JPS6395926A - Hydraulic ejecting device for injection molder - Google Patents
Hydraulic ejecting device for injection molderInfo
- Publication number
- JPS6395926A JPS6395926A JP24209686A JP24209686A JPS6395926A JP S6395926 A JPS6395926 A JP S6395926A JP 24209686 A JP24209686 A JP 24209686A JP 24209686 A JP24209686 A JP 24209686A JP S6395926 A JPS6395926 A JP S6395926A
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- eject
- accumulator
- mold opening
- cylinder
- 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 description 3
- 239000007924 injection Substances 0.000 title description 3
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000001746 injection moulding Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 abstract description 8
- 238000000465 moulding Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004904 shortening 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- 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)
- Moulds For Moulding Plastics Or The Like (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の油圧エジェクト装置に係り、特に
射出成形機の油圧シリンダによる成形品エジェクトを型
開き途中に行うための油圧エジェクト装置の改善に関す
るものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hydraulic eject device for an injection molding machine, and more particularly to a hydraulic eject device for ejecting a molded product by a hydraulic cylinder of an injection molding machine during mold opening. It's about improvement.
射出成形機の工程において、金型のキャビティ内に射出
された原料樹脂が適当な時間冷却された後、型開きし、
型開き完了後、移動金型とこれを支持する移動グイプレ
ート内を貫通するエジェクト用ピンを作動させて成形品
を突き出すエジェクト工程に移る。この場合、成形サイ
クルの短縮のために、型開きの途中でエジェクトシリン
ダを作動させ、成形品のエジェクトを行うことが要望さ
れている。その際、油圧源が一個で、型開きシリンダと
エジェクトシリンダ双方のアクチュエータを同時に作動
させることになるので、油圧的にみて抵抗の弱いシリン
ダの方に圧油が先に回ることになり、双方のシリンダの
動きが不安定となる。In the process of an injection molding machine, the raw resin injected into the mold cavity is cooled for an appropriate period of time, and then the mold is opened.
After the mold opening is completed, the ejection process moves to ejecting the molded product by activating the eject pin that passes through the movable mold and the movable guide plate that supports it. In this case, in order to shorten the molding cycle, it is desired to operate an eject cylinder during mold opening to eject the molded product. At that time, a single hydraulic power source operates the actuators of both the mold opening cylinder and the eject cylinder at the same time, so the pressure oil goes first to the cylinder with the weaker resistance from a hydraulic point of view, and both The movement of the cylinder becomes unstable.
このような問題点を改善するための従来の射出成形機の
油圧エジェクト装置の例を第７図に示す。FIG. 7 shows an example of a conventional hydraulic eject device for an injection molding machine to solve these problems.
第７図において、型開閉シリンダ６と方向切替弁５、チ
ェック弁４ａおよび比例電磁式流量制御弁３を介して大
容量ポンプ５１に連通されて、比例電磁式流量制御弁３
と大容量ポンプ５１の途中がら分岐されたラインには比
例電磁式圧力制御弁２が設置されている。またエジェク
トシリンダ１３はチェック付絞り弁１２ａおよび１２ｂ
、方向切替弁１１、チェック弁４ｂおよび方向切替弁５
３を介して小容量ポンプ５２に連通されている。方向切
替弁５３と小容量ポンプ５２の途中から分岐されたライ
ンには方向切替え弁５４とリリーフ弁５５が設置されて
いる。In FIG. 7, the mold opening/closing cylinder 6 is connected to a large capacity pump 51 via the direction switching valve 5, the check valve 4a, and the proportional electromagnetic flow control valve 3.
A proportional electromagnetic pressure control valve 2 is installed in a line branched off midway between the large-capacity pump 51 and the large-capacity pump 51. Also, the eject cylinder 13 has check throttle valves 12a and 12b.
, direction switching valve 11, check valve 4b and direction switching valve 5
3 to a small capacity pump 52. A direction switching valve 54 and a relief valve 55 are installed in a line branched from the middle of the direction switching valve 53 and the small capacity pump 52.
このような射出成形機の油圧エジェクト装置において、
成形品のエジェクト時以外は、方向切替弁５３は無励磁
の状態となっており、型開きが始まるとオイルタンク１
内の油が大容量ポンプ５１、小容量ポンプ５２の吐出量
を合流させて型開閉シリンダ６に供給される。また、成
形品エジェクト時には方向切替弁５３．５４を励磁する
と、オイルタンク１内の油が小容量ポンプ５１からエジ
ェクト専用の回路を経てエジェクトシリンダ１３に圧油
が供給される。このとき、方向切替弁５５も励磁されて
エジェクトシリンダ１３に対する圧油の圧力はリリーフ
弁５５で調整される。In the hydraulic eject device of such an injection molding machine,
The direction switching valve 53 is in a non-excited state except when the molded product is ejected, and when the mold starts to open, the oil tank 1
The oil inside is supplied to the mold opening/closing cylinder 6 by combining the discharge amounts of the large capacity pump 51 and the small capacity pump 52. Furthermore, when the direction switching valves 53 and 54 are energized when ejecting a molded product, pressure oil is supplied from the small capacity pump 51 to the eject cylinder 13 via the small capacity pump 51 and a circuit dedicated to ejecting. At this time, the direction switching valve 55 is also excited, and the pressure of the pressure oil to the eject cylinder 13 is adjusted by the relief valve 55.
しかしながら、上記のような射出成形機の油圧エジェク
ト装置では、型開きの途中でエジェクトが始まると、エ
ジェクトシリンダ１３には小容量ポンプ５２からの圧油
を供給し、型開閉シリンダ６に大容量ポンプ５１からの
圧油が供給されることになる。このため、型開き速度は
、型開き開始時の速度より急に遅くなり、成形ザイクル
の短縮化に十分に対応できないものであった。However, in the hydraulic eject device of an injection molding machine as described above, when ejection starts during mold opening, pressure oil is supplied from the small capacity pump 52 to the eject cylinder 13, and the large capacity pump is supplied to the mold opening/closing cylinder 6. Pressure oil from 51 will be supplied. For this reason, the mold opening speed suddenly becomes slower than the speed at the start of mold opening, and it has not been possible to sufficiently respond to the shortening of the molding cycle.
本発明の目的は、上記した従来技術の問題点を解消し、
型開き速度を犠牲にすることなく、型開き途中の油圧エ
ジェクトをスムースに行うことができる射出成形機の油
圧エジェクト装置を提供することにある。The purpose of the present invention is to solve the problems of the prior art described above,
To provide a hydraulic eject device for an injection molding machine that can smoothly perform hydraulic ejection during mold opening without sacrificing mold opening speed.
ｃ問題点を解決するための手段〕
上記した目的は、射出成形機の型を開閉する型開閉シリ
ンダに連通された油圧回路と、該油圧回路から分岐され
、エジェクトシリンダに連通された油圧回路に設置され
た油圧アキュムレータと、該油圧アキュムレータに油圧
ポンプ負荷がない工程中に圧油をチャージし、前記型開
閉シリンダの作動による型開き途中のエジェクト工程時
には前記油圧アキュムレータにチャージされた圧油を前
記エジェクトシリンダに供給する手段とを備えた射出成
形機の油圧エジェクト装置によって達成される。c. Means for Solving Problems] The above purpose is to provide a hydraulic circuit connected to a mold opening/closing cylinder that opens and closes a mold of an injection molding machine, and a hydraulic circuit branched from the hydraulic circuit and connected to an eject cylinder. The installed hydraulic accumulator is charged with pressure oil during the process when there is no hydraulic pump load on the hydraulic accumulator, and during the ejection process during the mold opening by the operation of the mold opening/closing cylinder, the pressure oil charged in the hydraulic accumulator is charged with the pressure oil. This is accomplished by means of a hydraulic ejector of the injection molding machine with means for feeding the ejector cylinder.
油圧アキュムレータ（蓄圧器）を、型開閉シリンダに圧
油を供給する油圧回路から分岐した油圧回路に設置し、
エジェクト作業に必要なだけの圧油量を計算して、成形
サイクルの途中、ポンプの負荷のかかつていない工程、
例えば射出後、成形品の冷却中に、油圧ポンプ源から油
圧アキュムレータに圧油をチャージしておき、型開き途
中でエジェクト工程に入ると、型開きシリンダには油圧
ポンプ源からの圧油を全量供給し、エジェクトシリンダ
には油圧アキュムレータにチャージされた油量を吐出さ
せることによって型開き速度を全く犠牲にすることなく
、型開き途中の油圧エジェクトをスムーズに行うことが
できる。A hydraulic accumulator is installed in a hydraulic circuit branched from the hydraulic circuit that supplies pressure oil to the mold opening/closing cylinder.
Calculate the amount of pressurized oil required for ejecting work, and calculate the amount of pressurized oil required for ejecting.
For example, after injection, while the molded product is cooling, a hydraulic accumulator is charged with pressure oil from a hydraulic pump source, and when the eject process is started while the mold is opening, the entire amount of pressure oil from the hydraulic pump source is charged into the mold opening cylinder. By supplying the oil and discharging the amount of oil charged in the hydraulic accumulator to the eject cylinder, it is possible to smoothly perform hydraulic ejection during mold opening without sacrificing the mold opening speed at all.
以下、本発明の実施例を図面に基づいて説明する。第１
図は本発明の一実施例を示す油圧エジェクト回路である
。第１図において、油圧源のポンプ１は、印加する直流
電圧により成形工程ごとの油圧力を設定する比例電磁式
圧力調整弁２、印加する直流電圧により成形工程ごとの
流量、即ち作動シリンダの速度を設定する比例電磁式流
量調整弁３、チェック弁４ａ、電磁切替などによる方向
切替弁５を介して型開閉シリンダ６に連通されている。Embodiments of the present invention will be described below based on the drawings. 1st
The figure shows a hydraulic eject circuit showing one embodiment of the present invention. In Fig. 1, a pump 1 as a hydraulic source has a proportional electromagnetic pressure regulating valve 2 that sets the hydraulic pressure for each molding process by the applied DC voltage, and a proportional electromagnetic pressure regulating valve 2 that sets the hydraulic pressure for each molding process by the applied DC voltage, that is, the speed of the operating cylinder. It is communicated with a mold opening/closing cylinder 6 via a proportional electromagnetic flow rate adjustment valve 3 for setting the flow rate, a check valve 4a, and a direction switching valve 5 using electromagnetic switching.
エジェクトシリンダ１３は、比例電磁式流量制御弁３、
方向切替弁７、チェック弁８、チェック弁４ｂ、方向切
替弁１１、チェック付絞り弁１２ａ、１２ｂを介して油
圧ポンプ１に連通されている。チェック弁８及びチェッ
ク弁４ｂと間を接続する配管より分岐された配管の一方
にはアキュムレータ（蓄圧器）９が設置され、比例電磁
式流量制御弁３、方向切替弁７およびチェック弁８を介
するアキュムレータチャージ回路が設けられている。ま
た、このアキュムレータチャージ回路の途中から分岐し
た配管にはアキュムレータ９に残存する圧油をタンクに
戻すためのドレーンコック１０が設けられている。前記
チェック付絞り弁１２ａ、１２ｂは、チェック弁と絞り
弁とを並列に組合わせたもので、チェック付絞り弁１２
ａがエジェクト前進のとき、チェック付絞り弁１２ｂは
エジェクト後退のときの速度を調整するようになってい
る。The eject cylinder 13 includes a proportional electromagnetic flow control valve 3,
It is connected to the hydraulic pump 1 via a direction switching valve 7, a check valve 8, a check valve 4b, a direction switching valve 11, and check throttle valves 12a and 12b. An accumulator (pressure accumulator) 9 is installed on one side of the piping branched from the piping connecting the check valve 8 and the check valve 4b, and is connected to the proportional electromagnetic flow control valve 3, the direction switching valve 7, and the check valve 8. An accumulator charge circuit is provided. Further, a drain cock 10 for returning the pressure oil remaining in the accumulator 9 to the tank is provided in a pipe branching from the middle of the accumulator charge circuit. The check throttle valves 12a and 12b are a combination of a check valve and a throttle valve in parallel.
When the eject is moving forward, the check throttle valve 12b is adapted to adjust the speed when the eject is moving backward.
第２図において、本発明の制御装置２０を一点鎖線で囲
って明示してあり、成形層本来の制御装置３０とドツキ
ングできる構造とされている。In FIG. 2, the control device 20 of the present invention is clearly indicated by surrounding it with a dashed line, and has a structure that allows it to be docked with the control device 30 inherent in the forming layer.
制御装置２０はコンピュータ方式で、演算処理装置ｃｐ
ｕ、メモリー装置ＲＯＭ、ＲＡＭ、入出力インターフェ
ースＩＮ、ＯＵＴの他に、キーボード２１が設けられて
いる。キーボード２１にはエジェクトモード切替スイッ
チ２２、設定用テンキー２３、型開途中エジェクト開始
キースイッチ２４が配置しである。また制御装置２０の
中にエジェクト専用アキュムレータに必要な油量をチャ
ージするためのタイマ２５が設置されている。The control device 20 is a computer system, and includes an arithmetic processing device cp.
In addition to the memory device ROM, RAM, and input/output interfaces IN and OUT, a keyboard 21 is provided. Arranged on the keyboard 21 are an eject mode changeover switch 22, a setting numeric keypad 23, and a key switch 24 for starting ejection during mold opening. Further, a timer 25 is installed in the control device 20 to charge the eject exclusive accumulator with a necessary amount of oil.
次に上記手段による作用を第３図および第４図に基づい
て説明する。第３図は、ある金型を取り付は成形を開始
する時に、その金型による成形品をエジェクトシリンダ
作動でエジェクトするのに必要な圧油量、及びその圧油
量を油圧源からアキュムレータチャージするのに要する
時間を自動的に計算する準備作業に関するものである。Next, the operation of the above means will be explained based on FIGS. 3 and 4. Figure 3 shows the amount of pressurized oil required to eject the molded product from that mold by operating the eject cylinder when a certain mold is installed and molding starts, and the amount of pressurized oil is charged to an accumulator from a hydraulic source. This relates to preparatory work that automatically calculates the time required to complete the process.
キーボード２１のエジェクトモード切替スイッチ２２を
「型開途中エジェクト」にし、キーボード２１からエジ
ェクトストロークＳＩ、２回目以降のエジェクトストロ
ークＳ２、エジェクト回数Ｎ、及び型開き途中でエジェ
クト作動を開始する位置Ｓ。をテンキー２３から入力す
る。Set the eject mode selector switch 22 on the keyboard 21 to "eject during mold opening" and use the keyboard 21 to select eject stroke SI, second and subsequent eject strokes S2, number of ejects N, and position S where eject operation is started during mold opening. is input from the numeric keypad 23.
成形機ごとに固有なエジェクトシリンダのピストン径や
アキュムレータの特性数値などの下記に例示したような
数値は、予めＲＯＭに入力しであるので、式（１）（２
）（３）の計算式に従ってＱＬ 、ｔｃ 、Ｎｍａｘの
演算を行う。The numerical values shown below, such as the piston diameter of the eject cylinder and the characteristic numerical values of the accumulator, which are unique to each molding machine, are input into the ROM in advance, so equations (1) and (2)
) QL, tc, and Nmax are calculated according to the formula (3).
なお、下記の符号中、Ｄ、ｄ、Ｓｌ、Ｓ２は第５図およ
び第６図に示す通りである。In addition, in the following symbols, D, d, Sl, and S2 are as shown in FIG. 5 and FIG. 6.
（Ａ）成形機ごとに固有な値。(A) Unique value for each molding machine.
Ｄ＝エジェクトシリンダピストン径（ａｍ）ｄ＝エジェ
クトシリンダピストンロッド径（ｃｆｆｉ）Ｑｐ＝油圧
源の吐出量（ｎ／ｍ１ｎ）
ＱＡ＝アキュムレータにチャージできる上限（Ｃ（Ｂ）
金型ごとに操作者が入力する設定値。D = Eject cylinder piston diameter (am) d = Eject cylinder piston rod diameter (cffi) Qp = Discharge amount of hydraulic power source (n/m1n) QA = Upper limit that can be charged to the accumulator (C (B)
Setting values entered by the operator for each mold.
Ｓ、＝エジェクトストローク（ｃＩｌｌ）Ｓ２−２回目
以降のエジェクトストローク（ｃｍ）Ｎ−エジェクト回
数（回）
（Ｃ）演算値
ＱＬ ＝油圧エジェクト作動に必要な油量（ｃ ｃ）ｔ
ｃ−アキュムレータチャージに必要な時間（ｓ ｅ ｃ
）
Ｎｍａｘ−エジェクト設定回数の上限
（Ｎ〉２のとき） （回）
π
ＱＬ ＝ （２Ｄ２−ｄ２） ・ （ｓ＋ ＋
（Ｎ−１）Ｓｚ ）・・・・・・・・・・・・・（１）
ＱＬ
・・・・・・・・・・・・・（２）
上記の演算の結果、もし設定したエジェクト回数Ｎが、
アキュムレータにチャージ可能な油量の上限から決まる
エジェクト設定回数の上限値Ｎｍａｘより大きければ、
アラームを出してＮの再設定を操作者に知らせる。S, = Eject stroke (cIll) S2 - Second and subsequent eject strokes (cm) N - Number of ejects (times) (C) Calculated value QL = Oil amount required for hydraulic eject operation (c c) t
c - Time required to charge the accumulator (s e c
) Nmax - upper limit of the number of eject settings (when N>2) (times) π QL = (2D2-d2) ・ (s+ +
(N-1)Sz )・・・・・・・・・・・・・・・(1) QL ・・・・・・・・・・・・・・・(2) As a result of the above calculation, if the set eject The number of times N is
If it is larger than the upper limit value Nmax of the eject setting number determined from the upper limit of the amount of oil that can be charged to the accumulator,
An alarm is issued to notify the operator of the need to reset N.
このように準備完了した上で、型締（ステップ４１）の
状態から型開途中エジェクト開始キースイッチ２４をＯ
Ｎにすると、フローチャート第４図に従って自動サイク
ルが行われる。すなわち、射出・保圧（ステップ４２）
後、冷却開始（ステップ４３）と同時に次サイクル分の
材料の計量が始まる（ステップ４４）。計量完了か否か
を判別しくステップ４５）、計量完了後冷却タイム中は
、油圧源からどのシリンダにも送油する必要のない時間
帯となるので、この間を利用してアキュムレータ９に圧
油のチャージを開始する（ステップ４６）。After completing the preparations in this way, turn the eject start key switch 24 to O during mold opening from the mold clamping (step 41) state.
When set to N, an automatic cycle is performed according to the flowchart shown in FIG. That is, injection and holding pressure (step 42)
Thereafter, simultaneously with the start of cooling (step 43), the measurement of materials for the next cycle begins (step 44). In step 45), it is determined whether or not metering is complete.During the cooling time after metering is completed, there is no need to send oil from the hydraulic source to any cylinder, so use this time to supply pressure oil to the accumulator 9. Charging is started (step 46).
このとき前記（２）の計算式で演算して得たアキュムレ
ータチャージに必要な時間ｔｃだけタイマ２５で時限を
決めて、方向切替弁７のソレノイドを励磁し、油圧源か
らポンプを介して圧油をアキュムレータ９に送りこめば
よい。このとき比例電磁式流量制御弁３は全開、比例電
磁式圧力制御弁２はアキュムレータチャージに必要な圧
力になるようにプログラムで決めておく。At this time, the timer 25 is used to set a time limit for the time tc required to charge the accumulator, which is calculated using the calculation formula (2) above, and the solenoid of the direction switching valve 7 is energized, and pressure oil is supplied from the hydraulic source via the pump. can be sent to the accumulator 9. At this time, the proportional electromagnetic flow control valve 3 is fully opened, and the proportional electromagnetic pressure control valve 2 is programmed so as to have the pressure necessary for accumulator charging.
通常ｔｃはごく短時間なので、冷却タイムがアップする
までに７キユムレータチヤージは完了し、アキュムレー
タチャージの完了を判別した後（ステップ４７）、次い
で冷却タイムのタイムアツプを判別しくステップ４８）
た上、型開き工程に移る（ステップ４９）。もし薄肉成
形品などで冷却タイム設定が非常に小さい場合は冷却タ
イムがタイムアツプしてもアキュムレータチャージタイ
マ２５のタイムアツプを待って、型開き工程に移る。Normally, tc is very short, so 7 accumulator charges are completed before the cooling time is up, and after determining whether the accumulator charging is complete (step 47), it is then determined whether the cooling time is up (step 48).
After that, the process moves to the mold opening process (step 49). If the cooling time setting is very short for a thin-walled molded product, even if the cooling time has expired, wait for the accumulator charge timer 25 to time up and proceed to the mold opening process.
型開きの途中でエジェクト作動を開始する位置は、第２
図に示すようにボテンシコメータ、エンコーダ等の位置
検出器２６により検出され、この位置が型開き途中でエ
ジェクト作動を開始する位置Ｓ。に達したか否かを判別
しくステップ５０）、Ｓｏに達したならばエジェクト作
動を開始する（ステップ５１）。このときアキュムレー
タ９にチャージされた油量Ｑはエジェクトシリンダが設
定した動きをするのにちょうど十分なだけ演算で決めで
あるので、ポンプ源からの油量の助けを借りることなく
、エジェクト作動を完了させることができる。エジェク
ト完了（ステップ５２）及び型開完了（ステップ５３）
を待って中間タイム（ステップ５４）となり、次サイク
ルに連続する。The position where the eject operation starts during mold opening is the second position.
As shown in the figure, a position S is detected by a position detector 26 such as a potentiometer or an encoder, and this position is where the eject operation starts in the middle of mold opening. It is determined whether So has been reached (step 50), and if So has been reached, the eject operation is started (step 51). At this time, the amount of oil Q charged in the accumulator 9 is determined by calculation to be just enough for the eject cylinder to perform the set movement, so the eject operation is completed without the aid of the amount of oil from the pump source. can be done. Ejection completed (step 52) and mold opening completed (step 53)
Waiting for this, an intermediate time (step 54) occurs, and the process continues to the next cycle.
以上のように本発明によれば、型開きの途中で型開きと
エジェクト作動が並列して確実に作動するとともに型開
き速度を犠牲にすることなく射出成形のサイクルアップ
を図ることができる。As described above, according to the present invention, the mold opening and eject operations are reliably operated in parallel during mold opening, and the injection molding cycle can be increased without sacrificing the mold opening speed.
第１図は本発明の射出成形機の油圧エジェクト装置の一
実施例を示す系統図、第２図は本発明の装置における制
御装置構成図、第３図及び第４図は本発明の制御フロー
チャート、第５図および第６図は本発明におけるエジェ
クトシリンダとエジェクトストロークを示す説明図、第
７図は従来の射出成形機の油圧エジェクト装置を示す系
統図である。
１・・・・・・油圧ポンプ、２・・・・・・比例電磁式
圧力制御弁、３・・・・・・比例電磁式流量制御弁、４
ａ、４ｂ・・・・・・チェック弁、５・・・・・・方向
切替弁、６・・・・・・型開閉シリンダ、７・・・・・
・方向切替弁、８・・・・・・チェック弁、９・・・・
・・油圧アキュムレータ、１０・・・・・・ドレーンコ
ック、１１・・・・・・方向切替弁、１２ａ、１２ｂは
チェック付絞り弁、１３・・・・・・エジェクトシリン
ダ、２０・・・・・・制御装置、２１・・・・・・キー
ボード、２２・・・・・・エジェクトモード切替スイッ
チ、２３・・・・・・設定用テンキー、２４・・・・・
・型開途中エジェクト開始キースイッチ、２５・・・・
・・タイマ、２６・・・・・・位置検出器、３０・・・
・・・制御盤。FIG. 1 is a system diagram showing an embodiment of a hydraulic eject device for an injection molding machine of the present invention, FIG. 2 is a configuration diagram of a control device in the device of the present invention, and FIGS. 3 and 4 are control flow charts of the present invention. , FIG. 5 and FIG. 6 are explanatory diagrams showing an eject cylinder and an eject stroke in the present invention, and FIG. 7 is a system diagram showing a hydraulic eject device of a conventional injection molding machine. 1... Hydraulic pump, 2... Proportional electromagnetic pressure control valve, 3... Proportional electromagnetic flow control valve, 4
a, 4b...Check valve, 5...Direction switching valve, 6...Mold opening/closing cylinder, 7...
・Directional switching valve, 8... Check valve, 9...
... Hydraulic accumulator, 10 ... Drain cock, 11 ... Direction switching valve, 12a and 12b are throttle valves with check, 13 ... Eject cylinder, 20 ... ...control device, 21...keyboard, 22...eject mode changeover switch, 23...numeric keypad for settings, 24...
・Eject start key switch during mold opening, 25...
...Timer, 26...Position detector, 30...
···control panel.
Claims (1)
油圧回路と、該油圧回路から分岐され、エジェクトシリ
ンダに連通された油圧回路に設置された油圧アキュムレ
ータと、該油圧アキュムレータに油圧ポンプ負荷がない
ときに圧油をチャージし、前記型開閉シリンダの作動に
よる型開き途中のエジェクト工程時に前記油圧アキュム
レータにチャージされた圧油を前記エジェクトシリンダ
に供給する手段とを備えた射出成形機の油圧エジェクト
装置。A hydraulic circuit is connected to a mold opening/closing cylinder that opens and closes a mold of an injection molding machine, a hydraulic accumulator is installed in the hydraulic circuit branched from the hydraulic circuit and communicated with an eject cylinder, and a hydraulic pump load is applied to the hydraulic accumulator. A hydraulic eject for an injection molding machine, comprising means for charging pressurized oil when the mold is not in use, and for supplying the pressurized oil charged in the hydraulic accumulator to the eject cylinder during an eject process during mold opening by actuation of the mold opening/closing cylinder. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24209686A JPS6395926A (en) | 1986-10-14 | 1986-10-14 | Hydraulic ejecting device for injection molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24209686A JPS6395926A (en) | 1986-10-14 | 1986-10-14 | Hydraulic ejecting device for injection molder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6395926A true JPS6395926A (en) | 1988-04-26 |
| JPH0469534B2 JPH0469534B2 (en) | 1992-11-06 |
Family
ID=17084239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24209686A Granted JPS6395926A (en) | 1986-10-14 | 1986-10-14 | Hydraulic ejecting device for injection molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6395926A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02248231A (en) * | 1989-03-20 | 1990-10-04 | Toyo Mach & Metal Co Ltd | Hydraulic circuit of injection molding machine |
| JP2019150853A (en) * | 2018-03-05 | 2019-09-12 | 宇部興産機械株式会社 | Hydraulic control circuit for partial pressure pin, and control device therefor |
-
1986
- 1986-10-14 JP JP24209686A patent/JPS6395926A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02248231A (en) * | 1989-03-20 | 1990-10-04 | Toyo Mach & Metal Co Ltd | Hydraulic circuit of injection molding machine |
| JP2019150853A (en) * | 2018-03-05 | 2019-09-12 | 宇部興産機械株式会社 | Hydraulic control circuit for partial pressure pin, and control device therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0469534B2 (en) | 1992-11-06 |
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