JPH0712629B2 - Injection mold - Google Patents
Injection moldInfo
- Publication number
- JPH0712629B2 JPH0712629B2 JP41395890A JP41395890A JPH0712629B2 JP H0712629 B2 JPH0712629 B2 JP H0712629B2 JP 41395890 A JP41395890 A JP 41395890A JP 41395890 A JP41395890 A JP 41395890A JP H0712629 B2 JPH0712629 B2 JP H0712629B2
- Authority
- JP
- Japan
- Prior art keywords
- hot runner
- nozzle
- mold
- cavity
- memory alloy
- 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 - Fee Related
Links
- 238000002347 injection Methods 0.000 title claims description 6
- 239000007924 injection Substances 0.000 title claims description 6
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 10
- 238000001746 injection moulding Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 description 7
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000005489 elastic deformation Effects 0.000 description 4
- 229910010380 TiNi Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000463 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
-
- 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
- B29C45/2701—Details not specific to hot or cold runner channels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、複数のキャビティと
ホットランナノズルを備えた射出成形用金型に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die having a plurality of cavities and a hot runner nozzle.
【０００２】[0002]
【従来の技術】複数のキャビティを備えた射出成形用金
型では、金型中央から各キャビティに溶融樹脂を導くホ
ットランナを穿設したブロックを内装しており、その各
ホットランナの端部にノズルを設けて各キャビティのゲ
ートに当接している。2. Description of the Related Art An injection molding die having a plurality of cavities is internally provided with a block having a hot runner for guiding molten resin from the center of the die to each cavity, and an end portion of each hot runner is provided. A nozzle is provided and is in contact with the gate of each cavity.
【０００３】[0003]
【発明が解決しようとする課題】このホットランナノズ
ルの当接は、特殊な場合を除いて、ホットランナブロッ
クの背面と金型取付板との間に板体を挿入して行ってい
るため、ノズルの当接力に問題が生じ易く、当接力が弱
いと樹脂漏れが生ずる。The contact of the hot runner nozzle is carried out by inserting a plate between the back surface of the hot runner block and the mold mounting plate except for a special case. A problem is likely to occur in the contact force of the nozzle, and if the contact force is weak, resin leakage will occur.
【０００４】また複数のノズルの間には、当然ながら僅
かではあるが、ホットランナブロックからの突出寸法に
差がある。この突出寸法の差の修正は金型への組込み前
に行われるが、その差が極めて僅かなことから修正に手
間を要し、また熟練を要するなど、解決が望まれる課題
があった。There is also a slight difference in the protrusion size from the hot runner block between the plurality of nozzles, of course. The correction of the difference in the protruding dimension is performed before the assembly into the mold, but the difference is extremely small, which requires a lot of trouble to correct and requires skill, and there is a problem to be solved.
【０００５】この発明は上記従来の課題を解決するため
に考えられたものであって、その目的は、形状記憶合金
が有する弾性変形回復力を利用して、ノズルの突出寸法
差に左右されず、また適度な加圧力の下に確実なノズル
の当接を行い得る新たな射出成形用金型を提供すること
にある。The present invention has been conceived in order to solve the above-mentioned conventional problems, and its purpose is to utilize the elastic deformation recovery force of the shape memory alloy and not be influenced by the difference in the projection size of the nozzle. , and to provide a new injection mold capable of performing abutment reliable nozzles under moderate pressure.
【０００６】[0006]
【課題を解決するための手段】上記目的によるこの発明
の特徴は、複数のキャビティを有し、その各キャビティ
のゲートにホットランナノズルを当接した射出成形用金
型において、該ホットランナノズルを形状記憶合金によ
り形成してなることにある。According to the features of the present invention according to the above object, in a mold for injection molding having a plurality of cavities and a hot runner nozzle abutting the gate of each cavity, the hot runner nozzle is It is made of a shape memory alloy.
【０００７】[0007]
【作用】上記構成では、形状記憶合金によるノズルが、
当接時の加圧力により圧縮変形して各キャビティのゲー
トに密着し、また弾性変形回復力により、その密着は充
分な当接力の下に維持される。In the above structure, the nozzle made of shape memory alloy is
Due to the pressure applied at the time of contact, they are compressed and deformed to make close contact with the gate of each cavity, and due to the elastic deformation recovery force, the close contact is maintained under a sufficient contact force.
【０００８】[0008]
【実施例】図中１は固定金型で、パーティング部分に可
動金型２のコア型３と型閉する同一形状の複数のキャビ
ティ４，４を有する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 in the drawing is a fixed mold having a plurality of cavities 4 and 4 of the same shape for closing a core mold 3 of a movable mold 2 in a parting part.
【０００９】５は固定金型内のホットランナブロック
で、背部中央に設けたスプルブッシュ６から、上記キャ
ビティ４，４のゲート位置まで、同数のホットランナ
７，７が穿設してある。Reference numeral 5 is a hot runner block in the fixed mold, in which the same number of hot runners 7, 7 are bored from the sprue bush 6 provided at the center of the back to the gate positions of the cavities 4, 4.
【００１０】その各ホットランナ７，７の先端部には、
形状記憶合金をもって形成した先端がフラットなホット
ランナノズル８，８が、ねじ込みなどの手段を用いて、
突出寸法を同一に設けてある。At the tips of the hot runners 7, 7,
The hot runner nozzles 8, 8 having a flat tip formed of a shape memory alloy, are screwed or the like,
The projecting dimensions are the same.
【００１１】この形状記憶合金としては、形状回復温度
−１０〜１００℃，引張強さ７０〜１１０ｇ／ｃｍ２、
密度６．４ｇ／ｃｍ３の材料特性を有する株式会社神戸
製鋼所製のＴｉＮｉ合金を採用することができる。この
形状記憶合金では上記形状回復温度範囲において、数パ
ーセントの大きな変形歪みがもとに戻る超弾性特性を有
し、また８パーセント変形しても、除荷時には完全にも
との形状に戻り、形状回復時に３０Ｋｇ／ｍｍ２を超す
大きな回復力を発生する。This shape memory alloy has a shape recovery temperature of -10 to 100 ° C., a tensile strength of 70 to 110 g / cm 2 ,
A TiNi alloy manufactured by Kobe Steel, Ltd. having a material property of a density of 6.4 g / cm 3 can be adopted. This shape memory alloy has a superelastic characteristic in which a large deformation strain of several percent is restored in the shape recovery temperature range, and even if it deforms by 8 percent, it returns to its original shape upon unloading, When recovering the shape, a large recovery force of more than 30 kg / mm 2 is generated.
【００１２】上記ホットランナノズル８，８のキャビテ
ィゲート９，９への当接は、ホットランナブロック５の
背面と型取付板１０との間に、所要厚さの板体１１を挿
入して行われ、これにより各ホットランナノズル８，８
のフラットな先端面は、キャビティゲート周囲の壁面に
強く圧接されるとともに、ノズル自体はその圧力によ
り、溶融樹脂の射出を妨げない範囲にて圧縮変形する。The hot runner nozzles 8 and 8 are brought into contact with the cavity gates 9 and 9 by inserting a plate body 11 having a required thickness between the back surface of the hot runner block 5 and the die mounting plate 10. As a result, each hot runner nozzle 8,8
The flat tip surface of the nozzle is strongly pressed against the wall surface around the cavity gate, and the nozzle itself is compressed and deformed by the pressure within a range that does not hinder the injection of the molten resin.
【００１３】この圧縮変形により複数のホットランナノ
ズル８，８は個々に密着するようになり、また弾性変形
回復力が当接力として作用するため、その密着は充分な
加圧力の下に維持され、射出時の樹脂漏れを完全に防止
する。Due to this compression deformation, the plurality of hot runner nozzles 8 and 8 come into close contact with each other, and the elastic deformation recovery force acts as an abutment force, so that the close contact is maintained under a sufficient pressure. Completely prevent resin leakage during injection.
【００１４】なお、図中１２はノックアウトピン、１３
は可動金型側の型取付板である。In the figure, 12 is a knockout pin, 13
Is a mold mounting plate on the movable mold side.
【００１５】[0015]
【発明の効果】この発明は上述のように、ホットランナ
ノズル８，８を形状記憶合金により形成してなることか
ら、形状記憶合金が有する弾性変形回復力を利用して、
ノズルの当接を密に、しかも充分な加圧力をもってキャ
ビティゲートに当接することができ、当接力の弱さから
樹脂漏れが生ずるようなことがない。As described above, according to the present invention, the hot runner nozzles 8 and 8 are made of a shape memory alloy. Therefore, the elastic deformation recovery force of the shape memory alloy is utilized to
The nozzles can be brought into close contact with the cavity gate with a sufficient pressing force, and resin leakage does not occur due to the weak contact force.
【００１６】また各ホットランナノズルの突出寸法に僅
かな差があっても、ホットランナノズルの個々の圧縮変
形の度合いにより、その差は自然に補正されるので、当
接前に突出寸法を厳密に揃える必要がない。Further, even if there is a slight difference in the protruding size of each hot runner nozzle, the difference is naturally corrected depending on the degree of compressive deformation of each hot runner nozzle. There is no need to align them.
【００１７】さらにまた、ホットランナノズルを形状記
憶合金により形成するだけで、他に特別な手段を施す必
要はないので、従来構造の射出用金型にも直ちに応用で
きるなどの特長を有する。Further, since the hot runner nozzle is formed of a shape memory alloy and no special means is required, it has a feature that it can be immediately applied to an injection mold having a conventional structure.
図１はこの発明に係わる射出成形用金型の略示縦断面図
である。FIG. 1 is a schematic vertical sectional view of an injection molding die according to the present invention.
１ 固定金型 ２ 可動金型 ３ コア型 ４ キャビティ ５ ホットランナブロック ６ スプルブッシュ ７ ホットランナ ８ ホットランナノズル ９ キャビティゲート １０ 型取付板 １１ 板体 １２ ノックアウトピン １３ 可動金型側の型取付板1 Fixed mold 2 Movable mold 3 Core mold 4 Cavity 5 Hot runner block 6 Sprue bush 7 Hot runner 8 Hot runner nozzle 9 Cavity gate 10 Mold mounting plate 11 Plate 12 Knockout pin 13 Movable mold side mold mounting plate
Claims (1)
ティのゲートにホットランナノズルを当接した射出成形
用金型において、該ホットランナノズルを形状記憶合金
により形成してなることを特徴とする射出成形用金型。1. An injection-molding die having a plurality of cavities, each of which has a hot runner nozzle in contact with the gate of the cavity, wherein the hot runner nozzle is formed of a shape memory alloy. Injection mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41395890A JPH0712629B2 (en) | 1990-12-26 | 1990-12-26 | Injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP41395890A JPH0712629B2 (en) | 1990-12-26 | 1990-12-26 | Injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04223120A JPH04223120A (en) | 1992-08-13 |
| JPH0712629B2 true JPH0712629B2 (en) | 1995-02-15 |
Family
ID=18522506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP41395890A Expired - Fee Related JPH0712629B2 (en) | 1990-12-26 | 1990-12-26 | Injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712629B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7165958B2 (en) * | 2004-04-23 | 2007-01-23 | Husky Injection Molding Systems Ltd. | Apparatus for adjustable hot runner assembly seals and tip height using active material elements |
-
1990
- 1990-12-26 JP JP41395890A patent/JPH0712629B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04223120A (en) | 1992-08-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |