JPH0272917A - In-mold vacuum mold - Google Patents
In-mold vacuum moldInfo
- Publication number
- JPH0272917A JPH0272917A JP22462688A JP22462688A JPH0272917A JP H0272917 A JPH0272917 A JP H0272917A JP 22462688 A JP22462688 A JP 22462688A JP 22462688 A JP22462688 A JP 22462688A JP H0272917 A JPH0272917 A JP H0272917A
- Authority
- JP
- Japan
- Prior art keywords
- pin
- mold
- nozzle
- ventilation
- time
- 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
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 238000007666 vacuum forming Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000009423 ventilation Methods 0.000 abstract 6
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000007789 gas Substances 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C45/34—Moulds having venting means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、金型内のガス抜きを行なう型内真空成形用金
型（以下、真空成形用金型と略す）に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-mold vacuum forming mold (hereinafter abbreviated as a vacuum forming mold) for venting gas inside the mold.
射出成形における大きな課題は成形品の精度向上とサイ
クル短縮である。しかし、精度を高めるためには金型の
温度を精密に昇降温させなければならず、必然的にサイ
クルが長くなる問題があった。また、サイクル短縮のた
め金型を一定温度にして成形した場合には、フローマー
ク、ジェツテイング、ウェルドライン、ヒケ等の成形欠
陥が生じ、問題であった。一方、成形のメカニズムが次
第に解明されるに従い、金型内の空気や水、樹脂の千ツ
マー等のガスが、転写性を阻害してることが明らかにな
ってきた。このため、型内をあらかじめ排気してから樹
脂を射出充填する真空成形法が注目を浴びてきた。The major challenges in injection molding are improving the precision of molded products and shortening the cycle. However, in order to improve accuracy, the temperature of the mold must be raised and lowered precisely, which inevitably leads to a longer cycle. Further, when molding is performed at a constant temperature in order to shorten the cycle, molding defects such as flow marks, jetting, weld lines, and sink marks occur, which is a problem. On the other hand, as the mechanism of molding is gradually elucidated, it has become clear that gases such as air, water, and resin particles inside the mold inhibit transferability. For this reason, the vacuum forming method, in which the inside of the mold is evacuated in advance and then injected and filled with resin, has been attracting attention.
ここで、従来から射出前に金型内を真空にする射出成形
方法とその装置が公知である。例えば、特開昭５８−１
９４５２３号公報には、型内を排気して真空状態として
射出成形を行なう方法が開示されている。Here, an injection molding method and an apparatus thereof are conventionally known in which the inside of a mold is evacuated before injection. For example, JP-A-58-1
Japanese Patent No. 94523 discloses a method in which injection molding is performed by evacuating the inside of a mold to create a vacuum state.
しかしながら、上記従来技術は、スプル部を排気する点
についての配慮がされておらず、金型内を高真空化する
点で問題があった。However, the above-mentioned conventional technology does not take into consideration the issue of evacuating the sprue portion, and there is a problem in creating a high vacuum inside the mold.
本発明の目的は、金型内の樹脂が充填されるスプル・ラ
ンナ・ゲート・キャビティを効率良く確実に、排気でき
る真空成形用金型を提供することにある。An object of the present invention is to provide a vacuum forming mold that can efficiently and reliably evacuate the sprue, runner, gate, and cavity filled with resin within the mold.
上記目的は、金型内を排気するための大きな課題となる
。スプルブツシュのノズルタッチ部のシールを確実に行
うことにより達成される。The above objective poses a major challenge in evacuating the inside of the mold. This is achieved by ensuring the sealing of the nozzle touch part of the sprue bush.
即ち、エジェクタピン内に進退可能なピンを設け、排気
時において、該ピンが、スプルブツシュにタッチしてい
る成形機ノズル先端の樹脂充填のための開口部をシール
することにより、金型内を効率良く排気することが可能
となる。In other words, a pin that can move forward and backward is provided in the ejector pin, and during evacuation, the pin seals the opening for resin filling at the tip of the molding machine nozzle that is touching the sprue bushing, thereby making the inside of the mold more efficient. It becomes possible to exhaust air well.
該ピンの主なる役割は、成形機ノズルの開口部をシール
することにある。つまり、スプルブツシュのノズルタッ
チ部のシールは、成形機ノズルをタッチすることにより
可能であるが、これだけでは、排気が進行した際、ノズ
ル先端の樹脂は、減圧下にさらされるため発泡してしま
う。しかし、前記ピンにより、ノズル開口部をシールす
れば、樹脂の発泡を防止することができる。The main role of the pin is to seal the opening of the molding machine nozzle. In other words, the nozzle touch part of the sprue bush can be sealed by touching the nozzle of the molding machine, but if this is done alone, as exhaust progresses, the resin at the tip of the nozzle will be exposed to reduced pressure and will foam. However, if the nozzle opening is sealed with the pin, foaming of the resin can be prevented.
一方、前記ピンの前進動作は、バネ等により機械的に、
或は、成形機の信号を受けて油圧的に動作させることが
できる６また、射出時における後退動作は、射出圧力に
より確実に行いえる。On the other hand, the forward movement of the pin is mechanically performed by a spring or the like.
Alternatively, it can be operated hydraulically in response to a signal from the molding machine6.Furthermore, the retreating operation during injection can be reliably performed by injection pressure.
以下１本発明の一実施例を第１図により説明する。第１
図（ａ）は排気時の金型の断面を示している。１はエジ
ェクタピン、２はエジェクタピン１に設けられた進退可
能なピン、３はピン２を前進させるバネ、４はスプルブ
ツシュ、５および６は入カフ、８および９，１０により
形成されるキャビティ、１１．１２は型内を排気するた
めの排気孔、１３〜１７は型内を密封するためのシール
パツキン、１８はパーティングライン、１９は可動型、
２０は固定型である。An embodiment of the present invention will be described below with reference to FIG. 1st
Figure (a) shows a cross section of the mold during evacuation. 1 is an ejector pin, 2 is a retractable pin provided on the ejector pin 1, 3 is a spring for advancing the pin 2, 4 is a sprue bush, 5 and 6 are entry cuffs, and a cavity formed by 8, 9, and 10; 11.12 is an exhaust hole for exhausting the inside of the mold, 13-17 is a seal gasket for sealing the inside of the mold, 18 is a parting line, 19 is a movable mold,
20 is a fixed type.
次に動作を説明する。まず、成形品を離型した時点で、
ピン２はバネ３の押圧力により前進する。Next, the operation will be explained. First, when the molded product is released from the mold,
The pin 2 moves forward due to the pressing force of the spring 3.
型が閉じて成形機（図示せず）のノズル２１がスプルブ
ツシュ４にタッチすることおよびピン２により、スプル
ブツシュ４の開口部およびノズル２１の開口部は完全に
シールされる。このノズルタッチの信号を受けて、排気
孔１１．１２に連結している真空ポンプ２２が排気を開
始する。そして、型内の真空度が１０−”Ｔｏｒｒ前後
に達した時点で射出を開始する。When the mold is closed and the nozzle 21 of the molding machine (not shown) touches the sprue bush 4 and the pin 2, the opening of the sprue bush 4 and the opening of the nozzle 21 are completely sealed. In response to this nozzle touch signal, the vacuum pump 22 connected to the exhaust hole 11.12 starts evacuation. Injection is started when the degree of vacuum within the mold reaches approximately 10-'' Torr.
ピン２は、射出圧力を受けてエジェクタピン１内を後退
する。第１図（ｂ）は樹脂がキャビティ５゜６に充填さ
れている時の状態を示している。The pin 2 retreats within the ejector pin 1 in response to injection pressure. FIG. 1(b) shows the state when the cavity 5.6 is filled with resin.
また、ピン２のノズル２１と接触する先端の部分断面を
第１図（ｃ）に示す。図に示すピン２の先端形状は、排
気時においては、ノズル２１の開口部を効率良くシール
し、射出時においては、射出圧力を効率良く受け、ピン
２の後退がスムーズに行いえる様に設計しである。Further, a partial cross section of the tip of the pin 2 that contacts the nozzle 21 is shown in FIG. 1(c). The tip shape of the pin 2 shown in the figure is designed to efficiently seal the opening of the nozzle 21 during evacuation, efficiently receive injection pressure during injection, and allow the pin 2 to retreat smoothly. It is.
一方、排気孔の設置であるが、粘性の低い材料の場合、
キャビティから直接排気したのでは、排気孔に材料が入
りこむ。このため、低粘性材料の成形金型は、前記ピン
２に排気溝を設けた。この要部断面を第２図に示す。２
３はピン２に設けた排気溝、２４はエジェクタピン１に
設けた排気孔、２５は可動型に設けた排気孔である。ピ
ン２の排気溝２３は、ピン２が前進している排気時の間
だけ、キャビティ内に連結している（［ａ ］）。この
ため、低粘性材料においても、排気づまりすることなく
成形できた。また、ピン２の内部に排気孔を設けた場合
も同様の成果を得た。On the other hand, regarding the installation of exhaust holes, in the case of materials with low viscosity,
If the air is evacuated directly from the cavity, material will enter the exhaust hole. For this reason, the pin 2 is provided with an exhaust groove in the molding die made of a low-viscosity material. A cross section of this main part is shown in FIG. 2
3 is an exhaust groove provided on the pin 2, 24 is an exhaust hole provided on the ejector pin 1, and 25 is an exhaust hole provided on the movable mold. The exhaust groove 23 of the pin 2 is connected to the inside of the cavity only during exhaust when the pin 2 is moving forward ([a]). Therefore, even low-viscosity materials could be molded without exhaust gas clogging. Similar results were also obtained when an exhaust hole was provided inside the pin 2.
また、ピンを進退させるための手段として油圧を成形機
の動作と同期させて使用しても良いことはもちろんであ
る。さらにピン先端の形状も今回説明した形状だけでは
なく、成形機のノズル開口部を確実にシールできれば他
の形状でも問題ない。Furthermore, it goes without saying that hydraulic pressure may be used as a means for moving the pins forward and backward in synchronization with the operation of the molding machine. Furthermore, the shape of the tip of the pin is not limited to the shape explained here, but other shapes may be used as long as the nozzle opening of the molding machine can be reliably sealed.
また、ピンの後退にしても射出圧力を用いるだけではな
く、油圧系を用いて積極的に行っても何ら問題はない。Moreover, there is no problem in retracting the pin not only by using injection pressure but also by actively using a hydraulic system.
本発明によれば、空気やガスを除去した型内面に成形材
料を充填・賦形することができ、ミクロンオーダーの高
精度な成形品を得ることができる。According to the present invention, it is possible to fill and shape the molding material into the inner surface of the mold from which air and gas have been removed, and it is possible to obtain a molded product with high precision on the micron order.
第１図は本発明の一実施例の金型の断面図、第２図は本
発明の一実施例の金型の要部断面図である。
１・・・エジュクタピン、２・・・ピン、３・・・バネ
。
２３・・・排気溝、２４・・排気孔、２５・・・排気孔
。FIG. 1 is a sectional view of a mold according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a mold according to an embodiment of the present invention. 1...Ejuctor pin, 2...Pin, 3...Spring. 23...Exhaust groove, 24...Exhaust hole, 25...Exhaust hole.
Claims (1)
において、エジュクタピン内部に進退可能なピンを設け
、型内を排気する時は、該ピンにより、ノズルタッチし
ている成形機のノズル開口部をシールし、射出時におい
ては、該ピンが後退し、充填流路を形成することを特徴
とする型内真空成形用金型。1. In an in-mold vacuum forming mold that has the function of evacuating the inside of the mold, a pin that can move forward and backward is installed inside the ejector pin, and when the inside of the mold is evacuated, the nozzle of the molding machine that is touching the nozzle is A mold for in-mold vacuum forming, characterized in that an opening is sealed, and during injection, the pin retreats to form a filling channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22462688A JPH0272917A (en) | 1988-09-09 | 1988-09-09 | In-mold vacuum mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22462688A JPH0272917A (en) | 1988-09-09 | 1988-09-09 | In-mold vacuum mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0272917A true JPH0272917A (en) | 1990-03-13 |
Family
ID=16816655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22462688A Pending JPH0272917A (en) | 1988-09-09 | 1988-09-09 | In-mold vacuum mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0272917A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5635221A (en) * | 1994-04-09 | 1997-06-03 | Lg Electronics Inc. | Injection molding apparatus for resin using gas injection |
-
1988
- 1988-09-09 JP JP22462688A patent/JPH0272917A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5635221A (en) * | 1994-04-09 | 1997-06-03 | Lg Electronics Inc. | Injection molding apparatus for resin using gas injection |
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