JP2006192818A - Injection controlling method of injection molding machine and its injection device - Google Patents

Injection controlling method of injection molding machine and its injection device Download PDF

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JP2006192818A
JP2006192818A JP2005008520A JP2005008520A JP2006192818A JP 2006192818 A JP2006192818 A JP 2006192818A JP 2005008520 A JP2005008520 A JP 2005008520A JP 2005008520 A JP2005008520 A JP 2005008520A JP 2006192818 A JP2006192818 A JP 2006192818A
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injection
screw
switching position
holding pressure
holding
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JP4248504B2 (en
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Makoto Yukihiro
誠 行広
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Japan Steel Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection controlling method of an injection molding machine which enables a stable accurate molding even on a molded product so small as not to be fully molded by the conventional in-line screw type molding machine, and to provide its injection device. <P>SOLUTION: The molding of multiple times (for example 2-3 shots) is performed to one time of the metering/plasticization process, and, where deemed necessary, corrections, such as an injection speed change-over position, a dwelling change-over position and an amount of the suck back, are performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、射出成形機の射出制御方法およびその射出装置に関するものである。     The present invention relates to an injection control method for an injection molding machine and an injection apparatus therefor.

従来のインラインスクリュ式射出成形機では、可塑化計量工程において設定された計量完了位置でスクリュ回転を停止した後、ノズル先端からのドルーリング防止のために計量完了位置よりも後方にスクリュを下げるサックバック工程を行い、次ショットの射出開始までその位置を保持する。   In a conventional inline screw type injection molding machine, after stopping the screw rotation at the measurement completion position set in the plasticization measurement process, the screw lowers the screw behind the measurement completion position to prevent drooling from the nozzle tip. A back process is performed and the position is held until the start of the next shot injection.

そして、溶融された樹脂を金型キャビティに充填する充填工程は、サックバック完了位置から保圧切換位置までスクリュを前進させる射出工程と、保圧切換位置以降は金型内溶融樹脂の冷却に伴う補填を行う保圧工程とで構成される。保圧工程後はスクリュ先端の圧力を一旦零まで降下させた後スクリュを回転して計量可塑化工程に入る(例えば、特許文献1,2参照。)。
特開2000−343571号公報 特開平6−182832号公報
The filling process for filling the mold cavity with the melted resin involves an injection process for moving the screw from the suck back completion position to the holding pressure switching position, and cooling of the molten resin in the mold after the holding pressure switching position. And a pressure-holding process for performing compensation. After the pressure holding step, the pressure at the screw tip is once lowered to zero, and then the screw is rotated to enter the metering plasticization step (see, for example, Patent Documents 1 and 2).
JP 2000-343571 A JP-A-6-182832

従来の射出装置と金型キャビティへの充填工程は以上のように構成されており、特許文献1の段落[0002]に、「…予め定められた射出容量を有しており、一定の射出容量で成形される製品を…」と記載され、特許文献2の段落[0003]にも、「…計量工程において計量される樹脂容量は1個の成形品に必要とされる樹脂容量に相当し、…」と記されているように、スクリュは成形品の重量に見合ったサイズが選択されるが、スクリュの最小径はスクリュ形状と材料と作用圧力に伴う強度上の関係からφ14〜φ16が一般的に限界である。   The conventional injection apparatus and the filling process into the mold cavity are configured as described above. In paragraph [0002] of Patent Document 1, “... has a predetermined injection capacity and a constant injection capacity is provided. In the paragraph [0003] of Patent Document 2, the resin capacity measured in the weighing process corresponds to the resin capacity required for one molded product, As indicated by "...", the size of the screw is selected according to the weight of the molded product, but the minimum diameter of the screw is generally φ14 to φ16 due to the screw shape, the strength of the material and the working pressure. Is a limit.

小さい成形品の場合はφ14〜φ16のスクリュが選択されるが、非常に小さい成形品では(計量完了位置−保圧切換位置)が非常に小さくなる。
保圧工程は、金型キャビティへの充填圧が発生するのでスクリュ先端からノズル先端までの樹脂が圧縮されているために、保圧工程後はスクリュ先端の圧力を一旦零まで降下させるが、圧力を降下させるためには圧力が加わった保圧工程完了時のスクリュ位置からスクリュを後退させる。この後退動作をスプリングバックと呼ぶ。
In the case of a small molded product, a φ14 to φ16 screw is selected. However, in a very small molded product, the (measurement completion position-holding pressure switching position) becomes very small.
In the pressure holding process, the pressure from the screw tip to the nozzle tip is compressed because the filling pressure into the mold cavity is generated, so after the pressure holding process, the pressure at the screw tip is once lowered to zero. To lower the screw, the screw is moved backward from the screw position at the time when the pressure holding process is completed. This backward movement is called spring back.

射出圧および保圧力が高い場合はスクリュ先端の溶融樹脂の圧力量が大きくなるため、スプリングバック量も大きくなるので、非常に小さい成形品では(計量完了位置−スプリングバック位置)値が非常に小さくなり、計量密度のバラツキやスプリングバック位置のバラツキによっては(スプリングバック位置>計量完了位置)となる。計量完了位置を越えると次ショット用の計量可塑化工程が不要となるので計量可塑化工程を行わないショットが発生し、毎ショットの計量樹脂密度が不安定となる問題がある。   When the injection pressure and holding pressure are high, the amount of molten resin at the screw tip increases, so the amount of springback also increases. Therefore, the value of (measurement completion position-springback position) is very small for very small molded products. Thus, depending on the variation in the measurement density and the variation in the spring back position, the spring back position> the measurement completion position. When the measurement completion position is exceeded, there is no need for the measurement plasticizing process for the next shot, and therefore, there is a problem that the shot without the measurement plasticizing process is generated and the density of the measured resin in each shot becomes unstable.

図4(c)は従来のスクリュ位置に関する設定値の一例であり、ここで、射出保圧工程中のスクリュ位置の設定とその問題点について説明する。
射出保圧工程でのスクリュ最前進位置Dをスクリュ前進限位置G以上とし、金型キャビティに充満できる充分なる溶融樹脂が得られる計量完了位置Bまで材料を計量し、ノズル先端からのドルーリング防止としてのサックバック完了位置Aまでスクリュを後退させ、金型を閉じた後保圧切換位置Cまで速度制御で射出し、保圧切換位置に達した後は圧力制御に切り換えて保圧を加えて金型キャビティ内に溶融樹脂を充填して成形する。
FIG. 4C is an example of a setting value related to a conventional screw position. Here, setting of the screw position during the injection pressure holding process and its problems will be described.
Prevents drooling from the nozzle tip by measuring the material up to the measurement completion position B where the screw maximum advance position D in the injection pressure holding process is equal to or higher than the screw advance limit position G and sufficient molten resin can be filled in the mold cavity. The screw is moved backward to the suck back completion position A, and after closing the mold, it is injected by speed control to the holding pressure switching position C. After reaching the holding pressure switching position, the pressure is switched to pressure control and holding pressure is applied. Mold is filled with molten resin in the mold cavity.

保圧工程が完了すると一旦圧力零まで圧抜きし、スクリュはスプリングバック位置Eまで後退する。その後にスクリュを回転して計量完了位置Bまで計量可塑化する。   When the pressure holding process is completed, the pressure is once released to zero, and the screw moves back to the spring back position E. Thereafter, the screw is rotated and plasticized to the weighing completion position B.

ここで、上述したように、小さい成形品の場合は製造可能な最小径であるφ14〜φ16のスクリュが選択されるが、非常に小さい成形品では(計量完了位置−保圧切換位置)が非常に小さくなる。   Here, as described above, in the case of a small molded product, a screw having a minimum diameter of φ14 to φ16 is selected, but in the case of a very small molded product, (measurement completion position−holding pressure switching position) is extremely high. Becomes smaller.

したがって、従来技術で説明したような、計量密度バラツキやスプリングバック精度によっては(スプリングバック位置>計量完了位置)となるショットが発生する。この場合、計量完了位置を越えているので次ショット用の計量可塑化が不要となり、計量可塑化工程の有無によって毎ショットの計量密度が不安定となる問題がある。   Therefore, a shot that satisfies (spring back position> measurement completion position) occurs depending on the measurement density variation and the spring back accuracy as described in the prior art. In this case, since the measurement completion position is exceeded, measurement plasticization for the next shot becomes unnecessary, and there is a problem that the measurement density of each shot becomes unstable depending on the presence or absence of the measurement plasticization process.

また、(計量完了位置−スプリングバック位置)値が非常に小さいと、次ショット用の計量可塑化中のスクリュ回転量が小さすぎて安定した計量ができないと言う問題がある。   Further, if the value of (measurement completion position−spring back position) is very small, there is a problem that the amount of screw rotation during the plasticization for the next shot is too small to perform stable measurement.

その結果、連続して安定した成形品を得ることができないという問題がある。   As a result, there is a problem that a continuously stable molded product cannot be obtained.

特許文献2の技術によれば、上述した問題を解決するため、1回の計量工程に対して複数回の射出工程を行うようにしているが、1回目のショットとその後の連続するショットにおいて、それぞれ射出速度切換位置や保圧切換位置、更にはサックバック量等についてどのように扱うかについて何等開示がされておらず、この技術をそのまま適用したのでは、やはり精度の高い成形を行うことができない。   According to the technique of Patent Document 2, in order to solve the above-described problem, a plurality of injection steps are performed for one weighing step. However, in the first shot and subsequent shots, There is no disclosure about how to handle the injection speed switching position, the holding pressure switching position, and the suck back amount, etc., and if this technology is applied as it is, high-precision molding can still be performed. Can not.

この発明は上記のような従来の問題を解決するために成されたもので、1回の計量可塑化工程に対して複数回(例えば2〜3ショット)成形を行うと共に、必要に応じて射出速度切換位置や保圧切換位置、またはサックバック量等の補正を行うことにより、従来インラインスクリュ式射出成形機では十分に成形できなかったような非常に小さい成形品についても、安定した精度の高い成形を行うことができる射出成形機の射出制御方法及びその射出装置を提供することを目的としている。   This invention has been made to solve the above-described conventional problems, and performs molding several times (for example, 2 to 3 shots) for one metering plasticizing process, and injects as necessary. By correcting the speed switching position, holding pressure switching position, suckback amount, etc., stable and highly accurate even for very small molded products that could not be molded sufficiently with conventional inline screw type injection molding machines It is an object of the present invention to provide an injection control method for an injection molding machine that can perform molding and an injection apparatus for the same.

この発明は上記目的を達成するために、成形品に見合った計量完了位置よりも大きい計量完了位置を設定し、通常の保圧切換位置を設定して保圧に切換える従来と同様の成形方法で成形したときの保圧切換位置よりも小さい最小保圧切換位置を新たに設けて、保圧切換位置が最小保圧切換位置よりも大きい時(計量完了位置まで計量可塑化後の次ショットは必ずこの状態になる)は、次ショット用の計量可塑化工程を実施しないでスプリングバック位置を補正計量完了位置とし、補正値α=(設定量完了位置−補正計量完了位置)を演算し、その後の射出速度切換位置および保圧切換位置を設定値から(設定値−補正値α)に自動的に設定変更して次ショットの成形を実行する。   In order to achieve the above object, the present invention uses a molding method similar to the conventional one in which a measurement completion position larger than the measurement completion position corresponding to the molded product is set, and a normal holding pressure switching position is set to switch to holding pressure. A minimum holding pressure switching position smaller than the holding pressure switching position at the time of molding is newly provided, and when the holding pressure switching position is larger than the minimum holding pressure switching position (the next shot after plasticizing to the weighing completion position is always In this state), the spring back position is set as the corrected measurement completion position without performing the measurement plasticizing process for the next shot, and the correction value α = (set amount completion position−correction measurement completion position) is calculated. The injection shot switching position and the holding pressure switching position are automatically changed from the set value to (set value−correction value α), and the next shot is formed.

そして、(補正保圧切換位置−最小保圧切換位置)を演算し、この値が正の場合は次ショットの計量はせずに、この値が負の場合はスプリングバック位置から計量完了位置まで計量可塑化工程を実行する。   Then, (corrected holding pressure switching position−minimum holding pressure switching position) is calculated. If this value is positive, the next shot is not measured, and if this value is negative, from the spring back position to the measurement completion position. Perform the meter plasticization process.

なお、計量可塑化工程を実行しない場合は、スクリュを回転しないために計算可塑化した場合に比べてドルーリングしにくいので、補正計量完了位置からのサックバック量を計量した場合の(設定サックバック量×補正係数β)とする。ここで、β<1.0である。   If the weighing plasticization process is not performed, the screw does not rotate, so drooling is difficult compared to the case of calculation plasticizing, so when the amount of suckback from the corrected weighing completion position is measured (the set suckback Amount × correction coefficient β). Here, β <1.0.

すなわち、本発明は、シリンダ内に、回転可能かつ前後進可能に配設されたスクリュを有する射出成形機の射出制御方法であって、射出中における射出圧力およびスクリュ位置を検出し、これら検出値に基づき、射出速度を切り換える前記スクリュ位置および射出工程から保圧工程へと切り換える前記スクリュ位置の各切換スクリュ位置を制御する射出成形機の射出制御方法において、設定された計量完了位置まで計量可塑化完了後、設定されたサックバック量でサックバックし、設定された保圧切換位置まで射出工程を行い、保圧切換位置到達以降に保圧工程を行って成形し、設定された保圧切換位置よりも小さいスクリュ位置に最小保圧切換位置を設けて連続成形するに際して、保圧後の圧力を抜く圧抜き工程後のスプリングバック完了位置を計測して、設定された計量完了位置を前記スプリングバック完了位置と同じ値に置き換えた補正計量完了位置とし、補正量α=(設定計量完了位置−補正計量完了位置)を演算し、設定された射出速度切換位置と設定された保圧切換位置を各々の設定値から補正量αだけ差し引いた補正射出速度切換位置と補正保圧切換位置を求め、前記設定された保圧切換位置あるいは前記補正保圧切換位置が前記最小保圧切換位置よりも大きいショットの場合は、前記設定された計量完了位置を前記補正計量完了位置として次ショットの計量可塑化工程を省略すると共に、前記補正射出速度切換位置と補正保圧切換位置を用いて継続成形し、前記補正保圧切換位置が前記最小保圧切換位置よりも小さいショットの場合は、前記スプリングバック完了位置から前記設定された計量完了位置まで計量可塑化して継続成形することを特徴とする。   That is, the present invention is an injection control method for an injection molding machine having a screw disposed in a cylinder so as to be rotatable and capable of moving back and forth, and detects an injection pressure and a screw position during injection, and detects these detected values. In the injection control method of an injection molding machine for controlling the screw position for switching the injection speed and the switching screw position of the screw position for switching from the injection process to the pressure-holding process, the plasticizing is performed up to the set measurement completion position. After completion, suck back with the set suck back amount, perform the injection process to the set holding pressure switching position, perform the holding process after reaching the holding pressure switching position, mold, and set the holding pressure switching position Spring back completion after the pressure release process to release the pressure after holding pressure when forming the minimum holding pressure switching position at a smaller screw position The measured weighing position is replaced with the corrected weighing completion position by replacing the set weighing completion position with the same value as the springback completion position, and the correction amount α = (set weighing completion position-corrected weighing completion position) is calculated and set. The corrected injection speed switching position and the corrected holding pressure switching position obtained by subtracting the set injection pressure switching position and the set holding pressure switching position from each set value by the correction amount α are obtained, and the set holding pressure switching position or the In the case of a shot in which the corrected holding pressure switching position is larger than the minimum holding pressure switching position, the measurement plasticizing step of the next shot is omitted with the set weighing completion position as the corrected weighing completion position, and the corrected injection speed When the continuous molding is performed using the switching position and the corrected holding pressure switching position, and the corrected holding pressure switching position is smaller than the minimum holding pressure switching position, the spring back completion position is determined. Characterized by continuously molding metered plasticized until the set metering completion position from.

ここで、サックバック量を、計量可塑化工程を実施した後は設定されたサックバック量でサックバックし、計量可塑化工程を省略した後は設定されたサックバック量に1.0よりも小さい補正係数βを乗じたサックバック量でサックバックすることを特徴とする。   Here, the suck back amount is sucked back by the set suck back amount after the measurement plasticizing step is performed, and after the measurement plasticizing step is omitted, the set suck back amount is smaller than 1.0. It is characterized by sucking back with a sucking back amount multiplied by a correction coefficient β.

また、本発明は、シリンダ(1)内に、回転可能かつ前後進可能に配設されたスクリュ(3)の、射出中におけるスクリュ位置を検出する位置検出部(9)と、射出中の射出圧力を検出する圧力検出部(7)と、前記位置検出部(9)からの信号に基づき前記スクリュ(3)の位置および速度をフィードバック制御する位置速度FB制御器(17)と、前記スクリュ(3)の射出速度を切り換える際の前記スクリュ位置である射出速度切換位置と、保圧工程に切り換える際の前記スクリュ位置である保圧切換位置とを設定し、前記射出速度切換位置および前記保圧切換位置を前記位置速度FB制御器(17)へと出力するスクリュ位置速度設定部(13)とを有する射出成形機の射出制御装置において、最小保圧切換位置を設定する最小保圧切換位置設定部(14)とサックバック量補正係数βを設定するβ値設定部(14)を設け、保圧切換位置と最小保圧切換位置とを比較して次ショットの計量可塑化工程を実施するか否かを判断する回転要否判定部(19)と、計量可塑化工程を省略する場合の補正サックバック量と前記射出速度切換位置と保圧切換位置の補正量を演算して前記スクリュ位置速度設定部(13)に出力するスクリュ位置補正量演算器(18)を有することを特徴とする。   The present invention also provides a position detection unit (9) for detecting a screw position during injection of a screw (3) disposed in the cylinder (1) so as to be rotatable and capable of moving forward and backward, and injection during injection. A pressure detector (7) for detecting pressure, a position / speed FB controller (17) for feedback control of the position and speed of the screw (3) based on a signal from the position detector (9), and the screw ( The injection speed switching position that is the screw position when switching the injection speed of 3) and the holding pressure switching position that is the screw position when switching to the pressure holding process are set, and the injection speed switching position and the pressure holding pressure are set. In an injection control apparatus of an injection molding machine having a screw position / speed setting unit (13) for outputting a switching position to the position / speed FB controller (17), a minimum pressure holding for setting a minimum pressure holding switching position. A replacement position setting section (14) and a β value setting section (14) for setting the suck back amount correction coefficient β are provided, and the measurement plasticizing process for the next shot is performed by comparing the holding pressure switching position with the minimum holding pressure switching position. A rotation necessity determination unit (19) for determining whether or not to carry out, a correction suck back amount when the measurement plasticizing step is omitted, a correction amount of the injection speed switching position, and a holding pressure switching position; It has a screw position correction amount calculator (18) which outputs to a screw position speed setting part (13), It is characterized by the above-mentioned.

以上のようにこの発明によれば、選択されたスクリュサイズに不向きなような非常に小さい成形品であっても2〜3ショットに1回の計量可塑化を行うことで、スプリングバック位置が計量完了位置より大きくなることはなく、また1回の計量値を大きくできるので安定した計量可塑化が行えることとなり、計量可塑化後の溶融樹脂密度および計量可塑化しないショットの溶融樹脂密度も安定するので、連続して安定した成形品が得られる効果がある。もって、インラインスクリュ式射出成形機では成形できなかったような非常に小さい成形品も成形可能ならしめる効果が得られる。   As described above, according to the present invention, even with a very small molded product that is not suitable for the selected screw size, the spring back position is measured by performing plasticization once every two to three shots. It will not be larger than the completion position, and the measurement value for one time can be increased, so stable metering plasticization can be performed, and the melted resin density after metering plasticization and the melt resin density of shots that are not metering plasticized are also stable. Therefore, there is an effect that a continuously stable molded product can be obtained. Therefore, the effect of making it possible to mold even a very small molded product that could not be molded by an inline screw type injection molding machine can be obtained.

以下、本発明の実施の形態について図面を参照しつつ説明する。
図1は、射出装置のスクリュ駆動部の構成図である。
加熱シリンダ1内には、先端に逆流防止リング機構2が螺合されたスクリュ3が回転可能かつ前後動可能に設けられている。
スクリュ3の後部には、スクリュ3を回転する回転サーボモータ4が回転計5と共に連結され、また、スクリュ3をロードセル7、ボールネジ6を介して前後動する射出サーボモータ8にエンコーダ9と共に連結される。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of a screw driving unit of an injection apparatus.
In the heating cylinder 1, a screw 3 having a backflow prevention ring mechanism 2 screwed to the tip is provided to be rotatable and movable back and forth.
A rotary servo motor 4 that rotates the screw 3 is connected to a rear portion of the screw 3 together with a tachometer 5, and a screw 3 is connected to an injection servo motor 8 that moves back and forth via a load cell 7 and a ball screw 6 together with an encoder 9. The

図2は本発明に用いられる射出制御装置のブロック図である。
コントローラ10は、回転サーボモータ4の回転数を設定するスクリュ回転数設定部11と、射出圧力と保圧圧力を設定する圧力設定部12と、スクリュ3の位置および速度を設定するスクリュ位置・速度設定部13と、最小保圧切換位置及びβ値を設定する最小保圧切換位置及びβ値設定部14を有する。
FIG. 2 is a block diagram of an injection control device used in the present invention.
The controller 10 includes a screw rotation speed setting unit 11 that sets the rotation speed of the rotary servo motor 4, a pressure setting unit 12 that sets the injection pressure and the holding pressure, and a screw position / speed that sets the position and speed of the screw 3. It has a setting section 13 and a minimum holding pressure switching position and β value setting section 14 for setting a minimum holding pressure switching position and a β value.

スクリュ回転数設定部11は、回転FB制御器15へと回転サーボモータ4の設定回転数を出力する。   The screw rotation speed setting unit 11 outputs the set rotation speed of the rotary servo motor 4 to the rotation FB controller 15.

回転FB制御器15は、スクリュ回転数設定部11から入力された設定回転数と回転計5から入力された回転サーボモータ4の回転数とが入力され、その偏差信号をサーボアンプ21へと出力して回転サーボモータ4のフィードバック制御を行う。   The rotation FB controller 15 receives the set rotation speed input from the screw rotation speed setting unit 11 and the rotation speed of the rotary servo motor 4 input from the tachometer 5, and outputs the deviation signal to the servo amplifier 21. Then, feedback control of the rotary servo motor 4 is performed.

圧力設定部12は、圧力FB制御器16へと射出サーボモータ8による設定射出圧力と保圧圧力を出力する。圧力FB制御器16には、圧力設定部12から入力された設定射出圧力と保圧圧力およびロードセル7から入力された圧力とが入力され、射出工程中は射出圧力を計測し、保圧工程中は設定値と計測値の偏差信号を切換スイッチ20を介してサーボアンプ22へと出力して射出サーボモータ8のフィードバック制御を行う。   The pressure setting unit 12 outputs the set injection pressure and holding pressure by the injection servomotor 8 to the pressure FB controller 16. The pressure FB controller 16 receives the set injection pressure and the holding pressure input from the pressure setting unit 12 and the pressure input from the load cell 7, measures the injection pressure during the injection process, and performs the pressure holding process. Outputs a deviation signal between the set value and the measured value to the servo amplifier 22 via the changeover switch 20 to perform feedback control of the injection servo motor 8.

スクリュ位置・速度設定部13は、計量完了位置Bと、サックバック量と、スクリュ3の射出速度を切り換える際の位置である射出速度切換位置と、射出工程から保圧工程へと切り換える保圧切換位置Cを設定する。   The screw position / speed setting unit 13 is configured to switch the measurement completion position B, the suck back amount, the injection speed switching position that is a position for switching the injection speed of the screw 3, and the pressure holding switching for switching from the injection process to the pressure holding process. Set position C.

位置速度FB制御器17はスクリュ位置・速度設定部13からの射出速度切換位置および保圧切換位置Cと、エンコーダ9からのスクリュ位置とが入力され、その偏差信号を切換スイッチ20を介してサーボアンプ22へと出力してフィードバック制御を行う。   The position / speed FB controller 17 receives the injection speed switching position and the holding pressure switching position C from the screw position / speed setting unit 13 and the screw position from the encoder 9, and servos the deviation signal via the switch 20. Output to the amplifier 22 to perform feedback control.

なお、切換スイッチ20は、射出工程では自動的に図2に示す位置すなわち位置速度FB制御器17からの信号がサーボアンプ22へと出力される状態となっており、スクリュ位置およびスクリュ速度による制御がなされることになる。スクリュ3が保圧切換位置Cに達すると切換スイッチ20は切り換わり、圧力FB制御器16からの信号がサーボアンプ22へと出力される。これにより保圧工程中は圧力制御となる。   In the injection process, the changeover switch 20 is in a state in which a signal shown in FIG. 2, that is, a signal from the position speed FB controller 17 is automatically output to the servo amplifier 22, and is controlled by the screw position and the screw speed. Will be made. When the screw 3 reaches the holding pressure switching position C, the changeover switch 20 is switched, and a signal from the pressure FB controller 16 is output to the servo amplifier 22. This provides pressure control during the pressure holding process.

最小保圧切換位置とβ値設定部14は、保圧切換位置Cよりも小さい値である最小保圧切換位置Fおよび計量可塑化工程を実施しない場合のサックバック量の補正係数β値を設定する。   The minimum holding pressure switching position and β value setting unit 14 sets the minimum holding pressure switching position F that is smaller than the holding pressure switching position C and the correction coefficient β value of the suck back amount when the measurement plasticizing process is not performed. To do.

回転要否判定器19には、最小保圧切換位置とβ値設定部からの最小保圧切換位置Fとエンコーダ9で計測される保圧切換位置CあるいはC´が入力され、次ショット用の計量可塑化工程を実行するか否かを判定し、否の場合にはスクリュ位置補正量演算器18に指令を出して補正値αを演算し、スクリュ位置・速度設定部13に設定された、計量完了位置Bとサックバック量と射出速度切換位置と保圧切換位置Cを補正する。   The rotation necessity determination unit 19 receives the minimum holding pressure switching position, the minimum holding pressure switching position F from the β value setting unit, and the holding pressure switching position C or C ′ measured by the encoder 9 for the next shot. It is determined whether or not the measurement plasticizing step is to be executed. If not, a command is issued to the screw position correction amount calculator 18 to calculate the correction value α, and the screw position / speed setting unit 13 is set. The measurement completion position B, the suck back amount, the injection speed switching position, and the holding pressure switching position C are corrected.

次に、射出制御装置の動作を図3に示すフローチャートおよび図4(a)および図4(b)に示すスクリュ位置に関する設定値の一例を参照して説明する。   Next, the operation of the injection control device will be described with reference to the flowchart shown in FIG. 3 and examples of set values relating to the screw position shown in FIGS. 4 (a) and 4 (b).

成形準備(S1)において、従来の成形方法で決める計量完了位置よりも大き目の計量完了位置Bおよびサックバック量を設定して計量可塑化し、従来通りの成形手順で設定した保圧切換位置Cまで速度フィードバック制御で射出し(S2〜S5)、保圧切換位置C以降は圧力フィードバック制御で保圧を加えて成形する。なお、最小保圧切換位置とβ値設定部14により、その時の保圧切換位置Cよりも小さいスクリュ位置に最小保圧切換位置Fが設定されている。   In the molding preparation (S1), the measurement completion position B and the suck back amount larger than the measurement completion position determined by the conventional molding method are set and plasticized, and the holding pressure switching position C set by the conventional molding procedure is reached. Injection is performed by speed feedback control (S2 to S5), and after the holding pressure switching position C, holding pressure is applied by pressure feedback control to form. Note that the minimum holding pressure switching position F is set to a screw position smaller than the holding pressure switching position C at that time by the minimum holding pressure switching position and the β value setting unit 14.

保圧切換位置CあるいはC´が最小保圧切換位置Fよりも大きい場合(S8,YES)には(計量完了位置Bまで計量可塑化された次ショットは必ずこのようになる、また、補正後もC´>Fとなるショットがあり得る)、保圧後のスプリングバック位置EあるいはE´まで圧抜きした後の計量可塑化工程を省略し、次ショットの計量完了位置Bを、スプリングバック位置EあるいはE´と同一値に置き換えた補正計量完了位置B´とすると共に、補正値α=(計量完了位置B−スプリングバック位置EあるいはE´)と設定サックバック量に補正係数βを乗じたサックバック量を演算して(S9)、補正サックバック完了位置A´までサックバックし(S10)、設定射出速度切換位置(図示せず)と保圧切換位置Cから補正値αだけ差し引いた補正射出速度切換位置(図示せず)および補正保圧切換位置C´に置き換えて(S11、S12)成形する(S13)。   When the holding pressure switching position C or C ′ is larger than the minimum holding pressure switching position F (S8, YES), the next shot that has been plasticized to the measurement completion position B is always like this. There is also a shot where C ′> F), and the measurement plasticizing step after the pressure is released to the spring back position E or E ′ after holding is omitted, and the measurement completion position B of the next shot is set as the spring back position. The correction weighing completion position B ′ is replaced with the same value as E or E ′, and the correction value α = (measurement completion position B−spring back position E or E ′) and the set suck back amount are multiplied by the correction coefficient β. The suck back amount is calculated (S9), sucked back to the corrected suck back completion position A ′ (S10), and the correction value α is subtracted from the set injection speed switching position (not shown) and the holding pressure switching position C. Replacing the positive injection speed switching position (not shown) and corrected hold pressure switching position C'(S11, S12) forming (S13).

補正保圧切換位置C´が最小保圧切換位置Fより小さい値となった時には(S8,NO)、スプリングバック位置E´から計量完了位置Bまで計量可塑化しサックバック完了位置Aまでサックバックして成形を継続する。   When the corrected holding pressure switching position C ′ becomes smaller than the minimum holding pressure switching position F (S8, NO), the plasticity is measured from the spring back position E ′ to the measurement completion position B and sucked back to the suck back completion position A. Continue molding.

なお、補正サックバック量は設定サックバック量×補正係数βとし、βは1.0以下の値であって計量可塑化工程の有無によって成形品質が変化しないような最適値を成形しながら求めることとなるが、一般的には0.2〜0.6程度となる。   The corrected suckback amount is set as the set suckback amount × correction coefficient β, and β is a value equal to or less than 1.0 and is obtained while forming an optimum value that does not change the molding quality depending on the presence or absence of the metering plasticization process. However, generally it is about 0.2 to 0.6.

以上のように本発明によれば、1回目のショットとその後のショットにおいて、射速切換位置、保圧切換位置、サックバック量を自動補正しながら成形を行うことにより、製造可能な最小スクリュ径φ14〜φ16をもってしても計量値が小さすぎるような成形品でも充分な計量値で成形できるので、安定した連続成形が可能である。   As described above, according to the present invention, in the first shot and the subsequent shots, the minimum screw diameter that can be manufactured by performing the molding while automatically correcting the shooting speed switching position, the holding pressure switching position, and the suck back amount is achieved. Even a molded product having a measured value that is too small even with φ14 to φ16 can be molded with a sufficient measured value, so that stable continuous molding is possible.

また、最小径よりも大きいスクリュ径においても、そのスクリュ径では計量値が小さくて成形が安定しないような成形品でも本発明を適用することで、小径スクリュに交換しなくても成形できると言う効果が得られる。   In addition, even if the screw diameter is larger than the minimum diameter, it can be formed without replacing the screw with a small diameter by applying the present invention even to a molded product whose measured value is small and molding is not stable at that screw diameter. An effect is obtained.

この発明の実施の形態における射出装置のスクリュ駆動部の構成図である。It is a block diagram of the screw drive part of the injection device in embodiment of this invention. この発明の実施の形態における射出制御装置の構成を示すブロック図である。It is a block diagram which shows the structure of the injection control apparatus in embodiment of this invention. この発明の実施の形態における動作を概略的に示すフローチャートである。It is a flowchart which shows roughly the operation | movement in embodiment of this invention. (a)は、この発明の実施の形態におけるスクリュ位置に関する設定値の一例を示す概念図である。 (b)は、この発明の実施の形態において計量を実施しない場合における各設定値の補正後のスクリュ位置に関する設定値の一例を示す概念図である。 (c)は、従来のスクリュ位置に関する設定値の一例を本発明に対比して示す概念図である。(A) is a conceptual diagram which shows an example of the setting value regarding the screw position in embodiment of this invention. (B) is a conceptual diagram which shows an example of the setting value regarding the screw position after correction | amendment of each setting value when not measuring in embodiment of this invention. (C) is a conceptual diagram which shows an example of the setting value regarding the conventional screw position in contrast with this invention.

符号の説明Explanation of symbols

1 加熱シリンダ、3 スクリュ、4 回転サーボモータ、5 回転計、6 ボールネジ、7 ロードセル、8 射出サーボモータ、9 エンコーダ、10 コントローラ、11 スクリュ回転数設定部、12 圧力設定部、13 スクリュ位置・速度設定部、14 最小保圧切換位置とβ値設定部、15 回転FB制御器、16 圧力FB制御器、17 位置速度FB制御器、18 スクリュ位置補正量演算器、19 回転要否判定器、20 切換スイッチ、21,22 サーボアンプ。   1 Heating cylinder, 3 screw, 4 rotation servo motor, 5 tachometer, 6 ball screw, 7 load cell, 8 injection servo motor, 9 encoder, 10 controller, 11 screw rotation speed setting section, 12 pressure setting section, 13 screw position / speed Setting unit, 14 minimum holding pressure switching position and β value setting unit, 15 rotation FB controller, 16 pressure FB controller, 17 position speed FB controller, 18 screw position correction amount calculator, 19 rotation necessity determination unit, 20 Changeover switch, 21, 22 Servo amplifier.

Claims (3)

シリンダ内に、回転可能かつ前後進可能に配設されたスクリュを有する射出成形機の射出制御方法であって、射出中における射出圧力およびスクリュ位置を検出し、これら検出値に基づき、射出速度を切り換える前記スクリュ位置および射出工程から保圧工程へと切り換える前記スクリュ位置の各切換スクリュ位置を制御する射出成形機の射出制御方法において、
設定された計量完了位置まで計量可塑化完了後、設定されたサックバック量でサックバックし、設定された保圧切換位置まで射出工程を行い、保圧切換位置到達以降に保圧工程を行って成形し、設定された保圧切換位置よりも小さいスクリュ位置に最小保圧切換位置を設けて連続成形するに際して、
保圧後の圧力を抜く圧抜き工程後のスプリングバック完了位置を計測して、設定された計量完了位置を前記スプリングバック完了位置と同じ値に置き換えた補正計量完了位置とし、
補正量α=(設定計量完了位置−補正計量完了位置)を演算し、設定された射出速度切換位置と設定された保圧切換位置を各々の設定値から補正量αだけ差し引いた補正射出速度切換位置と補正保圧切換位置を求め、
前記設定された保圧切換位置あるいは前記補正保圧切換位置が前記最小保圧切換位置よりも大きいショットの場合は、前記設定された計量完了位置を前記補正計量完了位置として次ショットの計量可塑化工程を省略すると共に、前記補正射出速度切換位置と補正保圧切換位置を用いて継続成形し、
前記補正保圧切換位置が前記最小保圧切換位置よりも小さいショットの場合は、前記スプリングバック完了位置から前記設定された計量完了位置まで計量可塑化して継続成形することを特徴とする射出成形機の射出制御方法。
An injection control method for an injection molding machine having a screw arranged in a cylinder so as to be rotatable and capable of moving forward and backward, detecting an injection pressure and a screw position during injection, and determining an injection speed based on these detected values. In the injection control method of the injection molding machine for controlling each screw position to be switched from the screw position to be switched and the screw position to be switched from the injection process to the pressure holding process,
After completion of weighing plasticization to the set weighing completion position, suck back with the set suck back amount, perform the injection process to the set holding pressure switching position, and perform the holding pressure process after reaching the holding pressure switching position When forming and continuously forming a minimum holding pressure switching position at a screw position smaller than the set holding pressure switching position,
Measure the spring back completion position after the pressure release process to release the pressure after holding pressure, and set the measurement completion position as the corrected measurement completion position replaced with the same value as the spring back completion position,
Correction amount α = (Setting weighing completion position-Correction weighing completion position) is calculated, and the corrected injection speed switching is performed by subtracting the set injection speed switching position and the set holding pressure switching position from each setting value by the correction amount α. Find the position and corrected holding pressure switching position,
If the set holding pressure switching position or the corrected holding pressure switching position is larger than the minimum holding pressure switching position, the next shot is subjected to weighing plasticization with the set weighing completion position as the corrected weighing completion position. While omitting the process, continuous molding using the corrected injection speed switching position and the correction holding pressure switching position,
An injection molding machine characterized in that when the corrected holding pressure switching position is a shot smaller than the minimum holding pressure switching position, the plasticization is continuously plasticized from the spring back completion position to the set measurement completion position, and is continuously molded. Injection control method.
サックバック量を、計量可塑化工程を実施した後は設定されたサックバック量でサックバックし、計量可塑化工程を省略した後は設定されたサックバック量に1.0よりも小さい補正係数βを乗じたサックバック量でサックバックすることを特徴とする請求項1に記載の射出成形機の射出制御方法。   The suck back amount is sucked back by the set suck back amount after the measurement plasticizing step, and after the measurement plasticizing step is omitted, the correction factor β smaller than 1.0 is set to the set suck back amount. The injection control method for an injection molding machine according to claim 1, wherein suck back is performed with a suck back amount multiplied by. シリンダ(1)内に、回転可能かつ前後進可能に配設されたスクリュ(3)の、射出中におけるスクリュ位置を検出する位置検出部(9)と、射出中の射出圧力を検出する圧力検出部(7)と、前記位置検出部(9)からの信号に基づき前記スクリュ(3)の位置および速度をフィードバック制御する位置速度FB制御器(17)と、前記スクリュ(3)の射出速度を切り換える際の前記スクリュ位置である射出速度切換位置と、保圧工程に切り換える際の前記スクリュ位置である保圧切換位置とを設定し、前記射出速度切換位置および前記保圧切換位置を前記位置速度FB制御器(17)へと出力するスクリュ位置速度設定部(13)とを有する射出成形機の射出制御装置において、
最小保圧切換位置を設定する最小保圧切換位置設定部(14)とサックバック量補正係数βを設定するβ値設定部(14)を設け、保圧切換位置と最小保圧切換位置とを比較して次ショットの計量可塑化工程を実施するか否かを判断する回転要否判定部(19)と、計量可塑化工程を省略する場合の補正サックバック量と前記射出速度切換位置と保圧切換位置の補正量を演算して前記スクリュ位置速度設定部(13)に出力するスクリュ位置補正量演算器(18)を有することを特徴とする射出成形機の射出装置。
A position detector (9) for detecting a screw position during injection of a screw (3) disposed in the cylinder (1) so as to be rotatable and capable of moving back and forth, and pressure detection for detecting an injection pressure during injection Part (7), a position speed FB controller (17) for feedback control of the position and speed of the screw (3) based on a signal from the position detection part (9), and an injection speed of the screw (3). An injection speed switching position that is the screw position when switching and a pressure holding switching position that is the screw position when switching to the pressure holding process are set, and the injection speed switching position and the pressure holding switching position are set to the position speed. In an injection control device of an injection molding machine having a screw position speed setting unit (13) for outputting to an FB controller (17),
A minimum holding pressure switching position setting unit (14) for setting the minimum holding pressure switching position and a β value setting unit (14) for setting the suck back amount correction coefficient β are provided, and the holding pressure switching position and the minimum holding pressure switching position are provided. A rotation necessity determination unit (19) that determines whether or not to perform the measurement plasticization process for the next shot by comparison, and the correction suck back amount and the injection speed switching position when the measurement plasticization process is omitted are maintained. An injection apparatus for an injection molding machine, comprising a screw position correction amount calculator (18) that calculates a correction amount of a pressure switching position and outputs the calculated value to the screw position speed setting unit (13).
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