JPH0431284B2 - - Google Patents
Info
- Publication number
- JPH0431284B2 JPH0431284B2 JP5604685A JP5604685A JPH0431284B2 JP H0431284 B2 JPH0431284 B2 JP H0431284B2 JP 5604685 A JP5604685 A JP 5604685A JP 5604685 A JP5604685 A JP 5604685A JP H0431284 B2 JPH0431284 B2 JP H0431284B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- screw position
- control device
- injection
- completion
- 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.)
- Expired
Links
- 238000001746 injection moulding Methods 0.000 claims description 9
- 239000012778 molding material Substances 0.000 claims 2
- 238000002347 injection Methods 0.000 description 18
- 239000007924 injection Substances 0.000 description 18
- 239000000463 material Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は電動式射出成形機の計量完了時のスク
リユ位置を射出直前まで保持するスクリユ位置保
持制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screw position holding control device for holding the screw position at the time of completion of metering in an electric injection molding machine until immediately before injection.
［従来技術］
従来、射出成形機は、加熱シリンダ内にスクリ
ユを配設して成り、該スクリユの回転によりホツ
パーから供給されるプラスチツク材料を溶解して
射出ノズル近傍に貯める。このとき、溶解したプ
ラスチツク材の流体圧によつて後退するスクリユ
の位置を検出して計量を行ない、計量完了後、ス
クリユを直線的にピストン作動させて金型に射出
成形している。[Prior Art] Conventionally, an injection molding machine has a screw disposed within a heating cylinder, and the rotation of the screw melts plastic material supplied from a hopper and stores it near an injection nozzle. At this time, the position of the screw, which is retracted by the fluid pressure of the melted plastic material, is detected and measured, and after the measurement is completed, the screw is actuated linearly with a piston to perform injection molding into the mold.
上記の如き射出成形機において、従来、プラス
チツク材料が定量金型に充填される為に、計量完
了から射出開始までスクリユ位置が変わらないよ
うにする手段として、スクリユ背圧を測定制御し
て調整する制御装置が特開昭48−56751号公報に
見られる。 Conventionally, in the above-mentioned injection molding machines, the screw back pressure is measured and controlled as a means to prevent the screw position from changing from the completion of metering to the start of injection in order to fill the mold with a fixed amount of plastic material. A control device can be found in Japanese Patent Application Laid-Open No. 48-56751.
しかしながら、上記制御装置においては、スク
リユ背圧を調整するものであるから、シリンダ内
のプラスチツク材料から発生するガスにより、計
量完了時から射出開始直前までの間にスクリユ位
置が変つてしまい、その為、射出開始時のスクリ
ユ位置が射出ごとにばらつき、射出工程をプログ
ラム制御した場合、各ステツプごとのプラスチツ
ク材料の充填量がばらつくという問題があつた。 However, since the above control device adjusts the screw back pressure, the screw position changes due to the gas generated from the plastic material in the cylinder between the time of completion of metering and just before the start of injection. There was a problem in that the screw position at the start of injection varied from injection to injection, and when the injection process was controlled by a program, the amount of plastic material filled in each step varied.
［発明の目的］
本発明は上記問題点を解決し、射出ごとに計量
完了時から射出直前までスクリユ位置が変化しな
いようにスクリユ位置を保持制御して射出ごとに
金型に射出するプラスチツク材料の量が一定にな
るようにスクリユ位置を保持する制御装置を提供
することを目的とする。[Object of the Invention] The present invention solves the above-mentioned problems and provides a method for injecting plastic material into a mold each time the screw position is maintained and controlled so that the screw position does not change from the time of completion of metering to just before injection. It is an object of the present invention to provide a control device that maintains the screw position so that the amount of the screw remains constant.
［発明の概要］
本発明は、計量完了時のスクリユ位置を検出し
て、これを目標値とし、射出開始直前までその位
置を保持するように、加熱シリンダ内で発生する
ガス圧などで変化するスクリユ位置を検出してフ
イードバツクし、スクリユを作動させるモータに
操作信号を送り、モータを作動させて計量完了時
の位置にスクリユ位置を保持するようにしたこと
を特徴としたスクリユ位置保持制御装置である。[Summary of the Invention] The present invention detects the screw position at the end of metering, sets this as a target value, and changes the screw position using gas pressure generated within the heating cylinder, etc., so as to maintain that position until immediately before injection starts. A screw position holding control device that detects the screw position, performs feedback, sends an operation signal to the motor that operates the screw, and operates the motor to maintain the screw position at the position at which measurement is completed. be.
［発明の実施例］
以下、本発明の実施例を第１，２図に基づいて
説明する。[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described based on FIGS. 1 and 2.
射出成形機の概要を説明すると、スクリユ１は
周知の如く加熱シリンダ内に収納されてスクリユ
１の回転によりプラスチツク材料は流体化されつ
つ射出ノズル近傍の帯留域に送られ、同時にサー
ボモータ６の回転により、ギヤ４，５を介してギ
ヤ４と一体のナツト３が回転し、スクリユ１と一
体のネジ軸２に螺合するナツト３によりスクリユ
１は直線的に前後進するようになつている。 To give an overview of the injection molding machine, as is well known, the screw 1 is housed in a heating cylinder, and as the screw 1 rotates, the plastic material is fluidized and sent to a zone near the injection nozzle, and at the same time, the servo motor 6 rotates. As a result, the nut 3 integral with the gear 4 rotates via the gears 4 and 5, and the screw 1 is moved linearly back and forth by the nut 3 screwed onto the screw shaft 2 integral with the screw 1.
プラスチツク材料の計量はスクリユ１が後退し
てスクリユ位置検出器７で位置検出して検出信号
を増幅器９を介して、シーケンスを制御する制御
装置１３に送つて、制御装置１３に予め記憶して
ある計量完了目標値に達すると計量が完了するよ
うになつている。なお、制御装置１３には予め計
量完了目標値がセツトしてある。 To measure the plastic material, the screw 1 is moved back, the screw position detector 7 detects the position, and the detection signal is sent via the amplifier 9 to the control device 13 that controls the sequence, and is stored in the control device 13 in advance. The measurement is completed when the measurement completion target value is reached. Note that a metering completion target value is set in advance in the control device 13.
以上の如き作動が行なわれる際、計量完了時か
ら射出開始直前までの間、計量完了時のスクリユ
位置を保持する制御装置について以下説明する。 A control device that maintains the screw position at the time of completion of metering from the time of completion of metering to immediately before the start of injection when the above operations are performed will be described below.
スクリユ位置フイードバツク回路１０は成形動
作に合わせて作動する制御装置１３からの作動・
停止信号により作動するようになつている。 The screw position feedback circuit 10 is activated by a control device 13 that operates in accordance with the molding operation.
It is activated by a stop signal.
制御装置１３は切換器１５，１６及びワンシヨ
ツトマルチバイブレータ１４に接続して制御信号
を送る。スクリユ位置検出器７の検出信号は増幅
器９を介してサンプルホールド回路１１、反転増
幅器１２にそれぞれ送られる。加算器１７はサン
プルホールド回路１１、反転増幅器１２からの信
号をそれぞれ入力して偏差を算出し、それをサー
ボアンプ８に送る。サーボアンプ８はそれを増幅
し、操作信号としてサーボモータ６に送出するよ
うになつている。 The control device 13 is connected to the switching devices 15, 16 and the one-shot multivibrator 14 to send control signals. A detection signal from the screw position detector 7 is sent via an amplifier 9 to a sample hold circuit 11 and an inverting amplifier 12, respectively. The adder 17 inputs the signals from the sample hold circuit 11 and the inverting amplifier 12, calculates a deviation, and sends it to the servo amplifier 8. The servo amplifier 8 amplifies the signal and sends it to the servo motor 6 as an operation signal.
次に計量完了時にスクリユ位置を保持する制御
装置の作用を第１図の回路図と第２図のタイムチ
ヤートを参照して説明する。 Next, the operation of the control device that maintains the screw position upon completion of metering will be explained with reference to the circuit diagram of FIG. 1 and the time chart of FIG. 2.
計量完了時制御装置１３からの信号がオンする
と、ワンシヨツトマルチバイブレータ１４が作動
し、サンプルホールド回路１１のイネーブル信号
を出力する。ワンシヨツトマルチバイブレータ１
４の作動時間が20〜30ミリ秒に設定してあるの
で、サンプルホールド回路１１はイネーブル信号
がある間、スクリユ位置検出器７からの検出値を
増幅器９を介して入力保持する。そのイネーブル
信号が落ちると、サンプルホールド回路１１はワ
ンシヨツトマルチバイブレータ１４の作動終了時
のスクリユ位置検出信号を保持する。 When the signal from the control device 13 is turned on at the time of completion of measurement, the one shot multivibrator 14 is activated and outputs an enable signal for the sample and hold circuit 11. One-shot multivibrator 1
4 is set to 20 to 30 milliseconds, the sample hold circuit 11 inputs and holds the detected value from the screw position detector 7 via the amplifier 9 while the enable signal is present. When the enable signal falls, the sample-and-hold circuit 11 holds the screw position detection signal when the one-shot multivibrator 14 finishes operating.
前記制御装置１３からのオン信号により、ワン
シヨツトマルチバイブレータ１４の作動と同時
に、切換器１５，１６もオンとなり、スクリユ位
置保持のフイードバツク制御が始まる。 In response to the ON signal from the control device 13, the one-shot multivibrator 14 is activated and the switches 15 and 16 are also turned ON, and feedback control for maintaining the screw position begins.
ワンシヨツトマルチバイブレータ１４の作動終
了後、サンプルホールド回路１１からの信号は、
切換器１５を介して加算器１７に入力され、スク
リユ位置を保持する制御系の目標値となる。 After the operation of the one shot multivibrator 14 is completed, the signal from the sample hold circuit 11 is
The value is input to the adder 17 via the switch 15 and becomes a target value for the control system that maintains the screw position.
一方、ワンシヨツトマルチバイブレータ１４の
作動終了後、スクリユ位置検出器７の検出値は増
幅器９、反転増幅器１２、切換器１６を介して加
算器１７に入力する。加算器１７は前記スクリユ
位置の目標値と検出値とを比較演算してその偏差
値をサーボアンプ８に入力する。サーボアンプ８
は、これを必要に応じてPID補償演算実行後増幅
して操作信号となし、サーボモータ６を駆動制御
する。これにより、スクリユを計量完了時の位置
に一定に保持する。 On the other hand, after the operation of the one-shot multivibrator 14 is completed, the detected value of the screw position detector 7 is inputted to the adder 17 via the amplifier 9, the inverting amplifier 12, and the switch 16. The adder 17 compares and calculates the target value and the detected value of the screw position and inputs the deviation value to the servo amplifier 8. Servo amplifier 8
After performing PID compensation calculation, this is amplified as necessary and used as an operation signal to drive and control the servo motor 6. Thereby, the screw is held constant at the position at the time of completion of metering.
このようにスクリユを計量完了時の位置に保持
しておくと、射出開始時に、常にスクリユのピス
トン運動により定量のプラスチツク材料を金型に
充填できることとなる。 By holding the screw in the position at which metering is completed in this way, a fixed amount of plastic material can always be filled into the mold by the piston movement of the screw at the start of injection.
また、射出開始直前に制御装置１３からの信号
を切ると切換器１５，１６はオフとなり、スクリ
ユ位置保持のフイードバツク制御は停止する。 Further, when the signal from the control device 13 is turned off immediately before the start of injection, the switches 15 and 16 are turned off, and the feedback control for maintaining the screw position is stopped.
［発明の効果］
本発明は、スクリユ位置フイードバツク回路に
より計量完了時におけるスクリユ位置を常に射出
直前まで保持しているので、射出工程でのスクリ
ユの直線的一定運動によつて常に一定のプラスチ
ツク材料を金型に充填することができ、射出ごと
にその充填量がばらつくことなく、従来のように
計量完了時におけるスクリユ位置の変化に合わせ
て、スクリユ背圧を調整しないですむから、射出
成形機の成形条件の設定の手間を減らすことがで
きるという効果を奏する。[Effects of the Invention] The present invention uses a screw position feedback circuit to always maintain the screw position at the time of completion of metering until immediately before injection, so that constant linear movement of the screw during the injection process always maintains a constant amount of plastic material. The mold can be filled, the amount of filling does not vary from injection to injection, and there is no need to adjust the screw back pressure according to the change in the screw position when measuring is completed, which is the case with conventional methods. This has the effect of reducing the effort required to set molding conditions.
第１図本発明のスクリユ位置保持制御装置のブ
ロツク回路図、第２図はタイムチヤート図を示
す。
１……スクリユ、２……ネジ軸、３……ナツ
ト、４，５……ギヤ、６……サーボモータ、７…
…スクリユ位置検出器、８……サーボアンプ、９
……増幅器、１０……スクリユ位置フイードバツ
ク回路、１１……サンプルホールド回路、１２…
…反転増幅器、１３……制御装置、１４……ワン
シヨツトマルチバイブレータ、１５，１６……切
換器、１７……加算器。
FIG. 1 shows a block circuit diagram of the screw position holding control device of the present invention, and FIG. 2 shows a time chart. 1... Screw, 2... Screw shaft, 3... Nut, 4, 5... Gear, 6... Servo motor, 7...
... Screw position detector, 8 ... Servo amplifier, 9
...Amplifier, 10...Screw position feedback circuit, 11...Sample hold circuit, 12...
...Inverting amplifier, 13...Control device, 14...One-shot multivibrator, 15, 16...Switcher, 17...Adder.
Claims (1)
スクリユ位置を保持するための制御装置におい
て、スクリユ位置を検出するスクリユ位置検出器
と、このスクリユ位置検出器で検出される射出成
形材計量完了時のスクリユ位置を保持するサンプ
ルホールド回路と、このサンプルホールド回路に
保持されたスクリユ位置を目標値として前記スク
リユ位置検出器で検出したスクリユ位置と比較す
る加算器と、この加算器からの偏差出力に応じて
スクリユを駆動するモータとを備え、射出成形材
計量完了時のスクリユ位置を保持することを特徴
とする射出成形機のスクリユ位置保持制御装置。1. In a control device for maintaining the screw position at the time of completion of measuring the injection molding material in an injection molding machine, there is a screw position detector that detects the screw position and a screw position detector that detects the screw position at the time of completion of measuring the injection molding material detected by this screw position detector. A sample and hold circuit that holds the screw position, an adder that compares the screw position held in the sample and hold circuit with the screw position detected by the screw position detector as a target value, and a What is claimed is: 1. A screw position holding control device for an injection molding machine, comprising: a motor for driving a screw;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5604685A JPS61215029A (en) | 1985-03-22 | 1985-03-22 | Device of holding and controlling screw position of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5604685A JPS61215029A (en) | 1985-03-22 | 1985-03-22 | Device of holding and controlling screw position of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61215029A JPS61215029A (en) | 1986-09-24 |
| JPH0431284B2 true JPH0431284B2 (en) | 1992-05-26 |
Family
ID=13016141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5604685A Granted JPS61215029A (en) | 1985-03-22 | 1985-03-22 | Device of holding and controlling screw position of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61215029A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62124925A (en) * | 1985-11-27 | 1987-06-06 | Fanuc Ltd | Metering method in injection molding machine |
| JPH01192521A (en) * | 1988-01-29 | 1989-08-02 | Japan Steel Works Ltd:The | Control method of screw of injection molding machine and device |
-
1985
- 1985-03-22 JP JP5604685A patent/JPS61215029A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61215029A (en) | 1986-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |