JP3363975B2 - Method and apparatus for forming curved tube with flat cross section - Google Patents
Method and apparatus for forming curved tube with flat cross sectionInfo
- Publication number
- JP3363975B2 JP3363975B2 JP32779193A JP32779193A JP3363975B2 JP 3363975 B2 JP3363975 B2 JP 3363975B2 JP 32779193 A JP32779193 A JP 32779193A JP 32779193 A JP32779193 A JP 32779193A JP 3363975 B2 JP3363975 B2 JP 3363975B2
- Authority
- JP
- Japan
- Prior art keywords
- curvature
- flexible mandrel
- tube
- curved
- section
- 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 - Fee Related
Links
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は湾曲管の湾曲部の内側す
なわち凹入側によって囲まれる空間を大にするために、
該凹入側を扁平にする技術に関するものであり、大にさ
れた空間は、他の部材が配置されるために利用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to increase the space enclosed by the inside or concave side of the bend of a bend tube.
The present invention relates to a technique for flattening the recessed side, and the enlarged space is used for disposing other members.
【０００２】[0002]
【従来の技術】従来の扁平な湾曲管の成形方法は、通常
の湾曲管の成形方法と同様に、湾曲された素材管の内部
に砂、鋼球等の充填体を入れて管口を栓体で密閉し、素
材管の凹入側をパンチで凸出側に向けて加圧する手段が
用いられている。この方法によれば、充填体の出し入れ
や栓体の着脱に手間がかかって非能率であり、充填体の
充填が不完全の場合には凹入側に座屈が生じることがあ
る。2. Description of the Related Art The conventional method for molding a flat curved tube is similar to the method for molding a normal curved tube, in which a filler such as sand or steel balls is put inside a curved material tube to plug the tube mouth. A means for sealing the body tube and pressing the concave side of the material tube toward the convex side with a punch is used. According to this method, it takes a lot of time to take out and put in the filling body and to attach and detach the plug body, which is inefficient, and when the filling of the filling body is incomplete, buckling may occur on the recessed side.
【０００３】また、管の湾曲加工時に管が座屈するのを
防止するために可撓マンドレルを用いることは公知であ
る（例えば特開平３−１９３２２０、同３−２３８１２
３）が、湾曲管を更に成形加工するために可撓マンドレ
ルを用いる技術は知られていなかった。Further, it is known to use a flexible mandrel to prevent the tube from buckling during bending of the tube (for example, JP-A-3-193220 and 3-23812).
3), however, a technique using a flexible mandrel for further forming a curved tube has not been known.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、扁平湾曲管
を能率的に成形することを課題とする。SUMMARY OF THE INVENTION An object of the present invention is to efficiently mold a flat curved tube.
【０００５】[0005]
【課題を解決するための手段】前記課題を解決するため
の方法は、請求項１に記載したとおり、円弧状に湾曲し
た素材管の凸出側を、該凸出側の長手方向の曲率と同一
の長手方向の曲率をもち断面が扁平な成形面をもつダイ
で支持し、製品の扁平部内面の高さと同一高さの硬質材
よりなるブロック同士をリンク結合した可撓マンドレル
を素材管に挿入し、該扁平部の凹入側の長手方向の曲率
と同一の曲率を長手方向にもつ成形面を先端に設けたパ
ンチで、素材管の凹入側を前記可撓マンドレルに圧接さ
せることを特徴とする。As described in claim 1, a method for solving the above-mentioned problems is such that, as described in claim 1, the convex side of a material pipe curved in an arc shape is set to the longitudinal curvature of the convex side. A flexible mandrel, which is supported by a die that has the same longitudinal curvature and a flat molding surface in cross section, and links blocks made of hard material that are the same height as the inner surface of the flat part of the product to form a link It is possible to press the concave side of the raw material tube into pressure contact with the flexible mandrel with a punch having a molding surface at the tip which is inserted and has the same curvature in the longitudinal direction as the longitudinal curvature of the concave side of the flat portion. Characterize.
【０００６】また、前記方法を実施するための装置は、
請求項２に記載したとおり、円弧状に湾曲した素材管の
凸出側の長手方向の曲率と同一の長手方向の曲率をもち
断面が扁平な成形面をもつダイと、製品の扁平部内面の
高さと同一の高さをもつ可撓マンドレルと、該扁平部の
凹入側の長手方向の曲率と同一の曲率を長手方向にもつ
成形面を先端に設けたパンチとを備え、前記可撓マンド
レルは、複数個の硬質材よりなる短いブロックを連結し
てなり、各ブロックは、前面と後面の中央に凹所をも
ち、前後の凹所に挿入したリンクの両端をピンでブロッ
クに枢着し、ロッドの先端に連結したことを特徴とす
る。An apparatus for carrying out the method is also
As described in claim 2, a die having a molding surface having a flat cross section with the same longitudinal curvature as the longitudinal curvature of the protruding side of the material tube curved in an arc shape, and the inner surface of the flat portion of the product. A flexible mandrel having the same height as the height; and a punch having at its tip a molding surface having the same curvature in the longitudinal direction as the curvature in the longitudinal direction on the concave side of the flat portion. Consists of short blocks made of multiple hard materials.Each block has a recess in the center of the front and rear faces, and both ends of links inserted in the front and rear recesses are pivotally attached to the block with pins. , Is connected to the tip of the rod .
【０００７】[0007]
【作用】前記請求項１の手段によれば、素材管に可撓マ
ンドレルを挿入してダイ上に載置し、凹入部側をパンチ
で加圧することにより断面扁平な湾曲管が成形され、可
撓マンドレルを引抜くことにより作業が完了する。According to the first aspect of the invention, the flexible mandrel is inserted into the material tube and placed on the die, and the concave side is pressed by the punch to form a curved tube having a flat cross section. The work is completed by pulling out the flexible mandrel.
【０００８】また、前記請求項２の手段によれば、可撓
マンドレルは、短いブロック同士を中央でリンク結合し
ているから、素材管の湾曲に応じて高さ方向及び幅方向
に撓み易くすることができ、製品形状に対する順応性が
高く、挿入、引抜きが容易にできる。Further, according to the second aspect of the invention, since the flexible mandrel links the short blocks to each other at the center, the flexible mandrel is easily bent in the height direction and the width direction according to the bending of the material pipe. In addition, it is highly adaptable to the product shape and can be easily inserted and withdrawn.
【０００９】[0009]
【実施例】以下、図面を参照して本発明の実施例を説明
する。図１（ａ）（ｂ）は、前工程で湾曲加工された素
材管Ｗ1の正面図及び平面図であり、端部１、２の中間
に湾曲部３が設けられ、その凸出側４と凹入側５の代表
的な曲率半径はＲ1とＲ2である。図２（ａ）（ｂ）は扁
平加工後の製品Ｗ2の正面図及び平面図であり、曲率半
径Ｒ3の押込み面６を形成することにより扁平部７が成
形される。該扁平部７の両側には、深さを次第に減じる
中間部８、９が形成されている。Embodiments of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are a front view and a plan view of a material pipe W 1 that has been curved in the previous step, in which a curved portion 3 is provided between the end portions 1 and 2, and a protruding side 4 thereof The typical radii of curvature of the concave side 5 are R 1 and R 2 . 2A and 2B are a front view and a plan view of the product W 2 after the flattening process, and the flat portion 7 is formed by forming the pressing surface 6 having the radius of curvature R 3 . On both sides of the flat portion 7, intermediate portions 8 and 9 of which the depth is gradually reduced are formed.
【００１０】図３は金型の正面図で１０はダイ、１１は
パンチであり、それぞれに成形面１２、１３が凹設され
ており、成形面１２に仮想線で示す素材管Ｗ1がセット
される。ダイ１０の成形面１２の中央部には、素材管Ｗ
1の長手方向に曲率半径Ｒ1と同じ曲率半径Ｒ1をもち、
管径方向には扁平にされた扁平成形部１２ａが設けら
れ、パンチ１１の成形面１３には、長手方向の曲率半径
がＲ3の扁平成形部１３ａとテーパ状の中間成形部１３
ｂ、１３ｃが設けられる。FIG. 3 is a front view of the die, in which 10 is a die, 11 is a punch, and molding surfaces 12 and 13 are respectively recessed, and a material tube W 1 shown by an imaginary line is set on the molding surface 12. To be done. At the center of the molding surface 12 of the die 10, the material pipe W
The radius of curvature R 1 is the same as the radius of curvature R 1 in the longitudinal direction of 1 ,
A flattened flattened shape portion 12a is provided in the pipe radial direction, and a flattened flattened portion 13a having a radius of curvature R 3 in the longitudinal direction and a tapered intermediate shaped portion 13 are provided on the shaping surface 13 of the punch 11.
b and 13c are provided.
【００１１】図４（ａ）（ｂ）は可撓マンドレル１４の
正面図及び平面図であり、該可撓マンドレル１４は、前
後方向の寸法が短いブロック１６、１７、１８、１９を
リンク結合してロッド２０の先端に連結したものであ
り、両端のブロック１６、１９の横幅は中間のブロック
１７、１８より狭くされ、成形加工後マンドレル１４を
抜取り易くしてある。各ブロック１６〜１９には、その
前後面である対向面の中央に凹所２１が設けられ、かつ
該凹所２１を横切るピン孔２２が穿設されている。そし
て、両端にピン孔をもつリンク２３がピン孔を通るピン
２４で連結される。後端のブロック１６とロッド２０も
同様に連結される。各ブロック１６〜１９の高さは、製
品Ｗ2の扁平部の高さで決まり、また各ブロック１６〜
１９の横幅は製品Ｗ2の中間部８及び端部１を通過でき
る寸法とされる。4 (a) and 4 (b) are a front view and a plan view of the flexible mandrel 14, wherein the flexible mandrel 14 is linked with blocks 16, 17, 18, 19 having a short dimension in the front-rear direction. The blocks 16 and 19 on both ends are made narrower in width than the blocks 17 and 18 in the middle, so that the mandrel 14 can be easily removed after the molding process. Each of the blocks 16 to 19 is provided with a recess 21 at the center of the front and rear faces thereof, and a pin hole 22 is formed so as to cross the recess 21. Then, links 23 having pin holes at both ends are connected by pins 24 passing through the pin holes. The block 16 at the rear end and the rod 20 are similarly connected. The height of each block 16 to 19 is determined by the height of the flat portion of the product W 2 , and each block 16 to 19
The width of 19 is sized so that it can pass through the intermediate portion 8 and the end portion 1 of the product W 2 .
【００１２】この可撓マンドレル１４を素材管Ｗ1に挿
入し、該素材管Ｗ1を図５に示すようにダイ１０にセッ
トし、図６に示すようにパンチ１１を下降させると、素
材管Ｗ1は、成形面１２ａ、１３ａの孔型に相当する形
状に成形され、この際、マンドレル１４は、素材管Ｗ1
の凹入側５が座屈して内側へ過度に屈曲するのを防止す
る。図７は成形後の扁平部７の断面を示す。[0012] inserting the flexible mandrel 14 to the material pipe W 1, it was set in the die 10 as shown in FIG. 5 the plain material tube W 1, is lowered punch 11 as shown in FIG. 6, the material tube W 1 is formed into a shape corresponding to the hole shape of the forming surfaces 12a and 13a, and at this time, the mandrel 14 is formed by the material pipe W 1
It prevents the recessed side 5 from buckling and excessively bending inward. FIG. 7 shows a cross section of the flat portion 7 after molding.
【００１３】成形後、可撓マンドレル１４を抜取り、パ
ンチ１１を上昇することにより製品Ｗ2を取出すことが
できる。After molding, the flexible mandrel 14 is pulled out, and the punch 11 is raised to take out the product W 2 .
【００１４】[0014]
【発明の効果】以上の説明から明らかなとおり、請求項
１の発明によれば、素材管に可撓マンドレルを挿入及び
抜取りする手間を要するだけであるから、極めて能率的
に作業をすることができコストを低下できる。また硬い
可撓マンドレルにより扁平部の座屈を完全に防止できる
利点を有する。As is apparent from the above description, according to the invention of claim 1, it is only necessary to insert and remove the flexible mandrel into and from the material pipe, and therefore the work can be performed extremely efficiently. The cost can be reduced. Further, it has an advantage that the buckling of the flat portion can be completely prevented by the hard flexible mandrel.
【００１５】また、請求項２の発明によれば、可撓マン
ドレルは、各ブロックの中央をリンク結合しているか
ら、高さ方向のみならず幅方向にも撓み易くすることが
でき、素材管が３次元的に湾曲したものであっても、挿
入、抜取りが容易にできる利点を有する。According to the second aspect of the present invention, since the flexible mandrel is linked to the center of each block, the flexible mandrel can be easily bent not only in the height direction but also in the width direction. Even if it is a three-dimensionally curved one, it has the advantage that it can be easily inserted and removed.
【図１】 素材管を示し（ａ）は正面図、（ｂ）は平面
図FIG. 1 shows a material tube (a) is a front view and (b) is a plan view.
【図２】 製品を示し（ａ）は正面図、（ｂ）は平面図FIG. 2 shows a product, (a) is a front view, and (b) is a plan view.
【図３】 金型の正面図[Figure 3] Front view of the mold
【図４】 可撓マンドレルを示し（ａ）は正面図、
（ｂ）は平面図FIG. 4 shows a flexible mandrel (a) is a front view,
(B) is a plan view
【図５】 素材管をセットした金型の正面図[Figure 5] Front view of the mold with the material tube set
【図６】 加工後の金型の正面図FIG. 6 is a front view of the mold after processing.
【図７】 図６のVII−VII線断面図7 is a sectional view taken along line VII-VII of FIG.
Ｗ1 素材管 Ｗ2 製品
３ 湾曲部
４ 凸出側 ５ 凹入側
６ 押込み面
７ 扁平部 ８、９ 中間部 １
２、１３ 成形面
１４ 可撓マンドレル １６〜１９ ブロック
２３ リンクW 1 material tube W 2 product
3 Curved part 4 Convex side 5 Concave side
6 Pushing surface 7 Flat part 8, 9 Intermediate part 1
2, 13 Molding surface 14 Flexible mandrel 16-19 block
23 links
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−327320（ＪＰ，Ａ) 国際公開92／12812（ＷＯ，Ａ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B21D 9/08 B21D 7/06 B21D 9/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-4-327320 (JP, A) International publication 92/12812 (WO, A1) (58) Fields investigated (Int.Cl. 7 , DB name) B21D 9/08 B21D 7/06 B21D 9/00
Claims (2)
側（４）を、該凸出側（４）の長手方向の曲率と同一の
長手方向の曲率をもち断面が扁平な成形面（１２ａ）を
もつダイ（１０）で支持し、製品（Ｗ2）の扁平部
（７）の内面の高さと同一高さの硬質材よりなるブロッ
ク同士をリンク結合した可撓マンドレル（１４）を素材
管（Ｗ1）に挿入し、該扁平部（７）の凹入側の長手方
向の曲率と同一の曲率を長手方向にもつ成形面（１３
ａ）を先端に設けたパンチ（１１）で、素材管（Ｗ1）
の凹入側（５）を前記可撓マンドレル（１４）に圧接さ
せることを特徴とする、扁平断面をもつ湾曲管の成形方
法。 1. The convex side (4) of the material pipe (W 1 ) curved in an arc shape has the same longitudinal curvature as the longitudinal curvature of the convex side (4) and has a flat cross section. A block made of a hard material supported by a die (10) having a molding surface (12a) and having the same height as the inner surface of the flat portion (7) of the product (W 2 ).
A flexible mandrel (14) in which the two members are linked to each other is inserted into the material pipe (W 1 ), and a molding surface having the same curvature in the longitudinal direction as that of the recessed side of the flat portion (7) in the longitudinal direction ( Thirteen
With a punch (11) provided at the tip of a), the material tube (W 1 )
A method for forming a curved tube having a flat cross section, wherein the concave side (5) of (1) is pressed against the flexible mandrel (14).
側（４）の長手方向の曲率と同一の長手方向の曲率をも
ち断面が扁平な成形面（１２ａ）をもつダイ（１０）
と、製品（Ｗ2）の扁平部（７）の内面の高さと同一の
高さをもつ可撓マンドレル（１４）と、該扁平部（７）
の凹入側の長手方向の曲率と同一の曲率を長手方向にも
つ成形面（１３ａ）を先端に設けたパンチ（１１）とを
備え、前記可撓マンドレル（１４）は、複数個の硬質材
よりなる短いブロック（１６〜１９）を連結してなり、
各ブロック（１６〜１９）は、前面と後面の中央に凹所
（２１）をもち、前後の凹所（２１）に挿入したリンク
の両端（２３）をピン（２２）でブロック（１６〜１
９）に枢着し、ロッド（２０）の先端に連結したことを
特徴とする、扁平断面をもつ湾曲管の成形装置。2. A die (12a) having a molding surface (12a) having the same longitudinal curvature as the longitudinal curvature of the protruding side (4) of the material tube (W 1 ) curved in an arc shape. 10)
A flexible mandrel (14) having the same height as the inner surface of the flat portion (7) of the product (W 2 ), and the flat portion (7)
The flexible mandrel (14) is provided with a plurality of hard materials, and a punch (11) provided at the tip with a molding surface (13a) having the same curvature in the longitudinal direction as the longitudinal curvature of the recessed side. Consisting of short blocks (16-19) of
Each block (16 to 19) has a recess (21) at the center of the front surface and the rear surface, and both ends (23) of the links inserted in the front and rear recesses (21) are blocked (16 to 1) with pins (22).
9) A device for forming a curved tube having a flat cross section, which is pivotally attached to the rod 9 and is connected to the tip of a rod (20) .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32779193A JP3363975B2 (en) | 1993-12-24 | 1993-12-24 | Method and apparatus for forming curved tube with flat cross section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32779193A JP3363975B2 (en) | 1993-12-24 | 1993-12-24 | Method and apparatus for forming curved tube with flat cross section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07178470A JPH07178470A (en) | 1995-07-18 |
| JP3363975B2 true JP3363975B2 (en) | 2003-01-08 |
Family
ID=18203032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32779193A Expired - Fee Related JP3363975B2 (en) | 1993-12-24 | 1993-12-24 | Method and apparatus for forming curved tube with flat cross section |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3363975B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20050159A1 (en) * | 2005-02-04 | 2006-08-05 | Dl Radiators Spa | PROCEDURE AND BENDING SYSTEM TO PROVIDE A PREFIXED BEND TO A TUBULAR FLAT METALLIC ELEMENT PARTICULARLY OF THE TYPE USED FOR THE HEATING FLUID CIRCUIT OF A RADIATOR AND METALLIC ELEMENT THEREFORE |
| JP4418838B2 (en) * | 2005-03-30 | 2010-02-24 | 株式会社インフェック | Metal tube flattening equipment |
| CN102921801B (en) * | 2012-11-06 | 2015-03-25 | 柳州市昌河模具厂 | Molding method for trailing arm beam of rear axle bracket assembly of automobile |
-
1993
- 1993-12-24 JP JP32779193A patent/JP3363975B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07178470A (en) | 1995-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2701878B2 (en) | Method of manufacturing a partially reinforced frame member having a multilateral cross section | |
| JPH07115091B2 (en) | Box Forming Method | |
| US5431326A (en) | Method of forming a tubular member with separate flange | |
| JP3832927B2 (en) | Axle case manufacturing method | |
| JP3995182B2 (en) | Method and apparatus for manufacturing hollow rack bar | |
| JPH04266438A (en) | Method for manufacturing end of claw for excavation | |
| JP4286916B2 (en) | Improved puzzle lock compression ring | |
| JP3363975B2 (en) | Method and apparatus for forming curved tube with flat cross section | |
| JP3114918B2 (en) | Manufacturing method of curved hollow pipe | |
| JP2003103314A (en) | Method and apparatus for manufacturing metal bent pipe having bulge | |
| US5513513A (en) | Metal forming tool | |
| US6584821B1 (en) | Self-aligning non-pinching hydroforming dies | |
| JP3444973B2 (en) | Pipe bending method and apparatus | |
| JP3780428B2 (en) | Bending press molding mold apparatus for square pipe and bent corner pipe manufactured by this molding mold apparatus | |
| JPH08192238A (en) | Frame forming method | |
| JP2002153917A (en) | Bulging method | |
| JP4546592B2 (en) | Metal pipe bending method and metal bent pipe | |
| JP2001300652A (en) | Piercing method and die in hydraulic bulging of metal tube | |
| JPH11197758A (en) | Deformed metallic tube stock, its manufacture, and manufacture of deformed bend metallic tube | |
| JPS62104644A (en) | Manufacture of yoke universal joint having shank | |
| JP2687611B2 (en) | Width reduction pressing method and press die | |
| CN215745883U (en) | Multi-wedge belt wheel machining and pre-forming tool | |
| JPS5973132A (en) | Forming method of bent pipe by bulging with liquid pressure | |
| JP3593381B2 (en) | Pipe flattening method and die used for it | |
| JP2539984B2 (en) | Method for manufacturing rectangular steel pipe by cold drawing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071025 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081025 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091025 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101025 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111025 Year of fee payment: 9 |
|
| LAPS | Cancellation because of no payment of annual fees |