JPH02121819A - Screw rotation controller for injection molding machine - Google Patents
Screw rotation controller for injection molding machineInfo
- Publication number
- JPH02121819A JPH02121819A JP27544588A JP27544588A JPH02121819A JP H02121819 A JPH02121819 A JP H02121819A JP 27544588 A JP27544588 A JP 27544588A JP 27544588 A JP27544588 A JP 27544588A JP H02121819 A JPH02121819 A JP H02121819A
- Authority
- JP
- Japan
- Prior art keywords
- time
- accelerating
- decelerating
- acceleration
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001746 injection moulding Methods 0.000 title claims description 9
- 239000011347 resin Substances 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 230000001133 acceleration Effects 0.000 claims description 38
- 238000000465 moulding Methods 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 6
- 230000006698 induction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、射出成形機のスクリュ回転を樹脂特性に応じ
て制御する装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling screw rotation of an injection molding machine according to resin properties.
（従来の技術）
電動機を用いてスクリュの回転駆動を行う場合にサーボ
モータ、インバータ等が用いられるが、ここではインバ
ータを用いたスクリュの回転速度制御の１例を第３図乃
至第５図により説明する。(Prior Art) A servo motor, an inverter, etc. are used when a screw is rotationally driven using an electric motor. Here, an example of controlling the rotational speed of a screw using an inverter is shown in FIGS. 3 to 5. explain.
射出成形機の可塑化工程におけるスクリュ回転は、以下
のような動作をとる。The screw rotation in the plasticizing process of an injection molding machine operates as follows.
ホッパ６には粒状の樹脂ペレット８が貯留されている。Granular resin pellets 8 are stored in the hopper 6 .
スクリュ１は適当な減速比をもつ減速機を介して誘導電
動機４により回転駆動される。このときの回転数指令は
制御装置１０からインバータ１１に与えられ、誘導電動
機４の回転数はインバータ１１の周波数制御によりコン
トロールされる。樹脂ベレット８は、スクリュ１の回転
による剪断発熱とスクリュシリンダ２に巻かれたバンド
ヒータ５による加熱とにより、溶融しながら前方へ移送
され、１回の射出に必要な量の溶融樹脂がスクリュ前部
Ａに貯留される。The screw 1 is rotationally driven by an induction motor 4 via a reduction gear having an appropriate reduction ratio. The rotational speed command at this time is given to the inverter 11 from the control device 10, and the rotational speed of the induction motor 4 is controlled by the frequency control of the inverter 11. The resin pellet 8 is transferred forward while melting due to shear heat generated by the rotation of the screw 1 and heating by the band heater 5 wound around the screw cylinder 2, and the amount of molten resin required for one injection is delivered to the front of the screw. It is stored in section A.
この溶融樹脂は、図示しない油圧シリンダ等によりスク
リュ１を前進させることで、スクリュシリンダ２先端の
ノズル３より図示しない金型に注入され、そこで冷却固
化して成形品となる。This molten resin is injected into a mold (not shown) through a nozzle 3 at the tip of the screw cylinder 2 by advancing the screw 1 using a hydraulic cylinder (not shown), and is cooled and solidified therein to form a molded product.
さて、インバータ１１による制御においては、インバー
タ１１の過電流を防止するため、回転の指令周波数をＯ
から所定の回転数が得られる周波数まで、例えば４Ｐモ
ータの場合でスリップを無視して、所定の回転数をｌ８
００ｒ、ｐ、ｍ、とすると、０から６０Ｈｚまで徐々に
上昇させる。Now, in the control by the inverter 11, in order to prevent overcurrent of the inverter 11, the rotation command frequency is
to the frequency at which a predetermined rotation speed is obtained, for example, in the case of a 4P motor, ignoring slip, the predetermined rotation speed is l8
00r, p, m, the frequency is gradually increased from 0 to 60Hz.
こうすることで指令周波数に基づく回転数と実際の回転
数との差、即ちスリップ過大による過電流を過渡的に防
止し、インバータを保護している。In this way, the difference between the rotation speed based on the command frequency and the actual rotation speed, that is, an overcurrent due to excessive slip is transiently prevented and the inverter is protected.
この周波数を上昇させるカーブは、第４図に示すような
直線的な加・減速や第５図に示すような８字カーブ状の
加・減速曲線が利用される。As a curve for increasing this frequency, a linear acceleration/deceleration curve as shown in FIG. 4 or a figure-eight acceleration/deceleration curve as shown in FIG. 5 is used.
加・減速のこのカーブのパターンはインバータ内部に固
定定数として設定保有している。This acceleration/deceleration curve pattern is stored as a fixed constant inside the inverter.
（発明が解決しようとする課題）
ところで、射出成形機は一般に汎用機がその殆んどであ
り、従って使用する樹脂も多岐にわたり軽負荷の樹脂（
例えば、ｐｓ樹脂）がら重負荷の樹脂（例えば、ＰＣ樹
脂）に至るまで同一成形機が使用され、回転数も高速か
ら低速まで広範囲にわたる。(Problem to be solved by the invention) By the way, most injection molding machines are general-purpose machines, and therefore the resins used are wide-ranging, including light-load resins (
For example, the same molding machine is used for molding resins ranging from PS resins to heavy duty resins (for example, PC resins), and the rotation speed ranges over a wide range from high speeds to low speeds.
これに対し上記の如く同一の加・減速パターンに固定さ
れていると、例えば軽負荷樹脂の低速回転に基づき加・
減速パターンを設定した場合には、重負荷樹脂に対する
高速回転時には過電流が流れることになって、直ちに保
護機能が働き運転が不能となる。また、その逆の場合を
設定すると、加速時間が長くかかり、その分成形サイク
ル時間が長くなる欠点を有している。On the other hand, if the same acceleration/deceleration pattern is fixed as described above, for example, acceleration/deceleration may occur based on the low speed rotation of light-load resin.
If a deceleration pattern is set, an overcurrent will flow during high-speed rotation for a heavily loaded resin, and the protection function will immediately activate, making operation impossible. Moreover, if the opposite case is set, the acceleration time will be long and the molding cycle time will be lengthened accordingly.
こうした点を回避しようとして、従来の加・減速パター
ンを重負荷樹脂に合わせて設定し、同パターンで広範な
樹脂に対応させているのが実情であり、その結果、総じ
て成形サイクルが長くなるという問題点があった。In order to avoid this problem, the current situation is that conventional acceleration/deceleration patterns are set to match heavy-load resins, and the same pattern is compatible with a wide range of resins, resulting in longer molding cycles overall. There was a problem.
本発明はこうした点を排除し、異なる成形条件に対応し
て夫々最適な加・減速パターンに基づいてスクリュ回転
を制御することを可能にした制御装置を提供しようとす
るものである。The present invention aims to eliminate these problems and provide a control device that makes it possible to control screw rotation based on optimal acceleration/deceleration patterns corresponding to different molding conditions.
（課題を解決するための手段）
このため、本発明は射出成形機におけるスクリュの回転
駆動を各種電動機を介して制御する回転制御装置におい
て、各種樹脂の異なる負荷特性に対応するスクリュ回転
の加・減速パターンを２以上設定記憶する記憶手段と、
前記加・減速パターンを任意に選択する手動のスイッチ
手段と、同スイッチ手段の操作により前記記憶された加
・減速パターンのうちから特定のパターンを選定するパ
ターン選定手段と、同選定手段により選定された加・減
速パターンに基づき前記電動機の回転を制御する操作手
段とからなることを禰成とし、これを上記課題の解決手
段とするものである。(Means for Solving the Problems) Therefore, the present invention provides a rotation control device that controls the rotational drive of a screw in an injection molding machine via various electric motors. a storage means for storing two or more deceleration patterns;
a manual switch means for arbitrarily selecting the acceleration/deceleration pattern; a pattern selection means for selecting a specific pattern from among the stored acceleration/deceleration patterns by operating the switch means; and an operating means for controlling the rotation of the electric motor based on the acceleration/deceleration pattern determined, and this is a means for solving the above problem.
（作用）
２以上の加・減速パターンを選択する２以上のスイッチ
の中から、実成形に用いられようとする樹脂の負荷特性
に見合ったパターンに対応するスイッチを押すと、パタ
ーン選定手段により所望の加・減速パターンが選定され
、同パターンに基づいて電動機の駆動を制御し、上記樹
脂に適応する加・減速時間の下でスクリュ回転駆動がな
される。(Function) When a switch corresponding to a pattern suitable for the load characteristics of the resin to be used in actual molding is pressed from among two or more switches for selecting two or more acceleration/deceleration patterns, the pattern selection means selects the desired acceleration/deceleration pattern. The acceleration/deceleration pattern is selected, and the drive of the electric motor is controlled based on the pattern, and the screw rotation is driven under acceleration/deceleration times that are appropriate for the resin.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図に本発明の代表的な実施例である制御ブロック図
を示す、射出成形機のインバータによるスクリュ回転駆
動方法の一般的な説明は従来と同一のため、ここではそ
の説明を省略する。FIG. 1 shows a control block diagram that is a typical embodiment of the present invention. The general explanation of the method for driving the rotation of a screw using an inverter in an injection molding machine is the same as that of the conventional method, so the explanation thereof will be omitted here.
ところで本発明は、既述した如〈従来技術の欠点である
［射出成形機は使用する樹脂が多岐にわたっており、ス
クリュ回転を同一の加・減速パターンで異なる特性をも
つ広範な樹脂に対応しようとすると、加・減速時間に要
する時間を長くせざるを得す、その結果成形サイクル時
間が長くなる。」点を解消することにある。By the way, the present invention overcomes the drawbacks of the prior art, as described above, because injection molding machines use a wide variety of resins, and it is difficult to adapt the screw rotation to a wide range of resins with different characteristics using the same acceleration/deceleration pattern. Then, the time required for acceleration and deceleration must be increased, and as a result, the molding cycle time becomes longer. ” The goal is to resolve the issue.
そのため、本発明はインバータの内部に過電流の保護回
路が働かない範囲内で多種類の加・減速パターンを設定
記憶させておき、これらの加・減速パターンの中から樹
脂の種類に対応したパターンをセレクトスイッチの操作
により選択し、スクリュ回転の加・減速時間を各種樹脂
に適合した時間とし、成形サイクルの合理化を計ってい
る。Therefore, in the present invention, many types of acceleration/deceleration patterns are set and stored within the inverter within a range in which the overcurrent protection circuit does not operate, and a pattern corresponding to the type of resin is selected from among these acceleration/deceleration patterns. is selected by operating a select switch, and the acceleration/deceleration time of the screw rotation is adjusted to suit each type of resin, streamlining the molding cycle.
図示実施例では、上記加・減速パターンを３種類設定し
たもので、そのパターンを第２図に（ａ）〜（Ｃ）で示
している。In the illustrated embodiment, three types of acceleration/deceleration patterns are set, and the patterns are shown in FIG. 2 as (a) to (C).
第２図（ａ）の加・減速パターンは減速時間の設定を加
速時間に対して比較的長くしてあり、軽負荷樹脂（例え
ば、ＰＳ樹脂、ＰＰ樹脂等）用に適したパターンである
。In the acceleration/deceleration pattern shown in FIG. 2(a), the deceleration time is set relatively longer than the acceleration time, and is a pattern suitable for light-load resins (eg, PS resin, PP resin, etc.).
第２図（Ｃ１の加・減速パターンは加速時間を減速時間
よりも極端に長くしたもので、重負荷樹脂（例えば、Ｐ
ＭＭＡ樹脂、ｐｃ樹脂等）用に使われるパターンである
。Figure 2 (The acceleration/deceleration pattern of C1 is one in which the acceleration time is extremely longer than the deceleration time, and the heavy load resin (for example, P
This pattern is used for MMA resin, PC resin, etc.).
第２図（ｂｌの加・減速パターンは加速時間を減速時間
より比較的長くし、軽負荷樹脂と重負荷樹脂の中間に位
置する樹脂に対応させる。The acceleration/deceleration pattern shown in FIG. 2 (bl) makes the acceleration time relatively longer than the deceleration time, and corresponds to a resin located between a light load resin and a heavy load resin.
以上の３種類の加・減速パターンがインバータ１１内に
設定され、各設定パターンの選択は３段階に切換わるセ
レクトスイッチ１２を手動で操作することにより行う。The above three types of acceleration/deceleration patterns are set in the inverter 11, and each setting pattern is selected by manually operating the select switch 12 which changes over in three stages.
図示例では、例えばセレクトスイッチ１２の■を選択す
ると、制御値ｚｉｏを介して設定切換回路１３のＳＷ、
がＯＮＬ、、インバータｌｌ内に設定記憶された第２図
（ａ）に示す加・減速パターンに基づき周波数を制御し
て誘導電動機４の回転速度、即ちスクリュ回転速度を制
御する。In the illustrated example, when, for example, the select switch 12 is selected, the SW of the setting switching circuit 13 is changed via the control value zio.
ONL controls the frequency based on the acceleration/deceleration pattern shown in FIG. 2(a) set and stored in the inverter 11, thereby controlling the rotational speed of the induction motor 4, that is, the screw rotational speed.
またセレクトスイッチ１２の■の選択により設定切換回
路１３のＳＷ、がＯＮＬ、第２図（ｂ）の加・減速パタ
ーンの下でスクリュ１の回転速度が制御され、同じ（セ
レクトスイッチ１２の■を選択すると、設定切換回路１
３のＳＷ３がＯＮして第２図（Ｃ）の加・減速パターン
に基づいてスクリュ１の回転速度が制御される。In addition, by selecting ■ of the select switch 12, the SW of the setting switching circuit 13 is ONL, and the rotational speed of the screw 1 is controlled under the acceleration/deceleration pattern shown in Fig. 2(b). When selected, setting switching circuit 1
SW3 of No. 3 is turned ON, and the rotational speed of the screw 1 is controlled based on the acceleration/deceleration pattern shown in FIG. 2(C).
上記実施例はインバータを介して誘導電動機の加・減速
制御を行う場合の例であるが、当業者であれば本発明を
サーボモータ等各種モータにも適用することが可能であ
ることは以上の説明からも明らかである。Although the above embodiment is an example in which acceleration/deceleration control of an induction motor is performed via an inverter, those skilled in the art will understand that the present invention can also be applied to various motors such as servo motors. It is clear from the explanation.
（発明の効果）
以上、詳細に説明した如く本発明によれば、スクリュ回
転の加・減速時間を樹脂の種類に対応して任意に選択で
きるため、樹脂の負荷特性に適合した時間でスクリュ回
転の加・減速ができ、成形サイクルの短縮が計れる。(Effects of the Invention) As described above in detail, according to the present invention, the acceleration/deceleration time of the screw rotation can be arbitrarily selected according to the type of resin, so the screw rotates at a time that suits the load characteristics of the resin. can be accelerated and decelerated, shortening the molding cycle.
従って、従来の如く成形サイクルの短縮を計るため、重
負荷樹脂に対するスクリュ回転の加速を短時間で出来る
電動機やインバータを選定する必要がなくなり、同時に
電動機等の小型化が計れる。Therefore, in order to shorten the molding cycle as in the past, it is no longer necessary to select an electric motor and an inverter that can accelerate the screw rotation for a heavily loaded resin in a short time, and at the same time, it is possible to downsize the electric motor.
第１図は本発明の代表的な１実施例に係るスクリュ回転
駆動部の構成図、第２図は同実施例によるスクリュ回転
加・減速時間の設定パターン図、第３図は従来のスクリ
ュ回転駆動部を示す構成図、第４図及び第５図は従来の
スクリュ回転加・減速パターン例図である。
図の主要部分の説明
１〇−制御装置
１１− インバータ
１２−・（マニアル）セレクトスイッチ１３・一般定切
換回路Fig. 1 is a configuration diagram of a screw rotation drive unit according to a typical embodiment of the present invention, Fig. 2 is a setting pattern diagram of screw rotation acceleration/deceleration time according to the same embodiment, and Fig. 3 is a diagram of a conventional screw rotation drive unit. FIGS. 4 and 5, which are configuration diagrams showing the drive unit, are examples of conventional screw rotation acceleration/deceleration patterns. Explanation of main parts of the diagram 1 - Control device 11 - Inverter 12 - (Manual) select switch 13 - General constant switching circuit
Claims (1)
介して制御する回転制御装置において、各種樹脂の異な
る負荷特性に対応するスクリュ回転の加・減速パターン
を２以上設定記憶する記憶手段と、前記加・減速パター
ンを任意に選択する手動のスイッチ手段と、同スイッチ
手段の操作により前記記憶された加・減速パターンのう
ちから特定のパターンを選定するパターン選定手段と、
同選定手段により選定された加・減速パターンに基づき
前記電動機の回転を制御する操作手段とからなることを
特徴とする射出成形機のスクリュ回転制御装置。A rotation control device for controlling the rotational drive of a screw in an injection molding machine via various electric motors includes a storage means for setting and storing two or more acceleration/deceleration patterns of screw rotation corresponding to different load characteristics of various resins; a manual switch means for arbitrarily selecting a deceleration pattern; a pattern selection means for selecting a specific pattern from among the stored acceleration/deceleration patterns by operating the switch means;
A screw rotation control device for an injection molding machine, comprising an operating means for controlling rotation of the electric motor based on an acceleration/deceleration pattern selected by the selection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275445A JP2596989B2 (en) | 1988-10-31 | 1988-10-31 | Screw rotation control device of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63275445A JP2596989B2 (en) | 1988-10-31 | 1988-10-31 | Screw rotation control device of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02121819A true JPH02121819A (en) | 1990-05-09 |
| JP2596989B2 JP2596989B2 (en) | 1997-04-02 |
Family
ID=17555627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63275445A Expired - Fee Related JP2596989B2 (en) | 1988-10-31 | 1988-10-31 | Screw rotation control device of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596989B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110126A (en) * | 1990-08-30 | 1992-04-10 | Sumitomo Heavy Ind Ltd | Speed-commanding device of injection molding machine |
| US6284170B1 (en) | 1998-06-17 | 2001-09-04 | Sumitomo Heavy Industries Ltd. | Method for controlling drive of screw in injection molding machine |
| EP1207032A1 (en) * | 2000-11-15 | 2002-05-22 | Sumitomo Heavy Industries, Ltd. | Method for controlling injection molding machine capable of reducing variations in weight of molded product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52115864A (en) * | 1976-03-24 | 1977-09-28 | Niigata Engineering Co Ltd | System for controlling plastic injection molding machine |
| JPS62261418A (en) * | 1986-05-09 | 1987-11-13 | Fanuc Ltd | Injection molder capable of printing molding condition |
-
1988
- 1988-10-31 JP JP63275445A patent/JP2596989B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52115864A (en) * | 1976-03-24 | 1977-09-28 | Niigata Engineering Co Ltd | System for controlling plastic injection molding machine |
| JPS62261418A (en) * | 1986-05-09 | 1987-11-13 | Fanuc Ltd | Injection molder capable of printing molding condition |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110126A (en) * | 1990-08-30 | 1992-04-10 | Sumitomo Heavy Ind Ltd | Speed-commanding device of injection molding machine |
| US6284170B1 (en) | 1998-06-17 | 2001-09-04 | Sumitomo Heavy Industries Ltd. | Method for controlling drive of screw in injection molding machine |
| EP1207032A1 (en) * | 2000-11-15 | 2002-05-22 | Sumitomo Heavy Industries, Ltd. | Method for controlling injection molding machine capable of reducing variations in weight of molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2596989B2 (en) | 1997-04-02 |
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