JPS5816839Y2 - Sprue structure of synthetic resin injection mold - Google Patents
Sprue structure of synthetic resin injection moldInfo
- Publication number
- JPS5816839Y2 JPS5816839Y2 JP1978071050U JP7105078U JPS5816839Y2 JP S5816839 Y2 JPS5816839 Y2 JP S5816839Y2 JP 1978071050 U JP1978071050 U JP 1978071050U JP 7105078 U JP7105078 U JP 7105078U JP S5816839 Y2 JPS5816839 Y2 JP S5816839Y2
- Authority
- JP
- Japan
- Prior art keywords
- sprue
- mold
- synthetic resin
- runner
- resin injection
- 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
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
本考案は合成樹脂の射出成型金型のスプルの改良に関す
るものである。[Detailed Description of the Invention] The present invention relates to an improvement in the sprue of a synthetic resin injection mold.
合成樹脂射出成形金型には、射出ノズルにスプルブツシ
ュが密接し、該ブツシュのスプルがランナを介してキャ
ビティに連通し、スプルが成形金型を介して冷却される
通常形式のものと、ホットランナ形式のもの等が存する
が、本考案は、前記通常形式の金型のスプルに関するも
のである。Synthetic resin injection molds include a conventional type in which a sprue bushing is in close contact with the injection nozzle, the sprue of the bushing communicates with the cavity through a runner, and the sprue is cooled through the mold, and a hot runner type. Although there are various types of sprues, the present invention relates to a sprue for the mold of the above-mentioned normal type.
そして、溶融樹脂の流れを阻害しない所要の断面積を保
持でき、しかも冷却は迅速に行ないうるスプルを提供す
ることを目的としている。Another object of the present invention is to provide a sprue that can maintain a required cross-sectional area without inhibiting the flow of molten resin and can be cooled quickly.
合成樹脂射出成形金型に接するスプルブツシュのスプル
は、従来は第８図中符号１０１で示すように、単一のテ
ーパ孔であって、溶融樹脂の流れに対し抵抗を与えない
寸法とすると、高温の射出ノズル１０２からの伝熱のた
めスプルブツシュ１０３が高温となっているため、成形
品１０４の冷却、固化が完了し、金型１０５，１０６が
型開きされる時点になっても、スプルと射出ノズル１０
２との合せ部１０７の樹脂が未だ溶融状態Ｑま・とされ
、型開きと共に糸引き部１０８が形成されてしまい、こ
の糸引き部１０８が、第８図中鎖線１０９で示すように
金型に付着し、次回の成型時に不良品が成形される原因
となっている。Conventionally, the sprue of the sprue bush in contact with the synthetic resin injection mold was a single tapered hole, as shown by reference numeral 101 in FIG. Because the sprue bush 103 is at a high temperature due to heat transfer from the injection nozzle 102, the sprue and injection Nozzle 10
The resin at the mating part 107 with 2 is still in a molten state, and a threaded part 108 is formed when the mold is opened. This causes defects to be molded during the next molding process.
また上述の如き欠点を除去するため、スプル径を小とし
て冷却を促進することも提案されているが、スプルと射
出ノズルとの合せ部から樹脂洩れを生じたり、溶融樹脂
の流れが不円滑となったり、あるいは成形品にゲートフ
ラッシュを生じたりする欠点を伴なっている。In addition, in order to eliminate the above-mentioned drawbacks, it has been proposed to reduce the diameter of the sprue to facilitate cooling, but this may cause resin to leak from the joint between the sprue and the injection nozzle, or the flow of molten resin to be uneven. This is accompanied by drawbacks such as the formation of gate flash in the molded product.
本考案は、実用新案登録請求の範囲に記載する構成とす
ることにより、上述の如き諸欠点のないスプルを得たも
のである。The present invention provides a sprue that does not have the above-mentioned drawbacks by adopting the configuration described in the claims of the utility model registration.
以下図示例について、本考案の構成を説明する。The configuration of the present invention will be described below with reference to illustrated examples.
第１図ないし第３図において、スプルブツシュ１には、
スプル２が穿設され、上金型３．下金型４のランナ５、
キャビティ６に連通され、スプル２の開口部７は、射出
成形機の射出ノズル８の開口部９に密着しうるように構
成されている。In Figures 1 to 3, the sprue bush 1 has the following:
The sprue 2 is drilled, and the upper mold 3. runner 5 of the lower mold 4,
The sprue 2 is communicated with the cavity 6, and the opening 7 of the sprue 2 is configured to fit tightly into the opening 9 of the injection nozzle 8 of the injection molding machine.
本考案においては、スプル２の始端部１０における前記
開口部７を、第２図、第３図に示されるように、射出ノ
ズル８の開口部９の面積ａ内に開口する２個の開口部１
１．１２とし、両者をスプルブツシュ１の内部１３で互
に隔離させると共に、開口部１１．１２に続き、所定の
スプルテーパで拡開し、互に隔離されているテーパ孔１
４，１５を設け、更にこのテーパ孔１４．１５に続くス
プル部分１６即ちテーパ７Ｌ１４，１５の終端部分から
ランナ５との連通孔１７に至る区間を、前記テーパ孔１
４，１５が互に連通し、合体して所定のスプルテーパで
拡開する一つのスプル主体部１８としたものである。In the present invention, the opening 7 at the starting end 10 of the sprue 2 is formed into two openings that open within the area a of the opening 9 of the injection nozzle 8, as shown in FIGS. 2 and 3. 1
1.12, the two are separated from each other in the interior 13 of the sprue bush 1, and a tapered hole 1 that continues to the opening 11.12 widens at a predetermined sprue taper and is isolated from each other.
4 and 15 are provided, and the sprue portion 16 following the taper hole 14.15, that is, the section from the end portion of the taper 7L14, 15 to the communication hole 17 with the runner 5 is connected to the taper hole 1.
4 and 15 communicate with each other and combine to form one sprue main body 18 that expands with a predetermined sprue taper.
第４図、第５図は、前述の構成のスプル２をテーパドリ
ルを用いて削設した実施例であって、スプル２の始端部
分１０における開口部１９．２０は第５図Ａに示される
ように離間し、テーパ孔２１．２２も互に離間されてい
るが、テーパ孔２１，２の終端部分では、第５図Ｂに示
されるように両孔は、スプルブツシュ２３の薄肉部２４
を介して隣接し、遂には第５図Ｃに示されるように互に
連通し合体して所定のスプルテーパで拡開するスプル主
体部２５を形成している。4 and 5 show an embodiment in which the sprue 2 having the above-mentioned configuration is cut using a taper drill, and the openings 19 and 20 at the starting end portion 10 of the sprue 2 are formed as shown in FIG. 5A. The tapered holes 21 and 22 are also spaced apart from each other, but at the end portions of the tapered holes 21 and 2, as shown in FIG.
As shown in FIG. 5C, the sprue body portions 25 are adjacent to each other through the sprue taper, and are connected to each other to form a sprue main body portion 25 that is expanded at a predetermined sprue taper.
この実施例では、ランナとの連通孔２６においても、ス
プル断面は第５図りに示されるようにまゆ型をなしてい
る。In this embodiment, also in the communication hole 26 with the runner, the cross section of the sprue has a cocoon shape as shown in the fifth diagram.
第６図、第７図は、スプル２を、スプル形状と合致する
外形の放電加工用電極を用いて放電加工により穿設した
ものであって、開口部２７，２８、スプルＪＬ２９，３
０、該孔の終端部分における構造は、第７図Ａ、Ｂに示
される如く、第４図、第５図に示すものと同様であるが
、スプル主体部３１においては、第７図Ｃに示される楕
円状から、第７図りに示される真円状に徐々に変化し、
ランナとの連通孔３２では真円となるように構成された
ものである。6 and 7 show the sprue 2 drilled by electrical discharge machining using an electrode for electrical discharge machining having an outer shape that matches the shape of the sprue.
0. The structure at the end of the hole, as shown in FIGS. 7A and 7B, is the same as that shown in FIGS. It gradually changes from the elliptical shape shown to the perfect circular shape shown in the seventh diagram,
The communication hole 32 with the runner is configured to be a perfect circle.
本考案は、上述の構成よりなるものであり、射出成形機
の射出ノズルに密接するスプル始端部が少なくとも２個
の互に隔離された開口部とテーパ孔とで形成され、両者
の間にはスプルブツシュの内部が介在するので、成形金
型に接しており、冷却されるスプルブツシュの冷却効果
が、前記開口部とテーパ孔とに十分に作用し、キャビテ
ィ部分の冷却完了とスプル始端部の冷却完了とを同時た
らしめうる効果を奏しうるし、開口部とテーパ孔とが分
割されることによってそれぞれ著しく小径のものとなっ
ても、合計断面積では、溶融樹脂の必要流量は確保しう
るので、それぞれの形状を流路抵抗の少ない理想的な形
状に設計でき、樹脂洩れ、樹脂の流れの不円滑、ゲート
フラッシュの発生、糸引き等の諸欠点を完全に除去でき
る効果をも有している。The present invention has the above-mentioned configuration, in which the sprue starting end that is in close contact with the injection nozzle of the injection molding machine is formed with at least two mutually isolated openings and a tapered hole, and there is a space between them. Since the interior of the sprue bushing is interposed, it is in contact with the molding die, and the cooling effect of the sprue bushing being cooled sufficiently acts on the opening and the tapered hole, completing cooling of the cavity portion and cooling of the sprue starting end. Even if the opening and the tapered hole are divided and each has a significantly smaller diameter, the total cross-sectional area can still ensure the required flow rate of the molten resin. can be designed to have an ideal shape with low flow path resistance, and has the effect of completely eliminating various defects such as resin leakage, non-smooth resin flow, occurrence of gate flash, and stringiness.
第１図は、本考案の実施の１例を適用した射出成形装置
の要部縦断面図、第２図は第１図に示すもののスプル始
端部の拡大縦断面図、第３図は第２図に示すスプルの平
面図、第４図はドリル加工で形成されたスプルの１例の
縦断面図、第５図Ａ。
Ｂ、ＣおよびＤは、それぞれ第４図中Ａ−Ａ線、Ｂ−Ｂ
線、ｃ−ｃ線およびＤ−Ｄ線断面図、第６図は放電加工
で形成されたスプルの１例の縦断面図、第７図Ａ、Ｂ、
ＣおよびＤは、それぞれ第６図中ＡＡ線、Ｂ−Ｂ線、Ｃ
−Ｃ線およびＤ−Ｄ線断面図、第８図は従来の射出成形
機を型開き状態で示した縦断面図である。
１・・・・・・スプルブツシュ、２・・・・・・スプル
、３・・・・・・成形金型の上金型、４・・・・・・成
形金型の下金型、５・・・・・・ランナ、８・・・・・
・射出ノズル、９・・・・・・射出ノズルの開口部、１
０・・・・・・スプル始端部、１１．１２・・・・・・
スプルの開口部、１４．１５・・・・・・テーパ孔、１
７・・・・・・ランナとの連通孔、１８・・・・・・ス
プル主体部。FIG. 1 is a vertical cross-sectional view of the main parts of an injection molding apparatus to which an embodiment of the present invention is applied, FIG. 2 is an enlarged vertical cross-sectional view of the starting end of the sprue shown in FIG. 1, and FIG. FIG. 4 is a plan view of the sprue shown in the figure, and FIG. 5A is a vertical sectional view of an example of a sprue formed by drilling. B, C and D are lines A-A and B-B in Fig. 4, respectively.
6 is a vertical sectional view of an example of a sprue formed by electric discharge machining, and FIGS. 7A, B,
C and D are line AA, line B-B, and C in Fig. 6, respectively.
-C line and D-D line sectional views, and FIG. 8 is a longitudinal sectional view showing a conventional injection molding machine in an open state. 1... Sprue bush, 2... Sprue, 3... Upper mold of the molding mold, 4... Lower mold of the molding mold, 5. ...Runner, 8...
・Injection nozzle, 9...Injection nozzle opening, 1
0...Sprue start end, 11.12...
Sprue opening, 14.15...Tapered hole, 1
7...Communication hole with runner, 18...Spru main body.
Claims (1)
プルがランナを介してキャビティに連通し、スプルが成
形金型を介して冷却される通常形式の合成樹脂射出成形
金型において、成形金型に接するスプルブツシュのスプ
ルの始端部が、単一の射出ノズル開口部内に開口する少
なくとも２個の、互に隔離された開口部と、所定のスプ
ルテーパで拡開するテーパ孔とよりなり、該テーパ孔の
終端からランナとの連通孔に至る区間は、前記テーパ孔
が互に連通合体して所定のスプルテーパで拡開する一つ
のスプル主体部を形式しており、このスプル主体部がキ
ャビティに隣接するランナに連続していることを特徴と
する合成樹脂射出成形金型のスプル構造。In a conventional synthetic resin injection mold in which a sprue bush is in close contact with the injection nozzle, the sprue of the bush communicates with the cavity via a runner, and the sprue is cooled through the mold, the sprue bush is in contact with the mold. The starting end of the sprue has at least two spaced apart openings opening into a single injection nozzle opening, and a tapered hole that widens with a predetermined sprue taper; In the section leading to the communication hole with the runner, the tapered holes communicate with each other to form one sprue main body that expands at a predetermined sprue taper, and this sprue main body is continuous with the runner adjacent to the cavity. The sprue structure of a synthetic resin injection mold is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978071050U JPS5816839Y2 (en) | 1978-05-25 | 1978-05-25 | Sprue structure of synthetic resin injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978071050U JPS5816839Y2 (en) | 1978-05-25 | 1978-05-25 | Sprue structure of synthetic resin injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54173064U JPS54173064U (en) | 1979-12-06 |
| JPS5816839Y2 true JPS5816839Y2 (en) | 1983-04-05 |
Family
ID=28981431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1978071050U Expired JPS5816839Y2 (en) | 1978-05-25 | 1978-05-25 | Sprue structure of synthetic resin injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5816839Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4974744A (en) * | 1972-11-16 | 1974-07-18 |
-
1978
- 1978-05-25 JP JP1978071050U patent/JPS5816839Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4974744A (en) * | 1972-11-16 | 1974-07-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54173064U (en) | 1979-12-06 |
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