JPH066901Y2 - Clamping device for injection molding machine - Google Patents
Clamping device for injection molding machineInfo
- Publication number
- JPH066901Y2 JPH066901Y2 JP1988102795U JP10279588U JPH066901Y2 JP H066901 Y2 JPH066901 Y2 JP H066901Y2 JP 1988102795 U JP1988102795 U JP 1988102795U JP 10279588 U JP10279588 U JP 10279588U JP H066901 Y2 JPH066901 Y2 JP H066901Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- booster
- hydraulic
- mold
- mold opening
- 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 - Lifetime
Links
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は、射出成形機における型開動作を円滑に行い得
る油圧回路をもち、小型でかつ低廉な型締装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a compact and inexpensive mold clamping device having a hydraulic circuit capable of smoothly performing a mold opening operation in an injection molding machine.
（従来の技術） 第２図に従来の射出成形機における型開閉油圧回路を示
す。以下、同図に基づき従来の型開閉動作を説明する。
なお、同図には図示されていないが型締力を発生する機
構及びそのための油圧回路は別に設けられている。(Prior Art) FIG. 2 shows a mold opening / closing hydraulic circuit in a conventional injection molding machine. The conventional mold opening / closing operation will be described below with reference to FIG.
Although not shown in the figure, a mechanism for generating a mold clamping force and a hydraulic circuit therefor are separately provided.
まず、型閉行程について説明すると、カートリッジ弁2
2，24を開き、油圧源11より供給される圧油をａライン
を通して型開閉シリンダ３に導き、プラタン２を前進さ
せ、金型４を閉鎖し、図示しない型締力発生装置により
強大な型締力を得る。First, the mold closing stroke will be explained. The cartridge valve 2
2 and 24 are opened, the pressure oil supplied from the hydraulic power source 11 is guided to the mold opening / closing cylinder 3 through the line a, the platen 2 is advanced, the mold 4 is closed, and a powerful mold is generated by a mold clamping force generator (not shown). Get the tightening force.
次に型開行程では、離型低速→高速→再低速の順序でシ
ーケンシャルに進行する。一般に本動作は以下のように
なる。離型低速及び高速動作はカートリッジ弁21，23を
開き、ｂラインを通して型開閉シリンダ３に油圧源11か
らの圧油が供給される。一方、再低速動作はカートリッ
ジ弁22，23を開き、所謂差動回路を構成して低速を得
る。これら一連の動作において最も力を要するのは離型
低速時であり、離型低速時に必要な力及び高速時の最大
速度から油圧源11と型開閉切換バルブ組立12のサイズ、
圧力が設計される。Next, in the mold opening process, the mold release proceeds in the order of low speed → high speed → re-low speed. Generally, this operation is as follows. For low-speed and high-speed mold release operations, the cartridge valves 21 and 23 are opened, and pressure oil from the hydraulic pressure source 11 is supplied to the mold opening / closing cylinder 3 through the line b. On the other hand, in the re-low speed operation, the cartridge valves 22 and 23 are opened to form a so-called differential circuit to obtain a low speed. In this series of operations, it is the mold release low speed that requires the most force, and the size of the hydraulic power source 11 and the mold open / close switching valve assembly 12 from the force required at the mold release low speed and the maximum speed at the high speed,
Pressure is designed.
（考案が解決しようとする課題） しかるに、上述の従来装置には次に挙げる欠点があっ
た。(Problems to be Solved by the Invention) However, the above-described conventional device has the following drawbacks.
(1) 射出成形機における型締装置では、離型低速時に
のみ強大な力が必要であり、このため超高圧を用いる
か、或いは型開閉シリンダ径を大きくし、油圧源の容量
を大きくする必要がある。(1) A mold clamping device in an injection molding machine requires a strong force only at low mold release speeds.Therefore, it is necessary to use ultrahigh pressure or increase the mold opening / closing cylinder diameter to increase the hydraulic power source capacity. There is.
(2) このため、装置の大型化及びその為のコストアッ
プにつながり、或いはリスクの高い高価な超高圧用油圧
機器、配管部品を多く使用せねばならない。(2) Therefore, it is necessary to use a large amount of expensive hydraulic equipment for ultra-high pressure and piping parts, which lead to an increase in the size of the apparatus and an increase in cost therefor, or a high risk.
本考案はこうした点に鑑みなされたもので、大型化を回
避し、かつ高価な機器を用いることなく、確実な離型低
速動作を可能にした射出成形機の型締装置を提供しよう
とするものである。The present invention has been made in view of the above points, and an object of the present invention is to provide a mold clamping device for an injection molding machine that avoids an increase in size and enables reliable low-speed mold release operation without using expensive equipment. Is.
（課題を解決するための手段） このため本考案は、射出成形機の型開動作を制御する油
圧回路を備える型締装置において、前記油圧回路中に油
圧源からの通常圧を増圧させて超高圧を吐出させる増圧
器を介在させると共に、同増圧器からの吐出圧を超高圧
と通常圧とに切換える切換回路を設け、かつ増圧回路作
動後の増圧器ピストンの戻し操作のための独立した油圧
回路を有してなるもので、これを課題解決のための手段
とするものである。(Means for Solving the Problem) For this reason, the present invention provides a mold clamping device including a hydraulic circuit for controlling a mold opening operation of an injection molding machine, in which a normal pressure from a hydraulic source is increased in the hydraulic circuit. In addition to interposing a pressure booster that discharges ultrahigh pressure, a switching circuit that switches the discharge pressure from the pressure booster to ultrahigh pressure and normal pressure is provided, and an independent operation for returning the pressure booster piston after the pressure booster circuit operates. The above-mentioned hydraulic circuit is provided, and this is used as means for solving the problem.
（作用） 型開行程において、離型低速時は油圧源からの通常油圧
を増圧器に送り込み、増圧器を介して超高圧油を型開閉
シリンダに送って大きな力で型開を行う。型開高速時か
ら型開再低速時にかけては、増圧器を回路上から切離
し、油圧源からの通常油圧を増圧器を経由させることな
く型開閉シリンダに送るようにする。このときの速度制
御は通常の場合と同様である。つまり、本考案では通常
圧吐出と、超高圧吐出を選択する回路により、超高圧が
必要な時（離型低速）にのみ増圧器を介して超高圧を型
開閉シリンダに供給する。また、離型低速動作時以外の
時には復帰回路を介して増圧器を非作動の状態に復帰さ
せ、次サイクル動作のために待機させる。また本考案
は、増圧回路作動後の増圧器ピストンの戻し操作のため
の独立した油圧回路を設けたので、シリンダの大型化、
複雑化の解消を図ることができ、増圧器の部分が損傷し
ても、同増圧器はシリンダ本体とは別体のため容易に修
復可能である。また客先納入後に増圧比変更の要求があ
っても、増圧器の交換のみで簡単に要求に応ずることが
でき、更に増圧器ピストンを戻すのに、本考案では強制
的に別の油圧源より独立した油圧回路を用いて出来るた
め、安定したピストンの戻りが得られる。(Operation) In the mold opening stroke, when the mold releasing speed is low, the normal hydraulic pressure from the hydraulic pressure source is sent to the pressure booster, and the super high pressure oil is sent to the mold opening / closing cylinder via the pressure booster to perform the mold opening with a large force. During the high speed mold opening and the low speed mold opening, the pressure booster is disconnected from the circuit, and the normal hydraulic pressure from the hydraulic pressure source is sent to the mold opening / closing cylinder without passing through the pressure booster. The speed control at this time is the same as in the normal case. That is, in the present invention, the circuit for selecting the normal pressure discharge and the ultrahigh pressure discharge supplies the ultrahigh pressure to the die opening / closing cylinder through the pressure intensifier only when the ultrahigh pressure is required (mold release low speed). In addition, when the mold release low speed operation is not performed, the pressure booster is returned to the non-operating state via the return circuit, and is made to stand by for the next cycle operation. Further, the present invention is provided with an independent hydraulic circuit for returning the booster piston after the booster circuit is activated, so that the size of the cylinder is increased,
The complexity can be eliminated, and even if the pressure booster portion is damaged, the pressure booster can be easily repaired because it is separate from the cylinder body. In addition, even if there is a request to change the booster ratio after delivery to the customer, it is possible to meet the request simply by replacing the booster, and in order to return the booster piston, the present invention forces it from another hydraulic source. Since it can be done by using an independent hydraulic circuit, stable piston return can be obtained.
（実施例） 以下、本考案の実施例を図面について説明する。第１図
に本考案の代表的な実施例である射出成形機の型締装置
における油圧回路図を示す。Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a hydraulic circuit diagram in a mold clamping device of an injection molding machine which is a typical embodiment of the present invention.
同油圧回路において最も特徴とする部分は、第２図に示
した従来の油圧回路中、型開閉用切換バルブ組立12と型
開閉シリンダ３の型開動作時の油圧入側とを結ぶｂライ
ンの途中に、油圧増圧器組立30を組込んだ点である。The most characteristic part of the hydraulic circuit is the line b connecting the mold opening / closing switching valve assembly 12 and the hydraulic pressure input side of the mold opening / closing cylinder 3 during the mold opening operation in the conventional hydraulic circuit shown in FIG. The point is that the hydraulic booster assembly 30 was incorporated in the middle.
油圧増圧器組立30は増圧器31を有し、同増圧器31はその
本体内に大径チャンバと小径チャンバが形成され、各チ
ャンバ内に大径部と小径部をもつ増圧ピストン31aが内
蔵されチャンバH1，H2，H3を画成する。チャンバH1はソ
レノイドバルブ35を介して油タンクに通じさせると共
に、チェック弁37を介して油圧出側の型開閉シリンダ３
を結ぶｃラインとつながり、チェック弁37と型開閉シリ
ンダ３の通路途中で前記ｂラインとの間にバイパス回路
を形成する。このバイパス回路途中にはカートリッジ弁
32が介在され、同カートリッジ弁32にはソレノイドバル
ブ33の作動時にシャトル弁34を介してｂラインとｃライ
ンの何れかの油圧が操作圧として作用するようにされて
いる。更に増圧器31とチェック弁37との間の通路途中に
はソレノイドバルブ35を介して油圧源41からの油圧が作
用するようになっている。The hydraulic booster assembly 30 has a booster 31. The booster 31 has a large diameter chamber and a small diameter chamber formed in its main body, and a booster piston 31a having a large diameter portion and a small diameter portion is built in each chamber. To define chambers H 1 , H 2 and H 3 . The chamber H 1 is communicated with an oil tank via a solenoid valve 35, and a check valve 37 is used to communicate with the die opening / closing cylinder 3 on the hydraulic pressure outlet side.
A bypass circuit is formed between the check valve 37 and the line b in the passage of the mold opening / closing cylinder 3. Cartridge valve in the middle of this bypass circuit
32 is interposed, and the hydraulic pressure of either the b line or the c line acts as an operating pressure on the cartridge valve 32 via the shuttle valve 34 when the solenoid valve 33 is operated. Further, a hydraulic pressure from a hydraulic pressure source 41 acts on a path between the booster 31 and the check valve 37 via a solenoid valve 35.
増圧器31の型開動作入口側チャンバH2はソレノイドバル
ブ36を介してｂライン又は油タンクに通じるようになっ
ており、また同じく出口側チャンバH3はソレノイドバル
ブ35及びソレノイドバルブ36を介してピストン戻り用油
圧源41と油タンクとに通じている。The mold opening operation inlet side chamber H 2 of the booster 31 communicates with the line b or the oil tank via the solenoid valve 36, and the outlet side chamber H 3 also via the solenoid valve 35 and the solenoid valve 36. It communicates with the oil pressure source 41 for returning the piston and the oil tank.
以上の構成において、本実施例による型開行程における
動作を説明する。本実例においても従来例で示したよう
に型開行程は、離型低速（強大な力が必要）→型開高速
→型開再低速→停止の順序で進行する。The operation of the mold opening process according to the present embodiment having the above-mentioned configuration will be described. Also in this example, as shown in the conventional example, the mold opening process proceeds in the following order: mold release low speed (a strong force is required) → mold open high speed → mold open low speed → stop.
(1) 離型低速 カートリッジ弁21，23は開、ソレノイドバルブ36のソレ
ノイド“Ｂ”はON、ソレノイドバルブ33のソレノイド
“Ａ”はON、ソレノイドバルブ35のソレノイド“Ｃ”は
OFFの状態となる。油圧源11より供給される圧油はｂラ
インを経て油圧増圧器組立30に供給される。圧油は、カ
ートリッジ弁32が閉じられ、ソレノイドバルブ35がブロ
ックの状態となっているため、全て増圧器31のチャンバ
H2にソレノイドバルブ36を介して供給される。このた
め、増圧器ピストン31ａは図面左方へ移動し、チャンバ
H1に蓄えられている油を排出する。この時チャンバH1と
チャンバH2の油圧は、該チャンバの断面積に逆比例し、
通常圧（高圧）で供給された圧油が増圧されることにな
る。増圧された超高圧油はチェック弁37を介し、型開閉
シリンダ３に供給され、強大な型開力を発生させ、プラ
タン２は後退する。このときｃラインに供給される流量
は、チャンバH1とチャンバH2との断面積の比でｂライン
に供給される流量より小さくなる。(1) Release low-speed cartridge valves 21 and 23 are open, solenoid "B" of solenoid valve 36 is ON, solenoid "A" of solenoid valve 33 is ON, solenoid "C" of solenoid valve 35 is
It is turned off. The pressure oil supplied from the hydraulic pressure source 11 is supplied to the hydraulic pressure booster assembly 30 via the b line. Since the cartridge valve 32 is closed and the solenoid valve 35 is in the block state, all the pressure oil is in the chamber of the booster 31.
Supplied to H 2 via solenoid valve 36. Therefore, the booster piston 31a moves to the left in the drawing, and the chamber
Drain the oil stored in H 1 . At this time, the hydraulic pressure of the chamber H 1 and the chamber H 2 is inversely proportional to the cross-sectional area of the chamber,
The pressure oil supplied at the normal pressure (high pressure) is increased in pressure. The boosted ultra-high pressure oil is supplied to the mold opening / closing cylinder 3 via the check valve 37 to generate a strong mold opening force, and the platen 2 retracts. At this time, the flow rate supplied to the c line becomes smaller than the flow rate supplied to the b line due to the ratio of the cross-sectional areas of the chamber H 1 and the chamber H 2 .
(2) 型開高速→型開再低速 型開閉用切換バルブ組立12の動作については省略する。
ソレノイドバルブ33のソレノイド“Ａ”はOFF、ソレノ
イドバルブ36のソレノイド“Ｂ”はOFFとなり、ｂライ
ンに供給された圧油はカートリッジ弁32を経てｃライン
から型開閉シリンダ３に供給され、プラタン２は後退す
る。この時の油圧は油圧源11より供給される油圧（通常
圧）であり、ｃラインに供給される流量は、油圧源11よ
り供給される流量と同一であって通常圧で高速動作が実
現する。(2) Mold opening high speed → mold opening re-low speed The operation of the switching valve assembly 12 for mold opening / closing is omitted.
The solenoid "A" of the solenoid valve 33 is turned off, the solenoid "B" of the solenoid valve 36 is turned off, and the pressure oil supplied to the line b is supplied to the mold opening / closing cylinder 3 from the line c through the cartridge valve 32, and the platen 2 Retreats. The hydraulic pressure at this time is the hydraulic pressure (normal pressure) supplied from the hydraulic pressure source 11, the flow rate supplied to the c line is the same as the flow rate supplied from the hydraulic pressure source 11, and high speed operation is realized at the normal pressure. .
(3) 離型低速動作が終了すると、即ち本動作に入る
と、ソレノイドバルブ35のソレノイド“Ｃ”はONされ、
油圧源41から供給される圧油が増圧器31のチャンバH3に
ソレノイドバルブ35を介して供給され、ピストン31ａを
右方へ移動させる。これと同時にチャンバH1にはソレノ
イドバルブ35を介してタンクより油が供給される。チャ
ンバH2の油はソレノイドバルブ36を介してタンクに戻さ
れる。この動作は次サイクルの離型低速開始まで続けて
も良いし、ピストン31ａの位置が右方に到達したことを
リミットスイッチ等の手段を用いて検出し、その時点で
ソレノイド“Ｃ”をOFFしても良い。(3) When the releasing low speed operation is completed, that is, when the main operation is started, the solenoid “C” of the solenoid valve 35 is turned on,
The pressure oil supplied from the hydraulic pressure source 41 is supplied to the chamber H 3 of the pressure booster 31 via the solenoid valve 35, and moves the piston 31a to the right. At the same time, oil is supplied to the chamber H 1 from the tank via the solenoid valve 35. The oil in chamber H 2 is returned to the tank via solenoid valve 36. This operation may be continued until the mold releasing low speed starts in the next cycle, or when the position of the piston 31a reaches the right side is detected by using a means such as a limit switch, and at that time, the solenoid "C" is turned off. May be.
（考案の効果） 以上、詳細に説明した如く本考案によれば、型開のため
の油圧回路中に吐出圧を超高圧と通常圧とに選択的に切
換え得る増圧器を介在させたため、離型低速時にのみ強
大な力が必要な射出成形機の型開行程において、離型低
速時のために従来の如く超高圧を用いるか、或いは型開
閉シリンダ径を大きくし、油圧源の容量を大きくするよ
うな必要がなくなり、その結果、装置の大型化及び同大
型化によるコストアップが解消され、又はリスクが高く
高価な超高圧用油圧機器、配管部品等を多数使用する必
要がなくなり、極めて安全性が向上する。また本考案
は、増圧回路作動後の増圧器ピストンの戻し操作のため
の独立した油圧回路を設けたので、シリンダの大型化、
複雑化の解消を図ることができ、増圧器の部分が損傷し
ても、同増圧器はシリンダ本体とは別体のため容易に修
復可能である。また客先納入後に増圧比変更の要求があ
っても、増圧器の交換のみで簡単に要求に応ずることが
でき、更に増圧器ピストンを戻すのに、本考案では強制
的に別の油圧源より独立した油圧回路を用いて出来るた
め、安定したピストンの戻りが得られる。(Effect of the Invention) As described in detail above, according to the present invention, since the booster capable of selectively switching the discharge pressure between the ultrahigh pressure and the normal pressure is provided in the hydraulic circuit for mold opening, In the mold opening stroke of the injection molding machine, which requires a strong force only when the mold speed is low, use ultrahigh pressure as before for the low mold release time or increase the mold opening / closing cylinder diameter to increase the hydraulic power source capacity. As a result, the size of the device and the cost increase due to the size increase are eliminated, or there is no need to use many risky and expensive hydraulic equipment for ultra-high pressure, piping parts, etc., and it is extremely safe. The property is improved. Further, the present invention is provided with an independent hydraulic circuit for returning the booster piston after the booster circuit is activated, so that the size of the cylinder is increased,
The complexity can be eliminated, and even if the pressure booster portion is damaged, the pressure booster can be easily repaired because it is separate from the cylinder body. In addition, even if there is a request to change the booster ratio after delivery to the customer, it is possible to meet the request simply by replacing the booster, and in order to return the booster piston, the present invention forces it from another hydraulic source. Since it can be done by using an independent hydraulic circuit, stable piston return can be obtained.
第１図は本考案の代表的な実施例を示す型開閉用油圧回
路図、第２図は従来の同様油圧回路例図である。 図の主要部分の説明 ３……型開閉シリンダ 11……油圧源 31……増圧器 31ａ……（増圧器）ピストン 32……カートリッジ弁 33，35，36……ソレノイドバルブFIG. 1 is a hydraulic circuit diagram for opening / closing a mold showing a typical embodiment of the present invention, and FIG. 2 is a diagram showing an example of a hydraulic circuit similar to the conventional one. Description of main parts of the figure 3 …… Mold opening / closing cylinder 11 …… Hydraulic source 31 …… Booster 31a …… (Booster) Piston 32 …… Cartridge valve 33, 35, 36 …… Solenoid valve
Claims (1)
を備える型締装置において、前記油圧回路中に油圧源か
らの通常圧を増圧させて超高圧を吐出させる増圧器を介
在させると共に、同増圧器からの吐出圧を超高圧と通常
圧とに切換える切換回路を設け、かつ増圧回路作動後の
増圧器ピストンの戻し操作のための独立した油圧回路を
有してなることを特徴とする射出成形機の型締装置。1. A mold clamping device having a hydraulic circuit for controlling a mold opening operation of an injection molding machine, wherein a pressure booster for boosting a normal pressure from a hydraulic source to discharge an ultrahigh pressure is interposed in the hydraulic circuit. At the same time, a switching circuit that switches the discharge pressure from the booster to an ultra-high pressure and a normal pressure is provided, and an independent hydraulic circuit is provided for returning the booster piston after the booster circuit is activated. A mold clamping device for injection molding machines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988102795U JPH066901Y2 (en) | 1988-08-04 | 1988-08-04 | Clamping device for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988102795U JPH066901Y2 (en) | 1988-08-04 | 1988-08-04 | Clamping device for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0224921U JPH0224921U (en) | 1990-02-19 |
| JPH066901Y2 true JPH066901Y2 (en) | 1994-02-23 |
Family
ID=31333033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988102795U Expired - Lifetime JPH066901Y2 (en) | 1988-08-04 | 1988-08-04 | Clamping device for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH066901Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56151160A (en) * | 1980-04-25 | 1981-11-24 | Mitsubishi Heavy Ind Ltd | Die clamping device |
-
1988
- 1988-08-04 JP JP1988102795U patent/JPH066901Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0224921U (en) | 1990-02-19 |
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