JPH06304979A - Injection molding machine - Google Patents

Injection molding machine

Info

Publication number
JPH06304979A
JPH06304979A JP9925393A JP9925393A JPH06304979A JP H06304979 A JPH06304979 A JP H06304979A JP 9925393 A JP9925393 A JP 9925393A JP 9925393 A JP9925393 A JP 9925393A JP H06304979 A JPH06304979 A JP H06304979A
Authority
JP
Japan
Prior art keywords
injection
plunger
cylinder
piston rod
injection plunger
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.)
Pending
Application number
JP9925393A
Other languages
Japanese (ja)
Inventor
Taketoshi Ishikawa
武敏 石川
Satoshi Okuya
敏 奥谷
Fujihiko Narukawa
藤彦 成川
Yasuhiro Kuroki
康擴 黒木
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.)
Shibaura Machine Co Ltd
Original Assignee
Toshiba Machine Co 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 Toshiba Machine Co Ltd filed Critical Toshiba Machine Co Ltd
Priority to JP9925393A priority Critical patent/JPH06304979A/en
Publication of JPH06304979A publication Critical patent/JPH06304979A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • B29C45/542Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw using an accumulator between plasticising and injection unit, e.g. for a continuously operating plasticising screw

Abstract

PURPOSE:To prevent the bent-up and reduce the screw torque by moving back a piston rod as a driving means to the given position preliminarily and separating the same from an injection plunger before receiving a plasticizing material into the injection cylinder in a preplasticating injection molding machine. CONSTITUTION:When the dwelling process for the following cycle is completed in an injection means 22, the following metering process is started. At that time, an on-off valve 8 is opened and another on-off valve 10 is closed, and a resin material stored in an accumulator 6 is extruded by lowering a plunger 7 and fed into an injection cylinder 12, and an injection plunger 11 is moved back by the pressure. A piston rod 13b of a hydraulic cylinder 16 is moved back preliminarily to the given position fixed by required injection capacity and separated from the injection plunger 11 before metering. The load of slide resistance of the hydraulic cylinder 16 is not affected by the arrangement when the injection plunger 11 is moved back, and the resin pressure at the end of a screw 3 is lowered by resin flow and only a slight movement resistance is generated by the arrangement at the time of metering.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、主としてプラスチック
製品の成形に用いられる可塑化装置と射出装置からなる
プリプラ式の射出成形機に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-plastic injection molding machine mainly composed of a plasticizing device and an injection device used for molding plastic products.

【0002】[0002]

【従来の技術】プラスチックなどの樹脂の射出成形機に
は、材料の可塑化及び射出を一本のスクリュで行うイン
ライン式と、スクリュで可塑化した樹脂材料をプランジ
ャで射出するプリプラ式の2種類がある。
2. Description of the Related Art There are two types of injection molding machines for resins such as plastics: an in-line type that plasticizes and injects materials with a single screw, and a pre-plastic type that injects plasticized resin materials with a plunger. There is.

【0003】プリプラ式の射出成形機は、通常、可塑化
シリンダ内に設けた一軸又は二軸スクリュにより材料を
可塑化し、この可塑化した材料を可塑化シリンダの先端
からバルブを介して射出シリンダ中に吐出して計量す
る。この計量後、射出シリンダ内の射出プランジャによ
り可塑化材料をノズルを介して金型内に射出し成形する
ようになっている。上記射出プランジャは油圧シリンダ
等により駆動される。
A pre-plastic type injection molding machine usually plasticizes a material by a uniaxial or biaxial screw provided in a plasticizing cylinder, and the plasticized material is injected from a tip of the plasticizing cylinder through a valve into an injection cylinder. Discharge and measure. After this measurement, the plasticizing material is injected into the mold through the nozzle by the injection plunger in the injection cylinder and molded. The injection plunger is driven by a hydraulic cylinder or the like.

【0004】一般に、上記射出プランジャの射出圧力は
材料の流動特性と、上記ノズルから金型に至る流路の形
状等により異なるが、通常、射出シリンダ内で最大20
00kg・f/cm2 程度の高圧が必要とされる。
Generally, the injection pressure of the injection plunger differs depending on the flow characteristics of the material and the shape of the flow path from the nozzle to the mold, but normally, a maximum of 20 in the injection cylinder.
A high pressure of about 00 kg · f / cm 2 is required.

【0005】この為、上記射出プランジャを駆動する油
圧シリンダは上記条件を満たす出力を持つものが使用さ
れている。ところで、プリプラ式射出成形機の計量工程
においては、スクリュの吐出圧で射出プランジャを後退
させて射出プランジャの前方に樹脂を蓄積する。
Therefore, as the hydraulic cylinder for driving the injection plunger, one having an output satisfying the above conditions is used. By the way, in the measuring process of the pre-plastic injection machine, the injection plunger is retracted by the discharge pressure of the screw to accumulate the resin in front of the injection plunger.

【0006】ところが、前述したように、射出プランジ
ャを駆動する油圧シリンダのサイズは必要な射出圧力に
より決まるので一般には大型となり、油圧シリンダ自身
の摺動抵抗が大きく、計量工程時のスクリュの先端部の
樹脂圧力が上昇することになる。
However, as described above, since the size of the hydraulic cylinder that drives the injection plunger is determined by the required injection pressure, it is generally large, and the sliding resistance of the hydraulic cylinder itself is large, and the tip of the screw during the measuring process is large. The resin pressure will rise.

【0007】スクリュの先端部の樹脂圧力が高すぎる
と、背圧流の増大により、可塑化シリンダの脱気口へ樹
脂が逆流するいわゆるベントアップが発生する。また、
過度に高い樹脂圧は材料のセン断発熱を高め、ひいては
劣化を促進する。
If the resin pressure at the tip of the screw is too high, the back pressure flow increases, causing so-called vent-up in which the resin flows back to the degassing port of the plasticizing cylinder. Also,
An excessively high resin pressure increases the shear heat generation of the material, and thus accelerates the deterioration.

【0008】更には、スクリュの駆動トルクの増加をも
たらし駆動力の増大につながる等の弊害を生じる。い
ま、このようなプリプラ式の射出成形機の計量時のスク
リュの先端位置での樹脂圧力Pを考えると、 P=P1 +P2 +P3 +P4 ここで、P1 :流路内の樹脂流動による圧力降下 P2 :射出プランジャの移動時に該射出プランジャの外
周に働く抵抗 P3 :射出プランジャの駆動用油圧シリンダのピストン
及びロッドのパッキン抵抗 P4 :油圧回路抵抗 となる。
Further, the driving torque of the screw is increased, which causes an increase in driving force. Now, considering the resin pressure P at the tip position of the screw at the time of measurement of such a pre-plastic type injection molding machine, P = P1 + P2 + P3 + P4 where P1: pressure drop due to resin flow in the flow path P2: The resistance acting on the outer circumference of the injection plunger during movement of the injection plunger P3: The packing resistance of the piston and rod of the hydraulic cylinder for driving the injection plunger P4: The hydraulic circuit resistance.

【0009】P1 は樹脂流路部の構造と樹脂の流動特性
及び成形条件により決まってくる値であり、それらによ
り一定の値を持つものである。また、P2 及びP4 は通
常はP1 に比較するとかなり小さいので、Pの低減化に
は余り有効でない。
P1 is a value determined by the structure of the resin flow path, the flow characteristics of the resin, and the molding conditions, and has a constant value. Also, since P2 and P4 are usually much smaller than P1, they are not very effective in reducing P.

【0010】そこで、P3 を小さくする為には油圧シリ
ンダのパッキンの抵抗を減らすことが必要で、パッキン
に低摩擦の材料を使用することと、油圧シリンダの直径
を小さくしてパッキンの寸法を小さくすることが考えら
れる。
Therefore, in order to reduce P3, it is necessary to reduce the resistance of the packing of the hydraulic cylinder. It is necessary to use a low friction material for the packing and to reduce the diameter of the hydraulic cylinder to reduce the packing size. It is possible to do it.

【0011】[0011]

【発明が解決しようとする課題】しかしながら、必要な
成形圧力を得るための油圧シリンダの出力は、金型のキ
ャビティ形状、樹脂の流動特性及び成形条件によって決
まるので、油圧シリンダの作動油圧が決まれば必要なシ
リンダ最小径が決まり、これ以下に、シリンダ径を下げ
ることはできない。このため、上記したベントアップの
発生および材料の劣化を防止できないとともに、スクリ
ュトルクの増加による駆動力の増大も解消できないとい
う問題があった。
However, since the output of the hydraulic cylinder for obtaining the required molding pressure is determined by the cavity shape of the mold, the flow characteristics of the resin and the molding conditions, if the working hydraulic pressure of the hydraulic cylinder is determined. The minimum cylinder diameter required is determined, and the cylinder diameter cannot be reduced below this value. Therefore, there is a problem that the occurrence of vent-up and deterioration of the material cannot be prevented, and the increase in driving force due to the increase in screw torque cannot be eliminated.

【0012】そこで、本発明は、計量時、すなわち、射
出プランジャの後退時に駆動手段のピストンロッドが射
出プランジャの移動抵抗にならないようにすることによ
り、スクリュの先端部の材料圧を適当な範囲に保ち、ベ
ントアップおよび材料の劣化を防止するとともに、スク
リュトルクの低減を図ることができるようにした射出成
形機を提供することを目的とする。
Therefore, in the present invention, the material pressure at the tip of the screw is set within an appropriate range by preventing the piston rod of the drive means from becoming the movement resistance of the injection plunger at the time of measurement, that is, when the injection plunger is retracted. An object of the present invention is to provide an injection molding machine capable of maintaining the temperature, preventing vent up and deterioration of materials, and reducing the screw torque.

【0013】[0013]

【課題を解決するための手段】本発明は上記課題を解決
するため、シリンダ内に可塑性材料を受入れ、この可塑
性材料をスクリュの回転により、可塑化搬送する可塑化
手段と、この可塑化手段により可塑化搬送される可塑性
材料を射出シリンダ内に受け入れこの可塑性材料の圧力
により射出プランジャを後退させる射出手段と、この射
出手段の射出プランジャに接離されるピストンロッドを
有してなり、前記可塑性材料が前記射出シリンダ内に受
け入れられる前に、予め、前記ピストンロッドを所定位
置まで後退させて前記射出プランジャから離間させ、可
塑性材料が射出シリンダ内に受入られて射出プランジャ
が後退されて前記ピストンロッドに当接されたのち、前
記ピストンロッドを前進させ、この前進により、前記射
出プランジャを前進させて可塑性材料を射出させる駆動
手段とを具備してなる。
In order to solve the above problems, the present invention receives a plastic material in a cylinder, plasticizes and conveys the plastic material by rotating a screw, and the plasticizing means. It comprises an injection means for receiving the plasticized material to be plasticized and conveyed in the injection cylinder, and retracting the injection plunger by the pressure of the plasticized material, and a piston rod which is brought into contact with and separated from the injection plunger of the injection means. Prior to being received in the injection cylinder, the piston rod is retracted to a predetermined position and separated from the injection plunger in advance, and a plastic material is received in the injection cylinder and the injection plunger is retracted to hit the piston rod. After being contacted, the piston rod is advanced, and this advance causes the injection plunger to move forward. It is allowed to become comprises a driving means for injecting a plastic material.

【0014】[0014]

【作用】可塑性材料が射出シリンダ内に受け入れられる
前に、予め、駆動手段のピストンロッドを所定位置まで
後退させて射出プランジャから離間させておくことによ
り、可塑性材料が射出シリンダ内に受け入れられて射出
プランジャが後退されるとき、上記ピストンロッドが射
出プランジャの後退の抵抗になることがなく、スクリュ
先端部の可塑化材料圧を低減できる。
[Function] Before the plastic material is received in the injection cylinder, the piston rod of the drive means is retracted to a predetermined position and separated from the injection plunger in advance, so that the plastic material is received in the injection cylinder and injected. When the plunger is retracted, the piston rod does not resist the backward movement of the injection plunger, and the plasticized material pressure at the screw tip can be reduced.

【0015】[0015]

【実施例】以下、本発明を図1及び図2に示す一実施例
を参照して説明する。図1はプリプラ式射出成形機を示
すもので、図中1は駆動装置である。この駆動装置1に
は加熱シリンダ4が接続されている。この加熱シリンダ
4の内部には二軸スクリュ3が回転自在に設けられ、こ
の二軸スクリュ3は上記駆動装置1により回転駆動され
るようになっている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 shows a pre-plastic injection molding machine, in which 1 is a drive unit. A heating cylinder 4 is connected to the drive unit 1. A biaxial screw 3 is rotatably provided inside the heating cylinder 4, and the biaxial screw 3 is rotationally driven by the driving device 1.

【0016】上記駆動装置1、加熱シリンダ4、および
二軸スクリュ3によって可塑化手段21が構成されてい
る。また、上記加熱シリンダ4の上面部には可塑性材料
(以下、樹脂という)を流入させる流入口4aおよび脱
気口5が設けられ、先端部には吐出口4bが形成されて
いる。
The drive device 1, the heating cylinder 4, and the biaxial screw 3 constitute a plasticizing means 21. Further, the heating cylinder 4 is provided with an inflow port 4a and a degassing port 5 through which a plastic material (hereinafter referred to as resin) flows in, and a discharge port 4b is formed at the tip end thereof.

【0017】上記加熱シリンダ4の流入口4aには供給
フィ−ダ2が接続され、この供給フィ−ダ2から樹脂材
料が供給されるようになっている。また、上記加熱シリ
ンダ4の先端部にはアキュ−ムレ−タ6が接続され、こ
のアキュ−ムレ−タ6の側壁部には流入口6aが穿設さ
れ、この流入口6aは上記加熱シリンダ4の吐出口4b
に連通されている。
A supply feeder 2 is connected to the inlet 4a of the heating cylinder 4, and the resin material is supplied from the supply feeder 2. An accumulator 6 is connected to the tip of the heating cylinder 4, and an inflow port 6a is formed in the side wall of the accumulator 6 and the inflow port 6a is formed in the heating cylinder 4. Discharge port 4b
Is in communication with.

【0018】上記アキュ−ムレ−タ6の内部には、プラ
ンジャ7が上下動自在に設けられ、このプランジャ7は
図示しない油圧供給手段により供給される油圧により上
下動されるようになっている。
A plunger 7 is provided in the accumulator 6 so as to be vertically movable, and the plunger 7 is vertically moved by a hydraulic pressure supplied by a hydraulic pressure supply means (not shown).

【0019】また、上記アキュ−ムレ−タ6の下端部に
は吐出口6bが設けられ、この吐出口6bは開閉バルブ
8によって開閉されるようになっている。上記アキュ−
ムレ−タ6の下端部には射出シリンダ12が接続されて
いる。この射出シリンダ12の上面部には、上記アキュ
−ムレ−タ6の吐出口6bに連通する流入口12aが穿
設されている。前記射出シリンダ12の内部には射出プ
ランジャ11がスライド自在に設けられ、射出手段22
が構成されている。
A discharge port 6b is provided at the lower end of the accumulator 6 and the discharge port 6b is opened and closed by an opening / closing valve 8. Accu above
An injection cylinder 12 is connected to the lower end of the mullet 6. An inflow port 12a communicating with the discharge port 6b of the accumulator 6 is formed in the upper surface of the injection cylinder 12. An injection plunger 11 is slidably provided inside the injection cylinder 12, and injection means 22 is provided.
Is configured.

【0020】また、上記射出シリンダ12の先端部側に
は供給路12bが形成され、この供給路12bは開閉バ
ルブ10によって開閉されるようになっている。上記供
給路12bの先端部にはノズル9が接続され、このノズ
ル9から樹脂材料が吐出されるようになっている。
A supply path 12b is formed on the tip end side of the injection cylinder 12, and the supply path 12b is opened and closed by an opening / closing valve 10. A nozzle 9 is connected to the tip of the supply path 12b, and the resin material is discharged from the nozzle 9.

【0021】一方、上記射出シリンダ12の後端部側に
は、油圧シリンダ16が接続され、この油圧シリンダ1
6の内部には、ピストン13aとピストンロッド13b
が設けられて駆動手段23が構成されている。前記ピス
トン13aの外周面にはパッキン15が装着され、ま
た、上記ピストンロッド13bを挿通させる挿通口16
aの内周面にはパッキン14が装着されている。
On the other hand, a hydraulic cylinder 16 is connected to the rear end side of the injection cylinder 12, and the hydraulic cylinder 1
6 has a piston 13a and a piston rod 13b.
Is provided to constitute the driving means 23. A packing 15 is attached to the outer peripheral surface of the piston 13a, and an insertion port 16 for inserting the piston rod 13b.
A packing 14 is attached to the inner peripheral surface of a.

【0022】上記ピストン13aおよびピストンロッド
13bは図示しない油圧供給手段により供給される油圧
により前進あるいは後退されるようになっている。とこ
ろで、上記射出プランジャ11は上記射出シリンダ12
の流入口12aから流入される溶融樹脂の圧力により後
退されるようになっている。
The piston 13a and the piston rod 13b are moved forward or backward by the hydraulic pressure supplied by hydraulic pressure supply means (not shown). By the way, the injection plunger 11 is connected to the injection cylinder 12
The pressure of the molten resin flowing in from the inlet 12a is set back.

【0023】また、上記射出プランジャ11とピストン
ロッド13bとは分離されて接離されるようになってお
り、上記ピストンロッド13bは上記射出シリンダ12
の流入口12aから樹脂が流入される直前に予め、所定
距離後退されて上記射出プランジャ11から図2に示す
ように離間された状態に位置されるようになっている。
Further, the injection plunger 11 and the piston rod 13b are separated and brought into contact with and separated from each other, and the piston rod 13b is connected to the injection cylinder 12.
Immediately before the resin flows in from the inflow port 12a, the resin is retracted by a predetermined distance and is positioned so as to be separated from the injection plunger 11 as shown in FIG.

【0024】しかして、射出成形時には、まず、図1に
示すように、アキュムレ−タ6の開閉バルブ8を閉塞し
た状態で、供給フィダー2より樹脂材料を加熱シリンダ
4の流入口4aから内部に供給するとともに、駆動装置
lにより二軸スクリュ3を回転駆動する。この二軸スク
リュ3の回転駆動により、樹脂材料は可塑化されるとと
もに、混練されて前方に搬送される。この樹脂は加熱シ
リンダ4の先端部の吐出口4bからアキュームレータ6
の流入口6aを介してその内部に供給される。この樹脂
材料は、一定の背圧で保持されるプランジャ7を押し上
げてアキュームレータ6の内底部に蓄積される。
At the time of injection molding, however, as shown in FIG. 1, the resin material is supplied from the supply feeder 2 to the inside from the inlet 4a of the heating cylinder 4 with the opening / closing valve 8 of the accumulator 6 closed. While supplying, the biaxial screw 3 is rotationally driven by the drive device 1. The resin material is plasticized, kneaded, and conveyed forward by the rotational driving of the biaxial screw 3. This resin is discharged from the discharge port 4b at the tip of the heating cylinder 4 to the accumulator 6
Is supplied to the inside through the inflow port 6a. This resin material pushes up the plunger 7 which is held at a constant back pressure, and is accumulated in the inner bottom portion of the accumulator 6.

【0025】このとき、射出手段22は1サイクル先の
成形における射出および保圧工程を行っており保圧工程
を終了すると、次の計量工程に移る。このときには、図
2に示すように、開閉バルブ8が開いて開閉バルブ10
が閉じ、アキュームレータ6内に蓄積されている樹脂材
料は、プランジャ7の下降により押し出されて射出シリ
ンダ12内に送られ、その圧力により射出プランジャ1
1は後退する。
At this time, the injection means 22 carries out the injection and pressure-holding process in the molding one cycle ahead, and when the pressure-holding process is completed, the next measuring process starts. At this time, as shown in FIG. 2, the opening / closing valve 8 is opened and the opening / closing valve 10 is opened.
Is closed, the resin material accumulated in the accumulator 6 is pushed out by the lowering of the plunger 7 and sent into the injection cylinder 12, and the pressure thereof causes the injection plunger 1
1 retreats.

【0026】この時、油圧シリンダ16のピストンロッ
ド13bは上記したように、計量に先立って、必要な射
出容量から決まる所定位置まで予め、後退しており、射
出プランジャ11とは接触しないで離間している。
At this time, as described above, the piston rod 13b of the hydraulic cylinder 16 is retracted in advance to a predetermined position determined by the required injection capacity prior to the measurement, and is separated without coming into contact with the injection plunger 11. ing.

【0027】したがって、射出プランジャ11の後退時
には、該射出プランジャ11には油圧シリンダ16のパ
ッキン14及び15の摺動抵抗等の負荷が作用しないで
後退する。
Therefore, when the injection plunger 11 is retracted, the injection plunger 11 is retracted without a load such as sliding resistance of the packings 14 and 15 of the hydraulic cylinder 16 acting on the injection plunger 11.

【0028】この後退により、射出プランジャ11の後
端面がピストンロッド13bの先端面に当接すると、ピ
ストン13aに油圧が作用されてピストン13aととも
にピストンロッド13bが前進し、射出シリンダ12の
供給路12bおよびノズル9を介して図示しない金型内
へと射出される。
When the rear end surface of the injection plunger 11 comes into contact with the front end surface of the piston rod 13b due to this retreat, hydraulic pressure is applied to the piston 13a to move the piston rod 13b forward together with the piston 13a, and the supply passage 12b of the injection cylinder 12 is moved. And it is injected through a nozzle 9 into a mold (not shown).

【0029】上述したように、油圧シリンダ16のピス
トンロッド13bは、計量に先立って、必要な射出容量
から決まる所定位置まで予め、後退し、射出プランジャ
11とは接触しないで離間しているため、計量時、スク
リュ3の先端部の樹脂圧はスクリュ3の先端部以降の流
路内の樹脂流動による圧力降下と、上記射出プランジャ
11のわずかな移動抵抗分だけとなる。
As described above, the piston rod 13b of the hydraulic cylinder 16 is retracted in advance to a predetermined position determined by the required injection capacity prior to the measurement, and is separated from the injection plunger 11 without coming into contact therewith. At the time of measurement, the resin pressure at the tip of the screw 3 includes only the pressure drop due to the resin flow in the flow passage after the tip of the screw 3 and the slight movement resistance of the injection plunger 11.

【0030】したがって、上記スクリュ3の先端部の樹
脂圧は適当な範囲に保たれ、ベントアップ、および材料
の劣化を防止し、スクリュトルクを低減できる。なお、
本発明は上記一実施例に限られず、図3に示すように構
成しても良い。
Therefore, the resin pressure at the tip of the screw 3 is maintained in an appropriate range, vent up and deterioration of the material can be prevented, and the screw torque can be reduced. In addition,
The present invention is not limited to the above-described embodiment, but may be configured as shown in FIG.

【0031】すなわち、図3に示すものは、射出プラン
ジャ11の後端部に抵抗を付与する抵抗付与手段として
の油圧シリンダ17を並列に接続している。前記実施例
と同様に予め、駆動用シリンダ16のピストンロッド1
3bを後退させた後、前記抵抗用の油圧シリンダ17に
より所定の抵抗を与えながら射出プランジャ11をアキ
ュ−ムレ−タ6のプランジャ7の前進又は可塑化スクリ
ュ3による樹脂吐出圧力によって前記駆動用シリンダ1
6のピストンロッド13bに接する位置まで後退させて
可塑化樹脂を計量する。続いて、抵抗用の油圧シリダ1
7の抵抗を解放し、駆動用シリンダ16のピストンロッ
ド13bを前進させ、この前進により射出プランジャ1
1を前進させて射出を行うものである。
That is, in the structure shown in FIG. 3, a hydraulic cylinder 17 as a resistance applying means for applying resistance to the rear end portion of the injection plunger 11 is connected in parallel. The piston rod 1 of the drive cylinder 16 is previously prepared in the same manner as in the above embodiment.
After retreating 3b, the hydraulic cylinder 17 for resistance provides a predetermined resistance to the injection plunger 11 by advancing the plunger 7 of the accumulator 6 or the resin discharge pressure by the plasticizing screw 3 to drive the cylinder. 1
The plasticized resin is weighed by retreating to the position of 6 in contact with the piston rod 13b. Next, the hydraulic cylinder 1 for resistance
7 is released, the piston rod 13b of the drive cylinder 16 is moved forward, and by this forward movement, the injection plunger 1
1 is advanced to perform injection.

【0032】また、本発明は図4に示すようなものであ
っても良い。すなわち、この図4に示すものは、抵抗付
与手段としての油圧シリンダ18を射出プランジャ11
に対して直列に設けた例である。
Further, the present invention may be as shown in FIG. That is, in the structure shown in FIG. 4, the hydraulic cylinder 18 as the resistance applying means is provided with the injection plunger 11.
Is an example provided in series with respect to.

【0033】尚、図1および図2に示す実施例において
は、樹脂材料の可塑化、混連性能を上げるために、可塑
化スクリュとして二軸スクリュ3を用い、更に、均一な
可塑化品質を得るために前記二軸スクリュ3を連続回転
させて間欠動作の射出装置のバッファとしてアキューム
レータ6を設けているが、これらを通常の単軸スクリュ
にしてアキュームレータ6をなくした間欠可塑化方式と
しても、本発明を十分有効に適用できることは言うまで
もない。
In the embodiment shown in FIGS. 1 and 2, the twin screw 3 is used as the plasticizing screw in order to improve the plasticizing and compounding performance of the resin material, and further the uniform plasticizing quality is obtained. In order to obtain the above, the accumulator 6 is provided as a buffer of the injection device for intermittent operation by continuously rotating the biaxial screw 3, but even if the accumulator 6 is made into a normal single-screw screw and the accumulator 6 is eliminated, It goes without saying that the present invention can be applied sufficiently effectively.

【0034】また、図3および図4に示す実施例におけ
る射出プランジャ11の抵抗付与手段として油圧シリン
ダ17,18を用いたが、これに限られず、歯車等の機
械的装置を用いてもよい。その他、本発明はその要旨の
範囲内で、種々変更実施可能なことは勿論である。
Although the hydraulic cylinders 17 and 18 are used as the resistance applying means of the injection plunger 11 in the embodiments shown in FIGS. 3 and 4, the invention is not limited to this, and mechanical devices such as gears may be used. In addition, it goes without saying that the present invention can be modified in various ways within the scope of the gist thereof.

【0035】[0035]

【発明の効果】以上説明したように、本発明によれば、
計量時に射出プランジャに対し、駆動手段のピストンロ
ッドが移動抵抗として作用せず、スクリュ先端部の樹脂
圧を適当な範囲に保ち、ベントアップを防止するととも
に、スクリュトルクを低減して消費電力を削減できると
いう効果を奏する。
As described above, according to the present invention,
When measuring, the piston rod of the drive means does not act as a movement resistance against the injection plunger at the time of measurement, keeps the resin pressure at the screw tip within an appropriate range, prevents vent up, and reduces screw torque to reduce power consumption. It has the effect of being able to.

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

【図1】本発明の一実施例である射出成形機の保圧工程
時の状態を示す断面図。
FIG. 1 is a cross-sectional view showing a state of a pressure-holding process of an injection molding machine which is an embodiment of the present invention.

【図2】図1に示す射出成形機の計量工程時の動作を示
す断面図。
2 is a cross-sectional view showing the operation of the injection molding machine shown in FIG. 1 during a weighing process.

【図3】本発明の他の実施例である射出成形機を示す断
面図。
FIG. 3 is a cross-sectional view showing an injection molding machine which is another embodiment of the present invention.

【図4】本発明のさらに、他の実施例である射出成形機
を示す断面図。
FIG. 4 is a sectional view showing an injection molding machine which is still another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

4…シリンダ、3…スクリュ、12…射出シリンダ、1
1…射出プランジャ、13b…ピストンロッド、16…
油圧シリンダ、21…可塑化手段、22…射出手段、2
3…駆動手段。
4 ... Cylinder, 3 ... Screw, 12 ... Injection cylinder, 1
1 ... Injection plunger, 13b ... Piston rod, 16 ...
Hydraulic cylinder, 21 ... plasticizing means, 22 ... injection means, 2
3 ... Driving means.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 黒木 康擴 静岡県沼津市大岡2068の3 東芝機械株式 会社沼津事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhito Kuroki 2068 Ooka, Numazu City, Shizuoka Prefecture Numazu Works, Toshiba Machine Co., Ltd.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 シリンダ内に可塑性材料を受入れ、この
可塑性材料をスクリュの回転により可塑化搬送する可塑
化手段と、 この可塑化手段により可塑化搬送される可塑性材料を射
出シリンダ内に受け入れこの可塑性材料の圧力により射
出プランジャを後退させる射出手段と、 この射出手段の射出プランジャに接離されるピストンロ
ッドを有してなり、前記可塑性材料が前記射出シリンダ
内に受け入れられる前に予め、前記ピストンロッドを所
定位置まで後退させて前記射出プランジャから離間さ
せ、前記可塑性材料の圧力により射出プランジャが後退
されて前記ピストンロッドに当接されたのち、前記ピス
トンロッドを前進させ、この前進により、前記射出プラ
ンジャを前進させて前記可塑性材料を射出させる駆動手
段と、 を具備してなることを特徴とする射出成形機。
1. A plasticizing means for receiving a plastic material in a cylinder and plasticizing and transporting the plastic material by rotation of a screw, and a plastic material for plasticizing and transporting by the plasticizing means in an injection cylinder. It has an injection means for retracting the injection plunger by the pressure of the material, and a piston rod which is brought into contact with and separated from the injection plunger of the injection means, and the piston rod is previously attached before the plastic material is received in the injection cylinder. After being retracted to a predetermined position and separated from the injection plunger, the injection plunger is retracted by the pressure of the plastic material and brought into contact with the piston rod, and then the piston rod is advanced. Drive means for advancing and ejecting the plastic material. And an injection molding machine.
【請求項2】 前記射出プランジャの後退時に抵抗を付
与し、前進時に抵抗付与を解除する抵抗付与手段を備え
たことを特徴とする請求項1記載の射出成形機。
2. The injection molding machine according to claim 1, further comprising resistance applying means for applying resistance when the injection plunger moves backward and releasing resistance when moving forward.
JP9925393A 1993-04-26 1993-04-26 Injection molding machine Pending JPH06304979A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9925393A JPH06304979A (en) 1993-04-26 1993-04-26 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9925393A JPH06304979A (en) 1993-04-26 1993-04-26 Injection molding machine

Publications (1)

Publication Number Publication Date
JPH06304979A true JPH06304979A (en) 1994-11-01

Family

ID=14242553

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9925393A Pending JPH06304979A (en) 1993-04-26 1993-04-26 Injection molding machine

Country Status (1)

Country Link
JP (1) JPH06304979A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008055339A1 (en) 2006-11-10 2008-05-15 Husky Injection Molding Systems Ltd. Apparatus and methods for active mold decompression and melt accumulation in a shooting pot reservoir of an injection molding machine
JP6804674B1 (en) * 2020-03-02 2020-12-23 株式会社ソディック Injection molding machine and injection molding method
US11911944B2 (en) 2020-02-28 2024-02-27 Sodick Co., Ltd. Injection device and injection control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008055339A1 (en) 2006-11-10 2008-05-15 Husky Injection Molding Systems Ltd. Apparatus and methods for active mold decompression and melt accumulation in a shooting pot reservoir of an injection molding machine
EP2101979A1 (en) * 2006-11-10 2009-09-23 Husky Injection Molding Systems S.A. Apparatus and methods for active mold decompression and melt accumulation in a shooting pot reservoir of an injection molding machine
EP2101979A4 (en) * 2006-11-10 2010-02-03 Husky Injection Molding Apparatus and methods for active mold decompression and melt accumulation in a shooting pot reservoir of an injection molding machine
EP2251176A1 (en) 2006-11-10 2010-11-17 Husky Injection Molding Systems S.A. Method and apparatus for melt accumulation in a shooting pot reservoir of an injection molding machine
US11911944B2 (en) 2020-02-28 2024-02-27 Sodick Co., Ltd. Injection device and injection control method
JP6804674B1 (en) * 2020-03-02 2020-12-23 株式会社ソディック Injection molding machine and injection molding method
US11897176B2 (en) 2020-03-02 2024-02-13 Sodick Co., Ltd. Injection molding machine and method for injection molding

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