JPH0673922B2 - Manufacturing method of rubber tube with bellows - Google Patents
Manufacturing method of rubber tube with bellowsInfo
- Publication number
- JPH0673922B2 JPH0673922B2 JP4309745A JP30974592A JPH0673922B2 JP H0673922 B2 JPH0673922 B2 JP H0673922B2 JP 4309745 A JP4309745 A JP 4309745A JP 30974592 A JP30974592 A JP 30974592A JP H0673922 B2 JPH0673922 B2 JP H0673922B2
- Authority
- JP
- Japan
- Prior art keywords
- bellows
- rubber
- rubber tube
- tube
- mandrel
- 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 - Lifetime
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蛇腹形状を少なくとも
一部に有するゴムチユーブの製造方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a rubber tube having a bellows shape in at least a part thereof.
【０００２】[0002]
【従来の技術】自動車用の燃料フイラーチユーブやエア
ークリーナーチユーブ管は、耐衝撃性を向上させる等の
目的でチユーブの一部又は全部が蛇腹状になつている。
蛇腹状という複雑な形状を有するため、これらの製品の
ほとんどはインジエクシヨン成型等の型成型により製造
されている。しかし、そのような成型方法では、内層及
び外層にそれぞれ異なったゴム材料を持つ多層ゴムチユ
ーブの製造は困難である。2. Description of the Related Art In a fuel filler tube or an air cleaner tube for an automobile, a part or all of the tube has a bellows shape for the purpose of improving impact resistance.
Because of the complicated shape of bellows, most of these products are manufactured by die molding such as indie molding. However, with such a molding method, it is difficult to manufacture a multilayer rubber tube having different rubber materials in the inner layer and the outer layer.
【０００３】蛇腹のない多層構造を持つゴムチユーブや
ゴムホースは自動車用に多く用いられ、これらは押出成
型によつて容易に得られる。押出成型した未加硫のゴム
チユーブを蛇腹形状を有し連通孔を備えたマンドレルに
外嵌し、加硫中にマンドレル内を減圧することによつて
蛇腹形状を有する加硫ゴムチユーブを製造する方法は、
特公平２−１６６９２に開示されている。Rubber tubes and rubber hoses having a multilayer structure without bellows are often used for automobiles, and they can be easily obtained by extrusion molding. A method for manufacturing a vulcanized rubber tube having a bellows shape by externally fitting an extruded unvulcanized rubber tube to a mandrel having a bellows shape and having a communication hole, and depressurizing the inside of the mandrel during vulcanization is ,
It is disclosed in Japanese Examined Patent Publication No. 2-16692.
【０００４】しかし、この方法で得られる蛇腹チユーブ
は、中空マンドレルの連通孔に沿ってゴムが流れること
に起因して、内面に数ミリメートル程度の糸状突起が形
成されることを避けられない。この突起は、内部を流れ
る流体の流れを阻害したり、使用中に切れて、思わぬト
ラブルの原因となる危険がある。However, in the bellows tube obtained by this method, it is unavoidable that thread-like projections of about several millimeters are formed on the inner surface due to the rubber flowing along the communication holes of the hollow mandrel. There is a risk that the protrusions may obstruct the flow of fluid flowing inside or may break during use, causing unexpected trouble.
【０００５】この糸状突起の形成を防ぐ方法として、特
公平４−８６２４６は、減圧によつて蛇腹形状に成型し
たのちマンドレル内の圧力が外部の圧力と等しくなるま
で加圧する方法を提案している。しかし、この方法は、
未加硫ゴムの加熱による軟化流動と加硫反応による硬化
のタイミングの調整が非常に困難である。As a method for preventing the formation of these thread-like projections, Japanese Patent Publication No. 4-86246 proposes a method of forming a bellows shape by depressurization and then applying pressure until the pressure inside the mandrel becomes equal to the external pressure. . But this method
It is very difficult to adjust the softening flow of unvulcanized rubber by heating and the timing of curing by vulcanization reaction.
【０００６】[0006]
【発明が解決しようとする問題点】本発明の目的は、前
記した従来技術の欠点を解消し、内面に糸状突起やパー
テイングラインのない蛇腹形状のゴムチユーブを、加硫
と加減圧のタイミングの調整を必要としない方法によつ
て製造することにある。DISCLOSURE OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a bellows-shaped rubber tube having no thread-like projections or a parting line on the inner surface thereof for vulcanization and depressurization. It is to be manufactured by a method that does not require adjustment.
【０００７】[0007]
【問題を解決するための手段】本発明の本質的特徴は、
蛇腹を形成させるためにキユアバツグを用いることにあ
る。すなわち、本発明に従えば、加硫ゴム製のチユーブ
状キユアバツグを、中空部を有し且つ中空部から外部へ
貫通する多数の連通孔を備えたマンドレルに外嵌してそ
の両端をシールし、これに未加硫ゴムチユーブを外嵌し
たのち、蛇腹状の形状を持った金型に仕込み、加熱しな
がらマンドレル内に圧力をかけてキユアバツグをふくら
ませ、それに伴って、軟化流動性の未加硫ゴムチユーブ
を蛇腹状の金型に沿って押し広げ、その状態で加熱する
ことによつて、目的とする蛇腹付きゴムチユーブを成型
することができる。The essential features of the present invention are:
It is to use the cure bug to form the bellows. That is, according to the present invention, a vulcanized rubber tube-shaped curing bag is externally fitted to a mandrel having a hollow portion and a large number of communication holes penetrating from the hollow portion to the outside, and both ends thereof are sealed, After fitting the unvulcanized rubber tube to this, it is charged into a mold having a bellows shape, pressure is applied to the inside of the mandrel while heating to inflate the curing bag, and along with this, the softened fluidized unvulcanized rubber tube. The desired rubber tube with a bellows can be molded by pressing and spreading the resin along a bellows-shaped mold and heating in that state.
【０００８】このような本発明の方法によつて得られる
蛇腹付きのゴムチユーブは、内面に糸状突起やパーテイ
ングラインがなく、且つ、加硫のあいだ加硫ゴム製のマ
ンドレルに押しつけられているため、仕込まれた未加硫
ゴムチユーブのチユーブ内面が多少荒れていても滑らか
な内面に仕上がる。The bellows-provided rubber tube obtained by the method of the present invention has no thread-like protrusions or parting lines on the inner surface and is pressed against the vulcanized rubber mandrel during vulcanization. , Even if the inside of the tube of the unvulcanized rubber tube that has been charged is a little rough, the inside surface will be smooth.
【０００９】用いる加硫ゴム製のチユーブ状のキユアバ
ツグの材料は、加硫温度で或る程度の耐熱性があり且つ
蛇腹状の変形に耐え得るものであることが必要である。
具体的には、エチレンプロピレンゴム、エチレンアクリ
ルゴム、アクリルゴム、シリコンゴム、フツ素ゴム等を
用いることができる。キユアバツグは加硫成型した蛇腹
付のゴムチユーブから容易に離れなければならないが、
これはキユアバツグの表面をオイル、金型離型剤等で処
理することによつて達成される。従つて、製造しようと
する蛇腹付きのゴムチユーブとキユアバツグは、同一の
ゴム材料でも差し支えない。It is necessary that the vulcanized rubber tube-shaped curing material used has a certain degree of heat resistance at the vulcanization temperature and can withstand bellows-like deformation.
Specifically, ethylene propylene rubber, ethylene acrylic rubber, acrylic rubber, silicon rubber, fluorine rubber, or the like can be used. The curing bag must be easily separated from the vulcanized rubber bellows with bellows,
This is achieved by treating the surface of the curing bag with oil, a mold release agent or the like. Therefore, the rubber tube with bellows and the curing bag to be manufactured may be made of the same rubber material.
【００１０】キユアバツグの両端のマンドレルへのシー
ルの方法は、加圧時に洩れることのない限り、どのよう
な方法をもとることができる。具体的には、バンドじ
め、針金じめ、マンドレルへの接着等の方法をとること
ができる。As a method for sealing the mandrels at both ends of the curing bag, any method can be used as long as it does not leak when pressurized. Specifically, methods such as band binding, wire binding, and adhesion to a mandrel can be used.
【００１１】マンドレル内に加硫中にかける最適の圧力
は、用いた加硫ゴム製のキユアバツグの剛性、用いた未
加硫ゴムの流動特性、加硫温度、蛇腹の山谷の深さ等で
変わるが、通常は２〜１０kgf／cm2が適当である。 マンドレル内に圧力をかけるタイミングは、未加硫ゴム
が加硫を始める前であるならば良く、加熱軟化するのを
待つ必要はない。The optimum pressure applied to the mandrel during vulcanization varies depending on the rigidity of the cured rubber used, the flow characteristics of the unvulcanized rubber used, the vulcanization temperature, the depth of the bellows and the like. However, 2 to 10 kgf / cm 2 is usually suitable. The timing of applying pressure to the mandrel may be before the unvulcanized rubber starts to be vulcanized, and it is not necessary to wait for heating and softening.
【００１２】製造しようとする蛇腹付きのゴムチユーブ
の原材料である未加硫物は、本発明のメリツトを生かす
意味で多層構造のものが好ましいが、単層構造であつて
も差し支えない。The unvulcanized material, which is the raw material of the rubber tube with a bellows to be produced, preferably has a multi-layer structure in order to make the best use of the advantages of the present invention, but it may have a single-layer structure.
【００１３】未加硫ゴムチユーブが加硫ゴム製のキユア
バツグにより内側から押しつけられ蛇腹状の金型に沿っ
て軟化流動する際に閉じ込められた空気を逃すため、蛇
腹状の金型に、例えばその山の頂点に、複数の０.５〜
１mm径程度のベント穴をあけておくことが望ましい。そ
の場合、蛇腹状の加硫ゴムチユーブの対応個所、例えば
山の頂点、に数mm程度の糸状突起ができるが、この突起
はゴムチユーブの外側にあるため仕上げ工程で容易に除
去することが可能であり、また、除去しなくても、チユ
ーブの性能に支障を来たすものではない。The unvulcanized rubber tube is pressed from the inside by the curing rubber-made curing bag from the inside to soften and flow along the bellows-shaped mold, so that the trapped air is released. At the top of
It is desirable to open a vent hole with a diameter of about 1 mm. In that case, a thread-like protrusion of about several mm can be formed at the corresponding location of the bellows-shaped vulcanized rubber tube, for example, the apex of the mountain, but since this protrusion is outside the rubber tube, it can be easily removed in the finishing process. Moreover, even if it is not removed, it does not affect the performance of the tube.
【００１４】[0014]
【実施例】添付図面に示す装置を用いて蛇腹付きゴムチ
ユーブを製造した。この装置において、多数の連通孔１
１を有する中空マンドレル１は、一方の端が閉じられて
おり、他方の端には取付け金具５を介して耐圧ホース６
が接続されており、キユアバツグ２は、エチレン・アク
リルゴム製で、表面がシリコン系の金型離型剤で処理さ
れており、マンドレル１に外嵌されたのちシールのため
に両端が針金１０でしばられている。EXAMPLE A rubber tube with a bellows was manufactured using the apparatus shown in the accompanying drawings. In this device, a large number of communication holes 1
1 has a hollow mandrel 1 closed at one end, and a pressure-resistant hose 6 is attached to the other end via a fitting 5.
The curing bag 2 is made of ethylene / acrylic rubber, and the surface of the curing bag 2 is treated with a silicone-based mold release agent. After being fitted onto the mandrel 1, both ends are covered with a wire 10 for sealing. Being tied up.
【００１５】キユアバツグの外径よりやゝ大きな内径を
持ち約３mmの肉厚を持つフツ素ゴム製の未加硫チユーブ
３をキユアバツグに外嵌したのち、１７０℃に加熱され
た、ベント穴９を有する蛇腹形状付き金型４に仕込み、
加圧用バルブ７から耐圧ホース６及び取付け金具５を経
て加圧空気を中空マンドレル１の内部に導くことによ
り、表−１に示す種々の条件で加硫成型し、次いでベン
ト用バルブ８から圧力を抜き、金型４を開いた。得られ
た蛇腹付きゴムチユーブの成型状態を、表−２に示す。An unvulcanized tube 3 made of fluorocarbon rubber having an inner diameter slightly larger than the outer diameter of the curing bag and having a wall thickness of about 3 mm was fitted onto the curing bag, and then the vent hole 9 heated to 170 ° C. was formed. Charge the mold 4 with the bellows shape,
By introducing pressurized air from the pressurizing valve 7 to the inside of the hollow mandrel 1 through the pressure resistant hose 6 and the fitting 5, the vulcanization molding is performed under various conditions shown in Table 1, and then the pressure is applied from the vent valve 8 Then, the mold 4 was opened. The molded state of the obtained rubber tube with bellows is shown in Table-2.
【００１６】[0016]
【表１】 [Table 1]
【００１７】 上表のデータは、条件（１）では圧力がゴムの流動のた
めにも加硫中の発泡を抑えるためにも不足であつたこ
と、また、条件（２）では圧力がゴムの流動のためには
充分であつたが発泡を抑えるためには不足であつたこと
を示している。[0017] The data in the above table shows that the pressure was insufficient under the condition (1) for the flow of the rubber and for suppressing foaming during vulcanization, and under the condition (2) because the pressure was for the flow of the rubber. However, it was insufficient to suppress foaming.
【００１８】一方、条件（７）及び（８）でのデータ
は、圧力をかけるタイミングがおそくて加硫が一部始ま
ったゴムを圧力で押し広げて流した結果として、良好な
蛇腹が得られず且つ発泡が起ってしまつたことを示して
いる。On the other hand, the data of the conditions (7) and (8) show that a good bellows is obtained as a result of spreading the rubber which has been partially vulcanized due to the delayed timing of pressure application and flowing it. In addition, it shows that foaming has occurred.
【００１９】そして、その他の条件でのデータは、すべ
て良好な蛇腹付きゴムチユーブが得られたことを示して
いる。The data under the other conditions show that good rubber bellows with bellows were obtained.
【００２０】[0020]
【発明の効果】以上詳述したように、本発明の成型方法
で得られる蛇腹付きゴムチユーブは内側にパーテイング
ラインや突起がなく滑らかであり、また、多層構造のも
のとすることが容易に可能である。これは、従来の成型
方法では達成し得なかったものであり、工業的に極めて
有用である。As described above in detail, the bellows-containing rubber tube obtained by the molding method of the present invention is smooth without a parting line or protrusion inside and can be easily formed into a multi-layer structure. Is. This cannot be achieved by the conventional molding method, and is industrially extremely useful.
【図１】図面は、本願発明の方法を実施するのに好適な
装置の断面略示図である。FIG. 1 is a schematic cross-sectional view of an apparatus suitable for carrying out the method of the present invention.
１ 中空マンドレル ２ 加硫ゴム製キユアバツグ ３ 未加硫ゴムチユーブ ４ 蛇腹形状付き金型 ５ 取付け金具 ６ 耐圧ホース ７ 加圧用バルブ ８ ベント用バルブ ９ ベント穴 １０ シール用針金 １１ 連通孔 1 Hollow Mandrel 2 Cure Rubber Bag 3 Vulcanized Rubber 3 Unvulcanized Rubber Tube 4 Mold with Bellows Shape 5 Mounting Hardware 6 Pressure Hose 7 Pressure Valve 8 Vent Valve 9 Vent Hole 10 Seal Wire 11 Communication Hole
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 105:24 Ｂ２９Ｌ 23:18 4Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display area B29K 105: 24 B29L 23:18 4F
Claims (1)
する多数の連通孔を備えたマンドレルに、加硫ゴム製の
チユーブ状のキユアバツグを外嵌してその両端をシール
し、これに未加硫ゴムチユーブを外嵌したのち、蛇腹状
の形状を持った金型に仕込み、加熱しながらマンドレル
内に圧力をかけ、ふくらんだキユアバツグによつて未加
硫ゴムチユーブを蛇腹状の金型に沿って押し広げ、加硫
する、ことを特徴とする内側にパーテイングラインや突
起のない蛇腹付きゴムチユーブの成型方法。1. A tube-shaped curing bag made of vulcanized rubber is externally fitted to a mandrel having a hollow portion and a large number of communication holes penetrating from the hollow portion to the outside, and both ends thereof are sealed. After fitting the unvulcanized rubber tube onto the mold, it is charged into a mold with a bellows shape, pressure is applied to the mandrel while heating, and the unvulcanized rubber tube is moved along the bellows mold with a bulging curing bag. A method of molding a rubber tube with a bellows without a parting line or protrusion inside, which is characterized by pressing, spreading and vulcanizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4309745A JPH0673922B2 (en) | 1992-10-26 | 1992-10-26 | Manufacturing method of rubber tube with bellows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4309745A JPH0673922B2 (en) | 1992-10-26 | 1992-10-26 | Manufacturing method of rubber tube with bellows |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06134887A JPH06134887A (en) | 1994-05-17 |
| JPH0673922B2 true JPH0673922B2 (en) | 1994-09-21 |
Family
ID=17996790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4309745A Expired - Lifetime JPH0673922B2 (en) | 1992-10-26 | 1992-10-26 | Manufacturing method of rubber tube with bellows |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0673922B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2850217B2 (en) * | 1996-02-03 | 1999-01-27 | 明邦工業株式会社 | Blow molding method using cold parison |
| DE10302883B4 (en) * | 2003-01-25 | 2021-06-24 | Contitech Luftfedersysteme Gmbh | Vulcanization process and vulcanization device with bellows for car air springs |
| JP2005164031A (en) * | 2003-11-11 | 2005-06-23 | Nippon Techno:Kk | Flexible drain pipe |
| WO2007058553A2 (en) * | 2005-11-18 | 2007-05-24 | Alan Mark Crawley | Profiling of tubes |
| CN101454250B (en) | 2006-05-25 | 2012-10-24 | 麻省理工学院 | Method for shaping sheet thermoplastic and the like |
| CN110856984A (en) * | 2018-08-24 | 2020-03-03 | 深圳市美好创亿医疗科技有限公司 | Hot-pressing processing die and textile layer hot-pressing cladding threaded hose |
| CN114619654A (en) * | 2022-03-28 | 2022-06-14 | 浙江科赛新材料科技有限公司 | Preparation method of plastic corrugated pipe |
-
1992
- 1992-10-26 JP JP4309745A patent/JPH0673922B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06134887A (en) | 1994-05-17 |
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