JPS5952006B2 - How to mold a bicycle head drag - Google Patents
How to mold a bicycle head dragInfo
- Publication number
- JPS5952006B2 JPS5952006B2 JP55067081A JP6708180A JPS5952006B2 JP S5952006 B2 JPS5952006 B2 JP S5952006B2 JP 55067081 A JP55067081 A JP 55067081A JP 6708180 A JP6708180 A JP 6708180A JP S5952006 B2 JPS5952006 B2 JP S5952006B2
- Authority
- JP
- Japan
- Prior art keywords
- material tube
- punch
- large diameter
- stepped portion
- mold
- 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
Links
- 239000000463 material Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000037237 body shape Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Steering Devices For Bicycles And Motorcycles (AREA)
- Motorcycle And Bicycle Frame (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は自転車用へツドラツグの成形方法に関するもの
で、一体型へツドラツグにおいて、素材管の膨出加工と
模様段付加工とを同時に行なう成形方法である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a bicycle head drag, and is a molding method in which a material tube is bulged and patterned at the same time in an integrated head drag.
一般に自転車のヘッドラックは、上ラック及び下ラック
とヘッドパイプとを互いに接合して構成するか、あるい
は、第１図に示すようにバルジ成形によりー体型へツド
ラツグとした後、これに模様を施す場合は彫刻をするか
、あるいは、第２回目のバルジ成形を行なつて模様を浮
き出させていた。In general, a bicycle head rack is constructed by joining an upper rack, a lower rack, and a head pipe to each other, or, as shown in Fig. 1, is formed by bulge molding to form a drag to the body shape, and then a pattern is applied to this. When this was done, it was either engraved or a second bulge was formed to make the pattern stand out.
しかし、この方法は部品点数や複雑な接合作業、及び複
数に亘るバルジ成形用の金型設備と、複数の成形工程が
か・るため、設備及び工程が多すぎるという欠点があつ
た。本発明は第３図〜第７図に示すように、一対の分割
金型１に坑道２、２’と膨出空隙部３及び模様段付部４
を刻設し、この金型１内に第４図に示すように、模様段
付部４間の坑道２’の直径に外管が合つた素材管５を挿
入し、該素材管５の内孔よりやや小径のパンチガイド６
と素材管５の内外径を拡大するパンチ段付部７と、この
パンチ段付部７と連らなる大径部７ａと、この大径部７
ａと連らなる段部Ｂａを有するパンチシャフト８を、前
記素材管５の両側の坑道２から圧入して第５図に示すよ
うに素材管５を両側から段部Ｂａを介して押圧すること
により、パンチ段付部７と大径部７ａにより素材管５の
両端部の内外径を拡大すると共に、素材管５を圧縮し、
ついで第６図および第７図に示すようにパンチシャフト
８のいずれか一方に設けた貫通孔９を介して、この貫通
抗９と連通した油圧シリンダー（図示せず）により、素
、材管５の内部の液圧を高めることにより、第６図の矢
印Ａで示すようにパンチガイド６を介して液圧を膨出空
隙部３内の素材管５内に送り込んで、その部分の素材管
５を膨出させながら素材管５をさらに圧縮して、最終的
には第７図に示すようにフ素材管５に膨出部１０を成形
すると共に、パンチ段付部７と金型１の模様段付部４と
の挟圧作用により素材管５の外面に模様段付部１１を浮
き出させてへツドラツグを一工程で成形する。However, this method has the disadvantage that it requires too many equipment and processes because it requires a large number of parts, complicated joining work, multiple mold equipment for bulge forming, and multiple molding processes. As shown in FIGS. 3 to 7, the present invention includes a pair of split molds 1, a tunnel 2, 2', a bulging cavity 3, and a pattern stepped part 4.
As shown in FIG. Punch guide 6 with a slightly smaller diameter than the hole
, a punch stepped portion 7 that expands the inner and outer diameters of the material tube 5, a large diameter portion 7a continuous with the punch stepped portion 7, and a large diameter portion 7.
A punch shaft 8 having a stepped portion Ba continuous with a is press-fitted from the tunnel 2 on both sides of the material tube 5 to press the material tube 5 from both sides through the stepped portion Ba as shown in FIG. As a result, the inner and outer diameters of both ends of the material tube 5 are expanded by the punch stepped portion 7 and the large diameter portion 7a, and the material tube 5 is compressed.
Next, as shown in FIGS. 6 and 7, a hydraulic cylinder (not shown) communicating with the through hole 9 provided in either one of the punch shafts 8 is used to press the raw material and the material tube 5. By increasing the liquid pressure inside the material tube 5, the liquid pressure is sent into the material tube 5 in the bulging cavity 3 through the punch guide 6 as shown by arrow A in FIG. The material tube 5 is further compressed while bulging, and finally, as shown in FIG. The pattern stepped part 11 is embossed on the outer surface of the material tube 5 by the pinching action with the stepped part 4, and the head drag is formed in one step.
なお第６図および第７図に示す工程中において、素材管
５；内に作用する液圧は、大径部７ａおよび段部Ｂａと
素材管５との圧接面によつてシールされると共に、金型
１の坑道２とパンチシャフト８との密嵌合によつてシー
ルされる。第２図は本発明の方法で成形した後、膨出部
１０の先端を穿孔した一体型へツドラツダの完成品であ
る。In addition, during the steps shown in FIGS. 6 and 7, the hydraulic pressure acting inside the material tube 5 is sealed by the pressure contact surface of the material tube 5 with the large diameter portion 7a and the stepped portion Ba. A tight fit between the tunnel 2 of the mold 1 and the punch shaft 8 provides a seal. FIG. 2 shows a completed product of an integrated type lattice with a hole formed at the tip of the bulge 10 after molding according to the method of the present invention.
以上のように本発明によれば、一種類の金型設備と、一
回のバルジ成形工程で一体型ヘッドラックの膨出加工と
模様段付加工が同時に、しかも簡単容易にできるので、
本発明方法は従来の成形方法に比べて製造効率を高め、
製造コストを下げることができる効果がある。As described above, according to the present invention, the bulge processing and pattern step processing of the integrated head rack can be performed simultaneously and easily with one type of mold equipment and one bulge forming process.
The method of the present invention increases manufacturing efficiency compared to conventional molding methods,
This has the effect of lowering manufacturing costs.
更に、本発明方法は冷間加工で軸方向に圧縮力を加えな
がら膨出部と段付模様を形成するので、部分によつては
肉厚が増大するから強固なヘッドラックを提供できると
いう効果も得られる。Furthermore, since the method of the present invention forms the bulges and stepped patterns while applying compressive force in the axial direction during cold working, the wall thickness increases in some areas, making it possible to provide a strong head rack. You can also get
第１図は従来の一体型ヘッドラックの斜視図、第２図は
本発明の方法で成形した一体型ヘッドラックの斜視図、
第３図は本発明に使用する金型の断面図、第４図はその
傘型に素材管を挿入して両側にパンチシヤフトを待機さ
せた状態を示す断面図、第５図はそのパンチシヤフトの
圧入途中を示す断面図、第６図は成形過程を示す断面図
、第７図は成形が終了した状態を示す断面図である。
１ ・・・・・・金型、２，２’・・・・・・坑道、３
・・・・・・膨出空隙部、４・・・・・・模様段付部、
５・・・・・・素材管、６・・・・・・パンチガイド、
７・・・・・・パンチ段付部、７ａ・・・・・・大径部
、８・・・・・・パンチシヤフト ８ａ・・・・・・段
部、９・・・・・・貫通孔、１０・・・・・・膨出部、
１１・・・模様段付部。FIG. 1 is a perspective view of a conventional integrated head rack, FIG. 2 is a perspective view of an integrated head rack molded by the method of the present invention,
Fig. 3 is a sectional view of the mold used in the present invention, Fig. 4 is a sectional view showing a state in which a material tube is inserted into the umbrella shape and punch shafts are placed on standby on both sides, and Fig. 5 is the punch shaft. FIG. 6 is a cross-sectional view showing the molding process, and FIG. 7 is a cross-sectional view showing the state after molding. 1... Mold, 2,2'... Mine shaft, 3
...Bulging void portion, 4...Pattern stepped portion,
5...Material tube, 6...Punch guide,
7... Punch stepped part, 7a... Large diameter part, 8... Punch shaft 8a... Stepped part, 9... Penetration hole, 10... bulge,
11... Pattern stepped part.
Claims (1)
設した一対の分割金型１内に素材管５を挿入し、該素材
管５の内孔に挿入するパンチガイド６と、素材管５の内
外径を拡大するパンチ段付部７と、このパンチ段付部７
と連らなる大径部７ａと、この大径部７ａと連らなる段
部８ａを有するパンチシャフト８を、前記素材管５の両
側の坑道２から圧入すると共に、油圧シリンダーに連通
したパンチシャフト８内の貫通孔９より素材管５の内部
の液圧を高めて、膨出空隙部３内に素材管５の膨張部１
０を成形すると共に、模様段付部１１を一工程で成形す
ることを特徴とする自転車用ヘツドラツグの成形方法。1. A material tube 5 is inserted into a pair of split molds 1 in which the tunnels 2, 2', a bulging cavity 3, and a pattern stepped portion 4 are carved, and a punch guide 6 is inserted into the inner hole of the material tube 5. , a punch stepped portion 7 that expands the inner and outer diameters of the material tube 5, and this punch stepped portion 7.
A punch shaft 8 having a large diameter portion 7a continuous with the large diameter portion 7a and a stepped portion 8a continuous with the large diameter portion 7a is press-fitted from the tunnel 2 on both sides of the material pipe 5, and the punch shaft communicates with the hydraulic cylinder. The liquid pressure inside the material tube 5 is increased through the through hole 9 in the material tube 8, and the expanded portion 1 of the material tube 5 is inserted into the bulging cavity 3.
1. A method for molding a head drag for a bicycle, which comprises molding a pattern stepped part 11 in one step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55067081A JPS5952006B2 (en) | 1980-05-22 | 1980-05-22 | How to mold a bicycle head drag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55067081A JPS5952006B2 (en) | 1980-05-22 | 1980-05-22 | How to mold a bicycle head drag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56163987A JPS56163987A (en) | 1981-12-16 |
| JPS5952006B2 true JPS5952006B2 (en) | 1984-12-17 |
Family
ID=13334561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55067081A Expired JPS5952006B2 (en) | 1980-05-22 | 1980-05-22 | How to mold a bicycle head drag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952006B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS623833A (en) * | 1985-06-28 | 1987-01-09 | Isao Kimura | Manufacture of integrated head lug with dish part |
| JP4939706B2 (en) * | 2001-09-04 | 2012-05-30 | 三恵技研工業株式会社 | Hydroforming method for metal pipe |
-
1980
- 1980-05-22 JP JP55067081A patent/JPS5952006B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56163987A (en) | 1981-12-16 |
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