JPH02225020A - Method for controlling speed of accumulator type injection and injection molder utilizing the same method - Google Patents
Method for controlling speed of accumulator type injection and injection molder utilizing the same methodInfo
- Publication number
- JPH02225020A JPH02225020A JP4789589A JP4789589A JPH02225020A JP H02225020 A JPH02225020 A JP H02225020A JP 4789589 A JP4789589 A JP 4789589A JP 4789589 A JP4789589 A JP 4789589A JP H02225020 A JPH02225020 A JP H02225020A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- accumulator
- valve
- pressure
- control valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 80
- 239000007924 injection Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 22
- 230000007423 decrease Effects 0.000 claims abstract description 11
- 238000001746 injection moulding Methods 0.000 claims description 13
- 230000004044 response Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
- 239000010720 hydraulic oil Substances 0.000 description 6
- 238000004512 die casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- B29C45/82—Hydraulic or pneumatic circuits
-
- 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
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は射出成形機やダイカストマシンにおいて、アキ
ュムレータによる射出を行うときの速度制御に係るもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to speed control when injection is performed by an accumulator in an injection molding machine or a die casting machine.
プラスチックの射出成形において、薄肉成形品や複雑形
状成形品などでは、キャビティへの充填を素早く行うほ
ど寸法・重量精度の高いものが得られる。またアルミニ
ウムなどのダイカスト鋳造においては、溶融金属が凝固
するまでに素早く充填を完了させなければならない。そ
のような目的のために射出充填工程をアキュムレータ駆
動源ａｍによって行うのが普通である。アキュムレータ
射出により、射出速度は油圧ポンプ（２１）の吐出量だ
けで射出する場合より、約２〜３倍にアップして充填を
素早く行うことができる。In plastic injection molding, for thin-walled molded products or molded products with complex shapes, the faster the cavity is filled, the more accurate the dimensions and weight can be obtained. Furthermore, in die casting of aluminum or the like, filling must be completed quickly before the molten metal solidifies. For such purposes, the injection filling process is usually performed by an accumulator drive source am. Accumulator injection increases the injection speed by about 2 to 3 times compared to injection using only the discharge amount of the hydraulic pump (21), making it possible to perform filling quickly.
しかしアキエムレータ射出のときの射出速度のバラツキ
ということになると、ショットごとのバラツキ率は油圧
ポンプだけの場合より、逆に悪くなることが多い。However, when it comes to variation in injection speed during Achiemulator injection, the variation rate from shot to shot is often worse than in the case of only a hydraulic pump.
アキュムレータ射出のとき、第６図に示すように射出速
度調整弁として、圧力補償付きフローコントロール弁（
２２）を使用した高級なオープン回路としても、射出時
に該フローコントロール弁（２２）を通過する瞬間流量
が大きいので、アキュムレータＣ２１１側の圧力も急激
に低下し、従来のスプリングによる減圧弁（２２ｂ）に
似た構成の圧力補償付きフローコントロール弁（２２）
では、その圧力補償作用が敏速に追従できずに応答遅れ
となり、結果的に射出速度バラツキとなって製品品質と
くに製品重量の安定性が悪くなる。During accumulator injection, a flow control valve with pressure compensation (
22), the instantaneous flow rate passing through the flow control valve (22) at the time of injection is large, so the pressure on the accumulator C211 side also drops rapidly, and the pressure reduction valve (22b) with a conventional spring Flow control valve with pressure compensation (22) of similar construction to
In this case, the pressure compensation effect cannot be followed up quickly, resulting in a delayed response, resulting in injection speed variations and poor product quality, especially product weight stability.
射出速度のバラツキを少なくするため、第７図に示すよ
うに、サーボ弁（２３）を使用して速度フィードバック
による高応答制御を目指しても、溶融樹脂や作動油など
の慣性のため、発振などの不具合が発生し、クローズド
制御のメリットが出てこない、またサーボ弁（２３）を
使用したクローズド制御回路では、使用する作動油はＮ
ＡＳ７ｉ以下にクリーン管理せねばならず、保守上にも
問題があった。In order to reduce variations in injection speed, as shown in Figure 7, even if a servo valve (23) is used to achieve high response control through speed feedback, oscillations etc. may occur due to the inertia of the molten resin and hydraulic oil. In the closed control circuit using the servo valve (23), the hydraulic fluid used is N.
It had to be kept clean to an AS7i level or lower, which caused problems in terms of maintenance.
前述の目的を達成するため、本発明では、射出成形機や
ダイカストマシンでアキュムレータによって射出を行う
時、射出速度調整装置として、弁スプールの開度を弁内
部でフィードバック制御できる比例電磁弁方式の流量方
向制御弁を使用し、アキュムレータ圧力の変化を圧力セ
ンサで電気信号としてマイコン方式制御装置を介して流
量方向制御弁に入力することより、射出速度をクローズ
ド制御と同様の高応答、高精度、高安定度（バラツキ小
）を確保でき、且つ比例電磁弁方式のため作動油の清浄
管理に特別の考慮を払う必要もなく、極めて使い易く、
高精度のアキエムレータ射出速度を制御できる方法と該
方法を利用した射出成形機の提供を目的とするものであ
る。In order to achieve the above-mentioned object, the present invention uses a proportional solenoid valve type flow rate that can feedback-control the valve spool opening degree inside the valve as an injection speed adjustment device when injection is performed by an accumulator in an injection molding machine or a die-casting machine. By using a directional control valve and inputting the change in accumulator pressure as an electric signal using a pressure sensor to the flow rate directional control valve via a microcomputer control device, the injection speed can be controlled with high response, high precision, and high accuracy similar to closed control. Stability (small variation) can be ensured, and since it is a proportional solenoid valve type, there is no need to pay special consideration to cleanliness management of the hydraulic oil, making it extremely easy to use.
The object of the present invention is to provide a method that can control the Akiemulator injection speed with high accuracy and an injection molding machine that uses the method.
本発明方法は上記問題点を解決するために請求項（１）
では；
■ 射出工程でアキュムレータ（３）の圧油を使用する
射出成形において、
■ 比例電磁方式流量制御弁（６）を介してアキュムレ
ータ（３）と射出シリンダ（７）とを接続し、■ 射出
工程におけるアキュムレータ（３）の元圧の低下に合わ
せて弁開度を拡開して行き、射出工程における圧油の弁
通過流量をほぼ一定に保持する。The method of the present invention is provided in claim (1) to solve the above problems.
Then; ■ In injection molding that uses pressure oil from the accumulator (3) in the injection process, ■ The accumulator (3) and the injection cylinder (7) are connected via the proportional electromagnetic flow control valve (6), and ■ The injection The valve opening degree is increased in accordance with the decrease in the source pressure of the accumulator (3) during the process, and the flow rate of pressure oil passing through the valve during the injection process is maintained approximately constant.
；という技術的方法を採用しており、請求項（２）にお
いて、本発明の射出成形機においては、■ 射出成形機
のスクリューまたはプランジャロッドなどの射出部材（
８）駆動用の射出シリンダ（７）と、
■ 射出工程で使用するためのアキュムレータ（３）と
、
■ アキュムレータ（３）から射出シリンダ（７）への
圧油供給量を制御する比例電磁方式流量制御弁（６）と
、
■ 射出工程中のアキュムレータ（３）の元圧低下を検
出する圧力センサ（４）と、
■ 圧力センサ（４）からの信号に基づいて圧油の弁通
過流量が射出工程を通じてほぼ一定になるように比例電
磁方式流量制御弁（６）の弁開度を拡開するマイコン方
式制御装置（５）とで構成する。In claim (2), in the injection molding machine of the present invention, (1) the injection member (such as the screw or plunger rod of the injection molding machine) (
8) Injection cylinder (7) for driving, ■ Accumulator (3) for use in the injection process, ■ Proportional electromagnetic flow rate to control the amount of pressure oil supplied from the accumulator (3) to the injection cylinder (7). A control valve (6), ■ A pressure sensor (4) that detects a drop in the source pressure of the accumulator (3) during the injection process, and ■ A flow rate of pressure oil passing through the valve for injection based on the signal from the pressure sensor (4). It is composed of a microcomputer type control device (5) that widens the valve opening of the proportional electromagnetic type flow control valve (6) so that it remains almost constant throughout the process.
；という技術的手段を採用している。; is adopted as a technical means.
射出を開始し、高速で射出シリンダ（７）のピストン（
７ｃ）が前進し始めると、アキュムレータ（３）の元圧
はこれに応じて降下して行く。そこで射出速度を一定に
保つには流量制御弁（６）の弁開度をアキュムレータ（
３）の元圧降下に比例して拡開して行くようにコントロ
ールする事により射出速度を一定に保つ。Start injection and move the piston (of the injection cylinder (7)) at high speed.
7c) begins to move forward, the source pressure of the accumulator (3) decreases accordingly. Therefore, in order to keep the injection speed constant, the valve opening of the flow control valve (6) should be adjusted to the accumulator (
3) The injection speed is kept constant by controlling it to expand in proportion to the drop in the original pressure.
本発明の実施例を図とともに説明する。 Embodiments of the present invention will be described with reference to the drawings.
第１図、第２図、第３図においては（１）は油圧ポンプ
で、その吐出量口からの管路（ａ）はチエツク弁（２）
に接続されている。（３）はアキュムレータで、チエツ
ク弁（２）の出口側の管路（ｂｌに接続されている。In Figures 1, 2, and 3, (1) is a hydraulic pump, and the pipe (a) from its discharge port is a check valve (2).
It is connected to the. (3) is an accumulator, which is connected to the conduit (bl) on the outlet side of the check valve (2).
通常はガス体を封入するためのゴム袋を内蔵したブラダ
型のものを使用する。（４）はアキュムレータ管路（ｂ
）に装着され、元圧を刻々に測定する油圧センサで、そ
の電気出力は信号線（ｋｌを介してマイコン方式制御装
置（５）に入力されている。管路（ｂ）は比例ｉｔ磁方
式の流量制御弁（６）のＰポートに接続されている。こ
の流量制御弁（６）は、
■ 比例電磁方式の制御弁であるが、その内部は第２図
に示すようにサーボ弁にイ以た構成となっている。ポー
トＰ−＋Ａ、Ｂ−Ｔ間の通過流量を調整するスプール（
６ｆ）は、内蔵された比較増幅器（６ａ）からの正負の
出力線（ホ）、（ｎ）を介して、それぞれトルクモータ
（６ｂ） （６ｃ）によって前進・後退を行い、マイコ
ン方式制御装置（５）からの電気信号線（１）を介して
入力される流量設定電気信号通りに高応答で作動して通
過流量を高精度に調整できる。Usually, a bladder-type device with a built-in rubber bag for sealing the gas is used. (4) is the accumulator pipe (b
) is a hydraulic sensor that measures the source pressure moment by moment, and its electrical output is input to the microcomputer type control device (5) via the signal line (kl).The pipe (b) is a proportional IT magnetic type sensor. The flow control valve (6) is connected to the P port of the flow control valve (6).This flow control valve (6) is a proportional solenoid type control valve, but the inside is connected to the servo valve as shown in Figure 2. It has a spool (
6f) is moved forward and backward by torque motors (6b) and (6c) through positive and negative output lines (e) and (n) from the built-in comparator amplifier (6a), respectively, and is controlled by a microcomputer type control device (6f). 5) operates with high response in accordance with the flow rate setting electric signal inputted via the electric signal line (1), and can adjust the passing flow rate with high precision.
■ また差動トランス（６ｄ）を内蔵しており、スプー
ル前進・後退の動き（弁開度）に比例した、正または負
の電気出力を、電気信号入力端子（６ｅ）にフィードバ
ックしており、弁（６）自身で流量フィードバック機能
をもっている。■ It also has a built-in differential transformer (6d), which feeds back positive or negative electrical output proportional to the forward/backward movement of the spool (valve opening) to the electrical signal input terminal (6e). The valve (6) itself has a flow rate feedback function.
■ しかもサーボ弁の欠点である作動油中のゴミや異物
の影響を受けることが少なく、通常のＮＡＳＩＯ級程度
の作動油が使用可能となり、保守管理し易いという特長
を持っている。■ Moreover, it is less susceptible to the effects of dirt and foreign matter in the hydraulic oil, which is a disadvantage of servo valves, and it has the advantage of being able to use normal NASIO grade hydraulic oil and being easy to maintain.
流量制御弁（６）の出口Ａボートからは、射出シリンダ
（７）のヘッド側（７ａ）に管路（Ｃ１によって接続さ
れる。射出シリンダ（７）のロッド側（７ｂ）からは、
圧油は管路（ｄ）を介してタンクに戻される。射出シリ
ンダ（７）のピストン（７ｃ）の前方には、スクリュー
またはプランジャーロッドなどの射出部材（８）が装着
されている。The outlet A boat of the flow control valve (6) is connected to the head side (7a) of the injection cylinder (7) by a pipe (C1). From the rod side (7b) of the injection cylinder (7),
The pressure oil is returned to the tank via line (d). An injection member (8) such as a screw or a plunger rod is mounted in front of the piston (7c) of the injection cylinder (7).
射出以外の工程では、油圧ポンプ（１）からの圧油でそ
れぞれの作動を行うと同時に、次の射出開始までにアキ
ュムレータ（３）に圧油を保充するチャージ作動も行う
。圧力センサ（４）からの圧力信号がマイコン方式制御
装置（５）の設定器（５ａ）がらの設定圧力値（Ｐｏ）
に等しくなった点でチャージを終える。In processes other than injection, each operation is performed using pressure oil from the hydraulic pump (1), and at the same time, a charging operation is also performed to replenish the accumulator (3) with pressure oil until the start of the next injection. The pressure signal from the pressure sensor (4) is the set pressure value (Po) from the setting device (5a) of the microcomputer type control device (5).
Charging ends at the point where it becomes equal to .
射出工程に入り、アキュムレータ（３）からの圧油が流
量制御弁（６）のポー）Ｐ−＋Ａの流路により射出シリ
ンダ（７）に流入し、射出ピストン（７ｃ）が前進を始
めると、アキュムレータ元圧は第４図の曲線（α）のよ
うに降下してゆく。従って射出シリンダ（７）の射出速
度も設定値（ｖｏ）通りに維持できずに曲線（α′）の
ように降下してゆ（。When the injection process begins, pressure oil from the accumulator (3) flows into the injection cylinder (7) through the flow path of port (P-+A) of the flow control valve (6), and the injection piston (7c) begins to move forward. The accumulator source pressure decreases as shown by the curve (α) in FIG. Therefore, the injection speed of the injection cylinder (7) cannot be maintained at the set value (vo) and falls as shown by the curve (α').
第５図は比例電磁方式の流量制御弁（６）の弁開度ｄｍ
対弁通過流Ｉ Ｑ（１／ｍｉＱの特性図であるが、一般
に油圧弁の通過流量Ｑは公知のように、ここにＱ ：通
過流量
Ａ ：弁開口部面積
γ ：使用作動油の比重
Ｐ、；弁入口圧力
Ｐｚ ：弁出口圧力
△Ｐ＝ＰＩ Ｐｇ：弁差圧
Ｃ：流量計数
である。Figure 5 shows the valve opening dm of the proportional electromagnetic type flow control valve (6).
This is a characteristic diagram of the flow rate through the valve IQ (1/miQ, but as is generally known, the flow rate Q through the hydraulic valve is as follows: Q: Passage flow rate A: Valve opening area γ: Specific gravity P of the hydraulic oil used ,; Valve inlet pressure Pz: Valve outlet pressure ΔP=PI Pg: Valve differential pressure C: Flow rate count.
ここで、本発明に使用する流量制御弁（６）の場合は、
スプール弁構造で、Ａτｄ（ｄは弁開度Ｕ）であるので
、式ｆｉｌは、
Ｃ：比例常数
となる。また差圧△Ｐは略弁入口圧Ｐ、に比例するので
、
となる。Here, in the case of the flow control valve (6) used in the present invention,
Since the spool valve structure is Aτd (d is the valve opening degree U), the formula fil is as follows: C: proportionality constant. Also, since the differential pressure △P is approximately proportional to the valve inlet pressure P, the following equation is obtained.
従って、射出が始まって、アキュムレータ（３）の元圧
すなわち制御弁（６）の入口圧（ＰＩ）が刻々と降下し
てゆくので、第５図の特性線（Ｘｌは（ｙｌまで下がり
、弁通過流量は（Ｑ、）であるべきものが（Ｃ２）
まで低下してしまう。Therefore, when injection starts, the source pressure of the accumulator (3), that is, the inlet pressure (PI) of the control valve (6), decreases moment by moment, so that the characteristic line (Xl in FIG. 5) decreases to (yl), and the valve The passing flow rate should be (Q,) but (C2)
It will drop to.
そこで、本発明ではこれを元の（Ｑ、）まで持ち上げる
ために、特性線（Ｖ）に従って弁開度（ｄｌ）を（ｄ２
） まで大きくしてやる。Therefore, in the present invention, in order to raise this to the original (Q,), the valve opening degree (dl) is adjusted (d2) according to the characteristic line (V).
) I'll make it bigger.
すなわち、アキュムレータ（３）の元圧（Ｐｌ）を圧力
センサ（４）で刻々と測定し、電気信号線（ｋｌを介し
て、マイコン方式制御装置（５）に入力する。That is, the source pressure (Pl) of the accumulator (3) is measured every moment by a pressure sensor (4) and inputted to the microcomputer type control device (5) via an electric signal line (kl).
制御装置（５）では式（３）によって入力（Ｐｌ）が小
さくなった分だけ弁開度（ｄｌを大きくするようにする
。すなわち６１７丁が一定になるように演算する。弁開
度（ｄ）を信号線Ｃ１） を介して流量制御弁（６）
に、入力してやり、通過流量（Ｑ）が低下しないように
保持する。このようにして第４図のようにアキュムレー
タ（３）の元圧が（α）のように下がっても、射出速度
は設定値通り（ＶＯ） （即ち（β）で示すライン）に
保つことができる。In the control device (5), the valve opening degree (dl) is increased by the amount that the input (Pl) becomes smaller according to equation (3). In other words, the calculation is made so that 617 teeth remains constant. ) through the signal line C1) to the flow control valve (6)
The flow rate (Q) is maintained so that the flow rate (Q) does not decrease. In this way, even if the source pressure of the accumulator (3) drops to (α) as shown in Figure 4, the injection speed can be maintained at the set value (VO) (i.e., the line indicated by (β)). can.
本発明方法は請求項（１）に示すように、射出工程でア
キュムレータの圧油を使用する射出成形において、比例
電磁方式流量制御弁を介してアキュムレータと射出シリ
ンダとを接続し、射出工程におけるアキュムレータの元
圧の低下に合わせて弁開度を拡開して行き、射出工程に
おける圧油の弁通過流量をほぼ一定に保持するようにな
っているので、射出を開始し、高速で射出シリンダのピ
ストンが前進するにつれアキュムレータ元圧が低下した
としても元圧低下がコントロールされた弁開度の拡開に
よって補われ、その結果従来問題とされていたアキュム
レータ使用による射出速度のバラツキがなくなり、高速
度成形が高精度、高安定度で行う事が出来、又、射出シ
リンダの圧油供給の制御を比例電磁方式流量制御弁にて
行っているので、作動油の清浄管理に特別の考慮を払う
必要もなく、極めて使い易く、高精度のアキュムレータ
射出速度を制御できるという利点がある。又、請求項（
２）において射出成形機のスクリューまたはプランジャ
ロッドなどの射出部材駆動用の射出シリンダと射出工程
で使用するためのアキュムレータと、アキュムレータか
ら射出シリンダへの圧油供給量を制御する比例電磁方式
流量制御弁と射出工程中のアキュムレータの元圧低下を
検出する圧力センサと、圧力センサからの信号に基づい
て圧油の弁通過流量が射出工程を通じてほぼ一定になる
ように比例電磁方式流量制御弁の弁開度を拡開するマイ
コン方式制御装置とで速度制御型アキュムレータ射出方
式の射出成形機を構成しているので、請求項（１）に記
載の射出方法を実施する事が出来た。As shown in claim (1), the method of the present invention connects an accumulator and an injection cylinder via a proportional electromagnetic flow control valve in injection molding using pressure oil of an accumulator in an injection process, and The valve opening increases as the source pressure decreases, and the flow rate of pressure oil passing through the valve during the injection process is kept almost constant. Even if the accumulator source pressure decreases as the piston moves forward, the decrease in source pressure is compensated for by the controlled expansion of the valve opening.As a result, the conventional problem of variation in injection speed due to the use of an accumulator is eliminated, and high speeds are achieved. Molding can be performed with high precision and stability, and the pressure oil supply to the injection cylinder is controlled by a proportional electromagnetic flow control valve, so special consideration must be taken to manage the cleanliness of the hydraulic oil. It has the advantage of being extremely easy to use and allowing highly accurate control of the accumulator injection speed. In addition, claims (
In 2), an injection cylinder for driving an injection member such as a screw or plunger rod of an injection molding machine, an accumulator for use in the injection process, and a proportional electromagnetic type flow control valve that controls the amount of pressure oil supplied from the accumulator to the injection cylinder. and a pressure sensor that detects a drop in the source pressure of the accumulator during the injection process, and a proportional electromagnetic flow control valve that opens the valve so that the flow rate of pressure oil passing through the valve remains almost constant throughout the injection process based on the signal from the pressure sensor. Since the speed-controlled accumulator injection type injection molding machine is constituted by the microcomputer type control device that expands the speed, the injection method described in claim (1) can be carried out.
第１図・・・本発明の油圧制御回路図
第２図・・・本発明に使用した流量制御弁の詳細回路図
第３図・・・本発明のブロック回路図
第４図・・・射出工程における射出ストローク（Ｘ軸）
とアキュムレータ圧力並びに射出速度（ｙ軸）との関係
を示す特性グラフ
第５図・・・射出工程における流量制御弁の弁拡開度（
Ｘ軸）と圧油の弁通過流量（ｙ軸）との関係を示すグラ
フ
第６図（ａ）・・・圧力補償付きフローコントロール弁
を使用した従来の油圧制御回路図
第６図（ｂｌ・・・第６図（ａ）に対するブロック回路
図第７図（ａｌ・・・サーボ弁を使用した従来の油圧制
御回路図第７図（ｂ）・・・第７図（ａ）のブロック回
路図（１）・・・油圧ポンプ （２）・・・チ
エツク弁（３）・・・アキュムレータ （４）・・
・圧力センサ（５）・・・マイコン方式制御装置 （５
ａ）・・・設定器（６）・・・流量制御弁 （
６ａ）・・・比較増幅器（６ｂ） （６ｃ）・・・トル
クモータ （６ｄ）・・・差動トランス（６ｅ）・・・
電気信号入力端子 （６ｆ）・・・スプール（７）・・
・射出シリンダ （７ａ）・・・ヘッド側（７ｂ
）・・・ロッド側（７ｃ ）・・・ピストン（８）・・
・射出部材
（ａｌ Ｃｂ） （Ｃ） （ｄ） ・・・管路
（ｋ ／ ） ・・・電気信号線（ｌＩ＋） （ｎｌ
・・・電気出力線
特許出願人 東洋機械金属株式会社ＴFigure 1: Hydraulic control circuit diagram of the present invention Figure 2: Detailed circuit diagram of the flow control valve used in the present invention Figure 3: Block circuit diagram of the present invention Figure 4: Injection Injection stroke in the process (X axis)
Figure 5 is a characteristic graph showing the relationship between , accumulator pressure, and injection speed (y-axis)...The valve opening degree of the flow control valve in the injection process (
Graph showing the relationship between the flow rate of pressure oil passing through the valve (y-axis) and the flow rate of pressure oil passing through the valve (y-axis). ...Block circuit diagram for Fig. 6(a) Fig. 7(al)... Conventional hydraulic control circuit diagram using a servo valve Fig. 7(b)...Block circuit diagram of Fig. 7(a) (1)...Hydraulic pump (2)...Check valve (3)...Accumulator (4)...
・Pressure sensor (5)...Microcomputer type control device (5
a)...Setter (6)...Flow rate control valve (
6a)... Comparison amplifier (6b) (6c)... Torque motor (6d)... Differential transformer (6e)...
Electrical signal input terminal (6f)...Spool (7)...
・Injection cylinder (7a)...Head side (7b
)...Rod side (7c)...Piston (8)...
・Injection member (al Cb) (C) (d) ...Pipe line
(k/)...Electric signal line (lI+) (nl
...Electric output line patent applicant: Toyo Machine & Metal Co., Ltd. T
Claims (2)
成形において、比例電磁方式流量制御弁を介してアキュ
ムレータと射出シリンダとを接続し、射出工程における
アキュムレータの元圧の低下に合わせて弁開度を拡開し
て行き、射出工程における圧油の弁通過流量をほぼ一定
に保持する事を特徴とするアキュムレータ射出の速度制
御方法。(1) In injection molding that uses pressure oil from the accumulator in the injection process, the accumulator and injection cylinder are connected via a proportional electromagnetic flow control valve, and the valve opening is adjusted according to the decrease in the source pressure of the accumulator during the injection process. A method for controlling the speed of accumulator injection, characterized in that the flow rate of pressure oil passing through a valve during the injection process is kept almost constant.
などの射出部材駆動用の射出シリンダと、射出工程で使
用するためのアキュムレータと、アキュムレータから射
出シリンダへの圧油供給量を制御する比例電磁方式流量
制御弁と、射出工程中のアキュムレータの元圧低下を検
出する圧力センサと、圧力センサからの信号に基づいて
圧油の弁通過流量が射出工程を通じてほぼ一定になるよ
うに比例電磁方式流量制御弁の弁開度を拡開するマイコ
ン方式制御装置とで構成された事を特徴とする速度制御
型とアキュムレータ射出方式の射出成形機。(2) An injection cylinder for driving injection members such as the screw or plunger rod of an injection molding machine, an accumulator for use in the injection process, and proportional electromagnetic flow control that controls the amount of pressure oil supplied from the accumulator to the injection cylinder. A valve, a pressure sensor that detects a drop in the source pressure of the accumulator during the injection process, and a proportional electromagnetic flow control valve that keeps the flow rate of pressure oil through the valve almost constant throughout the injection process based on the signal from the pressure sensor. A speed control type and accumulator injection type injection molding machine characterized by being configured with a microcomputer type control device that expands the valve opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4789589A JPH02225020A (en) | 1989-02-27 | 1989-02-27 | Method for controlling speed of accumulator type injection and injection molder utilizing the same method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4789589A JPH02225020A (en) | 1989-02-27 | 1989-02-27 | Method for controlling speed of accumulator type injection and injection molder utilizing the same method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02225020A true JPH02225020A (en) | 1990-09-07 |
| JPH0560774B2 JPH0560774B2 (en) | 1993-09-03 |
Family
ID=12788140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4789589A Granted JPH02225020A (en) | 1989-02-27 | 1989-02-27 | Method for controlling speed of accumulator type injection and injection molder utilizing the same method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02225020A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5622217A (en) * | 1994-09-14 | 1997-04-22 | Toshiba Kikai Kabushiki Kaisha | Injection apparatus for a die casting machine |
| EP1314533A1 (en) * | 2001-11-14 | 2003-05-28 | Sumitomo Heavy Industries, Ltd. | Injection molding machine comprising an accumulator for hydraulic oil, and a control method for the injection molding machine |
-
1989
- 1989-02-27 JP JP4789589A patent/JPH02225020A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5622217A (en) * | 1994-09-14 | 1997-04-22 | Toshiba Kikai Kabushiki Kaisha | Injection apparatus for a die casting machine |
| EP1314533A1 (en) * | 2001-11-14 | 2003-05-28 | Sumitomo Heavy Industries, Ltd. | Injection molding machine comprising an accumulator for hydraulic oil, and a control method for the injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0560774B2 (en) | 1993-09-03 |
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