JP2843633B2 - Injection cylinder pressure closed loop control method for injection molding machine - Google Patents
Injection cylinder pressure closed loop control method for injection molding machineInfo
- Publication number
- JP2843633B2 JP2843633B2 JP2045757A JP4575790A JP2843633B2 JP 2843633 B2 JP2843633 B2 JP 2843633B2 JP 2045757 A JP2045757 A JP 2045757A JP 4575790 A JP4575790 A JP 4575790A JP 2843633 B2 JP2843633 B2 JP 2843633B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- injection
- injection cylinder
- oil
- closed loop
- 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 - Fee Related
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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、射出成形機の射出シリンダ圧力閉ループ
制御方法に係り、特に、繰返し安定性のある制御を実現
することができる射出成形機の射出シリンダ圧力閉ルー
プ制御方法に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection cylinder pressure closed loop control method for an injection molding machine, and in particular, to an injection molding machine capable of realizing control with repeated stability. The present invention relates to a cylinder pressure closed loop control method.
一般に、射出成形機の射出シリンダの制御方法は第２
図に示すような制御が行われている。第２図において、
参照符号10はバレルであり、バレル10の先端には図示し
ない金型に当接して金型の樹脂注入口へ後述の溶融樹脂
を導くノズル12が設けられ、その内部にはスクリュ14が
挿嵌され、回動および軸方向進退自在となっている。Generally, the control method of the injection cylinder of the injection molding machine is the second method.
The control as shown in the figure is performed. In FIG.
Reference numeral 10 denotes a barrel, and a nozzle 12 is provided at the tip of the barrel 10 to guide a molten resin, which will be described later, into a resin injection port of the mold in contact with a mold (not shown), and a screw 14 is inserted therein. It is freely rotatable and axially retractable.
前記バレル10後部には原料供給用ホッパ20が設けら
れ、ペレットまたはパウダー状の樹脂原料がこのホッパ
20を通じてバレル10内に供給される。A raw material supply hopper 20 is provided at the rear of the barrel 10, and pellet or powder resin material is supplied to the hopper 20.
Feed into barrel 10 through 20.
前記スクリュ14はその後端部を回転部材16と連結さ
れ、この回転部材16は連結部材18にベアリング22を介し
て回転自在に支承されている。この回転部材16は、その
後方に設けられた油圧モータ24により回転駆動される。
また、一対の射出シリンダ26,26が別に設けられ、回転
部材16と連結部材18とで構成される軸受ユニット28に、
この射出シリンダ26,26内の射出ピストン30,30に連結さ
れているロッド32,32が固定されている。The screw 14 is connected at its rear end to a rotating member 16, which is rotatably supported by a connecting member 18 via a bearing 22. The rotating member 16 is driven to rotate by a hydraulic motor 24 provided behind the rotating member 16.
In addition, a pair of injection cylinders 26, 26 are provided separately, and a bearing unit 28 including the rotating member 16 and the connecting member 18 includes:
Rods 32, 32 connected to the injection pistons 30, 30 in the injection cylinders 26, 26 are fixed.
従って、スクリュ14は一対の射出シリンダ26,26によ
り、軸受ユニット28を介して軸方向に進退移動する。こ
の場合、前記油圧モータ24は二位置切換弁34を介して可
変吐出ポンプ36に接続されており、前記スクリュ14は二
位置切換弁34の切換えにより回転部材16を介して回転駆
動される。Accordingly, the screw 14 moves forward and backward in the axial direction by the pair of injection cylinders 26, 26 via the bearing unit 28. In this case, the hydraulic motor 24 is connected to a variable discharge pump 36 via a two-position switching valve 34, and the screw 14 is driven to rotate via the rotating member 16 by switching the two-position switching valve 34.
また、射出シリンダ26,26の射出戻り側室44,44および
射出側室42,42は三位置切換弁40にそれぞれ接続され、
この三位置切換弁40と可変吐出ポンプ36との間には流量
調整弁38が接続されている。The injection return chambers 44, 44 and the injection chambers 42, 42 of the injection cylinders 26, 26 are connected to the three-position switching valve 40, respectively.
A flow control valve 38 is connected between the three-position switching valve 40 and the variable discharge pump 36.
このように構成された射出装置は、次のように動作す
る。The injection device thus configured operates as follows.
先ず、計量時は油圧モータ24に接続された二位置切換
弁34は励磁により切換えられ、可変吐出ポンプ36から吐
出される圧油により油圧モータ24を回転駆動する。その
油圧モータ24の回転により前記回転部材16はスクリュ14
を回転し、原料供給用ホッパ20からバレル10内に供給さ
れた原料は、バレル10の外周に設けられたヒータの熱お
よびスクリュ14の回転による樹脂の剪断発熱等により溶
融する。さらに、バレル10前方に溶融樹脂を蓄えなが
ら、回転しているスクリュ14はバレル10前方に溜まった
溶融樹脂の圧力で後退し、この溶融樹脂が所定の量に達
したとき二位置切換弁34の非励磁によりブロックさせて
油圧モータ24の回転を停止させる。First, at the time of metering, the two-position switching valve 34 connected to the hydraulic motor 24 is switched by excitation, and the hydraulic motor 24 is rotationally driven by pressure oil discharged from the variable discharge pump 36. The rotation of the hydraulic motor 24 causes the rotation member 16 to
The raw material supplied into the barrel 10 from the raw material supply hopper 20 is melted by the heat of the heater provided on the outer periphery of the barrel 10 and the heat generated by the shearing of the resin due to the rotation of the screw 14. Further, while storing the molten resin in front of the barrel 10, the rotating screw 14 retreats by the pressure of the molten resin accumulated in front of the barrel 10, and when the molten resin reaches a predetermined amount, the two-position switching valve 34 The rotation of the hydraulic motor 24 is stopped by being blocked by non-excitation.
次に、三位置切換弁40のソレノイドが励磁されると、
流量調整弁38を介して可変吐出ポンプ36から吐出される
圧油は射出シリンダ26,26の射出側室42内に流入する。
この場合、射出戻り側室44の油はタンク46内に排出され
る。Next, when the solenoid of the three-position switching valve 40 is excited,
The pressure oil discharged from the variable discharge pump 36 via the flow control valve 38 flows into the injection side chamber 42 of the injection cylinders 26,26.
In this case, the oil in the injection return side chamber 44 is discharged into the tank 46.
このようにして、一対の射出シリンダ26,26のピスト
ン30,30が左進するので、このピストンのロッド32,32に
連結しているスクリュ14は軸受ユニット28と共に左進
し、溶融樹脂の射出を行うことができる。この場合、従
来、可変吐出ポンプ36の吐出路に圧力センサS1を配設
し、不図示のコントローラにフィードバックすると共に
コントローラ内で設定値との差異を比較して電磁リリー
フ弁48に差異分の信号を送り圧力を制御する方法が行わ
れている。In this way, the pistons 30, 30 of the pair of injection cylinders 26, 26 move leftward, so that the screws 14 connected to the rods 32, 32 of the pistons move leftward together with the bearing unit 28 to inject the molten resin. It can be performed. In this case, conventionally, disposed a pressure sensor S 1 to the discharge passage of the variable discharge pump 36, not shown controller of the difference amount to the electromagnetic relief valve 48 by comparing the difference between the set value in the controller as well as feedback A method of controlling a pressure by sending a signal has been used.
また、特開昭62−228701号公報には、射出シリンダ2
6,26の圧力制御の応答性を改善するために、吐出路の流
量弁を全く不要として前記センサS1からのフィードバッ
ク信号と設定値とを不図示のコントローラ内で比較し、
偏差を零とするよう指令信号を直接可変吐出ポンプ36へ
送出し、吐出量を制御することにより射出シリンダ26,2
6に流入する圧油を制御する方法が示されている。Japanese Patent Application Laid-Open No. 62-228701 discloses an injection cylinder 2
To improve the response of the pressure control of 6, 26, and a feedback signal and the set value from the sensor S 1 in comparison with the not shown controller flow valve of the discharge passage as no need,
By sending a command signal directly to the variable discharge pump 36 so as to make the deviation zero, and controlling the discharge amount, the injection cylinders 26 and 2 are controlled.
A method for controlling the pressure oil flowing into 6 is shown.
しかしながら、前述した射出シリンダの圧力閉ループ
制御方法によれば、可変吐出ポンプの吐出路に設けら圧
力センサからの吐出圧だけに基づくフィードバック信号
によって圧力制御を行っているため、射出速度が速くな
るほど射出シリンダの射出戻り側の圧損による背圧が大
きくなり、実質的に射出力は低下する。しかも、射出シ
リンダの射出戻り側の圧力は無制御状態であるため、油
温の変化によっても変化する。このことは、スクリュが
停止している状態であるならば影響は少ないが、圧力閉
ループ制御に切換る１次保圧の時点においてはスクリュ
が前進しているため問題となる。すなわち、吐出ポンプ
の吐出圧力だけが制御されて射出シリンダに入る油圧を
コントロールする方法であるため、上記問題が生じて繰
返し安定性のある制御を行うことが困難であった。However, according to the above-described injection cylinder pressure closed loop control method, the pressure is controlled by a feedback signal provided only in the discharge path of the variable discharge pump based on the discharge pressure from the pressure sensor. The back pressure due to the pressure loss on the injection return side of the cylinder increases, and the firing power substantially decreases. In addition, since the pressure on the injection return side of the injection cylinder is in an uncontrolled state, it also changes due to a change in oil temperature. This has little effect if the screw is in a stopped state, but poses a problem since the screw is moving forward at the time of the primary dwell when switching to pressure closed loop control. That is, since only the discharge pressure of the discharge pump is controlled to control the oil pressure entering the injection cylinder, the above problem occurs, and it has been difficult to repeatedly perform stable control.
そこで、本発明の目的は、射出成形機の射出制御を行
う射出シリンダの圧力制御において、油温の変化に影響
されることなく、繰返し安定性のある射出力を実現する
ことができる射出成形機の射出シリンダ圧力閉ループ制
御方法を提供することにある。Accordingly, an object of the present invention is to provide an injection molding machine capable of achieving a repeatedly stable injection power without being affected by a change in oil temperature in pressure control of an injection cylinder for performing injection control of the injection molding machine. To provide an injection cylinder pressure closed loop control method.
本発明に係る射出成形機の射出シリンダ圧力閉ループ
制御方法は、可変吐出ポンプから供給される圧油を切換
弁を介して射出シリンダに供給して、射出シリンダのピ
ストンロッドを進退自在に構成し、この射出シリンダの
ピストンロッドと連動させてスクリュの進退動作を行っ
て溶融樹脂の射出制御を行うように構成した射出成形機
からなり、 射出シリンダに対して、射出動作側油室の油圧を検出
する第１のセンサ（S1）と、背圧動作側油室の油圧を検
出する第２のセンサ（S2）と、可変吐出ポンプによる圧
油の吐出圧力を制御する圧力制御手段とを設け、 第１のセンサ（S1）の検出値（P1）と第２のセンサ
（S2）の検出値（P2）との差圧（ΔＰ＝P1−P2）を、射
出シリンダの実質的な射出力が低下しないように予め設
定した設定値（P0）と比較し、前記差圧（ΔＰ）と前記
設定値（P0）との差分に基づいて前記圧力制御手段を制
御することを特徴とする。The injection cylinder pressure closed loop control method of the injection molding machine according to the present invention supplies the pressure oil supplied from the variable discharge pump to the injection cylinder through the switching valve, and the piston rod of the injection cylinder is configured to be able to move forward and backward, It consists of an injection molding machine configured to control the injection of molten resin by moving the screw forward and backward in conjunction with the piston rod of this injection cylinder, and detects the oil pressure of the injection operation side oil chamber for the injection cylinder. A first sensor (S1), a second sensor (S2) for detecting the oil pressure of the back pressure operation side oil chamber, and pressure control means for controlling a discharge pressure of the pressure oil by the variable discharge pump. The difference (ΔP = P1−P2) between the detection value (P1) of the sensor (S1) and the detection value (P2) of the second sensor (S2) is determined so that the substantial injection power of the injection cylinder does not decrease. To the preset value (P0) And controlling the pressure control means based on a difference between the differential pressure (ΔP) and the set value (P0).
本発明に係る射出シリンダ圧力閉ループ制御方法によ
れば、射出シリンダの射出側室に入る油圧と射出戻り側
室から出る油圧との両方を検出し、これらの圧力差と予
め設定しておいた値とを比較してこの差分に基づく指令
信号をフィードバックして圧力制御手段を閉ループ制御
する方法としたため、油温などの変化に対してもコント
ロール下に置くことができる。従って、油温の変化に影
響されずに繰返し安定性の優れた射出力を実現すること
ができる。According to the injection cylinder pressure closed loop control method according to the present invention, both the hydraulic pressure entering the injection side chamber of the injection cylinder and the hydraulic pressure exiting from the injection return side chamber are detected, and a difference between these pressures and a preset value are determined. Since the pressure control means is closed-loop controlled by feeding back a command signal based on the difference, the control can be performed even when the oil temperature or the like changes. Therefore, it is possible to realize a radiation output having excellent repetition stability without being affected by a change in oil temperature.
次に、本発明に係る射出シリンダ圧力閉ループ制御方
法の実施例につき、添付図面を参照しながら以下詳細に
説明する。Next, an embodiment of an injection cylinder pressure closed loop control method according to the present invention will be described in detail with reference to the accompanying drawings.
第１図は、本発明の一実施例を示す射出シリンダ圧力
閉ループ制御方法を説明するブロック回路図であり、従
来例の第２図に示す射出成形機の射出制御に適用するこ
とができる。なお、説明の都合上、第２図に示す構成と
同一の構成部分については、同一の参照符号を付して説
明する。FIG. 1 is a block circuit diagram illustrating an injection cylinder pressure closed loop control method according to an embodiment of the present invention, which can be applied to injection control of an injection molding machine shown in FIG. 2 of a conventional example. For convenience of explanation, the same components as those shown in FIG. 2 will be described with the same reference numerals.
第１図において、射出シリンダ26内の射出側室42およ
び射出戻り側室44はロッド32に連結されている射出ピス
トン30により隔てられており、各室42,44に接続される
圧油の流路には圧力センサS1,S2が設けられる。そし
て、バルブ，ポンプ等の射出シリンダ26の射出動作側油
室の圧力を制御する制御手段52に対して指令信号を送出
する制御回路50が設けられている。次に、このように構
成された回路ブロックによる射出シリンダの圧力閉ルー
プ制御方法を説明する。In FIG. 1, the injection side chamber 42 and the injection return side chamber 44 in the injection cylinder 26 are separated by the injection piston 30 connected to the rod 32. Is provided with pressure sensors S 1 and S 2 . Further, there is provided a control circuit 50 for sending a command signal to a control means 52 for controlling the pressure of the injection operation side oil chamber of the injection cylinder 26 such as a valve or a pump. Next, a method of controlling the pressure of the injection cylinder in a closed loop by the circuit block configured as described above will be described.
制御回路50は先ず、両圧力センサS1,S2によって検出
された射出動作側油室の油圧検出値P1と背圧動作側油室
の油圧検出値P2とを用いて差圧ΔＰ（＝P1−P2）を演算
し、次にこの差圧ΔＰと予め設定しておいた設定値P0と
を比較し、その差分に基づく指令信号を制御手段52へ送
出するよう動作する。この指令信号に基づいてバルブや
ポンプ等の制御手段52は、射出シリンダ26の実質的な射
出力が低下しないよう吐出圧力を調整するよう作動す
る。このため、油温による変化についてもコントロール
下におくことができ、繰返し安定性に優れた制御方法と
なる。The control circuit 50 first, both the pressure sensors S 1, S differential pressure ΔP with the hydraulic detection value P 2 of the hydraulic detection value P 1 and the back pressure operation side oil chamber of the detected injection process side oil chamber by 2 ( = P 1 -P 2 ), and then compares the pressure difference ΔP with a preset value P 0, and sends an instruction signal based on the difference to the control means 52. Based on the command signal, the control means 52 such as a valve and a pump operates to adjust the discharge pressure so that the substantial injection power of the injection cylinder 26 does not decrease. Therefore, the change due to the oil temperature can be controlled, and a control method with excellent repetition stability can be obtained.
前述した実施例から明らかなように、本発明による射
出成形機の射出シリンダ圧力閉ループ制御方法は、可変
吐出ポンプから供給される圧油を切換弁を介して射出シ
リンダに供給して、射出シリンダのピストンロッドを進
退自在に構成し、この射出シリンダのピストンロッドと
連動させてスクリュの進退動作を行って溶融樹脂の射出
制御を行うように構成した射出成形機からなり、射出シ
リンダに対して、射出動作側油室の油圧を検出する第１
のセンサ（S1）と、背圧動作側油室の油圧を検出する第
２のセンサ（S2）と、可変吐出ポンプによる圧油の吐出
圧力を制御する圧力制御手段とを設け、第１のセンサ
（S1）の検出値（P1）と第２のセンサ（S2）の検出値
（P2）との差圧（ΔＰ＝P1−P2）を、射出シリンダの実
質的な射出力が低下しないように予め設定した設定値
（P0）と比較し、前記差圧（ΔＰ）と前記設定値（P0）
との差分に基づいて前記圧力制御手段を制御するよう構
成したことにより、射出成形機の射出速度が速くなる場
合でも、射出シリンダの射出側と背圧側との両圧力検出
値の差圧を使用した閉ループ制御によって圧力制御を行
う方法であるため、油温等の変化に関係なく繰返し安定
性のある射出力を得ることができる。As is apparent from the above-described embodiment, the injection cylinder pressure closed loop control method of the injection molding machine according to the present invention supplies the pressure oil supplied from the variable discharge pump to the injection cylinder through the switching valve, and controls the injection cylinder. It consists of an injection molding machine configured to move the piston rod freely and reciprocate the screw in conjunction with the piston rod of this injection cylinder to control the injection of molten resin. First to detect the oil pressure in the operating oil chamber
(S1), a second sensor (S2) for detecting the oil pressure in the back pressure operating side oil chamber, and pressure control means for controlling the pressure of the pressure oil discharged by the variable discharge pump. The differential pressure (ΔP = P1−P2) between the detection value (P1) of (S1) and the detection value (P2) of the second sensor (S2) is determined in advance so that the substantial injection power of the injection cylinder does not decrease. The differential pressure (ΔP) is compared with the set value (P0) and the set value (P0)
And the pressure control means is controlled based on the difference between the detected pressure and the back pressure side of the injection cylinder, even when the injection speed of the injection molding machine is increased. Since the pressure is controlled by the closed loop control described above, it is possible to repeatedly obtain a stable output regardless of changes in oil temperature or the like.
この圧力閉ループ制御方法は、１次保圧，バイナリー
射出の圧力制御に有効な制御方法である。This pressure closed loop control method is an effective control method for primary pressure holding and pressure control of binary injection.
以上、本発明の好適な実施例について説明したが、本
発明は前記実施例に限定されることなく、本発明の精神
を逸脱しない範囲内において種々の設計変更をなし得る
ことは勿論である。The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it is needless to say that various design changes can be made without departing from the spirit of the present invention.
第１図は本発明に係る射出シリンダ圧力閉ループ制御方
法を説明するブロック回路図、第２図は射出成形機の従
来の射出シリンダ制御方法を説明するための射出成形機
の要部構成図である。 10……バレル、12……ノズル 14……スクリュ、16……回転部材 18……連結部材、20……ホッパ 22……ベアリング、24……油圧モータ 26……射出シリンダ、28……軸受ユニット 30……射出ピストン、32……ロッド 34……二位置切換弁、36……可変吐出ポンプ 38……流量調整弁、40……三位置切換弁 42……射出側室、44……射出戻り側室 46……タンク、48……電磁リリーフ弁 50……制御回路、52……制御手段FIG. 1 is a block circuit diagram illustrating an injection cylinder pressure closed loop control method according to the present invention, and FIG. 2 is a main part configuration diagram of the injection molding machine for explaining a conventional injection cylinder control method of the injection molding machine. . 10 ... Barrel, 12 ... Nozzle 14 ... Screw, 16 ... Rotating member 18 ... Connecting member, 20 ... Hopper 22 ... Bearing, 24 ... Hydraulic motor 26 ... Injection cylinder, 28 ... Bearing unit 30: injection piston, 32: rod 34: two-position switching valve, 36: variable discharge pump 38: flow control valve, 40: three-position switching valve 42: injection side chamber, 44: injection return side chamber 46 …… Tank, 48 …… Electromagnetic relief valve 50 …… Control circuit, 52 …… Control means
Claims (1)
弁を介して射出シリンダに供給して、射出シリンダのピ
ストンロッドを進退自在に構成し、この射出シリンダの
ピストンロッドと連動させてスクリュの進退動作を行っ
て溶融樹脂の射出制御を行うように構成した射出成形機
からなり、 射出シリンダに対して、射出動作側油室の油圧を検出す
る第１のセンサ（S1）と、背圧動作側油室の油圧を検出
する第２のセンサ（S2）と、可変吐出ポンプによる圧油
の吐出圧力を制御する圧力制御手段とを設け、 第１のセンサ（S1）の検出値（P1）と第２のセンサ（S
2）の検出値（P2）との差圧（ΔＰ＝P1−P2）を、射出
シリンダの実質的な射出力が低下しないように予め設定
した設定値（P0）と比較し、前記差圧（ΔＰ）と前記設
定値（P0）との差分に基づいて前記圧力制御手段を制御
することを特徴とする射出成形機の射出シリンダ圧力閉
ループ制御方法。A pressure oil supplied from a variable discharge pump is supplied to an injection cylinder via a switching valve, and a piston rod of the injection cylinder is configured to be able to move forward and backward, and a screw is operated in conjunction with the piston rod of the injection cylinder. A first sensor (S1) for detecting the oil pressure of the oil chamber on the injection operation side with respect to the injection cylinder, and a back pressure for the injection cylinder. A second sensor (S2) for detecting the oil pressure of the operating side oil chamber and pressure control means for controlling a discharge pressure of the pressure oil by the variable discharge pump are provided, and a detection value (P1) of the first sensor (S1) is provided. And the second sensor (S
The differential pressure (ΔP = P1−P2) from the detected value (P2) of (2) is compared with a preset value (P0) set so that the substantial injection power of the injection cylinder does not decrease. ΔP) and the pressure control means are controlled based on a difference between the set value (P0) and the set value (P0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2045757A JP2843633B2 (en) | 1990-02-28 | 1990-02-28 | Injection cylinder pressure closed loop control method for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2045757A JP2843633B2 (en) | 1990-02-28 | 1990-02-28 | Injection cylinder pressure closed loop control method for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03248829A JPH03248829A (en) | 1991-11-06 |
| JP2843633B2 true JP2843633B2 (en) | 1999-01-06 |
Family
ID=12728168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2045757A Expired - Fee Related JP2843633B2 (en) | 1990-02-28 | 1990-02-28 | Injection cylinder pressure closed loop control method for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2843633B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2657352B2 (en) * | 1993-09-08 | 1997-09-24 | 日精樹脂工業株式会社 | Pressure detection method and apparatus for injection molding machine |
| US6464909B1 (en) * | 1998-04-21 | 2002-10-15 | Synventive Molding Solutions, Inc. | Manifold system having flow control |
| US8715547B2 (en) * | 2011-02-24 | 2014-05-06 | Mold-Masters (2007) Limited | Closed loop control of auxiliary injection unit |
| CN111734696B (en) * | 2020-07-02 | 2022-04-08 | 浙江中液机械设备有限公司 | Closed hydraulic system based on closed-loop control and control method |
| CN114311575B (en) * | 2021-12-30 | 2024-03-29 | 阿托斯(上海)液压有限公司 | Injection molding machine back pressure control device and method based on double closed-loop PID regulation |
-
1990
- 1990-02-28 JP JP2045757A patent/JP2843633B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03248829A (en) | 1991-11-06 |
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