JPS5912811A - Tube expander - Google Patents

Tube expander

Info

Publication number
JPS5912811A
JPS5912811A JP12213882A JP12213882A JPS5912811A JP S5912811 A JPS5912811 A JP S5912811A JP 12213882 A JP12213882 A JP 12213882A JP 12213882 A JP12213882 A JP 12213882A JP S5912811 A JPS5912811 A JP S5912811A
Authority
JP
Japan
Prior art keywords
diameter
tube
expander
hollow body
expanded
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.)
Granted
Application number
JP12213882A
Other languages
Japanese (ja)
Other versions
JPS6360698B2 (en
Inventor
Yusuke Mizuno
裕介 水野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP12213882A priority Critical patent/JPS5912811A/en
Publication of JPS5912811A publication Critical patent/JPS5912811A/en
Publication of JPS6360698B2 publication Critical patent/JPS6360698B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/24Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes radial
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06Making preforms having internal stresses, e.g. plastic memory
    • B29C61/08Making preforms having internal stresses, e.g. plastic memory by stretching tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To obtain a tube expander that can provide an intended thermo shrinkable tube efficiently by expanding the diameter of a resin tube made of a specified expandable hollow body having tree or more fin parts that are folded in the longitudinal direction. CONSTITUTION:The tube expander 10 that is made from plastic (or rubber) material (such as polyester) and provided with 3-12 fin parts 1 folded along longitudinal direction. Using the above-mentioned tube expander 10; (1) the tube expander 10 that has been sealed in advance at one end is inserted into the blank tube 2 heated up to the intended temperature, then, (2) compressed air is supplied from the other end of the tube expander 10 to give the tube expander 10 internal pressure and to expand the tube expander 10 in order of 10', 10'', 10''' and then, (3) the blank tube 2 is expanded with the tube expander up to the intended step. Thereafter, it is cooled, hardened and the expander is removed to provide the thermo shrinkable tube 2'.

Description

【発明の詳細な説明】 本発明はプラスチック系及びゴム系のチューブ或いはチ
ューブ状異形材を拡径するための反復使用可能な管材用
拡径子、特に前記管材を所定の拡径倍率まで拡大するこ
とにより所定の熱収縮率を有する熱収縮性チューブ或い
はチューブ状異形材を製造するのに適した管材用拡径子
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a reusable tube expander for expanding the diameter of plastic and rubber tubes or tubular profiles, particularly for expanding the tube to a predetermined diameter expansion ratio. The present invention relates to a diameter expander for tube material suitable for manufacturing heat-shrinkable tubes or tubular profiles having a predetermined heat shrinkage rate.

ここに「熱収縮性」とは、拡径された管材が熱の作用に
より収縮してほぼ拡径前の形状を回復する性質、即ち「
熱回復性」を意味するものである。
Here, "heat shrinkability" refers to the property of a pipe whose diameter has been expanded to contract due to the action of heat and almost recover its shape before diameter expansion.
It means "heat recoverability".

従来、プラスチック系及びゴム系のチューブ或いはチュ
ーブ状異形材を拡径することにより熱収縮性を付与する
には、(イ)加熱したチューブ或いはチューブ状異形材
の内部に圧力を加え、外型でサイジングして拡径する方
法、(ロ)加圧容器内で加熱したチューブを大気中に取
出して圧力差により拡径する方法、(ハ)加熱チューブ
或いは異形材の内部IC機械的な拡径機能を有する拡径
子を挿入して拡径する方法、或いはに)規定の形状のマ
ンドレルに加熱チューブを強制的に挿入して拡径する方
法等が採用されている。
Conventionally, in order to impart heat shrinkability by expanding the diameter of plastic or rubber-based tubes or tubular profiles, the following steps were taken: (a) Applying pressure inside the heated tube or tubular profile, and (b) A method of expanding the diameter by taking out the tube heated in a pressurized container into the atmosphere and using a pressure difference; (c) A mechanical diameter expansion function of the internal IC of the heated tube or profiled material. A method of expanding the diameter by inserting a diameter expander having a diameter, or a method of expanding the diameter by forcibly inserting a heating tube into a mandrel of a prescribed shape, etc.

これらの従来方法には下記のような重大な欠点があるこ
とが知られている。即ち、(イ)内圧による拡径法では
チューブ及び異形材共に規定の寸法及び形状に仕上げる
ためのサイジング装置が必要で、加熱拡径された状態の
熱収縮性材料とサイジング装置との間の摩擦及び軸方向
の伸びにより軸方向に歪が発生し、熱収縮時の寸法安定
性に問題のあ・るのがvf通である1、またこの方法で
は拡径される部材にP径方向或いは軸線方向に偏肉があ
る場合には相対的に簿い所から拡径が開始するため、よ
り一層偏肉が強調される欠点を有している。(ロ)圧力
差による拡径法ではト記と同様にサイジング装置による
軸方向の希及び偏肉の問題があるつG−1機械的な拡径
法では拡径機能を具備した拡径子を1層コンパクトに設
n1、製作するには限界があり、小サイズのチューブ及
び異形材の拡径には不向きで、特に高拡祥倍率のチュー
ブを得るのは(幾械的に非常に困難で、仮に出来たとし
ても非常に高価なものとなるうに)マンドレルによる拡
径法では加熱軟化したチューブをマンドレルに挿入する
のが困難で、人力により或いは1幾械的に挿入する場合
に歪の均一な分布、外観等に問題がある、また、異形材
の場合にはマンドレルを分割する必要が生じ、歪の均一
分布、外観、作異性等に問題が多く、また拡径後にiン
ドレルを引抜くのが困難である。
These conventional methods are known to have serious drawbacks as described below. In other words, (a) the diameter expansion method using internal pressure requires a sizing device to finish both the tube and the profiled material into specified dimensions and shapes, and the friction between the heat-shrinkable material in its expanded diameter state and the sizing device This method causes distortion in the axial direction due to the elongation of the material and the axial direction, which poses a problem in dimensional stability during heat shrinkage. If there is a thickness unevenness in the direction, the diameter expansion starts from a relatively small point, which has the disadvantage that the thickness unevenness is further emphasized. (B) In the diameter expansion method using pressure difference, there are problems of thinning and uneven thickness in the axial direction due to the sizing device, as in (G). There is a limit to the number of layers that can be manufactured, and it is not suitable for expanding the diameter of small-sized tubes and irregularly shaped materials. In the mandrel diameter expansion method, it is difficult to insert the heat-softened tube into the mandrel (even if the tube is very expensive), and it is difficult to insert the heated tube into the mandrel manually or mechanically. There are problems with the appearance, etc. Also, in the case of irregularly shaped materials, it is necessary to divide the mandrel, which causes many problems with the uniform distribution of strain, appearance, workability, etc., and it is difficult to pull out the I-drel after diameter expansion. It is.

本発明の目的はこれらの従来法の問題点を解決し、所定
の拡径倍率、換言すれば所定の熱収縮率を有する小サイ
ズから大サイズまでの熱収縮性チューブ或いは異形材を
同一原理で極めて容易に製造することができる管材用拡
径子を提供するにある。
The purpose of the present invention is to solve the problems of these conventional methods, and to produce heat-shrinkable tubes or profiled materials from small to large sizes having a predetermined diameter expansion ratio, in other words, a predetermined heat shrinkage rate, using the same principle. An object of the present invention is to provide a diameter expander for pipe material that can be manufactured extremely easily.

本発明は、プラスチック系及びゴム系のチューブ或いは
チューブ状異形材を拡径するための拡径子で、少なくと
も8個の同じ長さのフィン部が形成されるように軸方向
に折りたたまれた形状の膨張可能な中空体であり【、前
記フィン部は互に等角度間隔で位置しかつ前記中空体の
長手方向の軸線に平行に延在し、内圧を加えること忙よ
り膨張して所定の太さの中空体となし得るようにしたこ
とを特徴とする管材用拡径子である。
The present invention relates to a diameter expander for expanding the diameter of a plastic or rubber tube or a tubular profile, which is folded in the axial direction to form at least eight fins of the same length. It is an expandable hollow body, and the fin portions are located at equal angular intervals and extend parallel to the longitudinal axis of the hollow body, and expand to a predetermined thickness when internal pressure is applied. This is a diameter expander for pipe material, characterized in that it can be made into a hollow body.

次に本発明を図面を参照して例について説明する。The invention will now be explained by way of example with reference to the drawings.

本発明の拡径子10は、第1図に示すように、少なくと
も3個、好ましくは3〜8個の同じ長さのフィン部1が
形成されるように軸方向に折りたたまれた形状の膨張可
能な中空体である。フィン部lは互に等角度間隔に位f
改し、第2図に示すように中空体IOの長手方向の軸線
に平行に延在する1第1a図、稟lb図及び第1C図は
それぞれ411+Xl、8個及び12個のフィン部1を
設けた中空体である本発明の拡径子の異なる三つの例の
拡大断面図で、第2a図及び第2b図はそれぞれ第1a
図及びmlb図の拡径子の主要部の斜視図でk)る。本
発明の拡径子では、内圧を加えることにより中空体を膨
張することができ、このために例えば中荒体の投手方向
の一端を密封し他の一端に圧縮空気導入口を設ける。
The diameter expander 10 of the present invention is expandable in an axially folded shape so that at least three, preferably three to eight, equal length fins 1 are formed, as shown in FIG. It is a hollow body. The fin parts l are spaced at equal angular intervals f
As shown in FIG. 2, 1 extending parallel to the longitudinal axis of the hollow body IO, FIGS. FIGS. 2a and 2b are enlarged sectional views of three different examples of the diameter expander of the present invention, which is a hollow body provided, and FIGS. 2a and 2b are respectively
Figure k) is a perspective view of the main parts of the diameter expander in Figure and MLB Figure. In the diameter expander of the present invention, the hollow body can be expanded by applying internal pressure, and for this purpose, for example, one end of the hollow body in the pitching direction is sealed and a compressed air inlet is provided at the other end.

本発明の拡径子を構成する材料は、拡径子を管材の拡径
に用いた際に、所定の拡大された径及び形状を保持する
のに必要な熱及び圧力に充分に耐え、かつ全体が所定の
径以上には膨張せず、しかも拡径された管材の長手軸線
方向の延び及び歪を小さくしかつ寸法安定性を得るのに
充分な強度を角する月料であって、折りたたまれたフィ
ン部1・は繰返し使用に耐える強度、折り曲げ性、及び
ある一度の柔軟性を有し、かつ減圧後に原形に復元する
ものが望ましい。かかる材料としてはプラスチック系材
料のシート、例えば、ポリエステル樹脂、ポリアミド樹
脂、フッ素樹脂、アクリル樹脂、ポリイミド樹脂等のよ
うな耐熱性プラスチック樹脂のシート、或いはゴム系材
料のシート、例えば、非加硫型又は加硫型の天然ゴム、
及び8BR,CR。
The material constituting the diameter expander of the present invention has the ability to sufficiently withstand the heat and pressure necessary to maintain a predetermined expanded diameter and shape when the diameter expander is used to expand the diameter of a pipe material, and to maintain the overall diameter. A tube that does not expand beyond a predetermined diameter and has sufficient strength to reduce the longitudinal extension and distortion of the expanded tube and obtain dimensional stability, and is folded. It is desirable that the fin portion 1 has strength to withstand repeated use, bendability, and flexibility for a certain period of time, and restores to its original shape after depressurization. Examples of such materials include sheets of plastic materials, such as sheets of heat-resistant plastic resins such as polyester resins, polyamide resins, fluorine resins, acrylic resins, polyimide resins, etc., or sheets of rubber materials, such as non-vulcanized sheets. or vulcanized natural rubber,
and 8BR, CR.

IR%I IR,BRSF!PR,シリコーンゴム、ウ
レタンゴム等のような合成ゴムのシートである。第8a
図はかかるプラスチック材料、例えばポリエステル樹脂
のシートから作った本発明の拡径子の1個のフィン部1
0部分拡大断面図である。
IR%I IR,BRSF! It is a sheet of synthetic rubber such as PR, silicone rubber, urethane rubber, etc. Chapter 8a
The figure shows one fin portion 1 of an expander according to the invention made from a sheet of such plastic material, for example polyester resin.
FIG. 0 is an enlarged sectional view of the 0 part.

本発明の拡径子により達成される拡径倍率は次の通りで
ある。第1b図に示す拡径子を用いる場合には、8個の
フィン部lの半径方向の長さbを規定するととKより、
内径が2bより若干大きいチューブを最大で(8X 2
b/* ) / 2h # 31.5倍まで拡径するこ
とができる。また、第1c、図に示す拡径子を用いる場
合には、1.2個のフィン部1の半径方向の長さhを規
定することにより、内径が2bより若干大きいチューブ
を最大で(12X 2h/*)/2 hζ;3.8倍ま
で拡大することができる。このように、本発明の拡径子
では、フィン部の個数を増減することによっ【拡径倍率
を増減でき、従ってフィン部の個数の異なるt重々の拡
径子を用いることにより拡径前内径が同一であるチュー
ブから拡径倍率の異なる神々の拡径チューブを得ること
が、でき、また拡径後内径が同一であっても、拡径倍率
の異なる神々の拡径子を用いることにより熱収シ「1;
率のj′もなる種々の熱収剤性チューブを得ることがで
きる利点があり、骨材を呻々の拡径倍率まで(広径でき
る。
The diameter expansion magnification achieved by the diameter expander of the present invention is as follows. When using the expander shown in FIG. 1b, the radial length b of the eight fins l is defined by K.
Up to a tube with an inner diameter slightly larger than 2b (8X 2
b/* ) / 2h # The diameter can be expanded up to 31.5 times. In addition, when using the diameter expander shown in Figure 1c, by specifying the radial length h of 1.2 fin portions 1, the tube with an inner diameter slightly larger than 2b can be made up to (12X 2h /*)/2 hζ; Can be enlarged up to 3.8 times. In this way, in the diameter expander of the present invention, the diameter expansion magnification can be increased or decreased by increasing or decreasing the number of fins, and therefore, by using multiple diameter expanders with different numbers of fins, the inner diameter before diameter expansion can be increased. It is possible to obtain expanded diameter tubes with different diameter expansion magnifications from the same tube, and even if the inner diameter is the same after diameter expansion, by using divine diameter expanders with different diameter expansion magnifications, the heat sink can be improved. “1;
It has the advantage of being able to obtain various heat absorbing tubes with a ratio of j', and the aggregate can be expanded to an extremely large diameter.

本発明の拡径子lOを用いて管材の拡径を行うプロセス
の各段階を第4図について説明する。拡径子としては第
1b図に示すような8個のフィンtibNを設けた中空
体を用いる。先ず轡第4&図に示すように、所要の温度
に加熱した原チューブ2に予じめ一端を、密封した拡径
子10を挿入する。次いで、拡径子の技手方向の一端か
らノズルなどを介して圧縮空気を供給して拡径子に所要
の内圧を加える。この拡径子のフィン部が若干膨張して
断面星形中空体10′になった段階を第4b図に、更に
膨張が進行して断面8角形中空休10“になった段階を
第4C図に、完全に膨張して断面円形中空体10#にな
った段階を第4d図に示す。所要の□段階まで拡径した
後にチューブを冷却固化し、□内圧を減じ、次いで拡径
したチューブな拡径子から抜き取る。
Each step of the process of expanding the diameter of a tube using the diameter expander IO of the present invention will be described with reference to FIG. As the diameter expander, a hollow body provided with eight fins tibN as shown in FIG. 1b is used. First, as shown in Figure 4, one end of the sealed expander 10 is inserted into the original tube 2 which has been heated to a desired temperature. Next, compressed air is supplied from one end of the diameter expander in the operator's direction through a nozzle or the like to apply a required internal pressure to the diameter expander. Figure 4b shows the stage at which the fin portion of the expander expands slightly and becomes a star-shaped hollow body 10' in cross-section, and Figure 4C shows the stage at which the expansion progresses further and the cross-section becomes an octagonal hollow body 10''. Figure 4d shows the stage at which the tube has expanded completely to become a hollow body with a circular cross section of 10#.After expanding the diameter to the required □ stage, the tube is cooled and solidified, the □ internal pressure is reduced, and then the expanded tube is expanded. Remove it from the diaphragm.

かかる拡径子は規定の径以上に膨張せずかつ長手軸線方
向の伸び及び歪がないことが望ましく、そのためには拡
径子を構成するのに用いる上述のプラスチック系又はゴ
ム系材料のシートには、少くとも1層以上の補強用クロ
スを、その片面又は両面に密着させるか或いは両面の中
間位置に設けるのが好ましい。第3b図及び第8C図は
それぞれ、iaa図のフィン部lを構成するシートの外
面又は内面Ellめ補−用りr11層8を密着させた例
であり、第8d図は前記シートの両面にそれぞれ1層の
補強用クロス層8を密着させた例であり、第8e図及び
第8f図はそれぞれ前記シートの両面の中間に1層及び
2層の補強用クロス層8を設けた例である。かかる補強
用クロス層′の織方向は拡径子の半径方向及び長手方向
の軸線に平行に配置−されているのが好ましい。かかる
補強用クロス層で補強した材料からなる拡径子を用いる
ととKより半径方向の膨張が同一で、長手軸線方向の伸
び及び歪のない熱収縮性管材を得ることができる。
It is desirable that such a diameter expander does not expand beyond a specified diameter and that there is no elongation or distortion in the longitudinal axis direction, and for this purpose, the sheet of the above-mentioned plastic or rubber material used to construct the diameter expander should include: It is preferable that at least one layer of reinforcing cloth be closely attached to one or both surfaces, or provided at an intermediate position between both surfaces. Figures 3b and 8C are examples in which a supplementary layer 8 is adhered to the outer or inner surface of the sheet constituting the fin portion l in Figure iaa, and Figure 8d is an example in which a complementary layer 8 is adhered to both sides of the sheet. This is an example in which one reinforcing cloth layer 8 is placed in close contact with each other, and FIGS. 8e and 8f are examples in which one and two reinforcing cloth layers 8 are provided in the middle of both sides of the sheet, respectively. . The weaving direction of such reinforcing cloth layer' is preferably arranged parallel to the radial and longitudinal axes of the expander. By using a diameter expander made of a material reinforced with such a reinforcing cross layer, it is possible to obtain a heat-shrinkable tube with the same radial expansion as K and no elongation or distortion in the longitudinal axis direction.

かかる補強用クロス層で補強した材料からなる。It consists of a material reinforced with such a reinforcing cross layer.

拡径子による他の利点は、多少の偏肉があってもフィン
部の先端が内圧を加えた時点で最初に原チューブに・接
触し、しかも内圧が均一に加わっているため、その接触
部の位置は変化せず、その他の各部で拡径が開始して第
4b図に示すように断面星形に膨張し、次いでこの断面
星形の谷部“が原チューブと接触して更實拡径が進行し
、最後に拡径゛が完了するため、偏肉の影響が充分緩和
される点、及び拡径子自体が長手軸線方向に伸びず、ま
た内圧によって生ずる原チューブと拡径子との間の摩擦
により歪が発生せず、寸法安定性の優れた熱収縮性チュ
ーブが得られることである。
Another advantage of the diameter expander is that even if there is some uneven thickness, the tip of the fin will first contact the raw tube when internal pressure is applied, and since the internal pressure is applied evenly, the contact area will be The position does not change, and the other parts begin to expand in diameter to have a star-shaped cross section as shown in Figure 4b, and then the valleys of this star-shaped cross-section come into contact with the original tube, causing the diameter to expand. progresses and finally the diameter expansion is completed, so the influence of uneven thickness is sufficiently alleviated, the expander itself does not stretch in the longitudinal axis direction, and the gap between the original tube and the expander caused by internal pressure is It is possible to obtain a heat-shrinkable tube that is free from distortion due to friction and has excellent dimensional stability.

本発明の拡径子を多数本使用することにより、例えば同
じサイズの拡径子10を3本使用することにより、第5
a図に示すような断面形状の直の原チューブ2を第5b
図に示すような断面形状の拡径チューブ2′に拡径する
ことができ、各種の径の拡径子を組合せることにより任
意の形状、任意の径のものが拡径可能になる。更に、チ
ューブ状異形材、例えば第6a図に示すような三叉分岐
管に熱収縮性を付与することも可能であり、この場合に
は、第6b図に断面を示すように、同一の8本の拡径子
ioを1本ずつ、8本の分岐した管Aのそれぞれを通し
て未分岐管状部Bまで挿入し、これを第6c図に示す状
態まで拡径すると、第6d図に示す熱収縮性チューブ状
異形材を得ることができ、このようにして異形材に熱収
縮性を付与することも可能である。
By using a large number of diameter expanders of the present invention, for example, by using three diameter expanders 10 of the same size, the fifth
A straight raw tube 2 having a cross-sectional shape as shown in Fig. 5b is
It is possible to expand the diameter of the tube 2' having a cross-sectional shape as shown in the figure, and by combining expanders of various diameters, it is possible to expand the diameter of the tube to any shape and diameter. Furthermore, it is also possible to impart heat shrinkability to a tubular profile, for example a three-pronged branch pipe as shown in Figure 6a; in this case, eight identical tubes, as shown in cross section in Figure 6b, are One by one, the diameter expanders io are inserted through each of the eight branched tubes A to the unbranched tubular portion B, and the diameter is expanded to the state shown in FIG. 6c, resulting in the heat-shrinkable tube shown in FIG. 6d. It is possible to obtain shaped profiles, and in this way it is also possible to impart heat-shrinkable properties to the profiles.

本発明の拡径子を用いて管材を拡径する場合には、管材
が直のチューブ又はチューブ状異形材のいずれであって
も、拡径後冷却固化した後の拡径子は、内圧を減じるこ
とにより容易に引抜くことができる等極めて作業性が優
れていて無限の可能性を有し、工業的価値が大きい。
When expanding the diameter of a tube using the expander of the present invention, regardless of whether the tube is a straight tube or a tubular irregular shape, the expander should be used to reduce the internal pressure after being cooled and solidified after expansion. It has extremely good workability, such as being able to be easily pulled out, has infinite possibilities, and has great industrial value.

次に本発明を図面を参照して例について説明する。The invention will now be explained by way of example with reference to the drawings.

実施例 l 第1c図に示すような12個のフィン部lを持ち、フィ
ン部lの半径方向の長さbが5 mmで、NE a a
図に示すようにポリエステル樹脂シートから作られ、補
強用クロスを用いてない肉厚o、’77F1mの本発明
の拡径子を用いて、内径1 i mmm、肉厚2mm、
、長さ8 (l Ommの架橋ポリエチレン系チューブ
を拡径した 先ず、この原チューブを加熱装置で約15o℃に加熱し
、取り出した後直ちにこのチューブに予じめ一端を密封
した拡径子を挿入し、拡径子の長手方向の他の一端から
予め取り付けたノズルを介して圧縮空気を供給して約1
 、0 keg”の空気圧で拡径した。拡径後直ちに水
冷固化し、内圧を減じ、次いで拡径したチューブを拡径
子がら抜き取り、寸法を測定した。かくして、第4c図
に示す多角形と同様な12角形の断面形状を有し、内周
長116 mm (内径換算871濯φ)、肉厚0.7
mm。
Example l It has 12 fin parts l as shown in Fig. 1c, the radial length b of the fin parts l is 5 mm, and NE a a
As shown in the figure, using the diameter expander of the present invention made from a polyester resin sheet and having a wall thickness of o and '77F1m without using a reinforcing cloth, an inner diameter of 1 mm, a wall thickness of 2 mm,
, a cross-linked polyethylene tube with a length of 8 (l Omm) was expanded in diameter. First, this raw tube was heated to about 15oC with a heating device, and immediately after taking it out, a diameter expander with one end sealed in advance was inserted into the tube. Then, compressed air is supplied from the other longitudinal end of the diameter expander through a nozzle installed in advance for about 1 hour.
, 0 keg" of air pressure. Immediately after the diameter expansion, the tube was water-cooled and solidified, the internal pressure was reduced, and the expanded tube was extracted from the expander and its dimensions were measured. Thus, the polygon was similar to the polygon shown in Figure 4c. It has a dodecagonal cross-sectional shape, an inner circumference length of 116 mm (inner diameter equivalent to 871 mm), and a wall thickness of 0.7 mm.
mm.

長さ297 rnmの熱収縮性チューブを得た。A heat-shrinkable tube with a length of 297 nm was obtained.

−寒」1殊−」ユ 第1b図に示すような8個のフィン部1を持ち、フィン
部の半径方向の長さhがi o imで、拡径子の半径
方向及び軸線方向に一致する織方向を有する1層のガラ
スクロス8の内側及び外側をシリコーンゴムで被覆して
加硫硬化した第80図に示すような合計肉厚o、5rI
L=の拡径子を用いて、内径22mrrLφ、肉厚2 
am 1長さ1.000 inのFiPR−PE混和系
の架橋チューブを、実施例1におけると同様に拡径、冷
却固化したものについて寸法を測定した結果、第4d図
に示すよ5にほぼ円形で、内径的48 mmm、肉厚1
.1mm、長さ998 mmの熱収縮性チューブ2/を
得た。
- Cold weather 1 special - It has eight fin parts 1 as shown in Figure 1b, and the radial length h of the fin parts is i o im, which coincides with the radial direction and axial direction of the diameter expander. The inner and outer sides of one layer of glass cloth 8 having a weaving direction are coated with silicone rubber and cured by vulcanization.The total wall thickness is o, 5rI as shown in Fig. 80.
Using a diameter expander of L=, inner diameter 22 mrrLφ, wall thickness 2
As a result of measuring the dimensions of a FiPR-PE mixed cross-linked tube with a length of 1.000 inches, expanded in the same manner as in Example 1, and cooled and solidified, it was found that it was approximately circular as shown in Figure 4d. So, the inner diameter is 48 mm, and the wall thickness is 1.
.. A heat-shrinkable tube 2/ having a diameter of 1 mm and a length of 998 mm was obtained.

実施例 8 実施例2と同様な8個のフィン部1を持った拡径子8本
を、内径4・5 mmm、肉厚2mm、iさ5 (10
fimのEPR−PE混和系の140℃に加熱した架橋
チューブに、第5a図に示すように挿入してチューブの
一端を密封し、次いで各拡径子に同時K i、5 kl
m”の空気圧を封入して第5b図に示すように拡径した
後、水冷固化し、その寸法を測定した。かくして、内周
長305 mm (内径換n約97 m、mm)、肉厚
1.1mm、平均長さ494mtnの熱収縮性チューブ
2/を得た。
Example 8 Eight diameter expanders having eight fins 1 similar to those in Example 2 were prepared with an inner diameter of 4.5 mm, a wall thickness of 2 mm, and an i size of 5 (10
fim's EPR-PE admixture heated to 140° C., one end of the tube was sealed as shown in Figure 5a, and then each expander was injected with a simultaneous K i, 5 kl.
The diameter was expanded as shown in Figure 5b by enclosing an air pressure of 1.5 m, and then solidified by water cooling, and its dimensions were measured.Thus, the inner circumference length was 305 mm (inner diameter conversion n approximately 97 m, mm), and the wall thickness was 305 mm. A heat-shrinkable tube 2/ having a diameter of 1.1 mm and an average length of 494 mtn was obtained.

実施例 4 第6a図に示すような8本の分岐した管A;内q、蝦2
2 ntmφ、軸線方向の長さ100mm、肉厚3m1
nと、未分岐管状部B:内径47 m、mm、lll]
 #j方向の長さ150fim、肉厚a mmとからな
るB P R−PE混和系の架橋した三叉分岐管を14
0 ’Cに加熱し、直ちに管Aのそれぞれを通して管状
部Bまで実施例2と同じ拡径子1oを第6b図に示すよ
うに挿入し、これらの拡径子に1 、5 kpm”の空
気を刺入して拡径し、水冷同化後寸法な測定した。
Example 4 Eight branched pipes A as shown in Figure 6a; inner q, shrimp 2
2 ntmφ, axial length 100mm, wall thickness 3m1
n and unbranched tubular part B: inner diameter 47 m, mm, lll]
14 cross-linked three-pronged branch pipes made of BPR-PE mixture and having a length in the #j direction of 150 fim and a wall thickness of a mm.
Immediately insert the same expanders 1o as in Example 2 through each of the tubes A to the tubular part B as shown in Figure 6b, and pierce these expanders with air at 1.5 kpm''. The diameter was expanded, and the dimensions were measured after water cooling and assimilation.

かくして、第6d図に示すよりなC:内径4・8mm−
、長さ98mm、肉厚1.9m、及びD:内周長805
 mm (内径換算的97 mm−)、長さ147mm
 、肉厚1.8@tytに拡径された熱収縮性三叉分岐
管を得た。
Thus, the diameter C shown in Figure 6d: inner diameter 4.8 mm-
, length 98mm, wall thickness 1.9m, and D: inner circumference length 805
mm (inner diameter equivalent: 97 mm), length 147 mm
A heat-shrinkable three-pronged branch pipe with a diameter expanded to a wall thickness of 1.8@tyt was obtained.

実施例 6 実施例2と同様な8個のフィン部を持った拡径子を用い
て、内径22.7Flφの架橋PE系チューブを拡径し
た。この原チューブの長さ及び円周上時計回りに等間隔
に8ケ所(第1部分〜第8部分)で測定した肉厚は第1
表に示す通りであった。このチューブを140℃に加熱
し、直ちに拡径・子を挿入し、内圧1 、0 klV’
c*”で拡径した後、水冷固化し、その寸法を測定した
。この結果、第1表に示す肉厚を有する内径的48 m
m−の8角形チユーブが得られた。この各部の肉厚は原
チューブからほば同率で減少しており、また拡径後のチ
ューブの長さは49211mで、歪の発生が少なかった
Example 6 Using a diameter expander having eight fins similar to that in Example 2, a crosslinked PE tube having an inner diameter of 22.7 Flφ was expanded. The length of this original tube and the wall thickness measured at eight equally spaced locations (first to eighth parts) clockwise on the circumference are the first
It was as shown in the table. Heat this tube to 140°C, immediately insert the diameter expansion tube, and reduce the internal pressure to 1 and 0 klV'.
c*", the diameter was solidified by water cooling, and its dimensions were measured. As a result, the inner diameter was 48 m with the wall thickness shown in Table 1.
An m-octagonal tube was obtained. The wall thickness of each part was reduced at approximately the same rate as that of the original tube, and the length of the tube after diameter expansion was 49,211 m, with little strain occurring.

比較例 1 実施例5で用いたと同じ原チーーブを次□の分法で拡径
した。長さ約1mの原−ユニブを内径四〇mmφの鉄パ
イプの両端に気密になるよ5に固定し、かつ圧縮空気を
封入できる状態となし、次いで恒温槽内で鉄パイプ及び
原チューブを14 (1’Cになるまで均一に加熱し、
直ちにl 、 Okrm”の空気圧で拡径した後、水冷
固化してから取り出した。この拡径チューブの軸線方向
の中間部分500mmを切断し、その肉厚を実施例、5
と同様に円周上時計回りに等間隔に8ケ所で測定した。
Comparative Example 1 The same original tube as used in Example 5 was expanded in diameter by the following dividing method. A raw unit with a length of about 1 m was fixed to both ends of an iron pipe with an inner diameter of 40 mm in an airtight manner so that compressed air could be filled in. Then, the iron pipe and raw tube were heated in a thermostatic oven for 14 hours. (Heat evenly until 1'C,
Immediately, the diameter was expanded using an air pressure of 1,000 m, and the tube was solidified by water cooling before being taken out. The axially intermediate portion of this expanded tube was cut by 500 mm, and its wall thickness was measured according to Example 5.
Similarly, measurements were taken at eight equally spaced locations clockwise on the circumference.

最も薄い第1部分の近傍のみが拡径されて肉+9.が0
.2〜0.3順程度になったが、最も厚い第5部分の肉
厚は2・1〜2・2 am 刹tとんど延伸さ慧てゝ゛
なゝ゛状態あった。更に1このチューブを150℃で2
0分間加熱して完全に収縮させた後に長さを測定した結
果、薄い第1部分近傍で4+ 4 Q mWL、厚(7
第す部分近傍で465 mmであり、軸線方向の歪が可
成り大きく、寸法が不安定となることが判った。
Only the area near the thinnest first part is expanded to have a thickness of +9. is 0
.. However, the thickness of the fifth portion, which is the thickest, was 2.1 to 2.2 am. 1 more time this tube at 150℃
As a result of measuring the length after heating for 0 minutes to completely shrink, the result was 4+4 Q mWL near the thin first part, thickness (7
It was found that the strain in the axial direction was quite large, making the dimensions unstable, with a diameter of 465 mm near the second part.

上述のように、少なくとも8個の同じ長さのフィン部が
形成されるように軸方向に折りたたまれ・た形状の1脹
可能な中空体である本発明の拡径子□、を用いて拡径す
る。場合には、従来の内圧或いは差圧拡径法を用いて、
、拡径する場合と比較し【、拡径5チユ亡プけその軸:
1fR方向の歪が小さく、熱収縮時の寸法安定性が優れ
、また原チューブに多少の偏肉があっても拡径時に緩和
される利点を有する。
As described above, the diameter is expanded using the diameter expander □ of the present invention, which is an inflatable hollow body that is folded in the axial direction so that at least eight fins of the same length are formed. do. In some cases, using conventional internal pressure or differential pressure expansion methods,
, compared to the case of expanding the diameter [5 shafts of expanded diameter:
It has the advantage that the strain in the 1fR direction is small, the dimensional stability during heat shrinkage is excellent, and even if the original tube has some uneven thickness, it is alleviated during diameter expansion.

本・発明の拡径子は、機械的鉱径法と比較した場合に、
il、径子の大きさを小形化でき、しかもフィン部のt
r・q a′tをiff mlすることにより容易に高
拡径率の・9ものを14することができるう更K、マン
ドレル法に比1jii2 tして11シの均一な分布が
可能で、機械的或いは人力による抑込み時の外観の不均
一性が全(1,c (、また拡径後のマンドレルの解体
、引抜作業の繁雑さ及びf″11tI#さかなく、拡?
F子の内圧を減じること・により容易忙取り出すことが
できるほか、異形成いは、vL径用のものも容易に設計
、製作可能で、利用範囲が極めて広い。
The diameter expander of this invention has the following characteristics when compared with the mechanical diameter method:
il, the diameter of the diameter can be reduced, and the t of the fin part can be reduced.
By adjusting r.q a't, it is possible to easily reduce the diameter of .9 to 14 with a high diameter expansion ratio, and compared to the mandrel method, it is possible to achieve a uniform distribution of 11. The non-uniformity of the appearance when mechanically or manually pressed in (1, c (, also, the complexity of dismantling and pulling out the mandrel after diameter expansion, and the difficulty of expansion).
By reducing the internal pressure of the F element, it can be easily taken out, and it is also easy to design and manufacture products for VL diameters, making it extremely versatile.

【図面の簡単な説明】[Brief explanation of the drawing]

第1a図、第1b図及び第1c図はそれぞれ本発明の拡
径子の異なる例の拡大断面図、第2a図及び第2b図は
それぞれ第1a図及び第1b図の拡径子の主要部の斜視
図、 第8a図、第3b図、第8C図、第8 d図、第8e図
及び第8f図はそれぞれ本発明の拡径子の異なる例の部
分拡大断面図、 第4a図、第4b図、第4c図及び第4d図はそれぞれ
本発明の拡径子01例を用いて管材の拡径を行うプロセ
スの各段階を示す説明図、第5a図及び第5b図はそれ
ぞれ本発明の拡径子の1例を3本組合せてチューブを拡
径した場合の拡径前及び拡径後の状態を示す断面図、第
6a図及び第6d図はそれぞれ本発明の拡径子01例を
8本組合せて三叉分岐管を拡径した場合の拡径前及び拡
径後のチューブの斜視図、第6b図及び第6C図はそれ
ぞれ本発明の拡径子の1例を挿入した状態の第6a図及
び第6d図のチューブの断面図である。 l・・°フィン部、2・・・原チューブ、2/・・・拡
径チューブ(熱収縮性チューブ)、3・・・補強用クロ
ス(ガラスクロス)、10 、10’、 Ill’、 
10′・・・拡径子(中空体)、A・・・分岐した71
^、B・・・未分岐管状部、C・・・拡径後のA、D・
・・拡径後のB、I)・・・フイ゛ン部の半径方向の長
さ。 特許出願人  古河電気工業株式会社 手続補正書 昭和57年 9月9日 1、事件の表示 昭和57年特 許 願第122138  号2、発明の
名称 管材用拡径子 3、補正をする者 事件との関係特許出願人 (5211)古河電気工業株式会社 b・ 6、補正の対象 明細書の発明の詳細な説明の欄、図面
7、矧iIEの内容 (別紙の通り) l、明細書第14頁第20行の「第6d図」を「第6C
図および第ad図」に訂正する。 2、図面中、第6b図、第6C図および第6d図を別紙
「1正図のように訂正する。 (iTil:趨 手続補正書 昭和58年 5月231 1、事件の表示 ) 昭和57年 特  51願第1221.38号2、発明
の名称 管拐用拡径子 3、補正をする者 事件との関係 特許出願人 (529)古河電気工業株式会社 、(1)明細書第8頁第20行の1一端」を「他端」に
・訂正する。 (2)同第18頁第20行および第15頁第6行の1を
持った」を「を持ち、ポリエステルクロスを用いた」に
訂正する。 (3)図面中、第1b図およびIC図を訂正図に示すよ
うに訂正する。 代理人弁理士   杉  村  暁  秀外1名 〔〒
1a, 1b and 1c are enlarged sectional views of different examples of the diameter expander of the present invention, and FIGS. 2a and 2b are perspective views of the main parts of the diameter expander of FIGS. 1a and 1b, respectively. 8a, 3b, 8c, 8d, 8e and 8f are partially enlarged sectional views of different examples of the diameter expander of the present invention, FIGS. 4a, 4b, and 8f, respectively. Figures 4c and 4d are explanatory diagrams showing each stage of the process of expanding the diameter of a tube material using the diameter expander 01 of the present invention, and Figures 5a and 5b are respectively illustrations of the diameter expander 01 of the present invention. Figures 6a and 6d are cross-sectional views showing the state before and after diameter expansion when three tubes are combined to expand the diameter of the tube, and Figures 6a and 6d are three-pronged branches made by combining eight examples of the diameter expander 01 of the present invention. The perspective views of the tube before and after the diameter expansion of the tube, Figures 6b and 6C are respectively the same as those of Figures 6a and 6d with an example of the diameter expander of the present invention inserted. FIG. 3 is a cross-sectional view of the tube. l... °fin part, 2... raw tube, 2/... enlarged diameter tube (heat shrinkable tube), 3... reinforcing cloth (glass cloth), 10, 10', Ill',
10'... Expander (hollow body), A... Branched 71
^, B... Unbranched tubular part, C... A, D after diameter expansion
...B, I) after diameter expansion...Radial length of the fin part. Patent Applicant: Furukawa Electric Co., Ltd. Procedural Amendment September 9, 1981 1, Case Description 1982 Patent Application No. 122138 2, Title of Invention: Diameter Expander for Pipe Materials 3, Person Making the Amendment Related patent applicant (5211) Furukawa Electric Co., Ltd. b. 6, Subject of amendment Detailed description of the invention in the specification, Drawing 7, Contents of the IIE (as attached) l, Specification, page 14, No. The 20th line “Figure 6d” is changed to “6C
Figures and Figures ad. 2. In the drawings, Figures 6b, 6C, and 6d are corrected as shown in Attachment ``1. Patent Application No. 51 No. 1221.38 2, Name of the invention: Conduit expander 3, Relationship to the case of the person making the amendment Patent applicant (529) Furukawa Electric Co., Ltd. (1) Specification, page 8, No. 20 Correct ``one end'' of the line to ``the other end.'' (2) In the same page, page 18, line 20, and page 15, line 6, ``1'' was corrected to ``and polyester cloth was used.'' (3) In the drawings, Figure 1b and IC diagram are corrected as shown in the correction diagram. Representative Patent Attorney Akira Sugimura Hidegai (1 person)

Claims (1)

【特許請求の範囲】 t プラスチック系及びゴム系のチューブ或いはチュー
ブ状異形材を拡径するための管材用拡径子で、少なくと
も8個の同じ長さのフィン部が形成されるように軸方向
に折りたたまれた形状の膨張可能な中空体であって、前
記フィン部は互に等角度間隔に位置し〜かつ前記中空体
の長手方向の軸線に平行に地声し、、内圧を加える1に
より膨張して所!?太、さの中空体となし得るようにし
た0とを%!とする管材用拡径子。 1 前記膨張可能な中空体が3〜8個の*、記フィン部
を持ったものである特許請求の範囲第1項記載の拡径子
。 & 前記膨張可囮な中空体を構成する材料がシラスチッ
ク系或いはゴム系材料のシートである特許請求の範囲第
1項又は第2項記載の拡径子。 表 前記膨張可能な中空体を構成する材料がプ□ ラス
チック系或いはゴム系材料のシートの片−而、両面又は
両面の中間位置に少なくとも1層・以トの補強用クロス
層を設けた補強シート□ である特許請求の範囲第1項
又は第9項記載の拡径子。 翫 前記補強用クロス層が天然繊維、無機繊維及び合成
繊維からなる群から選定した繊維のクロス層である特許
請求の範囲第1項記載の拡径子。゛   □ a□前記補強用クロス層が前記膨張可能な中空・ 体の
半径方向及び長手方向の軸線に平行な織・・ 方向に配
置されている特許請求の範囲第4項又は第5項記載の拡
径子。
[Scope of Claims] t. A diameter expander for tube materials for expanding the diameter of plastic and rubber tubes or tubular profiled materials, the diameter of which is expanded in the axial direction so that at least eight fins of the same length are formed. an expandable hollow body in a folded shape, the fin portions being located at equal angular intervals and extending parallel to the longitudinal axis of the hollow body; and expanding by applying internal pressure. And then! ? 0 and % that can be made into a hollow body of thickness and size! Diameter expander for pipe material. 1. The diameter expander according to claim 1, wherein the expandable hollow body has 3 to 8 fin portions. & The diameter expander according to claim 1 or 2, wherein the material constituting the expandable hollow body is a sheet of a silastic or rubber material. Table: The material constituting the expandable hollow body is a reinforcing sheet with at least one or more reinforcing cross layers provided on one side of a sheet of plastic or rubber material, or on both sides or at an intermediate position between both sides. □ The diameter expander according to claim 1 or 9. The diameter expander according to claim 1, wherein the reinforcing cloth layer is a cloth layer of fibers selected from the group consisting of natural fibers, inorganic fibers, and synthetic fibers.゛ □ a□ The reinforcing cloth layer is arranged in a direction parallel to the radial and longitudinal axes of the expandable hollow body. Expander.
JP12213882A 1982-07-15 1982-07-15 Tube expander Granted JPS5912811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12213882A JPS5912811A (en) 1982-07-15 1982-07-15 Tube expander

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12213882A JPS5912811A (en) 1982-07-15 1982-07-15 Tube expander

Publications (2)

Publication Number Publication Date
JPS5912811A true JPS5912811A (en) 1984-01-23
JPS6360698B2 JPS6360698B2 (en) 1988-11-25

Family

ID=14828548

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12213882A Granted JPS5912811A (en) 1982-07-15 1982-07-15 Tube expander

Country Status (1)

Country Link
JP (1) JPS5912811A (en)

Also Published As

Publication number Publication date
JPS6360698B2 (en) 1988-11-25

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