JP2009072804A - Method of bending metallic pipe - Google Patents

Method of bending metallic pipe Download PDF

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Publication number
JP2009072804A
JP2009072804A JP2007242416A JP2007242416A JP2009072804A JP 2009072804 A JP2009072804 A JP 2009072804A JP 2007242416 A JP2007242416 A JP 2007242416A JP 2007242416 A JP2007242416 A JP 2007242416A JP 2009072804 A JP2009072804 A JP 2009072804A
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Prior art keywords
pipe
bending
granular material
hollow portion
granulated sugar
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Katsuaki Iida
勝亮 飯田
Takayuki Urabe
貴之 占部
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Fujifilm Corp
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Fujifilm Corp
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Priority to JP2007242416A priority Critical patent/JP2009072804A/en
Priority to US12/210,374 priority patent/US20090071222A1/en
Publication of JP2009072804A publication Critical patent/JP2009072804A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/15—Bending tubes using mandrels or the like using filling material of indefinite shape, e.g. sand, plastic material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of bending a metallic pipe which is very simple and yet allows the pipe to be bent without deforming the cross-sectional shape of the pipe. <P>SOLUTION: One opening of the pipe is stopped with a cap and granulated sugar is poured from the other opening. When the granulated sugar is packed into the hollow part of the pipe, the other opening is also stopped with a cap. The pipe is wound around along the outer circumferential surface of a columnar member and the pipe is bent like a coil. Because the granulated sugar is packed to the moderate degree of clogging, the pipe can be bent finely without deforming the cross-sectional shape of the pipe. After removing the caps from both openings of the pipe, a hose is connected to one opening, warm water is injected into the hollow part of the pipe. When the hose is changed into the other hose after the lapse of a prescribed time and compressed air is fed, the warm water in which the granulated sugar is dissolved and the remaining granulated sugar are pushed out from the other opening. The injection of the warm water and injection of the compressed air are twice repeated and the hollow part is dried by the last injection of the compressed air. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、金属製パイプの曲げ加工方法に関し、更に詳しくは金属製パイプの円筒を潰さずに曲げる金属製パイプの曲げ加工方法に関するものである。   The present invention relates to a method for bending a metal pipe, and more particularly, to a method for bending a metal pipe that bends without crushing a cylinder of the metal pipe.

金属製の中空パイプを曲げると、一般に曲げた部分の外側は偏平状に変形するとともに内側には皺が生じる。このような曲げ加工におけるパイプの断面形状の変形を防止する方法として、従来からパイプの内部に砂を封入してからパイプを加熱して曲げる方法やパイプの内部に窒素ガス等の圧力媒体を封入してからパイプを加熱して曲げる方法が知られている（例えば特許文献１）。
特開昭５８−９７２３号公報 When a metal hollow pipe is bent, the outside of the bent portion is generally deformed into a flat shape and a wrinkle is formed on the inside. As a method of preventing deformation of the cross-sectional shape of the pipe in such a bending process, conventionally, sand is enclosed in the pipe and then the pipe is heated and bent, or a pressure medium such as nitrogen gas is enclosed in the pipe. Then, a method of bending the pipe by heating is known (for example, Patent Document 1).
JP 58-9723 A

上述したパイプの内部に砂を封入してから曲げる方法では、曲げ加工終了後に行なわれる砂の排出作業においてパイプ内に砂が残留しやすく、完全に砂を排出するには多大な手間がかかるという問題点がある。この問題点は、太さが数ミリ以下の細いパイプの場合には、特に顕著である。   In the method of bending after the sand is enclosed inside the pipe as described above, the sand tends to remain in the pipe in the sand discharging operation performed after the bending process is completed, and it takes a lot of trouble to completely discharge the sand. There is a problem. This problem is particularly remarkable in the case of a thin pipe having a thickness of several millimeters or less.

上記特許文献１記載の窒素ガス等の圧力媒体を封入してからパイプを曲げる方法では、パイプの加熱時や曲げ加工時にパイプ内の圧力が著しく変化することが予想されるにも関わらず、この点についての対策は何ら記載されていない。パイプ内圧の制御は困難であるため、パイプの断面形状が一定しないばかりか、パイプの破裂等の危険も伴い、採用することはできない。   In the method of bending a pipe after enclosing a pressure medium such as nitrogen gas described in Patent Document 1, the pressure in the pipe is expected to change significantly during heating or bending of the pipe. No countermeasures are described for the points. Since it is difficult to control the internal pressure of the pipe, it cannot be employed because the pipe cross-sectional shape is not constant and there is a risk of rupture of the pipe.

本発明は、上記のような問題点を解決するためになされたもので、きわめて簡単な方法でありながらパイプの断面形状を変形させることなくパイプを曲げることができる金属製パイプの曲げ加工方法を提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and a metal pipe bending method that can bend a pipe without deforming the cross-sectional shape of the pipe while being a very simple method. The purpose is to provide.

本発明の金属製パイプの曲げ加工方法は、金属製のパイプの中空部に溶解性の粒状物を詰める詰め工程と、前記パイプを曲げる曲げ工程と、前記粒状物を溶解しながら前記パイプの中空部から粒状物と粒状物が溶解された液状物とを排出する排出工程とからなることを特徴とする。   The metal pipe bending method of the present invention includes a filling step of filling a hollow portion of a metal pipe with a soluble granular material, a bending step of bending the pipe, and a hollow of the pipe while dissolving the granular material. And a discharge step of discharging the granular material and the liquid material in which the granular material is dissolved from the portion.

前記詰め工程の前に、前記パイプの片方の口を塞ぐ第１の口塞ぎ工程を設けることを特徴とする。また、前記詰め工程の後に、前記パイプのもう片方の口を塞ぐ第２の口塞ぎ工程を設けることを特徴とする。   Before the stuffing step, a first clogging step for closing one of the mouths of the pipe is provided. In addition, a second clogging step for clogging the other mouth of the pipe is provided after the stuffing step.

少なくとも前記曲げ工程の前に、前記パイプの両方の口を塞ぐ口塞ぎ工程を設けることを特徴とする。また、前記曲げ工程の後に、前記パイプの両方の口を開放する口開放工程を設けることを特徴とする。また、前記排出工程における粒状物の溶解は、前記粒状物を溶解する溶解用液を前記パイプの中空部に注入することにより行なうことを特徴とする。   At least before the bending step, a clogging step for closing both the mouths of the pipe is provided. Moreover, after the said bending process, the opening | release process of opening both the opening | mouths of the said pipe is provided, It is characterized by the above-mentioned. Further, the dissolution of the particulate matter in the discharging step is performed by injecting a dissolving solution for dissolving the particulate matter into the hollow portion of the pipe.

前記排出工程は、前記粒状物を溶解する溶解用液をパイプの中空部に注入してから圧縮空気をパイプの中空部に送り込むことにより、前記粒状物と粒状物が溶解された液状物とをパイプの中空部から押し出すことによって行なわれることを特徴とする。   In the discharging step, a liquid for dissolving the particulate matter is dissolved in the hollow portion of the pipe after injecting a dissolving solution for dissolving the particulate matter into the hollow portion of the pipe. It is performed by extruding from the hollow part of a pipe.

前記溶解用液の注入と圧縮空気の注入とは、交互に複数回繰り返されることを特徴とする。また、前記圧縮空気の最後の注入によって、前記粒状物と液状物との押し出しと同時に中空部の乾燥も行なわれることを特徴とする。また、前記粒状物はグラニュー糖または塩であるとともに、前記溶解用液は温水又は水であることを特徴とする。   The dissolution liquid injection and the compressed air injection are alternately repeated a plurality of times. In addition, the hollow portion may be dried simultaneously with the extrusion of the granular material and the liquid material by the final injection of the compressed air. Further, the granular material is granulated sugar or salt, and the dissolving solution is warm water or water.

前記排出工程における粒状物の溶解は、前記粒状物を熱溶解することにより行なうことを特徴とする。また、前記排出工程は、前記パイプを加熱してから圧縮空気をパイプの中空部に送り込むことにより、前記粒状物と粒状物が溶解された液状物とをパイプの中空部から押し出すことによって行なわれることを特徴とする。   The dissolution of the particulate matter in the discharging step is performed by thermally dissolving the particulate matter. The discharging step is performed by extruding the granular material and the liquid material in which the granular material is dissolved from the hollow portion of the pipe by heating the pipe and then sending compressed air into the hollow portion of the pipe. It is characterized by that.

本発明の金属製パイプの曲げ加工方法によれば、金属製のパイプの中空部に溶解性の粒状物を詰めてからパイプを曲げ、この後、粒状物を溶解しながら排出するので、きわめて簡単な方法でありながらパイプの断面形状を変形させることなくパイプを曲げることができる。   According to the bending method of the metal pipe of the present invention, the pipe is bent after filling the hollow portion of the metal pipe with the soluble particulate matter, and thereafter, the particulate matter is discharged while being dissolved. In this way, the pipe can be bent without changing the cross-sectional shape of the pipe.

パイプに粒状物を詰める詰め工程の前に、パイプの片方の口を塞ぐ第１の口塞ぎ工程を設けるから、もう片方の口から粒状物がこぼれ出ることを防止できる。また、詰め工程の後に、パイプのもう片方の口を塞ぐ第２の口塞ぎ工程を設けるから、両方の口から粒状物がこぼれ出ることを防止できる。   Since the first clogging step for closing one mouth of the pipe is provided before the filling step for filling the pipe with the particulate matter, it is possible to prevent the particulate matter from spilling out from the other mouth. Moreover, since the 2nd clogging process which plugs the other opening | mouth of a pipe is provided after a filling process, it can prevent that a granular material spills out from both opening | mouths.

少なくとも曲げ工程の前に、パイプの両方の口を塞ぐ口塞ぎ工程を設けるから、曲げ工程にてパイプの口から粒状物がこぼれ出ることを確実に防止できる。また、曲げ工程が終了した後、パイプの両方の口を開放するので、粒状物の排出を支障なくできる。また、粒状物の溶解は、溶解用液をパイプの中空部に注入することにより行なうから、粒状物を液状にして簡単に排出できる。   At least before the bending step, a clogging step for closing both the mouths of the pipe is provided, so that it is possible to reliably prevent the particulate matter from spilling out from the mouth of the pipe in the bending step. Moreover, since both the opening | mouths of a pipe are open | released after a bending process is complete | finished, discharge | emission of a granular material can be performed without trouble. Moreover, since the granular material is dissolved by injecting the dissolving liquid into the hollow portion of the pipe, the granular material can be easily discharged in a liquid state.

溶解用液をパイプの中空部に注入してから圧縮空気をパイプの中空部に送り込むことにより粒状物と粒状物が溶解された液状物とをパイプの中空部から押し出すから、パイプの中空部から粒状物と粒状物が溶解された液状物とを速やかに排出することができる。溶解用液注入と圧縮空気注入とを交互に複数回繰り返すことにより、短時間で完全に粒状物と液状物とを排出することができる。   By injecting the dissolving liquid into the hollow part of the pipe and then sending compressed air into the hollow part of the pipe, the granular material and the liquid material in which the granular material is dissolved are pushed out from the hollow part of the pipe. The granular material and the liquid material in which the granular material is dissolved can be quickly discharged. By repeating the dissolving liquid injection and the compressed air injection alternately a plurality of times, the particulate matter and the liquid matter can be completely discharged in a short time.

圧縮空気の最後の注入によって中空部の乾燥も行なうから、中空部を効率よく乾燥させることができる。粒状物は、グラニュー糖または塩であるとともに溶解用液は温水又は水であるから、容易に入手できるとともに取り扱いがきわめて簡単かつ安全である。また、粒状物の溶解は、粒状物を熱溶解することにより行なうから、溶解用液の注入作業等が不要となり、粒状物の排出工程をより簡素化できる。また、パイプを加熱してから圧縮空気をパイプの中空部に送り込むことにより粒状物と粒状物が溶解された液状物とをパイプの中空部から押し出すから、効率よく粒状物と液状物を排出することができる。   Since the hollow portion is also dried by the final injection of compressed air, the hollow portion can be efficiently dried. Since the granular material is granulated sugar or salt and the solution for dissolution is warm water or water, it can be easily obtained and is very easy and safe to handle. In addition, since the granular material is dissolved by thermally dissolving the granular material, an operation of injecting the dissolving liquid or the like becomes unnecessary, and the discharge process of the granular material can be further simplified. Also, since the pipe is heated and then compressed air is fed into the hollow portion of the pipe to extrude the granular material and the liquid material in which the granular material is dissolved from the hollow portion of the pipe, the granular material and the liquid material are efficiently discharged. be able to.

本発明の曲げ加工方法を適用する金属製パイプであるパイプ１０を示す図１において、パイプ１０は、内径ｄ１が２ｍｍ〜３ｍｍ程度、外径ｄ２が３ｍｍ〜５ｍｍ程度の細長い円筒状をした銅製のパイプである。また、パイプ１０の両端部の内壁には、後述するキャップをねじ込むためのねじ１０ａがそれぞれ切ってある。以下、本発明の曲げ加工方法について図２に示すフローチャートに従って説明する。   In FIG. 1 showing a pipe 10 which is a metal pipe to which the bending method of the present invention is applied, the pipe 10 is made of copper having an elongated cylindrical shape having an inner diameter d1 of about 2 mm to 3 mm and an outer diameter d2 of about 3 mm to 5 mm. It is a pipe. Moreover, the screw 10a for screwing in the cap mentioned later is cut in the inner wall of the both ends of the pipe 10, respectively. Hereinafter, the bending method of the present invention will be described with reference to the flowchart shown in FIG.

パイプ１０を本実施形態ではコイル状に曲げるが、そのまま曲げると、パイプ１０が潰れてパイプ１０の中空部１０ｂが狭くなる。このため、パイプ１０の中空部１０ｂに粒状物としてのグラニュー糖１１を詰める。   In this embodiment, the pipe 10 is bent into a coil shape. However, if the pipe 10 is bent as it is, the pipe 10 is crushed and the hollow portion 10b of the pipe 10 is narrowed. For this reason, the hollow sugar 10b of the pipe 10 is filled with granulated sugar 11 as a granular material.

パイプ１０の中空部１０ｂにグラニュー糖１１を詰めるには、まず、パイプ１０の一方の口１０ｃにキャップ１４をねじ込み、口１０ｃを塞ぐ（ｓｔ１）。続いて、グラニュー糖１１を他方の口１０ｄに注ぎ、口１０ｄからグラニュー糖１１をパイプ１０の中空部１０ｂに入れる。このとき、口１０ｃが塞がれていて空気の逃げ場が無いようであるが、グラニュー糖１１は湿気を吸いにくくサラサラとしており、粒子が非常に細かいので、パイプ１０の中空部１０ｂに難なく詰め込むことができる（ｓｔ２）。この詰め加減は、後述するパイプ１０の曲げ工程に支障が無いように、あまり詰め過ぎず、グラニュー糖１１の各粒がある程度自由に動ける程度とする。   In order to pack the granulated sugar 11 in the hollow portion 10b of the pipe 10, first, the cap 14 is screwed into one of the openings 10c of the pipe 10 to close the opening 10c (st1). Subsequently, the granulated sugar 11 is poured into the other mouth 10d, and the granulated sugar 11 is put into the hollow portion 10b of the pipe 10 from the mouth 10d. At this time, it seems that the mouth 10c is blocked and there is no escape place of air, but the granulated sugar 11 is hard to absorb moisture and is smooth and the particles are very fine so that it can be easily packed into the hollow portion 10b of the pipe 10. (St2). This adjustment is made so that each granule sugar 11 can move freely to some extent without being overfilled so as not to hinder the bending process of the pipe 10 described later.

パイプ１０の中空部１０ｂにグラニュー糖１１を詰め終わったら、図３に示すように、口１０ｄにキャップ１４をねじ込んで口１０ｄをしっかりと塞ぐ（ｓｔ３）。これにより、後述するパイプ１０の曲げ工程時に、グラニュー糖１１が口１０ｃ，１０ｄから外にこぼれ出ることが防止される。   When the granulated sugar 11 is filled in the hollow portion 10b of the pipe 10, as shown in FIG. 3, the cap 14 is screwed into the mouth 10d to firmly close the mouth 10d (st3). This prevents the granulated sugar 11 from spilling out of the mouths 10c and 10d during the bending process of the pipe 10 described later.

次に、図４に示すように、パイプ１０の曲げ工程では、剛性を有する金属製又はセラミックス製の円柱状部材１５の外周面に沿ってパイプ１０を巻き付けてゆき、パイプ１０をコイル状に曲げる（ｓｔ４）。このとき、パイプ１０の中空部１０ｂにグラニュー糖１１が適度な詰め加減で入っているから、中空部１０ｂが潰れることなく（パイプ１０の断面形状が変形することなく）綺麗に曲げられる。なお、この曲げ工程時に、グラニュー糖１１が溶けない程度の温度にパイプ１０を温めると、パイプ１０をより容易に曲げることができる。   Next, as shown in FIG. 4, in the bending process of the pipe 10, the pipe 10 is wound around the outer peripheral surface of the rigid cylindrical member 15 made of metal or ceramics, and the pipe 10 is bent into a coil shape. (St4). At this time, since the granulated sugar 11 is appropriately packed in the hollow portion 10b of the pipe 10, the hollow portion 10b is bent beautifully without being crushed (without deforming the cross-sectional shape of the pipe 10). In addition, if the pipe 10 is warmed to a temperature at which the granulated sugar 11 does not melt during the bending process, the pipe 10 can be bent more easily.

パイプ１０の曲げ工程が終了したら、口１０ｃ，１０ｄからキャップ１４を取り外し、口１０ｃ，１０ｄを開放する（ｓｔ５）。次に、図５に示すように、パイプ１０の一方の口１０ｃにホース１６を接続して、グラニュー糖１１の溶解用液としての例えば４０℃程度の温水１７をパイプ１０の中空部１０ｂに注入する（ｓｔ６）。   When the bending process of the pipe 10 is completed, the cap 14 is removed from the ports 10c and 10d, and the ports 10c and 10d are opened (st5). Next, as shown in FIG. 5, a hose 16 is connected to one port 10 c of the pipe 10, and hot water 17 of about 40 ° C., for example, as a dissolving liquid for the granulated sugar 11 is injected into the hollow portion 10 b of the pipe 10. (St6).

グラニュー糖１１は、温水１７に溶けやすいが、パイプ１０に詰められている全てのグラニュー糖１１がすぐに溶ける訳ではない。温水１７を口１０ｃ側からパイプ１０の中空部１０ｂに注入し始めると、口１０ｃに近いグラニュー糖１１から徐々に溶ける一方、パイプ１０の内周面とグラニュー糖１１との隙間に温水１７が進入し、パイプ１０の内周面に接しているグラニュー糖１１が溶け始める。これにより、未だ溶けていないグラニュー糖１１もパイプ１０の内周面との摩擦抵抗が減少し、温水１７の水圧で他方の口１０ｄから押し出される。   Although the granulated sugar 11 is easily dissolved in the hot water 17, not all the granulated sugar 11 packed in the pipe 10 is dissolved immediately. When hot water 17 starts to be injected into the hollow portion 10b of the pipe 10 from the mouth 10c side, it gradually melts from the granulated sugar 11 near the mouth 10c, while the hot water 17 enters the gap between the inner peripheral surface of the pipe 10 and the granulated sugar 11. Then, the granulated sugar 11 in contact with the inner peripheral surface of the pipe 10 starts to melt. As a result, the granulated sugar 11 not yet melted is also reduced in frictional resistance with the inner peripheral surface of the pipe 10 and is pushed out from the other port 10d by the water pressure of the hot water 17.

温水１７を所定時間（例えば５分間）パイプ１０に注入した後、温水１７の注入を止め、パイプ１０の口１０ｃからホース１６を取り外す。続いて、図６に示すように、パイプ１０の口１０ｃに別のホース１８を接続して圧縮空気１９をパイプ１０の中空部１０ｂへ送り込む（ｓｔ７）。これにより、中空部１０ｂに残っていたグラニュー糖１１やグラニュー糖１１が溶けた温水１７が中空部１０ｂから押し出される。   After injecting the hot water 17 into the pipe 10 for a predetermined time (for example, 5 minutes), the injection of the hot water 17 is stopped and the hose 16 is removed from the opening 10c of the pipe 10. Subsequently, as shown in FIG. 6, another hose 18 is connected to the opening 10c of the pipe 10 and the compressed air 19 is sent into the hollow portion 10b of the pipe 10 (st7). As a result, the granulated sugar 11 remaining in the hollow portion 10b and the hot water 17 in which the granulated sugar 11 is dissolved are pushed out from the hollow portion 10b.

圧縮空気１７の注入を例えば３分間継続した後、ホース１８をパイプ１０の口１０ｃから取り外し、再びパイプ１０の口１０ｃにホース１６を接続して温水１７を中空部１０ｂに注入する（ｓｔ６）。所定時間が経過したら温水１７の注入を止め、ホース１６の代わりにホース１８を接続して圧縮空気１９をパイプ１０の中空部１０ｂへ送り込む（ｓｔ７）。これにより、中空部１０ｂに残っていたグラニュー糖１１やグラニュー糖１１が溶けた温水１７が完全に中空部１０ｂから排出される（ｓｔ８）。   After injecting the compressed air 17 for 3 minutes, for example, the hose 18 is removed from the port 10c of the pipe 10, the hose 16 is connected to the port 10c of the pipe 10 again, and hot water 17 is injected into the hollow portion 10b (st6). When the predetermined time has elapsed, the injection of the hot water 17 is stopped, the hose 18 is connected instead of the hose 16, and the compressed air 19 is sent into the hollow portion 10b of the pipe 10 (st7). As a result, the granulated sugar 11 remaining in the hollow portion 10b and the warm water 17 in which the granulated sugar 11 is dissolved are completely discharged from the hollow portion 10b (st8).

また、この圧縮空気１９の最後の注入により、中空部１０ｂが乾燥される（ｓｔ９）。以上でパイプ１０の曲げ加工の全工程が完了する。   Further, the hollow portion 10b is dried by the final injection of the compressed air 19 (st9). This completes the entire process of bending the pipe 10.

以上説明した実施形態では、金属製のパイプとして銅製パイプを挙げたが、本発明はこれに限定されることなく、例えばアルミニウム製パイプや鉄製パイプ等でもよい。また、本発明は比較的細いパイプに特に有効であるから、上記実施形態ではパイプの内径を２ｍｍ〜３ｍｍ程度、外径を３ｍｍ〜５ｍｍ程度としたが、本発明はこれらの数値に限定されないのは勿論である。   In the embodiment described above, the copper pipe is exemplified as the metal pipe, but the present invention is not limited to this, and may be, for example, an aluminum pipe or an iron pipe. Further, since the present invention is particularly effective for relatively thin pipes, in the above embodiment, the inner diameter of the pipe is set to about 2 mm to 3 mm and the outer diameter is set to about 3 mm to 5 mm. However, the present invention is not limited to these numerical values. Of course.

上記実施形態では、パイプをコイル状に曲げ加工したが、本発明はこれに限定されることなく、例えばパイプをＬ字状等に曲げ加工する場合にも適用できる。   In the above embodiment, the pipe is bent into a coil shape, but the present invention is not limited to this, and can be applied to a case where the pipe is bent into an L shape or the like, for example.

上記実施形態では、グラニュー糖を排出するために４０℃程度の温水を用いたが、本発明はこれに限定されることなく、グラニュー糖が溶けやすい温度の水であればよく、例えば夏場であれば常温の水（水道水や地下水等の工業用水）でもよい。   In the above embodiment, warm water of about 40 ° C. is used to discharge granulated sugar. However, the present invention is not limited to this, and water having a temperature at which granulated sugar can be easily dissolved may be used. For example, room temperature water (industrial water such as tap water or groundwater) may be used.

上記実施形態では、溶解性の粒状物としてグラニュー糖を挙げたが、本発明はこれに限定されることなく、例えば塩でもよい。また、これら水溶性の粒状物に限らず、油で溶解する粒状物，熱で溶解する粒状物，化学的に溶解する粒状物等を使用することができる。なお、熱で溶解する粒状物としては、例えば熱可塑性ビーズなどが使用できる。また、粒状物を熱で溶解した後、上記実施形態と同様に、圧縮空気をパイプ中に送り込み、粒状物の残りと溶解した液状物とを押し出すことが好ましい。これは油で溶解する粒状物や化学的に溶解する粒状物等でも同様である。   In the said embodiment, although granulated sugar was mentioned as a soluble granular material, this invention is not limited to this, For example, a salt may be sufficient. Moreover, not only these water-soluble granular materials but granular materials that dissolve with oil, granular materials that dissolve with heat, granular materials that dissolve chemically, and the like can be used. In addition, as a granular material melt | dissolved with a heat | fever, a thermoplastic bead etc. can be used, for example. Moreover, after melt | dissolving a granular material with heat, it is preferable to send compressed air into a pipe like the said embodiment, and to extrude the remainder of a granular material and the melted liquid material. The same applies to granular materials that dissolve with oil, granular materials that dissolve chemically, and the like.

上記実施形態では、パイプの口を塞ぐためにねじ式のキャップを用いたが、本発明はこれに限定されることなく、例えば嵌め込み式のキャップでもよく、また、パイプの口を治具で潰してもよい。パイプの口を潰した場合には、後でグラニュー糖を排出する前に、潰した部分を切り取るようにする。   In the above embodiment, a screw-type cap is used to close the mouth of the pipe. However, the present invention is not limited to this. For example, a fitting-type cap may be used, and the pipe mouth may be crushed with a jig. Also good. When the mouth of the pipe is crushed, the crushed portion is cut off before the granulated sugar is discharged later.

上記実施形態では、パイプの中空部からの残留温水の除去及び中空部の乾燥を行なうために圧縮空気をパイプの中空部に送り込むようにしたが、本発明はこれに限定されることなく、例えば温水でグラニュー糖を排出した後、パイプを乾燥室に入れて温めたり、自然乾燥するようにしてもよい。   In the above embodiment, the compressed air is fed into the hollow part of the pipe in order to remove the residual warm water from the hollow part of the pipe and dry the hollow part, but the present invention is not limited to this, for example, After draining the granulated sugar with warm water, the pipe may be put in a drying chamber to warm it or air dry.

上記実施形態では、温水の注入と圧縮空気の注入とを２度繰り返したが、本発明はこれに限定されることなく、例えば３度でも５度でもよく、また全てのグラニュー糖及び温水が排出できれば１度でもよい。また、上記実施形態では、温水の注入時間を５分間、圧縮空気の注入時間を３分間としたが、本発明はこれらの数値に限定されないのは勿論である。   In the above embodiment, the injection of warm water and the injection of compressed air are repeated twice. However, the present invention is not limited to this, and may be, for example, 3 degrees or 5 degrees, and all granulated sugar and hot water are discharged. If possible, it may be once. In the above embodiment, the hot water injection time is 5 minutes and the compressed air injection time is 3 minutes, but the present invention is not limited to these values.

本発明の曲げ加工方法を適用するパイプにグラニュー糖を詰める様子を示す断面図である。It is sectional drawing which shows a mode that granulated sugar is packed into the pipe to which the bending method of this invention is applied. 曲げ加工方法の主なシーケンスを示すフローチャートである。It is a flowchart which shows the main sequences of the bending method. パイプの両方の口をキャップで塞いだ状態を示す説明図である。It is explanatory drawing which shows the state which plugged up both the mouths of the pipe with the cap. パイプを曲げる様子を示す説明図である。It is explanatory drawing which shows a mode that a pipe is bent. パイプからグラニュー糖を排出する様子を示す説明図である。It is explanatory drawing which shows a mode that granulated sugar is discharged | emitted from a pipe. パイプに圧縮空気を送り込む様子を示す説明図である。It is explanatory drawing which shows a mode that compressed air is sent into a pipe.

符号の説明Explanation of symbols

１０ パイプ
１１ グラニュー糖
１０ｂ 中空部
１４ キャップ
１７ 温水
１９ 圧縮空気 DESCRIPTION OF SYMBOLS 10 Pipe 11 Granulated sugar 10b Hollow part 14 Cap 17 Hot water 19 Compressed air

Claims (12)

金属製のパイプの中空部に溶解性の粒状物を詰める詰め工程と、
前記パイプを曲げる曲げ工程と、
前記粒状物を溶解しながら前記パイプの中空部から粒状物と粒状物が溶解された液状物とを排出する排出工程と
からなることを特徴とする金属製パイプの曲げ加工方法。 A stuffing step of filling a hollow part of a metal pipe with a soluble granular material;
A bending step of bending the pipe;
A metal pipe bending method comprising: a discharging step of discharging the granular material and the liquid material in which the granular material is dissolved from the hollow portion of the pipe while dissolving the granular material. 前記詰め工程の前に、前記パイプの片方の口を塞ぐ第１の口塞ぎ工程を設けることを特徴とする請求項１記載の金属製パイプの曲げ加工方法。   The metal pipe bending method according to claim 1, wherein a first clogging step for closing one of the mouths of the pipe is provided before the filling step. 前記詰め工程の後に、前記パイプのもう片方の口を塞ぐ第２の口塞ぎ工程を設けることを特徴とする請求項２記載の金属製パイプの曲げ加工方法。   The method for bending a metal pipe according to claim 2, wherein a second clogging step for clogging the other mouth of the pipe is provided after the stuffing step. 少なくとも前記曲げ工程の前に、前記パイプの両方の口を塞ぐ口塞ぎ工程を設けることを特徴とする請求項１記載の金属製パイプの曲げ加工方法。   The metal pipe bending method according to claim 1, wherein a clogging step for closing both the mouths of the pipe is provided at least before the bending step. 前記曲げ工程の後に、前記パイプの両方の口を開放する口開放工程を設けることを特徴とする請求項２ないし４いずれか記載の金属製パイプの曲げ加工方法。   The method for bending a metal pipe according to any one of claims 2 to 4, further comprising a mouth opening step for opening both ends of the pipe after the bending step. 前記排出工程における粒状物の溶解は、前記粒状物を溶解する溶解用液を前記パイプの中空部に注入することにより行なうことを特徴とする請求項１ないし５いずれか記載の金属製パイプの曲げ加工方法。   The metal pipe bending according to any one of claims 1 to 5, wherein the dissolution of the particulate matter in the discharging step is performed by injecting a dissolving solution for dissolving the particulate matter into the hollow portion of the pipe. Processing method. 前記排出工程は、前記粒状物を溶解する溶解用液をパイプの中空部に注入してから圧縮空気をパイプの中空部に送り込むことにより、前記粒状物と粒状物が溶解された液状物とをパイプの中空部から押し出すことによって行なわれることを特徴とする請求項１ないし６いずれか記載の金属製パイプの曲げ加工方法。   In the discharging step, a liquid for dissolving the particulate matter is dissolved in the hollow portion of the pipe after injecting a dissolving solution for dissolving the particulate matter into the hollow portion of the pipe. The method for bending a metal pipe according to any one of claims 1 to 6, wherein the method is performed by extruding from a hollow portion of the pipe. 前記溶解用液の注入と圧縮空気の注入とは、交互に複数回繰り返されることを特徴とする請求項７記載の金属製パイプの曲げ加工方法。   8. The method for bending a metal pipe according to claim 7, wherein the injection of the dissolving liquid and the injection of compressed air are alternately repeated a plurality of times. 前記圧縮空気の最後の注入によって、前記粒状物と液状物との押し出しと同時に中空部の乾燥も行なわれることを特徴とする請求項７または８記載の金属製パイプの曲げ加工方法。   The metal pipe bending method according to claim 7 or 8, wherein the hollow portion is also dried simultaneously with the extrusion of the granular material and the liquid material by the final injection of the compressed air. 前記粒状物はグラニュー糖または塩であるとともに、前記溶解用液は温水又は水であることを特徴とする請求項１ないし９いずれか記載の金属製パイプの曲げ加工方法。   The method for bending a metal pipe according to any one of claims 1 to 9, wherein the granular material is granulated sugar or salt, and the dissolving liquid is warm water or water. 前記排出工程における粒状物の溶解は、前記粒状物を熱溶解することにより行なうことを特徴とする請求項１ないし５いずれか記載の金属製パイプの曲げ加工方法。   6. The method for bending a metal pipe according to claim 1, wherein the melting of the granular material in the discharging step is performed by thermally melting the granular material. 前記排出工程は、前記パイプを加熱してから圧縮空気をパイプの中空部に送り込むことにより、前記粒状物と粒状物が溶解された液状物とをパイプの中空部から押し出すことによって行なわれることを特徴とする請求項１１記載の金属製パイプの曲げ加工方法。   The discharging step is performed by extruding the granular material and the liquid material in which the granular material is dissolved from the hollow portion of the pipe by heating the pipe and then sending compressed air into the hollow portion of the pipe. The method for bending a metal pipe according to claim 11, wherein the metal pipe is bent.
JP2007242416A 2007-09-19 2007-09-19 Method of bending metallic pipe Pending JP2009072804A (en)

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