JP4474617B2 - Injection machine for injection molding machine - Google Patents

Injection machine for injection molding machine Download PDF

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JP4474617B2
JP4474617B2 JP2007129988A JP2007129988A JP4474617B2 JP 4474617 B2 JP4474617 B2 JP 4474617B2 JP 2007129988 A JP2007129988 A JP 2007129988A JP 2007129988 A JP2007129988 A JP 2007129988A JP 4474617 B2 JP4474617 B2 JP 4474617B2
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flow path
nozzle
needle valve
plunger
injection
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JP2008284730A (en
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伯美 江藤
博之 都
潤也 佐藤
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株式会社メイホー
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    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • B29C45/542—Means 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
    • 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
    • B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

本発明は、スクリュープリプラ方式の射出成形機に係り、特に射出装置に関する。   The present invention relates to an injection molding machine of a screw prepla system, and more particularly to an injection apparatus.

スクリュープリプラ方式は、可塑化専用スクリューで成形材料を可塑化させ、 これをプランジャ前部へ送り込み計量を行い、その後に前記プランジャを前進させ、
ノズルから金型へ流し込む射出をさせる、射出成形機の射出方式の一つである。 The screw prepla system plasticizes the molding material with a plasticizing screw, sends it to the front part of the plunger, measures it, and then advances the plunger.
This is one of the injection methods of an injection molding machine in which injection is performed by pouring from a nozzle into a mold.

このスクリュープリプラ方式の射出装置は、 ノズルの内部に形成され金型に到る第２の流路と、 プランジャ前部から前記第２の流路に連結された第３の流路と、
スクリューから前記プランジャ前部に到る第１の流路を有する。 This screw pre-pull type injection device includes a second flow path formed inside a nozzle and reaching a mold, a third flow path connected to the second flow path from a plunger front portion,
A first flow path from the screw to the front of the plunger is provided.

一般的なスクリュープリプラ方式のノズル吐出口は、 常時開放している構造のものと、 開閉機構を設けて計量時に閉鎖し、 ノズル吐出口からの成形材料の漏れ防止対策や、
成形材料に加わる圧力の応答性向上対策を施したものがある。 General screw prep plastic type nozzle outlets have a structure that is always open, and an open / close mechanism that closes when metering to prevent leakage of molding material from the nozzle outlet,
Some measures have been taken to improve the responsiveness of the pressure applied to the molding material.

また、第１の流路には、 開閉機構を設けて射出時に閉鎖し、 成形材料の逆流防止対策や、 成形材料に加わる圧力の応答性向上対策が施される。   In addition, the first flow path is provided with an opening / closing mechanism and closed at the time of injection, and measures for preventing the backflow of the molding material and measures for improving the responsiveness of the pressure applied to the molding material are taken.

各々の開閉機構には、バルブが利用され、 止め弁やニードル弁、コック、ボール逆止弁やリフト逆止弁などを施したものがある。 また、ノズル吐出口と第１の流路の開閉機構は、
それぞれ独立した構造であるために、射出装置を大きくしている。 Each open / close mechanism uses a valve and includes a stop valve, needle valve, cock, ball check valve, lift check valve, and the like. Moreover, the opening and closing mechanism of the nozzle outlet and the first flow path is:
Since each has an independent structure, the injection device is enlarged.

近年では、成形品の高精度化且つ射出成形機の小型化が求められ、 射出装置においては、ノズル吐出口と第１の流路の開閉機構の小型化、 且つ性能の維持、向上について研究開発が進められている。   In recent years, there has been a demand for higher precision of molded products and downsizing of injection molding machines. In injection devices, research and development have been conducted on downsizing and maintaining and improving performance of the opening and closing mechanism of the nozzle outlet and the first flow path. Is underway.

従来の射出装置は、構造が複雑で部品点数も多く、 小型化と成形材料へ加わる圧力の応答性向上については、 両立が困難とされており、その解決策が必要とされている。
特開平７−２２３２４１号公報 特開平１１−３２０６１２号公報 特開平１１−１５６９０２号公報 特開平１０−２７８０８１号公報 Conventional injection devices have a complicated structure and a large number of parts, and it is difficult to achieve both miniaturization and improved response to pressure applied to molding materials, and solutions are needed.
JP-A-7-223241 Japanese Patent Laid-Open No. 11-320612 Japanese Patent Laid-Open No. 11-156902 Japanese Patent Laid-Open No. 10-278081

本発明は、以上のような従来の射出成形機の問題点に鑑み成されたもので、 本発明の目的は、射出成形機の小型化が可能で、 且つノズル吐出口と第１の流路の開閉機構の性能を維持させた、
射出装置を提供することにある。 The present invention has been made in view of the problems of the conventional injection molding machine as described above, and an object of the present invention is to reduce the size of the injection molding machine, and to provide a nozzle discharge port and a first flow path. Maintained the performance of the opening and closing mechanism,
It is to provide an injection device.

上記課題を解決するため、本願請求項１に係る発明は、 第２の流路を形成したノズルと、 前記ノズルの吐出口を開閉する端部を形成したニードルバルブと、
前記ニードルバルブを駆動させるアクチュエーターと、 第３の流路と第１の流路を形成したマニホールドと、 を備えたスクリュープリプラ方式の射出成形機において、
前記第１の流路が前記ニードルバルブを通過し、 且つその通過部の前記ニードルバルブに前記第１の流路を開閉する逆止弁部を設けたものである。 In order to solve the above-mentioned problem, the invention according to claim 1 of the present application includes: a nozzle that forms a second flow path;
In a screw prep plastic type injection molding machine comprising: an actuator that drives the needle valve; and a manifold that forms a third flow path and a first flow path.
The first flow path passes through the needle valve, and a check valve portion that opens and closes the first flow path is provided in the needle valve in the passage portion.

この本発明の射出成形機の射出装置では、 一つのアクチュエーターと一つのニードルバルブによって、 ノズル吐出口と第１の流路の開閉機能を兼ね備えることから、
構造が簡素化され部品点数も少なく、小型化を図れる。 In the injection apparatus of the injection molding machine of the present invention, since one actuator and one needle valve combine the function of opening and closing the nozzle discharge port and the first flow path,
The structure is simplified, the number of parts is small, and the size can be reduced.

また、本発明の射出装置は、 ニードルバルブを駆動させるアクチュエーターによって能動的に流路を閉鎖することから、 成形材料の圧力を利用して受動的に流路が閉鎖される装置と比較して、
計量時と射出時に成形材料へ加わる圧力の応答性を向上するという効果を発揮する。 In addition, the injection device of the present invention actively closes the flow path by an actuator that drives a needle valve, so compared to a device that passively closes the flow path using the pressure of the molding material,
It exhibits the effect of improving the responsiveness of pressure applied to the molding material during weighing and injection.

以下、本発明の実施の形態を図１〜図４に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

図１において、加熱シリンダ３は成形材料を入れ加熱するための筒状のハウジングであり、スクリュー２は加熱シリンダ３内で回転することによって成形材料を移送、溶融、混練する螺旋状の溝を持つ軸である。
ポット１４は加熱シリンダ３の下方にあり、成形材料を金型に射出する棒状ピストンのプ ランジャ１を挿入する筒状のハウジングである。
ノズル１０はマニホールド１２の下部に取り付けられ、成形材料を金型に導く第２の流路 ２３を形成した導管である。
マニホールド１２は加熱シリンダ３とポット１４とノズル１０を固定し、且つ内部にプランジャ前部２０からノズル１０に到る第３の流路２２とスクリュー２からプランジャ前部２０に到る第１の流路２３を形成し、加熱シリンダ３とポット１４とノズル１０はマニホ ールド１２を介して成形材料を連絡する。
エアーシリンダ１３はマニホールド１２の上部に設置されたニードルバルブ１１を上下駆 動させる為のアクチュエーターである。
ニードルバルブ１１はマニホールド１２の上部に設置されたエアーシリンダ１３に接続さ れ、マニホールド１２の上部から第１の流路２３、第２の流路２１、第３の流路２２を通 り、ノズル吐出口１０ａまで到る針状の流路開閉弁である。 In FIG. 1 , a heating cylinder 3 is a cylindrical housing for charging and heating a molding material, and a screw 2 has a spiral groove for rotating, melting and kneading the molding material by rotating in the heating cylinder 3. Is the axis.
Pot 14 is below the heating cylinder 3 is a cylindrical housing for inserting the flop plunger 1 rod-shaped piston injection molding material into the mold.
The nozzle 10 is a conduit that is attached to the lower portion of the manifold 12 and forms a second flow path 23 that guides the molding material to the mold .
The manifold 12 fixes the heating cylinder 3, the pot 14, and the nozzle 10, and has a third flow path 22 extending from the plunger front portion 20 to the nozzle 10 and a first flow extending from the screw 2 to the plunger front portion 20. the road 23 is formed, the heating cylinder 3 and the pot 14 and the nozzle 10 will contact the molding material through the manifold 12.
Air cylinder 13 is actuator for causing the moving drive vertically the needle valve 11 installed in the upper portion of the manifold 12.
Needle valve 11 is connected to an air cylinder 13 installed on the top of the manifold 12, the first flow path 23 from the top of the manifold 12, the second flow path 21, Ri through the third channel 22, the nozzle This is a needle-like channel opening / closing valve that reaches the discharge port 10a.

上記を有したスクリュープリプラ方式の射出成形機は、プランジャ１は横方向に設置さ れ、ノズル１０は縦方向に設置される横プランジャー竪射出の射出装置である。   The screw pre-pull type injection molding machine having the above is an injection device for horizontal plunger soot injection in which the plunger 1 is installed in the horizontal direction and the nozzle 10 is installed in the vertical direction.

ニードルバルブ１１は、ノズル１０内部から上方に伸びマニホールド１２を貫通し、 且つマニホールド１２の上部に設置されたエアーシリンダ１３によって上下駆動させられる。
また第１の流路２３の一部は、ニードルバルブ１１を通過し、 その通過部におけるニードルバルブ１１は、 円周上からテーパ状に突起されたニードルバルブ逆止弁部１１ｂを形成し、
そのニードルバルブ逆止弁部１１ｂが第１の流路２３を開閉する機能を有する。 The needle valve 11 extends upward from the inside of the nozzle 10, penetrates the manifold 12, and is driven up and down by an air cylinder 13 installed at the top of the manifold 12.
Further, a part of the first flow path 23 passes through the needle valve 11, and the needle valve 11 in the passage portion forms a needle valve check valve portion 11b that protrudes in a tapered shape from the circumference,
The needle valve check valve portion 11 b has a function of opening and closing the first flow path 23.

以下、上記構成の動作を説明する。 エアーシリンダ１３により下降駆動させられたニードルバルブ１１は、 ノズルの吐出口１０ａにニードルバルブの先端１１ａが接触し、ノズル吐出口１０ａを閉鎖し、
且つニードルバルブ逆止弁部１１ｂは、第１の流路２３を開放する。（図３） このとき、射出装置は成形材料をスクリュー２で可塑化させ、 これをプランジャ前部２０へ送り込む計量が可能な状態となり、
予めノズル吐出口１０ａが閉鎖されたことによって、 成形材料が漏れることがなく、 且つ圧力の応答性を向上した計量ができるという効果を得る。 The operation of the above configuration will be described below. The needle valve 11 driven downward by the air cylinder 13 has the tip 11a of the needle valve in contact with the nozzle outlet 10a and closes the nozzle outlet 10a.
The needle valve check valve portion 11b opens the first flow path 23. (FIG. 3) At this time, the injection device plasticizes the molding material with the screw 2 and enters a state where it can be metered into the plunger front portion 20.
Since the nozzle discharge port 10a is closed in advance, there is an effect that the molding material does not leak and the weighing with improved pressure responsiveness can be obtained.

また、エアーシリンダ１３により上昇駆動させられたニードルバルブ１１は、 ノズル吐出口１０ａからニードルバルブの先端１１ａが離れ、 ノズル吐出口１０ａを開放し、
且つニードルバルブ逆止弁部１１ｂは、第１の流路２３を閉鎖する。（図２） このとき、射出装置はプランジャ１を前進させて、 成形材料をプランジャ前部２０からノズル吐出口１０ａへ移送する射出が可能な状態となり、
第１の流路２３が閉鎖されたことによって、 成形材料は逆流しなくなり、 且つ圧力の応答性を向上した射出ができるという効果を得る。 Further, the needle valve 11 driven upward by the air cylinder 13 is separated from the nozzle discharge port 10a by the tip 11a of the needle valve, and opens the nozzle discharge port 10a.
The needle valve check valve portion 11b closes the first flow path 23. (FIG. 2) At this time, the injection device advances the plunger 1 and is in a state where injection is possible to transfer the molding material from the plunger front portion 20 to the nozzle discharge port 10a.
Since the first flow path 23 is closed, the molding material does not flow backward, and an effect of performing injection with improved pressure response is obtained.

この構成における射出装置は、一つのエアーシリンダ１３と一つのニードルバルブ１１によって、第２の流路２１と第１の流路２３の開閉機能を兼ね備えることから、構造が簡素化され部品点数も少なく、小型化を図れる。The injection device in this configuration has a function of opening and closing the second flow path 21 and the first flow path 23 by one air cylinder 13 and one needle valve 11, so the structure is simplified and the number of parts is reduced. And downsizing.

また、この流路の開閉機構は、 ニードルバルブ１１を上下駆動させるエアーシリンダ１３によって能動的に流路を閉鎖することから、 成形材料の圧力を利用して受動的に流路の開閉を行う装置と比較して、
計量時と射出時に成形材料へ加わる圧力の応答性が高くなることから、流路開閉弁の性能を向上する。 In addition, since the flow path opening / closing mechanism actively closes the flow path by the air cylinder 13 that drives the needle valve 11 up and down, the apparatus opens / closes the flow path passively using the pressure of the molding material. Compared to
Since the responsiveness of the pressure applied to the molding material at the time of metering and injection increases, the performance of the flow path opening / closing valve is improved.

なお、ニードルバルブ１１のアクチュエーターは、 エアーシリンダ１３に限定されないことは言うまでもない。
また、本図の構成におけるプランジャ１やノズル１０、ニードルバルブ１１の設置方向においても 、その方向に限定されないことは言うまでもない。
なおまた、射出成形機の基本的な構造において、ノズル１０とマニホールド１２が一体構造になるものや、 ノズル１０とマニホールド１２が更に分割された構造になるものがあることは言うまでもない。
さらに、ニードルバルブ逆止弁部１１ｂについては、逆止弁の機能を持つ構造を有することを示し、 日本工業規格に記載されている、弁体が球状のボール逆止め弁や一般的なリフト逆止め弁であっても、
同様の効果を発揮することは言うまでももない。 Needless to say, the actuator of the needle valve 11 is not limited to the air cylinder 13.
Further, it is needless to say that the direction in which the plunger 1, the nozzle 10 and the needle valve 11 are installed is not limited to that direction.
Needless to say, the basic structure of the injection molding machine includes a structure in which the nozzle 10 and the manifold 12 are integrated, and a structure in which the nozzle 10 and the manifold 12 are further divided.
Further, the needle valve check valve portion 11b indicates that it has a structure having a check valve function, and is described in Japanese Industrial Standards. Even a stop valve
It goes without saying that the same effect is exhibited.

本発明の実施の形態における射出成形機の射出装置の要部概略図である。It is a principal part schematic diagram of the injection apparatus of the injection molding machine in embodiment of this invention. 同射出装置のニードルバルブ上昇時の要部概略図である。It is the principal part schematic when the needle valve of the injection device raises. 同射出装置のニードルバルブ下降時の要部概略図である。It is a principal part schematic diagram at the time of needle valve lowering of the injection device. 同射出装置の流路の概略図である。It is the schematic of the flow path of the injection device.

符号の説明Explanation of symbols

１ プランジャ
２ スクリュー
３ 加熱シリンダ
１０ ノズル
１０ａ ノズル吐出口
１１ ニードルバルブ
１１ａ ニードルバルブ先端
１１ｂ ニードルバルブ逆止弁部
１２ マニホールド
１３ エアーシリンダ
１４ ポット
２０ プランジャ前部
２１ 第２の流路
２２ 第３の流路
２３ 第１の流路 DESCRIPTION OF SYMBOLS 1 Plunger 2 Screw 3 Heating cylinder 10 Nozzle 10a Nozzle discharge port 11 Needle valve 11a Needle valve tip 11b Needle valve check valve part 12 Manifold 13 Air cylinder 14 Pot 20 Plunger front part 21 2nd flow path 22 3rd flow path 23 First flow path

Claims (2)

可塑化した成形材料を供給するスクリューと、前記スクリューから供給される成形材料  Screw for supplying plasticized molding material, and molding material supplied from the screw を計量するプランジャ前部と、成形材料を外部の金型へ射出するノズルと、前記スクリュA plunger front portion for weighing the nozzle, a nozzle for injecting a molding material into an external mold, and the screw ー、前記プランジャ前部、前記ノズルの成形材料流路をつなぐ導管のマニホールドを有し-A manifold for the conduit connecting the front part of the plunger and the molding material flow path of the nozzle 、前記マニホールド内に形成された前記スクリューから前記プランジャ前部に到る第１の, A first leading from the screw formed in the manifold to the plunger front portion 流路と、外部の金型に到る前記ノズル内部に形成された第２の流路と、前記マニホールドA flow path, a second flow path formed inside the nozzle reaching an external mold, and the manifold 内に形成された前記プランジャ前部から前記第２の流路を連結する第３の流路を有する射A gun having a third flow path connecting the second flow path from the front portion of the plunger formed inside the plunger. 出装置において、In the dispensing device,
前記第１の流路と前記第２の流路、前記第３の流路に沿って挿入され上下移動可能な針状Needle shape inserted along the first flow path, the second flow path, and the third flow path and movable up and down のニードルバルブを備え、前記ニードルバルブはその途中にテーパとその頂部で形成されThe needle valve is formed with a taper and its top in the middle. るニードルバルブ逆止弁部を有し、前記ニードルバルブ逆止弁部が前記第１の流路で上下A needle valve check valve portion, and the needle valve check valve portion moves up and down in the first flow path. 移動し、前記第１の流路開放状態と、前記第１の流路閉鎖状態を切り替える射出装置。An injection device that moves and switches between the first channel open state and the first channel closed state. 前記ニードルバルブ先端が針状であって、前記第１の流路開放状態の場合に前記ニード  If the tip of the needle valve is needle-shaped and the first flow path is open, the need ルバルブ先端が前記ノズルの吐出口を閉鎖する請求項１記載の射出装置。The injection device according to claim 1, wherein a valve tip closes a discharge port of the nozzle.
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