JPH0671705A - Sack-back controller for injection molding machine - Google Patents
Sack-back controller for injection molding machineInfo
- Publication number
- JPH0671705A JPH0671705A JP22897992A JP22897992A JPH0671705A JP H0671705 A JPH0671705 A JP H0671705A JP 22897992 A JP22897992 A JP 22897992A JP 22897992 A JP22897992 A JP 22897992A JP H0671705 A JPH0671705 A JP H0671705A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection screw
- injection
- target value
- speed
- 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
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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
- B29C2045/5032—Drive means therefor using means for detecting injection or back pressures
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C2045/5096—Axially movable screw decompression of the moulding material by retraction or opposite rotation of the screw
-
- 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
- B29C2945/76177—Location of measurement
- B29C2945/7618—Injection unit
- B29C2945/76187—Injection unit screw
-
- 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
- B29C2945/76367—Metering
-
- 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
- B29C2945/76658—Injection unit
- B29C2945/76692—Injection unit 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、射出成形機において、
計量工程の完了後に射出スクリュを無回転で僅かに後退
させるサックバックの制御装置に関する。The present invention relates to an injection molding machine,
The present invention relates to a suckback control device that slightly retracts an injection screw non-rotatingly after completion of a weighing process.
【０００２】[0002]
【従来の技術】射出ノズルからの樹脂漏れを防止するた
めに行う射出スクリュのサックバックのやり方として、
従来、計量完了後に、射出スクリュを所定ストローク後
退させる方式と、所定時間後退させる方式、及び加熱筒
の射出ノズルの部分に専用の圧力センサを取り付けて計
量樹脂の圧力を検出し、樹脂圧力が所定値になったとこ
ろで射出スクリュを停止させる方式（特開平１−１４８
５２６号公報）が知られている。2. Description of the Related Art As a method of suckback of an injection screw to prevent resin leakage from an injection nozzle,
Conventionally, after the metering is completed, the method of retracting the injection screw by a predetermined stroke, the method of retracting the injection screw for a predetermined time, and a dedicated pressure sensor attached to the injection nozzle part of the heating cylinder to detect the pressure of the measuring resin, the resin pressure is set to a predetermined value. A method of stopping the injection screw when the value becomes a value (Japanese Patent Laid-Open No. 1-148).
No. 526) is known.
【０００３】[0003]
【発明が解決しようとする課題】前二者のストローク制
御方式と時間制御方式は、計量樹脂の圧力とは直接関係
のない作動となるため、圧力が残っていて樹脂漏れを生
じたり、また射出スクリュを後退させすぎて樹脂圧を負
圧にしてしまうなどの問題点がある。後者の圧力制御方
式は計量樹脂の圧力を直接検出するため、上記のような
問題点はない。しかし、加熱筒に孔をあけて圧力センサ
をわざわざ取り付けなければならない上、圧力センサが
固定盤と干渉しやすく、しかも、圧力センサは２００〜
３００℃にも及ぶ高温の加熱筒や溶融樹脂によって常時
加熱されるため寿命が短い、などの問題点がある。The stroke control method and the time control method of the former two are operations that are not directly related to the pressure of the measuring resin, so that the pressure remains and resin leakage occurs, and the injection is performed. There is a problem in that the screw is retracted too much and the resin pressure becomes a negative pressure. Since the latter pressure control method directly detects the pressure of the measuring resin, it does not have the above problems. However, the pressure sensor must be purposely attached by making a hole in the heating cylinder, and the pressure sensor easily interferes with the fixed plate.
There is a problem that the life is short because it is constantly heated by a heating cylinder or molten resin having a high temperature of up to 300 ° C.
【０００４】本発明は、加熱筒に孔をあけて圧力センサ
を取り付ける必要がなく、また、固定盤に対する圧力セ
ンサの接触、及び加熱による圧力センサの寿命低下を全
く考慮しないですむ、射出成形機のサックバック制御装
置を提供することを目的とする。According to the present invention, there is no need to attach a pressure sensor by making a hole in the heating cylinder, and there is no need to consider the contact of the pressure sensor with the fixed plate and the shortening of the life of the pressure sensor due to heating. An object of the present invention is to provide a suck-back control device for the same.
【０００５】[0005]
【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、本発明は、移動用駆動装置によって動かされる可
動部材と該可動部材によって加熱筒に対して移動させら
れる射出スクリュとの間に設けられた圧力センサと、上
記移動用駆動装置の制御回路と、移動用駆動装置による
射出スクリュのサックバック完了時における圧力の目標
値を設定する目標値設定器と、上記圧力センサで検出さ
れた圧力と目標値設定器に設定された圧力とを比較し、
圧力センサの検出圧力と目標値設定器に設定された目標
値との関係が所定の関係となった場合に上記制御回路に
停止指令を出力して射出スクリュのサックバックを停止
させる比較器と、射出スクリュのサックバック時に上記
制御回路に射出スクリュの速度指令を出力する速度指令
回路とを具備した構成とした。In order to achieve the above object, the present invention is provided between a movable member moved by a moving drive device and an injection screw moved by the movable member with respect to a heating cylinder. A pressure sensor provided, a control circuit for the moving drive device, a target value setter for setting a target value of pressure when suck back of the injection screw by the moving drive device is completed, and the pressure sensor Compare the pressure with the pressure set in the target value setter,
A comparator that outputs a stop command to the control circuit to stop suckback of the injection screw when the relationship between the detected pressure of the pressure sensor and the target value set in the target value setting device becomes a predetermined relationship, The structure is provided with a speed command circuit that outputs a speed command of the injection screw to the control circuit when the injection screw is sucked back.
【０００６】[0006]
【作用】圧力センサは、移動用駆動装置によって動かさ
れる可動部材と該可動部材によって加熱筒に対して動か
される射出スクリュとの間に設けられているので、固定
盤と干渉することはない。また圧力センサは、溶融樹脂
に直接触れることはなく、加熱筒から離れていて高温に
熱せられることもないので、温度面の悪影響がなく長期
間にわたって精度よく使用することができる。Since the pressure sensor is provided between the movable member moved by the moving drive unit and the injection screw moved by the movable member with respect to the heating cylinder, it does not interfere with the fixed platen. Further, since the pressure sensor does not come into direct contact with the molten resin and is not separated from the heating cylinder and is not heated to a high temperature, there is no adverse effect on the temperature surface and the pressure sensor can be used accurately for a long period of time.
【０００７】[0007]
【実施例】図１ないし図３は本発明に係る射出成形機の
サックバック制御装置の一実施例を示す。これらの図に
おいて符号１はフロントプレートである。フロントプレ
ート１には加熱筒２が固定されている。フロントプレー
ト１の後方（図１で右方）にはリヤプレート３がフロン
トプレート１と平行に設けられており、両プレート１，
３の間には一対の同一のボールねじ軸４，４が軸受１
ａ，３ａに回転自在に支持されて設けられている。各ボ
ールねじ軸４の端部には同一径のプーリ５がそれぞれ取
り付けられている。1 to 3 show an embodiment of a suck back control device for an injection molding machine according to the present invention. In these drawings, reference numeral 1 is a front plate. A heating cylinder 2 is fixed to the front plate 1. A rear plate 3 is provided in parallel with the front plate 1 behind the front plate 1 (on the right side in FIG. 1).
A pair of identical ball screw shafts 4 and 4 are provided between the bearings 1 and 3.
It is rotatably supported by a and 3a. Pulleys 5 having the same diameter are attached to the ends of the ball screw shafts 4, respectively.
【０００８】リヤプレート３には移動用駆動装置である
サーボモータ（電動機）６が固定されており、該サーボ
モータ６の出力軸７に設けられた駆動プーリ８とプーリ
５，５の間にはエンドレスのタイミングベルト９が巻き
掛けられている。サーボモータ６は、駆動プーリ８とタ
イミングベルト９、及びプーリ５，５を介して、各ボー
ルねじ軸４，４を互いに同期して周方向に回転させる。A servo motor (electric motor) 6 which is a drive device for movement is fixed to the rear plate 3, and a drive pulley 8 provided on an output shaft 7 of the servo motor 6 and pulleys 5 and 5 are provided. An endless timing belt 9 is wrapped around. The servo motor 6 rotates the ball screw shafts 4 and 4 in the circumferential direction in synchronization with each other via the drive pulley 8, the timing belt 9, and the pulleys 5 and 5.
【０００９】各ボールねじ軸４，４にはプレッシャプレ
ート（可動部材）１２がこれに固定した一対のボールナ
ット１１，１１を各ボールねじ軸４，４に螺着して支持
されている。プレッシャプレート１２は各ボールねじ軸
４，４が回転すると、各ボールナット１１，１１と一緒
に前後方向（図１で左右方向）に移動する。プレッシャ
プレート１２の加熱筒２側の前面には、軸受ハウジング
１３がロードセル等の圧力センサ１４を介して取り付け
られている。A pressure plate (movable member) 12 is supported on each of the ball screw shafts 4, 4 by screwing a pair of ball nuts 11, 11 fixed thereto. When the ball screw shafts 4 and 4 rotate, the pressure plate 12 moves in the front-rear direction (left-right direction in FIG. 1) together with the ball nuts 11 and 11. A bearing housing 13 is attached to the front surface of the pressure plate 12 on the heating cylinder 2 side via a pressure sensor 14 such as a load cell.
【００１０】軸受ハウジング１３には軸受１５が設けら
れ、該軸受１５には回転軸１６が回転自在に支持されて
いる。回転軸１６には射出スクリュ１７が取り付けられ
ている。射出スクリュ１７は加熱筒２に挿入されてお
り、プレッシャプレート１２と一緒に軸方向に移動し、
また図示されていない電動モータ（回転用駆動装置）に
よってプーリ１９を介して周方向に回転させられる。サ
ーボモータ６にはパルスエンコーダ等の位置センサ１８
が設けられている。A bearing 15 is provided in the bearing housing 13, and a rotary shaft 16 is rotatably supported by the bearing 15. An injection screw 17 is attached to the rotating shaft 16. The injection screw 17 is inserted in the heating cylinder 2 and moves in the axial direction together with the pressure plate 12,
Further, it is rotated in the circumferential direction via a pulley 19 by an electric motor (rotational driving device) not shown. The servo motor 6 includes a position sensor 18 such as a pulse encoder.
Is provided.
【００１１】また符号２１はサーボモータ制御回路であ
る。サーボモータ制御回路２１は、サーボモータ出力回
路２２を介してサーボモータ６の回転を制御するもので
あり、これにはシーケンス回路２３と比較器２４、速度
指令回路２５、及び速度検出回路２６がそれぞれ接続さ
れている。シーケンス回路２３はサーボモータ制御回路
２１にサックバック指令を出力する。Reference numeral 21 is a servo motor control circuit. The servo motor control circuit 21 controls the rotation of the servo motor 6 via a servo motor output circuit 22, which includes a sequence circuit 23, a comparator 24, a speed command circuit 25, and a speed detection circuit 26, respectively. It is connected. The sequence circuit 23 outputs a suck back command to the servo motor control circuit 21.
【００１２】比較器２４には係数乗算器２８と目標値設
定器２９が接続されている。係数乗算器２８はロードセ
ル入力回路３０を介して入力される圧力センサ１４の検
出圧力に、係数設定器３１に設定された係数を掛けるこ
とによって得られた圧力Ｆを比較器２４に出力する。圧
力センサ１４は通常ロードセルを使用するので、この検
出荷重に係数としてスクリュ断面積の逆数を乗じて圧力
値に変換する。比較器２４は、目標値設定器２９に予め
設定された圧力の目標値Ｆ1 と上記圧力Ｆとを比較し、
圧力Ｆが目標値Ｆ1 よりも低くなった場合にサーボモー
タ制御回路２１に停止指令を出力して射出スクリュ１７
のサックバックを停止させる。A coefficient multiplier 28 and a target value setter 29 are connected to the comparator 24. The coefficient multiplier 28 outputs the pressure F obtained by multiplying the pressure detected by the pressure sensor 14 input via the load cell input circuit 30 by the coefficient set in the coefficient setter 31 to the comparator 24. Since the pressure sensor 14 normally uses a load cell, this detected load is converted into a pressure value by multiplying the detected load by the reciprocal of the screw cross-sectional area. The comparator 24 compares the target value F 1 of pressure preset in the target value setter 29 with the pressure F,
When the pressure F becomes lower than the target value F 1 , a stop command is output to the servo motor control circuit 21 and the injection screw 17
Stop suck back.
【００１３】速度指令回路２５には、サーボモータ制御
回路２１のほかに、スクリュ位置検出回路３２と位置比
較器３３、及び速度設定器３４が接続されている。スク
リュ位置検出回路３２は、位置センサ１８から出力され
る信号をエンコーダ入力回路３５を介して受け、射出ス
クリュ１７の移動ストロークＳとして速度指令回路２５
と位置比較器３３に出力する。位置比較器３３は、位置
検出回路３２から出力されたストロークＳと位置設定器
３６に予め設定された射出スクリュ１７のストローク位
置Ｓ1 ，Ｓ2 とを比較し、射出スクリュ１７のストロー
クＳが各設定位置Ｓ1 ，Ｓ2 をこえた場合に速度指令回
路２５に切換信号を出力する。In addition to the servo motor control circuit 21, a screw position detection circuit 32, a position comparator 33, and a speed setting device 34 are connected to the speed command circuit 25. The screw position detection circuit 32 receives the signal output from the position sensor 18 via the encoder input circuit 35, and outputs it as the moving stroke S of the injection screw 17 to the speed command circuit 25.
To the position comparator 33. The position comparator 33 compares the stroke S output from the position detection circuit 32 with the stroke positions S 1 and S 2 of the injection screw 17 which are preset in the position setter 36, and the stroke S of the injection screw 17 is different from each other. If the set positions S 1 and S 2 are exceeded, a switching signal is output to the speed command circuit 25.
【００１４】速度指令回路２５は、位置比較器３３から
切換信号が出力されると、速度指令Ｖをサーボモータ制
御回路２１に出力し、速度設定器３４に予め設定され
た、上記切換信号に対応する速度Ｖ2 ，Ｖ3 で射出スク
リュ１７をサックバックさせる（図２参照）。なお、図
２のＦ0 は樹脂の計量完了時における圧力センサ１４の
値である。When the switching signal is output from the position comparator 33, the speed command circuit 25 outputs the speed command V to the servo motor control circuit 21 to correspond to the switching signal previously set in the speed setter 34. The injection screw 17 is sucked back at the speeds V 2 and V 3 (see FIG. 2). It should be noted that F 0 in FIG. 2 is the value of the pressure sensor 14 at the time when the resin measurement is completed.
【００１５】上記において、射出スクリュ１７のサック
バック速度Ｖ1 ，Ｖ2 ，Ｖ3 の大きさは、Ｖ1 ＞Ｖ2 ＞
Ｖ3 とされる。この理由は次の通りである。すなわち、
射出スクリュ１７の先端に作用する力をＦ′とし、また
射出スクリュ１７にかかる摩擦力や剪断力等の抵抗をＦ
L とすると、次の式（１）が成立する。 Ｆ＝Ｆ′−ＦL … （１） ここで抵抗ＦL は射出スクリュ１７の後退速度が低い程
ゼロに近づくため、Ｆ≒Ｆ′となって圧力センサ１４の
検出精度が向上することが上記の理由である。In the above, the suck back speeds V 1 , V 2 and V 3 of the injection screw 17 are V 1 > V 2 >.
It is a V 3. The reason for this is as follows. That is,
The force acting on the tip of the injection screw 17 is F ′, and the resistance of the injection screw 17 such as frictional force and shearing force is F ′.
When L , the following equation (1) is established. F = F'-F L ... ( 1) where the resistance F L is to approach zero as low retracting speed of the injection screw 17, the may improve detection accuracy of the pressure sensor 14 becomes F ≒ F ' Is the reason.
【００１６】次に上記のように構成された本発明に係る
射出成形機のサックバック制御装置の作用を説明する。
シーケンス回路２３は、計量工程が完了すると、直ちに
サックバック指令をサーボモータ制御回路２１に出力す
る（図３のステップＳ１）。サーボモータ制御回路２１
はサックバック指令が出ると、射出スクリュ１７が速度
Ｖ1 で後退するようにサーボモータ出力回路２２を介し
てサーボモータ６を制御する。この際、圧力センサ１４
は検出信号をロードセル入力回路３０を介して係数乗算
器２８に出力し（ステップＳ２）、また位置センサ１８
は検出信号をエンコーダ入力回路３５を介して速度検出
回路２６とスクリュ位置検出回路３２に出力する。Next, the operation of the suck-back control device of the injection molding machine according to the present invention having the above structure will be described.
Upon completion of the weighing process, the sequence circuit 23 immediately outputs a suck back command to the servo motor control circuit 21 (step S1 in FIG. 3). Servo motor control circuit 21
When the suck back command is issued, controls the servo motor 6 via the servo motor output circuit 22 so that the injection screw 17 retracts at the speed V 1 . At this time, the pressure sensor 14
Outputs the detection signal to the coefficient multiplier 28 via the load cell input circuit 30 (step S2), and the position sensor 18
Outputs a detection signal to the speed detection circuit 26 and the screw position detection circuit 32 via the encoder input circuit 35.
【００１７】係数乗算器２８は係数設定器３１に設定さ
れた係数をロードセル入力回路３０からの入力信号に掛
けてこれを比較器２４に出力する。比較器２４は係数乗
算器２８の出力値Ｆと目標設定器２９に設定された目標
値Ｆ1 とを比較する（ステップＳ３）。The coefficient multiplier 28 multiplies the coefficient set in the coefficient setter 31 by the input signal from the load cell input circuit 30 and outputs it to the comparator 24. The comparator 24 compares the output value F of the coefficient multiplier 28 with the target value F 1 set in the target setting unit 29 (step S3).
【００１８】一方、速度検出回路２６はエンコーダ入力
回路３５の信号を速度のフィードバック信号としてサー
ボモータ制御回路２１に出力し、また、スクリュ位置検
出回路３２は、射出スクリュ１７のストローク信号とし
て速度指令回路２５と位置比較器３３に出力する。On the other hand, the speed detection circuit 26 outputs the signal of the encoder input circuit 35 to the servo motor control circuit 21 as a speed feedback signal, and the screw position detection circuit 32 outputs the speed command circuit as a stroke signal of the injection screw 17. 25 and the position comparator 33.
【００１９】位置比較器３３はスクリュ位置検出回路３
２の出力値Ｓと位置設定器３６に設定された設定値Ｓ1
とを比較し、位置検出回路３２の出力値Ｓが設定値Ｓ1
をこえた場合に切換信号を速度指令回路２５に出力す
る。速度指令回路２５は切換信号を受けると、該切換信
号に対応する設定速度Ｖ2 の速度指令をサーボモータ制
御回路に出力し、これによりサーボモータ制御回路２１
は射出スクリュ１７が速度Ｖ2 で後退するようにサーボ
モータ６を制御する。The position comparator 33 is a screw position detection circuit 3
2 output value S and the set value S 1 set in the position setter 36
And the output value S of the position detection circuit 32 is compared with the set value S 1
When the value exceeds the limit, a switching signal is output to the speed command circuit 25. When the speed command circuit 25 receives the switching signal, the speed command circuit 25 outputs a speed command of the set speed V 2 corresponding to the switching signal to the servo motor control circuit, and thereby the servo motor control circuit 21.
Controls the servomotor 6 so that the injection screw 17 retracts at the speed V 2 .
【００２０】位置比較器３３は切換信号を出し終ると、
今度は位置検出回路３２の出力値Ｓと位置設定器３６の
次の設定値Ｓ2 を比較し、出力値Ｓが設定値Ｓ2 をこえ
ると再び切換信号を出力する。位置比較器３３から２回
目の切換信号が出されると、速度指令回路２５は速度指
令値Ｖ3 を出力し、サーボモータ制御回路２１が射出ス
クリュ１７が速度Ｖ3 で後退するようにサーボモータ６
を制御する。When the position comparator 33 finishes issuing the switching signal,
This time, the output value S of the position detection circuit 32 is compared with the next set value S 2 of the position setter 36, and when the output value S exceeds the set value S 2 , the switching signal is output again. When the second switching signal is issued from the position comparator 33, the speed command circuit 25 outputs the speed command value V 3 , and the servo motor control circuit 21 causes the servo motor 6 to move the injection screw 17 backward at the speed V 3.
To control.
【００２１】射出スクリュ１７の後退ストロークが増大
してくると、係数乗算器２８の出力値Ｆが目標値Ｆ1 に
近くなり、出力値Ｆが目標値Ｆ1 よりも小さくなると
（ステップＳ３のＹＥＳ）比較器２４からサーボモータ
制御回路２１に停止指令が出され、サーボモータ６が停
止して（ステップＳ４）射出スクリュ１７のサックバッ
クが終了する。When the backward stroke of the injection screw 17 increases, the output value F of the coefficient multiplier 28 approaches the target value F 1 and the output value F becomes smaller than the target value F 1 (YES in step S3). ) A stop command is issued from the comparator 24 to the servo motor control circuit 21, the servo motor 6 stops (step S4), and suck back of the injection screw 17 ends.
【００２２】図４は本発明の第２実施例を示す。この実
施例では、速度指令回路２５に、速度設定器３７等のほ
かに次速度補正器３８が接続され、また次速度補正器３
８には速度設定器３４と補正値の設定器３９が接続され
ている。次速度補正器３８は速度設定器３７に設定され
た初速Ｖ1 を設定器３９に設定された補正値で補正して
次速Ｖ2 と終速Ｖ3 を速度指令回路２５に出力する。補
正方法としては、初速Ｖ1 から補正値ΔＶ2 、または補
正値ΔＶ3 を減じてＶ2 ，Ｖ3 とする方法、或いは初速
Ｖ1 に補正値ａ1 、または補正値ａ2 を掛けて（或いは
割って）Ｖ2 ，Ｖ3 とする方法があるがいずれでもよ
い。いずれの場合も前記の理由でＶ1 ＞Ｖ2 ＞Ｖ3 とす
る。他の構成は図１のものと同じである。ΔＶ2 とΔＶ
3 は同一値とすることができる。FIG. 4 shows a second embodiment of the present invention. In this embodiment, the next speed compensator 38 is connected to the speed command circuit 25 in addition to the speed setter 37 and the like.
A speed setter 34 and a correction value setter 39 are connected to the unit 8. The next speed corrector 38 corrects the initial speed V 1 set in the speed setter 37 with the correction value set in the setter 39 and outputs the next speed V 2 and the final speed V 3 to the speed command circuit 25. As the correction method, the correction value ΔV 2 or the correction value ΔV 3 is subtracted from the initial speed V 1 to obtain V 2 and V 3 , or the initial speed V 1 is multiplied by the correction value a 1 or the correction value a 2 ( Alternatively, there is a method of dividing it into V 2 and V 3 , but either method is acceptable. In any case, V 1 > V 2 > V 3 is set for the above reason. Other configurations are the same as those in FIG. ΔV 2 and ΔV
3 can be the same value.
【００２３】上記二つの実施例では、いずれも射出スク
リュ１７の変速段数は三段とされているが、二段、或い
は四段以上でもよい。In both of the above-mentioned two embodiments, the number of gears of the injection screw 17 is three, but it may be two, four or more.
【００２４】また、図５は本発明の第３実施例を示す。
この実施例では初速Ｖ1 と終速（最小値）Ｖmin を設定
する速度設定器４１が速度指令回路２５に接続され、速
度指令回路２５は上記設定値Ｖ1 ，Ｖmin からストロー
クのｎ次関数の演算を行って射出スクリュ１７を減速さ
せる（図７参照）構成とされている。FIG. 5 shows a third embodiment of the present invention.
In this embodiment, a speed setter 41 for setting an initial speed V 1 and a final speed (minimum value) V min is connected to the speed command circuit 25, and the speed command circuit 25 uses the above set values V 1 and V min for the nth stroke. The configuration is such that a function is calculated to decelerate the injection screw 17 (see FIG. 7).
【００２５】更に、図６は本発明の第４実施例を示す。
この実施例では、速度設定器４１と時間計測回路４２が
速度指令回路２５に接続され、速度指令回路２５は速度
設定器４１に設定された初速Ｖ1 と終速Ｖmin から時間
のｎ次関数の演算を行って射出スクリュ１７を減速させ
る（図７参照）。Further, FIG. 6 shows a fourth embodiment of the present invention.
In this embodiment, a speed setter 41 and a time measuring circuit 42 are connected to a speed command circuit 25, and the speed command circuit 25 uses an n-th order function of time from the initial speed V 1 and the final speed V min set in the speed setter 41. Then, the injection screw 17 is decelerated (see FIG. 7).
【００２６】図５と図６のサックバック制御装置におい
ては、終速Ｖmin に達する前に検出値Ｆが目標値Ｆ1 に
達した時はその時点でサックバックは終了とする。また
図５と図６のサックバック制御装置の他の構成は、位置
比較器３３（図１）と位置設定器３６が不要で省かれる
以外図１のものと同じである。In the suck back control device of FIGS. 5 and 6, when the detected value F reaches the target value F 1 before reaching the final speed V min , the suck back ends at that time. The other configurations of the suck back control device of FIGS. 5 and 6 are the same as those of FIG. 1 except that the position comparator 33 (FIG. 1) and the position setter 36 are unnecessary and omitted.
【００２７】圧力センサ１４は、射出力（圧力）や背圧
力の計測用として設備されたものをそのまま用いること
ができる。上記実施例の射出成形機は電動式であるが、
本発明はこれに限らず油圧式の射出成形機にも実施する
ことができる。この場合は、射出スクリュとこれを動か
す油圧シリンダ（移動用駆動装置）との間に圧力センサ
を設け、油圧シリンダの速度制御によりサックバック制
御を行う。また、射出スクリュ１７は減速させずに後退
させてもよい。The pressure sensor 14 can be used as it is, which is provided for measuring the injection output (pressure) and the back pressure. The injection molding machine of the above embodiment is an electric type,
The present invention is not limited to this, and can be implemented in a hydraulic injection molding machine. In this case, a pressure sensor is provided between the injection screw and a hydraulic cylinder (moving drive device) that moves the injection screw, and suck back control is performed by speed control of the hydraulic cylinder. Further, the injection screw 17 may be retracted without decelerating.
【００２８】[0028]
【発明の効果】以上説明したように、本発明に係る射出
成形機のサックバック制御装置は、移動用駆動装置によ
って動かされる可動部材と該可動部材によって加熱筒に
対して移動させられる射出スクリュとの間に設けられた
圧力センサと、上記移動用駆動装置の制御回路と、移動
用駆動装置による射出スクリュのサックバック完了時に
おける圧力の目標値を設定する目標値設定器と、上記圧
力センサで検出された圧力と目標値設定器に設定された
圧力とを比較し、圧力センサの検出圧力と目標値設定器
に設定された目標値との関係が所定の関係となった場合
に上記制御回路に停止指令を出力して射出スクリュのサ
ックバックを停止させる比較器と、射出スクリュのサッ
クバック時に上記制御回路に射出スクリュの速度指令を
出力する速度指令回路とを具備した構成とされているの
で、加熱筒内の計量樹脂の圧力が負圧にならない所定値
以下に保たれて、射出ノズルからの樹脂漏れを確実に防
止することができるうえ、加熱筒に孔をあけて圧力セン
サをわざわざ取り付ける必要がなく、射出力や背圧計測
用の圧力センサをそのまま利用することができる。ま
た、圧力センサは射出ノズルの近くに設けられておら
ず、固定盤と干渉することがない。したがって固定盤等
の設計自由度が制限されることがない。更にまた、圧力
センサは溶融樹脂に直接接触することはなく、加熱筒か
ら離れていて高温に加熱されることもないので、長期間
にわたって最良の状態で精度よく使用することができ
る。As described above, the suckback control device for an injection molding machine according to the present invention includes a movable member that is moved by a moving drive device and an injection screw that is moved by the movable member with respect to a heating cylinder. A pressure sensor provided between, a control circuit of the moving drive device, a target value setting device for setting a target value of pressure when suck back of the injection screw by the moving drive device is completed, and the pressure sensor. The control circuit compares the detected pressure with the pressure set in the target value setting device, and when the relation between the pressure detected by the pressure sensor and the target value set in the target value setting device is a predetermined relation, Comparator that outputs a stop command to stop the suck back of the injection screw, and a speed command that outputs the speed command of the injection screw to the control circuit at the time of suck back of the injection screw. Since it is configured to include a passage, the pressure of the measuring resin in the heating cylinder is maintained below a predetermined value that does not become a negative pressure, and it is possible to reliably prevent resin leakage from the injection nozzle and to heat the resin. It is not necessary to purposely attach the pressure sensor by making a hole in the cylinder, and the pressure sensor for measuring the ejection force and the back pressure can be used as it is. Further, since the pressure sensor is not provided near the injection nozzle, it does not interfere with the fixed platen. Therefore, the degree of freedom in designing the fixed plate is not limited. Furthermore, since the pressure sensor does not come into direct contact with the molten resin and is not separated from the heating cylinder and is not heated to a high temperature, it can be accurately used in the best condition for a long period of time.
【図１】 本発明に係る射出成形機のサックバック制御
装置の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a suck back control device for an injection molding machine according to the present invention.
【図２】 射出スクリュの後退ストロークと圧力及び速
度の関係を示す制御図である。FIG. 2 is a control diagram showing the relationship between the backward stroke of the injection screw and the pressure and speed.
【図３】 サックバック制御のフロー図である。FIG. 3 is a flowchart of suck back control.
【図４】 本発明の第２実施例の要部のブロック図であ
る。FIG. 4 is a block diagram of an essential part of a second embodiment of the present invention.
【図５】 本発明の第３実施例の要部のブロック図であ
る。FIG. 5 is a block diagram of an essential part of a third embodiment of the present invention.
【図６】 本発明の第４実施例の要部のブロック図であ
る。FIG. 6 is a block diagram of an essential part of a fourth embodiment of the present invention.
【図７】 本発明の第３及び第４実施例における射出ス
クリュの後退ストロークと圧力及び速度の関係を示す制
御図である。FIG. 7 is a control diagram showing the relationship between the backward stroke of the injection screw and the pressure and speed in the third and fourth embodiments of the present invention.
６ サーボモータ（移動用駆動装置） １２ プレッシャプレート（可動部材） １４ 圧力センサ １７ 射出スクリュ ２１ 制御回路 ２４ 比較器 ２５ 速度指令回路 ２９ 目標値設定器 6 Servo Motor (Moving Drive Device) 12 Pressure Plate (Movable Member) 14 Pressure Sensor 17 Injection Screw 21 Control Circuit 24 Comparator 25 Speed Command Circuit 29 Target Value Setting Device
Claims (1)
部材と該可動部材によって加熱筒に対して移動させられ
る射出スクリュとの間に設けられた圧力センサと、上記
移動用駆動装置の制御回路と、移動用駆動装置による射
出スクリュのサックバック完了時における圧力の目標値
を設定する目標値設定器と、上記圧力センサで検出され
た圧力と目標値設定器に設定された圧力とを比較し、圧
力センサの検出圧力と目標値設定器に設定された目標値
との関係が所定の関係となった場合に上記制御回路に停
止指令を出力して射出スクリュのサックバックを停止さ
せる比較器と、射出スクリュのサックバック時に上記制
御回路に射出スクリュの速度指令を出力する速度指令回
路とを具備したことを特徴とする射出成形機のサックバ
ック制御装置。1. A pressure sensor provided between a movable member moved by a moving drive device and an injection screw moved by the movable member with respect to a heating cylinder, and a control circuit of the moving drive device. The target value setter that sets the target value of the pressure when the sucking back of the injection screw by the moving drive device is completed is compared with the pressure detected by the pressure sensor and the pressure set in the target value setter, and the pressure is compared. When the relationship between the detected pressure of the sensor and the target value set in the target value setting device becomes a predetermined relationship, a stop command is output to the above control circuit to stop the suck back of the injection screw, and the injection A suck back control device for an injection molding machine, comprising: a speed command circuit for outputting a speed command of an injection screw to the control circuit when the screw is sucked back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4228979A JPH0741652B2 (en) | 1992-08-27 | 1992-08-27 | Suck-back control method and apparatus for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4228979A JPH0741652B2 (en) | 1992-08-27 | 1992-08-27 | Suck-back control method and apparatus for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0671705A true JPH0671705A (en) | 1994-03-15 |
| JPH0741652B2 JPH0741652B2 (en) | 1995-05-10 |
Family
ID=16884872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4228979A Expired - Fee Related JPH0741652B2 (en) | 1992-08-27 | 1992-08-27 | Suck-back control method and apparatus for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741652B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006272573A (en) * | 2005-03-28 | 2006-10-12 | Nissei Plastics Ind Co | Method for monitoring action of injection molding machine |
| EP2002960A1 (en) | 2007-06-11 | 2008-12-17 | Fanuc Ltd | Injection molding machine |
| CN111605130A (en) * | 2019-02-22 | 2020-09-01 | 东和株式会社 | Resin molding apparatus and method for manufacturing resin molded product |
| CN112536996A (en) * | 2019-09-20 | 2021-03-23 | 发那科株式会社 | Control device and control method for injection molding machine |
| JP2021091155A (en) * | 2019-12-11 | 2021-06-17 | ファナック株式会社 | Control device and control method for injection molding machine |
| JP2021160245A (en) * | 2020-03-31 | 2021-10-11 | 住友重機械工業株式会社 | Injection molding machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6177712B2 (en) * | 2014-02-28 | 2017-08-09 | 住友重機械工業株式会社 | Injection molding machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6297818A (en) * | 1985-10-25 | 1987-05-07 | Fanuc Ltd | Resin pressure detector in injection molder |
| JPH01148526A (en) * | 1987-12-07 | 1989-06-09 | Toyo Mach & Metal Co Ltd | Device for controlling suck-back of injection molder |
-
1992
- 1992-08-27 JP JP4228979A patent/JPH0741652B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6297818A (en) * | 1985-10-25 | 1987-05-07 | Fanuc Ltd | Resin pressure detector in injection molder |
| JPH01148526A (en) * | 1987-12-07 | 1989-06-09 | Toyo Mach & Metal Co Ltd | Device for controlling suck-back of injection molder |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006272573A (en) * | 2005-03-28 | 2006-10-12 | Nissei Plastics Ind Co | Method for monitoring action of injection molding machine |
| EP2002960A1 (en) | 2007-06-11 | 2008-12-17 | Fanuc Ltd | Injection molding machine |
| US7806675B2 (en) | 2007-06-11 | 2010-10-05 | Fanuc Ltd | Injection molding machine with resin pressure gradient detection |
| CN111605130A (en) * | 2019-02-22 | 2020-09-01 | 东和株式会社 | Resin molding apparatus and method for manufacturing resin molded product |
| KR20200102921A (en) * | 2019-02-22 | 2020-09-01 | 토와 가부시기가이샤 | Resin molding device and method for manufacturing resin-molded product |
| CN111605130B (en) * | 2019-02-22 | 2022-03-04 | 东和株式会社 | Resin molding apparatus and method for manufacturing resin molded product |
| CN112536996A (en) * | 2019-09-20 | 2021-03-23 | 发那科株式会社 | Control device and control method for injection molding machine |
| JP2021045945A (en) * | 2019-09-20 | 2021-03-25 | ファナック株式会社 | Control device and control method for injection molding machine |
| JP2021091155A (en) * | 2019-12-11 | 2021-06-17 | ファナック株式会社 | Control device and control method for injection molding machine |
| JP2021160245A (en) * | 2020-03-31 | 2021-10-11 | 住友重機械工業株式会社 | Injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0741652B2 (en) | 1995-05-10 |
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