JPH0460810B2 - - Google Patents

Info

Publication number
JPH0460810B2
JPH0460810B2 JP30773987A JP30773987A JPH0460810B2 JP H0460810 B2 JPH0460810 B2 JP H0460810B2 JP 30773987 A JP30773987 A JP 30773987A JP 30773987 A JP30773987 A JP 30773987A JP H0460810 B2 JPH0460810 B2 JP H0460810B2
Authority
JP
Japan
Prior art keywords
tip
molten resin
heating cylinder
injection
pressure
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
Application number
JP30773987A
Other languages
Japanese (ja)
Other versions
JPH01148526A (en
Inventor
Yosha Taniguchi
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.)
Toyo Machinery and Metal Co Ltd
Original Assignee
Toyo Machinery and Metal Co 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 Toyo Machinery and Metal Co Ltd filed Critical Toyo Machinery and Metal Co Ltd
Priority to JP30773987A priority Critical patent/JPH01148526A/en
Publication of JPH01148526A publication Critical patent/JPH01148526A/en
Publication of JPH0460810B2 publication Critical patent/JPH0460810B2/ja
Granted 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
    • 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
    • B29C2945/76003—Measured parameter
    • B29C2945/76083—Position
    • 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
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/7619—Injection unit barrel
    • B29C2945/76193—Injection unit barrel barrel-chamber
    • 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
    • B29C2945/76568—Position
    • 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
    • B29C2945/76665—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
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • B29C2945/76692—Injection unit drive means

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】[Detailed description of the invention]

〔産業上の利用分野〕 本発明は、射出成形機の計量工程の完了後行う
サツクバツク動作を制御する装置の改良に関す
る。 〔発明の背景〕 射出成形機の計量工程の完了後行うサツクバツ
ク操作の目的は、計量完了時点において、加熱シ
リンダの先端内部に、計量動作中にピストン手段
の後退に対する抵抗としてかけられた背圧に相当
する溶融樹脂圧が残つているので、そのままにし
ておくと、射出工程に至るまでに溶融樹脂がノズ
ルからドルーリング（鼻たれ）する恐れがあるの
を防ぐためである。従来は計量完了位置からピス
トン手段を後退させるストローク、または計量完
了時点からピストン手段を後退させる微小時間を
設定して、機械的に一定ストロークまたは、一定
時間サツクバツク操作を行わせる制御を行つてい
た。 しかし上述の方法による制御では、サツクバツ
ク操作後の加熱シリンダの先端内部の溶融樹脂圧
は、第４図に示すように、かえつてバラツく結果
となり、溶融樹脂圧が高く残つた場合はドルーリ
ングの心配も残ることとなる。 〔本発明の目的〕 本発明は、上述のようなサツクバツク操作後
の、加熱シリンダの先端内部の溶融樹脂圧のバラ
ツキをなくし、次の射出開始に至るまでの間に、
溶融樹脂がノズルからドルーリング（鼻たれ）す
ることを完全に防ぐことを目的としている。 〔問題点を解決するための手段〕 前述の目的を達成するため、本発明は、先端部
に射出ノズルを配設した加熱シリンダと、該加熱
シリンダの先端部に溶融樹脂を供給する樹脂供給
手段と、前記加熱シリンダの先端部に供給された
溶融樹脂を前記射出ノズルを介して金型のキヤビ
テイ内に射出するピストン手段とを備えた射出成
形機において、加熱シリンダ先端部内部の溶融樹
脂の圧力を直接また間接的に測定する圧力センサ
を配置し、樹脂供給手段による計量工程を完了し
た後、計量完了時の溶融樹脂圧が、予め設定した
一定値に降下するまで、ピストン手段を後退させ
るように制御されることを特徴とするものであ
る。 〔実施例〕 本発明の実施例を図とともに説明する。 第１図はモータ駆動方式の射出装置における実
施例である。図において１は射出成形機の装置本
体で、射出スクリユー２を回転並びに前後摺動自
在に内装した加熱シリンダ３を一体に突設してあ
り、この加熱シリンダ３の後端上周部に加熱シリ
ンダ３内に原料樹脂を供給するホツパー４を取付
けてある。５は加熱シリンダ３の先端ノズルであ
る。 ６は射出用サーボモータで、その回転軸６ａに
固着した歯車７を、前記射出スクリユー２の後端
にベアリング８を介して接続した螺軸９に螺合し
ている歯車１０に噛合させてある。 １１は射出スクリユー２の後端軸部２ａにスラ
イドキー１２を介して取付けたスクリユー回転駆
動歯車で、駆動モータ１３の回転軸に固着した歯
車１４に噛合してある。 １５は射出ノズル５の近傍部における加熱シリ
ンダ３の先端部に埋設した樹脂圧測定センサー
で、その検知部を加熱シリンダ３の先端内部に臨
ませてあり、このセンサー１５を制御装置１６を
介して前記射出用サーボモータ６に電気的に接続
してある。 １７はスクリユー位置を測定する位置センサ
で、ピストン手段に固着させたブラケツト１８及
びラツク１９、ラツク螺合したピニオン２０によ
つて、ピニオンと同軸に回動させられるように構
成されている。 制御装置１６は第２図に示すように、マイクロ
コンピユータ２１を主体として、樹脂圧検出用セ
ンサ１５の入力用アナログ→デジタル（Ａ／Ｄ）
変換機２２と、スクリユー位置を測定する位置セ
ンサ１７の入力用アナログ→デジタル（Ａ／Ｄ）
変換機２３と、前記射出用サーボモータ６を駆動
するためのアンプ２４、及び該アンプに指令を出
すデジタル→アナログ（Ｄ／Ａ）変換機２５と、
計量時の樹脂圧を設定する計量樹脂圧設定器２
６、計量完了位置を設定する計量完了位置設定器
２７、サツクバツク完了時の樹脂圧を設定するサ
ツクバツク完了樹脂圧設定器２８を接続して成る
ものである。 ２９，３０は移動、固定金型で、ノズル５を介
して射出された溶融樹脂は、この金型間に形成さ
れたキヤビテイ３１に充填される。 以上のように構成された本実施例ではスクリユ
ー回転駆動モータ１３を回転駆動すると、歯車１
１，１４を介して射出スクリユー２が回転し、ホ
ツパー４に投入した原料樹脂が該スクリユー２の
回転によりヒータで加熱される加熱シリンダ３内
で溶融状態となつて先端部Ａに送られ、該部Ａに
溜り計量工程を行う。溜つた溶融樹脂は射出用サ
ーボモータ６の回転駆動によつて歯車１０を回転
させることにより、螺軸９を介してスクリユー２
を前進させ、溶融樹脂を先端ノズル８から金型２
９，３０間のキヤビテイ３１内に圧入する射出工
程を行う。 上述の計量工程において、スクリユー２の回転
により先端部に溜る可塑化工程の溶融樹脂の圧力
（背圧）をセンサー１５により検出し、その入力
をＡ／Ｄ変換器２２で読み取つた値を、計量樹脂
圧設定器２６による設定値と比較し、その差が０
になるように、射出サーボモータ６によるスクリ
ユー２の後退速度をフイードバツク制御して計量
工程を行う。 同時に、スクリユー２の後退位置を位置センサ
１７で測定し、その入力をＡ／Ｄ変換器２３で読
み取つた値を、計量完了位置設定器２７による設
定値と比較し、その差が０になつた時にスクリユ
ー回転駆動モータ１３を停止させ、同時に射出サ
ーボモータ６によるスクリユー２の後退操作計量
を停止する。 その後直ちに、再び射出サーボモータ６による
スクリユー２を後退させるサツクバツク操作に移
るが、そのときスクリユー先端の溶融樹脂は、計
量完了時の圧力より降下し始める。その溶融樹脂
圧力を再びセンサー１５によつて検出し、その入
力をＡ／Ｄ変換器２２によつて読み取つた値を、
サツクバツク完了樹脂圧設定器２８による設定値
と比較し、その差が０になるまで、ピストン手段
を後退させるサツクバツク操作を行わせた後、停
止させる。 下記の表は本発明を組み込んだ試験機による事
例データである。 [Industrial Field of Application] The present invention relates to an improvement in a device for controlling the back-up operation of an injection molding machine after completion of a metering process. [Background of the Invention] The purpose of the back-back operation performed after the completion of the metering process of an injection molding machine is to apply back pressure inside the tip of the heating cylinder at the time of completion of metering to the back pressure applied as resistance to the retreat of the piston means during the metering operation. This is to prevent the molten resin from drooling from the nozzle if left as it is since the corresponding molten resin pressure remains. Conventionally, a stroke for retracting the piston means from the metering completion position, or a minute time for retracting the piston means from the point at which metering is completed, was set to mechanically control the piston to perform a constant stroke or a backward operation for a constant period of time. . However, with the control method described above, the molten resin pressure inside the tip of the heating cylinder after the sacback operation results in variations, as shown in Figure 4, and if the molten resin pressure remains high, the drue ring Concerns will remain. [Object of the present invention] The present invention eliminates variations in the molten resin pressure inside the tip of the heating cylinder after the above-mentioned back-back operation, and until the start of the next injection.
The purpose is to completely prevent molten resin from dripping from the nozzle. [Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a heating cylinder having an injection nozzle at its tip, and a resin supply means for supplying molten resin to the tip of the heating cylinder. and piston means for injecting the molten resin supplied to the tip of the heating cylinder into the cavity of the mold via the injection nozzle, the pressure of the molten resin inside the tip of the heating cylinder is reduced. After the metering process by the resin supply means is completed, the piston means is retracted until the molten resin pressure at the time of completion of metering falls to a preset constant value. It is characterized by being controlled by. [Example] An example of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of a motor-driven injection device. In the figure, reference numeral 1 denotes the main body of the injection molding machine, which has an integrally protruding heating cylinder 3 in which an injection screw 2 is rotatable and slidable back and forth. A hopper 4 for supplying raw material resin is installed in the interior of the hopper 3. 5 is a tip nozzle of the heating cylinder 3. Reference numeral 6 designates an injection servo motor, and a gear 7 fixed to its rotating shaft 6a is meshed with a gear 10 that is threaded onto a screw shaft 9 connected to the rear end of the injection screw 2 via a bearing 8. . A screw rotation drive gear 11 is attached to the rear end shaft portion 2a of the injection screw 2 via a slide key 12, and is meshed with a gear 14 fixed to the rotation shaft of a drive motor 13. Reference numeral 15 denotes a resin pressure measuring sensor embedded in the tip of the heating cylinder 3 in the vicinity of the injection nozzle 5, with its detection part facing inside the tip of the heating cylinder 3. It is electrically connected to the injection servo motor 6. Reference numeral 17 denotes a position sensor for measuring the screw position, and is configured to be rotated coaxially with the pinion by a bracket 18 and a rack 19 fixed to the piston means, and a pinion 20 screwed into the rack. As shown in FIG. 2, the control device 16 is mainly composed of a microcomputer 21, and has analog to digital (A/D) input for the resin pressure detection sensor 15.
Analog to digital (A/D) input for the converter 22 and the position sensor 17 that measures the screw position
a converter 23, an amplifier 24 for driving the injection servo motor 6, and a digital to analog (D/A) converter 25 for issuing commands to the amplifier;
Metering resin pressure setting device 2 to set resin pressure during metering
6. A metering completion position setting device 27 for setting the metering completion position and a sac-back completion resin pressure setting device 28 for setting the resin pressure at the time of sac-back completion are connected. 29 and 30 are movable and fixed molds, and the molten resin injected through the nozzle 5 is filled into a cavity 31 formed between these molds. In this embodiment configured as above, when the screw rotation drive motor 13 is rotationally driven, the gear 1
The injection screw 2 rotates via the screws 1 and 14, and the raw material resin fed into the hopper 4 becomes molten in the heating cylinder 3, which is heated by a heater, and is sent to the tip A. Part A performs the pool weighing process. The accumulated molten resin is transferred to the screw 2 through the screw shaft 9 by rotating the gear 10 by the rotational drive of the injection servo motor 6.
is advanced, and the molten resin is passed from the tip nozzle 8 to the mold 2.
An injection process is performed to press fit into the cavity 31 between 9 and 30. In the above-mentioned measuring process, the pressure (back pressure) of the molten resin accumulated at the tip of the plasticizing process due to the rotation of the screw 2 is detected by the sensor 15, and the value read by the A/D converter 22 is measured. Compare with the value set by the resin pressure setting device 26 and find that the difference is 0.
The metering process is carried out by feedback controlling the retraction speed of the screw 2 by the injection servo motor 6 so that At the same time, the backward position of the screw 2 is measured by the position sensor 17, and the value read by the A/D converter 23 is compared with the value set by the metering completion position setting device 27, and the difference becomes 0. At the same time, the screw rotation drive motor 13 is stopped, and at the same time, the backward operation and metering of the screw 2 by the injection servo motor 6 is stopped. Immediately thereafter, the injection servo motor 6 moves back to the backward operation of the screw 2, but at this time the molten resin at the tip of the screw begins to drop below the pressure at the end of metering. The molten resin pressure is detected again by the sensor 15, and the value is read by the A/D converter 22.
Completion of back-back The piston means is compared with the setting value set by the resin pressure setting device 28, and a back-back operation is performed to retract the piston means until the difference becomes 0, and then the piston means is stopped. The table below provides example data from a test machine incorporating the present invention.

〔発明の効果〕〔Effect of the invention〕

以上のように本発明は、計量完了時の溶融樹脂
圧が、予め設定した一定値に降下するまで、ピス
トン手段を後退させて停止させるように制御され
るので、第３図に示すようにサツクバツク操作完
了後の、加熱シリンダの先端内部の溶融樹脂圧の
バラツキをなくすことができ、溶融樹脂がノズル
からドルーリング（鼻たれ）することを完全に防
ぐことができる。 更に、計量及びサツクバツクの全工程中、常に
加熱シリンダの先端内部の溶融樹脂圧が測定され
てフイードバツク制御が行われ、最終的にサツク
バツク完了後溶融樹脂圧が一定に確保されるの
で、加熱シリンダの先端内部に蓄えられる樹脂量
も、毎シヨツト均一になり、安定した射出量、従
つて安定した製品重量が確保され、超精密成形を
実現することができるのである。 As described above, in the present invention, the piston means is controlled to retreat and stop until the molten resin pressure drops to a preset constant value at the time of completion of metering. It is possible to eliminate variations in the pressure of the molten resin inside the tip of the heating cylinder after the operation is completed, and it is possible to completely prevent the molten resin from drooling from the nozzle. Furthermore, during the entire weighing and suction process, the molten resin pressure inside the tip of the heating cylinder is constantly measured and feedback control is performed.Finally, after the suction is completed, the molten resin pressure is ensured at a constant level, so that the pressure of the heating cylinder is kept constant. The amount of resin stored inside the tip is also uniform for each shot, ensuring a stable injection amount and therefore a stable product weight, making it possible to achieve ultra-precision molding.

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

図面は本発明の一実施例を示すもので、第１図
は装置の縦断面図、第２図はサツクバツク制御装
置のブロツク図、第３図は本発明の制御による効
果を示す説明図、第４図は従来のサツクバツク制
御（サツクバツクストローク一定に設定する方
式）の場合の加熱シリンダ先端部内部の溶融樹脂
圧のバラツキを説明する図である。 ２……射出スクリユー（ピストン手段）、３…
…加熱シリンダ、６……射出サーボモータ、１３
……モータ（樹脂供給手段）、１５……樹脂圧検
出センサ、１６……制御装置、２１……マイクロ
コンピユータ、２６……計量時の樹脂圧設定器、
２８……サツクバツク完了時の樹脂圧設定器、Ａ
……加熱シリンダ先端内部。 The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view of the device, FIG. 2 is a block diagram of the back-back control device, FIG. 3 is an explanatory diagram showing the effects of the control of the present invention, and FIG. FIG. 4 is a diagram illustrating variations in the molten resin pressure inside the tip of the heating cylinder in the case of conventional suction control (a method in which the suction stroke is set constant). 2... Injection screw (piston means), 3...
...Heating cylinder, 6...Injection servo motor, 13
... Motor (resin supply means), 15 ... Resin pressure detection sensor, 16 ... Control device, 21 ... Microcomputer, 26 ... Resin pressure setting device during measurement,
28...Resin pressure setting device at the time of completion of suction, A
...Inside the tip of the heating cylinder.

Claims (1)

【特許請求の範囲】[Claims] １ 先端部に射出ノズルを配設した加熱シリンダ
と、該加熱シリンダの先端部に溶融樹脂を供給す
る樹脂供給手段と、前記加熱シリンダの先端部に
供給された溶融樹脂を前記射出ノズルを介して金
型のキヤビテイ内に射出するピストン手段とを備
えた射出成形機において、加熱シリンダ先端部内
部の溶融樹脂の圧力を測定する圧力センサを配置
し、樹脂供給手段による計量工程を完了した後、
計量完了時の溶融樹脂圧が予め設定した一定値に
降下するまで、ピストン手段を後退させるように
制御されることを特徴とする射出成形機のサツク
バツク制御装置。1. A heating cylinder with an injection nozzle disposed at its tip, a resin supply means for supplying molten resin to the tip of the heating cylinder, and a means for supplying molten resin to the tip of the heating cylinder through the injection nozzle. In an injection molding machine equipped with a piston means for injecting into the cavity of a mold, a pressure sensor is arranged to measure the pressure of the molten resin inside the tip of the heating cylinder, and after the measuring process by the resin supply means is completed,
A suction control device for an injection molding machine, characterized in that the piston means is controlled to retreat until the molten resin pressure at the time of completion of metering falls to a preset constant value.
JP30773987A 1987-12-07 1987-12-07 Device for controlling suck-back of injection molder Granted JPH01148526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30773987A JPH01148526A (en) 1987-12-07 1987-12-07 Device for controlling suck-back of injection molder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30773987A JPH01148526A (en) 1987-12-07 1987-12-07 Device for controlling suck-back of injection molder

Publications (2)

Publication Number Publication Date
JPH01148526A JPH01148526A (en) 1989-06-09
JPH0460810B2 true JPH0460810B2 (en) 1992-09-29

Family

ID=17972680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30773987A Granted JPH01148526A (en) 1987-12-07 1987-12-07 Device for controlling suck-back of injection molder

Country Status (1)

Country Link
JP (1) JPH01148526A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02204017A (en) * 1989-02-01 1990-08-14 Japan Steel Works Ltd:The Method and apparatus for controlling injection molder
JPH03178417A (en) * 1989-12-07 1991-08-02 Niigata Eng Co Ltd Method and apparatus for controlling metering and non-rotating retreating of motorized injection molder
JPH0547624Y2 (en) * 1990-07-24 1993-12-15
JPH0741652B2 (en) * 1992-08-27 1995-05-10 株式会社新潟鉄工所 Suck-back control method and apparatus for injection molding machine
AU4895199A (en) * 1998-07-23 2000-02-14 Baiyuan Lu The apparatus of injection molding rubber and plastic and the method thereof
JP4199286B1 (en) 2007-06-11 2008-12-17 ファナック株式会社 Injection molding machine
JP7396884B2 (en) * 2019-12-11 2023-12-12 ファナック株式会社 Injection molding machine control device and control method
DE112021006010T5 (en) 2020-11-16 2023-11-09 Fanuc Corporation Control device and control method

Also Published As

Publication number Publication date
JPH01148526A (en) 1989-06-09

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