JPH01148682A - Manufacture of front fork for bicycle made of carbon fiber reinforced resin - Google Patents
Manufacture of front fork for bicycle made of carbon fiber reinforced resinInfo
- Publication number
- JPH01148682A JPH01148682A JP62304557A JP30455787A JPH01148682A JP H01148682 A JPH01148682 A JP H01148682A JP 62304557 A JP62304557 A JP 62304557A JP 30455787 A JP30455787 A JP 30455787A JP H01148682 A JPH01148682 A JP H01148682A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- hollow mandrel
- prepreg
- front fork
- laminated
- 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
- 239000011347 resin Substances 0.000 title claims abstract description 44
- 229920005989 resin Polymers 0.000 title claims abstract description 44
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 26
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 23
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 23
- 238000000465 moulding Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 210000000078 claw Anatomy 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 abstract description 10
- 238000005470 impregnation Methods 0.000 abstract 4
- 238000004804 winding Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229920002379 silicone rubber Polymers 0.000 description 4
- 239000004945 silicone rubber Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は炭素繊維強化樹脂製自転車用前ホークの製造方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a bicycle front fork made of carbon fiber reinforced resin.
（従来の技術）
炭素繊維強化樹脂製パイプは、自転車のフレーム用パイ
プ、釣り竿、ゴルフシャフト等に広く使用されている。(Prior Art) Carbon fiber reinforced resin pipes are widely used in bicycle frame pipes, fishing rods, golf shafts, and the like.
その製造に当たっては、中実のマンドレル（ストレート
状またはテーパー状の芯金）に離型剤を塗布し１次いで
炭素繊維に熱硬化性樹脂を含浸させて得られたプリプレ
グの複数枚を同中実のマンドレルの周りに積層状態に巻
き付け３次いで同積層プリプレグを熱硬化樹脂の硬化温
度まで加熱して、硬化させ２次いで同炭素繊維強化樹脂
製パイプを上記中実のマンドレルから抜き取って、所定
寸法に仕上げ加工するようにしている。In its production, a mold release agent is applied to a solid mandrel (straight or tapered core metal), and then multiple sheets of prepreg obtained by impregnating carbon fiber with a thermosetting resin are mixed into the same solid mandrel. The prepreg is then wrapped around the mandrel in a laminated state.3 The laminated prepreg is then heated to the curing temperature of the thermosetting resin and cured.2 The carbon fiber reinforced resin pipe is then pulled out from the solid mandrel and cut to a predetermined size. I am trying to finish it.
（発明が解決しようとする問題点）
前記中実のマンドレルでは、形状の比較的筒車な直線状
の炭素繊維強化樹脂製パイプ、例えば自転車のフレーム
用パイプ、釣り竿、ゴルフシャフト等は所定の形状に成
形できても、形状の複雑な自転車用前ホーク、即ち、断
面楕円形のテーパー管を側面視弧状に湾曲させた状態の
自転車用前ホークは成形し難＜、そのため、従来は、中
空のシリコンゴムの中空部に圧力空気を供給して、加圧
する方向を採用しているが、この場合には、圧力空気供
給装置等を必要として、設備費を高めるという問題があ
った。(Problems to be Solved by the Invention) In the solid mandrel, straight carbon fiber-reinforced resin pipes with a relatively hourly shape, such as bicycle frame pipes, fishing rods, golf shafts, etc., have a predetermined shape. However, it is difficult to form a bicycle front fork with a complex shape, that is, a tapered tube with an oval cross section curved into an arc shape when viewed from the side. Therefore, conventionally, a hollow The method of supplying pressurized air to the hollow part of the silicone rubber to pressurize it is adopted, but in this case, there is a problem that a pressurized air supply device or the like is required, which increases the equipment cost.
（問題点を解決するための手段）
本発明は前記の問題点に対処するもので、断面楕円形の
テーパー管を側面視弧状に湾曲させた状態の炭素繊維強
化樹脂製自転車用前ホーク足を製造するに当たり、炭素
繊維に熱硬化性樹脂を含浸させて得られたプリプレグを
耐熱性及び離型性を有する可撓材製中空マンドレルの周
りに積層状態に巻き付け９次いで同積層プリプレグと同
中空マンドレルとを離接可能な金型内にセットし１次い
で同金型を閉じて、同金型の成形部面を上記プリプレグ
に押し付け、上記中空マンドレルを楕円形に弾性変形さ
せて、上記積層プリプレグを側面視弧状の且つ断面楕円
形のパイプ状に成形し且つ同金型を熱硬化樹脂の硬化温
度まで加熱して、上記積層プリプレグを硬化させ１次い
で上記金型を離型し、上記成形後の積層プリプレグと上
記可撓材製中空マンドレルとを同金型から取り出して、
同可撓材製中空マンドレルを成形後の積層プリプレグか
ら抜き取ることを特徴としている。(Means for Solving the Problems) The present invention addresses the above-mentioned problems, and provides a front fork leg for a bicycle made of carbon fiber reinforced resin in which a tapered tube with an elliptical cross section is curved in an arc shape when viewed from the side. In manufacturing, the prepreg obtained by impregnating carbon fiber with a thermosetting resin is wrapped in a laminated state around a hollow mandrel made of a flexible material having heat resistance and mold releasability.9 Then, the same laminated prepreg and the same hollow mandrel are wrapped. and are set in a mold that can be separated and separated, and then the mold is closed, and the molded surface of the mold is pressed against the prepreg, and the hollow mandrel is elastically deformed into an elliptical shape to form the laminated prepreg. The laminated prepreg is molded into a pipe shape having an arcuate shape in side view and an elliptical cross section, and the mold is heated to the curing temperature of the thermosetting resin to cure the laminated prepreg, and then the mold is released. The laminated prepreg and the hollow mandrel made of flexible material are taken out of the same mold,
The feature is that the hollow mandrel made of the flexible material is extracted from the laminated prepreg after molding.
また本発明は断面楕円形のテーパー管を側面視弧状に湾
曲させた状態の炭素繊維強化樹脂製自転車用前ホーク足
の先端に前ホークつめを有する前ホーク足を製造するに
当たり、アタッチメントの端部を耐熱性及び離型性を有
する可撓材製中空マンドレルの一端開口部内に挿入し１
次いで炭素繊維に熱硬化性樹脂を含浸させて得られたプ
リプレグを上記中空マンドレル及び上記アタッチメント
の周りに積層状態に巻き付け１次いで上記アタッチメン
トを抜き取って、前ホークつめの端部を上記中空マンド
レルの一端開口部内に挿入し１次いで同積層プリプレグ
と同前ホークつめと同中空マンドレルとを離接可能な金
型内にセットし９次いで同金型を閉じて、同金型の成形
部面を上記プリプレグに押し付け、上記可撓材製中空マ
ンドレルを楕円形に弾性変形させて、上記積層プリプレ
グを側面視弧状の且つ断面楕円形のパイプ状に成形する
とともに同積層プリプレグの先端部を上記前ホークつめ
の端部に接合して互いを一体化し且つ同金型を熱硬化樹
脂の硬化温度まで加熱して、上記積層プリプレグを硬化
させ１次いで上記金型を離型し、上記成形後の積層プリ
プレグと上記前ホークつめと上記中空マンドレルとを同
金型から取り出して、同中空マンドレルを成形後の積層
プリプレグから抜き取ることを特徴としている。In addition, the present invention provides a front fork leg for a bicycle made of carbon fiber reinforced resin in which a tapered tube with an elliptical cross section is curved into an arc shape when viewed from the side, and has a front fork pawl at the tip of the fork leg. is inserted into the opening at one end of a hollow mandrel made of a flexible material having heat resistance and mold releasability.
Next, a prepreg obtained by impregnating carbon fiber with a thermosetting resin is wrapped around the hollow mandrel and the attachment in a laminated state. Next, the attachment is pulled out and the end of the front hawk claw is attached to one end of the hollow mandrel. Insert the laminated prepreg into the opening, set the same laminated prepreg, the front fork pawl, and the hollow mandrel in a mold that can be moved in and out. The hollow mandrel made of flexible material is elastically deformed into an elliptical shape to form the laminated prepreg into a pipe shape having an arc shape in side view and an elliptical cross section, and the tip of the laminated prepreg is attached to the front fork pawl. The end portions are joined to integrate each other, and the same mold is heated to the curing temperature of the thermosetting resin to cure the laminated prepreg, and then the mold is released, and the laminated prepreg after the molding and the above The method is characterized in that the front fork pawl and the hollow mandrel are taken out from the same mold, and the hollow mandrel is extracted from the laminated prepreg after molding.
本発明の目的とする処は、形状の複雑な炭素繊維強化樹
脂製自転車用前ホーク、即ち、断面楕円形のテーパー管
を側面視弧状に湾曲させた状態の自転車用前ホークを圧
力空気供給装置等を必要とせずに製造できて、設備費を
低減できる自転車用前ホークの製造方法を供する点にあ
る。The object of the present invention is to use a bicycle front fork made of carbon fiber reinforced resin with a complicated shape, that is, a bicycle front fork in which a tapered tube with an oval cross section is curved in an arc shape when viewed from the side, as a pressurized air supply device. To provide a method for manufacturing a front fork for a bicycle, which can be manufactured without requiring the like and can reduce equipment costs.
（作用）
炭素繊維強化樹脂製自転車用前ホーク足を製造するとき
には、炭素繊維に熱硬化性樹脂を含浸させて得られたプ
リプレグを耐熱性及び耐熱性を有する可撓材製中空マン
ドレルの周りに積層状態に巻き付け２次いで同積層プリ
プレグと同中空マンドレルとを離接可能な金型内にセッ
トし２次いで同金型を閉じて、同金型の成形部面を上記
プリプレグに押し付け、上記中空マンドレルを楕円形に
弾性変形させて、上記積層プリプレグを側面視弧状の且
つ断面楕円形のパイプ状に成形し且つ同金型を熱硬化樹
脂の硬化温度まで加熱して、上記積層プリプレグを硬化
させ２次いで上記金型を離型し、上記成形後の積層プリ
プレグと上記中空マンドレルとを同金型から取り出して
、同中空マンドレルを成形後のａＦＪプリプレグから抜
き取る。(Function) When manufacturing carbon fiber-reinforced resin bicycle front fork legs, prepreg obtained by impregnating carbon fiber with thermosetting resin is wrapped around a hollow mandrel made of a heat-resistant and heat-resistant flexible material. 2. Next, the laminated prepreg and the hollow mandrel are set in a mold that can be separated from the laminated prepreg, and the mold is closed, the molded surface of the mold is pressed against the prepreg, and the hollow mandrel The laminated prepreg is elastically deformed into an elliptical shape to form the laminated prepreg into a pipe shape having an arc shape in side view and an elliptical cross section, and the mold is heated to the curing temperature of the thermosetting resin to harden the laminated prepreg. Next, the mold is released, the molded laminated prepreg and the hollow mandrel are taken out from the mold, and the hollow mandrel is extracted from the molded aFJ prepreg.
また先端部に前ホークつめを有する炭素繊維強化樹脂製
自転車用前ホーク足を製造するときには。Also, when manufacturing a bicycle front fork leg made of carbon fiber reinforced resin that has a front fork pawl at the tip.
アタッチメントの端部を耐熱性及び耐熱性を有する可撓
材製中空マンドレルの一端開口部内に挿入し１次いで炭
素繊維に熱硬化性樹脂を含浸させて得られたプリプレグ
を上記中空マンドレル及び上記アタッチメントの周りに
積層状態に巻き付け。The end of the attachment is inserted into the opening at one end of a hollow mandrel made of a heat-resistant and heat-resistant flexible material, and then the prepreg obtained by impregnating carbon fiber with a thermosetting resin is inserted into the hollow mandrel and the attachment. Wrap around it in a laminated state.
次いで上記アタッチメントを抜き取って、前ホークつめ
の端部を上記中空マンドレルの一端開口部内に挿入し９
次いで同積層プリプレグと同前ホークつめと同中空マン
ドレルとを離接可能な金型内にセットし９次いで同金型
を閉じて、同金型の成形部面を上記プリプレグに押し付
け、上記中空マンドレルを楕円形に弾性変形させて、上
記積層プリプレグを側面視弧状の且つ断面楕円形のパイ
プ状に成形するとともに同積層プリプレグの先端端部を
上記前ホークつめの端部に接合して互いを一体化し且つ
同金型を熱硬化樹脂の硬化温度まで加熱して、上記積層
プリプレグを硬化させ９次いで上記金型を離型し、上記
成形後の積層プリプレグと上記前ホークつめと上記中空
マンドレルとを同金型から取り出して、同中空マンドレ
ルを成形後の積層プリプレグから抜き取る。Next, remove the attachment and insert the end of the front fork claw into the opening at one end of the hollow mandrel.
Next, the same laminated prepreg, the same front fork pawl, and the same hollow mandrel are set in a removable mold. 9 Next, the mold is closed, the molded surface of the mold is pressed against the prepreg, and the hollow mandrel is The laminated prepreg is elastically deformed into an elliptical shape to form the laminated prepreg into a pipe shape having an arc shape in side view and an elliptical cross section, and the tip end of the laminated prepreg is joined to the end of the front fork claw so as to be integral with each other. and heat the same mold to the curing temperature of the thermosetting resin to cure the laminated prepreg. 9 Then, the mold is released, and the molded laminated prepreg, the front fork pawl, and the hollow mandrel are combined. The mold is removed, and the hollow mandrel is extracted from the laminated prepreg after molding.
（実施例）
次に本発明の炭素繊維強化樹脂製自転車用前ホークの製
造方法を第１図乃至第１０図に示す一実施例により説明
すると、第１図の（１）が断面楕円形のテーパー管を側
面視弧状に湾曲させた状態の炭素繊維強化樹脂製自転車
用前ホーク足、（２）が同前ホーク足（１）の下端部に
固定される前ホークつめである。また第２図乃至第６図
及び第９．１０図の（３）が耐熱性及び耐熱性を有する
可撓材製（例えばシリコンゴム製）中空マンドレル、（
４）が炭素繊維に熱硬化性樹脂を含浸させて得られたプ
リプレグの複数枚を上記中空マンドレル（３）の周りに
積層状態に巻き付けた積層プリプレグで、これが上記前
ホーク足（１）になる。上記中空マンドレル（３）は、
積層プリプレグ（４）の成形時、第２図に示すように楕
円形に弾性変形する。このときの中空マンドレル（３）
の長軸方向長さをａとし。(Example) Next, the manufacturing method of the carbon fiber reinforced resin bicycle front fork of the present invention will be explained using an example shown in FIGS. 1 to 10. (1) in FIG. A front fork leg for a bicycle made of carbon fiber-reinforced resin has a tapered tube curved into an arc shape when viewed from the side, and (2) is a front fork pawl fixed to the lower end of the front fork leg (1). In addition, (3) in FIGS. 2 to 6 and 9.10 is a hollow mandrel made of a heat-resistant and heat-resistant flexible material (for example, made of silicone rubber), (
4) is a laminated prepreg obtained by impregnating carbon fiber with a thermosetting resin and wrapping a plurality of sheets of prepreg in a laminated state around the hollow mandrel (3), which becomes the front fork leg (1). . The hollow mandrel (3) is
When the laminated prepreg (4) is molded, it is elastically deformed into an elliptical shape as shown in FIG. Hollow mandrel at this time (3)
Let the length in the long axis direction be a.
短軸方向長さをｂとすると、中空マンドレル（３）によ
り求めることができる。また中空マンドレル（３）が楕
円形に弾性変形したときの断面積Ａは。If the short axis direction length is b, it can be determined using the hollow mandrel (3). Also, the cross-sectional area A when the hollow mandrel (3) is elastically deformed into an elliptical shape is:
により求めることができる。It can be found by
また第３図は、中空マンドレル（３）が楕円形に弾性変
形したときの具体的数値を示し１第４図は。Moreover, FIG. 3 shows specific numerical values when the hollow mandrel (3) is elastically deformed into an elliptical shape.
中空マンドレル（４）が楕円形に弾性変形する前の具体
的数値を示している。第２図に示すように前ホーク足（
１）の長軸方向長さ（ａ゛）を３５ｍｍ、短軸方向長さ
（ｂ′）を２４１．成形後の前ホーク足（１）の肉厚を
２１１１１１１．第３図に示すように中空マンドレル（
３）が楕円形に弾性変形したときの長軸方向長（ａ）を
３１ｍｍ、短軸方向長さ（ｂ）を２０ｍｍとすると、中
空マンドレル（３）が楕円形に弾性変形°したときの円
周方向長さＰは、上記０式よりになる。この円周の長さ
Ｐに相当する正円の直径は、第４図に示すように２６．
１ｍｍである。また中空マンドレル（３）が楕円形に弾
性変形したときの断面積Ａは、上記０式より
になる。このように中空マンドレル（３）が楕円形に弾
性変形したときの円周方向長さＰを８２ｍｍ。It shows specific numerical values before the hollow mandrel (4) is elastically deformed into an elliptical shape. As shown in Figure 2, the front hawk foot (
1) The length in the major axis direction (a゛) is 35 mm, and the length in the minor axis direction (b') is 241. The wall thickness of the front fork leg (1) after molding is 2111111. As shown in Figure 3, the hollow mandrel (
If the length in the major axis direction (a) when 3) is elastically deformed into an elliptical shape is 31 mm, and the length in the short axis direction (b) is 20 mm, the circle when the hollow mandrel (3) is elastically deformed into an elliptical shape is The circumferential length P is determined by the above formula 0. The diameter of a perfect circle corresponding to the length P of this circumference is 26.5 mm as shown in FIG.
It is 1 mm. Further, the cross-sectional area A when the hollow mandrel (3) is elastically deformed into an elliptical shape is given by the above formula 0. The length P in the circumferential direction when the hollow mandrel (3) is elastically deformed into an elliptical shape is 82 mm.
断面積Ａを４８７ｍｍ”にするためには、楕円形に弾性
変形する前の正円のマンドレル（３）の直径を２６．１
ｍｍ（断面積５３５１つから直径７．８ｍｍ（断面積４
Ｌｗｎ＋”）の中空部を取り除いて、５３５−４８＝４
８７ｎｕｗ”の断面積をもつ正円の中空マンドレル（３
）を製作すればよい。また第５図の（５）がシリコンゴ
ム製または金属製のアタッチメント、第７．８．９図の
（６）が下金型、 （６ａ）が同下金型（６）の成形部
、 （６ｂ）が同下金型（６）の一隅角部に形成した斜
面部（前ホークつめ（２）の取付は角度設定用斜面部）
、（７）が上金型、 （７ａ）が同上金型（７）の成形
部で、同上金型（７）の一隅角部にも上記斜面部（７ｂ
）に対応して同様の斜面部が形成されており、同各斜面
部が成形時に、前ホークつめ（２）を強固に保持するこ
とにより１位置、角度を決定すると同時に積層プリプレ
グ（４）への接合を行うようになっている。In order to make the cross-sectional area A 487 mm, the diameter of the perfect circular mandrel (3) before being elastically deformed into an elliptical shape is 26.1 mm.
mm (cross-sectional area 5351 to diameter 7.8 mm (cross-sectional area 4
Lwn+") by removing the hollow part, 535-48=4
A perfectly circular hollow mandrel with a cross-sectional area of 87nuw” (3
). In addition, (5) in Figure 5 is an attachment made of silicone rubber or metal, (6) in Figure 7.8.9 is the lower mold, (6a) is the molding part of the lower mold (6), ( 6b) is the sloped part formed at one corner of the lower mold (6) (the front fork pawl (2) is attached to the sloped part for angle setting)
, (7) is the upper mold, (7a) is the molding part of the same mold (7), and one corner of the same mold (7) also has the slope part (7b).
), and each slope part firmly holds the front fork pawl (2) during molding, determines the position and angle, and simultaneously attaches to the laminated prepreg (4). It is designed to perform the joining process.
次に本発明の炭素繊維強化樹脂製自転車用前ホークの製
造方法を具体的に説明する。第５図に示すようにシリコ
ンゴム製または金属製のアタッチメント（５）の端部に
設けた細径部を耐熱性及び耐熱性を有する可撓材製中空
マンドレル（３）の一端開口部内に挿入する。このとき
、中空マンドレル（３）の外周面とアタッチメント（５
）の外周面とが連続する。次いで炭素繊維に熱硬化性樹
脂を含浸させて得られたプリプレグ（４）を中空マンド
レル（３）及びアタッチメント（５）の周りに積層状態
に巻き付け２次いでアタッチメント（５）を抜き取って
、第６図に示すように前ホークつめ（２）の端部を積層
プリプレグ（４）及び中空マンドレル（５）の一端開口
部内に挿入する。なお前ホークつめ（２）の積層プリプ
レグ（４）に対する接合面には、必要に応じ接着剤また
はプライマーを予め塗布しておく。次いで第９図に示す
ように積層プリプレグ（４）と中空マンドレル（３）と
を下金型（６）及び上金型（７）の成形部（６ａ） （
７ａ）内にセットするとともに、前ホークつめ（２）を
下金型（６）及び上金型（７）の斜面部内にセットし１
次いで第１０図に示すように下金型（６）及び上金型（
７）を閉じて、下金型（６）及び上金型（７）の成形部
（６ａ） （７ａ）面を積層プリプレグ（４）に押し付
け、中空マンドレル（３）を楕円形に弾性変形させて、
積層プ、リブレグ（４）を側面視弧状の且つ断面楕円形
のパイプ状に成形するとともに、積層プリプレグ（４）
の端部を前ホークつめ（２）の端部に接合して互いを一
体化し且つ下金型（６）及び上金型（７）を熱硬化樹脂
の硬化温度まで加熱して、積層プリプレグ（４）を硬化
させ１次いで下金型（６）及び上金型（７）を離型し、
成形後の積層プリプレグ（前ホーク足）（４）と前ホー
クつめ（２）と中空マンドレル（３）とを下金型（６）
及び上金型（７）から取り出して、中空マンドレル（３
）を成形後の積層プリプレグ（４）から抜き取る。Next, a method for manufacturing a bicycle front fork made of carbon fiber reinforced resin according to the present invention will be explained in detail. As shown in Figure 5, insert the narrow diameter part provided at the end of the attachment (5) made of silicone rubber or metal into the opening at one end of the hollow mandrel (3) made of heat-resistant and flexible material. do. At this time, the outer peripheral surface of the hollow mandrel (3) and the attachment (5)
) is continuous with the outer peripheral surface. Next, a prepreg (4) obtained by impregnating carbon fiber with a thermosetting resin is wrapped around the hollow mandrel (3) and the attachment (5) in a laminated state, and the attachment (5) is then pulled out. Insert the end of the front fork pawl (2) into the opening at one end of the laminated prepreg (4) and hollow mandrel (5) as shown in FIG. If necessary, an adhesive or a primer is applied in advance to the joint surface of the fork claw (2) to the laminated prepreg (4). Next, as shown in FIG. 9, the laminated prepreg (4) and the hollow mandrel (3) are placed in the molding part (6a) of the lower mold (6) and the upper mold (7).
7a), and set the front fork pawl (2) inside the slope of the lower mold (6) and upper mold (7).
Next, as shown in Fig. 10, a lower mold (6) and an upper mold (
7) is closed, the molding parts (6a) and (7a) of the lower mold (6) and upper mold (7) are pressed against the laminated prepreg (4), and the hollow mandrel (3) is elastically deformed into an elliptical shape. hand,
The laminated prepreg (4) is formed into a pipe shape having an arc shape in side view and an oval cross section, and the laminated prepreg (4)
The end of the front fork pawl (2) is joined to the end of the front fork pawl (2) to integrate them, and the lower mold (6) and upper mold (7) are heated to the curing temperature of the thermosetting resin to form a laminated prepreg ( 4) is cured and then the lower mold (6) and upper mold (7) are released,
After molding, the laminated prepreg (front fork leg) (4), front fork pawl (2), and hollow mandrel (3) are placed in the lower mold (6).
And take it out from the upper mold (7) and insert it into a hollow mandrel (3
) is extracted from the laminated prepreg (4) after molding.
（発明の効果）
本発明は前記のように断面楕円形のテーパー管を側面視
弧状に湾曲させた状態の炭素繊維強化樹脂製自転車用前
ホーク足を製造するに当たり、炭素繊維に熱硬化性樹脂
を含浸させて得られたプリプレグを耐熱性及び離型性を
有する可撓材製中空マンドレルの周りに積層状態に巻き
付け１次いで同積層プリプレグと同中空マンドレルとを
離接可能な金型内にセットし２次いで同金型を閉じて。(Effects of the Invention) The present invention provides a carbon fiber-reinforced resin front fork leg for a bicycle in which a tapered tube with an elliptical cross-section is curved into an arc shape when viewed from the side as described above. The prepreg obtained by impregnating the prepreg is wrapped in a laminated state around a hollow mandrel made of a flexible material having heat resistance and mold releasability.Then, the laminated prepreg and the hollow mandrel are set in a mold that can be brought into and out of contact with the prepreg. 2. Then close the same mold.
同金型の成形部面を上記プリプレグに押し付け。Press the molded surface of the same mold onto the prepreg above.
上記中空マンドレルを楕円形に弾性変形させて。By elastically deforming the hollow mandrel into an oval shape.
上記積層プリプレグを側面視弧状の且つ断面楕円形のパ
イプ状に成形し且つ同金型を熱硬化樹脂の硬化温度まで
加熱して、上記積層プリプレグを硬化させ２次いで上記
金型を離型し、上記成形後の積層プリプレグと上記可撓
材製中空マンドレ元とを同金型から取り出して、同可撓
材製中空マンドレルを成形後の積層プリプレグから抜き
取るので。Molding the laminated prepreg into a pipe shape having an arc shape in side view and an elliptical cross section, and heating the same mold to the curing temperature of the thermosetting resin to cure the laminated prepreg, and then releasing the mold, The laminated prepreg after molding and the hollow mandrel made of flexible material are taken out of the same mold, and the hollow mandrel made of flexible material is extracted from the laminated prepreg after molding.
形状の複雑な炭素繊維強化樹脂製自転車用前ホーク、即
ち、断面楕円形のテーパー管を側面視弧状に湾曲させた
状態の自転車用前ホークを圧力空気供給装置等を必要と
せずに製造できて、設備費を低減できる効果がある。A bicycle front fork made of carbon fiber reinforced resin with a complicated shape, that is, a bicycle front fork made of a tapered tube with an oval cross section curved in an arc shape when viewed from the side, can be manufactured without the need for a pressurized air supply device. This has the effect of reducing equipment costs.
また本発明は前記のように断面楕円形のテーパー管を側
面視弧状に湾曲させた状態の炭素繊維強化樹脂製自転車
用前ホーク足の先端に前ホークつめを有する前ホーク足
を製造するに当たり、アタッチメントの端部を耐熱性及
び離型性を有する可撓材製中空マンドレルの一端開口部
内に挿入し。Further, the present invention provides a front fork leg for a bicycle made of carbon fiber reinforced resin in which a tapered tube having an oval cross-section is curved in an arc shape when viewed from the side as described above, and has a front fork pawl at the tip thereof. Insert the end of the attachment into the opening at one end of a hollow mandrel made of a flexible material having heat resistance and mold release properties.
次いで炭素繊維に熱硬化性樹脂を含浸させて得られたプ
リプレグを上記中空マンドレル及び上記アタッチメント
の周りに積層状態に巻き付け１次いで上記アタッチメン
トを抜き取っソ、前ホークつめの端部を上記中空マンド
レルの一端開口部内に挿入し２次いで同積層プリプレグ
と同前ホークつめと同中空マンドレルとを離接可能な金
型内にセットし９次いで同金型を閉じて、同金型の成形
部面を上記プリプレグに押し付け、上記可撓材製中空マ
ンドレルを楕円形に弾性変形させて、上記積層プリプレ
グを側面視弧状の且つ断面楕円形のパイプ状に成形する
とともに同積層プリプレグの先端部を上記前ホークつめ
の端部に接合して互いを一体化し且つ同金型を熱硬化樹
脂の硬化温度まで加熱して、上記積層プリプレグを硬化
させ１次いで上記金型を離型し、上記成形後の積層プリ
プレグと上記前ホークつめと上記中空マンドレルとを同
金型から取り出して、同中空マンドレルを成形後の積層
プリプレグから抜き取るので、前記効果の外に、前ホー
ク足の成形時、前ホークつめを前ホーク足の先端部に同
時に取付けることができる効果がある。Next, a prepreg obtained by impregnating carbon fiber with a thermosetting resin is wrapped around the hollow mandrel and the attachment in a laminated state. 1. Next, the attachment is pulled out and the end of the front hawk claw is attached to one end of the hollow mandrel. 9. Insert the laminated prepreg into the opening, set the same laminated prepreg, the front fork pawl, and the hollow mandrel in a mold that can be separated from the mold. The hollow mandrel made of flexible material is elastically deformed into an elliptical shape to form the laminated prepreg into a pipe shape having an arc shape in side view and an elliptical cross section, and the tip of the laminated prepreg is attached to the front fork pawl. The end portions are joined to integrate each other, and the same mold is heated to the curing temperature of the thermosetting resin to cure the laminated prepreg, and then the mold is released, and the laminated prepreg after the molding and the above Since the front fork pawl and the hollow mandrel are taken out of the same mold and the hollow mandrel is extracted from the laminated prepreg after molding, in addition to the above effect, when the front fork foot is molded, the front fork pawl is It has the effect of being able to be attached to the tip at the same time.
第１図は自転車用前ホークを示す側面図、第２゜３図は
弾性変形時の可撓材製中空マンドレルの長軸方向及び短
軸方向の長さを示す説明図、第４図は弾性変形前の可撓
材製中空マンドレルの直径及び中空部の直径を示す説明
図、第５図はプリプレグを中空マンドレル及びアタッチ
メントの周りに巻き付けたときの説明図、第６図は前ホ
ークつめを挿入したときの説明図、第７図（１）は下金
型の平面図、第７図（ｎ）は下金型の一側面図、第７図
（ｍ）は下金型の他側面図□、第８図は下金型及び上金
型の側面図、第９図は中空マンドレル及び積層プリプレ
グを下金型及び上金型内にセットしたときの説明図、第
１０図は下金型及び上金型を閉じたときの説明図である
。
（１）・・・自転車用前ホーク足、（２）・・・前ホー
クつめ、（３）・・・可撓材製中空マンドレル、（４）
・・・積層プリプレグ、（５）・・・アタッチメント（
６） （７）・・・金型。Figure 1 is a side view showing the front fork for bicycles, Figures 2 and 3 are explanatory diagrams showing the lengths of the flexible hollow mandrel in the long and short axis directions during elastic deformation, and Figure 4 shows the elastic deformation. An explanatory diagram showing the diameter of the hollow mandrel made of flexible material and the diameter of the hollow part before deformation, Figure 5 is an explanatory diagram when the prepreg is wrapped around the hollow mandrel and the attachment, and Figure 6 is an explanatory diagram showing the front hawk pawl inserted. Figure 7 (1) is a plan view of the lower mold, Figure 7 (n) is a side view of the lower mold, and Figure 7 (m) is the other side view of the lower mold. , Fig. 8 is a side view of the lower mold and upper mold, Fig. 9 is an explanatory diagram when the hollow mandrel and laminated prepreg are set in the lower mold and upper mold, and Fig. 10 is a side view of the lower mold and the upper mold. It is an explanatory view when the upper mold is closed. (1) Front fork leg for bicycle, (2) Front fork pawl, (3) Hollow mandrel made of flexible material, (4)
... Laminated prepreg, (5) ... Attachment (
6) (7)...Mold.
Claims (2)
た状態の炭素繊維強化樹脂製自転車用前ホーク足を製造
するに当たり、炭素繊維に熱硬化性樹脂を含浸させて得
られたプリプレグを耐熱性及び離型性を有する可撓材製
中空マンドレルの周りに積層状態に巻き付け、次いで同
積層プリプレグと同中空マンドレルとを離接可能な金型
内にセットし、次いで同金型を閉じて、同金型の成形部
面を上記プリプレグに押し付け、上記中空マンドレルを
楕円形に弾性変形させて、上記積層プリプレグを側面視
弧状の且つ断面楕円形のパイプ状に成形し且つ同金型を
熱硬化樹脂の硬化温度まで加熱して、上記積層プリプレ
グを硬化させ、次いで上記金型を離型し、上記成形後の
積層プリプレグと上記可撓材製中空マンドレルとを同金
型から取り出して、同可撓材製中空マンドレルを成形後
の積層プリプレグから抜き取ることを特徴とした炭素繊
維強化樹脂製自転車用前ホークの製造方法。(1) In manufacturing a bicycle front fork leg made of carbon fiber-reinforced resin, which is a tapered tube with an elliptical cross section curved into an arc shape when viewed from the side, a prepreg obtained by impregnating carbon fiber with a thermosetting resin is used. It is wrapped in a laminated state around a hollow mandrel made of a flexible material having heat resistance and mold releasability, and then the laminated prepreg and the hollow mandrel are set in a mold that can be separated and separated, and then the mold is closed. , the molding surface of the same mold is pressed against the prepreg, the hollow mandrel is elastically deformed into an elliptical shape, the laminated prepreg is molded into a pipe shape having an arc shape in side view and an elliptical cross section, and the mold is heated. The laminated prepreg is cured by heating to the curing temperature of the cured resin, and then the mold is released, and the molded laminated prepreg and the hollow mandrel made of flexible material are taken out of the mold. A method for producing a front fork for a bicycle made of carbon fiber reinforced resin, characterized by extracting a hollow mandrel made of a flexible material from a laminated prepreg after molding.
た状態の炭素繊維強化樹脂製自転車用前ホーク足の先端
に前ホークつめを有する前ホーク足を製造するに当たり
、アタッチメントの端部を耐熱性及び離型性を有する可
撓材製中空マンドレルの一端開口部内に挿入し、次いで
炭素繊維に熱硬化性樹脂を含浸させて得られたプリプレ
グを上記中空マンドレル及び上記アタッチメントの周り
に積層状態に巻き付け、次いで上記アタッチメントを抜
き取って、前ホークつめの端部を上記中空マンドレルの
一端開口部内に挿入し、次いで同積層プリプレグと同前
ホークつめと同中空マンドレルとを離接可能な金型内に
セットし、次いで同金型を閉じて、同金型の成形部面を
上記プリプレグに押し付け、上記可撓材製中空マンドレ
ルを楕円形に弾性変形させて、上記積層プリプレグを側
面視弧状の且つ断面楕円形のパイプ状に成形するととも
に同積層プリプレグの先端部を上記前ホークつめの端部
に接合して互いを一体化し且つ同金型を熱硬化樹脂の硬
化温度まで加熱して、上記積層プリプレグを硬化させ、
次いで上記金型を離型し、上記成形後の積層プリプレグ
と上記前ホークつめと上記中空マンドレルとを同金型か
ら取り出して、同中空マンドレルを成形後の積層プリプ
レグから抜き取ることを特徴とした炭素繊維強化樹脂製
自転車用前ホークの製造方法。(2) When manufacturing a front fork leg for a bicycle made of carbon fiber reinforced resin, which has a tapered tube with an elliptical cross section curved into an arc shape when viewed from the side, the end of the attachment has a front fork pawl at the tip. A hollow mandrel made of a flexible material having heat resistance and mold releasability is inserted into an opening at one end, and then a prepreg obtained by impregnating carbon fiber with a thermosetting resin is laminated around the hollow mandrel and the attachment. Next, the attachment is pulled out, and the end of the front fork claw is inserted into one end opening of the hollow mandrel, and then the laminated prepreg, the front fork claw, and the hollow mandrel are placed in a mold that can be brought into and out of contact with the hollow mandrel. Then, the mold is closed, the molding surface of the mold is pressed against the prepreg, and the hollow mandrel made of flexible material is elastically deformed into an oval shape, so that the laminated prepreg has an arc shape and an arc shape when viewed from the side. The laminated prepreg is formed into a pipe shape with an oval cross section, and the tip of the laminated prepreg is joined to the end of the front fork pawl to integrate them, and the mold is heated to the curing temperature of the thermosetting resin to form the laminated prepreg. Harden the prepreg,
Next, the mold is released, the molded laminated prepreg, the front fork pawl, and the hollow mandrel are taken out from the mold, and the hollow mandrel is extracted from the molded laminated prepreg. A method for manufacturing a bicycle front fork made of fiber-reinforced resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62304557A JPH0671914B2 (en) | 1987-12-03 | 1987-12-03 | Method for manufacturing front fork made of carbon fiber reinforced resin for bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62304557A JPH0671914B2 (en) | 1987-12-03 | 1987-12-03 | Method for manufacturing front fork made of carbon fiber reinforced resin for bicycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01148682A true JPH01148682A (en) | 1989-06-12 |
| JPH0671914B2 JPH0671914B2 (en) | 1994-09-14 |
Family
ID=17934427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62304557A Expired - Lifetime JPH0671914B2 (en) | 1987-12-03 | 1987-12-03 | Method for manufacturing front fork made of carbon fiber reinforced resin for bicycle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0671914B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7464950B2 (en) * | 2003-06-30 | 2008-12-16 | Trek Bicycle Corporation | Continuous fiber carbon fork |
| US7543835B2 (en) | 2006-05-03 | 2009-06-09 | Trek Bicycle Corporation | Bicycle fork with improved steer tube and crown |
| CN101973130A (en) * | 2010-08-27 | 2011-02-16 | 上海晋飞复合材料科技有限公司 | Emulsion liner auxiliary pre-impregnating mould pressing prepared integrated front fork mould and method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56115216A (en) * | 1980-01-24 | 1981-09-10 | Hitachi Chem Co Ltd | Prepreg material and manufacture thereof |
| EP0230839A1 (en) * | 1985-10-29 | 1987-08-05 | Technique Du Verre Tisse S.A. | Bicycle fork or similar article based on resin reinforced by a textile structure, and process for its manufacture |
-
1987
- 1987-12-03 JP JP62304557A patent/JPH0671914B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56115216A (en) * | 1980-01-24 | 1981-09-10 | Hitachi Chem Co Ltd | Prepreg material and manufacture thereof |
| EP0230839A1 (en) * | 1985-10-29 | 1987-08-05 | Technique Du Verre Tisse S.A. | Bicycle fork or similar article based on resin reinforced by a textile structure, and process for its manufacture |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7464950B2 (en) * | 2003-06-30 | 2008-12-16 | Trek Bicycle Corporation | Continuous fiber carbon fork |
| US7543835B2 (en) | 2006-05-03 | 2009-06-09 | Trek Bicycle Corporation | Bicycle fork with improved steer tube and crown |
| CN101973130A (en) * | 2010-08-27 | 2011-02-16 | 上海晋飞复合材料科技有限公司 | Emulsion liner auxiliary pre-impregnating mould pressing prepared integrated front fork mould and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0671914B2 (en) | 1994-09-14 |
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