JPH0760765A - Rtm molding method - Google Patents
Rtm molding methodInfo
- Publication number
- JPH0760765A JPH0760765A JP23071793A JP23071793A JPH0760765A JP H0760765 A JPH0760765 A JP H0760765A JP 23071793 A JP23071793 A JP 23071793A JP 23071793 A JP23071793 A JP 23071793A JP H0760765 A JPH0760765 A JP H0760765A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- resin
- elastic seal
- pressure
- molding
- 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
- Moulds For Moulding Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、成形型を使用してＦＲ
Ｐ製品などを成形する方法に関するものである。FIELD OF THE INVENTION The present invention uses a molding die for FR
The present invention relates to a method for molding a P product or the like.
【０００２】[0002]
【従来の技術】近年、ＦＲＰ（ガラス繊維強化樹脂）製
品が自動車の外板等の各種成形品に使用されるようにな
った。例えば自動車のエンジンフ−ドをＦＲＰ製とする
場合には、成形品の剛性、強度等を確保するため、ガラ
ス繊維等の強化用繊維を複数枚重ねて予めマット状に成
形し、このガラス繊維マットを金型にセットし、型内に
溶融樹脂を注入して成形するレジントランスファモール
ディング（以下、ＲＴＭという）が採用されている。2. Description of the Related Art In recent years, FRP (glass fiber reinforced resin) products have come to be used for various molded products such as outer panels of automobiles. For example, when the engine hood of an automobile is made of FRP, in order to secure the rigidity, strength, etc. of the molded product, a plurality of reinforcing fibers such as glass fibers are superposed on each other and molded in a mat shape in advance. Resin transfer molding (hereinafter, referred to as RTM) in which a mat is set in a mold and molten resin is injected into the mold for molding is adopted.
【０００３】ＲＴＭに使用する成形型は、図５に示すよ
うに、下型１と上型２との間にキャビティ３を形成し、
キャビティ３の周縁を突合わせてパ−ティング面Ｐとし
たものであって、パ−ティング面Ｐには弾性シール７を
配設する。成形型は、ニッケル鍍金などにより析出成形
した電鋳殻を金型の成形面に使用した電鋳型が多く使用
されている。この金型を用いて、キャビティ３にガラス
繊維マットをセットし、熱硬化性樹脂を上型２の注入口
４から注入し、恒温保持された金型の熱により反応硬化
させる。As shown in FIG. 5, a molding die used for RTM has a cavity 3 formed between a lower die 1 and an upper die 2,
A peripheral surface of the cavity 3 is abutted to form a parting surface P, and an elastic seal 7 is arranged on the parting surface P. As the molding die, an electroforming mold in which an electroforming shell formed by precipitation molding with nickel plating or the like is used on the molding surface of the mold is often used. Using this mold, a glass fiber mat is set in the cavity 3, a thermosetting resin is injected from the injection port 4 of the upper mold 2, and the mold is reacted and cured by the heat of the mold kept at a constant temperature.
【０００４】実開昭６２−５８６１８号公報には、ゴム
又は合成樹脂の弾性材によるシーリング材を下型又は上
型の当り面に装着し、シーリング材に対応する面を仕上
げ面としたモールド成形用型が記載されている。また、
本出願人の出願に係る実開平５−２６３３１号公報に
は、図６に示すように、一方の型２のキャビティ３の周
りにアルミテープ１０を接着した環状弾性シール部材７
を配設し、このシール部材の表面と他方の型１の当り面
でパーティング面Ｐを形成したＲＴＭ成形型が記載され
ている。In Japanese Utility Model Laid-Open No. 62-58618, a sealing material made of an elastic material of rubber or synthetic resin is attached to the contact surface of a lower mold or an upper mold, and the surface corresponding to the sealing material is used as a finish surface for molding. The mold is described. Also,
In Japanese Utility Model Laid-Open No. 5-26331 filed by the applicant of the present application, as shown in FIG. 6, an annular elastic seal member 7 in which an aluminum tape 10 is adhered around a cavity 3 of one mold 2 is shown.
And a parting surface P is formed by the surface of the seal member and the contact surface of the other mold 1.
【０００５】[0005]
【発明が解決しようとする課題】ＲＴＭ等の低圧成形法
は、安価な電鋳型が使用できる利点があるが、上記の公
開公報に示されたように上下型のパーティング面を弾性
体でシールしたとき、弾性体が相手方の型に当る面圧が
高過ぎると、樹脂を注入したときに型内のエアーが抜け
ず、型内にエアー溜りができて樹脂が十分に型内に充填
できず、成形品にショートと呼ばれる樹脂の未充填部が
出るなど、成形不良の原因となる。また、弾性体の面圧
が低過ぎると、型内にエアーは溜らないが、注入した樹
脂が漏れてしまい樹脂が型内に均一に充填されず、成形
品にショートが発生する。更に、樹脂が型と弾性体の間
に入り、バリが発生するため、成形後に製品からバリを
除く作業が必要となる。従来この弾性体の面圧調整は、
型内に樹脂を注入してエアー溜り部位や樹脂洩れ部位を
確認し、その都度その部位の面圧を調整する作業を繰返
す必要があるため、非常に手間がかかる。The low-pressure molding method such as RTM has an advantage that an inexpensive electroforming mold can be used. However, as shown in the above-mentioned publication, the upper and lower parting surfaces are sealed with an elastic body. When the contact pressure of the elastic body against the other mold is too high, the air inside the mold will not escape when the resin is injected, and air will be trapped inside the mold and the resin will not be able to fill the mold sufficiently. However, this may cause defective molding, such as the appearance of unfilled parts of resin called shorts. Further, if the surface pressure of the elastic body is too low, air does not collect in the mold, but the injected resin leaks and the resin is not uniformly filled in the mold, causing a short circuit in the molded product. Further, since the resin enters between the mold and the elastic body to generate burrs, it is necessary to remove the burrs from the product after molding. Conventionally, the surface pressure adjustment of this elastic body is
Since it is necessary to inject the resin into the mold to check the air trapped portion and the resin leaked portion and to adjust the surface pressure of that portion each time, it is very troublesome.
【０００６】本発明は前記の課題を解決し、型内のエア
ーは充分抜けるが、樹脂漏れは起きないように弾性体の
面圧を容易に調整でき、成形不良を発生させることのな
い成形方法を提供することを目的とするものである。The present invention solves the above-mentioned problems, and the surface pressure of the elastic body can be easily adjusted so that resin leakage does not occur although the air in the mold sufficiently escapes, and a molding method that does not cause molding defects. It is intended to provide.
【０００７】[0007]
【課題を解決するための手段】本発明は、分割型の一方
の型の成形面の周りに他方の型と当接する弾性シールを
配設した金型内に樹脂を注入する成形法において、樹脂
注入圧力を５〜１０Ｋｇ／ｃｍ2とするとき、弾性シー
ルの面圧を２０〜３０Ｋｇ／ｃｍ2に調整するＲＴＭ成
形方法である。弾性シールを一方の型の成形面の周りに
凹部を形成して配設し、該凹部にシム板を敷込むことに
より弾性シールの面圧を所定値の範囲に調整する。According to the present invention, there is provided a molding method for injecting a resin into a mold in which an elastic seal is provided around one molding surface of one mold of a split mold so as to abut against the other mold. This is an RTM molding method in which the surface pressure of the elastic seal is adjusted to 20 to 30 Kg / cm 2 when the injection pressure is 5 to 10 Kg / cm 2 . The elastic seal is provided by forming a recess around the molding surface of one mold, and a shim plate is laid in the recess to adjust the surface pressure of the elastic seal within a predetermined range.
【０００８】[0008]
【作用】型内のエアーは充分抜けるが、樹脂漏れは起き
ないように弾性シールの面圧を所定の範囲に容易に調整
することができ、製品に成形不良を発生させない。The air in the mold escapes sufficiently, but the surface pressure of the elastic seal can be easily adjusted within a predetermined range so that resin leakage does not occur, and molding defects do not occur in the product.
【０００９】[0009]
【実施例】本発明の実施例を図面を参照して説明する。
図３は下型の平面図、図４は金型の正面図、図１は、図
３のＸ−Ｘ線に沿う部分の金型の一部断面図である。下
型１のキャビティ３の周りを取囲む部位に凹溝を形成し
て弾性シール７を装着する。下型１と上型２の周りに
は、型締時に下型１と上型２との間に突き当てブロック
６を装着するための凹部５をそれぞれ数箇所に設ける。
型締した状態では、図４に示すように、下型１と上型２
の周縁に突き当てブロック６が数箇所に介装される。こ
の金型にプレス機で成形圧力を加えると、突き当てブロ
ック６が圧力を受けて下型１と上型２の間隔を保持する
と共に、弾性シール７に面圧が発生し、キャビティ３の
周りをシールする。熱硬化性樹脂を上型２の注入口４か
ら注入し、恒温保持された金型の熱により反応硬化させ
る。Embodiments of the present invention will be described with reference to the drawings.
3 is a plan view of the lower mold, FIG. 4 is a front view of the mold, and FIG. 1 is a partial cross-sectional view of the mold along a line XX in FIG. A concave groove is formed in a portion surrounding the cavity 3 of the lower mold 1 and the elastic seal 7 is mounted. Around each of the lower mold 1 and the upper mold 2, there are provided several recesses 5 for mounting the butting blocks 6 between the lower mold 1 and the upper mold 2 during mold clamping.
In the mold clamped state, as shown in FIG. 4, the lower mold 1 and the upper mold 2
The abutting blocks 6 are provided at several positions around the periphery of the. When a molding pressure is applied to this mold by the press machine, the butting block 6 receives the pressure to maintain the space between the lower mold 1 and the upper mold 2, and the surface pressure is generated in the elastic seal 7 to surround the cavity 3. Seal. A thermosetting resin is injected from the injection port 4 of the upper mold 2 and is reaction-cured by the heat of the mold kept at a constant temperature.
【００１０】熱硬化性樹脂として充填剤等をコンパウン
ドした不飽和ポリエステル樹脂（２５℃における粘度：
５〜１０ｐｓ）を使用するときに、樹脂注入圧力を５〜
１０Ｋｇ／ｃｍ2（樹脂注入ノズル先端部の実測値）と
する。これは、樹脂のゲル化速度による制約で、樹脂注
入圧力が５Ｋｇ／ｃｍ2未満となると成形不良となり、
また樹脂注入圧力が１０Ｋｇ／ｃｍ2を超えると、プレ
ス機等の設備能力及び金型の強度による制約があるため
である。An unsaturated polyester resin compounded with a filler as a thermosetting resin (viscosity at 25 ° C .:
5 to 10 ps), the resin injection pressure should be 5 to
10 kg / cm 2 (measured value at the tip of the resin injection nozzle). This is a restriction due to the gelation rate of the resin, and if the resin injection pressure is less than 5 Kg / cm 2 , molding failure will occur,
Further, if the resin injection pressure exceeds 10 Kg / cm 2 , there is a restriction due to the capacity of the press machine and the strength of the mold.
【００１１】金型のパ−ティング面に弾性シールを配設
した場合のシール面圧は、上記の樹脂注入圧力としたと
きに、２０〜３０Ｋｇ／ｃｍ2とするのが最適となるこ
とが実験の結果判明した。図２は、樹脂注入圧力とシー
ル面圧との関係の説明図である。シール面圧が２０Ｋｇ
／ｃｍ2未満（図のの領域）では、エアーは逃げるが
樹脂も洩れてしまう。また、シール面圧が３０Ｋｇ／ｃ
ｍ2を超える（図のの領域）と、エアーが抜けなくな
る。エアーは逃げるが樹脂が洩れないシール面圧は、２
０〜３０Ｋｇ／ｃｍ2の範囲（図のの領域）となる。
前記のように、樹脂注入圧力は５Ｋｇ／ｃｍ2以上で１
０Ｋｇ／ｃｍ2を超え（図のの領域）ない範囲とする
必要があるので、図に実線で囲んだ範囲に樹脂注入圧力
とシール面圧を設定する。実際の金型における有効な樹
脂注入圧力とシール面圧の範囲は、キャビティの形状に
よる圧力損失が生ずるので、図に鎖線で模式的に示した
範囲となる。Experiments have shown that the optimum sealing surface pressure when an elastic seal is provided on the parting surface of the mold is 20 to 30 kg / cm 2 when the above resin injection pressure is used. It turned out. FIG. 2 is an explanatory diagram of the relationship between the resin injection pressure and the seal surface pressure. Seal surface pressure is 20 kg
If it is less than / cm 2 (area in the figure), air escapes but resin also leaks. Moreover, the sealing surface pressure is 30 kg / c.
If it exceeds m 2 (area in the figure), air will not escape. Air escapes but resin does not leak Seal surface pressure is 2
It is in the range of 0 to 30 Kg / cm 2 (area in the figure).
As mentioned above, the resin injection pressure is 5 Kg / cm 2 or more and 1
Since it is necessary to set the range so as not to exceed 0 Kg / cm 2 (region shown in the figure), the resin injection pressure and the seal surface pressure are set in the range surrounded by the solid line in the figure. The range of effective resin injection pressure and seal surface pressure in the actual mold is the range schematically shown by the chain line in the figure because pressure loss occurs due to the shape of the cavity.
【００１２】図１において、下型１の凹溝１ａに装着さ
れた弾性シール７は、型締したときに上型２の当り面２
ａと幅Ｄで接触する。この幅Ｄは、シール面圧と弾性シ
ール７を装着する下型１の凹溝１ａの剛性を考慮して決
定する。金型のキャビティ３が図３に示すような単純な
形状の場合は、弾性シール７の面圧を一定にすることは
比較的容易である。しかし、自動車の外板パネルのよう
に、三次元方向に弾性シールの当り面形状が変わる製品
を成形する金型では、下型１の凹溝１ａの底と上型２の
当り面２ａとの間隔Ｌを一定に製作することは極めて困
難となる。また、金型には、製作誤差や温度調節に伴う
熱膨張による歪が発生し、間隔Ｌが金型の部位により変
化する。したがって、一定寸法の弾性シール７を下型１
の凹溝１ａに装着しただけでは、弾性シール７の面圧を
全周に亘り上記の圧力範囲に均一に保つことができなく
なる。In FIG. 1, the elastic seal 7 mounted in the concave groove 1a of the lower mold 1 has a contact surface 2 of the upper mold 2 when the mold is clamped.
Contact a with a width D. The width D is determined in consideration of the seal surface pressure and the rigidity of the concave groove 1a of the lower mold 1 on which the elastic seal 7 is mounted. When the mold cavity 3 has a simple shape as shown in FIG. 3, it is relatively easy to make the surface pressure of the elastic seal 7 constant. However, in a mold for molding a product in which the contact surface shape of the elastic seal changes in the three-dimensional direction, such as the outer panel of an automobile, the bottom of the concave groove 1a of the lower mold 1 and the contact surface 2a of the upper mold 2 are formed. It is extremely difficult to make the distance L constant. Further, in the mold, distortion occurs due to manufacturing error and thermal expansion due to temperature adjustment, and the interval L changes depending on the part of the mold. Therefore, the elastic seal 7 having a certain size is attached to the lower mold 1.
It is not possible to uniformly maintain the surface pressure of the elastic seal 7 in the above pressure range over the entire circumference only by mounting it in the concave groove 1a.
【００１３】本発明では、黄銅、ゴムシート等で０．１
〜０．５ｍｍの範囲で各種厚さのシム板８を用意し、下
型１の凹溝１ａの底と上型２の当り面２ａとの間隔Ｌを
実測し、その部位の下型１の凹溝１ａの底に所望厚さの
シム板８を敷込み、その上に弾性シール７を装着して間
隔Ｌを一定にする。この場合に、弾性シールの圧縮強さ
に応じて求めたシム板厚さに対する面圧との関係を示す
データシートを利用すると、必要とするシム板厚さを概
略設定できる。このようにして弾性シール７の全周に亘
り間隔Ｌを調整した後、感圧紙９を弾性シール７と上型
２の当り面２ａとの間にはさみ込み、所定の成形圧力を
金型に加え型締してシール面圧をチェックし、シール面
圧が上記の圧力範囲内にあることを確認してから実生産
に供する。In the present invention, brass, rubber sheet, etc.
A shim plate 8 having various thicknesses within a range of up to 0.5 mm is prepared, the distance L between the bottom of the concave groove 1a of the lower mold 1 and the contact surface 2a of the upper mold 2 is measured, and the lower mold 1 of that portion is measured. A shim plate 8 having a desired thickness is laid on the bottom of the groove 1a, and an elastic seal 7 is mounted on the shim plate 8 to keep the distance L constant. In this case, the required shim plate thickness can be roughly set by using the data sheet showing the relationship between the shim plate thickness and the surface pressure obtained according to the compressive strength of the elastic seal. After adjusting the distance L over the entire circumference of the elastic seal 7 in this manner, the pressure sensitive paper 9 is sandwiched between the elastic seal 7 and the contact surface 2a of the upper mold 2, and a predetermined molding pressure is applied to the mold. The mold is clamped and the seal surface pressure is checked, and after confirming that the seal surface pressure is within the above pressure range, it is put into actual production.
【００１４】上記の方法はレジンインジェクション（Ｒ
Ｉ）等の低圧成形法に適用できるのは勿論であり、成形
用樹脂として低粘度の樹脂を使用する場合又は樹脂注入
圧力を大幅に上昇させる場合には、シール面及び弾性シ
ールの装着溝に樹脂の差込みが発生する。この対策とし
ては、硬度の高い弾性シール材を使用し、かつシール面
圧を上昇させるのが有効となる。また、注入口とキャビ
ティの外縁が近い製品形状の金型では、その付近のシー
ル面圧だけを高面圧に設定するのが有効となる。The above method is based on the resin injection (R
Of course, it can be applied to low-pressure molding methods such as I), and when a low-viscosity resin is used as the molding resin, or when the resin injection pressure is significantly increased, the sealing surface and the mounting groove of the elastic seal are used. Insertion of resin occurs. As a countermeasure against this, it is effective to use an elastic seal material having high hardness and increase the seal surface pressure. Further, in a mold having a product shape in which the injection port and the outer edge of the cavity are close to each other, it is effective to set only the seal surface pressure in the vicinity thereof to a high surface pressure.
【００１５】[0015]
【発明の効果】本発明は、型内のエアーは充分抜ける
が、樹脂漏れは起きないように弾性シールの面圧を容易
に調整することができ、成形不良を発生させることがな
いと共に、生産性の向上を図ることができる。Industrial Applicability According to the present invention, although the air in the mold is sufficiently released, the surface pressure of the elastic seal can be easily adjusted so that resin leakage does not occur. It is possible to improve the sex.
【図１】本発明に使用する金型の要部の断面図。FIG. 1 is a sectional view of a main part of a mold used in the present invention.
【図２】樹脂注入圧力とシール面圧との説明図。FIG. 2 is an explanatory diagram of resin injection pressure and seal surface pressure.
【図３】本発明に使用する下型の平面図。FIG. 3 is a plan view of a lower mold used in the present invention.
【図４】本発明に使用する金型の正面図。FIG. 4 is a front view of a mold used in the present invention.
【図５】従来の金型の断面図。FIG. 5 is a cross-sectional view of a conventional mold.
【図６】従来の他の金型の要部の断面図。FIG. 6 is a sectional view of a main part of another conventional mold.
１ 下型 ２ 上型 ３ キャビティ ７ 弾性
シール ８ シム板 ９ 感圧紙1 Lower mold 2 Upper mold 3 Cavity 7 Elastic seal 8 Shim plate 9 Pressure sensitive paper
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｋ 105:06 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area // B29K 105: 06
Claims (2)
の型と当接する弾性シールを配設した金型内に樹脂を注
入する成形法において、樹脂注入圧力を５〜１０Ｋｇ／
ｃｍ2とするとき、弾性シールの面圧を２０〜３０Ｋｇ
／ｃｍ2に調整することを特徴とするＲＴＭ成形方法。1. In a molding method in which a resin is injected into a mold in which an elastic seal that abuts against the other mold is arranged around the molding surface of one of the split molds, the resin injection pressure is 5 to 10 kg /
When the pressure is cm 2 , the surface pressure of the elastic seal is 20 to 30 kg.
/ Cm 2 It adjusts to, and the RTM molding method characterized by the above-mentioned.
を形成して他方の型と当接する弾性シールを配設し、該
凹部にシム板を敷込むことにより弾性シールの面圧を所
定値の範囲に調整する請求項１記載のＲＴＭ成形方法。2. A surface pressure of the elastic seal is provided by forming a recess around a molding surface of one of the split molds and disposing an elastic seal that abuts against the other mold, and laying a shim plate in the recess. The RTM molding method according to claim 1, wherein is adjusted to a predetermined value range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23071793A JP3475455B2 (en) | 1993-08-25 | 1993-08-25 | RTM molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23071793A JP3475455B2 (en) | 1993-08-25 | 1993-08-25 | RTM molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0760765A true JPH0760765A (en) | 1995-03-07 |
| JP3475455B2 JP3475455B2 (en) | 2003-12-08 |
Family
ID=16912210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23071793A Expired - Fee Related JP3475455B2 (en) | 1993-08-25 | 1993-08-25 | RTM molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3475455B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144994A (en) * | 2005-10-31 | 2007-06-14 | Toray Ind Inc | Method for molding fiber-reinforced plastic, its molding apparatus and molded body |
| CN106275582A (en) * | 2016-09-22 | 2017-01-04 | 伟创力电子技术(苏州)有限公司 | Adjustable pressure discharge type photographic head mould pressfitting fixture and using method |
-
1993
- 1993-08-25 JP JP23071793A patent/JP3475455B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144994A (en) * | 2005-10-31 | 2007-06-14 | Toray Ind Inc | Method for molding fiber-reinforced plastic, its molding apparatus and molded body |
| CN106275582A (en) * | 2016-09-22 | 2017-01-04 | 伟创力电子技术(苏州)有限公司 | Adjustable pressure discharge type photographic head mould pressfitting fixture and using method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3475455B2 (en) | 2003-12-08 |
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