JPH0643878B2 - Synthetic resin bellows tube - Google Patents
Synthetic resin bellows tubeInfo
- Publication number
- JPH0643878B2 JPH0643878B2 JP60057762A JP5776285A JPH0643878B2 JP H0643878 B2 JPH0643878 B2 JP H0643878B2 JP 60057762 A JP60057762 A JP 60057762A JP 5776285 A JP5776285 A JP 5776285A JP H0643878 B2 JPH0643878 B2 JP H0643878B2
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- bellows tube
- tube
- synthetic resin
- tube material
- 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
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- Rigid Pipes And Flexible Pipes (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，合成樹脂製の蛇腹管に関するもので，さらに
詳言すれば，より柔軟性のある合成樹脂製の蛇腹細管の
構造に関するものである。TECHNICAL FIELD The present invention relates to a synthetic resin bellows tube, and more specifically to a structure of a more flexible synthetic resin bellows tube. is there.
合成樹脂製の蛇腹管が種々の成形方法によって成形され
て数多くの分野で利用されているが，比較的径の小さい
蛇腹管を得るには，主にブロー成形によって成形してい
た。Synthetic resin bellows tubes are molded by various molding methods and used in many fields, but in order to obtain bellows tubes having a relatively small diameter, they were mainly molded by blow molding.
すなわち，蛇腹管に成形される直線円筒形状をした合成
樹脂製の細管素材を，延伸変形成形可能な温度に加熱し
た状態で，蛇腹管成形用のブロー金型に組付け，この金
型に組付けた細管素材内に圧力流体を圧入し，もって細
管素材を蛇腹管に成形していた。In other words, a straight-cylindrical synthetic resin thin tube material that is molded into a bellows tube is assembled in a blow mold for bellows tube molding while being heated to a temperature at which it can be stretch-deformed. A pressure fluid was pressed into the attached thin tube material to form the thin tube material into a bellows tube.
このようにして成形された蛇腹管は，比較的径の細いも
のを得ることができると共に，延伸変形を受けることに
よって機械的強度の大きいものとなっていた。The bellows tube formed in this manner can have a relatively small diameter, and has a large mechanical strength when subjected to stretching deformation.
しかしながら，上記した従来の合成樹脂製蛇腹細管は，
ブロー成形と云う延伸変形を利用した成形方法により成
形されるものであるために，蛇腹部の山部分に延伸変形
が集中することになり，これがため充分な延形変形量を
与えることができず，蛇腹部の谷部分に対する山部分の
高さを充分にとることができないと共に，この蛇腹部の
山部分および谷部分を形成する相隣り合った傾斜壁間の
角度を小さくすることができず，山部分間のピッチが蛇
腹管の径の割には大きなものとならざるを得なかった。However, the conventional synthetic resin bellows tubule described above is
Since it is formed by a forming method that uses stretch deformation called blow molding, stretch deformation concentrates on the ridges of the bellows, which makes it impossible to provide a sufficient amount of stretch deformation. ， The height of the peak part with respect to the valley part of the bellows part cannot be sufficiently secured, and the angle between the adjacent inclined walls forming the peak part and the valley part of the bellows part cannot be reduced, The pitch between the peaks had to be large for the diameter of the bellows tube.
それゆえ，従来の合成樹脂製の蛇腹細管は，その太さの
割には柔軟性に不満のあるものとなっていた。For this reason, the conventional synthetic resin bellows tubules have been unsatisfactory in terms of their flexibility.
本発明は，上記した従来例における問題点および不満を
解消し，充分に柔軟性のある合成樹脂製蛇腹管を得るこ
とを目的としたものである。The present invention is intended to solve the problems and dissatisfactions in the conventional example described above and to obtain a sufficiently flexible synthetic resin bellows tube.
本発明による合成樹脂製の蛇腹管は，蛇腹部の山部分の
延伸量の割には隣り合った山部分間のピッチを充分に小
さくしたもので，以下本発明をその一実施例を示す図面
を参照しながら説明する。The synthetic resin bellows tube according to the present invention has a sufficiently small pitch between adjacent crest portions for the amount of extension of the crest portion of the bellows portion. Will be described with reference to.
本発明による合成樹脂製の蛇腹管１は，直線筒形状をし
た合成樹脂製の細管素材から成形されるものであって，
蛇腹部２の山部分３の頂点部の径延伸率が前記した細管
素材の径に対して1.5〜2.5倍であると共に，谷部分４の
底部の径延伸率が前記した細管素材の径に対して零倍で
あり，また蛇腹部２の山部分３および谷部分４を形成す
る相隣り合った傾斜壁５間の角度である蛇腹角度αが40
〜60度となっている。The bellows tube 1 made of synthetic resin according to the present invention is made of a synthetic resin thin tube material having a linear tubular shape,
The diametrical stretch ratio of the apex portion of the peak portion 3 of the bellows portion 2 is 1.5 to 2.5 times the diameter of the above-mentioned thin tube material, and the radial stretch ratio of the bottom portion of the valley portion 4 is relative to the above-mentioned thin tube material diameter. And the bellows angle α, which is the angle between the adjacent inclined walls 5 that form the peaks 3 and valleys 4 of the bellows 2, is 40
It is ~ 60 degrees.
蛇腹部２における山部分３の頂点部の径延伸率は，細管
素材の径の相違に対応して変化設定されるもので，細管
素材の径が小さいほど，その延伸率は小さくなる。The diametrical stretch ratio of the apex portion of the mountain portion 3 in the bellows part 2 is changed and set in accordance with the difference in the diameter of the thin tube material, and the smaller the diameter of the thin tube material, the smaller the stretch rate.
また，蛇腹角度αは，上記した山部分３の頂点部の延伸
率にほぼ従って決定されるものであって，山部分３の頂
点部の延伸率が大きいほどその角度が大きくなる。Further, the bellows angle α is determined substantially according to the above-described extension ratio of the apex portion of the mountain portion 3, and the larger the extension ratio of the apex portion of the mountain portion 3, the larger the angle.
本発明による蛇腹管１は，上記の如く，山部分３の頂点
部の延伸率が充分に大きく，また蛇腹角度αが充分に小
さい，すなわち隣り合った山部分３間のピッチＰが山部
分３の高さの割には小さいので，各傾斜壁５は，その傾
斜姿勢を蛇腹管１の中心軸に沿った姿勢に近づける方向
に変形させ易くなり，これによってより高い柔軟性を発
揮することができることになる。As described above, the bellows tube 1 according to the present invention has a sufficiently large elongation rate at the apex portion of the crest portion 3 and a sufficiently small bellows angle α, that is, the pitch P between the adjacent crest portions 3 is the crest portion 3. Since it is small relative to the height of each of the slanted walls 5, each slanted wall 5 can be easily deformed in a direction in which the slanted posture is brought closer to the posture along the central axis of the bellows tube 1, and thereby higher flexibility can be exhibited. You can do it.
このように，本発明による蛇腹管１は，山部分３の高さ
の割にはピッチＰが小さいものとなっているのである
が，このような構造の蛇腹管１を細管素材から直接ブロ
ー成形により成形することは不可能である。As described above, in the bellows tube 1 according to the present invention, the pitch P is small for the height of the crest portion 3, but the bellows tube 1 having such a structure is directly blow-molded from a thin tube material. It is impossible to mold by.
なぜならば，このような小さなピッチＰで蛇腹部２を成
形すべく細管素材をブロー成形により延伸させると，延
伸変形が集中する山部分３の頂点部附近の肉厚が極端に
薄くなってしまい，管体としての機械的強度を保持する
とができなくなるからである。This is because when the thin tube material is stretched by blow molding to mold the bellows portion 2 with such a small pitch P, the wall thickness near the apex portion of the mountain portion 3 where the stretching deformation concentrates becomes extremely thin, This is because it becomes impossible to maintain the mechanical strength of the tubular body.
この本発明による蛇腹管１を形成するのに最も有効な成
形方法を，第３図ないし第５図を参照しながら説明す
る。The most effective molding method for forming the bellows tube 1 according to the present invention will be described with reference to FIGS. 3 to 5.
まず，細管素材を延伸成形できる温度に均一に加熱した
状態でバキューム成形金型に組付け，第３図に示した蛇
腹管形状をした中間成形品７にバキューム成形する。First, the thin tube material is assembled into a vacuum forming die while being uniformly heated to a temperature at which it can be stretch-formed, and vacuum formed into the bellows tube-shaped intermediate formed product 7 shown in FIG.
この中間成形品７は，バキューム金型への組付け部分と
なる端管部６を両端に位置させ，中央部分が蛇腹部２に
成形された形状となっている。The intermediate molded product 7 has a shape in which the end tube portions 6 which are parts to be assembled to the vacuum mold are located at both ends and the central portion is molded into the bellows portion 2.
バキューム成形された中間成形品７における蛇腹部２の
蛇腹角度αは，細管素材の肉厚が小さい場合で60度程度
であるが，細管素材の肉厚が大きい場合には90度程度と
なっており，山部分３の頂点部の延伸率は1.5〜2.5倍よ
りもわずかに小さい値でほぼ1.3〜2.2倍程度である。The bellows angle α of the bellows portion 2 in the vacuum-formed intermediate molded product 7 is about 60 degrees when the wall thickness of the thin tube material is small, but is about 90 degrees when the wall thickness of the thin tube material is large. The stretching ratio at the top of the mountain portion 3 is about 1.3 to 2.2 times, which is slightly smaller than 1.5 to 2.5 times.
このバキューム成形された中間成形品７の温度が変形可
能な温度範囲内にある状態で，第４図に示す如く，中間
成形品７に，特に中間成形品７の蛇腹部２に，中間成形
品７の軸心に沿って圧縮力Ｆを作用させて，この蛇腹部
２を圧縮変形させ，同時に冷却を施して本発明による蛇
腹管１の成形を達成する。While the temperature of the vacuum-formed intermediate molded product 7 is within the deformable temperature range, as shown in FIG. 4, the intermediate molded product 7, particularly the bellows portion 2 of the intermediate molded product 7, By applying a compressive force F along the axis of 7, the bellows portion 2 is compressed and deformed, and at the same time, the bellows tube 1 is molded according to the present invention by cooling.
圧縮変形された状態で冷却された蛇腹部２は，相隣り合
った山部分３を接触させた状態にあるが，圧縮力Ｆを取
り去ると，山部分３の頂点部および谷部分４の底部内に
残留している内部応力の作用によって，隣り合った山部
分３を離れさせる方向に変形し，ついには，第５図に示
す如く，蛇腹角度αが40〜60度となったところで安定す
る。The bellows portion 2 cooled in the compressed and deformed state is in a state where the adjacent peak portions 3 are in contact with each other, but when the compressive force F is removed, the peak portion of the peak portion 3 and the bottom of the valley portion 4 are removed. Due to the action of the internal stress remaining in the above, it is deformed in the direction in which the adjacent mountain portions 3 are separated, and finally becomes stable when the bellows angle α becomes 40 to 60 degrees, as shown in FIG.
所で，蛇腹管１は，バキューム成形された中間成形品７
を圧縮変形させて成形されるものであるから，蛇腹部２
を形成する各傾斜壁５の幅の値は，中間成形品７の時と
蛇腹管１の時とで変化がなく，このため蛇腹角度αが小
さくなった分だけ山部分３の頂点部の延伸率は中間成形
品７よりも蛇腹管の方が大きくなる。At this point, the bellows tube 1 is a vacuum-formed intermediate molded product 7
The bellows part 2 is formed by compressing and deforming
The value of the width of each slanted wall 5 forming the same does not change between the case of the intermediate molded product 7 and the case of the bellows tube 1. Therefore, the apex of the mountain portion 3 is extended by the amount that the bellows angle α is reduced. The rate of the bellows tube is higher than that of the intermediate molded product 7.
すなわち、中間成形品７の蛇腹部２を軸心に沿って圧縮
変形させると、各傾斜壁５は軸心に対してほぼ直角姿勢
となるまで立ち上がるので、各傾斜壁５に幅変化がない
こと、および肉厚の関係から谷部分４に比べて山部分３
の方が変形し易いことから、各傾斜壁５の立ち上がり変
形は、谷部分４を不動点とした回動変形となり、山部分
３の頂点部の径は、立ち上がり角度をα／２、傾斜壁５
の幅をｒとすると、ｒ（１−cosα／２）だけ増大し、
この増大した径寸法に対応して増大する周長分だけ山部
分３の頂点部が延伸変形し、山部分３の頂点部の径延伸
率は、中間成形品７時のほぼ１．３〜２．２倍程度から
１．５〜２．５倍に増大するのである。That is, when the bellows portion 2 of the intermediate molded product 7 is compressed and deformed along the axis, the respective inclined walls 5 rise until they are in a posture substantially perpendicular to the axis, so that there is no width change in each inclined wall 5. , And because of the wall thickness, the mountain portion 3 is more than the valley portion 4.
Since it is easier to deform, the rising deformation of each inclined wall 5 becomes a rotational deformation with the valley portion 4 as a fixed point, and the diameter of the apex portion of the mountain portion 3 has a rising angle of α / 2 and the inclined wall. 5
Let r be the width of r, then increase by r (1-cosα / 2),
The apex portion of the crest portion 3 is stretched and deformed by an amount corresponding to the increased circumferential length corresponding to the increased diameter dimension, and the radial stretch ratio of the apex portion of the crest portion 3 is approximately 1.3 to 2 when the intermediate molded product 7 is used. It increases from about 2 times to 1.5 to 2.5 times.
この上記した蛇腹管１の成形方法の場合，中間成形品７
をバキューム成形により成形するので，従来の如く，ブ
ロー成形手段を採用する場合に比べて，細管素材内に挿
入位置させるべき成形のための部材を全く必要とせず，
これがため極めて細い細管素材の蛇腹管１への成形が可
能となる。In the case of the above-mentioned method for molding the bellows tube 1, the intermediate molded product 7
Since it is formed by vacuum forming, there is no need for a forming member to be inserted and positioned in the thin tube material at all, as compared with the conventional case where a blow forming means is adopted,
Therefore, it is possible to form an extremely thin thin tube material into the bellows tube 1.
例えば，ブロー成形手段を利用した従来の細管素材によ
る蛇腹管の成形においては，成形できる細管素材の内径
の下限がせいぜい10mm程度であったのに対し，バキュー
ム成形手段を利用しての細管素材からの蛇腹管１の成形
においては，内径が0.5mmの細管素材を蛇腹管１に成形
することができる。For example, in forming a bellows tube using a conventional thin tube material using blow molding means, the lower limit of the inner diameter of the thin tube material that can be formed is about 10 mm at the most, whereas from the thin tube material using vacuum forming means In forming the bellows tube 1, the bellows tube 1 can be formed of a thin tube material having an inner diameter of 0.5 mm.
次に，実際に成形された蛇腹管１の各部の実測寸法値を
記載する。Next, the actually measured dimensional values of each part of the bellows tube 1 actually formed are described.
実施例の１． 外径1.0mm，内径0.5mm，肉厚0.5mmの細管素材で蛇腹管
１を成形した際，成形された蛇腹管１は，山部分３の外
径2.25mm，谷部分４の外径1.0mm，ピッチ（Ｐ）0.32m
m，蛇腹角度（α）40度，そして山部分３の頂点部の肉
厚0.10mmであった。Example 1 When the bellows tube 1 is formed of a thin tube material with an outer diameter of 1.0 mm, an inner diameter of 0.5 mm, and a wall thickness of 0.5 mm, the formed bellows tube 1 has an outer diameter of 2.25 mm for the crest part 3 and 1.0 mm for the trough part 4. , Pitch (P) 0.32m
m, the bellows angle (α) 40 degrees, and the wall thickness at the top of the mountain portion 3 was 0.10 mm.
実施例の２． 外径3.25mm，内径2.0mm，肉厚1.25mmの細管素材で蛇腹
管１を成形した際，成形された蛇腹管１は，山部分３の
外径7.5mm，谷部分４の外径3.25mm，ピッチ（Ｐ）3.2m
m，蛇腹角度（α）60度，そして山部分３の頂点部の肉
厚が0.35mmであった。2. of the embodiment. When the bellows tube 1 is formed from a thin tube material with an outer diameter of 3.25 mm, an inner diameter of 2.0 mm, and a wall thickness of 1.25 mm, the formed bellows tube 1 has an outer diameter of the peak portion 3 of 7.5 mm and an outer diameter of the valley portion 4 of 3.25 mm. , Pitch (P) 3.2m
m, the bellows angle (α) was 60 degrees, and the thickness of the top of the mountain portion 3 was 0.35 mm.
以上の説明から明らかな如く，本発明による合成樹脂製
蛇腹管は，極めて柔軟性に富んだものとなり，それゆえ
狭い空間内で自在にかつ小さな曲率半径で湾曲変形しな
ければならないスプレー容器における吸上げ管等として
極めて有効に使用することができ，また充分に細い寸法
で成形されることができるので，より狭い空間内での使
用に有利である等優れた効果を発揮するものである。As is apparent from the above description, the synthetic resin bellows tube according to the present invention is extremely flexible, and therefore, the suction tube in a spray container which must be freely deformed in a narrow space with a small radius of curvature. Since it can be used very effectively as a hoisting pipe, etc., and can be molded with a sufficiently small size, it exhibits excellent effects such as being advantageous in use in a narrower space.
第１図は，本発明による蛇腹管の一実施例を示す全体外
観斜視図である。 第２図は，本発明による蛇腹管の要部拡大断面図であ
る。 第３図ないし第５図は，本発明による蛇腹管の成形方法
の一例を示すもので，第３図はバキューム成形された中
間成形品の正面図を，第４図は中間成形品を圧縮変形さ
せると共に，冷却している状態を，そして第５図は成形
された蛇腹管の正面図である。 符号の説明 １；蛇腹管、２；蛇腹部，３；山部分，４；谷部分，
５；斜視壁，６；端管部，７；中間成形品，Ｐ；ピッ
チ，α；蛇腹角度。FIG. 1 is an overall external perspective view showing an embodiment of a bellows tube according to the present invention. FIG. 2 is an enlarged sectional view of a main part of the bellows tube according to the present invention. FIGS. 3 to 5 show an example of a method of forming a bellows tube according to the present invention. FIG. 3 is a front view of a vacuum-formed intermediate molded product, and FIG. 4 is a compression deformation of the intermediate molded product. FIG. 5 is a front view of the molded bellows tube while it is being cooled. Explanation of reference numerals 1; bellows tube, 2; bellows part, 3; mountain part, 4; valley part,
5; perspective wall, 6; end pipe part, 7: intermediate molded product, P: pitch, α: bellows angle.
Claims (1)
成形される蛇腹管であって，蛇腹部(2)の山部分(3)の頂
点部の径延伸率が1.5〜2.5倍で谷部分(4)の底部の径延
伸率が０倍であり，前記蛇腹部(2)の山部分(3)および谷
部分(4)を形成する相隣り合った傾斜壁(5)間の角度が40
〜60度である合成樹脂製蛇腹管。1. A bellows tube formed from a synthetic resin thin tube material having a linear tubular shape, wherein the diametrical expansion ratio of the apex of the peak portion (3) of the bellows portion (2) is 1.5 to 2.5 times. The radial extension ratio of the bottom of the portion (4) is 0 times, and the angle between the adjacent inclined walls (5) forming the peak portion (3) and the valley portion (4) of the bellows portion (2) is 40
A synthetic resin bellows tube that is ~ 60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60057762A JPH0643878B2 (en) | 1985-03-22 | 1985-03-22 | Synthetic resin bellows tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60057762A JPH0643878B2 (en) | 1985-03-22 | 1985-03-22 | Synthetic resin bellows tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61215882A JPS61215882A (en) | 1986-09-25 |
| JPH0643878B2 true JPH0643878B2 (en) | 1994-06-08 |
Family
ID=13064887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60057762A Expired - Fee Related JPH0643878B2 (en) | 1985-03-22 | 1985-03-22 | Synthetic resin bellows tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0643878B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2299520A (en) * | 1940-02-28 | 1942-10-20 | Mine Safety Appliances Co | Method of making extensible conduit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5763176U (en) * | 1980-09-30 | 1982-04-15 | ||
| JPS5990662U (en) * | 1982-12-09 | 1984-06-19 | タイガ−スポリマ−株式会社 | elastic dust cover |
-
1985
- 1985-03-22 JP JP60057762A patent/JPH0643878B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2299520A (en) * | 1940-02-28 | 1942-10-20 | Mine Safety Appliances Co | Method of making extensible conduit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61215882A (en) | 1986-09-25 |
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