JPS5842440A - Degassing apparatus of mold - Google Patents
Degassing apparatus of moldInfo
- Publication number
- JPS5842440A JPS5842440A JP14000281A JP14000281A JPS5842440A JP S5842440 A JPS5842440 A JP S5842440A JP 14000281 A JP14000281 A JP 14000281A JP 14000281 A JP14000281 A JP 14000281A JP S5842440 A JPS5842440 A JP S5842440A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- metal piece
- space
- porous sintered
- sintered metal
- 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
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
- B29C45/34—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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は射出成形機から溶融樹脂を射出して成形する成
形型において、成形型内に閉じ込められる空気或いはガ
スを放出させるための成形型のガス抜装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a degassing device for a mold for releasing air or gas trapped in the mold in a mold for molding by injecting molten resin from an injection molding machine.
一般に射出成形により樹脂成形品を製作する場合に、成
形型の角部或いは丸み部分に空気とかガスが閉じ込めら
れた状態になると、造形された成形品の表面がザラザラ
した所謂ガス焼けと称する（１）
状態になる。そこで、従来は、成形時にガス焼けを生ず
る部分にガス抜孔を形成するとともにガス抜孔内にピン
を若干の隙間を介して収納してガス抜孔とピンとの隙間
から成形型内に閉じ込められた空気或いはガスを外部に
放出するようにしてガス焼けの防止を図るようにしてい
た。しかしながら、斯る従来構造においては、ガス抜孔
とピンとの隙間に溶融樹脂が侵入するために成形品の外
表面にパリを生ずるため仕上加工が面倒な欠点があり、
また成形条件が変化するとガス焼けが生ずる部分が移動
するから、その都度新たにガス抜孔を新設したり哉いは
予め設けるようにしなければならず、非常に製造コスト
が高くなる欠点があった。Generally, when producing resin molded products by injection molding, if air or gas becomes trapped in the corners or rounded parts of the mold, the surface of the molded product becomes rough and this is called gas burn (1). ) to become a state. Conventionally, a gas vent hole is formed in the part where gas burn occurs during molding, and a pin is housed in the gas vent hole with a slight gap between the pins and the air trapped in the mold is released from the gap between the gas vent hole and the pin. Gas burns were prevented by releasing the gas to the outside. However, such a conventional structure has the disadvantage that molten resin enters the gap between the gas vent hole and the pin, causing cracks on the outer surface of the molded product, which makes finishing difficult.
In addition, when the molding conditions change, the part where gas burn occurs moves, so a new gas vent hole must be created each time, or it must be provided in advance, which has the drawback of extremely high manufacturing costs.
本発明は上記事情に檻みてなされたものであり、成形型
内のガス抜き示広い範囲にわたって簡単な構造で達成で
き′て成形品にガス焼けが生ずることがなく、しかも成
形品の外表面にパリを生ずることもなく仕上加工が不要
となる成形型のガス抜装置を提供することを目的とする
。The present invention has been made in view of the above circumstances, and can achieve gas venting within a mold with a simple structure over a wide range, without causing gas burns on the molded product, and furthermore, can eliminate gas burns on the outer surface of the molded product. It is an object of the present invention to provide a degassing device for a forming mold that does not cause flaking and does not require finishing processing.
以下本発明の一実施例について第１図及び第２図を参照
しながら説明する。１は成形品として例えば扇風機の基
台２を成形するための成形型で、コアー型６と、このコ
アー型３を凹部４ａ内に収納したコアー母型４とキャビ
ティ型５とからなるもので、コアー型３の隅角部にコア
ー型５とコアー母型４とのパーティングライン乙に沿っ
て断面が矩形状の四条部７が形成され、その四条部７内
に多孔質焼結金属片８が収納されている。そして、多孔
質焼結金属片８は例えばメツシュ５乃至１５μのステン
レス粉末を焼結して形成している。？！た、コアー型５
、コアー母型４及びキャビティ型５には基台２の表面形
状と合致する形状の四部５ａ。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a mold for molding a base 2 of a fan, for example, as a molded product, and is composed of a core mold 6, a core matrix 4 in which the core mold 3 is housed in a recess 4a, and a cavity mold 5. A four-striped portion 7 having a rectangular cross section is formed at a corner of the core mold 3 along a parting line B between the core mold 5 and the core matrix 4, and a porous sintered metal piece 8 is formed within the four-striped portion 7. is stored. The porous sintered metal piece 8 is formed by, for example, sintering stainless steel powder with a mesh size of 5 to 15 μm. ? ! Core type 5
, the core matrix 4 and the cavity mold 5 have four parts 5a having a shape that matches the surface shape of the base 2.
４１）、５ａを形成して、成形型１内に基台２の形状に
対応する空間９が形成されているが、多孔質焼結金属片
８の空間９に臨む部分には、四部６ａ及び４ｂに連続し
た形状の凹曲面部８ａが設けらレテいる。一方、コアー
型６とコアー母型４との接合部分には成形型１の外部に
連通ずるようにした隙間１０が形成されており、この隙
間１０が多孔質焼結金属片８の凹曲面部８ａの対角線上
に位置（３）
する角部８ｂに連通している。尚、基台２は支柱部２ａ
を一体に有した形状で、成形型１のゲートは支柱部２ａ
の先端部に設けられている。41), 5a are formed, and a space 9 corresponding to the shape of the base 2 is formed in the mold 1, but the portion of the porous sintered metal piece 8 facing the space 9 has four parts 6a and 5a. A concave curved surface portion 8a having a continuous shape is provided on the recessed portion 4b. On the other hand, a gap 10 that communicates with the outside of the mold 1 is formed at the joint between the core mold 6 and the core matrix 4, and this gap 10 forms a concave curved surface of the porous sintered metal piece 8. It communicates with a corner 8b located diagonally (3) of 8a. Note that the base 2 has a support section 2a.
The gate of the mold 1 is connected to the support section 2a.
It is provided at the tip of the
而して、射出成形機からの溶融樹脂がゲートを介して成
形型１の空間９内に矢印Ａで示すように射出されると、
空間９内の空気及びガスは溶融樹脂に押されて矢印Ｂで
示すように多孔質焼結金属片８内及び隙間１０を介して
外部に放出されるようになり、多孔質焼結金属片８の凹
部８ａが溶融樹脂の最終湯口り部分に位置されるから空
気及びガスが空間９内に閉じ込められたまま残って成形
品２の表面にガス焼けを生じさせることはなく全て成形
型１の外部に排出される。When the molten resin from the injection molding machine is injected into the space 9 of the mold 1 through the gate as shown by arrow A,
The air and gas in the space 9 are pushed by the molten resin and are released into the porous sintered metal piece 8 and outside through the gap 10 as shown by arrow B, and the porous sintered metal piece 8 Since the concave portion 8a is located at the final gate of the molten resin, air and gas remain confined in the space 9 and do not cause gas burns on the surface of the molded product 2, and are completely removed from the outside of the mold 1. is discharged.
第３図は本発明の他の実施例を示すものであり、１１は
基台２と異なる形状の扇風機の基台１２を成形するため
の成形型で、コアー型１３とキャビ内に多孔質焼結金属
片１７を収納したもので、この多孔質焼結金属片１７の
一部が基台１２と対応（４）
するように成形型１１内に形成された空間１８の一部表
面を構成しており、また、コアー型１６とキャビティ型
１４の接合部分に隙間１９を形成した構成であり、射出
成形機からの溶融樹脂が空間１８内に矢印Ｃで示すよう
に射出されると、空間１８内の空気及びガスが多孔質焼
結金属片１７内及び隙間１９を介して矢印りで示すよう
に外部に放出されるようにしたものである。FIG. 3 shows another embodiment of the present invention, in which reference numeral 11 is a mold for molding a fan base 12 having a different shape from the base 2, and a core mold 13 and a porous sintered mold are used in the cavity. A piece of porous sintered metal 17 is stored, and a part of this porous sintered metal piece 17 constitutes a part of the surface of a space 18 formed in the mold 11 so as to correspond to the base 12 (4). In addition, a gap 19 is formed at the joint between the core mold 16 and the cavity mold 14, and when molten resin from the injection molding machine is injected into the space 18 as shown by arrow C, the space 18 Air and gas inside the porous sintered metal piece 17 and through the gap 19 are released to the outside as shown by arrows.
本発明は以上の説明から明らかなように、成形型のパー
ティングラインに沿って成形品の一部を造形する表面形
状を有した多孔質焼結金属片を配設して成形型内の空気
或いはガスを外部に放出するようにし九から、ガス抜き
を広い範囲に渡って達成できるから成形条件が変化した
場合でもガス焼けが生ずることはなく、また、多孔質焼
結金属片は空気及びガスは通過させるが表面の粒度が充
分小さいから成形品の外表面にパリを生ずるようなこと
はなく、仕上加工も不要となる成形型のガス抜装置を提
供できる。As is clear from the above description, the present invention has a porous sintered metal piece having a surface shape that forms a part of the molded product along the parting line of the mold, and the air inside the mold is removed. Alternatively, the gas can be released to the outside, and gas release can be achieved over a wide range, so gas burns will not occur even if the molding conditions change. It is possible to provide a degassing device for molds that allows the particles to pass through, but since the particle size on the surface is sufficiently small, no cracks are generated on the outer surface of the molded product, and no finishing processing is required.
第１図及び第２図は本発明の一実施例を示すものであり
、第１図は扇風機の基台（成形品）の斜視図、第２図は
成形型の縦断面図、第３図は本発明の他の実施例を示す
成形型の縦断面図である。
図面中、１は成形型、２は基台（成形品）、６はパーテ
ィングフィン、８は多孔質金属片、９は空間、１０は隙
間、１１は成形型、１２は基台（成形品）、１５はパー
ティングライン、１７は焼結金属片、１８は空間、１９
は隙間である。
出願人 東京芝浦電気株式会社Figures 1 and 2 show one embodiment of the present invention, with Figure 1 being a perspective view of the base (molded product) of the electric fan, Figure 2 being a vertical cross-sectional view of the mold, and Figure 3 being a vertical sectional view of the mold. FIG. 2 is a longitudinal cross-sectional view of a mold showing another embodiment of the present invention. In the drawing, 1 is a mold, 2 is a base (molded product), 6 is a parting fin, 8 is a porous metal piece, 9 is a space, 10 is a gap, 11 is a mold, 12 is a base (molded product) ), 15 is a parting line, 17 is a sintered metal piece, 18 is a space, 19
is a gap. Applicant Tokyo Shibaura Electric Co., Ltd.
Claims (1)
において、成形型のパーティングフィンに沿って成形品
の一部を造形する表面形状を有した多孔質焼結金属片を
配設し、成形時に成形型内に閉じ込められる空気或いは
ガスを前記多孔質焼結金属片を介して外部に放出するよ
うにしてなる成形型のガス抜装置。1. In a mold that injects and molds molten resin from an injection molding machine, a porous sintered metal piece with a surface shape that forms a part of the molded product is arranged along the parting fins of the mold. A mold degassing device configured to release air or gas trapped in the mold during molding to the outside through the porous sintered metal piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14000281A JPS5842440A (en) | 1981-09-04 | 1981-09-04 | Degassing apparatus of mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14000281A JPS5842440A (en) | 1981-09-04 | 1981-09-04 | Degassing apparatus of mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5842440A true JPS5842440A (en) | 1983-03-11 |
Family
ID=15258643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14000281A Pending JPS5842440A (en) | 1981-09-04 | 1981-09-04 | Degassing apparatus of mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842440A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6251415A (en) * | 1985-08-30 | 1987-03-06 | Shoichi Teraoka | Mold assembly to apply vacuum pressure to mold with micropores over the period from start of injection to finish of filling and injection molding therefor |
| JPH0429023U (en) * | 1990-06-29 | 1992-03-09 |
-
1981
- 1981-09-04 JP JP14000281A patent/JPS5842440A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6251415A (en) * | 1985-08-30 | 1987-03-06 | Shoichi Teraoka | Mold assembly to apply vacuum pressure to mold with micropores over the period from start of injection to finish of filling and injection molding therefor |
| JPH0429023U (en) * | 1990-06-29 | 1992-03-09 |
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