JPH0343970B2 - - Google Patents
Info
- Publication number
- JPH0343970B2 JPH0343970B2 JP58019682A JP1968283A JPH0343970B2 JP H0343970 B2 JPH0343970 B2 JP H0343970B2 JP 58019682 A JP58019682 A JP 58019682A JP 1968283 A JP1968283 A JP 1968283A JP H0343970 B2 JPH0343970 B2 JP H0343970B2
- Authority
- JP
- Japan
- Prior art keywords
- injection
- accumulator
- valve
- pressure oil
- filling
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (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〕
この発明は、プラスチツクの射出成形機におい
て、高速射出成形を安定して実現させるための射
出工程制御油圧回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection process control hydraulic circuit for stably realizing high-speed injection molding in a plastic injection molding machine.
従来の射出成形機において、高速で射出成形す
る場合、金型キヤビテイ内への樹脂の充填が完了
したときに充填動作から保圧動作へ確実に切換え
る制御は、バルブの切換え応答時間のばらつき等
により非常に困難であつた。このため、単に通常
の射出成形機に対しアキユムレータ等の高速射出
装置に付設しただけのものでは、充填完了時にシ
ヨツクが発生したり、保圧切換位置にばらつきが
生じる等の問題があつた。
When performing high-speed injection molding with conventional injection molding machines, it is difficult to control the reliably switching from filling operation to pressure holding operation when the filling of resin into the mold cavity is completed due to variations in valve switching response time, etc. It was extremely difficult. For this reason, when a conventional injection molding machine is simply attached to a high-speed injection device such as an accumulator, there are problems such as a shock occurring when filling is completed and variations in the holding pressure switching position.
そこで、本発明の目的は、射出シリンダに対
し、一定圧油を供給する第１ポンプとリリーフ弁
と流量調整弁と逆止弁とを備えた主管路と、第２
ポンプからの圧油をアキユムレータに一時的にチ
ヤージして射出工程時にアキユムレータの圧油を
前記射出シリンダに高速射出充填する充填管路と
を設けた油圧回路を使用し、高速で射出成形を行
う射出成形機において、射出シリンダを動作させ
て金型キヤビテイ内への樹脂の充填が完了した際
に、アキユムレータによる圧力変動により生じる
シヨツクの発生を有効かつ確実に防止して充填動
作から保圧動作への切換えを円滑に行うことがで
きる射出工程制御油圧回路を提供することにあ
る。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an injection cylinder with a main pipe line including a first pump, a relief valve, a flow rate adjustment valve, and a check valve, which supply constant pressure oil;
An injection molding method that performs injection molding at high speed using a hydraulic circuit equipped with a filling pipe that temporarily charges pressure oil from a pump into an accumulator and then injects and fills the injection cylinder with pressure oil from the accumulator at high speed during the injection process. In a molding machine, when the injection cylinder is operated to complete the filling of resin into the mold cavity, the system effectively and reliably prevents the occurrence of shock caused by pressure fluctuations caused by the accumulator, and allows the transition from filling operation to pressure holding operation. An object of the present invention is to provide an injection process control hydraulic circuit that can smoothly perform switching.
本発明に係る射出工程制御油圧回路は、射出シ
リンダに対し、一定圧油を供給する第１ポンプと
リリーフ弁と流量調整弁と逆止弁とを備えた主管
路と、第２ポンプからの圧油をアキユムレータに
一時的にチヤージして射出工程時にアキユムレー
タの圧油を前記射出シリンダに高速射出充填する
充填管路とを設けた射出成形機の油圧回路におい
て、
前記充填管路に設けるアキユムレータはピスト
ン式アキユムレータで構成し、このアキユムレー
タに対し第２ポンプからの圧油をリリーフ弁およ
び第１の切換弁を介して供給するよう回路構成す
ると共に前記アキユムレータからの圧油を第２の
切換弁により管路の開閉を行う開閉弁および流量
調整弁を介して射出シリンダへ射出充填するよう
回路構成し、
前記ピストン式アキユムレータのピストンロツ
ド部にドグを設けると共にその長手方向の任意の
位置に前記ドグと対向してチヤージ量を射出量に
応じて制御するための位置調整可能なリミツトス
イツチを設けることを特徴とする。
The injection process control hydraulic circuit according to the present invention includes a main pipe line equipped with a first pump, a relief valve, a flow rate adjustment valve, and a check valve that supplies constant pressure oil to the injection cylinder, and a main pipe line that supplies pressure oil to the injection cylinder at a constant pressure. In the hydraulic circuit of an injection molding machine, the hydraulic circuit of an injection molding machine is provided with a filling conduit for temporarily charging oil into an accumulator and injecting pressure oil from the accumulator into the injection cylinder at high speed during an injection process, wherein the accumulator provided in the filling conduit is a piston. A circuit is configured such that pressure oil from a second pump is supplied to the accumulator through a relief valve and a first switching valve, and the pressure oil from the accumulator is piped through a second switching valve. The circuit is constructed so that the injection cylinder is injected and filled through an on-off valve that opens and closes the passageway and a flow rate regulating valve, and a dog is provided on the piston rod portion of the piston type accumulator, and a dog is provided opposite to the dog at an arbitrary position in the longitudinal direction. The present invention is characterized in that a limit switch whose position is adjustable for controlling the charge amount according to the injection amount is provided.
本発明の射出工程制御油圧回路によれば、ピス
トン式アキユムレータに圧油をチヤージする際に
は開閉弁を閉動作させ第２ポンプからの圧油をリ
リーフ弁を介し第１の切換弁を開動作させて任意
の設定量をチヤージし、次いで射出シリンダへの
圧油の射出充填時には開閉弁を動作させてこれを
開動作しアキユムレータにおける圧油の設定量を
全て射出充填し、さらに射出シリンダへの圧油の
射出充填完了時には主管路のみから一定の保圧用
圧油を供給して射出シリンダ速度を急速に減速
し、充填工程から保圧工程への切換えに際しての
切換位置の安定化を行うことができる。
According to the injection process control hydraulic circuit of the present invention, when charging pressure oil to the piston type accumulator, the on-off valve is closed, and the pressure oil from the second pump is passed through the relief valve, and the first switching valve is opened. Then, when injecting and filling the injection cylinder with pressure oil, operate the on-off valve to open it, inject and fill the entire set amount of pressure oil in the accumulator, and then charge the injection cylinder with the set amount of pressure oil. When injection and filling of pressure oil is completed, a constant pressure oil for holding pressure is supplied only from the main pipe to rapidly reduce the injection cylinder speed and stabilize the switching position when switching from the filling process to the holding process. can.
次に、本発明に係る射出工程制御油圧回路の実
施例につき、添付図面を参照しながら以下詳細に
説明する。
Next, embodiments of the injection process control hydraulic circuit according to the present invention will be described in detail below with reference to the accompanying drawings.
第１図は、本発明の射出工程制御油圧回路の射
出充填中の状態を示すものである。そこで、第１
図において、参照符号１０はホツパ（図示せず）
により供給される樹脂を、加熱処理した後に金型
（図示せず）内に充填する射出成形機の射出シリ
ンダを示す。この射出シリンダ１０には、一定圧
油を供給する主管路１２と、高速射出充填を行う
充填管路１４とが接続されている。主管路１２は
射出充填工程および保圧工程時に圧油を供給し、
また充填管路１４は射出充填工程時のみ圧油を供
給するよう構成される。すなわち、主管路１２
は、第１ポンプ１６と保圧圧力を設定するリリー
フ弁１８とが設けられ、流量調整弁２０および逆
止分２２を介して射出シリンダ１０に連結されて
いる。また、充填管路１４は、ピストン式アキユ
ムレータ２４に任意の設定量の圧油をチヤージす
るための第２ポンプ２６とチヤージする圧力を設
定するリリーフ弁２８とが設けられ、チヤージ時
期を制御する電磁切換弁３０を直列に介して、前
記ピストン式アキユムレータ２４に接続されてい
る。さらに、前記ピストン式アキユムレータ２４
の吐出側は、パイロツト逆止弁３２と流量調整弁
３４を直列に介して射出シリンダ１０に連結され
ている。そして、ピストン式アキユムレータ２４
には、チヤージ量を射出充填量に応じて調整可能
とするために、ピストンロツド端部にドグ３０が
設けられると共に、前記ロツドの長手方向と同一
方向に位置調整可能なリミツトスイツチ３８が設
けられ、チヤージ量を射出量に応じて制御するよ
う構成されている。また、パイロツト逆止弁３２
には、弁を開動作させるためのパイロツト圧を供
給する電磁切換弁４０が設けられている。 FIG. 1 shows the state of the injection process control hydraulic circuit of the present invention during injection and filling. Therefore, the first
In the figure, reference numeral 10 is a hopper (not shown)
1 shows an injection cylinder of an injection molding machine that fills a mold (not shown) with a resin supplied by a mold after being heat-treated. This injection cylinder 10 is connected to a main line 12 that supplies constant pressure oil and a filling line 14 that performs high-speed injection and filling. The main pipe 12 supplies pressure oil during the injection filling process and the pressure holding process,
Further, the filling pipe line 14 is configured to supply pressure oil only during the injection filling process. That is, the main pipe 12
is provided with a first pump 16 and a relief valve 18 for setting a holding pressure, and is connected to the injection cylinder 10 via a flow rate adjustment valve 20 and a check valve 22. The filling pipe 14 is also provided with a second pump 26 for charging the piston-type accumulator 24 with an arbitrary set amount of pressure oil and a relief valve 28 for setting the charging pressure, and an electromagnetic electromagnetic valve 28 for controlling the charging timing. It is connected to the piston type accumulator 24 via a switching valve 30 in series. Furthermore, the piston type accumulator 24
The discharge side of is connected to the injection cylinder 10 via a pilot check valve 32 and a flow rate regulating valve 34 in series. And piston type accumulator 24
In order to adjust the charge amount according to the injection filling amount, a dog 30 is provided at the end of the piston rod, and a limit switch 38 whose position can be adjusted in the same direction as the longitudinal direction of the rod is provided. The injection amount is controlled according to the injection amount. In addition, the pilot check valve 32
is provided with an electromagnetic switching valve 40 that supplies pilot pressure for opening the valve.
次に、このように構成配置された射出工程制御
油圧回路の制御動作につき説明する。 Next, the control operation of the injection process control hydraulic circuit configured and arranged in this manner will be explained.
まず、射出充填が開始される前に、電磁切換弁
４０を図示のように無励磁位置Ｂとすると共に、
電磁切換弁３０を励磁位置Ａに切換える。従つ
て、ピストン式アキユムレータ２４は、前記電磁
切換弁３０を介して第２ポンプ２６と連通され、
リリーフ弁２８に設定された圧力の圧油がチヤー
ジされる。このチヤージ量は、射出充填完了時ま
たは射出充填完了の僅か手前で零となるように前
記ピストンロツドに設けたドグ３６をリミツトス
イツチ３８に当接させることにより調整すること
ができる。 First, before injection filling is started, the electromagnetic switching valve 40 is set to the non-excited position B as shown in the figure, and
Switch the electromagnetic switching valve 30 to the excitation position A. Therefore, the piston type accumulator 24 is communicated with the second pump 26 via the electromagnetic switching valve 30,
Pressure oil at the pressure set in the relief valve 28 is charged. This charge amount can be adjusted by bringing a dog 36 provided on the piston rod into contact with a limit switch 38 so that it becomes zero at the completion of injection filling or just before the completion of injection filling.
次いで、リミツトスイツチ３８が前記ドグ３６
に当接し、該リミツトスイツチ３８が作動する
と、電磁切換弁３０が図示したような無励磁位置
Ｂとなる。これにより、第２ポンプ２６とピスト
ン式アキユムレータ２４との間の管路の連通が断
たれ、圧油は電磁切換弁３０を経てタンクへ戻さ
れる。この時、パイロツトチエツク弁３２のパイ
ロツト圧力は電磁切換弁４０を経てタンクへ戻さ
れるので、パイロツト逆止弁３２は閉塞される。 Then, the limit switch 38 switches the dog 36
When the limit switch 38 is activated, the electromagnetic switching valve 30 is placed in the non-energized position B as shown. As a result, communication between the second pump 26 and the piston type accumulator 24 is cut off, and the pressure oil is returned to the tank via the electromagnetic switching valve 30. At this time, the pilot pressure in the pilot check valve 32 is returned to the tank via the electromagnetic switching valve 40, so the pilot check valve 32 is closed.
そして、射出充填開始の信号により、パイロツ
ト逆止弁３２の電磁切換弁４０が励磁されると、
パイロツト逆止弁３２内のポペツト弁が上がり、
パイロツト逆止弁３２は開動作するため、ピスト
ン式アキユムレータ２４よりパイロツト逆止弁３
２、流量調整弁３４を経て射出シリンダ１０に急
速に圧油が流れて高速射出充填が行われる。な
お、この時、主管路１２には第１ポンプ１６から
リリーフ弁１８で設定された一定圧の保圧用圧油
が流れているが、逆止弁２２の存在により逆流の
発生はない。ピストン式アキユムレータ２４は、
必要な吐出量を確実に射出シリンダ１０に送り出
すので、このピストン式アキユムレータ２４から
の吐出量が零となつたとき、射出充填は完了す
る。射出充填が完了すると、前記主管路１２から
の一定圧の保圧用圧油のみが射出シリンダ１０に
供給されるようになる。 Then, when the solenoid switching valve 40 of the pilot check valve 32 is energized by the injection filling start signal,
The poppet valve inside the pilot check valve 32 is raised,
Since the pilot check valve 32 is opened, the pilot check valve 3 is opened by the piston type accumulator 24.
2. Pressure oil rapidly flows into the injection cylinder 10 via the flow rate adjustment valve 34, and high-speed injection and filling is performed. At this time, pressure oil for maintaining pressure at a constant pressure set by the relief valve 18 is flowing from the first pump 16 into the main pipe 12, but due to the presence of the check valve 22, no backflow occurs. The piston type accumulator 24 is
Since the necessary discharge amount is reliably delivered to the injection cylinder 10, injection filling is completed when the discharge amount from the piston type accumulator 24 becomes zero. When the injection filling is completed, only the constant pressure pressure oil from the main pipe line 12 is supplied to the injection cylinder 10.
第２図に、主管路１２と充填管路１４から射出
シリンダ１０に供給される圧油の流量線図を示
す。すなわち、この線図から理解されるように、
射出充填中は充填管路１４の一定流量Q1と主管
路１２の一定流量Q2が射出シリンダ１０に供給
されるが、ピストン式アキユムレータ２４の吐出
量が零となつた時、射出シリンダ１０への供給は
瞬時に主管路１２の一定流量Q2に減少する。ま
た、射出シリンダ速度についても同様な線図を描
くので、充填工程から保圧工程に移行する際には
急激な減速を行なわせることができる。 FIG. 2 shows a flow diagram of the pressure oil supplied to the injection cylinder 10 from the main pipe line 12 and the filling pipe line 14. In other words, as understood from this diagram,
During injection filling, a constant flow rate Q 1 of the filling pipe 14 and a constant flow rate Q 2 of the main pipe 12 are supplied to the injection cylinder 10, but when the discharge amount of the piston type accumulator 24 becomes zero, The supply of is instantly reduced to a constant flow rate Q 2 in the main line 12. Furthermore, since a similar diagram is drawn for the injection cylinder speed, rapid deceleration can be performed when transitioning from the filling process to the pressure holding process.
なお、前述した実施例においては、ピストン式
アキユムレータ２４への圧油のチヤージは、チヤ
ージ専用の第２ポンプ２６により行つているが、
油圧回路の構成を変更することにより、第１ポン
プ１６によりピストン式アキユムレータ２４への
チヤージを行うようにすることは容易に可能であ
る。 In the embodiment described above, the piston type accumulator 24 is charged with pressure oil by the second pump 26 exclusively for charging.
By changing the configuration of the hydraulic circuit, it is easily possible to charge the piston type accumulator 24 using the first pump 16.
前述した実施例から明らかなように、本発明に
係る射出工程制御油圧回路によれば、充填管路に
設けるアキユムレータはピストン式アキユムレー
タで構成し、このアキユムレータに対し第２ポン
プからの圧油をリリーフ弁および第１の切換弁を
介して供給するよう回路構成すると共に前記アキ
ユムレータからの圧油を第２の切換弁により管路
の開閉を行う開閉弁および流量調整弁を介して射
出シリンダへ射出充填するよう回路構成し、前記
ピストン式アキユムレータのピストンロツド部に
ドグを設けると共にその長手方向の任意の位置に
前記ドグと対向してチヤージ量を射出量に応じて
制御するための位置調整可能なリミツトスイツチ
を設けることにより、前記アキユムレータにチヤ
ージする圧油の設定量を、射出シリンダへ射出充
填完了時に零となるよう任意に設定することがで
きる。また、これにより充填工程から保圧工程に
移行する際の射出シリンダの速度を急速に減速し
て、充填工程から保圧工程への切換位置を安定化
することができる。この結果、射出シリンダによ
り樹脂を金型に充填完了させた際に、前記アキユ
ムレータの圧力変動に伴うシヨツクの発生や、保
圧切換位置にばらつきを生ずる等の射出成形品の
品質に影響を及ぼす欠点を有効に除去することが
できる。特に、本発明の前記構成からなる射出工
程制御油圧回路によれば、比較的簡単な構成によ
り廉価に製作することができ、しかもその制御方
法も容易となる等の利点を有する。
As is clear from the embodiments described above, according to the injection process control hydraulic circuit according to the present invention, the accumulator provided in the filling pipe is a piston-type accumulator, and the pressure oil from the second pump is relieved from the accumulator. The circuit is configured to supply pressure oil through a valve and a first switching valve, and the pressure oil from the accumulator is injected and filled into an injection cylinder via an on-off valve and a flow rate regulating valve that open and close a pipe line with a second switching valve. A dog is provided on the piston rod portion of the piston type accumulator, and a limit switch whose position is adjustable is provided at an arbitrary position in the longitudinal direction opposite the dog to control the charge amount according to the injection amount. By providing this, the set amount of pressure oil charged to the accumulator can be arbitrarily set so that it becomes zero when injection and filling into the injection cylinder is completed. Furthermore, this allows the speed of the injection cylinder to be rapidly reduced when transitioning from the filling process to the pressure holding process, thereby stabilizing the switching position from the filling process to the pressure holding process. As a result, when the resin is completely filled into the mold with the injection cylinder, there are drawbacks that affect the quality of the injection molded product, such as the occurrence of shock due to pressure fluctuations in the accumulator and variations in the pressure holding switching position. can be effectively removed. In particular, the injection process control hydraulic circuit of the present invention having the above-mentioned configuration has the advantage that it can be manufactured at low cost due to its relatively simple configuration, and its control method is also simple.
また、前述した本発明の射出工程制御油圧回路
を制御する場合には、ピストン式アキユムレータ
に圧油をチヤージする際には開閉弁を閉動作させ
第２ポンプからの圧油をリリーフ弁を介し第１の
切換弁を開動作させて任意の設定量をチヤージ
し、次いで射出シリンダへの圧油の射出充填時に
は開閉弁を動作させてこれを開動作しアキユムレ
ータにおける圧油の設定量を全て射出充填し、さ
らに射出シリンダへの圧油の射出充填完了時には
主管路のみから一定の保圧用圧油を供給して射出
シリンダ速度を急速に減速し充填工程から保圧工
程への切換えに際しての切換位置の安定化を行う
ことにより、充填工程から保圧工程に移行する際
の射出シリンダの速度の急速な減速を容易に実現
することができると共にアキユムレータに対する
必要な圧油のチヤージから射出シリンダへの圧油
の射出充填並びに充填工程から保圧工程への切換
えをタイミングよく、しかも円滑に行うことがで
きる。従つて、このような制御方法により、前述
した射出工程制御油圧回路の回路動作によつて達
成される全ての利点を有効に発揮させることがで
きる。 In addition, when controlling the injection process control hydraulic circuit of the present invention described above, when charging the piston type accumulator with pressure oil, the on-off valve is closed, and the pressure oil from the second pump is passed through the relief valve. The switching valve 1 is opened to charge a desired set amount, and then when the injection cylinder is injected and filled with pressure oil, the on-off valve is opened to inject and fill the entire set amount of pressure oil in the accumulator. Furthermore, when injection and filling of the injection cylinder with pressure oil is completed, a constant pressure oil is supplied from the main pipe only to rapidly reduce the injection cylinder speed and change the switching position when switching from the filling process to the pressure holding process. By performing stabilization, it is possible to easily realize a rapid deceleration of the speed of the injection cylinder when transitioning from the filling process to the pressure holding process, and also to reduce the pressure oil charge from the necessary pressure oil charge to the accumulator to the injection cylinder. The injection filling process and the switching from the filling process to the pressure holding process can be performed in a well-timed and smooth manner. Therefore, with this control method, all the advantages achieved by the circuit operation of the injection process control hydraulic circuit described above can be effectively exhibited.
以上、本発明の好適な実施例について説明した
が、本発明は前述した実施例に限定されることな
く、本発明の精神を逸脱しない範囲内において
種々の設計変更をなし得ることは勿論である。 Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention. .
第１図は本発明に係る射出工程制御油圧回路の
一実施例を示す油圧回路図、第２図は第１図に示
す射出シリンダに供給される圧油の流量線図であ
る。
１０……射出シリンダ、１２……主管路、１４
……充填管路、１６……第１ポンプ、１８……リ
リーフ弁、２０……流量調整弁、２２……逆止
弁、２４……ピストン式アキユムレータ、２６…
…第２ポンプ、２８……リリーフ弁、３０……電
磁切換弁、３２……パイロツト逆止弁、３４……
流量調整弁、３６……ドグ、３８……リミツトス
イツチ、４０……電磁切換弁。
FIG. 1 is a hydraulic circuit diagram showing an embodiment of the injection process control hydraulic circuit according to the present invention, and FIG. 2 is a flow diagram of pressure oil supplied to the injection cylinder shown in FIG. 1. 10...Injection cylinder, 12...Main pipe, 14
... Filling pipe line, 16 ... First pump, 18 ... Relief valve, 20 ... Flow rate adjustment valve, 22 ... Check valve, 24 ... Piston type accumulator, 26 ...
...Second pump, 28...Relief valve, 30...Solenoid switching valve, 32...Pilot check valve, 34...
Flow rate adjustment valve, 36...dog, 38...limit switch, 40...electromagnetic switching valve.
Claims (1)
１ポンプとリリーフ弁と流量調整弁と逆止弁とを
備えた主管路と、第２ポンプからの圧油をアキユ
ムレータに一時的にチヤージして射出工程時にア
キユムレータの圧油を前記射出シリンダに高速射
出充填する充填管路とを設けた射出成形機の油圧
回路において、 前記充填管路に設けるアキユムレータはピスト
ン式アキユムレータで構成し、このアキユムレー
タに対し第２ポンプからの圧油をリリーフ弁およ
び第１の切換弁を介して供給するよう回路構成す
ると共に前記アキユムレータからの圧油を第２の
切換弁により管路の開閉を行う開閉弁および流量
調整弁を介して射出シリンダへ射出充填するよう
回路構成し、 前記ピストン式アキユムレータのピストンロツ
ド部にドグを設けると共にその長手方向の任意の
位置に前記ドグと対向してチヤージ量を射出量に
応じて制御するための位置調整可能なリミツトス
イツチを設けることを特徴とする射出工程制御油
圧回路。[Scope of Claims] 1. A main pipe line equipped with a first pump, a relief valve, a flow rate adjustment valve, and a check valve that supplies constant pressure oil to the injection cylinder, and pressure oil from the second pump to an accumulator. In the hydraulic circuit of an injection molding machine, the hydraulic circuit of an injection molding machine is provided with a filling conduit that is temporarily charged and then injects and fills the injection cylinder with pressurized oil from an accumulator at high speed during the injection process, wherein the accumulator provided in the filling conduit is a piston-type accumulator. A circuit is configured to supply pressure oil from a second pump to this accumulator via a relief valve and a first switching valve, and a second switching valve controls the opening and closing of a pipe line for the pressure oil from the accumulator. A circuit is configured to inject and fill the injection cylinder through an on-off valve and a flow rate regulating valve, and a dog is provided on the piston rod portion of the piston type accumulator, and a charge amount is controlled at an arbitrary position in the longitudinal direction facing the dog. An injection process control hydraulic circuit characterized by being provided with a position adjustable limit switch for controlling according to the injection amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1968283A JPS59146824A (en) | 1983-02-10 | 1983-02-10 | Hydraulic circuit for controlling injection step and method for controlling it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1968283A JPS59146824A (en) | 1983-02-10 | 1983-02-10 | Hydraulic circuit for controlling injection step and method for controlling it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59146824A JPS59146824A (en) | 1984-08-22 |
| JPH0343970B2 true JPH0343970B2 (en) | 1991-07-04 |
Family
ID=12006002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1968283A Granted JPS59146824A (en) | 1983-02-10 | 1983-02-10 | Hydraulic circuit for controlling injection step and method for controlling it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59146824A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH089189B2 (en) * | 1991-04-05 | 1996-01-31 | 株式会社日本製鋼所 | Method and apparatus for controlling injection process of injection molding machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS534174A (en) * | 1976-07-01 | 1978-01-14 | Nakamura Kouki Kk | Hydraulic control device utilizing accumulator |
-
1983
- 1983-02-10 JP JP1968283A patent/JPS59146824A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59146824A (en) | 1984-08-22 |
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