JPH049145Y2 - - Google Patents
Info
- Publication number
- JPH049145Y2 JPH049145Y2 JP1986201604U JP20160486U JPH049145Y2 JP H049145 Y2 JPH049145 Y2 JP H049145Y2 JP 1986201604 U JP1986201604 U JP 1986201604U JP 20160486 U JP20160486 U JP 20160486U JP H049145 Y2 JPH049145 Y2 JP H049145Y2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- thermal expansion
- main body
- metal
- branch runner
- 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
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は比較的大型の射出成形用金型内部の複
数箇所に溶融状態にある合成樹脂材料を同時に供
給するために用いられる射出成形用分岐湯道盤に
関するものである。[Detailed description of the invention] (Field of industrial application) This invention is an injection molding branch used to simultaneously supply molten synthetic resin material to multiple locations inside a relatively large injection mold. It is related to the hot water board.
（従来の技術）
上記のような分岐湯道盤は例えば自動車部品の
射出成形機等に広く用いられているが、多品種少
量生産を行う際には色替えが頻繁に行われるので
その内部に樹脂の滞留が生ずると色替え後の成形
品中に色替え前の色彩が混入するという重大な欠
点が発生する。このため本考案者等は分岐湯道盤
の内部における樹脂の滞留部を無くするために、
屈曲部を丸くした銅管又はステレンス管等を金属
材料中に鋳ぐるんだ分岐湯道盤を考案し、既に実
公昭54−1498号として提案した。ところがこの種
の分岐湯道盤は内部における樹脂の凝固を避ける
ために200〜250℃に加熱されるのが常であり、先
の考案においては鋳ぐるみのための金属材料とし
て熱伝導率の大きいベリリウム銅公金のような銅
合金を採用していたので、50〜60℃の金型本体と
の間の熱膨脹差は大きく、例えば長さが１ｍを越
えるような大型の金型において２mmを越える熱膨
脹差を生じていた。このため分岐湯道盤に取付け
られたノズルと金型側のスプルとの位置が食違
い、この部分にわずかながら樹脂の滞留が発生す
るため、いかに分岐湯道盤の内部における樹脂の
滞留を防止しても色むらの発生を完全に防止する
ことはできなかつた。そこで現状ではノズルの部
分に弾性を持たせてスプルとの位置ずれを防止す
る工夫も行われているが、繰返し使用すると疲労
により破壊してしまう欠点があつた。(Prior art) Branch runners as described above are widely used in, for example, injection molding machines for automobile parts. When resin stagnation occurs, a serious drawback arises in that the color before the color change is mixed into the molded product after the color change. Therefore, in order to eliminate the resin stagnation inside the branch runner, the inventors of the present invention
He devised a branch runner board in which copper pipes or stainless steel pipes with rounded bends were cast into a metal material, and had already proposed this as Publication of Utility Model Publication No. 1498-1983. However, this type of branch runner is usually heated to 200-250℃ to avoid solidification of the resin inside, and in the previous design, a metal material with high thermal conductivity was used for the casting. Since a copper alloy such as beryllium copper alloy was used, there is a large difference in thermal expansion between the mold body and the mold body at 50 to 60°C. For example, in a large mold with a length of over 1 m, thermal expansion of over 2 mm It was making a difference. For this reason, the position of the nozzle attached to the branch runner panel and the sprue on the mold side is misaligned, and a small amount of resin accumulates in this area, so how can you prevent resin stagnation inside the branch runner panel? However, it was not possible to completely prevent the occurrence of color unevenness. Currently, efforts are being made to make the nozzle elastic and prevent it from misaligning with the sprue, but this has the drawback that it can break due to fatigue if used repeatedly.
（考案が解決しようとする問題点）
本考案はこのような従来の問題点を解決して、
内部における樹脂の滞留を生じないことは勿論、
大型の金型に用いた場合にもノズルと金型のスプ
ルとの間に位置ずれによる樹脂の滞留を生ずるこ
とのない、多品種少量生産に適した射出成形用分
岐湯道盤を目的として完成されたものである。(Problems that the invention attempts to solve) This invention solves these conventional problems,
Of course, there is no accumulation of resin inside.
Completed for the purpose of a branch runner for injection molding that is suitable for high-mix, low-volume production without causing resin stagnation due to misalignment between the nozzle and the mold sprue even when used in large molds. It is what was done.
（問題点を解決するための手段）
本考案は、屈曲部に丸みを持たせた複数の金属
管を金属主体により鋳ぐるんだ射出成形用分岐湯
道盤において、上記金属主体を室温〜250℃の熱
膨脹係数が２〜６×10-6／℃の鉄系合金により形
成したことを特徴とするものである。(Means for Solving the Problems) The present invention provides a branch runner for injection molding in which a plurality of metal tubes with rounded bent portions are cast into a metal main body. It is characterized in that it is made of an iron-based alloy having a thermal expansion coefficient of 2 to 6×10 -6 /°C.
（実施例）
次に本考案を図示の実施例によつて更に詳細に
説明すると、１，２は鉄鋼製の金型であり、１は
複数個のスプル３を備えた固定型、２は可動型で
ある。本考案の分岐湯道盤は全体として４の番号
を付して示されたもので、その周囲に断熱用空気
層５を形成して固定枠６内にセツトされている。(Embodiment) Next, the present invention will be explained in more detail with reference to the illustrated embodiment. Reference numerals 1 and 2 are steel molds, 1 is a fixed mold equipped with a plurality of sprues 3, and 2 is a movable mold. It is a type. The branch runner of the present invention is designated by the number 4 as a whole, and is set in a fixed frame 6 with a heat insulating air layer 5 formed around it.
この分岐湯道盤４は図示のように屈曲部７に丸
みを持たせた複数の金属管８，８を鉄系合金製の
金属主体９の内部に鋳ぐるんだもので、金属管
８，８としては例えば極軟鋼あるいはステレンス
鋼管等が用いられる。本考案においてはこの金属
主体９として、室温〜250℃の熱膨脹係数が２〜
６×10-6／℃の鉄系合金が使用される。この鉄系
合金は金型１，２を構成する金属材料に比較して
熱膨脹係数が1/2以下である。金型１，２を構成
する一般的な金属材料は鉄鋼製であり、その熱膨
脹係数は11×10-6／℃程度であるため、金属主体
９に用いられる鉄系合金は６×10-6／℃以下、最
も好ましくは２〜４×10-6／℃程度の熱膨脹係数
を持つものである。このような鉄系合金として
は、例えばトータルカーボン2.6以下、Si1.0〜2.0
％、Mn1.0％以下、Ni34〜36％、Cr0.1％以下、
Mg0.02〜0.05％、残部Feからなるニレジスト鋳
鉄（ASTM−A436）を用いることができる。こ
のニレジスト鋳鉄は３〜６×10-6／℃の熱膨脹係
数を持ち、そのブリネル硬度は131〜185、引張強
度は約40Kg／mm2である。しかし金属主体９の組成
は必ずしもこれに限定されるものではなく、低い
熱膨脹係数を持つその他の材料、例えばアンバー
合金等を用いることも可能である。 As shown in the figure, this branch runner board 4 is made by casting a plurality of metal tubes 8, 8 with rounded bent portions 7 inside a metal main body 9 made of an iron-based alloy. As the material 8, for example, extremely mild steel or stainless steel pipe is used. In the present invention, the metal main body 9 has a coefficient of thermal expansion of 2 to 250°C from room temperature to 250°C.
An iron-based alloy with a temperature of 6×10 -6 /°C is used. This iron-based alloy has a coefficient of thermal expansion that is 1/2 or less of that of the metal material constituting the molds 1 and 2. The general metal material constituting the molds 1 and 2 is made of steel, and its coefficient of thermal expansion is approximately 11×10 -6 /℃, so the iron-based alloy used for the metal main body 9 is 6×10 -6 /°C or less, most preferably about 2 to 4×10 -6 /°C. Such iron-based alloys include, for example, total carbon of 2.6 or less, Si of 1.0 to 2.0
%, Mn1.0% or less, Ni34~36%, Cr0.1% or less,
Niresist cast iron (ASTM-A436) consisting of 0.02 to 0.05% Mg and the balance Fe can be used. This Niresist cast iron has a coefficient of thermal expansion of 3 to 6×10 -6 /°C, a Brinell hardness of 131 to 185, and a tensile strength of about 40 Kg/mm 2 . However, the composition of the metal main body 9 is not necessarily limited to this, and it is also possible to use other materials having a low coefficient of thermal expansion, such as an invar alloy.
なお、図示の実施例では金属管８，８の基部に
は注入口１０と分岐部１１とを持つブロツク１２
が溶接されている。このブロツク１２は例えばロ
ストワツクス法によつて鋳造され、金属管８，８
の基部を0.02mm以上の段差が生じないように溶接
したうえで金属主体９により鋳ぐるまれたもので
ある。しかしこのブロツク１２を省略し、注入口
１０の部分まで金属管８，８の基部を延長するこ
とも可能である。また図中１３は各金属管８，８
の先端に取付けられたノズルである。 In the illustrated embodiment, a block 12 having an inlet 10 and a branch part 11 is provided at the base of the metal tubes 8, 8.
is welded. This block 12 is cast by, for example, the lost wax method, and is made of metal tubes 8, 8.
The base is welded so as not to create a step of 0.02 mm or more, and then cast into the metal main body 9. However, it is also possible to omit this block 12 and extend the bases of the metal tubes 8, 8 to the injection port 10. In addition, 13 in the figure indicates each metal tube 8, 8.
It is a nozzle attached to the tip of the
（作用）
このように構成されたものは、金属主体９の内
部に多くのヒーターを挿入してその温度を200〜
250℃とすることにより内部の樹脂を溶融状態に
保ちつつ50〜60℃程度の金型１，２間のキヤビテ
イ内に複数のノズル１３，１３から樹脂を供給す
るものであることは従来のこの種のものと変わる
ところはない。しかし本考案においては分岐湯道
盤４の内部に屈曲部７に丸みを持たせた複数の金
属管８，８お埋設してあるので、注入口１０から
供給された樹脂は分岐部１１で分岐されたうえで
これらの金属管８，８の内部をスムーズに流れて
ノズル１３，１３まで達することとなり、内部に
おける樹脂の滞留が生ずるおそれはない。また本
考案においては分岐湯道盤４の金属主体９として
室温〜250℃の熱膨脹係数が２〜６×10-6／℃の
鉄系合金を使用しているので、使用中に分岐湯道
盤４全体が200〜250℃程度にまで加熱されてもノ
ズル１３と金型１のスプル３との間で位置ずれが
生ずることはない。即ち、例えば金属主体９とし
て熱膨脹係数が３×10-6／℃のニレジスト鋳鉄を
用いたとき、ノズル１３，１３間の長さを１ｍと
するとこの間の熱膨脹は約0.6mmとなるに対し、
金型１が鉄鋼製のものであればスプル３，３間の
熱膨脹は約0.55mmとなり、ほとんどずれを生ずる
ことがない。これに対して従来のような銅合金を
用いて分岐湯道盤４を製作した場合にはノズル１
３，１３間の熱膨脹は4.0mm程度となり、スプル
３，３との間に3.5mmという大きなずれが生ずる
のである。この結果、本考案の分岐湯道盤を用い
れば金型１，２との間に大きい温度差が存在する
にもかかわらずノズル１３と金型１のスプル３と
の間でずれが生ずることがないからこの部分に樹
脂が滞留することがなく、また内部における樹脂
の滞留もないので色替後の成形品中に色替前の色
が混入することが完全に防止される。なお金属主
体９の熱膨脹係数が６×10-6／℃を越えると、ノ
ズル１３とスプル３との間の位置ずれが次第に大
きくなり樹脂の滞留が生じ易くなる。また逆に金
属主体９の熱膨脹係数が２×10-6／℃未満のもの
は経済性の点から好ましくない。(Function) In the device configured in this way, many heaters are inserted inside the metal main body 9 to increase the temperature to 200~200℃.
The conventional method is to supply resin from multiple nozzles 13, 13 into the cavity between the molds 1 and 2 at a temperature of about 50 to 60°C while keeping the resin inside in a molten state by setting the temperature to 250°C. There is no difference from the seeds. However, in the present invention, a plurality of metal pipes 8, 8 with rounded bends 7 are buried inside the branch runner board 4, so the resin supplied from the injection port 10 is branched at the branch part 11. After that, the resin flows smoothly inside these metal tubes 8, 8 and reaches the nozzles 13, 13, and there is no possibility that the resin will stay inside. In addition, in the present invention, since the metal main body 9 of the branch runner 4 is made of an iron-based alloy with a coefficient of thermal expansion of 2 to 6 x 10 -6 /°C from room temperature to 250°C, the branch runner Even if the entire mold 4 is heated to about 200 to 250°C, no misalignment will occur between the nozzle 13 and the sprue 3 of the mold 1. That is, for example, when Niresist cast iron with a coefficient of thermal expansion of 3 x 10 -6 /°C is used as the metal main body 9, and the length between the nozzles 13 is 1 m, the thermal expansion between them is about 0.6 mm.
If the mold 1 is made of steel, the thermal expansion between the sprues 3 and 3 will be about 0.55 mm, and almost no deviation will occur. On the other hand, when the branch runner board 4 is manufactured using conventional copper alloy, the nozzle 1
The thermal expansion between sprues 3 and 13 is approximately 4.0 mm, resulting in a large deviation of 3.5 mm between sprues 3 and 3. As a result, if the branch runner of the present invention is used, there will be no misalignment between the nozzle 13 and the sprue 3 of the mold 1 even though there is a large temperature difference between the molds 1 and 2. Since there is no resin, there is no retention of resin in this part, and since there is no retention of resin inside, it is completely prevented that the color before the color change is mixed into the molded product after the color change. Note that when the thermal expansion coefficient of the metal main body 9 exceeds 6×10 −6 /° C., the misalignment between the nozzle 13 and the sprue 3 gradually increases, making it easy for resin to stagnate. On the other hand, it is not preferable from the economic point of view that the thermal expansion coefficient of the metal main body 9 is less than 2×10 -6 /°C.
（考案の効果）
本考案は以上の説明からも明らかなように、分
岐湯道盤の内部における樹脂の滞留を防止すると
ともに、熱膨脹に起因するノズルと金型間との接
続部分の樹脂の滞留をも防止することができるも
のであるから、多品種少量生産のために樹脂の色
替えを頻繁に行うような場合においても色替後の
成形品中に色替前の樹脂が混入して色むらを生じ
させるおそれがない。よつて本考案は大型の成形
品を複数箇所から溶融樹脂を供給しつつ射出成形
するに適したものであり、その実用的価値は極め
て大きいものである。(Effects of the invention) As is clear from the above description, the present invention prevents resin from stagnation inside the branch runner, and also prevents resin from stagnation at the connecting part between the nozzle and the mold due to thermal expansion. This prevents the resin from getting mixed in with the molded product after the color change, even if the color of the resin is changed frequently for high-mix, low-volume production. There is no risk of causing unevenness. Therefore, the present invention is suitable for injection molding large molded products while supplying molten resin from multiple locations, and its practical value is extremely large.
図面は本考案の実施例を示す断面図である。
１，２……金型、７……屈曲部、８……金属
管、９……金属主体。
The drawing is a sectional view showing an embodiment of the present invention. 1, 2... Mold, 7... Bent part, 8... Metal tube, 9... Metal main body.
Claims (1)
を金属主体９により鋳ぐるんだ射出成形用分岐湯
道盤において、上記金属主体９を室温〜250℃の
熱膨脹係数が２〜６×10-6／℃の鉄系合金により
形成したことを特徴とする射出成形用分岐湯道
盤。 A plurality of metal tubes 8, 8 whose bent portions 7 are rounded
A branch runner for injection molding in which a metal main body 9 is cast, characterized in that the metal main body 9 is formed of an iron-based alloy having a thermal expansion coefficient of 2 to 6×10 -6 /°C from room temperature to 250°C. Branch runner for injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986201604U JPH049145Y2 (en) | 1986-12-26 | 1986-12-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986201604U JPH049145Y2 (en) | 1986-12-26 | 1986-12-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63106620U JPS63106620U (en) | 1988-07-09 |
| JPH049145Y2 true JPH049145Y2 (en) | 1992-03-06 |
Family
ID=31165216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986201604U Expired JPH049145Y2 (en) | 1986-12-26 | 1986-12-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049145Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6886364B2 (en) * | 2017-08-16 | 2021-06-16 | 日立金属株式会社 | How to make an assembled model |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS541498Y2 (en) * | 1975-07-30 | 1979-01-23 |
-
1986
- 1986-12-26 JP JP1986201604U patent/JPH049145Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63106620U (en) | 1988-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2045841A1 (en) | Method of producing nickel shell molds | |
| DE2646060A1 (en) | Foundry moulds and dies - contg. elements which heat the empty die and them provide cooling for directional solidification of a casting | |
| JPH049145Y2 (en) | ||
| CN102909829B (en) | Full hot runner forming die for injector outer sheath | |
| JPH01226318A (en) | Sprue runner nozzle | |
| CN108176838A (en) | Improve the casting technique and casting mould of casting shrinkage cavity shrinkage porosity | |
| JPS63188468A (en) | Method for adjusting solidification in high temperature mold | |
| JPH0628248Y2 (en) | Heat insulation structure of molten resin in molten resin pressure molding equipment | |
| KR200268845Y1 (en) | aa | |
| CN221473443U (en) | Cracking-proof die head for investment casting tree assembly | |
| JPS55136554A (en) | Electric heating nozzle of hot chamber type die-casting machine | |
| JP3077038U (en) | Structure of die-casting mold equipped with buried bath | |
| DE3108828A1 (en) | Special process for injection moulding plastic parts with hollow shapes or curved shapes tapered towards one another and core for carrying out the process | |
| CN217021294U (en) | Semi-heating type hot runner system | |
| JPS63224839A (en) | Mold for casting steel kind roll for rolling mill | |
| KR200367193Y1 (en) | Ejaculation-sprue installing cool-jacket | |
| JPS5842107Y2 (en) | injection mold | |
| CN212664845U (en) | Sand core forming die | |
| JPS646272Y2 (en) | ||
| JPH032360Y2 (en) | ||
| JPH0428691Y2 (en) | ||
| JPH0677796B2 (en) | Method for forming water-cooled holes in conductive material for welding machine | |
| CN2445836Y (en) | Metal casting mold with hidden sprue | |
| JPH0242419Y2 (en) | ||
| JPH07227664A (en) | Die casting equipment |