【発明の詳細な説明】一産業上の利用分野−この発明は、自転車の車輪のハブ、紡績機械の糸巻きボ
ビン等として用いられる金属、特にアルミニウム合金製
の鍔付き中空軸の製造方法に関するものである。[Detailed Description of the Invention] One Industrial Field of Application - This invention relates to a method for manufacturing a flanged hollow shaft made of metal, particularly aluminum alloy, used as the hub of a bicycle wheel, the thread winding bobbin of a spinning machine, etc. be.
一従来の技術−自転車の車体の軽量化を図る為に、スポーツ用自転車の
車輪のハブにはアルミニウム合金製のハブが用いられて
いる。このハブには、中心に支軸を貫通させる中空孔が
設けられ、該中空孔の両端にはラッパ状に拡開したベア
リング受けが形成され、外周部両端にはスポークを連接
する鍔が形成されている。従来このアルミニウム合金製
のハブは、中実円筒状の材料の両端にすえ込み鍛造によ
り鍔を形成し、機械加工により中空孔を穿孔すると共に
内径及び外径の仕上げ加工を行って製造していた。1. Prior Art In order to reduce the weight of bicycle bodies, aluminum alloy hubs are used for the wheel hubs of sports bicycles. This hub is provided with a hollow hole in the center through which the spindle passes, a trumpet-shaped bearing receiver is formed at both ends of the hollow hole, and a collar for connecting spokes is formed at both ends of the outer periphery. ing. Conventionally, this aluminum alloy hub was manufactured by forming flanges on both ends of a solid cylindrical material by swaging forging, drilling a hollow hole by machining, and finishing the inner and outer diameters. .
また紡績機械に用いられる糸巻きボビンは、スピンドル
に嵌装される中空軸の両端に鍔を有する構造であり、従
来は金属製の中空軸の両端に板金ないしプラスチック板
で形成した鍔を固着して製作されている。Furthermore, the bobbins used in spinning machines have a structure in which a hollow shaft that is fitted into a spindle has flanges at both ends. Conventionally, flanges made of sheet metal or plastic plates are fixed to both ends of a hollow metal shaft. It is manufactured.
一発明が解決しようとする問題点−アルミニウム合金製の自転車のハブは、上記従来の製造
方法によると、製造コストがきわめて高価になるという
問題がある。特に近時の高級品指向により、学童用自転
車のハブにもアルミニウム製のものを用いたいという要
求があり、アルミニウム製のハブを安価に製造する技術
手段が要求されている。Problems to be Solved by the Invention - Bicycle hubs made of aluminum alloy have a problem in that the manufacturing cost is extremely high when the above-mentioned conventional manufacturing method is used. In particular, with the recent trend towards luxury products, there is a demand for the use of aluminum hubs for bicycles for school children, and there is a need for technical means for manufacturing aluminum hubs at low cost.
また糸巻きボビンは、多量に用いられるものであるから
、より安価に製造することができれば、ユーザの経済的
負担をそれだけ減少させることができる。Further, since thread-wound bobbins are used in large quantities, if they can be manufactured at a lower cost, the economic burden on the user can be reduced accordingly.
この発明は、上記要求を満たす技術手段を提供するもの
で、自転車のハブや糸巻きのボビンとして用いられる比
較的小径の中心孔を有する鍔付き中空軸を安価に製造す
る方法を得ることを目的としている。The present invention provides a technical means that satisfies the above requirements, and aims to provide a method for inexpensively manufacturing a flanged hollow shaft having a relatively small diameter center hole, which is used as a bicycle hub or a bobbin for thread winding. There is.
一問題点を解決するための手段−この発明では、金属、特にアルミニウム合金のパイプ１
を材料として、その両端に塑性加工により鍔１４を形成
している。Means for solving one problem - In this invention, a pipe made of metal, especially an aluminum alloy,
The collar 14 is formed by plastic working on both ends of the material.
まず、両端面を鍔成形面２１．２１とした保持体２でパ
イプ１の中央部を抱持し、第１工程で、パイプ１の両端
をラム３で軸方向に押圧し、パイプ１の両側に膨出部１
３を形成する。ラム３は、パイプの中空孔１１に嵌装さ
れる緩い円錐面を有するプラグ３１とパイプの端部１２
に当接する段部３２とを備えている。First, the central part of the pipe 1 is held by a holder 2 with both end surfaces having flange forming surfaces 21 and 21, and in the first step, both ends of the pipe 1 are pressed in the axial direction by a ram 3, and both ends of the pipe 1 are bulge part 1
form 3. The ram 3 includes a plug 31 having a loose conical surface that is fitted into a hollow hole 11 of the pipe and an end 12 of the pipe.
A step portion 32 that comes into contact with the step portion 32 is provided.
次に第２工程で、パイプ１の両端をダイス４で押圧し、
第１工程で形成した膨出部１３を保持体の鍔成形面２１
とダイスの鍔成形面４３との間で座屈展伸させて鍔１４
を形成している。ダイス４は、パイプの中空孔１１に丁
度嵌入される内径ガイド４１とパイプの端部１２を係止
する円周溝４２と前記鍔成形面４３とを備えている。Next, in the second step, both ends of the pipe 1 are pressed with the die 4,
The bulge 13 formed in the first step is attached to the flange forming surface 21 of the holder.
The collar 14 is buckled and stretched between the collar molding surface 43 of the die and the collar molding surface 43 of the die.
is formed. The die 4 includes an inner diameter guide 41 that fits into the hollow hole 11 of the pipe, a circumferential groove 42 that locks the end 12 of the pipe, and the flange forming surface 43.
−作用−上記第１工程では、ラム３の押圧力によりパイプ１に軸
方向の圧縮力が作用し、同時にプラグ３１でパイプ１の
両端が封止された状態でプラグ３１が中空孔１１内に挿
入されるので、中空孔１１内の空気が加圧され、パイプ
１に内圧が作用する。- Effect - In the first step, an axial compressive force is applied to the pipe 1 by the pressing force of the ram 3, and at the same time, the plug 31 is inserted into the hollow hole 11 with both ends of the pipe 1 sealed by the plug 31. Since it is inserted, the air inside the hollow hole 11 is pressurized, and internal pressure acts on the pipe 1.
この第１工程を水中で行ってやれば、パイプｌにより大
きな内圧を作用させることができる。パイプｌは、この
軸方向の圧縮力と内圧との合成力により膨出し、保持体
２で抱持されていない両側部に膨出部１３が形成される
のである。If this first step is carried out underwater, a greater internal pressure can be applied to the pipe l. The pipe 1 bulges due to the combined force of the axial compressive force and the internal pressure, and bulges 13 are formed on both sides not held by the holder 2.
第２工程では、膨出部１３を形成したパイプ１を更に軸
方向に大きな力で押圧することにより、膨出部１３を座
屈させて鍔１４を形成している。In the second step, the pipe 1 with the bulge 13 formed thereon is further pressed with a large force in the axial direction to buckle the bulge 13 and form the collar 14.
このとき、ダイス４の内径ガイド４１が中空孔１１に挿
入され、且つパイプ１の端面１２は円周溝４２で係止さ
れているので、膨出部１３は円滑に外側に向かって座屈
展伸し、保持体の鍔成形面２１とダイスの鍔成形面４３
との間で鍔１４が平板状に成形される。成形される鍔１
４の広さく径）は、保持体２からのパイプ１の突出長さ
しで決定され、冷間加工で材料の２．５倍程度の径の鍔
を成形することができる。At this time, the inner guide 41 of the die 4 is inserted into the hollow hole 11, and the end surface 12 of the pipe 1 is locked in the circumferential groove 42, so the bulge 13 is smoothly buckled and expanded outward. The flange forming surface 21 of the holder and the flange forming surface 43 of the die are stretched.
The collar 14 is formed into a flat plate shape between the two. Tsuba to be formed 1
4) is determined by the protruding length of the pipe 1 from the holder 2, and it is possible to form a flange with a diameter approximately 2.5 times that of the material by cold working.
成形された鍔付き中空軸の端部１２をパイプ１の元の径
より拡開する必要があれば、第１図に示すように、プラ
グ３１の根元の径をパイプ１の内径より大径としておけ
ば良い。ダイス４の円周溝４２の径は、プラグ３１の根
元の径に応じた径としておく。If it is necessary to expand the end 12 of the molded hollow shaft with flanges beyond the original diameter of the pipe 1, as shown in FIG. Just leave it there. The diameter of the circumferential groove 42 of the die 4 is set in accordance with the diameter of the root of the plug 31.
自転車のハブを製作する場合には、パイプ１の端部１２
を拡開したａ様で鍔付き中空軸１０を製造し、中空孔１
１の両端にプレス加工等により成形したベアリング受は
皿１５を嵌着してやれば良い。また糸巻きボビンを製造
するのであれば、端部１２を拡開させない態様で製造し
た鍔付き中空軸をそのまま用いれば良い。When manufacturing a bicycle hub, the end 12 of the pipe 1
A hollow shaft 10 with a flange is manufactured in a manner in which the hollow hole 1 is expanded.
A bearing receiver formed by press working or the like on both ends of the bearing plate 1 may be fitted with a plate 15. Moreover, if a thread-wound bobbin is to be manufactured, a flanged hollow shaft manufactured in such a manner that the end portion 12 is not expanded may be used as is.
一実施例−第１図はこの発明の第１実施例を示したもので、自転車
のハブの材料となる鍔付き中空軸１０（第２図）の製造
工程を第１工程（ａ） 、 （ｂ）と第２工程（ｃ）
、 （ｄ）の順に示したものである。One Embodiment - Fig. 1 shows a first embodiment of the present invention, in which the manufacturing process of a flanged hollow shaft 10 (Fig. 2), which is a material for a bicycle hub, is carried out in the first step (a), ( b) and second step (c)
, (d).
２は保持体で、材料となるアルミニウム合金製のパイプ
１を所定長さに切断し、その中央部を保持体２で抱持す
る。保持体２は、パイプ１の中心軸を含む面で二つ割れ
で、両側からパイプ１を抱持している。保持体２の両側
面は、平滑な平面に仕上げられて鍔成形面２１とされ、
鍔成形面２１の内径側には円錐面２２が設けられている
。Reference numeral 2 denotes a holder, which cuts a pipe 1 made of aluminum alloy to a predetermined length, and holds the central portion thereof with the holder 2. The holder 2 is split into two on a plane including the central axis of the pipe 1, and holds the pipe 1 from both sides. Both side surfaces of the holding body 2 are finished into smooth flat surfaces to form a flange forming surface 21,
A conical surface 22 is provided on the inner diameter side of the collar forming surface 21.
３はラムで、保持体２で抱持されたパイプ１の両端に向
けて進退する。ラム３及び後述するダイス４の進退機構
は、図には示されていないが、油圧シリンダその他の公
知の装置を用いてやれば良く、両側のラム３が同期して
進退する構造とする。A ram 3 moves forward and backward toward both ends of the pipe 1 held by the holder 2. Although not shown in the drawings, the mechanism for moving the rams 3 and the dice 4 to be described later may be achieved by using hydraulic cylinders or other known devices, and the rams 3 on both sides move back and forth in synchronization.
ラム３は、先端に円錐状のプラグ３１を備えており、プ
ラグ３１の根元に段部３２が形成されている。プラグ３
１の先端径は、パイプ１の内径より僅かに小径で、根元
の径はパイプｌの外径と略等しくしである（第１図（ａ
））。The ram 3 includes a conical plug 31 at its tip, and a stepped portion 32 is formed at the base of the plug 31. plug 3
The diameter of the tip of pipe 1 is slightly smaller than the inner diameter of pipe 1, and the diameter of the base is approximately equal to the outer diameter of pipe 1 (see Figure 1 (a).
)).
ラム３をパイプ１の両端に向けて進出させると、プラグ
３１の先端が中空孔１１に挿入されて中空孔１１の両端
を封止する。ラム３を更に進出させると、プラグ３１は
、パイプ１の端部１２を拡開させながら中空孔１１に挿
入され、パイプ１の端部１２が段部３２に衝突する。こ
のとき、プラグ３１の挿入により、中空孔１１内の圧力
が上昇する。そしてラム３を更に僅かに進出させること
により、パイプ１に軸方向の圧縮力が作用し、中空孔１
１の内圧の作用とあいまって、保持体２から突出してい
るパイプ１の両側部に膨出部１３が形成される（第１図
（ｂ））。When the ram 3 is advanced toward both ends of the pipe 1, the tip of the plug 31 is inserted into the hollow hole 11 to seal both ends of the hollow hole 11. When the ram 3 is advanced further, the plug 31 is inserted into the hollow hole 11 while expanding the end 12 of the pipe 1, and the end 12 of the pipe 1 collides with the step 32. At this time, the pressure inside the hollow hole 11 increases due to the insertion of the plug 31. Then, by further advancing the ram 3 slightly, compressive force in the axial direction acts on the pipe 1, and the hollow hole 1
Combined with the action of the internal pressure 1, bulges 13 are formed on both sides of the pipe 1 protruding from the holder 2 (FIG. 1(b)).
次にラム３を後退させ、保持体２を移動させてパイプ１
を第２工程に送る。第２工程には、保持体２で支持され
たパイプ１の両端に向けて進退するダイス４が設けられ
ている。このダイス４は、先端部の径がパイプ１の元の
内径と等しく且つ根元の径が前記プラグ３１の根元の径
と等しい内径ガイド４１を有しており、内径ガイド４１
の根元には円周溝４２が設けられ、円周溝４２の外側に
平滑な鍔成形面４３を備えている（第１図（Ｃ））。Next, the ram 3 is moved backward, the holder 2 is moved, and the pipe 1
is sent to the second process. In the second step, a die 4 that moves forward and backward toward both ends of the pipe 1 supported by the holder 2 is provided. This die 4 has an inner diameter guide 41 whose tip end diameter is equal to the original inner diameter of the pipe 1 and whose base diameter is equal to the diameter of the base of the plug 31.
A circumferential groove 42 is provided at the base of the groove 42, and a smooth collar forming surface 43 is provided on the outside of the circumferential groove 42 (FIG. 1(C)).
ダイス４をパイプ１の両側に向けて進出させると、まず
内径ガイド４１がパイプの中空孔１１に挿入され、パイ
プ１の端部１２が円周溝４２に嵌装されて係止される。When the die 4 is advanced toward both sides of the pipe 1, the inner diameter guide 41 is first inserted into the hollow hole 11 of the pipe, and the end portion 12 of the pipe 1 is fitted into the circumferential groove 42 and locked.
この状態で更にダイス４を進出させることにより、第１
工程で形成した膨出部工３が外側に向けて座屈して展伸
され、保持体の鍔成形面２１とダイスの鍔成形面４３と
の間で該座屈部が挟着成形されて鍔１４が形成される（
第１図（ｄ））。In this state, by further advancing dice 4, the first
The bulging part 3 formed in the process is buckled and expanded outward, and the buckled part is sandwiched and formed between the flange forming surface 21 of the holder and the flange forming surface 43 of the die to form the flange. 14 is formed (
Figure 1(d)).
このようにして製作された鍔付き中空軸１０の中空孔１
１の両端に銅鉄製のベアリング受は皿１５を嵌装固着し
て自転車のハブ１６を製作する（第２図）。Hollow hole 1 of the flanged hollow shaft 10 manufactured in this way
A bicycle hub 16 is manufactured by fitting and fixing plates 15 into copper-iron bearing holders at both ends of the hub 1 (FIG. 2).
第３図は、糸巻きボビン用の鍔付き中空軸を製造する工
程を第１図の（ｂ）と（ｄ）に対応する工程で示したも
ので、パイプ１の両端を拡開しない態様の製造工程が示
されている。以下、第１図と異なる点についてのみ説明
する。FIG. 3 shows the process of manufacturing a flanged hollow shaft for a thread-wound bobbin in a manner corresponding to (b) and (d) in FIG. 1, in which both ends of the pipe 1 are not expanded. The process is shown. Hereinafter, only the points different from FIG. 1 will be explained.
保持体２は、その鍔成形面２１の内径側に円錐面を有し
ていない。ラム３のプラグ３１は、先端に短い円錐部３
３を有し、その根元側は円筒形で、該円筒部３４の径は
パイプ１の内径より僅かに大きい。ダイス４の内径ガイ
ド４１は、パイプ１の内径と等しい円筒形とされている
。The holder 2 does not have a conical surface on the inner diameter side of the flange molding surface 21. The plug 31 of the ram 3 has a short conical portion 3 at the tip.
3, the base side of which is cylindrical, and the diameter of the cylindrical portion 34 is slightly larger than the inner diameter of the pipe 1. The inner diameter guide 41 of the die 4 has a cylindrical shape that is equal to the inner diameter of the pipe 1.
ラム３がパイプの中空孔１１に挿入されると、プラグの
円錐部３３が挿入された時点で中空孔１１は封止され、
その後円筒部３４が挿入されることによって、パイプｌ
の端部１２が拡開されない状態で中空孔１１の圧力が上
昇する。その後の各工程における作用は、第１図のもの
と同様である。When the ram 3 is inserted into the hollow hole 11 of the pipe, the hollow hole 11 is sealed when the conical part 33 of the plug is inserted.
Thereafter, by inserting the cylindrical portion 34, the pipe l
The pressure in the hollow hole 11 increases while the end portion 12 of the hollow hole 11 is not expanded. The operations in each of the subsequent steps are similar to those in FIG.
−発明の効果−上記この発明の方法によると、自転車の車輪のハブや糸
巻きボビンを製造するための鍔付き中空軸をきわめて安
価に且つ能率良く製造することができる。例えばアルミ
ニウム合金製の自転車のハブであれば、従来方法の約１
／２のコストで製作することができ、製造時間も大幅に
短縮され、製造するための設備も簡単な構造の装置で済
む。また第１工程でパイプを軸方向に押圧して膨出部を
形成する方法を採用しているので、能率的であるばかり
でなく、細いパイプに鍔を形成することも容易にできる
。-Effects of the Invention- According to the method of the present invention described above, a flanged hollow shaft for manufacturing a bicycle wheel hub or a thread-wound bobbin can be manufactured very efficiently and at low cost. For example, in the case of a bicycle hub made of aluminum alloy, the conventional method
It can be manufactured at a cost of /2, the manufacturing time is significantly shortened, and the manufacturing equipment requires only a device with a simple structure. Furthermore, since the method of forming the bulge by pressing the pipe in the axial direction in the first step is not only efficient, but also allows easy formation of a flange on a thin pipe.
第１図はこの発明の第１実施例を第１工程（ａ）、（ｂ
）と第２工程（ｃ）、（ｄ）の順に示した断面図、第２
図はこの発明方法により製作された鍔付き中空軸からな
る自転車の車輪のハブを示す断面図、第３図は第２実施
例を第１図の（ｂ） 、 （ｄ）に対応する工程で示し
た断面図である。図中、１：パイプ １０：鍔付き中空軸１１：パイ
プの中空孔 １２：パイプの端部１３：膨出部
１４：鍔２：保持体 ２１：鍔成形面３：ラム
３１ニブラグ３２：段部 ４：ダイス４１：内径ガイド ４２：円周溝４３：鍔成形面FIG. 1 shows the first embodiment of the present invention in the first steps (a) and (b).
) and second steps (c) and (d) in order, the second
The figure is a sectional view showing a bicycle wheel hub made of a flanged hollow shaft manufactured by the method of the present invention, and FIG. 3 shows the second embodiment in the steps corresponding to (b) and (d) in FIG. FIG. In the figure, 1: pipe 10: hollow shaft with flange 11: hollow hole of pipe 12: end of pipe 13: bulging part
14: Tsuba 2: Holder 21: Tsuba molding surface 3: Ram
31 Nib Lug 32: Step 4: Die 41: Inner diameter guide 42: Circumferential groove 43: Flange forming surface
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29099386AJPS63144827A (en) | 1986-12-06 | 1986-12-06 | Manufacture of flanged hollow shaft |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29099386AJPS63144827A (en) | 1986-12-06 | 1986-12-06 | Manufacture of flanged hollow shaft |
| Publication Number | Publication Date |
|---|---|
| JPS63144827Atrue JPS63144827A (en) | 1988-06-17 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29099386APendingJPS63144827A (en) | 1986-12-06 | 1986-12-06 | Manufacture of flanged hollow shaft |
| Country | Link |
|---|---|
| JP (1) | JPS63144827A (en) |
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