JPH06226385A - Teeth forming die for cylindrical body - Google Patents
Teeth forming die for cylindrical bodyInfo
- Publication number
- JPH06226385A JPH06226385A JP1753493A JP1753493A JPH06226385A JP H06226385 A JPH06226385 A JP H06226385A JP 1753493 A JP1753493 A JP 1753493A JP 1753493 A JP1753493 A JP 1753493A JP H06226385 A JPH06226385 A JP H06226385A
- Authority
- JP
- Japan
- Prior art keywords
- tooth
- punch
- work
- ridge
- tooth surface
- 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
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、板金製の円筒形のワー
クに、歯車又はスプラインの歯形を成形するための金型
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for forming a tooth profile of a gear or a spline on a cylindrical work made of sheet metal.
【０００２】[0002]
【従来の技術】この種の金型でワークを成形すると、歯
形の歯面の大部分は正確に成形されるが、歯面と歯頂面
の境界の稜線部の成形が不完全になり易く、稜線部が丸
味をもち、有効な歯面の長さが所定値より短くなる不都
合がある。2. Description of the Related Art When a work is molded with this type of mold, most of the tooth surface of the tooth profile is accurately molded, but the ridge line at the boundary between the tooth surface and the tooth top surface is likely to be incomplete. However, there is a problem that the ridge has a rounded shape and the effective tooth surface length is shorter than a predetermined value.
【０００３】この点を改善するものとして実開昭５３−
３６３３３の考案が知られており、該考案の装置におい
ては、パンチ側の歯面成形部の両側に小突条を分岐させ
て、歯面成形部と小突条で稜線部成形用の凹条を形成
し、パンチでワークを加圧したとき、小突条で凹条内に
肉寄せをして稜線部を正確に成形するようにしている。
しかし、この装置においては、凹条を拡げる方向の過大
な負荷が小突条に作用し、小突条又は凹条にクラックが
生じるおそれがある。また、この装置における前記凹条
は、歯頂面より下まで圧入されるから、実質上の歯丈は
小さく形成される。As a means for improving this point, the actual exploitation sho 53-
In the device of the invention, a small ridge is branched on both sides of the tooth surface forming portion on the punch side, and a concave line for forming a ridge portion is formed by the tooth surface forming portion and the small ridge. When the work is pressed with a punch, the small ridges are used to bring the ridges into the recesses so that the ridge line portion is accurately formed.
However, in this device, an excessive load in the direction of expanding the concave strip may act on the small strip, and the small strip or the recess may be cracked. In addition, since the concave streak in this device is press-fitted below the tooth top surface, the tooth height is substantially reduced.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、稜線部を含
めて歯形全体を正確に成形でき、かつ耐久性のある金型
を得ることを課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to obtain a mold which is capable of accurately molding the entire tooth profile including the ridge portion and which is durable.
【０００５】[0005]
【課題を解決するための手段】本発明における前記課題
の解決手段は、外周に多数の谷部と山部を交互に備える
芯金に円筒体のワークを嵌合し、前記谷部と協同する歯
面加圧部を先端に備えた多数のパンチを、芯金に向けて
一斉に進退させる円筒体用歯形成形金型において、芯金
の山部の両側の肩に該山部の頂面より僅かに高い突条を
設け、パンチには小円弧状の隅角部を介して歯面加圧部
と頂部加圧部を設けたことを特徴とする。Means for Solving the Problems According to the means for solving the above problems in the present invention, a cylindrical work is fitted to a cored bar having a large number of valleys and peaks alternately on the outer periphery, and cooperates with the valleys. A tooth-forming mold for a cylindrical body that advances and retreats a large number of punches equipped with tooth surface pressing parts at the tip toward the core metal at the same time. It is characterized in that a slightly high ridge is provided, and the punch is provided with a tooth surface pressing portion and a top pressing portion via small arc-shaped corner portions.
【０００６】[0006]
【作用】前記の手段において、パンチを前進させたと
き、芯金の谷部とパンチの歯面加圧部の間でワークに歯
面が成形され、かつ芯金の突条とパンチの頂部加圧部の
間で稜線部が形成される。この際、ワークの稜線部は、
前記突条によってパンチの隅角部に強く押圧されるの
で、正確な稜線が成形される。In the above means, when the punch is advanced, the tooth surface is formed on the work between the trough portion of the core metal and the tooth surface pressing portion of the punch, and the protrusion of the core metal and the top portion of the punch are applied. Ridge portions are formed between the pressure portions. At this time, the ridge of the work is
Since the ridges strongly press the corners of the punch, accurate ridges are formed.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面と共に説明す
る。図１において、１は板金製のワークで本発明の金形
で成形されるものであり、歯形部２とフランジ３を備
え、歯形部２は、歯面部２ａ、歯頂部２ｂ、歯底部２ｃ
からなり、歯頂部２ｂの両側に稜線２ｄが形成されてい
る。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a work made of sheet metal, which is molded by the mold of the present invention, and includes a tooth profile portion 2 and a flange 3. The tooth profile portion 2 includes a tooth surface portion 2a, a tooth top portion 2b, and a tooth bottom portion 2c.
And ridge lines 2d are formed on both sides of the tooth top portion 2b.
【０００８】図２、図３において、４は本発明の金型で
下型４ａと上型４ｂからなり、下型４ａの台板５には、
縦方向に伸びる谷部７と山部８をもつ芯金６が固定さ
れ、その周囲には、谷部７又は山部８と同数のパンチ９
が放射方向に進退自在に配置されている。このパンチ９
の上面外方には外向きに傾斜したカム１０が形成されて
いる。2 and 3, reference numeral 4 denotes a mold of the present invention, which is composed of a lower mold 4a and an upper mold 4b, and a base plate 5 of the lower mold 4a is
A core metal 6 having a valley portion 7 and a mountain portion 8 extending in the vertical direction is fixed, and the same number of punches 9 as the valley portion 7 or the mountain portion 8 is provided around the core metal 6.
Are arranged so that they can move back and forth in the radial direction. This punch 9
A cam 10 inclined outward is formed on the outer side of the upper surface of the.
【０００９】上型４ｂの加圧板１１には、ワーク１を芯
金６上に押さえるパッド１２がバネ１３と共に中心に設
けられ、外周に前記カム１０と協同するカム１４が固定
されている。On the pressure plate 11 of the upper die 4b, a pad 12 for pressing the work 1 on the cored bar 6 is provided at the center together with a spring 13, and a cam 14 cooperating with the cam 10 is fixed to the outer periphery.
【００１０】図４で示すように、芯金６の山部８の肩に
は、山部８の頂面８ａより僅かに高い突条１５、１５が
ワーク１の背面に食い込むように突設されている。一
方、パンチ９には、芯金６の谷部７に対向する山形の歯
面加圧部１６と、山部８に対向する平坦な頂部加圧部１
７が各１個設けられ、両部分は小円弧状の隅角部１８で
連続している。そして、パンチ９の最前進位置で一つの
パンチ９の歯面加圧部１６と隣のパンチ９の頂部加圧部
１７が密着するようになっている。As shown in FIG. 4, ridges 15, 15 slightly higher than the top surface 8a of the ridge portion 8 are provided on the shoulder of the ridge portion 8 of the core metal 6 so as to bite into the back surface of the work 1. ing. On the other hand, the punch 9 has a chevron-shaped tooth surface pressing portion 16 facing the trough portion 7 of the core metal 6 and a flat top pressing portion 1 facing the trough portion 8.
One piece 7 is provided for each, and both parts are continuous with a small arc-shaped corner portion 18. At the most advanced position of the punch 9, the tooth surface pressing portion 16 of one punch 9 and the top pressing portion 17 of the adjacent punch 9 come into close contact with each other.
【００１１】この金型４において、芯金６に円筒体の部
分をもつワーク１を嵌合させて加圧板１１を下降させる
と、カム１４がパンチ９のカム１０を押して各パンチ
９、９…を一斉に前進させ、歯面加圧部１６がワーク１
の対向する部分を谷部７に押込み、歯面加圧部１６のく
さび作用で歯面部２ａに強大な成形圧力を作用させ、正
確な歯面が成形される。これより少し遅れて、頂部加圧
部１７がワーク１の他の部分を山部８の頂面８ａに向け
て加圧し、このとき、山部８の両側の肩に突設された突
条１５によって該突条１５付近の肉に強大な加圧力が発
生し、この部分の肉は、小円弧状の隅角部１８内に隙間
なく押込まれ、正確な稜線２ｄが形成される。これによ
り設計値どおりの歯面の高さａをもつ歯形を成形するこ
とができる。In this die 4, when the work 1 having a cylindrical portion is fitted to the cored bar 6 and the pressure plate 11 is lowered, the cam 14 pushes the cam 10 of the punch 9 to punch each of the punches 9, 9, ... All at once, and the tooth surface pressing unit 16 moves the workpiece 1
The opposing portions of are pressed into the troughs 7 and the wedge action of the tooth surface pressing portion 16 applies a great forming pressure to the tooth surface portion 2a to form an accurate tooth surface. A little later than this, the top pressing portion 17 presses the other part of the work 1 toward the top surface 8a of the ridge 8, and at this time, the ridges 15 projecting from the shoulders on both sides of the ridge 8 As a result, a strong pressing force is generated in the meat in the vicinity of the ridge 15, and the meat in this portion is pressed into the small arc-shaped corner portion 18 without a gap, and an accurate ridge line 2d is formed. This makes it possible to form a tooth profile having a tooth surface height a as designed.
【００１２】この実施例において、各突条１５に矢印方
向の加圧力は生じるが、これと直交する方向の加圧力は
左右バランスするから突条１５に曲げが作用せず、突条
１５の側部や基部にクラックが入るおそれはない。ま
た、一つのパンチ９に一つだけの歯面加圧部１６を設け
ているので、前進時に歯面加圧部１６にも横方向の曲げ
が作用せず、その破損のおそれは少い。しかし、小さい
力で成形できる加工条件であれば前記パンチ９の２〜３
個を一体とした構造のパンチを用いることができる。In this embodiment, a pressing force in the direction of the arrow is generated on each of the ridges 15, but the pressing force in the direction orthogonal to this is balanced left and right, so that the ridges 15 do not bend and the ridges 15 side. There is no risk of cracks in the base or base. Further, since only one tooth surface pressing portion 16 is provided for each punch 9, lateral bending is not applied to the tooth surface pressing portion 16 during forward movement, and there is little risk of damage. However, as long as the processing conditions allow molding with a small force, the punch 9 has two or three
A punch having a structure in which individual pieces are integrated can be used.
【００１３】[0013]
【発明の効果】以上のように、芯金の山部の両側の肩に
山部の頂面より僅かに高い突条を設けたので、ワークを
パンチで加圧した際に、ワークの肉を、パンチの歯面加
圧部と頂部加圧部の間の隅角部に圧入することができ、
正確な稜線をもつ歯形が成形できる点を有する。その
上、前記突条には横方向の曲げが殆ど作用しないので、
クラックが生じるおそれがない。As described above, since the ridges slightly higher than the top surface of the crest are provided on the shoulders on both sides of the crest of the core metal, the meat of the work is prevented when the work is pressed by the punch. , It can be pressed into the corner between the tooth surface pressure part and the top pressure part of the punch,
It has a point where a tooth profile with precise ridges can be formed. Moreover, since lateral bending hardly acts on the ridge,
There is no risk of cracks.
【図面の簡単な説明】[Brief description of drawings]
【図１】 本発明の金型で加工したワークの斜視図FIG. 1 is a perspective view of a work processed by a mold of the present invention.
【図２】 本発明の実施例の縦断面図FIG. 2 is a vertical sectional view of an embodiment of the present invention.
【図３】 同上下型の平面図FIG. 3 is a plan view of the upper and lower molds.
【図４】 図３のＡ部の拡大図FIG. 4 is an enlarged view of part A in FIG.
１ ワーク ２ａ 歯面部 ２ｂ 歯頂部 ２ｄ 稜線 ６ 芯金 ７ 谷部 ８ 山部 ８ａ 頂面 ９ パンチ １５ 突条 １６ 歯面加圧部 １７ 頂部
加圧部 １８ 隅角部1 Work 2a Tooth surface part 2b Tooth top part 2d Ridge line 6 Core bar 7 Valley part 8 Crest part 8a Top surface 9 Punch 15 Ridge 16 Tooth surface pressing part 17 Top pressing part 18 Corner part
Claims (1)
交互に備える芯金（６）に円筒体のワーク（１）を嵌合
し、前記谷部（７）と協同する歯面加圧部（１６）を先
端に備えた多数のパンチ（９）を、芯金（６）に向けて
一斉に進退させる円筒体用歯形成形金型において、芯金
（６）の山部（８）の両側の肩に該山部（８）の頂面
（８ａ）より僅かに高い突条（１５）を設け、パンチ
（９）には小円弧状の隅角部（１８）を介して歯面加圧
部（１６）と頂部加圧部（１７）を設けたことを特徴と
する、円筒体用歯形成形金型。1. A cylindrical work (1) is fitted to a cored bar (6) having a plurality of troughs (7) and crests (8) alternately on the outer periphery, and cooperates with the troughs (7). In a tooth-forming mold for a cylindrical body, in which a large number of punches (9) equipped with tooth surface pressing portions (16) at their tips are moved toward and away from the cored bar (6) all at once, a mountain of the cored bar (6) Protrusions (15) slightly higher than the top surface (8a) of the mountain portion (8) are provided on the shoulders on both sides of the portion (8), and the punch (9) is provided with a small arc-shaped corner portion (18). A tooth forming mold for a cylindrical body, characterized in that a tooth surface pressing part (16) and a top pressing part (17) are provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1753493A JP2652921B2 (en) | 1993-02-04 | 1993-02-04 | Tooth forming mold for cylindrical body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1753493A JP2652921B2 (en) | 1993-02-04 | 1993-02-04 | Tooth forming mold for cylindrical body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06226385A true JPH06226385A (en) | 1994-08-16 |
| JP2652921B2 JP2652921B2 (en) | 1997-09-10 |
Family
ID=11946596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1753493A Expired - Fee Related JP2652921B2 (en) | 1993-02-04 | 1993-02-04 | Tooth forming mold for cylindrical body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2652921B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6868607B2 (en) * | 2000-11-16 | 2005-03-22 | Koyo Seiko Co., Ltd. | Electric power steering apparatus and method of manufacturing gear used therefor |
-
1993
- 1993-02-04 JP JP1753493A patent/JP2652921B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6868607B2 (en) * | 2000-11-16 | 2005-03-22 | Koyo Seiko Co., Ltd. | Electric power steering apparatus and method of manufacturing gear used therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2652921B2 (en) | 1997-09-10 |
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