JPS60190311A - Manufacture of frp pipe - Google Patents
Manufacture of frp pipeInfo
- Publication number
- JPS60190311A JPS60190311A JP4792884A JP4792884A JPS60190311A JP S60190311 A JPS60190311 A JP S60190311A JP 4792884 A JP4792884 A JP 4792884A JP 4792884 A JP4792884 A JP 4792884A JP S60190311 A JPS60190311 A JP S60190311A
- Authority
- JP
- Japan
- Prior art keywords
- laminate
- iron core
- resin
- induction coil
- heating
- 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.)
- Pending
Links
Landscapes
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はFRPバイブの製造法に関する。FRPバイブ
は鉄芯に熱硬化性樹脂を用いたプリプレグを巻きつけた
積層物を外部から加熱して硬化させるか又は鉄芯に補強
材を巻きつけてから熱硬化性樹脂を真空含浸してから外
部から加熱硬化して製造するのが普通である。このよう
な積層物の樹脂の硬化方法では樹脂の硬化が外周部から
起こるため肉厚のFRPパイプを製造すると樹脂の硬化
収縮により応力が発生し第1図に示すようなりラック3
が発生しやすい欠点がある。これを防止するには積層物
の樹脂硬化をゆるやかにして内部応力の低減をはかるこ
とが必要である。そのため加熱硬化温度を低くし長時間
加熱する手段を取っている。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an FRP vibe. FRP vibes are made by wrapping a laminate of prepreg made of thermosetting resin around an iron core and curing it by heating from the outside, or by wrapping a reinforcing material around the iron core and vacuum impregnating it with thermosetting resin. It is usually manufactured by heating and curing from the outside. In this method of curing resin for laminates, the resin hardens from the outer periphery, so when a thick FRP pipe is manufactured, stress is generated due to curing and shrinkage of the resin, resulting in rack 3 as shown in Figure 1.
There is a drawback that it is easy to occur. To prevent this, it is necessary to slow down the resin curing of the laminate to reduce internal stress. Therefore, measures are taken to lower the heat curing temperature and heat for a long time.
また、FRPパイプを製造する際積層物の樹脂硬化を外
部加熱によシおこなうと層間にクラック3が発生するの
は樹脂の硬化が内外部から起こるため第2図に示すよう
にFRPパイプの半径方向で外へ向う応力5と内へ向か
う応力5′が発生し。In addition, when manufacturing FRP pipes, when the resin of the laminate is cured by external heating, cracks 3 occur between the layers because the resin hardens from the inside and outside, and as shown in Figure 2, the radius of the FRP pipe An outward stress 5 and an inward stress 5' are generated in the direction.
そのため層間でクラック3が発生しやすくなる。Therefore, cracks 3 are likely to occur between the layers.
これを防止するためには成形時に、外部加熱をやめ内部
加熱をすればよいが、内部加熱をすると第3図に示すよ
うに樹脂の硬化収縮によりFR,Pパイプ半径方向で内
へ向う応力5′が発生する。To prevent this, it is possible to stop external heating and start internal heating during molding, but if internal heating is used, as shown in Figure 3, the stress 5 will be directed inward in the radial direction of the FR and P pipes due to curing and shrinkage of the resin. ' occurs.
第1〜3図において1はFR,Pパイプ、2は積層物、
4は鉄芯である。また補強材は鉄芯に巻きつけているの
で半径方向で内へ向う応力には追従して動くことができ
るので層間方向のクラックを発生させる応力にはならな
い。In Figures 1 to 3, 1 is FR, P pipe, 2 is laminate,
4 is an iron core. In addition, since the reinforcing material is wrapped around the iron core, it can move inwardly in the radial direction to follow the stress, so the stress does not cause cracks in the interlayer direction.
本発明は、PR,Pパイプを製造する際に誘導加熱性に
より内部加熱をおこない層間クラックを防止することを
目的とするものである。The present invention aims to prevent interlayer cracks by performing internal heating by induction heating when manufacturing PR and P pipes.
本発明は、鉄芯に巻いた積層物の樹脂の硬化をおこなう
際に、誘導コイルを用いて鉄芯にうず電流を流しこれに
よる発熱を利用して積層物の厚さ方向に温度勾配をつけ
て、積層物の樹脂の硬化を行なうFRPバイブの製造法
に関する。In the present invention, when curing the resin of a laminate wound around an iron core, an eddy current is passed through the iron core using an induction coil, and the resulting heat is used to create a temperature gradient in the thickness direction of the laminate. The present invention relates to a method for manufacturing an FRP vibe in which resin of a laminate is cured.
鉄芯のうず電流の発生は、誘導が熱性によって行なわれ
る。誘導加熱法は第4図に示す円筒状の誘導コイル6を
用いる。7は誘導コイルの端子である。このコイル内に
鉄芯にプリプレグ又は補強材を巻き樹脂を真空含浸した
積層物を第5図に示すように入れる。その後コイルに商
用周波の交流電圧を印加しコイルに電流を流す。コイル
に電流を流すと電磁誘導作用によりコイルの中に入れた
鉄芯にうず電流が流れ鉄芯の抵抗によるオーム損失が発
生し鉄芯が発熱する。この発熱により積層物の内側が高
温、外側が低温となり、積層物に温度勾配ができ積層物
の樹脂の硬化が鉄芯の表面(FRPパイプの内面)から
起こり前記の効果が発揮されて層間クラックを防止でき
る。積層物の厚さ方向の温度勾配は例えば第6図の曲線
9のようにされる。横軸は積層物の厚さを示す。The generation of eddy currents in the iron core is caused by thermal induction. The induction heating method uses a cylindrical induction coil 6 shown in FIG. 7 is the terminal of the induction coil. A laminate in which prepreg or reinforcing material is wrapped around an iron core and vacuum impregnated with resin is placed inside this coil as shown in FIG. After that, a commercial frequency AC voltage is applied to the coil, causing current to flow through the coil. When a current is passed through the coil, an eddy current flows through the iron core placed inside the coil due to electromagnetic induction, causing ohmic loss due to the resistance of the iron core, causing the iron core to generate heat. This heat generation causes the inside of the laminate to be high temperature and the outside to be low temperature, creating a temperature gradient in the laminate, causing the resin in the laminate to harden from the surface of the iron core (inner surface of the FRP pipe), producing the above effect and causing interlayer cracks. can be prevented. The temperature gradient in the thickness direction of the laminate is, for example, as shown by curve 9 in FIG. The horizontal axis indicates the thickness of the laminate.
本発明の積層物には熱硬化性樹脂組成物が用いられるが
、その材料9組成等には制限はない。Although a thermosetting resin composition is used in the laminate of the present invention, there are no restrictions on the material 9 composition, etc.
本発明の詳細な説明する。The present invention will be described in detail.
実施例1
第4図に示す形状の2kVAの誘導コイル(内径100
薗、長さ1000m、巻数250ターン)を用いこのコ
イル内に第5図に示すように、エポキシ樹脂組成物を含
浸した厚さ0.2 mm 、幅1000mm、長さ10
00mmのガラスクロス(日東紡製、目抜平織ガラスク
ロスWE−35BX’)のプリプレグを直径30口の鉄
芯に100回きつく巻き外径70mmにした積層物2を
入れた。これに50Hzの交流電圧を印加して鉄芯にう
ず電流を発生させた。印加電圧を調節して鉄芯表面の温
度(FTLPパイプ内面の温度)を120℃に保ち3時
間放置してプリプレグを硬化させた。この時のPR,P
パイプ内面の温度は120℃外面の温度は108℃で積
層物の温度勾配は第6図の9のようになり、プリプレグ
の硬化は内面から起こり層間クラックは発生しなかった
。積層物内の内部温度は、所定の位置に直径0.2wn
の熱電対(銅−コンスタンタン)を埋め込んで測定した
。用いたエポキシ樹脂組成物は、ビスフェノール系エポ
キシ樹脂、エビコー)1001(シェル石油社製)10
0重I・部、三弗化ホウ素モノエチルアミン、 BFs
400 (橋本化学社製)3重量部およびメチルエチ
ルケトン30重量部の混合物とした。Example 1 A 2 kVA induction coil (inner diameter 100
As shown in Fig. 5, a coil with a thickness of 0.2 mm, a width of 1000 mm, and a length of 10 is impregnated with an epoxy resin composition.
A laminate 2 in which a prepreg of glass cloth (manufactured by Nittobo, open weave glass cloth WE-35BX') of 0.00 mm was tightly wound 100 times around an iron core with a diameter of 30 to give an outer diameter of 70 mm was placed. An alternating current voltage of 50 Hz was applied to this to generate an eddy current in the iron core. The applied voltage was adjusted to keep the temperature of the iron core surface (temperature of the inner surface of the FTLP pipe) at 120° C., and the prepreg was left to stand for 3 hours to cure the prepreg. PR at this time, P
The temperature of the inner surface of the pipe was 120° C. The temperature of the outer surface was 108° C., and the temperature gradient of the laminate was as shown in 9 in FIG. 6. The prepreg hardening occurred from the inner surface and no interlayer cracks occurred. The internal temperature within the laminate is 0.2wn in diameter in place.
Measurements were made by embedding a thermocouple (copper-constantan). The epoxy resin composition used was a bisphenol-based epoxy resin, Ebicor) 1001 (manufactured by Shell Oil Company) 10
0 parts I, boron trifluoride monoethylamine, BFs
A mixture of 3 parts by weight of 400 (manufactured by Hashimoto Chemical Co., Ltd.) and 30 parts by weight of methyl ethyl ketone was prepared.
比較例1
実施例1と同じ誘導コイル内に実施例1と同じプリプレ
グを用いて実施例1と同様にして積層物を入れ、これを
120℃の恒温槽に入れ3時間加熱硬化させた。その結
果FR,Pバイブに層間クラックが発生した。なおPR
,Pバイブの加熱硬化時の温度分布はFR,Pパイプ内
面は115℃FRPパイプ外面119℃であり積層物の
温度勾配は第6図の8のようになり、内面、外面の温度
差が少なくプリプレグの硬化が外面と内面両方から起と
5−
りFRPバイブの厚さ方向中央部分でクラックが発生す
る原因となった。Comparative Example 1 A laminate was placed in the same induction coil as in Example 1 using the same prepreg as in Example 1 in the same manner as in Example 1, and the laminate was placed in a thermostat at 120° C. and cured by heating for 3 hours. As a result, interlayer cracks occurred in the FR and P vibes. Furthermore, PR
, The temperature distribution during heat curing of the P-vib is 115°C for the inner surface of the FR P pipe and 119°C for the outer surface of the FRP pipe, and the temperature gradient of the laminate is as shown in 8 in Figure 6, with little temperature difference between the inner and outer surfaces. The prepreg hardened from both the outer and inner surfaces, causing cracks to occur in the center of the FRP vibrator's thickness.
本発明の製造法により、FRPパイプを内部から加熱す
ると層間クラックを発生させることなくかつ従来法より
短時間で成形できる。さらに従来法よりも肉厚のパイプ
(内径に外径の比が4)を製造することも可能である。According to the manufacturing method of the present invention, when an FRP pipe is heated from the inside, it can be formed in a shorter time than conventional methods without generating interlayer cracks. Furthermore, it is also possible to manufacture thicker pipes (ratio of inner diameter to outer diameter of 4) than with conventional methods.
第1図はFR,Pバイブの断面図でクラックの発生を示
す図、第2図は従来法により加熱硬化したときの樹脂硬
化収縮により内外に向かう応力を示す図、第3図は本発
明により内部から加熱したときの樹脂収縮により内に向
かう応力を示す図、第4図は本発明に使用する誘導コイ
ルの外形図、第5図は本発明の実施方法を示す図及び第
6図は実施例、比較例における積層物の温度勾配を示す
図である。
符号の説明
1・・・FB、Pバイブ 2・・・積層物3・・・クラ
ック 4・・・鉄芯
6一
5.5′・・・樹脂硬化により発生する応力6・・・誘
導コイル 7・・・誘導コイルの端子7−Fig. 1 is a cross-sectional view of the FR, P vibe, showing the occurrence of cracks, Fig. 2 is a drawing showing the stress directed inward and outward due to resin curing shrinkage when heated and cured by the conventional method, and Fig. 3 is a diagram showing the stress directed inward and outward due to resin curing shrinkage when heated and cured by the conventional method. A diagram showing inward stress due to resin contraction when heated from the inside, Figure 4 is an outline diagram of the induction coil used in the present invention, Figure 5 is a diagram showing the method of implementing the present invention, and Figure 6 is a diagram showing the method of implementation It is a figure which shows the temperature gradient of the laminated material in an example and a comparative example. Explanation of symbols 1...FB, P vibe 2...Laminated product 3...Crack 4...Iron core 6-5.5'...Stress generated by resin curing 6...Induction coil 7 ...Induction coil terminal 7-
Claims (1)
誘導コイルを用いて鉄芯にうず電流を流し、これによる
発熱を利用して積層物の厚さ方向に温度勾配をつけて、
積層物の樹脂の硬化を行なうことを特徴とするFRPパ
イプの製造法。1. When curing the resin of the laminate wrapped around the iron core,
An eddy current is passed through the iron core using an induction coil, and the heat generated by this is used to create a temperature gradient in the thickness direction of the laminate.
A method for producing an FRP pipe, characterized by curing the resin of the laminate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4792884A JPS60190311A (en) | 1984-03-13 | 1984-03-13 | Manufacture of frp pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4792884A JPS60190311A (en) | 1984-03-13 | 1984-03-13 | Manufacture of frp pipe |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60190311A true JPS60190311A (en) | 1985-09-27 |
Family
ID=12789025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4792884A Pending JPS60190311A (en) | 1984-03-13 | 1984-03-13 | Manufacture of frp pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60190311A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011148246A (en) * | 2010-01-25 | 2011-08-04 | Asahi Kasei E-Materials Corp | Manufacturing method of printing base material, printing original plate and printing plate, and apparatus for manufacturing printing base material |
-
1984
- 1984-03-13 JP JP4792884A patent/JPS60190311A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011148246A (en) * | 2010-01-25 | 2011-08-04 | Asahi Kasei E-Materials Corp | Manufacturing method of printing base material, printing original plate and printing plate, and apparatus for manufacturing printing base material |
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Raff et al. | Adhesion of metals to polymers 1. study of interfaces modified by inductive heating: Journal of Applied Polymer Science, Vol 13, No 6, p 1129 (1969) |