JPH1142647A - Plastic molding method and mold - Google Patents

Plastic molding method and mold

Info

Publication number
JPH1142647A
JPH1142647A JP21708697A JP21708697A JPH1142647A JP H1142647 A JPH1142647 A JP H1142647A JP 21708697 A JP21708697 A JP 21708697A JP 21708697 A JP21708697 A JP 21708697A JP H1142647 A JPH1142647 A JP H1142647A
Authority
JP
Japan
Prior art keywords
molding cavity
pressure
molding
material inlet
cavity
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
Application number
JP21708697A
Other languages
Japanese (ja)
Inventor
Koichi Araki
公一 荒木
Masahiko Suzuki
政彦 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiei Sales & Engineering Corp
TAIEI SHOKO KK
Original Assignee
Taiei Sales & Engineering Corp
TAIEI SHOKO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taiei Sales & Engineering Corp, TAIEI SHOKO KK filed Critical Taiei Sales & Engineering Corp
Priority to JP21708697A priority Critical patent/JPH1142647A/en
Publication of JPH1142647A publication Critical patent/JPH1142647A/en
Pending legal-status Critical Current

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

PROBLEM TO BE SOLVED: To provide a plastic molding method not generating cavities in a molded product because air sumps are generated in a molding cavity part to easily generate an inferior molded product in a plastic molding method for filling a mold with a flowable material while sucking from one side of the mold or exhusting from the gap of the mold, and a mold adapted thereto. SOLUTION: In a plastic molding method molded object is formed by the molding cavity part 2 formed to an engaged part with a flowable material from a material inlet 4 by a plurality of mold members 1A, 1B and, further, a pressure means 7 is arranged to one or more pressure port 5 formed in a region separate from the material inlet 4 and the pressure in the molding cavity part 2 is partially arbitrally controlled to fill the flowable material from the material port 4 to mold the same. A molding cavity part 2 is formed to the engaging part by a plurality of the mold members 1A, 1B in a mold 1 and an annular introducing path 3 is formed to the base end peripheral part of the mold cavity part 2 approaching the material inlet 4 and the flowable material introduced from the material inlet 4 is filled into the annular introducing path 3 to fill the molding cavity part 2 from the periphery.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明はプラスチック成形
方法並びに成形型に係り、特に製造した成形品に巣の生
じないプラスチック成形方法並びに成形型に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic molding method and a molding die, and more particularly, to a plastic molding method and a molding die which do not cause nests in a produced molded product.

【0002】[0002]

【従来の技術】一般に成形型の成形空洞部内に一方から
流動性素材を加圧注入させ、他方で吸引脱気する方法が
知られ、或いはFRPの成形方法で、例えばコールドプレ
ス法であれば、上下型を開けて素材を充填し、圧力をか
けて上下型の合わせ目から内部の空気を抜いている。SM
C(シートモールデイングコンパウンド)法も同様でで
ある。RTM(レジントランスファモールデイング)法は
一点或いは多点から流動性素材を注入し、型の周辺合わ
せ目から空気を抜いている。RIV法(レジンインジェク
ションバキューム)も一点ないし多点から流動性素材を
注入し、一点ないし多点から吸引している。
2. Description of the Related Art In general, a method is known in which a fluid material is pressure-injected from one side into a molding cavity of a molding die, and suction and deaeration is performed on the other side. The upper and lower molds are opened to fill the material, and pressure is applied to release the internal air from the joints of the upper and lower molds. SM
The same applies to the C (sheet molding compound) method. In the RTM (resin transfer molding) method, a flowable material is injected from one or more points, and air is evacuated from a joint around the mold. In the RIV method (resin injection vacuum), a fluid material is injected from one or more points, and suction is performed from one or more points.

【0003】[0003]

【発明が解決しようとする課題】前記従来方法において
は、流動性素材は吸引脱気による負圧によリ成形空洞部
内での流動が良くなる反面、流動性素材の流動速度が早
いために隅部に気溜りが生じて、成形後において気溜り
による巣が生じて不良品となる難点があった。また、FR
P製品においては、流動性素材の流動速度が早い場合に
は、ガラス繊維間の間隙に流動性素材が入りにくいこと
から巣が生じるという難点があった。型の周囲から内部
の空気を抜く方法は、逆にいえば型に隙間があるという
ことで、型の隙間から素材が流出しやすく、又、空気も
侵入しやすく、成形空洞部の内圧が不安定でいずれも完
璧な製品の期待は困難であった。この発明はそのような
難点を解消するため永年にわたって成形空洞部内の圧力
に注目して研究を重ねてきた結果、成形品に巣のできな
いプラスチック成形方法並びに成形型を開発するに至っ
た。
In the above-mentioned conventional method, the flowability of the flowable material in the reforming cavity is improved by the negative pressure due to the suction and deaeration, but the flowability of the flowable material is high. There was a drawback that air pockets were formed in the portions and nests were formed after the air pockets were formed, resulting in defective products. Also, FR
In the case of the P product, when the flow rate of the flowable material is high, there is a problem that nests are formed because the flowable material is less likely to enter the gaps between the glass fibers. Conversely, the method of bleeding the internal air from around the mold is that the mold has a gap, which makes it easier for the material to flow out of the gap in the mold and for air to easily enter, and the internal pressure of the molding cavity is not reduced. It was difficult to expect stable and perfect products. The present invention has been studied for many years with a focus on the pressure in the molding cavity in order to solve such difficulties, and as a result, has developed a plastic molding method and a molding die that do not allow a molded product to nest.

【0004】[0004]

【課題を解決するための手段】この発明は前記課題を解
決し目的を達成するために次のような技術的な手段を講
じた。ここでいう複数の型部材とは、型部材が二っに分
離するものに限定されるものではなく、複雑な製品形状
に対応して複数に分離し、或いは内部に中子を配設する
ものも含まれている。また一っ以上の加圧口とは、排気
口兼用で加圧口が一っでもよいが、複雑な成形品を成形
する場合、成形空洞部の位置によって内圧が異なってく
るので、全域の内圧をコントロールするために必要な箇
所に加圧口を形成するものをさしている。
The present invention employs the following technical means in order to solve the above problems and achieve the object. The term “plurality of mold members” as used herein is not limited to those in which the mold members are separated from each other, but includes those in which a plurality of mold members are separated according to a complicated product shape, or a core is disposed inside. Is also included. The one or more pressurizing ports may be the same as the exhaust port, and the pressurizing port may be the same.However, when molding a complicated molded product, the internal pressure varies depending on the position of the molding cavity. A pressurized port is formed at a location necessary to control the pressure.

【0005】従来の脱気を伴う方法においては、成形空
洞部内が負圧になることを利用して流動性素材を注入さ
せている場合、成形空洞部内における主通路を流動性素
材が流れ易いが、枝路や角隅部においては、隅々まで流
動性素材が入らないうちに流動性素材が流動してしまっ
て気溜りが生じる。これを解消するためには流動性素材
がゆっくリ空洞部内に入ること、並びに全域に同じ圧力
で入ることが望ましい。また、FRP製品成形において
は、ガラス繊維間の微細な間隙に表面張力、毛管現象が
スムースに行われるためには外圧が高いことが望まれ
る。これには、前記のように型の隙間から空気や素材の
流出があるものは好ましくない。それら手段として次の
二っがある。
In the conventional method involving degassing, when the flowable material is injected by utilizing the negative pressure in the molding cavity, the flowable material easily flows through the main passage in the molding cavity. In a branch or a corner, the flowable material flows before the flowable material enters all the corners, resulting in air pockets. In order to solve this, it is desirable that the fluid material slowly enter the cavity and that the entire region enter with the same pressure. Also, in the molding of FRP products, it is desired that the external pressure is high in order to smoothly perform the surface tension and the capillary action in the minute gap between the glass fibers. It is not preferable that the air or the material flows out from the gap of the mold as described above. There are the following two means.

【0006】複数の型部材を組立てて形成された成形空
洞部に材入口から流動性素材を充填して成形体を形成す
る方法において、材入口とは別部位に形成された一っ以
上の加圧口にそれぞれ加圧手段を配設し、流動性素材に
かけられている圧力と常圧との間で、成形空洞部の部位
内圧をコントロールさせながら材入口から流動性素材を
充填させて成形するプラスチック成形方法。この場合、
加圧手段により、流動性素材の圧力を利用して成形空洞
部内圧をコントロールする場合と、加圧手段により積極
的に加圧流動体を成形空洞部に注入して成形空洞部内圧
をコントロールする方法とがある。複雑な形状の成型空
洞部に対しては好ましい位置に形成した各加圧口から、
これに連通する内部の部位内圧を好ましい条件にコント
ロールすることにより、全体としてコントロールする。
In a method for forming a molded body by filling a flowable material into a molding cavity formed by assembling a plurality of mold members from a material inlet, one or more molds formed at a portion different from the material inlet are formed. A pressurizing means is provided at each of the pressure ports, and between the pressure applied to the fluid material and the normal pressure, the fluid material is filled from the material inlet and molded while controlling the internal pressure of the molding cavity. Plastic molding method. in this case,
The pressure means controls the internal pressure of the molding cavity using the pressure of the fluid material, and the pressure means actively controls the internal pressure of the molding cavity by injecting a pressurized fluid into the molding cavity. There is a way. For the molded cavity of complicated shape, from each pressurized port formed at a preferred position,
By controlling the internal pressure in the internal part communicating with this to a preferable condition, the whole is controlled.

【0007】複数の型部材で形成された成形空洞部に材
入口から流動性素材を充填して成形体を形成する方法に
おいて、材入口に接する成形空洞部の基端周部に形成さ
れた、成形空洞部と近接する環状導入路に流動性素材を
環状に充満させてから成形空洞部内に充填させて成形す
るプラスチック成形方法。この場合、環状導入路に流動
性素材を充満させたとき、外方へ漏れる流動性素材は、
パッキンを濡らすため、気体が型外方へ漏れることを完
全に防止し、成形空洞部内圧をどの製品に対しても常に
安定化させることができる。また、環状導入路に流動性
素材を充満させることによって、パスカルの原理(液体
を容器中に密閉し、この一部に圧力を加えたとき、液体
を粘性、圧縮性を無視した完全液体と仮定すると、圧力
はすべての部分にそのまま伝わる)に従って、成形空洞
部に外周から同時に同じ圧力で流動性素材が充填され
る。
In a method of forming a molded body by filling a flowable material from a material inlet into a forming cavity formed by a plurality of mold members, the method comprises forming a molding at a base end peripheral portion of the forming cavity in contact with the material inlet. A plastic molding method in which a flowable material is annularly filled with an annular introduction path adjacent to a molding cavity and then filled into the molding cavity to be molded. In this case, when the annular introduction path is filled with the flowable material, the flowable material that leaks outward is
Since the gasket is wet, the gas is completely prevented from leaking out of the mold, and the internal pressure of the molding cavity can be always stabilized for any product. Also, by filling the annular introduction path with a fluid material, the principle of Pascal (when liquid is sealed in a container and pressure is applied to a part of this, the liquid is assumed to be a complete liquid neglecting viscosity and compressibility Then, the molding material is filled with the fluid material from the outer periphery at the same pressure at the same time.

【0008】上記の二っの手段を併用するプラスチック
成形方法と成形型。並びに加圧口に圧力制御器を連設
し、自動制御器を圧力制御器と素材注入手段とに電気的
接続をして、圧力制御器と素材注入手段とを制御して成
形空洞部の部位的内圧を自動コントロールするように構
成した成形方法と成形型。
[0008] A plastic molding method and a mold using the above two means in combination. In addition, a pressure controller is connected to the pressurizing port, an automatic controller is electrically connected to the pressure controller and the material injection means, and the pressure controller and the material injection means are controlled to control a portion of the molding cavity. Molding method and mold that automatically control the target pressure.

【0009】[0009]

【作用】上記のように構成されたこの発明は次のような
作用を有している。
The present invention configured as described above has the following functions.

【0010】1.加圧口に加圧手段を配設し、流動性素
材にかけられている圧力と常圧の間で成形空洞部の部位
的内圧を制御させると、流動性素材は進行が妨げられる
と流動速度が遅くなり、圧力の弱い処を探しながら進行
する。また、所によっては流動性素材の進行が早められ
て普通では入りにくい隘路にも入りやすくなる。従って
成形空洞部の部位的内圧をコントロールしながら流動性
素材を注入すると流動性素材が、徐々に空洞部内の空気
を加圧口から外へ押し出して成形空洞部内全域並びにガ
ラス繊維間によく行きわたり、製品に巣が生じることが
防止される。この場合、流動性素材と加圧口の圧力を強
弱交互に切り替えてコントロールすることによって粘性
の高い流動性素材でも容易に完全に充填させることがで
きる。
[0010] 1. A pressurizing means is provided in the pressurizing port to control the local internal pressure of the molding cavity between the pressure applied to the flowable material and the normal pressure. It slows down and proceeds while looking for a place with low pressure. Further, in some places, the flow of the fluid material is accelerated, and it is easy to enter a bottleneck which is difficult to enter normally. Therefore, when the fluid material is injected while controlling the internal pressure in the molding cavity, the fluid material gradually pushes out the air in the cavity from the pressurization port and spreads well throughout the molding cavity and between the glass fibers. This prevents the product from nesting. In this case, the fluid material and the pressure of the pressurizing port are alternately switched between strong and weak to control the fluid material with high viscosity so that it can be easily and completely filled.

【0011】2.成形空洞部の基端部において周部に形
成された成形空洞部に近接する環状導入路を介して流動
性素材を充填すると、同じ圧力で成形空洞部の周部から
遅い速度で成形空洞部内に流動性素材が流入して行くの
で成形空洞部内の隅々にも流動性素材が十分に行きわた
る。
2. At the base end of the molding cavity, the fluid material is filled through the annular introduction passage close to the molding cavity formed in the periphery, and at the same pressure from the periphery of the molding cavity at a slow speed into the molding cavity. Since the flowable material flows in, the flowable material sufficiently spreads to every corner in the molding cavity.

【0012】3.自動制御器によって素材注入手段と加
圧口に連設した圧力制御器を制御して成形空洞部内圧を
自動制御することによって、成形空洞部内に流動性素材
を最良の条件で充填させる事ができる。
3. By automatically controlling the internal pressure of the molding cavity by controlling the material injection means and the pressure controller connected to the pressurizing port by the automatic controller, the molding material can be filled with the flowable material under the best conditions. .

【0013】[0013]

【発明の実施の形態】この発明の実施の形態例を図面を
参照して説明する。図1は成形型の中央縦断面図。図2
はII型の平面図である。図において成形型1はI型1
A、II型1Bで一対となり、その係合内部に成形空洞
部2が形成されている。該成形空洞部2の基端部におい
て、II型1Bには成形空洞部2の周部と近接するよう
に環状導入路3が形成され、環状導入路3から外方へ向
けて材入口4が形成されている。I型1Aにおいて、成
形空洞部2から上方へ向けて加圧口5が形成されてい
る。図中符号6はガイド、7は加圧流動体を成形空洞部
2に注入する加圧手段、8は素材注入手段、1Cはパッ
キンである。前記素材注入手段8は、素材の自重を利用
するものでもよいし、機械的加圧手段を有するものでも
よい。
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a central longitudinal sectional view of a molding die. FIG.
FIG. 2 is a plan view of a type II. In the figure, a mold 1 is an I-type 1
A and II types 1B are paired, and a molding cavity 2 is formed inside the engagement. At the base end of the molding cavity 2, an annular introduction path 3 is formed in the type II 1B so as to be close to the periphery of the molding cavity 2, and a material inlet 4 is provided outward from the annular introduction path 3. Is formed. In the I-type 1A, a pressurizing port 5 is formed upward from the molding cavity 2. In the figure, reference numeral 6 denotes a guide, 7 denotes a pressurizing means for injecting a pressurized fluid into the molding cavity 2, 8 denotes a material injecting means, and 1C denotes a packing. The material injection means 8 may use the own weight of the material, or may have mechanical pressure means.

【0014】上記構成において、材入口4から流動性素
材を例えば常圧プラス0.5kg/平方cmで充填させ
るに先立って加圧口5から圧縮空気或いは圧縮ガス等の
加圧流動体を、例えば加圧口5がいくつかある場合、成
形品の内容に応じて0.1kg/平方cmないし0.1
5kg/平方cmなどに調整しておくと、加圧流動体よ
りも高い圧力をもっている流動性素材は成形空洞部2内
の圧力の弱い処を探しながらゆっくりと進み、加圧流動
体を加圧口5へと押し出していき、成形空洞部2内全域
に充填される。従って成形品に巣が生じない。前記環状
導入路3の外周部にパッキン1Cが配設されているの
で、環状導入路3に流動性素材が充満されて外方向へ漏
れてもパッキン1Cで制止され、かつパッキン1Cが濡
れることからパッキン作用が完全となり成形空洞部2か
ら素材や空気が型外に漏れることがなくなり、内圧が安
定化される。また環状導入路3に流動性素材を充満させ
てから成形空洞部2に流動性素材を充填させることによ
り、パスカルの原理によって、成形空洞部2の周部から
同時に同圧で流動性素材が入るため、流動性素材の部分
的な早掛け遅足が生じず、製品に巣が生じにくい。この
場合、成形する物品や形状によって、環状導入路3のな
い成形型での加圧流動体の使用だけでも巣の生じない製
品の製造をすることができる。また加圧流動体を使用し
なくても、環状導入路3の使用だけでも巣のできない製
品を製造することができる。前記各加圧力は成形型の大
きさ,成形物品の形状,流動性素材の質等によって適宜
選択して設定する。
In the above configuration, prior to filling the fluid material from the material inlet 4 at, for example, normal pressure plus 0.5 kg / cm 2, a pressurized fluid such as compressed air or compressed gas is supplied from the pressurizing port 5 to, for example, When there are several pressurizing ports 5, depending on the content of the molded article, 0.1 kg / square cm to 0.1 kg / sq.
If the pressure is adjusted to 5 kg / square cm or the like, the flowable material having a higher pressure than the pressurized fluid advances slowly while searching for a place where the pressure in the molding cavity 2 is weak, and pressurizes the pressurized fluid. It is extruded to the mouth 5 and is filled in the entire cavity 2. Therefore, no nest is formed on the molded product. Since the packing 1C is arranged on the outer peripheral portion of the annular introduction path 3, even if the annular introduction path 3 is filled with a flowable material and leaks outward, the packing 1C is stopped and the packing 1C gets wet. The packing action is completed, so that the material and air do not leak out of the mold from the molding cavity 2, and the internal pressure is stabilized. Further, by filling the annular introduction passage 3 with the flowable material and then filling the molding cavity 2 with the flowable material, the flowable material enters at the same pressure from the periphery of the molding cavity 2 at the same time by the principle of Pascal. As a result, there is no possibility of partial early or late movement of the fluid material, and nests are unlikely to occur in the product. In this case, depending on the article and the shape to be molded, it is possible to produce a product without nests by using only the pressurized fluid in the mold without the annular introduction path 3. In addition, even without using the pressurized fluid, it is possible to manufacture a product that cannot form a nest by using only the annular introduction path 3. The respective pressures are appropriately selected and set according to the size of the molding die, the shape of the molded article, the quality of the fluid material, and the like.

【0015】図3は自動制御方式による成形方法を示す
略示的ブロック図である。前記と同じ部材には同じ符号
を付して説明を省略する。この方法においては、加圧口
5に圧力制御器9を配設した事に特徴がある。図におい
て符号9Aは圧力センサ付き自動制御弁、9Bは機械式
排気弁、9Cはエアーチァンバ10は自動制御器であ
る。加圧口5をいくつか設定するものにおいては、各加
圧口5にそれぞれ圧力制御器9を配設して自動制御器1
0と電気的に接続させる。自動制御器10は、どのよう
な方式のものでもよいが、例えばNC制御方式であり、
あらかじめ設定した数値制御によって、加圧口5に対す
る加圧流動体の注入圧力を制御し、同時に素材注入手段
8による素材注入圧力を自動制御する。方法として、例
えば、素材注入手段8から材入口4を経て流動性素材を
常圧プラス0.5kg/平方cmで成形空洞部2に注入
させるについて、環状導入路3に流動性素材が充ちるま
で成形空洞部2内の圧力を大気圧に保持し、流動性素材
が成形空洞部2内に入る段階において、成形空洞部の内
圧を常圧プラス0.1kg/平方cmに加圧させる。常
圧プラス0.5kg/平方cmの圧力を持つ流動性素材
は、流れやすい方へと進んでいくが、材入口4と加圧口
5の双方から成形空洞部2内に圧力がかかり、成形空洞
部2の内圧が高くなるので、設定圧以上になると、自動
制御弁9Aの圧力センサが圧力を検知し、自動制御器1
0が作動して自動制御弁9Aが開く。圧力低下に伴って
圧力センサの低下圧力検知に伴い、自動制御器10が自
動制御弁9Aの閉作動をする。成形空洞部2に流動性素
材が充填されるに従って、加圧口がいくつかあるものに
おいて、各圧力センサによる部位的圧力検知に伴い、成
形空洞部2の部位的内圧に応じて部位的に大気圧に近づ
けたり、加圧したり調節させる。この経時的な圧力制御
は、成形空洞部2の大きさと、その成形空洞部2内に流
動性素材が充填される速度から、あらかじめ計算した数
値から制御値として自動制御器10に設定されたり、作
業中の圧力センサによる検知数値を自動制御器10にフ
ィードバックすることによりコントロールする。従っ
て、素材注入手段8の圧力、並びに成形空洞部2内の圧
力は製品製造時における諸条件によって任意に設定され
る。
FIG. 3 is a schematic block diagram showing a molding method by an automatic control method. The same members as those described above are denoted by the same reference numerals, and description thereof will be omitted. This method is characterized in that a pressure controller 9 is provided at the pressurizing port 5. In the figure, reference numeral 9A is an automatic control valve with a pressure sensor, 9B is a mechanical exhaust valve, 9C is an air chamber 10 and an automatic controller. In the case of setting several pressurizing ports 5, a pressure controller 9 is provided for each pressurizing port 5, and an automatic controller 1 is provided.
0 is electrically connected. The automatic controller 10 may be of any type, for example, an NC control type,
The injection pressure of the pressurized fluid into the pressurizing port 5 is controlled by a preset numerical control, and at the same time, the material injection pressure by the material injection means 8 is automatically controlled. As a method, for example, the flowable material is injected from the material injection means 8 through the material inlet 4 into the molding cavity 2 at normal pressure plus 0.5 kg / square cm until the flowable material is filled in the annular introduction passage 3. The pressure in the molding cavity 2 is maintained at atmospheric pressure, and at the stage when the fluid material enters the molding cavity 2, the internal pressure of the molding cavity is increased to normal pressure plus 0.1 kg / square cm. Fluid material having a pressure of normal pressure plus 0.5 kg / square cm proceeds in a direction that is easy to flow, but pressure is applied to the molding cavity 2 from both the material inlet 4 and the pressurizing port 5, and Since the internal pressure of the cavity 2 increases, when the internal pressure exceeds the set pressure, the pressure sensor of the automatic control valve 9A detects the pressure, and the automatic controller 1
0 operates to open the automatic control valve 9A. The automatic controller 10 closes the automatic control valve 9A in response to the detection of the reduced pressure by the pressure sensor as the pressure decreases. As the molding cavity 2 is filled with the flowable material, in the case where there are several pressurizing ports, the pressure is locally increased according to the local internal pressure of the molding cavity 2 with the detection of the partial pressure by each pressure sensor. Adjust to near or pressure. The pressure control over time can be set in the automatic controller 10 as a control value from a numerical value calculated in advance based on the size of the molding cavity 2 and the speed at which the fluid material is filled in the molding cavity 2, It is controlled by feeding back the numerical value detected by the pressure sensor during the work to the automatic controller 10. Therefore, the pressure of the material injection means 8 and the pressure in the molding cavity 2 are arbitrarily set according to various conditions at the time of manufacturing the product.

【0016】図4は特にFRP製品製造用の簡易な成形方
法を示す成形型の断面図である。前記部材と同じ部材に
は同じ符号を付して説明を省略する。この形態例におい
ては、加圧手段7は、ゴム袋の伸びと弾力性を利用して
いる。すなわち、素材注入手段8から常圧プラス0.5
kg/平方cmの圧力で流動性素材を成形空洞部2に注
入させると、成形空洞部2内は当初は常圧であるので流
動性素材は環状導入路3へ充満し、外側に配設されてい
るパッキン1Cに達してパッキン効果を高める。しかる
後、流動性素材の粘度、圧力などから、あらかじめ成形
空洞部2と環状導入路3の間に設定されている型部材1
A.1B間の隙間からパスカルの原理に従って同圧で均
等に成形空洞部2に入っていく。成形空洞部2内に流動
性素材が入るに従って内部の空気は押されて加圧口5を
経て加圧手段7であるゴム袋に入って、ゴム袋は膨らん
でくる。一定の膨らみを持つとゴム袋は素材の弾力性に
よって反撥するため、成形空洞部2内の圧力が高まり、
その結果、圧力の高い流動性素材は圧力の弱いところ、
すなわちガラス繊維間の間隙へと入り込み、完全な充填
をさせることができる。図中符号7Aは弁である。この
加圧手段7は、前例のような積極的な加圧はしないが、
流動性素材の圧力に対して、ゴム素材の弾力で成形空洞
部2の内圧を除々に高めることができる。加圧口5は前
記のように成型空洞の形状に応じて、一っ以上設定し
て、それぞれに加圧手段7を配設し、成型空洞部内の部
位的圧力を制御させる。加圧手段としてのゴム袋は、成
形空洞部2の容積や加圧を要する圧力等によって、各加
圧口5それぞれにつき最適な大きさ、弾力等が適宜選択
される。もちろんゴム袋に代えて、自動制御排気弁付き
箱体などにすることができる。
FIG. 4 is a cross-sectional view of a molding die showing a simple molding method particularly for manufacturing an FRP product. The same members as those described above are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the pressurizing means 7 utilizes the stretch and elasticity of the rubber bag. That is, the normal pressure plus 0.5
When the flowable material is injected into the molding cavity 2 at a pressure of kg / square cm, the flowable material fills the annular introduction path 3 and is disposed outside since the interior of the molding cavity 2 is initially at normal pressure. And the packing effect is increased. Thereafter, the mold member 1 previously set between the molding cavity 2 and the annular introduction path 3 is determined from the viscosity and pressure of the fluid material.
A. From the gap between 1B, it uniformly enters the molding cavity 2 at the same pressure according to Pascal's principle. As the flowable material enters the molding cavity 2, the air inside is pushed and enters the rubber bag as the pressurizing means 7 through the pressurizing port 5, and the rubber bag expands. With a certain bulge, the rubber bag repels due to the elasticity of the material, so the pressure in the molding cavity 2 increases,
As a result, fluid materials with high pressure can be used where pressure is weak,
That is, it can penetrate into the gaps between the glass fibers and be completely filled. Reference numeral 7A in the figure is a valve. This pressurizing means 7 does not perform positive pressurization as in the previous example,
The internal pressure of the molding cavity 2 can be gradually increased by the elasticity of the rubber material with respect to the pressure of the fluid material. As described above, one or more pressurizing ports 5 are set in accordance with the shape of the molding cavity, and a pressurizing means 7 is provided for each of them to control the partial pressure in the molding cavity. The optimal size, elasticity and the like of each of the pressure ports 5 are appropriately selected for the rubber bag as the pressurizing means depending on the volume of the molding cavity 2, the pressure required for pressurization, and the like. Of course, instead of the rubber bag, a box with an automatically controlled exhaust valve can be used.

【0017】[0017]

【発明の効果】以上説明したように、この発明は次のよ
うなすぐれた効果を有している。
As described above, the present invention has the following excellent effects.

【0018】A. 材入口の他方に形成された加圧口に
加圧手段を配設し、成形空洞部の内圧を部位的にコント
ロールすることによって、流動性素材の流動速度が遅く
なり、かつ圧力が高まって、成形空洞部の全域に均等に
流動性素材が移動し、毛細管現象、表面張力の作用も相
まって、成形空洞部内の隅々まで流動性素材が行きわた
るので、成型品に巣が生じないという効果がある。
A. A pressurizing means is disposed in a pressurizing port formed on the other side of the material inlet, and by locally controlling the internal pressure of the molding cavity, the flow speed of the flowable material is reduced, and the pressure is increased, The flowable material moves evenly throughout the molding cavity, and due to the capillary action and the effect of surface tension, the flowable material spreads to all corners of the molding cavity. is there.

【0019】B.成形空洞部の基端部において周部に環
状導入路を形成して、環状導入路に流動性素材を充満さ
せて成形空洞部の基端周部から流動性素材を充填させる
とき、パスカルの原理によって同じ圧力で周囲から成形
空洞部内に流動性素材が均等圧力で流入するため、成形
空洞部内に気溜りが生じることがなく成型品に巣が生じ
ない効果がある。また、環状導入路から均等圧で流動性
素材が成形空洞部に流入するので、成形品の構造に合わ
せて加圧口の位置を一度設定すれば、流動性素材の性状
を管理するだけで、加圧口の位置を固定しておくことが
できる効果がある。
B. When the annular introduction path is formed in the periphery at the base end of the molding cavity, and the annular introduction path is filled with the flowable material and the flowable material is filled from the base end periphery of the molding cavity, the principle of Pascal As a result, since the fluid material flows into the molding cavity from the surroundings at the same pressure with an equal pressure, there is an effect that no air pockets are formed in the molding cavity and no nest is formed in the molded product. In addition, since the fluid material flows into the molding cavity with uniform pressure from the annular introduction path, once the position of the pressurizing port is set according to the structure of the molded product, only the properties of the fluid material are managed, There is an effect that the position of the pressure port can be fixed.

【0020】C.いくつかの加圧口から加圧流動体を注
入して部位的な圧力を制御し、環状導入路から成形空洞
部内に流動性素材を充填させるとき、複雑な成形空洞部
の形状であっても成型品に巣を生じさせることがない効
果がある。
C. When controlling the local pressure by injecting a pressurized fluid from several pressurizing ports and filling the flowable material into the forming cavity from the annular introduction passage, even if the shape of the complex forming cavity is complicated There is an effect that a nest is not generated in a molded product.

【0021】D.成形型においては従来使用中の型を利
用して環状導入路を容易に形成することができ、また容
易に任意の加圧口を形成して、加圧手段を配設し、自由
に内圧をコントロールすることができる効果がある。
D. In the molding die, the annular introduction path can be easily formed by using the mold currently used, and an arbitrary pressurizing port can be easily formed, a pressurizing means is disposed, and the internal pressure can be freely adjusted. There is an effect that can be controlled.

【0022】E.成形空洞部に連通する圧力制御器と、
素材注入手段とを自動制御するとき、成形空洞部内圧を
部位的に自由にコントロールすることができるため、流
動性素材を最良の条件で充填させることができ、その結
果不良品が生じにくいという効果がある。
E. A pressure controller communicating with the molding cavity,
When the material injection means is automatically controlled, the internal pressure of the molding cavity can be freely controlled locally, so that the fluid material can be filled under the best conditions, and as a result, defective products are less likely to occur. There is.

【図面の簡単な説明】[Brief description of the drawings]

【図1】成形型の縦断正面図である。FIG. 1 is a vertical sectional front view of a molding die.

【図2】成形型のII型の平面図である。FIG. 2 is a plan view of a molding die II.

【図3】成形方法を示す略示的ブロック図である。FIG. 3 is a schematic block diagram showing a molding method.

【図4】第2形態例の成形方法を示す成形型の断面図で
ある。
FIG. 4 is a sectional view of a molding die showing a molding method according to a second embodiment.

【符号の説明】[Explanation of symbols]

1 成形型 1A I型 1B II型 1C パッキン 2 成形空洞部 3 環状導入路 4 材入口 5 加圧口 6 ガイド 7 加圧手段 8 素材注入手段 9 圧力制御器 9A 自動制御弁 9B 機械式排気弁 9C エアーチァンバ 10 自動制御器 DESCRIPTION OF SYMBOLS 1 Mold 1A I type 1B II type 1C Packing 2 Molding cavity 3 Annular introduction path 4 Material inlet 5 Pressurizing port 6 Guide 7 Pressurizing means 8 Material injection means 9 Pressure controller 9A Automatic control valve 9B Mechanical exhaust valve 9C Aercamba 10 Automatic controller

Claims (8)

【特許請求の範囲】[Claims] 【請求項1】 複数の型部材を組立てて内部に形成され
た成形空洞部に材入口から流動性素材を充填して成形体
を形成する方法において、材入口とは別に形成された一
っ以上の加圧口にそれぞれ加圧手段を配設して、成形空
洞部内圧を部位的に任意に調整しながら材入口から流動
性素材を充填させて成形することを特徴とするプラスチ
ック成形方法。
1. A method for assembling a plurality of mold members and filling a molding cavity formed therein with a flowable material from a material inlet to form a molded body, wherein at least one formed separately from the material inlet. A plastic molding method characterized in that a pressurizing means is disposed at each of the pressurizing ports, and a fluid material is filled from a material inlet and molded while the pressure inside the molding cavity is arbitrarily adjusted locally.
【請求項2】 複数の型部材を組立てて内部に形成され
た成形空洞部に材入口から流動性素材を充填して成形体
を形成する方法において、材入口とは別に形成された一
っ以上の加圧口にそれぞれ加圧手段を配設して、流動性
素材にかけられている圧力よりも低い圧力の加圧流動体
を注入し、成形空洞部内圧を経時的に任意に調節しなが
ら材入口から流動性素材を充填させて成型することを特
徴とするプラスチック成型方法。
2. A method of assembling a plurality of mold members and filling a molding cavity formed therein with a flowable material from a material inlet to form a molded body, wherein at least one formed separately from the material inlet. The pressurizing means is arranged at each pressurizing port of the material, and a pressurized fluid having a pressure lower than the pressure applied to the fluid material is injected, and the pressure inside the forming cavity is arbitrarily adjusted with time to obtain the material. A plastic molding method characterized by filling a fluid material from an inlet and molding.
【請求項3】前記素材注入手段と、加圧口に連設した圧
力制御器とを自動制御器で任意に制御し、成形空洞部の
部位的内圧を経時的に自動制御しながら成形することを
特徴とする請求項2に記載されたプラスチック成形方
法。
3. A method of controlling the material injection means and a pressure controller connected to a pressurizing port by means of an automatic controller to automatically control the partial internal pressure of the forming cavity with time. The plastic molding method according to claim 2, wherein:
【請求項4】 複数の型部材を組立てて内部に形成され
た成形空洞部に材入口から流動性素材を充填して成形体
を形成する方法において、材入口に接する成形空洞部の
基端周部に形成された、成形空洞部と近接する環状導入
路に充満させてから成形空洞部の周部から成形空洞部内
に充填させて成形することを特徴とするプラスチック成
形方法。
4. A method of forming a molded body by assembling a plurality of mold members and filling a molding cavity formed therein with a flowable material from a material inlet to form a molded body. A plastic molding method characterized by filling an annular introduction passage formed in a portion adjacent to a molding cavity and filling the molding cavity from a peripheral portion of the molding cavity and molding.
【請求項5】 複数の型部材を組立てて内部に形成され
た成形空洞部に材入口から流動性素材を充填して成形体
を形成する方法において、材入口とは別に形成された一
っ以上の加圧口にそれぞれ加圧手段を配設し、成形空洞
部内圧を部位的に任意にコントロールしながら、材入口
から流動性素材を、材入口に近接する環状導入路に充満
させて成形空洞部の周部から成形空洞部内に充填させて
成形することを特徴とするプラスチック成形方法。
5. A method for assembling a plurality of mold members and filling a molding cavity formed therein with a flowable material from a material inlet to form a molded body, wherein at least one formed separately from the material inlet. A pressurizing means is arranged at each pressurizing port of the molding cavity, and while the internal pressure of the molding cavity is arbitrarily controlled locally, the fluid material is filled from the material inlet into the annular introduction path close to the material inlet to form the molding cavity. A plastic molding method characterized in that a molding cavity is filled from the periphery of a part and molded.
【請求項6】 複数の型部材を組立てて内部に成形空洞
部が形成される成形型において、材入口に接する成形空
洞部の基端周部に環状導入路を形成し、材入口から圧入
される流動性素材を環状導入路を介して成形空洞部内に
周囲から充填するように構成されたことを特徴とする成
形型。
6. A molding die in which a plurality of mold members are assembled to form a molding cavity therein, an annular introduction path is formed at a base end peripheral portion of the molding cavity in contact with the material inlet, and is press-fitted from the material inlet. Characterized in that the molding material is configured to fill the molding cavity from the periphery with a fluid material through an annular introduction path.
【請求項7】 前記成形型において、材入口とは別部位
に形成された一っ以上の加圧口にそれぞれ加圧手段を配
設し、材入口から流動性素材を注入したときに加圧手段
によって成形空洞部の部位的内圧が任意に調整出来るよ
うに構成されていることを特徴とする請求項6に記載さ
れた成形型。
7. In the molding die, a pressurizing means is provided at each of one or more pressurizing ports formed at a portion different from the material inlet, and pressurized when a fluid material is injected from the material inlet. 7. The molding die according to claim 6, wherein a local internal pressure of the molding cavity can be arbitrarily adjusted by means.
【請求項8】 複数の型部材を組立てて内部に成形空洞
部が形成される成形型において、前記成形型の材入口と
は別部位に形成された一っ以上の圧入口に加圧手段から
圧送される加圧流動体の圧力を制御する圧力制御器を連
設すると共に、自動制御器を素材注入手段と圧力制御器
に電気的接続をし、自動制御器によって圧力制御器と素
材注入手段とを制御して、成形空洞部の部位的内圧を自
動コントロールするように構成したことを特徴とする成
形型。
8. A molding die in which a plurality of mold members are assembled to form a molding cavity therein, and one or more pressure inlets formed at a portion different from a material inlet of the molding die are provided with a pressure means. A pressure controller for controlling the pressure of the pressurized fluid to be pumped is connected in series, and an automatic controller is electrically connected to the material injection means and the pressure controller, and the pressure controller and the material injection means are controlled by the automatic controller. Wherein the internal pressure of the molding cavity is automatically controlled by controlling the internal pressure of the molding cavity.
JP21708697A 1997-07-28 1997-07-28 Plastic molding method and mold Pending JPH1142647A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21708697A JPH1142647A (en) 1997-07-28 1997-07-28 Plastic molding method and mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21708697A JPH1142647A (en) 1997-07-28 1997-07-28 Plastic molding method and mold

Publications (1)

Publication Number Publication Date
JPH1142647A true JPH1142647A (en) 1999-02-16

Family

ID=16698621

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21708697A Pending JPH1142647A (en) 1997-07-28 1997-07-28 Plastic molding method and mold

Country Status (1)

Country Link
JP (1) JPH1142647A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003025347A (en) * 2001-07-16 2003-01-29 Toray Ind Inc Vacuum rtm molding method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003025347A (en) * 2001-07-16 2003-01-29 Toray Ind Inc Vacuum rtm molding method

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