JPH06226392A - Method for forging disk shaped body such as gear - Google Patents
Method for forging disk shaped body such as gearInfo
- Publication number
- JPH06226392A JPH06226392A JP1425793A JP1425793A JPH06226392A JP H06226392 A JPH06226392 A JP H06226392A JP 1425793 A JP1425793 A JP 1425793A JP 1425793 A JP1425793 A JP 1425793A JP H06226392 A JPH06226392 A JP H06226392A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- axial direction
- base material
- forging
- punch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、平歯車等の円盤状体を
閉塞鍛造によって成形する際に好適な方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method suitable for forming a disk-shaped body such as a spur gear by closed forging.
【０００２】[0002]
【従来の技術】図７は一般的な平歯車を鍛造成形してい
る状態を示しており、これによると、円柱状の材料を、
ダイ１の中に入れてパンチ２により冷間鍛造を行って、
成形品である平歯車３を得ている。2. Description of the Related Art FIG. 7 shows a state in which a general spur gear is forged. According to this, a cylindrical material is
Put it in the die 1 and perform cold forging with the punch 2,
A spur gear 3 which is a molded product is obtained.
【０００３】[0003]
【発明が解決しようとする課題】上記方法の場合、得ら
れた平歯車３の歯３ａが形成された周面は、軸方向両端
の円周部から軸方向中央にかけて徐々に大径となる曲面
状を呈する。これは、塑性流動の特性上、肉が軸方向両
端の円周部までいきわたりにくいことに起因するもの
で、歯面の有効長が一部無くなる欠陥である。このよう
な欠陥をなくして均一な径に成形するにはきわめて高い
鍛造荷重が必要となるが、その場合には金型（ダイ）の
破壊を招くおそれがある。すなわち金型の耐圧限界まで
の成形品しか製造することができない。In the case of the above method, the peripheral surface of the obtained spur gear 3 on which the teeth 3a are formed is a curved surface whose diameter gradually increases from the circumferential portions at both axial ends to the axial center. Take on a shape. This is because, due to the characteristics of plastic flow, it is difficult for the meat to spread to the circumferential portions at both ends in the axial direction, and this is a defect in which the effective length of the tooth surface is partially lost. An extremely high forging load is required to eliminate such defects and form a uniform diameter, but in that case, the die (die) may be broken. That is, only a molded product up to the pressure limit of the mold can be manufactured.
【０００４】本発明は上記事情に鑑みてなされたもので
あって、過大な鍛造荷重を要することなくほぼ均一な径
が得られる歯車等の円盤状体の鍛造成形方法を提供する
ことを目的としている。The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for forging a disk-shaped body such as a gear that can obtain a substantially uniform diameter without requiring an excessive forging load. There is.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するためになされたもので、円筒状素材を仕上げ径より
も小さく軸方向長さが長い第１の素材を形成する工程
と、第１の素材の軸方向両端の円周部を第１の素材の軸
方向中央の径より大径に流動させ第２の素材を形成する
工程と、第２の素材をさらに加圧して軸方向全長にわた
って径方向に流動させる工程とを有することを特徴とし
ている。The present invention has been made in order to achieve the above-mentioned object, and includes the steps of forming a first material having a cylindrical material with a smaller axial length and a smaller diameter than the finishing diameter. A step of forming a second material by flowing the circumferential portions of both ends of the first material in the axial direction to a diameter larger than the diameter of the first material in the axial center, and further pressing the second material to make the entire length in the axial direction. And a step of causing the fluid to flow in the radial direction.
【０００６】[0006]
【作用】本発明によれば、第１の素材に対して鍛造加工
を施する際に、軸方向両端の円周部を第１の素材の軸方
向中央の径より大径に流動させることにより、この大径
部が形成された第２の素材に対する鍛造加工を行った際
に軸方向両端の円周部への肉の流れが足りなくても、そ
の円周部が小径となることを防ぐことができ、ほぼ均一
な径の円盤状体を得ることができる。According to the present invention, when the first material is forged, the circumferential portions at both ends in the axial direction are made to flow to a diameter larger than the diameter of the axial center of the first material. , When the forging process is performed on the second material having the large diameter portion, the diameter of the circumferential portion is prevented from becoming small even if the flow of meat to the circumferential portions at both axial ends is insufficient. It is possible to obtain a disk-shaped body having a substantially uniform diameter.
【０００７】[0007]
【実施例】以下、図面を参照して本発明の一実施例に係
る平歯車の成形方法を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spur gear forming method according to an embodiment of the present invention will be described below with reference to the drawings.
【０００８】図１〜図４は、一実施例により平歯車１０
を鍛造成形する工程を順に示しており、図４の１０が得
られた平歯車（円盤状体）を示している。1 to 4 show a spur gear 10 according to an embodiment.
The steps of forging and forming are shown in order, and the spur gear (disc-shaped body) 10 obtained in FIG. 4 is shown.
【０００９】この平歯車１０を製造するにあたっては、
まず、図１に示す鋼等の塑性変形可能な金属からなる丸
棒状の材料１０Ａを、図２に示すように、第１のダイ１
１に入れ、材料１０Ａに対し軸方向から第１のパンチ１
２により第１段階の鍛造加工（冷間）を施して第１の素
材１０Ｂを得る。この第１の素材１０Ｂは、最終的な平
歯車１０よりも軸方向長さが大きく、かつ周面が、軸方
向中央が大径である曲面状である。In manufacturing the spur gear 10,
First, a round rod-shaped material 10A made of a plastically deformable metal such as steel shown in FIG.
1st punch 1 from the axial direction with respect to material 10A
According to 2, the first stage forging process (cold) is performed to obtain the first material 10B. This first material 10B has a longer axial length than the final spur gear 10, and the peripheral surface is a curved surface having a large diameter in the axial center.
【００１０】次に、図３に示すように、第１の素材１０
Ｂを第２のダイ１３に入れ、第１の素材１０Ｂに対し軸
方向から第２のパンチ１４により第２段階の鍛造加工を
施して第２の素材１０Ｃを得る。第２のダイ１３は、下
方に第１の素材１０Ｂの歯部を除く本体部よりもやや小
径である断面円形の空洞１３ａがあいており、一方第２
のパンチ１４は、空洞１３ａと同径の空洞１４ａを有す
る筒状に形成されている。Next, as shown in FIG. 3, the first material 10
B is put into the second die 13 and the second blank 10C is obtained by subjecting the first blank 10B to the second punch 14 from the axial direction by the second punch 14. The second die 13 has a cavity 13a having a circular cross section, which is slightly smaller in diameter than the main body portion of the first material 10B excluding the tooth portions, on the other hand,
The punch 14 is formed in a tubular shape having a cavity 14a having the same diameter as the cavity 13a.
【００１１】この第２段階の鍛造加工により成形された
第２の素材１０Ｃは、図５に示すように、両端面の中央
に突起１５が形成されるとともに、軸方向両端の円周部
に、径方向にせり出す大径部１６がせん断により形成さ
れる。すなわち、第１の素材１０Ｂは第２のダイ１３お
よび第２のパンチ１４によって空洞１３ａ、１４ａを残
してせん断されるとともに軸方向に加圧されるため、第
２の素材１０Ｃの周面は、軸方向中央から軸方向両端の
円周部にかけて徐々に大径となる曲面状を呈する。As shown in FIG. 5, the second raw material 10C formed by this second stage forging process has a projection 15 formed at the center of both end faces, and at the circumferential portions at both axial ends, The large diameter portion 16 protruding in the radial direction is formed by shearing. That is, since the first material 10B is sheared by the second die 13 and the second punch 14 leaving the cavities 13a, 14a and pressed axially, the peripheral surface of the second material 10C is The curved surface gradually increases in diameter from the center in the axial direction to the circumferential portions at both ends in the axial direction.
【００１２】この後、図４に示すように、第３のダイ１
７、第３のパンチ１８によって、第２の素材１０Ｃに対
し軸方向から第３段階の鍛造加工を施し、最終的な製品
である平歯車１０を得る。この平歯車１０は、周面の軸
方向中央に肉が流れ、図６に示すように、歯１０ａの周
面が軸方向に沿ってほぼ真っ直ぐに形成される。すなわ
ち平歯車１０は、ほぼ均一な径を有する。なお、突起１
５は歯車１０を支承する軸として使用される。Thereafter, as shown in FIG. 4, the third die 1
7. The third punch 18 performs a third stage forging process on the second material 10C in the axial direction to obtain the final product, the spur gear 10. In the spur gear 10, the meat flows in the axial center of the peripheral surface, and as shown in FIG. 6, the peripheral surface of the tooth 10a is formed substantially straight along the axial direction. That is, the spur gear 10 has a substantially uniform diameter. In addition, the protrusion 1
5 is used as a shaft for supporting the gear 10.
【００１３】上記方法によれば、第１の素材１０Ｂに対
して第２段階の鍛造加工を施した際に、あらかじめ軸方
向両端の円周部に径方向にせり出す大径部１６を形成す
ることにより、歯１０ａの軸方向両端の円周部が小径と
なることを防ぎ得ており、ほぼ均一な径の平歯車１０を
得ることができるわけである。また、第２のダイ１３と
第２のパンチ１４の空洞１３ａ、１４ａを適宜設定する
ことによって、図３に示す工程と図４に示す工程とを同
時に行うことができる。According to the above-mentioned method, when the first material 10B is subjected to the second stage forging, the large diameter portions 16 protruding in the radial direction are previously formed on the circumferential portions at both ends in the axial direction. By this, it is possible to prevent the circumferential portions at both ends of the tooth 10a in the axial direction from having a small diameter, and it is possible to obtain the spur gear 10 having a substantially uniform diameter. Further, by appropriately setting the cavities 13a and 14a of the second die 13 and the second punch 14, the step shown in FIG. 3 and the step shown in FIG. 4 can be performed at the same time.
【００１４】[0014]
【発明の効果】以上説明したように、本発明の歯車等の
円盤状体の鍛造成形方法によれば、第１の素材に対して
鍛造加工を施す際に、軸方向両端の円周部を第１の素材
の軸方向中央の径より大径に流動させることにより、こ
の大径部が形成された第２の素材に対する鍛造加工を行
った際に軸方向両端の円周部への肉の流れが足りなくて
も、その円周部が小径となることを防ぐことができ、ほ
ぼ均一な径の円盤状体を得ることができ、したがって、
過大な鍛造荷重を要することなくほぼ均一な径を有する
歯車等の円盤状体を得ることができるといった効果を奏
する。As described above, according to the method for forging a disk-shaped body such as a gear according to the present invention, when the first material is forged, the circumferential portions at both ends in the axial direction are formed. When the second material having the large-diameter portion is forged by flowing the first material so as to have a diameter larger than the diameter of the center of the first material in the axial direction, the thickness of the circumferential portion at both ends in the axial direction is reduced. Even if the flow is insufficient, it is possible to prevent the circumferential portion from having a small diameter, and it is possible to obtain a disk-shaped body having a substantially uniform diameter.
It is possible to obtain a disk-shaped body such as a gear having a substantially uniform diameter without requiring an excessive forging load.
【図１】本発明の一実施例方法を適用して平歯車を鍛造
により成形する際の初期材料を示す平面図および側面図
である。FIG. 1 is a plan view and a side view showing an initial material when a spur gear is formed by forging by applying a method according to an embodiment of the present invention.
【図２】一実施例方法の第１段階の鍛造工程を示す側面
図およびそれにより成形された第１の素材の平面図であ
る。FIG. 2 is a side view showing a first stage forging step of the method of one embodiment and a plan view of a first material formed by the forging step.
【図３】同第２段階の鍛造工程を示す側面図およびそれ
により成形された第２の素材の平面図である。FIG. 3 is a side view showing the forging step of the second stage and a plan view of a second material formed by the side view.
【図４】同第３段階の鍛造工程を示す側面図およびそれ
により成形された最終製品の平面図である。FIG. 4 is a side view showing the forging process of the third stage and a plan view of a final product molded by the side view.
【図５】第２の素材の側面図である。FIG. 5 is a side view of a second material.
【図６】最終製品の側面図である。FIG. 6 is a side view of the final product.
【図７】従来の鍛造成形の方法を示す側面図およびそれ
によって得られた製品の平面図である。FIG. 7 is a side view showing a conventional forging method and a plan view of a product obtained thereby.
１０ 平歯車（円盤状体） １０Ｂ 第１の素材 １０Ｃ 第２の素材 １６ 大径部 10 spur gear (disc-shaped body) 10B 1st material 10C 2nd material 16 large diameter part
Claims (1)
て、円筒状素材を仕上げ径よりも小さく軸方向長さが長
い第１の素材を形成する工程と、第１の素材の軸方向両
端の円周部を第１の素材の軸方向中央の径より大径に流
動させ第２の素材を形成する工程と、第２の素材をさら
に加圧して軸方向全長にわたって径方向に流動させる工
程とを有することを特徴とする歯車等の円盤状体の鍛造
成形方法。1. A method for forging a disk-shaped body such as a gear, which comprises a step of forming a first material of a cylindrical material having a smaller axial length and a smaller diameter than the finished diameter, and a shaft of the first material. Forming a second material by flowing the circumferential parts at both ends in the axial direction to a diameter larger than the diameter of the axial center of the first material, and further pressurizing the second material to flow radially over the entire axial length A method for forging a disk-shaped body such as a gear having a step of:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5014257A JP2823467B2 (en) | 1993-01-29 | 1993-01-29 | Forging method of disk-shaped body such as gears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5014257A JP2823467B2 (en) | 1993-01-29 | 1993-01-29 | Forging method of disk-shaped body such as gears |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06226392A true JPH06226392A (en) | 1994-08-16 |
| JP2823467B2 JP2823467B2 (en) | 1998-11-11 |
Family
ID=11856044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5014257A Expired - Lifetime JP2823467B2 (en) | 1993-01-29 | 1993-01-29 | Forging method of disk-shaped body such as gears |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2823467B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006040840A1 (en) * | 2004-10-15 | 2006-04-20 | Kondo Seiko Co., Ltd. | Method for manufacturing toothed parts |
| JP2008307551A (en) * | 2007-06-12 | 2008-12-25 | Musashi Seimitsu Ind Co Ltd | Method and apparatus for forming gear |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH035039A (en) * | 1989-06-02 | 1991-01-10 | Mazda Motor Corp | Apparatus for forming gear |
| JPH05351A (en) * | 1991-06-24 | 1993-01-08 | Aida Eng Ltd | Plastic working method for member having identical cross sectional shape |
-
1993
- 1993-01-29 JP JP5014257A patent/JP2823467B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH035039A (en) * | 1989-06-02 | 1991-01-10 | Mazda Motor Corp | Apparatus for forming gear |
| JPH05351A (en) * | 1991-06-24 | 1993-01-08 | Aida Eng Ltd | Plastic working method for member having identical cross sectional shape |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006040840A1 (en) * | 2004-10-15 | 2006-04-20 | Kondo Seiko Co., Ltd. | Method for manufacturing toothed parts |
| US7677073B2 (en) | 2004-10-15 | 2010-03-16 | Kondo Seiko Co., Ltd. | Method of manufacturing tooth profile part |
| JP2008307551A (en) * | 2007-06-12 | 2008-12-25 | Musashi Seimitsu Ind Co Ltd | Method and apparatus for forming gear |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2823467B2 (en) | 1998-11-11 |
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