JP2000202870A - Injection molding die - Google Patents
Injection molding dieInfo
- Publication number
- JP2000202870A JP2000202870A JP11006682A JP668299A JP2000202870A JP 2000202870 A JP2000202870 A JP 2000202870A JP 11006682 A JP11006682 A JP 11006682A JP 668299 A JP668299 A JP 668299A JP 2000202870 A JP2000202870 A JP 2000202870A
- Authority
- JP
- Japan
- Prior art keywords
- runner
- mold
- die
- product
- gas
- 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
- 238000001746 injection moulding Methods 0.000 title claims abstract description 13
- 230000035699 permeability Effects 0.000 claims abstract description 6
- 238000013022 venting Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 abstract description 17
- 229920005989 resin Polymers 0.000 abstract description 17
- 238000007872 degassing Methods 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 20
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 210000002310 elbow joint Anatomy 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 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
- B29C45/2701—Details not specific to hot or cold runner channels
-
- 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
- B29C45/34—Moulds having venting means
- B29C45/345—Moulds having venting means using a porous mould wall or a part thereof, e.g. made of sintered metal
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、管継手などを射出
成形するための成形金型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for injection-molding a pipe joint or the like.
【０００２】[0002]
【従来の技術】従来、管継手用の射出成形用金型とし
て、たとえば特公昭５４−７０３３号公報において、固
定金型と移動金型と中子とからなり、固定金型および移
動金型の内面と中子の外面とで形成された金型キャビテ
イ（隙間）内に、固定金型に設けられた樹脂注入口から
塩化ビニル樹脂などの溶融樹脂を射出注入し、この溶融
樹脂を冷却・固化したのち、移動金型および中子を移動
させて成形品を取り出すようにした射出成形用金型が知
られている。2. Description of the Related Art Conventionally, as an injection molding mold for a pipe joint, for example, Japanese Patent Publication No. 54-7033 discloses a fixed mold, a movable mold and a core. A molten resin such as vinyl chloride resin is injected and injected into a mold cavity (gap) formed between the inner surface and the outer surface of the core from a resin injection port provided in a fixed mold, and the molten resin is cooled and solidified. After that, there is known an injection molding die in which a movable die and a core are moved to remove a molded product.
【０００３】ところで、特に塩化ビニル樹脂の場合は、
溶融時の溶融温度を高くしすぎた場合、熱分解などが生
じやすいため、射出成形時にガスが発生することにな
る。そして、一般的には、固定金型と移動金型の合わせ
面の一部に０．０３〜０．０５ｍｍの隙間を設けたり、
あるいは固定金型と移動金型の合わせ面に全周約０．５
ｍｍ程度の溝を設け、この隙間や溝を通じて、射出成形
時に発生したガスを金型外に逃がすようにしている。By the way, especially in the case of vinyl chloride resin,
If the melting temperature at the time of melting is too high, thermal decomposition or the like is likely to occur, so that gas is generated during injection molding. And, generally, a gap of 0.03 to 0.05 mm is provided in a part of the mating surface of the fixed mold and the movable mold,
Alternatively, the entire circumference of the fixed mold and movable mold
A groove of about mm is provided, and gas generated during injection molding is released to the outside of the mold through this gap or groove.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記ガ
ス抜き手段を有する従来の金型においては、固定金型と
移動金型の合わせ面に対して直交する向きに溶融樹脂を
注入する金型構造にした場合、ウエルド面側において溜
まったガスを型の合わせ面を通じて金型外に排出するこ
とができなかった。However, in the conventional mold having the above-mentioned gas releasing means, the mold structure for injecting the molten resin in a direction perpendicular to the mating surface of the fixed mold and the movable mold is used. In this case, the gas accumulated on the weld surface side could not be discharged out of the mold through the mating surface of the mold.
【０００５】このため、固定金型および移動金型の内面
と中子の外面とで形成される金型キャビテイ内への溶融
樹脂の充填不良が生じて、良好な成形品が得られず、生
産性が低下するという問題があった。特に多数個取りの
金型になった場合、ランナに残っている残存空気量や溶
融樹脂から発生するガス量が多くなるので、ガス抜き手
段としては不十分であった。[0005] As a result, defective filling of the molten resin into the mold cavity formed by the inner surface of the fixed mold and the movable mold and the outer surface of the core occurs, and a good molded product cannot be obtained. There is a problem that the property is reduced. In particular, in the case of a multi-cavity mold, the amount of residual air remaining in the runner and the amount of gas generated from the molten resin increase, so that it is insufficient as a gas removing means.
【０００６】本発明の目的は、溶融樹脂の注入口の向き
に依存せず、金型キャビテイ内のガスや空気を金型外に
スムーズに排出できることで、溶融樹脂の流れ特性が良
くなり、生産性が向上する射出成形用金型を提供するこ
とである。SUMMARY OF THE INVENTION It is an object of the present invention to improve the flow characteristics of a molten resin by smoothly discharging gas and air in a mold cavity to the outside of the mold without depending on the direction of a molten resin inlet. An object of the present invention is to provide a mold for injection molding having improved properties.
【０００７】[0007]
【課題を解決するための手段】請求項１記載の発明の射
出成形用金型は、固定金型と移動金型と中子とからなる
射出成形用金型において、ランナの製品凹部側の近傍
に、通気性を有するガス抜き部材が設けられ、このガス
抜き部材が金型外部と連通されているものである。According to a first aspect of the present invention, there is provided an injection mold comprising a fixed mold, a movable mold, and a core, the vicinity of which is close to a product recess side of a runner. Is provided with a gas vent member having air permeability, and this gas vent member is communicated with the outside of the mold.
【０００８】（作用）請求項１記載の発明においては、
金型外部と連通している通気性を有するガス抜き部材が
ランナの製品凹部側の近傍に設けられているので、成形
時に発生したガスや空気はガス抜き部材を通じて金型外
部に排出される。このため、溶融樹脂の充填不良が発生
せず、良好な製品が得られ生産性が向上する。(Function) In the invention described in claim 1,
Since a gas venting member having air permeability communicating with the outside of the mold is provided near the product concave side of the runner, gas and air generated during molding are discharged to the outside of the mold through the gas venting member. For this reason, a defective filling of the molten resin does not occur, a good product is obtained, and the productivity is improved.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は本発明の射出成形用金型の
一例を示す固定側外型の要部上面図、図２は図１の通気
性を有する金属部材を示す縦断面図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a top view of a main part of a fixed outer mold showing an example of the injection molding die of the present invention, and FIG. 2 is a longitudinal sectional view showing the air-permeable metal member of FIG.
【００１０】図１において、１は固定側外型であり、硬
質塩化ビニル樹脂製のベンド継手の１６個取り用のもの
である。なお、移動側の外型と内型である中子は省略し
ている。固定側外型１の上面には、ランナ２、ゲート３
および製品部の下半分外面に対応した１６個の製品凹部
４が凹設されている。なお、図面では４個の製品凹部４
を図示している。In FIG. 1, reference numeral 1 denotes a fixed-side outer die for picking up 16 bend joints made of hard vinyl chloride resin. The outer and inner cores on the moving side are omitted. On the upper surface of the fixed outer mold 1, a runner 2, a gate 3
In addition, 16 product recesses 4 corresponding to the lower half outer surface of the product section are provided. In the drawing, four product recesses 4 are shown.
Is illustrated.
【００１１】ランナ２は射出成形機よりノズルを通じて
注入される溶融樹脂の湯道であり、半円状の断面形状を
有している。ランナ２の製品凹部４側に位置する各箇所
には通気性を有するガス抜き部材５が設けられている。
このガス抜き部材５はステンレス製のものであり、図２
に示すように、緻密な短円筒体５１の内部に固着された
焼結短円柱体５２とからなっている。この焼結短円柱体
５２は短円筒体５１の軸心方向に孔径が約０．０５〜
０．２ｍｍの多数の微細な通孔を有している。なお、ガ
ス抜き部材５は固定側外型１の下側にて金型の外部と連
通するように設置されている。The runner 2 is a runner for molten resin injected from an injection molding machine through a nozzle, and has a semicircular cross-sectional shape. A gas venting member 5 having air permeability is provided at each location of the runner 2 located on the product recess 4 side.
This degassing member 5 is made of stainless steel, as shown in FIG.
As shown in FIG. 5, a sintered short cylindrical body 52 is fixed inside a dense short cylindrical body 51. The sintered short cylindrical body 52 has a hole diameter of about 0.05 to 0.05 in the axial direction of the short cylindrical body 51.
It has a number of fine through holes of 0.2 mm. The degassing member 5 is installed below the fixed outer mold 1 so as to communicate with the outside of the mold.
【００１２】上記のとおり、エルボ継手などを射出成形
する際、ランナ２に残存している空気量や溶融樹脂から
発生したガス量が多くなっても、これらのガスはランナ
２の製品凹部４側の手前位置に設置されたガス抜き部材
５の微細な通孔を通じて金型の外部に放出されることに
なる。このように、上記実施例の金型は多数個取り用の
射出成形用金型としてすぐれたものである。As described above, when an elbow joint or the like is injection-molded, even if the amount of air remaining in the runner 2 or the amount of gas generated from the molten resin increases, these gases remain on the product recess 4 side of the runner 2. Is released to the outside of the mold through the fine through-hole of the gas release member 5 installed at a position just before. As described above, the mold of the above embodiment is excellent as a mold for multi-cavity injection molding.
【００１３】[0013]
【発明の効果】請求項１記載の本発明においては、成形
時に発生するガスや空気は、ランナの製品凹部側の近傍
に設けられた通気性を有するガス抜き部材を通じて金型
外部に排出されるので、溶融樹脂の充填不良が発生せ
ず、かつ、溶融樹脂の流れ特性が良くなるので、不良成
形品が発生せず、生産性が向上する。According to the first aspect of the present invention, gas and air generated at the time of molding are discharged to the outside of the mold through a gas permeable vent member provided near the product concave side of the runner. As a result, no defective filling of the molten resin occurs, and the flow characteristics of the molten resin are improved.
【図１】本発明の射出成形用金型の一実施例を示す要部
上面図である。FIG. 1 is a main part top view showing one embodiment of an injection mold according to the present invention.
【図２】図１のガス抜き部材を示す拡大縦断面図であ
る。FIG. 2 is an enlarged vertical sectional view showing the gas venting member of FIG.
１ 固定側外型 ２ ランナ ３ ゲート ４ 製品凹部 ５ ガス抜き部材 ５１ 緻密な短円筒体 ５２ 焼結短円柱体 DESCRIPTION OF SYMBOLS 1 Fixed outer mold 2 Runner 3 Gate 4 Product concave part 5 Gas release member 51 Dense short cylindrical body 52 Sintered short cylindrical body
Claims (1)
出成形用金型において、ランナの製品凹部側の近傍に通
気性を有するガス抜き部材が設けられ、このガス抜き部
材が金型外部と連通されていることを特徴とする射出成
形用金型。1. An injection molding die comprising a stationary die, a movable die and a core, a gas venting member having air permeability is provided in the vicinity of a product concave side of a runner, and the gas venting member is formed of a metal. An injection molding die, which is in communication with the outside of the die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11006682A JP2000202870A (en) | 1999-01-13 | 1999-01-13 | Injection molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11006682A JP2000202870A (en) | 1999-01-13 | 1999-01-13 | Injection molding die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000202870A true JP2000202870A (en) | 2000-07-25 |
Family
ID=11645144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11006682A Pending JP2000202870A (en) | 1999-01-13 | 1999-01-13 | Injection molding die |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000202870A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2828433A1 (en) * | 2001-08-10 | 2003-02-14 | Robert Aizier | Vacuum moulding apparatus, has opening/closing systems in injection channels between moulding chamber and vacuum pump |
| EP3078470A1 (en) * | 2015-04-10 | 2016-10-12 | Matsuura Machinery Corporation | Mold for resin injection molding |
| CN112388916A (en) * | 2020-10-20 | 2021-02-23 | 立讯电子科技（昆山）有限公司 | Product direct forming die |
-
1999
- 1999-01-13 JP JP11006682A patent/JP2000202870A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2828433A1 (en) * | 2001-08-10 | 2003-02-14 | Robert Aizier | Vacuum moulding apparatus, has opening/closing systems in injection channels between moulding chamber and vacuum pump |
| EP3078470A1 (en) * | 2015-04-10 | 2016-10-12 | Matsuura Machinery Corporation | Mold for resin injection molding |
| CN112388916A (en) * | 2020-10-20 | 2021-02-23 | 立讯电子科技（昆山）有限公司 | Product direct forming die |
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