JPH08323832A - Injection compression molding method and apparatus - Google Patents
Injection compression molding method and apparatusInfo
- Publication number
- JPH08323832A JPH08323832A JP13627295A JP13627295A JPH08323832A JP H08323832 A JPH08323832 A JP H08323832A JP 13627295 A JP13627295 A JP 13627295A JP 13627295 A JP13627295 A JP 13627295A JP H08323832 A JPH08323832 A JP H08323832A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- mold clamping
- pressure
- mold
- filling
- 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
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/563—Enlarging the mould cavity during injection
Landscapes
- 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、低圧型締の金型キャビ
ティ内に溶融樹脂を充填し、充填された樹脂圧によって
金型が若干型開し、その後型締機構で金型を高圧に圧縮
するようにした射出圧縮成形方法および射出圧縮成形装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to fill a mold cavity of a low pressure mold with a molten resin, the mold is slightly opened by the pressure of the filled resin, and then the mold is clamped to a high pressure. The present invention relates to an injection compression molding method and an injection compression molding apparatus which are adapted to be compressed.
【０００２】[0002]
【従来の技術】射出成形機における射出圧縮成形は、 （１）射出充填された樹脂圧によって金型が僅かに開く
ときの金型（可動金型）の移動後退限を機械的に制御す
る。 （２）金型の型開移動量を検出し、設定された型開量お
よび型開速度になるように型締装置の型締圧力や射出速
度を制御する。 （３）金型の圧縮工程においては、設定された型開量か
ら設定した移動速度で型締動作が進行するように型締圧
力を変化させるなどの操作により、精密成形や複雑な形
状を有する成形品や薄肉形状の成形品を成形するように
意図している。 このように、射出圧縮成形では、成形中の金型の型開移
動量を常時検出し、その検出信号に基づいて設定型開量
や設定型開速度になるように、型締機構と射出機構へ同
時に指令を発信するフィードバック制御を実施してい
る。2. Description of the Related Art In injection compression molding in an injection molding machine, (1) mechanically control the movement and retreat limit of a mold (movable mold) when the mold is slightly opened by the resin pressure injected and filled. (2) The mold opening movement amount of the mold is detected, and the mold clamping pressure and the injection speed of the mold clamping device are controlled so that the set mold opening amount and mold opening speed are achieved. (3) In the mold compression process, by performing an operation such as changing the mold clamping pressure from the set mold opening amount so that the mold clamping operation proceeds at the set moving speed, precision molding or a complicated shape is achieved. Intended for molding molded parts and thin-walled molded parts. Thus, in injection compression molding, the mold opening movement amount of the mold during molding is always detected, and the mold clamping mechanism and the injection mechanism are set so that the set mold opening amount and the set mold opening speed are reached based on the detection signal. Feedback control is performed by sending a command to.
【０００３】型締動作を制御して射出圧縮成形を行なう
場合、初期の型締力設定条件によっては射出充填中の型
開量が過大となり、そのため、金型キャビティ内の樹脂
流動状態が射出充填工程と圧縮工程の切替の際に不連続
となり、その結果フローマークなどの欠陥が発生する。
そのために、射出充填動作に型締動作をオーバラップさ
せた射出・型締連動制御が必要であり、この型締開始の
タイミング制御が高品質な成形品を安定して供給させる
上で重要な制御となる。When injection compression molding is performed by controlling the mold clamping operation, the mold opening amount during injection filling becomes excessive depending on the initial mold clamping force setting conditions, so that the resin flow state in the mold cavity is injection filled. Discontinuity occurs when switching between the process and the compression process, resulting in defects such as flow marks.
Therefore, it is necessary to perform injection / clamping interlocking control that overlaps the mold clamping operation with the injection filling operation, and this timing control of the mold clamping start is an important control for stably supplying high quality molded products. Becomes
【０００４】一方、このような射出・型締連動制御とし
ては、従来、下記に示すような種々のパターンが試みら
れていた。 （１）射出充填中の可動盤または金型の後退量をモニタ
して後退量≧設定値となったとき、または、射出充填中
の型締駆動力の変化量をモニタして変化量≧設定値とな
ったときに、型締動作を開始する。…型締側信号基準 （２）射出充填中の金型キャビティ内の溶融樹脂の充填
状態（例えば、圧力、温度）をモニタしてモニタ値≧設
定値となったときに、型締動作を開始する。…金型側信
号基準 （３）射出充填中の射出シリンダまたは射出スクリュの
ストロークをモニタしてストローク位置≧設定値となっ
たときに、型締動作を開始する。…射出側信号基準 （４）初期型締動作完了、あるいは、射出充填開始など
成形工程中の任意の工程を基準として、起動するタイマ
のタイムアウト信号に基づいて型締動作を開始する。…
タイマ信号基準On the other hand, as such injection / mold clamping interlocking control, various patterns as shown below have been tried. (1) When the amount of retreat of the movable plate or the mold during injection filling is monitored and the amount of retreat becomes equal to or more than the set value, or the amount of change of the mold clamping drive force during injection filling is monitored and the amount of change ≥ setting When the value is reached, the mold clamping operation is started. ... Mold clamping side signal reference (2) The mold clamping operation is started when the filling state (for example, pressure and temperature) of the molten resin in the mold cavity during injection filling is monitored and the monitor value ≥ the set value To do. ... Mold side signal reference (3) When the stroke of the injection cylinder or the injection screw during injection filling is monitored and the stroke position ≥ the set value, the mold clamping operation is started. Injection-side signal reference (4) The mold-clamping operation is started based on the time-out signal of the timer to be activated with reference to an arbitrary step in the molding step such as completion of the initial mold-clamping operation or start of injection filling. …
Timer signal reference
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述の
（１）〜（４）の方法では、各々次に述べるような問題
点があった。すなわち、 （１）射出充填中の可動盤または金型の後退挙動は、射
出充填によって金型キャビティ内の充填された樹脂圧の
増加によって発生する型開反力と、設定型開量を保持し
ようとする型締側の制御された型締力とのバランスによ
って生じるものである。したがって、型締力の制御状態
（制御精度、応答性）によっては、後退挙動は大きく変
わってしまう。さらに、可動盤および金型（実際は一体
に取付けられている）は、相当な重量を有しており、射
出充填に伴う型開反力を正確に表現することは困難であ
り、応答性も低い。このことは、型締駆動力の変化にも
顕著に影響を与え、その結果、多くは検出遅れを生じて
最適な型締開始のタイミングがズレた制御となってしま
う。そこで、上記問題点を解決するため、タイミング制
御の基準となる設定値を検出遅れなどを見越して低目に
設定することも考えられるが、考慮の度合の判定基準が
ないため難しく、逆に、オーバダウンによる早期型締動
作開始によって、射出充填と型締動作の両方からの圧縮
作用により、射出圧縮成形の効果のひとつでもある金型
キャビティ内の樹脂圧の低減効果による低歪化を達成し
得なくなることが予想される。However, each of the above methods (1) to (4) has the following problems. That is, (1) the retracting behavior of the movable plate or the mold during the injection filling should be the mold opening reaction force generated by the increase of the resin pressure filled in the mold cavity by the injection filling and the set mold opening amount. It is caused by the balance with the controlled mold clamping force on the mold clamping side. Therefore, the retreat behavior greatly changes depending on the control state (control accuracy, responsiveness) of the mold clamping force. Further, the movable plate and the mold (actually, they are integrally attached) have a considerable weight, and it is difficult to accurately represent the mold opening force associated with injection filling, and the response is low. . This remarkably affects the change of the mold clamping driving force, and as a result, in many cases, the detection delay occurs and the optimum mold clamping start timing is deviated. Therefore, in order to solve the above problems, it may be possible to set the set value that is the reference of the timing control to a low value in anticipation of the detection delay, but it is difficult because there is no criterion for the degree of consideration, and conversely, By starting the mold clamping operation early due to overdown, the compression action from both injection filling and mold clamping operation achieves low distortion due to the effect of reducing the resin pressure in the mold cavity, which is one of the effects of injection compression molding. Expected to lose.
【０００６】（２）上記（１）の方法よりは検出精度は
高い方法と言えるが、圧力、温度などの検出センサによ
る検出信号はいずれもピンポイント計測であり、センサ
取付箇所によっては（実際はエジェクタピンなどの存在
により、取付場所は限定されている）全く異なった判断
をする可能性が極めて高い。上記問題点に対しては、セ
ンサ数を増して対応することも考えられるが、ピンポイ
ントデータの単なる集合体検出信号であるため、金型キ
ャビティ内の樹脂挙動を全体的には観察できないこと、
信号処理のためのソフト・ハードがともに複雑化するこ
とにより、大きなメリットを見い出すことはできない。
また、金型にセンサ類を取付けるための金型への特殊な
加工が必要なこと、金型毎に取付工数が必要なことなど
の理由からもデメリットは大きい。(2) Although it can be said that the detection accuracy is higher than that of the method (1), all the detection signals from the detection sensors such as pressure and temperature are pinpoint measurement, and depending on the sensor mounting location (actually, the ejector may be used). The location of installation is limited due to the presence of pins, etc.) It is extremely likely that a completely different judgment will be made. It is possible to deal with the above problems by increasing the number of sensors, but since it is a mere aggregate detection signal of pinpoint data, it is not possible to observe the resin behavior in the mold cavity as a whole,
Since software and hardware for signal processing are complicated, it is not possible to find a big advantage.
In addition, the demerits are large because the molds need to be specially processed to mount the sensors on the molds, and the man-hours for mounting the molds are required.
【０００７】（３）射出充填量を制御している箇所で、
直接、充填挙動を検出しているので、射出充填動作に型
締動作をオーバラップさせた射出・型締連動制御には、
従来方法の（１）〜（４）の中で、最も精度の高い制御
方法と言える。しかしながら、単に射出ストローク位置
のみでタイミング制御を行なう従来方法では、まだ計量
値の変動、チェックリングの作動状態の変動に起因する
充填量のバラツキを含んだ状態での検出方法であるた
め、射出充填挙動を正確に検知できているとは言えな
い。さらに、従来方法では、金型内の樹脂の充填挙動を
同時に把握するまでには至っておらず、そのため、成形
中の樹脂温度（射出シリンダ〜金型までの総合温度）の
変動に対しては対応困難であり、高品質な成形品を安定
して供給することはできない。 （４）従来方法（１）〜（４）の中で、最も簡単な制御
方法であるが、制御レベルは最も低く、そのため、単独
での使用では高精度射出圧縮成形の射出・型締連動制御
には、適応不十分である。(3) At the place where the injection filling amount is controlled,
Since the filling behavior is directly detected, the injection / mold clamping interlocking control that overlaps the mold clamping operation with the injection filling operation
It can be said that it is the most accurate control method among the conventional methods (1) to (4). However, in the conventional method in which the timing control is performed only by the injection stroke position, the injection method is a detection method in which the variation in the measured value and the variation in the operating state of the check ring still include the variation in the filling amount. It cannot be said that the behavior can be detected accurately. Furthermore, in the conventional method, it has not been possible to grasp the filling behavior of the resin in the mold at the same time, and therefore it is possible to cope with changes in the resin temperature during molding (total temperature from the injection cylinder to the mold). It is difficult and stable supply of high quality molded products is not possible. (4) This is the simplest control method among the conventional methods (1) to (4), but the control level is the lowest. Therefore, when used alone, it is injection-molding interlocking control for high-precision injection compression molding. Is poorly adapted to.
【０００８】[0008]
【課題を解決するための手段】以上の課題を解決するた
め、本発明においては、第１の発明では、樹脂の射出圧
縮成形方法において、あらかじめ樹脂の冷却固化収縮量
を算出し、該収縮量を加算した樹脂量を金型キャビティ
内に充填可能な射出圧力制御で射出充填するとともに、
充填された樹脂圧によって金型が開くことを許容する低
い型締力をあらかじめ金型に負荷させておき、射出充填
工程中の射出機構の射出速度が設定値まで減速されたこ
とを検知したのち型締圧力を増圧させるとともに、型締
機構の型締圧力と射出機構の射出圧力を同期制御するこ
ととした。また、第２の発明では、第１の発明における
射出充填工程中の射出速度の検知は、射出シリンダスト
ロークの前進限と該前進限に至るまでの射出充填完了近
傍の領域の射出シリンダストローク位置で行なうことと
した。さらに、第３の発明では、型締を制御する型締制
御部と射出充填を制御する射出制御部とを備え、射出充
填工程中の射出速度を検出する射出速度検出部と、射出
速度の検出範囲を設定する位置設定部と、前記射出速度
検出部からの検出信号に基づいて前記型締制御部へ型締
増圧信号を発信させる比較制御部と、型締圧力増圧後の
型締圧力と射出圧力を同期制御させる同期制御部とを備
えてなる射出圧縮成形装置とした。In order to solve the above-mentioned problems, in the present invention, in the first invention, in the resin injection compression molding method, the cooling solidification shrinkage amount of the resin is calculated in advance, and the shrinkage amount is calculated. Inject and fill the amount of resin added by the injection pressure control that can fill the mold cavity,
After the mold is preloaded with a low mold clamping force that allows the mold to open due to the filled resin pressure, it is detected that the injection speed of the injection mechanism during the injection filling process has been reduced to the set value. The mold clamping pressure is increased, and the mold clamping pressure of the mold clamping mechanism and the injection pressure of the injection mechanism are controlled synchronously. Further, in the second invention, the detection of the injection speed during the injection filling process in the first invention is performed by the advance limit of the injection cylinder stroke and the injection cylinder stroke position in the region near the completion of the injection filling until reaching the advance limit. I decided to do it. Further, according to the third aspect of the present invention, a mold clamping control unit that controls mold clamping and an injection control unit that controls injection filling are provided, and an injection speed detection unit that detects an injection speed during an injection filling process, and an injection speed detection. A position setting section for setting a range, a comparison control section for transmitting a mold clamping pressure increasing signal to the mold clamping control section based on a detection signal from the injection speed detecting section, and a mold clamping pressure after increasing the mold clamping pressure. The injection compression molding apparatus is provided with a synchronous control unit for synchronously controlling the injection pressure.
【０００９】[0009]
【作用】樹脂の冷却固化収縮量を加算した樹脂量を充填
可能な射出圧力制御で充填することにより、充填初期に
は流動抵抗が小さいため高速充填となり、充填後期には
流動抵抗の増加に伴って充填速度は自然減速され、パッ
ク圧の生じない理想的な自然充填流れ（ナチュラルフロ
ー）が自動的に得られる。さらに、射出充填工程中の射
出機構の射出速度が設定値まで減速されたことを検知し
た後、型締圧力で増圧させて圧縮工程を行なうことによ
り、射出・型締連動制御における型締増圧開始のタイミ
ング信号の検出を射出充填工程を制御している箇所で直
接検知し、さらにタイミング信号を射出速度の変化量を
用いていることにより、金型キャビティ内の溶融樹脂の
充填挙動も併せて検知していることで、射出機構側から
金型キャビティ内までの樹脂の充填挙動を総合的に把握
でき、極めて精度の高い射出・型締連動制御が実現でき
る。[Function] By filling the resin amount by adding the cooling and solidification shrinkage amount of the resin by the injection pressure control capable of filling, the flow resistance is small at the initial stage of the filling, so that the filling is performed at a high speed, and the flow resistance increases at the latter stage of the filling. As a result, the filling speed is naturally reduced, and an ideal natural filling flow (natural flow) without the pack pressure is automatically obtained. Furthermore, after detecting that the injection speed of the injection mechanism has been reduced to the set value during the injection filling process, the compression process is performed by increasing the mold clamping pressure to increase the mold clamping in the injection / mold clamping interlocking control. The detection of the pressure start timing signal is directly detected at the location where the injection and filling process is controlled, and the timing signal uses the amount of change in the injection speed, so that the filling behavior of the molten resin in the mold cavity is also included. By detecting with this, it is possible to comprehensively understand the filling behavior of the resin from the injection mechanism side to the inside of the mold cavity, and it is possible to realize extremely accurate injection / mold clamping interlocking control.
【００１０】その結果、計量値チェックリングの作動変
動などに起因する充填量のバラツキや成形中の樹脂温度
の変動などの外乱因子に影響されることなく、高精度射
出圧縮成形が制御できるため、高品質な成形品を安定し
て供給することができる。また、型締増圧以降は型締力
と射出圧力の同期制御を行なうことにより、型締動作に
よる圧縮工程で、従来、特に問題とされていた金型キャ
ビティから射出側への樹脂の逆流が防止できるため、成
形品重量が安定するとともに、樹脂の逆流により生じて
いた成形品の変形も防止できて、高品質な成形品を安定
して供給することができる。また、従来、逆流防止のた
め付設していたシャットオフバルブなどは不要となるた
め、低コスト化が達成できる。さらに、タイミング信号
の検出を射出シリンダストローク前進限を近くの射出充
填完了近傍の範囲内で行なうことにより、射出機構側で
の充填挙動と金型キャビティ内の充満挙動の相互関係を
最も的確に検知できる領域で型締開始のタイミング制御
が行なえるため、射出充填動作に型締動作をオーバラッ
プさせた射出・型締連動制御が正確に実現できる。As a result, high-precision injection compression molding can be controlled without being affected by disturbance factors such as variations in the filling amount due to fluctuations in the operation of the measured value check ring and fluctuations in the resin temperature during molding. It is possible to stably supply high quality molded products. In addition, by performing synchronous control of the mold clamping force and the injection pressure after the mold clamping pressure increase, resin backflow from the mold cavity to the injection side, which has been particularly problematic in the past, has been a problem in the compression process by the mold clamping operation. Since this can be prevented, the weight of the molded product becomes stable, and the deformation of the molded product caused by the backflow of the resin can be prevented, so that a high quality molded product can be stably supplied. Further, since a shut-off valve or the like which is conventionally provided for preventing backflow is not required, cost reduction can be achieved. Furthermore, the timing signal is detected within the range near the injection cylinder stroke advance limit near the injection filling completion, so that the mutual relationship between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity is detected most accurately. Since the timing control of the mold clamping start can be performed in the possible region, the injection / mold clamping interlocking control, which overlaps the injection filling operation with the mold clamping operation, can be accurately realized.
【００１１】[0011]
【実施例】以下図面に基づいて本発明の実施例について
詳細に説明する。図１〜図３は本発明の実施例に係り、
図１は射出圧縮成形装置の全体構成図、図２は射出充填
動作説明図、図３は射出圧縮成形方法のフローチャート
である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 relate to an embodiment of the present invention,
1 is an overall configuration diagram of an injection compression molding apparatus, FIG. 2 is an explanatory diagram of an injection filling operation, and FIG. 3 is a flowchart of an injection compression molding method.
【００１２】射出圧縮成形装置１００は、図１に示すよ
うに、型締装置１、射出装置４０および制御部６０から
構成されている。型締装置１は、移動シリンダ２、型締
シリンダ３、タイバー７、固定盤１０、ねじ噛合調整装
置１１、可動盤２０、半割ナット２２、タイバー係止装
置２６、固定金型３０ａ、可動金型３０ｂおよび連結板
５０などから構成され、固定金型３０ａの中央の凹部に
可動金型３０ｂの中央の凸部が嵌装され、摺動自在に進
退動できるようになっている。符号５ａはピストンロッ
ド室、８はねじ部（または溝部）、２８は金型キャビテ
ィである。As shown in FIG. 1, the injection compression molding apparatus 100 is composed of a mold clamping device 1, an injection device 40 and a control unit 60. The mold clamping device 1 includes a moving cylinder 2, a mold clamping cylinder 3, a tie bar 7, a fixed plate 10, a screw engagement adjusting device 11, a movable plate 20, a half nut 22, a tie bar locking device 26, a fixed mold 30a, and a movable mold. It is composed of a mold 30b and a connecting plate 50, and the central convex portion of the movable metallic mold 30b is fitted into the central concave portion of the fixed metallic mold 30a so that it can be slidably moved back and forth. Reference numeral 5a is a piston rod chamber, 8 is a screw portion (or groove portion), and 28 is a mold cavity.
【００１３】つぎに、射出装置４０について述べる。本
実施例における射出装置４０はバレル４１内にスクリュ
４２が配設され、ホッパ４３内の樹脂原料が供給ゾー
ン、圧縮ゾーンにおいて加熱圧縮され、計量ゾーンにお
いて溶融計量され、そして射出ゾーンを経てノズル４４
内へ射出されるように構成されている。そして、バレル
４１の外周面には樹脂原料を外部加熱するためのヒータ
が設けられており、樹脂原料がスクリュ４２の回転によ
って前方へ送られるようになっている。符号４６は射出
シリンダ、４７は正逆転用モータであってスクリュ４２
に直結されており、スクリュ４２を正逆回転するように
なっている。Next, the injection device 40 will be described. In the injection device 40 of this embodiment, a screw 42 is arranged in a barrel 41, a resin raw material in a hopper 43 is heated and compressed in a supply zone and a compression zone, melt-measured in a measuring zone, and a nozzle 44 is passed through the injection zone.
It is configured to be injected into. A heater for externally heating the resin raw material is provided on the outer peripheral surface of the barrel 41, and the resin raw material is fed forward by the rotation of the screw 42. Reference numeral 46 is an injection cylinder, 47 is a forward / reverse rotation motor, and the screw 42
Is directly connected to the screw 42 and rotates the screw 42 forward and backward.
【００１４】次に、制御部６０について述べる。制御部
６０は、射出制御部６１、同期制御部６２、比較制御部
６３、タイマ６３ａ、射出速度検出部６４、位置設定部
６５、ならびに型締制御部６６、油圧制御弁６７、油圧
制御弁６８、油圧供給源６８ａ、６８ｂなどで構成され
ている。そして、射出制御部６１は油圧制御弁６８を介
して正逆転用モータ４７の動作を制御する図示しない制
御装置に接続されるとともに、同期制御部６２とも接続
される。また、同期制御部６２は射出シリンダ４６の射
出速度検出部６４と比較制御部６３を介して接続され、
比較制御部６３にはタイマ６３ａが接続されるととも
に、射出速度検出部６４は位置設定部６５と接続され
る。一方、型締制御部６６は型締シリンダ３の動作を制
御する油圧制御弁６７に接続されている。なお、６８
ａ、６８ｂは簡略化した油圧供給源である。Next, the control unit 60 will be described. The control unit 60 includes an injection control unit 61, a synchronization control unit 62, a comparison control unit 63, a timer 63a, an injection speed detection unit 64, a position setting unit 65, a mold clamping control unit 66, a hydraulic control valve 67, and a hydraulic control valve 68. , Hydraulic pressure supply sources 68a, 68b and the like. The injection control unit 61 is connected via a hydraulic pressure control valve 68 to a control device (not shown) that controls the operation of the forward / reverse rotation motor 47, and is also connected to the synchronization control unit 62. The synchronization control unit 62 is connected to the injection speed detection unit 64 of the injection cylinder 46 via the comparison control unit 63,
The comparison control unit 63 is connected to the timer 63a, and the injection speed detection unit 64 is connected to the position setting unit 65. On the other hand, the mold clamping control unit 66 is connected to a hydraulic control valve 67 that controls the operation of the mold clamping cylinder 3. 68
Reference numerals a and 68b denote simplified hydraulic pressure supply sources.
【００１５】以上のように構成された射出圧縮成形装置
１００の作動について述べる。まず、生産成形運転に入
る前に通常行なわれる型締動作や取出動作の確認を済ま
せた後、試験成形運転を行なう。この試験成形運転では
通常数回の「捨て打ち」と呼ばれる試し打ちを行ない、
樹脂の特性に応じた射出充填量、射出圧力および型締圧
力の適正値を把握して条件設定の情報を得る。The operation of the injection compression molding apparatus 100 configured as above will be described. First, after confirming the mold clamping operation and the take-out operation that are normally performed before starting the production molding operation, the test molding operation is performed. In this test molding operation, we usually do several trial runs called "discarding",
The proper value of the injection filling amount, injection pressure and mold clamping pressure according to the characteristics of the resin is grasped to obtain the information of condition setting.
【００１６】特に、射出動作に型締動作をオーバラップ
させた射出・型締連動制御での射出圧縮成形において
は、型締開始のタイミングの条件設定が重要である。具
体的には、図２に示すように、以下の手順にしたがって
適正な型締開始のタイミング信号の条件の設定を行な
う。 あらかじめ設定した射出充填量（樹脂の冷却固化収
縮量を加算した樹脂量）と射出圧力（充填可能な圧力
値）の設定値に基づいて、射出充填を行なう。こうする
ことにより、充填初期は高速充填で、充填の進行に伴い
自然に減速される充填状態（ナチュラルフロー）が得ら
れる。 型締増圧開始のタイミング信号を検出する範囲を、
射出シリンダストロークの前進限（Ｅ点）と前進限（Ｅ
点）に至るまでの射出充填完了近傍の領域の射出シリン
ダストローク位置を位置設定値（モニタリング開始点
Ｖ）として、位置設定部６５を介して設定する。こうす
ることにより、射出機構側での充填挙動と金型キャビテ
ィ内の充満挙動の相互関係を最も的確に検知することに
なり、射出充填動作に型締動作をオーバラップさせた射
出・型締連動制御が正確に制御できる。 同時に、型締増圧開始のタイミング信号を射出速度
による比較設定値（Ｋ値）として比較制御部６３を介し
て設定する。射出圧力制御で射出充填を行なうことによ
りタイミング信号を射出速度で設定することにより、射
出機構側から金型キャビティ内の樹脂の充填挙動が総合
的に把握できるため、計量値、チェックリングの作動変
動による充填量のバラツキおよび成形中の樹脂温度の変
動などの外乱因子に影響されることなく、安定して高精
度なタイミング信号の検出ができる。In particular, in injection compression molding under injection / mold clamping interlocking control in which the mold clamping operation is overlapped with the injection operation, it is important to set the condition for the timing of starting the mold clamping. Specifically, as shown in FIG. 2, the conditions of the timing signal for starting the mold clamping are appropriately set according to the following procedure. Injection filling is performed based on preset values of injection filling amount (resin amount obtained by adding resin cooling and solidification shrinkage amount) and injection pressure (fillable pressure value). By doing so, a high-speed filling at the initial stage of filling and a filling state (natural flow) that is naturally decelerated as the filling progresses can be obtained. The range for detecting the timing signal of the start of mold clamping pressure increase is
Forward limit (point E) and forward limit (E) of the injection cylinder stroke
The injection cylinder stroke position in the area near the completion of injection filling up to the point) is set as a position set value (monitoring start point V) via the position setting unit 65. By doing so, the mutual relationship between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity can be detected most accurately, and injection / mold clamping interlocking that overlaps the mold clamping operation with the injection filling operation. Control can be controlled accurately. At the same time, the timing signal for starting the mold clamping pressure increase is set via the comparison control unit 63 as a comparison set value (K value) depending on the injection speed. By setting the timing signal at the injection speed by performing injection filling with injection pressure control, it is possible to comprehensively grasp the filling behavior of the resin in the mold cavity from the injection mechanism side, so the measured value and check ring operation fluctuations It is possible to stably and accurately detect a timing signal without being affected by disturbance factors such as the variation in the filling amount due to and the fluctuation of the resin temperature during molding.
【００１７】 上記設定値（Ｖ点、Ｋ点）に基づい
て、型締増圧開始のタイミング制御を行なう。射出シリ
ンダストロークがモニタリング開始点Ｖに達すると、射
出速度検出部６４で射出速度のモニタを開始する。射出
圧力制御による射出充填により、金型キャビティ内の充
満挙動に対応して射出速度は自然減速される。射出速度
検出部６４の検出信号がＫ値に達すると（設定速度到達
点Ｐ）、型締増圧を開始する（圧縮工程）。 型締増圧開始（射出・型締連動区間のスタート）と
同時に、型締力と射出圧力の同期制御を行なう。こうす
ることにより、型締動作による圧縮工程において、金型
キャビティ内から射出側への樹脂の逆流が防止でき、そ
の結果、逆流による成形品の変形は皆無となるうえ、逆
流防止のためのシャットオフバルブなどは不要となる。
なお、周期制御というのは、射出シリンダ内と金型キャ
ビティ内の樹脂圧バランスを保つことであり、型締によ
る圧縮条件（型締速度、型締圧力）を考慮して、射出シ
リンダが後退することがないように型締側と射出側の圧
力制御を同時に行なう。すなわち、型締力の増圧開始と
同時に射出圧力を増加し、金型キャビティ内の樹脂圧と
射出圧力を同等になるようにして樹脂の逆流を防止す
る。Timing control for starting the mold clamping pressure increase is performed based on the set values (points V and K). When the injection cylinder stroke reaches the monitoring start point V, the injection speed detection unit 64 starts monitoring the injection speed. By the injection filling by controlling the injection pressure, the injection speed is naturally reduced corresponding to the filling behavior in the mold cavity. When the detection signal of the injection speed detection unit 64 reaches the K value (set speed reaching point P), the mold clamping pressure increase is started (compression step). Simultaneously with the start of mold clamping pressure increase (start of the injection / mold clamping interlocking section), synchronous control of mold clamping force and injection pressure is performed. By doing so, it is possible to prevent resin backflow from the mold cavity to the injection side during the compression process due to the mold clamping operation, and as a result, there is no deformation of the molded product due to backflow, and there is a shutoff to prevent backflow. An off valve etc. is unnecessary.
In addition, the cycle control is to maintain the resin pressure balance in the injection cylinder and the mold cavity, and the injection cylinder retracts in consideration of the compression conditions (mold clamping speed, mold clamping pressure) due to the mold clamping. Pressure control on the mold clamping side and the injection side at the same time so that no That is, the injection pressure is increased at the same time when the mold clamping force starts to be increased, and the resin pressure in the mold cavity and the injection pressure are made equal to prevent the resin from flowing back.
【００１８】以上述べた型締増圧開始タイミング信号設
定を中心とする初期設定を完了した後、成形動作に入
る。成形動作では、図３に示すような下記の手順にした
がって実施する。After completing the above-mentioned initial setting centered on the mold clamping pressure increase start timing signal setting, the molding operation is started. The molding operation is performed according to the following procedure as shown in FIG.
【００１９】 移動シリンダ２を用いて可動盤２０な
どを固定盤１０側へ移動前進させる。両金型３０ａ、３
０ｂがタッチした後、移動シリンダ２の駆動を停止させ
る。 半割ナット開閉シリンダ２６を駆動させて、半割ナ
ット２２とタイバー７上のねじ部または溝部を完全に噛
合・固定させる。ここで前以て、両金型３０ａ、３０ｂ
の金型厚さ（ダイハイト値：Ｈ）とねじ部または溝部の
ピッチ（Ｐｉ）から、半割ナット２２とタイバー７上の
ねじ部または溝部が完全に噛合するように、あらかじめ
チェーンによって連結されたモータを回転させることで
スプロケットを回転させて調整軸の前後進移動量を調整
しておく。The movable platen 20 and the like are moved and moved forward to the fixed platen 10 side by using the moving cylinder 2. Both dies 30a, 3
After 0b is touched, the driving of the moving cylinder 2 is stopped. The half nut nut opening / closing cylinder 26 is driven to completely engage and fix the half nut 22 and the screw portion or groove portion on the tie bar 7. Here, in advance, both molds 30a, 30b
Based on the mold thickness (die height value: H) and the pitch (Pi) of the screw portion or groove portion, the half nut 22 and the screw portion or groove portion on the tie bar 7 were preliminarily connected by a chain so as to completely mesh with each other. The sprocket is rotated by rotating the motor to adjust the amount of forward and backward movement of the adjustment shaft.
【００２０】 充填された樹脂圧によって金型が開く
ことを許容する型締力設定値（Ｓ1 値）に基づいて、型
締制御部６６で油圧を制御して型締を行なう（初期型
締）。 初期型締完了後、充填可能な射出圧力制御で射出充
填を行なう。同時に先に設定した位置設定値（Ｖ点）お
よび比較設定値（Ｋ値）に基づいて、型締増圧を開始す
る。 射出シリンダストロークがＶ点に到達後、射出速度
検出部６４で射出圧力モニタを開始する。射出速度検出
部６４の検出信号がＫ値に達したことを検知後、比較制
御部６３は型締制御部６６へ型締増圧開始信号を同期制
御部６２を介して発信するとともに、タイマ６３ａを起
動させる。 同期制御部６２は、型締力と射出圧力の同期制御を
行ない、射出・型締連動の射出圧縮成形を行なう。Based on the mold clamping force setting value (S 1 value) that allows the mold to open due to the filled resin pressure, the mold clamping control unit 66 controls the hydraulic pressure to perform the mold clamping (initial mold clamping). ). After completion of the initial mold clamping, injection filling is performed by controlling the injection pressure capable of filling. At the same time, the mold clamping pressure increase is started based on the previously set position set value (point V) and comparison set value (K value). After the injection cylinder stroke reaches point V, the injection pressure detection unit 64 starts injection pressure monitoring. After detecting that the detection signal of the injection speed detection unit 64 has reached the K value, the comparison control unit 63 transmits a mold clamping pressure increase start signal to the mold clamping control unit 66 via the synchronization control unit 62 and the timer 63a. To start. The synchronous control unit 62 performs synchronous control of the mold clamping force and the injection pressure, and performs injection compression molding in conjunction with injection / mold clamping.
【００２１】 ここで、タイマ６３ａに計量開始時間
（ｔ1 ）、型締完了時間（ｔ2 ）をあらかじめ設定して
おく。なお、計量開始時間（ｔ1 ）は、ゲートシールの
時間を基準として設定し、型締完了時間（ｔ2 ）は、樹
脂温度、金型冷却能力、成形品形状などから樹脂の冷却
時間を算出して設定する。 タイマ６３ａのタイムアウト信号に基づいて、型締
増圧開始後の射出、型締の制御を行なう。Here, the measurement start time (t 1 ) and the mold clamping completion time (t 2 ) are set in advance in the timer 63a. The metering start time (t 1 ) is set based on the gate seal time, and the mold clamping completion time (t 2 ) is the resin cooling time calculated from the resin temperature, mold cooling capacity, molded product shape, etc. And set. Based on the time-out signal of the timer 63a, injection and mold clamping are controlled after starting the mold clamping pressure increase.
【００２２】[0022]
【発明の効果】以上述べたように、本発明においては、
下記のような優れた効果を発揮することができる。 （１）射出充填工程中の射出速度が充填完了近傍の範囲
内において、設定値に達したことを検知後、型締増圧を
開始して圧縮工程を行なうことにより、計量値、チェッ
クリング作動変動による充填量のバラツキや成形中の樹
脂温度の変動などの外乱因子に全く影響されずに、射出
機構側での充填挙動と金型キャビティ内の充満挙動の相
互関係が正確に検知でき、極めて高精度な射出圧縮成形
が制御できるため、高品質な成形品を安定して供給でき
る。 （２）圧縮工程は、射出圧力と型締圧力を同期制御させ
ることにより、金型キャビティから射出側への樹脂の逆
流が防止できるため、成形品の品質精度が極めて向上す
るとともに、逆流防止のためのシャットオフバルブなど
の省略によるコストダウンができる。 （３）樹脂の冷却固化収縮量を加算した樹脂量を充填可
能な射出圧力制御で射出充填することにより、理想的な
自然充填流れ（ナチュラルフロー）が自動的に得られる
ため制御の操作性が大幅に向上する。As described above, according to the present invention,
The following excellent effects can be exhibited. (1) After detecting that the injection speed in the injection filling process has reached the set value within the range near the completion of filling, the mold clamping pressure increase is started and the compression process is performed to perform the measured value and the check ring operation. It is possible to accurately detect the mutual relationship between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity without being affected by disturbance factors such as variations in the filling amount due to fluctuations and fluctuations in resin temperature during molding. Since high-precision injection compression molding can be controlled, high-quality molded products can be stably supplied. (2) In the compression process, since the backflow of the resin from the mold cavity to the injection side can be prevented by synchronously controlling the injection pressure and the mold clamping pressure, the quality accuracy of the molded product is greatly improved and the backflow is prevented. Therefore, the cost can be reduced by omitting the shutoff valve. (3) Since the ideal natural filling flow (natural flow) is automatically obtained by injection filling with the injection pressure control capable of filling the resin amount obtained by adding the resin cooling and solidification shrinkage amount, the control operability is improved. Greatly improved.
【図１】本発明の実施例に係る射出圧縮成形装置の全体
構成図である。FIG. 1 is an overall configuration diagram of an injection compression molding device according to an embodiment of the present invention.
【図２】本発明の実施例に係る射出充填動作説明図であ
る。FIG. 2 is an explanatory diagram of an injection filling operation according to the embodiment of the present invention.
【図３】本発明の実施例に係る射出圧縮成形方法のフロ
ーチャートである。FIG. 3 is a flowchart of an injection compression molding method according to an embodiment of the present invention.
１ 型締装置 ２ 移動シリンダ ３ 型締シリンダ ７ タイバー ８ ねじ部（溝部） １０ 固定盤（固定プラテン） ２０ 可動盤（可動プラテン） ２２ 半割ナット（ハーフナット） ２６ タイバー係止装置（半割ナット開閉シリンダ） ２８ 金型キャビティ ３０ａ 固定金型 ３０ｂ 可動金型 ４０ 射出装置 ４１ バレル ４２ スクリュ ４３ ホッパ ４４ ノズル ４６ 射出シリンダ ４７ 正逆転用モータ ４８ ピストン ６０ 制御部 ６１ 射出制御部 ６２ 同期制御部 ６３ 比較制御部 ６３ａ タイマ ６４ 射出速度検出部 ６５ 位置設定部 ６６ 型締制御部 ６７ 油圧制御弁 ６８ 油圧制御弁 ６８ａ 油圧供給源 ６８ｂ 油圧供給源 １００ 射出圧縮成形装置 Ｋ 射出速度比較設定値 Ｓ1 型締力設定値 Ｖ 位置設定値（モニタリング開始点） Ｅ 前進限 Ｐ 設定速度到達点 Ｐｉ ピッチ Ｈ ダイハイト値 ｔ1 計量開始時間 ｔ2 型締完了時間1 mold clamping device 2 moving cylinder 3 mold clamping cylinder 7 tie bar 8 screw part (groove part) 10 fixed plate (fixed platen) 20 movable plate (movable platen) 22 half nut (half nut) 26 tie bar locking device (half nut) Open / close cylinder) 28 Mold cavity 30a Fixed mold 30b Movable mold 40 Injection device 41 Barrel 42 Screw 43 Hopper 44 Nozzle 46 Injection cylinder 47 Forward / reverse rotation motor 48 Piston 60 Control unit 61 Injection control unit 62 Synchronous control unit 63 Comparative control Part 63a timer 64 injection speed detection part 65 position setting part 66 mold clamping control part 67 hydraulic control valve 68 hydraulic control valve 68a hydraulic pressure supply source 68b hydraulic pressure supply source 100 injection compression molding device K injection speed comparison set value S 1 mold clamping force setting Value V Position setting value (monitoring start point) E Forward limit P Setting speed Achievement point Pi Pitch H Die height value t 1 Weighing start time t 2 Mold clamping completion time
Claims (3)
かじめ樹脂の冷却固化収縮量を算出し、該収縮量を加算
した樹脂量を金型キャビティ内に充填可能な射出圧力制
御で射出充填するとともに、充填された樹脂圧によって
金型が開くことを許容する低い型締力をあらかじめ金型
に負荷させておき、射出充填工程中の射出機構の射出速
度が設定値まで減速されたことを検知したのち型締圧力
を増圧させるとともに、型締機構の型締圧力と射出機構
の射出圧力を同期制御することを特徴とする射出圧縮成
形方法。1. In a resin injection compression molding method, a cooling solidification shrinkage amount of the resin is calculated in advance, and the resin amount obtained by adding the shrinkage amount is injection-filled by injection pressure control capable of filling the mold cavity, and After the mold is preloaded with a low mold clamping force that allows the mold to open due to the filled resin pressure, it is detected that the injection speed of the injection mechanism during the injection filling process has been reduced to the set value. An injection compression molding method characterized in that the mold clamping pressure is increased and the mold clamping pressure of the mold clamping mechanism and the injection pressure of the injection mechanism are synchronously controlled.
出シリンダストロークの前進限と該前進限に至るまでの
射出充填完了近傍の領域の射出シリンダストローク位置
で行なう請求項１記載の射出圧縮成形方法。2. The injection compression according to claim 1, wherein the detection of the injection speed during the injection filling step is performed at the forward stroke limit of the injection cylinder stroke and the injection cylinder stroke position in the region near the completion of the injection filling up to the forward stroke limit. Molding method.
制御する射出制御部とを備え、射出充填工程中の射出速
度を検出する射出速度検出部と、射出速度の検出範囲を
設定する位置設定部と、前記射出速度検出部からの検出
信号に基づいて前記型締制御部へ型締増圧信号を発信さ
せる比較制御部と、型締圧力増圧後の型締圧力と射出圧
力を同期制御させる同期制御部とを備えてなる射出圧縮
成形装置。3. A mold clamping control unit for controlling mold clamping and an injection control unit for controlling injection filling, an injection speed detecting unit for detecting an injection speed during an injection filling process, and a detection range for the injection speed are set. Position setting section, a comparison control section for transmitting a mold clamping pressure increasing signal to the mold clamping control section based on a detection signal from the injection speed detecting section, a mold clamping pressure and an injection pressure after the mold clamping pressure is increased. An injection compression molding apparatus comprising: a synchronous control unit for synchronously controlling the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13627295A JP3154386B2 (en) | 1995-06-02 | 1995-06-02 | Injection compression molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13627295A JP3154386B2 (en) | 1995-06-02 | 1995-06-02 | Injection compression molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08323832A true JPH08323832A (en) | 1996-12-10 |
| JP3154386B2 JP3154386B2 (en) | 2001-04-09 |
Family
ID=15171321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13627295A Expired - Fee Related JP3154386B2 (en) | 1995-06-02 | 1995-06-02 | Injection compression molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3154386B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006042772A1 (en) * | 2004-10-20 | 2006-04-27 | Demag Ergotech Gmbh | Method for injection stamping a thermoplastic material |
| JP2018001732A (en) * | 2016-07-08 | 2018-01-11 | しげる工業株式会社 | Injection molding method and injection molding machine |
| JP2019093577A (en) * | 2017-11-20 | 2019-06-20 | 株式会社放電精密加工研究所 | Composite type resin molding device |
-
1995
- 1995-06-02 JP JP13627295A patent/JP3154386B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006042772A1 (en) * | 2004-10-20 | 2006-04-27 | Demag Ergotech Gmbh | Method for injection stamping a thermoplastic material |
| US7682550B2 (en) | 2004-10-20 | 2010-03-23 | Sumitomo (Shi) Demag Plastics Machinery Gmbh | Method of compression molding thermoplastic material |
| DE102004051324B4 (en) * | 2004-10-20 | 2016-07-28 | Sumitomo (Shi) Demag Plastics Machinery Gmbh | Process for injection-compression of thermoplastic material |
| JP2018001732A (en) * | 2016-07-08 | 2018-01-11 | しげる工業株式会社 | Injection molding method and injection molding machine |
| JP2019093577A (en) * | 2017-11-20 | 2019-06-20 | 株式会社放電精密加工研究所 | Composite type resin molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3154386B2 (en) | 2001-04-09 |
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