JPH0768607A - Injection molding machine - Google Patents

Injection molding machine

Info

Publication number
JPH0768607A
JPH0768607A JP5375994A JP5375994A JPH0768607A JP H0768607 A JPH0768607 A JP H0768607A JP 5375994 A JP5375994 A JP 5375994A JP 5375994 A JP5375994 A JP 5375994A JP H0768607 A JPH0768607 A JP H0768607A
Authority
JP
Japan
Prior art keywords
resin
plunger
molding machine
injection molding
cavities
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5375994A
Other languages
Japanese (ja)
Other versions
JPH0780224B2 (en
Inventor
Tomoo Ohata
智生 大畑
Yoshie Yamada
嘉衛 山田
Wataru Sato
亘 佐藤
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.)
Niigata Engineering Co Ltd
Kumi Kasei Co Ltd
Original Assignee
Niigata Engineering Co Ltd
Kumi Kasei 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 Niigata Engineering Co Ltd, Kumi Kasei Co Ltd filed Critical Niigata Engineering Co Ltd
Priority to JP5375994A priority Critical patent/JPH0780224B2/en
Publication of JPH0768607A publication Critical patent/JPH0768607A/en
Publication of JPH0780224B2 publication Critical patent/JPH0780224B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To prevent burring and the like from generating and simplify the structure and control system of a molding machine. CONSTITUTION:When resin plasticized by a plasticizing device 20 is put in a measuring cylinder 71 by closing a opening/closing means mounted at passages 71a-71d, a plunger 72 rises, brings an adjusting bolt 73 into contact with a stopper 77, and stops. When the opening/closing means is opened and a pressing member 76 is lowered by a hydraulic cylinder 74, the plunger 72 is pressed by the pressing member 76 and lowers to inject resin in the measuring cylinder 71 into cavities 78a-78d. The resin amount of the measuring cylinder is made to coincide with the capacity of the cavity exactly by adjusting the adjusting bolt, so there occur no burring or the like. It is possible to eliminate a special control system and simplify the structure of a molding machine.

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、射出成形機に係り、特
に金型内に複数のキャビティを有する射出成形機に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine, and more particularly to an injection molding machine having a plurality of cavities in a mold.

【0002】[0002]

【従来の技術】従来、この種の射出成形機としては、図
3に示すものが知られていた。これは、樹脂Pを供給す
るためのホッパー1の下方に加熱筒2が設けられ、加熱
筒2の周囲にヒーター3…が巻かれているとともに、加
熱筒2内にスクリュー4が前後移動可能に設けられて構
成されている。スクリュー4は、油圧モータなどによっ
て回転し、また油圧シリンダなどによって前進移動する
ようになっており、スクリュー4の先端部には逆流防止
リング5が前後移動可能に設けられている。加熱筒2の
先端部には貫通孔6aが形成されたノズル6が設けられ
ている。このノズル6に対向する位置に、固定金型8と
可動金型9からなる金型7が設置され、固定金型8の一
端面に上記ノズル6の先端部が当接されて、貫通孔6a
と固定金型8のスプルー10とが連通されるようになっ
ている。スプルー10は途中で分岐されて、金型7内の
大きさの異なる複数のキャビティ11,12に開口して
いる。
2. Description of the Related Art Conventionally, an injection molding machine of this type has been known as shown in FIG. This is because a heating cylinder 2 is provided below the hopper 1 for supplying the resin P, heaters 3 are wound around the heating cylinder 2, and a screw 4 is movable back and forth in the heating cylinder 2. It is provided and configured. The screw 4 is rotated by a hydraulic motor or the like and is moved forward by a hydraulic cylinder or the like, and a backflow prevention ring 5 is provided at the tip of the screw 4 so as to be movable back and forth. A nozzle 6 having a through hole 6a is provided at the tip of the heating cylinder 2. A metal mold 7 including a fixed metal mold 8 and a movable metal mold 9 is installed at a position facing the nozzle 6, and the tip of the nozzle 6 is brought into contact with one end surface of the fixed metal mold 8 to form a through hole 6a.
And the sprue 10 of the fixed mold 8 are communicated with each other. The sprue 10 is branched along the way and opens into a plurality of cavities 11 and 12 having different sizes in the mold 7.

【0003】上記のように構成された射出成形機におい
ては、スクリュー4を回転させると、ホッパー1内の樹
脂が可塑化され、逆流防止リング5とスクリュー4の間
を通って加熱筒2内の先端部2aに蓄えられる。この場
合、可塑化された樹脂が蓄えられるにつれてスクリュー
4は後退し、この後退量によって、計量が行なわれる。
先端部2aにキャビティ11,12に応じた量が充填さ
れたら、スクリュー4の回転を停止する。
In the injection molding machine configured as described above, when the screw 4 is rotated, the resin in the hopper 1 is plasticized and passes through between the backflow prevention ring 5 and the screw 4 to cause the inside of the heating cylinder 2 to pass through. It is stored in the tip 2a. In this case, the screw 4 moves backward as the plasticized resin is stored, and the amount of the backward movement measures the screw.
When the tip portion 2a is filled with the amount corresponding to the cavities 11 and 12, the rotation of the screw 4 is stopped.

【0004】次いで、スクリュー4を前進させると、逆
流防止リング5の後端面がスクリュー4に密着し、可塑
化された樹脂がノズル6の貫通孔6aから射出され、ス
プルー10を通って金型7のキャビティ11,12内に
充填される。
Next, when the screw 4 is moved forward, the rear end surface of the backflow prevention ring 5 is brought into close contact with the screw 4, the plasticized resin is injected from the through hole 6a of the nozzle 6, passes through the sprue 10, and passes through the mold 7 Are filled in the cavities 11 and 12.

【0005】ところで、上記の射出成形機にあっては、
加熱筒2とスクリュー4によって可塑化および計量され
た樹脂が、ノズル6の貫通孔6aから射出されても、キ
ャビティ11とキャビティ12に同時に樹脂の充填が完
了されない。すなわち、小さい容量のキャビティ11内
に樹脂の充填が完了された時には、大きい容量のキャビ
ティ12内にはまだ充填されない部分がある。このた
め、キャビティ11内の樹脂とキャビティ12内の樹脂
とでは加圧条件、冷却時間などが異なってしまい、キャ
ビティ11内の樹脂にバリが発生するなどの不具合が生
じる。
By the way, in the above injection molding machine,
Even if the resin plasticized and measured by the heating cylinder 2 and the screw 4 is injected from the through hole 6a of the nozzle 6, the resin filling into the cavities 11 and 12 is not completed at the same time. That is, when the filling of the resin into the small volume cavity 11 is completed, there is a portion not yet filled into the large volume cavity 12. Therefore, the resin in the cavity 11 and the resin in the cavity 12 have different pressurizing conditions, cooling time, and the like, which causes a problem such as occurrence of burrs in the resin in the cavity 11.

【0006】この不具合を解決する方法として、キャビ
ティ11,12の数と同数(すなわち二つ)の加熱筒
2、スクリュー4を設け、これらのそれぞれでキャビテ
ィ11,12に見合った計量を行い、そして同時に射出
することが考えられる。しかしながら、この方法では、
装置が大掛かりとなり、したがって高価なものになって
しまうという問題がある。
As a method for solving this problem, the same number (that is, two) of heating cavities 2 and screws 4 as the cavities 11 and 12 are provided, and weighing is performed in proportion to the cavities 11 and 12, respectively, and It is possible to eject at the same time. However, with this method,
There is a problem that the device becomes large-scale and therefore expensive.

【0007】そこで次のような射出成形機が提案されて
いる。すなわち、その一つは、可塑化装置を複数のキャ
ビティに連絡する各樹脂通路のゲートにこれを開閉する
ピストンをそれぞれ設け、各ピストンを各キャビティに
設けられた圧力センサの検出信号により作動させてキャ
ビティの内圧を一定にする射出成形機である(実開昭5
6−143030号公報)。
Therefore, the following injection molding machine has been proposed. That is, one of them is to provide a piston for opening and closing the gate of each resin passage that connects the plasticizer to a plurality of cavities, and operate each piston by a detection signal of a pressure sensor provided in each cavity. This is an injection molding machine that keeps the internal pressure of the cavity constant.
6-143030).

【0008】また他の一つは、可塑化装置を複数のキャ
ビティに連絡する各樹脂通路に、容積拡大手段を設け、
該容積拡大手段を圧力センサの検出信号に基づいて駆動
手段で作動させてキャビティの圧力を制御するものであ
る(特開昭62−103121号公報)。
In the other one, a volume expanding means is provided in each resin passage connecting the plasticizing device to the plurality of cavities,
The volume expanding means is operated by the driving means based on the detection signal of the pressure sensor to control the pressure in the cavity (JP-A-62-103121).

【0009】[0009]

【発明が解決しようとする課題】上記二つの射出成形機
においては、前者の各ゲート、及び後者の各容積拡大手
段がいずれもランナーで互いに通じており、ゲートの開
度調整、及び容積拡大手段の作動は、他のゲートや他の
キャビティに影響するので、ゲートや容積拡大手段の設
備位置や作動のタイミングの決定が難しいなど、総合的
に構造と制御系が複雑になるという問題点がある。
In the above two injection molding machines, the former gates and the latter volume expanding means are all in communication with the runner, and the gate opening adjustment and the volume expanding means are performed. Since it affects other gates and other cavities, it is difficult to determine the equipment position and operation timing of the gate and volume expansion means, and there is a problem that the overall structure and control system become complicated. .

【0010】本発明は、構造と制御系が簡単でバリ等を
防止することができる射出成形機を提供することを目的
とする。
An object of the present invention is to provide an injection molding machine having a simple structure and control system and capable of preventing burrs and the like.

【0011】[0011]

【課題を解決するための手段】上記目的を達成するため
に、本発明に係る射出成形機は、可塑化装置で可塑化さ
れた樹脂を金型のキャビティに射出して成形する射出成
形機であって、可塑化装置と金型のキャビティとの間に
それらに連絡して設けられた複数の計量シリンダを有す
るシリンダ部材と、上記各計量シリンダにそれぞれ個々
に嵌入されたプランジャと、各プランジャの外端面に各
プランジャの長さ方向に調節自在に螺合された調節ボル
トと、上記各調節ボルトの頭部を当接させて上記各プラ
ンジャの各計量シリンダからの後退移動を止めるストッ
パと、上記各調節ボルトを貫通孔に挿通させた押圧部材
を各プランジャの外端面に押し当てて上記各プランジャ
を各計量シリンダ内で前進移動させ各計量シリンダ内の
樹脂を同時に各キャビティに射出する射出移動手段とを
具備した構成とした。
In order to achieve the above object, an injection molding machine according to the present invention is an injection molding machine for injecting a resin plasticized by a plasticizing device into a cavity of a mold for molding. And a cylinder member having a plurality of measuring cylinders provided between the plasticizing device and the cavity of the mold so as to communicate therewith, a plunger individually fitted to each of the measuring cylinders, and a plunger of each plunger. An adjusting bolt screwed to the outer end surface so as to be adjustable in the length direction of each plunger, a stopper that abuts the head of each adjusting bolt to stop the backward movement of each plunger from each measuring cylinder, The pressing member with each adjusting bolt inserted in the through hole is pressed against the outer end surface of each plunger, and the above plungers are moved forward in each measuring cylinder to simultaneously move the resin in each measuring cylinder to each key. It has a structure provided with the the injection moving means for injecting the Activity.

【0012】[0012]

【作用】可塑化装置で可塑化した樹脂を各計量シリンダ
に入れると、各プランジャは上昇して各調節ボルトをス
トッパに当接させて停止する。射出移動手段で押圧部材
を前進させると、各プランジャは押圧部材で押されて前
進し、各計量シリンダ内の樹脂を各キャビティに射出す
る。各調節ボルトの調節で各キャビティの容量に各計量
シリンダの樹脂量を正確かつ簡単に一致させることがで
きる。したがって、バリ等の発生を防止することがで
き、また、特別な制御系を必要とせず、構造も簡単であ
る。
When the resin plasticized by the plasticizer is put into each measuring cylinder, each plunger moves up and each adjusting bolt abuts against the stopper to stop. When the pressing member is moved forward by the injection moving means, each plunger is pushed by the pressing member to move forward, and the resin in each measuring cylinder is injected into each cavity. The amount of resin in each measuring cylinder can be accurately and easily matched with the volume of each cavity by adjusting each adjusting bolt. Therefore, it is possible to prevent the occurrence of burrs and the like, no special control system is required, and the structure is simple.

【0013】[0013]

【実施例】以下、本発明の射出成形機の実施例を図面を
参照しながら説明する。 (第1実施例)図1は、本発明の第1実施例を示す図で
ある。図1において、符号70は、シリンダ部材であっ
て、このシリンダ部材70には、複数の同一寸法形状の
計量シリンダ71…が形成されており、各計量シリンダ
71にはそれぞれプランジャ72がその軸方向に往復移
動可能に嵌入されている。各プランジャ72の外端面7
2aにはそれぞれ調節ボルト73が各プランジャ72の
長さ方向に調節自在に螺合されている。74は油圧シリ
ンダ(射出移動手段)であって、この油圧シリンダ74
の可動ロッド75の先端部には平板状の押圧部材76が
固定されている。この押圧部材76には複数の貫通孔7
6aが穿設されており、上記各調節ボルト73は、それ
ぞれ各貫通孔76aを挿通してプランジャ72に螺合さ
れている。77は、調節ボルト73の頭部73aに対向
して配設された平板状のストッパである。
Embodiments of the injection molding machine of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a diagram showing a first embodiment of the present invention. In FIG. 1, reference numeral 70 denotes a cylinder member, and a plurality of measuring cylinders 71 having the same size and shape are formed in the cylinder member 70. Each measuring cylinder 71 has a plunger 72 in its axial direction. It is reciprocatingly fitted in. Outer end face 7 of each plunger 72
Adjustment bolts 73 are screwed onto the respective 2a so as to be adjustable in the length direction of the plungers 72. Reference numeral 74 is a hydraulic cylinder (injection moving means).
A flat plate-shaped pressing member 76 is fixed to the tip of the movable rod 75. The pressing member 76 has a plurality of through holes 7
6a is bored, and the adjusting bolts 73 are screwed into the plungers 72 through the through holes 76a. Reference numeral 77 denotes a flat plate-shaped stopper that is arranged so as to face the head portion 73a of the adjustment bolt 73.

【0014】各計量シリンダ71は、金型内に形成され
た容量の異なる複数のキャビティ78a,78b,78
c,78dに通路71a,71b,71c,71dによ
ってそれぞれ個々に接続されている。また、可塑化装置
20は、それぞれチェック弁79…を介して通路71
a,71b,71c,71dに接続されている。通路7
1a,71b,71c,71dのキャビティ側には開閉
手段(図示せず)が設けられている。可塑化装置20
は、加熱筒21とこの内部に前後に移動可能に設けられ
たスクリュー22とを備えている。スクリュー22は油
圧モータなどによって回転し、また油圧シリンダなどに
よって前進移動するようになっている。
Each measuring cylinder 71 has a plurality of cavities 78a, 78b, 78 formed in the mold and having different capacities.
c, 78d are individually connected by passages 71a, 71b, 71c, 71d. Further, the plasticizing device 20 is provided with a passage 71 via check valves 79 ...
It is connected to a, 71b, 71c and 71d. Passage 7
Opening / closing means (not shown) is provided on the cavity side of 1a, 71b, 71c, 71d. Plasticizer 20
Includes a heating cylinder 21 and a screw 22 provided inside the heating cylinder 21 so as to be movable back and forth. The screw 22 is rotated by a hydraulic motor or the like, and is moved forward by a hydraulic cylinder or the like.

【0015】上記各調節ボルト73は、プランジャ72
の外端面72aからの突出長さを調節することにより、
各プランジャ72がストッパ77側へ移動する際、この
移動を停止し、各キャビティ78a,78b,78c,
78dの容量に応じて各計量シリンダ71内に充填され
る樹脂量を設定するものであり、キャビティの容量が小
さい場合にはより外端面72aから突出される。
The adjusting bolts 73 are provided on the plunger 72.
By adjusting the protruding length from the outer end surface 72a of
When each plunger 72 moves to the stopper 77 side, this movement is stopped and each cavity 78a, 78b, 78c,
The amount of resin filled in each measuring cylinder 71 is set according to the capacity of 78d, and when the capacity of the cavity is small, it is further projected from the outer end surface 72a.

【0016】次に、上記のように構成された射出成形機
の作用を説明する。可塑化装置20によって可塑化され
た樹脂を、開閉手段で通路71a,71b,71c,7
1dを閉じて各計量シリンダ71内に送り込むと、各計
量シリンダ71内に樹脂が流れ込むにつれて、プランジ
ャ72がストッパ77側に後退移動し、各調節ボルト7
3がストッパ77に当接して停止する。全部のプランジ
ャ72が停止したら樹脂の供給を停止する。この場合、
プランジャ72の外端面72aからの各調節ボルト73
の突出長さを調節することによって、各キャビティ78
a,78b,78c,78dのそれぞれに応じた樹脂量
を計量することができる。
Next, the operation of the injection molding machine configured as described above will be described. The resin plasticized by the plasticizer 20 is opened and closed by the passages 71a, 71b, 71c, 7
When 1d is closed and sent into each measuring cylinder 71, as the resin flows into each measuring cylinder 71, the plunger 72 moves backward to the stopper 77 side, and each adjustment bolt 7
3 contacts the stopper 77 and stops. When all the plungers 72 have stopped, the resin supply is stopped. in this case,
Each adjustment bolt 73 from the outer end surface 72a of the plunger 72
By adjusting the protruding length of each cavity 78
The amount of resin corresponding to each of a, 78b, 78c, and 78d can be measured.

【0017】次いで、通路71a,71b,71c,7
1dの開閉手段を開けて油圧シリンダ74の可動ロッド
75を伸長する。このようにすると、押圧部材76の端
面76bによって各プランジャ72が押し込まれて前進
移動し、各計量シリンダ71内の樹脂がそれぞれ各キャ
ビティ78a,78b,78c,78d内に射出され
る。射出が完了したら、油圧シリンダ74の可動ロッド
75を後退し、以後上記の動作を繰り返す。
Next, the passages 71a, 71b, 71c, 7
The opening / closing means 1d is opened to extend the movable rod 75 of the hydraulic cylinder 74. By doing so, the plunger 72 is pushed by the end surface 76b of the pressing member 76 and moves forward, and the resin in each measuring cylinder 71 is injected into each cavity 78a, 78b, 78c, 78d. When the injection is completed, the movable rod 75 of the hydraulic cylinder 74 is retracted, and the above operation is repeated thereafter.

【0018】以上のような射出成形機にあっては、可塑
化装置20によって可塑化された樹脂を、各計量シリン
ダ71で各キャビティ78a,78b,78c,78d
の容量に応じて計量することができ、そして、これら計
量した樹脂を油圧シリンダ74によって各キャビティ7
8a,78b,78c,78dに同時に射出完了するこ
とができる。したがって、バリの発生などがない良好な
成形を行うことができる。
In the injection molding machine as described above, the resin plasticized by the plasticizing device 20 is used by the respective measuring cylinders 71 to form the cavities 78a, 78b, 78c and 78d.
Can be weighed according to the capacity of each cavity, and these weighed resin can be
Injection can be completed simultaneously on 8a, 78b, 78c, and 78d. Therefore, good molding can be performed without causing burrs.

【0019】また、可塑化装置20と各計量シリンダ7
1との間にチェック弁79をそれぞれ設けたので、樹脂
をキャビティ78a,78b,78c,78d内へ射出
する際、樹脂が可塑化装置20側に逆流することがな
い。さらに、構造が簡単であるため安価に製作すること
ができる利点がある。
Further, the plasticizing device 20 and each measuring cylinder 7
Since the check valves 79 are respectively provided between the resin and the check valve 1, the resin does not flow back to the plasticizer 20 side when the resin is injected into the cavities 78a, 78b, 78c, 78d. Further, since the structure is simple, there is an advantage that it can be manufactured at low cost.

【0020】(第2実施例)図2は第2実施例を示す図
である。なお、図2において図1と同一構成要素には同
一符号を付してその詳細説明を省略する。図2におい
て、符号80は、シリンダ部材であって、このシリンダ
部材80には、同一寸法形状の複数の計量シリンダ8
1,81が形成されており、各計量シリンダ81にはそ
れぞれプランジャ82がその軸方向に往復移動可能に嵌
入されている。プランジャ82には、少し径の小さい中
径部82aとこの中径部82aよりさらに径の小さい小
径部82bとが形成されている。小径部82bには逆流
防止リング83がその軸方向に往復移動可能に設けられ
ている。各プランジャ82の外端面82cにはそれぞれ
調節ボルト73が螺合されている。
(Second Embodiment) FIG. 2 is a diagram showing a second embodiment. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted. In FIG. 2, reference numeral 80 denotes a cylinder member, and the cylinder member 80 has a plurality of measuring cylinders 8 of the same size and shape.
1, 81 are formed, and a plunger 82 is fitted in each measuring cylinder 81 so as to be reciprocally movable in its axial direction. The plunger 82 is formed with an intermediate diameter portion 82a having a slightly smaller diameter and a small diameter portion 82b having a diameter smaller than that of the intermediate diameter portion 82a. A backflow prevention ring 83 is provided on the small diameter portion 82b so as to be capable of reciprocating in the axial direction. Adjustment bolts 73 are screwed onto the outer end surface 82c of each plunger 82.

【0021】各計量シリンダ81は、金型内に形成され
た容量の異なる複数のキャビティ84a,84bに、開
閉手段(図示せず)を有する通路81a,81bでそれ
ぞれ個々に接続されている。また、各計量シリンダ81
は、それぞれ可塑化装置20に接続されている。上記各
調節ボルト73は、プランジャ82の外端面82cから
の突出長さを調節することにより、各プランジャ82が
ストッパ77側へ移動する際、この移動を停止し、各キ
ャビティ84a,84bの容量に応じて各計量シリンダ
81内に充填される樹脂量を設定するものであり、キャ
ビティの容量が小さい場合にはより外端面82cから突
出される。
Each of the measuring cylinders 81 is individually connected to a plurality of cavities 84a, 84b formed in the mold and having different capacities by passages 81a, 81b having opening / closing means (not shown). In addition, each measuring cylinder 81
Are connected to the plasticizing device 20, respectively. The adjusting bolts 73 stop the movement of the plungers 82 when the plungers 82 move toward the stopper 77 by adjusting the protruding length of the plunger 82 from the outer end surface 82c, so that the capacities of the cavities 84a and 84b are adjusted. Accordingly, the amount of resin filled in each measuring cylinder 81 is set, and when the volume of the cavity is small, the resin is further projected from the outer end surface 82c.

【0022】次に、上記のように構成された射出成形機
の作用を説明する。可塑化装置20によって可塑化され
た樹脂を、開閉手段で通路81a,81bを閉じて各計
量シリンダ81内に送り込むと、各計量シリンダ81内
に樹脂が流れ込むにつれて、プランジャ82がストッパ
77側に後退移動し、各調節ボルト73がストッパ77
に当接して停止する。全部のプランジャ82が停止した
ら樹脂の供給を停止する。この場合、プランジャ82の
外端面82cからの各調節ボルト73の突出長さを調節
することによって、各キャビティ84a,84bのそれ
ぞれに応じた樹脂量を計量することができる。
Next, the operation of the injection molding machine configured as described above will be described. When the resin plasticized by the plasticizer 20 is sent into each measuring cylinder 81 by closing the passages 81a and 81b by the opening / closing means, the plunger 82 moves backward to the stopper 77 side as the resin flows into each measuring cylinder 81. Move and each adjustment bolt 73 will stop
Abut and stop. When all the plungers 82 have stopped, the resin supply is stopped. In this case, the amount of resin corresponding to each of the cavities 84a and 84b can be measured by adjusting the protruding length of each adjusting bolt 73 from the outer end surface 82c of the plunger 82.

【0023】次いで、通路81a,81bの開閉手段を
開いて油圧シリンダ74の可動ロッド75を伸長する。
このようにすると、押圧部材76の端面76bによって
各プランジャ82が押し込まれて前進移動し、各計量シ
リンダ81内の樹脂がそれぞれ各キャビティ84a,8
4b内に射出される。このとき、逆流防止リング83の
図において上方に位置する端面がプランジャ82に密着
し、可塑化装置20側へ樹脂が逆流するのを防ぐ。射出
が完了したら、油圧シリンダ74の可動ロッド75を後
退し、以後上記の動作を繰り返す。
Next, the opening / closing means for the passages 81a and 81b is opened to extend the movable rod 75 of the hydraulic cylinder 74.
By doing so, the plunger 82 is pushed by the end surface 76b of the pressing member 76 and moves forward, so that the resin in each measuring cylinder 81 is respectively filled with the cavities 84a, 8a.
It is injected into 4b. At this time, the end surface of the backflow prevention ring 83, which is located above in the drawing, is in close contact with the plunger 82, and prevents the resin from backflowing toward the plasticizing device 20 side. When the injection is completed, the movable rod 75 of the hydraulic cylinder 74 is retracted, and the above operation is repeated thereafter.

【0024】以上のような射出成形機にあっては、可塑
化装置20によって可塑化された樹脂を、各計量シリン
ダ81内で各キャビティ84a,84bの容量に応じて
計量することができ、そして、これら計量した樹脂を油
圧シリンダ74によって各キャビティ84a,84bに
同時に射出完了することができる。したがって、バリの
発生などがない良好な成形を行うことができる。また、
プランジャ82に逆流防止リング83を設けたので、樹
脂をキャビティ84a,84b内へ射出する際、樹脂が
可塑化装置20側に逆流することがない。さらに、構造
が簡単であるため安価に製作することができる利点があ
る。
In the injection molding machine as described above, the resin plasticized by the plasticizing device 20 can be measured in each measuring cylinder 81 according to the capacity of each cavity 84a, 84b, and The injection of these measured resins into the cavities 84a and 84b can be completed simultaneously by the hydraulic cylinder 74. Therefore, good molding can be performed without causing burrs. Also,
Since the backflow prevention ring 83 is provided on the plunger 82, the resin does not flow back to the plasticizer 20 side when the resin is injected into the cavities 84a and 84b. Further, since the structure is simple, there is an advantage that it can be manufactured at low cost.

【0025】[0025]

【発明の効果】以上説明したように、本発明に係る射出
成形機は、可塑化装置で可塑化された樹脂を金型のキャ
ビティに射出して成形する射出成形機であって、可塑化
装置と金型のキャビティとの間にそれらに連絡して設け
られた複数の計量シリンダを有するシリンダ部材と、上
記各計量シリンダにそれぞれ個々に嵌入されたプランジ
ャと、各プランジャの外端面に各プランジャの長さ方向
に調節自在に螺合された調節ボルトと、上記各調節ボル
トの頭部を当接させて上記各プランジャの各計量シリン
ダからの後退移動を止めるストッパと、上記各調節ボル
トを貫通孔に挿通させた押圧部材を各プランジャの外端
面に押し当てて上記各プランジャを各計量シリンダ内で
前進移動させ各計量シリンダ内の樹脂を同時に各キャビ
ティに射出する射出移動手段とを具備した構成とされて
いるので、調節ボルトの調節でキャビティの容量に計量
シリンダの樹脂量を正確かつ簡単に一致させることがで
きる。したがって、バリ等の発生を防止することができ
る。また、特別な制御系を必要とせず、構造も簡単であ
る。
As described above, the injection molding machine according to the present invention is an injection molding machine for injecting the resin plasticized by the plasticizing device into the cavity of the mold to mold it. Cylinder member having a plurality of measuring cylinders provided in communication with them between the mold and the cavity of the mold, the plunger individually fitted to each of the measuring cylinders, and the plunger of the outer end face of each plunger. Adjusting bolts that are freely screwed in the length direction, stoppers that abut the heads of the adjusting bolts to stop the backward movement of the plungers from the measuring cylinders, and the adjusting bolts through holes. The pressing member inserted into the plunger is pressed against the outer end surface of each plunger to move the plungers forward in each measuring cylinder to simultaneously inject the resin in each measuring cylinder into each cavity. Because it is to have and a moving means configured, the resin amount of the metering cylinder to a volume of the cavity in the regulation of adjusting bolt can be matched accurately and easily. Therefore, it is possible to prevent the occurrence of burrs and the like. Moreover, a special control system is not required and the structure is simple.

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

【図1】 本発明の第1実施例を示す図であって、概略
構成を示す断面図である。
FIG. 1 is a diagram showing a first embodiment of the present invention and is a sectional view showing a schematic configuration.

【図2】 本発明の第2実施例を示す図であって、概略
構成を示す断面図である。
FIG. 2 is a view showing a second embodiment of the present invention and is a sectional view showing a schematic configuration.

【図3】 従来の射出成形機を示す図であって、概略構
成を示す断面図である。
FIG. 3 is a view showing a conventional injection molding machine, and a sectional view showing a schematic configuration.

【符号の説明】[Explanation of symbols]

20 可塑化装置 70,80 シリンダ部材 71,81 計量シリンダ 72,82 プランジャ 72a,82c 外端面 73 調節ボルト 73a 頭部 74 油圧シリンダ(射出移動手段) 76 押圧部材 77 ストッパ 78a,78b,78c,78d,84a,84b キ
ャビティ
20 Plasticizer 70, 80 Cylinder member 71, 81 Measuring cylinder 72, 82 Plunger 72a, 82c Outer end surface 73 Adjusting bolt 73a Head 74 Hydraulic cylinder (injection moving means) 76 Pressing member 77 Stopper 78a, 78b, 78c, 78d, 84a, 84b cavity

───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 亘 新潟県長岡市城岡2丁目5番1号 株式会 社新潟鉄工所長岡工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Wataru Sato 2-5-1 Shirooka, Nagaoka City, Niigata Prefecture Niigata Iron Works Nagaoka Factory

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 可塑化装置(20)で可塑化された樹脂
を金型のキャビティ(78a,78b,78c,78
d、84a,84b)に射出して成形する射出成形機で
あって、可塑化装置(20)と金型のキャビティ(78
a,78b,78c,78d、84a,84b)との間
にそれらに連絡して設けられた複数の計量シリンダ(7
1、81)を有するシリンダ部材(70、80)と、上記
各計量シリンダ(71、81)にそれぞれ個々に嵌入され
たプランジャ(72、82)と、各プランジャ(72、8
2)の外端面(72a、82c)に各プランジャ(72、8
2)の長さ方向に調節自在に螺合された調節ボルト(7
3)と、上記各調節ボルト(73)の頭部(73a)を当接
させて上記各プランジャ(72、82)の各計量シリンダ
(71、81)からの後退移動を止めるストッパ(77)
と、上記各調節ボルト(73)を貫通孔(76a)に挿通さ
せた押圧部材(76)を各プランジャ(72、82)の外端
面(72a、82c)に押し当てて上記各プランジャ(7
2、82)を各計量シリンダ(71、81)内で前進移動
させ各計量シリンダ(71、81)内の樹脂を同時に各キ
ャビティ(78a,78b,78c,78d、84a,
84b)に射出する射出移動手段(74)とを具備したこ
とを特徴とする射出成形機。
1. Cavities (78a, 78b, 78c, 78) of a mold are made of resin plasticized by a plasticizer (20).
d, 84a, 84b) for injection molding, which comprises a plasticizer (20) and a mold cavity (78).
a, 78b, 78c, 78d, 84a, 84b) and a plurality of measuring cylinders (7) provided in communication with them.
1, 81), a plunger (72, 82) individually fitted into each of the measuring cylinders (71, 81), and a plunger (72, 8).
2) The outer end faces (72a, 82c) of each plunger (72, 8c
2) Adjusting bolt (7) that is screwed in the length direction
3) and the heads (73a) of the adjusting bolts (73) are brought into contact with each other, and the measuring cylinders of the plungers (72, 82) are measured.
Stopper (77) to stop the backward movement from (71, 81)
And the pressing member (76) having the adjusting bolts (73) inserted in the through holes (76a) is pressed against the outer end surfaces (72a, 82c) of the plungers (72, 82).
2, 82) are moved forward in the respective measuring cylinders (71, 81) to simultaneously move the resin in the respective measuring cylinders (71, 81) into the respective cavities (78a, 78b, 78c, 78d, 84a,
An injection molding machine comprising an injection moving means (74) for injecting into 84b).
JP5375994A 1994-03-24 1994-03-24 Injection molding machine Expired - Fee Related JPH0780224B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5375994A JPH0780224B2 (en) 1994-03-24 1994-03-24 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5375994A JPH0780224B2 (en) 1994-03-24 1994-03-24 Injection molding machine

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP1293300A Division JPH0671740B2 (en) 1988-11-21 1989-11-10 Injection molding machine

Publications (2)

Publication Number Publication Date
JPH0768607A true JPH0768607A (en) 1995-03-14
JPH0780224B2 JPH0780224B2 (en) 1995-08-30

Family

ID=12951752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5375994A Expired - Fee Related JPH0780224B2 (en) 1994-03-24 1994-03-24 Injection molding machine

Country Status (1)

Country Link
JP (1) JPH0780224B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014191294A1 (en) * 2013-05-31 2014-12-04 Acrilux - S.P.A. Injection molding machine with shooting pots
CN115972482A (en) * 2023-03-17 2023-04-18 广东省新谷塑业包装有限公司 Supercharged multi-cavity confluence injection molding method for plastic packaging products for cosmetics

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014191294A1 (en) * 2013-05-31 2014-12-04 Acrilux - S.P.A. Injection molding machine with shooting pots
CN115972482A (en) * 2023-03-17 2023-04-18 广东省新谷塑业包装有限公司 Supercharged multi-cavity confluence injection molding method for plastic packaging products for cosmetics

Also Published As

Publication number Publication date
JPH0780224B2 (en) 1995-08-30

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