JP3261219B2 - Method and apparatus for switching pressure holding of injection molding machine - Google Patents
Method and apparatus for switching pressure holding of injection molding machineInfo
- Publication number
- JP3261219B2 JP3261219B2 JP17753993A JP17753993A JP3261219B2 JP 3261219 B2 JP3261219 B2 JP 3261219B2 JP 17753993 A JP17753993 A JP 17753993A JP 17753993 A JP17753993 A JP 17753993A JP 3261219 B2 JP3261219 B2 JP 3261219B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- holding
- switching
- mold clamping
- mold
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は直圧式型締装置を有す
る射出成形機の保圧切換方法および装置に関し、特に、
型締シリンダの圧力の測定値を外部に設けた圧力センサ
で検出し、この測定値が予め設定された保圧切換圧と比
較され、比較後の保圧切換信号で切り換えることにより
安価な圧力センサで確実な保圧切換を行うための新規な
改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for switching a holding pressure of an injection molding machine having a direct pressure type mold clamping device.
An inexpensive pressure sensor that detects the measured value of the pressure of the mold clamping cylinder with an externally provided pressure sensor, compares the measured value with a preset holding pressure switching pressure, and switches with the compared holding pressure switching signal The present invention relates to a new improvement for performing reliable pressure holding switching.
【０００２】[0002]
【従来の技術】従来の射出成形機の保圧切換方法は、ス
クリュの位置により行われるのが一般的であり、広く採
用されている。射出成形における保圧切換とは、図５で
説明すると、射出工程で金型２のキャビティ３内に樹脂
が充填された後、冷却に伴う樹脂の収縮分を補充するた
めの圧力を付加する保圧工程への切換を示している。特
に、保圧切換にはキャビティ３内への樹脂の充填状態を
検知することが重要なポイントとなる。2. Description of the Related Art A conventional pressure-holding switching method for an injection molding machine is generally performed depending on the position of a screw, and is widely used. As described with reference to FIG. 5, the holding pressure switching in the injection molding is such that after the resin is filled in the cavity 3 of the mold 2 in the injection process, a pressure for applying a pressure for replenishing the shrinkage of the resin due to cooling is applied. 7 shows a switch to a pressure step. In particular, it is important to detect the filling state of the resin in the cavity 3 for switching the holding pressure.
【０００３】前記スクリュの位置による保圧切換方法は
キャビティ３内に充填する樹脂量を一定にしようとする
ものであるが、可塑化時の樹脂計量のバラツキや逆流防
止リングの封止性能の影響を受けるため、充填量は一定
とならない。そのため、最近では、図５に示すように、
金型キャビティ３内の樹脂圧を金型２内に設置された樹
脂圧センサ８により測定し、その測定値が保圧切換圧力
設定器２４に予め設定された保圧切換樹脂圧を越えたと
き、射出工程から保圧工程に切り換える保圧切換方法
が、提案されている。[0003] The pressure-holding switching method according to the position of the screw is intended to keep the amount of resin filled in the cavity 3 constant. However, the influence of the variation in the resin measurement at the time of plasticization and the sealing performance of the backflow prevention ring. Therefore, the filling amount is not constant. Therefore, recently, as shown in FIG.
The resin pressure in the mold cavity 3 is measured by the resin pressure sensor 8 installed in the mold 2, and when the measured value exceeds the resin pressure set by the pressure holding switching pressure setter 24. There has been proposed a pressure-hold switching method for switching from the injection process to the pressure-holding process.
【０００４】[0004]
【発明が解決しようとする課題】従来の射出成形機の保
圧切換方法は、以上のように構成されていたため、次の
ような課題が存在していた。すなわち、従来の樹脂圧セ
ンサ８によるキャビティ３内の樹脂圧を測定する方法で
は、図５に示すように、金型２に樹脂圧センサ８を設置
するために、可動盤９に特別な加工が必要であるという
問題点があった。また、１つの樹脂圧センサ８で測定可
能なのはキャビティ３内の１ケ所であるが、金型２のキ
ャビティ３内の樹脂圧はゲートからの距離、肉厚等によ
り異なり、キャビティ３のどの場所に樹脂圧センサ８を
設置するかが重要なポイントとなるが、この設置場所の
決定は困難であった。もし設置場所が適切でない場合に
は、保圧切換を目的として樹脂圧測定しても意味の無い
ものとなっていた。Since the conventional pressure-holding switching method for an injection molding machine is configured as described above, the following problems exist. That is, in the conventional method of measuring the resin pressure in the cavity 3 by the resin pressure sensor 8, as shown in FIG. There was a problem that it was necessary. Although one resin pressure sensor 8 can measure only one location in the cavity 3, the resin pressure in the cavity 3 of the mold 2 varies depending on the distance from the gate, the wall thickness, and the like. An important point is whether to install the resin pressure sensor 8, but it is difficult to determine the installation location. If the installation location is not appropriate, it has become meaningless to measure the resin pressure for the purpose of switching the holding pressure.
【０００５】本発明は、以上のような課題を解決するた
めになされたもので、特に、型締シリンダの圧力の測定
値を外部に設けた圧力センサで検出し、この測定値が予
め設定された保圧切換圧と比較され、比較後の保圧切換
信号で切換えることにより安価な圧力センサで確実な保
圧切換を行うようにした射出成形機の保圧切換方法およ
び装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In particular, a measured value of the pressure of a mold clamping cylinder is detected by an externally provided pressure sensor, and the measured value is set in advance. And a method and a device for switching the pressure of the injection molding machine, which can be switched with a reduced pressure switching signal after the comparison, and can be reliably switched with an inexpensive pressure sensor. Aim.
【０００６】[0006]
【課題を解決するための手段】本発明による射出成形機
の保圧切換方法は、直圧式型締装置を有する射出成形機
において、予め設定された初期型締力で型締を行い、射
出工程中に金型内樹脂圧により発生する型開力に抗して
可動盤の位置を保持できるよう型締シリンダの油圧力を
制御し、前記可動盤の位置保持のために上昇する油圧力
を前記型締シリンダに接続された圧力センサにより測定
値として測定し、保圧切換圧力設定器により予め設定さ
れた保圧切換圧と前記測定値を前記圧力センサと保圧切
換圧力設定器に接続された比較器により比較し、前記測
定値が保圧切換圧より大きくなった時に射出工程から保
圧工程に切り替える方法であり、また、本発明による射
出成形機の保圧切換装置は、直圧式型締装置を有する射
出成形機において、予め設定された初期型締力で型締を
行い、射出工程中に金型内樹脂圧により発生する型開力
に抗して可動盤の位置を保持できるよう型締シリンダの
油圧力を制御するため方向制御弁に接続された圧力制御
弁と、前記可動盤の位置保持のための圧力指令信号を前
記圧力制御弁に送るためメインコントローラに接続され
た位置保持コントローラと、前記可動盤の位置を測定す
る位置センサと、前記可動盤の位置保持のために上昇す
る型締シリンダの油圧力を測定するため前記型締シリン
ダに設けられた圧力センサと、前記測定値と保圧切換圧
力設定器からの保圧切換圧が入力され前記メインコント
ローラに接続された比較器とを備え、前記測定値と前記
保圧切換圧とを前記比較器で比較し前記測定値が前記保
圧切換圧より大きくなった時に前記比較器から保圧切換
信号を前記メインコントローラに入力して射出工程から
保圧工程に切り換えるようにした構成である。SUMMARY OF THE INVENTION According to the present invention, there is provided a method for switching a holding pressure of an injection molding machine, comprising the steps of: using an injection molding machine having a direct pressure type mold clamping device, performing mold clamping with a preset initial clamping force; The hydraulic pressure of the mold clamping cylinder is controlled so that the position of the movable platen can be held against the mold opening force generated by the resin pressure in the mold, and the hydraulic pressure rising for holding the position of the movable platen The measured value was measured by a pressure sensor connected to the mold clamping cylinder, and the holding pressure switching pressure and the measured value set in advance by the holding pressure switching pressure setting device were connected to the pressure sensor and the holding pressure switching pressure setting device. This is a method of switching from the injection step to the holding pressure step when the measured value is larger than the holding pressure switching pressure by comparing with a comparator, and the holding pressure switching device of the injection molding machine according to the present invention is a direct pressure type mold clamping. Injection molding machine with equipment The mold clamping is performed with a preset initial mold clamping force, and the hydraulic pressure of the mold clamping cylinder is controlled so that the position of the movable platen can be maintained against the mold opening force generated by the resin pressure in the mold during the injection process. A pressure control valve connected to a direction control valve, a position holding controller connected to a main controller to send a pressure command signal for holding a position of the movable plate to the pressure control valve, and a position of the movable plate. A position sensor to be measured, a pressure sensor provided in the mold clamping cylinder to measure the hydraulic pressure of the mold clamping cylinder that rises to maintain the position of the movable platen, and a measurement value and a holding pressure switching pressure setting device. And a comparator connected to the main controller, wherein the measured value is compared with the holding pressure switching pressure, and the measured value is larger than the holding pressure switching pressure. Said when It is a structure in which to switch the pressure holding process from the injection process to hold pressure signal is input to the main controller from 較器.
【０００７】[0007]
【作用】本発明による射出成形機の保圧切換方法および
装置における射出・保圧工程中の金型内樹脂圧の挙動は
図２に示すとおりであり、この樹脂圧により金型２を開
けようとする力である型開力Ａが発生する。この型開力
Ａの挙動は金型内樹脂圧とほぼ同一の挙動を示し、図３
となる。この型開力Ａに抗して可動盤９の位置を保持す
るためには型締シリンダ１の油圧力を増加させなければ
ならず、この油圧力の挙動は、型開力Ａの挙動すなわち
金型内樹脂圧の挙動と同一であり、図４に示すとおりと
なる。従って、この型締シリンダ内圧力の測定値と予め
設定された保圧切換圧とを比較し、得られた保圧切換信
号によって射出工程を保圧工程に切換える。FIG. 2 shows the behavior of the resin pressure in the mold during the injection and pressure-holding step in the method and the apparatus for switching the holding pressure of the injection molding machine according to the present invention. A mold opening force A is generated. The behavior of the mold opening force A shows almost the same behavior as the resin pressure in the mold.
Becomes In order to maintain the position of the movable platen 9 against the mold opening force A, the hydraulic pressure of the mold clamping cylinder 1 must be increased. This is the same as the behavior of the in-mold resin pressure, and is as shown in FIG. Therefore, the measured value of the pressure in the mold clamping cylinder is compared with a preset pressure-holding switching pressure, and the injection process is switched to the pressure-holding process based on the obtained pressure-holding switching signal.
【０００８】[0008]
【実施例】以下、図面と共に本発明による射出成形機の
保圧切換方法および装置の好適な実施例を図面に基づい
て詳細に説明する。図１は本発明の油圧回路図および制
御機器配線図を示した図であり、通常の直圧式型締装置
に、予め設定された初期型締力で型締を行った時、射出
工程中に金型内樹脂圧により発生する型開力Ａに抗して
可動盤９の位置を保持できるよう型締シリンダ１の油圧
力を制御する圧力制御弁１３と、位置保持のための圧力
指令信号２１を前記圧力制御弁１３に送る位置保持コン
トローラ２０と、前記可動盤９の位置を測定する位置セ
ンサ１０と、前記可動盤９の位置保持のために上昇する
型締シリンダ１の油圧力を測定する圧力センサ１４と、
射出工程から保圧工程に切換えるための保圧切換圧２４
ａを設定する保圧切換圧力設定器２４と、前記油圧力の
測定値１４ａと前記保圧切換圧２４ａとを比較し油圧力
の測定値１４ａが保圧切換圧２４ａより大きくなった時
に保圧切換信号２３ａを射出成形機の制御装置であるメ
インコントローラ２２に送る比較器２３とを設置したも
のである。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of a method and an apparatus for maintaining a pressure of an injection molding machine according to the present invention. FIG. 1 is a diagram showing a hydraulic circuit diagram and a wiring diagram of a control device according to the present invention. When a normal direct pressure type mold clamping device performs mold clamping with a preset initial mold clamping force, during an injection process, FIG. A pressure control valve 13 for controlling the hydraulic pressure of the mold clamping cylinder 1 so that the position of the movable platen 9 can be held against the mold opening force A generated by the resin pressure in the mold, and a pressure command signal 21 for holding the position. , A position sensor 10 that measures the position of the movable platen 9, and a hydraulic pressure of the mold clamping cylinder 1 that rises to maintain the position of the movable platen 9. A pressure sensor 14,
Holding pressure switching pressure 24 for switching from the injection process to the holding pressure process
a, and compares the measured value 14a of the hydraulic pressure with the maintained pressure switching pressure 24a. When the measured value 14a of the hydraulic pressure becomes larger than the maintained pressure switching pressure 24a, the pressure is maintained. It is provided with a comparator 23 for sending a switching signal 23a to a main controller 22 which is a control device of the injection molding machine.
【０００９】前記メインコントローラ２２は射出成形機
本体を制御しており、本発明においては前記位置保持コ
ントローラ２０に初期型締力の指令を出し、比較器２３
から保圧切換信号２３ａを受取り保圧切換を行うように
構成されている。さらに、一対の弁１８ａ、１８ｂを有
する方向制御弁１８は型開閉工程の制御に使用される。The main controller 22 controls the main body of the injection molding machine. In the present invention, the main controller 22 issues an instruction for the initial mold clamping force to the position holding controller 20 and outputs a command to the comparator 23.
, And receives the pressure-holding switching signal 23a. Further, a directional control valve 18 having a pair of valves 18a and 18b is used for controlling a mold opening and closing process.
【００１０】本発明による射出成形機の保圧切換装置
は、前述したように構成されており、以下にその動作に
ついて説明する。まず、初期型締力の指令を、前記メイ
ンコントローラ２２から位置保持コントローラ２０を介
して圧力制御弁１３に送り型締を行う。その時の可動盤
９の位置を位置センサ１０で検出し、その位置を示す位
置信号１０ａを位置保持コントローラ２０に送り、位置
保持コントローラ２０はその位置を保持するような型締
シリンダ１の油圧力を演算し、その圧力指令信号２１を
圧力制御弁１３に送る。The holding pressure switching device of the injection molding machine according to the present invention is configured as described above, and the operation thereof will be described below. First, a command for an initial mold clamping force is sent from the main controller 22 to the pressure control valve 13 via the position holding controller 20 to perform mold clamping. The position of the movable platen 9 at that time is detected by the position sensor 10, and a position signal 10a indicating the position is sent to the position holding controller 20, and the position holding controller 20 detects the hydraulic pressure of the mold clamping cylinder 1 to hold the position. Calculation is performed and the pressure command signal 21 is sent to the pressure control valve 13.
【００１１】この状態で射出工程に入ると、金型内樹脂
圧により型開力Ａが発生する。この型開力Ａは型締シリ
ンダ１に外力として働き、可動盤９の位置を変えようと
するが、位置保持コントローラ２０により型締完了時の
位置を保持するように、型締シリンダ１の油圧力が制御
されているため、可動盤９の位置は変化せず、型締シリ
ンダ１の油圧力は可動盤９の位置保持のため、型開力Ａ
に対応して変化してゆく。図２に金型内樹脂力の挙動、
図３に型開力の挙動、図４に型締シリンダ内油圧力の挙
動を示す。金型内樹脂圧はキャビティ３に樹脂が完全に
充填される時点が最も高くなり、その時に射出工程か
ら、圧力制御である保圧工程に切り換わらなければなら
ない。When the injection process is started in this state, a mold opening force A is generated by the resin pressure in the mold. The mold opening force A acts as an external force on the mold clamping cylinder 1 and attempts to change the position of the movable platen 9, but the position holding controller 20 controls the oil of the mold clamping cylinder 1 so as to maintain the position at the time of mold clamping completion. Since the pressure is controlled, the position of the movable platen 9 does not change, and the hydraulic pressure of the mold clamping cylinder 1 maintains the position of the movable platen 9, so that the mold opening force A
Changes in response to Figure 2 shows the behavior of the resin force in the mold,
FIG. 3 shows the behavior of the mold opening force, and FIG. 4 shows the behavior of the hydraulic pressure in the mold clamping cylinder. The resin pressure in the mold becomes highest when the cavity 3 is completely filled with the resin. At that time, the injection process has to be switched to a pressure-holding process as pressure control.
【００１２】本発明では、金型内樹脂圧と同一の挙動を
示す型締シリンダ１の油圧力を圧力センサ１４で測定し
その測定値１４ａと、予め前記保圧切換圧力設定器２４
に設定された保圧切換圧力を示す保圧切換圧２４ａと
を、比較器２３で比較する。前記測定値１４ａが保圧切
換圧２４ａより高くなった時点で、保圧切換信号２３ａ
をメインコントローラ２２に送り、射出工程から保圧工
程に制御を切り換える。In the present invention, the hydraulic pressure of the mold clamping cylinder 1, which exhibits the same behavior as the resin pressure in the mold, is measured by the pressure sensor 14, and the measured value 14a is determined in advance by the pressure-holding switching pressure setting device 24.
Is compared by the comparator 23 with the holding pressure switching pressure 24a indicating the holding pressure switching pressure set in the above. When the measured value 14a becomes higher than the pressure-holding switching pressure 24a, the pressure-holding switching signal 23a
To the main controller 22 to switch the control from the injection process to the pressure-holding process.
【００１３】[0013]
【発明の効果】以上説明してきたように、本発明によれ
ば、金型を改造することなく、通常使用しているすべて
の金型で、高価な樹脂圧センサを使用しなくても、安価
な圧力センサで、容易に保圧切換ができる。又、本発明
では成形品全体の樹脂圧の総和を知ることにより、従来
法での樹脂圧センサの設定場所のみ測定するという、局
部的な測定による不確定な制御を解消することができ
る。As described above, according to the present invention, it is possible to reduce the cost of using all the dies which are normally used without using expensive resin pressure sensors without modifying the dies. With a simple pressure sensor, the pressure can be easily switched. Further, in the present invention, by knowing the sum of the resin pressures of the entire molded article, it is possible to eliminate the uncertain control by the local measurement of measuring only the setting position of the resin pressure sensor in the conventional method.
【図１】本発明による射出成形機の保圧切換方法および
装置を示す油圧回路図および制御機器配線図である。FIG. 1 is a hydraulic circuit diagram and a control device wiring diagram showing a method and a device for switching a pressure holding of an injection molding machine according to the present invention.
【図２】図１の金型内樹脂圧の挙動を示した特性図であ
る。FIG. 2 is a characteristic diagram showing a behavior of a resin pressure in a mold of FIG. 1;
【図３】図１の型開力の挙動を示した特性図である。FIG. 3 is a characteristic diagram showing a behavior of a mold opening force of FIG. 1;
【図４】図１の型締シリンダ内油圧力の挙動を示した特
性図である。FIG. 4 is a characteristic diagram showing a behavior of a hydraulic pressure in a mold clamping cylinder of FIG. 1;
【図５】従来の樹脂圧センサによる金型内樹脂圧力の検
出を利用した保圧切換制御の制御配線図である。FIG. 5 is a control wiring diagram of a pressure-holding switching control utilizing detection of a resin pressure in a mold by a conventional resin pressure sensor.
１・・・型締シリンダ ２・・・金型 ３・・・キャビティ ４・・・射出装置 ７・・・エジェクタピン ８・・・樹脂圧センサ ９・・・可動盤 １０・・・位置センサ １３・・・圧力制御弁 １４・・・圧力センサ １７・・・油圧供給源 １８・・・方向制御弁 ２０・・・位置保持コントローラ ２２・・・メインコントローラ ２３・・・比較器 ２４・・・保圧切換圧力設定器 Ａ・・・型開力 １０ａ・・・位置信号 １４ａ・・・測定値 ２１・・・圧力指令信号 ２３ａ・・・保圧切換信号 ２４ａ・・・保圧切換圧 REFERENCE SIGNS LIST 1 mold clamping cylinder 2 mold 3 cavity 4 injection device 7 ejector pin 8 resin pressure sensor 9 movable plate 10 position sensor 13 ... Pressure control valve 14 ... Pressure sensor 17 ... Hydraulic supply source 18 ... Direction control valve 20 ... Position holding controller 22 ... Main controller 23 ... Comparator 24 ... Hold Pressure switching pressure setter A: mold opening force 10a: position signal 14a: measured value 21: pressure command signal 23a: holding pressure switching signal 24a: holding pressure switching pressure
Claims (2)
いて、予め設定された初期型締力で型締を行い、射出工
程中に金型(2)内樹脂圧により発生する型開力(A)に抗し
て可動盤(9)の位置を保持できるよう型締シリンダ(1)の
油圧力を制御し、前記可動盤(9)の位置保持のために上
昇する油圧力を前記型締シリンダ(1)に接続された圧力
センサ(14)により測定値(14a)として測定し、保圧切換
圧力設定器(24)により予め設定された保圧切換圧(24a)
と前記測定値(14a)を前記圧力センサ(14)と保圧切換圧
力設定器(24)に接続された比較器(23)により比較し、前
記測定値(14a)が保圧切換圧(24a)より大きくなった時に
射出工程から保圧工程に切り替えることを特徴とする射
出成形機の保圧切換方法。In an injection molding machine having a direct pressure type mold clamping device, the mold is clamped with a preset initial mold clamping force, and a mold opening force generated by a resin pressure in a mold (2) during an injection process. The hydraulic pressure of the mold clamping cylinder (1) is controlled so that the position of the movable platen (9) can be held against the position of the movable platen (9). Measured by the pressure sensor (14) connected to the cylinder (1) as the measured value (14a), and the holding pressure switching pressure (24a) preset by the pressure holding switching pressure setter (24)
And the measured value (14a) are compared by the comparator (23) connected to the pressure sensor (14) and the holding pressure switching pressure setting device (24), and the measured value (14a) is compared with the holding pressure switching pressure (24a ) A pressure-holding switching method for an injection molding machine, wherein the pressure is switched from an injection process to a pressure-holding process when the pressure becomes larger.
いて、予め設定された初期型締力で型締を行い、射出工
程中に金型(2)内樹脂圧により発生する型開力(A)に抗し
て可動盤(9)の位置を保持できるよう型締シリンダ(1)の
油圧力を制御するため方向制御弁(18)に接続された圧力
制御弁(13)と、前記可動盤(9)の位置保持のための圧力
指令信号(21)を前記圧力制御弁(13)に送るためメインコ
ントローラ(22)に接続された位置保持コントローラ(20)
と、前記可動盤(9)の位置を測定する位置センサ(10)
と、前記可動盤(9)の位置保持のために上昇する型締シ
リンダ(1)の油圧力を測定するため前記型締シリンダ(1)
に設けられた圧力センサ(14)と、前記測定値(14a)と保
圧切換圧力設定器(24)からの保圧切換圧(24a)が入力さ
れ前記メインコントローラ(22)に接続された比較器(23)
とを備え、前記測定値(14a)と前記保圧切換圧(24a)とを
前記比較器(23)で比較し前記測定値(14a)が前記保圧切
換圧(24a)より大きくなった時に前記比較器(23)から保
圧切換信号(23a)を前記メインコントローラ(22)に入力
して射出工程から保圧工程に切り換えるように構成した
ことを特徴とする射出成形機の保圧切換装置。2. In an injection molding machine having a direct pressure type mold clamping device, mold clamping is performed with a preset initial mold clamping force, and a mold opening force generated by a resin pressure in a mold (2) during an injection process. A pressure control valve (13) connected to a direction control valve (18) for controlling the hydraulic pressure of the mold clamping cylinder (1) so as to maintain the position of the movable platen (9) against A); A position holding controller (20) connected to a main controller (22) to send a pressure command signal (21) for holding the position of the panel (9) to the pressure control valve (13)
And a position sensor (10) for measuring the position of the movable platen (9).
And the mold clamping cylinder (1) for measuring the hydraulic pressure of the mold clamping cylinder (1) that rises to maintain the position of the movable platen (9).
The pressure sensor (14) provided in the controller and the measured value (14a) and the holding pressure switching pressure (24a) from the holding pressure switching pressure setting device (24) are inputted and compared with the main controller (22). Table (23)
The measured value (14a) and the holding pressure switching pressure (24a) are compared by the comparator (23), and when the measured value (14a) becomes larger than the holding pressure switching pressure (24a). A pressure-holding switching device for an injection molding machine, wherein a pressure-holding switching signal (23a) is input from the comparator (23) to the main controller (22) to switch from an injection process to a pressure-holding process. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17753993A JP3261219B2 (en) | 1993-06-25 | 1993-06-25 | Method and apparatus for switching pressure holding of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17753993A JP3261219B2 (en) | 1993-06-25 | 1993-06-25 | Method and apparatus for switching pressure holding of injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH079517A JPH079517A (en) | 1995-01-13 |
| JP3261219B2 true JP3261219B2 (en) | 2002-02-25 |
Family
ID=16032717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17753993A Expired - Fee Related JP3261219B2 (en) | 1993-06-25 | 1993-06-25 | Method and apparatus for switching pressure holding of injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3261219B2 (en) |
-
1993
- 1993-06-25 JP JP17753993A patent/JP3261219B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH079517A (en) | 1995-01-13 |
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