JPH0435329B2 - - Google Patents
Info
- Publication number
- JPH0435329B2 JPH0435329B2 JP59050561A JP5056184A JPH0435329B2 JP H0435329 B2 JPH0435329 B2 JP H0435329B2 JP 59050561 A JP59050561 A JP 59050561A JP 5056184 A JP5056184 A JP 5056184A JP H0435329 B2 JPH0435329 B2 JP H0435329B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle body
- electric heater
- nozzle
- cover member
- tip
- 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
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin 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
- B29C45/20—Injection 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
- B29C45/72—Heating or cooling
- B29C45/74—Heating or cooling of the injection unit
Description
【発明の詳細な説明】
この発明は合成樹脂の成形に用いられる射出装
置のノズルに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle for an injection device used for molding synthetic resin.
冷却手段を備えた金型にノズルを接触させて、
射出シリンダ内の溶融樹脂を金型に注入する射出
成形では、金型の冷却手段によつて、ノズル側も
冷却され易く、これを防止する目的から、射出シ
リンダとは別にノズル本体をも加熱している。 By bringing the nozzle into contact with a mold equipped with cooling means,
In injection molding, in which the molten resin in the injection cylinder is injected into the mold, the nozzle side is also likely to be cooled by the cooling means of the mold, and to prevent this, the nozzle body is also heated separately from the injection cylinder. ing.
このノズル本体の加熱は、バンドヒータを巻設
したり、或はカートリツジヒータを埋設するかな
どして行つているが、ヒータとノズル本体との密
着性が悪いことから、加熱効率が低く、ノズル本
体における熱分布も不均一となりがちであつた。 The nozzle body is heated by winding a band heater or burying a cartridge heater, but the heating efficiency is low due to poor adhesion between the heater and the nozzle body. Heat distribution in the nozzle body also tended to be uneven.
またノズル本体の外周面にコイル状に形成した
電熱ヒータを嵌挿し、その電熱コイルヒータに円
筒形のカバーを被せて、加熱効率を向上させる構
造が特公昭59−4295号により開示されているが、
この場合であつても、電熱コイルヒータとノズル
本体との密着性までをも改善するに至らず、カバ
ーにより加熱効率が高められても、ノズル本体の
加熱を均一に行うとができないものであつた。 Furthermore, Japanese Patent Publication No. 59-4295 discloses a structure in which an electric heater formed in a coil shape is inserted into the outer peripheral surface of the nozzle body and a cylindrical cover is placed over the electric coil heater to improve heating efficiency. ,
Even in this case, even the adhesion between the electric coil heater and the nozzle body cannot be improved, and even if the heating efficiency is increased by the cover, the nozzle body cannot be heated uniformly. Ta.
この発明は、上記従来技術で確実性を欠く電熱
ヒータとノズル本体との密着性の問題を解決する
ために考えられたものであつて、その発明の目的
とするところは、複雑な手段を用いることなく、
カバー部材を利用して電熱ヒータをノズル本体に
密着することができ、加熱効果の向上と相俟つ
て、ノズル本体を外周囲から均に加熱することが
できる新たな構成の射出装置のノズルを提供する
ものである。 This invention was devised to solve the problem of the unreliable adhesion between the electric heater and the nozzle body in the prior art, and the purpose of the invention is to use complicated means. without any
Provided is a nozzle for an injection device with a new configuration in which an electric heater can be brought into close contact with a nozzle body using a cover member, which improves the heating effect and can evenly heat the nozzle body from the outside. It is something to do.
上記目的によるこの発明の特徴は、射出シリン
ダの先端部と螺合する取付部より突出したノズル
本体の外周囲に、螺旋状に形成した電熱ヒータを
嵌装し、その電熱ヒータをカバー部材により被覆
したノズルにおいて、上記ノズル本体の外周面と
カバー部材の内周面とを同一テーパ面に形成する
とともに、カバー部材の後端にフランジを一体に
設け、そのフランジを上記取付部に止着して、上
記電熱ヒータを両テーパー面によりノズル本体の
外周囲に圧接してなることにある。 A feature of the present invention for the above-mentioned purpose is that an electric heater formed in a spiral shape is fitted around the outer periphery of a nozzle body that protrudes from a mounting portion that is screwed into the tip of an injection cylinder, and the electric heater is covered with a cover member. In the nozzle, the outer peripheral surface of the nozzle body and the inner peripheral surface of the cover member are formed into the same tapered surface, and a flange is integrally provided at the rear end of the cover member, and the flange is fixed to the mounting portion. , the electric heater is pressed against the outer periphery of the nozzle body by both tapered surfaces.
以下この発明を図示の例により詳細に説明す
る。 The present invention will be explained in detail below using illustrated examples.
図中１はスクリユ２を内装した射出シリンダ
で、外周囲に電熱ヒータ３を有する。 In the figure, 1 is an injection cylinder with a screw 2 inside, and an electric heater 3 around the outside.
４はノズル本体で、射出シリンダ１の先端部に
突設したねじ部１ａと螺合する取付部５と一体形
成され、かつ内部に通路６を有する。このノズル
本体４は、先端部４ａを除いて後方へ順次大径に
形成され、外周面は先端部４ａに形成した段部７
より上記取付部５の端面にわたるテーパ面となつ
ている。更にまたテーパ面には軸方向に溝８が設
けてある。 Reference numeral 4 denotes a nozzle body, which is integrally formed with a mounting portion 5 that is screwed into a threaded portion 1a protruding from the tip of the injection cylinder 1, and has a passage 6 inside. This nozzle body 4 is formed so that its diameter gradually increases toward the rear except for the tip 4a, and the outer circumferential surface has a stepped portion 7 formed at the tip 4a.
The mounting portion 5 has a tapered surface extending over the end surface thereof. Furthermore, a groove 8 is provided in the tapered surface in the axial direction.
９は両端が開口したカバー部材で、先端開口は
上記ノズル本体４の先端部４ａと嵌合する内径か
らなり、かつ後開口には取付用のフランジ１０が
一体形成してある。またカバー部材９の内周面
は、先端部内に設けた段部１１から後端開口にか
けて、ノズル本体４の外周囲と同一角度をなすテ
ーパ面に形成されており、この２つのテーパ面の
間に、電熱ヒータ１２の線径と等しいか若干大き
目の間隙１３が生じている。 Reference numeral 9 denotes a cover member with openings at both ends, the tip opening having an inner diameter that fits into the tip 4a of the nozzle body 4, and the rear opening having an integrally formed flange 10 for attachment. The inner peripheral surface of the cover member 9 is formed into a tapered surface that forms the same angle as the outer periphery of the nozzle body 4 from the stepped portion 11 provided in the tip end to the rear end opening, and there is a tapered surface between these two tapered surfaces. A gap 13 is formed which is equal to or slightly larger than the wire diameter of the electric heater 12.
上記電熱ヒータ１２は、金属細管中に高密度に
圧縮した絶縁物と共に発熱線を封入したシーズヒ
ータを、ノズル本体４のテーパ面に合わせて円錐
台形に巻回したものからなり、後端にリード線１
４が接続してある。 The electric heater 12 is made of a sheathed heater in which a heating wire is enclosed together with a highly densely compressed insulator in a thin metal tube, which is wound into a truncated conical shape in accordance with the tapered surface of the nozzle body 4, and has a lead at the rear end. line 1
4 is connected.
この電熱ヒータ１２は、ノズル本体４の先端か
ら外周面に嵌込んで取付けられ、更にその上に上
記カバー部材９が嵌込まれる。この嵌込みは、電
熱ヒータ１２及びカバー部材９の後端開口が、ノ
ズル先端部４ａの外径よりも大きく形成されてい
ることから容易に行うことができる。またノズル
本体４の外周面とカバー部材９の内周面とが共に
同一角度のテーパ面に形成されているために、カ
バー部材９をもつて電熱ヒータ１２をノズル本体
４の外周面に押圧することができ、その押圧はフ
ランジ１０を取付部５の端面にボルト１５をもつ
て固定することにより維持できる。この結果、電
熱ヒータ１２の各巻線はノズル本体４の外周面に
密着し、ノズル本体４は均一に加熱される。 The electric heater 12 is attached to the nozzle body 4 by being fitted into the outer peripheral surface from the tip thereof, and the cover member 9 is further fitted thereon. This fitting can be easily performed because the rear end openings of the electric heater 12 and the cover member 9 are formed larger than the outer diameter of the nozzle tip 4a. Furthermore, since the outer circumferential surface of the nozzle body 4 and the inner circumferential surface of the cover member 9 are both tapered at the same angle, the electric heater 12 is pressed against the outer circumferential surface of the nozzle body 4 using the cover member 9. This pressure can be maintained by fixing the flange 10 to the end face of the mounting portion 5 with bolts 15. As a result, each winding of the electric heater 12 comes into close contact with the outer peripheral surface of the nozzle body 4, and the nozzle body 4 is heated uniformly.
１６は電熱対で、上記溝８に位置させてあり、
先端はノズル本体４の先端部４ａに埋設してあ
る。 16 is an electric thermocouple located in the groove 8,
The tip is embedded in the tip 4a of the nozzle body 4.
なお、コイルヒータを使用する場合、図面は省
略したが、その線径の約半分が埋設されるべく、
ノズル本体４のヒータ取付部外周に螺旋状の案内
溝をつけば、コイルの間隔があいていても、コイ
ルにズレを生ずることも無く、均一な加熱分布が
得られ、伝熱効率も高いものとなり、加熱密度が
小さい場合にも有効である。したがつて、この発
明は図示された実施例のみに限定されるものでは
ない。 In addition, when using a coil heater, although the drawing is omitted, approximately half of the wire diameter should be buried.
If a spiral guide groove is provided on the outer periphery of the heater attachment part of the nozzle body 4, even if the coils are spaced apart, there will be no misalignment of the coils, uniform heating distribution will be obtained, and heat transfer efficiency will be high. , is also effective when the heating density is low. Therefore, the invention is not limited to the embodiments shown.
この発明は上述のように、ノズル本体４の外周
面とカバー部材９の内周面とを同一テーパ面に形
成し、そのテーパ面によりノズル本体４の外周囲
に巻設した電熱ヒータ１２を、ノズル本体４の外
周面に圧接してなるものであるから、電熱ヒータ
とノズル本体との密着性が良好となり、ノズルの
温度調節が設定通り均一化して精度が一段と向上
するばかりか、カバー部材により外部放熱が防止
されるなど、射出成形上きわめて効率のよいもの
となる。また電熱ヒータのノズル本体への伝熱効
率も高く、非接触部分もなくなるので、当該部分
に生じがちな異常高温も防止でき、電熱ヒータの
寿命も長くなる。 As described above, in this invention, the outer circumferential surface of the nozzle body 4 and the inner circumferential surface of the cover member 9 are formed into the same tapered surface, and the electric heater 12 is wound around the outer circumference of the nozzle body 4 using the tapered surface. Since it is in pressure contact with the outer circumferential surface of the nozzle body 4, the adhesion between the electric heater and the nozzle body is good, and the nozzle temperature control is made uniform according to the setting, which not only improves the accuracy further, but also improves the accuracy of the nozzle temperature control. External heat radiation is prevented, making injection molding extremely efficient. Furthermore, the efficiency of heat transfer to the nozzle body of the electric heater is high, and since there are no non-contact parts, abnormal high temperatures that tend to occur in these parts can be prevented, and the life of the electric heater can be extended.
更にまた、テーパ面を利用して電熱ヒータをノ
ズル本体に圧接したので、電熱ヒータの密着は径
に左右されず実施でき、またノズル本体の外径に
も影響されず同一手段をもつて電熱ヒータを取付
けることができるため、きわめて小型のノズルに
も応用することができる利点があり、カバー部材
９も後端のフランジ１０により取付部５に止着し
て、ノズル本体４に固定されるので、震動等によ
り電熱ヒータ１２の圧接が緩むことがなく、長く
圧接状態を維持できる。 Furthermore, since the electric heater is pressed into contact with the nozzle body using the tapered surface, the close contact of the electric heater can be achieved regardless of the diameter, and the electric heater can be attached by the same means without being affected by the outer diameter of the nozzle body. Since the cover member 9 can be attached to the nozzle body 4, it has the advantage that it can be applied to extremely small nozzles. The pressure contact of the electric heater 12 does not loosen due to vibrations, etc., and the pressure contact state can be maintained for a long time.
しかもノズル先端部の直径に対して電熱ヒータ
及びカバー部材の後端開口の内径が著しく大きい
ことから、それら部材の着脱が容易で、組付、保
守などをスムーズに行い得るなどの特長を有す
る。 Furthermore, since the inner diameter of the rear end opening of the electric heater and cover member is significantly larger than the diameter of the nozzle tip, these members can be easily attached and detached, and assembly and maintenance can be carried out smoothly.
図面はこの発明に係る射出装置のノズルを例示
するもので、第１図は縦断側面図、第２図は要部
縦断正面図である。
１……射出シリンダ、４……ノズル本体、５…
…取付部、９……カバー部材、１０……フラン
ジ、１２……電熱ヒータ。
The drawings illustrate a nozzle of an injection device according to the present invention, and FIG. 1 is a longitudinal sectional side view, and FIG. 2 is a longitudinal sectional front view of the main part. 1...Injection cylinder, 4...Nozzle body, 5...
...Mounting portion, 9...Cover member, 10...Flange, 12...Electric heater.
Claims (1)
突出したノズル本体の外周囲に、螺旋状に形成し
た電熱ヒータを嵌装し、その電熱ヒータをカバー
部材により被覆したノズルにおいて、 上記ノズル本体の外周囲とカバー部材の内周面
とを同一テーパ面に形成するとともに、カバー部
材の後端にフランジを一体に設け、そのフランジ
を上記取付部に止着して、上記電熱ヒータを両テ
ーパ面によりノズル本体の外周面に圧接してなる
ことを特徴とする射出装置のノズル。[Scope of Claims] 1. A nozzle in which an electric heater formed in a spiral shape is fitted around the outer periphery of a nozzle body that protrudes from a mounting portion that screws into the tip of an injection cylinder, and the electric heater is covered with a cover member. In the above, the outer periphery of the nozzle body and the inner periphery of the cover member are formed into the same tapered surface, and a flange is integrally provided at the rear end of the cover member, and the flange is fixed to the mounting portion. A nozzle for an injection device, characterized in that an electric heater is pressed against the outer peripheral surface of a nozzle body by both tapered surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5056184A JPS60193625A (en) | 1984-03-16 | 1984-03-16 | Nozzle for injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5056184A JPS60193625A (en) | 1984-03-16 | 1984-03-16 | Nozzle for injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60193625A JPS60193625A (en) | 1985-10-02 |
| JPH0435329B2 true JPH0435329B2 (en) | 1992-06-10 |
Family
ID=12862415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5056184A Granted JPS60193625A (en) | 1984-03-16 | 1984-03-16 | Nozzle for injector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60193625A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3724088A1 (en) * | 1987-07-21 | 1989-02-02 | Ewikon Entwicklung Konstr | SURFACE HEATING ELEMENT FOR TOOL AND MACHINE PARTS |
| CA1265909A (en) * | 1988-02-16 | 1990-02-20 | Jobst Ulrich Gellert | Injection molding heated gate insert and method |
| US4926029A (en) * | 1988-07-08 | 1990-05-15 | Minnesota Mining And Manufacturing Company | Method and combination for heating and dispensing hot melt materials |
| US5524792A (en) * | 1992-07-08 | 1996-06-11 | Murata Manufacturing Co., Ltd. | Cup vendor delivery nozzle |
| CN106061706A (en) * | 2014-03-04 | 2016-10-26 | 圣万提注塑工业（苏州）有限公司 | Heating sleeve for injection molding nozzle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6024569Y2 (en) * | 1979-05-21 | 1985-07-23 | 住友重機械工業株式会社 | Heater for heating the conical part of a molding machine |
| JPS57199426U (en) * | 1981-06-13 | 1982-12-18 |
-
1984
- 1984-03-16 JP JP5056184A patent/JPS60193625A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60193625A (en) | 1985-10-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |