JP2005059347A - Resin or rubber mandrel for manufacturing hose - Google Patents
Resin or rubber mandrel for manufacturing hose Download PDFInfo
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- JP2005059347A JP2005059347A JP2003291496A JP2003291496A JP2005059347A JP 2005059347 A JP2005059347 A JP 2005059347A JP 2003291496 A JP2003291496 A JP 2003291496A JP 2003291496 A JP2003291496 A JP 2003291496A JP 2005059347 A JP2005059347 A JP 2005059347A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 45
- 229920005989 resin Polymers 0.000 title claims abstract description 45
- 239000011347 resin Substances 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 16
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 13
- 229920001225 polyester resin Polymers 0.000 claims description 5
- 239000004645 polyester resin Substances 0.000 claims description 5
- 229920006122 polyamide resin Polymers 0.000 claims description 4
- 229920000306 polymethylpentene Polymers 0.000 claims description 4
- 239000011116 polymethylpentene Substances 0.000 claims description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 1
- 239000005977 Ethylene Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 2
- 239000006082 mold release agent Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000000605 extraction Methods 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 230000006872 improvement Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 229920000571 Nylon 11 Polymers 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- -1 polybutylene terephthalate Polymers 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
本発明は、ブレーキ用ゴムホース等の各種ホースを製造する際にコア型として用いるホース製造用樹脂又はゴムマンドレルに係り、より詳しくは、ゴムホースから容易に抜き取ることができるブロー性に優れたホース製造用樹脂又はゴムマンドレルに関するものである。 The present invention relates to a hose manufacturing resin or rubber mandrel used as a core mold when manufacturing various hoses such as a rubber hose for brakes, and more specifically, for manufacturing a hose excellent in blowability that can be easily pulled out from a rubber hose. It relates to a resin or rubber mandrel.
長尺のゴムホースを製造するに際しては、通常、シリコン系やフッ素系化合物等の離型剤を表面に塗布したマンドレル上に、未加硫のゴム組成物を押出してホース内管を形成し、このホース内管上に編組機を用いてワイヤや有機繊維からなる補強層を形成する。そして、この補強層上に未加硫の外管用のゴム組成物を押出して加硫した後、ホースの片方の端部に水圧をかけてマンドレルを抜き取っている。しかし、このマンドレルの抜き取り作業には、数分から１０分程度の時間と手間を要し、また、多量の離型剤を使用しなければならないためにコストが増えるとともに、その塗布作業や、マンドレル抜き取り後に残存・付着した離型剤の除去作業も必要になるなどの問題を抱えていた。
一方、この長尺のゴムホース製造用の樹脂又はゴムマンドレル（以下、単にマンドレルと略称する場合がある）としては、従来からナイロンに代表されるポリアミド、ポリエステル等の熱可塑性樹脂が多用されていた。
When manufacturing a long rubber hose, an unvulcanized rubber composition is usually extruded onto a mandrel having a release agent such as a silicon-based or fluorine-based compound applied to the surface, and an inner tube of the hose is formed. A reinforcing layer made of wire or organic fiber is formed on the inner tube of the hose using a braiding machine. And after extruding and vulcanizing the rubber composition for an unvulcanized outer tube on this reinforcement layer, water pressure is applied to one end of a hose, and a mandrel is extracted. However, this mandrel extraction operation takes time and labor of several minutes to 10 minutes, and since a large amount of release agent must be used, the cost increases and the application operation and mandrel extraction operation There were problems such as the need to remove the remaining and adhered release agent later.
On the other hand, as the resin or rubber mandrel for producing this long rubber hose (hereinafter sometimes simply referred to as “mandrel”), thermoplastic resins such as polyamide and polyester typified by nylon have been frequently used.
ナイロン樹脂のマンドレルの場合には、長尺ホースを製造する際に、製造するホースの長さに合わせて切断した後に、再度溶着させて何度も使用することができ、寿命が長いという利点がある。しかしながら、このマンドレルの場合には、特にホース内からの引き抜きが困難（ブロー性が悪い）であるという問題があるのに加えて、マンドレル引き抜き時に、マンドレルとホース内管との摩擦抵抗により、マンドレルの表面層の一部が剥離し、剥離したマンドレルの表面層がホース内管に付着するという問題があった。 In the case of a nylon resin mandrel, when manufacturing a long hose, it can be cut again according to the length of the hose to be manufactured, and then welded again and used many times. is there. However, in the case of this mandrel, there is a problem that it is difficult to pull out from the inside of the hose (poor blowability), and in addition, when the mandrel is pulled out, due to the frictional resistance between the mandrel and the inner tube of the hose, the mandrel There was a problem that a part of the surface layer peeled off and the peeled surface layer of the mandrel adhered to the hose inner tube.
一方、ポリエステル樹脂のマンドレルはナイロン製マンドレルよりブロー性に優れており、また溶着させて複数回使用することができるという利点もある。しかしながら、マンドレル抜き時にマンドレルとホース内管との摩擦抵抗により、マンドレル表面層の一部が剥離するという問題があった。 On the other hand, a mandrel of a polyester resin is superior in blowability to a nylon mandrel, and has an advantage that it can be used multiple times after being welded. However, there is a problem that a part of the mandrel surface layer is peeled off due to the frictional resistance between the mandrel and the hose inner tube when the mandrel is removed.
このような問題を無くするために、従来から種々の提案がなされている。例えば、ブロー性、耐表面層剥離性が優れ、溶着により複数回の使用が可能であり、小径ホースの製造にも使用し得るようにしたマンドレルがある。
これは、少なくともポリエステルエラストマーとポリブチレンテレフタート樹脂（ＰＢＴ樹脂）の重量和に対して、前記ポリブチレンテレフタート樹脂の配合割合を５５〜９５重量％とし、ポリエステルエラストマーのショアＤ硬度を５５〜７２Ｄとしたものである（例えば、特許文献１参照）。
In order to eliminate such a problem, various proposals have been conventionally made. For example, there is a mandrel that is excellent in blowability and surface layer peeling resistance, can be used multiple times by welding, and can also be used in the manufacture of small diameter hoses.
This is because the blending ratio of the polybutylene terephthalate resin is 55 to 95% by weight with respect to the total weight of the polyester elastomer and the polybutylene terephthalate resin (PBT resin), and the Shore D hardness of the polyester elastomer is 55 to 72D. (For example, see Patent Document 1).
また、マンドレルの原料となるポリエステル樹脂、ポリアミド樹脂、４−ポリメチルペンテン樹脂等に、所定粒度範囲の無機物の粉末を混合すると共に混練し、表面を梨地状にすることにより、ブロー性を向上させるようにしたマンドレルがある（例えば、特許文献２参照。）。この特許文献２に開示されたマンドレルは、具体的には上記樹脂にマンドレルの耐熱性、耐熱変形性等を損なわない酸化アルミニウムや炭酸カルシウムの粉末を、マンドレル構成材料を基準（１００）として２〜２５重量％の範囲で混合すると共に混練し、表面を梨地状にしたもので、これにより、マンドレルの表面とホース内管との間に水が侵入し易くなるため、ブロー性が向上するとともに表面が梨地状であるのにも拘わらず、ホース内管の内表面の精度が損なわれるようなことがなく、製品として望ましい内面粗さのホースを得ることができると記載されている。 In addition, the polyester resin, polyamide resin, 4-polymethylpentene resin, etc., which are the mandrel raw materials, are mixed with an inorganic powder in a predetermined particle size range and kneaded to improve the blowability by making the surface textured. There is such a mandrel (see, for example, Patent Document 2). Specifically, the mandrel disclosed in Patent Document 2 is a powder of aluminum oxide or calcium carbonate that does not impair the heat resistance, heat distortion resistance, etc. of the mandrel in the resin, and the mandrel constituent material is 2 to 2 as a reference (100). Mixing and kneading in the range of 25% by weight, and the surface is made into a satin-like surface. This makes it easier for water to enter between the surface of the mandrel and the hose inner tube, improving the blowability and the surface. However, it is described that a hose having an inner surface roughness desirable as a product can be obtained without impairing the accuracy of the inner surface of the inner tube of the hose.
上記特許文献１に記載のマンドレルによれば、表面層の剥離がないのでホースの品質に悪影響を及ぼすことがなく、またマンドレルのブロー性もある程度は改善されている。しかしながら、マンドレルのブロー性に関しては、未だ十分とはいえないと考えられる。即ち、上記特許文献１に記載のマンドレルでは、長さ２００ｍ、直径６ｍｍである場合のブロー時間は３分（特許文献１の表１参照）を要している。 According to the mandrel described in Patent Document 1, there is no peeling of the surface layer, so that the quality of the hose is not adversely affected, and the blowability of the mandrel is improved to some extent. However, the blowability of the mandrel is still not considered sufficient. That is, in the mandrel described in Patent Document 1, the blow time when the length is 200 m and the diameter is 6 mm requires 3 minutes (see Table 1 of Patent Document 1).
また、上記特許文献２に記載のマンドレルでは、ブロー性が向上すると表明しながらもこれについての具体的なデータは一切記載されていない。しかも、この特許文献２は、最終的に審査が請求されず、取下げられている。これらの点を考慮すると、現実には、ブロー性に関して少なくとも十分な改善効果も得られず、その実用化を断念したものと推定される
これら従来技術において提案されるマンドレルが上記のように、ブロー性が何れも不十分であり、ホースの生産性の向上、生産コストの削減に実質的に寄与することができないものと想定される。
Moreover, in the mandrel described in Patent Document 2, although it is stated that the blowability is improved, no specific data on this is described. Moreover, this Patent Document 2 is finally withdrawn without being requested for examination. Considering these points, in reality, at least a sufficient improvement effect on blowability cannot be obtained, and it is presumed that the practical application has been abandoned. It is assumed that all of these properties are insufficient and cannot substantially contribute to improvement of hose productivity and reduction of production cost.
従って、本発明の目的は、上述した従来の問題点を確実に解決し、多量の離型剤を使用しなくとも、ブロー性が優れ、ホースの生産性の向上、ならびに生産コストの削減に実質的に寄与することを可能ならしめるホース製造用樹脂又はゴムマンドレルを提供することにある。 Therefore, the object of the present invention is to reliably solve the above-mentioned conventional problems and to improve the blowability, improve the hose productivity, and reduce the production cost without using a large amount of release agent. It is an object of the present invention to provide a resin or rubber mandrel for manufacturing a hose that makes it possible to make a contribution.
発明者らは、鋭意研究・実験を続けた結果、特定の粉末を樹脂材料（又はゴム材料）に適量混合して成形して得たマンドレルを使用すると、その引き抜き時にゴムホースとの摺動性が向上し、ブロー性が大幅に改善される事実を知見して本発明をなしたものである。 As a result of continual research and experiments, the inventors have used a mandrel obtained by mixing an appropriate amount of a specific powder with a resin material (or rubber material) and molding it. The present invention has been made based on the fact that the improvement and blowability are greatly improved.
従って上記課題を解決するために、本発明の請求項１に係るホース製造用樹脂又はゴムマンドレルが採用した手段の特徴とするところは、マンドレル製造用の樹脂又はゴム材料中に、グラファイト粉末を１０質量％以下含有させて成形したところにある。 Therefore, in order to solve the above-mentioned problem, the means adopted by the resin or rubber mandrel for producing a hose according to claim 1 of the present invention is characterized in that 10 graphite powder is contained in the resin or rubber material for producing the mandrel. It is in the place where it is contained by mass% or less.
本発明の請求項２に係るホース製造用樹脂又はゴムマンドレルが採用した手段の特徴とするところは、マンドレル製造用の樹脂又はゴム材料中に、グラファイト粉末を１〜７質量％含有させて成形したところにある。 The feature of the means employed by the resin or rubber mandrel for producing the hose according to claim 2 of the present invention is that the resin or rubber material for producing the mandrel is molded by containing 1 to 7% by mass of graphite powder. By the way.
本発明の請求項３に係るホース製造用樹脂又はゴムマンドレルが採用した手段の特徴とするところは、マンドレル製造用の樹脂又はゴム材料中に、二硫化モリブデン粉末を２０質量％以下含有させて成形したところにある。 The feature of the means employed by the resin or rubber mandrel for producing a hose according to claim 3 of the present invention is that the resin or rubber material for producing a mandrel is molded by containing 20% by mass or less of molybdenum disulfide powder. There is.
本発明の請求項４に係るホース製造用樹脂又はゴムマンドレルが採用した手段の特徴とするところは、マンドレル製造用の樹脂又はゴム材料中に、二硫化モリブデン粉末を１〜１５質量％含有させて成形したところにある。 The feature of the means adopted by the resin or rubber mandrel for producing a hose according to claim 4 of the present invention is that the resin or rubber material for producing a mandrel contains 1 to 15% by mass of molybdenum disulfide powder. It is in the place where it was molded.
本発明の請求項５に係るホース製造用マンドレルが採用した手段の特徴とするところは、請求項１〜４のうちの何れか一つの項に記載のホース製造用マンドレルにおいて、前記樹脂又はゴム材料が、ポリアミド樹脂、ポリエステル樹脂、フッ素樹脂、4−ポリメチルペンテン樹脂又はエチレンプロピレン系ゴム、フッ素系ゴムであるところにある。 The feature adopted by the mandrel for manufacturing a hose according to claim 5 of the present invention is the mandrel for manufacturing a hose according to any one of claims 1 to 4, wherein the resin or rubber material is used. Is a polyamide resin, a polyester resin, a fluororesin, a 4-polymethylpentene resin, an ethylene propylene rubber, or a fluororubber.
上記本発明によれば従来よりも遥かにブロー性に優れた各種のホース製造用の樹脂又はゴムマンドレルを提供することが可能となり、従って高価な離型剤の多量使用を必要とせずに、非常に短時間でマンドレルの抜き取り作業を終えることができ、このためホースの生産性の向上、ならびにホースの製造コストの低減に対して大いに寄与することができるという優れた効果を得ることができる。 According to the present invention, it becomes possible to provide various types of resins or rubber mandrels for producing hoses that are much more excellent in blowability than conventional ones. Therefore, without using a large amount of expensive release agent, The mandrel extraction operation can be completed in a short time, and therefore, the excellent effect of greatly contributing to the improvement of the hose productivity and the reduction of the manufacturing cost of the hose can be obtained.
以下、本発明の実施の形態１に係るホース製造用マンドレルの構成について説明する。即ち、本発明の実施の形態１に係るホース製造用マンドレルは、マンドレル製造用の熱可塑性樹脂（ポリアミド樹脂、ポリエステル樹脂、フッ素樹脂又は4−ポリメチルペンテン樹脂など）材料中に又はゴム（エチレンプロピレン系ゴム、フッ素系ゴムなど）材料中に１０質量％以下好ましくは１〜７％のグラファイト粉末を含有させて、これらを混練して、スクリュウにより押出し成形されたものである。また、樹脂又はゴム材料中に含有されるグラファイト粉末は１００μｍ以下の粒度範囲のものを選択することが好ましい。 Hereinafter, the configuration of the mandrel for manufacturing a hose according to the first embodiment of the present invention will be described. That is, the mandrel for manufacturing a hose according to Embodiment 1 of the present invention is made of a thermoplastic resin (polyamide resin, polyester resin, fluororesin or 4-polymethylpentene resin) for manufacturing a mandrel or rubber (ethylene propylene). (Based rubber, fluorine rubber, etc.) The material is made to contain 10% by mass or less, preferably 1 to 7% of graphite powder, kneaded, and extruded by a screw. The graphite powder contained in the resin or rubber material is preferably selected to have a particle size range of 100 μm or less.
そして、本発明の実施の形態１に係るホース製造用マンドレルにおいて、樹脂又はゴム中へのグラファイト粉末の好ましい含有量を１〜７質量％としたのは、マンドレルのブロー性、およびマンドレルの伸び量を勘案して決定したものである。すなわち、グラファイト粉末の含有量が１質量％未満であると、ブロー性の改善効果が少なく、伸び量が多くなるため、製造するホースの内径変化が許容範囲を超える可能性が出てくるからである。そして、グラファイト粉末の含有量が７質量％を越えると、ブロー性がサチュレートして含有量の増加に対応して向上しないのに加えて、マンドレルの硬度が高くなり、その耐久性が低下し、さらに１０質量％を越えると折損し易くなるからである。 And in the mandrel for manufacturing a hose according to Embodiment 1 of the present invention, the preferable content of the graphite powder in the resin or rubber is 1 to 7% by mass because the blowability of the mandrel and the elongation of the mandrel Is determined in consideration of In other words, if the content of the graphite powder is less than 1% by mass, the effect of improving the blowability is small and the amount of elongation increases, so that the change in the inner diameter of the hose to be manufactured may exceed the allowable range. is there. And when the content of the graphite powder exceeds 7% by mass, the blowability saturates and does not improve corresponding to the increase in the content, in addition, the hardness of the mandrel increases, and its durability decreases, It is because it will become easy to break when it exceeds 10 mass%.
次に、本発明の実施の形態２に係るホース製造用マンドレルの構成について説明する。即ち、本発明の実施の形態２に係るホース製造用樹脂又はゴムマンドレルは、マンドレル製造用の熱可塑性樹脂又はゴム材料中に、２０質量％以下好ましくは１〜１５％の二硫化モリブデン粉末を含有させて、同様にしてこれらを混練して、スクリュウにより押出し成形されたものである。また、材料中に含有される二硫化モリブデン粉末は前記グラファイトの場合と同様１００μｍ以下の粒度範囲のものを選択することが好ましい。 Next, the structure of the mandrel for manufacturing a hose according to the second embodiment of the present invention will be described. That is, the resin or rubber mandrel for producing a hose according to Embodiment 2 of the present invention contains 20% by mass or less, preferably 1 to 15% of molybdenum disulfide powder in the thermoplastic resin or rubber material for producing the mandrel. In the same manner, these are kneaded and extruded by a screw. Further, the molybdenum disulfide powder contained in the material is preferably selected to have a particle size range of 100 μm or less as in the case of the graphite.
本発明の実施の形態２に係るホース製造用マンドレルにおいて、材料中への二硫化モリブデン粉末の好ましい含有量を１〜１５質量％としたのは、やはり実施の形態１と同様に、マンドレルのブロー性、およびマンドレルの伸び量に基づいて限定したものである。すなわち、二硫化モリブデン粉末の場合は、その含有量が１質量％未満であると、ブロー性の改善効果が小さく、伸び量が多くなるため、製造するホースの内径変化が許容範囲を超える可能性が出てくるからである。そして、二硫化モリブデン粉末の含有量が１５質量％を越えると、ブロー性がサチュレートして含有量の増加に対応して向上しないのに加えて、マンドレルの硬度が高くなり、その耐久性が低下し、さらに２０質量％を越えると折損し易くなるからである。 In the mandrel for manufacturing a hose according to the second embodiment of the present invention, the preferable content of the molybdenum disulfide powder in the material is 1 to 15% by mass, as in the first embodiment. Limited based on the properties and the amount of mandrel elongation. That is, in the case of molybdenum disulfide powder, if the content is less than 1% by mass, the effect of improving blowability is small and the amount of elongation increases, so the inner diameter change of the hose to be manufactured may exceed the allowable range. Because it comes out. And if the content of molybdenum disulfide powder exceeds 15% by mass, the blowability will saturate and will not improve corresponding to the increase in content, but the hardness of the mandrel will increase and its durability will decrease. And if it exceeds 20 mass%, it will become easy to break.
これらグラファイト粉末及び二硫化モリブデン粉末を材料中に適量含有させたマンドレルが後述の実施例でも明かなように大幅にブロー性を向上させることができる。ところで、グラファイト等が滑性に有していることはすでに知られている。しかし、この単独の性質から、本発明のごとくマンドレルの配合成分として適用した場合、特に数パーセントレベルの少量の存在下でブロー性の顕著な改善を直ちに予測することは困難である。 A mandrel in which appropriate amounts of these graphite powder and molybdenum disulfide powder are contained in the material can greatly improve the blowability as will be apparent from the examples described later. By the way, it is already known that graphite or the like has slipperiness. However, this single property makes it difficult to immediately predict a significant improvement in blowability when applied as a mandrel compounding ingredient as in the present invention, especially in the presence of small amounts of several percent levels.
そこで、発明者らは、ブロー性の改善の理由を究明すべく、通常のナイロン１１製の樹脂マンドレル（従来マンドレル）と、このナイロン１１に８０μｍ以下のグラファイト粉末を７％含有させた樹脂マンドレル（本発明マンドレル）を試料としてその表面状態の調査を実施した。なお、両試料は同一条件でスクリュウ押し出し成形したもので、その寸法はいずれも直径が３．２ｍｍのものである。
図１および図２は両者のマンドレル試料を長さ方向を横にセットしてその表面を顕微鏡（倍率：５００倍）で観察した結果を示す写真である。図１は従来マンドレル、図２は本発明マンドレルを示している。
In order to investigate the reason for improving the blowability, the inventors have made a normal mandrel made of nylon 11 (conventional mandrel) and a resin mandrel containing 7% of graphite powder of 80 μm or less in this nylon 11 ( The surface state of the mandrel was measured. Both samples were extruded by screw extrusion under the same conditions, and both dimensions were 3.2 mm in diameter.
FIG. 1 and FIG. 2 are photographs showing the results of observing the surface of both mandrel samples with a microscope (magnification: 500 times) with the length direction set horizontally. FIG. 1 shows a conventional mandrel, and FIG. 2 shows the mandrel of the present invention.
これらの結果から、まず、図２のグラファイトを含有しない従来のマンドレルではその表面が滑らかでその長さ方向に筋状に配向している様子が伺える。これに対して、グラファイトを混合した本発明マンドレルの表面は、不規則な凹凸模様がその全面に渡って形成されていることが分かり、しかも、図２のような特に目立った配向も見られない。また、その凸部は鋭利な突起状ではなく、比較的なだらかで丸みを帯びた形状を成している様子も知れる。 From these results, it can be seen that the conventional mandrel containing no graphite shown in FIG. 2 has a smooth surface and is linearly oriented in the length direction. On the other hand, the surface of the mandrel of the present invention mixed with graphite is found to have irregular irregular patterns formed over the entire surface, and no particularly noticeable orientation as shown in FIG. 2 is observed. . In addition, it is also known that the convex portion is not a sharp projecting shape but has a comparatively gentle and rounded shape.
このように両者の表面状態の差異から、本発明マンドレルの場合は表面に不規則に形成された多数の凹凸によりマンドレル表面とホース内面との密着を緩和すると共に、高圧で供給された水の一部がこれらの凹凸介して縦横無尽に浸透して濡れ性が改善され、この浸透水の潤滑作用と相俟ってホースからのマンドレルの抜き取りを容易にする働きを大きく担っているものと想定される。勿論、これに加えて表面に点在するグラファイト粒子そのものがせん断力によってそのへき開面に沿って内部滑りを起こし、その抜き取りをさらに助長していることも当然考えられる。以上、グラファイト入りの樹脂マンドレルにおける、ブロー性向上の理由をその表面状態の観察結果をもとに考察したが、二硫化モリブデンについても同等な理由に基づくものと推察される。 As described above, due to the difference in surface condition between the two, in the case of the mandrel of the present invention, the adhesion between the mandrel surface and the hose inner surface is alleviated by a large number of irregularities formed irregularly on the surface, and the water supplied at high pressure is reduced. It is assumed that the wettability is improved by infiltrating all the way through these irregularities and that the wettability is improved, and in combination with the lubrication action of this permeated water, it is assumed that it has a great role in facilitating the extraction of the mandrel from the hose. The Of course, in addition to this, it is naturally conceivable that the graphite particles themselves scattered on the surface cause internal slip along the cleavage plane due to the shearing force, thereby further facilitating the extraction. As described above, the reason for the improvement of the blowability in the resin mandrel containing graphite is considered based on the observation result of the surface state, but it is presumed that the molybdenum disulfide is also based on the same reason.
以下、マンドレルの抜き取り試験（ブロー試験）結果について説明する。即ち、予め樹脂材料中に８０μｍ以下の粒度範囲を有するグラファイト粉末または二硫化モリブデン粉末を添加、混練して押出し成形して得られた、長さ１５０ｍ、直径３．２ｍｍφの各種樹脂マンドレルを用いて、内径３．４ｍｍのブレーキ用のゴムホースを製造した。そして、製造したホースの一端側に２９．４ＭＰａの水圧を掛けて閉塞栓で閉塞した後、予め閉塞栓で閉塞されていたホースの他端側を切断してからマンドレルが抜け出すのに要する時間を測定した。この場合、離型剤は使用しなかった。ブロー性確認試験に用いたマンドレルの試料と測定結果を表１に示す。なお、比較のために、これら粉末を含有しない通常の樹脂マンドレル（No６）についても従来同様に離型剤を塗布してブロー性確認試験を行った。 The results of the mandrel sampling test (blow test) will be described below. That is, using various resin mandrels having a length of 150 m and a diameter of 3.2 mmφ obtained by adding graphite powder or molybdenum disulfide powder having a particle size range of 80 μm or less to a resin material in advance, kneading and extrusion molding. A rubber hose for brakes having an inner diameter of 3.4 mm was manufactured. Then, after applying a water pressure of 29.4 MPa to one end side of the manufactured hose and closing with the closing plug, the time required for the mandrel to come out after cutting the other end side of the hose previously blocked with the closing plug is removed. It was measured. In this case, no release agent was used. Table 1 shows the mandrel samples used in the blowability confirmation test and the measurement results. For comparison, a normal resin mandrel (No. 6) not containing these powders was also subjected to a blowability confirmation test by applying a release agent in the same manner as before.
上記表１のブロー性確認試験結果によれば、試料No13のナイロン１１からなる従来のマンドレル（比較試料）の抜出し所要時間が１〜３分であるのに対して、試料No２〜６は何れのマンドレルも３０秒以下で抜取りが完了しており、ブロー性が極めて優れていることが良く分かる。なお、特許文献１に記載のマンドレルと比較すると、本発明の場合と試験条件（長さ２００ｍ、直径６ｍｍ、水圧２０ＭＰａ）が異なるものの、ブロー時間は３分を要しており、ブロー性は本発明の方が優れていると考えられる。 According to the blowability confirmation test results in Table 1 above, the extraction time required for a conventional mandrel (comparative sample) made of nylon 11 of sample No. 13 is 1 to 3 minutes, while any of samples No. 2 to 6 is The mandrel is also extracted in less than 30 seconds, and it is well understood that the blowability is extremely excellent. Compared with the mandrel described in Patent Document 1, although the test conditions (length 200 m, diameter 6 mm, water pressure 20 MPa) are different from the case of the present invention, the blowing time requires 3 minutes, and the blowing property is The invention is considered superior.
以上では、本発明のマンドレルによりブレーキ用ゴムホースを製造する場合を例として説明した。しかしながら、本発明の技術的思想を、ブレーキ用ホースの製造用マンドレルに限らず、種々のゴムホースを製造するマンドレルに対して適用することができることは言うまでもない。 In the above, the case where the rubber hose for brakes was manufactured with the mandrel of the present invention was described as an example. However, it goes without saying that the technical idea of the present invention can be applied not only to mandrels for manufacturing brake hoses but also to mandrels for manufacturing various rubber hoses.
Claims (5)
The said resin or rubber material is a polyamide resin, a polyester resin, a fluororesin 4-polymethylpentene resin, an ethylene propylene-type rubber, a fluorine-type rubber, The term of any one of Claims 1-4 characterized by the above-mentioned. A resin or rubber mandrel for producing a hose according to 1.
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| JP2003291496A JP4074842B2 (en) | 2003-08-11 | 2003-08-11 | Resin or rubber mandrel for hose manufacture |
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| JP2003291496A JP4074842B2 (en) | 2003-08-11 | 2003-08-11 | Resin or rubber mandrel for hose manufacture |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006305928A (en) * | 2005-04-28 | 2006-11-09 | Mitsubishi Cable Ind Ltd | Mandrel for manufacturing rubber hose |
| JP2010000686A (en) * | 2008-06-20 | 2010-01-07 | Kurabe Ind Co Ltd | Mandrel line for manufacturing hose and its manufacturing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01115510U (en) * | 1988-01-30 | 1989-08-03 | ||
| JPH01247123A (en) * | 1988-03-29 | 1989-10-03 | Ube Ind Ltd | Preparation of hollow product |
| JPH03114722A (en) * | 1989-09-28 | 1991-05-15 | Mitsubishi Cable Ind Ltd | Manufacture for linear long-sized body |
| JPH0631740A (en) * | 1992-07-21 | 1994-02-08 | Tokai Rubber Ind Ltd | Mandrel for manufacture of hose |
| JP2000334748A (en) * | 1999-05-28 | 2000-12-05 | Toyobo Co Ltd | Manufacture of mandrel and high-pressure rubber hose |
-
2003
- 2003-08-11 JP JP2003291496A patent/JP4074842B2/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01115510U (en) * | 1988-01-30 | 1989-08-03 | ||
| JPH01247123A (en) * | 1988-03-29 | 1989-10-03 | Ube Ind Ltd | Preparation of hollow product |
| JPH03114722A (en) * | 1989-09-28 | 1991-05-15 | Mitsubishi Cable Ind Ltd | Manufacture for linear long-sized body |
| JPH0631740A (en) * | 1992-07-21 | 1994-02-08 | Tokai Rubber Ind Ltd | Mandrel for manufacture of hose |
| JP2000334748A (en) * | 1999-05-28 | 2000-12-05 | Toyobo Co Ltd | Manufacture of mandrel and high-pressure rubber hose |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006305928A (en) * | 2005-04-28 | 2006-11-09 | Mitsubishi Cable Ind Ltd | Mandrel for manufacturing rubber hose |
| JP2010000686A (en) * | 2008-06-20 | 2010-01-07 | Kurabe Ind Co Ltd | Mandrel line for manufacturing hose and its manufacturing method |
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