JP4537441B2 - Control method of injection molding machine - Google Patents

Control method of injection molding machine Download PDF

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JP4537441B2
JP4537441B2 JP2007317955A JP2007317955A JP4537441B2 JP 4537441 B2 JP4537441 B2 JP 4537441B2 JP 2007317955 A JP2007317955 A JP 2007317955A JP 2007317955 A JP2007317955 A JP 2007317955A JP 4537441 B2 JP4537441 B2 JP 4537441B2
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mold
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光昭 天野
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Sumitomo Heavy Industries Ltd
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本発明は射出成形機の制御方法に関する。   The present invention relates to a method for controlling an injection molding machine.

射出成形において成形品の精度を決める要素として、充填・保圧工程の射出圧のプロファイルによるものが大きいことが知られている。薄肉成形品の場合、特にV/P切換(射出工程から保圧工程への切換)前後の射出圧の違いにより、ショート、ヒケ、バリ、ソリ等の成形不良現象が発生してしまう。特に、バリ発生の原因である過充填は、金型破損の直接的な原因でもあり、もっとも嫌う成形不良現象である。   It is known that an injection pressure profile in a filling / holding process is a large factor that determines the accuracy of a molded product in injection molding. In the case of a thin-walled molded product, a molding failure phenomenon such as short, sink, burr, warp, etc. occurs due to the difference in injection pressure before and after V / P switching (switching from injection process to pressure holding process). In particular, overfilling, which is the cause of burrs, is also a direct cause of mold breakage and is a molding defect phenomenon that is most hated.

上述の不良現象を回避させるための成形条件としては、V/P切換位置設定、射出速度設定、保圧圧力設定等があるが、それぞれの設定が相互に複雑に影響し合うので、良好な成形条件を見出だすには熟練者でも非常に煩雑な作業を必要とする。   Molding conditions for avoiding the above-described defective phenomenon include V / P switching position setting, injection speed setting, holding pressure setting, etc., but each setting affects each other in a complicated manner, so that good molding is achieved. To find the conditions, even an expert needs very complicated work.

一方、金型内に設置した型内圧センサの検出値を用いてV/P切換を行ったとしても(いわゆる、型内圧V/P切換)、V/P切換後の保圧設定を決めるのは容易ではない。   On the other hand, even if the V / P switching is performed using the detection value of the mold internal pressure sensor installed in the mold (so-called mold internal pressure V / P switching), the holding pressure setting after the V / P switching is determined. It's not easy.

図3に従来の射出・保圧工程のスクリュ速度、ゲート圧力、スクリュ位置、射出圧の挙動を示す。通常、保圧工程の制御は圧力、時間の設定により行われている。   FIG. 3 shows the behavior of the screw speed, gate pressure, screw position, and injection pressure in the conventional injection / holding process. Normally, the pressure holding process is controlled by setting the pressure and time.

しかし、金型キャビティ内の樹脂の振る舞いは、ゲート等で圧縮された樹脂がキャビティ内で開放する時に起こる体積増加等があり、保圧工程における保圧圧力(スクリュヘッド部の圧力)を変更したとしてもスクリュヘッドからキャビティまでのノズル内流路、スプール及びランナ内の樹脂体積によりキャビティ内の樹脂には影響が少ない。   However, the behavior of the resin in the mold cavity is, for example, an increase in volume that occurs when the resin compressed by the gate or the like is released in the cavity. The pressure in the pressure-holding process (the pressure in the screw head) was changed. However, there is little influence on the resin in the cavity due to the flow volume in the nozzle from the screw head to the cavity, the volume of the resin in the spool and the runner.

一方、以下のような射出成形方法が提案されている。射出工程開始後、スクリュが前進して設定位置に到達した時、その設定位置にスクリュを設定時間だけ静止させる。あるいはまた、射出工程開始後、射出シリンダ内圧力が設定圧力に達した時、その到達時点での位置に、設定時間だけスクリュを静止させる(例えば、特許文献1参照)。   On the other hand, the following injection molding methods have been proposed. When the screw advances and reaches the set position after the injection process starts, the screw is stopped at the set position for the set time. Alternatively, after the injection process starts, when the pressure in the injection cylinder reaches the set pressure, the screw is stopped at the position at the time when the pressure is reached (see, for example, Patent Document 1).

特開平7−299850号公報(第2頁、図3)Japanese Patent Laid-Open No. 7-299850 (second page, FIG. 3)

しかしながら、上記のような方法では、成形サイクル毎にスクリュ位置や、射出シリンダ内圧力にはばらつきが生じ易いために、精度の良い成形品を安定して成形することが難しい。   However, in the method as described above, since the screw position and the pressure in the injection cylinder are likely to vary for each molding cycle, it is difficult to stably mold an accurate molded product.

そこで、本発明の課題は、成形品精度の向上を実現できる射出成形機の制御方法を提供することにある。   Accordingly, an object of the present invention is to provide a method for controlling an injection molding machine that can improve the accuracy of a molded product.

本発明による射出成形機の制御方法は、スクリュを前進させて樹脂の金型のキャビティ内への充填を開始し、前記キャビティ内で樹脂が満杯になる手前より、前記スクリュのスクリュ位置を維持し、前記キャビティ内を充満させた後、保圧工程に移行することを特徴とする。 According to the control method of the injection molding machine of the present invention, the screw is advanced to start filling the resin mold cavity into the cavity, and the screw position of the screw is maintained before the resin is filled in the cavity. , after filling the inside of said cavity, characterized that you transition to the pressure-holding process.

更に、本発明による制御方法においては、前記スクリュ位置の維持時間は、0.5(sec)以下であることを特徴とする。   Furthermore, in the control method according to the present invention, the screw position maintaining time is 0.5 (sec) or less.

本発明によれば、精度の良い成形品を安定して成形することができる。   According to the present invention, an accurate molded product can be stably molded.

本発明による制御方法は、溶融樹脂の特性(弾性体としての圧縮性)を利用した成形方法であるとも言え、これについては後述される。   It can be said that the control method according to the present invention is a molding method utilizing the characteristics of the molten resin (compressibility as an elastic body), which will be described later.

図1は、本発明が適用される油圧式射出成形機の概略構成を示す。油圧式の射出装置側においては、スクリュ駆動用シリンダ11で射出軸(図示省略)を介して加熱シリンダ20内のスクリュ12を駆動する。つまり、シリンダ駆動用サーボ弁13によりスクリュ駆動用シリンダ11への作動油の流入、流出を制御することによりスクリュ12を前進、後退、停止させることができる。シリンダ駆動用サーボ弁13はスクリュ駆動用シリンダ11と油圧源14、作動油タンク15との間の油圧経路を切り換えるものである。油圧配管には射出圧センサ16、17が設けられ、スクリュ12と一体に動く可動部にはスクリュ位置センサ18が設けられる。   FIG. 1 shows a schematic configuration of a hydraulic injection molding machine to which the present invention is applied. On the hydraulic injection device side, the screw 12 in the heating cylinder 20 is driven by the screw driving cylinder 11 via an injection shaft (not shown). That is, the screw 12 can be moved forward, backward, and stopped by controlling the inflow and outflow of the hydraulic oil to the screw driving cylinder 11 by the cylinder driving servo valve 13. The cylinder drive servo valve 13 switches a hydraulic path between the screw drive cylinder 11, the hydraulic source 14, and the hydraulic oil tank 15. Injection pressure sensors 16 and 17 are provided in the hydraulic piping, and a screw position sensor 18 is provided in a movable portion that moves integrally with the screw 12.

一方、型締装置側においては、固定プラテン21に固定金型22が取り付けられ、可動プラテン23には可動金型24が取り付けられている。本形態では、金型の型内圧を検出するために、金型のキャビティ面に型内圧センサ25が設けられている。型内圧センサは、ランナ部あるいはゲートに設けられても良く、いずれの場合も検出される圧力は型内圧と呼ぶこととする。   On the other hand, on the mold clamping device side, a fixed mold 22 is attached to the fixed platen 21, and a movable mold 24 is attached to the movable platen 23. In this embodiment, in order to detect the mold internal pressure of the mold, a mold internal pressure sensor 25 is provided on the cavity surface of the mold. The mold internal pressure sensor may be provided in the runner portion or the gate, and the pressure detected in either case is referred to as mold internal pressure.

本制御方法では、図示しない制御装置が射出圧センサ16、17、スクリュ位置センサ18、型内圧センサ25等の各種センサからの検出信号を受けて、シリンダ駆動用サーボ弁13を制御することで以下の制御方法を実行する。   In this control method, a control device (not shown) receives detection signals from various sensors such as the injection pressure sensors 16 and 17, the screw position sensor 18 and the mold pressure sensor 25, and controls the cylinder drive servo valve 13 to perform the following. The control method is executed.

次に、本制御方法による制御動作について説明する。以下では、1サイクル当たりの成形動作のうち、本発明にかかわる制御動作部分のみを重点的に説明する。   Next, the control operation by this control method will be described. In the following, only the control operation portion related to the present invention will be mainly described in the molding operation per cycle.

本形態による制御方法では、射出工程開始後、金型内に設置した型内圧センサ25により得られた圧力が、あらかじめ設定された圧力(以下、スクリュ位置制御開始型内圧と呼ぶ)に到達したら、その時点のスクリュ位置にスクリュを維持するスクリュ位置制御を行い、あらかじめ設定されたスクリュ位置制御時間の経過後、従来の保圧工程に移行する。つまり、本制御方法では、従来のV/P切換は無いと言える。   In the control method according to the present embodiment, after the injection process starts, when the pressure obtained by the mold internal pressure sensor 25 installed in the mold reaches a preset pressure (hereinafter referred to as screw position control start mold internal pressure) Screw position control is performed to maintain the screw at the current screw position, and after a preset screw position control time has elapsed, the process proceeds to a conventional pressure holding process. That is, in this control method, it can be said that there is no conventional V / P switching.

図2に、本発明を適用した場合の射出工程・スクリュ位置制御工程・保圧工程を含む成形動作におけるスクリュ速度、型内圧力、スクリュ位置、射出圧の挙動を示す。ここで、使用した樹脂は溶融状態では高い圧縮性の特性を示し、型内圧センサはランナ部に配置した場合を示している。従って、図2に示された型内圧力はランナ部の圧力を示している。   FIG. 2 shows the behavior of the screw speed, in-mold pressure, screw position, and injection pressure in the molding operation including the injection step, screw position control step, and pressure holding step when the present invention is applied. Here, the used resin shows a high compressibility characteristic in the molten state, and the mold pressure sensor is shown in the case where it is arranged in the runner portion. Therefore, the in-mold pressure shown in FIG. 2 indicates the pressure in the runner portion.

射出圧センサ16、17の検出信号に基づく充填工程開始後、ランナ部の圧力がキャビティ内で樹脂が満杯状態になるわずか手前で設定されている型内圧(スクリュ位置制御開始型内圧)に達すると、スクリュ位置センサ18、型内圧センサ25の検出信号を用いてスクリュ位置制御を行うことにより、その時点のスクリュ位置を維持しキャビティ内の過充填を防止することができ、キャビティ内におけるゲートから遠方の箇所で生じるバリの発生を防止することができる。言い換えれば、スクリュの位置を維持した状態ではキャビティ内でちょうど樹脂が充満して満杯状態となっている。   After the filling process based on the detection signals of the injection pressure sensors 16 and 17 is reached, when the pressure in the runner reaches a mold internal pressure (screw position control start mold internal pressure) set just before the resin fills the cavity. By controlling the screw position using the detection signals of the screw position sensor 18 and the mold internal pressure sensor 25, the screw position at that time can be maintained and overfilling in the cavity can be prevented, and the distance from the gate in the cavity can be increased. It is possible to prevent the occurrence of burrs occurring at the locations. In other words, in a state where the position of the screw is maintained, the resin is just filled in the cavity and is full.

その後、あらかじめ設定された時間が経過すると、スクリュ位置制御が解除、つまりスクリュの位置保持が解除され、再び射出圧センサ16、17の検出信号に基づく圧力制御による保圧工程に移行する。この保圧工程への移行により、スクリュは一旦後退する場合もあるが、圧力制御にて型内に所定の圧力を与える保圧工程の作用により射出圧が一定に維持される。   Thereafter, when a preset time elapses, the screw position control is released, that is, the screw position is released, and the process proceeds to the pressure holding process by the pressure control based on the detection signals of the injection pressure sensors 16 and 17 again. Although the screw may be temporarily retracted due to the shift to the pressure-holding step, the injection pressure is kept constant by the action of the pressure-holding step of applying a predetermined pressure in the mold by pressure control.

なお、スクリュ位置保持を開始するための型内圧や、位置保持を維持し保圧工程へ移行するまでの時間等は、成形条件出しにおいて良好な成形品が得られた時の値が採用される。また、スクリュ位置制御時間は、薄肉成形品の場合、通常0.5(sec)以下の値である。   For the in-mold pressure for starting the screw position holding and the time until the position holding is maintained and the pressure holding process is started, the values obtained when a good molded product is obtained in the molding conditions are adopted. . Further, the screw position control time is usually a value of 0.5 (sec) or less in the case of a thin molded product.

上記のように、スクリュ位置制御のために型内圧センサを採用すると、成形サイクル毎の型内圧のばらつきも小さいので、精度の良い成形品を安定して成形することが可能となる。   As described above, when the in-mold pressure sensor is used for screw position control, the variation in the in-mold pressure for each molding cycle is small, so that a highly accurate molded product can be stably molded.

本発明は、図1で説明したような油圧式射出成形機に限らず、電動式射出成形機へも適用可能であることは言うまでも無い。   Needless to say, the present invention is applicable not only to the hydraulic injection molding machine as described with reference to FIG. 1 but also to an electric injection molding machine.

本発明が適用される油圧式射出成形機の概略構成を示す。1 shows a schematic configuration of a hydraulic injection molding machine to which the present invention is applied. 本発明を適用した場合の射出工程・スクリュ位置制御工程・保圧工程を含む成形動作におけるスクリュ速度、型内圧力、スクリュ位置、射出圧の挙動を示す。The behavior of screw speed, in-mold pressure, screw position, and injection pressure in a molding operation including an injection process, a screw position control process, and a pressure holding process when the present invention is applied is shown. 従来の射出・保圧工程のスクリュ速度、ゲート圧力、スクリュ位置、射出圧の挙動を示す。The behavior of screw speed, gate pressure, screw position, and injection pressure in the conventional injection / holding process is shown.

符号の説明Explanation of symbols

11 スクリュ駆動用シリンダ
12 スクリュ
13 シリンダ駆動用サーボ弁
14 油圧源
15 作動油タンク
16、17 射出圧センサ
18 スクリュ位置センサ
20 加熱シリンダ
21 固定プラテン
22 固定金型
23 可動プラテン
24 可動金型
25 型内圧センサ
DESCRIPTION OF SYMBOLS 11 Screw drive cylinder 12 Screw 13 Cylinder drive servo valve 14 Hydraulic source 15 Hydraulic oil tank 16, 17 Injection pressure sensor 18 Screw position sensor 20 Heating cylinder 21 Fixed platen 22 Fixed mold 23 Movable platen 24 Movable mold 25 Internal pressure Sensor

Claims (2)

スクリュを前進させて樹脂の金型のキャビティ内への充填を開始し、
前記キャビティ内で樹脂が満杯になる手前より、前記スクリュのスクリュ位置を維持し、前記キャビティ内を充満させた後、保圧工程に移行することを特徴とする射出成形機の制御方法。
Advance the screw to start filling the resin mold cavity,
From just before the resin is filled in the cavity, maintaining the screw position of the screw, after filling the inside of the cavity, a control method of an injection molding machine, characterized that you transition to the pressure-holding process.
請求項1に記載の制御方法において、前記スクリュ位置の維持時間は、0.5(sec)以下であることを特徴とする射出成形機の制御方法。 The control method according to claim 1 , wherein the screw position maintaining time is 0.5 (sec) or less.
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Publication number Priority date Publication date Assignee Title
JP5092927B2 (en) * 2008-06-20 2012-12-05 ソニー株式会社 INJECTION MOLDING CONTROL METHOD AND INJECTION MOLDING CONTROL DEVICE
JP2010058299A (en) * 2008-09-01 2010-03-18 Sumitomo Heavy Ind Ltd Injection control device and injection control method
JP5702878B2 (en) 2013-06-05 2015-04-15 ファナック株式会社 Pressure control device for injection molding machine
JP5698814B2 (en) 2013-09-17 2015-04-08 ファナック株式会社 Control method of injection molding machine
CN111791445B (en) * 2019-04-05 2022-03-22 恩格尔奥地利有限公司 Method for determining a target value for a state variable of a mixture

Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS60154028A (en) * 1984-01-23 1985-08-13 Toshiba Mach Co Ltd Control on injection process of injecting molding machine
JPS62173914U (en) * 1986-04-24 1987-11-05
JPS63242621A (en) * 1987-03-31 1988-10-07 Mitsubishi Metal Corp Method for injection molding
JPH07299850A (en) * 1994-04-30 1995-11-14 Tsuoisu Kk Injection molding method
JPH10264223A (en) * 1997-03-27 1998-10-06 Toshiba Mach Co Ltd Method and apparatus for dwell control of injection molding machine
JPH10272663A (en) * 1996-10-08 1998-10-13 Ube Ind Ltd Optimizing method of molding condition of injection molding machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60154028A (en) * 1984-01-23 1985-08-13 Toshiba Mach Co Ltd Control on injection process of injecting molding machine
JPS62173914U (en) * 1986-04-24 1987-11-05
JPS63242621A (en) * 1987-03-31 1988-10-07 Mitsubishi Metal Corp Method for injection molding
JPH07299850A (en) * 1994-04-30 1995-11-14 Tsuoisu Kk Injection molding method
JPH10272663A (en) * 1996-10-08 1998-10-13 Ube Ind Ltd Optimizing method of molding condition of injection molding machine
JPH10264223A (en) * 1997-03-27 1998-10-06 Toshiba Mach Co Ltd Method and apparatus for dwell control of injection molding machine

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