JP4104042B2 - Clamping control method of injection molding machine - Google Patents

Clamping control method of injection molding machine Download PDF

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Publication number
JP4104042B2
JP4104042B2 JP2001097905A JP2001097905A JP4104042B2 JP 4104042 B2 JP4104042 B2 JP 4104042B2 JP 2001097905 A JP2001097905 A JP 2001097905A JP 2001097905 A JP2001097905 A JP 2001097905A JP 4104042 B2 JP4104042 B2 JP 4104042B2
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Japan
Prior art keywords
mold clamping
control
clamping force
mold
detection device
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JP2001097905A
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Japanese (ja)
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JP2001341180A (en
JP2001341180A5 (en
Inventor
博 油谷
晋二 角陸
明 矢部
忠雄 村田
龍馬 村瀬
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Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2001097905A priority Critical patent/JP4104042B2/en
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Publication of JP2001341180A5 publication Critical patent/JP2001341180A5/ja
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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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/7653—Measuring, controlling or regulating mould clamping forces
    • 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
    • B29C45/64—Mould opening, closing or clamping devices
    • B29C45/66—Mould opening, closing or clamping devices mechanical
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76006—Pressure
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76013—Force
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76224—Closure or clamping unit
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76391—Mould clamping, compression of the cavity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76494—Controlled parameter
    • B29C2945/76595—Velocity
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76702—Closure or clamping device
    • B29C2945/76705—Closure or clamping device mould platen
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76702—Closure or clamping device
    • B29C2945/76709—Closure or clamping device clamping or closing drive means
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76655—Location of control
    • B29C2945/76732—Mould
    • B29C2945/76735—Mould cavity
    • B29C2945/76739—Mould cavity cavity walls
    • B29C2945/76742—Mould cavity cavity walls movable
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76869—Mould clamping, compression of the cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • B29L2017/005—CD''s, DVD''s

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、光ディスクの樹脂成形などに用いる型締力検出装置を有した射出成形機の型締め制御方法に関するものである。
【０００２】
【従来の技術】
従来の射出成形機における型締め制御としては、図４に示すように、設定された型締力としての目標値Ｆと型締力検出装置からの実測値Ｆ’の差を比例・積分して速度指令値Ｖを出力し、型締力を前記目標値Ｆに達するように制御する型締力フィードバック速度制御を採用していた。なお、図４においてＩ／Ｓは積分要素、Ｐは比例要素である。
【０００３】
【発明が解決しようとする課題】
しかしながら、ハイサイクル成形や、樹脂の硬化が早いものに対しては、射出圧縮工程時、高速の型締め制御が要求されるが、従来の型締力フィードバック制御では、高速化に対応できなかった。
【０００４】
また従来の型締力フィードバック速度制御では、型締力検出装置から型締力を検出する必要があるため、型閉じ後における型締め制御にしか適用できず、型開き状態で射出を行う型開き成形における型締め制御に適用することができなかった。
【０００５】
なお、高速化、型開き成形適用化のために型締め位置に基づく型締位置制御を行うことが考えられるが、この場合には成形精度が低下し、特に光ディスク成形等における転写精度が低下するという問題がある。
【０００６】
本発明は、成形精度、転写性の向上を図ることができると共に高速化を図ることができる射出成形機の型締め制御方法を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記の目的を達成するために、本発明の射出成形機の型締め制御方法では、下プラテンを駆動する型締め機構と型締力検出装置と型締め位置検出装置とを有した射出成形機において、上金型を具備した上プラテンを固定し、下金型を具備した下プラテンを可動状態として、型締め制御を行う時に、型締力検出装置により検出された型締力に基づきフィードバック制御する型締力制御と、型締め位置検出装置により検出された型締め位置に基づき制御する型締位置制御とを複合して、下プラテンの移動を制御する方法であって、当初の射出圧縮開始からの初期期間は型締位置制御を行い、下プラテンが所定位置に達した後型締力制御を行い、前記型締位置制御中に型締力検出装置から検出された検出値が予め設定した型締力に達すると、下プラテンが所定位置に達する前であっても、この型締位置制御を型締力制御に切り換えるようにしたことを特徴としている。
【０００８】
このような方法では、射出圧縮制御において、型締力制御に併せて型締位置制御を複合し、このそれぞれの長所を生かして制御することができる。すなわち射出圧縮の開始からの初期期間には、時間のかかる型締力制御に換えて型締位置制御により高速にて型締め制御を行うことができ、その後時間をかけた低速制御の型締力制御により、成形精度、転写性の向上を図ることができる型締め成形を行うことができる。
【００１０】
本発明の型締め制御方法において、型締力制御中に、型締力検出装置から検出された検出値と予め設定した設定値の型締力の差のレベルにより、一定速度制御と力フィードバック速度制御との一方から他方に切換えるように構成することができる。前記一定速度制御における速度指令値を自由に変更できるようにすると好適である。
【００１１】
本発明のそれ以上の目的及び特徴は、以下の詳細な説明及び図面によって明らかになる。本発明の各特徴は、可能な限りにおいて、それ単独で、あるいは種々な組み合わせ方法を複合して用いることができる。
【００１２】
【発明の実施の形態】
以下、本発明における実施の形態について図１〜図３を参照しながら説明し、本発明の理解に供する。
【００１３】
ただし、本発明は、以下の実施の形態に限定されず、特に限定的な記載がない限りは、本発明の範囲をそれらのみに限定する趣旨のものではなく、単なる説明例にすぎない。
【００１４】
この種の射出成形機は、図１に示すように駆動系としてサーボモータ１からベルト４を介して伝達された回転運動を横往復運動に変えるクランク機構５と、この横往復運動を上下運動に変えるトグル機構６とからなる型開閉機構７と、タイバー２に設けた型締力検出装置としての歪センサー３からのアナログ信号を検出すると共にサーボモータ１のエンコーダ（型締め位置検出装置）からの速度・位置信号を検出してサーボモータ１の速度・トルクを制御する制御装置８と、タイバー２に沿ってスライド自在な下プラテン９に取り付けられた下金型１０ａとタイバー２に上プラテン１１を介して取り付けられた上金型１０ｂとからなる金型１０とを備え、上金型１０ｂの上方に配したノズルから成形材料としての溶融樹脂を金型１０内のキャビティに射出するように構成されている。
【００１５】
上プラテン１１はタイバー２の上端に固定され、下プラテン９は型開閉機構７によって駆動される。制御装置８は、歪センサー３から締結力信号を入力すると共にサーボモータ１からの速度・位置信号を入力し、サーボモータ１に速度・トルク指令を出力する。
【００１６】
制御装置８による型締め制御は、図２に示すように、射出圧縮開始から射出圧縮終了に至る期間において、型締位置制御Ａ〜型締力制御Ｂ〜型締位置制御Ａを順次行うようにしてある。
【００１７】
当初の射出圧縮開始からの初期期間には、型締位置制御Ａにて、サーボモータ１のエンコーダからの位置信号に基づき、設定された高速度にて目標位置Ｘ１まで短時間に下プラテン９を上昇させる。
【００１８】
次に、Ｘ１位置からの中間期間には、型締力制御Ｂにて、歪センサー３からの締結力信号に基づき、実測締結力Ｆ’（図４参照）が先ず目標締結力Ｆ１になるよう下プラテン９を上昇させ、指定時間Ｔ1 までこの型締力を維持させた後、次の目標締結力Ｆ2 （Ｆ2 ＜Ｆ1 ）になるよう下プラテン９を下降させ、指定時間Ｔ2 までこの型締力を維持させ（図示の場合は維持時間が零である。）さらに目標締結力Ｆ3 （Ｆ3 ＜Ｆ2 ）になるよう下プラテン９を下降させて、指定時間Ｔ3 までこの締結力を維持させる制御を行っている。この型締力制御Ｂは、具体的には図４に示す型締力フィードバック速度制御を採用している。これにより樹脂状態の変化に対応したフィードバック速度にて時間をかけて成形品の圧縮成形を行うことができる。
【００１９】
その後の射出圧縮終了までの終期期間は、再度、型締位置制御Ａに戻り、これにより下プラテン９を、設定された高速度で目標位置Ｘ２、次いで目標位置Ｘ３まで短時間で下降させ、射出圧縮を終了する。
【００２０】
この方法では、射出圧縮制御工程の開始時には、時間のかかる型締力制御Ｂに換えて短時間で下プラテンが所定位置Ｘ1 に達する型締位置制御Ａにより型締め制御をするようにし、その後時間をかけた型締力制御Ｂにより成形精度が向上されるようにしてある。
【００２１】
本実施形態では、初期期間において型締位置制御Ａを行っているので、上金型１０ｂと下金型１０ａとの間に若干の隙間が存する状態で射出を行う型開き成形を行うことができ、図２にはその場合が示されている（射出圧縮開始時および射出圧縮終了時での型締力が０であることはこのことを示している。）。しかし本実施形態の型締め制御方法を型閉じ成形に適用することができることは勿論である。
【００２２】
なお、前記制御装置８により、高速制御することができる型締位置制御Ａと、高精度な成形を行うことができる型締力制御Ｂとを成形樹脂等に対応して任意に選択、組み合わせを行うことができるようにして、高速動作にて高精度な射出圧縮制御を行うことができる。
【００２３】
上記実施形態の型締め制御方法では、初期期間における型締位置制御Ａは、下プラテン９が目標位置Ｘ1 に達した時点で終了しているが、型締力検出装置からの検出値が予め設定した型締力に達すると、型締位置制御Ａを終了して、型締力制御Ｂに切り換えるように構成することができる。
【００２４】
これは、図２の下側のグラフに仮想線で示すように、型締位置制御Ａにより下プラテン９の高速度でＸ１までの移動中において、予め設定された型締力（Ｆ０）に達すると、この型締位置制御（Ａ）中においてもこの型締位置制御（Ａ）を終了して、型締力制御（Ｂ）に切り換えるようにしたものであり、型締め制御される成形品の成形樹脂状態の変化に確実に対応することができるようになる。
【００２５】
上記実施形態の型締力制御Ｂは、そのすべてを図４に示すような型締力フィードバック速度制御で行っているが、この型締力制御Ｂを、一定速度制御と力フィードバック速度制御（図４参照）とを組み合わせたもので行うことができる。具体的には図３に示すように、型締力検出装置からの検出値Ｆ’と設定した型締力Ｆの差が大で、出力としての速度指令が上限Ｖ0 、下限−Ｖ0 を越えるときは、これらに制限を加えて型締力制御中の速度を一定速度Ｖ0 、−Ｖ0 とする一定速度制御を行い、前記差が小のときは力フィードバック速度制御を行うようにして、図４に示す場合と同様の速度指令Ｖが出力されるようにすることができる。
【００２６】
また前記上限、下限の速度指令Ｖ0 、−Ｖ0 を任意に定めるように構成することもできる。
【００２７】
【発明の効果】
本発明によれば、高精度かつ高速の射出圧縮成形を行うことができる。
【図面の簡単な説明】
【図１】射出成形機の型締め機構の概略図である。
【図２】本発明の実施形態における型締め制御時の型締力と型締位置のタイミング図である。
【図３】本発明の実施形態における型締力制御のブロック図である。
【図４】型締力の制御ブロック図である。
【符号の説明】
１ サーボモータ
２ タイバー
３ 歪センサー
４ ベルト
５ クランク機構
６ ドグル機構
７ 型開閉機構
８ 制御装置
９ 下プラテン
１０ 金型
１０ａ 下金型
１０ｂ 上金型
１１ 上プラテン
Ａ 型締位置制御
Ｂ 型締力制御[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold clamping control method of an injection molding machine having a mold clamping force detecting device used for resin molding of an optical disk.
[0002]
[Prior art]
As shown in FIG. 4, the mold clamping control in the conventional injection molding machine is performed by proportionally / integrating the difference between the set target value F as the mold clamping force and the measured value F ′ from the mold clamping force detection device. The mold clamping force feedback speed control for outputting the speed command value V and controlling the mold clamping force to reach the target value F has been adopted. In FIG. 4 , I / S is an integral element, and P is a proportional element.
[0003]
[Problems to be solved by the invention]
However, for high-cycle molding and those with fast resin curing, high-speed mold clamping control is required during the injection compression process, but conventional mold-clamping force feedback control could not cope with high speed. .
[0004]
In addition, the conventional mold clamping force feedback speed control needs to detect the mold clamping force from the mold clamping force detection device, so it can be applied only to mold clamping control after mold closing, and mold opening that performs injection in the mold open state. It could not be applied to mold clamping control in molding.
[0005]
In addition, it is conceivable to perform mold clamping position control based on the mold clamping position for speeding up and application of mold opening molding. There is a problem.
[0006]
It is an object of the present invention to provide a mold clamping control method for an injection molding machine that can improve molding accuracy and transferability and can increase the speed.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, in a mold clamping control method of an injection molding machine according to the present invention, an injection molding machine having a mold clamping mechanism, a mold clamping force detection device, and a mold clamping position detection device for driving a lower platen. When the upper platen provided with the upper mold is fixed and the lower platen provided with the lower mold is moved and the mold clamping control is performed, feedback control is performed based on the mold clamping force detected by the mold clamping force detecting device. A method of controlling the movement of the lower platen by combining mold clamping force control and mold clamping position control that is controlled based on the mold clamping position detected by the mold clamping position detection device. the initial period perform mold clamping position control, have rows mold clamping force control after the lower platen has reached a predetermined position, the type detection value detected from the mold clamping force detection device during clamping position control is preset When the clamping force is reached, the lower plastic Emission is characterized in that as even before reaching the predetermined position, switching the clamping position control in the mold clamping force control.
[0008]
In such a method, in the injection compression control, the mold clamping position control can be combined with the mold clamping force control, and the respective advantages can be used for the control. In other words, in the initial period from the start of injection compression, it is possible to perform mold clamping control at high speed by mold clamping position control instead of time-consuming mold clamping force control, and then slow mold clamping force over time. By the control, it is possible to perform mold clamping which can improve the molding accuracy and transferability.
[0010]
In the mold clamping control method of the present invention , during mold clamping force control, constant speed control and force feedback speed are determined according to the level of the difference between the detected value detected from the mold clamping force detecting device and the preset clamping force of the set value. It can be configured to switch from one to the other with control. It is preferable that the speed command value in the constant speed control can be freely changed.
[0011]
Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used singly or in combination with various combinations as far as possible.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS . 1 to 3 for understanding of the present invention.
[0013]
However, the present invention is not limited to the following embodiments, and is not intended to limit the scope of the present invention only to these examples, but is merely an illustrative example, unless otherwise limited.
[0014]
As shown in FIG. 1, this type of injection molding machine includes a crank mechanism 5 that changes the rotational motion transmitted from the servo motor 1 through the belt 4 as a drive system to a lateral reciprocating motion, and the lateral reciprocating motion to a vertical motion. A mold opening / closing mechanism 7 comprising a toggle mechanism 6 to be changed, and an analog signal from a strain sensor 3 as a mold clamping force detection device provided on the tie bar 2 are detected and from an encoder (mold clamping position detection device) of the servo motor 1. A control device 8 that detects the speed / position signal to control the speed / torque of the servo motor 1, and a lower mold 10 a attached to the lower platen 9 slidable along the tie bar 2 and the upper platen 11 on the tie bar 2. A mold 10 composed of an upper mold 10b attached to the upper mold 10b, and a molten resin as a molding material from a nozzle disposed above the upper mold 10b. And it is configured to eject the tee.
[0015]
The upper platen 11 is fixed to the upper end of the tie bar 2, and the lower platen 9 is driven by the mold opening / closing mechanism 7. The control device 8 inputs a fastening force signal from the strain sensor 3 and inputs a speed / position signal from the servo motor 1, and outputs a speed / torque command to the servo motor 1.
[0016]
In the mold clamping control by the control device 8, as shown in FIG. 2, the mold clamping position control A to the mold clamping force control B to the mold clamping position control A are sequentially performed in the period from the start of injection compression to the end of injection compression. It is.
[0017]
In the initial period from the start of the initial injection compression, the lower platen 9 is quickly moved to the target position X1 at a set high speed based on the position signal from the encoder of the servo motor 1 in the mold clamping position control A. Raise.
[0018]
Next, in the intermediate period from the X1 position, in the mold clamping force control B, based on the fastening force signal from the strain sensor 3, the measured fastening force F ′ (see FIG. 4) first becomes the target fastening force F1. raising the lower platen 9, after maintaining this clamping force until a specified time T 1, lowering the lower platen 9 to be the next target engagement force F 2 (F 2 <F 1 ), the specified time T 2 The mold clamping force is maintained until (the maintenance time is zero in the illustrated case), and the lower platen 9 is further lowered so as to achieve the target fastening force F 3 (F 3 <F 2 ) until the designated time T 3 Control is performed to maintain this fastening force. Specifically, the mold clamping force control B employs mold clamping force feedback speed control shown in FIG. Thereby, compression molding of a molded article can be performed over time at the feedback speed corresponding to the change of the resin state.
[0019]
Thereafter, the final period until the end of the injection compression is returned to the mold clamping position control A, whereby the lower platen 9 is lowered to the target position X2 and then to the target position X3 in a short time at the set high speed, and the injection is performed. End compression.
[0020]
In this method, at the start of the injection compression control process, the mold clamping control is performed by the mold clamping position control A in which the lower platen reaches the predetermined position X 1 in a short time instead of the time-consuming mold clamping force control B, and thereafter Molding accuracy is improved by time-consuming clamping force control B.
[0021]
In this embodiment, since the mold clamping position control A is performed in the initial period, mold opening molding can be performed in which injection is performed with a slight gap between the upper mold 10b and the lower mold 10a. FIG. 2 shows such a case (the fact that the mold clamping force at the start of injection compression and at the end of injection compression is 0 indicates this). However, it goes without saying that the mold clamping control method of the present embodiment can be applied to mold closing molding.
[0022]
The control device 8 can arbitrarily select and combine the mold clamping position control A that can be controlled at high speed and the mold clamping force control B that can perform high-precision molding corresponding to the molding resin or the like. As a result, high-precision injection compression control can be performed at high speed.
[0023]
The mold clamping control method of the above embodiments, the mold clamping position control A in the initial period, while ends when the lower platen 9 has reached the target position X 1, the detection value from the mold-clamping force detection device in advance When the set mold clamping force is reached, the mold clamping position control A can be terminated and switched to the mold clamping force control B.
[0024]
As indicated by a virtual line in the lower graph of FIG. 2, the mold clamping position control A reaches a preset mold clamping force (F0) during the movement of the lower platen 9 up to X1 at a high speed. Then, even during the mold clamping position control (A), the mold clamping position control (A) is terminated and switched to the mold clamping force control (B). It becomes possible to reliably cope with changes in the state of the molded resin.
[0025]
The mold clamping force control B of the above embodiment is all performed by mold clamping force feedback speed control as shown in FIG. 4. This mold clamping force control B is performed by constant speed control and force feedback speed control (see FIG. 4)). Specifically, as shown in FIG. 3, the difference between the detected value F ′ from the mold clamping force detection device and the set mold clamping force F is large, and the speed command as an output has an upper limit V 0 and a lower limit −V 0 . When the difference is exceeded, the speed during mold clamping force control is limited to constant speed V 0 and −V 0, and when the difference is small, force feedback speed control is performed. A speed command V similar to that shown in FIG. 4 can be output.
[0026]
The upper and lower speed commands V 0 and −V 0 can be arbitrarily determined.
[0027]
【The invention's effect】
According to the present invention, high-precision and high-speed injection compression molding can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic view of a mold clamping mechanism of an injection molding machine.
FIG. 2 is a timing diagram of a mold clamping force and a mold clamping position during mold clamping control in the embodiment of the present invention.
FIG. 3 is a block diagram of mold clamping force control in the embodiment of the present invention.
FIG. 4 is a control block diagram of mold clamping force.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Servo motor 2 Tie bar 3 Strain sensor 4 Belt 5 Crank mechanism 6 Dogle mechanism 7 Mold opening / closing mechanism 8 Control device 9 Lower platen 10 Mold 10a Lower mold 10b Upper mold 11 Upper platen A Mold clamping position control B Mold clamping force control

Claims (4)

下プラテンを駆動する型締め機構と型締力検出装置と型締め位置検出装置とを有した射出成形機において、上金型を具備した上プラテンを固定し、下金型を具備した下プラテンを可動状態として、型締め制御を行う時に、型締力検出装置により検出された型締力に基づきフィードバック制御する型締力制御と、型締め位置検出装置により検出された型締め位置に基づき制御する型締位置制御とを複合して、下プラテンの移動を制御する方法であって、当初の射出圧縮開始からの初期期間は型締位置制御を行い、下プラテンが所定位置に達した後型締力制御を行い、前記型締位置制御中に型締力検出装置から検出された検出値が予め設定した型締力に達すると、下プラテンが所定位置に達する前であっても、この型締位置制御を型締力制御に切り換えるようにしたことを特徴とする射出成形機の型締め制御方法。In an injection molding machine having a mold clamping mechanism that drives a lower platen, a mold clamping force detection device, and a mold clamping position detection device, the upper platen provided with the upper mold is fixed, and the lower platen provided with the lower mold is fixed. When performing mold clamping control as a movable state, control is performed based on mold clamping force control that performs feedback control based on the mold clamping force detected by the mold clamping force detection device, and mold clamping position detected by the mold clamping position detection device. This is a method of controlling the movement of the lower platen in combination with the mold clamping position control. In the initial period from the start of the initial injection compression, the mold clamping position control is performed, and the mold clamping is performed after the lower platen reaches the predetermined position. there line force control, the detection value detected from the mold clamping force detection device in the mold clamping position control reaches the mold clamping force preset even before the lower platen reaches a predetermined position, this type Turn clamping position control to mold clamping force control Clamping control method for an injection molding machine, characterized in that as changing. 型締力制御後に再び型締め位置制御を行う請求項１記載の射出成形機の型締め制御方法。Clamping control method according to claim 1 Symbol placement of the injection molding machine performs again clamping position control after mold clamping force control. 型締力制御中において、型締力検出装置から検出された検出値と予め設定した設定値の型締力の差のレベルにより、一定速度制御と力フィードバック速度制御との一方から他方に切換えるようにした請求項１または２に記載の射出成形機の型締め制御方法。During mold clamping force control, one of constant speed control and force feedback speed control is switched from one to the other according to the level of the difference between the detected value detected from the mold clamping force detection device and the preset clamping force. clamping control method for an injection molding machine according to 請 Motomeko 1 or 2 was. 一定速度制御における速度指令値を自由に変更できるようにしたことを特徴とする請求項３記載の射出成形機の型締め制御方法。4. The mold clamping control method for an injection molding machine according to claim 3 , wherein a speed command value in the constant speed control can be freely changed.
JP2001097905A 2000-03-30 2001-03-30 Clamping control method of injection molding machine Expired - Fee Related JP4104042B2 (en)

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TWI647440B (en) 2017-02-10 2019-01-11 日商環球晶圓日本股份有限公司 Calibration curve determination method, carbon concentration measurement method, and silicon wafer-manufacturing method

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