JPH05177658A - Parting seal method of rtm mold - Google Patents
Parting seal method of rtm moldInfo
- Publication number
- JPH05177658A JPH05177658A JP3359065A JP35906591A JPH05177658A JP H05177658 A JPH05177658 A JP H05177658A JP 3359065 A JP3359065 A JP 3359065A JP 35906591 A JP35906591 A JP 35906591A JP H05177658 A JPH05177658 A JP H05177658A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- mold
- molding
- parting surface
- recessed groove
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0038—Moulds or cores; Details thereof or accessories therefor with sealing means or the like
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding 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、電鋳型や樹脂型等を使
用して樹脂製品を成形するＲＴＭ成形型のパーティング
シール法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parting-sealing method for an RTM molding die for molding a resin product using an electric mold or a resin mold.
【０００２】[0002]
【従来の技術】型に樹脂を注入して樹脂成形品を成形す
る製法の一種にレジン・トランスファ−・モ−ルデイン
グ（以下ＲＴＭという）と呼ばれる工法がある。このＲ
ＴＭ工法でＦＲＰ製品を成形する場合について図３を参
照して説明する。通常は上型とする凸型１と、通常は下
型とする凹型２を準備し、両型の成形部３を清掃して離
型剤を塗布する。次に、凹型２の成形部３にスプレ−ガ
ンなどでゲルコ−トを吹き付け、数分間ゲルコ−トの初
期硬化を待つ。次に、製品の補強材となるガラスマット
をゲルコ−ト上にセットし、両型１，２を閉じて型締め
し、上型１の注入口４に樹脂注入ノズルを装着し、注入
機を作動させて樹脂９を注入し、樹脂の硬化完了を待
つ。所定時間の経過後、型を開いて製品を取り出す。2. Description of the Related Art A method called resin transfer molding (hereinafter referred to as RTM) is one of the manufacturing methods for molding a resin molded product by injecting a resin into a mold. This R
A case of molding an FRP product by the TM method will be described with reference to FIG. A convex mold 1 which is usually an upper mold and a concave mold 2 which is usually a lower mold are prepared, the molding portions 3 of both molds are cleaned, and a release agent is applied. Next, the gel coat is sprayed onto the molding portion 3 of the concave mold 2 with a spray gun or the like, and the initial curing of the gel coat is waited for several minutes. Next, a glass mat, which is a reinforcing material for the product, is set on the gel coat, both molds 1 and 2 are closed and the mold is clamped, a resin injection nozzle is attached to the injection port 4 of the upper mold 1, and the injection machine is set. It is operated to inject the resin 9 and wait for the completion of curing of the resin. After a predetermined time has passed, the mold is opened and the product is taken out.
【０００３】前記従来のＲＴＭ工法では、樹脂注入圧力
が低圧なので、ニッケル電鋳型や樹脂型等の機械加工を
必要としない型が使用できる。この成形型は、モデルを
反転して製作するので、安価に製造できる反面、加工精
度が上がらず、凹型１と凸型２を型締めしたとき、それ
らの当接面であるパーティング面Ｐが、成形部３の全周
に亘って０タッチとなる精度が得られない。成形型のパ
ーティング面の隙間は、０．０１〜１．０ｍｍ程度とな
り、ＲＴＭの樹脂の注入圧力は低圧（３〜３０Ｋｇ／ｃ
ｍ2）で行う。In the above-mentioned conventional RTM method, since the resin injection pressure is low, a mold such as a nickel electroforming mold or a resin mold which does not require machining can be used. Since this mold is manufactured by reversing the model, it can be manufactured at low cost, but the processing accuracy does not increase, and when the concave mold 1 and the convex mold 2 are clamped, the parting surface P that is the contact surface between them is However, it is not possible to obtain the accuracy of zero touch over the entire circumference of the molding unit 3. The gap between the parting surfaces of the mold is about 0.01 to 1.0 mm, and the injection pressure of the RTM resin is low (3 to 30 Kg / c).
m 2 ).
【０００４】実開昭６２−１２６９１８号公報には、上
下型により形成されるキャビティの全外周に沿って、微
小幅の食い切り部を介して上型又は下型の一方に凹溝を
形成し、樹脂を注入したときに、キャビティから洩れた
樹脂が凹溝に溜り、密封シール作用を生ずるようにした
成形金型が記載されている。また、実開平３−５７０１
８号公報には、金型のパーティング面にキャビティの外
側を包囲する溝と、同溝に連通する注入口を設け、同溝
内に射出成形機で予め弾性シール材を注入し、金型のパ
ーティング面にシール部材を成形するようにした合成樹
脂用金型が記載されている。In Japanese Utility Model Laid-Open No. 62-126918, a concave groove is formed in one of an upper die and a lower die along a whole outer circumference of a cavity formed by the upper and lower dies through a biting portion having a minute width. There is described a molding die in which the resin leaking from the cavity collects in the concave groove when the resin is injected, and a hermetic sealing action is produced. Also, the actual Kaihei 3-5701
No. 8 discloses that a groove surrounding the outside of the cavity is provided on a parting surface of the mold, and an injection port communicating with the groove is provided, and an elastic sealing material is injected into the groove in advance by an injection molding machine, Describes a mold for synthetic resin in which a sealing member is molded on the parting surface.
【０００５】[0005]
【発明が解決しようとする課題】従来のＲＴＭ成形型
は、パーティング面の隙間が大きく、樹脂注入圧力が低
圧であってもパーティング面から樹脂洩れを起し、成形
部に完全に樹脂が充填されず、いわゆるショートと呼ば
れる成形不良を起す。前記実開昭６２−１２６９１８号
公報に記載された成形型では、キャビティから溢れた樹
脂が成形部の外周の溝に入ってシール作用をするので、
製品の外周に必ずバリが発生し、型から取出した製品
は、仕上げ加工する必要がある。また、前記実開平３−
５７０１８号公報に記載された成形型は、射出成形用の
金型であって、射出成形は、樹脂の注入圧力を高圧（３
００〜１０００Ｋｇ／ｃｍ2）で行うため、高精度の高
価な成形機が必要であり、また、金型のパーティング面
を塞ぐ弾性シール材は、注入樹脂の高圧に耐えるため、
特殊の材料を必要とするだけでなく、金型のパーティン
グ面の隙間が、０．０１〜０．１ｍｍ程度でないと、シ
ール部材で金型のパーティング面を密封することができ
ない。したがって、この技術は、低精度の加工を施した
成形型に低圧で溶融樹脂を注入するＲＴＭに適用するこ
とができない。The conventional RTM mold has a large gap on the parting surface, and resin leaks from the parting surface even if the resin injection pressure is low, so that the resin is completely filled in the molding part. It is not filled and causes a molding defect called a so-called short. In the mold described in Japanese Utility Model Laid-Open No. 62-126918, the resin overflowing from the cavity enters into the groove on the outer periphery of the molding portion to perform a sealing action.
Burrs always occur on the periphery of the product, and the product taken out of the mold must be finished. Also, the actual Kaihei 3-
The mold described in Japanese Patent No. 57018 is a mold for injection molding, and the injection molding uses a resin injection pressure of high pressure (3
Since it is performed at 0 to 1000 Kg / cm 2 ), a highly accurate and expensive molding machine is required, and the elastic sealing material that closes the parting surface of the mold withstands the high pressure of the injected resin.
Not only a special material is required, but also the gap between the parting surfaces of the mold is not about 0.01 to 0.1 mm, the parting surface of the mold cannot be sealed by the seal member. Therefore, this technique cannot be applied to an RTM in which a molten resin is injected at low pressure into a molding die that has been processed with low precision.
【０００７】本発明は、低精度に加工された成形型を使
用し、注入樹脂圧が低く、成形作業も容易で安価に成形
品が得られるＲＴＭの特徴を活かしながら、成形型のパ
ーティング面を密封して成形時における樹脂洩れを無く
し、製品不良の発生を防止することを目的とするもので
ある。The present invention uses a molding die processed with low precision, has a low injection resin pressure, is easy to mold, and can obtain a molded product at a low cost. The purpose of the present invention is to hermetically seal the resin to prevent resin leakage during molding and prevent product defects.
【０００８】[0008]
【課題を解決するための手段】本発明は、分割型の一方
の型のパーティング面に成形部を取囲む凹溝を形成し、
該凹溝に対する樹脂注入口から予め樹脂を注入して前記
凹溝とその周りのパーティング面にシール樹脂体を成形
した後、成形部に樹脂を注入するＲＴＭ成形型のパーテ
ィングシール法である。According to the present invention, a concave groove surrounding a molding portion is formed on a parting surface of one mold of a split mold,
A parting seal method of an RTM molding die in which a resin is injected in advance from a resin injection port for the groove to form a sealing resin body on the groove and a parting surface around the groove, and then the resin is injected into a molding portion. ..
【０００９】[0009]
【作用】予め凹溝に向けて注入された樹脂は、凹溝を溢
れてパーティング面の隙間に少し拡って硬化し、成形部
を取囲むシール樹脂体を形成する。このシール樹脂体
が、成形部に樹脂を注入したときに、パーティング面か
らの樹脂洩れを防止する。The resin previously injected into the concave groove overflows the concave groove and slightly spreads in the gap of the parting surface to be hardened to form a sealing resin body surrounding the molding portion. The sealing resin body prevents the resin from leaking from the parting surface when the resin is injected into the molding portion.
【００１０】[0010]
【実施例】図１、図２は、本発明に使用する成形型の一
部断面図で、図２に示すように、凹型１と凸型２で成形
部３を形成し、凸型２に樹脂注入口４を設ける点は従来
のＲＴＭ成形型と同じである。凹型１のパーティング面
に、成形部３の周りの外側に全周に亘る凹溝５を形成
し、凸型２には、凹溝５に対向する位置に樹脂注入口６
を設ける。凹型１と凸型２を型締めしたパーティング面
Ｐには、０．０１〜１．０ｍｍ程度の隙間がある。1 and 2 are partial sectional views of a molding die used in the present invention. As shown in FIG. 2, a molding portion 3 is formed by a concave mold 1 and a convex mold 2, and a convex mold 2 is formed. The point of providing the resin injection port 4 is the same as that of the conventional RTM mold. On the parting surface of the concave mold 1, a concave groove 5 is formed on the outer side around the molding portion 3 over the entire circumference, and on the convex mold 2, a resin injection port 6 is formed at a position facing the concave groove 5.
To provide. There is a gap of about 0.01 to 1.0 mm on the parting surface P where the concave mold 1 and the convex mold 2 are clamped.
【００１１】図２に示すように、型締めした成形型の樹
脂注入口６に、樹脂注入口４に装着するのと同じ樹脂注
入ノズルを装着し、成形に使用するのと同じ樹脂を極低
圧で注入する。この樹脂は、ポリエステル樹脂を使用す
る場合、成形時の温度が２５℃、粘度が５ポイズ程度の
低粘度であるので、図１に示すように、凹型１に形成し
た凹溝５に入り、ここから溢れた樹脂は、パーティング
面Ｐの隙間に少し拡ってパーティング面Ｐをシールする
樹脂層７が形成される。次に、樹脂注入ノズルを取外し
た樹脂注入口６には、栓８を装着して密封する。樹脂層
７が硬化した後、従来と同様に、樹脂注入口４に樹脂注
入ノズルを装着して成形部３に樹脂を注入すると、パー
ティング面Ｐの隙間がシール樹脂層７でシールされてい
るので樹脂洩れを起すことがない。As shown in FIG. 2, the same resin injection nozzle as that used for the resin injection port 4 is attached to the resin injection port 6 of the mold which has been clamped, and the same resin used for the molding is applied at an extremely low pressure. Inject. When a polyester resin is used, this resin has a low viscosity at the time of molding of 25 ° C. and a viscosity of about 5 poise. Therefore, as shown in FIG. The resin overflowing from the resin spreads slightly in the gap between the parting surfaces P to form a resin layer 7 that seals the parting surfaces P. Next, a plug 8 is attached to the resin injection port 6 from which the resin injection nozzle is removed, and the resin injection port 6 is sealed. After the resin layer 7 is cured, a resin injection nozzle is attached to the resin injection port 4 and resin is injected into the molding unit 3 as in the conventional case, and the gap of the parting surface P is sealed by the seal resin layer 7. Therefore, resin leakage will not occur.
【００１２】以上の実施例では、ＲＴＭについて説明し
たが、低圧で樹脂を成形するレジン・インジェクション
（ＲＩ）にも適用できる。Although the RTM has been described in the above embodiments, it can be applied to resin injection (RI) for molding a resin at a low pressure.
【００１３】[0013]
【発明の効果】本発明は、低精度加工の成形型を使用
し、注入樹脂圧が低く、成形作業も容易で安価に成形品
が得られるＲＴＭの特徴を活かしながら、成形型に僅か
の加工を施すだけで、金型のパーティング面を密封する
ことを可能とし、製品不良の発生を防止することができ
る。INDUSTRIAL APPLICABILITY The present invention uses a molding die of low precision processing, the injection resin pressure is low, the molding work is easy, and a molding product can be obtained at a low cost. It is possible to seal the parting surface of the mold only by applying the above, and it is possible to prevent the occurrence of product defects.
【図１】本発明に使用する成形型のパーティング面シー
ル状態の一部断面図。FIG. 1 is a partial cross-sectional view of a parting surface sealed state of a molding die used in the present invention.
【図２】本発明に使用する成形型の一部断面図。FIG. 2 is a partial cross-sectional view of a molding die used in the present invention.
【図３】従来のＲＴＭ成形型の断面図。FIG. 3 is a sectional view of a conventional RTM mold.
１ 凸型 ２ 凹型 ３ 成形部 ４
樹脂注入口 ５ 凹溝 ６ 樹脂注入口 ７ シール樹脂層 ８
栓 Ｐ パーティング面1 Convex type 2 Concave type 3 Molding part 4
Resin injection port 5 Recessed groove 6 Resin injection port 7 Seal resin layer 8
Plug P Parting surface
Claims (1)
形部を取囲む凹溝を形成し、該凹溝に対する樹脂注入口
から予め樹脂を注入して前記一方の型の凹溝とその周り
のパーティング面にシール樹脂体を成形した後、成形部
に樹脂を注入することを特徴とするＲＴＭ成形型のパー
ティングシール法。1. A split groove is formed on a parting surface of one of the split molds so as to surround a molding portion, and a resin is preliminarily injected from a resin injection port for the recess to form the recessed groove of the one mold and the groove. A parting seal method for an RTM molding die, which comprises molding a sealing resin body on a surrounding parting surface and then injecting a resin into a molding part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3359065A JPH05177658A (en) | 1991-12-30 | 1991-12-30 | Parting seal method of rtm mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3359065A JPH05177658A (en) | 1991-12-30 | 1991-12-30 | Parting seal method of rtm mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05177658A true JPH05177658A (en) | 1993-07-20 |
Family
ID=18462558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3359065A Pending JPH05177658A (en) | 1991-12-30 | 1991-12-30 | Parting seal method of rtm mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05177658A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015014601A1 (en) * | 2013-08-01 | 2015-02-05 | Bayerische Motoren Werke Aktiengesellschaft | Tool for producing fiber-reinforced plastics components in the injection process |
-
1991
- 1991-12-30 JP JP3359065A patent/JPH05177658A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015014601A1 (en) * | 2013-08-01 | 2015-02-05 | Bayerische Motoren Werke Aktiengesellschaft | Tool for producing fiber-reinforced plastics components in the injection process |
| US9944004B2 (en) | 2013-08-01 | 2018-04-17 | Bayerische Motoren Werke Aktiengesellschaft | Tool for producing fiber-reinforced plastics components in the injection process |
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