JP2012255511A - Corrugated tube and method for manufacturing the same - Google Patents

Corrugated tube and method for manufacturing the same Download PDF

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JP2012255511A
JP2012255511A JP2011129824A JP2011129824A JP2012255511A JP 2012255511 A JP2012255511 A JP 2012255511A JP 2011129824 A JP2011129824 A JP 2011129824A JP 2011129824 A JP2011129824 A JP 2011129824A JP 2012255511 A JP2012255511 A JP 2012255511A
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corrugated tube
bellows
corrugated
bellows height
height
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JP5885943B2 (en
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Masunari Mutsunoki
益成 六軒
Yoshihiro Sawahira
嘉浩 沢平
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Nitta Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a corrugated tube provided with a flexible part and a rigid part without deteriorating productivity.SOLUTION: A tube raw material is supplied from an extruder 21 to a corrugating unit 22 by a constant supply amount per unit time. The corrugated tube CT is molded at a constant speed in the corrugating unit 22. In the corrugated tube molding process in the corrugating unit 22, the flexible part, which has a first bellows height and has flexibility, and a rigid part, which has a second bellows height and has rigidity, are formed.

Description

本発明は、可撓性を備えた可撓部と剛性を備えた剛性部とを備えるコルゲートチューブおよびその製造方法に関する。   The present invention relates to a corrugated tube including a flexible portion having flexibility and a rigid portion having rigidity, and a manufacturing method thereof.

フィラーパイプやワイヤハーネスの保護カバー等として樹脂製のコルゲートチューブが用いられている。これらのチューブは、機器等の配置に合わせ配管する必要がある。配管アレンジメントには、直線部と湾曲部が存在するため、チューブには可撓性が必要な部分と剛性が必要な部分が存在する。このようなことから、管路軌道に沿ったプロテクタをチューブに被せる構成（特許文献１）や、コルゲートチューブにストレート部を設け、成形速度を調整してストレート部と蛇腹部の肉厚を調整する構成（特許文献２）が知られている。   A resin corrugated tube is used as a protective cover for filler pipes and wire harnesses. These tubes need to be piped in accordance with the arrangement of equipment and the like. Since the piping arrangement includes a straight portion and a curved portion, the tube includes a portion requiring flexibility and a portion requiring rigidity. For this reason, a structure (Patent Document 1) covering the protector along the pipe path is provided, or a straight part is provided on the corrugated tube, and the molding speed is adjusted to adjust the thickness of the straight part and the bellows part. A configuration (Patent Document 2) is known.

特開２００１−０９７０５４号公報JP 2001-097054 A 特開２００７−０４６７７２号公報JP 2007-046772 A

しかし、プロテクタでコルゲートチューブを覆う構成では、プロテクタが別途必要になるとともに、プロテクタ装着のため手間も増大する。また、コルゲートチューブの成形速度を調整して肉厚を調整する構成では、肉厚部で成形速度を遅くする必要があるため生産性に問題が発生する。   However, in the configuration in which the corrugated tube is covered with the protector, a protector is required separately, and the labor for mounting the protector increases. Moreover, in the structure which adjusts the shaping | molding speed | rate of a corrugated tube and adjusts thickness, since a shaping | molding speed needs to be slowed in a thick part, a problem generate | occur | produces.

本発明は、生産性を落とすことなく可撓部と剛性部とを備えたコルゲートチューブを得ることを課題としている。   This invention makes it a subject to obtain the corrugated tube provided with the flexible part and the rigid part, without reducing productivity.

本発明のコルゲートチューブは、連続する第１の蛇腹高さを有し可撓性を備える可撓部と、連続する第２の蛇腹高さを有し剛性を備える剛性部とを備え、第２の蛇腹高さが第１の蛇腹高さよりも低く、可撓部および剛性部の蛇腹の山の肉厚が実質的に等しいことを特徴としている。   The corrugated tube of the present invention includes a flexible part having a first continuous bellows height and flexibility, and a rigid part having a second continuous bellows height and rigidity. The height of the bellows is lower than the height of the first bellows, and the thickness of the bellows of the flexible portion and the rigid portion is substantially equal.

コルゲートチューブの取り付け効率を向上するには、剛性部の外径が可撓部の外径に等しいことが好ましい。例えば第２の蛇腹高さは、第１の蛇腹高さの８０％以下である。また、第２の蛇腹高さは、第１の蛇腹高さの７５％であることがより好ましい。   In order to improve the attachment efficiency of the corrugated tube, it is preferable that the outer diameter of the rigid portion is equal to the outer diameter of the flexible portion. For example, the second bellows height is 80% or less of the first bellows height. The second bellows height is more preferably 75% of the first bellows height.

本発明のコルゲートチューブ製造方法は、チューブ原料を単位時間当たり一定の供給量でコルゲートユニットに供給し、コルゲートユニットが一定の速度でコルゲートチューブを成形し、コルゲートユニットにおけるコルゲートチューブ成形過程において第１の蛇腹高さを有し可撓性を備える可撓部と、第２の蛇腹高さを有し剛性を備える剛性部とが形成されることを特徴としている。   In the corrugated tube manufacturing method of the present invention, the tube raw material is supplied to the corrugated unit at a constant supply amount per unit time, and the corrugated unit forms the corrugated tube at a constant speed. A flexible part having a bellows height and having flexibility, and a rigid part having a second bellows height and having rigidity are formed.

本発明によれば、生産性を落とすことなく可撓部と剛性部とを備えたコルゲートチューブを得ることができる。   According to the present invention, it is possible to obtain a corrugated tube having a flexible portion and a rigid portion without reducing productivity.

本実施形態のコルゲートチューブの側断面図である。It is a sectional side view of the corrugated tube of this embodiment. 本実施形態のコルゲートチューブを形成するためのコルゲート管製造装置の構成図である。It is a block diagram of the corrugated pipe manufacturing apparatus for forming the corrugated tube of this embodiment. 谷外径の大きさの違いによるキンク発生時の曲げ半径の変化と、谷外径の大きさの違いによる一定の曲げ半径における山内径部の軸応力の変化をシミュレートした結果を示すグラフである。This graph shows the results of simulating changes in the bending radius at the time of kinking due to the difference in the valley outer diameter, and changes in the axial stress at the inner diameter of the mountain at a constant bending radius due to the difference in the valley outer diameter. is there.

以下、本発明の実施の形態を、図面を参照して説明する。図１は、本発明の一実施形態であるコルゲートチューブの中心軸に沿った断面図であり、図にはコルゲートチューブの一部が示される。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view along the central axis of a corrugated tube according to an embodiment of the present invention, and a part of the corrugated tube is shown in the drawing.

本実施形態においてコルゲートチューブ１０は、相対的に可撓性に富む可撓部１１と、相対的に剛性に富む剛性部１２とから構成される。図１では、コルゲートチューブ１０の可撓部１１と剛性部１２の接続部周辺のみが示される。可撓部１１および剛性部１２は、ともにそれぞれ連続する蛇腹構造を有し、本実施形態では、両部位の山部の外径（山外径）Ｄは等しい。一方、可撓部１１および剛性部１２の谷部の外径（谷外径）φ１、φ２は、可撓部１１の谷外径φ１の方が剛性部１２の谷外径φ２よりも小さい（φ１＜φ２）。可撓部１１の湾曲に対し、剛性部１２が十分な剛性を発揮するには、剛性部１２の蛇腹高さｈ２＝（Ｄ−φ２）／２は、可撓部１１の蛇腹高さｈ１＝（Ｄ−φ１）／２の８０％以下であり、より好ましくは７５％以下、また更に好ましくは７５％である。また、高いキンク強度を維持するには、蛇腹高さｈ２をｈ１の１０％以上、より好ましくは３５％以上、更には６０％以上とすることが好ましい。   In the present embodiment, the corrugated tube 10 includes a flexible portion 11 that is relatively flexible and a rigid portion 12 that is relatively rich in rigidity. In FIG. 1, only the periphery of the connection portion between the flexible portion 11 and the rigid portion 12 of the corrugated tube 10 is shown. Each of the flexible portion 11 and the rigid portion 12 has a continuous bellows structure, and in this embodiment, the outer diameters (mountain outer diameters) D of the peak portions at both portions are equal. On the other hand, the outer diameters (valley outer diameters) φ1 and φ2 of the valley portions of the flexible portion 11 and the rigid portion 12 are smaller in the valley outer diameter φ1 of the flexible portion 11 than the valley outer diameter φ2 of the rigid portion 12 ( φ1 <φ2). In order for the rigid portion 12 to exhibit sufficient rigidity with respect to the bending of the flexible portion 11, the bellows height h2 = (D−φ2) / 2 of the rigid portion 12 is the bellows height h1 = of the flexible portion 11. It is 80% or less of (D-φ1) / 2, more preferably 75% or less, and still more preferably 75%. In order to maintain high kink strength, the bellows height h2 is preferably 10% or more of h1, more preferably 35% or more, and even more preferably 60% or more.

図２は、本実施形態のコルゲートチューブ１０を製造するためのコルゲート管製造装置２０の構成図である。   FIG. 2 is a configuration diagram of a corrugated tube manufacturing apparatus 20 for manufacturing the corrugated tube 10 of the present embodiment.

コルゲート管製造装置２０は、加熱して柔らかくなったチューブ原料を管状に成形して押出機２１からコルゲートユニット２２へと連続的に供給する。コルゲートユニット２２では、周知のように蛇腹形状を形成する一対の金型が複数連続して無限軌道状に搬送される。本実施形態のコルゲートユニット２２では、可撓部１１の蛇腹形状を成形する金型Ａと、剛性部１２の蛇腹形状を成形する金型Ｂが所定の順序で配列される。   The corrugated tube manufacturing apparatus 20 forms a tube material that has been heated and softened into a tubular shape, and continuously supplies the tube material from the extruder 21 to the corrugated unit 22. In the corrugated unit 22, as is well known, a plurality of pairs of molds forming a bellows shape are continuously conveyed in an endless track shape. In the corrugated unit 22 of the present embodiment, the mold A for molding the bellows shape of the flexible portion 11 and the mold B for molding the bellows shape of the rigid portion 12 are arranged in a predetermined order.

押出機２１から供給される管状のチューブ原料は、搬送される金型Ａ、Ｂ内に送り込まれ、各金型に設けられたバキューム機構（図示せず）により、金型Ａ、Ｂの内側面に密着される。これにより、可撓部１１、剛性部１２の蛇腹形状を備えたコルゲートチューブＣＴが賦形され、コルゲートユニット２２の下流側から送出される。   The tubular tube raw material supplied from the extruder 21 is fed into the molds A and B to be transported, and the inner surfaces of the molds A and B are provided by a vacuum mechanism (not shown) provided in each mold. It is closely attached to. Thereby, corrugated tube CT provided with the bellows shape of the flexible part 11 and the rigid part 12 is shaped, and is sent out from the downstream side of the corrugated unit 22.

本実施形態において、押出機２１からコルゲートユニット２２へ供給されるチューブ原料の単位時間当たりの供給量は一定とされ、コルゲートユニット２２における金型の搬送速度も一定に維持される。このとき可撓部１１、剛性部１２における蛇腹の山の肉厚は略同じ厚さとなる。   In this embodiment, the supply amount per unit time of the tube raw material supplied from the extruder 21 to the corrugated unit 22 is constant, and the conveyance speed of the mold in the corrugated unit 22 is also maintained constant. At this time, the thicknesses of the bellows peaks in the flexible portion 11 and the rigid portion 12 are substantially the same.

図３は、谷外径の大きさの違いによるキンク発生時の曲げ半径の変化と、谷外径の大きさの違いによる一定の曲げ半径における山内径部の軸応力の変化をシミュレートした結果を示すグラフである。   Fig. 3 shows the results of simulating changes in the bending radius when kinking occurs due to the difference in the valley outer diameter and changes in the axial stress at the inner diameter of the mountain at a constant bending radius due to the difference in the valley outer diameter. It is a graph which shows.

シミュレーションでは、蛇腹の山の肉厚（略０．３ｍｍ）、ピッチ（２．０９ｍｍ）、山外径（７．８ｍｍ）を一定とし、谷外径（蛇腹高さ）を５．３０ｍｍ（１．２５ｍｍ）、５．５３ｍｍ（１．１３５ｍｍ）、５．７５ｍｍ（１．０２５ｍｍ）、６．１９ｍｍ（０．８０５ｍｍ）としたときのキンク時曲げ半径（Ｐ１〜Ｐ４）をシミュレーションにより求めた。また、同谷外径を有するコルゲートチューブを１３．９ｍｍの半径で曲げたときの山内径部における軸方向応力（Ｑ１〜Ｑ４）を求めた。   In the simulation, the thickness of the bellows mountain (approximately 0.3 mm), the pitch (2.09 mm), the mountain outer diameter (7.8 mm) are constant, and the valley outer diameter (bellows height) is 5.30 mm (1. 25 mm), 5.53 mm (1.135 mm), 5.75 mm (1.025 mm), 6.19 mm (0.805 mm), and kink bending radii (P1 to P4) were obtained by simulation. Moreover, the axial direction stress (Q1-Q4) in the mountain inner diameter part when the corrugated tube which has the same valley outer diameter was bent by the radius of 13.9 mm was calculated | required.

図３に示されるように、谷外径が大きくなるにしたがってキンク時曲げ半径は増大する。すなわち、蛇腹高さが小さくなるにしたがってキンク曲げ半径が増大する。一方、Ｐ１では、キンク時曲げ半径が７．０ｍｍよりも小さく、山外径が７．８ｍｍであることからＰ１の蛇腹高さでは、キンクは発生しないことが分かる。   As shown in FIG. 3, the kink bending radius increases as the valley outer diameter increases. That is, the kink bending radius increases as the bellows height decreases. On the other hand, at P1, the kink bending radius is smaller than 7.0 mm and the mountain outer diameter is 7.8 mm, so that it can be seen that no kinking occurs at the bellows height of P1.

また、Ｐ４のキンク時曲げ半径は、１３．９ｍｍであり、各谷外径を有するコルゲートチューブをこの曲げ半径まで曲げたときの山内径部の軸方向応力（Ｑ１〜Ｑ４）は、谷外径が大きくなるほど大きくなる。すなわち、蛇腹高さが小さくなるほどコルゲートチューブの曲げ抵抗が大きくなることが分かる。   Moreover, the bending radius at the time of kinking of P4 is 13.9 mm, and the axial stress (Q1 to Q4) of the inner diameter portion of the mountain when the corrugated tube having each outer diameter of the valley is bent to this bending radius is the outer diameter of the valley. The larger the is, the larger it becomes. That is, it can be seen that the bending resistance of the corrugated tube increases as the bellows height decreases.

以上のように本実施形態によれば、蛇腹高さを調整することでコルゲートチューブに可撓部と剛性部を形成することができる。このときチューブ原料の供給量および製造速度を一定に維持しながらも剛性部における山の外径部の肉厚を可撓部と略同じに厚さに維持できるので、剛性部のキンク強度を高めることができる。   As described above, according to the present embodiment, the flexible portion and the rigid portion can be formed in the corrugated tube by adjusting the bellows height. At this time, the thickness of the outer diameter portion of the mountain in the rigid portion can be maintained substantially the same as that of the flexible portion while maintaining the supply amount and production speed of the tube raw material constant, thereby increasing the kink strength of the rigid portion. be able to.

また、本実施形態では上記効果を利用して可撓部と剛性部の外径を等しくすることができるので、コルゲートチューブを固定するためのファスナに同じ大きさのものを利用することができる。これにより、コルゲートチューブの取付け効率が向上される。例えば、コルゲートチューブの外径を一定に維持しながら剛性部をストレート部として形成する場合には、チューブ原料の供給量を増大させるか製造速度を低減しなければ、ストレート部における肉厚が薄くなりキンク強度が低下してしまうが、本実施形態ではこのような問題が発生することがない。   Moreover, in this embodiment, since the outer diameter of a flexible part and a rigid part can be made equal using the said effect, the thing of the same magnitude | size can be utilized for the fastener for fixing a corrugated tube. Thereby, the attachment efficiency of a corrugated tube is improved. For example, when the rigid part is formed as a straight part while keeping the outer diameter of the corrugated tube constant, the thickness of the straight part will be reduced unless the supply rate of the tube raw material is increased or the production rate is reduced. Although the kink strength is lowered, this problem does not occur in the present embodiment.

なお、コルゲートチューブの外径を一定とする必要がない場合には、剛性部の外径を可撓部よりも小さくするなど、その外径を異ならせることも可能である。   In addition, when it is not necessary to make the outer diameter of a corrugated tube constant, it is also possible to make the outer diameter different, for example, making the outer diameter of a rigid part smaller than a flexible part.

１０ コルゲートチューブ
１１ 可撓部
１２ 剛性部
２０ コルゲート管製造装置
２１ 押出機
２２ コルゲートユニット
ＣＴ コルゲートチューブ DESCRIPTION OF SYMBOLS 10 Corrugated tube 11 Flexible part 12 Rigid part 20 Corrugated pipe manufacturing apparatus 21 Extruder 22 Corrugated unit CT Corrugated tube

Claims (5)

連続する第１の蛇腹高さを有し、可撓性を備える可撓部と、
連続する第２の蛇腹高さを有し、剛性を備える剛性部とを備え、
前記第２の蛇腹高さが前記第１の蛇腹高さよりも低く、前記可撓部および前記剛性部の蛇腹の山の肉厚が実質的に等しい
ことを特徴とするコルゲートチューブ。 A flexible portion having a continuous first bellows height and having flexibility;
Having a continuous second bellows height, and having a rigid portion having rigidity;
The corrugated tube, wherein the second bellows height is lower than the first bellows height, and the wall thickness of the bellows of the flexible portion and the rigid portion is substantially equal. 前記剛性部の山外径が前記可撓部の山外径に等しいことを特徴とする請求項１に記載のコルゲートチューブ。   The corrugated tube according to claim 1, wherein a mountain outer diameter of the rigid portion is equal to a mountain outer diameter of the flexible portion. 前記第２の蛇腹高さが前記第１の蛇腹高さの８０％以下であることを特徴とする請求項１に記載のコルゲートチューブ。   The corrugated tube according to claim 1, wherein the second bellows height is 80% or less of the first bellows height. 前記第２の蛇腹高さが前記第１の蛇腹高さの７５％であることを特徴とする請求項１に記載のコルゲートチューブ。   The corrugated tube according to claim 1, wherein the second bellows height is 75% of the first bellows height. チューブ原料を単位時間当たり一定の供給量でコルゲートユニットに供給し、
前記コルゲートユニットが一定の速度で前記コルゲートチューブを成形し、
前記コルゲートユニットにおけるコルゲートチューブ成形過程において第１の蛇腹高さを有し可撓性を備える可撓部と、第２の蛇腹高さを有し剛性を備える剛性部とが形成される
ことを特徴とするコルゲートチューブ製造方法。
The tube material is supplied to the corrugated unit at a constant supply rate per unit time.
The corrugating unit molds the corrugated tube at a constant speed,
A flexible part having a first bellows height and flexibility and a rigid part having a second bellows height and rigidity are formed in the corrugated tube forming process in the corrugated unit. Corrugated tube manufacturing method.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9925934B2 (en) 2014-06-02 2018-03-27 Yazaki Corporation Corrugated tube and wire harness for slide door

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