JPH0471618B2 - - Google Patents

Info

Publication number
JPH0471618B2
JPH0471618B2 JP28114287A JP28114287A JPH0471618B2 JP H0471618 B2 JPH0471618 B2 JP H0471618B2 JP 28114287 A JP28114287 A JP 28114287A JP 28114287 A JP28114287 A JP 28114287A JP H0471618 B2 JPH0471618 B2 JP H0471618B2
Authority
JP
Japan
Prior art keywords
die
punch
hollow
hole
solid material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP28114287A
Other languages
Japanese (ja)
Other versions
JPH01127133A (en
Inventor
Toshio Maeda
Choji Miura
Michitoshi Kono
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP28114287A priority Critical patent/JPH01127133A/en
Priority to CA000571907A priority patent/CA1294463C/en
Priority to US07/218,248 priority patent/US4939829A/en
Publication of JPH01127133A publication Critical patent/JPH01127133A/en
Publication of JPH0471618B2 publication Critical patent/JPH0471618B2/ja
Granted legal-status Critical Current

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  • Gears, Cams (AREA)
  • Forging (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は中空ギアの製造方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a hollow gear.

(従来技術) 従来、中空ギアを製造する方法としては、中実
素材を直接押出成形する方法と、一旦中実素材に
よつて中空素材を形成し、その後押出成形する方
法が知られている。
(Prior Art) Conventionally, known methods for manufacturing hollow gears include a method in which a solid material is directly extruded, and a method in which a hollow material is once formed from a solid material and then extruded.

前者の方法は成形の工程が少ないという利点を
有するが、反面、成形する形状が薄肉で複雑にな
ると、押出成形の断面減少率が高くなり、金型に
無理が生ずる。
The former method has the advantage of requiring fewer molding steps, but on the other hand, if the shape to be molded becomes thin and complicated, the cross-sectional reduction rate of extrusion molding will be high, causing strain on the mold.

一方、後者の方法は前者の方法に比べ中空素材
を形成する手間を余計に要するが、前者の方法よ
りも低い断面減少率で押出成形することができ、
金型に無理なく、例えば自動車用トランスミツシ
ヨンギア等の複雑で薄肉の形状のギアの押出成形
に好適である。
On the other hand, the latter method requires more effort to form a hollow material than the former method, but it can be extruded with a lower cross-sectional reduction rate than the former method.
It is suitable for extrusion molding of complex, thin-walled gears such as automobile transmission gears without straining the mold.

後者の中空素材を介する中空ギアの製造方法と
しては、通常、第7図示の如き形状の中実素材W
1′を形成し、該素材W1′の中央部aを孔開け
し、さらに周縁部bに歯部を形成する方法が知ら
れている。なお該素材W1′の凹部H1′は孔開け
による金型の負荷を低減するため必要に応じて設
けたものである。
The latter method of manufacturing a hollow gear using a hollow material usually involves manufacturing a solid material W having a shape as shown in Fig. 7.
1', a hole is formed in the center part a of the material W1', and a tooth part is further formed in the peripheral part b. Note that the recess H1' in the material W1' is provided as necessary to reduce the load on the mold due to drilling.

しかしながら、該中空素材W1′の中央部aが
第7図示の如く平坦面であり、さらに角部R1′
及びR2′が略直角の角度に設けられていると、
第8図の如く、パンチ1′及びダイ2′で孔開けを
して第9図示の中空素材W2′を形成する時に、
該パンチ1′及びダイ2′のクリアランスX1′に
該素材W1′の肉が引込まれて第9図示のcで示
すようなバリが生ずる。
However, the center part a of the hollow material W1' is a flat surface as shown in FIG. 7, and the corner part R1'
and R2' are provided at substantially right angles,
As shown in FIG. 8, when forming a hollow material W2' shown in FIG. 9 by making holes with a punch 1' and a die 2',
The flesh of the material W1' is drawn into the clearance X1' between the punch 1' and the die 2', resulting in burrs as shown by c in FIG.

さらに、角部R2′は略直角に近く第8図示の
如く、ダイ2′の角部と略密着する為、孔開け時
に該角部R2′とダイ2′との摺接部に施された潤
滑油(図示せず)が外部に押しやられ、該角部R
2′がダイ2′の内面をかじる懸念がある。
Furthermore, since the corner R2' is approximately at a right angle and is in close contact with the corner of the die 2' as shown in Figure 8, the sliding contact between the corner R2' and the die 2' is made at the time of drilling the hole. Lubricating oil (not shown) is forced to the outside and the corner R
There is a concern that the die 2' may bite the inner surface of the die 2'.

また、第9図示の中空素材W2′のバリcをそ
のままにして第10図示の如く、中空のパンチ
3′とマンドレル4′によつて歯形成部5a′を有す
るダイ5′に押出成形して第11図示の歯部d′を
有する中空ギアを成形すると、該ギアの中空部の
下端周縁部eにバリが食込んで製品の外観を損う
とともに、巻込み欠陥となり、またマンドレルの
表面を傷つけてしまう。
Further, the hollow material W2' shown in FIG. 9 is extruded into a die 5' having a tooth forming part 5a' using a hollow punch 3' and a mandrel 4', as shown in FIG. 10, with the burr c intact. When a hollow gear having teeth d' shown in Fig. 11 is molded, burrs dig into the lower peripheral edge e of the hollow part of the gear, spoiling the appearance of the product, causing entrainment defects, and damaging the surface of the mandrel. It will hurt you.

さらに前記角部R2′は前記と同様にダイ5′の
内面をかじり、歯部形成部5a′を損傷する懸念が
高い。
Further, there is a high possibility that the corner R2' may bite the inner surface of the die 5' and damage the tooth forming portion 5a', as described above.

また、素材W2′の角部R1′は略直角に近い形
状である為に、第10図示のようにパンチ3′に
より押圧された時に、該角部R1′がパンチ3′及
びダイ5′に略密着する為に、該パンチ3′及びダ
イ5′のクリアランスX2′に該角部R1′の肉が
引き込まれて、第11図示のようなバリfを生ず
る傾向がある。
In addition, since the corner R1' of the material W2' has a shape close to a right angle, when pressed by the punch 3' as shown in Figure 10, the corner R1' touches the punch 3' and the die 5'. Because of the nearly intimate contact, the flesh of the corner R1' tends to be drawn into the clearance X2' between the punch 3' and the die 5', resulting in a burr f as shown in FIG.

このようなバリfは前記バリの食込み部eと同
様にギアの製品価値を著しく下げるものであり、
その為に前記第9図示のバリcあるいは第11図
示のバリfを除去することは大変に手間がかか
る。
Such a burr f, like the burr biting part e, significantly reduces the product value of the gear,
Therefore, it is very time consuming to remove the burr c shown in the ninth figure or the burr f shown in the eleventh figure.

(解決すべき問題点) かかる不都合に対処すべく、本発明はバリを抑
制でき、金型の損傷の少ない中空ギアの製造方法
を提供することを目的とする。
(Problems to be Solved) In order to deal with such inconveniences, an object of the present invention is to provide a method for manufacturing a hollow gear that can suppress burrs and cause less damage to the mold.

(問題を解決する為の手段) かかる目的を達成すべく、本発明による中空ギ
アの製造方法は、中実素材をパンチ及びダイによ
り孔開けして中空素材を形成する孔開工程と、マ
ンドレルに該中空素材を装着し、パンチによつて
該中空素材に押圧変形し、該中空素材の外周に配
設した歯部形成部を有するダイに押出すことによ
り歯部を形成する歯部形成工程とから成る中空ギ
アの製造方法において、前記中実素材がパンチと
反対側の端面部に外側最大径がパンチの外径より
大でありパンチ側にむかつて縮径する凹部が設け
られ、前記孔開工程及び歯部形成工程において金
型と摺接することとなる角部を曲率部に形成さ
れ、さらに前記中空素材が前記孔開工程において
前記中実素材の凹部の最小径部と同心に該小径部
より僅に大径に孔開けして形成されることを特徴
とする。
(Means for solving the problem) In order to achieve the above object, the method for manufacturing a hollow gear according to the present invention includes a hole-forming step of forming a hollow material by punching a hole in a solid material using a punch and a die, and a hole-forming step of forming a hollow material using a mandrel. a tooth forming step in which the hollow material is mounted, the hollow material is pressed and deformed by a punch, and the hollow material is extruded into a die having a tooth forming portion disposed on the outer periphery of the hollow material to form teeth; In the method for manufacturing a hollow gear, the solid material is provided with a concave portion on the end face opposite to the punch, the maximum outer diameter of which is larger than the outer diameter of the punch, and whose diameter decreases toward the punch side, In the process and the tooth forming process, the corner part that comes into sliding contact with the mold is formed into a curved part, and the hollow material is further formed with the small diameter part concentrically with the minimum diameter part of the concave part of the solid material in the hole making process. It is characterized by being formed by drilling a hole with a slightly larger diameter.

(作用) かかる手段において、前記中実素材の凹部は前
記孔開工程において生ずるバリとなる該素材の肉
部を予め除去した形状となつているので該凹部の
設けられた側の素材端面より外方にバリが延出す
ることを抑制する。
(Function) In this means, the recess of the solid material has a shape in which the flesh of the material, which becomes burrs generated in the hole-drilling step, has been removed in advance, so that the recess is formed outside the end surface of the material on the side where the recess is provided. Prevents burrs from extending in the opposite direction.

前記中実素材に形成された曲率部のうち、前記
孔開工程及び歯部形成工程において、前記ダイの
内面に挟まれる部分は該ダイの内面との間に間隙
を設けて潤滑油を留保することを可能とするとと
もに、該ダイ内面との摺接を滑らかにする。
Of the curvature portions formed in the solid material, the portions sandwiched between the inner surfaces of the die in the hole-drilling step and tooth-forming step retain lubricating oil by providing a gap with the inner surface of the die. This enables smooth sliding contact with the inner surface of the die.

さらに前記歯部形成工程においてパンチとダイ
の内面に挟まれる前記中実素材の曲率部は該パン
チ及びダイのクリアランスとの間に間隙を設け
て、該中実素材が該クリアランスに引込まれるこ
とによるバリの発生を抑制する。
Furthermore, in the tooth forming step, the curvature portion of the solid material sandwiched between the inner surfaces of the punch and the die provides a gap between the clearance of the punch and the die, and the solid material is drawn into the clearance. Suppresses the occurrence of burrs caused by

(実施例) 以下、図面に基き本発明の一実施例について詳
説する。
(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

第1図示のW1は本発明のギアの製造方法に用
いる中実素材の一例である。
W1 shown in the first figure is an example of a solid material used in the gear manufacturing method of the present invention.

該素材W1は両端面から内側に食込む凹部H
1,H2が設けられている。
The material W1 has a recess H that digs inward from both end surfaces.
1 and H2 are provided.

該凹部H1は前記孔開工程においてパンチにか
かる負担を低減する為に必要に応じて設けられた
ものであり、凹部H2は前記凹部H1が設けられ
た端面と反対側の端面に設けられ、孔開工程で用
いるパンチの外径により外側最大径が大であり素
材W1内部に向つて次第に縮径した略円錐台の形
状を呈している。
The recess H1 is provided as necessary to reduce the load on the punch in the hole punching process, and the recess H2 is provided on the end surface opposite to the end surface where the recess H1 is provided. Due to the outer diameter of the punch used in the opening process, the outer maximum diameter is large, and the material W1 has a substantially truncated conical shape whose diameter gradually decreases toward the inside of the material W1.

該凹部H2の斜面は所定の傾斜角度θを有して
おり、その好適な範囲は30°〜45°である。
The slope of the recess H2 has a predetermined inclination angle θ, and the preferred range is 30° to 45°.

この傾斜角度θが30°より小さい場合は孔開工
程により前記した従来の方法と同様のバリが発生
しやすく、また45°以上になると、前記第8図示
のような孔開工程中に、パンチで該素材W1の中
間部Aが押圧されると左右の肉部B及びCが内側
にたわみ、形成される中空素材の形状が損われる
虞れがある。
If the inclination angle θ is smaller than 30°, burrs are likely to occur during the hole-drilling process, similar to those in the conventional method described above, and if it is 45° or more, the punching process as shown in FIG. When the intermediate portion A of the material W1 is pressed, the left and right flesh portions B and C may bend inward, and the shape of the hollow material to be formed may be damaged.

なお該中実素材W1は第2図示の如き周縁部6
aを備えたパンチ6とダイ7、及びダイ7の側壁
部7aで構成される押出成形によつて形成するこ
とができる。
The solid material W1 has a peripheral edge 6 as shown in the second figure.
It can be formed by extrusion molding, which is composed of a punch 6 having a diameter of 1.5 mm, a die 7, and a side wall portion 7a of the die 7.

該素材W1を第3図のように前記パンチ1及び
ダイ2によつて孔開けすると、該素材W1の曲率
部R2とダイ2との間に間隙Dができ、該間隙D
の間に潤滑油(図示せず)が留保されるので、該
曲率部R2によつてダイ2の内面が損傷を受ける
ことはほとんどなくなる。
When the material W1 is punched using the punch 1 and die 2 as shown in FIG. 3, a gap D is created between the curvature R2 of the material W1 and the die 2.
Since lubricating oil (not shown) is retained during this period, the inner surface of the die 2 is hardly damaged by the curved portion R2.

また、パンチ1は該素材W1の凹部H2の斜面
上端を打抜いてパンチ1びダイ2のクリアランス
X1に引込まれる肉部が予め除去されているので
第4図示の如く、孔開けした中空素材WB2に生
ずるバリgは製品の外観を損なわずまた後工程で
ある歯部形成工程において金型を損傷しない程度
に小さく抑制することができる。
Further, since the punch 1 punches the upper end of the slope of the recessed portion H2 of the material W1 and the flesh portion drawn into the clearance X1 between the punch 1 and the die 2 has been removed in advance, the punch 1 punches out the upper end of the slope of the recessed portion H2 of the material W1. The burrs generated on the WB2 can be suppressed to a small size without impairing the appearance of the product or damaging the mold in the subsequent tooth forming step.

さらに該素材W2を第5図のように前記パンチ
3、マンドレル4及び歯部形成部5aを有するダ
イ5で構成される金型で歯部が形成される。
Furthermore, as shown in FIG. 5, teeth are formed on the raw material W2 using a mold consisting of the punch 3, the mandrel 4, and a die 5 having a tooth forming portion 5a.

この際前記曲率部R1はパンチ3及びダイ5の
クリアランスX2と間隙Eを形成しているので、
該クリアランスX2に素材W2の肉が引込まれて
バリが生ずる懸念がなくなり、また他方の曲率部
R2は前記と同様に作用するので、ダイ5の歯部
形成部5aの近傍の部分にかじりが生ずることを
回避できる。
At this time, since the curvature portion R1 forms a gap E with the clearance X2 between the punch 3 and the die 5,
There is no fear that the flesh of the material W2 will be drawn into the clearance X2 and burrs will occur, and since the other curvature portion R2 acts in the same manner as described above, galling will occur in the portion of the die 5 near the tooth forming portion 5a. You can avoid that.

従つて本発明の実施例の方法によれば、第6図
の如き歯部dを有する中空ギアをバリに煩うこと
なく、また金型を損傷させることなく形成するこ
とができる。
Therefore, according to the method of the embodiment of the present invention, a hollow gear having teeth d as shown in FIG. 6 can be formed without causing burrs or damaging the mold.

(効果) 従つて本発明によれば、前記中実素材の凹部は
前記孔開工程において生ずるバリを抑制でき、該
素材の曲率部は前記孔開工程及び歯部形成工程に
おいてダイ内面との間に潤滑油を留保して該ダイ
内面との摺接を滑らかにすることと、さらに前記
歯部形成工程においてパンチ及びダイのクリアラ
ンスで生ずるバリを抑制することができるので、
外観が良好で金型の損傷することの少ない中空ギ
アの製造方法を提供することができる。
(Effects) Therefore, according to the present invention, the concave portion of the solid material can suppress burrs generated in the hole-drilling step, and the curved portion of the material can prevent burrs from forming between the hollow portion and the inner surface of the die in the hole-drilling step and tooth forming step. By retaining lubricating oil in the die, it is possible to smooth the sliding contact with the inner surface of the die, and furthermore, it is possible to suppress burrs caused by the clearance between the punch and the die in the tooth forming step.
It is possible to provide a method for manufacturing a hollow gear that has a good appearance and is less likely to damage a mold.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の中空ギアの製造方法による中
実素材の一実施例の断面図、第2図は第1図示の
中実素材の成形方法を説明する為の説明的断面
図、第3図は本発明の方法における孔開工程を説
明する為の説明的断面図、第4図は本発明の方法
により第1図示の中実素材から形成された中空素
材の断面図、第5図は本発明の方法における歯部
形成工程を説明する為の説明的断面図、第6図は
本発明の方法による中空ギアの断面図、第7図は
従来の中空ギアの製造方法による中実素材の断面
図、第8図は第7図に基く孔開工程の説明的断面
図、第9図は第7図及び第8図に基く中空素材の
断面図、第10図は第7図乃至第9図に基く歯部
形成工程の説明的断面図、また第11図は第7図
乃至第10図に基く中空ギアの説明的断面図であ
る。 1,3……パンチ、2,5……ダイ、4……マ
ンドレル、5a……歯部形成部、d……歯部、H
2……凹部、W1……中実素材、W2……中空素
材、R1,R2……曲率部。
FIG. 1 is a sectional view of an embodiment of a solid material according to the method for manufacturing a hollow gear of the present invention, FIG. 2 is an explanatory sectional view for explaining the method of forming the solid material shown in FIG. 1, and FIG. The figure is an explanatory cross-sectional view for explaining the hole-drilling step in the method of the present invention, FIG. 4 is a cross-sectional view of a hollow material formed from the solid material shown in FIG. 1 by the method of the present invention, and FIG. An explanatory cross-sectional view for explaining the tooth forming step in the method of the present invention, FIG. 6 is a cross-sectional view of a hollow gear according to the method of the present invention, and FIG. 8 is an explanatory sectional view of the hole-drilling process based on FIG. 7, FIG. 9 is a sectional view of the hollow material based on FIGS. 7 and 8, and FIG. 10 is an explanatory sectional view of the hole drilling process based on FIG. FIG. 11 is an explanatory sectional view of the tooth forming process based on the figure, and FIG. 11 is an explanatory sectional view of the hollow gear based on FIGS. 7 to 10. 1, 3...Punch, 2, 5...Die, 4...Mandrel, 5a...Tooth forming part, d...Tooth part, H
2...Concave portion, W1...Solid material, W2...Hollow material, R1, R2...Curvature portion.

【特許請求の範囲】[Claims]

1 異形棒鋼を用いてロツクボルトを形成するに
当り、所要長さに切断した棒鋼の一方の端部を冷
間もしくは熱間で尖つた形に成形し、他方の端部
は適宜長さの区間を鍛造可能温度に加熱して、プ
レス金型にて回動用四角柱部と転造ねじ下径の丸
棒部とに一挙に鍛圧成形し、しかる後該ねじ下型
丸棒部をブラツシングして清浄にした後、転造盤
にかけて転造ねじ成形することを特徴とするロツ
クボルトの製造方法。
1. When forming lock bolts using deformed steel bars, one end of the steel bar cut to the required length is cold or hot formed into a pointed shape, and the other end is shaped into a section of appropriate length. Heating to a temperature that allows for forging, the rotating square column part and the round bar part with the lower diameter of the threaded thread are forged all at once in a press mold, and then the lower threaded round bar part is brushed and cleaned. A method for manufacturing a lock bolt, which is characterized in that the lock bolt is formed into a thread-rolling machine and then formed into a thread-rolling machine.

JP28114287A 1987-07-13 1987-11-09 Manufacture of hollow gear Granted JPH01127133A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP28114287A JPH01127133A (en) 1987-11-09 1987-11-09 Manufacture of hollow gear
CA000571907A CA1294463C (en) 1987-07-13 1988-07-13 Method of and apparatus for manufacturing a gear
US07/218,248 US4939829A (en) 1987-07-13 1988-07-13 Method of and apparatus for manufacturing a gear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28114287A JPH01127133A (en) 1987-11-09 1987-11-09 Manufacture of hollow gear

Publications (2)

Publication Number Publication Date
JPH01127133A JPH01127133A (en) 1989-05-19
JPH0471618B2 true JPH0471618B2 (en) 1992-11-16

Family

ID=17634950

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28114287A Granted JPH01127133A (en) 1987-07-13 1987-11-09 Manufacture of hollow gear

Country Status (1)

Country Link
JP (1) JPH01127133A (en)

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Publication number Priority date Publication date Assignee Title
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

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