JPH0560774B2 - - Google Patents
Info
- Publication number
- JPH0560774B2 JPH0560774B2 JP4789589A JP4789589A JPH0560774B2 JP H0560774 B2 JPH0560774 B2 JP H0560774B2 JP 4789589 A JP4789589 A JP 4789589A JP 4789589 A JP4789589 A JP 4789589A JP H0560774 B2 JPH0560774 B2 JP H0560774B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- accumulator
- valve
- pressure
- flow rate
- 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
- 238000002347 injection Methods 0.000 claims description 75
- 239000007924 injection Substances 0.000 claims description 75
- 238000000034 method Methods 0.000 claims description 27
- 238000001746 injection moulding Methods 0.000 claims description 14
- 230000007423 decrease Effects 0.000 claims description 10
- 239000003921 oil Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 239000010720 hydraulic oil Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 101100459772 Caenorhabditis elegans nas-10 gene Proteins 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 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
- 229910052751 metal Inorganic materials 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
- 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)
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、アキユ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.
プラスチツ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、キヤビテイへの充填
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ユムレータ駆動源２
０によつて行うのが普通である。アキユムレータ
射出により、射出速度は油圧ポポンプ２１の吐出
量だけで射出する場合より、約２〜３倍にアツプ
して充填を素早く行うことができる。
In plastic injection molding, for thin-walled products or 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 carried out using an accumulator drive source 2.
It is common to use 0. By using the accumulator injection, the injection speed can be increased to about 2 to 3 times compared to the case where the injection is performed using only the discharge amount of the hydraulic pop pump 21, and filling can be performed quickly.
しかしアキユ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、シヨツトごとのバ
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 accumulator injection, the variation rate from shot to shot is often worse than in the case of only a hydraulic pump.
アキユ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、アキユムレー
タ２０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つて製品品質とくに製品
重量の安定性が悪くなる。 At the time of injection of the accumulator, as shown in FIG.
Since the instantaneous flow rate passing through is large, the pressure on the accumulator 20 side also drops rapidly, and the flow control valve 22 with pressure compensation, which has a configuration similar to the conventional pressure reducing valve 22b using a spring, cannot quickly follow the pressure compensation action. This results in a delay in response and, as a result, variation in injection speed, resulting in poor product quality, especially stability in product weight.
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を使用して速度フイ
ードバツ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ツトが出てこ
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NAS7級以下にク
リーン管理せねばならず、保守上にも問題があつ
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, problems such as oscillation may occur due to the inertia of the molten resin and hydraulic oil. occurs, and the benefits of closed control are not realized. In addition, in the closed control circuit using the servo valve 23, the hydraulic oil used must be kept clean to NAS class 7 or below, which poses maintenance problems.
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ユムレータによ
つて射出を行う時、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イードツク制御でき
る比例電磁弁方式の流量方向制御弁を使用し、ア
キユ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により、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、高精度のアキユムレータ射
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 object, the present invention provides a proportional solenoid valve system that can feed-control the opening degree of the valve spool inside the valve as an injection speed adjustment device when injection is performed using an accumulator in an injection molding machine or a die-casting machine. By using a flow rate directional control valve, changes in the accumulator pressure are input to the flow rate directional control valve via a microcomputer control device as an electric signal using a pressure sensor, and the injection speed can be controlled with high response and precision similar to closed control. , a method that can ensure high stability (small variation), and because it is a proportional solenoid valve system, there is no need to pay special consideration to the cleanliness management of the hydraulic oil, is extremely easy to use, and can control the accumulator injection speed with high accuracy. The object of the present invention is to provide an injection molding machine using 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；
射出工程でアキユムレータ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を介してアキユム
レータ３と射出シリンダ７とを接続し、
射出成形工程におけるアキユムレータ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。
In order to solve the above-mentioned problems, the method of the present invention is as follows: In injection molding in which pressure oil from an accumulator 3 is used in the injection process, the accumulator 3 and the injection cylinder 7 are connected via a proportional electromagnetic flow control valve 6. The valve opening degree is increased in accordance with the decrease in the source pressure of the accumulator 3 during the injection molding 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ユーまたはプランジヤロ
ツドなどの射出部材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ユムレータ３
と、
アキユムレータ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、
射出工程中のアキユムレータ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, the injection molding machine of the present invention includes an injection cylinder 7 for driving an injection member 8 such as a screw or a plunger rod of the injection molding machine.
and accumulator 3 for use in the injection process.
and a proportional electromagnetic flow control valve 6 that controls the amount of pressure oil supplied from the accumulator 3 to the injection cylinder 7.
, a pressure sensor 4 that detects a drop in the source pressure of the accumulator 3 during the injection process, and proportional electromagnetic flow control so that the flow rate of pressure oil passing through the valve is approximately constant throughout the injection process based on the signal from the pressure sensor 4. It is composed of a microcomputer type control device 5 that increases the opening degree of the valve 6.
；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、アキユムレータ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の弁開度をアキユ
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。
When injection is started and the piston 7c of the injection cylinder 7 begins to move forward at high speed, the source pressure of the accumulator 3 decreases accordingly. Therefore, in order to keep the injection speed constant, the opening degree of the flow rate control valve 6 is controlled to increase in proportion to the drop in the base pressure of the accumulator 3, thereby keeping the injection speed constant.
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はアキユムレータで、チ
エツク弁２の出口側の管路ｂに接続されている。
通常はガス体を封入するためのゴム袋を内蔵した
プラダ型のものを使用する。４はアキユムレータ
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ｋ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
例電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似た構成となつ
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、内蔵された比増幅器
６ａからの正負の出力線ｍ，ｎを介して、それ
ぞれトルクモータ６ｂ，６ｃによつて前進・後
退を行い、マイコン方式制御装置５からの電気
信号線ｌ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。 In FIGS. 1, 2, and 3, reference numeral 1 denotes a hydraulic pump, and a pipe line a from its discharge port is connected to a check valve 2. In FIG. Reference numeral 3 denotes an accumulator, which is connected to the conduit b on the outlet side of the check valve 2.
Usually, a Prada-type device with a built-in rubber bag for sealing the gas is used. Reference numeral 4 denotes a hydraulic pressure sensor which is attached to the accumulator conduit b and measures the source pressure moment by moment, and its electrical output is input to the microcomputer type control device 5 via a signal line k. Pipe line b is connected to the P port of a proportional electromagnetic type flow control valve 6. The flow rate control valve 6 is a proportional electromagnetic type control valve, but its interior has a structure similar to a servo valve as shown in FIG. The spool 6f that adjusts the flow rate passing between ports P→A and B→T is moved forward and backward by torque motors 6b and 6c, respectively, via positive and negative output lines m and n from a built-in ratio amplifier 6a. It operates with high response in accordance with the flow rate setting electric signal inputted via the electric signal line 1 from the microcomputer type control device 5, and the passing flow rate can be adjusted 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６
ｅにフイードバツクしており、弁６自身で流量
フイードバツク機能をもつている。 It also has a built-in differential transformer 6d, which is proportional to the forward and backward movement of the spool (valve opening).
Positive or negative electrical output, electrical signal input terminal 6
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
NAS10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つている。 Moreover, it is less affected by dust and foreign matter in the hydraulic oil, which is the disadvantage of servo valves, and it is
It has the advantage of being able to use hydraulic oil of about NAS10 class and being easy to maintain.
流量制御弁６の出口Ａポートからは、射出シリ
ンダ７のヘツド側７ａに管路ｃによつて接続され
る。射出シリンダ７のロツド側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、スクリユーまた
はプランジヤーロツドなどの射出部材８が装着さ
れている。 The outlet A port of the flow rate control valve 6 is connected to the head side 7a of the injection cylinder 7 by a conduit c. From the rod side 7b of the injection cylinder 7, the pressure oil is returned to the tank via the 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
までにアキユムレータ３に圧油を保充するチヤー
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からの設定圧
力値P0に等しくなつた点でチヤージを終える。 In processes other than injection, each operation is performed using pressure oil from the hydraulic pump 1, and at the same time, a charge operation is also performed to replenish the accumulator 3 with pressure oil until the start of the next injection. Charging ends when the pressure signal from the pressure sensor 4 becomes equal to the set pressure value P 0 from the setting device 5a of the microcomputer control device 5.
射出工程に入り、アキユムレータ３からの圧油
が流量制御弁６のポート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、アキユムレータ元圧は第４図の曲線α
のように降下してゆく。従つて射出シリンダ７の
射出速度も設定値（V0）通りに維持できずに曲
線α′のように降下してゆく。 When the injection process begins, the pressure oil from the accumulator 3 flows into the injection cylinder 7 through the flow path from port P to A of the flow control valve 6, and when the injection piston 7c starts moving forward, the accumulator source pressure changes to the curve shown in Fig. 4. α
It descends like this. Therefore, the injection speed of the injection cylinder 7 cannot be maintained at the set value (V 0 ) and falls as indicated 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
ｄmm対弁通過流量Ｑ（ｌ／min）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
P1：弁入口圧力
P2：弁出口圧力
△Ｐ＝P1−P2：弁差圧
Ｃ ：流量計数
である。 FIG. 5 is a characteristic diagram of the valve opening dmm of the proportional electromagnetic type flow rate control valve 6 versus the valve passing flow rate Q (l/min), but as is generally known, the passing flow rate Q of a hydraulic valve is: Here, Q: Passing flow rate A: Valve opening area γ: Specific gravity of hydraulic oil used P 1 : Valve inlet pressure P 2 : Valve outlet pressure ΔP=P 1 −P 2 : 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、Ａ〓ｄ（ｄは弁開度mm）
であるので、式(1)は、
Ｑ＝C′d√〓 ……(2)
Ｃ：比例常数
となる。また差圧△Ｐは略弁入口圧P1に比例す
るので、
Ｑ＝C″d√1 ……(3)
となる。 Here, in the case of the flow control valve 6 used in the present invention, it has a spool valve structure, and A〓d (d is the valve opening degree mm).
Therefore, equation (1) becomes Q=C'd√〓...(2) C: proportionality constant. Also, since the differential pressure △P is approximately proportional to the valve inlet pressure P 1 , Q=C″d√ 1 ……(3).
従つて、射出が始まつて、アキユムレータ３の
元圧すなわち制御弁６の入口圧P1が刻々と降下
してゆくので、第５図の特性線ｘはｙまで下が
り、弁通過流量はQ1であるべきものがQ2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 P1 of the control valve 6, decreases moment by moment, so the characteristic line x in FIG. 5 decreases to y, and the flow rate passing through the valve becomes Q1. What should be Q drops to 2 .
そこで、本発明ではこれを元のQ1まで持ち上
げるために、特性線ｙに従つて弁開度d1をd2まで
大きくしてやる。 Therefore, in the present invention, in order to raise this to the original Q1 , the valve opening degree d1 is increased to d2 according to the characteristic line y.
すなわち、アキユムレータ３の元圧P1を圧力
センサ４で刻々を測定し、電気信号線ｋ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 P1 of the accumulator 3 is measured every moment by the pressure sensor 4, and is inputted to the microcomputer type control device 5 via the electric signal line k.
制御装置５では式(3)によつて入力P1が小さく
なつた分だけ弁開度ｄを大きくするようにする。
すなわちｄ√1が一定になるように演算する。
弁開度ｄを信号線ｌ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図のようにアキユムレー
タ３の元圧がαのように下がつても、射出速度は
設定値通りV0（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 d is increased by an amount corresponding to the decrease in the input P1 according to equation (3).
In other words, the calculation is performed so that d√ 1 is constant.
The valve opening degree d is input to the flow rate control valve 6 via the signal line 1, and the passing flow rate Q is maintained so as not to decrease. In this way, even if the source pressure of the accumulator 3 drops to α as shown in FIG. 4, the injection speed can be maintained at the set value V 0 (ie, the line indicated by β).
本発明方法は請求項１に示すように、射出工程
でアキユ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ユム
レータと射出シリンダとを接続し、射出工程にお
けるアキユ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つているの
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てアキユ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
度の拡開によつて補われ、その結果従来問題とさ
れれていたアキユ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つている
ので、作動油の清浄管理に特別の考慮を払う必要
もなく、棄極めて使い易く、高精度のアキユムレ
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ユーま
たはプランジヤロツ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ユム
レータと、アキユ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
射出工程中のアキユ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
キユ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 the injection process, and The valve opening is expanded as the pressure decreases, and the valve opening of the pressure oil in the injection process is expanded, and the flow rate of pressure oil passing through the valve in the injection process is maintained almost constant. Therefore, even if the accumulator source pressure decreases as the piston of the injection cylinder moves forward at high speed after injection is started, the decrease in source pressure is compensated for by the controlled expansion of the valve opening, which eliminates the conventional problem. The variation in injection speed caused by the use of an accumulator, which was thought to be a problem, has been eliminated, and high-speed molding can be performed with high precision and stability.In addition, the pressure oil supply to the injection cylinder can be controlled using a proportional electromagnetic flow control valve. Therefore, there is no need to pay special consideration to the cleanliness management of the hydraulic fluid, and there are advantages in that it is extremely easy to use, and that the accumulator injection speed can be controlled with high accuracy.
Further, in claim 2, an injection cylinder for driving an injection member such as a screw or a plunger rod of an injection molding machine, an accumulator for use in the injection process, and a proportional electromagnetic flow rate for controlling the amount of pressure oil supplied from the accumulator to the injection cylinder. A control valve and a pressure sensor to detect the drop in the source pressure of the accumulator during the injection process, and a proportional electromagnetic type flow control valve so that the flow rate of pressure oil passing through the valve is almost constant throughout the injection process based on the signal from the pressure sensor. Since a speed-controlled accumulator injection type injection molding machine is configured with a microcomputer type control device that increases the valve opening degree, 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……本発明のブロツク回路図、第４図……射
出工程における射出ストローク（ｘ軸）とアキユ
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ｂ……第６図ａに対す
るブロツク回路図、第７図ａ……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のブロツク回路図
１……油圧ポンプ、２……チエツク弁、３……
アキユムレータ、４……圧力センサ、５……マイ
コン方式制御装置、５ａ……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……ヘツド側、７ｂ……ロツド
側、７ｃ……ピストン、８……射出部材、ａ，
ｂ，ｃ，ｄ……管路、kl……電気信号線、ｍ，ｎ
……電気出力線。
Fig. 1... Hydraulic control circuit diagram of the present invention, Fig. 2...
...Detailed circuit diagram of the flow control valve used in the present invention, Fig. 3...Block circuit diagram of the present invention, Fig. 4...Injection stroke (x-axis), accumulator pressure and injection speed (y-axis) in the injection process Graph showing the relationship between the valve opening degree of the flow rate control valve (x-axis) and the flow rate of pressure oil passing through the valve (y-axis) in the injection process, FIG. 6a ...Conventional hydraulic control circuit diagram using a flow control valve with pressure compensation, Fig. 6b...Block circuit diagram for Fig. 6a, Fig. 7a...Conventional hydraulic control circuit diagram using a servo valve , Fig. 7b...Block circuit diagram of Fig. 7a 1...Hydraulic pump, 2...Check valve, 3...
Accumulator, 4... Pressure sensor, 5... Microcomputer system control device, 5a... Setting device, 6... Flow rate control valve, 6a... Comparison amplifier, 6b, 6c... Torque motor, 6d... Differential transformer, 6e... Electric signal input terminal, 6f... Spool, 7... Injection cylinder, 7a... Head side, 7b... Rod side, 7c... Piston, 8... Injection member, a,
b, c, d...pipe line, kl...electric signal line, m, n
...Electric output line.
Claims (1)
射出成形において、比例電磁方式流量制御弁を介
してアキユ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ユ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
徴とするアキユムレータ射出の速度制御方法。 ２ 射出成形機のスクリユーまたはプランジヤロ
ツ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ユムレータと、アキ
ユムレータから射出シリンダへの圧油給油量を制
御する比例電磁方式流量制御弁と、射出工程中の
アキユ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
速度制御型アキユムレータ射出方式の射出成形
機。[Claims] 1. In injection molding using pressure oil from an accumulator in the injection process, the accumulator and injection cylinder are connected via a proportional electromagnetic flow control valve,
A method for controlling the speed of accumulator injection, characterized in that the valve opening degree is increased in accordance with a decrease in the source pressure of the accumulator during the injection process, and the flow rate of pressure oil passing through the valve during the injection process is maintained almost constant. 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; A pressure sensor detects a drop in the source pressure of the accumulator during the injection process, and the valve opening of the proportional electromagnetic flow control valve is adjusted based on the signal from the pressure sensor so that the flow rate of pressure oil passing through the valve remains almost constant throughout the injection process. A speed controlled accumulator injection type injection molding machine characterized by being configured with a microcomputer type control device that expands the speed.
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 JPH02225020A (en) | 1990-09-07 |
| JPH0560774B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0890201A (en) * | 1994-09-14 | 1996-04-09 | Toshiba Mach Co Ltd | Injection device of die casting machine |
| JP3566248B2 (en) * | 2001-11-14 | 2004-09-15 | 住友重機械工業株式会社 | Hydraulic control device and hydraulic control method for injection molding machine |
-
1989
- 1989-02-27 JP JP4789589A patent/JPH02225020A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02225020A (en) | 1990-09-07 |
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