上げ鍛造型としては、歯
車形状の歯面および環状首部の軸方向の両面の少なくと
も一方に対向する環状自由空間とをもつ仕上げ用下型
と、仕上げ用上型とをもつものを用いることができる。As the finish forging die used in the second forging step, a plastically deformed tooth-shaped annular head can be formed into a gear shape, and a plastically deformed tooth-shaped annular head is caused to flow in a radial direction. And an annular free space formed in a region near the tooth surface. As the finish forging die, a die having a lower finishing die having an annular free space facing at least one of the gear-shaped tooth surface and at least one of both surfaces in the axial direction of the annular neck portion and an upper finishing die can be used. .
【００１９】仕上げ鍛造型としては、歯車形状の歯面お
よび環状首部の軸方向の両面の少なくとも一方に対向す
る環状自由空間とをもつ仕上げ用下型と、仕上げ用上型
とを接近する方向および遠ざかる方向に相対移動し、中
間鍛造品から歯車製品を鍛造することができるものであ
ればよく、仕上げ用下型と仕上げ用上型の両方が可動す
る方式のものや、仕上げ用下型と仕上げ用上型のいずれ
か一方が固定され他方が可動する方式のものなどを用い
ることができる。The finishing forging die includes a lower finishing die having at least one of a gear-shaped tooth surface and an annular free space opposed to at least one of both surfaces in the axial direction of the annular neck, and a direction approaching the upper finishing die. Any type that can move in the direction away from it and be able to forge gear products from intermediate forged products, such as a system in which both the lower die for finishing and the upper die for finishing are movable, and a lower die for finishing and finishing A type in which one of the upper molds is fixed and the other is movable can be used.
【００２０】仕上げ用下型と仕上げ用上型のいずれか一
方は、中間鍛造品に歯車形状の歯面を形成するために、
周方向に沿って等間隔に形成され、かつ歯車形状の歯お
よび歯溝とを交互に形成するための歯面をもつ。第２鍛
造工程での仕上げ鍛造型によって、第１鍛造工程で得ら
れた中間鍛造品を歯車形状に仕上げ鍛造する場合には、
仕上げ用下型と仕上げ用上型の両方が可動する方式のも
のや、仕上げ用下型と仕上げ用上型のいずれか一方が固
定され他方が可動する方式のものなどを用いることがで
きる。One of the finishing lower die and the finishing upper die is used to form a gear-shaped tooth surface on the intermediate forged product.
It is formed at equal intervals along the circumferential direction, and has tooth surfaces for alternately forming gear-shaped teeth and tooth spaces. In the case where the intermediate forging obtained in the first forging step is finish forged into a gear shape by the finishing forging die in the second forging step,
A type in which both the lower and upper finishing dies are movable, or a type in which one of the lower and upper finishing dies is fixed and the other is movable can be used.
【００２１】なお、例えば、仕上げ用下型が固定され、
仕上げ用上型が仕上げ用下型に対し可動する方式、すな
わち、いわゆる片打ち機構プレスを用いる場合では、予
め、、仕上げ鍛造型の基準位置にセットした中間鍛造品
に対し、仕上げ用上型による流動拘束量＞仕上げ用下型
による流動拘束量との関係に設定することによって、中
間鍛造品にかかる仕上げ用上型の面圧と、仕上げ用下型
の面圧とがほぼ均一になり、製品品質を向上できるよう
に配慮する必要がある。For example, the lower die for finishing is fixed,
The method in which the upper die for finishing is movable with respect to the lower die for finishing, that is, in the case of using a so-called single-punch mechanism press, in advance, for the intermediate forged product set at the reference position of the finishing forging die, the upper die for finishing is used. By setting the relationship between the flow constraint amount and the flow constraint amount by the lower die for finishing, the surface pressure of the upper die for finishing and the surface pressure of the lower die for finishing on the intermediate forged product become almost uniform, and the product Care must be taken to improve quality.
【００２２】第１発明によると、第１鍛造工程では、歯
車の原形形状の型面をもつ荒地鍛造型を用い、所定半径
で軸方向に厚い歯形環状頭部と、歯形環状頭部に連設さ
れ該歯形環状頭部の厚さより薄い厚さの環状首部とをも
つ中間鍛造品を粗材から鍛造する。前記第１鍛造工程に
引き続き施される第２鍛造工程では、歯車形状の型面
と、環状首部の軸方向の両面の少なくとも一方に対向す
る環状自由空間とをもつ仕上げ鍛造型を用い、歯形環状
頭部の一部を環状自由空間に流入させつつ歯形環状頭部
を歯車形状とする。According to the first invention, in the first forging step, a rough land forging die having a mold surface of the original shape of the gear is used, and a tooth-shaped annular head thick in the axial direction with a predetermined radius and a tooth-shaped annular head are continuously provided. Then, an intermediate forging having an annular neck portion having a thickness smaller than the thickness of the toothed annular head is forged from a rough material. In the second forging step, which is performed subsequent to the first forging step, using a finishing forging die having a gear-shaped mold surface and an annular free space opposed to at least one of both surfaces in the axial direction of the annular neck portion, A part of the head is made to flow into the ring-shaped free space while the tooth-shaped ring-shaped head is formed into a gear shape.
【００２３】自由空間とは、塑性変形時の材料を流入で
き、かつ流入した材料で全てが埋まることのない容積の
空間を称す。中間鍛造品は、歯形環状頭部と、歯形環状
頭部に連設され歯形環状頭部の厚さより薄い厚さの環状
首部とをもつ形状のものであり、この中間鍛造品を仕上
げ鍛造する仕上げ鍛造型は、歯車形状の型面と、中間鍛
造品の環状首部の軸方向の両面の少なくとも一方に対向
する環状自由空間とをもつ。The free space refers to a space having a volume into which a material at the time of plastic deformation can flow, and which is not completely filled with the flowed material. The intermediate forged product is of a shape having a tooth-shaped annular head and an annular neck portion connected to the tooth-shaped annular head and having a thickness smaller than the thickness of the tooth-shaped annular head. The forging die has a gear-shaped die surface and an annular free space facing at least one of both axial surfaces of the annular neck portion of the intermediate forged product.
【００２４】すなわち、仕上げ鍛造型は、歯形環状頭部
に仕上げ成形される歯形部に近い位置に形成された環状
自由空間をもつ。このため、加圧された歯形環状頭部
は、型面に沿い形成される歯形部の近い位置で塑性変形
する材料の一部を環状自由空間に逃がすことができ、仕
上げ鍛造型の型面に作用する面圧を低減する効果が得ら
れ、この分、下型と上型との荷重負担を低減する効果が
得られ、かつ耐久性を向上し得る。That is, the finish forging die has an annular free space formed at a position close to the tooth shape portion to be finish-molded on the tooth shape annular head. For this reason, the pressurized annular tooth head can release a part of the plastically deformed material into the annular free space at a position close to the tooth shape formed along the mold surface, and it can be applied to the mold surface of the finish forging die. The effect of reducing the acting surface pressure can be obtained, the effect of reducing the load burden on the lower mold and the upper mold can be obtained, and the durability can be improved.
【００２５】第２発明の位相ズレを修正する歯車鍛造方
法（以下、第２発明と称す）を適用できる歯車として
は、外歯歯車、内歯歯車などである。第２発明の第１鍛
造工程および第２鍛造工程で用いられる荒地鍛造型およ
び第仕上げ鍛造型は、歯車の軸心線に対し所定の抜き勾
配に形成された型面をもつこと以外、前記第１発明の第
１鍛造工程および第２鍛造工程で用いられる荒地鍛造型
および仕上げ鍛造型と同じである。前記型面の抜き勾配
は、歯車の軸心線に対し約０．３度〜約０．５度であ
る。Gears to which the gear forging method for correcting a phase shift according to the second invention (hereinafter referred to as the second invention) can be applied include external gears and internal gears. The rough land forging die and the finishing forging die used in the first forging step and the second forging step of the second invention have a mold surface formed at a predetermined draft with respect to the axis of the gear. It is the same as the rough land forging die and the finish forging die used in the first forging step and the second forging step of the first invention. The draft of the mold surface is about 0.3 degrees to about 0.5 degrees with respect to the axis of the gear.
【００２６】第２発明によると、第１鍛造工程では、歯
車の原形形状で歯車の軸心線に対し所定の抜き勾配に形
成された型面をもつ荒地鍛造型を用い、所定半径で軸方
向に厚い歯形環状頭部と、歯形環状頭部に連設され歯形
環状頭部の厚さより薄い厚さの環状首部とをもつ中間鍛
造品を粗材から鍛造する。鍛造された中間鍛造品の歯形
環状頭部の周方向には、形成途中の歯および歯溝を周方
向に交互に、かつ等間隔に形成され、しかも、各歯およ
び各歯溝が歯車の軸心線に対し所定の抜き勾配に形成さ
れている。According to the second invention, in the first forging step, a rough land forging die having a mold surface having a predetermined draft angle with respect to the axis of the gear in the original shape of the gear is used, and a predetermined radius is used in the axial direction. An intermediate forging having a thicker toothed head and an annular neck connected to the toothed head and having a thickness smaller than the thickness of the toothed head is forged from a coarse material. In the circumferential direction of the ring-shaped head of the forged intermediate forged product, teeth and tooth grooves being formed are alternately formed at equal intervals in the circumferential direction, and each tooth and each tooth groove are formed by a gear shaft. A predetermined draft is formed with respect to the core wire.
【００２７】前記第１鍛造工程に引き続き施される第２
鍛造工程では、仕上げ鍛造型歯車形状で歯車の軸心線に
対し所定の抜き勾配に形成された型面と、環状首部の軸
方向の両面の少なくとも一方に対向する環状自由空間と
をもつ仕上げ鍛造型を用いるため、トランスファー搬送
装置で前記中間鍛造品を仕上げ鍛造型にまで搬送して所
定の基準位置にセットする場合、仮に、トランスファー
搬送装置の前記遊びによる周方向の位相差が生じていた
としても、中間鍛造品は、その抜き勾配が仕上げ鍛造型
の抜き勾配に沿って案内され、かつ位相差が修正され位
相ずれがない正規のセット基準位置に確実に納まる。[0027] The second forging performed following the first forging step.
In the forging process, a finish forging having a die surface in a shape of a finish forging die gear formed at a predetermined draft with respect to the axis of the gear and an annular free space opposed to at least one of both axial surfaces of the annular neck portion. In order to use a mold, when the intermediate forged product is transported to a finish forging die by a transfer transport device and set at a predetermined reference position, assuming that a circumferential phase difference due to the play of the transfer transport device has occurred. However, the draft of the intermediate forged product is guided along the draft of the finish forging die, and the phase difference is corrected so that the intermediate forged product can be surely set in the regular set reference position without any phase shift.
【００２８】従って、第２発明の第２鍛造工程時には、
前記第１発明の第２鍛造工程時と同じ作用が得られる
他、中間鍛造品あるいは仕上げ鍛造型は、位相ずれによ
るかじりの発生がなく、第２鍛造後の鍛造品は所定の品
質を保持できる。第２発明を用いて製造された歯車は、
歯車の軸心線に対し所定の抜き勾配形状に形成された傾
斜歯面をもつ。Therefore, at the time of the second forging step of the second invention,
In addition to obtaining the same action as in the second forging step of the first invention, the intermediate forged product or the finish forging die does not generate galling due to phase shift, and the forged product after the second forging can maintain a predetermined quality. . The gear manufactured using the second invention is:
It has an inclined tooth surface formed in a predetermined draft shape with respect to the axis of the gear.
【００２９】このため、傾斜歯面を歯車の軸心線に対し
平行な形状にサイジング処理することにより平歯車とし
て用いることや、前記勾配とは逆の勾配に形成すること
もできる。For this reason, the inclined tooth surface can be sized to a shape parallel to the axis of the gear to be used as a spur gear, or can be formed to have a gradient opposite to the above gradient.
【００３０】[0030]
【実施例】（実施例１）第１発明の鍛造方法を平歯車を
製造する場合に適用し、実施例１として図１〜図１９を
用いて説明する。実施例１の鍛造方法は、第１鍛造工程
により図１に示す粗材９ａを荒地鍛造し、中間形状歯形
部９５ｂを備えた中間鍛造品９ｂを得た後、第２鍛造工
程により前記中間鍛造品９ｂを仕上げ鍛造し、歯形部９
５を備えた平歯車９Ａを得るものである。(Embodiment 1) The forging method of the first invention is applied to the case of manufacturing a spur gear, and Embodiment 1 will be described with reference to FIGS. In the forging method according to the first embodiment, the rough material 9a shown in FIG. 1 is forged in rough ground by a first forging process to obtain an intermediate forged product 9b having an intermediate profile 95b, and then the intermediate forging is performed by a second forging process. The product 9b is finish forged and the tooth profile 9
5 is obtained.
【００３１】次に、第１鍛造工程で用いられる荒地鍛造
型１と、第２鍛造工程で用いられる仕上げ鍛造型５を説
明する。図２に示す荒地鍛造型１は、下型として固定位
置に図略の保持部材に保持された歯形ダイス２と、上型
として歯形ダイス２に接近および遠ざかる方向に、往復
移動（図２の矢印Ｙ１、Ｙ２参照）可能に図略の駆動装
置（片打ち機構のプレス）および可動部材に連動保持さ
れたパンチ３と、歯形ダイス２の中心に設置された円柱
状のマンドレル４０と、マンドレル４０の外周側を上下
方向に往復移動可能に装着された円筒状のスリーブエジ
ェクター４１とよりなる。Next, the rough forging die 1 used in the first forging step and the finish forging die 5 used in the second forging step will be described. The rough land forging die 1 shown in FIG. 2 reciprocates (arrows in FIG. 2) in a direction approaching and moving away from the tooth die 2 as an upper die and a tooth die 2 held by a holding member (not shown) at a fixed position. Y1 and Y2) a drive device (press of a one-side punching mechanism), which is not shown, and a punch 3 which is interlocked and held by a movable member, a cylindrical mandrel 40 installed at the center of the tooth shape die 2, and a mandrel 40. It comprises a cylindrical sleeve ejector 41 mounted on the outer peripheral side so as to be able to reciprocate up and down.
【００３２】歯形ダイス２は、スリーブエジェクター４
１を介してマンドレル４０に挿通される中央孔２０と、
中央孔２０と同心円状でそれぞれ半径外方向Ｒ２に順
に、環状押圧部２１と、環状凹部２３と、歯形形成部２
５とを備え、これらによりキャビィティ空間２６を形成
している。環状押圧部２１は、環状凹部２３より内周側
に形成された環状の突部形状のもので、環状凹部２３の
内底面２４より約４ｍｍ高い位置ｈ１（図６参照）に突
出する巾ｗ１が約１３ｍｍの平坦な頂面２２をもつ。な
お、前記値および以下に示す値は、限定されるものでは
なく目的に応じて種々設定できる。The tooth shape die 2 is provided with a sleeve ejector 4
1, a central hole 20 inserted through the mandrel 40,
The annular pressing portion 21, the annular concave portion 23, and the tooth forming portion 2 are concentric with the central hole 20 in the radial outer direction R2, respectively.
5 to form a cavity space 26. The annular pressing portion 21 has a shape of an annular protrusion formed on the inner peripheral side of the annular concave portion 23, and has a width w1 projecting to a position h1 (see FIG. 6) approximately 4 mm higher than the inner bottom surface 24 of the annular concave portion 23. It has a flat top surface 22 of about 13 mm. In addition, the said value and the value shown below are not limited, but can be set variously according to the purpose.
【００３３】環状凹部２３は、環状押圧部２１よりも半
径外方向Ｒ２側に形成され、平坦な内底面２４をもつ。
歯形形成部２５は、前記内底面２４の外周側から上方に
向かって延びるとともに、周方向Ｓ（図７参照）に等間
隔で交互に形成された歯形成型面２５０と歯溝形成型面
２５１とをもつ。The annular concave portion 23 is formed closer to the radially outward direction R2 than the annular pressing portion 21 and has a flat inner bottom surface 24.
The tooth profile forming portion 25 extends upward from the outer peripheral side of the inner bottom surface 24, and is alternately formed at regular intervals in the circumferential direction S (see FIG. 7) and the tooth groove forming surface 251. With
【００３４】パンチ３は、筒状体であり、マンドレル４
０と所定の間隔を保持する内径でマンドレル４０に挿通
される中央孔３０と、中央孔３０と同心円状でそれぞれ
半径外方向Ｒ２に順に形成された環状押圧部３１と、環
状空間部３（断面略Ｌ字状の切り欠け部）３３と、歯形
形成部３５とよりなる。このパンチ３は、前記図略の駆
動装置によって歯形ダイス２のキャビィティ空間２６へ
の進入作動および後退作動を制御できる。The punch 3 is a cylindrical body and has a mandrel 4
0, a central hole 30 inserted through the mandrel 40 with an inner diameter that maintains a predetermined interval, an annular pressing portion 31 formed concentrically with the central hole 30 and formed sequentially in a radially outward direction R2, and an annular space portion 3 (cross section). A substantially L-shaped cutout portion) 33 and a tooth profile forming portion 35 are provided. The punch 3 can control the operation of entering and retracting the tooth-shaped die 2 into the cavity 26 by the drive device (not shown).
【００３５】環状押圧部３１は、環状空間部３３より内
周側に形成された環状の突部形状のもので、環状空間部
３３の平坦面３４より約５ｍｍ低い位置ｈ２（図６参
照）に突出する巾ｗ２が約１０ｍｍの平坦面３２をも
つ。環状空間部３３は、環状押圧部３１の半径外方向Ｒ
２側で歯形ダイス２の環状凹部２３と対向する。The annular pressing portion 31 has a shape of an annular protrusion formed on the inner peripheral side of the annular space portion 33, and is located at a position h2 (see FIG. 6) about 5 mm lower than the flat surface 34 of the annular space portion 33. The protruding width w2 has a flat surface 32 of about 10 mm. The annular space portion 33 is formed in a radial outer direction R of the annular pressing portion 31.
The second side faces the annular recess 23 of the toothed die 2.
【００３６】歯形形成部３５は、環状空間部３３の外周
側で下方向に延びるとともに、前記図７に示す歯形ダイ
ス２の歯形形成部２５の歯形成型面２５０および歯溝形
成型面２５１に、軸心線Ｐ（図２参照）方向に摺動可能
に出し入れできる歯溝（図示せず）および歯（図示せ
ず）を周方向Ｓに等間隔で交互に形成されている。この
歯形形成部３５は、パンチ３の往復移動に伴い歯形ダイ
ス２の歯形形成部２５を案内とし、軸心線Ｐ方向に摺動
でき、かつ歯形ダイス２のキャビィティ空間２６に進入
およびキャビィティ空間２６から後退できるように形成
されている。The tooth forming portion 35 extends downward on the outer peripheral side of the annular space portion 33 and is formed on the tooth forming surface 250 and the tooth groove forming surface 251 of the tooth forming portion 25 of the tooth die 2 shown in FIG. , Tooth grooves (not shown) and teeth (not shown) which can slide in and out in the direction of the axis P (see FIG. 2) are alternately formed at regular intervals in the circumferential direction S. The tooth profile forming portion 35 guides the tooth profile forming portion 25 of the tooth shape die 2 as the punch 3 reciprocates, can slide in the direction of the axis P, and enters the cavity space 26 of the tooth shape die 2 and the cavity space 26. It is formed so that it can recede from.
【００３７】マンドレル４０は、図略の保持部材により
荒地鍛造型１の中心部の固定位置に保持されている。ス
リーブエジェクター４１は、筒状体よりなりマンドレル
４０を案内として図略の駆動装置によって、上下方向に
往復移動可能に装着されている。図１０に示す仕上げ鍛
造型５は、固定位置に図略の保持部材に保持された歯形
ダイス６と、歯形ダイス６に接近および遠ざかる方向
に、往復移動（図１０の矢印Ｙ１、Ｙ２参照）可能に図
略の駆動装置および可動部材に連動保持されたパンチ７
と、中心に設置された円柱状のマンドレル８０と、マン
ドレル８０の外周側を上下方向に往復移動可能に装着さ
れた円筒状のスリーブエジェクター８１とよりなる。The mandrel 40 is held at a fixed position at the center of the wasteland forging die 1 by a holding member (not shown). The sleeve ejector 41 is made of a cylindrical body, and is mounted so as to reciprocate up and down by a driving device (not shown) with the mandrel 40 as a guide. The finish forging die 5 shown in FIG. 10 can reciprocate (see arrows Y1 and Y2 in FIG. 10) in a direction in which the tooth shape die 6 is held by a holding member (not shown) at a fixed position and approach and move away from the tooth shape die 6. , A driving device and a punch 7 interlocked with a movable member
And a cylindrical mandrel 80 installed at the center, and a cylindrical sleeve ejector 81 mounted so as to reciprocate up and down on the outer peripheral side of the mandrel 80.
【００３８】歯形ダイス６は、スリーブエジェクター８
１を介してマンドレル８０に挿通される中央孔６０と、
中央孔６０と同心円状でそれぞれ半径外方向Ｒ２に順
に、環状突部６１と、環状凹部６３と、歯形形成部６５
とを備えたキャビィティ空間６６を形成している。環状
凹部６３は、環状突部６１と歯形形成部６５との間の幅
ｗ３（図１３参照）が約１０ｍｍで、環状突部６１の平
坦面６２より軸心線Ｐ方向に若干窪んだ形状に設定され
た内底面である押圧面６４をもつ。押圧面６４の窪み量
Ｋｕ（図１３参照）は約０．５ｍｍである。The tooth die 6 is provided with a sleeve ejector 8
1, a central hole 60 inserted through the mandrel 80,
The annular projection 61, the annular recess 63, and the tooth forming portion 65 are arranged in the radial outer direction R <b> 2 concentrically with the center hole 60.
And a cavity space 66 having the following. The annular recess 63 has a width w3 (see FIG. 13) between the annular projection 61 and the tooth profile forming portion 65 of about 10 mm, and is slightly recessed in the direction of the axis P from the flat surface 62 of the annular projection 61. It has a pressing surface 64 which is a set inner bottom surface. The depression Ku of the pressing surface 64 (see FIG. 13) is about 0.5 mm.
【００３９】歯形形成部６５は、押圧面６４外周側から
上方に向かって延びるとともに、周方向Ｓ（図１８参
照）に等間隔で交互に形成された歯形成型面６５０と歯
溝形成型面６５１とをもつ。パンチ７は、筒状体であ
り、マンドレル８０と所定の間隔を保持する内径でマン
ドレル８０に挿通される中央孔７０と、中央孔７０と同
心円状で半径外方向Ｒ２に順に形成された環状突部７１
と、環状凹部７３と、歯形形成部７５とよりなる。この
パンチ７は、前記図略の駆動装置によって歯形ダイス６
のキャビィティ空間６６への進入作動および後退作動を
制御できる。The tooth profile forming portion 65 extends upward from the outer peripheral side of the pressing surface 64, and is formed alternately at regular intervals in the circumferential direction S (see FIG. 18). 651. The punch 7 is a cylindrical body, and has a central hole 70 inserted through the mandrel 80 with an inner diameter that keeps a predetermined distance from the mandrel 80, and an annular protrusion formed concentrically with the central hole 70 and formed in the radial outer direction R2 in order. Part 71
, An annular concave portion 73, and a tooth profile forming portion 75. The punch 7 is driven by the driving device (not shown) to form the toothed die 6.
Of the vehicle into and from the cavity space 66 can be controlled.
【００４０】環状凹部７３は、環状突部７１の外周側に
形成され、かつ環状突部７１の平坦面７２から軸心線Ｐ
方向に若干窪んだ形状に設定され幅ｗ４（図１３参照）
が約１０ｍｍの押圧面７４をもつ。押圧面７４の窪み量
Ｋｄは約１．０ｍｍである。歯形形成部７５は、環状凹
部７３の外周側で下方向に延びるとともに、前記図１８
に示す歯形ダイス６の歯形形成部６５の歯形成型面６５
０および歯溝形成型面６５１に、軸心線Ｐ方向に摺動可
能に出し入れできる歯溝（図示せず）および歯（図示せ
ず）を周方向Ｓに等間隔で交互に形成されている。The annular recess 73 is formed on the outer peripheral side of the annular projection 71 and extends from the flat surface 72 of the annular projection 71 along the axis P.
The width w4 is set to be slightly depressed in the direction (see FIG. 13).
Have a pressing surface 74 of about 10 mm. The depression amount Kd of the pressing surface 74 is about 1.0 mm. The tooth profile forming portion 75 extends downward on the outer peripheral side of the annular concave portion 73 and has the shape shown in FIG.
Tooth forming surface 65 of the tooth forming part 65 of the tooth die 6 shown in FIG.
The tooth grooves (not shown) and the teeth (not shown) that can slide in and out in the axial center line P direction are alternately formed at equal intervals in the circumferential direction S on the 0 and the tooth groove forming mold surface 651. .
【００４１】この歯形形成部７５は、パンチ７の往復移
動に伴い歯形ダイス６の歯形形成部６５を案内として、
軸心線Ｐ（図１８参照）方向に摺動でき、かつ歯形ダイ
ス６のキャビィティ空間６６に進入およびキャビィティ
空間６６から後退できるように形成されている。なお、
パンチ７に形成された押圧面７４の窪み量Ｋｄと、前記
歯形ダイス６に形成された押圧面６４の窪み量Ｋｕとの
関係は、Ｋｄ＞Ｋｕに設定される。The tooth profile forming portion 75 guides the tooth profile forming portion 65 of the tooth die 6 as the punch 7 reciprocates.
It is formed so that it can slide in the direction of the axis P (see FIG. 18) and can enter and retract from the cavity space 66 of the toothed die 6. In addition,
The relationship between the depression amount Kd of the pressing surface 74 formed on the punch 7 and the depression amount Ku of the pressing surface 64 formed on the tooth shape die 6 is set as Kd> Ku.
【００４２】すなわち、実施例１の場合では、歯形ダイ
ス６が固定され、パンチ７が歯形ダイス６に対し可動す
る方式（いわゆる片打ち機構のプレスを用いてパンチ７
を往復移動する方式）であるため、予め、歯形ダイス６
の基準位置にセットした中間鍛造品９ｂに対し、パンチ
７による流動拘束量＞歯形ダイス６による流動拘束量と
の関係に設定することによって、中間鍛造品９ｂの加圧
時にパンチ７の面圧と歯形ダイス６の面圧とがほぼ均一
になるように配慮されている。That is, in the case of the first embodiment, a method in which the tooth shape die 6 is fixed and the punch 7 is movable with respect to the tooth shape die 6 (the punch 7
Of the tooth shape die 6 in advance.
For the intermediate forging 9b set at the reference position, the relationship between the flow constraint by the punch 7 and the flow constraint by the toothed die 6 is set so that the surface pressure of the punch 7 when the intermediate forging 9b is pressurized. Care is taken to make the surface pressure of the tooth-shaped die 6 substantially uniform.
【００４３】マンドレル８０は、図略の保持部材により
仕上げ鍛造型５の中心部の固定位置に保持されている。
スリーブエジェクター８１は、筒状体よりなりマンドレ
ル８０を案内として図略の駆動装置によって、上下方向
に往復移動可能に装着されている。また、別途用意され
た粗材９ａは、図１に示されるように、予め、予備荒地
鍛造されたもので、軸心線Ｐ方向に貫通する孔９０をも
つ筒部９１と、筒部９１より半径外方向Ｒ２に突出する
径大部９２とよりなる。前記筒部９１は、それぞれ所定
の値に設定された上部外径Ｄ１、下部外径Ｄ２、内径
ｄ、軸心線Ｐ方向の長さＬを備え、径大部９２は外径Ｄ
３、厚さｔを備えている。The mandrel 80 is held at a fixed position at the center of the finish forging die 5 by a holding member (not shown).
The sleeve ejector 81 is made of a cylindrical body, and is mounted so as to reciprocate up and down by a driving device (not shown) with the mandrel 80 as a guide. As shown in FIG. 1, the separately prepared coarse material 9 a is preliminarily rough-forged and forged, and has a cylindrical portion 91 having a hole 90 penetrating in the direction of the axis P, and a cylindrical portion 91. The large-diameter portion 92 protrudes in the radially outward direction R2. The cylindrical portion 91 has an upper outer diameter D1, a lower outer diameter D2, an inner diameter d, and a length L in the direction of the axis P set at predetermined values, respectively.
3. It has a thickness t.
【００４４】以下に、実施例１の鍛造方法における第１
鍛造工程、第２鍛造工程を順に施す場合を説明する。 （第１鍛造工程）第１鍛造工程では、型開状態にある荒
地鍛造型１の歯形ダイス２のキャビィティ２６に粗材９
ａがセットされる。Hereinafter, the first forging method of the first embodiment will be described.
A case where the forging step and the second forging step are sequentially performed will be described. (First Forging Step) In the first forging step, the rough material 9 is added to the cavities 26 of the tooth dies 2 of the rough land forging die 1 in the mold open state.
a is set.
【００４５】すなわち、粗材９ａは、図２に示されるよ
うに、筒部９１の孔９０が荒地鍛造型２のマンドレル４
０に挿通され、径大部９２の下面（一端面）９２０が歯
形ダイス２の環状押圧部２１に載置される。すると、筒
部９１の下面（一端面）９１０とスリーブエジェクター
４１の先端面４１１とは、若干の間隔を隔てて対向し、
密閉され周方向Ｓに１巡する環状の第１密閉自由空間ａ
１が形成される。That is, as shown in FIG. 2, the coarse material 9 a is formed such that the hole 90 of the cylindrical portion 91 has the mandrel 4 of the rough land forging die 2.
The lower surface (one end surface) 920 of the large-diameter portion 92 is placed on the annular pressing portion 21 of the toothed die 2. Then, the lower surface (one end surface) 910 of the cylindrical portion 91 and the distal end surface 411 of the sleeve ejector 41 face each other with a slight gap therebetween,
An annular first closed free space a that is closed and makes a round in the circumferential direction S
1 is formed.
【００４６】そして、パンチ３を歯形ダイス２に接近す
る方向に往移動（図１矢印Ｙ１参照）させる。なお、歯
形ダイス２とともに軸方向Ｐに所定の加圧力で粗材９ａ
の径大部９２を加圧する過程途中の型閉じ状態（図３参
照）にある歯形ダイス２およびパンチ３との位置関係に
おいて、粗材９ａの径大部９２の外周側領域を環状に包
む第２密閉自由空間ａ２が形成される。Then, the punch 3 is moved forward in the direction approaching the toothed die 2 (see arrow Y1 in FIG. 1). Note that the coarse material 9a is formed together with the tooth shape die 2 in the axial direction P with a predetermined pressing force.
In the positional relationship between the toothed die 2 and the punch 3 in the mold closed state (see FIG. 3) in the process of pressing the large-diameter portion 92, the outer peripheral region of the large-diameter portion 92 of the coarse material 9a is annularly wrapped. Two closed free spaces a2 are formed.
【００４７】この第２密閉自由空間ａ２は、塑性変形対
象領域としての径大部９２（図３参照）を張出し、歯形
環状頭部９３（図５参照）とするための張出し代（張出
し量）に相当する形状および容積を備える。ついで、粗
材９ａ（図３、図７参照）は、径大部９２の下面９１０
が歯形ダイス２の環状押圧部２１に加圧され、上面９１
１がパンチ３の環状押圧部３１に加圧されて中間形状歯
形部９５ｂ１をもつ途中形状９ｂ１（図４、図８参照）
をへて中間鍛造品９ｂ（図５、図９参照）として荒地鍛
造される。The second sealed free space a2 projects a large-diameter portion 92 (see FIG. 3) as a region to be plastically deformed, and a protrusion allowance (projection amount) for forming a tooth-shaped annular head 93 (see FIG. 5). With a shape and volume corresponding to Next, the coarse material 9a (see FIGS. 3 and 7) is attached to the lower surface 910 of the large-diameter portion 92.
Is pressed against the annular pressing portion 21 of the toothed die 2 and the upper surface 91 is pressed.
1 is pressed against the annular pressing portion 31 of the punch 3 and has an intermediate shape 9b1 having an intermediate tooth portion 95b1 (see FIGS. 4 and 8).
And forged in rough terrain as an intermediate forged product 9b (see FIGS. 5 and 9).
【００４８】ここで、前記歯形ダイス２とパンチ３との
加圧による粗材９ａから途中形状９ｂ１に塑性変形する
場合および途中形状９ｂ１から中間鍛造品９ｂに塑性変
形する場合の材料の流れを示す。粗材９ａの塑性変形時
には、まず図４に示されるように、歯形ダイス２の環状
押圧部２１とパンチ３の環状押圧部３１とで径大部９２
が挟持され環状首部９４となる領域で垂直分水嶺Ｏ１
（図４参照）を境界として水平方向に二分し、半径内方
向Ｒ１と半径外方向Ｒ２に向かう材料の分流と、筒部９
１領域で水平分水嶺Ｏ２をを境界として垂直方向に二分
し、矢印Ｙ１とＹ２方向に向かう材料の分流と、歯形環
状頭部９３となる領域で水平分水嶺Ｏ２を境界として垂
直方向に二分し、矢印Ｙ１とＹ２方向に向かう材料の分
流とが生成され、前記第１密閉自由空間ａ、第２密閉自
由空間ａ１の順に材料が充填される。Here, the flow of material when plastic deformation is performed from the rough material 9a to the intermediate shape 9b1 by pressurization of the tooth-shaped die 2 and the punch 3 and when plastic deformation is performed from the intermediate shape 9b1 to the intermediate forged product 9b will be described. . At the time of plastic deformation of the coarse material 9a, first, as shown in FIG. 4, the annular pressing portion 21 of the toothed die 2 and the annular pressing portion 31 of the punch 3 form a large
In the area where the annular neck 94 is sandwiched by the vertical watershed O1
(See FIG. 4) as a boundary, and divides the material in the horizontal direction into the radially inward direction R1 and the radially outward direction R2.
In one region, the horizontal watershed O2 is vertically divided into two parts, and the material is diverted in the directions indicated by arrows Y1 and Y2. The flow of the material in the Y1 and Y2 directions is generated, and the material is filled in the order of the first sealed free space a and the second sealed free space a1.
【００４９】すなわち、前記第１密閉自由空間ａ１に材
料が充填された後は、図５に示されるように、歯形環状
頭部９３となる領域で矢印Ｙ１、Ｙ２方向に向かう材料
の分流と、筒部９１領域で矢印Ｙ２方向に向かう分流と
なり、かつ第２密閉自由空間ａ２に材料が充填されるま
での間、自由空間ｂへの材料の分流が継続される。この
ため、歯形ダイス２とパンチ３との加圧により、径大部
９２が塑性変形し、環状首部９４が形成された後、歯形
環状頭部９３の形成を終えるまでの間、材料にかかる加
工力の一部を前記自由空間ｂに逃がす状態を継続でき、
第１密閉自由空間ａ１、第２密閉自由空間ａ２へスムー
ズに材料の充填ができる。That is, after the first closed free space a1 is filled with the material, as shown in FIG. 5, the material flows in the region of the toothed annular head 93 in the directions of the arrows Y1 and Y2. In the region of the cylindrical portion 91, the flow is divided in the direction of the arrow Y2, and the flow of the material to the free space b is continued until the second sealed free space a2 is filled with the material. For this reason, after the large-diameter portion 92 is plastically deformed by the pressurization of the tooth-shaped die 2 and the punch 3 and the annular neck portion 94 is formed, the processing on the material is performed until the formation of the tooth-shaped annular head 93 is completed. A state where a part of the force is released to the free space b can be continued,
The first sealed free space a1 and the second sealed free space a2 can be smoothly filled with a material.
【００５０】従って、第１鍛造工程で用いる加圧時の歯
形ダイス２およびパンチ３は、比較的低い加圧力で目的
とする中間鍛造品９ｂを荒地鍛造できるため、加圧時に
受ける反力を必要以上に増すことなく、耐久性を向上し
得る。このようにして得られた中間鍛造品９ｂ（図１参
照）は、軸心線Ｐ方向に貫通する孔９０をもつ筒部９１
と、軸方向Ｐに所定の厚さｔ１を備えた歯形環状頭部９
３と、歯形環状頭部９３に連設されその厚さｔ１より薄
い厚さｔ２の環状首部９４とよりなり、かつ歯形環状頭
部９３と環状首部９４は、互いに隣り合う位置に形成さ
れる。なお、歯形環状頭部９３の中間形状歯形部９５ｂ
は、平面形状において、図１７に示す平歯車９Ａの歯形
部９５の全歯たけＬ４よりも、ほぼ歯末のたけ分、短い
ほぼ歯元のたけＬ３（図１６参照）を備えた形状であ
る。Therefore, the tooth profile die 2 and the punch 3 at the time of pressurization used in the first forging step can forge the target intermediate forged product 9b with a relatively low pressing force, so that the reaction force received at the time of pressurization is required. The durability can be improved without increasing the above. The intermediate forged product 9b (see FIG. 1) obtained in this manner has a cylindrical portion 91 having a hole 90 penetrating in the direction of the axis P.
And a toothed annular head 9 having a predetermined thickness t1 in the axial direction P.
3 and an annular neck 94 connected to the tooth-shaped annular head 93 and having a thickness t2 smaller than the thickness t1. The tooth-shaped annular head 93 and the annular neck 94 are formed at positions adjacent to each other. In addition, the intermediate-shaped tooth profile part 95b of the tooth-shaped annular head 93
Is a shape having, in a planar shape, an approximate tooth root length L3 (see FIG. 16) that is substantially shorter than the full tooth height L4 of the tooth profile portion 95 of the spur gear 9A shown in FIG. .
【００５１】一方、パンチ３を歯形ダイス２から遠ざか
る方向に復移動（矢印Ｙ２参照）して荒地鍛造型１を型
開状態（図６参照）とした後、スリーブエジェクター４
１を同方向に移動させて歯形ダイス２のキャビィティ空
間２６から離脱した位置に中間鍛造品９ｂを持ち上げ
る。 （第２鍛造工程）前記中間鍛造品９ｂは、図略のトラン
スファー搬送装置により搬送され、予め、型開状態とさ
れた仕上げ鍛造型５（図１０参照）の歯形ダイス６のキ
ャビィティ６６にセットされ、かつ第２鍛造工程に移行
する。On the other hand, the punch 3 is moved backward in the direction away from the toothed die 2 (see arrow Y2) to bring the wasteland forging die 1 into the mold open state (see FIG. 6).
1 is moved in the same direction to lift the intermediate forged product 9b to a position separated from the cavity space 26 of the toothed die 2. (Second Forging Step) The intermediate forged product 9b is transported by a transfer transport device (not shown), and is set in advance in the cavities 66 of the tooth dies 6 of the finished forging die 5 (see FIG. 10) which has been opened. Then, the process proceeds to the second forging step.
【００５２】第２鍛造工程では、中間鍛造品９ｂは、筒
部９１の孔９０がマンドレル８０に挿通され、歯形環状
頭部９３の下面９３０（図１０参照）が歯形ダイス６の
押圧面６４に載置され、筒部９１の下面９１０がスリー
ブエジェクター８１の先端面８１１に載置され、歯形ダ
イス６の環状突部６１の平坦面６２と、環状首部９４の
下面９４０とが若干の間隔を隔てて対向し、密閉された
環状の第１密閉自由空間ａ３が形成される。In the second forging step, the intermediate forged product 9 b is inserted into the mandrel 80 through the hole 90 of the cylindrical portion 91, and the lower surface 930 (see FIG. 10) of the toothed annular head 93 is brought into contact with the pressing surface 64 of the toothed die 6. The lower surface 910 of the cylindrical portion 91 is mounted on the distal end surface 811 of the sleeve ejector 81, and the flat surface 62 of the annular protrusion 61 of the toothed die 6 and the lower surface 940 of the annular neck portion 94 are slightly spaced from each other. And a closed first annular closed space a3 is formed.
【００５３】この状態でパンチ７を歯形ダイス６に接近
する方向に往移動（図１矢印Ｙ１参照）させる。する
と、歯形ダイス６とともに軸方向Ｐに所定の加圧力で中
間鍛造品９ｂの歯形環状頭部９３を加圧する過程途中の
型閉じ状態（図１１参照）にある歯形ダイス６およびパ
ンチ７との位置関係において、中間鍛造品９ｂの歯形環
状頭部９３の外周側領域を環状に包む第２密閉自由空間
ａ４と、パンチ７の環状突部７１の平坦面７２と環状首
部９４の上面９４１とが若干の間隔を隔てて対向し、密
閉された環状の第３密閉自由空間ａ５が形成される。In this state, the punch 7 is moved forward in the direction approaching the toothed die 6 (see arrow Y1 in FIG. 1). Then, the position of the tooth shape die 6 and the punch 7 in the mold closed state (see FIG. 11) in the process of pressing the tooth shape annular head 93 of the intermediate forging 9b with a predetermined pressing force in the axial direction P together with the tooth shape die 6. In the relation, the second sealed free space a4 which annularly surrounds the outer peripheral region of the toothed annular head 93 of the intermediate forged product 9b, the flat surface 72 of the annular projection 71 of the punch 7 and the upper surface 941 of the annular neck 94 are slightly different. A third closed free space a5, which is closed and opposed, is formed.
【００５４】なお、第２密閉自由空間ａ４は、歯形ダイ
ス６とパンチ７とで加圧される中間鍛造品９ｂの歯形環
状頭部９３の塑性変形時の材料により全ての領域が充填
される容積に設定される。また、第１密閉自由空間ａ３
および第３密閉自由空間ａ５は、歯形ダイス６とパンチ
７とで加圧される中間鍛造品９ｂの歯形環状頭部９３の
塑性変形時の材料により充填されない非充填領域が形成
される容積に設定される。さらに第１密閉自由空間ａ
３、第３密閉自由空間ａ５の容積は、予め、第２密閉自
由空間ａ４の容積よりも大きく設定される。The second closed free space a4 has a volume in which all the regions are filled with the material at the time of plastic deformation of the tooth-shaped annular head 93 of the intermediate forging 9b pressed by the tooth-shaped die 6 and the punch 7. Is set to Also, the first closed free space a3
The third closed free space a5 is set to a volume in which an unfilled area is formed, which is not filled with the material at the time of plastic deformation of the annular annular head 93 of the intermediate forging 9b pressed by the toothed die 6 and the punch 7. Is done. Furthermore, the first enclosed free space a
3. The volume of the third closed free space a5 is set to be larger than the volume of the second closed free space a4 in advance.
【００５５】ついで、歯形環状頭部９３は、下面９３０
を歯形ダイス６の押圧面６４に加圧され、上面９３１を
パンチ７の押圧面７４に加圧される。このため、中間鍛
造品９ｂは、第２鍛造工程によって、歯形ダイス６の歯
形形成部６５に沿って形成された緻密な歯形部９５を備
えた平歯車９Ａとして仕上げ鍛造される。Next, the tooth-shaped annular head 93 is attached to the lower surface 930.
Is pressed against the pressing surface 64 of the toothed die 6, and the upper surface 931 is pressed against the pressing surface 74 of the punch 7. Therefore, the intermediate forged product 9b is finish forged as a spur gear 9A having a dense tooth profile 95 formed along the tooth profile forming portion 65 of the tooth die 6 in the second forging process.
【００５６】ここで、前記中間鍛造品９ｂ（図１１、図
１８参照）が塑性変形し、平歯車９Ａ（図１２、図１９
参照）として仕上げ鍛造される過程での材料の分流状態
を図１５に示す。前記中間鍛造品９ｂの塑性変形時に
は、歯形ダイス６の押圧面６４とパンチ７の押圧面７４
とで挟持された歯形環状頭部９３領域で垂直分水嶺Ｏ３
を境界として水平方向に二分し、半径内方向Ｒ１と半径
外方向Ｒ２に向かう材料の分流が生成される。Here, the intermediate forged product 9b (see FIGS. 11 and 18) is plastically deformed, and the spur gear 9A (see FIGS. 12 and 19).
FIG. 15 shows a shunt state of the material in the process of finish forging as shown in FIG. During the plastic deformation of the intermediate forged product 9b, the pressing surface 64 of the toothed die 6 and the pressing surface 74 of the punch 7
Vertical watershed O3 in the region of the ring-shaped head 93 sandwiched between
Is halved in the horizontal direction with the boundary as a boundary, and a shunt of the material in the radial inner direction R1 and the radial outer direction R2 is generated.
【００５７】ここで、図１５に示されるように、第１密
閉自由空間ａ３、第３密閉自由空間ａ５は、その容積
を、予め、第２密閉自由空間ａ４の容積よりも大きく設
定されているため、半径外方向Ｒ２に向かう材料の分流
によって第２密閉自由空間ａ４が充填され歯形部９５を
形成し終えるまで、半径内方向Ｒ１に向かう材料の分流
を第１密閉自由空間ａ３、第３密閉自由空間ａ５に進入
し続け、かつ歯形環状頭部９３に作用する加圧力を逃が
すことができ、最終的に材料が殆ど充填されない残留空
間となる。Here, as shown in FIG. 15, the volumes of the first closed free space a3 and the third closed free space a5 are set in advance to be larger than the capacity of the second closed free space a4. Therefore, until the second sealed free space a4 is filled by the shunting of the material in the radially outward direction R2 and the tooth profile portion 95 is formed, the shunting of the material in the radially inward direction R1 is performed by the first sealed free space a3 and the third sealed free space a3. It is possible to continue to enter the free space a5 and to release the pressing force acting on the tooth-shaped annular head 93, and finally, it becomes a residual space in which almost no material is filled.
【００５８】前記半径内方向Ｒ１と半径外方向Ｒ２に向
かう材料は、それぞれ垂直分水嶺Ｏ３から近い位置の第
１密閉自由空間ａ３、第３密閉自由空間ａ５と第２密閉
自由空間ａ４に進入するものであるため、流れの移動間
隔が短く、歯形ダイス６の押圧面６４およびパンチ７の
押圧面７４との摩擦による移動抵抗を低く抑えることが
できる。The material traveling in the radial inner direction R1 and the radial outer direction R2 enters the first closed free space a3, the third closed free space a5, and the second closed free space a4 at positions near the vertical watershed O3, respectively. Therefore, the movement interval of the flow is short, and the movement resistance due to friction between the pressing surface 64 of the toothed die 6 and the pressing surface 74 of the punch 7 can be reduced.
【００５９】このため、歯形ダイス６とパンチ７とによ
る歯形環状頭部９３の加圧力を低くすることができ、前
記低い加圧力であっても、歯形環状頭部９３の塑性変形
に伴う前記半径外方向Ｒ２に向かう材料が第２密閉自由
空間ａ４に確実に充填でき、かつ歯形ダイス６の歯形形
成部６５に沿って加工精度良く緻密に形成された歯形部
９５を備えた平歯車９Ａ（図１、図１３参照）として仕
上げ鍛造できる。For this reason, the pressing force of the tooth-shaped annular head 93 by the tooth-shaped die 6 and the punch 7 can be reduced, and even if the pressing force is low, the radius due to the plastic deformation of the tooth-shaped annular head 93 is reduced. A spur gear 9A having a tooth profile 95 that can reliably fill the second closed free space a4 with the material in the outward direction R2 and that is formed with high precision along the tooth profile forming portion 65 of the tooth die 6 (FIG. 1, see FIG. 13).
【００６０】従って、前記第２鍛造工程での加圧時の歯
形ダイス６およびパンチ７は、比較的低い加圧力で目的
とする平歯車９Ａを仕上げ鍛造できるため、加圧時に受
ける反力を必要以上に増すことなく、耐久性を向上し得
る。さらに、第２鍛造工程では、仕上げ鍛造時の中間鍛
造品９ｂの歯形環状頭部９３の下面９３０および上面９
３１を上下方向から加圧する歯形ダイス６の押圧面６４
およびパンチ７の押圧面７４とを、窪み量Ｋｕ＜窪み量
Ｋｄとし、仕上げ鍛造型５の駆動装置として、廉価な片
打ち機構のプレスを用いて前記仕上げ鍛造することがで
き、設備費を低減できる。Therefore, the tooth profile die 6 and the punch 7 at the time of pressurization in the second forging step can finish and forge the target spur gear 9A with a relatively low pressing force. The durability can be improved without increasing the above. Further, in the second forging step, the lower surface 930 and the upper surface 9 of the tooth-shaped annular head 93 of the intermediate forged product 9b at the time of finish forging are formed.
The pressing surface 64 of the toothed die 6 which presses the upper surface 31 from above and below.
And the pressing surface 74 of the punch 7 is set such that the depression amount Ku <the depression amount Kd, and the finishing forging can be performed by using a low-cost single-punching mechanism press as a driving device of the finishing forging die 5, thereby reducing equipment costs. it can.
【００６１】一方、パンチ７を歯形ダイス６から遠ざか
る方向に復移動（矢印Ｙ２参照）して仕上げ鍛造型５を
型開状態（図１３参照）とした後、スリーブエジェクタ
ー８１を同方向に移動させて歯形ダイス６のキャビィテ
ィ空間６６から離脱した位置に平歯車９Ａを持ち上げ、
引き続き、外部に取り出す。このように実施例１の歯車
鍛造方法によると、第１鍛造工程により粗材９ａを荒地
鍛造し、中間形状歯形部９５ｂを備えた中間鍛造品９ｂ
を得た後、第２鍛造工程により前記中間鍛造品９ｂを仕
上げ鍛造し、歯形部９５を備えた平歯車９Ａを得るもの
であるため、荒地鍛造型１および仕上げ鍛造型５は、粗
材９ａから一気に歯車９Ａを鍛造する場合に比べ、低い
加圧力ですむため、耐久性を向上し得るとともに、無理
なく歯車９Ａを精密鍛造加工でき、製造コスト面で有利
となる。On the other hand, after the punch 7 is moved backward in the direction away from the toothed die 6 (see arrow Y2) to bring the finishing forging die 5 into the mold open state (see FIG. 13), the sleeve ejector 81 is moved in the same direction. The spur gear 9A is lifted to a position separated from the cavity space 66 of the tooth shape die 6,
Then, take it out. As described above, according to the gear forging method of the first embodiment, the rough material 9a is forged in the rough ground by the first forging process, and the intermediate forged product 9b having the intermediate shape tooth profile portion 95b is provided.
Then, the intermediate forged product 9b is subjected to finish forging in a second forging step to obtain a spur gear 9A having a tooth profile portion 95. Therefore, the rough land forging die 1 and the finish forging die 5 are made of coarse material 9a. As compared with the case where the gear 9A is forged at once, the pressing force is lower, so that the durability can be improved and the gear 9A can be precision forged without difficulty, which is advantageous in terms of manufacturing cost.
【００６２】（実施例２）第２発明の位相ズレを修正す
る歯車鍛造方法を平歯車を製造する場合に適用し、実施
例２として図２０〜図２１および実施例１で用いた図２
〜図１９を援用して説明する。なお、実施例１の構成と
同じ部分には同じ符号を付しその説明を省略しする。(Embodiment 2) The gear forging method for correcting a phase shift according to the second invention is applied to the case of manufacturing a spur gear, and FIG.
19 will be described with reference to FIG. The same parts as those in the configuration of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
【００６３】実施例２の位相ズレを修正する歯車鍛造方
法は、第１鍛造工程により図２０に示す粗材９ａを荒地
鍛造し、抜き勾配に形成された傾斜中間歯形部９５ｃを
もつ中間鍛造品９ｃを得た後、第２鍛造工程により前記
中間鍛造品９ｃを仕上げ鍛造し、抜き勾配に形成された
傾斜歯形部９５ｄをもつ平歯車９Ｂとし、この後、平歯
車９Ｂの傾斜歯形部９５ｄにサイジング処理を施こすこ
とによって、前記抜き勾配をストレート形状に形成し実
施例１と同じ歯形部９５を備えた平歯車９Ａとして製造
する。The gear forging method for correcting a phase shift according to the second embodiment is as follows. The forged material 9a shown in FIG. 20 is rough forged in a first forging step, and an intermediate forged product having an inclined intermediate tooth profile portion 95c formed at a draft angle. After obtaining 9c, the intermediate forging 9c is finish-forged in a second forging step to form a spur gear 9B having an inclined tooth profile 95d formed with a draft, and thereafter, to the inclined tooth profile 95d of the spur gear 9B. By performing a sizing process, the draft is formed in a straight shape, and the spur gear 9A having the same tooth profile 95 as in the first embodiment is manufactured.
【００６４】第１鍛造工程で用いる荒地鍛造型１Ａ（図
２参照）は、抜き勾配に形成された歯形ダイス２Ａをも
つこと以外は、実施例１の荒地鍛造型１と同じ構成であ
る。歯形ダイス２Ａは、図１６のＣーＣ線断面位置での
中間鍛造品９ｃとの位相ズレ（軸方向Ｓの位置ズレ）ｅ
を示す図２１のように、抜き勾配として垂直線Ｐ１と平
行な基準線Ｐ１０位置より傾斜角θが約０．５度の傾斜
歯形型面２５３ａ、２５３ａに形成された歯形形成部２
５Ａおよびキャビィティ空間２６ａ（図２参照）を備え
る。The wasteland forging die 1A (see FIG. 2) used in the first forging step has the same configuration as the wasteland forging die 1 of the first embodiment, except that it has a tooth shape die 2A formed with a draft. The tooth profile die 2A has a phase shift (position shift in the axial direction S) e with respect to the intermediate forged product 9c at the cross-sectional position along the line CC in FIG.
21, the tooth profile forming portion 2 formed on the inclined tooth profile surfaces 253a, 253a having an inclination angle θ of about 0.5 degrees from the position of the reference line P10 parallel to the vertical line P1 as a draft angle.
5A and a cavity space 26a (see FIG. 2).
【００６５】第２鍛造工程で用いる仕上げ鍛造型５Ａ
（図６参照）は、抜き勾配に形成された歯形ダイス６Ａ
をもつこと以外は、実施例１の仕上げ鍛造型５と同じ構
成である。歯形ダイス６Ａは、同図２１を援用して示す
ように、前記歯形ダイス２Ａの歯形形成部２５ａの抜き
勾配と同じ構成の傾斜歯形型面６５３ａ、６５３ａを形
成した歯形形成部６５ａおよびキャビィティ空間６６ａ
（図１０参照）を備える。Finish Forging Die 5A Used in Second Forging Step
(See FIG. 6) is a toothed die 6A formed at a draft angle.
It has the same configuration as the finish forging die 5 of Example 1 except that it has As shown in FIG. 21, the tooth shape die 6 </ b> A has a tooth shape forming part 65 a having inclined tooth shape surfaces 653 a, 653 a having the same configuration as the draft of the tooth shape forming part 25 a of the tooth shape die 2 </ b> A, and a cavity space 66 a.
(See FIG. 10).
【００６６】また、前記歯形ダイス２Ａの歯形形成部２
５ａおよび歯形ダイス６Ａの傾斜歯形形成部６５ａは、
いずれも、下方側の開口巾Ｓ１＜上方側の開口巾Ｓ２・
・・との関係にあり、さらに、前記開口巾Ｓ２＞後記す
る中間鍛造品９ｃの傾斜中間歯形部９５ｃの下方側の弦
歯厚さｔ３０・・・との関係に設定される。以下に、実
施例２の位相ズレを修正する歯車鍛造方法における第１
鍛造工程、第２鍛造工程、サイジング工程を順に施す場
合を説明する。Further, the tooth profile forming portion 2 of the tooth profile die 2A
5a and the inclined tooth profile forming portion 65a of the tooth profile die 6A are:
In each case, the lower opening width S1 <the upper opening width S2 ·
The opening width S2> the chordal tooth thickness t30 below the inclined intermediate tooth profile portion 95c of the intermediate forged product 9c described later is set. Hereinafter, a first example of the gear forging method for correcting a phase shift according to the second embodiment will be described.
A case where the forging step, the second forging step, and the sizing step are sequentially performed will be described.
【００６７】（第１鍛造工程）第１鍛造工程では、図２
に示されるように型開状態にある荒地鍛造型１Ａの歯形
ダイス２Ａのキャビィティ２６ａに粗材９ａがセットさ
れる。この後、粗材９ａは、荒地鍛造される過程で、抜
き勾配をもつこと以外は実施例１の途中形状９ｂ１（図
４、図８参照）の形成途中歯形部９５ｂ１とほぼ同じ、
形成途中歯形部９５ｃ１をもつ途中形状９ｃ１をへて、
中間鍛造品９ｃ（図５、図９、図２０参照）として荒地
鍛造される。(First Forging Step) In the first forging step, FIG.
As shown in (1), the rough material 9a is set in the cavity 26a of the tooth shape die 2A of the waste land forging die 1A in the mold open state. Thereafter, the rough material 9a is substantially the same as the halfway tooth profile portion 95b1 of the halfway shape 9b1 (see FIGS. 4 and 8) of the first embodiment except that it has a draft angle in the process of forging rough land.
Through the intermediate shape 9c1 having the tooth profile 95c1 during the formation,
Wasteland forging is performed as an intermediate forged product 9c (see FIGS. 5, 9, and 20).
【００６８】このようにして第１鍛造工程では、荒地鍛
造型１Ａによって粗材９ａから前記中間鍛造品９ｃが荒
地鍛造される。この中間鍛造品９ｃの傾斜中間歯形部９
５ｃは、垂直線Ｐ２方向（図２１参照）の上下位置にお
いて下方側の弦歯厚さｔ３０＜上方側の弦歯厚さｔ３１
・・・との関係であり、同図２１に示される歯形ダイス
６Ａの傾斜歯形形成部６５ａの傾斜歯形型面６５３ａ、
６５３ａの前記抜き勾配を形成する傾斜角θと同じ傾斜
角で傾斜する傾斜歯面９５３ｃ、９５３ｃに形成されて
いる。As described above, in the first forging process, the intermediate forged product 9c is rough-forged from the rough material 9a by the rough-land forging die 1A. The inclined intermediate tooth profile portion 9 of the intermediate forged product 9c
5c is the lower chordal thickness t30 <the upper chordal thickness t31 in the vertical position in the direction of the vertical line P2 (see FIG. 21).
, And the inclined tooth profile surface 653a of the inclined tooth profile forming portion 65a of the tooth profile die 6A shown in FIG.
653a are formed on inclined tooth surfaces 953c, 953c inclined at the same inclination angle as the inclination angle θ forming the draft angle.
【００６９】一方、パンチ３Ａを歯形ダイス２Ａから遠
ざかる方向に復移動（矢印Ｙ２参照）して荒地鍛造型１
Ａを型開状態（図６参照）とした後、スリーブエジェク
ター４１を同方向に移動させて歯形ダイス２Ａのキャビ
ィティ空間２６ａから離脱した位置に中間鍛造品９ｃを
持ち上げる。 （第２鍛造工程）前記中間鍛造品９ｃは、荒地鍛造型１
Ａのスリーブエジェクター４１上から図略のトランスフ
ァー搬送装置によって搬送され、予め、型開状態とされ
た仕上げ鍛造型５Ａ（図１０参照）の歯形ダイス６Ａの
キャビィティ空間６６にセットされる時、仕上げ鍛造型
５Ａの歯形ダイス６Ａの歯形形成部６５ａとの間で周方
向Ｓに位相ずれｅ（図２１参照）が発生した場合であっ
ても、前記歯形形成部６５ａおよび中間鍛造品９ｃの傾
斜中間歯形部９５ｃに予め抜き勾配を備えているため、
位相ずれｅを吸収できるクリアランス（前記上方側の開
口巾Ｓ２ー傾斜中間歯形部９５ｃの下方側の弦歯厚さｔ
３０＝クリアランス）が形成されているため、何ら支障
無く、所定の位置にセットできる。On the other hand, the punch 3A is moved backward (see arrow Y2) in a direction away from the tooth-shaped die 2A, and the wasteland forging die 1 is moved.
After A is in the mold open state (see FIG. 6), the sleeve ejector 41 is moved in the same direction to lift the intermediate forged product 9c to a position separated from the cavity space 26a of the toothed die 2A. (Second Forging Step) The intermediate forged product 9c is a wasteland forging die 1
A is conveyed from above the sleeve ejector 41 of A by a transfer conveying device (not shown) and is set in the cavity space 66 of the tooth shape die 6A of the finish forging die 5A (see FIG. 10) which is previously opened. Even when a phase shift e (see FIG. 21) occurs in the circumferential direction S between the tooth profile forming portion 65a and the tooth profile die 6A of the mold 5A, the inclined intermediate tooth profile of the tooth profile forming portion 65a and the intermediate forged product 9c. Since the portion 95c has a draft angle in advance,
Clearance capable of absorbing the phase shift e (the opening width S2 on the upper side—the chordal thickness t on the lower side of the inclined intermediate tooth profile 95c)
30 = clearance) can be set at a predetermined position without any problem.
【００７０】すなわち、図２１に示す歯形ダイス６Ａの
傾斜歯形形成部６５ａは、上方側の開口巾Ｓ２が下方側
の開口巾Ｓ１よりも広い抜き勾配を備え、かつ中間鍛造
品９ｃの傾斜中間歯形部９５ｃの下方側の弦歯厚さｔ３
０よりも広いため、その傾斜歯形成型面６５３ｃによっ
て傾斜中間歯形部９５ｃの傾斜歯形面９５３ｃを矢印Ｙ
１方向に速やかに案内する。That is, the inclined tooth profile forming portion 65a of the tooth profile die 6A shown in FIG. 21 has a draft angle in which the upper opening width S2 is wider than the lower opening width S1, and the inclined intermediate tooth profile of the intermediate forged product 9c. Chordal tooth thickness t3 below the portion 95c
0, the inclined tooth-forming surface 953c of the inclined intermediate tooth-shaped portion 95c is moved by the arrow Y.
Guide you quickly in one direction.
【００７１】すると、中間鍛造品９ｃは、歯形ダイス６
Ａの傾斜歯形成型面６５３ａに沿って矢印Ｙ１方向に移
動しつつ、前記位相ずれｅを解消する周方向Ｓに移動し
て図１０に示されるように正規の位置にセットされる。
ついで、中間鍛造品９ｃは、仕上げ鍛造型５Ａの型閉状
態（図１１、図１４、図１６、図１８参照）に移行した
後、前記実施例１の中間鍛造品９ｂと同じように、仕上
げ鍛造され（図１２、図１５、図１７、図１９参照）、
前記歯形ダイス６Ａの傾斜歯形形成部６５ａにおける抜
き勾配の傾斜角θ（図２１参照）と同じ傾斜角をもつ歯
すじＰ３の傾斜歯面９５３ｄを形成した傾斜歯形部９５
ｄをもつ平歯車９Ｂ（図２０参照）として仕上げ鍛造さ
れる。Then, the intermediate forged product 9 c is
While moving in the direction of arrow Y1 along the inclined tooth forming mold surface 653a of A, it moves in the circumferential direction S where the phase shift e is eliminated, and is set at a regular position as shown in FIG.
Next, the intermediate forged product 9c is finished in the same manner as the intermediate forged product 9b of the first embodiment, after shifting to the closed state of the finish forging die 5A (see FIGS. 11, 14, 16, and 18). Forged (see FIGS. 12, 15, 17, and 19),
The inclined tooth profile 95 having the inclined tooth surface 953d of the tooth trace P3 having the same inclination angle as the inclination angle θ of the draft at the inclined tooth profile forming portion 65a of the tooth die 6A (see FIG. 21).
The finish forging is performed as a spur gear 9B having d (see FIG. 20).
【００７２】（サイジング工程）第２鍛造工程で得られ
た平歯車９Ｂは、図２３に示されるように、サイジング
型６Ｄのサイジング型面６５ｄにより傾斜歯形部９５ｄ
の傾斜歯面９５３ｄを目的とする弦歯厚さｔ３２のスト
レート（垂直線Ｐ２に対し平行）形状に、サイジング処
理され、図２０に示す平歯車９Ａとして加工される。(Sizing Step) As shown in FIG. 23, the spur gear 9B obtained in the second forging step has an inclined tooth profile 95d formed by the sizing surface 65d of the sizing die 6D.
The inclined tooth surface 953d is sizing-processed into a straight (parallel to the vertical line P2) shape having a target chord tooth thickness t32, and is processed as a spur gear 9A shown in FIG.
【００７３】なお、平歯車９Ｂは、サイジング処理によ
って、前記傾斜歯面９５３ｄ、９５３ｄを逆方向の傾斜
歯面（図示せず）に加工、形成することもできる。この
実施例２の位相ズレを修正する歯車鍛造方法は、実施例
１の場合と同じ効果を得ることができる他、荒地鍛造型
１Ａによって荒地鍛造された中間鍛造品９ｃを図略のト
ランスファー搬送装置により仕上げ鍛造型５Ａに搬送さ
れる時、仕上げ鍛造型５Ａの歯形ダイス６Ａの傾斜歯形
形成部６５ａとの間で周方向Ｓに位相ずれｅが発生した
場合であっても、傾斜歯形形成部６５ａの傾斜歯形型面
６５３ａによって、傾斜中間歯形部９５ｃの傾斜歯面９
５３ｃを、前記位相ずれｅを修正するように案内し、正
規の基準位置にセットできる。The spur gear 9B can be formed by processing the inclined tooth surfaces 953d and 953d into inclined tooth surfaces (not shown) in the opposite direction by sizing. The gear forging method for correcting a phase shift according to the second embodiment can obtain the same effect as that of the first embodiment, and can transfer an intermediate forged product 9c that has been rough forged by the rough land forging die 1A to a transfer conveyance device (not shown). When the phase shift e occurs in the circumferential direction S between the dies 6A of the finishing forging die 5A and the inclined toothing forming portions 65a of the finishing forging die 5A when being transferred to the finishing forging die 5A, the inclined toothing forming portion 65a Of the inclined tooth profile 9 of the inclined intermediate tooth profile 95c by the inclined tooth profile surface 653a of FIG.
The guide 53c is guided to correct the phase shift e, and can be set at a regular reference position.
【００７４】従って、前記実施例２の位相ズレを修正す
る歯車鍛造方法によれば、比較例として図２２に示すよ
うに、歯形ダイス６Ｃの垂直線Ｐ１に対し平行なストレ
ート形状の歯すじをもつ歯形形成部６５ｃと中間鍛造品
９ｂの歯形部９５ｂとに周方向Ｓに位相ずれｅを発生さ
せた状態で矢印Ｙ１方向にセットする仕上げ鍛造時に、
歯形ダイス６Ｃの歯形形成部６５ｃあるいは中間鍛造品
９ｂの歯形部９５ｂにかじりを発生させることや、仕上
げ鍛造後の平歯車の成形精度を低下させることなどの不
具合を解消できる。Therefore, according to the gear forging method for correcting the phase shift of the second embodiment, as shown in FIG. 22, as a comparative example, straight tooth traces parallel to the vertical line P1 of the toothed die 6C are provided. At the time of finish forging, the tooth profile forming portion 65c and the tooth profile portion 95b of the intermediate forged product 9b are set in the arrow Y1 direction with a phase shift e in the circumferential direction S being generated.
Problems such as generation of galling in the tooth profile forming portion 65c of the tooth profile die 6C or the tooth profile portion 95b of the intermediate forged product 9b and reduction of the molding accuracy of the spur gear after finish forging can be solved.
【００７５】[0075]
【発明の効果】（１）第１発明の歯車鍛造方法による
と、第１鍛造工程では、荒地鍛造型によって粗材から中
間鍛造品が鍛造される。この中間鍛造品は、所定半径で
軸方向に厚い歯形環状頭部と、歯形環状頭部に連設され
歯形環状頭部の厚さより薄い厚さの環状首部とが互いに
隣り合う位置に形成することができる。(1) According to the gear forging method of the first invention, in the first forging step, an intermediate forged product is forged from a rough material by a rough land forging die. The intermediate forged product is formed at a position where a tooth-shaped annular head thicker in the axial direction with a predetermined radius and an annular neck portion connected to the tooth-shaped annular head and having a thickness smaller than the thickness of the tooth-shaped annular head are adjacent to each other. Can be.
【００７６】第２鍛造工程では、仕上げ鍛造型によって
中間鍛造品の歯形環状頭部を歯車形状として鍛造する。
この場合、中間鍛造品の歯形環状頭部は、仕上げ鍛造型
によって加圧され塑性変形され材料の流れの一部を、隣
り合う位置の環状頭部に対向する領域に形成された仕上
げ鍛造型の環状自由空間に流入させ得るため、歯形環状
頭部に付与される加圧力の高まることを抑えることがで
き、かつ型面領域に過大な加圧力が作用せず、歯形環状
頭部を小さな荷重で歯車形状とすることができる。In the second forging step, the ring-shaped head of the intermediate forged product is forged in a gear shape using a finish forging die.
In this case, the tooth-shaped annular head of the intermediate forged product is pressurized and plastically deformed by the finishing forging die, and a part of the flow of the material is formed in a region of the finishing forging die formed in a region facing the annular head at an adjacent position. Since it can flow into the annular free space, it is possible to suppress the increase of the pressing force applied to the tooth-shaped annular head, and excessive force does not act on the mold surface area, and the tooth-shaped annular head is applied with a small load. It can be gear shaped.
【００７７】すなわち、仕上げ鍛造型により歯形環状頭
部を加圧することによって、塑性変形した材料は、歯面
に向かう流れと、歯面に近い位置に形成された環状自由
空間に素早くスムーズに流入する流れとを形成するた
め、加圧力が低いものであっても、材料を歯面に沿って
確実に充填でき、かつ精度の良い歯車形状とすることが
できる。 （２）第２発明の位相ズレを修正する歯車鍛造方法は、
歯車の軸心線に対し所定の抜き勾配に形成された型面を
備えた荒地鍛造型および仕上げ鍛造型を用いること、お
よびサイジング工程を用いること以外は、第１発明の歯
車鍛造方法と同じである。That is, by pressurizing the tooth-shaped annular head by the finish forging die, the plastically deformed material flows quickly toward the tooth surface and quickly and smoothly flows into the annular free space formed near the tooth surface. Since the flow is formed, even if the pressing force is low, the material can be reliably filled along the tooth surface and the gear shape can be formed with high accuracy. (2) The gear forging method for correcting a phase shift according to the second invention includes:
The same as the gear forging method of the first invention, except that a rough land forging die and a finish forging die having a mold surface formed at a predetermined draft with respect to the axis of the gear are used, and that a sizing process is used. is there.
【００７８】このため、第２発明の位相ズレを修正する
歯車鍛造方法は、前記第１発明の歯車鍛造方法の場合と
同様、加圧力が低いものであっても、材料を歯面に沿っ
て確実に充填でき、かつ精度の良い歯車形状とすること
ができることの他、抜き勾配に形成された型面をもつ荒
地鍛造型により製造された中間鍛造品がトランスファー
搬送装置により仕上げ鍛造型に搬送された時、仕上げ鍛
造型との間で周方向に位相ずれが発生した場合であって
も、型面の抜き勾配によって中間鍛造品の抜き勾配が位
相ずれを修正するように案内されつつ正規の基準位置に
セットできる。For this reason, the gear forging method for correcting the phase shift according to the second invention is similar to the gear forging method according to the first invention, in that the material is applied along the tooth surface even if the pressing force is low. In addition to being able to reliably fill and have a gear shape with high accuracy, an intermediate forging product manufactured by a rough land forging die having a draft surface formed by a draft is transferred to a finish forging die by a transfer transfer device. At the same time, even if a phase shift occurs in the circumferential direction with the finish forging die, the draft of the intermediate forging product is guided to correct the phase shift by the draft of Can be set in position.
【００７９】従って、中間鍛造品は、第２鍛造工程での
仕上げ鍛造時に、仕上げ鍛造型との間で周方向に位相ず
れを発生した状態でセットされることがなく、仕上げ鍛
造型の歯面あるいは鍛造製品の歯形にかじりが発生する
不具合や、仕上げ鍛造後の鍛造製品の成形精度を悪化さ
せることなどの不具合を解消できる。さらに、前記サイ
ジング工程によって目的とする歯面形状に形成できると
ともに、歯面の成形精度を向上し得る。Therefore, the intermediate forged product is not set in a state in which a phase shift has occurred in the circumferential direction between the intermediate forging and the final forging die in the final forging in the second forging step. Alternatively, it is possible to solve the problems such as the occurrence of galling in the tooth profile of the forged product and the deterioration of the forming accuracy of the forged product after the finish forging. Further, the sizing step can form the target tooth surface shape and improve the tooth surface forming accuracy.
【図１】第１発明の歯車鍛造方法における実施例１の第
１鍛造工程、第２鍛造工程が施され、粗材から中間鍛造
品をへて鍛造製品が製造される過程を示す断面斜視図。FIG. 1 is a sectional perspective view showing a process in which a first forging step and a second forging step of Example 1 in a gear forging method of a first invention are performed, and a forged product is manufactured from a rough material to an intermediate forged product. .
【図２】前記第１発明における実施例１の第１鍛造工程
で用いられる荒地鍛造型に粗材をセットした状態を示す
縦断面図。FIG. 2 is a longitudinal sectional view showing a state in which a rough material is set in a rough land forging die used in a first forging step of Example 1 of the first invention.
【図３】図２の荒地鍛造型により粗材を鍛造する直前の
状態を示す縦断面図。FIG. 3 is a longitudinal sectional view showing a state immediately before forging a rough material by the rough land forging die of FIG. 2;
【図４】図２の荒地鍛造型により粗材を鍛造しつつある
途中状態を示す縦断面図。FIG. 4 is a longitudinal sectional view showing a state in which a rough material is being forged by the rough land forging die of FIG. 2;
【図５】図２の荒地鍛造型により粗材を鍛造し中間鍛造
品が製造された状態を示す縦断面図。FIG. 5 is a longitudinal sectional view showing a state in which a rough material is forged by the rough land forging die of FIG. 2 to produce an intermediate forged product.
【図６】図２の荒地鍛造型から中間鍛造品を外部に取り
出し可能な位置に移動した状態を示す縦断面図。FIG. 6 is a longitudinal sectional view showing a state in which an intermediate forged product has been moved from the wasteland forging die of FIG. 2 to a position where it can be taken out.
【図７】図２における荒地鍛造型の歯形ダイスと粗材と
の関係を示す横断面図。FIG. 7 is a cross-sectional view showing the relationship between the tooth shape die of the rough land forging die and the coarse material in FIG. 2;
【図８】図４における荒地鍛造型の歯形ダイスと粗材と
の関係を示す横断面図。FIG. 8 is a cross-sectional view showing the relationship between the tooth shape die of the rough land forging die and the coarse material in FIG.
【図９】図５における荒地鍛造型の歯形ダイスと中間鍛
造品との関係を示す横断面図。9 is a cross-sectional view showing the relationship between the toothed die of the wasteland forging die and the intermediate forged product in FIG.
【図１０】前記第１発明における実施例１の第２鍛造工
程で用いられる仕上げ鍛造型に中間鍛造品をセットした
状態を示す縦断面図。FIG. 10 is a longitudinal sectional view showing a state where an intermediate forged product is set in a finish forging die used in a second forging step of the first embodiment of the first invention.
【図１１】図１０の仕上げ鍛造型により中間鍛造品を鍛
造する直前の状態を示す縦断面図。FIG. 11 is a longitudinal sectional view showing a state immediately before forging an intermediate forged product by the finish forging die of FIG. 10;
【図１２】図１０の仕上げ鍛造型により鍛造品が製造さ
れた状態を示す縦断面図。FIG. 12 is a longitudinal sectional view showing a state where a forged product is manufactured by the finish forging die of FIG. 10;
【図１３】図１０の仕上げ鍛造型から中間鍛造品を外部
に取り出し可能な位置に移動した状態を示す縦断面図。FIG. 13 is a longitudinal sectional view showing a state where the intermediate forged product has been moved from the finish forging die of FIG. 10 to a position where it can be taken out to the outside.
【図１４】図１１における要部を拡大して示す部分縦断
面図。FIG. 14 is an enlarged partial longitudinal sectional view showing a main part in FIG. 11;
【図１５】図１２における要部を拡大して示す部分縦断
面図。FIG. 15 is an enlarged partial longitudinal sectional view showing a main part in FIG. 12;
【図１６】図１１におけるー矢視線断面。FIG. 16 is a cross-sectional view taken along the arrow in FIG. 11;
【図１７】図１２におけるＢーＢ矢視線断面。FIG. 17 is a sectional view taken along the line BB in FIG. 12;
【図１８】図１０における仕上げ鍛造型の歯形ダイスと
中間鍛造品との関係を示す横断面図。FIG. 18 is a cross-sectional view showing the relationship between the tooth shape die of the finish forging die and the intermediate forged product in FIG.
【図１９】図１２における仕上げ鍛造型の歯形ダイスと
中間鍛造品との関係を示す横断面図。19 is a cross-sectional view showing the relationship between the tooth shape die of the finish forging die and the intermediate forged product in FIG.
【図２０】第２発明の位相ズレを修正する歯車鍛造方法
における実施例２の第１鍛造工程、第２鍛造工程が施さ
れ、粗材から中間鍛造品をへて鍛造製品が製造される過
程を示す断面斜視図。FIG. 20 is a diagram illustrating a process in which the first forging step and the second forging step of the second embodiment in the gear forging method for correcting a phase shift according to the second invention are performed, and a forged product is manufactured from a rough material to an intermediate forged product. FIG.
【図２１】前記第２発明における実施例２の第１鍛造工
程、第２鍛造工程で用いられる荒地鍛造型および仕上げ
鍛造型の歯形ダイスと、中間鍛造品の歯形部との抜き勾
配の関係を示す縦断面図。FIG. 21 shows the relationship between the draft of the tooth dies of the rough land forging die and the finish forging die used in the first forging step and the second forging step of the second embodiment of the second invention and the tooth profile of the intermediate forged product. FIG.
【図２２】比較例の仕上げ鍛造型の歯形ダイスと、中間
鍛造品の歯形部との周方向の位相ズレを示す縦断面図。FIG. 22 is a longitudinal sectional view showing a circumferential phase shift between a tooth profile die of a finish forging die of a comparative example and a tooth profile portion of an intermediate forged product.
【図２３】前記第２発明における実施例２のサイジング
工程で用いられるサイジング型および歯車の要部を示す
縦断面図。FIG. 23 is a longitudinal sectional view showing a main part of a sizing die and gears used in a sizing step of Embodiment 2 in the second invention.
１、１Ａ…荒地鍛造型 ２、２Ａ、６、６Ａ…歯形ダイス ３、３Ａ、７、７Ａ
…パンチ ４０、８０…マンドリル ４１、８１…スリーブエジェ
クター ５、５Ａ…仕上げ鍛造型 ６、６Ａ…歯形ダ
イス ９Ａ…平歯車（製品） ９Ｂ…傾斜歯形部を備えた平歯
車（製品） ９ａ…粗材 ９ｂ１、９ｃ１…塑性変形しつ
つある粗材 ９ｂ、９ｃ…中間鍛造品1, 1A ... waste land forging die 2, 2A, 6, 6A ... tooth shape die 3, 3A, 7, 7A
... Punches 40,80 ... Mandrills 41,81 ... Sleeve ejector 5,5A ... Finishing forging die 6,6A ... Toothed die 9A ... Spur gear (product) 9B ... Spur gear with inclined tooth profile (product) 9a ... Coarse material 9b1, 9c1 ... plastically deforming coarse material 9b, 9c ... intermediate forged product
Claims (2)
用い、所定の半径で軸方向に厚い歯形環状頭部と、該歯
形環状頭部に連設され該歯形環状頭部の厚さより薄い厚
さの環状首部とをもつ中間鍛造品を粗材から鍛造する第
１鍛造工程と、 歯車形状の型面と、該環状首部の軸方向の両面の少なく
とも一方に対向する環状自由空間とをもつ仕上げ鍛造型
を用い、該歯形環状頭部の一部を該環状自由空間に流入
させつつ該歯形環状頭部を該歯車形状とする第２鍛造工
程と、よりなることを特徴とする歯車鍛造方法。1. A toothed annular head having a predetermined radius and being thick in an axial direction using a rough ground forging die having the original shape of a gear, and a thickness of the toothed annular head which is connected to the toothed annular head. A first forging step of forging an intermediate forged product having an annular neck portion having a smaller thickness from a rough material, a gear-shaped mold surface, and an annular free space facing at least one of both axial surfaces of the annular neck portion. A second forging step of making the tooth-shaped annular head into the gear shape while allowing a part of the tooth-shaped annular head to flow into the annular free space using a finishing forging die having the following. Forging method.
所定の抜き勾配に形成された型面をもつ荒地鍛造型を用
い、抜き勾配に形成され所定の半径で軸方向に厚い歯形
環状頭部と、該歯形環状頭部に連設され該歯形環状頭部
の厚さより薄い厚さの環状首部とをもつ中間鍛造品を粗
材から鍛造する第１鍛造工程と、 抜き勾配に形成された歯車形状の型面と、該環状首部の
軸方向の両面の少なくとも一方に対向する環状自由空間
とをもつ仕上げ鍛造型を用い、該歯形環状頭部の一部を
該環状自由空間に流入させつつ該歯形環状頭部を該歯車
形状とする第２鍛造工程と、 該歯車形状の歯形部をサイジングするサイジング工程
と、よりなることを特徴とする位相ズレを修正する歯車
鍛造方法。2. A toothless annular ring formed with a draft and having a predetermined radius and a predetermined radius, using a rough land forging die having a mold surface with a predetermined draft with respect to the original shape of the gear and the axis of the gear. A first forging step of forging an intermediate forged product having a head portion and an annular neck portion connected to the tooth-shaped annular head portion and having a thickness smaller than the thickness of the tooth-shaped annular head portion from a rough material; Using a finished forging die having a gear-shaped mold surface and an annular free space facing at least one of both axial sides of the annular neck, a part of the tooth-shaped annular head is caused to flow into the annular free space. A gear forging method for correcting a phase shift, comprising: a second forging step of making the tooth-shaped annular head into the gear shape; and a sizing step of sizing the tooth shape portion of the gear shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30454297A JPH11138232A (en) | 1997-11-06 | 1997-11-06 | Forging method of gear and gear forging method for correcting phase shift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30454297A JPH11138232A (en) | 1997-11-06 | 1997-11-06 | Forging method of gear and gear forging method for correcting phase shift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11138232A true JPH11138232A (en) | 1999-05-25 |
Family
ID=17934263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30454297A Pending JPH11138232A (en) | 1997-11-06 | 1997-11-06 | Forging method of gear and gear forging method for correcting phase shift |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11138232A (en) |
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| JP2002153938A (en) * | 2000-11-20 | 2002-05-28 | Honda Motor Co Ltd | Manufacturing method of member having shaft |
| JP2008307551A (en) * | 2007-06-12 | 2008-12-25 | Musashi Seimitsu Ind Co Ltd | Method and apparatus for forming gear |
| CN102527913A (en) * | 2011-12-31 | 2012-07-04 | 江苏森威精锻有限公司 | Precision plastic forming method for tooth direction drum repair of straight spur gear |
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| JP2002153938A (en) * | 2000-11-20 | 2002-05-28 | Honda Motor Co Ltd | Manufacturing method of member having shaft |
| JP4491810B2 (en) * | 2000-11-20 | 2010-06-30 | 本田技研工業株式会社 | Manufacturing method of shafted member |
| JP2008307551A (en) * | 2007-06-12 | 2008-12-25 | Musashi Seimitsu Ind Co Ltd | Method and apparatus for forming gear |
| KR200463405Y1 (en) * | 2010-10-29 | 2012-11-05 | 한국폴리텍7대학 산학협력단 | blocker of a counter shaft gear |
| CN102527913A (en) * | 2011-12-31 | 2012-07-04 | 江苏森威精锻有限公司 | Precision plastic forming method for tooth direction drum repair of straight spur gear |
| CN102563010A (en) * | 2012-02-15 | 2012-07-11 | 江苏创一精锻有限公司 | Bevel gear with inner hole having symmetrical inner round head flat keyway structure and precision forging process as well as mould punch thereof |
| CN103480787A (en) * | 2013-09-27 | 2014-01-01 | 江苏太平洋精锻科技股份有限公司 | Hot forging forming die for synchronous gear rings |
| JP2016190267A (en) * | 2015-03-31 | 2016-11-10 | 株式会社神戸製鋼所 | Forged suspension member |
| CN105436390A (en) * | 2015-11-03 | 2016-03-30 | 南昌大学 | Precision forming method for straight/helical tooth cylinder gear with corners easy to fill and die |
| JP2018144099A (en) * | 2017-03-09 | 2018-09-20 | 武蔵精密工業株式会社 | Method for forging dog for dog clutch and dog for dog clutch |
| CN110216232A (en) * | 2018-03-01 | 2019-09-10 | 上海汽车变速器有限公司 | The monoblock type conjunction gear gear forging technique of conjunction gear is shaped after first punching |
| CN109986006A (en) * | 2019-03-14 | 2019-07-09 | 桂林理工大学 | A kind of stainless steel hard disk shell precision forging forming method |
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