JPH0157648B2 - - Google Patents
Info
- Publication number
- JPH0157648B2 JPH0157648B2 JP11983284A JP11983284A JPH0157648B2 JP H0157648 B2 JPH0157648 B2 JP H0157648B2 JP 11983284 A JP11983284 A JP 11983284A JP 11983284 A JP11983284 A JP 11983284A JP H0157648 B2 JPH0157648 B2 JP H0157648B2
- Authority
- JP
- Japan
- Prior art keywords
- gate
- injection molding
- runner
- resin
- mold
- 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
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000001746 injection moulding Methods 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 12
- 150000002739 metals Chemical class 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims 1
- 239000011347 resin Substances 0.000 description 19
- 229920005989 resin Polymers 0.000 description 19
- 238000001816 cooling Methods 0.000 description 10
- 230000005679 Peltier effect Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
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)
Description
【発明の詳細な説明】
〔技術分野〕
この発明は、ランナーレス射出成形方法および
この方法に用いることができるランナーチツプ体
に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a runnerless injection molding method and a runner chip body that can be used in this method.
従来、本発明者が開発した特公昭48−5093号公
報、特公昭51−38936号公報などの発明が広く知
られかつ本発明者が関係する会社によつて世界的
規模の下に実施されている。この従来技術の基本
的構成は第3図に示すように成形型1,1のゲー
ト2近傍すなわちゲートランド3に発熱体4が臨
まれ、この発熱体4を射出成形操作の都度発熱さ
せてゲート2近傍の成形用樹脂を局部的に加熱し
て溶融させゲート2を開いて射出成形操作を可能
とし、この成形操作の後は、発熱体4の発熱を停
止させてゲート2近傍の成形用樹脂を局部的に冷
却固化させてゲート2を閉じて一連の射出成形操
作を完了するようになつている。
In the past, the inventions developed by the present inventor, such as those disclosed in Japanese Patent Publication No. 48-5093 and Japanese Patent Publication No. 51-38936, have been widely known and have been implemented on a global scale by companies related to the present inventor. There is. As shown in FIG. 3, the basic configuration of this prior art is that a heating element 4 is placed near the gate 2 of the molds 1, 1, that is, on the gate land 3, and the heating element 4 is made to generate heat each time an injection molding operation is performed. The molding resin near the gate 2 is locally heated and melted to open the gate 2 to enable the injection molding operation.After this molding operation, the heat generation of the heating element 4 is stopped and the molding resin near the gate 2 is melted. is locally cooled and solidified, and the gate 2 is closed to complete a series of injection molding operations.
すなわち、極めて狭小なゲート2近傍の部分的
な樹脂を、きわめて小さなな発熱体4によつて局
部的に加熱処理させて、瞬時に溶融、冷却固化さ
せるようにしたもので、ゲート部分の溶融による
成形性の不良、品質の低下を防ぎ、スプルーラン
ナーを有する精密成形加工と同等の精密成形を可
能とした点にきわめて有効である。 In other words, the resin in the vicinity of the extremely narrow gate 2 is locally heated using an extremely small heating element 4 to instantaneously melt, cool, and solidify the resin. It is extremely effective in preventing poor moldability and deterioration in quality and enabling precision molding equivalent to precision molding with a sprue runner.
このような従来技術に対し、本発明者はさらに
ゲート2近傍の樹脂を前述の発熱体4に代えてゲ
ート2の周辺を局部的に加熱する他の加熱手段
(図示せず)を型内に設けて電気的に加熱熱させ
たり、あるいは強制冷却するための冷却手段を、
ゲート2の周辺または発熱体4を先端に設けた砲
弾型のランナーチツプ体5内に、細管などにより
形成し、空気その他の冷媒を供給して発熱体4の
発熱停止と同時に溶融樹脂の強制的な冷却作用を
行わせてゲート2の閉塞を有効に行わせたりして
改良を加えていた。 In contrast to such conventional technology, the present inventor further replaced the resin near the gate 2 with the above-mentioned heating element 4 and installed another heating means (not shown) in the mold to locally heat the area around the gate 2. A cooling means for electrically heating or forced cooling is provided.
A thin tube is formed around the gate 2 or inside a bullet-shaped runner chip 5 with a heating element 4 at the tip, and air or other refrigerant is supplied to the runner chip 5 to forcibly displace the molten resin at the same time as the heating element 4 stops generating heat. Improvements were made by providing a cooling effect to effectively close gate 2.
このような従来の発熱体4などの加熱手段を用
いたランナーレス射出成形方法は、加熱手段が積
極的な制御によつて、きわめて有効に作動させる
ことができ、ゲート2近傍の固化樹脂を加熱溶融
してゲート2を開くことを能率的に行わせること
ができる反面、冷却手段は、発熱体4などの加熱
手段の放熱かあるいは別個に附設した強制冷却機
構による冷却かによつて行わせる必要があり、前
者の放熱では溶融樹脂の冷却固化を強制的に行え
ないという問題があり、後者の強制冷却では構成
が複雑となるという問題点があつた。 In the runnerless injection molding method using a heating means such as the conventional heating element 4, the heating means can be operated extremely effectively by active control, and the solidified resin near the gate 2 can be heated. While it is possible to efficiently melt the gate 2 and open the gate 2, it is necessary to use a cooling means such as heat dissipation from a heating means such as a heating element 4 or a separately provided forced cooling mechanism. The former method of heat dissipation has the problem that the molten resin cannot be forcibly cooled and solidified, while the latter method of forced cooling has the problem of complicating the structure.
この発明は叙上の点に着目して成されたもの
で、極めて狭少なゲート近傍に配設されて邪魔に
ならず、簡単な構成の下に、加熱と冷却とを強制
的に行えるようにした新規なランナーレス射出成
形方法およびランナーチツプ体を得ることにあ
る。
This invention was made by focusing on the above points, and it is arranged in the vicinity of an extremely narrow gate and does not get in the way, and has a simple structure that allows forcible heating and cooling. The object of the present invention is to obtain a new runnerless injection molding method and a runner chip body.
すなわち、この発明は成形型のキヤビテイに通
ずるゲート近傍に、異種金属の接合部を配設し、
異種金属に対する電流の流れの方向を変化させて
接合部においてペルチエ効果に基づく加熱と吸熱
との強制制御を行わせ、これによりゲート近傍の
滞溜樹脂を溶融、固化させてゲートの開閉をきわ
めて歯切れ良く行わせて精密成形、高品質成形を
能率的に行えるようにしたランナーレス射出成形
方法およびランナーチツプ体を得ることにある。 That is, this invention arranges a joint of dissimilar metals near the gate leading to the cavity of the mold,
By changing the direction of current flow through dissimilar metals, forced control of heating and heat absorption based on the Peltier effect is performed at the joint, which melts and solidifies the accumulated resin near the gate, making it possible to open and close the gate with extreme precision. To obtain a runnerless injection molding method and a runner chip body which can efficiently carry out precision molding and high quality molding.
また、この発明は、ペルチエ効果を呈する異種
金属の接合部をゲート近傍において、ゲートラン
ド部に臨ませるかあるいはゲートを形成する金型
内のゲートの外周位置に充填させるか、好みの構
成で配設してゲート近傍の樹脂の加熱溶融、冷却
固化を交互に行わせて成形操作を行うようにした
ランナーレス射出成形方法を得ることにある。 In addition, the present invention allows the dissimilar metal junction exhibiting the Peltier effect to be placed in the vicinity of the gate, facing the gate land portion, or filled in the outer periphery of the gate in the mold forming the gate, or in any desired configuration. An object of the present invention is to provide a runnerless injection molding method in which a molding operation is performed by alternately heating and melting the resin near the gate and cooling and solidifying it.
以下に、この発明の実施例を図面と共に説明す
る。
Examples of the present invention will be described below with reference to the drawings.
なお、従来例と同一または相当する個処には同
一符号を附し説明の詳細は省く。 Note that the same reference numerals are given to the same or corresponding parts as in the conventional example, and detailed description thereof will be omitted.
6は、ランナーチツプ体5の円錐状尖鋭端に設
けられる二種の金属7,8の接合部で、例えば、
ビスマス、テルルなどの異種金属、アンチモン、
ビスマスなどの異なる金属同士の接合ポイントで
ある。 Reference numeral 6 denotes a joint between two types of metals 7 and 8 provided at the conical sharp end of the runner chip body 5, for example,
Dissimilar metals such as bismuth and tellurium, antimony,
It is a joining point between different metals such as bismuth.
したがつて、金属7と金属8との間に電流を流
がすと、その方向によつて熱の発生または吸収を
生ずるペルチエ効果が発生し、ゲート2の近傍の
存在した樹脂を加熱または冷却してゲート2を開
閉でき、一連の射出成形操作を行わせることがで
きる。 Therefore, when a current is passed between metal 7 and metal 8, a Peltier effect occurs that generates or absorbs heat depending on the direction of the current, heating or cooling the resin near the gate 2. The gate 2 can be opened and closed to allow a series of injection molding operations to be performed.
9は、前記金属7,8への電流の流れの方向を
切替えることができるスイツチなどの切替機構、
10は該切替機構9を制御するタイマー、11は
マニホールド、12は射出成形機の加熱筒、13
はそのノズルをそれぞれ示し、さらに第3図と共
通して14はランナー部、15はキヤビテイを示
す。 9 is a switching mechanism such as a switch capable of switching the direction of current flow to the metals 7 and 8;
10 is a timer that controls the switching mechanism 9; 11 is a manifold; 12 is a heating cylinder of the injection molding machine; 13
1 and 2 respectively indicate the nozzles, and, in common with FIG. 3, numeral 14 indicates a runner portion and numeral 15 indicates a cavity.
ところで、ランナーチツプ体5にはランナー部
14の樹脂を常時溶融状態に保持するための保温
用の補助ヒータを内蔵しても良い。 Incidentally, the runner chip body 5 may have a built-in auxiliary heater for keeping the resin of the runner portion 14 in a molten state at all times.
叙上の構成に基づいて、この発明の作用を説明
する。 The operation of this invention will be explained based on the above configuration.
まず公知の手段により、射出成形に必要なすべ
ての条件が備わつたものとする。 First, all conditions necessary for injection molding are provided by known means.
射出成形操作の前にタイマー10が働き、切替
機構9を経て、一方の金属7から他方の金属8へ
電気が流れると、接合部6はペルチエ効果により
発熱(または吸熱)する。 Before the injection molding operation, the timer 10 is activated, and when electricity flows from one metal 7 to the other metal 8 via the switching mechanism 9, the joint 6 generates heat (or absorbs heat) due to the Peltier effect.
切替機構9の切替操作で電流の流れの方向が反
転すると接合部6は吸熱(または発熱)する。 When the direction of current flow is reversed by the switching operation of the switching mechanism 9, the joint 6 absorbs heat (or generates heat).
したがつて、接合部6が臨まれるゲート近傍の
成形用樹脂は、ペルチエ効果により接合部6が発
熱する時は溶融してゲート2は開かれ射出成形機
の射出操作により予じめ溶融されているランナー
部14、マニホールド11内の樹脂はゲート2を
通つてキヤビテイ15内に注入され射出操作を完
了する。 Therefore, the molding resin near the gate where the joint 6 faces is melted when the joint 6 generates heat due to the Peltier effect, the gate 2 is opened, and the resin is melted in advance by the injection operation of the injection molding machine. The resin in the runner section 14 and manifold 11 is injected into the cavity 15 through the gate 2 to complete the injection operation.
切替機構9の働きで金属7,8に対する電流の
流れの方向を反転させれば、接合部6はペルチエ
効果により吸熱冷却してゲート2近傍の溶融樹脂
を冷却して固化させるのでゲート2は閉じ型開操
作の後、キヤビテイ15内の成形品を取り出すこ
とができる。 When the switching mechanism 9 reverses the direction of current flow to the metals 7 and 8, the joint 6 is endothermically cooled by the Peltier effect and the molten resin near the gate 2 is cooled and solidified, so the gate 2 is closed. After the mold opening operation, the molded product inside the cavity 15 can be taken out.
この一連の成形操作を連続して行うことにより
高精度、高能率なランナーレス射出成形品を得る
ことができる。 By continuously performing this series of molding operations, a highly accurate and highly efficient runnerless injection molded product can be obtained.
以上、この発明について一実施例を記述した
が、二種の異なる金属7,8の接合部6は、ゲー
ト2近傍であれば本実施例のように溶融樹脂の流
通路内は勿論のことゲート2を形成する型内に設
けても良い(図示せず)。 Although one embodiment of this invention has been described above, the joint 6 of two different metals 7 and 8 can be placed in the vicinity of the gate 2 as well as in the flow path of the molten resin as in this embodiment. 2 (not shown).
この発明によれば、ゲート部近傍の滞溜する樹
脂を強制的に加熱して溶融するのみならず、冷却
操作も亦強制的に行わせているので、ゲートの開
閉操作が所謂歯切れ良く作動し、成形品の加工精
度は著るしく向上すると共に成形サイクルを時間
短縮できて、高能率な製造が期待できる。さらに
スプルーランナーができないので樹脂原料の無駄
を省くこともできるなど幾多の効果を有するもの
である。
According to this invention, not only is the resin accumulated in the vicinity of the gate portion forcibly heated and melted, but also the cooling operation is also forcibly performed, so that the opening and closing operations of the gate can be performed with a crisp operation. , the processing accuracy of molded products can be significantly improved, the molding cycle can be shortened, and highly efficient manufacturing can be expected. Furthermore, since there is no sprue runner, it is possible to eliminate waste of resin raw materials, and has many other effects.
第1図はこの発明に係るランナーレス射出成形
方法の一実施例を示す要部構成の一部切欠断面
図、第2図は同上要部の拡大説明図、第3図は従
来の製造法を示す概略説明図である。
1,1……成形型、2……ゲート、4……発熱
体、5……ランナーチツプ体、6……異種金属
7,8の接合部。
Fig. 1 is a partially cutaway sectional view of the main parts of an embodiment of the runnerless injection molding method according to the present invention, Fig. 2 is an enlarged explanatory view of the same main parts, and Fig. 3 shows the conventional manufacturing method. FIG. DESCRIPTION OF SYMBOLS 1, 1...Mold, 2...Gate, 4...Heating element, 5...Runner chip body, 6...Joint part of dissimilar metals 7 and 8.
Claims (1)
塑性樹脂を、射出成形操作の都度、ペリチエ効果
に基づく加熱作用と吸熱作用とにより溶融・固化
を交互に行わせてゲートを開閉することを特徴と
するランナーレス射出成形方法。 2 スプルー部に縦装されるランナー本体の先端
に異種金属の接合部を設け、この接合部を成形型
のゲート近傍に臨ませるようにしたことを特徴と
するランナーチツプ体。[Scope of Claims] 1. The thermoplastic resin for molding existing near the gate of the mold is melted and solidified alternately by heating action based on the Pelletier effect and endothermic action each time an injection molding operation is performed to form the gate. A runnerless injection molding method characterized by opening and closing. 2. A runner chip body characterized in that a joint part of different metals is provided at the tip of a runner body vertically mounted on a sprue part, and this joint part is made to face near the gate of a mold.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11983284A JPS60264216A (en) | 1984-06-13 | 1984-06-13 | Runnerless injection molding method and runner tip body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11983284A JPS60264216A (en) | 1984-06-13 | 1984-06-13 | Runnerless injection molding method and runner tip body |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60264216A JPS60264216A (en) | 1985-12-27 |
JPH0157648B2 true JPH0157648B2 (en) | 1989-12-06 |
Family
ID=14771362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11983284A Granted JPS60264216A (en) | 1984-06-13 | 1984-06-13 | Runnerless injection molding method and runner tip body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60264216A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100536771B1 (en) * | 2002-08-16 | 2005-12-14 | 유도실업주식회사 | Device and method for opening and closing noggle gate with heating and cooling device for hot runners of injection molding machines |
US7914271B2 (en) * | 2007-11-29 | 2011-03-29 | Husky Injection Molding Systems Ltd. | Gate insert heating and cooling |
-
1984
- 1984-06-13 JP JP11983284A patent/JPS60264216A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS60264216A (en) | 1985-12-27 |
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