JP6366144B2 - Octagonal pipe swaging method and octagonal pipe - Google Patents

Octagonal pipe swaging method and octagonal pipe Download PDF

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JP6366144B2
JP6366144B2 JP2015232881A JP2015232881A JP6366144B2 JP 6366144 B2 JP6366144 B2 JP 6366144B2 JP 2015232881 A JP2015232881 A JP 2015232881A JP 2015232881 A JP2015232881 A JP 2015232881A JP 6366144 B2 JP6366144 B2 JP 6366144B2
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秀幸 財津
秀幸 財津
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株式会社新三興鋼管
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この発明は、八角パイプをスエージ加工するスエージ加工方法、及びこの加工方法により製造された八角パイプに関する。   The present invention relates to a swaging method for swaging an octagonal pipe, and an octagonal pipe manufactured by the processing method.

例えば農業用ハウスの骨組み等として、鋼パイプが広く採用されている。この種の農業用ハウスの骨組みは、例えば図７に簡略化して示した農業用ハウス骨組み１０のように、ハウス長手方向に間隔をおいて複数設置したアーチ状パイプ１１と、ハウス長手方向に水平に配され前記各アーチ状パイプ１１と交差する部分で図示せぬ固定手段によりアーチ状パイプ１１に固定されて、各アーチ状パイプ１１間の間隔を保持する複数の水平パイプ１２とで組み立てることが広く行われている。
このハウス骨組みの特に水平パイプ１２は、ハウス奥行の長さであり長尺となるので、通常複数の直状パイプを連結して用いる。また、アーチ状パイプについても通常、パイプ同士を連結する部分がある。 For example, steel pipes are widely used as frameworks for agricultural houses. The framework of this type of agricultural house is composed of, for example, an agricultural house framework 10 shown in a simplified form in FIG. And a plurality of horizontal pipes 12 which are fixed to the arched pipes 11 by fixing means (not shown) at the portions intersecting with the arched pipes 11 and maintaining the intervals between the arched pipes 11. Widely done.
Since especially the horizontal pipe 12 of this house framework is the length of a house depth and becomes long, normally, it connects and uses a some straight pipe. Further, the arched pipe usually has a portion for connecting the pipes together.

上記水平パイプ１２におけるパイプ同士の連結、あるいはアーチ状パイプ１１におけるパイプ同士の連結は、連結すべき個々のパイプについて、その一端側をスエージ加工により縮径して先細り状にし、この一端側の先細り部を他端側の縮径されていない通常パイプ断面部に差し込むことで行うのが一般的である（特許文献１の図７）。
なお、先端部を先細り状にする場合、先細り部の全体をテーパ状にする場合と、先細り部の先端側に所定長さの均一細径部を設け通常パイプ断面に移行するテーパ状部分を短くする場合とがある。 The connection between the pipes in the horizontal pipe 12 or the connection between the pipes in the arched pipe 11 is made by tapering the one end side of each pipe to be connected by reducing the diameter by swaging. This is generally performed by inserting the portion into a normal pipe cross-sectional portion that is not reduced in diameter on the other end side (FIG. 7 of Patent Document 1).
In addition, when the tip is tapered, the entire tapered portion is tapered, and the tapered portion that transitions to the normal pipe cross section is shortened by providing a uniform small diameter portion at the tip of the tapered portion. There is a case to do.

ところで、農業用ハウスの骨組みのパイプとして、一般には丸パイプが用いられるが、八角パイプ（八角形断面のパイプ）を用いる場合もある（特許文献２）。   By the way, although a round pipe is generally used as a framework pipe of an agricultural house, an octagonal pipe (a pipe having an octagonal cross section) may be used (Patent Document 2).

特開２００３−７７JP 2003-77 A 特開２０１５−３９３５８JP2015-39358

丸パイプであれば、縮径して先細り状にするスエージ加工も容易であるが、八角パイプの場合は断面が整った先細り状にスエージ加工することは必ずしも簡単でない。
本願発明者は、通常の発想で、すなわち、八角パイプをダイス内面の断面形状がパイプ長手方向に八角形の相似形のままテーパ状に小さくなるダイスを用いて先細り状にスエージ加工する実験を行ったが、各辺が座屈して平坦な辺からなる縮径八角断面とならず、しかも、各辺が不揃いに座屈して周方向に均等な断面形状（各辺が均等な形状）とならず、良好な外観の先細り八角パイプが得られなかった。
また、縮径加工部が周方向に不均等な断面形状のまま縮径されていない通常八角パイプ断面に移行する先細り八角パイプでは、一方の八角パイプの先細り部を、他方の八角パイプの端部の縮径されていない通常八角パイプ断面部に差し込んで連結する際に、円滑な差込み連結ができない場合がある。 In the case of a round pipe, it is easy to swage to reduce the diameter and taper, but in the case of an octagonal pipe, it is not always easy to swage into a tapered shape with a uniform cross section.
The inventor of the present application conducted an experiment in which an octagonal pipe was swaged into a tapered shape using a die having a tapered shape while the cross-sectional shape of the inner surface of the die was an octagonal similar shape in the longitudinal direction of the pipe. However, each side buckled and does not have a reduced diameter octagonal cross section consisting of flat sides, and each side does not buckle unevenly and does not have a uniform cross-sectional shape in the circumferential direction (each side has a uniform shape). A tapered octagon pipe with a good appearance was not obtained.
Also, in a tapered octagonal pipe that transitions to a normal octagonal pipe cross section where the diameter-reduced portion is not reduced in diameter in the circumferential direction, the tapered portion of one octagonal pipe is the end of the other octagonal pipe. When inserting and connecting to a normal octagonal pipe cross section where the diameter is not reduced, there may be cases where smooth insertion and connection are not possible.

本発明は上記事情に鑑みてなされたもので、八角パイプをスエージ加工により縮径加工する場合に、周方向に均等な断面形状で良好な外観の縮径八角断面を得ることができる八角パイプのスエージ加工方法、及びこの加工方法により製造された八角パイプ、特に先細りの八角パイプを得ることを目的とする。   The present invention has been made in view of the above circumstances, and when octagonal pipes are reduced in diameter by swaging, the octagonal pipe is capable of obtaining a reduced-diameter octagonal cross section having a good appearance with a uniform cross-sectional shape in the circumferential direction. It is an object to obtain a swage processing method and an octagonal pipe manufactured by this processing method, particularly a tapered octagonal pipe.

上記課題を解決する請求項１の発明は、金属製の八角パイプをスエージ加工する八角パイプのスエージ加工方法であって、
入口側において各辺が平坦な八角断面で、出口側において小径の八角形の８つの各辺の中央部に、入口側から出口側に向かって漸次突出量が増す態様でダイス中心側に突出する突出部を有するテーパ異形筒状内面のダイスに相対的に八角パイプを押し込んで、八角形の８つの各辺のそれぞれ中央部が内側に凹んだ異形八角断面形状に縮径加工することを特徴とする。 The invention of claim 1 for solving the above-mentioned problem is a method for swaging an octagonal pipe for swaging a metal octagonal pipe,
Each side has a flat octagonal cross section on the inlet side, and protrudes toward the center of the die in such a manner that the amount of protrusion gradually increases from the inlet side to the outlet side at the center of each of the eight sides of the small-diameter octagon on the outlet side. The octagonal pipe is relatively pushed into a die of a tapered deformed cylindrical inner surface having a protruding portion, and the diameter is reduced to a deformed octagonal cross-sectional shape in which each central portion of each of the eight sides of the octagon is recessed. To do.

請求項２は、請求項１の八角パイプのスエージ加工方法において、前記テーパ異形筒状内面における８つの辺のうちの直角二方向の４つの辺の前記突出部の突出高さを他の４つの辺の前記突出部の突出高さより高くしたダイスに相対的に八角パイプを押し込んで、縮径加工することを特徴とする。   According to a second aspect of the present invention, in the swage processing method for the octagonal pipe according to the first aspect, the protrusion heights of the protrusions on the four sides in two directions at right angles out of the eight sides on the tapered deformed cylindrical inner surface It is characterized in that the octagonal pipe is relatively pushed into a die which is higher than the protruding height of the protruding portion on the side to reduce the diameter.

請求項４の発明の八角パイプは、
請求項１又は２のスエージ加工法により製造された八角パイプであって、長い八角パイプの先端部がスエージ加工されて、先端部のみが八角形の８つの各辺のそれぞれ中央部に内側に凹んだ異形八角断面形状であることを特徴とする。 The octagonal pipe of the invention of claim 4 is
An octagonal pipe manufactured by the swage processing method according to claim 1 or 2, wherein a tip portion of a long octagonal pipe is swaged, and only the tip portion is recessed inward in the center of each of the eight sides of the octagon. It is characterized by an irregular octagonal cross-sectional shape.

請求項１の発明のスエージ加工方法によれば、周方向に均等な断面形状（各辺のパイプ中心に対する形状・距離が均等）で良好な外観の縮径八角断面（縮径された異形八角断面）を得ることができる。
したがって、このスエージ加工方法で、長い八角パイプの先端部を縮径八角断面とした先細りの八角パイプ（請求項４の八角パイプ）を製造した場合、この先細り八角パイプは、例えば農業用ハウスのパイプ骨組み用として用いて好適である。この場合、先細り部の縮径八角断面が周方向に均等な断面形状なので、一方の八角パイプの先細り部を、他方の八角パイプの端部の縮径されていない八角断面部に差し込んで連結する際に、円滑な差込み連結を行うことができる。 According to the swage processing method of the first aspect of the present invention, a reduced-diameter octagonal cross section (a reduced octagonal cross-section having a reduced diameter) having a uniform cross-sectional shape in the circumferential direction (the shape and distance from the pipe center of each side are equal) is good. ) Can be obtained.
Therefore, when a tapered octagonal pipe (octagonal pipe of claim 4) having a reduced octagonal cross section at the tip of a long octagonal pipe is manufactured by this swage processing method, the tapered octagonal pipe is, for example, a pipe for an agricultural house. It is suitable for use as a frame. In this case, since the reduced-diameter octagonal cross section of the tapered portion has a uniform cross-sectional shape in the circumferential direction, the tapered portion of one octagonal pipe is inserted into and connected to the non-reduced octagonal cross-sectional portion of the end of the other octagonal pipe. In doing so, a smooth plug connection can be achieved.

また、八角断面を維持したまま縮径された相似形八角断面にスエージ加工する場合の加工度と本発明加工方法により縮径された異形八角断面にスエージ加工する場合の加工度とを、それぞれ八角パイプとしての径（対向辺間の距離）を同一にして（素材八角パイプの径が同一かつ縮径された八角パイプの径も同一として）比較すると、本発明による異形八角断面の周長（板厚中心線に沿う周長）は相似形八角断面の周長より長いので、本発明加工方法によるスエージ加工の加工度の方が小さい。したがって、加工度が小さく済む本発明の加工方法は、主に加工設備の面に関して有利であると言える。   In addition, the degree of processing when swaging into a similar octagonal cross section reduced in diameter while maintaining the octagonal section and the degree of processing when swaging into a deformed octagonal cross section reduced in diameter according to the processing method of the present invention are respectively When the pipe diameter (distance between opposite sides) is made the same (the diameter of the material octagonal pipe is the same and the diameter of the reduced octagonal pipe is also the same), the circumference of the odd-shaped octagonal cross section according to the present invention (plate) (Perimeter along the thickness center line) is longer than the perimeter of the similar octagonal cross section, so the degree of processing of swaging by the processing method of the present invention is smaller. Therefore, it can be said that the processing method of the present invention that requires only a small degree of processing is advantageous mainly in terms of processing equipment.

請求項２のように、テーパ異形筒状内面における８つの辺のうちの直角二方向の４つの辺の前記突出部の突出高さを他の４つの辺の前記突出部の突出高さより高くしたダイスを用いることで、さらに周方向に均等な断面形状で良好な外観の縮径八角断面を容易に得ることができる。   As in claim 2, the protruding height of the protruding portion of the four sides in two directions at right angles out of the eight sides of the tapered deformed cylindrical inner surface is made higher than the protruding height of the protruding portion of the other four sides. By using a die, it is possible to easily obtain a reduced-diameter octagonal cross section having a good external appearance with a uniform cross-sectional shape in the circumferential direction.

本発明の一実施例のスエージ加工方法で用いるダイスを示すもので、（イ）は正面図、（ロ）は（イ）の断面図でありＡ−Ａ断面、Ｂ-Ｂ断図、Ｃ−Ｃ断面を共に示した図、（ハ）は実施例でスエージ加工の対象とする八角パイプの断面図である。The dice | dies used with the swage processing method of one Example of this invention are shown, (A) is a front view, (B) is sectional drawing of (A), AA cross section, BB sectional drawing, C- The figure which showed both C cross sections, (c) is a cross-sectional view of the octagonal pipe which is the object of swaging in the embodiment. （イ）〜（ニ）は図１のダイスを用いて八角パイプのスエージ加工をする加工工程を説明する図、（ホ）は（ニ）のＥ−Ｅ断面図である。(A)-(d) is a figure explaining the process which swages an octagonal pipe using the dice | dies of FIG. 1, (e) is EE sectional drawing of (d). （イ）は図２（ニ）におけるＤ-Ｄ拡大断面図、（ロ）は図２（ニ）におけるＥ−Ｅ拡大断面図（図２（ホ）を拡大したもの）である。(A) is a DD enlarged sectional view in FIG. 2 (d), (b) is an EE enlarged sectional view in FIG. 2 (d) (an enlarged view of FIG. 2 (e)). 上記スエージ加工方法により加工された先端部縮径八角パイプの先端近傍の斜視図である。It is a perspective view of the front-end | tip vicinity of the front-end | tip part diameter reduction octagon pipe processed by the said swage processing method. それぞれ一端側に先細り部を形成した２つの先端部縮径八角パイプどうしを連結する場合の連結状態を説明する図である。It is a figure explaining the connection state in the case of connecting the two front-end | tip diameter reduction octagonal pipes which each formed the taper part in the one end side. 両端部に先細り部を形成した短尺の先端部縮径八角パイプの両側に、先細りのない通常八角パイプの端部を連結する場合を説明する図である。It is a figure explaining the case where the edge part of a normal octagon pipe without a taper is connected with the both sides of the short tip part diameter reduction octagon pipe which formed the taper part in both ends. 上記先端部縮径八角パイプを用いて組立てようとする農業用ハウスのパイプ骨組みの一例を示す斜視図である。It is a perspective view which shows an example of the pipe framework of the agricultural house which it is going to assemble using the said front-end | tip reduced diameter octagonal pipe.

以下、本発明の八角パイプのスエージ加工方法、及び八角パイプを実施するための形態について、図面を参照して説明する。   Hereinafter, a method for swaging an octagonal pipe and an embodiment for implementing the octagonal pipe of the present invention will be described with reference to the drawings.

図１は本発明の一実施例のスエージ加工方法で用いるダイス１を示すもので、（イ）は正面図、（ロ）は（イ）の断面図であり、Ａ−Ａ断面、Ｂ-Ｂ断図、Ｃ−Ｃ断面を共に示した図（それぞれＡ−Ａ、Ｂ−Ｂ、Ｃ−Ｃで示す）、（ハ）は実施例でスエージ加工対象とする八角パイプ２の断面図である。
図２は図１のダイス１を用いて八角パイプ２のスエージ加工をする加工工程を説明する図であり、（イ）〜（ニ）の順に加工される。
図３（イ）は図２（ニ）におけるＤ-Ｄ拡大断面図、（ロ）は図２（ニ）におけるＥ−Ｅ拡大断面図（図２（ホ）を拡大したもの）、（ハ）は先細り部の断面図（ハッチングは省略）である。 1A and 1B show a die 1 used in a swaging method according to an embodiment of the present invention. FIG. 1A is a front view, FIG. 1B is a sectional view of FIG. FIG. 2 is a cross-sectional view of the octagonal pipe 2 to be swaged in the embodiment. FIG.
FIG. 2 is a diagram for explaining a machining process for swaging the octagonal pipe 2 using the die 1 of FIG. 1, and the machining is performed in the order of (a) to (d).
3 (a) is a DD enlarged sectional view in FIG. 2 (d), (b) is an EE enlarged sectional view in FIG. 2 (d) (an enlarged view of FIG. 2 (e)), and (c). FIG. 3 is a cross-sectional view of a tapered portion (hatching is omitted).

図示例でスエージ加工の対象とする八角パイプ２は、板厚ｔ＝１．６ｍｍ、外径４２．７ｍｍの素管（丸パイプ）をロール成形機で八角管に整形したもので、対角線間距離ｈが約３９．５ｍｍである。
図示例のダイス１は、入口側の開口位置（図１（ロ）で右側端部）の円形内面（断面内面）から図中の概ねＦ−Ｆ断面位置までの間に八角内面（素材の八角パイプ２の外面形状に対応）に漸変する導入内面Ｓ１を有し、前記概ねＦ−Ｆ断面位置の八角内面から出口側の最終絞り位置の異形八角内面３（図１（ロ）参照）まで径がテーパ状に縮小するテーパ異形筒状内面Ｓ２を有する。
実施例では、Ａ−Ａ断面の内面間距離ａ＝３０．５ｍｍ、Ｂ−Ｂ断面の内面間距離ｂ＝３４．０ｍｍ、Ｃ−Ｃ断面の内面間距離ｃ３８．４７ｍｍである。また、ダイス１の外径Ｄは７０ｍｍ、幅Ｗは４０ｍｍである。 The octagonal pipe 2 to be swaged in the illustrated example is a straight pipe (round pipe) having a thickness t = 1.6 mm and an outer diameter of 42.7 mm, which is shaped into an octagonal pipe by a roll forming machine. h is about 39.5 mm.
The dice 1 in the illustrated example has an octagonal inner surface (an octagon of material) between the circular inner surface (cross-sectional inner surface) of the opening position on the inlet side (the right end portion in FIG. 1 (b)) and the FF cross-sectional position in the drawing. pipe 2 corresponding to an outer surface shape) to have introduced the inner surface S 1 of graded, the generally F-F sectional position irregular octagonal inner surface 3 of the final stop position of the outlet side from the octagonal inner surface (FIG. 1 (b) see) diameter until having a tapered profiled tubular inner surface S 2 be reduced in a tapered shape.
In the embodiment, the distance between the inner surfaces of the AA cross section is 30.5 mm, the distance between the inner surfaces of the BB cross section is b = 34.0 mm, and the distance between the inner surfaces of the CC cross section is c.38.47 mm. The outer diameter D of the die 1 is 70 mm, and the width W is 40 mm.

図１（イ）に示すように、前記異形八角内面３は、Ａ−Ａ断面位置とこれと直交する方向との４辺の中央部にダイス中心側に突出する突出部３ａを有し、Ｂ-Ｂ断面とこれと直交する方向との４辺の中央部にダイス中心側に突出する突出部３ｂを有し、前記２つの突出部３ａ、３ｂの中間部（Ｃ−Ｃ断面位置）に位置する８カ所に凹所３ｃを有する。すなわち、前記異形八角内面３は、入口側において各辺が平坦な八角断面で、出口側において小径の八角形の８つの各辺の中央部に、入口側から出口側に向かって漸次突出量が増す態様でダイス中心側に突出する突出部３ａ、３ｂを有している。前記突出部３ａは前記突出部３ｂの高さより高くしている（ａ寸法とｂ寸法との差）。
８つの各辺の突出部の突出高さを同じにしてもよいが、直角二方向の４つの辺の突出部３ａの突出高さを他の４つの辺の突出部３ｂの突出高さより高くすることで、すなわち交互に隣接する辺の突出部の突出高さを異ならせることで、各辺が変形がそれぞれ安定して行われ易くなる。 As shown in FIG. 1 (a), the odd-shaped octagonal inner surface 3 has a protrusion 3a protruding toward the center of the die at the center of four sides of the AA cross-sectional position and the direction orthogonal thereto, A protrusion 3b protruding toward the center of the die is provided at the center of the four sides of the -B cross section and the direction orthogonal thereto, and is positioned at the middle part (CC cross section position) of the two protrusions 3a and 3b. There are recesses 3c at 8 places. That is, the odd-shaped octagonal inner surface 3 has an octagonal cross section with flat sides on the inlet side, and gradually protrudes from the inlet side to the outlet side at the center of each of the eight sides of the small-diameter octagon on the outlet side. protrusion 3a protruding die roll center side in a manner to increase, and a 3b. The protrusion 3a is higher than the height of the protrusion 3b (difference between the dimension a and the dimension b).
Although the protrusion heights of the protrusions on each of the eight sides may be the same, the protrusion heights of the protrusions 3a on the four sides in the two directions at right angles are made higher than the protrusion heights of the protrusions 3b on the other four sides. In other words, by making the protrusion heights of the protrusions of the adjacent sides alternately different, each side can be easily deformed stably.

上記のダイス１を用いて対象とする八角パイプ２のスエージ加工を行う場合、例えば図２（イ）〜（ニ）のように、八角パイプ２をクランプ５で固定的に把持し、ダイス１を八角パイプ２の先端部に押し込むと、八角パイプ２の先端部がダイス１の前記導入内面Ｓ１で案内された後、前記テーパ異形筒状内面Ｓ２の形状に沿って絞られて、図３（ロ）（図２（ホ）も同じ）、（ハ）に示すように、先端部の先細り部２ａが、八角形の８つの各辺のそれぞれ中央部に内側に凹んだ凹部ｐ、ｑを有する縮径された異形八角断面（縮径八角断面）となる。４つの辺の凹部ｐはダイス内面の突出部３ａに対応し、他の４つの辺の凹部ｑはダイス内面の突出部３ｂに対応し、凹部ｐの深さは凹部ｑより深い。
これにより、図４に斜視図でも示すように、先端側の先細り部２ａにおける平行縮径部２ａ１からテーパ状縮径部分２ａ２を経て縮径されていない八角パイプ部分２ｂに移行する先細り八角パイプ２’が得られる。
なお、ダイス１を、その出口端が八角パイプ２の先端に達した時点で止めると、全体が
テーパ状縮径部分である先細り八角パイプが得られる。
なお、図示例では八角パイプ２を固定しダイス１を移動させたが、ダイス１を固定し八角パイプ２を移動させてスエージ加工してもよい。すなわち、ダイスと八角パイプとが相対的に接近する動作であればよい。 When swaging the target octagonal pipe 2 using the above-described die 1, the octagonal pipe 2 is fixedly held by the clamp 5 as shown in FIGS. pushing the tip of the octagonal pipe 2, after the leading end portion of the octagonal pipe 2 is guided by the introducing the inner surface S 1 of the die 1, it is throttled along the shape of the tapered profiled tubular inner surface S 2, FIG. 3 (B) (same as in FIG. 2 (e)), as shown in (c), the tapered portion 2a of the tip portion is provided with recesses p and q recessed inwardly at the center of each of the eight sides of the octagon. The deformed octagonal cross section having a reduced diameter (reduced octagonal cross section) is obtained. The recesses p on the four sides correspond to the protrusions 3a on the inner surface of the die, the recesses q on the other four sides correspond to the protrusions 3b on the inner surface of the die, and the depth of the recesses p is deeper than the recesses q.
Thus, as shown in perspective view in FIG. 4, tapered octagonal migrating octagonal pipe section 2b that is not reduced in diameter through a tapered reduced diameter portion 2a 2 from the parallel reduced diameter portion 2a 1 of the distal end of the tapered portion 2a Pipe 2 'is obtained.
If the die 1 is stopped when the outlet end reaches the tip of the octagonal pipe 2, a tapered octagonal pipe whose whole is a tapered reduced diameter portion is obtained.
In the illustrated example, the octagonal pipe 2 is fixed and the die 1 is moved, but the dice 1 may be fixed and the octagonal pipe 2 may be moved and swaged. That is, it is sufficient if the die and the octagonal pipe are relatively close to each other.

上記の先細り八角パイプ２’を例えば図７の農業用ハウスの骨組み材として用いて、ハウス骨組みを組み立てる場合、主として、ハウス奥行分の長尺の水平パイプ１２を構成する個別パイプとして用いる。
この場合、先細り八角パイプ２’同士の連結は、図５に示すように、連結すべき一方の先細り八角パイプ２’（２１’）の一端側の先細り部２ａを、他方の先細り八角パイプ２’（２２’）の他端側の縮径されていない通常八角パイプ断面部２ｂに差し込むことで行う。
この場合、先細り部２ａの縮径八角断面の各辺が周方向に均等な断面形状（各辺のパイプ中心に対する形状・距離が均等）なので、一方の八角パイプ２’（２１’）の先細り部２ａを、他方の八角パイプ２’（２２’）の端部の縮径されていない八角断面部２ｂに差し込んで連結する際に、円滑な差込み連結を行うことができる。 When the above-mentioned tapered octagonal pipe 2 ′ is used, for example, as the frame material of the agricultural house shown in FIG. 7, the house frame is mainly used as an individual pipe constituting the long horizontal pipe 12 corresponding to the depth of the house.
In this case, as shown in FIG. 5, the tapered octagonal pipes 2 ′ are connected to each other at one end of the tapered octagonal pipe 2 ′ (2 1 ′) to be coupled with the other tapered octagonal pipe 2. It is carried out by inserting it into the normal octagonal pipe cross section 2b which is not reduced in diameter on the other end side of '(2 2 ').
In this case, since each side of the reduced-diameter octagonal cross section of the tapered portion 2a has a uniform cross-sectional shape in the circumferential direction (the shape and distance of each side with respect to the pipe center are equal), the taper of one octagonal pipe 2 '(2 1 ') When the portion 2a is inserted and connected to the non-reduced octagonal cross-sectional portion 2b at the end of the other octagonal pipe 2 ′ (2 2 ′), smooth insertion connection can be performed.

また、八角断面を維持したまま縮径された相似形八角断面にスエージ加工する場合の加工度と本発明加工方法により縮小された異形八角断面にスエージ加工する場合の加工度とを、それぞれ八角パイプとしての径（対向辺間の距離）を同一にして（素材八角パイプの径が同一かつ縮径された八角パイプの径も同一として）比較すると、本発明による異形八角断面の周長（板厚中心線に沿う周長）は相似形八角断面の周長より長いので、本発明加工方法によるスエージ加工の加工度の方が小さい。したがって、加工度が小さく済む本発明の加工方法は、主に加工設備の面に関して有利であると言える。   In addition, the degree of processing when swaging into a similar octagonal cross section reduced in diameter while maintaining the octagonal cross section and the degree of processing when swaging into a deformed octagonal cross section reduced by the processing method of the present invention, respectively, When comparing the same diameter (distance between opposite sides) (with the same diameter of the material octagonal pipe and the same diameter of the reduced octagonal pipe), the perimeter of the odd-shaped octagonal section according to the present invention (plate thickness) Since the perimeter along the center line is longer than the perimeter of the similar octagonal cross section, the degree of processing of swaging by the processing method of the present invention is smaller. Therefore, it can be said that the processing method of the present invention that requires only a small degree of processing is advantageous mainly in terms of processing equipment.

アーチ状パイプ１１においても、１本のパイプをアーチ状にするのでなく、例えば２本の半アーチ状パイプを頂部で連結してアーチ状にする場合には、例えば片側の半アーチ状パイプの端部にスエージ加工による先細り部２ａを形成することで、アーチ頂部において、図５に示したような差込み連結をすることができる。
なお、図６に簡略化して示すように両端部に先細り部２ａを形成した短尺の両側先細り八角パイプ２”を用いる場合には、先細り部を持たない通常八角パイプによる２つの半アーチ状パイプを前記両側先細り八角パイプ２”を介在させて連結することができる。 Also in the arched pipe 11, when one pipe is not arched, for example, when two semiarched pipes are connected at the top to form an arched shape, for example, the end of one half arched pipe is used. By forming the tapered portion 2a by swaging in the portion, the insertion connection as shown in FIG. 5 can be performed at the top of the arch.
As shown in a simplified manner in FIG. 6, when using a short double-sided taper octagonal pipe 2 ″ having tapered portions 2a at both ends, two semi-arched pipes made of ordinary octagonal pipes having no taper are used. The two side taper octagonal pipes 2 ″ can be connected with each other.

上述の実施例では、農業用ハウスの骨組み材として用いる場合について説明したが、それに限らず、種々の用途の八角パイプに適用することができる。   In the above-described embodiment, the case of using as a framework material of an agricultural house has been described. However, the present invention is not limited thereto, and can be applied to octagonal pipes for various uses.

１ ダイス
２ （スエージ加工する対象の）八角パイプ
２’（スエージ加工された）先細り八角パイプ
２ａ （八角パイプの）先細り部（縮径部）
２ａ１ （先細り部の）平行縮径部
２ａ２ （先細り部プの）テーパ状縮径部
２ｂ （八角パイプの縮径されていない）通常八角パイプ断面部
３ （ダイス出口側の最終絞り位置の）異形八角内面
３ａ （ダイス内面の）突出部
３ｂ （ダイス内面の）突出部
３ｃ （ダイス内面の）凹部
５ クランプ
Ｓ１ （ダイスの）導入内面
Ｓ２ （ダイスの）テーパ異形筒状内面
１０ 農業用ハウス骨組み
１１ 水平パイプ
１２ アーチ状パイプ 1 Die 2 Octagonal pipe 2 '(to be swaged) Tapered octagonal pipe 2a (to be swaged) Tapered part (reduced diameter part) of octagonal pipe
2a 1 Parallel reduced diameter portion 2a 2 (in the tapered portion) Tapered reduced diameter portion 2b (in the tapered portion) Normal octagonal pipe cross section 3 (in which the octagon pipe is not reduced in diameter) ) Deformed octagonal inner surface 3a Protruding portion 3b (inside of die inner surface) Protruding portion 3c (inside of die inner surface) Recessed portion 5 Clamp S 1 (inside of die) introduction inner surface S 2 (in dice) tapered modified cylindrical inner surface 10 Agriculture House frame 11 Horizontal pipe 12 Arch pipe

Claims (3)

金属製の八角パイプをスエージ加工する八角パイプのスエージ加工方法であって、
入口側において各辺が平坦な八角断面で、出口側において小径の八角形の８つの各辺の中央部に、入口側から出口側に向かって漸次突出量が増す態様でダイス中心側に突出する突出部を有するテーパ異形筒状内面のダイスに相対的に八角パイプを押し込んで、八角形の８つの各辺のそれぞれ中央部が内側に凹んだ異形八角断面形状に縮径加工することを特徴とする八角パイプのスエージ加工方法。 A swaging method for octagonal pipes, which swages metal octagonal pipes,
Each side has a flat octagonal cross section on the inlet side, and protrudes toward the center of the die in such a manner that the amount of protrusion gradually increases from the inlet side to the outlet side at the center of each of the eight sides of the small-diameter octagon on the outlet side. The octagonal pipe is relatively pushed into a die of a tapered deformed cylindrical inner surface having a protruding portion, and the diameter is reduced to a deformed octagonal cross-sectional shape in which each central portion of each of the eight sides of the octagon is recessed. How to swage octagon pipes. 前記テーパ異形筒状内面における８つの辺のうちの直角二方向の４つの辺の前記突出部の突出高さを他の４つの辺の前記突出部の突出高さより高くしたダイスに相対的に八角パイプを押し込んで、縮径加工することを特徴とする請求項１記載の八角パイプのスエージ加工方法。   Of the eight sides of the tapered deformed cylindrical inner surface, octagonal relative to a die in which the projecting height of the projecting portions of four sides in two perpendicular directions is higher than the projecting height of the projecting portions of the other four sides. 2. A method for swaging an octagonal pipe according to claim 1, wherein the pipe is pressed to reduce the diameter. 請求項１又は２のスエージ加工法により製造された八角パイプであって、長い八角パイプの先端部がスエージ加工されて、先端部のみが八角形の８つの各辺のそれぞれ中央部に内側に凹んだ異形八角断面形状であることを特徴とする八角パイプ。   An octagonal pipe manufactured by the swage processing method according to claim 1 or 2, wherein a tip portion of a long octagonal pipe is swaged, and only the tip portion is recessed inward in the center of each of the eight sides of the octagon. An octagonal pipe characterized by an irregular octagonal cross section.
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