JP3253924B2 - Flow injection compression molding method and apparatus therefor - Google Patents
Flow injection compression molding method and apparatus thereforInfo
- Publication number
- JP3253924B2 JP3253924B2 JP24839998A JP24839998A JP3253924B2 JP 3253924 B2 JP3253924 B2 JP 3253924B2 JP 24839998 A JP24839998 A JP 24839998A JP 24839998 A JP24839998 A JP 24839998A JP 3253924 B2 JP3253924 B2 JP 3253924B2
- Authority
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- Japan
- Prior art keywords
- mold
- injection
- molten resin
- screw
- flow
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、その射出成形機の
射出容量を越える大容量の成形品を成形する射出成形方
法およびその装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method and apparatus for molding a large-capacity molded product exceeding the injection capacity of an injection molding machine.
【０００２】[0002]
【従来の技術】通常の射出成形方法では、その射出成形
機の射出容量を越える大容量の成形品を成形することは
不可能である。2. Description of the Related Art It is impossible to form a molded article having a large capacity exceeding the injection capacity of an injection molding machine by a usual injection molding method.
【０００３】大容量の成形品を成形する方法としては、
図３に示すような流動射出成形機によるフローモールデ
ィング法が古くから採用されている。[0003] As a method of molding a large volume molded article,
A flow molding method using a fluid injection molding machine as shown in FIG. 3 has been employed for a long time.
【０００４】この方法の原理を図３を参照して簡単に説
明する。図３（ａ）に示すように、まず、金型２１を型
締した後、射出装置２２を前進して、そのノズルを金型
２１にタッチする。その際、射出装置２２内のスクリュ
２３は、射出シリンダ２４により前方に加圧して最先端
位置にあるようにする。The principle of this method will be briefly described with reference to FIG. As shown in FIG. 3A, first, after closing the mold 21, the injection device 22 is advanced, and the nozzle is touched to the mold 21. At this time, the screw 23 in the injection device 22 is pressed forward by the injection cylinder 24 so as to be at the most distal position.
【０００５】次に、図３（ｂ）に示すように、スクリュ
２３を最前進位置に保持した状態でモータ２５を回転し
て、射出装置２２内の溶融樹脂をノズルを介して金型キ
ャビティ内に流動注入する。キャビティ内に溶融樹脂が
充填されるとスクリュ２３の回転が止まる。冷却時間経
過後、図３（ｃ）に示すように、射出装置２２を後退さ
せ、型開を行い成形品２６を取り出す。これで１サイク
ルが終了する。Next, as shown in FIG. 3B, the motor 25 is rotated while the screw 23 is held at the most advanced position, and the molten resin in the injection device 22 is discharged through the nozzle into the mold cavity. Flow injection into When the cavity is filled with the molten resin, the screw 23 stops rotating. After the cooling time has elapsed, as shown in FIG. 3C, the injection device 22 is retracted, the mold is opened, and the molded product 26 is taken out. This completes one cycle.
【０００６】[0006]
【発明が解決しようとする課題】上記フローモールディ
ング法は、もともと厚肉の成形品を効率的に成形するこ
とを目的として開発されたものであり、キャビティへの
充填抵抗の低いことが前提となるため、通常、溶融樹脂
の押出圧が２００〜５００ｋｇｆ／ｃｍ2で、１０〜５
０ｍｍの厚肉の成形品が対象となる。このため、１０ｍ
ｍ以下の肉厚で充填抵抗の高い大容量の成形品に対して
は、通常の射出成形方法によるしか現状では方法がない
ため、射出容量を大きくするには、型締力の大きな成形
機に変更する必要があり、成形コストの増大をまねくと
いう問題点があった。The above-mentioned flow molding method was originally developed for the purpose of efficiently forming a thick molded product, and is premised on low filling resistance to the cavity. Therefore, usually, the extrusion pressure of the molten resin is 200 to 500 kgf / cm 2 and 10 to 5
The target is a molded product having a thickness of 0 mm. Therefore, 10m
At present, there is no other method for large-capacity molded products with a thickness of less than m and high filling resistance, but only by the usual injection molding method. To increase the injection capacity, use a molding machine with a large clamping force. There was a problem that it was necessary to change it, which led to an increase in molding cost.
【０００７】そこで、本発明は、その射出成形機の射出
容量を越える大容量の成形品を射出成形機のランクを上
げることなく成形することができる射出成形方法および
その装置を提供することを課題とする。Accordingly, an object of the present invention is to provide an injection molding method and apparatus capable of molding a large-capacity molded product exceeding the injection capacity of the injection molding machine without raising the rank of the injection molding machine. And
【０００８】[0008]
【課題を解決するための手段】通常の射出成形方法によ
る成形品の一般的な肉厚は、２〜８ｍｍであるので、溶
融樹脂をキャビティ内に充填させるには、樹脂の種類に
もよるが、一般的には１０００ｋｇｆ／ｃｍ2前後の圧
力が必要となる。一方フローモールディング法では、ス
クリュ回転による溶融樹脂の押出圧力（通常５００ｋｇ
ｆ／ｃｍ2以下）しか期待できないので、通常の肉厚の
成形品をフローモールディング法で充填させることは不
可能である。The general thickness of a molded product obtained by a normal injection molding method is 2 to 8 mm. Therefore, filling the molten resin into the cavity depends on the type of the resin. In general, a pressure of about 1000 kgf / cm 2 is required. On the other hand, in the flow molding method, the extrusion pressure of the molten resin by screw rotation (normally 500 kg
f / cm 2 or less), it is impossible to fill a molded product having a normal thickness by a flow molding method.
【０００９】そこで、本発明者は、その射出成形機の射
出容量を越える大容量の成形品を成形するために、フロ
ーモールディング法及び射出圧縮法並びに通常の射出成
形法を組み合わせることによって上記課題を解決した。The inventor of the present invention has solved the above-mentioned problems by combining a flow molding method, an injection compression method, and a usual injection molding method in order to mold a large-capacity molded product exceeding the injection capacity of the injection molding machine. Settled.
【００１０】すなわち、本発明による流動射出圧縮成形
方法およびその装置は、金型を予め規定寸法分だけ開い
た位置に保持し、インラインスクリュを所定量の溶融樹
脂が予め計量されている位置に保持し、前記スクリュを
所定時間回転させて金型キャビティ内に溶融樹脂を流動
注入した後、前記金型を圧縮し、前記予め計量されてい
る所定量の樹脂を金型キャビティ内に射出して、その射
出成形機の射出容量を越える大容量の成形品を成形する
ことを特徴としている。That is, in the flow injection compression molding method and apparatus according to the present invention, the mold is held at a position opened by a predetermined dimension in advance, and the in-line screw is held at a position where a predetermined amount of molten resin is measured in advance. Then, after rotating the screw for a predetermined time to flow and inject the molten resin into the mold cavity, the mold is compressed, and the predetermined amount of the resin measured in advance is injected into the mold cavity, It is characterized by molding a large-capacity molded product exceeding the injection capacity of the injection molding machine.
【００１１】[0011]
【発明の実施の形態】本発明の実施の形態を実施例に基
づき図面を参照して説明する。図１は、本発明による流
動射出圧縮成形機の動作図である。同図に示すように本
発明による成形機は、固定型１と移動型２からなる金型
３を開閉する型締装置４と射出装置５とからなり、型締
シリンダ６、インラインスクリュ７を前進させる射出シ
リンダ８および射出装置５を前後動させる射出装置シリ
ンダ９の油圧配管にはそれぞれ圧力計１０が取り付けら
れている。なお、スクリュ７はモータ１１によって回転
される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is an operation diagram of a fluid injection compression molding machine according to the present invention. As shown in the figure, the molding machine according to the present invention comprises a mold clamping device 4 for opening and closing a mold 3 composed of a fixed mold 1 and a movable mold 2 and an injection device 5, and moves a mold clamping cylinder 6 and an in-line screw 7 forward. Pressure gauges 10 are respectively attached to hydraulic pipes of the injection cylinder 8 to be moved and the injection device cylinder 9 for moving the injection device 5 back and forth. The screw 7 is rotated by a motor 11.
【００１２】前記射出装置５には、インラインスクリュ
７を所定量の溶融樹脂が予め計量されている位置に保持
する手段と、前記スクリュ７を所定時間回転させて金型
キャビティ内に溶融樹脂を流動注入する手段と、前記金
型３を圧縮した後、前記予め計量されている所定量の溶
融樹脂を前記金型キャビティ内に射出する手段とを有し
ている。The injection device 5 includes means for holding the in-line screw 7 at a position where a predetermined amount of molten resin is measured in advance, and rotating the screw 7 for a predetermined time to flow the molten resin into the mold cavity. It has a means for injecting and a means for injecting the pre-measured predetermined amount of the molten resin into the mold cavity after compressing the mold 3.
【００１３】以下、その動作を（ａ）〜（ｇ）の順に説
明する。 （ａ）まず、型締シリンダ６に低圧を作用して、移動型
２を固定型１側に移動して型閉する。移動型２は、流動
圧を低く押さえるため、予め規定寸法分だけ開いた位置
（通常１０〜３０ｍｍ）に保持する。その際、スクリュ
７は所定量の溶融樹脂が計量される位置まで予め後退さ
せておく。 （ｂ）射出装置シリンダ９に低圧を作用して、射出装置
５を前進し、固定型１にゆっくり当てた後、前記シリン
ダ９に高圧を作用して、射出装置５の先端に取り付けら
れているノズルを固定型１にタッチする。 （ｃ）スクリュ７を前記位置に保持しながら、モータ１
１により所定時間回転させて、溶融樹脂をフロー圧（通
常２００〜５００ｋｇｆ／ｃｍ2）で金型キャビティ内
に流動注入させる。スクリュ７を前記位置に保持するに
は、射出シリンダ８のヘッド側の油圧室の油の戻りライ
ンに抵抗をかけてスクリュ７を後退しにくくする必要が
あり、スクリュ背圧調整弁を絞る方法が有効である。 （ｄ）所定時間流動注入経過後、さらに型締圧力を高く
して移動型２を前記規定寸法分前進させることにより、
厚肉部を圧縮しながら未充填のキャビティ内に溶融樹脂
を充填させる。The operation will be described below in the order of (a) to (g). (A) First, a low pressure is applied to the mold clamping cylinder 6 to move the movable mold.
2 is moved to the fixed mold 1 side and the mold is closed. The movable mold 2 is held at a position (usually 10 to 30 mm) opened by a predetermined dimension in advance in order to keep the flow pressure low. At this time, the screw 7 is retracted in advance to a position where a predetermined amount of the molten resin is measured. (B) Injection device by applying low pressure to injection device cylinder 9
5 forward and slowly hit the fixed mold 1
A high pressure is applied to the nozzle 9, and the nozzle attached to the tip of the injection device 5 is touched to the fixed mold 1. (C) While holding the screw 7 at the position, the motor 1
The resin is rotated for a predetermined time according to 1 to flow and inject the molten resin into the mold cavity at a flow pressure (normally 200 to 500 kgf / cm 2 ). In order to hold the screw 7 in the above position, it is necessary to make it difficult for the screw 7 to retreat by applying resistance to the oil return line in the hydraulic chamber on the head side of the injection cylinder 8, and a method of squeezing the screw back pressure adjusting valve is known. It is valid. (D) After the flow injection for a predetermined time, the mold clamping pressure is further increased to move the movable mold 2 forward by the specified dimension,
The molten resin is filled into the unfilled cavity while compressing the thick part.
【００１４】この圧縮工程と並行して、スクリュ７を高
圧で前進して、予め計量されている所定量の溶融樹脂を
キャビティ内に押出圧力より高い射出圧力（通常１００
０〜２０００ｋｇｆ／ｃｍ2）で射出し、不足分の溶融
樹脂を充填させる。その後、冷却作用によって発生する
収縮分を補うために、保圧（通常５００〜１０００ｋｇ
ｆ／ｃｍ2）を所定時間作用させる。 （ｅ）スクリュ７に背圧を与えながらスクリュ７を回転
して、溶融樹脂が所定量計量される位置まで後退させ
る。 （ｆ）射出装置５を低圧で後退する。 （ｇ）冷却時間経過後に、高圧で型開きを行い、油圧エ
ジェクタ１２で成形品１３を突き出す。これにより、ヒ
ケの少ない大容量の完成品１３を得ることが可能とな
る。In parallel with the compression step, the screw 7 is advanced at a high pressure, and a predetermined amount of the molten resin which has been measured in advance is injected into the cavity at an injection pressure higher than the extrusion pressure (usually 100 injection pressure).
0 to 2000 kgf / cm 2 ), and the insufficient amount of molten resin is filled. After that, in order to compensate for the shrinkage generated by the cooling action, a holding pressure (normally 500 to 1000 kg) is used.
f / cm 2 ) is applied for a predetermined time. (E) The screw 7 is rotated while applying a back pressure to the screw 7, and is retracted to a position where a predetermined amount of the molten resin is measured. (F) Retreat the injection device 5 at low pressure. (G) After the cooling time has elapsed, the mold is opened at a high pressure, and the molded product 13 is pushed out by the hydraulic ejector 12. This makes it possible to obtain a large-capacity finished product 13 with little sink marks.
【００１５】上記動作において、スクリュ７を溶融樹脂
が所定量計量される位置まで予め後退させ、その位置を
保持しながら所定時間回転させて溶融樹脂を金型３のキ
ャビティ内に流動注入させる際、スクリュ７の位置が最
前進位置より離れれば離れる程、押出能力が減少する。
そこで、例えば、射出容量が２０ｋｇの射出成形機で、
３０ｋｇの大容量の成形品１３を成形するためには、１
０ｋｇの射出容量が不足するので、スクリュ７の位置を
押出能力に応じた位置として、流動注入で極力多量に、
例えば１５〜２０ｋｇ注入し、射出で残り１０〜１５ｋ
ｇを充填することが望ましい。In the above operation, when the screw 7 is retracted in advance to a position where the molten resin is measured by a predetermined amount, and the screw 7 is rotated for a predetermined time while maintaining the position to flow and inject the molten resin into the cavity of the mold 3, As the position of the screw 7 is further away from the most advanced position, the pushing ability is reduced.
Therefore, for example, with an injection molding machine having an injection capacity of 20 kg,
In order to mold a large-sized molded article 13 of 30 kg, 1
Since the injection capacity of 0 kg is insufficient, the position of the screw 7 is set to a position corresponding to the extrusion capacity, and as much as possible by flow injection,
For example, inject 15-20kg, and the remaining 10-15k by injection
g.
【００１６】図１に示す金型は通常金型を示している
が、製品形状によってはパーティング面が開いていると
バリの発生する可能性がある為、圧縮専用金型を採用す
ることが望ましい。図２は圧縮専用金型の作動説明図で
あり、（ａ）は規定ストローク分を型開きした状態で射
出装置内５のスクリュ７を回転して溶融樹脂を金型キャ
ビティ内に流動注入している状態を示し、（ｂ）は圧縮
専金型３を圧縮しながら、スクリュ７を前進して射出、
保圧している状態を示している。同図に示すように、金
型３は、固定型１である雌型と移動型２である雄型とか
らなる。成形品１３の形状によっては両型１，２間にバ
リが発生する可能性があるため、移動型２の固定型１側
にスプリング１４を介してシール板１５を摺動可能に設
け、このシール板１５を常時固定型１に押し付けること
が望ましい。この成形法のポイントは、流動注入時に如
何に大量の溶融樹脂を注入できるかにあるので、移動型
２の圧縮ストロークは、できるだけ大きくとって、流動
注入時の充填抵抗を低く押さえる為に、キャビティ容積
を大きくする必要がある。Although the mold shown in FIG. 1 is usually a mold, depending on the product shape, if the parting surface is open, burrs may be generated. desirable. 2A and 2B are explanatory diagrams of the operation of the compression-only mold. FIG. 2A shows a state in which the screw is rotated by rotating the screw 7 in the injection device 5 in a state where the mold is opened for a prescribed stroke, and the molten resin is flow-injected into the mold cavity. (B) shows the state in which the screw 7 is advanced while the compression mold 3 is being compressed, and the screw 7 is advanced.
This shows a state where the pressure is maintained. As shown in FIG. 1, the mold 3 includes a female mold as the fixed mold 1 and a male mold as the movable mold 2. Since there is a possibility that burrs may be generated between the two dies 1 and 2 depending on the shape of the molded product 13, a seal plate 15 is slidably provided on the fixed die 1 side of the movable die 2 via a spring 14. It is desirable to always press the plate 15 against the fixed mold 1. The point of this molding method is how much molten resin can be injected at the time of flow injection. Therefore, the compression stroke of the movable mold 2 is set as large as possible, and the cavity is formed so as to keep the filling resistance at the time of flow injection low. It is necessary to increase the volume.
【００１７】図２の圧縮専用金型は、固定型が雌型で移
動型が雄型であるが、固定型が雄型で移動型が雌型のも
のもあり、同様に使用できることは明らかである。The compression mold of FIG. 2 has a female fixed type and a male movable type. However, there is a fixed type of male type and a movable type of female type. is there.
【００１８】また、実施例の流動射出圧縮成形機を油圧
式で説明したが、電動式で同様に使用できることも明ら
かである。Although the hydraulic injection compression molding machine of the embodiment has been described as a hydraulic type, it is apparent that an electric type can be used similarly.
【００１９】[0019]
【発明の効果】本発明は、上述したように構成されてい
るので、その射出成形機の射出容量を越えた大容量の成
形品を成形することが可能となる。また、成形機のダウ
ンサイジングが可能となるため、加工コストができる。
また、既存の射出成形機を改良して、より大容量の射出
成形機とすることが容易に可能である。Since the present invention is constructed as described above, it is possible to mold a large-capacity molded product exceeding the injection capacity of the injection molding machine. Further, since downsizing of the molding machine is possible, processing costs are increased.
Further, it is possible to easily improve the existing injection molding machine to obtain a larger capacity injection molding machine.
【図１】本発明による流動射出圧縮成形機の動作図であ
る。FIG. 1 is an operation diagram of a fluid injection compression molding machine according to the present invention.
【図２】圧縮専用金型の作動説明図である。FIG. 2 is an operation explanatory view of a compression-only mold.
【図３】従来の流動射出成形機の動作図である。FIG. 3 is an operation diagram of a conventional flow injection molding machine.
１ 固定型 ２ 移動型 ３、２１ 金型 ４ 型締装置 ５、２２ 射出装置 ６ 型締シリンダ ７、２３ インラインスクリュ（スクリュ） ８、２４ 射出シリンダ ９ 射出装置シリンダ １０ 圧力計 １１、２５ モータ １２ 油圧エジェクタ １３、２６ 成形品 １４ スプリング １５ シール板 DESCRIPTION OF SYMBOLS 1 Fixed type 2 Moving type 3, 21 Die 4 Mold clamping device 5, 22 Injection device 6 Mold clamping cylinder 7, 23 In-line screw (screw) 8, 24 Injection cylinder 9 Injection device cylinder 10 Pressure gauge 11, 25 Motor 12 Hydraulic pressure Ejector 13, 26 Molded product 14 Spring 15 Seal plate
Claims (2)
位置に保持し、インラインスクリュ（７）を所定量の溶
融樹脂が予め計量されている位置に保持し、前記スクリ
ュ（７）を所定時間回転させて金型キャビティ内に溶融
樹脂を流動注入した後、前記金型（３）を圧縮しながら
前記予め計量されている所定量の溶融樹脂を金型キャビ
ティ内に射出すること特徴とする流動射出圧縮成形方
法。The in-line screw (7) is held at a position where a predetermined amount of molten resin is measured beforehand, and the mold (3) is held at a position opened by a predetermined dimension in advance. Is rotated for a predetermined time to flow and inject the molten resin into the mold cavity. Then, while compressing the mold (3), the predetermined amount of the previously measured molten resin is introduced into the mold cavity. A fluid injection compression molding method characterized by injection.
位置に保持する手段と、インラインスクリュ（７）を所
定量の溶融樹脂が予め計量されている位置に保持する手
段、前記スクリュ（７）を所定時間回転させて金型キャ
ビティ内に溶融樹脂を流動注入する手段と、前記金型
（３）を圧縮しながら前記予め計量されている所定量の
溶融樹脂を前記金型キャビティ内に射出する手段とを有
することを特徴とする流動射出圧縮成形装置。2. The mold (3) is opened by a predetermined dimension in advance.
Means for holding the in-line screw (7) at a position where a predetermined amount of molten resin is measured in advance, and rotating the screw (7) for a predetermined time to flow the molten resin into the mold cavity. means for injecting and means for injecting a predetermined amount of molten resin that said previously been weighed while compressing the mold (3) in the mold cavity Yes
Flow injection compression molding apparatus according to claim to Rukoto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24839998A JP3253924B2 (en) | 1998-09-02 | 1998-09-02 | Flow injection compression molding method and apparatus therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24839998A JP3253924B2 (en) | 1998-09-02 | 1998-09-02 | Flow injection compression molding method and apparatus therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000071294A JP2000071294A (en) | 2000-03-07 |
| JP3253924B2 true JP3253924B2 (en) | 2002-02-04 |
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|---|---|---|---|
| JP24839998A Expired - Fee Related JP3253924B2 (en) | 1998-09-02 | 1998-09-02 | Flow injection compression molding method and apparatus therefor |
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| JP (1) | JP3253924B2 (en) |
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| KR101366053B1 (en) * | 2010-11-26 | 2014-02-24 | 미르하이텍 주식회사 | Injection molding apparatus |
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| Publication number | Publication date |
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| JP2000071294A (en) | 2000-03-07 |
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