JPH10272633A - Method for manufacturing rubber hose and mandrel used for the same - Google Patents
Method for manufacturing rubber hose and mandrel used for the sameInfo
- Publication number
- JPH10272633A JPH10272633A JP7938297A JP7938297A JPH10272633A JP H10272633 A JPH10272633 A JP H10272633A JP 7938297 A JP7938297 A JP 7938297A JP 7938297 A JP7938297 A JP 7938297A JP H10272633 A JPH10272633 A JP H10272633A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- rubber hose
- diameter portion
- mandrel
- small
- 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
Links
Landscapes
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
(57)【要約】
【課題】 両端が拡径されたゴムホースを容易に、かつ
安価に得る。
【解決手段】 小径部１５の径と略同一の内径の未加硫
または半加硫状態のゴムホース素材２０ａを、マンドレ
ル１０の挿入ガイド部１８から差し込む。挿入ガイド部
は、先端が縮径され徐々に大径にされているので、ゴム
ホース素材は挿入ガイド部に沿ってスムーズに大径部１
７に挿入される。さらに、大径部を通過し、円錐台部１
６、小径部１５、円錐台部１４及び大径端部１３の根元
にまで円滑に差し込まれる。大径部の通過によりゴムホ
ース素材がわずかに拡径されるが、小径部に位置するゴ
ムホース素材を手で押さえながら小径部に押し付けてな
じませることにより、わずかな拡径部分が元の径に戻さ
れる。この状態で、ゴムホース素材の加硫成形を行い、
両端側が拡径されたゴムホース２０が得られる。
(57) [Problem] To easily and inexpensively obtain a rubber hose having both ends enlarged in diameter. SOLUTION: An unvulcanized or semi-vulcanized rubber hose material 20a having substantially the same inner diameter as the diameter of a small diameter portion 15 is inserted from an insertion guide portion 18 of a mandrel 10. Since the tip of the insertion guide section is gradually reduced in diameter at the tip, the rubber hose material can smoothly move along the insertion guide section to the large diameter section 1.
7 is inserted. Furthermore, it passes through the large diameter portion and
6. The small-diameter portion 15, the truncated cone portion 14, and the large-diameter end portion 13 are smoothly inserted into the roots. The rubber hose material is slightly expanded by passing through the large-diameter part, but by pressing the rubber hose material located at the small-diameter part against the small-diameter part while allowing it to fit, the slightly expanded part returns to its original diameter. It is. In this state, vulcanization molding of the rubber hose material is performed,
The rubber hose 20 whose both ends are enlarged in diameter is obtained.
Description
【０００１】[0001]
【発明の技術分野】本発明は、両端側が拡径されたゴム
ホースの製造方法、及びこれに用いるマンドレルに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rubber hose having both ends expanded, and a mandrel used for the method.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】従来、ゴ
ムホース内を通過する流体の流量を調整するためには、
ホース内にオリフィスを設けて行われていた。しかし、
ホース内に別部材であるオリフィスを設けることは煩雑
であるため、ホース自体の中間部分を細くし両端を拡径
したゴムホースが求められている。このような両端拡径
のゴムホースを大量に製造するには、図５に示すよう
に、固定部５の根元に拡径部２を有すると共に挿入先端
側にも拡径部４を有し、中間に小径部３を有するマンド
レル１を使用する必要がある。2. Description of the Related Art Conventionally, to adjust the flow rate of a fluid passing through a rubber hose,
This was done with an orifice in the hose. But,
Since it is complicated to provide an orifice, which is a separate member, in the hose, a rubber hose in which the middle part of the hose itself is thinned and both ends are enlarged is required. In order to mass-produce such a rubber hose having a large diameter at both ends, as shown in FIG. 5, the large diameter portion 2 is provided at the base of the fixing portion 5 and the large diameter portion 4 is provided at the insertion tip side. It is necessary to use the mandrel 1 having the small-diameter portion 3.
【０００３】しかし、このマンドレル１の小径部３の外
径と略同一内径の未加硫ゴムホースを、先端の拡径部４
から挿入しようとすることは非常に困難であり、このマ
ンドレル１を用いて両端拡径ゴムホースを量産すること
は、実質的に不可能である。本発明は、上記した問題を
解決しようとするもので、両端が拡径されたゴムホース
を簡易に、かつ安価に得ることができるゴムホースの製
造方法を提供することを目的とする。However, an unvulcanized rubber hose having the same inner diameter as the outer diameter of the small diameter portion 3 of the mandrel 1 is connected to the enlarged diameter portion 4 at the tip.
It is very difficult to insert the rubber hose from both ends, and it is practically impossible to mass-produce the rubber hose with both ends expanded using this mandrel 1. An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a method for manufacturing a rubber hose that can easily and inexpensively obtain a rubber hose having both ends enlarged in diameter.
【０００４】[0004]
【課題を解決するための手段及び発明の効果】上記目的
を達成するために、上記請求項１に係る発明の構成上の
特徴は、固定部から連続してかつ同軸的に大径端部と、
中間の小径部と、先端側の大径部とを設けると共に、大
径部に先端に向けて縮径された円錐台形の挿入ガイド部
を取り付けてなるマンドレルを用い、小径部と略等しい
内径の未加硫または半加硫のゴムホース素材を挿入ガイ
ド部から外挿してマンドレルの固定部の根元に当接する
まで差込んで固定した後、この状態でゴムホース素材を
加硫するようにしたことにある。Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to claim 1 is that the large-diameter end portion is continuously and coaxially connected to the fixed portion. ,
An intermediate small-diameter portion and a large-diameter portion on the distal end side are provided, and a mandrel having a large-diameter portion attached with a frustoconical insertion guide portion reduced in diameter toward the distal end is used. An extra-vulcanized or semi-vulcanized rubber hose material is extrapolated from the insertion guide, inserted and fixed until it comes into contact with the base of the fixed part of the mandrel, and then the rubber hose material is vulcanized in this state .
【０００５】上記のように構成した請求項１の発明にお
いては、小径部と略等しい内径の未加硫または半加硫の
ゴムホース素材を挿入ガイド部からマンドレルに外挿す
ることにより、ゴムホース素材が徐々に拡径されるの
で、先端の大径部を容易に通過させることができ、マン
ドレルの固定部の根元に当接するまで容易に差込むこと
ができる。そして、大径部を通過することによりわずか
に拡径されたままの小径部に差し込まれたゴムホース素
材については、手で押さえる等により小径部に押し付け
てなじませることにより元の径に戻すことができる。こ
の状態で、ゴムホース素材に加硫処理を施すことによ
り、両端が拡径されたゴムホースを容易に得ることがで
きる。その結果、請求項１の発明によれば、両端に拡径
部を設けたゴムホースを、簡易な作業により安価に製造
することができる。[0005] In the first aspect of the present invention, an unvulcanized or semi-vulcanized rubber hose material having an inner diameter substantially equal to that of the small-diameter portion is externally inserted into the mandrel from the insertion guide portion. Since the diameter is gradually increased, the large diameter portion at the tip can be easily passed through, and the mandrel can be easily inserted until it comes into contact with the base of the fixed portion. And, for the rubber hose material inserted into the small diameter part that has been slightly expanded by passing through the large diameter part, it can be returned to the original diameter by pressing it against the small diameter part by pressing it by hand etc. it can. By subjecting the rubber hose material to vulcanization in this state, a rubber hose having both ends enlarged can be easily obtained. As a result, according to the first aspect of the invention, a rubber hose having enlarged diameter portions at both ends can be manufactured at a low cost by a simple operation.
【０００６】また、上記請求項２に係る発明の構成上の
特徴は、前記請求項１に記載のゴムホースの製造方法に
おいて、挿入ガイド部の先端から小径部の少なくとも一
部に至る部分に空孔を設けると共に、空孔から小径部の
表面に開口する複数の貫通孔を設け、マンドレルにゴム
ホース素材を差し込んだ状態で、挿入ガイド部の端部か
ら吸気して、空孔内を負圧状態にすることにある。According to a second aspect of the present invention, in the method of manufacturing a rubber hose according to the first aspect, a hole is formed in a portion extending from a tip of the insertion guide portion to at least a part of the small diameter portion. And a plurality of through-holes that open from the holes to the surface of the small-diameter portion.In a state where the rubber hose material is inserted into the mandrel, air is sucked in from the end of the insertion guide portion, and the inside of the holes is brought into a negative pressure state. Is to do.
【０００７】上記のように構成した請求項２の発明にお
いては、空孔内を負圧状態にすることにより、大径部を
通過することによりわずかに拡径されたままで小径部に
差し込まれたゴムホース素材と、小径部に挟まれた空間
内の空気が、貫通孔を通して吸引される。そのため、わ
ずかに拡径されたゴムホース素材が引っ張られて小径部
に密着し、拡径状態が是正されて元の内径に自動的に戻
される。その結果、請求項２の発明によれば、上記請求
項１の発明の効果に加えて、拡径されたゴムホース素材
の径が自動的に是正されるので、ゴムホース素材のマン
ドレルへの差込み作業がさらに容易にされる。In the second aspect of the present invention, the inside of the hole is inserted into the small-diameter portion while being slightly expanded by passing through the large-diameter portion by setting the inside of the hole to a negative pressure state. Air in the space between the rubber hose material and the small diameter portion is sucked through the through hole. Therefore, the slightly expanded rubber hose material is pulled and closely adhered to the small diameter portion, and the expanded state is corrected, and the original inner diameter is automatically returned. As a result, according to the invention of claim 2, in addition to the effect of the invention of claim 1, the diameter of the expanded rubber hose material is automatically corrected, so that the work of inserting the rubber hose material into the mandrel can be performed. Made easier.
【０００８】また、上記請求項３に係る発明の構成上の
特徴は、前記請求項１または請求項２に記載のゴムホー
スの製造方法において、大径部を、小径部の端部に着脱
可能に取り付けたことにある。上記のように請求項３に
係る発明を構成したことにより、ゴムホース素材の加硫
成形後のゴムホースの抜取り時に、小径部から大径部を
取り外すことにより、ゴムホースの小径部をマンドレル
の先端側の大径部を通過させなくても良いので、引き抜
き作業を容易にすることができる。また、大径部の通過
によるゴムホースの小径部の変形等も防止できる。その
結果、上記請求項１ないし請求項２の発明の効果に加え
て、ホース引き抜き作業を安価にかつ信頼性良く行うこ
とができる。According to a third aspect of the present invention, in the method of manufacturing a rubber hose according to the first or second aspect, the large diameter portion is detachably attached to the end of the small diameter portion. I have attached it. By configuring the invention according to claim 3 as described above, the rubber hose material is removed from the small diameter portion at the time of removal of the rubber hose after vulcanization molding of the rubber hose material. Since it is not necessary to pass through the large-diameter portion, the drawing operation can be facilitated. Further, deformation of the small diameter portion of the rubber hose due to passage of the large diameter portion can be prevented. As a result, in addition to the effects of the first and second aspects of the present invention, the hose pulling operation can be performed at low cost and with high reliability.
【０００９】また、上記請求項４に係る発明の構成上の
特徴は、未加硫または半加硫のゴムホース素材が外挿さ
れるマンドレルであって、固定部から連続してかつ同軸
的に、大径端部と、中間の小径部と、先端側の大径部と
を設けると共に、大径部に先端に向けて縮径された円錐
台形の挿入ガイド部を取り付けてなることにある。上記
のように構成した請求項４の発明によれば、このマンド
レルを用いることにより、上記請求項１に示した製造方
法を実施することができ、その結果、両端に拡径部を設
けたゴムホースを、簡易な作業により安価に製造するこ
とができる。A structural feature of the invention according to claim 4 is a mandrel into which an unvulcanized or semi-vulcanized rubber hose material is extrapolated. A radial end portion, an intermediate small-diameter portion, and a large-diameter portion on the distal end side are provided, and a frustoconical insertion guide portion reduced in diameter toward the distal end is attached to the large-diameter portion. According to the invention of claim 4 configured as described above, the manufacturing method described in claim 1 can be performed by using the mandrel, and as a result, the rubber hose having the enlarged diameter portions at both ends is provided. Can be manufactured at low cost by a simple operation.
【００１０】また、上記請求項５に係る発明の構成上の
特徴は、前記請求項４に記載のマンドレルにおいて、挿
入ガイド部から小径部の少なくとも一部に至る部分に空
孔を設けると共に、空孔から小径部の表面に開口する複
数の貫通孔を設け、挿入ガイド部の端部から吸気できる
ようにしたことにある。上記のように構成した請求項５
の発明においては、空孔内を負圧状態にすることによ
り、拡径されたゴムホース素材の径が自動的に是正され
るので、ゴムホース素材のマンドレルへの差込み作業が
さらに容易にされる。According to a fifth aspect of the present invention, in the mandrel according to the fourth aspect, a hole is provided in a portion extending from the insertion guide portion to at least a part of the small-diameter portion. A plurality of through-holes that open from the holes to the surface of the small-diameter portion are provided so that air can be suctioned from the end of the insertion guide portion. Claim 5 configured as described above.
In the present invention, since the diameter of the rubber hose material whose diameter has been expanded is automatically corrected by setting the inside of the hole to a negative pressure state, the work of inserting the rubber hose material into the mandrel is further facilitated.
【００１１】また、上記請求項６に係る発明の構成上の
特徴は、前記請求項４または請求項５に記載のマンドレ
ルにおいて、大径部を、小径部の端部に着脱可能に取り
付けたことにある。上記のように請求項６に係る発明を
構成したことにより、ゴムホース素材の加硫成形後のゴ
ムホースの抜取り時に、ゴムホースの小径部をマンドレ
ルの先端側の大径部を通過させなくても良いので、引き
抜き作業をさらに容易にすることができる。According to a sixth aspect of the present invention, in the mandrel according to the fourth or fifth aspect, the large diameter portion is detachably attached to the end of the small diameter portion. It is in. Since the invention according to claim 6 is configured as described above, the small diameter portion of the rubber hose does not have to pass through the large diameter portion on the tip side of the mandrel when the rubber hose is extracted after vulcanization molding of the rubber hose material. In addition, the drawing operation can be further facilitated.
【００１２】[0012]
【発明の実施の形態】以下、本発明の一実施の形態を図
面を用いて説明すると、図１は、同実施形態である両端
拡径ゴムホースの製造に用いられるマンドレルを正面図
により示したものである。マンドレル１０は、加硫装置
への固定用のバイス部１１と、バイス部１１から軸方向
に突出し中間に曲り部を有する丸棒形状のマンドレル本
体１２とを備えている。マンドレル本体１２は、バイス
部１１側から順に、円柱形の大径端部１３と、大径端部
１３に連結され先端に向けて縮径された円錐台部１４
と、これに連結され中間位置で折り曲げられた小径部１
５と、小径部１５に連結され先端に向けて拡径された円
錐台部１６と、これに連結された大径部１７を設けてい
る。そして、大径部１７には、先端に向けて縮径された
円錐台形の挿入ガイド部１８が一体で設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a mandrel used for manufacturing a rubber hose having a double-ended diameter according to the embodiment. It is. The mandrel 10 includes a vise portion 11 for fixing to a vulcanizing apparatus, and a round bar-shaped mandrel main body 12 that protrudes in the axial direction from the vise portion 11 and has a curved portion in the middle. The mandrel main body 12 includes a cylindrical large-diameter end 13 and a truncated conical portion 14 connected to the large-diameter end 13 and reduced in diameter toward the tip in order from the vise portion 11 side.
And a small-diameter portion 1 connected thereto and bent at an intermediate position.
5, a truncated cone 16 connected to the small diameter portion 15 and expanded toward the tip, and a large diameter portion 17 connected thereto. The large diameter portion 17 is integrally provided with a frusto-conical insertion guide portion 18 whose diameter is reduced toward the distal end.
【００１３】つぎに、上記マンドレル１０を用いたゴム
ホースの製造方法の一例について説明する。上記小径部
１５の径と略同一の内径の未加硫または半加硫状態のゴ
ムホース素材２０ａが押し出し成形により形成され、切
断工程にて所望長さに切断される。このゴムホース素材
２０ａに離型剤を塗布して、その一端側をマンドレル１
０の挿入ガイド部１８から差し込む。挿入ガイド部１８
は、先端が縮径され徐々に大径にされているので、ゴム
ホース素材２０ａは挿入ガイド部１８に沿ってスムーズ
に大径部１７に挿入される。さらに、大径部１７を通過
し、円錐台部１６、小径部１５、円錐台部１４及び大径
端部１３を経て、バイス部１１の根元にまで円滑に差し
込まれる。Next, an example of a method for manufacturing a rubber hose using the mandrel 10 will be described. An unvulcanized or semi-vulcanized rubber hose material 20a having an inner diameter substantially equal to the diameter of the small diameter portion 15 is formed by extrusion molding, and is cut to a desired length in a cutting step. A release agent is applied to the rubber hose material 20a, and one end of the release agent is applied to the mandrel 1.
0 from the insertion guide portion 18. Insertion guide part 18
The rubber hose material 20a is smoothly inserted into the large-diameter portion 17 along the insertion guide portion 18 since the tip is reduced in diameter and gradually increased in diameter. Further, it passes through the large diameter portion 17, passes through the truncated cone portion 16, the small diameter portion 15, the truncated cone portion 14, and the large diameter end portion 13, and is smoothly inserted into the base of the vise portion 11.
【００１４】ここで、大径部１７の通過によりゴムホー
ス素材２０ａがわずかに拡径されるが、ゴムホース素材
２０ａの大径端部１３側を押さえて、小径部１５に位置
するゴムホース素材２０ａを手で押さえながら円錐台部
１４側から円錐台部１６側まで小径部１５に押し付けて
なじませる。これにより、ゴムホース素材２０ａは小径
部１５に押し付けられて、わずかな拡径部分が元の径に
戻され、図２に示すように、ゴムホース素材２０ａは所
望形状でマンドレル１０に差し込まれる。この状態で、
ゴムホース素材２０ａの加硫成形を行い、加硫成形終了
後に、マンドレル１０から抜き取ることにより、両端側
が拡径されたゴムホース２０が得られる。Here, the rubber hose material 20a is slightly enlarged by passing through the large-diameter portion 17, but the large-diameter end portion 13 of the rubber hose material 20a is pressed and the rubber hose material 20a located at the small-diameter portion 15 is manually moved. While pressing, the small diameter portion 15 is pressed from the truncated cone portion 14 side to the truncated cone portion 16 side to be blended. As a result, the rubber hose material 20a is pressed against the small diameter portion 15, and the slightly enlarged portion is returned to the original diameter. As shown in FIG. 2, the rubber hose material 20a is inserted into the mandrel 10 in a desired shape. In this state,
The rubber hose material 20a is subjected to vulcanization molding, and after the vulcanization molding is completed, the rubber hose 20 is extracted from the mandrel 10 to obtain the rubber hose 20 whose both ends are enlarged in diameter.
【００１５】以上に説明したように、上記実施形態にお
いては、マンドレル１０の先端に設けた挿入ガイド部１
８により、ゴムホース素材２０ａをマンドレルに容易に
差し込むことができる。その結果、両端に拡径部を設け
たゴムホースを、簡易な作業により安価に製造すること
ができる。As described above, in the above embodiment, the insertion guide portion 1 provided at the tip of the mandrel 10 is provided.
8, the rubber hose material 20a can be easily inserted into the mandrel. As a result, a rubber hose having enlarged diameter portions at both ends can be manufactured at a low cost by a simple operation.
【００１６】つぎに、第２の実施形態について説明す
る。本実施形態においては、マンドレル１０の外形は、
上記第１実施形態に示したものと同様であるが、図３に
示すように、挿入ガイド部１８の先端側から、大径部１
７、円錐台部１６及び小径部１５のほぼ円錐台部１４側
までの部分に、軸心位置に空孔である中心孔３０を設け
た。さらに、小径部１５のほぼ全体に、中心孔３０から
貫通する多数の貫通孔３１を分散して設けた。Next, a second embodiment will be described. In the present embodiment, the outer shape of the mandrel 10 is
It is the same as that shown in the first embodiment, but as shown in FIG.
7. A central hole 30, which is a hole, is provided at the position of the axial center at a portion of the truncated cone portion 16 and the small diameter portion 15 substantially up to the truncated cone portion 14 side. Further, a large number of through-holes 31 penetrating from the center hole 30 are provided on almost the entire small diameter portion 15 in a dispersed manner.
【００１７】そして、マンドレル１０にゴムホース素材
２０ａを差し込んだ後、挿入ガイド部１８の先端から、
真空ポンプ等の吸気装置（図示しない）により空気を吸
引し、中心孔３０内を負圧状態にする。それにより、大
径部１７を通過することによりわずかに拡径されたまま
のゴムホース素材２０ａと、小径部１５との間の空気が
貫通孔３１を通して吸引される。そのため、わずかに拡
径されたゴムホース素材２０ａが引っ張られて小径部１
５に密着し、拡径状態が是正されて所定の内径に自動的
に戻される。その結果、拡径されたゴムホース素材２０
ａの径が自動的に是正されるので、ゴムホース素材２０
ａのマンドレル１０への差込み作業がさらに容易にされ
る。After the rubber hose material 20a is inserted into the mandrel 10, the tip of the insertion guide 18 is
Air is suctioned by a suction device (not shown) such as a vacuum pump, and the inside of the center hole 30 is brought into a negative pressure state. As a result, the air between the rubber hose material 20 a, which has been slightly expanded by passing through the large diameter portion 17, and the small diameter portion 15 is sucked through the through-hole 31. Therefore, the slightly expanded rubber hose material 20a is pulled and the small diameter portion 1 is pulled.
5 and is automatically returned to a predetermined inner diameter by correcting the expanded state. As a result, the expanded rubber hose material 20
Since the diameter of a is automatically corrected, the rubber hose material 20
The work of inserting a into the mandrel 10 is further facilitated.
【００１８】つぎに、第３の実施形態について説明す
る。本実施形態においては、マンドレル１０の外形は、
上記第１実施形態に示したものと同様であるが、図４に
示すように、一体で形成された挿入ガイド部１８、大径
部１７及び円錐台部１６を、小径部１５に着脱可能に取
り付けるようにしたものである。すなわち、円錐台部１
６の端面に係合凸部１６ａ（または、係合凹部）を設
け、小径部１５の対応位置に係合凹部１５ａ（または、
係合凸部）を設け、これにより円錐台部１６を小径部１
５に着脱可能にした。Next, a third embodiment will be described. In the present embodiment, the outer shape of the mandrel 10 is
4 is the same as that shown in the first embodiment, but as shown in FIG. 4, the integrally formed insertion guide portion 18, large-diameter portion 17 and frustoconical portion 16 can be detachably attached to the small-diameter portion 15. It is designed to be attached. That is, the truncated cone part 1
6 is provided with an engagement protrusion 16a (or an engagement recess) on an end face thereof, and an engagement recess 15a (or an engagement recess) is provided at a position corresponding to the small diameter portion 15.
Engagement convex portion), so that the truncated cone portion 16 is
5 made detachable.
【００１９】これにより、マンドレル１０に差込まれた
ゴムホース素材の加硫成形が終了した後、一体部分を取
り外すことにより、ゴムホース２０をマンドレルから抜
き取るときに、ゴムホース２０の小径部をマンドレル１
０の大径部１７を通過させなくても良いので、ゴムホー
スの引き抜き作業を非常に簡単にすることができる。ま
た、ゴムホースに無用の変形をもたらすことがなく、そ
の品質を損なうこともない。Thus, after the vulcanization molding of the rubber hose material inserted into the mandrel 10 is completed, by removing the integral part, when the rubber hose 20 is pulled out from the mandrel, the small diameter portion of the rubber hose 20 can be removed from the mandrel 1.
Since it is not necessary to pass through the large-diameter portion 17 of 0, the operation of pulling out the rubber hose can be extremely simplified. Further, the rubber hose is not deformed unnecessarily and its quality is not deteriorated.
【００２０】なお、ゴムホース２０の小径部と両端拡径
部の内径をｒa ，ｒb （ｒa ＜ｒb）とし、下記数１に
定義する異径率δを考慮した場合、本発明の適用の目安
としては、異径率δが４０％以下であることが望まし
い。When the inner diameter of the small diameter portion and the enlarged diameter portion at both ends of the rubber hose 20 is defined as ra, rb (ra <rb) and the different diameter ratio δ defined in the following equation 1 is taken into consideration, the application of the present invention is a standard. It is preferable that the different diameter ratio δ is 40% or less.
【００２１】[0021]
【数１】 δ＝（ｒb ／ｒa −１）×１００## EQU1 ## δ = (rb / ra-1) × 100
【００２２】また、本発明において、ゴムホースとして
は、曲がり形状でもストレートでもよく、また補強層の
有無にも関わらないものである。In the present invention, the rubber hose may have a bent shape or a straight shape, and does not depend on the presence or absence of a reinforcing layer.
【図１】本発明の第１の実施形態である両端拡径ゴムホ
ースの製造に用いられるマンドレルを概略的に示す正面
図である。FIG. 1 is a front view schematically showing a mandrel used for manufacturing a rubber hose having both ends enlarged according to a first embodiment of the present invention.
【図２】同マンドレルにゴムホース素材を差し込んだ状
態を示す一部破断面図である。FIG. 2 is a partially broken sectional view showing a state in which a rubber hose material is inserted into the mandrel.
【図３】第２の実施形態であるマンドレルを概略的に示
す正面図である。FIG. 3 is a front view schematically showing a mandrel according to a second embodiment.
【図４】第３の実施形態であるマンドレルを概略的に示
す正面図である。FIG. 4 is a front view schematically showing a mandrel according to a third embodiment.
【図５】従来例であるマンドレルを概略的に示す正面図
である。FIG. 5 is a front view schematically showing a conventional mandrel.
１０…マンドレル、１１…バイス部、１２…マンドレル
本体、１３…大径端部、１４…円錐台部、１５…小径
部、１６…円錐台部、１７…大径部、１８…挿入ガイド
部、２０…ゴムホース、２０ａ…ゴムホース素材、３０
…中心孔、３１…貫通孔。DESCRIPTION OF SYMBOLS 10 ... Mandrel, 11 ... Vise part, 12 ... Mandrel main body, 13 ... Large diameter end part, 14 ... Truncated cone part, 15 ... Small diameter part, 16 ... Truncated cone part, 17 ... Large diameter part, 18 ... Insertion guide part, 20: rubber hose, 20a: rubber hose material, 30
... Center hole, 31 ... Through hole.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｌ 23:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B29L 23:00
Claims (6)
部と、中間の小径部と、先端側の大径部とを設けると共
に、同大径部に先端に向けて縮径された円錐台形の挿入
ガイド部を取り付けてなるマンドレルを用い、前記小径
部と略等しい内径の未加硫または半加硫のゴムホース素
材を前記挿入ガイド部から外挿して前記マンドレルの固
定部の根元に当接するまで差込んで固定した後、この状
態で同ゴムホース素材を加硫するようにしたことを特徴
とするゴムホースの製造方法。1. A large-diameter end portion, an intermediate small-diameter portion, and a large-diameter portion on the distal end side are provided continuously and coaxially from a fixed portion, and the diameter of the large-diameter portion is reduced toward the distal end. Using a mandrel to which a frustoconical insertion guide is attached, an unvulcanized or semi-vulcanized rubber hose material having an inner diameter substantially equal to the small diameter portion is extrapolated from the insertion guide portion to the base of the fixed portion of the mandrel. A method for manufacturing a rubber hose, wherein the rubber hose material is vulcanized in this state after being inserted and fixed until it abuts.
方法において、前記挿入ガイド部の先端から前記小径部
の少なくとも一部に至る部分に空孔を設けると共に、同
空孔から前記小径部の表面に開口する複数の貫通孔を設
け、前記マンドレルに前記ゴムホース素材を差し込んだ
状態で、前記挿入ガイド部の端部から吸気して、前記空
孔内を負圧状態にすることを特徴とするゴムホースの製
造方法。2. The method for manufacturing a rubber hose according to claim 1, wherein a hole is provided in a portion extending from a tip of the insertion guide portion to at least a part of the small diameter portion, and a hole is formed from the hole to the small diameter portion. A plurality of through-holes are provided on the surface, and in a state in which the rubber hose material is inserted into the mandrel, air is suctioned from an end of the insertion guide portion to make the inside of the hole a negative pressure state. Manufacturing method of rubber hose.
ムホースの製造方法において、前記大径部を、前記小径
部の端部に着脱可能に取り付けたことを特徴とするゴム
ホースの製造方法。3. The method of manufacturing a rubber hose according to claim 1, wherein the large diameter portion is detachably attached to an end of the small diameter portion.
外挿されるマンドレルであって、固定部から連続してか
つ同軸的に、大径端部と、中間の小径部と、先端側の大
径部とを設けると共に、同大径部に先端に向けて縮径さ
れた円錐台形の挿入ガイド部を取り付けてなることを特
徴とするマンドレル。4. A mandrel into which an unvulcanized or semi-vulcanized rubber hose material is extrapolated, and continuously and coaxially from a fixed portion, a large-diameter end portion, an intermediate small-diameter portion, and a distal end side. A mandrel comprising: a large diameter portion; and a frustoconical insertion guide portion reduced in diameter toward a tip is attached to the large diameter portion.
て、前記挿入ガイド部から前記小径部の少なくとも一部
に至る部分に空孔を設けると共に、同空孔から前記小径
部の表面に開口する複数の貫通孔を設け、前記挿入ガイ
ド部の端部から吸気できるようにしたことを特徴とする
マンドレル。5. The mandrel according to claim 4, wherein a hole is provided in a portion extending from the insertion guide portion to at least a part of the small diameter portion, and a plurality of holes are opened from the hole to the surface of the small diameter portion. A mandrel characterized in that a through hole is provided so that air can be taken in from the end of the insertion guide portion.
ンドレルにおいて、前記大径部を、前記小径部の端部に
着脱可能に取り付けたことを特徴とするマンドレル。6. The mandrel according to claim 4, wherein the large-diameter portion is detachably attached to an end of the small-diameter portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7938297A JP3525675B2 (en) | 1997-03-31 | 1997-03-31 | Method for producing rubber hose and mandrel used for the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7938297A JP3525675B2 (en) | 1997-03-31 | 1997-03-31 | Method for producing rubber hose and mandrel used for the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10272633A true JPH10272633A (en) | 1998-10-13 |
| JP3525675B2 JP3525675B2 (en) | 2004-05-10 |
Family
ID=13688330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7938297A Expired - Fee Related JP3525675B2 (en) | 1997-03-31 | 1997-03-31 | Method for producing rubber hose and mandrel used for the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3525675B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009174696A (en) * | 2007-03-23 | 2009-08-06 | Tokai Rubber Ind Ltd | Fuel hose |
-
1997
- 1997-03-31 JP JP7938297A patent/JP3525675B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009174696A (en) * | 2007-03-23 | 2009-08-06 | Tokai Rubber Ind Ltd | Fuel hose |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3525675B2 (en) | 2004-05-10 |
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