JPH10217304A - Injection molder and injection molding method - Google Patents

Injection molder and injection molding method

Info

Publication number
JPH10217304A
JPH10217304A JP2041397A JP2041397A JPH10217304A JP H10217304 A JPH10217304 A JP H10217304A JP 2041397 A JP2041397 A JP 2041397A JP 2041397 A JP2041397 A JP 2041397A JP H10217304 A JPH10217304 A JP H10217304A
Authority
JP
Japan
Prior art keywords
injection
pressure
cylinder device
control
pressure control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2041397A
Other languages
Japanese (ja)
Inventor
Masakazu Ono
雅和 大野
Chuzo Shimizu
忠三 清水
Shinichi Onozuka
真一 小野塚
Osamu Nakazawa
修 中沢
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.)
Sankyo Kasei Co Ltd
Original Assignee
Sankyo Kasei 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 Sankyo Kasei Co Ltd filed Critical Sankyo Kasei Co Ltd
Priority to JP2041397A priority Critical patent/JPH10217304A/en
Publication of JPH10217304A publication Critical patent/JPH10217304A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/82—Hydraulic or pneumatic circuits
    • B29C2045/824—Accumulators

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To provide an epoch-making and highly serviceable injection molder and injection molding method, which enables high-precision measuring, and filling and injecting control/management, and can be easily applied to conventional structure. SOLUTION: A molten resin 3 is fed in a front zone of an injection driving body 2 such as an injection screw or an injection plunger in an injection cylinder 1. The injection driving body 2, which is moved backward by the molten resin 3 fed into the front zone, is ejected forward to inject the molten resin 3 from the front end of the injection cylinder 1 into a mold 4. And the injection driving body 2 is pressed forward to dwell pressure to the resin fed into the mold 4. An injection driving cylinder device 5 for ejecting and controlling the injection driving body 2 is provided with a pressure control cylinder device 6, which controls injection pressure by bearing the injection driving cylinder device 5 at a specified dwell pressure.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、射出成形機並びに
射出成形方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine and an injection molding method.

【０００２】[0002]

【従来の技術及び発明が解決しようとする課題】射出成
形機における射出制御方法は、充填工程と保圧工程に大
別し制御を行っているが、充填工程では、射出速度（例
えば、射出スクリューの突出速度）のみを制御し、射出
圧と時間には制限をかけているに過ぎない。2. Description of the Related Art In an injection control method in an injection molding machine, control is roughly divided into a filling step and a pressure-holding step. Only the injection speed and time are limited.

【０００３】また、保圧工程においては、圧力と時間を
制御しているものが一般的であるが、速度制御等は一般
的には行わない。In the pressure-holding step, pressure and time are generally controlled, but speed control and the like are not generally performed.

【０００４】更に、いずれの工程制御も一つのシリンダ
装置により制御している。Further, each process control is controlled by one cylinder device.

【０００５】従って、従来充填工程中においては、射出
速度のコントロールのみで、負荷発生による反抗圧力が
結果として発生しているだけで、圧力コントロールは行
われていない。Therefore, in the conventional filling process, only the control of the injection speed is performed, and only the reaction pressure due to the generation of the load is generated, but the pressure control is not performed.

【０００６】即ち、図３(1)に示すような反抗圧力（ピ
ーク圧力）が生じたときには、充填が完了したと判断し
て反抗圧力がこれ以上持続しないように瞬時に射出制御
から保圧制御に切り換えたり、また圧力解消させる圧力
限界制御を行うものはあるが、充填射出中に圧力コント
ロールを行うものはない。That is, when a reaction pressure (peak pressure) as shown in FIG. 3A is generated, it is determined that the filling is completed, and the injection control is instantaneously changed from the injection control to the pressure holding control so that the reaction pressure does not continue any more. Or pressure limit control for eliminating pressure, but no pressure control is performed during filling and injection.

【０００７】従って、従来のような一つのアクチェータ
で単なる射出速度制御を行なうのみでは、前記保圧切り
換えや圧力限界制御を行ってもキャビティー満杯時（充
填完了時）にピーク圧力が発生し易く、その結果バリ不
良，離型不良などが生じるおそれがある。Therefore, if the injection speed is simply controlled by a single actuator as in the prior art, a peak pressure is likely to be generated when the cavity is full (at the time of completion of filling) even if the pressure holding switching or the pressure limit control is performed. As a result, there is a possibility that a burr defect, a mold release defect or the like may occur.

【０００８】また、一方射出時には図３(1)に示すよう
にキャビティー構造や湯道構造或いは溶融樹脂の粘度な
どの樹脂特性などによって異なる圧力変化が生じるが、
従来は、前述のように圧力コントロールは行わないため
に、射出速度制御を行っていても精度の高い計量充填は
行えない。On the other hand, at the time of injection, as shown in FIG. 3A, different pressure changes occur due to the cavity structure, the runner structure, or the resin characteristics such as the viscosity of the molten resin.
Conventionally, since pressure control is not performed as described above, highly accurate metering and filling cannot be performed even if injection speed control is performed.

【０００９】即ち、射出前の正確な樹脂計量と射出速度
制御だけでは、精度の高い計量充填射出が行えないか
ら、バリ不良等の前記問題を生じるおそれもある。That is, accurate metering and injection control cannot be performed only by accurate resin metering and injection speed control before injection, so that the above-mentioned problems such as defective burrs may occur.

【００１０】従って、従来においてはキャビティー構造
や樹脂特性などに対応した計量・充填管理を良好に行え
ていない。[0010] Therefore, conventionally, it has not been possible to satisfactorily perform measurement and filling management corresponding to the cavity structure, resin characteristics, and the like.

【００１１】本発明は、このような問題点を従来の射出
制御構造或いは射出制御方法に見い出し、射出時の圧力
コントロールを簡単な構造或いは簡単な手法で実現する
ことで前記問題点が解決でき、精度の高い前記計量・充
填射出の制御・管理も可能となり、既存の構造にも容易
にに適用可能で実用性にも秀れた画期的な射出成形機並
びに射出成形方法を提供するものである。The present invention finds such a problem in a conventional injection control structure or injection control method, and can solve the problem by realizing pressure control at the time of injection by a simple structure or a simple method. It is also possible to control and manage the high-precision weighing / filling injection, and to provide a revolutionary injection molding machine and an injection molding method that can be easily applied to existing structures and have excellent practicality. is there.

【００１２】[0012]

【課題を解決するための手段】添付図面を参照して本発
明の要旨を説明する。The gist of the present invention will be described with reference to the accompanying drawings.

【００１３】射出シリンダ１内の射出スクリュー若しく
は射出プランジャーなどの射出駆動体２の前部に溶融樹
脂３を送り込み、この前部に送り込んだ溶融樹脂３によ
り後方へ後退した射出駆動体２を前方へ押し出して、前
記溶融樹脂３を射出シリンダ１前端より金型４内へ射出
すると共に、更にこの射出駆動体２を前方へ加圧して金
型４内へ送り込んだ樹脂を保圧し得るように構成した射
出成形機において、前記射出駆動体２を前方へ押出制御
する射出駆動用シリンダ装置５にこの射出駆動用シリン
ダ装置５を所定保持圧で支承して射出圧を制御する圧力
制御用シリンダ装置６を設けたことを特徴とする射出成
形機に係るものである。The molten resin 3 is fed into a front portion of an injection driving body 2 such as an injection screw or an injection plunger in an injection cylinder 1 and the injection driving body 2 retreated backward by the molten resin 3 fed into the front portion is moved forward. So that the molten resin 3 is injected from the front end of the injection cylinder 1 into the mold 4, and the injection driving body 2 is further pressed forward to maintain the pressure of the resin fed into the mold 4. In the injection molding machine, a pressure control cylinder device 6 for controlling the injection pressure by supporting the injection drive cylinder device 5 at a predetermined holding pressure on the injection drive cylinder device 5 for controlling the injection drive body 2 to push forward. Provided in an injection molding machine.

【００１４】また、前記射出駆動用シリンダ装置５で射
出駆動体２の射出ストローク或いは射出速度を制御し得
るように構成し、前記圧力制御用シリンダ装置６で前記
所定保持圧を調整設定して前記射出圧を所定値に制御し
得るように構成したことを特徴とする請求項１記載の射
出成形機に係るものである。The injection drive cylinder device 5 is configured to control the injection stroke or the injection speed of the injection drive unit 2, and the pressure control cylinder device 6 adjusts and sets the predetermined holding pressure. 2. The injection molding machine according to claim 1, wherein the injection pressure is controlled to a predetermined value.

【００１５】また、前記圧力制御用シリンダ装置６の前
記所定保持圧の調整設定により前記保圧制御し得るよう
に構成したことを特徴とする請求項１，２のいずれか１
項に記載の射出成形機に係るものである。Further, the pressure control cylinder device 6 is configured so that the pressure holding control can be performed by adjusting and setting the predetermined holding pressure.
The present invention relates to the injection molding machine described in the section.

【００１６】また、前記圧力制御用シリンダ装置６また
は前記射出駆動用シリンダ装置５に圧力変化の脈動や瞬
時に生じる衝撃圧を吸収するアッキムレータ６Ａを設け
たことを特徴とする請求項１〜３のいずれか１項に記載
の射出成形機に係るものである。Further, the pressure control cylinder device 6 or the injection drive cylinder device 5 is provided with an accumulator 6A for absorbing a pulsation of a pressure change or an instantaneous impact pressure. The present invention relates to the injection molding machine according to any one of the above aspects.

【００１７】また、射出シリンダ１内の射出スクリュー
若しくは射出プランジャーなどの射出駆動体２の前部に
溶融樹脂３を送り込み、この前部に送り込んだ溶融樹脂
３により後方へ後退した射出駆動体２を前方へ押し出し
て、前記溶融樹脂３を射出シリンダ１前端より金型４内
へ射出すると共に、更にこの射出駆動体２を前方へ加圧
して金型４内へ送り込んだ樹脂を保圧する射出成形法に
おいて、前記射出駆動体２を前方へ押出制御する射出駆
動用シリンダ装置５にこの射出駆動用シリンダ装置５を
所定保持圧で支承して射出圧を制御する圧力制御用シリ
ンダ装置６を設けて、射出駆動用シリンダ装置５による
射出制御における射出駆動体２の射出圧を所定値に制御
することを特徴とする射出成形方法に係るものである。Further, the molten resin 3 is fed into a front portion of an injection driving body 2 such as an injection screw or an injection plunger in the injection cylinder 1 and the injection driving body 2 retreated backward by the molten resin 3 fed into the front portion. To extrude the molten resin 3 from the front end of the injection cylinder 1 into the mold 4, and further press the injection drive 2 forward to hold the resin fed into the mold 4. In the method, an injection drive cylinder device 5 for controlling the injection drive body 2 to push forward is provided with a pressure control cylinder device 6 for supporting the injection drive cylinder device 5 at a predetermined holding pressure and controlling the injection pressure. The present invention also relates to an injection molding method characterized in that the injection pressure of the injection driving body 2 in the injection control by the injection driving cylinder device 5 is controlled to a predetermined value.

【００１８】また、前記射出駆動用シリンダ装置５で射
出駆動体２の射出ストローク或いは射出速度を制御し、
前記圧力制御用シリンダ装置６で前記所定保持圧を調整
設定して前記射出圧を所定値に制御することを特徴とす
る請求項５記載の射出成形方法に係るものである。Further, the injection stroke or the injection speed of the injection driving body 2 is controlled by the injection driving cylinder device 5,
6. The injection molding method according to claim 5, wherein the predetermined holding pressure is adjusted and set by the pressure control cylinder device 6 to control the injection pressure to a predetermined value.

【００１９】また、前記圧力制御用シリンダ装置６の前
記所定保持圧の調整設定により前記保圧制御することを
特徴とする請求項５，６のいずれか１項に記載の射出成
形方法に係るものである。7. The injection molding method according to claim 5, wherein the holding pressure is controlled by adjusting and setting the predetermined holding pressure of the pressure control cylinder device. It is.

【００２０】[0020]

【発明の実施の形態】好適と考える本発明の実施の形態
（発明をどのように実施するか）を、図面に基づいてそ
の作用効果を示して簡単に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention (how to implement the invention) will be briefly described with reference to the drawings, showing the operational effects thereof.

【００２１】射出駆動用シリンダ装置５で射出駆動体２
の射出ストローク或いは射出速度を制御し、前記圧力制
御用シリンダ装置６で前記所定保持圧を調整設定して前
記射出圧を所定値に制御する。The injection driving body 2 is driven by the injection driving cylinder device 5.
The injection stroke or injection speed is controlled, and the predetermined holding pressure is adjusted and set by the pressure control cylinder device 6 to control the injection pressure to a predetermined value.

【００２２】即ち、射出駆動用シリンダ装置５で射出駆
動体２を駆動制御して射出を行う際に、この射出駆動用
シリンダ装置５を圧力制御用シリンダ装置６により所定
保持圧で支承するから、圧力制御用シリンダ装置６によ
り調整設定した一定の保持圧にコントロールされた状態
で射出を行うことができることとなる。That is, when the injection driving cylinder 2 is driven and controlled by the injection driving cylinder device 5 to perform injection, the injection driving cylinder device 5 is supported by the pressure control cylinder device 6 at a predetermined holding pressure. Injection can be performed in a state where the pressure is controlled to a constant holding pressure adjusted and set by the pressure control cylinder device 6.

【００２３】また、射出終了時においてキャビティーが
満杯となりピーク圧力が生じようとしても圧力制御用シ
リンダ装置６により所定の保持圧に保持された状態に維
持されるから、即ちこのピーク圧力は吸収或いは緩衝さ
れるから、従来例に比べてピーク圧力も生じにくく、バ
リ不良，離型不良などの問題も生じにくい。Further, even if the cavity becomes full at the end of injection and a peak pressure is generated, the pressure is maintained at a predetermined holding pressure by the pressure control cylinder device 6, that is, the peak pressure is absorbed or absorbed. Since the buffering is performed, a peak pressure is less likely to occur than in the conventional example, and problems such as a burr defect and a mold release problem are less likely to occur.

【００２４】また、一つのアクチェータでなく、二つの
アクチェータとして保圧制御用のアクチェータとして圧
力制御用シリンダ装置６を用いるから、充填工程から保
圧工程の切り換えも瞬時にして確実に行なえることとな
る。Further, since the pressure control cylinder device 6 is used as an actuator for holding pressure control as two actuators instead of one actuator, switching from the filling process to the holding pressure process can be instantaneously and reliably performed. Become.

【００２５】また、このように圧力制御用シリンダ装置
６により射出時において、一定圧力値或いは段階的或い
は無段階的に保持圧を調整すれば、従来例と異なり、常
にコントロールされた射出圧の下で射出駆動用シリンダ
装置５により射出制御されるため、計量射出が精度良く
行い得るし、また、このように圧力コントロール下での
射出であるため、キャビティー構造や樹脂特性に対応し
て前記射出圧をコントロールすることが可能となり前記
従来の問題点が生じにくい良好な射出成形が行える。In addition, if the holding pressure is adjusted by the pressure control cylinder device 6 at the time of injection at a constant pressure value or stepwise or steplessly, unlike the conventional example, the injection pressure is always controlled under the controlled injection pressure. Injection is controlled by the injection drive cylinder device 5, so that the metering injection can be performed with high precision. In addition, since the injection is performed under pressure control, the injection is performed in accordance with the cavity structure and resin characteristics. The pressure can be controlled, and good injection molding in which the above-mentioned conventional problems are unlikely to occur can be performed.

【００２６】また、更に圧力コントロールの下での様々
な射出時の諸データを入手することで更に高い精度・良
品率での射出成形が行え、計量・充填制御の良好な管理
が可能となる。Furthermore, by obtaining various data at the time of injection under pressure control, injection molding can be performed with higher accuracy and a good product rate, and good management of metering and filling control can be performed.

【００２７】また、このように本発明は簡易な構成で実
現可能となり、既存の成形機にも容易に適用可能な創作
思想のため、実用性にも秀れる。Further, as described above, the present invention can be realized with a simple configuration, and is excellent in practicality because of a creative concept that can be easily applied to existing molding machines.

【００２８】[0028]

【実施例】本発明の具体的な実施例について図面に基づ
いて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

【００２９】図示した本実施例は、インライン方式の成
形機で、射出駆動体２として射出スクリューを回転装置
７により回転して前端部に溶融樹脂３を逆止リング８を
介して送り込み計量し、計量完了後射出駆動用シリンダ
装置５により前方へ射出スクリュー２を突出制御し、溶
融樹脂３を金型４内のキャビティー９内へ湯道10を介し
て充填させるものである。The illustrated embodiment is an in-line molding machine, in which an injection screw is rotated by a rotating device 7 as an injection driving body 2 to feed a molten resin 3 to a front end thereof via a check ring 8 and weigh it. After the measurement is completed, the injection screw 2 is controlled to protrude forward by the injection driving cylinder device 5, and the molten resin 3 is filled into the cavity 9 in the mold 4 through the runner 10.

【００３０】本実施例は、油圧シリンダ装置を採用した
前記射出駆動用シリンダ装置５に同様に油圧シリンダ装
置を採用した圧力制御用シリンダ装置６を設けた構成と
している。In this embodiment, the injection driving cylinder device 5 employing a hydraulic cylinder device is provided with a pressure control cylinder device 6 also employing a hydraulic cylinder device.

【００３１】具体的には、圧力制御用シリンダ装置６の
ピストンロッド11を射出駆動用シリンダ装置５のシリン
ダ12に連結し、射出駆動用シリンダ装置５をこの圧力制
御用シリンダ装置６により支承する構成としている。Specifically, the piston rod 11 of the pressure control cylinder device 6 is connected to the cylinder 12 of the injection drive cylinder device 5, and the injection drive cylinder device 5 is supported by the pressure control cylinder device 6. And

【００３２】即ち、本実施例では、射出駆動用シリンダ
装置５を圧力制御用シリンダ装置６により所定保持圧で
支承することで射出圧を制御するように構成し、具体的
には、前記射出駆動用シリンダ装置５で射出駆動体２の
射出ストローク或いは射出速度を制御し得るように構成
し、前記圧力制御用シリンダ装置６で前記所定保持圧を
調整設定して前記射出圧を所定値に制御し得るように構
成し、更にこの圧力制御用シリンダ装置６により保圧制
御するように構成している。That is, in this embodiment, the injection driving cylinder device 5 is supported by the pressure control cylinder device 6 at a predetermined holding pressure to control the injection pressure. The injection cylinder 2 is configured to control the injection stroke or the injection speed of the injection driving body 2, and the pressure control cylinder device 6 adjusts and sets the predetermined holding pressure to control the injection pressure to a predetermined value. The pressure control cylinder device 6 is used to control the holding pressure.

【００３３】従って、本実施例の成形機並びにこれに基
づく成形法は、従来通り射出駆動用シリンダ装置５によ
り射出駆動体２の速度制御を行なえる上で、しかも、圧
力制御用シリンダ装置６により射出圧を一定に保持する
から、圧力コントロールされた状態で射出できることに
なる。Therefore, the molding machine of the present embodiment and the molding method based on the same can control the speed of the injection driving body 2 by the injection driving cylinder device 5 as in the prior art, and furthermore, by the pressure control cylinder device 6. Since the injection pressure is kept constant, injection can be performed in a pressure-controlled state.

【００３４】従って、図３(2)に示すように射出終了時
においてキャビティーが満杯となりピーク圧力が生じよ
うとしても圧力制御用シリンダ装置６により所定の保持
圧に保持された状態に維持されるから、即ちこのピーク
圧力は吸収或いは緩衝されるから、図３(1)に示すよう
な従来例に比べてピーク圧力も生じにくく、バリ不良，
離型不良などの問題も生じにくい。Therefore, as shown in FIG. 3 (2), even when the cavity is full at the end of injection and a peak pressure is to be generated, the state is maintained at a predetermined holding pressure by the pressure control cylinder device 6. Since the peak pressure is absorbed or buffered, the peak pressure is less likely to occur than in the conventional example as shown in FIG.
Problems such as poor mold release are unlikely to occur.

【００３５】また、一つのアクチェータでなく、二つの
アクチェータとし、保圧制御用のアクチェータとして圧
力制御用シリンダ装置６を用いるから、充填工程から保
圧工程の切り換えも瞬時にして確実に行なえることとな
る。Further, since two actuators are used instead of one actuator and the pressure control cylinder device 6 is used as an actuator for holding pressure control, the switching from the filling process to the holding pressure process can be instantaneously and reliably performed. Becomes

【００３６】また、このように圧力制御用シリンダ装置
６により、射出時において、図３(2)に示すように一定
圧力値或いは段階的或いは無段階的に保持圧を調整すれ
ば、図３(1)に示す従来例と異なり、常にコントロール
された射出圧の下で射出駆動用シリンダ装置５により射
出制御されるため、計量射出が精度良く行い得るし、ま
た、このように圧力コントロール下での射出であるた
め、キャビティー構造や樹脂特性に対応して前記射出圧
をコントロールすることが可能となり前記従来の問題点
が生じにくい良好な射出成形が行える。When the holding pressure is adjusted by the pressure control cylinder device 6 at the time of injection, as shown in FIG. 3 (2), a constant pressure value or stepwise or steplessly, as shown in FIG. Unlike the conventional example shown in 1), the injection is controlled by the injection drive cylinder device 5 under a controlled injection pressure, so that the metering injection can be performed with high accuracy. Since injection is used, the injection pressure can be controlled in accordance with the cavity structure and resin characteristics, and good injection molding that does not easily cause the conventional problems can be performed.

【００３７】また、更に圧力コントロールの下での様々
な射出時の諸データを入手することで更に高い精度・良
品率での射出成形が行え、計量・充填制御の良好な管理
が可能となる。Further, by obtaining various data at the time of injection under pressure control, injection molding can be performed with higher accuracy and a good product rate, and good management of metering and filling control can be performed.

【００３８】また、このように本発明は簡易な構成で実
現可能となり、既存の成形機にも容易に適用可能な創作
思想のため、実用性にも秀れる。As described above, the present invention can be realized with a simple configuration, and is excellent in practicality because of a creative concept that can be easily applied to existing molding machines.

【００３９】また、本実施例では、圧力一定を保持する
手段として圧力制御用シリンダ装置６に調整圧力弁を設
けて、この圧力弁の作動圧力値を調整設定することによ
り保持圧をコントロールするが、圧力の脈動やピーク反
抗圧力など瞬時に生じる圧力変化を対応性良く吸収する
ように圧力コントロールの補助としてアッキムレータ６
Ａを射出駆動用シリンダ装置５，圧力制御用シリンダ装
置６の双方に設けている。Further, in this embodiment, an adjusting pressure valve is provided in the pressure control cylinder device 6 as means for maintaining a constant pressure, and the holding pressure is controlled by adjusting and setting the operating pressure value of the pressure valve. The accumulator 6 assists the pressure control so as to absorb the instantaneous pressure changes, such as pressure pulsation and peak reaction pressure, in a responsive manner.
A is provided in both the injection drive cylinder device 5 and the pressure control cylinder device 6.

【００４０】図中符号13は本体ケース、14は圧油バル
ブ、15はゴム袋、16は充填空気である。In the figure, reference numeral 13 denotes a main body case, 14 denotes a pressure oil valve, 15 denotes a rubber bag, and 16 denotes charged air.

【００４１】[0041]

【発明の効果】本発明は上述のように構成したから、射
出時において、圧力コントロールされた下で射出制御で
きるため、反抗圧力や諸条件の違いなどによる圧力変化
が生じにくく、そのためバリ不良や離型不良などの諸問
題が生じにくい。Since the present invention is constructed as described above, the injection can be controlled under pressure control at the time of injection, so that a pressure change due to a reaction pressure or a difference in various conditions is unlikely to occur. Various problems such as poor release are unlikely to occur.

【００４２】また、射出終了時においてキャビティーが
満杯となりピーク圧力が生じようとしても圧力制御用シ
リンダ装置により所定の保持圧に保持された状態に維持
されるから、即ちこのピーク圧力は吸収或いは緩衝され
るから、従来例に比べてピーク圧力も生じにくく、バリ
不良，離型不良などの問題も生じにくい。Even if the cavity becomes full at the end of injection and a peak pressure is generated, the pressure is maintained at a predetermined holding pressure by the pressure control cylinder device, that is, the peak pressure is absorbed or buffered. Therefore, compared to the conventional example, a peak pressure is less likely to occur, and problems such as defective burrs and defective mold release are less likely to occur.

【００４３】また、一つのアクチェータでなく、二つの
アクチェータとし、保圧制御用のアクチェータとして圧
力制御用シリンダ装置を用いるから、充填工程から保圧
工程の切り換えも瞬時にして確実に行なえることとな
る。Also, since two actuators are used instead of one actuator and a pressure control cylinder device is used as an actuator for holding pressure control, switching from the filling process to the holding pressure process can be instantaneously and reliably performed. Become.

【００４４】また、このように圧力制御用シリンダ装置
により射出時において、一定圧力値或いは段階的或いは
無段階的に保持圧を調整すれば、従来例と異なり、常に
コントロールされた射出圧の下で射出駆動用シリンダ装
置により射出制御されるため、計量射出が精度良く行い
得るし、また、このように圧力コントロール下での射出
であるため、キャビティー構造や樹脂特性に対応して前
記射出圧をコントロールすることが可能となり前記従来
の問題点が生じにくい良好な射出成形が行える。In addition, if the holding pressure is adjusted by a constant pressure value or stepwise or steplessly at the time of injection by the pressure control cylinder device as described above, unlike the conventional example, the injection pressure is always controlled under the controlled injection pressure. Since the injection is controlled by the injection drive cylinder device, the metering injection can be performed with high accuracy, and since the injection is performed under pressure control as described above, the injection pressure is adjusted according to the cavity structure and the resin characteristics. Control can be performed, and good injection molding in which the above-mentioned conventional problems are unlikely to occur can be performed.

【００４５】また、更に圧力コントロールの下での様々
な射出時の諸データを入手することで更に高い精度・良
品率での射出成形が行え、計量・充填制御の良好な管理
が可能となる。Further, by obtaining various data at the time of injection under pressure control, injection molding can be performed with higher accuracy and a good product rate, and good management of metering and filling control can be performed.

【００４６】また、このように本発明は簡易な構成で実
現可能となり、既存の成形機にも容易に適用可能な創作
思想のため、実用性にも秀れる射出成形機並びに射出成
形方法となる。Further, as described above, the present invention can be realized with a simple configuration, and is an injection molding machine and an injection molding method which are excellent in practicality because of a creative concept which can be easily applied to existing molding machines. .

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

【図１】本実施例の概略構成説明図である。FIG. 1 is a schematic structural explanatory view of the present embodiment.

【図２】本実施例の圧力制御の補助として設けるアッキ
ムレータの説明構成図である。FIG. 2 is an explanatory configuration diagram of an accumulator provided as an aid for pressure control in the present embodiment.

【図３】従来例(1)と本実施例(2)との射出圧変化を比較
した制御説明用グラフである。FIG. 3 is a control explanatory graph comparing an injection pressure change between the conventional example (1) and the present embodiment (2).

【符号の説明】[Explanation of symbols]

１ 射出シリンダ ２ 射出駆動体 ３ 溶融樹脂 ４ 金型 ５ 射出駆動用シリンダ装置 ６ 圧力制御用シリンダ装置 ６Ａ アッキムレータ DESCRIPTION OF SYMBOLS 1 Injection cylinder 2 Injection drive body 3 Molten resin 4 Die 5 Injection drive cylinder device 6 Pressure control cylinder device 6A Accumulator

───────────────────────────────────────────────────── フロントページの続き (72)発明者 中沢 修 東京都大田区久が原２丁目11番14号 三共 化成株式会社内 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Osamu Nakazawa 2-11-14 Kugahara, Ota-ku, Tokyo Inside Sankyo Chemical Co., Ltd.

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 射出シリンダ内の射出スクリュー若しく
は射出プランジャーなどの射出駆動体の前部に溶融樹脂
を送り込み、この前部に送り込んだ溶融樹脂により後方
へ後退した射出駆動体を前方へ押し出して、前記溶融樹
脂を射出シリンダ前端より金型内へ射出すると共に、更
にこの射出駆動体を前方へ加圧して金型内へ送り込んだ
樹脂を保圧し得るように構成した射出成形機において、
前記射出駆動体を前方へ押出制御する射出駆動用シリン
ダ装置にこの射出駆動用シリンダ装置を所定保持圧で支
承して射出圧を制御する圧力制御用シリンダ装置を設け
たことを特徴とする射出成形機。1. A molten resin is fed into a front portion of an injection driving body such as an injection screw or an injection plunger in an injection cylinder, and the injection driving body retreated backward is pushed forward by the molten resin fed into the front portion. An injection molding machine configured to inject the molten resin into the mold from the front end of the injection cylinder, and to further pressurize the injection drive body to keep the resin fed into the mold,
Injection molding, characterized in that an injection drive cylinder device for controlling the injection drive body to move forward is provided with a pressure control cylinder device for supporting the injection drive cylinder device at a predetermined holding pressure and controlling the injection pressure. Machine. 【請求項２】 前記射出駆動用シリンダ装置で射出駆動
体の射出ストローク或いは射出速度を制御し得るように
構成し、前記圧力制御用シリンダ装置で前記所定保持圧
を調整設定して前記射出圧を所定値に制御し得るように
構成したことを特徴とする請求項１記載の射出成形機。2. The injection driving cylinder device is configured to control an injection stroke or an injection speed of an injection driving body, and the pressure control cylinder device adjusts and sets the predetermined holding pressure to reduce the injection pressure. 2. The injection molding machine according to claim 1, wherein the injection molding machine is configured to be controlled to a predetermined value. 【請求項３】 前記圧力制御用シリンダ装置の前記所定
保持圧の調整設定により前記保圧制御し得るように構成
したことを特徴とする請求項１，２のいずれか１項に記
載の射出成形機。3. The injection molding according to claim 1, wherein the pressure holding control can be performed by adjusting and setting the predetermined holding pressure of the pressure control cylinder device. Machine. 【請求項４】 前記圧力制御用シリンダ装置または前記
射出駆動用シリンダ装置に圧力変化の脈動や瞬時に生じ
る衝撃圧を吸収するアッキムレータを設けたことを特徴
とする請求項１〜３のいずれか１項に記載の射出成形
機。4. The pressure control cylinder device or the injection drive cylinder device is provided with an accumulator for absorbing a pulsation of a pressure change or an instantaneous impact pressure. An injection molding machine according to the item. 【請求項５】 射出シリンダ内の射出スクリュー若しく
は射出プランジャーなどの射出駆動体の前部に溶融樹脂
を送り込み、この前部に送り込んだ溶融樹脂により後方
へ後退した射出駆動体を前方へ押し出して、前記溶融樹
脂を射出シリンダ前端より金型内へ射出すると共に、更
にこの射出駆動体を前方へ加圧して金型内へ送り込んだ
樹脂を保圧する射出成形法において、前記射出駆動体を
前方へ押出制御する射出駆動用シリンダ装置にこの射出
駆動用シリンダ装置を所定保持圧で支承して射出圧を制
御する圧力制御用シリンダ装置を設けて、射出駆動用シ
リンダ装置による射出制御における射出駆動体の射出圧
を所定値に制御することを特徴とする射出成形方法。5. A molten resin is fed into a front part of an injection driving body such as an injection screw or an injection plunger in an injection cylinder, and the molten driving resin fed into the front part pushes out the injection driving body which is retreated backward to the front. In the injection molding method of injecting the molten resin into the mold from the front end of the injection cylinder and further pressing the injection drive body forward to hold the resin fed into the mold, the injection drive body is moved forward. The injection drive cylinder device that controls the extrusion is provided with a pressure control cylinder device that supports the injection drive cylinder device at a predetermined holding pressure and controls the injection pressure. An injection molding method comprising controlling an injection pressure to a predetermined value. 【請求項６】 前記射出駆動用シリンダ装置で射出駆動
体の射出ストローク或いは射出速度を制御し、前記圧力
制御用シリンダ装置で前記所定保持圧を調整設定して前
記射出圧を所定値に制御することを特徴とする請求項５
記載の射出成形方法。6. The injection drive cylinder device controls an injection stroke or an injection speed of an injection drive body, and the pressure control cylinder device adjusts and sets the predetermined holding pressure to control the injection pressure to a predetermined value. 6. The method according to claim 5, wherein
The injection molding method according to the above. 【請求項７】 前記圧力制御用シリンダ装置の前記所定
保持圧の調整設定により前記保圧制御することを特徴と
する請求項５，６のいずれか１項に記載の射出成形方
法。7. The injection molding method according to claim 5, wherein the holding pressure control is performed by adjusting and setting the predetermined holding pressure of the pressure control cylinder device.
JP2041397A 1997-02-03 1997-02-03 Injection molder and injection molding method Pending JPH10217304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2041397A JPH10217304A (en) 1997-02-03 1997-02-03 Injection molder and injection molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2041397A JPH10217304A (en) 1997-02-03 1997-02-03 Injection molder and injection molding method

Publications (1)

Publication Number Publication Date
JPH10217304A true JPH10217304A (en) 1998-08-18

Family

ID=12026362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2041397A Pending JPH10217304A (en) 1997-02-03 1997-02-03 Injection molder and injection molding method

Country Status (1)

Country Link
JP (1) JPH10217304A (en)

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