JPH0429818A - Controlling device for electrically-driven injection molding machine - Google Patents

Controlling device for electrically-driven injection molding machine

Info

Publication number
JPH0429818A
JPH0429818A JP13530890A JP13530890A JPH0429818A JP H0429818 A JPH0429818 A JP H0429818A JP 13530890 A JP13530890 A JP 13530890A JP 13530890 A JP13530890 A JP 13530890A JP H0429818 A JPH0429818 A JP H0429818A
Authority
JP
Japan
Prior art keywords
injection
pressure
screw
speed
molding machine
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.)
Pending
Application number
JP13530890A
Other languages
Japanese (ja)
Inventor
Toshihiko Chijiiwa
敏彦 千々岩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP13530890A priority Critical patent/JPH0429818A/en
Publication of JPH0429818A publication Critical patent/JPH0429818A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • B29C2045/773—Zero point correction

Landscapes

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

Abstract

PURPOSE:To effect the changeover from an injection process to a pressure holding process in a short time in a stable manner to rapidly accomplish a stable state by providing a means to compensate inertia of a injection screw. CONSTITUTION:A compensation unit 30 comprises a speed differentiator 31, an arithmetic unit 32 and an adder 33. The differentiator 31 differentiates speed detection signal from an injection motor speed detector 17 to calculate acceleration. The arithmetic unit 32 estimates inertia force by multiplying acceleration obtained at the differentiator 31 by known mass of an injection screw. The adder 33 adds inertia force obtained at the unit 32 to detected pressure from a load cell 19. In an injection process, as the resin pressure in a mold increases, detected pressure from a load cell 19 increases. Since the inertia force of the screw is added as compensation value to the detected pressure from the cell 19 at the adder 33, a comparator 20 changes over an changeover switch 21 to the side of terminal 21b before actual resin pressure in the mold greatly exceeds a hold pressure command value.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は電動射出成形機の制御装置に関し、特に射出工
程から保圧工程への切換制御の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for an electric injection molding machine, and more particularly to an improvement in switching control from an injection process to a pressure holding process.

（従来の技術） 最近、射出成形機は油圧式のものから電動機式のものに
置き換わりつつある。(Prior Art) Recently, hydraulic type injection molding machines are being replaced by electric motor type ones.

第２図を参照して電動式射出成形機について簡単に説明
する。The electric injection molding machine will be briefly explained with reference to FIG.

射出シリンダ１内に配設された射出スクリュ２の回転駆
動系として、射出スクリュ２の駆動軸に取付けられたス
クリュ回転プーリ３、スクリュ用モータ６、その出力軸
に取付けられたスクリュ回転プーリ４、スクリュ回転プ
ーリ３，４に懸は渡されたスクリュ回転タイミングベル
ト５とによるスクリュ回転駆動系を有する。７はベアリ
ングである。As a rotational drive system for the injection screw 2 disposed in the injection cylinder 1, there are a screw rotation pulley 3 attached to the drive shaft of the injection screw 2, a screw motor 6, a screw rotation pulley 4 attached to its output shaft, A screw rotation drive system is provided with a screw rotation timing belt 5 which is connected to the screw rotation pulleys 3 and 4. 7 is a bearing.

また、射出スクリュの射出駆動系として、プレッシャプ
レート８、このプレッシャプレート８の移動を案内する
ガイドバー９、プレッシャプレート８に設けられたボー
ルねじ１０、このボールねじ１０の一端に設けられた射
出用プーリ１１、射出用モータ１３、その出力軸に取付
けられた射出用プーリ１４、射出用プーリ１１．１４に
懸は渡された射出用タイミングベルト１５とを有する。The injection drive system for the injection screw includes a pressure plate 8, a guide bar 9 for guiding the movement of the pressure plate 8, a ball screw 10 provided on the pressure plate 8, and an injection drive system provided at one end of the ball screw 10. It has a pulley 11, an injection motor 13, an injection pulley 14 attached to its output shaft, and an injection timing belt 15 that is stretched around the injection pulley 11.14.

スクリュ用モータ６にはスクリュモータ用速度検出器１
６が、射出用モータ１３には射出モータ用速度検出器１
７が、プレッシャプレート８にはスクリュ位置検出器１
８がそれぞれ設けられている。ロードセル１９はプレッ
シャプレート８に設けられて射出スクリュ２に加わる樹
脂圧力を検出する。The screw motor 6 is equipped with a screw motor speed detector 1.
6, the injection motor 13 is equipped with an injection motor speed detector 1.
7, the pressure plate 8 is equipped with a screw position detector 1.
8 are provided respectively. A load cell 19 is provided on the pressure plate 8 and detects the resin pressure applied to the injection screw 2.

第３図は第２図に示された電動射出成形機の射出用モー
タの制御系を示す。FIG. 3 shows a control system for the injection motor of the electric injection molding machine shown in FIG.

この制御系は、図示しない設定器からの速度指令値にも
とづいて射出用モータ１３の速度制御を行う速度制御系
と、樹脂圧指令値あるいは保圧指令値にもとづいて射出
用モータ１３を制御する圧力制御系とから成る。これら
２つの制御系は、切換スイッチ２１により切換えられる
。This control system includes a speed control system that controls the speed of the injection motor 13 based on a speed command value from a setting device (not shown), and a speed control system that controls the injection motor 13 based on a resin pressure command value or a pressure holding command value. It consists of a pressure control system. These two control systems are switched by a changeover switch 21.

第２図、第３図を参照して制御動作について説明する。The control operation will be explained with reference to FIGS. 2 and 3.

計量工程が始まると、スクリュ用モータ６を起動し、ス
クリュ回転プーリ３，４、スクリュ回転タイミングベル
ト５を介して射出スクリュ２を回転させる。一方、射出
シリンダ１後方のホッパ（図示省略）から樹脂を溶融さ
せながら射出スクリュ２の先端に送る。When the metering process starts, the screw motor 6 is started to rotate the injection screw 2 via the screw rotation pulleys 3 and 4 and the screw rotation timing belt 5. On the other hand, resin is melted and sent to the tip of the injection screw 2 from a hopper (not shown) behind the injection cylinder 1 .

計量工程においては切換スイッチ２１は端子２１ｂ側、
すなわち保圧力制御器２２側にある。射出スクリュ２先
端の樹脂圧（背圧）を制御するために、図示しない設定
器から減算器２３に対して樹脂圧指令値が出力される。In the weighing process, the changeover switch 21 is on the terminal 21b side,
That is, it is on the holding pressure controller 22 side. In order to control the resin pressure (back pressure) at the tip of the injection screw 2, a resin pressure command value is output from a setting device (not shown) to the subtractor 23.

保圧力制御器２２は、樹脂圧指令値とロードセル１９か
らの検出圧力との差信号にもとづいて制御信号を出力す
る。この制御信号は、切換スイッチ２１、減算器２４、
速度制御器２５、減算器２６、電流制御器２７、インバ
ータ２８を通して射出用モータ１３に与えられる。この
ようにして射出用モータ１３を制御することにより、ボ
ールねじ１０を回転させ、プレッシャプレート８を前進
、後退させて樹脂圧力を制御する。The holding pressure controller 22 outputs a control signal based on a difference signal between the resin pressure command value and the detected pressure from the load cell 19. This control signal includes a changeover switch 21, a subtractor 24,
It is applied to the injection motor 13 through a speed controller 25, a subtracter 26, a current controller 27, and an inverter 28. By controlling the injection motor 13 in this manner, the ball screw 10 is rotated, the pressure plate 8 is moved forward and backward, and the resin pressure is controlled.

次に、射出工程に移行すると切換スイッチ２１は端子２
１ａ１すなわち速度指令値の入力部側に切換えられる。Next, when the injection process begins, the changeover switch 21
1a1, that is, it is switched to the speed command value input section side.

図示しない設定器から所望の速度指令値を与えることに
より、射出モータ用速度検出器１７、減算器２４、速度
制御器２５による速度フィードバック系、インバータ２
８の出力ラインに設けられた電流検出器２９、減算器２
６、電流制御器２７による電流フィードバック系とで、
インバータ２８を通して射出用モータ１３の速度が制御
され、射出スクリュ２が前進する。By giving a desired speed command value from a setting device (not shown), a speed feedback system including an injection motor speed detector 17, a subtractor 24, and a speed controller 25, and an inverter 2
Current detector 29 and subtractor 2 provided on the output line of 8
6. With a current feedback system using a current controller 27,
The speed of the injection motor 13 is controlled through the inverter 28, and the injection screw 2 moves forward.

射出シリンダ１から射出された樹脂が図示されない金型
に充填され始めると、樹脂圧力は徐々に高くなり、この
樹脂圧力は、射出スクリュ２、ベアリング７を介してロ
ードセル１９に加わる。ロードセル１９の検出圧力は、
比較器２０において図示しない設定器から与えられる保
圧指令値と比較され、比較器２０は樹脂圧力の方が大き
くなると切換スイッチ２１を端子２ｉｂ側に切換える。When the resin injected from the injection cylinder 1 begins to fill a mold (not shown), the resin pressure gradually increases, and this resin pressure is applied to the load cell 19 via the injection screw 2 and the bearing 7. The detected pressure of the load cell 19 is
The comparator 20 compares the pressure holding command value given from a setting device (not shown), and when the resin pressure is higher, the comparator 20 switches the changeover switch 21 to the terminal 2ib side.

以下、これをｖ−Ｐ切換時と呼ぶ。このことにより、保
圧力制御器２２が機能して金型内圧力が保圧指令値に一
致するように制御される。Hereinafter, this will be referred to as v-P switching time. This causes the holding pressure controller 22 to function and control the mold internal pressure to match the holding pressure command value.

（発明が解決しようとする課題） ところで、射出成形では、ｖ−Ｐ切換え時の連続性、再
現性が成形品に大きな影響を与える。特に、電動射出成
形機では、油圧射出成形機の場合よりも高精度を要求さ
れるためｖ−Ｐ切換え時の制御は重要である。(Problems to be Solved by the Invention) By the way, in injection molding, continuity and reproducibility at the time of v-P switching have a great influence on the molded product. In particular, in an electric injection molding machine, higher precision is required than in the case of a hydraulic injection molding machine, so control at the time of v-P switching is important.

これに対し、電動射出成形機では上述したように、樹脂
の射出を射出スクリュ２後方のプレッシャプレート８に
設けたロードセル１９により行なっており、ｖ−Ｐ切換
時の検出圧力は射出スクリュの慣性力の影響を受ける。On the other hand, as mentioned above, in an electric injection molding machine, the resin is injected by the load cell 19 installed on the pressure plate 8 behind the injection screw 2, and the detected pressure at the time of v-P switching is determined by the inertia force of the injection screw. be influenced by.

このことを第４図を参照して説明すると、ロードセル１
９による検出圧力は第４図ａに実線で示すように時間経
過と共に増加し、保圧指令値に達するとｖ−Ｐ切換えが
行われる。この時射出用モータ１３は回転を停止すべく
減速動作に入る（第４図ｂ）が、ロードセル１９は射出
スクリュ２の慣性力の影響を除去することができず、ロ
ードセル１９の検出圧力は実際の樹脂圧力よりも小さく
なる。すなわち、実際の樹脂圧力は第４図ａの破線で示
すように変化しているにもかかわらず、ロードセル１９
の検出圧力は実線で示すようになる。これはｖ−Ｐ切換
時間が長くなり、樹脂圧力の行き過ぎが大きくなること
を意味し、成形品に悪影響を及ぼすことを意味する。To explain this with reference to FIG. 4, load cell 1
The detected pressure by 9 increases with the passage of time as shown by the solid line in FIG. 4a, and when it reaches the holding pressure command value, v-P switching is performed. At this time, the injection motor 13 enters deceleration operation to stop its rotation (Fig. 4b), but the load cell 19 cannot eliminate the influence of the inertia force of the injection screw 2, and the detected pressure of the load cell 19 is actually is smaller than the resin pressure. In other words, even though the actual resin pressure is changing as shown by the broken line in FIG. 4a, the load cell 19
The detected pressure is shown by the solid line. This means that the v-P switching time becomes longer and the resin pressure increases excessively, which has an adverse effect on the molded product.

このような問題点に鑑み、本発明の課題はＶ−Ｐ切換時
の射出スクリュの慣性力の影響を排除できるようにして
正確な樹脂圧力制御を行うことのできる電動射出成形機
の制御装置を提供することにある。In view of these problems, an object of the present invention is to provide a control device for an electric injection molding machine that can eliminate the influence of the inertia force of the injection screw at the time of V-P switching and can perform accurate resin pressure control. It is about providing.

（課題を解決するための手段） 本発明は、圧力指令値と樹脂圧力検出手段からの樹脂圧
力検出値とにもとづいて樹脂圧力を制御する圧力制御系
と、速度指令値と射出用モータの回転速度検出手段から
の速度検出値とにもとづいて前記射出用モータの速度を
制御する速度制御系とを含む電動射出成形機の制御装置
において、前記回転速度検出手段からの速度検出値にも
とづいて前記樹脂圧力検出値を補正して射出スクリュの
慣性力の影響を除去する補償手段を備えたことを特徴と
する。(Means for Solving the Problems) The present invention provides a pressure control system that controls resin pressure based on a pressure command value and a resin pressure detection value from a resin pressure detection means, and a speed command value and rotation of an injection motor. A control device for an electric injection molding machine including a speed control system that controls the speed of the injection motor based on a speed detection value from the rotational speed detection means, The present invention is characterized in that it includes a compensation means for correcting the resin pressure detection value to eliminate the influence of the inertial force of the injection screw.

なお、前記補償手段は、前記回転速度検出手段からの速
度検出値を微分する手段と、該微分手段からの出力に前
記射出スクリュの質量を乗算する手段と、該乗算手段の
出力を前記樹脂圧力検出手段の出力に加算する手段とか
ら成る。The compensation means includes means for differentiating the speed detection value from the rotational speed detection means, means for multiplying the output from the differentiating means by the mass of the injection screw, and the output of the multiplication means for calculating the resin pressure. and means for adding to the output of the detection means.

（作用） 本発明による補償手段は、射出用モータの回転速度検出
手段からの速度検出信号を微分することで加速度を得、
この加速度に射出スクリュの質量を乗算することで射出
スクリュの慣性力を推定する。そして、ロードセル等の
検出圧力に上記推定値を加算することで、射出スクリュ
の慣性に起因した検出圧力の不足分を補償する。(Function) The compensation means according to the present invention obtains acceleration by differentiating the speed detection signal from the rotational speed detection means of the injection motor,
The inertial force of the injection screw is estimated by multiplying this acceleration by the mass of the injection screw. Then, by adding the estimated value to the pressure detected by the load cell or the like, the deficiency in the detected pressure caused by the inertia of the injection screw is compensated for.

（実施例） 第１図を参照して本発明の一実施例について説明する。(Example) An embodiment of the present invention will be described with reference to FIG.

第１図において、この制御装置は第３図に示された制御
装置に、射出スクリュの慣性による影響を補償する補償
部３０を設けた点に特徴がある。In FIG. 1, this control device is different from the control device shown in FIG. 3 in that it is provided with a compensator 30 for compensating for the influence of inertia of the injection screw.

補償部３０は、速度微分器３１、演算部３２、及び加算
器３３から成る。The compensation section 30 includes a velocity differentiator 31, an arithmetic section 32, and an adder 33.

速度微分器３１は、射出モータ用速度検出器１７からの
速度検出信号を微分して加速度を算出する。The speed differentiator 31 calculates acceleration by differentiating the speed detection signal from the injection motor speed detector 17.

演算部３２は、速度微分器３１で得られた加速度と既知
の射出スクリュ２の質量とを乗算することで、射出スク
リュ２の慣性力を推定する。The calculation unit 32 estimates the inertia force of the injection screw 2 by multiplying the acceleration obtained by the velocity differentiator 31 and the known mass of the injection screw 2.

加算器３３は、ロードセル１９の検出圧力に演算部３２
で得られた慣性力を加算する。すなわち、Ｖ−Ｐ切換時
のロードセル１９の検出圧力は射出スクリュ２の慣性力
性だけ補償される。The adder 33 adds the pressure detected by the load cell 19 to the calculation unit 32.
Add the inertial force obtained in . That is, the pressure detected by the load cell 19 at the time of V-P switching is compensated for by the inertia of the injection screw 2.

７ヘー、 一゛９ 計量工程及び射出工程における速度制御は従来例と同じ
である。7.9 Speed control in the metering process and injection process is the same as in the conventional example.

射出工程に移行すると、全型内樹脂圧力の上昇と共にロ
ードセル１９の検出圧力も高くなる。ロードセル１９の
検出圧力には加算器３３により射出スクリュ２の慣性力
性が補償値として加算されるので、実際の全型内樹脂圧
力が保圧指令値を大幅に越えないうちに比較器２０によ
り■−Ｐ切換えが行われる。これは、Ｖ−Ｐ切換えが速
やかに行われ、しかも短時間で保圧工程が整定状態にな
ることを意味する。すなわち、全型内樹脂圧力が第４図
ａに示した破線のように突出することを防止できるので
、保圧力制御器２２による保圧力制御も速やかに整定状
態になる。When the injection process begins, the pressure detected by the load cell 19 increases as the resin pressure within the entire mold increases. Since the inertia of the injection screw 2 is added as a compensation value to the detected pressure of the load cell 19 by the adder 33, the comparator 20 adds the inertia of the injection screw 2 as a compensation value to the pressure detected by the load cell 19. ■-P switching is performed. This means that the V-P switching is performed quickly and the pressure holding process is brought to a stable state in a short time. That is, since the total resin pressure within the mold can be prevented from protruding as indicated by the broken line shown in FIG. 4a, the holding pressure control by the holding pressure controller 22 quickly becomes stable.

（発明の効果） 以上説明してきたように本発明によれば、射出スクリュ
の慣性を補償する手段を備えたことにより、射出工程か
ら保圧工程への切換えを短時間かつ安定に行うことがで
き、速やかに整定状態に移行せしめることができる。(Effects of the Invention) As explained above, according to the present invention, by providing a means for compensating the inertia of the injection screw, it is possible to switch from the injection process to the pressure holding process in a short time and stably. , it is possible to quickly shift to a stable state.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明による電動射出成形機の制御装置のブロ
ック図、第２図は本発明が適用される電動射出成形機の
概略構成図、第３図は従来の制御装置のブロック図、第
４図は電動射出成形機における射出工程から保圧工程へ
の移行を説明するための特性図。 図中、１は射出シリンダ、２は射出スクリュ、６はスク
リュ用モータ、８はプレッシャプレート、１０はボール
ねじ、１３は射出用モータ、３０は補償部、３１は速度
微分器、３２は演算部。 ｖ−Ｐ切換開始FIG. 1 is a block diagram of a control device for an electric injection molding machine according to the present invention, FIG. 2 is a schematic configuration diagram of an electric injection molding machine to which the present invention is applied, and FIG. 3 is a block diagram of a conventional control device. FIG. 4 is a characteristic diagram for explaining the transition from the injection process to the pressure holding process in an electric injection molding machine. In the figure, 1 is an injection cylinder, 2 is an injection screw, 6 is a screw motor, 8 is a pressure plate, 10 is a ball screw, 13 is an injection motor, 30 is a compensation section, 31 is a speed differentiator, and 32 is a calculation section . v-P switching start

Claims (2)

【特許請求の範囲】[Claims] （１）圧力指令値と樹脂圧力検出手段からの樹脂圧力検
出値とにもとづいて樹脂圧力を制御する圧力制御系と、
速度指令値と射出用モータの回転速度検出手段からの速
度検出値とにもとづいて前記射出用モータの速度を制御
する速度制御系とを含む電動射出成形機の制御装置にお
いて、前記回転速度検出手段からの速度検出値にもとづ
いて前記樹脂圧力検出値を補正して射出スクリュの慣性
力の影響を除去する補償手段を備えたことを特徴とする
電動射出成形機の制御装置。(1) a pressure control system that controls resin pressure based on a pressure command value and a resin pressure detection value from a resin pressure detection means;
A control device for an electric injection molding machine including a speed control system that controls the speed of the injection motor based on a speed command value and a speed detection value from a rotation speed detection means of the injection motor, the rotation speed detection means 1. A control device for an electric injection molding machine, comprising a compensating means for correcting the resin pressure detection value based on the speed detection value from the injection screw to eliminate the influence of the inertial force of the injection screw. （２）請求項（１）記載の制御装置において、前記補償
手段は、前記回転速度検出手段からの速度検出値を微分
する手段と、該微分手段からの出力に前記射出スクリュ
の質量を乗算する手段と、該乗算手段の出力を前記樹脂
圧力検出手段の出力に加算する手段とから成ることを特
徴とする電動射出成形機の制御装置。(2) In the control device according to claim (1), the compensating means includes means for differentiating a speed detection value from the rotational speed detecting means, and multiplying the output from the differentiating means by the mass of the injection screw. A control device for an electric injection molding machine, comprising: means for adding the output of the multiplication means to the output of the resin pressure detection means.
JP13530890A 1990-05-28 1990-05-28 Controlling device for electrically-driven injection molding machine Pending JPH0429818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13530890A JPH0429818A (en) 1990-05-28 1990-05-28 Controlling device for electrically-driven injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13530890A JPH0429818A (en) 1990-05-28 1990-05-28 Controlling device for electrically-driven injection molding machine

Publications (1)

Publication Number Publication Date
JPH0429818A true JPH0429818A (en) 1992-01-31

Family

ID=15148690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13530890A Pending JPH0429818A (en) 1990-05-28 1990-05-28 Controlling device for electrically-driven injection molding machine

Country Status (1)

Country Link
JP (1) JPH0429818A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2684592A1 (en) * 1991-12-07 1993-06-11 Bosch Gmbh Robert METHOD AND DEVICE FOR REGULATING AN INJECTION OPERATION, IN PARTICULAR OF THERMOPLASTIC SYNTHETIC MATERIAL.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2684592A1 (en) * 1991-12-07 1993-06-11 Bosch Gmbh Robert METHOD AND DEVICE FOR REGULATING AN INJECTION OPERATION, IN PARTICULAR OF THERMOPLASTIC SYNTHETIC MATERIAL.

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