JPH09262872A - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPH09262872A JPH09262872A JP7253696A JP7253696A JPH09262872A JP H09262872 A JPH09262872 A JP H09262872A JP 7253696 A JP7253696 A JP 7253696A JP 7253696 A JP7253696 A JP 7253696A JP H09262872 A JPH09262872 A JP H09262872A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- molten resin
- valve
- valve pin
- nozzle
- 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
Links
- 238000002347 injection Methods 0.000 title abstract description 11
- 239000007924 injection Substances 0.000 title abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 238000001746 injection moulding Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 abstract description 4
- 239000000243 solution Substances 0.000 abstract 1
- 239000011343 solid material Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—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
- B29C45/281—Drive means therefor
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、バルブゲートより
溶融樹脂を射出する射出成形金型に関する。TECHNICAL FIELD The present invention relates to an injection molding die for injecting a molten resin from a valve gate.
【０００２】[0002]
【従来の技術】従来、固定側型板と可動側型板とよりな
る射出成形金型において、固定側型板と可動側型板とに
より形成されたキャビティに溶融樹脂を射出する方法の
一つとして、固定側型板側にバルブゲートを設ける手段
が用いられている。2. Description of the Related Art Conventionally, one of the methods for injecting a molten resin into a cavity formed by a fixed-side mold plate and a movable-side mold plate in an injection molding die including a fixed-side mold plate and a movable-side mold plate. As such, a means for providing a valve gate on the fixed-side template side is used.
【０００３】上記のバルブゲート（或いはノズル）より
溶融樹脂をキャビティに射出する射出成形金型として
は、例えば、特公昭６３−１０９０３２号公報に、バル
ブピンの先端部がゲートの中にあり、ノズルのゲートよ
り溶融樹脂がキャビティに射出された後、上記バルブピ
ンがノズルの中央部の孔を貫き、このノズルの中央部の
孔が上記ゲートに達するようにした射出成形金型の例が
記載されている。As an injection molding die for injecting a molten resin into a cavity from the above valve gate (or nozzle), for example, in Japanese Patent Publication No. 63-109032, the tip of the valve pin is inside the gate, An example of an injection molding die is described in which after the molten resin is injected from the gate into the cavity, the valve pin passes through the hole in the center of the nozzle and the hole in the center of the nozzle reaches the gate. .
【０００４】又、その他の例として、特開平３−６９３
２７号公報に、一方の型板内にノズル本体と、このノズ
ル本体内にガイドブッシュとが設けられるとともに、上
記ガイドブッシュ内に、ゲートを開閉する可動ロッドが
その軸方向に移動可能に設けられた射出成形金型の例が
記載されている。As another example, JP-A-3-693
No. 27, a nozzle body is provided in one mold plate, and a guide bush is provided in the nozzle body, and a movable rod for opening and closing a gate is provided in the guide bush so as to be movable in its axial direction. Examples of injection molds are described.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記前
者の特公昭６３−１０９０３２号公報に記載されたバル
ブゲートの構造においては、ノズル内に溶融樹脂の固形
物が堆積すると、バルブピンの作動が阻害され、このバ
ルブピンがゲートを完全に封鎖しきれないため、ゲート
口周囲に残留した溶融樹脂により所謂バリが発生する。
又、上記溶融樹脂の固形物の堆積により、作動不良に起
因するバルブピンが折損するといった問題がある。However, in the structure of the valve gate described in the above Japanese Patent Publication No. 63-109032, the solidification of the molten resin in the nozzle hinders the operation of the valve pin. Since the valve pin cannot completely close the gate, so-called burr is generated by the molten resin remaining around the gate opening.
In addition, there is a problem that the valve pin is broken due to a malfunction due to the accumulation of the solid material of the molten resin.
【０００６】又、上記後者の特開平３−６９３２７号公
報に記載された溶融樹脂の射出用のノズルにおいては、
上記前者の場合と同様に、ゲート周辺（ランド部）に溶
融樹脂の固形物が堆積すると、可動ロッドがゲートを完
全に封鎖しきることができず成形品のゲート周辺にバリ
が発生するといったことが生じる。又、上記固形物がゲ
ート周辺（ランド部）に残されたまま次のショットによ
り成形品を成形すると、固形物が成形品内に混入し、フ
ローマークの原因となるなどの問題がある。Further, in the nozzle for injecting the molten resin described in the latter Japanese Patent Laid-Open No. 3-69327,
As in the former case, if solid material of molten resin accumulates around the gate (land portion), the movable rod cannot completely close the gate and burrs occur around the gate of the molded product. Occurs. Further, if a molded product is molded by the next shot while the solid material is left around the gate (land portion), there is a problem that the solid material is mixed into the molded product and causes a flow mark.
【０００７】本発明は、上記のような問題点に着眼して
なされたものであり、その目的とするところは、これら
の問題点を解消し、バルブピン（或いは可動ロッド）の
損傷がなく、ゲート周辺（ランド部）に生じる溶融樹脂
の固形物の成形品への混入を防止して、バリやフローマ
ークがない良好な射出成形品を得ることが可能なバルブ
ゲートを有する射出成形金型を提供するものである。The present invention has been made in view of the above problems, and an object of the present invention is to solve these problems and to prevent damage to a valve pin (or a movable rod) and a gate. Provide an injection molding die with a valve gate that can prevent the molten resin generated around the periphery (land part) from mixing into the molded product and obtain a good injection molded product without burrs or flow marks. To do.
【０００８】[0008]
【課題を解決するための手段】本発明の射出成形金型に
おいては、固定側型板と可動側型板とにより形成された
キャビティにバルブゲートより溶融樹脂を射出する射出
成形金型において、上記バルブゲートが溶融樹脂が流動
するノズルと、このノズル先端部のゲートをその前後進
により開閉するバルブピンとにより構成され、上記バル
ブピンの先端近傍にはスクリュー溝が螺刻され、且つ、
このバルブピンが回転しながら前進することを特徴とす
る。In the injection mold of the present invention, an injection mold for injecting a molten resin from a valve gate into a cavity formed by a fixed mold plate and a movable mold plate, The valve gate is composed of a nozzle through which the molten resin flows, and a valve pin that opens and closes the gate at the tip of the nozzle by moving forward and backward, and a screw groove is threaded near the tip of the valve pin, and
This valve pin is characterized by advancing while rotating.
【０００９】[0009]
【作用】本発明の射出成形金型においては、バルブピン
の先端近傍には、その前進方向と逆進する方向のスクリ
ュー溝が螺刻され、且つ、このバルブピンが回転しなが
ら前進するようになされているので、ゲート周辺の所謂
ランド部に生成された溶融樹脂の固形物は、ゲートの封
鎖とともに、スクリュー溝を搬送されてノズル内の溶融
樹脂中に戻されることとなり、溶融樹脂の固形物が成形
品へ混入されるのが防止され、バリやフローマークがな
い良好な射出成形品を得ることができる。In the injection mold of the present invention, a screw groove is formed near the tip of the valve pin in the direction opposite to the forward direction of the valve pin, and the valve pin is advanced while rotating. Therefore, the solid material of the molten resin generated in the so-called land around the gate is conveyed along the screw groove and returned to the molten resin in the nozzle together with the sealing of the gate, and the solid material of the molten resin is molded. It is possible to obtain a good injection molded product which is prevented from being mixed into the product and has no burr or flow mark.
【００１０】[0010]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図１は、本発明の射出成形金型の
バルブゲートの一例を示す要部の断面図である。図１に
おいて、上記バルブゲート１０は、キャビティ側の可動
側型板１１と、この可動側型板１１の後方に設けられた
受板１２内に内蔵された状態で設けられている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main part showing an example of a valve gate of an injection mold of the present invention. In FIG. 1, the valve gate 10 is provided as a built-in state in a movable side mold plate 11 on the cavity side and a receiving plate 12 provided behind the movable side mold plate 11.
【００１１】このバルブゲート１０は、溶融樹脂がその
内部を流動するノズル１３と、このノズル１３の先端部
のゲート１４をその前後進により開閉するバルブピン１
５とにより構成されている。The valve gate 10 includes a nozzle 13 through which molten resin flows, and a valve pin 1 for opening and closing a gate 14 at the tip of the nozzle 13 by moving the nozzle forward and backward.
5 and 5.
【００１２】上記バルブピン１５の先端部にはスクリュ
ー溝１５ａが螺刻されて設けられている。更に、上記バ
ルブピン１５の後方には、スクリュー１５ｂが設けら
れ、このスクリュー１５ｂは、その側面に受板１２より
突き出して設けられたガイド１６に螺合されている。A screw groove 15a is provided on the tip of the valve pin 15 by threading. Further, a screw 15b is provided behind the valve pin 15, and the screw 15b is screwed to a guide 16 provided on the side surface thereof so as to project from the receiving plate 12.
【００１３】上記スクリュー１５ｂの後端側には油圧機
構が設けられ、バルブピン１５を前進、後退させること
ができるようになっている。又、バルブピン１５の最後
端にはピストン部１５ｃが設けられ、このピストン部１
５ｃが油圧の作用によりゲート１４側に回転しながら前
進し、バルブピン１５のテーパを有する先端の封鎖部１
５ｄが、ゲート１４を封鎖するようになっている。A hydraulic mechanism is provided on the rear end side of the screw 15b so that the valve pin 15 can be moved forward and backward. Further, a piston portion 15c is provided at the rearmost end of the valve pin 15, and the piston portion 1c
5c is rotated forward to the gate 14 side by the action of hydraulic pressure, and the valve pin 15 has a taper end blocking portion 1
5d blocks the gate 14.
【００１４】以下に、バルブゲート１０の作用を説明す
る。図２は、バルブゲートの作用を説明する要部の断面
図である。射出成形工程において、溶融樹脂のキャビテ
ィへの射出が完了するとともに、油圧機構の作動によ
り、バルブピン１５のピストン部１５ｃが押圧される
と、スクリュー１５ａは、螺合されたガイド１６により
回転力を付与され、図示のように、スクリュー溝１５ａ
を後進させる方向に回転を行う。The operation of the valve gate 10 will be described below. FIG. 2 is a sectional view of an essential part for explaining the function of the valve gate. In the injection molding process, when the injection of the molten resin into the cavity is completed and the piston portion 15c of the valve pin 15 is pressed by the operation of the hydraulic mechanism, the screw 15a imparts a rotational force by the screwed guide 16. And as shown, screw groove 15a
Rotate in the direction to move backward.
【００１５】即ち、バルブピン１５が回転しながら前進
してゆき、ノズル１３のゲート１４内に進入を開始する
と、ゲート１４の周壁に堆積された溶融樹脂の固形物
は、スクリュー溝１５ａ内に取り込まれ、スクリュー１
５の回転とともに、溝内を後方の溶融樹脂が滞留するノ
ズル１３内に戻され、再度溶融状態に還元されることに
なる。That is, when the valve pin 15 moves forward while rotating and starts to enter the gate 14 of the nozzle 13, the solid matter of the molten resin deposited on the peripheral wall of the gate 14 is taken in the screw groove 15a. , Screw 1
With the rotation of 5, the inside of the groove is returned to the inside of the nozzle 13 where the molten resin stays, and is returned to the molten state again.
【００１６】従って、本実施例のバルブゲート１０にお
いては、溶融樹脂の固形物はゲート１４に付着すること
がなく、図３に示すように、ゲート１４はスクリュー１
５により完全に封鎖された状態となる。Therefore, in the valve gate 10 of this embodiment, the solid matter of the molten resin does not adhere to the gate 14, and the gate 14 has the screw 1 as shown in FIG.
The state of 5 is completely blocked.
【００１７】[0017]
【発明の効果】本発明の射出成形金型においては、バル
ブピンの先端近傍に、その前進方向と逆進する方向のス
クリュー溝が螺刻され、且つ、このバルブピンが回転し
ながら前進するようになされているので、ゲート周辺の
所謂ランド部に生成された溶融樹脂の固形物は、ゲート
の封鎖とともに、スクリュー溝を搬送されてノズル内の
溶融樹脂中に戻されることとなり、溶融樹脂の固形物が
成形品へ混入されるのが防止され、バリやフローマーク
がない良好な射出成形品を得ることができる。In the injection molding die of the present invention, a screw groove is formed near the tip of the valve pin in the direction opposite to the forward direction of the valve pin, and the valve pin advances while rotating. Therefore, the solid matter of the molten resin generated in the so-called land portion around the gate is conveyed along the screw groove and returned to the molten resin in the nozzle along with the sealing of the gate. It can be prevented from being mixed into the molded product, and a good injection molded product without burrs and flow marks can be obtained.
【図１】本発明の射出成形金型の一例を示す要部の断面
図。FIG. 1 is a sectional view of a main part showing an example of an injection molding die of the present invention.
【図２】バルブゲートの作用を説明する要部の断面図。FIG. 2 is a sectional view of an essential part for explaining the function of a valve gate.
【図３】ゲート部の断面図。FIG. 3 is a cross-sectional view of a gate portion.
１０ バルブゲート １１ 固定側型板 １２ 受板 １３ ノズル １４ ゲート １５ バルブピン １５ａ スクリュー溝 １５ｂ スクリュー １５ｃ ピストン部 １５ｄ 封鎖部 １６ ガイド 10 Valve Gate 11 Fixed Side Mold Plate 12 Receiving Plate 13 Nozzle 14 Gate 15 Valve Pin 15a Screw Groove 15b Screw 15c Piston Part 15d Blocking Part 16 Guide
Claims (1)
れたキャビティにバルブゲートより溶融樹脂を射出する
射出成形金型において、上記バルブゲートが溶融樹脂が
流動するノズルと、このノズル先端部のゲートをその前
後進により開閉するバルブピンとにより構成され、上記
バルブピンの先端近傍にはスクリュー溝が螺刻され、且
つ、このバルブピンが回転しながら前進することを特徴
とする射出成形金型。1. An injection molding die for injecting a molten resin from a valve gate into a cavity formed by a fixed side mold plate and a movable side mold plate, wherein the valve gate has a nozzle through which the molten resin flows, and a tip of the nozzle. An injection molding die, comprising: a valve pin that opens and closes a gate of a portion by moving forward and backward, a screw groove is screwed in the vicinity of the tip of the valve pin, and the valve pin moves forward while rotating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7253696A JPH09262872A (en) | 1996-03-27 | 1996-03-27 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7253696A JPH09262872A (en) | 1996-03-27 | 1996-03-27 | Injection mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09262872A true JPH09262872A (en) | 1997-10-07 |
Family
ID=13492182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7253696A Pending JPH09262872A (en) | 1996-03-27 | 1996-03-27 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09262872A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6135757A (en) * | 1998-10-16 | 2000-10-24 | Husky Injection Systems Ltd. | Valve gated injection molding system |
| WO2007030913A1 (en) * | 2005-09-16 | 2007-03-22 | Husky Injection Molding Systems Ltd. | Molding system having valve including pump |
| US8062025B2 (en) | 2008-12-19 | 2011-11-22 | Mold-Masters (2007) Limited | Injection molding apparatus having a rotating vane |
| WO2017061998A1 (en) * | 2015-10-07 | 2017-04-13 | Synventive Molding Solutions, Inc. | Injection molding apparatus comprising a fluid channel flow disruption |
| WO2020068285A1 (en) * | 2018-08-17 | 2020-04-02 | Synventive Molding Solutions, Inc. | Disrupted flow through injection molding flow channel |
| CN114555324A (en) * | 2019-10-09 | 2022-05-27 | 东洋制罐株式会社 | Injection molding system |
-
1996
- 1996-03-27 JP JP7253696A patent/JPH09262872A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6135757A (en) * | 1998-10-16 | 2000-10-24 | Husky Injection Systems Ltd. | Valve gated injection molding system |
| WO2007030913A1 (en) * | 2005-09-16 | 2007-03-22 | Husky Injection Molding Systems Ltd. | Molding system having valve including pump |
| US8062025B2 (en) | 2008-12-19 | 2011-11-22 | Mold-Masters (2007) Limited | Injection molding apparatus having a rotating vane |
| WO2017061998A1 (en) * | 2015-10-07 | 2017-04-13 | Synventive Molding Solutions, Inc. | Injection molding apparatus comprising a fluid channel flow disruption |
| CN108367476A (en) * | 2015-10-07 | 2018-08-03 | 圣万提注塑工业（苏州）有限公司 | Injection forming equipment with fluid path disturbance |
| US10493674B2 (en) | 2015-10-07 | 2019-12-03 | Synventive Molding Solutions, Inc. | Fluid channel flow disruption |
| WO2020068285A1 (en) * | 2018-08-17 | 2020-04-02 | Synventive Molding Solutions, Inc. | Disrupted flow through injection molding flow channel |
| CN113165240A (en) * | 2018-08-17 | 2021-07-23 | 圣万提注塑工业（苏州）有限公司 | Interrupted flow through injection molded flow channel |
| CN114555324A (en) * | 2019-10-09 | 2022-05-27 | 东洋制罐株式会社 | Injection molding system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4789318A (en) | Device for manufacturing molded articles of plastics material | |
| US4285661A (en) | Valve nozzle of injection molding machine | |
| DE60011898T2 (en) | INJECTION NOZZLE AND INJECTION MOLDING METHOD | |
| US5409659A (en) | Hollow injection-molding method and pressurized fluid introducing and discharging apparatus therefor | |
| JPH04505294A (en) | Method and system for making hollow bodies from molten resin by injection molding | |
| JPH07108569A (en) | Resin molding method and machine | |
| JPH09262872A (en) | Injection mold | |
| JPH0768601A (en) | Runnerless mold | |
| JPH03193428A (en) | Injection mold | |
| JPH09254192A (en) | Injection molding die | |
| JP2003071886A (en) | Mold for injection molding | |
| JP2004114482A (en) | Two-material molding method in injection molding machine | |
| JP3341334B2 (en) | Cold runner type injection mold | |
| JP3079519B2 (en) | Valve gate device of injection mold | |
| JP2755130B2 (en) | Injection molding machine resin outlet opening / closing mechanism | |
| JP3318959B2 (en) | Injection nozzles for injection molding | |
| JP3168447B2 (en) | Injection molding method | |
| JP3238293B2 (en) | Injection molding method and injection molding machine | |
| JPH10180788A (en) | Gas injection molding and its molding device | |
| JPH11151735A (en) | Ejection device of injection-molded product | |
| JP3359142B2 (en) | Check ring opening and closing device in injection molding machine | |
| JPH04119812A (en) | Back flow preventive device for screw | |
| JPH0713900Y2 (en) | Vacuum die casting equipment | |
| JPH06114894A (en) | Injection mold | |
| JPH091306A (en) | Oxygen substitution die cast method |