JPS61171315A - Reaction injection molding process - Google Patents
Reaction injection molding processInfo
- Publication number
- JPS61171315A JPS61171315A JP61013202A JP1320286A JPS61171315A JP S61171315 A JPS61171315 A JP S61171315A JP 61013202 A JP61013202 A JP 61013202A JP 1320286 A JP1320286 A JP 1320286A JP S61171315 A JPS61171315 A JP S61171315A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- liquid
- molding cavity
- mold
- pressure sensor
- 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)
- Molding Of Porous Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、金型の成形キャビティに液状プラスチックを
注入して所要形状の製品ｆ：得る反応射出成形方法に関
し、更に詳しくは、上記成形キャビティ内の液状プラス
チック（以下原液という）の固化に伴う収Ｊｌ！ｆｉｍ
補正する反応射出成形方法に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a reaction injection molding method for obtaining a product f in a desired shape by injecting liquid plastic into a molding cavity of a mold. Jl! fim
The present invention relates to a corrected reaction injection molding method.
一般に１反応射出成形方法は、高圧で”衝突混合させた
複数の原液を金型の成形キャビティ内に注入するととも
に、原液の重合反応により合成樹脂を生成して固化する
ことにより、所要形状の製品を得るものである。In general, the one-reaction injection molding method involves injecting multiple stock solutions that have been collision-mixed under high pressure into the molding cavity of a mold, and then producing a synthetic resin through a polymerization reaction of the stock solutions and solidifying the product into the desired shape. This is what you get.
ところで、上記Ｍ液にはポリウレタンのように通常発泡
剤を入れて使用するものと、ナイロンのように通常発泡
剤を入れずに使用するものとがあり、発泡剤を使用しな
い原液の場合には、原液の重合反応時における収縮に起
因して製品円部に真空気泡が生じたり、＊悪の場合には
製品の表面にでこぼこが生じたりした。そしてそれを防
ぐために、原液を注入した後、この原液がまだ完全に固
化しないうちに、原液注入用のプランジャを作動して成
形キャビティに通じるランナ部の液状プラスチックを成
形キャビティに送り、上記のような収縮ヲ補うことが行
われている。By the way, there are two kinds of liquid M, such as polyurethane, which is usually used with a foaming agent, and nylon, which is usually used without a foaming agent. Vacuum bubbles were generated in the circular part of the product due to contraction during the polymerization reaction of the stock solution, and in worse cases, unevenness was generated on the surface of the product. In order to prevent this, after injecting the stock solution and before it completely solidifies, the plunger for stock solution injection is activated to send the liquid plastic in the runner section leading to the molding cavity into the molding cavity as described above. Compensation for the shrinkage is being carried out.
しかしながら、上記のような従来の技術においては次の
ような問題点がめった。However, the following problems have been encountered in the conventional techniques as described above.
すなわち１反応射出成形においては使用される原液のａ
ｇ４によって鷹合反応時の体積の変化状態が異なり、収
縮するもの、膨張するもの、体積が変わらないもの、あ
るいは発熱して昇温し、その影響で膨張するもの、また
は一度膨張して収縮するものなど櫨々のものがあり、加
圧もそれに応じた細め）い制御がなされることか望まし
い。しかし、通常成形キャビティは一つの金型、あるい
は一つの注入用プランジャに対して複数形成されており
、従って、その固化状況も均一でなく、また、注入用プ
ランジャからの圧力も各成形キャビティに均一に作用し
ない。そこで各成形キャビテイ毎に適確なタイミングで
適当な加圧を行うことが困雌であり、たとえ各成形キャ
ビティに圧力センサなどを設けても、上述した製品の不
良を充分に防止することができなかった。In other words, in one-reaction injection molding, a of the stock solution used is
The state of change in volume during the hawking reaction differs depending on g4: some shrink, some expand, some have no change in volume, some generate heat and rise in temperature and expand under the influence, or some expand and then contract. There are various types of pressure, and it is desirable that the pressure be controlled accordingly. However, usually multiple molding cavities are formed for one mold or one injection plunger, so the solidification status is not uniform, and the pressure from the injection plunger is also uniform for each molding cavity. does not work. Therefore, it is difficult to apply appropriate pressure to each molding cavity at the appropriate timing, and even if each molding cavity is equipped with a pressure sensor, it is not possible to sufficiently prevent the above-mentioned product defects. There wasn't.
本発明は、金型の成形キャビティに液状プラスチックを
注入して所要形状の製品′ｆ：得る反応射出成形方法に
おいて、上記金型に、上記成形キャビティ内の圧力全検
知する圧力センサーと、上記成形キャビティに４通する
液溜りと、該液溜り内の液状プラスチックを加圧する加
圧装置とを設け、上記成形キャビティとａ馨りに液状プ
ラスチックを注入した後、予め設定した圧力値と上記圧
力センサーの検知値を比較しながら上記加圧装置を作動
させて上記成形キャビティ内の圧力を制御するようにし
たことにより、上記従来の開祖をなくしたもので、原液
の固化ζこ伴う収縮による製品内部の真空気泡をなくＴ
ことができ、しかも表面の仕上り状態を良好にできる上
、製品の寸法精度も同上できる反応射出成形方法を提供
するものである。The present invention provides a reaction injection molding method for obtaining a product of a desired shape by injecting liquid plastic into a molding cavity of a mold, in which a pressure sensor is installed in the mold to detect the total pressure inside the molding cavity; The cavity is provided with four liquid reservoirs and a pressurizing device that pressurizes the liquid plastic in the liquid reservoir, and after injecting the liquid plastic into the molding cavity and the hole a, a preset pressure value and the pressure sensor are provided. By controlling the pressure inside the molding cavity by operating the pressure device while comparing the detected values of Eliminate vacuum bubbles
The purpose of the present invention is to provide a reaction injection molding method that can improve the surface finish as well as the dimensional accuracy of the product.
以下、本発明を図面を参照して説明する。 Hereinafter, the present invention will be explained with reference to the drawings.
第１図は１本発明を冥厖する装置の機械部分を示すもの
で、ｌは金型である。この金型１の外部には、複数の原
液の衝突混合やその停止をなす混合へラド２が設けられ
るとともに内部には、成形キャビティ３か形成されてい
る。また、この成形キャビティ３と上記混合ヘッド２の
間の金ｆ！ｌｉ１の内部には、流路４が設けられるとと
もにこの流路４と成形キャビティ３との間には、ランナ
５が形成され、上記混合ヘッド２で衝突混合された原液
を流路４を通ってランナ５を介し、成形キャビティ３内
に注入するようになっている。FIG. 1 shows a mechanical part of an apparatus embodying the present invention, and l is a mold. A mixing chamber 2 for colliding and mixing a plurality of stock solutions and stopping the mixing is provided on the outside of the mold 1, and a molding cavity 3 is formed inside. Moreover, the gold f! between this molding cavity 3 and the above-mentioned mixing head 2! A flow path 4 is provided inside the li1, and a runner 5 is formed between the flow path 4 and the molding cavity 3, and a runner 5 is formed to pass the stock solution collided and mixed by the mixing head 2 through the flow path 4. It is injected into the molding cavity 3 via the runner 5.
一方、上記ランナ５には、上記成形キャビティ３に連通
ずる円筒状の液溜り人が設けられており、この液溜り人
には、原液の固化に伴う収縮分を補充するに足る原液を
注入できるようになっている。On the other hand, the runner 5 is provided with a cylindrical liquid reservoir that communicates with the molding cavity 3, into which enough stock solution can be injected to replenish the shrinkage due to solidification of the stock solution. It looks like this.
また、上記液滴りＡには、上記金型１の外部に設けられ
た油圧装置等の加圧装置６によって液溜りＡ内を摺動自
在に移動するプランジャ７が設けられている。なお、こ
のプランジャ７の中心線は上記金型１のパーティングラ
インと同−線上に位置するようになっており、プランジ
ャ７と液溜りＡ内を清掃し易くしている。また上記液溜
り人は、ランナ５に設けるものに限らず、第１ｍ：点？
Ａ線に示すように成形キャビティ３の先端（流路４から
最も離れたところ）に設けても良い。そして成形キャビ
ティ３の先端に設けた場合においては、プランジャ７お
よび加圧装置Ｈも、液藺りＡの位置に従って、図の二点
ｇｍの位置に設けられることは言うまでもない。Further, the liquid droplet A is provided with a plunger 7 that is slidably moved within the liquid pool A by a pressurizing device 6 such as a hydraulic device provided outside the mold 1. The center line of the plunger 7 is located on the same line as the parting line of the mold 1, making it easy to clean the plunger 7 and the inside of the liquid reservoir A. In addition, the liquid reservoir mentioned above is not limited to the one provided on the runner 5, but the 1st m: point?
It may be provided at the tip of the molding cavity 3 (the farthest point from the flow path 4) as shown in line A. When provided at the tip of the molding cavity 3, it goes without saying that the plunger 7 and the pressurizing device H are also provided at the two points gm in the figure in accordance with the position of the liquid lining A.
上記金型１の一部には、第２図に示すように成形キャビ
ティ３の成形圧力を測定できる圧力センサー２０が設け
られ、加圧装置６には油圧ポンプ２１７’Ｊｘらの油圧
が電気式圧力調整弁２２を介してかけられるようになっ
ている。上記電気式圧力調整弁２２は圧力センサー２０
からの電気信号を電気制御部２３を介して検知し１作＠
することによって金型１内の圧力ｆ：調整するようにな
っている。A part of the mold 1 is provided with a pressure sensor 20 that can measure the molding pressure of the molding cavity 3, as shown in FIG. The pressure can be applied via a pressure regulating valve 22. The electric pressure regulating valve 22 is a pressure sensor 20
The electric signal from the
By doing so, the pressure f inside the mold 1 is adjusted.
また上記電気制御部２３には圧力設定器２４が組み込ま
れており、この圧力設定器２４の設定圧力の態様として
は、第３図（イ）〜（イ）に示すものがある。Further, a pressure setting device 24 is incorporated in the electric control section 23, and the setting pressure of this pressure setting device 24 is as shown in FIGS. 3(A) to 3(A).
例えば、第３図（ホ）のように設だ圧力を選択すると、
圧力は時間に比例して上がり、また４３図（ロ）のよう
に設定圧力を選択すると、圧力は一定時間毎に上がる。For example, if you select the set pressure as shown in Figure 3 (e),
The pressure increases in proportion to time, and if the set pressure is selected as shown in Figure 43 (b), the pressure increases at regular intervals.
そしてこれらの設定圧力の態様は製品の形状やＪ！Ｋｍ
の種類によって選定される。The configuration of these set pressures depends on the shape of the product and J! Km
The selection is made according to the type of
金型ｌの成形キャビティ３に原０１０を注入して所要形
状の製品を得るには、混合へラド２の中で衝突混合した
原ｇ１０を流路４ｔ−通すとともにランナ５ｔ−介して
成形キャビティ３と液溜り人に注入する。そして原液１
０の注入終了後、原液１０が流動性を有する間に、液溜
りＡ内の原液１０を加圧装置６を作動させて、プランジ
ャ７を成形キャビティ３の方向へ動かすことにより、加
圧し、成形キャビティ３内の原液ｌＯの固化に伴う収縮
を液溜りＡ内の原液１０によって補正する。このときの
加圧圧力は次のように制御される。In order to inject raw material 010 into the molding cavity 3 of the mold l to obtain a product with a desired shape, the raw material g10 that has been collided and mixed in the mixing spatula 2 is passed through the flow path 4t and passed through the runner 5t to the molding cavity 3. and inject the liquid into the person. And stock solution 1
0, while the stock solution 10 has fluidity, pressurize the stock solution 10 in the liquid pool A by operating the pressurizing device 6 and moving the plunger 7 in the direction of the molding cavity 3. The contraction of the stock solution 10 in the cavity 3 due to solidification is compensated by the stock solution 10 in the liquid reservoir A. The pressurizing pressure at this time is controlled as follows.
いま、圧力設定６２４に第３図（イ）に示すように。Now, set the pressure 624 as shown in FIG. 3(a).
一定圧力Ｐｓｔ？設定して３く。このようにした後、金
型１円に原液１０を注入すると、ＩＩＸ液１０は当初、
一定圧力Ｐ２となっているが、原１［１０の収縮ととも
に、金型１内の圧力Ｐ２は低下していく。Constant pressure Pst? Set and go to 3. After doing this, when the stock solution 10 is poured into a mold of 1 yen, the IIX solution 10 initially becomes
Although the pressure P2 is constant, the pressure P2 inside the mold 1 decreases as the base 1 [10 shrinks.
この際、金型１円の圧力Ｐ２は、常時、圧力センサー２
０によって電気的に検出されて葛り、また電気制御部２
３が、圧力設定器２４の設定圧力Ｐ！と金型１内の圧力
Ｐ２とを比較しているため、Ｐｉ＞Ｐｚならば、液溜り
Ａ内の原液１０を加圧するように、ＩＩＥ気制御部２３
から電気信号が電気式圧力ａ４ｆｉ弁２２に送られ、逆
にＰＩ＜Ｐ２ならば金型１内の圧力Ｐ２を下げるように
ｔＩＬ気信号が送られて、常にＰ ｌ＝Ｐ ２になるよ
うにフィードバック制御される。At this time, the pressure P2 of 1 yen of the mold is always the pressure sensor 2
It is electrically detected by 0, and the electrical control section 2
3 is the set pressure P of the pressure setting device 24! Since the pressure P2 in the mold 1 is compared with the pressure P2 in the mold 1, if Pi>Pz, the IIE air control unit 23 is configured to pressurize the stock solution 10 in the liquid pool A.
An electric signal is sent to the electric pressure a4fi valve 22, and conversely, if PI<P2, a tIL signal is sent to lower the pressure P2 in the mold 1 so that P l = P 2 at all times. Feedback controlled.
なお、最初に膨張し、徐々に収縮するような原液に対し
ては、ｓ３図（ホ）に示すように、最初に圧力を低くし
ておき、徐々に上げていくような制御方式が採られる。For stock solutions that initially expand and then gradually contract, a control method is adopted in which the pressure is initially kept low and then gradually raised, as shown in Figure s3 (E). .
また、発泡剤を使用した場合などにおいては、固化の初
期における製品の表面付近での発泡を防ぐため、第３図
に）、（へ）あるいは（ト）のように初期に圧力を高く
するような制御方式が有効である。In addition, when using a foaming agent, in order to prevent foaming near the surface of the product at the initial stage of solidification, it is recommended to increase the pressure at the initial stage as shown in Figure 3), (F), or (G). A control method is effective.
以上詳述したように１本発明は、金型の成形キャビティ
に液状プラスチックを注入して所要形状の製品を得る反
応射出成形方法において、上記金型に、上記成形キャビ
ティ内の圧力を検知する圧力センサーと、上ｄピ成形キ
ャビティに連通ずる液溜りと、該液溜り内の液状プラス
チックを加圧する加圧装置とを設け、上記成形キャビテ
ィと液溜りに液状プラスチックを注入した後、予め設定
した圧力値と上記圧力センサーの検知値を比較しながら
上記加圧装置を作動させて上記成形キャビティ内の圧力
を制御するようにしたので、原液の性状に応じた細かい
圧力制御が行え、また、成形キャビティが一つの金型に
複数配設された場合においても各成形キャビテイ毎に圧
力制御が行える。As detailed above, one aspect of the present invention is to provide a reaction injection molding method for obtaining a product having a desired shape by injecting liquid plastic into a molding cavity of a mold. A sensor, a liquid reservoir communicating with the upper D-pi molding cavity, and a pressurizing device for pressurizing the liquid plastic in the liquid reservoir are provided, and after the liquid plastic is injected into the molding cavity and the liquid reservoir, a preset pressure is applied. The pressure inside the molding cavity is controlled by operating the pressure device while comparing the value detected by the pressure sensor with the value detected by the pressure sensor. Even when a plurality of molding cavities are arranged in one mold, the pressure can be controlled for each molding cavity.
それにより、原液の重合反応時に２ける体積変化に起因
する製品の内部あるいは表面の欠陥を防止することがで
き、また製品の寸法ｎ１度も向上できるなどの優れた効
果を奏するものである。Thereby, it is possible to prevent defects inside or on the surface of the product due to the volume change during the polymerization reaction of the stock solution, and also to improve the dimension n1 degree of the product.
第１図は本発明の実施に用いられる金型の一例の概略図
、第２図は金型と電気式圧力ＩＡ整弁珍との関係を示す
説明図、第３図ピ）〜（１）は圧力設定器の設定圧力の
時間的変化を示したグラフである。
ｌ・・・・・・金型、３・・・・・・成形キャビティ、
７・・・・・・プランジャ、１０・・・・・・原液、２
０・・・・・・圧力センサー、２２・・・・・・電気式
圧力ａ１１姫弁、２３・・・・・・電気制御部。
２４・・・・・・圧力設定器、Ａ・・・・・・液溜り。
第１図
第２図
第３図Fig. 1 is a schematic diagram of an example of a mold used in the implementation of the present invention, Fig. 2 is an explanatory diagram showing the relationship between the mold and an electric pressure IA adjustment valve, and Fig. 3 P) to (1) is a graph showing temporal changes in the set pressure of the pressure setting device. l... Mold, 3... Molding cavity,
7... Plunger, 10... Stock solution, 2
0...Pressure sensor, 22...Electric pressure a11 princess valve, 23...Electric control unit. 24...Pressure setting device, A...Liquid pool. Figure 1 Figure 2 Figure 3
Claims (1)
要形状の製品を得る反応射出成形方法において、上記金
型に、上記成形キャビティ内の圧力を検知する圧力セン
サーと、上記成形キャビティに連通する液溜りと、該液
溜り内の液状プラスチックを加圧する加圧装置とを設け
、上記成形キャビティと液溜りに液状プラスチックを注
入した後、予め設定した圧力値と上記圧力センサーの検
知値を比較しながら上記加圧装置を作動させて上記成形
キャビティ内の圧力を制御することを特徴とする反応射
出成形方法。In a reaction injection molding method in which a product having a desired shape is obtained by injecting liquid plastic into a molding cavity of a mold, the mold includes a pressure sensor that detects the pressure inside the molding cavity, and a liquid reservoir communicating with the molding cavity. and a pressurizing device that pressurizes the liquid plastic in the liquid reservoir, and after injecting the liquid plastic into the molding cavity and the liquid reservoir, the pressure is increased while comparing a preset pressure value with the detected value of the pressure sensor. A reaction injection molding method characterized in that the pressure inside the molding cavity is controlled by operating a pressure device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61013202A JPS61171315A (en) | 1986-01-24 | 1986-01-24 | Reaction injection molding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61013202A JPS61171315A (en) | 1986-01-24 | 1986-01-24 | Reaction injection molding process |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8551282A Division JPS58201627A (en) | 1982-05-20 | 1982-05-20 | Reactive injection molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61171315A true JPS61171315A (en) | 1986-08-02 |
| JPH0317654B2 JPH0317654B2 (en) | 1991-03-08 |
Family
ID=11826569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61013202A Granted JPS61171315A (en) | 1986-01-24 | 1986-01-24 | Reaction injection molding process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61171315A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014111372A (en) * | 2012-12-04 | 2014-06-19 | Hennecke Gmbh | Method and apparatus for manufacturing molding part |
| JP2014517782A (en) * | 2011-05-27 | 2014-07-24 | スネクマ | Pressure maintenance device and associated method for making composite components by injecting resin |
| JP2019084788A (en) * | 2017-11-09 | 2019-06-06 | トヨタ紡織株式会社 | Molding apparatus, and method for manufacturing fiber reinforced resin molded product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5464557A (en) * | 1977-11-01 | 1979-05-24 | Otsuka Hidemitsu | Injection molding method with mechanism using increased cavity internal pressure |
| JPS55103938A (en) * | 1979-02-02 | 1980-08-08 | Hitachi Ltd | Forming device for plastic hinge |
-
1986
- 1986-01-24 JP JP61013202A patent/JPS61171315A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5464557A (en) * | 1977-11-01 | 1979-05-24 | Otsuka Hidemitsu | Injection molding method with mechanism using increased cavity internal pressure |
| JPS55103938A (en) * | 1979-02-02 | 1980-08-08 | Hitachi Ltd | Forming device for plastic hinge |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014517782A (en) * | 2011-05-27 | 2014-07-24 | スネクマ | Pressure maintenance device and associated method for making composite components by injecting resin |
| JP2014111372A (en) * | 2012-12-04 | 2014-06-19 | Hennecke Gmbh | Method and apparatus for manufacturing molding part |
| JP2019084788A (en) * | 2017-11-09 | 2019-06-06 | トヨタ紡織株式会社 | Molding apparatus, and method for manufacturing fiber reinforced resin molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0317654B2 (en) | 1991-03-08 |
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