JP3432582B2 - Reaction injection mold - Google Patents
Reaction injection moldInfo
- Publication number
- JP3432582B2 JP3432582B2 JP7419394A JP7419394A JP3432582B2 JP 3432582 B2 JP3432582 B2 JP 3432582B2 JP 7419394 A JP7419394 A JP 7419394A JP 7419394 A JP7419394 A JP 7419394A JP 3432582 B2 JP3432582 B2 JP 3432582B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cavity
- resin
- reaction injection
- hard metal
- 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 - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、型の主要部が樹脂から
なる上下型内に繊維成形体を設置し、型締め後、熱硬化
性樹脂を注入して硬化させる反応射出成形型に関するも
のである。
【０００２】
【従来の技術】近年、予備成形された繊維成形体に型内
で熱硬化性樹脂を含浸させて硬化させる反応射出成形と
してＲＩ法またはＳＲＩＭ成形法が注目されている。こ
れは、予備成形された繊維成形体をキャビティ内にセッ
トし、型締めして熱硬化性樹脂を注入し、繊維成形体に
含浸させ、硬化させることにより繊維強化樹脂（ＦＲ
Ｐ）製品を得るものである。その型としては、従来の例
えばＲＴＭ（レジントランファモールディング）成形法
と同様に電鋳型、金属型が主に用いられており、型の製
作に長い工期と高い製造コストを必要としていた。
【０００３】そこで、安価な樹脂型を使用することが考
えられるが、樹脂型は型の合わせ面とキャビティとの境
界のエッジ部が比較的弱いことから、繊維成形体の端縁
部が型から外れた場合、型締め時に上記エッジ部が圧迫
されて破損し易くなると共に該部分に隙間ができ、樹脂
を注入する際に外部に樹脂が洩れ、１サイクル毎に型か
ら漏れて固化した樹脂を取り除いたり、製品の周囲をト
リミングするなど、厄介なメンテナンスを行わなければ
ならず、成形サイクルが長くなり、生産性が低下すると
云う問題があった。
【０００４】
【発明が解決しようとする課題】本発明は上記したよう
な従来技術の問題点に鑑みなされたものであり、その主
な目的は、ＲＩ法またはＳＲＩＭ成形法などに用いる型
コストを低廉化し、かつ成形時の製品の後加工、メンテ
ナンスを容易にして成形サイクルを短くすることが可能
な反応射出成形型を提供することにある。
【０００５】
【課題を解決するための手段】上記した目的は本発明に
よれば、型の主要部が樹脂からなる上下型内に繊維成形
体を設置し、型締め後、熱硬化性樹脂を注入して硬化さ
せる反応射出成形型に於て、前記上型と下型との合わせ
面部であって前記両型により画定されるキャビティ縁部
及びそれに連続する近傍部分のみが共に硬質金属からな
り、かつ該硬質金属からなる型合わせ面の周囲に、熱硬
化性樹脂がキャビティ外へ漏れることを防止するための
シールを設けたことを特徴とする反応射出成形型を提供
することにより達成される。
【０００６】
【作用】このように、上型と下型とにより画定されるキ
ャビティ縁部及びその近傍の前記両型の合わせ面部が共
に硬質金属からなり、かつ該硬質金属からなる型合わせ
面の周囲に、熱硬化性樹脂がキャビティ外へ漏れること
を防止するためのシールを設けることにより、製品端末
部に対応する部分の型強度が確保され、容易にＲＩ法、
ＳＲＩＭ法への樹脂型の採用が可能となり、型コスト、
型の大幅な軽量化が可能になる。また製品の二次加工、
型のメンテナンスを大幅減少できる。
【０００７】
【実施例】以下、本発明の好適実施例を添付の図面につ
いて詳しく説明する。
【０００８】図１は、本発明が適用されたＲＩ法による
反応射出成形型を示す縦断面図である。この型はその主
要部分が樹脂からなり、かつ型面にニッケルの無電解め
っきが施された上型１及び下型２を有し、型締めした際
にその内部にキャビティ３が画定されるようになってい
る。また、図１の上型１のみをその下方から見た図２に
併せて示すように、この型の図１及び図２に於ける左側
端部には熱硬化性樹脂をキャビティ３内に注入するため
のファンゲート４が設けられている。
【０００９】図１の要部を拡大して見た図３及び図２に
示すように、上型１のキャビティ３縁部及びその近傍の
合わせ面部に、硬質金属としてのジェラルミン（ＪＩＳ
７０７５）からなるシート５が埋設され、かつ上記シー
ト５と対向する下型２のキャビティ３縁部及びその近傍
の合わせ面部に、同じくジェラルミンからなるシート６
が埋設されている。即ち、本実施例の型のキャビティ３
縁部及びその近傍の合わせ面部は硬質金属からなる。
【００１０】また、下型２のシート６の外周にはその全
周に亘りシリコンパッキン７が埋設され、上型１の該パ
ッキン７と対向する位置に設けられ、型締め時にシリコ
ンパッキン７に密着する突条８が設けられている。更
に、上型１の突条８の外周にはその全周に亘り型締め時
に下型２の合わせ面に密着するＯリング９が設けられて
いる。これらシリコンパッキン７と突条８とにより、ま
たＯリング９により熱硬化性樹脂を注入する際に該樹脂
がキャビティ３外に漏れることを防止する２重シールを
なしている。
【００１１】実際にこの反応射出成形型により製品を製
造するには、まず、スタンピング法などにより予備成形
された繊維成形体１０を下型２にセットして型締めす
る。すると、上型２のシート５と下型３のシート６とが
密着し、繊維成形体１０の端末縁部が型合わせ面にはみ
出していても該部分を切断することから成形後にトリミ
ングする必要がない。また、云うまでもなくこのシート
５、６により上型１及び下型２のキャビティ３縁部及び
型合わせ面部を傷つける心配がない。
【００１２】次に、熱硬化性樹脂をキャビティ３内に注
入し、硬化させ、最後に型開きして製品を取り出すこと
となる。このとき、シリコンパッキン７と突条８とによ
り、またＯリング９により確実に樹脂がシールされ、型
外へ流出することがない。
【００１３】上記型により製品を成形する試験を下記の
条件にて行ったが型の破損、トラブルは発生せず、本発
明型のＳＲＩＭ成形法への適用が充分可能であることが
確認できた。
【００１４】成形条件：型温度→７０℃〜８０℃（温水
温調）、樹脂温度→２０℃〜３０℃（ポリエステル系材
料）、ガラス繊維→２ｐｌｙ〜５ｐｌｙ（チョップドス
トランドマット（＃４５０））、型締圧力→７５（ｔｏ
ｎ）、吐出（注入）圧力→１００kg/cm2ＭＡＸ、型内圧
力→５０kg/cm2ＭＡＸ、型内温度→１５０℃ＭＡＸ（樹
脂反応温度）。
【００１５】
【発明の効果】上記した説明により明らかなように、本
発明による反応射出成形型によれば、上型と下型とによ
り画定されるキャビティ縁部及びその近傍の前記両型の
合わせ面部が共に硬質金属からなり、かつ該硬質金属か
らなる型合わせ面の周囲に、熱硬化性樹脂がキャビティ
外へ漏れることを防止するためのシールを設けることに
より、製品端末部に対応する部分の型強度が確保され、
容易にＲＩ法、ＳＲＩＭ法への樹脂型の採用が可能とな
り、型コスト、型の大幅な軽量化が可能になり、かつ製
品端末部から型外への樹脂流出をシールすることと相俟
って成形サイクルの短縮、製品の二次加工の大幅減少等
による生産性の改善が可能になる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a fiber molding is placed in an upper and lower mold in which a main part of the mold is made of resin, and after the mold is clamped, a thermosetting resin is injected. And a reaction injection mold for curing. [0002] In recent years, the RI method or the SRIM molding method has attracted attention as a reaction injection molding method in which a thermoformed resin is impregnated and cured in a preformed fiber molded article in a mold. This is done by setting a preformed fiber molded body in a cavity, closing the mold, injecting a thermosetting resin, impregnating the fiber molded body, and curing the fiber reinforced resin (FR).
P) Obtain the product. As the mold, an electroforming mold and a metal mold are mainly used as in the conventional RTM (resin transfer molding) molding method, and the production of the mold requires a long construction period and a high production cost. Therefore, it is conceivable to use an inexpensive resin mold. However, since the edge of the boundary between the mating surface of the mold and the cavity is relatively weak, the end of the fiber molded product is not easily separated from the mold. When the resin comes off, the edge part is squeezed when the mold is clamped, which is likely to be damaged, and a gap is formed in the part. A troublesome maintenance, such as removal or trimming around the product, must be performed, resulting in a problem that the molding cycle is lengthened and the productivity is reduced. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and its main object is to reduce the cost of a mold used for the RI method or the SRIM molding method. An object of the present invention is to provide a reaction injection mold that can be manufactured at a low cost, facilitate post-processing and maintenance of a product at the time of molding, and shorten the molding cycle. [0005] According to the present invention, there is provided a fiber molded body in an upper and lower mold in which a main part of the mold is made of a resin, and after closing the mold, removes the thermosetting resin. In a reaction injection mold that is poured and cured, the upper mold and lower mold are combined.
Only a portion near a continuous cavity edges and Re its defined by the dies a surface portion both composed of hard metal, and around the die matching surface made of rigid metal, a thermosetting resin is outside the cavity This is attained by providing a reaction injection mold provided with a seal for preventing leakage to the outside. As described above, the cavity edge defined by the upper mold and the lower mold and the mating surface of the two dies near the cavity are both made of hard metal, and the mold mating surface made of the hard metal is formed. By providing a seal around the thermosetting resin to prevent the thermosetting resin from leaking out of the cavity, the mold strength of the portion corresponding to the product terminal is secured, and the RI method can be easily performed.
The adoption of resin mold for SRIM method becomes possible,
Significant weight reduction of the mold becomes possible. Also, secondary processing of products,
Die maintenance can be greatly reduced. Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a reaction injection molding die by the RI method to which the present invention is applied. This mold has an upper mold 1 and a lower mold 2 whose main parts are made of resin and whose surface is electrolessly plated with nickel, so that a cavity 3 is defined inside when the mold is clamped. It has become. Also, as shown in FIG. 2 which shows only the upper mold 1 of FIG. 1 from below, a thermosetting resin is injected into the cavity 3 at the left end of the mold in FIGS. Fan gate 4 is provided. As shown in FIGS. 3 and 2 which are enlarged views of the main part of FIG. 1, the edge of the cavity 3 of the upper mold 1 and the mating surface near the cavity are provided with a duralumin (JIS) as a hard metal.
7075) is embedded in the lower die 2 facing the sheet 5, and the lower surface of the cavity 3 is formed on the edge of the cavity 3 and on the mating surface near the same.
Is buried. That is, the cavity 3 of the mold of this embodiment
The edge and the mating surface near the edge are made of hard metal. A silicon packing 7 is buried all around the outer periphery of the sheet 6 of the lower die 2 and is provided at a position facing the packing 7 of the upper die 1 so as to be in close contact with the silicon packing 7 when the die is clamped. A ridge 8 is provided. Further, an O-ring 9 is provided on the outer periphery of the ridge 8 of the upper mold 1 over the entire periphery thereof so as to be in close contact with the mating surface of the lower mold 2 when the mold is clamped. The silicone seal 7 and the ridges 8 and the O-ring 9 form a double seal for preventing the resin from leaking out of the cavity 3 when the resin is injected. In order to actually manufacture a product using the reaction injection molding die, first, a fiber molded body 10 preformed by a stamping method or the like is set in the lower die 2 and clamped. Then, the sheet 5 of the upper mold 2 and the sheet 6 of the lower mold 3 are in close contact with each other, and even if the terminal edge of the fiber molded body 10 protrudes into the mold mating surface, the part is cut. Absent. Needless to say, the sheets 5 and 6 do not damage the edges of the cavity 3 of the upper mold 1 and the lower mold 2 and the mold mating surface. Next, a thermosetting resin is injected into the cavity 3 and cured, and finally the mold is opened to take out the product. At this time, the resin is securely sealed by the silicon packing 7 and the ridges 8 and by the O-ring 9, so that the resin does not flow out of the mold. A test for molding a product with the above mold was conducted under the following conditions, but no breakage or trouble occurred in the mold, and it was confirmed that the mold of the present invention was sufficiently applicable to the SRIM molding method. . Molding conditions: mold temperature → 70 ° C. to 80 ° C. (hot water temperature control), resin temperature → 20 ° C. to 30 ° C. (polyester material), glass fiber → 2 ply to 5 ply (chopped strand mat (# 450)) Mold clamping pressure → 75 (to
n), discharge (injection) pressure → 100 kg / cm 2 MAX, mold pressure → 50 kg / cm 2 MAX, mold temperature → 150 ° C. MAX (resin reaction temperature). As is apparent from the above description, according to the reaction injection molding die of the present invention, the cavity edge defined by the upper die and the lower die and the combination of the two dies near the cavity edge. Both surfaces are made of hard metal, and by providing a seal around the mating surface made of the hard metal to prevent the thermosetting resin from leaking out of the cavity, a portion corresponding to the product terminal portion is provided. Mold strength is secured,
It is possible to easily adopt the resin mold for the RI method and the SRIM method, and it is possible to significantly reduce the mold cost and the mold, and also to seal the resin outflow from the product terminal to the outside of the mold. As a result, productivity can be improved by shortening the molding cycle and greatly reducing secondary processing of products.
【図面の簡単な説明】
【図１】本発明が適用されたＲＩ法による反応射出成形
型を示す縦断面図。
【図２】図１の上型のみをその下方から見た図。
【図３】図１の要部拡大図。
【符号の説明】
１ 上型
２ 下型
３ キャビティ
４ ファンゲート
５、６ ジェラルミンシート
７ シリコンパッキン
８ 突条
９ Ｏリング
１０ 繊維成形体BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a reaction injection molding die by an RI method to which the present invention is applied. FIG. 2 is a view of only the upper mold of FIG. 1 viewed from below. FIG. 3 is an enlarged view of a main part of FIG. 1; [Description of Signs] 1 Upper die 2 Lower die 3 Cavity 4 Fan gate 5, 6 Geralmine sheet 7 Silicon packing 8 Ridge 9 O-ring 10 Fiber molded body
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−116172（ＪＰ，Ａ) 特開 平６−8253（ＪＰ，Ａ) 特開 平６−258866（ＪＰ，Ａ) 特開 平３−120021（ＪＰ，Ａ) 特開 平３−115322（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/26 - 45/37 B29C 33/00 - 33/76 B29C 70/48 B29C 70/54 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-116172 (JP, A) JP-A-6-8253 (JP, A) JP-A-6-258866 (JP, A) 120021 (JP, A) JP-A-3-115322 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 45/26-45/37 B29C 33/00-33/76 B29C 70/48 B29C 70/54
Claims (1)
繊維成形体を設置し、型締め後、熱硬化性樹脂を注入し
て硬化させる反応射出成形型に於て、 前記上型と下型との合わせ面部であって前記両型により
画定されるキャビティ縁部及びそれに連続する近傍部分
のみが共に硬質金属からなり、かつ該硬質金属からなる
型合わせ面の周囲に、熱硬化性樹脂がキャビティ外へ漏
れることを防止するためのシールを設けたことを特徴と
する反応射出成形型。(57) [Claims 1] Reaction injection molding in which a fiber molded body is installed in an upper and lower mold in which a main part of the mold is made of resin, and after closing the mold, a thermosetting resin is injected and cured. type at a, the upper die and the neighboring portion continuous cavity edges and Re its a combined surface of the lower mold defined by the dies
A reaction injection molding die characterized in that only a hard metal is made of a hard metal, and a seal is provided around a mating surface made of the hard metal to prevent the thermosetting resin from leaking out of the cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7419394A JP3432582B2 (en) | 1994-03-18 | 1994-03-18 | Reaction injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7419394A JP3432582B2 (en) | 1994-03-18 | 1994-03-18 | Reaction injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07256685A JPH07256685A (en) | 1995-10-09 |
| JP3432582B2 true JP3432582B2 (en) | 2003-08-04 |
Family
ID=13540103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7419394A Expired - Fee Related JP3432582B2 (en) | 1994-03-18 | 1994-03-18 | Reaction injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3432582B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL1893395T3 (en) * | 2005-05-31 | 2021-01-25 | Proprietect L.P. | Mold and method for manufacture thereof |
-
1994
- 1994-03-18 JP JP7419394A patent/JP3432582B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07256685A (en) | 1995-10-09 |
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