JPS5838257B2 - Bulge processing method for curved material pipes - Google Patents
Bulge processing method for curved material pipesInfo
- Publication number
- JPS5838257B2 JPS5838257B2 JP55037335A JP3733580A JPS5838257B2 JP S5838257 B2 JPS5838257 B2 JP S5838257B2 JP 55037335 A JP55037335 A JP 55037335A JP 3733580 A JP3733580 A JP 3733580A JP S5838257 B2 JPS5838257 B2 JP S5838257B2
- Authority
- JP
- Japan
- Prior art keywords
- curved
- punch
- material tube
- curved material
- pipe
- 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
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は自転車またはオートバイ等のフレームに用いる
金属製の湾曲素材管の膨出加工法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for bulging a curved metal tube used for frames of bicycles, motorcycles, etc.
従来パイプを膨出加工するにはパイプ内に液圧を加える
と共にパイプの両端をパンチで押圧して膨出部を成形し
ている。Conventionally, in order to bulge a pipe, a bulge is formed by applying hydraulic pressure inside the pipe and pressing both ends of the pipe with a punch.
しかしながらこの従来の方法で湾曲パイプの途中に膨出
部を成形しようとすると、パイプを両端より挾圧する押
圧力が災いして、くの字の物体を上下から押した時、そ
の折れ曲りが簡単に増大する様に、湾曲パイプの曲げ内
側面に折れ込み皺が生ずるため実用的な戒形が出来なか
った。However, if you try to form a bulge in the middle of a curved pipe using this conventional method, the pressure force that squeezes the pipe from both ends will cause the pipe to bend easily when pressed from above and below. Increasingly, folds and creases occur on the inner surface of the curved pipe, making it impossible to form a practical shape.
本発明は上述の欠点を除去するためなされたもので、湾
曲パイプに湾曲心金を挿入しながら押圧することにより
パイプの湾曲部に皺が生じないようにすることを目的と
するものである。The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to prevent wrinkles from forming in the curved portion of the pipe by pressing the curved mandrel while inserting it into the curved pipe.
以下図面に基づいて本発明の実施例を説明する。Embodiments of the present invention will be described below based on the drawings.
図中１は膨出部を有する湾曲素材管或形用の割り金型で
、２はその半円状凹陥溝の直線部、３は湾曲部、４は湾
曲部に設けた膨出空所、５は湾曲部４の曲率中心におい
て金型１に設けた軸で、６はこの軸５に一端を枢支した
パンチアームである。In the figure, 1 is a split mold for a curved material pipe having a bulging part, 2 is a straight part of the semicircular concave groove, 3 is a curved part, 4 is a bulge cavity provided in the curved part, 5 is a shaft provided in the mold 1 at the center of curvature of the curved portion 4, and 6 is a punch arm having one end pivotally supported on this shaft 5.
このパンチアーム６には前記湾曲部４と同一曲率で、か
つ湾曲素材管内に嵌入し得る湾曲パンチ心金７を突設し
、この心金７の基部に湾曲素材管の湾曲端部に衝合し得
る衝合段部８を設げる。A curved punch mandrel 7 which has the same curvature as the curved part 4 and can be fitted into the curved material pipe is protruded from the punch arm 6, and the base of the mandrel 7 abuts against the curved end of the curved material pipe. A possible abutment step 8 is provided.
本発明においては、組み合わせた割り金型１の直線部２
内に第２図に示すように、直線状の湾曲素材管９を挿入
し、続いて油圧シリンダ１０と一体に形成したバンチシ
ャント１１を素材管９の外側より挿入して、油圧シリン
ダ１０の端面１０ａが金型１の端而１ａに第３図に示す
ように衝合するまで、油圧シリンダ１０を矢印Ａの方向
に移動させることにより素材管９の先端部を湾曲部３内
に押し進める。In the present invention, the linear portion 2 of the combined split mold 1 is
As shown in FIG. 2, a linear curved material pipe 9 is inserted into the interior, and then a bunch shunt 11 formed integrally with the hydraulic cylinder 10 is inserted from the outside of the material pipe 9, and the end face of the hydraulic cylinder 10 is inserted. By moving the hydraulic cylinder 10 in the direction of arrow A, the tip of the material tube 9 is pushed into the curved portion 3 until the end 10a abuts against the edge 1a of the mold 1 as shown in FIG.
つぎに第４図．に示すようにパンチアーム６を矢印Ｂの
方向に押圧することにより、湾曲パンチ心金７を素材管
９の湾曲部内に挿入すると共に、衝合段部８を素材管９
の端面に強圧して密封する。Next, Figure 4. By pressing the punch arm 6 in the direction of arrow B as shown in FIG.
Apply strong pressure to the end face to seal.
ついで第５図に示すように、パンチアーム６をさらに矢
印Ｂのように押圧すると共に、油圧シリンダ１０内のピ
ストン１２を矢印Ｃの方向に押し込んで、油圧シリンダ
１０内の高圧液をパンチシャフト１１に設けた貫通孔１
３を介して素材管９内に圧入することにより、素材管９
の湾曲部に膨出部９ａを膨出させる。Next, as shown in FIG. 5, the punch arm 6 is further pushed in the direction of arrow B, and the piston 12 in the hydraulic cylinder 10 is pushed in the direction of arrow C, so that the high pressure liquid in the hydraulic cylinder 10 is transferred to the punch shaft 11. Through hole 1 provided in
By press-fitting into the material tube 9 through 3, the material tube 9
The bulging portion 9a is bulged out at the curved portion.
この影出加工が終了すれば、第６図に示すように油圧シ
リンダ１０を矢印Ｄのように後退させると共に、ピスト
ン１２を矢印Ｅのように後退させ、さらにパンチアーム
６を矢印Ｆの方向に戻して後、割り金型１を開いて湾曲
素材管９を取り出す。When this shading process is completed, as shown in FIG. 6, the hydraulic cylinder 10 is moved back in the direction of arrow D, the piston 12 is moved back in the direction of arrow E, and the punch arm 6 is moved in the direction of arrow F. After returning, the split mold 1 is opened and the curved material tube 9 is taken out.
第７図は成形完了後の湾曲素材管９を示すものである。FIG. 7 shows the curved material tube 9 after completion of molding.
なお前記貫通孔１３は湾曲パンチ心金７の方に設けても
よい。Note that the through hole 13 may be provided in the curved punch mandrel 7.
次に本発明における湾曲パンチ心金７を湾曲素材管９内
に挿入し、管の縦方向へ圧縮力を加えなから膨出加工を
行う際の作用を説明する。Next, the operation of inserting the curved punch mandrel 7 in the present invention into the curved material tube 9 and performing the bulging process without applying a compressive force in the longitudinal direction of the tube will be explained.
湾曲加工された湾曲素材管９の膨出空所４付近において
、この湾曲素材管９には管の縦方向の圧縮力が加わると
同時に内部には高液圧が作用するため、湾曲素材管９の
湾曲部が、湾曲パンチ心金１と金型１の膨出空所４に役
って膨出方向に流動して膨出部９ａを形成する。Near the bulge space 4 of the curved material tube 9 that has been curved, compressive force in the longitudinal direction of the tube is applied to the curved material tube 9, and at the same time, high hydraulic pressure acts inside the curved material tube 9. The curved portion flows in the bulging direction with the help of the curved punch mandrel 1 and the bulging cavity 4 of the mold 1, thereby forming the bulging portion 9a.
そしてこの場合心金７によって湾曲素材管９の湾曲部内
側の折れ込みを防ぐことができる。In this case, the mandrel 7 can prevent the curved material tube 9 from bending inside the curved portion.
このように本発明の膨出加工方法によれば、湾曲素材管
９内に湾曲パンチ心金７を挿入しながら押圧するので、
湾曲素材管９に皺を生じることがなく、且つ湾曲素材管
９の組織が湾曲パンチ心金７に沿って流動するから膨出
部９ａの肉厚が均等にできるという効果が得られる。According to the bulge processing method of the present invention, the curved punch mandrel 7 is inserted into the curved material tube 9 while being pressed.
Since wrinkles do not occur in the curved material tube 9 and the structure of the curved material tube 9 flows along the curved punch mandrel 7, the effect that the wall thickness of the bulged portion 9a can be made uniform can be obtained.
第１図〜第６図は本発明の加工方法を段階的に示す説明
図、第７図は本発明加工法により膨出加工を行った湾曲
素材管の側面図である。
１・・・割り金型、２・・・直線部、３・・・湾曲部、
４・・・膨出空所、５・・・軸、６・・・パンチアーム
、７・・・湾曲パンチ心金、８・・・衝合段部、９・・
・湾曲素材管、９ａ・・・膨出部、１０・・・油圧シリ
ンダ、１１・・・パンチシャフト、１２・・・ピストン
、１３・・・貫通孔。FIGS. 1 to 6 are explanatory diagrams showing the processing method of the present invention step by step, and FIG. 7 is a side view of a curved material tube that has been bulged by the processing method of the present invention. 1... Split mold, 2... Straight part, 3... Curved part,
4...Bulging cavity, 5...Axis, 6...Punch arm, 7...Curved punch core, 8...Abutment step, 9...
- Curved material pipe, 9a... Swelling part, 10... Hydraulic cylinder, 11... Punch shaft, 12... Piston, 13... Through hole.
Claims (1)
にセットした湾曲素材管の湾曲端部に衝合段部を有する
湾曲パンチ心金を挿入し、湾曲素材管の他端にパンチシ
ャフトを押し当て、湾曲パンチ心金を湾曲素材管に対し
押圧すると共に、パンチに設けた貫通孔を介して、湾曲
素材管内部に高液圧を与えることにより金型の湾曲部に
設けた膨出空所において素材管を膨出させるようにした
湾曲素材管の膨出加工法。1. To bulge the curved portion of the curved material tube, insert a curved punch mandrel having an abutment step into the curved end of the curved material tube set in the mold, and insert a punch shaft into the other end of the curved material tube. The curved punch mandrel is pressed against the curved material tube, and high liquid pressure is applied to the inside of the curved material tube through the through hole provided in the punch, thereby creating a bulge in the curved part of the mold. A method for bulging a curved material pipe in which the material pipe is bulged in a hollow space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55037335A JPS5838257B2 (en) | 1980-03-24 | 1980-03-24 | Bulge processing method for curved material pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55037335A JPS5838257B2 (en) | 1980-03-24 | 1980-03-24 | Bulge processing method for curved material pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56134024A JPS56134024A (en) | 1981-10-20 |
| JPS5838257B2 true JPS5838257B2 (en) | 1983-08-22 |
Family
ID=12494744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55037335A Expired JPS5838257B2 (en) | 1980-03-24 | 1980-03-24 | Bulge processing method for curved material pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838257B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0430729A (en) * | 1990-05-29 | 1992-02-03 | Takaki Yokoyama | Dripping type distributor device |
-
1980
- 1980-03-24 JP JP55037335A patent/JPS5838257B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0430729A (en) * | 1990-05-29 | 1992-02-03 | Takaki Yokoyama | Dripping type distributor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56134024A (en) | 1981-10-20 |
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