JPH0547623Y2 - - Google Patents
Info
- Publication number
- JPH0547623Y2 JPH0547623Y2 JP1988018311U JP1831188U JPH0547623Y2 JP H0547623 Y2 JPH0547623 Y2 JP H0547623Y2 JP 1988018311 U JP1988018311 U JP 1988018311U JP 1831188 U JP1831188 U JP 1831188U JP H0547623 Y2 JPH0547623 Y2 JP H0547623Y2
- Authority
- JP
- Japan
- Prior art keywords
- runners
- tip
- ejector pin
- runner
- resin
- 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.)
- Expired - Lifetime
Links
- 238000000465 moulding Methods 0.000 claims description 20
- 239000011347 resin Substances 0.000 description 27
- 229920005989 resin Polymers 0.000 description 27
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
本考案は、射出成形用の成形金型に関するもの
である。
The present invention relates to a mold for injection molding.
射出成形機から成形金型Ａに射出された溶融し
た成形樹脂６は、第２図のようにスプルー７の先
端から各ランナー１，１……に分岐して流れ、各
ランナー１，１……の先部からキヤビテイに充填
される。そして成形樹脂６が固化したのちに、成
形金型ＡをパーテイングラインP.Lで開き、ラン
ナー１，１……の分岐箇所において成形金型Ａに
設けたエジエクタピン２によつて突き上げ、ラン
ナー１，１……内から成形樹脂６を脱型するよう
にしている。
The molten molding resin 6 injected from the injection molding machine into the molding die A branches and flows from the tip of the sprue 7 to each runner 1, 1... as shown in Fig. 2, and flows into each runner 1, 1... The cavity is filled from the tip. After the molding resin 6 has solidified, the mold A is opened at the parting line PL, and the ejector pin 2 provided on the mold A is pushed up at the branching point of the runners 1, 1. ...The molded resin 6 is removed from the inside.
しかしこのものにあつて、ランナー１，１……
の分岐箇所（第２図に示すａの箇所）は容積が大
きな部分となるためにこの箇所内の成形樹脂６は
固化の速度が遅くなる。従つて成形樹脂６がキヤ
ビテイ内やランナー１内で固化した後においても
ランナー１，１……の分岐箇所内の成形樹脂６は
固化されないことがあり、ランナー１，１……の
分岐箇所内の成形樹脂６が固化されないと成形金
型Ａを開いてエジエクタピン２で脱型することが
できないために、成形サイクルが長くなつて生産
性が悪くなるという問題があつた。そこでランナ
ー１，１……の直径を小さく形成してランナー
１，１……の分岐箇所の容積を小さくし、分岐箇
所内の成形樹脂６の固化速度を早めることが検討
されるが、ランナー１，１……を細くすると成形
樹脂６の流動性が著しく低下するためにこの方法
を採用することは現実的ではない。
本考案は上記の点に鑑みて為されたものであ
り、ランナー１，１……を細くしたりするような
必要なくランナー１，１……の分岐箇所内の成形
樹脂６の固化を早めて、成形サイクルを短くする
ことができる成形金型を提供することを目的とす
るものである。
However, in this case, runner 1, 1...
Since the branching point (point a in FIG. 2) has a large volume, the solidification rate of the molded resin 6 in this point is slow. Therefore, even after the molded resin 6 has solidified in the cavity or the runner 1, the molded resin 6 in the branch points of the runners 1, 1... may not be solidified, and the molded resin 6 in the branch points of the runners 1, 1... If the molding resin 6 is not solidified, it is impossible to open the mold A and remove the mold with the ejector pin 2, resulting in a problem that the molding cycle becomes longer and productivity deteriorates. Therefore, it has been considered to reduce the volume of the branching points of the runners 1, 1... by making the diameters of the runners 1, 1 smaller, thereby increasing the solidification speed of the molded resin 6 in the branching points. , 1... will significantly reduce the fluidity of the molded resin 6, so it is not practical to adopt this method. The present invention has been made in view of the above points, and it is possible to accelerate the solidification of the molded resin 6 in the branching points of the runners 1, 1... without the need to make the runners 1, 1... thinner. The object of the present invention is to provide a molding die that can shorten the molding cycle.
本考案に係る成形金型は、ランナー１，１……
の分岐箇所にエジエクタピン２の先端部を位置さ
せ、エジエクタピン２の先端面に突出して設けた
突片３をランナー１，１……の分岐箇所内に突入
させて成ることを特徴とするものである。
The molding die according to the present invention includes runners 1, 1...
The tip of the ejector pin 2 is positioned at the branch point of the ejector pin 2, and the protrusion 3 provided protruding from the tip surface of the ejector pin 2 is inserted into the branch point of the runners 1, 1... .
本考案にあつては、エジエクタピン２の先端の
突片３がランナー１，１……の分岐箇所内に突入
していることによつて、ランナー１，１の分岐箇
所内に突入する突片３の体積分だけこの分岐箇所
の容積が小さくなり、従つてこの箇所に充填され
る成形樹脂６の量も少なくなつて、ランナー１，
１……の分岐箇所内の成形樹脂６の固化を早める
ことができる。
In the present invention, since the protruding piece 3 at the tip of the ejector pin 2 protrudes into the branching part of the runners 1, 1..., the protruding piece 3 protruding into the branching part of the runners 1, 1. The volume of this branch point is reduced by the volume of , and the amount of molding resin 6 filled in this point is also reduced, and the runner 1,
It is possible to accelerate the solidification of the molded resin 6 within the branching locations of 1....
以下本考案を実施例によつて詳述する。スプル
ー７の先端において分岐されるランナー１，１…
…の分岐箇所に臨んで樹脂溜まり８が形成してあ
り、成形金型Ａに貫通させてスライド自在に設け
たエジエクタピン２の先端を樹脂溜まり８に臨ま
せてある。このエジエクタピン２の先端面にはエ
ジエクタピン２の直径よりも小さな直径で突片３
が設けてあり、第１図に示すようにこの突片３の
先部はランナー１，１……の分岐箇所内に突入さ
せてある。突片３は、成形金型Ａから離型したの
ちの成形樹脂６をエジエクタピン２の先端から引
出機で引き抜き易くするために、先端ほど径が小
さくなるテーパ形状に形成してあり、また先端面
を球面に形成してある。さらに、突片３は先端が
パーテイングラインP.Lよりも上に突出しないよ
うにしてある。
しかして、第１図は成形金型Ａを型閉めした状
態を示すものであり、射出成形機から成形金型Ａ
に射出された溶融した成形樹脂６は、スプルー７
の先端から各ランナー１，１……に分岐して流
れ、各ランナー１，１……の先部からキヤビテイ
に充填される。そして成形樹脂６が固化したのち
に、成形金型ＡをパーテイングラインP.Lで開
き、ランナー１，１……の分岐箇所において成形
金型Ａに設けたエジエクタピン２によつて突き上
げ、ランナー１，１……内から固化した成形樹脂
６を脱型するのである。ここで、ランナー１，１
の分岐箇所内にはエジエクタピン２に設けた突片
３が突入されているために、この突入する突片３
の体積分だけランナー１，１……の分岐箇所の容
積が小さくなり、この分岐箇所に充填される成形
樹脂６の量も少なくなる。従つて、ランナー１，
１……の径を細くするなどランナー１，１……の
形状を変更する必要なくランナー１，１……の分
岐箇所内の成形樹脂６の固化を早めることがで
き、成形サイクルを短縮することができるもので
ある。また、ランナー１，１……から固化した成
形樹脂６を突き出した状態においては、この固化
した成形樹脂６内に突片３が挿入されて食い込ん
だ状態で成形樹脂６はエジエクタピン２の先端に
保持されていることになり、脱型したあと取出機
で固化した成形樹脂６をエジエクタピン２の先端
から引き抜くまでの間にこの成形樹脂６がエジエ
クタピン２の先端から脱落するようなトラブルの
発生を防止することができる。
The present invention will be explained in detail below using examples. Runners 1, 1... branched off at the tip of the sprue 7.
A resin reservoir 8 is formed facing the branching point, and the tip of an ejector pin 2 which is slidably provided through the molding die A is made to face the resin reservoir 8. The tip surface of the ejector pin 2 has a protrusion 3 with a diameter smaller than the diameter of the ejector pin 2.
is provided, and as shown in FIG. 1, the tip of this protrusion 3 is inserted into the branch point of the runners 1, 1, . . . . The protruding piece 3 is formed into a tapered shape whose diameter becomes smaller toward the tip, in order to make it easier to pull out the molded resin 6 from the tip of the ejector pin 2 with a drawing machine after it has been released from the molding die A. is formed into a spherical surface. Further, the tip of the protruding piece 3 is designed not to protrude above the parting line PL. Figure 1 shows the state in which the mold A is closed, and the mold A is removed from the injection molding machine.
The molten molding resin 6 injected into the sprue 7
The liquid flows branching from the tip of the runners 1, 1..., and fills the cavity from the tip of each runner 1, 1.... After the molding resin 6 has solidified, the mold A is opened at the parting line PL, and the ejector pin 2 provided on the mold A is pushed up at the branching point of the runners 1, 1. ...The solidified molding resin 6 is removed from the mold. Here, runner 1, 1
Since the protruding piece 3 provided on the ejector pin 2 is inserted into the branch point, this protruding piece 3
The volume of the branching point of the runners 1, 1, . Therefore, runner 1,
It is possible to accelerate the solidification of the molding resin 6 within the branching points of the runners 1, 1... without changing the shape of the runners 1, 1... such as reducing the diameter of the runners 1, 1..., thereby shortening the molding cycle. It is something that can be done. Furthermore, when the solidified molded resin 6 is projected from the runners 1, 1..., the molded resin 6 is held at the tip of the ejector pin 2 with the protrusion 3 inserted and bit into the solidified molded resin 6. This prevents the occurrence of troubles such as the molded resin 6 falling off from the tip of the ejector pin 2 before the solidified molded resin 6 is pulled out from the tip of the ejector pin 2 after demolding. be able to.
上述のように本考案にあつては、ランナーの分
岐箇所にエジエクタピンの先端部を位置させ、エ
ジエクタピンの先端面に突出して設けた突片をラ
ンナーの分岐箇所内に突入させるようにしたの
で、ランナーの分岐箇所内に突入する突片の体積
分だけこの分岐箇所の容積が小さくなつて、この
分岐箇所に充填される成形樹脂の量も少なくな
り、ランナーを細くしたりするような必要なくラ
ンナー分岐箇所内の成形樹脂の固化を早めて、成
形サイクルを短縮することができるものである。
As mentioned above, in the present invention, the tip of the ejector pin is located at the branch point of the runner, and the protrusion provided on the tip surface of the ejector pin is made to protrude into the branch point of the runner. The volume of this branching point is reduced by the volume of the protrusion that protrudes into the branching point, and the amount of molding resin filled into this branching point is also reduced, making it unnecessary to make the runner thinner. It is possible to accelerate the solidification of the molding resin within the area and shorten the molding cycle.
第１図は本考案の一実施例の断面図、第２図は
従来例の断面図である。
１はランナー、２はエジエクタピン、３は突片
である。
FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1 is a runner, 2 is an ejector pin, and 3 is a protrusion.
Claims (1)
を位置させ、エジエクタピンの先端面に突出して
設けた突片をランナーの分岐箇所内に突入させて
成る成形金型。 A molding die in which the tip of an ejector pin is positioned at a branch point of the runner, and a protrusion protruding from the tip surface of the ejector pin is inserted into the branch point of the runner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988018311U JPH0547623Y2 (en) | 1988-02-15 | 1988-02-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988018311U JPH0547623Y2 (en) | 1988-02-15 | 1988-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01122914U JPH01122914U (en) | 1989-08-21 |
| JPH0547623Y2 true JPH0547623Y2 (en) | 1993-12-15 |
Family
ID=31232841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988018311U Expired - Lifetime JPH0547623Y2 (en) | 1988-02-15 | 1988-02-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0547623Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024176461A1 (en) * | 2023-02-24 | 2024-08-29 | 株式会社ジェイテクト | Injection molding machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858214A (en) * | 1981-10-02 | 1983-04-06 | Mitsubishi Motors Corp | Manufacture of compacted vermicular graphite cast iron |
| JPS6018527A (en) * | 1983-07-11 | 1985-01-30 | Otsuka Chem Co Ltd | Production of condensed polyalkoxyphosphazene compound |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5377974U (en) * | 1976-11-30 | 1978-06-29 |
-
1988
- 1988-02-15 JP JP1988018311U patent/JPH0547623Y2/ja not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5858214A (en) * | 1981-10-02 | 1983-04-06 | Mitsubishi Motors Corp | Manufacture of compacted vermicular graphite cast iron |
| JPS6018527A (en) * | 1983-07-11 | 1985-01-30 | Otsuka Chem Co Ltd | Production of condensed polyalkoxyphosphazene compound |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01122914U (en) | 1989-08-21 |
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