JP5788356B2

JP5788356B2 - Injection mold

Info

Publication number: JP5788356B2
Application number: JP2012078828A
Authority: JP
Inventors: 和年澤田
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2012-03-30
Filing date: 2012-03-30
Publication date: 2015-09-30
Anticipated expiration: 2032-03-30
Also published as: CN104203532B; JP2013208722A; KR20140130189A; WO2013146009A1; CN104203532A; KR101639501B1

Description

本発明は、ホットランナー成形に用いられる射出成形用金型に関する。 The present invention relates to an injection mold used for hot runner molding.

樹脂製の光学部品は、一般に、溶融樹脂を金型内のキャビティに充填し、冷却して固化させることで成形されている。このような、金型を用いた成形において、高い生産性を得られる成形方法として、ホットランナー成形が知られている。 In general, optical parts made of resin are molded by filling a cavity in a mold with molten resin, and solidifying by cooling. In such molding using a mold, hot runner molding is known as a molding method capable of obtaining high productivity.

ホットランナー成形に用いられる射出成形用金型の一例を、図４に示す。
この射出成形用金型１００は、固定側金型１０２と、固定側金型に対して開閉自在に稼働する可動側金型１０４とから構成されている。また、固定側金型１０２の中には、マニホールド１１０が配置されている。 An example of an injection mold used for hot runner molding is shown in FIG.
The injection mold 100 includes a fixed mold 102 and a movable mold 104 that can be opened and closed with respect to the fixed mold. A manifold 110 is arranged in the fixed mold 102.

射出成形機のノズルＮからの溶融樹脂は、マニホールド１１０に射出される。マニホールド１１０に射出された溶融樹脂は、加熱されつつ流路（ランナ）１１０ａを進行して、次いで、ホットランナーボディー１０６に流入する。溶融樹脂は、ホットランナーボディ１０６によって加熱されて、固定側金型１０２（その型板）と可動側金型１０４（その型板）との間隙に形成されるキャビティ１０８に充填される。
キャビティ１０８に充填された溶融樹脂が冷却されて固化すると、可動側金型１０４を移動して金型を開放し、キャビティ１０８内の成形品が取り出される。 Molten resin from the nozzle N of the injection molding machine is injected into the manifold 110. The molten resin injected into the manifold 110 advances through the flow path (runner) 110 a while being heated, and then flows into the hot runner body 106. The molten resin is heated by the hot runner body 106 and filled in the cavity 108 formed in the gap between the fixed mold 102 (the mold plate) and the movable mold 104 (the mold plate).
When the molten resin filled in the cavity 108 is cooled and solidified, the movable side mold 104 is moved to open the mold, and the molded product in the cavity 108 is taken out.

図４では、構成を明瞭に示すために１個しか図示していないが、このような射出成形用金型１００では、通常、複数のキャビティ１０８が設けられる。
固定側金型１０２の内部に配置されるマニホールド１１０の流路１１０ａは、複数のキャビティ１０８に溶融樹脂を充填するために、溶融樹脂を分配する流路を有する。 In FIG. 4, only one is shown for the sake of clarity, but such an injection mold 100 is usually provided with a plurality of cavities 108.
The flow path 110a of the manifold 110 disposed inside the fixed mold 102 has a flow path for distributing the molten resin in order to fill the plurality of cavities 108 with the molten resin.

一般的な射出成形用金型１００において、マニホールド１１０は、ブロック状の部材にガンドリル等のを用いた機械加工によって、樹脂の流路を形成している。そのため、マニホールド１１０の流路１１０ａ内には、図４に示すように、デッドスペース１１０ｂができてしまうことが避けられない。
溶融樹脂の流路に、このようなデッドスペース１１０ｂが有ると、このデッドスペース１１０ｂに樹脂が滞留して、流路１１０ａの内壁面に、樹脂が炭化した、いわゆる樹脂ヤケ等が付着してしまう。 In a general injection mold 100, the manifold 110 forms a resin flow path by machining using a gun drill or the like as a block-shaped member. Therefore, it is inevitable that a dead space 110b is formed in the flow path 110a of the manifold 110 as shown in FIG.
If such a dead space 110b is present in the flow path of the molten resin, the resin stays in the dead space 110b, and a so-called resin burn or the like that the resin is carbonized adheres to the inner wall surface of the flow path 110a. .

この樹脂ヤケは、マニホールド１１０の構造上、除去することが物理的に困難である。
そのため、デッドスペース１１０ｂに残存する樹脂ヤケが、流路１１０ａを流れる溶融樹脂に混入してしまい、製品品質が低下してしまう可能性が有る。特に、樹脂製の光学部品では、樹脂ヤケ等の不純物の混入防止は必須であるため、流路に樹脂ヤケが有ると、生産性が低下する懸念が有る。 This resin burn is physically difficult to remove due to the structure of the manifold 110.
Therefore, the resin burn remaining in the dead space 110b may be mixed into the molten resin flowing through the flow path 110a, and the product quality may be deteriorated. In particular, in resin optical parts, it is essential to prevent impurities such as resin burns from being mixed. Therefore, if there is resin burns in the flow path, there is a concern that productivity may be reduced.

このような問題点を解決する方法として、特許文献１や特許文献２に示されるように、マニホールドを分割可能な２つの部材で構成し、密着して締結した２つの部材の界面（接合面）で樹脂の流路を形成する方法が知られている。
この構成によれば、マニホールドを分割して、溶融樹脂の流路を開放して洗浄することが可能になるので、樹脂流路壁面の洗浄を、簡易かつ確実に行うことができる。さらに、構造的にデッドスペースを無くすことができるので、マニホールド内での樹脂の滞留を無くし、樹脂ヤケの発生を低減できる。 As a method for solving such a problem, as shown in Patent Document 1 and Patent Document 2, the manifold is composed of two members that can be divided, and an interface (joint surface) between the two members that are fastened and fastened together. A method of forming a resin flow path is known.
According to this configuration, the manifold can be divided and the flow path of the molten resin can be opened and cleaned, so that the resin flow path wall surface can be easily and reliably cleaned. Furthermore, since the dead space can be eliminated structurally, the resin stays in the manifold and the occurrence of resin burns can be reduced.

特開平５−２００７８７号公報Japanese Patent Laid-Open No. 5-200787 特開平２００２−１７２６５８号公報Japanese Patent Laid-Open No. 2002-172658

しかしながら、その反面、マニホールドを分割可能に構成すると、射出成形機から注入される溶融樹脂の圧力によって、マニホールドの界面が開いてしまい、溶融樹脂が部材の間から流出してしまう可能性が有る。 However, on the other hand, if the manifold is configured to be split, the interface of the manifold is opened by the pressure of the molten resin injected from the injection molding machine, and the molten resin may flow out between the members.

この問題を解決するために、特許文献１では、マニホールドを構成する２つの部材の界面に、流路全体を外側から囲んで凹溝を形成し、凹溝に跨がって、部材よりも熱膨張率の大きな材料からなる入れ子を嵌合し、かつ、入れ子の流路側に凹部を形成している。特許文献１には、この構成により、部材が圧力で開いた場合でも、この入れ子および凹部で溶融樹脂を留めることが記載されている。
他方、特許文献２には、マニホールドを構成する２つの部材の界面が開くことを防止するために、樹脂流路の投影面積Ｓに対して、２つの部材の締結を行う締結ネジの有効断面積ｓの総量Σｓが５０％以上、特に、６０％以上となるように、締結ネジの本数を決定することが記載されている。 In order to solve this problem, in Patent Document 1, a groove is formed on the interface between two members constituting the manifold by enclosing the entire flow path from the outside and straddles the groove, and heats more than the member. A nest made of a material having a high expansion coefficient is fitted, and a recess is formed on the flow path side of the nest. Patent Document 1 describes that with this configuration, even when a member is opened by pressure, the molten resin is retained by the insert and the recess.
On the other hand, Patent Document 2 discloses an effective cross-sectional area of a fastening screw for fastening two members with respect to a projected area S of a resin flow path in order to prevent an interface between two members constituting a manifold from opening. It is described that the number of fastening screws is determined so that the total amount Σs of s is 50% or more, particularly 60% or more.

しかしながら、特許文献１に記載された方法では、流路からの溶融樹脂の流出を防ぐことはできず、マニホールドを構成する２つの部材の界面が開いた場合には、凹溝までの領域および入れ子の凹部には溶融樹脂が流出してしまう。しかも、凹溝や入れ子を有することで、マニホールドの構造が複雑になってしまう。
また、特許文献２のように、マニホールドを構成する２つの部材を締結する締結ネジの本数を増やしても、締結を適切に行わないと２つの部材の界面が開く事を防止できない。また、締結が適切であっても、締結のみでは、２つの部材の界面が溶融樹脂の圧力によって開くことを、確実に防止できない場合も有る。 However, in the method described in Patent Document 1, it is not possible to prevent the molten resin from flowing out of the flow path, and when the interface between the two members constituting the manifold is opened, the area up to the groove and the nesting The molten resin will flow out into the recesses. In addition, the structure of the manifold becomes complicated by having the concave grooves and the inserts.
Moreover, even if the number of fastening screws that fasten the two members constituting the manifold is increased as in Patent Document 2, it is not possible to prevent the interface between the two members from opening unless the fastening is performed appropriately. Moreover, even if fastening is appropriate, it may not be possible to reliably prevent the interface between the two members from being opened due to the pressure of the molten resin, only by fastening.

本発明の目的は、前記従来技術の問題点を解決することにあり、ホットランナー成形の射出成形用金型であって、マニホールドを互いの界面で溶融樹脂の流路を形成する分割可能な２つの部材で形成して、流路の容易かつ確実な洗浄を可能にすると共に、流路のデッドスペースを無くし、さらに、溶融樹脂の圧力によって２つの部材の界面が開くことも、確実に防止できる射出成形用金型を提供することにある。 An object of the present invention is to solve the problems of the prior art described above, and is an injection mold for hot runner molding, in which a manifold can be divided into two to form a flow path of molten resin at each interface. It is possible to easily and surely clean the flow path, eliminate the dead space of the flow path, and reliably prevent the interface between the two members from opening due to the pressure of the molten resin. It is to provide an injection mold.

前記目的を達成するために、本発明は、溶融樹脂の流路が通る、内部空間を有する固定側金型と、固定側金型に対して開閉自在に可動し、固定側金型と共に、流路に連通する複数のキャビティを形成する可動側金型と、固定側金型の内部空間に配置され、溶融樹脂を複数のキャビティに分配するための分配流路を有するマニホールドとを有し、マニホールドは、互いの界面で分配流路を形成する、分割可能な第１部材および第２部材を有し、かつ、分配流路は第１部材および第２部材のいずれか一方のみの加工によって形成され、さらに、第１部材および第２部材は、双方向から締結ネジで締結されるものであり、加えて、第１部材および第２部材の分割方向において、マニホールドの外面および固定形金型の内部空間壁面に当接して、マニホールドを内部空間内の所定位置に保持するスペーサを有し、かつ、このスペーサは、マニホールドの分配流路に対応する位置に当接することを特徴とする射出成形用金型を提供する。 In order to achieve the above object, the present invention provides a fixed mold having an internal space through which a flow path of molten resin passes, and a movable mold that can be opened and closed with respect to the fixed mold. A movable-side mold that forms a plurality of cavities communicating with the path, and a manifold that is disposed in the internal space of the fixed-side mold and has a distribution channel for distributing the molten resin to the plurality of cavities. Has a splittable first member and a second member that form a distribution channel at the interface with each other, and the distribution channel is formed by processing only one of the first member and the second member Furthermore, the first member and the second member are fastened with a fastening screw from both directions. In addition, in the dividing direction of the first member and the second member, the outer surface of the manifold and the inside of the fixed mold Abut against the wall of the space Has a spacer to hold the Rudo in place in the interior space, and the spacer provides the injection mold, characterized in that the abutment at a position corresponding to the distribution channel of the manifold.

このような本発明の射出成形用金型において、締結ネジによる第１部材と第２部材との締結を、分配流路とネジ孔との距離［ｄ］、および、分配流路の幅［ｈ］が下記式
ｄ＝ａ×ｈ（ａは、２〜３）
を満たすように行うのが好ましい。
また、マニホールドにおいて、締結ネジによる締結が、分配流路と平行に行われる領域を有し、かつ、分配流路と平行な締結において、第１部材と第２部材とが双方向から締結されるのが好ましい。
また、マニホールドにおいて、締結ネジによる締結が、分配流路の延在方向に連続する領域を有し、この分配流路の延在方向に連続する領域において、第１部材からの締結と第２部材からの締結とが、交互に行われる領域を有するのが好ましい。
また、第１部材および第２部材の分割方向の厚さが、略同一であるのが好ましい。
また、第１部材および第２部材の分割方向の厚さが、１０〜３０ｍｍであるのが好ましい。
また、マニホールドにおいて、溶融樹脂の流入部を均一に囲むように一方の部材からの締結が行われるのが好ましい。
また、流入部を囲む締結位置から、分配流路の延在方向に向かって、第１部材からの締結と第２部材からの締結とが交互に行われるのが好ましい。
また、マニホールドの溶融樹脂の流入部に対応して、マニホールドの分配流路に対応する位置に当接してスペーサが配置されるのが好ましい。
さらに、マニホールドからの溶融樹脂の流出部に対応して、マニホールドの分配流路に対応する位置に当接してスペーサが配置されるのが好ましい。 In such an injection mold according to the present invention, the fastening between the first member and the second member by the fastening screw is performed using the distance [d] between the distribution flow path and the screw hole and the width [h] of the distribution flow path. ] Is the following formula d = a × h (a is 2 to 3)
It is preferable to perform so as to satisfy.
Further, the manifold has a region where the fastening by the fastening screw is performed in parallel with the distribution flow path, and the first member and the second member are fastened in both directions in the fastening in parallel with the distribution flow path. Is preferred.
Further, in the manifold, the fastening by the fastening screw has a region continuous in the extending direction of the distribution flow path, and the fastening from the first member and the second member are performed in the region continuous in the extending direction of the distribution flow path. It is preferable to have the area | region where fastening from is performed alternately.
Moreover, it is preferable that the thickness of the 1st member and the 2nd member in the division | segmentation direction is substantially the same.
Moreover, it is preferable that the thickness of the division direction of a 1st member and a 2nd member is 10-30 mm.
In the manifold, it is preferable that fastening from one member is performed so as to uniformly surround the inflow portion of the molten resin.
Moreover, it is preferable that the fastening from the first member and the fastening from the second member are alternately performed from the fastening position surrounding the inflow portion toward the extending direction of the distribution channel.
Further, it is preferable that a spacer is disposed in contact with a position corresponding to the distribution flow path of the manifold corresponding to the molten resin inflow portion of the manifold.
Furthermore, it is preferable that a spacer is disposed in contact with a position corresponding to the distribution flow path of the manifold, corresponding to the outflow portion of the molten resin from the manifold.

上記構成を有する本発明によれば、ホットランナ成形の射出成形用金型において、マニホールドを互いの界面で溶融樹脂の流路を形成する分割可能な２つの部材で形成することにより、樹脂流路の容易かつ確実な洗浄を可能にすると共に、流路のデッドスペースを無くして、樹脂ヤケ等が溶融樹脂に混入することを防止できる。
また、マニホールドを２つの部材で形成したにも関わらず、適切な締結ネジによる締結とスペーサによる保持とによって、２つの部材の界面が開くことも確実に防止できる。 According to the present invention having the above-described configuration, in the injection mold for hot runner molding, the manifold is formed by two splittable members that form the flow path of the molten resin at the interface between each other. Can be easily and reliably cleaned, and the dead space of the flow path can be eliminated to prevent the resin burn or the like from being mixed into the molten resin.
Moreover, although the manifold is formed of two members, it is possible to reliably prevent the interface between the two members from being opened by fastening with an appropriate fastening screw and holding with a spacer.

本発明の射出成形用金型の一例の概略断面図である。It is a schematic sectional drawing of an example of the injection mold of this invention. 図１に示す射出成形用金型の部分概略断面斜視図である。It is a partial schematic cross-sectional perspective view of the injection mold shown in FIG. （Ａ）は、図１に示す射出成形用金型のマニホールドの第１部材の概略上面図、（Ｂ）は、同第２部材の概略上面図、（Ｃ）は、同第１部材と第２部材との締結の一例を説明するための概念図である。(A) is a schematic top view of the first member of the manifold of the injection mold shown in FIG. 1, (B) is a schematic top view of the second member, and (C) is the first member and the first member. It is a conceptual diagram for demonstrating an example of the fastening with 2 members. 従来の射出成形金型の一例の部分概略断面図である。It is a partial schematic sectional drawing of an example of the conventional injection mold.

以下、本発明の射出成形用金型について、添付の図面に示される好適実施例を基に詳細に説明する。 Hereinafter, the injection mold according to the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings.

図１は、本発明の射出成形用金型の一例の概略断面図である。
図１に示す射出成形用金型１０は、ホットランナー成形に用いられる射出成形用金型であって、固定側金型１２と、固定側金型１２に対して開閉自在に可動する可動側金型１４とを有する。 FIG. 1 is a schematic cross-sectional view of an example of an injection mold according to the present invention.
An injection molding die 10 shown in FIG. 1 is an injection molding die used for hot runner molding, and is a fixed side die 12 and a movable side die that can be freely opened and closed with respect to the fixed side die 12. And a mold 14.

固定側金型１２は、固定側金型１２の下面を形成する固定側型板１６と、固定側型板１６の上面に配置される固定側受板１８と、固定側受板１８の上面の縁に沿って配置される固定側枠板２０と、固定側枠板２０の上面に配置され固定側金型１２の上面を形成する固定側取付板２４とを有する。
固定側金型１２は、これらの板部材が、上記のように、順次、積層され、互いに固定されて構成される。また、固定側取付板２４の上面には、射出成形機のノズルＮを挿入するノズル挿入口２４ａが設けられる。 The fixed-side mold 12 includes a fixed-side mold plate 16 that forms the lower surface of the fixed-side mold 12, a fixed-side receiving plate 18 that is disposed on the upper surface of the fixed-side mold plate 16, and an upper surface of the fixed-side receiving plate 18. The fixed side frame plate 20 is disposed along the edge, and the fixed side mounting plate 24 is disposed on the upper surface of the fixed side frame plate 20 and forms the upper surface of the fixed mold 12.
The fixed-side mold 12 is configured such that these plate members are sequentially stacked and fixed to each other as described above. Further, a nozzle insertion port 24 a for inserting the nozzle N of the injection molding machine is provided on the upper surface of the fixed side mounting plate 24.

固定側枠板２０は、枠状の板材である。この固定側枠板２０と、この固定側枠板２０を上下から挟む固定側受板１８および固定側取付板２４とで構成される空間の中の所定位置には、スペーサ２８および３０等によって所定位置に保持されて、マニホールド３２が配置される。また、公知の射出成形用金型と同様に、マニホールド３２は、溶融樹脂を加熱するためのヒータを内蔵する。
なお、固定側枠板２０には、後述するマニホールド３２を加熱するヒータやホットランナーボディ５８を加熱するヒータの配線、各種のセンサの配線等を取り出すための貫通孔２０ａが設けられる。 The fixed side frame plate 20 is a frame-shaped plate material. A predetermined position in a space formed by the fixed-side frame plate 20 and the fixed-side receiving plate 18 and the fixed-side mounting plate 24 sandwiching the fixed-side frame plate 20 from above and below is predetermined by spacers 28 and 30 and the like. In position, the manifold 32 is placed. Moreover, the manifold 32 contains the heater for heating molten resin similarly to the well-known injection mold.
The fixed-side frame plate 20 is provided with a through hole 20a for taking out a heater wiring for heating the manifold 32 described later, a heater wiring for heating the hot runner body 58, wiring for various sensors, and the like.

本発明の射出整形用金型１０は、このマニホールド３２、ならびに、スペーサ２８および３０以外には、基本的に、公知のホットランナー成形に用いられる射出成形用金型と同じ構成を有する。
マニホールド３２、ならびにスペーサ２８および３０に関しては、後に詳述する。 Except for the manifold 32 and the spacers 28 and 30, the injection molding die 10 of the present invention basically has the same configuration as an injection molding die used for known hot runner molding.
The manifold 32 and the spacers 28 and 30 will be described in detail later.

他方、可動側金型１４は、可動側型板３６および可動側受板３８が積層され、互いに固定されて構成される。 On the other hand, the movable mold 14 is configured by laminating a movable mold plate 36 and a movable receiving plate 38 and fixing them together.

射出成形用金型１０においては、可動側金型１４の可動側型板３６と、固定側金型１２の固定側型板１６との間でキャビティ４０を形成している。図１に示すように、キャビティ４０は、横方向に２箇所、形成される。
キャビティ４０は、成形する光学部品等の製品の形状を有する製品部分４２と、製品部分４２に連通する外郭部分４６とから構成される。
外郭部分４６は、固定側型板１６の下面と可動側型板３６の上面に沿って伸びる凹部とから形成されている。製品部分４２と外郭部分４６との連結部には、可動側型板３６の凹部の底面が一部突出して、外郭部分４６の空間を細くしたゲート４８が形成されている。 In the injection mold 10, a cavity 40 is formed between the movable side mold plate 36 of the movable side mold 14 and the fixed side mold plate 16 of the fixed side mold 12. As shown in FIG. 1, the cavity 40 is formed in two places in the horizontal direction.
The cavity 40 includes a product portion 42 having a shape of a product such as an optical component to be molded, and an outer portion 46 communicating with the product portion 42.
The outer portion 46 is formed of a lower surface of the fixed-side template 16 and a recess extending along the upper surface of the movable-side template 36. At the connecting portion between the product portion 42 and the outer portion 46, a gate 48 is formed in which the bottom surface of the concave portion of the movable side template 36 protrudes and the space of the outer portion 46 is narrowed.

製品部分４２の上面は、固定側型板１６を上下方向に貫通する貫通孔に配置される固定側製品駒５２の下面によって形成され、製品部分４２の下面は、可動側型板３６を上下方向に貫通する貫通孔に配置される可動側製品駒５４によって形成されている。製品部分４２の側面は、固定側型板１６および可動側型板３６の内壁面によって形成されている。
なお、固定側製品駒５２は、固定側受板１８により上面側から固定されると共に、固定側型板１６により下面側および側面側から固定されている。また、可動側製品駒５４は、可動側受板３８により下面側から固定されると共に、可動側型板３６により下面側および側面側から固定されている。 The upper surface of the product portion 42 is formed by the lower surface of the fixed-side product piece 52 disposed in a through-hole penetrating the fixed-side mold plate 16 in the vertical direction, and the lower surface of the product portion 42 moves the movable-side template 36 in the vertical direction. It is formed by the movable-side product piece 54 arranged in the through-hole penetrating through. The side surface of the product portion 42 is formed by the inner wall surfaces of the fixed side mold plate 16 and the movable side mold plate 36.
The fixed product piece 52 is fixed from the upper surface side by the fixed side receiving plate 18 and is fixed from the lower surface side and the side surface side by the fixed side mold plate 16. The movable product piece 54 is fixed from the lower surface side by the movable side receiving plate 38 and is fixed from the lower surface side and the side surface side by the movable side mold plate 36.

各キャビティ４０の外郭部分４６の上側には、固定側型板１６および固定側受板１８に形成された貫通孔に挿入され、固定側枠板２０の内側まで達するように上方に伸びたホットランナー（ＨＲ）ボディ５８が設置されている。
ホットランナーボディ５８は上面から下面まで延びる貫通孔５８ａが形成された筒状の形状を有する。この貫通孔５８ａは、溶融樹脂の流路であり、その下面には供給口５８ｂが形成されている。また、図示は省略するが、ホットランナーボディ５８は、貫通孔５８ａに沿って、上下方向に延在するヒータを内蔵している。 On the upper side of the outer portion 46 of each cavity 40, a hot runner is inserted into a through hole formed in the fixed side mold plate 16 and the fixed side receiving plate 18 and extends upward so as to reach the inside of the fixed side frame plate 20. (HR) Body 58 is installed.
The hot runner body 58 has a cylindrical shape in which a through hole 58a extending from the upper surface to the lower surface is formed. This through hole 58a is a flow path of a molten resin, and a supply port 58b is formed on the lower surface thereof. Moreover, although illustration is abbreviate | omitted, the hot runner body 58 incorporates the heater extended to an up-down direction along the through-hole 58a.

前述のように、固定側枠板２０と、固定側枠板２０を上下から挟む固定側取付板２４と固定側受板１８とによって形成される空間（固定側金型１２の内部空間）には、マニホールド３２が配置される。
マニホールド３２は、マニホールド３２の四隅において、マニホールド３２を上下方向に貫通して固定側受板１８に螺合する、取付ネジ（図示省略）によって、固定側金型１２に取付られる（図３参照）。 As described above, the space formed by the fixed side frame plate 20, the fixed side mounting plate 24 sandwiching the fixed side frame plate 20 from above and below, and the fixed side receiving plate 18 (internal space of the fixed side mold 12) The manifold 32 is disposed.
The manifold 32 is attached to the fixed mold 12 at the four corners of the manifold 32 by mounting screws (not shown) that penetrate the manifold 32 in the vertical direction and are screwed to the fixed receiving plate 18 (see FIG. 3). .

マニホールド３２は、ホットランナーボディ５８の上面と接して配置されている。また、マニホールド３２は、マニホールド３２の上面と固定側取付板２４の下面とに当接するスペーサ２８、および、マニホールド３２の下面と固定側受板１８の上面とに当接するスペーサ３０によって、上下方向を位置決めして保持される。
他方、マニホールド３２の横方向（溶融樹脂の分配方向）の位置は、マニホールド３２を固定側金型１２に取り付けるための取付ネジによって保持される。マニホールド３２は、後述する凸部７２ａ（射出口３２ａ）が固定側取付板２４のノズル挿入口２４ａに挿入され、かつ、前記ホットランナーボディ５８の貫通孔５８ａと後述する供給流路６８とか連通するように、横方向に位置決めされる。 The manifold 32 is disposed in contact with the upper surface of the hot runner body 58. The manifold 32 is moved in the vertical direction by a spacer 28 that contacts the upper surface of the manifold 32 and the lower surface of the fixed side mounting plate 24, and a spacer 30 that contacts the lower surface of the manifold 32 and the upper surface of the fixed side receiving plate 18. Positioned and held.
On the other hand, the position of the manifold 32 in the lateral direction (the direction in which the molten resin is distributed) is held by mounting screws for mounting the manifold 32 to the stationary mold 12. The manifold 32 has a projection 72a (injection port 32a), which will be described later, inserted into the nozzle insertion port 24a of the fixed side mounting plate 24, and communicates with a through hole 58a of the hot runner body 58 and a supply flow path 68, which will be described later. In the lateral direction.

マニホールド３２内には、射出成形機のノズルＮから溶融樹脂を射出される射出口３２ａに連通する射出流路６２、各キャビティ４０（各ホットランナーボディ５８）に溶融樹脂を分配するための分配流路６４、および、ホットランナーボディ５８に溶融樹脂を供給する供給流路６８が形成される。
マニホールド３２の射出流路６２、分配流路６４および供給流路６８、ならびに、ホットランナーボディ５８の貫通孔５８ａによって、射出成形機のノズルＮから溶融樹脂を射出される射出口３２ａから、ホットランナーボディ５８の供給口５８ｂまで連通する溶融樹脂の流路（ランナー）が形成される。
これにより、射出成形機のノズルＮから射出口３２ａに射出された溶融樹脂が、マニホールド３２およびホットランナーボディ５８を通り、供給口５８ｂからキャビティ４０に供給されるように構成されている。 In the manifold 32, a distribution flow for distributing the molten resin to the injection flow path 62 communicating with the injection port 32a through which the molten resin is injected from the nozzle N of the injection molding machine, and to each cavity 40 (each hot runner body 58). A supply channel 68 for supplying molten resin to the channel 64 and the hot runner body 58 is formed.
The hot runner from the injection port 32a through which the molten resin is injected from the nozzle N of the injection molding machine by the injection flow path 62, the distribution flow path 64 and the supply flow path 68 of the manifold 32, and the through hole 58a of the hot runner body 58. A molten resin flow path (runner) communicating with the supply port 58b of the body 58 is formed.
Accordingly, the molten resin injected from the nozzle N of the injection molding machine to the injection port 32a passes through the manifold 32 and the hot runner body 58 and is supplied to the cavity 40 from the supply port 58b.

図２に、マニホールド３２（ならびに、固定側型板１６、固定側受板１８およびホットライナーボディ５８）の概略断面斜視図を示す。
図１および図２に示すように、本発明の射出成形用金型１０において、マニホールド３２は、分割可能な第１部材７２と第２部材７４とを組み合わせて構成される。
また、マニホールド３２は、第１部材７２に形成される半円形の凹部７６ａと、第２部材に形成される半円形の凹部７６ｂとで構成される、貫通孔７６を有する。マニホールド３２においては、この貫通孔７６に、溶融樹脂を加熱するためのヒータ（図示省略）が挿入される。 FIG. 2 shows a schematic cross-sectional perspective view of the manifold 32 (and the fixed side mold plate 16, the fixed side receiving plate 18, and the hot liner body 58).
As shown in FIGS. 1 and 2, in the injection mold 10 of the present invention, the manifold 32 is configured by combining a first member 72 and a second member 74 that can be divided.
Further, the manifold 32 has a through hole 76 constituted by a semicircular recess 76a formed in the first member 72 and a semicircular recess 76b formed in the second member. In the manifold 32, a heater (not shown) for heating the molten resin is inserted into the through hole 76.

なお、図２においては、図面を簡潔にして、マニホールド３２の構成を明瞭に示するために、第１部材７２と第２部材７４とを締結するための締結ネジ（ネジ孔８２および締結ネジを挿通する貫通孔８０）は省略する。マニホールド３２の締結ネジに関しては、後に詳述する。 In FIG. 2, in order to simplify the drawing and clearly show the configuration of the manifold 32, fastening screws (screw holes 82 and fastening screws for fastening the first member 72 and the second member 74 are used. The through-hole 80) to be inserted is omitted. The fastening screw of the manifold 32 will be described in detail later.

第１部材７２および第２部材７４は、略同形状の板状の部材である。
溶融樹脂を複数のキャビティ４０に分配するための分配流路６４は、第１部材７２と第２部材７４とを組み合わせた際に、互いの界面（接合面・対向面）によって形成される。
また、分配流路６４は、第１部材７２および第２部材７４の一方のみを加工することによって形成される。図示例においては、第２部材７４の上面（第１部材７２との界面）に溝を形成することで、分配流路６４を形成している（図３参照）。すなわち、マニホールド３２においては、分配流路６４は、第２部材７４に形成された溝と、第１部材７２の下面（第２部材７４との界面）とによって形成される。 The first member 72 and the second member 74 are plate members having substantially the same shape.
When the first member 72 and the second member 74 are combined, the distribution flow path 64 for distributing the molten resin to the plurality of cavities 40 is formed by the mutual interface (bonding surface / opposing surface).
The distribution channel 64 is formed by processing only one of the first member 72 and the second member 74. In the illustrated example, a distribution channel 64 is formed by forming a groove on the upper surface of the second member 74 (interface with the first member 72) (see FIG. 3). That is, in the manifold 32, the distribution flow path 64 is formed by a groove formed in the second member 74 and the lower surface of the first member 72 (interface with the second member 74).

また、射出流路６２は、第１部材７２を厚さ方向に貫通して穿孔することによって形成される。なお、第１部材７２には、射出成形機のノズルＮを受ける凸部７２ａが形成され、此処に射出口３２ａおよび射出流路６２が形成される。
他方、供給流路６８は、分配流路６４の両端部から、第２部材７４を厚さ方向に貫通して穿孔することによって形成される。 Moreover, the injection flow path 62 is formed by penetrating the first member 72 in the thickness direction. The first member 72 has a convex portion 72a that receives the nozzle N of the injection molding machine, and an injection port 32a and an injection flow path 62 are formed here.
On the other hand, the supply flow path 68 is formed by penetrating the second member 74 from both ends of the distribution flow path 64 in the thickness direction.

本発明は、マニホールド３２を分割可能で、互いの界面で分配流路６４を形成する２つの部材から形成することにより、マニホールド３２内の溶融樹脂流路の確実な洗浄を可能にし、さらに、構造的に溶融樹脂流路のデッドスペースを無くすことができる。そのため、本発明によれば、製品に樹脂ヤケ等が混入することを好適に防止して、高品質な製品を、高い生産性で製造することが可能になる。
また、分配流路６４を一方の部材のみの加工で形成することにより、マニホールド３２の分配流路の加工を容易にできる、流路の洗浄性をより向上できる、洗浄性の向上等によって作業性も向上できる等の効果を得ることができる。さらに、第１部材７２と第２部材７４との位置合わせも、高い精度を要求されず、容易に行うことが可能になる。 In the present invention, the manifold 32 can be divided and formed from two members that form the distribution channel 64 at the interface with each other, so that the molten resin channel in the manifold 32 can be reliably cleaned, and the structure Thus, the dead space of the molten resin flow path can be eliminated. Therefore, according to the present invention, it is possible to suitably prevent resin burns and the like from being mixed into the product, and to manufacture a high-quality product with high productivity.
Further, by forming the distribution flow path 64 by processing only one member, the processing of the distribution flow path of the manifold 32 can be facilitated, the cleaning performance of the flow path can be further improved, and the workability is improved by improving the cleaning performance. The effect that it can improve can also be acquired. Further, the positioning of the first member 72 and the second member 74 is not required to be highly accurate and can be easily performed.

本発明の射出成形用金型において、マニホールド３２を構成する第１部材７２および第２部材７４の厚さを、略同一とするのが好ましい。
このような構成を有することにより、両部材で溶融樹脂の圧力による変形を均等にして、後述する両部材の界面の開きを、より好適に防止できる等の点で好ましい。
なお、本発明において、第１部材７２および第２部材７４の厚さが略同一とは、両者の厚さの差が±２０％以内であることを示す。 In the injection mold according to the present invention, it is preferable that the first member 72 and the second member 74 constituting the manifold 32 have substantially the same thickness.
By having such a configuration, it is preferable in that the deformation due to the pressure of the molten resin is made uniform by both members, and the opening of the interface between both members described later can be more suitably prevented.
In the present invention, the fact that the thicknesses of the first member 72 and the second member 74 are substantially the same means that the difference in thickness between the two is within ± 20%.

本発明において、マニホールド３２を構成する第１部材７２および第２部材７４の厚さには、特に限定はなく、射出成形機からの溶融樹脂の射出圧力、マニホールドの形成材料、射出成形用金型の大きさや構成等に応じて、適宜、決定すればよい。
ここで、射出成形用金型において、マニホールド３２等の部材は、一般的に、ステンレスを焼き入れおよび焼き戻しした材料で形成される。そのため、本発明者の検討によれば、一例として、小型の光学部品などを成形する場合には、第１部材７２および第２部材７４の厚さを１０〜３０ｍｍとすることにより、溶融樹脂の圧力に対して十分な剛性を確保できる、必要以上にマニホールド３２が大きくかつ重くなることを防止できる等の点で好ましい。 In the present invention, the thicknesses of the first member 72 and the second member 74 constituting the manifold 32 are not particularly limited, and the injection pressure of the molten resin from the injection molding machine, the material for forming the manifold, and the mold for injection molding What is necessary is just to determine suitably according to a magnitude | size, a structure, etc. of this.
Here, in the injection mold, members such as the manifold 32 are generally formed of a material obtained by quenching and tempering stainless steel. Therefore, according to the study of the present inventor, as an example, when molding a small optical component or the like, the thickness of the first member 72 and the second member 74 is set to 10 to 30 mm. This is preferable in that sufficient rigidity can be secured against pressure, and the manifold 32 can be prevented from becoming larger and heavier than necessary.

ここで、マニホールド３２を分割可能に構成することにより、前述のような効果が得られる反面、射出成形機から射出される溶融樹脂の圧力によって、第１部材７２と第２部材７４との界面が開いてしまい、溶融樹脂が流路から流出してしまうという問題が有る。
これに対して、本発明の射出成形用金型１０においては、第１部材７２と第２部材７４とを単純に締結ネジで締結するのではなく、スペーサ２８および３０の位置、ならびに、締結ネジによる締結の位置や方向を工夫することによって、より確実に、溶融樹脂の圧力による第１部材７２と第２部材７４との界面の開放を防止している。 Here, the manifold 32 can be divided so that the above-described effects can be obtained. On the other hand, the interface between the first member 72 and the second member 74 is caused by the pressure of the molten resin injected from the injection molding machine. There is a problem that the melted resin flows out of the flow path.
On the other hand, in the injection mold 10 of the present invention, the first member 72 and the second member 74 are not simply fastened with fastening screws, but the positions of the spacers 28 and 30 and the fastening screws. By devising the position and direction of fastening by, the opening of the interface between the first member 72 and the second member 74 due to the pressure of the molten resin is more reliably prevented.

前述のように、マニホールド３２は、スペーサ２８および３０によって、固定側金型１２の内部空間における上下方向（マニホールド３２の分割方向）に対して位置決めして保持される。
スペーサ２８は、マニホールド３２の上面である第１部材７２の上面と固定側取付板２４の下面（前記内部空間の上壁面）とに当接して、マニホールド３２を上下方向の所定位置に保持する。図示例において、スペーサ２８は、分配流路６４の延在方向に、射出流路６２の両側に２個ずつ、計４個が配列されている。
他方、スペーサ３０は、マニホールド３２の下面である第２部材７４の下面と固定側受板１８の上面（前記内部空間の下壁面）とに当接して、マニホールド３２を上下方向の所定位置に保持する。図示例においては、供給流路６８の間で、分配流路６４の延在方向に３個が配置されている。
なお、スペーサ２８および３０は、共に、図示を省略するネジによって、マニホールド３２に固定されている。 As described above, the manifold 32 is positioned and held by the spacers 28 and 30 with respect to the vertical direction (the dividing direction of the manifold 32) in the internal space of the fixed mold 12.
The spacer 28 contacts the upper surface of the first member 72 that is the upper surface of the manifold 32 and the lower surface of the fixed side mounting plate 24 (the upper wall surface of the internal space), and holds the manifold 32 at a predetermined position in the vertical direction. In the illustrated example, a total of four spacers 28 are arranged, two on each side of the injection channel 62 in the extending direction of the distribution channel 64.
On the other hand, the spacer 30 contacts the lower surface of the second member 74, which is the lower surface of the manifold 32, and the upper surface of the stationary side receiving plate 18 (the lower wall surface of the internal space) to hold the manifold 32 in a predetermined position in the vertical direction. To do. In the illustrated example, three supply channels 68 are arranged in the extending direction of the distribution channel 64.
The spacers 28 and 30 are both fixed to the manifold 32 by screws not shown.

ここで、本発明の射出成形用金型１０においては、図２に示すように、スペーサ２８および３０は、共に、マニホールド３２の分配流路６４に対応する位置（分配流路６４の真上および真下）に当接するように配置される。
本発明においては、後述する締結方法に加え、スペーサ２８および３０の位置をこのようにすることにより、より確実に、溶融樹脂の圧力によって第１部材７２と第２部材７４との界面が開くことを防止している。 Here, in the injection mold 10 of the present invention, as shown in FIG. 2, the spacers 28 and 30 are both positioned corresponding to the distribution channel 64 of the manifold 32 (above the distribution channel 64 and above). It is arranged so as to be in contact with (underneath).
In the present invention, in addition to the fastening method described later, the positions of the spacers 28 and 30 are set in this manner, so that the interface between the first member 72 and the second member 74 is more reliably opened by the pressure of the molten resin. Is preventing.

第１部材７２および第２部材７４の界面を開こうとする溶融樹脂の圧力を最も受けるのは、両部材の界面に形成される分配流路６４である。
従って、この分配流路６４に対応して、スペーサ２８および３０を当接して配置することにより、分配流路６４にかかる第１部材７２および第２部材７４の界面を開こうとする圧力を、スペーサ２８および３０と固定側金型１２とによって、直接的に抑えることができる。そのため、本発明によれば、マニホールド３２を分割可能にした構成において、第１部材７２と第２部材７４との界面が開くことを、より確実に防止できる。 The distribution channel 64 formed at the interface between the two members receives the pressure of the molten resin most likely to open the interface between the first member 72 and the second member 74.
Accordingly, the pressure for opening the interface between the first member 72 and the second member 74 applied to the distribution flow path 64 by arranging the spacers 28 and 30 in contact with the distribution flow path 64 is as follows. The spacers 28 and 30 and the fixed-side mold 12 can be directly suppressed. Therefore, according to the present invention, it is possible to more reliably prevent the interface between the first member 72 and the second member 74 from opening in the configuration in which the manifold 32 can be divided.

図示例においては、好ましい態様として、マニホールド３２（第２部材７４）の下面と固定側受板１８の上面との間では、射出流路６２（溶融樹脂の流入部）に対応する位置に、スペーサ３０を配置する。
射出流路６２は、射出成形機から射出される溶融樹脂の圧力を、直接的に受ける。そのため、分配流路６４の射出流路６２に対応する位置は、他の領域に比して大きな圧力を受ける。
これに対して、射出流路６２に対応する位置に、スペーサ３０を配置することにより、この位置にかかる圧力を、スペーサ３０と固定側金型１２とによって、直接的に抑えることができる。その結果、射出流路６２に対応する位置にスペーサ３０を配置することにより、第１部材７２と第２部材７４との界面が開くことを、より確実に防止できる。 In the illustrated example, as a preferred mode, a spacer is provided between the lower surface of the manifold 32 (second member 74) and the upper surface of the fixed side receiving plate 18 at a position corresponding to the injection flow path 62 (melted resin inflow portion). 30 is arranged.
The injection flow path 62 directly receives the pressure of the molten resin injected from the injection molding machine. Therefore, the position corresponding to the injection flow path 62 of the distribution flow path 64 receives a larger pressure than other regions.
On the other hand, by placing the spacer 30 at a position corresponding to the injection flow path 62, the pressure applied to this position can be directly suppressed by the spacer 30 and the fixed-side mold 12. As a result, by disposing the spacer 30 at a position corresponding to the injection flow path 62, it is possible to more reliably prevent the interface between the first member 72 and the second member 74 from opening.

さらに、図示例においては、好ましい態様として、マニホールド３２（第１部材７２）の上面と固定側取付板２４の下面との間では、供給流路６８（溶融樹脂の流出部）に対応する位置に、スペーサ２８を配置する。
分配流路６４と供給流路６８との接続位置では、溶融樹脂の流れの方向が大きく変化する。そのため、分配流路６４の射出流路６２に対応する位置は、他の領域に比して大きな圧力を受ける。
これに対して、供給流路６８に対応する位置に、スペーサ２８を配置することにより、この位置にかかる圧力を、スペーサ２８と固定側取付板２４とによって、直接的に抑えることができる。その結果、供給流路６８に対応する位置に、スペーサ２８を配置することにより、第１部材７２と第２部材７４との界面が開くことを、より確実に防止できる。 Furthermore, in the illustrated example, as a preferred mode, a position corresponding to the supply flow path 68 (outflow portion of the molten resin) is provided between the upper surface of the manifold 32 (first member 72) and the lower surface of the fixed side mounting plate 24. The spacer 28 is disposed.
At the connection position between the distribution flow path 64 and the supply flow path 68, the flow direction of the molten resin changes greatly. Therefore, the position corresponding to the injection flow path 62 of the distribution flow path 64 receives a larger pressure than other regions.
On the other hand, by arranging the spacer 28 at a position corresponding to the supply flow path 68, the pressure applied to this position can be directly suppressed by the spacer 28 and the fixed side mounting plate 24. As a result, by disposing the spacer 28 at a position corresponding to the supply flow path 68, the interface between the first member 72 and the second member 74 can be prevented more reliably.

なお、分配流路６４に対応して配置するスペーサ２８および３０の数には、特に限定はなく、分配流路６４の長さ等に応じて、適宜、設定すればよい。
また、本発明において、スペーサ２８および３０は、例えば図２にスペーサ２８ａで示すように、分配流路６４に対応する位置以外にも、適宜、配置してもよい。 The number of the spacers 28 and 30 arranged corresponding to the distribution flow path 64 is not particularly limited, and may be set as appropriate according to the length of the distribution flow path 64 and the like.
In the present invention, the spacers 28 and 30 may be appropriately disposed in addition to the position corresponding to the distribution flow path 64 as indicated by the spacer 28a in FIG.

また、本発明の射出成形用金型１０においては、マニホールド３２を構成する第１部材７２および第２部材７４の締結を、第１部材７２および第２部材７４の双方向から、締結ネジを用いて行う。
ここで、本発明においては、分配流路６４の延在方向に連続して行う締結ネジによる締結を領域を有するのが好ましく、かつ、この分配流路６４の延在方向に連続する領域において、締結ネジによって第１部材７２および第２部材７４の双方向からの締結を行うのが好ましい。その中でも、分配流路６４の延在方向に連続する領域において、第１部材７２からの締結と第２部材７４からの締結とを交互に行う領域を有するのが、好ましい。
さらに、本発明においては、締結ネジによる締結を、分配流路６４と平行に行う領域を有するのが、より好ましく、かつ、この平行な領域において、締結ネジによって第１部材７２および第２部材７４の双方向からの締結を行うのが、さらに好ましい。その中でも、図示例のように、この分配流路６４と平行な締結領域において、第１部材７２からの締結と第２部材７４からの締結とを交互に行う領域を有するのが、特に好ましい。 In the injection molding die 10 of the present invention, the first member 72 and the second member 74 constituting the manifold 32 are fastened from both sides of the first member 72 and the second member 74 by using fastening screws. Do it.
Here, in the present invention, it is preferable to have a region for fastening by a fastening screw continuously performed in the extending direction of the distribution flow path 64, and in a region continuous in the extending direction of the distribution flow path 64, It is preferable to fasten the first member 72 and the second member 74 in both directions with a fastening screw. Among these, it is preferable to have a region in which fastening from the first member 72 and fastening from the second member 74 are alternately performed in a region continuous in the extending direction of the distribution flow path 64.
Furthermore, in the present invention, it is more preferable to have a region where the fastening with the fastening screw is performed in parallel with the distribution flow path 64, and in the parallel region, the first member 72 and the second member 74 are provided with the fastening screw. It is more preferable to perform fastening from both directions. Among them, it is particularly preferable to have a region in which fastening from the first member 72 and fastening from the second member 74 are alternately performed in a fastening region parallel to the distribution flow path 64 as shown in the illustrated example.

図３（Ａ）に、第１部材７２の上面（第２部材７４との界面の逆面）を、図３（Ｂ）に、第２部材７４の上面（第１部材７２との界面）を、それぞれ概念的に示す。
前述のように、マニホールド３２の分配流路６４は、第２部材７４のみを加工して形成される。また、分配流路６４の両端部には、第２部材７４を上下方向に貫通して、供給流路６８が形成される。さらに、第１部材には、凸部７２ａの射出口３２ａから第１部材７２を上下方向に貫通して、射出流路６２が形成される。
さらに、第２部材７４の上面には、分配流路６４を短手方向に挟んで、ヒータを挿入する貫通孔７６を形成するための半円形の凹部７６ｂが形成される。第１部材７２の下面にも、同様に貫通孔７６を形成するための半円形の７６ａが形成される（図２参照）。 3A shows the upper surface of the first member 72 (the reverse surface of the interface with the second member 74), and FIG. 3B shows the upper surface of the second member 74 (the interface with the first member 72). Each is shown conceptually.
As described above, the distribution flow path 64 of the manifold 32 is formed by processing only the second member 74. In addition, a supply channel 68 is formed at both ends of the distribution channel 64 through the second member 74 in the vertical direction. Further, an injection flow path 62 is formed in the first member through the first member 72 in the vertical direction from the injection port 32a of the convex portion 72a.
Furthermore, on the upper surface of the second member 74, a semicircular recess 76b is formed for forming a through hole 76 into which the heater is inserted with the distribution channel 64 sandwiched in the short direction. Similarly, a semicircular 76a for forming the through hole 76 is also formed on the lower surface of the first member 72 (see FIG. 2).

図３（Ａ）に示すように、第１部材７２には、第１部材７２と第２部材７４とを締結する締結ネジを挿入するための貫通孔８０、および、第１部材７２と第２部材７４とを締結する締結ネジが螺合するネジ孔８２が形成される。
また、図３（Ｂ）に示すように、第２部材７４には、前記ネジ孔８２に対応する位置に、第１部材７２と第２部材７４とを締結する締結ネジを挿入するための貫通孔８４が形成され、前記貫通孔８０に対応して、第１部材７２と第２部材７４とを締結する締結ネジが螺合するネジ孔８６が形成される。 As shown in FIG. 3A, the first member 72 has a through hole 80 for inserting a fastening screw for fastening the first member 72 and the second member 74, and the first member 72 and the second member 72. A screw hole 82 into which a fastening screw for fastening the member 74 is screwed is formed.
Further, as shown in FIG. 3B, the second member 74 is penetrated to insert a fastening screw for fastening the first member 72 and the second member 74 at a position corresponding to the screw hole 82. A hole 84 is formed, and a screw hole 86 into which a fastening screw that fastens the first member 72 and the second member 74 is screwed is formed corresponding to the through hole 80.

すなわち、第１部材７２の貫通孔８０および第２部材７４のネジ孔８６は、第１部材７２側から、締結ネジによって第１部材７２と第２部材７４を締結するためのものである。
他方、第１部材７２のネジ孔８２および第２部材７４の貫通孔８４は、第２部材７４側から、締結ネジによって第１部材７２と第２部材７４を締結するためのものである。
なお、以下の説明においては、必要な場合を除いて、貫通孔８０およびネジ孔８６は、貫通孔８０を代表に、ネジ孔８２および貫通孔８４は、ネジ孔８２を代表に、それぞれ説明する。 That is, the through-hole 80 of the first member 72 and the screw hole 86 of the second member 74 are for fastening the first member 72 and the second member 74 from the first member 72 side with fastening screws.
On the other hand, the screw hole 82 of the first member 72 and the through hole 84 of the second member 74 are for fastening the first member 72 and the second member 74 with fastening screws from the second member 74 side.
In the following description, unless otherwise required, the through hole 80 and the screw hole 86 will be described using the through hole 80 as a representative, and the screw hole 82 and the through hole 84 will be described using the screw hole 82 as a representative. .

貫通孔８０およびネジ孔８２は、分配流路６４にかかる溶融樹脂の圧力で、第１部材７２と第２部材７４との界面が開放して、分配流路６４から溶融樹脂が漏れるのを防止するために、分配流路６４の近傍で締結を行う締結ネジに対応するものである。
図示例において、貫通孔８０およびネジ孔８２は、共に、分配流路６４を短手方向に挟んで、分配流路６４と平行に配列される。具体的には、分配流路６４と平行な直線上に、射出流路６２を中心とした外側に向かって、ネジ孔８２と貫通孔８０とが、交互に配置される。また、図示例においては、分配流路６４と平行な１つの直線上に、ネジ孔８２と貫通孔８０とが４個ずつ設けられる。 The through hole 80 and the screw hole 82 prevent the molten resin from leaking from the distribution channel 64 by opening the interface between the first member 72 and the second member 74 due to the pressure of the molten resin applied to the distribution channel 64. Therefore, it corresponds to a fastening screw for fastening in the vicinity of the distribution flow path 64.
In the illustrated example, both the through hole 80 and the screw hole 82 are arranged in parallel with the distribution channel 64 with the distribution channel 64 sandwiched in the short direction. Specifically, the screw holes 82 and the through holes 80 are alternately arranged on a straight line parallel to the distribution flow path 64 toward the outside centering on the injection flow path 62. In the illustrated example, four screw holes 82 and four through holes 80 are provided on one straight line parallel to the distribution flow path 64.

なお、図３において、第１部材７２の四隅近傍に形成される貫通孔９０、および、この貫通孔９０に対応して第２部材７４の四隅近傍に設けられる貫通孔９２は、前述のマニホールド３２を固定側金型１２に取り付けるための取付ネジを挿通するためのものである。
また、第１部材７２において、貫通孔９０の間で分配流路６４の延在方向に配列される４つの貫通孔９４、および、第２部材７４において、この貫通孔９４に対応して形成されるネジ孔９６は、マニホールド３２の外周部において第１部材７２と第２部材７４とを締結する締結ネジに対応するものである。
さらに、図３（Ａ）において、貫通孔８０、９０および９４が二重になっているのは、ザグリ孔を有するためである。 In FIG. 3, the through holes 90 formed in the vicinity of the four corners of the first member 72 and the through holes 92 provided in the vicinity of the four corners of the second member 74 corresponding to the through holes 90 are the manifold 32 described above. This is for inserting an attachment screw for attaching to the fixed mold 12.
Further, in the first member 72, four through holes 94 arranged in the extending direction of the distribution flow path 64 between the through holes 90 and the second member 74 are formed corresponding to the through holes 94. The screw hole 96 corresponds to a fastening screw that fastens the first member 72 and the second member 74 at the outer peripheral portion of the manifold 32.
Further, in FIG. 3A, the through holes 80, 90, and 94 are doubled because they have counterbore holes.

本発明の射出成形用金型１０においては、マニホールド３２を構成する第１部材７２と第２部材７４との締結を、第１部材７２および第２部材７４の双方向から行うことにより、両部材からの引き付け力を発生することで、一方からの締結を行う場合に比して、よりバランス良く強い締結を行うことができる。その結果、前記スペーサ２８および３０との相乗効果によって、より確実に第１部材７２と第２部材７４との界面が開くことを防止できる。
特に、図示例のように、分配流路６４と平行な直線上において、第１部材７２側からの締結と、第２部材側からの締結とを交互に行う領域を有することにより、上記第１部材７２と第２部材７４との界面が開くことの防止効果を、より好適に得ることができる。 In the injection molding die 10 of the present invention, the first member 72 and the second member 74 constituting the manifold 32 are fastened from both sides of the first member 72 and the second member 74, whereby both members By generating the attraction force from the side, it is possible to perform strong fastening with a better balance than when fastening from one side. As a result, the interface between the first member 72 and the second member 74 can be more reliably prevented from opening due to the synergistic effect with the spacers 28 and 30.
In particular, as in the illustrated example, the first first member 72 has a region in which fastening from the first member 72 side and fastening from the second member side are alternately performed on a straight line parallel to the distribution flow path 64. The effect of preventing the interface between the member 72 and the second member 74 from opening can be obtained more suitably.

本発明において、分配流路６４からの溶融樹脂の漏れを防止するための、分配流路６４近傍での締結の位置には、特に限定はない。
しかしながら、締結位置と分配流路６４とが遠すぎると、分配流路６４の近傍において溶融樹脂の漏れを防止するのに十分な締結力が得られない場合がある。一方で、締結位置と分配流路６４の距離は、近い方が締結力という点では有利であるが、近すぎると、逆に締結される間隔（締結に供される面）が近すぎて締結力が弱くなり、また、機械的強度にも問題が生じる可能性が有る。 In the present invention, the fastening position in the vicinity of the distribution flow path 64 for preventing leakage of the molten resin from the distribution flow path 64 is not particularly limited.
However, if the fastening position and the distribution flow path 64 are too far, a fastening force sufficient to prevent the molten resin from leaking in the vicinity of the distribution flow path 64 may not be obtained. On the other hand, a closer distance between the fastening position and the distribution flow path 64 is advantageous in terms of fastening force. However, if the distance is too close, the fastening interval (surface used for fastening) is too close and fastening is performed. The force may be weakened and the mechanical strength may also be problematic.

以上の点を考慮すると、分配流路６４近傍での締結ネジによる第１部材７２と第２部材７４との締結は、図３（Ｃ）に示すように、ネジ孔８６（８２）と分配流路６４との距離［ｄ］と、分配流路６４の幅ｈとが、下記式
ｄ＝ａ×ｈ（ａは、２〜３）
を満たすように行うのが好ましい。
これにより、より確実かつ強固な第１部材７２と第２部材７４との締結を行って、圧力によって第１部材７２と第２部材７４との界面が開いて溶融樹脂が漏れることを、より好適に防止できる。 Considering the above points, the fastening of the first member 72 and the second member 74 by the fastening screw in the vicinity of the distribution flow path 64 is performed as shown in FIG. 3 (C) with the screw hole 86 (82) and the distribution flow. The distance [d] to the channel 64 and the width h of the distribution channel 64 are expressed by the following formula: d = a × h (a is 2 to 3)
It is preferable to perform so as to satisfy.
Accordingly, it is more preferable that the first member 72 and the second member 74 are more securely and firmly fastened and the interface between the first member 72 and the second member 74 is opened by the pressure and the molten resin leaks. Can be prevented.

また、分配流路６４の近傍での締結ネジによる第１部材７２と第２部材７４との締結は、射出流路６２を均等に囲むように行うのが好ましい。言い換えれば、第１部材７２と第２部材７４との締結は、射出口３２ａを中心とする円上で、均一な間隔（回転角）で行うのが好ましい。
前述のように、射出流路６２すなわち溶融樹脂の流入部は、流路の他の部分に比して、大きな力が掛かり、両部材の界面が開き易い。これに対して、例えば、図３に示すように、第１部材７２と第２部材７４との締結を射出流路６２を均等に囲む４箇所で行うことにより、樹脂の射出による圧力が大きな部分を確実に締結して、両部材の界面が開くことを、より好適に防止できる。 Further, it is preferable that the first member 72 and the second member 74 are fastened by fastening screws in the vicinity of the distribution flow path 64 so as to surround the injection flow path 62 evenly. In other words, the first member 72 and the second member 74 are preferably fastened at a uniform interval (rotation angle) on a circle centering on the injection port 32a.
As described above, the injection flow path 62, that is, the molten resin inflow portion, is subjected to a larger force than the other portions of the flow path, and the interface between both members is likely to open. On the other hand, for example, as shown in FIG. 3, the first member 72 and the second member 74 are fastened at four locations evenly surrounding the injection flow path 62, thereby increasing the pressure due to the injection of the resin. It is possible to more preferably prevent the interface between the two members from being securely opened.

ここで、射出流路６２を囲む締結は、射出流路６２に近い位置で行った方が、第１部材７２と第２部材７４との界面の開き防止効果は大きい。
しかしながら、射出口３２ａが形成される第１部材７２には、射出成形機のノズルＮを受けるために、凸部７２ａが形成される。また、特許文献１や特許文献２にも示されるように、マニホールドの射出成形機から溶融樹脂を射出される位置には、射出成形機のノズルを受けるための部材が取り付けられる。
そのため、射出流路６２を囲む締結を、射出流路６２が形成された第１部材７２側から行うと、締結位置が射出流路６２から離れてしまう。これに対し、図示例のように、射出流路６２を囲む締結を、射出流路６２が形成されていない第２部材７４側から行うと、結位置を射出流路６２に近くでき、より、高い締結力が得られる。 Here, when the fastening surrounding the injection flow path 62 is performed at a position close to the injection flow path 62, the effect of preventing the opening of the interface between the first member 72 and the second member 74 is greater.
However, in order to receive the nozzle N of the injection molding machine, a convex portion 72a is formed on the first member 72 where the injection port 32a is formed. Also, as shown in Patent Document 1 and Patent Document 2, a member for receiving the nozzle of the injection molding machine is attached to a position where the molten resin is injected from the injection molding machine of the manifold.
For this reason, when the fastening surrounding the injection flow path 62 is performed from the first member 72 side where the injection flow path 62 is formed, the fastening position is separated from the injection flow path 62. On the other hand, if the fastening surrounding the injection flow path 62 is performed from the second member 74 side where the injection flow path 62 is not formed as shown in the example, the connection position can be close to the injection flow path 62. High fastening force can be obtained.

さらに、図示例のように、この射出流路６２を囲む締結から、分配流路６４の長手方向外側に向けて、第１部材７２側からの締結と、第２部材側からの締結とを交互に行う構成とすることにより、より強力な締結を行うことができる。 Further, as in the illustrated example, the fastening from the first member 72 side and the fastening from the second member side are alternately performed from the fastening surrounding the injection flow path 62 toward the outside in the longitudinal direction of the distribution flow path 64. By adopting a configuration that is performed in the above, stronger fastening can be performed.

なお、第１部材７２と第２部材７４との界面の開放を防止するための分配流路６４の近傍での締結ネジによる締結数や、締結の間隔には、特に限定はなく、分配流路６４の長さ等に応じて、適宜、設定すればよい。
また、第１部材７２と第２部材７４との界面の開放を防止するための締結は、上述の位置以外にも、必要に応じて、各種の位置が利用可能である。一例として、分配流路６４の近傍（好ましくは、前記式を満たす位置）で、かつ、分配流路６４を長手方向に挟む位置で、締結ネジによる締結を行うようにしてもよい。 There are no particular restrictions on the number of fastenings by fastening screws in the vicinity of the distribution flow path 64 for preventing the opening of the interface between the first member 72 and the second member 74, and the interval between the fastenings. What is necessary is just to set suitably according to the length of 64.
In addition to the above-described positions, various positions can be used for fastening for preventing the opening of the interface between the first member 72 and the second member 74 as necessary. As an example, fastening with a fastening screw may be performed in the vicinity of the distribution flow path 64 (preferably, a position satisfying the above expression) and at a position sandwiching the distribution flow path 64 in the longitudinal direction.

以下、射出成形用金型１０の作用を説明する。
まず、固定側金型１２に対して可動側金型１４を閉じ、固定側金型１２と可動側金型１４との間に外郭部分４６および製品部分４２からなるキャビティ４０を形成する。さらに、ホットランナーボディ５８およびマニホールド３２のヒータを駆動する。 Hereinafter, the operation of the injection mold 10 will be described.
First, the movable mold 14 is closed with respect to the fixed mold 12, and the cavity 40 including the outer portion 46 and the product portion 42 is formed between the fixed mold 12 and the movable mold 14. Further, the heaters of the hot runner body 58 and the manifold 32 are driven.

次に、固定側金型１２の固定側取付板２４に形成されたノズル挿入口２４ａに射出成形機のノズルＮが挿入され、射出成形機のノズルＮからマニホールド３２の射出口３２ａに溶融樹脂が射出される。
射出された溶融樹脂は、マニホールド３２の射出流路６２、分配流路６４および供給流路６８を通って、ホットランナーボディ５８の貫通孔５８ａに供給される。
ホットランナーボディ５８の貫通孔５８ａに供給された溶融樹脂は、ホットランナーボディ５８の供給口５８ｂからキャビティ４０に充填される。続いて、キャビティ４０に充填された溶融樹脂は、固化される。 Next, the nozzle N of the injection molding machine is inserted into the nozzle insertion port 24a formed in the fixed side mounting plate 24 of the fixed side mold 12, and molten resin is injected from the nozzle N of the injection molding machine to the injection port 32a of the manifold 32. It is injected.
The injected molten resin is supplied to the through hole 58 a of the hot runner body 58 through the injection flow path 62, the distribution flow path 64 and the supply flow path 68 of the manifold 32.
The molten resin supplied to the through hole 58 a of the hot runner body 58 is filled into the cavity 40 from the supply port 58 b of the hot runner body 58. Subsequently, the molten resin filled in the cavity 40 is solidified.

ここで、本発明の射出成形用金型１０においては、マニホールド３２は、分割可能な第１部材７２と第２部材７４とから構成されている。
これに対して、マニホールド３２は、スペーサ２８および３０によって、分配流路６４に対応する位置で、上下方向（分割方向）に保持され、さらに、第１部材７２と第２部材７４との双方向から、好ましくは交互に締結されている。そのため、溶融樹脂の圧力によって、第１部材７２と第２部材７４との界面が開いて、溶融樹脂が流れ出すことを防止できる。
また、マニホールド３２は、分割可能な第１部材７２と第２部材７４とから構成されているので、流路の洗浄を確実に行え、かつ、デッドスペースも無くせるので、樹脂ヤケ等の混入による製品品質の劣化等が無く、高い生産効率を確保できる。 Here, in the injection mold 10 of the present invention, the manifold 32 includes a first member 72 and a second member 74 that can be divided.
On the other hand, the manifold 32 is held by the spacers 28 and 30 in the vertical direction (division direction) at a position corresponding to the distribution flow path 64, and further, bidirectional between the first member 72 and the second member 74. From the above, it is preferably fastened alternately. Therefore, it is possible to prevent the molten resin from flowing out by opening the interface between the first member 72 and the second member 74 due to the pressure of the molten resin.
Further, since the manifold 32 is composed of a first member 72 and a second member 74 that can be divided, the flow path can be reliably washed and a dead space can be eliminated. There is no degradation of product quality, and high production efficiency can be secured.

キャビティ４０の溶融樹脂が固化して成形品が成形されると、可動側金型１４が開かれ、成形品が取り出される。 When the molten resin in the cavity 40 is solidified to form a molded product, the movable side mold 14 is opened and the molded product is taken out.

以上、本発明の射出成形用金型について詳細に説明したが、本発明は、上記実施例に限定はされず、本発明の要旨を逸脱しない範囲において、各種の変更や改良を行ってもよいのは、もちろんである。 As mentioned above, although the injection mold of the present invention has been described in detail, the present invention is not limited to the above-described embodiments, and various changes and improvements may be made without departing from the gist of the present invention. Of course.

１０，１００射出成形用金型
１２，１０２固定側金型
１４，１０４可動側金型
１６固定側型板
１８固定側受板
２０固定側枠板
２４固定側取付板
２８，３０スペーサ
３２，１０４マニホールド
３６可動側型板
３８可動側受板
４０キャビティ
４２製品部分
４６外郭部分
４８ゲート
５２固定側製品駒
５４可動側製品駒
５８，１０６ホットランナーボディ
６２射出流路
６４分配流路
６８供給流路
７２第１部材
７４第２部材
７６，８０，８４、９０、９４貫通孔
８２，８６、９２ネジ孔 DESCRIPTION OF SYMBOLS 10,100 Injection mold 12,102 Fixed side mold 14,104 Movable side mold 16 Fixed side mold plate 18 Fixed side receiving plate 20 Fixed side frame plate 24 Fixed side mounting plate 28, 30 Spacer 32, 104 Manifold 36 movable side template 38 movable side receiving plate 40 cavity 42 product part 46 outer part 48 gate 52 fixed side product piece 54 movable side product piece 58, 106 hot runner body 62 injection flow path 64 distribution flow path 68 supply flow path 72 second 1 member 74 2nd member 76, 80, 84, 90, 94 Through hole 82, 86, 92 Screw hole

Claims

A fixed mold having an internal space through which the flow path of the molten resin passes,
A movable mold that is movable to be openable and closable with respect to the fixed mold, and that forms a plurality of cavities communicating with the flow path together with the fixed mold;
A manifold having a distribution flow path for distributing molten resin to the plurality of cavities, disposed in an internal space of the fixed mold,
The manifold has a first member and a second member that can be divided to form the distribution flow path at the interface with each other, and the distribution flow channel is only one of the first member and the second member. Formed by processing, and the first member and the second member are fastened with a fastening screw from both directions,
In addition, in the dividing direction of the first member and the second member, there is a spacer that contacts the outer surface of the manifold and the inner space wall surface of the fixed mold to hold the manifold at a predetermined position in the inner space. And this spacer abuts at a position corresponding to the distribution flow path of the manifold ,
Further, when the first member and the second member are fastened by the fastening screw, the distance [d] between the distribution flow path and the screw hole and the width [h] of the distribution flow path are expressed by the following formulas:
d = a × h (a is 2 to 3)
An injection mold characterized by being performed so as to satisfy.

A fixed mold having an internal space through which the flow path of the molten resin passes,
A movable mold that is movable to be openable and closable with respect to the fixed mold, and that forms a plurality of cavities communicating with the flow path together with the fixed mold;
A manifold having a distribution flow path for distributing molten resin to the plurality of cavities, disposed in an internal space of the fixed mold,
The manifold has a first member and a second member that can be divided to form the distribution flow path at the interface with each other, and the distribution flow channel is only one of the first member and the second member. Formed by processing, and the first member and the second member are fastened with a fastening screw from both directions,
In addition, in the dividing direction of the first member and the second member, there is a spacer that contacts the outer surface of the manifold and the inner space wall surface of the fixed mold to hold the manifold at a predetermined position in the inner space. And this spacer abuts at a position corresponding to the distribution flow path of the manifold ,
Further, in the manifold, the fastening from one member is performed so as to uniformly surround the inflow portion of the molten resin, and from the fastening position surrounding the inflow portion toward the extending direction of the distribution channel. The injection mold is characterized in that fastening from the first member and fastening from the second member are alternately performed.

The manifold has a region in which the fastening by the fastening screw is performed in parallel with the distribution channel, and the first member and the second member are bidirectional from each other in the fastening in parallel with the distribution channel. The injection mold according to claim 1, wherein the mold is fastened.

In the manifold, the fastening by the fastening screw has a region that continues in the extending direction of the distribution flow path, and in the region that continues in the extending direction of the distribution flow path, The injection mold according to any one of claims 1 to 3, further comprising regions where fastening from two members is alternately performed.

The injection mold according to any one of claims 1 to 4, wherein the first member and the second member have substantially the same thickness in the dividing direction.

The injection mold according to any one of claims 1 to 5, wherein a thickness of the first member and the second member in a dividing direction is 10 to 30 mm.

The injection mold according to any one of claims 1 to 6 , wherein the spacer is disposed in contact with a position corresponding to a distribution flow path of the manifold, corresponding to a molten resin inflow portion of the manifold.

The mold for injection molding according to any one of claims 1 to 7 , wherein the spacer is disposed in contact with a position corresponding to a distribution flow path of the manifold, corresponding to an outflow portion of the molten resin from the manifold. .