JP2001315178A - Method for controlling mold opening for injection molding machine - Google Patents

Method for controlling mold opening for injection molding machine

Info

Publication number
JP2001315178A
JP2001315178A JP2000137211A JP2000137211A JP2001315178A JP 2001315178 A JP2001315178 A JP 2001315178A JP 2000137211 A JP2000137211 A JP 2000137211A JP 2000137211 A JP2000137211 A JP 2000137211A JP 2001315178 A JP2001315178 A JP 2001315178A
Authority
JP
Japan
Prior art keywords
mold
mold opening
pressure
cylinder
check valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2000137211A
Other languages
Japanese (ja)
Inventor
Shinji Terada
眞司 寺田
Toshiaki Konishi
俊朗 小西
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP2000137211A priority Critical patent/JP2001315178A/en
Publication of JP2001315178A publication Critical patent/JP2001315178A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling mold opening by which action for mold opening at low speed can be smoothly performed even when spring force for movement of a runner stripper plate in a mold is strong in a straight- hydraulic mold clamping system. SOLUTION: Action for mold opening is performed by means of a booster cylinder 13 and a mold clamping cylinder 11 using the pressure receiving area of the cylinder when mold clamping force is generated and an electromagnetic switching type check valve 20 inserted into and connected with a hydraulic pipe 15-1 connected with the above described booster cylinder are included and when the action for mold opening at low speed is performed, before pressure in an oil room 11-1 on the mold closing side of the mold clamping cylinder is released, the inner pressure of the above described booster cylinder is released by means of the above described electromagnetic switching type check valve and then, the action for mold opening is performed by performing pressure releasing of the above described oil room on mold closing side.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、射出成形機の型開
制御方法に関し、特に直圧式型締装置を備え、金型には
ランナストリッパプレート移動用のばね手段が設けられ
ている射出成形機の型開制御方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold opening control method for an injection molding machine, and more particularly to an injection molding machine provided with a direct pressure type mold clamping device and a mold provided with a spring means for moving a runner stripper plate. And a mold opening control method.

【0002】[0002]

【従来の技術】図2を参照して、従来の直圧式型締装置
のうち、ブースタシリンダによる高速あるいは高圧型締
機能を有するものについて説明する。図2では、直圧式
型締装置のうち、型締駆動用の油圧回路に重きをおいて
示し、型締シリンダ11と型締ラム12については簡略
化して示しているが、型締ラム12にはブースタシリン
ダ13が組み合わされている。また、図示しない金型に
は、ばね部材により型開方向に付勢されているランナス
トリッパプレートが設けられている。以下では、型締シ
リンダ11において型閉時に圧油が供給される室を型閉
側油室11−1と呼び、型開時に圧油が供給される室を
型開側油室11−2と呼ぶことにする。
2. Description of the Related Art With reference to FIG. 2, a conventional direct pressure type mold clamping device having a high speed or high pressure mold clamping function by a booster cylinder will be described. In FIG. 2, of the direct pressure type mold clamping device, the hydraulic circuit for the mold clamping drive is shown with emphasis, and the mold clamping cylinder 11 and the mold clamping ram 12 are shown in a simplified manner. Is combined with a booster cylinder 13. A mold (not shown) is provided with a runner stripper plate which is urged in the mold opening direction by a spring member. Hereinafter, the chamber to which the pressurized oil is supplied when the mold is closed in the mold closing cylinder 11 is referred to as a mold-closed oil chamber 11-1, and the chamber to which the pressurized oil is supplied when the mold is opened is referred to as a mold-opening oil chamber 11-2. I will call it.

【0003】ブースタシリンダ13には、パイロットチ
ェック弁14を含む油圧配管15−1が接続され、この
油圧配管15−1は型開閉電磁切換弁16のポートAに
接続されている。パイロットチェック弁14と型開閉電
磁切換弁16との間の油圧配管15−1には、3ポート
2位置切換弁である昇圧/脱圧切換弁17を含む油圧配
管15−2が接続され、この油圧配管15−2は型閉側
油室11−1に接続されている。型閉側油室11−1に
はまた、プレフィル弁18を含む油圧配管15−3が接
続されている。型開側油室11−2には油圧配管15−
4が接続され、この油圧配管15−4は型開閉電磁切換
弁16のポートBに接続されている。型開閉電磁切換弁
16のポートPは油圧ポンプ(図示せず)の吐出側に接
続され、ポートTは圧油戻り用のタンク(図示せず)に
接続されている。
A hydraulic pipe 15-1 including a pilot check valve 14 is connected to the booster cylinder 13, and the hydraulic pipe 15-1 is connected to a port A of a mold opening / closing electromagnetic switching valve 16. A hydraulic pipe 15-2 including a pressure-in / pressure-down switching valve 17, which is a 3-port 2-position switching valve, is connected to a hydraulic pipe 15-1 between the pilot check valve 14 and the mold opening / closing electromagnetic switching valve 16. The hydraulic piping 15-2 is connected to the mold closing side oil chamber 11-1. A hydraulic pipe 15-3 including a prefill valve 18 is also connected to the mold closing side oil chamber 11-1. A hydraulic piping 15- is connected to the mold opening side oil chamber 11-2.
The hydraulic piping 15-4 is connected to the port B of the mold opening / closing electromagnetic switching valve 16. The port P of the mold opening / closing electromagnetic switching valve 16 is connected to a discharge side of a hydraulic pump (not shown), and the port T is connected to a tank (not shown) for returning hydraulic oil.

【0004】油圧配管15−4の油圧は、パイロットチ
ェック弁14及びプレフィル弁18に対してそのパイロ
ット圧として与えられる。すなわち、パイロットチェッ
ク弁14及びプレフィル弁18は、図中下側からの圧油
の流れに対しては開となるが、図中上側からの圧油の流
れに対しては閉となることで逆止弁の作用を果たし、ブ
ースタシリンダ13、型閉側油室11−1にそれぞれ圧
油を封じ込める。しかし、図中上側からの圧油の流れに
対しても、それぞれのパイロット圧を越えると、パイロ
ットチェック弁14及びプレフィル弁18は開となる。
The hydraulic pressure of the hydraulic piping 15-4 is given to the pilot check valve 14 and the prefill valve 18 as the pilot pressure. That is, the pilot check valve 14 and the prefill valve 18 are opened for the flow of pressure oil from the lower side in the figure, but are closed by closing for the flow of pressure oil from the upper side in the figure. It functions as a stop valve, and seals the pressurized oil in the booster cylinder 13 and the mold closing side oil chamber 11-1. However, when the flow of the pressure oil from the upper side in the drawing exceeds the respective pilot pressures, the pilot check valve 14 and the prefill valve 18 are opened.

【0005】[0005]

【発明が解決しようとする課題】ところで、金型内に
は、通常、型開時にランナを移動させるためにランナス
トリッパプレートと呼ばれる部材が設置されており、こ
のランナストリッパプレートはばね部材により型開方向
に付勢されている。
Incidentally, a member called a runner stripper plate is usually provided in the mold to move the runner when the mold is opened, and the runner stripper plate is opened by a spring member. Biased in the direction.

【0006】上記のような油圧回路及び金型の構成を持
つ射出成形機においては、型開動作に際しては、型閉側
油室11−1及びブースタシリンダ13内を脱圧する必
要がある。この場合、脱圧した時点でばね部材により金
型側から型締ラム12が押されてブースタシリンダ13
の内圧が上昇する。これは、パイロットチェック弁14
を開とするためのパイロット圧として高い圧力が必要と
なることを意味する。この圧力は、ばね部材に起因する
型開力とそのストロークによって変化する。
In the injection molding machine having the above-described configuration of the hydraulic circuit and the mold, it is necessary to depressurize the inside of the mold closing oil chamber 11-1 and the booster cylinder 13 during the mold opening operation. In this case, when the pressure is released, the mold clamping ram 12 is pushed from the mold side by the spring member and the booster cylinder 13 is pressed.
Internal pressure rises. This is the pilot check valve 14
Means that a high pressure is required as a pilot pressure for opening the valve. This pressure changes depending on the mold opening force caused by the spring member and its stroke.

【0007】これに対して、微低速で金型を開きたい場
合があり、特にパイロットチェック弁14において金型
を開閉するために要する負荷圧よりはるかに大きなパイ
ロット圧が必要となる場合がある。このような場合、油
圧ポンプから型開側油室11−2に圧油が供給されて
も、ばね部材に起因する型開力(外力)によって型締ラ
ム12が型開方向に移動することによる油圧配管15−
4の油圧、すなわちパイロットチェック弁14のパイロ
ット圧の低下、型締ラム12停止によるパイロット圧の
復旧がちぐはぐに発生し、パイロットチェック弁14の
動作が不安定になって低速型開動作時に振動的に金型が
開くという欠点がある。そして、このような動作によっ
て成形品に傷が付いたり、ランナ先端の細い部分が折れ
るという現象が発生し易くなる。
On the other hand, there is a case where it is desired to open the mold at a very low speed. In particular, there is a case where a pilot pressure much larger than a load pressure required for opening and closing the mold in the pilot check valve 14 is required. In such a case, even if pressure oil is supplied from the hydraulic pump to the mold opening side oil chamber 11-2, the mold clamping ram 12 moves in the mold opening direction due to the mold opening force (external force) caused by the spring member. Hydraulic piping 15-
4, the pilot pressure of the pilot check valve 14 decreases, and the pilot pressure is restored due to the stop of the mold clamping ram 12. The pilot check valve 14 becomes unstable and vibrates during the low speed mold opening operation. Has the disadvantage that the mold is opened. Such operations tend to cause a phenomenon that the molded product is damaged or a thin portion at the tip of the runner is broken.

【0008】そこで、本発明の課題は、ブースタシリン
ダを備えた直圧式型締装置において、金型内のランナス
トリッパプレート移動用のばね部材の力が強い場合であ
っても低速での型開動作をスムーズに行うことのできる
型開制御方法を提供することにある。
Accordingly, an object of the present invention is to provide a direct pressure type mold clamping device having a booster cylinder, in which the mold opening operation is performed at a low speed even when the spring member for moving the runner stripper plate in the mold is strong. Is to provide a mold opening control method capable of smoothly performing the mold opening control method.

【0009】[0009]

【課題を解決するための手段】本発明によれば、ブース
タシリンダによって型閉動作を行い、そのシリンダ受圧
面積を型締力発生時に使用する型締シリンダと、前記ブ
ースタシリンダに接続された油圧配管に挿入接続された
電磁切換型チェック弁とを含み、低速での型開動作に際
し、型締シリンダの型閉側油室の圧力を抜く前に、前記
電磁切換型チェック弁により前記ブースタシリンダ内圧
を開放するようにし、その後、前記型閉側油室の脱圧を
行って型開動作を行うようにしたことを特徴とする射出
成形機の型開制御方法が提供される。
According to the present invention, a mold closing operation is performed by a booster cylinder, and the cylinder pressure receiving area is used for generating a mold clamping force, and a hydraulic piping connected to the booster cylinder. And an electromagnetic switching type check valve inserted and connected to the pressurizing unit.When releasing the pressure in the mold closing side oil chamber of the mold closing cylinder during the mold opening operation at low speed, the electromagnetic switching type check valve reduces the booster cylinder internal pressure. A mold opening control method for an injection molding machine, characterized in that the mold opening operation is performed by releasing the pressure of the mold closing side oil chamber and then performing the mold opening operation.

【0010】[0010]

【発明の実施の形態】図1を参照して、本発明の実施の
形態について説明する。図1において、図2と同じ部分
には同じ番号を付している。本形態は、図2に示された
ブースタシリンダ13用のパイロットチェック弁14に
代えて電磁切換型チェック弁20を用いた点に特徴を有
する。電磁切換型チェック弁20はノンリークタイプで
あり、ブースタシリンダ13内に圧油を封じ込めるとい
う点ではパイロットチェック弁14と同じ機能を持つ
が、油圧配管15−4の油圧にかかわり無く開閉するこ
とができるという点で大きく異なる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals. This embodiment is characterized in that an electromagnetic switching type check valve 20 is used instead of the pilot check valve 14 for the booster cylinder 13 shown in FIG. The electromagnetic switching type check valve 20 is a non-leak type and has the same function as the pilot check valve 14 in that the pressurized oil is sealed in the booster cylinder 13, but can be opened and closed regardless of the hydraulic pressure of the hydraulic piping 15-4. It is very different in that it can be done.

【0011】図示しない金型には、前に述べたように、
ばね部材により型開方向に付勢されているランナストリ
ッパプレートが設けられている。
As described above, a mold (not shown)
A runner stripper plate urged in the mold opening direction by a spring member is provided.

【0012】ブースタシリンダ13には、電磁切換型チ
ェック弁20を含む油圧配管15−1が接続され、この
油圧配管15−1は型開閉電磁切換弁16のポートAに
接続されている。電磁切換型チェック弁20と型開閉電
磁切換弁16との間の油圧配管15−1には、3ポート
2位置切換弁である昇圧/脱圧切換弁17を含む油圧配
管15−2が接続され、この油圧配管15−2は型閉側
油室11−1に接続されている。型閉側油室11−1に
はまた、プレフィル弁18を含む油圧配管15−3が接
続されている。型開側油室11−2には油圧配管15−
4が接続され、この油圧配管15−4は型開閉電磁切換
弁16のポートBに接続されている。型開閉電磁切換弁
16のポートPは油圧ポンプ(図示せず)の吐出側に接
続され、ポートTは圧油戻り用のタンク(図示せず)に
接続されている。
The booster cylinder 13 is connected to a hydraulic line 15-1 including an electromagnetic switching type check valve 20, and the hydraulic line 15-1 is connected to a port A of a mold opening / closing electromagnetic switching valve 16. A hydraulic pipe 15-2 including a pressure-in / pressure-down switching valve 17, which is a 3-port 2-position switching valve, is connected to a hydraulic pipe 15-1 between the electromagnetic switching check valve 20 and the mold opening / closing electromagnetic switching valve 16. The hydraulic piping 15-2 is connected to the mold closing side oil chamber 11-1. A hydraulic pipe 15-3 including a prefill valve 18 is also connected to the mold closing side oil chamber 11-1. A hydraulic piping 15- is connected to the mold opening side oil chamber 11-2.
The hydraulic piping 15-4 is connected to the port B of the mold opening / closing electromagnetic switching valve 16. The port P of the mold opening / closing electromagnetic switching valve 16 is connected to a discharge side of a hydraulic pump (not shown), and the port T is connected to a tank (not shown) for returning hydraulic oil.

【0013】以下に、低速での型開動作について説明す
る。型開動作に際し、型締シリンダ11の型閉側油室1
1−1の圧力を抜く前に、ブースタシリンダ13の内圧
を電磁切換チェック弁20をオンとすることによってタ
ンクへ開放する。この間、ブースタシリンダ13による
金型押し付け力よりはるかに大きな押し付け力を発生す
ることのできる型閉側油室11−1の圧力で金型を全閉
させておく。その後、ブースタシリンダ13の内圧が低
下したら、油圧ポンプを起動して型開側油室11−2に
圧油を供給する一方、昇圧/脱圧切換弁17を通して型
閉側油室11−1の圧油を排出する。続いて、油圧配管
15−4の圧力がプレフィル弁18のパイロット圧に達
するとプレフィル弁18が開放されることにより、油圧
配管15−3を通しての圧油の排出が行われ、型開動作
が実行される。以上の型開動作は図示しない制御装置に
より行われる。
Hereinafter, the mold opening operation at a low speed will be described. During the mold opening operation, the mold closing side oil chamber 1 of the mold closing cylinder 11
Before releasing the pressure of 1-1, the internal pressure of the booster cylinder 13 is released to the tank by turning on the electromagnetic switching check valve 20. During this time, the mold is fully closed by the pressure of the mold closing side oil chamber 11-1 capable of generating a pressing force much larger than the mold pressing force by the booster cylinder 13. Thereafter, when the internal pressure of the booster cylinder 13 decreases, the hydraulic pump is started to supply the pressurized oil to the mold opening side oil chamber 11-2, while the pressurizing / depressurizing switching valve 17 opens the mold closing side oil chamber 11-1. Drain pressurized oil. Subsequently, when the pressure of the hydraulic pipe 15-4 reaches the pilot pressure of the prefill valve 18, the prefill valve 18 is opened, whereby the pressure oil is discharged through the hydraulic pipe 15-3, and the mold opening operation is performed. Is done. The above mold opening operation is performed by a control device (not shown).

【0014】以上のようにして、本形態によればブース
タシリンダ13の圧抜きに際して電磁切換型チェック弁
20の動作が不安定になるようなことが無いので、低速
での型開動作をスムーズに行うことができる。
As described above, according to this embodiment, the operation of the electromagnetic switching type check valve 20 does not become unstable when the booster cylinder 13 is depressurized, so that the mold opening operation at low speed can be smoothly performed. It can be carried out.

【0015】[0015]

【発明の効果】以上説明してきたように、本発明によれ
ば、直圧式の型締装置において、金型内に設けられてい
るランナストリッパプレート移動用のばね力が強い場合
であっても低速での型開動作をスムーズに行うことがで
きる。
As described above, according to the present invention, in the direct pressure type mold clamping device, even if the spring force for moving the runner stripper plate provided in the die is strong, the speed is reduced. Can smoothly perform the mold opening operation.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明が適用される直圧式の型締装置を、特に
型締駆動用の油圧回路に重きをおいて示した図である。
FIG. 1 is a diagram showing a direct pressure type mold clamping device to which the present invention is applied, with particular emphasis on a hydraulic circuit for mold clamping drive.

【図2】従来の直圧式の型締装置を説明するために概略
構成を示した図である。
FIG. 2 is a diagram showing a schematic configuration for explaining a conventional direct pressure type mold clamping device.

【符号の説明】[Explanation of symbols]

11 型締シリンダ 12 型締ラム 13 ブースタシリンダ 14 パイロットチェック弁 15−1〜15−4 油圧配管 16 型開閉電磁切換弁 17 昇圧/脱圧切換弁 18 プレフィル弁 20 電磁切換型チェック弁 DESCRIPTION OF SYMBOLS 11 Mold clamping cylinder 12 Mold clamping ram 13 Booster cylinder 14 Pilot check valve 15-1 to 15-4 Hydraulic piping 16 Mold opening / closing electromagnetic switching valve 17 Boost / pressure reduction switching valve 18 Prefill valve 20 Electromagnetic switching check valve

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ブースタシリンダによって型閉動作を行
い、そのシリンダ受圧面積を型締力発生時に使用する型
締シリンダと、 前記ブースタシリンダに接続された油圧配管に挿入接続
された電磁切換型チェック弁とを含み、 低速での型開動作に際し、型締シリンダの型閉側油室の
圧力を抜く前に、前記電磁切換型チェック弁により前記
ブースタシリンダ内圧を開放するようにし、その後、前
記型閉側油室の脱圧を行って型開動作を行うようにした
ことを特徴とする射出成形機の型開制御方法。
A mold closing operation is performed by a booster cylinder, and a cylinder pressure receiving area is used when a mold clamping force is generated. An electromagnetic switching type check valve inserted and connected to a hydraulic pipe connected to the booster cylinder. In releasing the mold at a low speed, before releasing the pressure in the mold closing side oil chamber of the mold closing cylinder, the internal pressure of the booster cylinder is released by the electromagnetic switching type check valve. A mold opening control method for an injection molding machine, wherein the mold opening operation is performed by depressurizing the side oil chamber.
JP2000137211A 2000-05-10 2000-05-10 Method for controlling mold opening for injection molding machine Withdrawn JP2001315178A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000137211A JP2001315178A (en) 2000-05-10 2000-05-10 Method for controlling mold opening for injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000137211A JP2001315178A (en) 2000-05-10 2000-05-10 Method for controlling mold opening for injection molding machine

Publications (1)

Publication Number Publication Date
JP2001315178A true JP2001315178A (en) 2001-11-13

Family

ID=18645020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000137211A Withdrawn JP2001315178A (en) 2000-05-10 2000-05-10 Method for controlling mold opening for injection molding machine

Country Status (1)

Country Link
JP (1) JP2001315178A (en)

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20070807