JPH08336873A - Method and apparatus for injection press molding - Google Patents
Method and apparatus for injection press moldingInfo
- Publication number
- JPH08336873A JPH08336873A JP14297795A JP14297795A JPH08336873A JP H08336873 A JPH08336873 A JP H08336873A JP 14297795 A JP14297795 A JP 14297795A JP 14297795 A JP14297795 A JP 14297795A JP H08336873 A JPH08336873 A JP H08336873A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- mold
- mold clamping
- pressure
- 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
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、金型を所定の隙間だけ
開いた状態に保持して、金型キャビティ内へ溶融樹脂を
充填し、充填完了後に型締装置で該隙間を閉じて圧縮を
行なう射出プレス成形方法および射出プレス成形装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention holds a mold with a predetermined gap open, fills a mold cavity with molten resin, and after completion of filling, closes the gap with a mold clamping device and compresses it. The present invention relates to an injection press molding method and an injection press molding apparatus that perform
【０００２】[0002]
【従来の技術】型締動作を制御して射出プレス成形を行
なう場合、型開量設定条件によっては、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
給するうえで重要な制御となる。従来の射出・型締連動
制御は以下のとおり実施されていた。 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。 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。 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。 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。2. Description of the Related Art When injection molding is controlled by controlling a mold clamping operation, a resin flow state in a mold cavity becomes discontinuous when switching between an injection filling process and a compression process depending on a mold opening setting condition. As a result, defects such as flow marks occur. Therefore, it is necessary to perform injection / mold 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 The conventional injection / mold clamping interlocking control was carried out as follows. Monitor the amount of retreat of the movable plate or the mold during injection filling, and when the amount of retreat ≥ the set value, or monitor the amount of change of the mold clamping drive force during injection filling and change ≥ the set value. Clamping operation is started when it reaches ... Clamping side signal reference. The filling state (for example, pressure and temperature) of the molten resin in the mold cavity during injection filling is monitored, and the mold clamping operation is started when the monitor value ≥ the set value ... Mold side signal reference. The stroke of the injection cylinder or injection screw during injection filling is monitored, and the mold clamping operation is started when the stroke position ≥ the set value ... Injection side signal reference. Completion of initial mold clamping operation, start of injection filling, etc.
The mold clamping operation is started based on the time-out signal of the timer that is started based on an arbitrary process during the molding process.
Timer signal reference.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の方法では各々、下記に示すような問題があっ
た。 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
填に伴な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。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、検出遅れなどを見込んで低目に設
定することも考えられるが、考慮の度合を判定する基準
はないため難しく、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、射出プレス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。特に、トグル機構を介
して型締を行なう射出成形機においては、単に型締を行
なう際には有利に作用するトグル特性が、トグル機構を
途中停止させた状態（トグルは屈折状態）で使用する射
出プレス成形では、逆に後退量あるいは型締駆動力の変
化量の検出には適していないと言える。However, each of such conventional methods has the following problems. The retreat behavior of the movable plate or the mold during the injection filling is due to the mold opening reaction force generated by the increase of the resin filled in the mold cavity by the injection filling and the mold clamping side that tries to maintain the set mold opening amount. It is caused by the balance with the controlled mold clamping force. Therefore, the retreat behavior greatly changes depending on the control state (control accuracy, responsiveness) of the mold clamping force. In addition, the movable plate and the mold (actually, they are integrally attached) have a considerable weight, and it is difficult to accurately express the mold reaction force associated with injection filling, and the responsiveness is high. Is also low. This remarkably affects the change of the mold clamping drive force, and as a result, the detection delay is generated in many cases, resulting in a control in which the optimum mold clamping start timing is deviated. In order to solve the above problems, it may be possible to set the setting value that is the reference for timing control to a low value in consideration of the detection delay, but it is difficult because there is no standard for determining the degree of consideration, and conversely By starting the mold clamping operation early due to down, the compression effect from both injection filling and mold clamping operation can achieve low distortion due to the effect of reducing the resin pressure in the mold cavity, which is one of the effects of injection press molding. It is expected to disappear. In particular, in an injection molding machine that performs mold clamping through a toggle mechanism, the toggle characteristic that is advantageous when simply performing mold clamping is used when the toggle mechanism is stopped halfway (the toggle is in a bent state). Conversely, it can be said that injection press molding is not suitable for detecting the amount of retreat or the amount of change in the mold clamping drive force.
【０００４】 上記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なら
びに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り付けるための金型への
特殊な加工が必要なことならびに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。Although it can be said that the detection accuracy is higher than the above method, all the detection signals from the detection sensors such as pressure and temperature are pinpoint measurement, and depending on the sensor mounting location (actually, due to the presence of the ejector pin, etc., It is very likely to make a completely different decision. 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. No significant merit can be found because both software and hardware for signal processing are complicated. In addition, the demerits are large because the molds need to be specially processed to attach the sensors to the molds, and the number of mounting steps is required for each mold.
【０００５】 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〜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、まだ計量値の変動や
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〜金型までの総合平均温度）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。 従来〜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
射出プレス成形の射出・型締連動制御には適応不十分で
ある。Since the filling behavior is directly detected at the position where the injection filling amount is controlled, the conventional method is used for the injection / mold clamping interlocking control in which the mold clamping operation is overlapped with the injection filling operation. It can be said that it is the most accurate control method. However, in the conventional method in which the timing control is performed only by the injection stroke position, since the detection method is a method in which the variation in the filling amount caused by the variation in the measured value and the variation in the operating state of the check ring is still included, the injection filling is performed. 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. Therefore, the fluctuation of the resin temperature (comprehensive average temperature from the injection cylinder to the mold) during molding is It is difficult to deal with, and it is impossible to stably supply high quality molded products. Although it is the simplest control method among conventional ones, it has the lowest control level, and therefore, when used alone, it is not sufficiently adapted for injection / mold clamping interlocking control in high precision injection press molding.
【０００６】[0006]
【課題を解決するための手段】以上のような課題を解決
するために、本発明の方法では、第１の発明では、油圧
式の型締シリンダを駆動させてトグル機構を介して型締
を行なう射出成形機を用いて金型を開閉する際、型締工
程では前記トグル機構が伸び切らない状態で金型を所定
の型開量位置に保持しておき、射出充填工程中の射出機
構の射出圧力が設定値に達したことを検知した後、前記
トグル機構を伸び切る方向へ延伸させて型締力を負荷さ
せるとともに、前記型締圧力と前記射出圧力を同期制御
させることとした。また、第２の発明では、第１の発明
において、あらかじめタイバーに組込んだ型締力検出部
を用いて両金型がタッチした状態を検知した後、トグル
機構と連結された型締シリンダのストロークの原点設定
を行ない、所定の型開量位置を該原点設定位置からの型
締シリンダ後退量により設定するとともに、射出充填工
程中は設定した後退位置に可動金型を保持することとし
た。さらに、第３の発明では、第２の発明や第３の発明
において、射出充填工程中の射出圧力の検知は、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中の射出シリンダストローク位置
で行なうこととした。そして、第４の発明では、第１の
発明ないし第３の発明において、射出充填工程は、あら
かじめ算出された樹脂の冷却固化収縮量を加算した樹脂
量を金型キャビティ内に充填し、射出圧力が設定値に達
するまでは射出速度制御で射出充填を行ない、該設定値
に達した後は射出圧力制御に切り替えて射出充填を行な
うようにした。また、第５の発明の射出プレス成形装置
は、型開量を設定する型開量設定部と、金型の型開量を
検出する型開量検出部と、型締シリンダのストロークを
検出する型締シリンダストロークセンサと、タイバーに
組込んだ型締力検出部の出力信号に基づいて型締シリン
ダのストロークを原点設定する金型タッチ点設定部と、
前記型開量設定部の設定値および前記型開量検出部の検
出信号ならびに前記型締シリンダストロークセンサの検
出信号を比較してトグル機構に連結された型締シリンダ
のストロークを制御して型締を行なう型締制御部を備え
るとともに、射出充填操作を司る射出制御部を具備し、
かつ、射出充填工程中の射出圧力を検出する射出圧力検
出部と、射出圧力の検出範囲を設定する位置設定部と、
該射出圧力検出部からの検出信号に基づいて前記型締制
御部へ型締開始信号および前記射出制御部へ速度／圧力
切替信号を発信させる比較制御部と、型締開始後の型締
圧力と射出圧力を同期制御させる同期制御部を備えてな
る構成とした。In order to solve the above-mentioned problems, in the method of the present invention, in the first invention, a hydraulic mold clamping cylinder is driven to perform mold clamping through a toggle mechanism. When opening and closing the mold using an injection molding machine, the mold is held at a predetermined mold opening position in a state where the toggle mechanism is not fully extended in the mold clamping process, and the injection mechanism of the injection mechanism during the injection filling process is held. After detecting that the injection pressure has reached the set value, the toggle mechanism is extended in the full extension direction to apply the mold clamping force, and the mold clamping pressure and the injection pressure are synchronously controlled. According to a second aspect of the present invention, in the first aspect of the present invention, after detecting the state where both molds are touched by using the mold clamping force detection unit that is incorporated in the tie bar in advance, the mold clamping cylinder of the toggle mechanism is connected. The origin of the stroke is set, a predetermined mold opening amount position is set by the mold clamping cylinder retracted amount from the origin set position, and the movable mold is held at the set retracted position during the injection filling process. Furthermore, in the third invention, in the second invention or the third invention, the detection of the injection pressure during the injection filling process is performed in the forward limit of the injection cylinder stroke and a region near the completion of the injection filling until reaching the forward limit. It was decided to perform it at the injection cylinder stroke position in the. According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the injection filling step is performed by filling a mold cavity with a resin amount obtained by adding a cooling solidification shrinkage amount of the resin calculated in advance, Until the set value is reached, injection filling is performed by injection speed control, and after reaching the set value, injection pressure control is switched to perform the injection filling. Further, the injection press molding apparatus of the fifth invention detects a die opening amount setting unit that sets the die opening amount, a die opening amount detection unit that detects the die opening amount of the die, and a stroke of the mold clamping cylinder. The mold clamping cylinder stroke sensor and the mold touch point setting unit that sets the stroke of the mold clamping cylinder to the origin based on the output signal of the mold clamping force detection unit incorporated in the tie bar,
The set value of the mold opening amount setting unit, the detection signal of the mold opening amount detection unit, and the detection signal of the mold clamping cylinder stroke sensor are compared to control the stroke of the mold clamping cylinder connected to the toggle mechanism to perform the mold clamping. In addition to having a mold clamping control unit that performs
And, an injection pressure detection unit that detects the injection pressure during the injection filling process, a position setting unit that sets the detection range of the injection pressure,
A comparison control unit for transmitting a mold clamping start signal to the mold clamping control unit and a speed / pressure switching signal to the injection control unit based on a detection signal from the injection pressure detection unit, and a mold clamping pressure after starting the mold clamping. It is configured to include a synchronization control unit for synchronously controlling the injection pressure.
【０００７】[0007]
【作用】射出充填工程中の射出機構の射出圧力が設定値
に達したことを検知した後、型締動作を開始して圧縮工
程を行なうことにより、射出・型締連動制御における型
締動作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、さらにはタイミング信号
として射出シリンダ油圧（射出駆動力）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。その結果、計量値や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、高精度射出
プレス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。[Operation] After detecting that the injection pressure of the injection mechanism has reached the set value during the injection filling process, the mold clamping operation is started and the compression step is performed to start the mold clamping operation in the injection / mold clamping interlocking control. Of the molten resin in the mold cavity by directly detecting the detection of the timing signal at the location where the injection filling process is controlled, and by using the change amount of the injection cylinder hydraulic pressure (injection driving force) as the timing signal. By also detecting the filling behavior of, the filling behavior of the resin from the injection mechanism side to the inside of the mold cavity can be comprehensively grasped, and extremely accurate injection / mold clamping interlocking control can be realized. As a result, high-precision injection press molding can be controlled without being affected by disturbance factors such as variations in the filling amount caused by fluctuations in the measured value or operation of the check ring, fluctuations in resin temperature during molding, etc. It is possible to stably supply various molded products.
【０００８】また、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原点とこの前進限に至るまでの射
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。
さらに、型締開始までの射出充填工程は射出速度制御で
行ない、型締開始以降は射出圧力制御に切替えるととも
に、型締圧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。Further, the timing signal is detected within the range of the injection cylinder stroke forward limit within the vicinity of the origin and the completion of the injection filling until reaching the forward limit, whereby the filling behavior on the injection mechanism side and the mold cavity Since the timing control of the mold clamping start can be performed in the region where the mutual relationship of the filling behavior can be detected most accurately, the injection / mold clamping interlocking control in which the mold clamping operation overlaps the injection filling operation can be accurately realized.
Furthermore, the injection filling process up to the mold clamping start is performed by injection speed control, and after the mold clamping start is switched to injection pressure control, and synchronous control of the mold clamping pressure and injection pressure is performed, so that the compression process by the mold clamping operation is performed. Since the backflow of the resin from the mold cavity to the injection side, which has been a problem in the past, can be prevented, the weight of the molded product is stable, and the deformation of the molded product caused by the backflow of the resin can also be prevented and high quality is achieved. A 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.
【０００９】[0009]
【実施例】以下図面に基づいて本発明の実施例の詳細に
ついて説明する。図１〜図４は本発明に係り、図１は射
出成形機の全体構成図、図２は射出プレス成形方法の初
期型締条件設定手順を示すフローチャート、図３は射出
プレス成形方法の射出充填動作説明図、図４は射出プレ
ス成形方法の成形動作を示すフローチャートである。Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to the present invention, FIG. 1 is an overall configuration diagram of an injection molding machine, FIG. 2 is a flowchart showing an initial mold clamping condition setting procedure of an injection press molding method, and FIG. 3 is injection filling of the injection press molding method. FIG. 4 is an operation explanatory diagram, and FIG. 4 is a flowchart showing a molding operation of the injection press molding method.
【００１０】図１の射出成形機１００の上半分は、型締
前の型開状態を示し、下半分は型締完了後の型閉状態を
示す。図１に示すように、射出プレス成形を行なう射出
成形機１００は、大別すると型締装置２０と射出装置４
０と制御部６０とから構成され、型締装置２０は、リン
クハウジング１、固定盤２、可動盤３、型締シリンダ
８、トグル機構６（トグルリンク６ａ、ミッドリンク６
ｂ、クロスヘッドリンク６ｃ）、クロスヘッド７、ピス
トンロッド９、ガイドロッド１０、金型４（可動金型４
ａ、固定金型４ｂ）、キャビティ５、タイバー１１など
から構成される。The upper half of the injection molding machine 100 in FIG. 1 shows the mold open state before the mold clamping, and the lower half shows the mold closed state after the completion of the mold clamping. As shown in FIG. 1, an injection molding machine 100 that performs injection press molding is roughly classified into a mold clamping device 20 and an injection device 4.
0 and a control unit 60, the mold clamping device 20 includes a link housing 1, a fixed platen 2, a movable platen 3, a mold clamping cylinder 8, a toggle mechanism 6 (toggle link 6a, mid link 6).
b, crosshead link 6c), crosshead 7, piston rod 9, guide rod 10, mold 4 (movable mold 4)
a, a fixed mold 4b), a cavity 5, a tie bar 11 and the like.
【００１１】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.
【００１２】つぎに、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、射出圧力検出部６４、位置設定
部６５、および型締制御部７３、型締シリンダストロー
クセンサ７４、型開量検出部７５、型開量設定部７６、
型締力検出部７７、金型タッチ点設定部７８、ならびに
圧力センサ６６、油圧制御弁６７ａ、６７ｂ、油圧供給
源６８ａ、６８ｂなどから構成される。そして、射出制
御部６１は油圧制御弁６７ａを介して正逆転用モータ４
７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の射出圧力検出部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、射出圧力検出部６４
は位置設定部６５と接続される。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 pressure detection unit 64, a position setting unit 65, a mold clamping control unit 73, a mold clamping cylinder stroke sensor 74, and a mold opening. Amount detection unit 75, mold opening amount setting unit 76,
The mold clamping force detection unit 77, the mold touch point setting unit 78, the pressure sensor 66, the hydraulic pressure control valves 67a and 67b, and the hydraulic pressure supply sources 68a and 68b are included. Then, the injection control unit 61 controls the forward / reverse rotation motor 4 via the hydraulic control valve 67a.
In addition to being connected to a control device (not shown) that controls the operation of 7, the synchronization control unit 62 is also connected. The synchronization control unit 62 is connected to the injection pressure 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 pressure detection unit 64.
Is connected to the position setting unit 65.
【００１３】一方、型締制御部７３は同期制御部６２と
接続されるとともに、型開量設定部７６とも接続され油
圧制御弁６７ｂへ動作指令を発信する。型開量設定部７
６は、タイバー１１に組込まれた型締力検出部７７と金
型タッチ点設定部７８を介して接続されるとともに、可
動盤３位置でエンコーダやリニアスケールなどにより型
開量を検出する型開量検出部７５とも接続され、さら
に、型締シリンダ８のピストンロッド９に取り付けられ
た型締シリンダストロークセンサ７４とも接続される。
型締シリンダストロークセンサ７４もエンコーダやリニ
アスケールが採用される。On the other hand, the mold clamping control section 73 is connected to the synchronous control section 62 and also connected to the mold opening amount setting section 76 to issue an operation command to the hydraulic control valve 67b. Mold opening amount setting section 7
6 is connected to a mold clamping force detection unit 77 incorporated in the tie bar 11 via a mold touch point setting unit 78, and a mold opening for detecting the mold opening amount by an encoder or a linear scale at the movable platen 3 position. It is also connected to the amount detecting section 75, and further connected to the mold clamping cylinder stroke sensor 74 attached to the piston rod 9 of the mold clamping cylinder 8.
An encoder or a linear scale is also used for the mold clamping cylinder stroke sensor 74.
【００１４】このように構成された射出成形機１００に
おける射出プレス成形方法の操作手順について次に説明
する。図２は、初期型締条件設定の操作手順を示すもの
で、型開型締条件の設定は、下記のとおりの手順にて行
なう。 （１）型締制御部７３で油圧制御弁６７ｂを制御して型
締を行なう。 （２）タイバー１１に組込んだ型締力検出部７７で型締
動作中の金型タッチ状態を検知し、金型タッチ点として
金型タッチ点設定部７８へ記憶させるとともに、トグル
機構６と連結される型締シリンダストロークおよび型開
量検出部７５の検出信号を原点設定する。タイバー１１
に組込んだ型締力検出部７７のメリットを述べると、下
記のようになる。 トグル機構６の型締力の発生原理であるタイバー１
１の延伸（応力）挙動を直接計測しているので、最も計
測精度は高い。 金型取付部とは無関係の位置なので、取扱性が極め
て良好である。 （３）型開量設定部７６の型開量設定値（Ｓ値）に基づ
いて、可動金型４ａを後退動作させる。 （４）型開量検出部７５の検出信号が設定値（Ｓ値）に
達したとき、Ｓ値まで可動金型４ａを後退させたときの
型締シリンダストロークを型締シリンダストロークセン
サ７４で検出して、初期型締制御設定値（Ｓ1 値）とし
て型開量設定部７６へ記憶させる。 （５）成形動作においては、Ｓ1 値をキープするように
型締シリンダ油圧を制御して型開量設定値（Ｓ値）制御
を行なう（型締シリンダ位置保持制御）。ここで、トグ
ル機構６の特性（型締シリンダストローク（図１中、
Ｓ）が、例えば１ｍｍ変動したとしても、可動盤の位置
変動（図１中、ｔ）は１／１０ｍｍ以下であり、型開量
の設定精度は極めて高い。実際には、型締シリンダスト
ロークは１／１０ｍｍの精度で保持できる。）により、
極めて高精度、かつ再現性の高い型開量制御が容易にで
きる。The operation procedure of the injection press molding method in the injection molding machine 100 thus constructed will be described below. FIG. 2 shows an operation procedure for setting initial mold clamping conditions. The mold opening mold clamping conditions are set in the following procedure. (1) The mold clamping control unit 73 controls the hydraulic control valve 67b to perform mold clamping. (2) The mold clamping force detection unit 77 incorporated in the tie bar 11 detects the mold touch state during the mold clamping operation, stores it in the mold touch point setting unit 78 as a mold touch point, and the toggle mechanism 6 The origin is set for the connected mold clamping cylinder stroke and the detection signal of the mold opening amount detection unit 75. Tie bar 11
The merits of the mold clamping force detection unit 77 incorporated in are as follows. Tie bar 1 which is the principle of generating the mold clamping force of the toggle mechanism 6.
Since the stretching (stress) behavior of No. 1 is directly measured, the measurement accuracy is highest. Since it is a position unrelated to the die mounting part, it is extremely easy to handle. (3) The movable mold 4a is moved backward based on the mold opening amount setting value (S value) of the mold opening amount setting unit 76. (4) When the detection signal of the mold opening amount detection unit 75 reaches the set value (S value), the mold clamping cylinder stroke sensor 74 detects the mold clamping cylinder stroke when the movable mold 4a is retracted to the S value. Then, it is stored in the mold opening amount setting section 76 as the initial mold clamping control setting value (S1 value). (5) In the molding operation, the mold clamping cylinder hydraulic pressure is controlled so as to keep the S1 value, and the mold opening amount set value (S value) is controlled (mold clamping cylinder position holding control). Here, the characteristics of the toggle mechanism 6 (mold clamping cylinder stroke (in FIG. 1,
Even if S) varies by 1 mm, for example, the position variation of the movable plate (t in FIG. 1) is 1/10 mm or less, and the setting accuracy of the mold opening amount is extremely high. In practice, the mold clamping cylinder stroke can be maintained with an accuracy of 1/10 mm. ),
It is possible to easily perform mold opening control with extremely high accuracy and high reproducibility.
【００１５】次に、型締開始タイミング信号設定につい
て、図３に基づいて説明する。その手順は、下記どおり
である。 （１）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）と射出速度（１段または多段
射出速度）の設定値に基づいて射出充填を行なう。 （２）型締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の近傍に選び、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で設定する。
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。 （３）同時に、型締開始のタイミング信号を射出機構側
の射出圧力で比較設定値（Ｋ値）として比較制御部６３
で設定する。タイミング信号を射出圧力で設定すること
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。 （４）上記設定値（Ｖ点、Ｋ値）に基づいて、型締開始
の制御を行なう。射出シリンダストロークがモニタリン
グ開始点（Ｖ点）に達すると射出圧力検出部６４で射出
圧力のモニタを開始する。金型キャビティ内の充満挙動
に伴ない、設定された射出速度を保持するために射出圧
力は増加を必要とし、射出圧力検出部６４の検出信号が
Ｋ値に達すると（設定圧力到達点Ｐに達すると）射出充
填動作を射出速度制御から射出圧力制御へ切替えるとと
もに（これをＶＰ切替という）、型締動作を開始する
（圧縮工程）。 （５）型締開始（射出、型締連動区間のスタート）と同
時に、型締圧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は防止でき、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、同期制御というのは、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ことである。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
の樹脂圧力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。Next, the mold clamping start timing signal setting will be described with reference to FIG. The procedure is as follows. (1) 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 speed (single-stage or multi-stage injection velocity). (2) Select a range for detecting the timing signal of the mold clamping start near the forward limit of the injection cylinder stroke, and perform injection near the end of injection filling up to the forward limit (point E) and the forward limit (point E). The cylinder stroke position is set by the position setting unit 65 as a position set value (monitoring start point V).
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. (3) At the same time, the comparison control unit 63 sets the timing signal for starting the mold clamping as the comparison set value (K value) by the injection pressure on the injection mechanism side.
Set with. By setting the timing signal with the injection pressure, the injection mechanism side can comprehensively understand the filling behavior of the resin in the mold cavity, so there are variations in the filling value due to fluctuations in the measured value, check ring operation, and during molding. Without being affected by disturbance factors such as fluctuations in resin temperature,
Stable and highly accurate timing signal detection is possible. (4) Control of mold clamping start is performed based on the set values (point V, value K). When the injection cylinder stroke reaches the monitoring start point (point V), the injection pressure detector 64 starts monitoring the injection pressure. With the filling behavior in the mold cavity, the injection pressure needs to be increased in order to maintain the set injection speed, and when the detection signal of the injection pressure detection unit 64 reaches the K value (at the set pressure arrival point P When it reaches, the injection filling operation is switched from the injection speed control to the injection pressure control (this is called VP switching), and the mold clamping operation is started (compression step). (5) Simultaneous control of mold clamping pressure and injection pressure is performed at the same time when mold clamping is started (injection, start of mold clamping interlocking section). 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.
The synchronous control is to maintain the resin pressure balance in the injection cylinder and the mold cavity, and the injection cylinder moves backward in consideration of the compression conditions (mold clamping speed, mold clamping pressure) due to the mold clamping. To prevent this, pressure control on the mold clamping side and the injection side is performed simultaneously. That is, the injection pressure is increased at the same time when the mold clamping force is started to be increased, and the resin pressure in the mold cavity is made equal to the injection pressure to prevent the reverse flow of the resin.
【００１６】以上のようにして、初期条件の設定が完了
した後、実操業の成形運転に入るが、その操作手順は、
図４に示すように、下記の手順により行なう。 （１）先に設定した型開量設定値（Ｓ1 値）に基づいて
型締を行なう。 （２）型締完了後、射出充填を行なう。同時に、ともに
設定した位置設定値（Ｖ点）、比較設定値（Ｋ値）に基
づいて、型締開始のタイミング制御を行なう。 （３）射出シリンダストロークがＰ値に達した後、射出
圧力検出部６４で射出圧力のモニタを開始する。 （４）射出圧力検出部６４の検出信号がＶ点に達したこ
とを検知した後、比較制御部６３は射出制御部６１へ速
度／圧力切替（ＶＰ切替）信号を、型締制御部へ型締開
始信号を同期制御部６２を介して各々発信するととも
に、タイマを起動させる。 （５）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・型締連動の射出プレス成形を行なう。 （６）ここで、タイマに計量開始時間（ｔ1 ）、型締完
了時間（ｔ2 ）をあらかじめ設定しておく。すなわち、
計量開始時間ｔ1 は、ゲートシールの時間を基準として
設定するものとし、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。 （７）タイマのタイムアウト信号に基づいて、型締開始
後の射出、型締の制御を行なう。After the initial conditions have been set as described above, the molding operation of the actual operation is started. The operation procedure is as follows.
As shown in FIG. 4, the procedure is as follows. (1) Clamping is performed based on the previously set mold opening amount setting value (S1 value). (2) After completion of mold clamping, injection filling is performed. At the same time, the mold clamping start timing control is performed based on the position setting value (point V) and the comparison setting value (K value) both set. (3) After the injection cylinder stroke reaches the P value, the injection pressure detection unit 64 starts monitoring the injection pressure. (4) After detecting that the detection signal of the injection pressure detection unit 64 has reached the point V, the comparison control unit 63 sends a speed / pressure switching (VP switching) signal to the injection control unit 61 and a mold clamping control unit. A tightening start signal is transmitted via the synchronization control unit 62 and a timer is started. (5) The synchronous control unit 62 performs synchronous control of the mold clamping force and the injection pressure, and performs injection press molding interlocking with injection and mold clamping. (6) Here, the metering start time (t 1 ) and the mold clamping completion time (t 2 ) are preset in the timer. That is,
The measurement start time t 1 is set based on the gate seal time, and the mold clamping completion time t 2 is set by calculating the resin cooling time from the resin temperature, mold cooling capacity, molded product shape, and the like. . (7) The injection and mold clamping are controlled after the mold clamping is started based on the time-out signal of the timer.
【００１７】[0017]
【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圧力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した後、型締動
作を開始して圧縮工程を行なうことにより、計量値やチ
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プレ
ス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
の不要によるコストダウンができる。 （３）タイバーに組込んだ型締力検出部で金型タッチ点
を設定するとともに、型締シリンダストロークの位置保
持制御により型開量保持を行なうことにより、極めて高
精度な型開量設定ができるため、高品質の成形品が供給
できる。As described above, according to the present invention,
The following excellent effects can be exhibited. (1) After detecting that the injection pressure during the injection and filling process reaches a set value within the range near the completion of filling, the mold clamping operation is started and the compression process is performed, whereby the measured value and the check ring operation are performed. Without being affected by disturbance factors such as variation of filling amount due to fluctuation and fluctuation of resin temperature during molding,
Since the mutual relationship between the filling behavior on the injection mechanism side and the filling behavior in the mold cavity can be accurately detected and the injection press molding can be controlled with extremely high precision, 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. It is possible to reduce costs by eliminating the need for a shut-off valve. (3) By setting the mold touch point with the mold clamping force detection part built into the tie bar, and maintaining the mold opening amount by the position holding control of the mold clamping cylinder stroke, it is possible to set the mold opening amount with extremely high accuracy. Therefore, high quality molded products can be supplied.
【図１】本発明の実施例に係る射出成形機の全体構成図
である。FIG. 1 is an overall configuration diagram of an injection molding machine according to an embodiment of the present invention.
【図２】本発明の実施例に係る射出プレス成形方法の初
期型締条件設定手順を示すフローチャートである。FIG. 2 is a flowchart showing an initial mold clamping condition setting procedure of the injection press molding method according to the embodiment of the present invention.
【図３】本発明の実施例に係る射出プレス成形方法の射
出充填動作説明図である。FIG. 3 is an explanatory diagram of an injection filling operation of the injection press molding method according to the embodiment of the present invention.
【図４】本発明の実施例に係る射出プレス成形方法の成
形動作を示すフローチャートである。FIG. 4 is a flowchart showing a molding operation of the injection press molding method according to the embodiment of the present invention.
１ リンクハウジング ２ 固定盤 ３ 可動盤 ４ 金型 ４ａ 可動金型 ４ｂ 固定金型 ５ キャビティ ６ トグル機構 ７ クロスヘッド ８ 型締シリンダ ９ ピストンロッド １０ ガイドロッド １１ タイバー ２０ 型締装置 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 射出圧力検出部 ６５ 位置設定部 ６６ 圧力センサ ６７ａ、６７ｂ 油圧制御弁 ６８ａ、６８ｂ 油圧供給源 ７３ 型締制御部 ７４ 型締シリンダストロークセンサ ７５ 型開量検出部 ７６ 型開量設定部 ７７ 型締力検出部 ７８ 金型タッチ点設定部 １００ 射出成形機 Ｋ 射出圧力比較設定値 Ｖ 位置設定値（モニタリング開始点） Ｅ 前進限 Ｐ 設定圧力到達点 Ｓ 型開量設定値 Ｓ1 型開量設定値 ｔ1 計量開始時間 ｔ2 型締完了時間1 link housing 2 fixed plate 3 movable plate 4 mold 4a movable mold 4b fixed mold 5 cavity 6 toggle mechanism 7 crosshead 8 mold clamping cylinder 9 piston rod 10 guide rod 11 tie bar 20 mold clamping device 40 injection device 41 barrel 42 Screw 43 Hopper 44 Nozzle 46 Injection cylinder 47 Forward / reverse motor 48 Piston 60 Control unit 61 Injection control unit 62 Synchronous control unit 63 Comparison control unit 63a Timer 64 Injection pressure detection unit 65 Position setting unit 66 Pressure sensor 67a, 67b Hydraulic control valve 68a, 68b Hydraulic pressure supply source 73 Mold clamping control unit 74 Mold clamping cylinder stroke sensor 75 Mold opening amount detection unit 76 Mold opening amount setting unit 77 Mold clamping force detection unit 78 Mold touch point setting unit 100 Injection molding machine K Injection pressure comparison Set value V Position set value (Start monitoring ) E forward limit P set pressure reaches point S type opening amount set value S1 type opening amount set value t 1 measurement start time t 2 Clamping completion time
Claims (5)
ル機構を介して型締を行なう射出成形機を用いて金型を
開閉する際、型締工程では前記トグル機構が伸び切らな
い状態で金型を所定の型開量位置に保持しておき、射出
充填工程中の射出機構の射出圧力が設定値に達したこと
を検知した後、前記トグル機構を伸び切る方向へ延伸さ
せて型締力を負荷させるとともに、前記型締圧力と前記
射出圧力を同期制御させることを特徴とする射出プレス
成形方法。1. When opening and closing a mold using an injection molding machine that drives a hydraulic mold clamping cylinder to perform mold clamping through a toggle mechanism, in the mold clamping step, the toggle mechanism is not fully extended. The mold is held at a predetermined mold opening position, and after it is detected that the injection pressure of the injection mechanism during the injection filling process has reached the set value, the toggle mechanism is extended in the full extension direction to close the mold. An injection press molding method characterized in that a force is applied and the mold clamping pressure and the injection pressure are synchronously controlled.
出部を用いて両金型がタッチした状態を検知した後、ト
グル機構と連結された型締シリンダのストロークの原点
設定を行ない、所定の型開量位置を該原点設定位置から
の型締シリンダ後退量により設定するとともに、射出充
填工程中は設定した後退位置に可動金型を保持すること
を特徴とする請求項１記載の射出プレス成形方法。2. After detecting the touching state of both molds by using the mold clamping force detection unit built in the tie bar in advance, the origin of the stroke of the mold clamping cylinder connected to the toggle mechanism is set, and the predetermined position is set. The injection press molding according to claim 1, wherein the mold opening amount position is set by the mold clamping cylinder retracted amount from the origin setting position, and the movable mold is held at the set retracted position during the injection filling process. Method.
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中の射出シリンダストローク
位置で行なう請求項１記載または請求項２記載の射出プ
レス成形方法。3. The injection pressure during the injection filling step is detected at the injection cylinder stroke position in the advance limit of the injection cylinder stroke and the region near the completion of the injection filling until reaching the advance limit. The injection press molding method according to claim 2.
樹脂の冷却固化収縮量を加算した樹脂量を金型キャビテ
ィ内に充填し、射出圧力が設定値に達するまでは射出速
度制御で射出充填を行ない、該設定値に達した後は射出
圧力制御に切り替えて射出充填を行なう請求項１記載な
いし請求項３記載の射出プレス成形方法。4. The injection filling step fills a mold cavity with a resin amount obtained by adding a cooling solidification shrinkage amount of the resin calculated in advance, and injection filling is performed by injection speed control until the injection pressure reaches a set value. The injection press molding method according to claim 1, wherein the injection press molding is performed by switching to the injection pressure control after reaching the set value.
の型開量を検出する型開量検出部と、型締シリンダのス
トロークを検出する型締シリンダストロークセンサと、
タイバーに組込んだ型締力検出部の出力信号に基づいて
型締シリンダのストロークを原点設定する金型タッチ点
設定部と、前記型開量設定部の設定値および前記型開量
検出部の検出信号ならびに前記型締シリンダストローク
センサの検出信号を比較してトグル機構に連結された型
締シリンダのストロークを制御して型締を行なう型締制
御部を備えるとともに、射出充填操作を司る射出制御部
を具備し、かつ、射出充填工程中の射出圧力を検出する
射出圧力検出部と、射出圧力の検出範囲を設定する位置
設定部と、該射出圧力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開始信号および前記射出制御部へ
速度／圧力切替信号を発信させる比較制御部と、型締開
始後の型締圧力と射出圧力を同期制御させる同期制御部
を備えてなる射出プレス成形装置。5. A mold opening amount setting unit for setting a mold opening amount, a mold opening amount detecting unit for detecting a mold opening amount of a mold, and a mold clamping cylinder stroke sensor for detecting a stroke of a mold clamping cylinder.
The mold touch point setting unit that sets the origin of the stroke of the mold clamping cylinder based on the output signal of the mold clamping force detection unit incorporated in the tie bar, the set value of the mold opening amount setting unit and the mold opening amount detection unit. Injection control that controls the stroke of the mold clamping cylinder connected to the toggle mechanism to perform mold clamping by comparing the detection signal and the detection signal of the mold clamping cylinder stroke sensor, and injection control that controls injection filling operation And a position setting section for setting a detection range of the injection pressure, and the mold based on a detection signal from the injection pressure detection section. Injection comprising a comparison control unit for transmitting a mold clamping start signal to the clamping control unit and a speed / pressure switching signal to the injection control unit, and a synchronization control unit for synchronously controlling the mold clamping pressure and the injection pressure after the mold clamping is started. Less molding apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07142977A JP3128051B2 (en) | 1995-06-09 | 1995-06-09 | Injection press molding method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07142977A JP3128051B2 (en) | 1995-06-09 | 1995-06-09 | Injection press molding method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08336873A true JPH08336873A (en) | 1996-12-24 |
| JP3128051B2 JP3128051B2 (en) | 2001-01-29 |
Family
ID=15328064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07142977A Expired - Lifetime JP3128051B2 (en) | 1995-06-09 | 1995-06-09 | Injection press molding method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3128051B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001287252A (en) * | 2000-04-07 | 2001-10-16 | Nok Corp | Injection molding apparatus and control method therefor |
-
1995
- 1995-06-09 JP JP07142977A patent/JP3128051B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001287252A (en) * | 2000-04-07 | 2001-10-16 | Nok Corp | Injection molding apparatus and control method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3128051B2 (en) | 2001-01-29 |
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