JPS63203240A - Forging method for tooth profile part - Google Patents
Forging method for tooth profile partInfo
- Publication number
- JPS63203240A JPS63203240A JP3244487A JP3244487A JPS63203240A JP S63203240 A JPS63203240 A JP S63203240A JP 3244487 A JP3244487 A JP 3244487A JP 3244487 A JP3244487 A JP 3244487A JP S63203240 A JPS63203240 A JP S63203240A
- Authority
- JP
- Japan
- Prior art keywords
- tooth profile
- tooth
- forging
- diameter part
- excess metal
- 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
- 238000005242 forging Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract 3
- 239000000463 material Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 102100040160 Rabankyrin-5 Human genes 0.000 description 1
- 101710086049 Rabankyrin-5 Proteins 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
- F16H55/171—Toothed belt pulleys
Landscapes
- Gears, Cams (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は歯形部品の鍛造方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for forging toothed parts.
（従来技術）
従来、例えば第４図に示すような小径部１ａと大径部１
ｂとが同軸状に連接して段部２を形成する素材１′の小
径部１ａに鍛造金型を用いた鍛造により第５図に示すよ
うな歯車３の歯形３ａを形成する方法が、特公昭５６−
３３１７３号公報によって知られている。上記歯車３は
例えば自動車のトランスミッションのシンクロスプライ
ンギヤとして用いられるものであるが、実際に形成され
る歯車３′は、鍛造時における歯形３ａの歯筋方向（軸
線方向）からの圧力によって素材１′の一部が大径部ｌ
ｂ側に折れこむことにより、第６図に示すような余肉（
パリ）４が歯形３ａに隣接して形成され易いものである
。そのため、鍛造時の圧力を高（して、上記余肉４の形
成される部分を強圧することにより、余肉４の高さが低
くなるようにしているが、高鍛造荷重を必要とするため
、型寿命が短かくなるばかりでなく、余肉４部分の強圧
によりその折れこみ部からクランク５が発生する問題が
あった。(Prior Art) Conventionally, for example, a small diameter portion 1a and a large diameter portion 1 as shown in FIG.
Particularly, there is a method of forming the tooth profile 3a of the gear 3 as shown in FIG. Kosho 56-
It is known from Publication No. 33173. The gear 3 is used, for example, as a synchro spline gear in an automobile transmission, but the gear 3' that is actually formed is formed by pressing the material 1' in the tooth trace direction (axial direction) of the tooth profile 3a during forging. A part of the large diameter part l
By folding it to the b side, there is excess material (as shown in Figure 6).
4 is likely to be formed adjacent to the tooth profile 3a. Therefore, the height of the extra thickness 4 is lowered by increasing the pressure during forging and applying strong pressure to the part where the extra thickness 4 is formed, but this requires a high forging load. There was a problem that not only the life of the mold was shortened, but also that the crank 5 was generated from the folded portion due to the strong pressure of the excess wall 4.
またこの余肉４は、上記公ｆＩｉにも図示されているよ
うに、切削加工を施して第７図に示すような形状を有す
る歯車３＃にすることによって除去できるものであるが
、余肉４を生じた分だけ歯車３′の段部の高さＨ′が高
くなるため、歯車３′の全長を短かくできないという問
題もあった。Further, as shown in the above-mentioned public fIi, this excess metal 4 can be removed by cutting to form the gear 3# having the shape shown in Fig. 7. 4, the height H' of the stepped portion of the gear 3' becomes higher by an amount corresponding to the height H' of the gear 3', and there is also the problem that the overall length of the gear 3' cannot be shortened.
（発明の目的）
そこで本発明は、低荷重で鍛造を行なっても上記余肉が
形成されにくい歯形部品の鍛造方法を提供することを目
的とする。(Objective of the Invention) Therefore, an object of the present invention is to provide a method for forging a tooth-shaped part in which the above-mentioned excess metal is difficult to form even when forging is performed under a low load.
（発明の構成）
本発明は、小径部と大径部とが同軸状に連接して段部を
形成する素材に、上記段部における大径部の面上におい
て小径部の外周面に隣接しかつこれを取囲む環状凹部を
予め形成しておき、鍛造時において歯形の歯筋方向から
の圧力によって生じる余肉を上記環状凹部内に逃すよう
にしたことを特徴とする。(Structure of the Invention) The present invention provides a material in which a small diameter portion and a large diameter portion are coaxially connected to form a stepped portion, and a material that is adjacent to the outer circumferential surface of the small diameter portion on the surface of the large diameter portion of the stepped portion. Further, an annular recess surrounding this is formed in advance, so that excess metal generated by pressure from the tooth trace direction of the tooth shape during forging is released into the annular recess.
（発明の効果）
本発明によれば、鍛造時の歯形成形により生じる余肉が
環状凹部内に入りこむため、歯形の歯丈が同一の場合は
従来のものより段部を低くすることができる。また、余
肉部分を強圧する必要がないので、素材の鍛造成形を低
荷重をもって行なうことができるから、型寿命の延長と
高精度化を図ることができる。さらに、余肉部分を強圧
しないで済むため、折れこみ部からのクランク発生を防
止することができる。(Effects of the Invention) According to the present invention, the excess material generated by the tooth formation shape during forging enters the annular recess, so that when the tooth height of the tooth profile is the same, the stepped portion can be made lower than that of the conventional one. Further, since there is no need to apply strong pressure to the excess thickness, the material can be forged with a low load, thereby extending the life of the mold and increasing precision. Furthermore, since there is no need to forcefully pressurize the excess thickness, it is possible to prevent cranking from occurring at the folded portion.
（実 施 例） 以下本発明の実施例について詳細に説明する。(Example) Examples of the present invention will be described in detail below.
第１図に示すように、小径部１ａと大径部１ｂとが同軸
状に連接して段部２を形成する素材１に、段部２におけ
る大径部１ｂの面Ａ上において小径部１ａの外周面Ｂに
隣接しかつこれを取囲む環状凹部６を予め形成しておく
。As shown in FIG. 1, on a material 1 in which a small diameter portion 1a and a large diameter portion 1b are coaxially connected to form a stepped portion 2, a small diameter portion 1a is placed on a surface A of a large diameter portion 1b of the stepped portion 2. An annular recess 6 adjacent to and surrounding the outer circumferential surface B is previously formed.
第２図は成形時の状態を示す鍛造金型の断面図で、１１
は上基盤、１２は受圧プレート、１３は受圧プレートホ
ルダーである。１４は上型ホルダーで、この上型ホルダ
ー１４の下面に上型１５が上型押え１６によって固定さ
れている。上型１５は、この金型によつて鍛造成形され
る歯車３の外径に対応した内径を有し、かつ歯車３の歯
形３ａに対応した歯形成形部１５ａをその内項面に備え
ている。１７は駆動シリンダ１８によって駆動されるノ
ックアウトピンで、受圧プレートホルダー１３、上型ホ
ルダー１４および上型１５を貫通して上型１５と同軸的
にかつ軸線方向（上下方向）に摺動可能に設けられてお
り、成形が終了すると駆動シリンダ１８によって駆動さ
れて上型１５内に突出し、成形された歯車３を上型１５
からエジェクトする。１９は上型１５の内径よりも僅か
に小さい外径を有する下パンチで、下パンチ押え２゜に
よって上基盤２１に固定されている。２２は駆動シリン
ダ２３によって駆動されるマンドレルで、上基盤２１お
よび下パンチ１９を貫通して下パンチ１９と同軸的にか
つ軸線方向（上下方向）に摺動可能に設けられており、
歯車３の内径に対応した外径を有する。Figure 2 is a cross-sectional view of the forging die showing the state during forming.
12 is a pressure receiving plate, and 13 is a pressure receiving plate holder. 14 is an upper mold holder, and an upper mold 15 is fixed to the lower surface of this upper mold holder 14 by an upper mold presser 16. The upper die 15 has an inner diameter corresponding to the outer diameter of the gear 3 to be forged by this die, and has a tooth forming portion 15a corresponding to the tooth profile 3a of the gear 3 on its inner face. . Reference numeral 17 denotes a knockout pin driven by a drive cylinder 18, which is provided so as to penetrate through the pressure receiving plate holder 13, the upper mold holder 14, and the upper mold 15 and to be able to slide coaxially with the upper mold 15 and in the axial direction (vertical direction). When the molding is completed, the gear 3 is driven by the drive cylinder 18 to protrude into the upper mold 15, and the molded gear 3 is moved into the upper mold 15.
eject from. A lower punch 19 has an outer diameter slightly smaller than the inner diameter of the upper die 15, and is fixed to the upper base plate 21 by a lower punch holder 2°. 22 is a mandrel driven by a drive cylinder 23, which is provided so as to penetrate the upper base plate 21 and the lower punch 19 and to be able to slide coaxially with the lower punch 19 and in the axial direction (vertical direction);
It has an outer diameter corresponding to the inner diameter of the gear 3.
このような鍛造金型を用いて素材ｌから歯車３を成形し
た場合、歯形３ａの歯筋方向からの圧力によって生じる
余肉４は上記素材１に予め形成しである環状凹部６内に
入りこむため、歯車３の段部２の高さＨを第６図の歯車
３′の段部２の高さよりも低くすることができる。しか
も余肉４部分を強圧しないで済むため、第６図における
ようなりランク５の発生を防止することができるのであ
る。When the gear 3 is formed from the material 1 using such a forging die, the extra metal 4 generated by pressure from the direction of the tooth trace of the tooth profile 3a enters the annular recess 6 formed in advance in the material 1. , the height H of the stepped portion 2 of the gear 3 can be made lower than the height of the stepped portion 2 of the gear 3' shown in FIG. Moreover, since it is not necessary to forcefully pressurize the 4 portions of excess thickness, occurrence of rank 5 as shown in FIG. 6 can be prevented.
第１図は本発明で用いられる鍛造素材の断面図、第２図
は鍛造金型の断面図、第３図は本発明によって得られる
成形品の断面図、第４図は従来の方法で用いられる鍛造
素材の断面図、第５図は成形品の理想的な形状を示す断
面図、第６図は従来の方法によって得られる成形品の断
面図、第７図は成形品に切削加工を施した状態を示す断
面図である。
１−・−素材 １ａ・−・小径部１ｂ・−
・・大径部 ２−・・段部３−歯車
３ａ・−・歯形４・・−・・余肉 ６
・・・−環状凹部１５・−・・・上型 １５
ａ・・−・歯形成形部特許出願人 マツダ株式会社
外１名代理人 弁理士 山 元 俊 仁
第１図
第３図
第４図
′−１′
第２図Fig. 1 is a sectional view of the forging material used in the present invention, Fig. 2 is a sectional view of the forging die, Fig. 3 is a sectional view of the molded product obtained by the present invention, and Fig. 4 is a sectional view of the forging material used in the conventional method. Fig. 5 is a cross-sectional view showing the ideal shape of the molded product, Fig. 6 is a cross-sectional view of the molded product obtained by the conventional method, and Fig. 7 is a cross-sectional view of the molded product obtained by cutting. FIG. 1-・-Material 1a・-・Small diameter part 1b・-
...Large diameter part 2--Stepped part 3-Gear
3a--Tooth profile 4--Excess thickness 6
---Annular recess 15 --- Upper mold 15
a...-Tooth formation part patent applicant Mazda Motor Corporation
One other representative Patent attorney Toshihito Yamamoto Figure 1 Figure 3 Figure 4'-1' Figure 2
Claims (1)
材の上記小径部に鍛造金型を用いた鍛造により歯形を形
成するようにした歯形部品の鍛造方法において、 上記素材に、上記段部における上記大径部の面上におい
て上記小径部の外周面に隣接しかつこれを取囲む環状凹
部を予め形成しておき、鍛造時において上記歯形の歯筋
方向からの圧力によって生じる余肉を上記環状凹部内に
逃すようにしたことを特徴とする歯形部品の鍛造方法。[Scope of Claims] Forging of a tooth-shaped part in which a tooth profile is formed by forging using a forging die in the small-diameter part of a material in which a small-diameter part and a large-diameter part are coaxially connected to form a stepped part. In the method, an annular recess that is adjacent to and surrounds the outer peripheral surface of the small diameter portion on the surface of the large diameter portion of the stepped portion is formed in advance in the material, and the tooth trace of the tooth profile is formed during forging. A method for forging a tooth-shaped part, characterized in that excess material generated by pressure from the direction is released into the annular recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3244487A JPH0722799B2 (en) | 1987-02-17 | 1987-02-17 | How to forge tooth profile parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3244487A JPH0722799B2 (en) | 1987-02-17 | 1987-02-17 | How to forge tooth profile parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63203240A true JPS63203240A (en) | 1988-08-23 |
| JPH0722799B2 JPH0722799B2 (en) | 1995-03-15 |
Family
ID=12359133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3244487A Expired - Lifetime JPH0722799B2 (en) | 1987-02-17 | 1987-02-17 | How to forge tooth profile parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722799B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05187521A (en) * | 1992-01-14 | 1993-07-27 | Oooka Giken Kk | Gear product |
| JP2014004591A (en) * | 2012-06-21 | 2014-01-16 | Aisin Aw Co Ltd | Mold for extrusion molding, method for manufacturing spline member, and spline member |
| CN110523903A (en) * | 2019-08-22 | 2019-12-03 | 重庆伊洛美克动力总成有限公司 | A kind of step tooth hub shaping mechanism and its forming method |
-
1987
- 1987-02-17 JP JP3244487A patent/JPH0722799B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05187521A (en) * | 1992-01-14 | 1993-07-27 | Oooka Giken Kk | Gear product |
| JP2014004591A (en) * | 2012-06-21 | 2014-01-16 | Aisin Aw Co Ltd | Mold for extrusion molding, method for manufacturing spline member, and spline member |
| CN110523903A (en) * | 2019-08-22 | 2019-12-03 | 重庆伊洛美克动力总成有限公司 | A kind of step tooth hub shaping mechanism and its forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0722799B2 (en) | 1995-03-15 |
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Legal Events
| Date | Code | Title | Description |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| EXPY | Cancellation because of completion of term |