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JP4491520B2 - Hot runner mold - Google Patents
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JP4491520B2 - Hot runner mold - Google Patents

Hot runner mold Download PDF

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JP4491520B2
JP4491520B2 JP2004302525A JP2004302525A JP4491520B2 JP 4491520 B2 JP4491520 B2 JP 4491520B2 JP 2004302525 A JP2004302525 A JP 2004302525A JP 2004302525 A JP2004302525 A JP 2004302525A JP 4491520 B2 JP4491520 B2 JP 4491520B2
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nozzle
mold
recess
resin
hot runner
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JP2006110927A (en
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幸雄 洞奥
稔 笹村
克久 豊島
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株式会社型システム
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Description

本発明は、ホットランナー金型に関し、詳細には、固定型又はゲートパッドとノズルが平面状に面接触してシール構造が形成されるホットランナー金型に関する。   The present invention relates to a hot runner mold, and more particularly to a hot runner mold in which a fixed mold or a gate pad and a nozzle are in surface contact with each other to form a seal structure.

ホットランナー金型は、マニホールドとノズルをヒータで温度制御し、溶融樹脂をゲートからキャビティに射出して成形品を製造するもので、ランナーやスプルーが出ないことから廃プラスチック対策に優れ、また成形サイクルが短縮化される等の利点がある。   The hot runner mold is manufactured by controlling the temperature of the manifold and nozzle with a heater and injecting molten resin from the gate to the cavity to produce a molded product. There are advantages such as shortening the cycle.

このような特徴のあるホットランナー金型は、ノズルから射出された溶融樹脂を滞留させ、ノズルと固定型又はゲートパッドとの間に成形用樹脂自体による樹脂断熱層、あるいは成形用樹脂より高融点の樹脂による樹脂断熱層を形成させるが、該樹脂断熱層からの溶融樹脂の漏出を防ぐためのシール構造が必要となる。シール構造には、従来、図3に示すホットランナー金型100のように、固定型60の内周面とノズル70の外周面が周状に面接触してシール構造80が形成されるものがある(他に特許文献1参照)。また、ノズルの先端側外周部にシールリングを嵌着させてシール構造が形成されるものがある(特許文献2参照)。
特開2002−96359号公報(図1) 特開2002−113746号公報(図1、図2)
The hot runner mold with such characteristics retains the molten resin injected from the nozzle and has a higher melting point than the resin heat insulating layer formed by the molding resin itself or between the nozzle and the fixed mold or gate pad. The resin heat insulating layer is formed of the above resin, but a seal structure for preventing leakage of the molten resin from the resin heat insulating layer is required. Conventionally, as in the hot runner mold 100 shown in FIG. 3, the seal structure has a structure in which the inner peripheral surface of the fixed mold 60 and the outer peripheral surface of the nozzle 70 are in circumferential contact with each other to form the seal structure 80. There are others (see Patent Document 1). Also, there is a type in which a seal structure is formed by fitting a seal ring to the outer peripheral portion on the tip end side of the nozzle (see Patent Document 2).
JP 2002-96359 A (FIG. 1) JP 2002-113746 A (FIGS. 1 and 2)

ホットランナー金型は、メンテナンス、成形用樹脂の変更、あるいは製品(成形品)を変更するために製品部(固定型と可動型)を交換する等の際、金型からノズルを取り外さなければならない。一方、樹脂の溶融状態を維持させるためにノズルは加熱され、キャビティに射出された溶融樹脂を固化させるために固定型又はゲートパッドは冷却される。そのため、ノズルと固定型又はゲートパッドとの温度差は100℃以上となり、ノズルの径は熱膨張するのに対し、固定型又はゲートパッドは熱膨張しない。したがって、上記従来のノズルと固定型又はゲートパッドの間が周状に面接触してシール構造を形成するホットランナー金型では、加熱されたノズルの熱が冷めるのを待たずに金型から取り外そうとすると、ノズルの径方向の熱膨張に起因して、いわゆる「カジリ」が生じて金型を痛め、ひいてはシール構造からの溶融樹脂の漏出や金型の寿命の低下を招くことがあった。また、ノズルの熱が冷めるのを待つことにより作業効率の著しい低下を招いていた。更に、特許文献2に記載のシールリングによりシール構造が形成されるホットランナー金型も、ノズルに固定されたシールリングが固定型又はゲートパッドと周状に面接触することから同様の問題があった。   For hot runner molds, the nozzle must be removed from the mold when performing maintenance, changing the resin for molding, or exchanging the product part (fixed mold and movable mold) to change the product (molded product). . On the other hand, the nozzle is heated to maintain the molten state of the resin, and the fixed mold or the gate pad is cooled to solidify the molten resin injected into the cavity. Therefore, the temperature difference between the nozzle and the fixed mold or the gate pad is 100 ° C. or more, and the diameter of the nozzle is thermally expanded, whereas the fixed mold or the gate pad is not thermally expanded. Therefore, in the hot runner mold in which the conventional nozzle and the fixed mold or the gate pad are in surface contact with each other to form a seal structure, the heated nozzle is removed from the mold without waiting for the heat of the nozzle to cool down. Attempting to remove it may cause so-called galling due to thermal expansion in the radial direction of the nozzle, damaging the mold, leading to leakage of molten resin from the seal structure and shortening of the mold life. It was. Also, waiting for the nozzle heat to cool has caused a significant reduction in work efficiency. Furthermore, the hot runner mold in which the seal structure is formed by the seal ring described in Patent Document 2 also has the same problem because the seal ring fixed to the nozzle is in surface contact with the fixed mold or the gate pad. It was.

本発明は、上記の事情に鑑みなされたものであり、加熱されたノズルの熱が冷めるのを待たず金型からのノズルの取り外しを上記の不都合を伴うことなく行えるホットランナー金型を提供することを課題とする。   The present invention has been made in view of the above circumstances, and provides a hot runner mold capable of removing the nozzle from the mold without waiting for the heat of the heated nozzle to cool without accompanying the above-described disadvantages. This is the issue.

上記の課題を解決するための発明は、固定型又はゲートパッドに形成される凹部内に組み込まれたノズルからキャビティ内に溶融樹脂が射出されるホットランナー金型において、前記凹部はノズルの径より拡径された径を有する第1の凹部と、該第1の凹部の底部に連通する第2の凹部とからなり、前記第1の凹部の底部周りには円筒部と鍔状部を備える環状スリーブが形成され、該環状スリーブは前記第1の凹部の底部と前記鍔状部との間に形成される付勢手段により付勢され、また、前記ノズルは先端側を除く外周に外輪部が形成されるノズルハウジングを備え、前記ノズルを前記凹部に組み込むことにより前記外輪部の先端面が前記鍔状部における第1の凹部の開口側に向く面に当接し、平面状の面接触によりシール構造が形成されることを特徴とするホットランナー金型を要旨とする。この構成により、ノズルが径方向に熱膨張してもノズルを金型から不都合なく取り外すことが可能となる。 The invention for solving the above-mentioned problem is a hot runner mold in which molten resin is injected into a cavity from a nozzle incorporated in a recessed part formed in a fixed mold or a gate pad. The first concave portion having an enlarged diameter and the second concave portion communicating with the bottom portion of the first concave portion, and an annular shape having a cylindrical portion and a bowl-shaped portion around the bottom portion of the first concave portion A sleeve is formed, and the annular sleeve is biased by a biasing means formed between the bottom of the first recess and the bowl-shaped portion, and the outer ring portion of the nozzle has an outer ring portion on the outer periphery excluding the tip side. A nozzle housing formed, and by incorporating the nozzle into the recess, the front end surface of the outer ring portion comes into contact with the surface of the flange-shaped portion facing the opening side of the first recess, and is sealed by planar surface contact. Structure is formed The gist of the hot runner mold which is characterized the door. With this configuration, the nozzle can be removed from the mold without any inconvenience even when the nozzle is thermally expanded in the radial direction.

上記の発明において、第2の凹部の内周に成形用樹脂より高融点の樹脂による樹脂断熱層が形成しても良い。この構成により、成形用樹脂の変更が容易になる。 In the above invention, a resin heat insulating layer made of a resin having a melting point higher than that of the molding resin may be formed on the inner periphery of the second recess. With this configuration, the molding resin can be easily changed.

本発明のホットランナー金型によれば、シール性を確実に保ち、かつノズルの熱が冷めるのを待たず金型から取り外すことができ、また、ノズルの熱を冷めるのを待たずノズルを取り付けることもできるので、ノズルの着脱作業の効率化を図ることができ、ひいては成形品の製造を効率的に行うことができる。また、ノズルの取り外し取り付けの際に「カジリ」が生じることがないので、金型の保全に資することができる。   According to the hot runner mold of the present invention, the sealing performance can be reliably maintained, the nozzle can be removed from the mold without waiting for the heat of the nozzle to cool, and the nozzle can be attached without waiting for the nozzle to cool. Therefore, it is possible to improve the efficiency of the nozzle attaching / detaching operation, and as a result, it is possible to efficiently produce the molded product. In addition, since no galling occurs when the nozzle is removed and attached, it is possible to contribute to the maintenance of the mold.

以下、本発明を図面を参照しながら実施の形態により説明する。図1は本実施形態に係るホットランナー金型50のノズル40が凹部20に組み込まれた状態を示す縦断面図であり、図2は本実施形態に係るホットランナー金型50のノズル40が凹部20から取り外された状態を示す縦断面図である。   Hereinafter, the present invention will be described by way of embodiments with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a state in which the nozzle 40 of the hot runner mold 50 according to the present embodiment is incorporated in the recess 20, and FIG. 2 shows the nozzle 40 of the hot runner mold 50 according to the present embodiment as a recess. It is a longitudinal cross-sectional view which shows the state removed from 20. FIG.

図2に示すように、固定型10には、ノズル40の径より拡径された径を有する第1の凹部21と該第1の凹部21の底部に連通する第2の凹部22とからなる凹部20が形成されている。   As shown in FIG. 2, the fixed mold 10 includes a first recess 21 having a diameter larger than the diameter of the nozzle 40 and a second recess 22 communicating with the bottom of the first recess 21. A recess 20 is formed.

図1及び図2に示すように、第1の凹部21の底部には、環状スリーブ30が形成されている。環状スリーブ30は、円筒部31と該円筒部31の周縁の鍔状部32とから構成されている。環状スリーブ30は、第1の凹部21に嵌入され、円筒部31の一部は第2の凹部22の内周面に嵌合している。また、環状スリーブ30は、C字状留め具33により外側方向(図1の右方向)への移動が規制されている。第1の凹部21の底部には、皿バネ34が設けられ、環状スリーブ30を裏側から外側に向け付勢している。   As shown in FIGS. 1 and 2, an annular sleeve 30 is formed at the bottom of the first recess 21. The annular sleeve 30 includes a cylindrical portion 31 and a flange-like portion 32 on the periphery of the cylindrical portion 31. The annular sleeve 30 is fitted into the first concave portion 21, and a part of the cylindrical portion 31 is fitted to the inner peripheral surface of the second concave portion 22. Further, the movement of the annular sleeve 30 in the outer direction (right direction in FIG. 1) is restricted by the C-shaped fastener 33. A disc spring 34 is provided at the bottom of the first recess 21 to urge the annular sleeve 30 outward from the back side.

第2の凹部22の先端中央にゲート23が形成され、成形用樹脂の変更を容易にするため、先端方向の内周には溶融樹脂より高融点の樹脂からなる樹脂断熱層36が形成されている。   A gate 23 is formed at the center of the tip of the second recess 22, and a resin heat insulating layer 36 made of a resin having a melting point higher than that of the molten resin is formed on the inner periphery in the tip direction in order to facilitate the change of the molding resin. Yes.

可動型11と固定型10間に形成されるキャビティ12には、ゲート23から溶融樹脂が射出される。また、ノズルハウジング41の外周は、ノズル40が凹部20内に組み込まれた際に鍔状部32の外側面に当接する外輪部42が形成されている。さらに、外輪部42の外側にはノズルヒータ43が設けられている。   Molten resin is injected from the gate 23 into the cavity 12 formed between the movable mold 11 and the fixed mold 10. Further, the outer periphery of the nozzle housing 41 is formed with an outer ring portion 42 that comes into contact with the outer surface of the bowl-shaped portion 32 when the nozzle 40 is incorporated into the recess 20. Further, a nozzle heater 43 is provided outside the outer ring portion 42.

次いで、上記のように構成されるホットランナー金型50の作用について説明する。ノズル40と固定型10を平面状に面接触させようとすると、ノズル40は熱膨張し、固定型10は冷却により熱膨張しないため、両者が面接触するシール位置やノズル40の押し付け力のコントロールが難しいという問題がある。しかし、本発明のホットランナー金型50は、長さ方向に熱膨張したノズル40により環状スリーブ30が内側方向に移動し
(樹脂断熱層36の樹脂は半溶融状態なので移動可能)、更に皿バネ34の付勢力でより密なシール構造35が形成されるので、シール位置やノズル40の熱膨張による押し付け力のコントロールが可能となる。また、ノズル40の凹部20内への組み付けにおいて、外輪部42を鍔状部32へ当接させる際、皿バネ34が設けられていることにより外輪部42が鍔状部32に強く当たることがないようになっている。もちろん、平面状に面接触するシール構造35が形成されるので、ノズル40の径方向の熱膨張による不都合が生じることはない。
Next, the operation of the hot runner mold 50 configured as described above will be described. When the nozzle 40 and the fixed mold 10 are brought into plane contact with each other in a plane, the nozzle 40 is thermally expanded, and the fixed mold 10 is not thermally expanded by cooling. Therefore, control of the seal position where both are in surface contact and the pressing force of the nozzle 40 is controlled. There is a problem that is difficult. However, in the hot runner mold 50 of the present invention, the annular sleeve 30 is moved inward by the nozzle 40 thermally expanded in the length direction (since the resin of the resin heat insulating layer 36 is in a semi-molten state, it can be moved), and further the disc spring Since the denser sealing structure 35 is formed by the urging force of 34, the pressing force due to the sealing position and thermal expansion of the nozzle 40 can be controlled. Further, in assembling the nozzle 40 into the recess 20, when the outer ring portion 42 is brought into contact with the hook-shaped portion 32, the outer ring portion 42 may strongly hit the hook-shaped portion 32 due to the provision of the disc spring 34. There is no such thing. Of course, since the sealing structure 35 that is in plane contact with the surface is formed, there is no inconvenience due to thermal expansion in the radial direction of the nozzle 40.

本発明はその技術的範囲の属する限り、種々形態を変更して具体化できるので、以下に例示する。
(1)本発明は、本実施形態のオープンゲート方式に限定されず、バルブゲート方式としても良い。
(2)本発明は、第2の凹部の先端方向の内周に成形用樹脂より高融点の樹脂による樹脂断熱層を形成しない構成としても良い。
(3)付勢手段は、環状スリーブを付勢できる限り、皿バネに限定されず、コイルバネ、板バネ等のバネ類、シリコンゴム、フッ素ゴム等の耐熱性ゴム等であっても良い。
(4)本発明は、本実施形態のように固定型に凹部を形成する構成の他、凹部や環状スリーブ等を備えるゲートパッドを固定型に組み入れる構成としても良い。
(5)環状スリーブは、留め具を用いず外側方向への移動を規制しない構成としても良い。
As long as the technical scope of the present invention belongs, the present invention can be embodied by changing various forms.
(1) The present invention is not limited to the open gate system of the present embodiment, and may be a valve gate system.
(2) The present invention may be configured such that a resin heat insulating layer made of a resin having a melting point higher than that of the molding resin is not formed on the inner periphery in the tip direction of the second recess.
(3) The biasing means is not limited to a disc spring as long as the annular sleeve can be biased, and may be a spring such as a coil spring or a leaf spring, or a heat resistant rubber such as silicon rubber or fluorine rubber.
(4) The present invention may be configured such that a gate pad provided with a recess, an annular sleeve, or the like is incorporated in the fixed mold in addition to the structure in which the recessed mold is formed as in the present embodiment.
(5) An annular sleeve is good also as a structure which does not regulate the movement to an outer side, without using a fastener.

本実施形態に係るホットランナー金型のノズルが凹部に組み込まれた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state in which the nozzle of the hot runner metal mold | die which concerns on this embodiment was integrated in the recessed part. 本実施形態に係るホットランナー金型のノズルが凹部から取り外された状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state by which the nozzle of the hot runner metal mold | die which concerns on this embodiment was removed from the recessed part. 従来例のホットランナー金型が凹部内に組み込まれた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state in which the hot runner metal mold | die of the prior art example was integrated in the recessed part.

符号の説明Explanation of symbols

10 固定型
11 可動型
20 凹部
21 第1の凹部
22 第2の凹部
30 環状スリーブ
31 円筒部
32 鍔状部
34 皿バネ
35 シール構造
40 ノズル
41 ノズルハウジング
42 外輪部
50 ホットランナー金型
DESCRIPTION OF SYMBOLS 10 Fixed type | mold 11 Movable type | mold 20 Recessed part 21 1st recessed part 22 2nd recessed part 30 Annular sleeve 31 Cylindrical part 32 Gutter-like part 34 Disc spring 35 Seal structure 40 Nozzle 41 Nozzle housing 42 Outer ring part 50 Hot runner mold

Claims (2)

固定型又はゲートパッドに形成される凹部内に組み込まれたノズルからキャビティ内に溶融樹脂が射出されるホットランナー金型において、前記凹部はノズルの径より拡径された径を有する第1の凹部と、該第1の凹部の底部に連通する第2の凹部とからなり、前記第1の凹部の底部周りには円筒部と鍔状部を備える環状スリーブが形成され、該環状スリーブは前記第1の凹部の底部と前記鍔状部との間に形成される付勢手段により付勢され、また、前記ノズルは先端側を除く外周に外輪部が形成されるノズルハウジングを備え、前記ノズルを前記凹部に組み込むことにより前記外輪部の先端面が前記鍔状部における第1の凹部の開口側に向く面に当接し、平面状の面接触によりシール構造が形成されることを特徴とするホットランナー金型。 In a hot runner mold in which molten resin is injected into a cavity from a nozzle incorporated in a recessed part formed in a fixed mold or a gate pad, the recessed part is a first recessed part having a diameter larger than the diameter of the nozzle. And a second recess communicating with the bottom of the first recess, and an annular sleeve having a cylindrical portion and a bowl-shaped portion is formed around the bottom of the first recess . The nozzle is biased by a biasing means formed between the bottom of the concave portion and the bowl-shaped portion, and the nozzle includes a nozzle housing in which an outer ring portion is formed on the outer periphery excluding the tip side. By incorporating the outer ring portion into the concave portion, the tip surface of the outer ring portion comes into contact with the surface of the flange-shaped portion facing the opening side of the first concave portion, and a seal structure is formed by planar surface contact. Runner mold 第2の凹部の内周に成形用樹脂より高融点の樹脂による樹脂断熱層が形成されてなる請求項1に記載のホットランナー金型。 The hot runner mold according to claim 1, wherein a resin heat insulating layer made of a resin having a melting point higher than that of the molding resin is formed on the inner periphery of the second recess.
JP2004302525A 2004-10-18 2004-10-18 Hot runner mold Expired - Fee Related JP4491520B2 (en)

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JP5216401B2 (en) * 2008-04-21 2013-06-19 丸五ゴム工業株式会社 Nozzle for injection molding of rubber products
KR101167592B1 (en) * 2009-07-27 2012-07-27 주식회사 에이티앤에스 Manufacturing Apparatus For Bobbin
JP6732036B2 (en) * 2016-10-18 2020-07-29 Nok株式会社 Nozzle for injection molding machine

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