JP2004034398A - Method for manufacturing centrifugal fan, mold for injection-molding centrifugal fan, and centrifugal fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the catching of a molding by a gate mold and the breakage of the molding by making the molding surely follow a protruding mold. <P>SOLUTION: A mold for injection-molding a centrifugal fan has a gate mold and a protruding mold, is fitted with a thickness reducing piece, and molds a hollow blade. A reverse gradient is formed in the hollow blade peripheral molding surface of the protruding mold so that the hollow blade is left in the protruding mold when a mold is opened. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、空気調和機等の送風機に使用される遠心ファンの製造方法に関するものである。
【０００２】
【従来の技術】
図６〜８は従来の技術を示す図で、図６は従来の遠心ファンの完成図とスライド作動方向を示す図、図７は従来の遠心ファンの中空羽根形状金型構造断面図と動作図、図８は従来の金型の基本動作図である。従来の遠心ファンの中空羽根形状金型に肉盗み駒５ａを設けて羽根形状４ａを形状高さ方向で貫通させた中空状態にして薄肉、軽量化を図る射出成形金型構造に関しては、遠心ファン本体２と羽根形状４ａの一体成形品の羽根形状４ａに肉盗み駒５ａを設けることにより、射出後、冷却工程で樹脂の収縮により、樹脂が肉盗み駒５ａに抱きつき、型開き時に（成形品取出面が開く）成形品がゲート金型側１０についていく（本来、成形品は突出金型側１１についてこないと、突出し離型できない。）。また、射出時、射出圧力により肉盗み駒５ａが倒れ、成形できなくなるという問題が発生する。
【０００３】
そこで、ゲート金型１０へのとられ対策として、突出金型１１側の羽根形状４ａ外周面に０°からアンダーカットになる逆向き勾配をつける為に、羽根形状４ａ面外側に外スライドコア７ａを設け、肉盗み駒５ａの表面は鏡面に仕上げ、冷却による放熱を考慮して密着しないようにすることで、突出金型１１へ成形品が残るようにした。
【０００４】
更に、肉盗み駒５ａは厚み寸法が薄いのでその倒れ対策として、肉盗み駒５ａ先端に凹み形状を設け、それに突出金型１１側羽根形状４ａの先端（吸い込み口１との溶着形状部付近）から飛出た、先端に駒支え用の凸形状を設けた肉盗み駒支え駒６を合わせてゲート金型１０側を支えると共に、ピンゲート９位置は羽根形状４ａの長手方向先端根元から樹脂が入り、羽根形状４ａと肉盗み駒５ａに沿って流れるようにして、射出圧力による肉盗み駒５ａ倒れを防止するようにして重量が軽く、ヒケの発生が押さえられた高品質な遠心ファンの成形が可能になった。羽根形状４ａ表面上にヒケが発生すると所定形状が出ない為、製品性能に影響がある。
【０００５】
しかし、現状の対策であるとゲート金型側へのとられがあり完全な対策とはいえない。その原因は突出金型１１側羽根形状４ａの外周外面スライドコアには逆側に勾配を付けているが、羽根形状４ａの外周内面には逆勾配を設けてなかった為に、型開き時にゲート金型１０側と突出金型１１側のバランスが悪く肉盗み駒５ａ内面へのだきつきが羽根形状４ａ突出金型側の内面よりも大きいので、羽根形状４ａ内面がゲート金型１０側にとられ、外面が突出金型１１側にとられる為に、お互いに引っ張り合う形となり成形品が割れるという問題があり連続成形が困難である。
【０００６】
次に動作について図８を用いて説明する。まず、ゲート金型取付板１３のゲート口から樹脂が注入されて遠心ファン成形品が完成する。その後、ゲート金型取付板１３が成形機に固定された状態でランナーストリッパプレート１２とゲート金型１０の間が開き、ランナー（成形品までの湯道）とピンゲート９（成形品と湯道をつなぐ入り口）を成形品から切り離す。ランナー、ゲート部は後で取り出す。
【０００７】
その後、ゲート金型取付板１３とランナーストリッパプレート１２の間が開きランナー等を確実にランナーストリッパプレート１２側に持ってくることでピンゲート９を成形品から切り離す役割のランナーロックピン１９からランナーが離される。このランナーロックピン１９のランナーに入り込んでいる形状にはアンダーカット形状がついているので、ランナーストリッパプレート１２側へ持ってくることが可能である。
【０００８】
そして、最後に突出金型１１側が動きゲート金型１０面と突出金型１１面が開き、成形品は突出金型１１側に付いてくる。この時、羽根形状４ａが肉盗み駒５ａに抱き付きゲート金型１０へ残った状態で、突出金型１１へ成形品が引っ張られると羽根形状根元付近で突出金型１１とゲート金型１０でお互いに引っ張られて割れる。
【０００９】
以上の型開きが完全に終了後、外スライドコア７ａが動きアンダーカット羽根形状面がはずれる。その後、成形機から突出バー１７が押し出され、エジェクタプレート１５が動き、突出ピン１８によって成形品が押し出されて取り出される。後、ゲート金型１０と突出金型１１等のプレートが動いて締まり、樹脂注入前の状態に戻り、再び以上説明した動作を繰り返す。
【００１０】
【発明が解決しようとする課題】
従来の遠心ファン金型は以上のように構成されているので、羽根形状４ａ内側面もバランス良くゲート金型１０の肉盗み駒５ａが引き抜かれて、型開き時に肉盗み駒５ａにとられる事無く、突出金型１１側へ付かせる必要がある。また、現状は肉盗み駒５ａに成形品の羽根形状４ａが樹脂の収縮により抱きついて、型開き時に外側羽根形状４ａ面はアンダーカット形状であるスライドコア７ａにより突出金型１１に付いてくるが、羽根形状４ａ内側は肉盗み駒５ａにとられてお互いにゲート金型１０と突出金型１１が引っ張り合い割れるという問題点があった。
【００１１】
この発明は上記のような問題点を解消する為になされたもので、成形品のゲート金型側へのとられをなくし、確実に突出金型側に成形品が付いてくる構造にすることで成形品の割れをなくすことを目的としており、更に成形品のゲート金型側へのとられによる割れをなくすことで、連続成形を可能にすることを目的とする。
【００１２】
【課題を解決するための手段】
この発明に係る遠心ファンの射出成形金型は、ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの射出成形金型において、突出金型の中空羽根外周成形面に、型開き時に中空羽根が突出金型に残るような逆勾配を設けたことを特徴とする。
【００１３】
また、この発明に係る遠心ファンの射出成形金型は、突出金型の中空羽根外周外側の成形面に逆勾配を付けるために外スライドコアを設けると共に、突出金型の中空羽根外周内側の成形面に逆勾配を付けるために傾斜スライドを設けたことを特徴とする。
【００１４】
また、この発明に係る遠心ファンの射出成形金型は、突出金型中空羽根成形面と傾斜スライド中空羽根成形面を滑らかに連続的につながるように傾斜面を設けたことを特徴とする。
【００１５】
この発明に係る遠心ファンの製造方法は、ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの製造方法において、突出金型の中空羽根外周成形面に、型開き時に中空羽根が突出金型に残るような逆勾配を設け、中空羽根を射出成形することを特徴とする。
【００１６】
また、この発明に係る遠心ファンの製造方法は、射出成形金型は、突出金型の中空羽根外周外側の成形面に逆勾配を付けるための外スライドコアを有すると共に、突出金型の中空羽根外周内側の成形面に逆勾配を付けるための傾斜スライドを有し、射出成形金型に樹脂を注入して中空羽根を成形し、中空羽根の成形完了後に、ゲート金型と突出金型の間の面を開き、外スライドコアを中空羽根外周外側面から離し、中空羽根を突出金型から離型する際に、傾斜スライドが作動して中空羽根外周内側面から離れることを特徴とする。
【００１７】
この発明に係る遠心ファンの射出成形金型は、ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの射出成形金型において、肉盗み駒は、ゲート金型に進退自在に設けられていることを特徴とする。
【００１８】
この発明に係る遠心ファンの製造方法は、ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの製造方法において、ゲート金型に進退自在に設けられた肉盗み駒のみを後退作動させて、中空羽根の中空部から高さ方向で所定長さ抜き、その後金型成形品取り出し面を開くことを特徴とする。
【００１９】
また、この発明に係る遠心ファンの製造方法は、ゲート金型に進退自在に設けられた前記肉盗み駒のみを後退作動させて、中空羽根の中空部から高さ方向で約１／３抜き、その後金型成形品取り出し面を開くことを特徴とする。
【００２０】
この発明に係る遠心ファンの射出成形金型は、遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンの射出成形金型において、ねじれた羽根形状にゲート金型側または突出金型側に肉盗み駒を斜め方向から設けて、その肉盗み駒を支える為に肉盗み駒先端に凹形状または凸形状を設け、それにその相手側の突出金型側またはゲート金型側羽根の先端から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒を合わせて、肉盗み駒を支えた構造としたことを特徴とする。
【００２１】
また、この発明に係る遠心ファンの射出成形金型は、傾斜した肉盗み駒の高さは羽根形状高さの約１／２〜１として、抜き勾配は０．１°以上設け、支え駒高さは羽根形状高さの約０〜１／２設けたことを特徴とする。
【００２２】
この発明に係る遠心ファンの製造方法は、遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンの製造方法において、ねじれた羽根形状にゲート金型側または突出金型側に肉盗み駒を斜め方向から設けて、その肉盗み駒を支える為に肉盗み駒先端に凹形状または凸形状を設け、それにその相手側の突出金型側またはゲート金型側羽根の先端から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒を合わせて、肉盗み駒を支えて射出成形することを特徴とする。
【００２３】
また、この発明に係る遠心ファンの製造方法は、ねじれた羽根形状において、ゲート金型側または突出金型側の中空部アンダーカット形状を形成させる為に、肉盗み駒を傾斜させて設け、スライドが動きアンダーカット部である中空部肉盗み形状から完全に駒を抜き、その後に製品取り出し面が開き製品を取り出すことを特徴とする。
【００２４】
また、この発明に係る遠心ファンの製造方法は、肉盗み駒の傾斜に沿って、型開きを利用して動くスライドカム方式によりスライドさせて、アンダーカット形状を抜くことを特徴とする。
【００２５】
また、この発明に係る遠心ファンの製造方法は、肉盗み駒の傾斜に沿って、型開きに関係無しに単独で動かせる油圧シリンダー方式によりスライドさせて、アンダーカット形状を抜くことを特徴とする。
【００２６】
また、この発明に係る遠心ファンの製造方法は、ねじれた羽根形状外周の型が開いた際、アンダーカットで抜けない羽根形状を形成させる為、羽根の内、外面を外側にスライドさせる駒により形成させ、スライドは肉盗み形状駒が完全に抜けた後作動することを特徴とする。
【００２７】
この発明に係る遠心ファンは、遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンにおいて、ねじれた羽根形状は、羽根形状高さ方向に全貫通の中空部を設けたことを特徴とする。
【００２８】
【発明の実施の形態】
以下、この発明の実施の形態を図面に基づいて説明する。
実施の形態１．
図１、２は実施の形態１を示す図で、図１は遠心ファンの完成図と外スライドコアと傾斜スライドの作動方向を示した図、図２は遠心ファンの中空羽根形状金型構造断面図と動作図である。
【００２９】
図において、１は遠心ファンの吸い込み口、２は遠心ファン本体、３は駆動部と接続されるボス部、４ｂは中空の羽根形状、５ｂは羽根形状４ｂを形状高さ方向で貫通させた中空状態にして薄肉化、軽量化するために、射出成形金型のゲート金型に設けられた肉盗み駒、６は肉盗み駒の倒れ抑制のために、射出成形金型の突出金型側に設けられた肉盗み駒支え駒、７ｂは射出成形金型の突出金型の羽根形状外周外面に０°からアンダーカットになる逆向き勾配（型開き時に成形品が突出金型側に残る向き）を付けるために設けられた外スライドコア、８は本発明の特徴部分であり、射出成形金型の突出金型の羽根形状外周内側の成形面に収縮を考慮した逆勾配（型開き時に成形品が突出金型側に残る向き）を０°以上つけるために設けられた傾斜スライド、９は成形品と湯道をつなぐ入口のピンゲートである。
【００３０】
基本動作は従来どおりであるが、発明に関係した動作としては、まずゲート金型１０と突出金型１１の間の面が開くと、突出金型１１側の羽根形状４ｂ外周の内、外面ともに逆勾配であるアンダーカットをつけているため、外スライドコア７ｂと傾斜スライド８を作動させないと成形品を成形面から離すことができないようにしているので、ゲート金型１０側に成形品がとられることなく、確実に突出金型１１側へ付かせることができる。
【００３１】
ゲート金型１０と突出金型１１の間の面の開きが完了後に、外スライドコア７ｂが作動して羽根形状４ｂ外周の外面から離れ、その後エジェクタプレート１５が成形機から突き出された突出バーによって押されて動き（図８参照）、それに伴ない傾斜スライド８が作動して羽根形状４ｂ外周の内面から離れる。
【００３２】
以上の金型構造により、確実に突出金型１１側に成形品をはり付かせることでひけの少ない安定した成形品の連続成形が可能である。
【００３３】
また、上記の金型構造では、突出金型１１の羽根形状４ｂ成形面と傾斜スライド８の羽根形状４ｂ成形面境界部に段差が付くが、突出金型羽根成形面と傾斜スライド羽根成形面を滑らかに連続につなげた傾斜面にすることで、音、風低下などの問題を解決することができる。
【００３４】
実施の形態２．
図３は実施の形態２を示す図で、遠心ファンの中空羽根形状金型構造断面図と動作図である。図３に示すように、中空羽根形状金型構造は、ゲート金型１０の肉盗み駒５ｄが固定されていなく、型開き方向に動くことが特徴である。基本動作は従来と同様なので省略する。
【００３５】
金型動作としては、ゲート金型１０の肉盗み駒５ｄのみをゲート金型１０面と突出金型１１面が開く前に、先に羽根４ｄ中空部から高さ方向で約１／３程後退作動させて成形面から離しておくので、型開き時にゲート金型１０への成形品のとられ、割れが発生せずに確実に突出金型１１へはり付かせることで、ひけの少ない安定した成形品の連続成形が可能である。成形サイクルタイムも短縮して金型製作費用を削減できる。
【００３６】
羽根４ｄ中空部から高さ方向で約１／３程後退作動させて成形面から離しておく例を説明したが、後退させる距離はこれに限定されたものではない。
【００３７】
実施の形態３．
図４、５は実施の形態３を示す図で、図４はねじれた羽根形状の遠心ファンの完成図と外スライドコアの作動方向を示した図、図５はねじれた羽根形状の遠心ファンの中空羽根形状金型構造断面図と動作図である。
【００３８】
図４、５に示すとおり、遠心ファン本体２とねじれた羽根形状４ｃとが一体成形された遠心ファンにおいて、ねじれた羽根形状４ｃにゲート金型１０側または突出金型１１側に肉盗み駒５ｃを斜め方向から設けて、その肉盗み駒５ｃを支える為に肉盗み駒５ｃ先端に凹形状または凸形状を設けて、それにその相手側の突出金型１１側またはゲート金型１０側羽根形状４ｃの先端（吸い込み口１との溶着形状部付近）から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒６を合わせて肉盗み駒５ｃを支えた構造であり、羽根形状高さ方向において全貫通の中空部を設けた上で、射出成形の際に発生する射出圧力による駒倒れをなくした。
【００３９】
また、基本動作は従来どおりであり省略するが、この発明の関係する動作は、ねじれた羽根形状４ｃの為に斜め方向に肉盗み駒５ｃを作動して、成形面から離して抜かないと肉盗み駒５ｃがアンダーカット形状からはずれないので、先に肉盗み駒５ｃを作動させてアンダーカット部である中空部肉盗み形状から完全に肉盗み駒５ｃを抜く必要がある。
【００４０】
そこで、肉盗み駒５ｃを傾斜に沿って型開きを利用して動かすスライドカム方式または型開き関係無しに単独で動かせる油圧シリンダー方式によりスライドさせて、アンダーカット形状を抜く。その後、ゲート金型１０面と突出金型１１面が開くと共に羽根形状４ｃの内、外面がねじれているのでアンダーカットで抜けない構造であり、それを外スライドコア７ｃで形成して動かすことで内、外の成形面から離なして抜いてやるので、ゲート金型１０へのとられをなくし、確実に突出金型１１へはり付かせることでひけの少ない安定した成形品の連続成形が可能である。
【００４１】
また、傾斜肉盗み駒５ｃの高さは羽根４ｃ形状高さの約１／２〜１として、抜き勾配は０．１°以上設け、肉盗み支え駒６高さは羽根４ｃ高さの約０〜１／２設ける仕様である。但し、これは一例であり、この仕様に限定されるものではない。
【００４２】
【発明の効果】
この発明に係る遠心ファンの射出成形金型は、型開き時に中空羽根が突出金型に残るような逆勾配を設けたことにより、ゲート金型へのとられをなくし、確実に突出金型にはり付かせることができ、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。
【００４３】
また、この発明に係る遠心ファンの射出成形金型は、突出金型の中空羽根外周外側の成形面に逆勾配を付けるために外スライドコアを設けると共に、突出金型の中空羽根外周内側の成形面に逆勾配を付けるために傾斜スライドを設けたことにより、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。
【００４４】
また、この発明に係る遠心ファンの射出成形金型は、突出金型中空羽根成形面と傾斜スライド中空羽根成形面を滑らかに連続的につながるように傾斜面を設けたことにより、遠心ファンの音、風低下などの問題を解決することができる。
【００４５】
この発明に係る遠心ファンの製造方法は、突出金型の中空羽根外周成形面に、型開き時に中空羽根が突出金型に残るような逆勾配を設け、中空羽根を射出成形することにより、ゲート金型へのとられをなくし、確実に突出金型にはり付かせることができ、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。
【００４６】
また、この発明に係る遠心ファンの製造方法は、射出成形金型は、突出金型の中空羽根外周外側の成形面に逆勾配を付けるための外スライドコアを有すると共に、突出金型の中空羽根外周内側の成形面に逆勾配を付けるための傾斜スライドを有し、射出成形金型に樹脂を注入して中空羽根を成形し、中空羽根の成形完了後に、ゲート金型と突出金型の間の面を開き、外スライドコアを中空羽根外周外側面から離し、中空羽根を突出金型から離型する際に、傾斜スライドが作動して中空羽根外周内側面から離れることにより、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。
【００４７】
この発明に係る遠心ファンの射出成形金型は、ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの射出成形金型において、肉盗み駒は、ゲート金型に進退自在に設けられていることにより、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。成形サイクルタイムも短縮して金型製作費用を削減できる。
【００４８】
この発明に係る遠心ファンの製造方法は、ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの製造方法において、ゲート金型に進退自在に設けられた肉盗み駒のみを後退作動させて、中空羽根の中空部から高さ方向で所定長さ抜き、その後金型成形品取り出し面を開くことにより、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。成形サイクルタイムも短縮して金型製作費用を削減できる。
【００４９】
また、この発明に係る遠心ファンの製造方法は、ゲート金型に進退自在に設けられた前記肉盗み駒のみを後退作動させて、中空羽根の中空部から高さ方向で約１／３抜き、その後金型成形品取り出し面を開くことにより、型開き時の割れ不良をなくすことができ、成形品の連続成形を可能にできる。成形サイクルタイムも短縮して金型製作費用を削減できる。
【００５０】
この発明に係る遠心ファンの射出成形金型は、ねじれた羽根形状にゲート金型側または突出金型側に肉盗み駒を斜め方向から設けて、その肉盗み駒を支える為に肉盗み駒先端に凹形状または凸形状を設け、それにその相手側の突出金型側またはゲート金型側羽根の先端から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒を合わせて、肉盗み駒を支えた構造としたことにより、ゲート金型へのとられをなくし、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５１】
また、この発明に係る遠心ファンの射出成形金型は、傾斜した肉盗み駒の高さは羽根形状高さの約１／２〜１として、抜き勾配は０．１°以上設け、支え駒高さは羽根形状高さの約０〜１／２設けたことにより、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５２】
この発明に係る遠心ファンの製造方法は、ねじれた羽根形状にゲート金型側または突出金型側に肉盗み駒を斜め方向から設けて、その肉盗み駒を支える為に肉盗み駒先端に凹形状または凸形状を設け、それにその相手側の突出金型側またはゲート金型側羽根の先端から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒を合わせて、肉盗み駒を支えて射出成形することにより、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５３】
また、この発明に係る遠心ファンの製造方法は、ねじれた羽根形状において、ゲート金型側または突出金型側の中空部アンダーカット形状を形成させる為に、肉盗み駒を傾斜させて設け、スライドが動きアンダーカット部である中空部肉盗み形状から完全に駒を抜き、その後に製品取り出し面が開き製品を取り出すことにより、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５４】
また、この発明に係る遠心ファンの製造方法は、肉盗み駒の傾斜に沿って、型開きを利用して動くスライドカム方式によりスライドさせて、アンダーカット形状を抜くことにより、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５５】
また、この発明に係る遠心ファンの製造方法は、肉盗み駒の傾斜に沿って、型開きに関係無しに単独で動かせる油圧シリンダー方式によりスライドさせて、アンダーカット形状を抜くことにより、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５６】
また、この発明に係る遠心ファンの製造方法は、ねじれた羽根形状外周の型が開いた際、アンダーカットで抜けない羽根形状を形成させる為、羽根の内、外面を外側にスライドさせる駒により形成させ、スライドは肉盗み形状駒が完全に抜けた後作動することにより、確実に突出金型へはり付かせることでひけの少ない安定した成形品の連続成形が可能になる。
【００５７】
この発明に係る遠心ファンは、遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンにおいて、ねじれた羽根形状は、羽根形状高さ方向に全貫通の中空部を設けたことにより、薄肉化、軽量化が図れる。
【図面の簡単な説明】
【図１】実施の形態１を示す図で、遠心ファンの完成図と外スライドコアと傾斜スライドの作動方向を示した図である。
【図２】実施の形態１を示す図で、遠心ファンの中空羽根形状金型構造断面図と動作図である。
【図３】実施の形態２を示す図で、遠心ファンの中空羽根形状金型構造断面図と動作図である。
【図４】実施の形態３を示す図で、ねじれた羽根形状の遠心ファンの完成図と外スライドコアの作動方向を示した図である。
【図５】実施の形態３を示す図で、ねじれた羽根形状の遠心ファンの中空羽根形状金型構造断面図と動作図である。
【図６】従来の遠心ファンの完成図と外スライドコアの作動方向を示した図である。
【図７】従来の遠心ファンの中空羽根形状金型構造断面図と動作図である。
【図８】従来の金型の基本動作図である。
【符号の説明】
１　吸い込み口、２　遠心ファン本体、４ａ〜４ｄ　羽根形状、５ａ〜５ｄ　肉盗み駒、６　肉盗み支え駒、７ａ〜７ｄ　外スライドコア、８　傾斜スライド、９　ピンゲート、１０　ゲート金型、１１　突出金型、１２　ランナーストリッパプレート、１３　ゲート側取付板、１５　突出プレート、１７　突出バー、１８　突出ピン、１９　ランナーロックピン。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a centrifugal fan used for a blower such as an air conditioner.
[0002]
[Prior art]
6 to 8 are views showing a conventional technique, FIG. 6 is a view showing a completed view of a conventional centrifugal fan and a slide operation direction, and FIG. 7 is a sectional view and an operation view of a hollow centrifugal fan-shaped mold of the conventional centrifugal fan. FIG. 8 is a basic operation diagram of a conventional mold. In a conventional centrifugal fan, a hollow vane-shaped mold is provided with a meat stealing piece 5a, and the vane shape 4a is pierced in the shape height direction. By providing the meat stealing piece 5a in the blade shape 4a of the integrally molded product of the main body 2 and the blade shape 4a, the resin is held by the resin stealing piece 5a by shrinkage of the resin in the cooling step after injection, and when the mold is opened (the molded article). The molded product follows the gate mold side 10 (the take-out surface is open). In addition, at the time of injection, a problem arises that the stealing piece 5a falls down due to the injection pressure and cannot be molded.
[0003]
Therefore, as a countermeasure against the gate mold 10, the outer slide core 7a is provided on the outer side of the blade shape 4a so that the outer peripheral surface of the blade shape 4a on the side of the protruding die 11 has a reverse gradient from 0 ° to undercut. The surface of the stealing piece 5a is finished to a mirror surface, and the molded product remains on the protruding mold 11 by preventing the heat sinking piece 5a from adhering in consideration of heat radiation by cooling.
[0004]
Further, since the thickness of the meat stealing piece 5a is thin, a concave shape is provided at the tip of the meat stealing piece 5a and the tip of the protruding mold 11 side blade shape 4a (in the vicinity of the welded shape with the suction port 1) as a countermeasure against falling down. In addition to supporting the gate mold 10 with the meat stealing piece supporting piece 6 having a convex shape for supporting the piece at the tip, the resin enters the pin gate 9 at the position of the pin tip 9 from the longitudinal end of the blade shape 4a. A high-quality centrifugal fan, which is light in weight and flows down along the blade shape 4a and the meat stealing piece 5a to prevent the meat stealing piece 5a from falling down due to the injection pressure, and suppresses the occurrence of sink marks, can be formed. It is now possible. If sink marks occur on the surface of the blade shape 4a, the predetermined shape will not be obtained, which will affect the product performance.
[0005]
However, the current countermeasures are taken by the gate mold side and cannot be said to be complete countermeasures. The cause is that the outer peripheral outer slide core of the protruding die 11 side blade shape 4a has a slope on the opposite side, but the reverse inner slope of the blade shape 4a is not provided with a reverse slope, so that the gate is opened when the mold is opened. The balance between the mold 10 side and the protruding mold 11 side is poor and the sticking to the inner surface of the meat stealing piece 5a is larger than the inner surface of the blade shape 4a protruding mold side, so that the inner surface of the blade shape 4a is closer to the gate mold 10 side. Further, since the outer surface is formed on the side of the protruding mold 11, there is a problem that the molded product is cracked due to the shape of pulling each other and continuous molding is difficult.
[0006]
Next, the operation will be described with reference to FIG. First, a resin is injected from the gate opening of the gate mold mounting plate 13 to complete a centrifugal fan molded product. Thereafter, the gap between the runner stripper plate 12 and the gate mold 10 is opened with the gate mold mounting plate 13 fixed to the molding machine, and the runner (runner to the molded product) and the pin gate 9 (the molded product and the runner are connected). (Connecting entrance) from the molded product. The runner and gate will be removed later.
[0007]
Thereafter, the gap between the gate mold mounting plate 13 and the runner stripper plate 12 is opened, and the runner is separated from the runner lock pin 19 serving to separate the pin gate 9 from the molded product by securely bringing the runner or the like to the runner stripper plate 12 side. It is. Since the shape of the runner lock pin 19 entering the runner has an undercut shape, it can be brought to the runner stripper plate 12 side.
[0008]
Finally, the protruding mold 11 moves to open the gate mold 10 and the protruding mold 11, and the molded product comes to the protruding mold 11. At this time, when the molded product is pulled to the protruding mold 11 in a state where the blade shape 4a is hung on the meat stealing piece 5a and remains in the gate mold 10, the protruding mold 11 and the gate mold 10 close the blade shape root. They are pulled together and split.
[0009]
After the above mold opening is completely completed, the outer slide core 7a moves and the undercut blade-shaped surface comes off. Thereafter, the projecting bar 17 is pushed out of the molding machine, the ejector plate 15 moves, and the molded product is pushed out by the projecting pin 18 and taken out. Thereafter, the plates such as the gate mold 10 and the protruding mold 11 are moved and tightened to return to the state before the resin injection, and the operation described above is repeated again.
[0010]
[Problems to be solved by the invention]
Since the conventional centrifugal fan mold is configured as described above, the meat stealing piece 5a of the gate mold 10 is pulled out with good balance on the inner surface of the blade shape 4a, and is taken by the meat stealing piece 5a when the mold is opened. It is necessary to attach it to the protruding mold 11 side. Further, at present, the blade shape 4a of the molded product is held by the contraction of the resin on the meat stealing piece 5a, and when the mold is opened, the outer blade shape 4a is attached to the protruding mold 11 by the slide core 7a having the undercut shape. However, the inside of the blade shape 4a is taken by the meat stealing piece 5a, and there is a problem that the gate mold 10 and the protruding mold 11 are pulled and cracked to each other.
[0011]
The present invention has been made in order to solve the above problems, and has a structure in which a molded product is securely attached to a protruding mold side by eliminating a molded product from being taken to a gate mold side. It is an object of the present invention to eliminate the cracks of the molded product by the above method, and further to enable the continuous molding by eliminating the cracks caused by the molded product being taken to the gate mold side.
[0012]
[Means for Solving the Problems]
An injection molding die for a centrifugal fan according to the present invention is an injection molding die for a centrifugal fan that forms a hollow blade by providing a burglar piece in an injection molding die having a gate die and a protruding die. The hollow blade outer peripheral molding surface of the mold is provided with a reverse gradient such that the hollow blade remains in the protruding mold when the mold is opened.
[0013]
In addition, the injection molding die of the centrifugal fan according to the present invention is provided with an outer slide core for providing a reverse slope to the molding surface on the outer periphery of the hollow blade of the protruding die, and the molding of the inner periphery of the hollow blade on the protruding die. It is characterized in that an inclined slide is provided to give a reverse slope to the surface.
[0014]
Further, the injection molding die of the centrifugal fan according to the present invention is characterized in that an inclined surface is provided so as to smoothly and continuously connect the projecting die hollow blade molding surface and the inclined slide hollow blade molding surface.
[0015]
The method for manufacturing a centrifugal fan according to the present invention is directed to a method for manufacturing a centrifugal fan, in which a hollow blade is formed by providing a pit in a molding die having a gate die and a protruding die. The outer peripheral molding surface is provided with a reverse gradient such that the hollow blade remains in the protruding mold when the mold is opened, and the hollow blade is injection-molded.
[0016]
Further, in the method for manufacturing a centrifugal fan according to the present invention, the injection molding die has an outer slide core for imparting a reverse gradient to the molding surface on the outer periphery of the hollow blade outer periphery of the protruding die, and the hollow blade of the protruding die. It has an inclined slide for giving a reverse slope to the molding surface inside the outer circumference, injects resin into the injection molding mold to mold the hollow blade, and after the completion of the molding of the hollow blade, between the gate mold and the protruding mold When the surface is opened, the outer slide core is separated from the outer peripheral surface of the hollow blade outer periphery, and when the hollow blade is released from the protruding mold, the inclined slide operates to separate from the inner peripheral surface of the hollow blade outer periphery.
[0017]
An injection molding die for a centrifugal fan according to the present invention is a injection molding die for a centrifugal fan that forms a hollow vane by providing a meat stealing piece in an injection mold having a gate mold and a protruding mold. The piece is provided in the gate mold so as to be able to move forward and backward.
[0018]
The method for manufacturing a centrifugal fan according to the present invention is directed to a method for manufacturing a centrifugal fan in which a hollow blade is formed by providing a burglar piece in an injection molding die having a gate die and a protruding die. Only the meat stealing piece provided in the above is retracted to remove a predetermined length from the hollow portion of the hollow blade in the height direction, and then the mold molded product take-out surface is opened.
[0019]
Further, the method for manufacturing a centrifugal fan according to the present invention is characterized in that only the meat stealing piece provided in the gate mold so as to be able to move forward and backward is retracted, and about 1/3 is removed from the hollow portion of the hollow blade in the height direction. Thereafter, the mold molded product take-out surface is opened.
[0020]
The centrifugal fan injection molding die according to the present invention is a centrifugal fan injection molding die in which a centrifugal fan main body and a twisted blade shape are integrally formed. A stealing piece is provided diagonally, and a concave or convex shape is provided at the tip of the stealing piece in order to support the stealing piece, and from the tip of the protruding mold side or gate mold side blade on the other side. The structure is characterized in that the meat stealing support piece, which has protruded and has a convex or concave shape for supporting the piece at its tip, is combined to support the meat stealing piece.
[0021]
In addition, in the injection molding die of the centrifugal fan according to the present invention, the height of the inclined stealing piece is set to about 1/2 to 1 of the blade shape height, the draft is provided at 0.1 ° or more, and the height of the support piece is provided. Is characterized in that about 0 to 1/2 of the blade-shaped height is provided.
[0022]
The method for manufacturing a centrifugal fan according to the present invention is the method for manufacturing a centrifugal fan in which the centrifugal fan body and the twisted blade shape are integrally formed. Is provided in an oblique direction, a concave or convex shape is provided at the tip of the meat stealing piece to support the meat stealing piece, and it protrudes from the tip of the protruding mold side or the gate mold side blade on the other side thereof, It is characterized in that the meat stealing support piece having a convex or concave shape for supporting the piece at the tip is combined, and the meat stealing piece is supported and injection molded.
[0023]
Further, in the method for manufacturing a centrifugal fan according to the present invention, in order to form a hollow undercut shape on a gate mold side or a protruding mold side in a twisted blade shape, a slug of a meat stealing piece is provided, and a slide is provided. Is characterized in that the piece is completely removed from the stealing shape of the hollow portion, which is the undercut portion, and then the product take-out surface is opened to take out the product.
[0024]
Further, the method for manufacturing a centrifugal fan according to the present invention is characterized in that the undercut shape is pulled out by sliding along a slope of the meat stealing piece by a slide cam method that moves using a mold opening.
[0025]
Further, a method of manufacturing a centrifugal fan according to the present invention is characterized in that the undercut shape is removed by sliding along a slope of a meat stealing piece by a hydraulic cylinder method that can be moved independently irrespective of the mold opening.
[0026]
Further, in the method for manufacturing a centrifugal fan according to the present invention, when the outer peripheral mold of the twisted blade shape is opened, the blade shape is formed by sliding the inner surface and the outer surface outward in order to form a blade shape that does not come off by undercut. The slide is characterized in that it operates after the steal-shaped piece is completely removed.
[0027]
The centrifugal fan according to the present invention is characterized in that, in the centrifugal fan in which the centrifugal fan main body and the twisted blade shape are integrally formed, the twisted blade shape has a hollow portion that is entirely penetrated in the blade shape height direction. I do.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 and 2 are diagrams showing Embodiment 1. FIG. 1 is a diagram showing a completed view of a centrifugal fan and an operation direction of an outer slide core and an inclined slide. FIG. 2 is a cross-sectional view of a hollow vane-shaped mold structure of the centrifugal fan. It is a figure and an operation figure.
[0029]
In the drawing, 1 is a suction port of a centrifugal fan, 2 is a centrifugal fan main body, 3 is a boss portion connected to a drive unit, 4b is a hollow blade shape, 5b is a hollow with a blade shape 4b penetrating in the shape height direction. In order to make it thinner and lighter, a stealing piece provided on the gate mold of the injection mold, 6 is provided on the protruding mold side of the injection mold to prevent the stealing piece from falling down. The robbed piece supporting piece 7b has a reverse gradient from 0 ° to undercut on the outer peripheral surface of the blade shape of the protruding mold of the injection mold (the direction in which the molded product remains on the protruding mold side when the mold is opened). The outer slide core 8 provided for attachment is a characteristic part of the present invention, and has a reverse slope (the molded product is opened when the mold is opened) in consideration of shrinkage on the molding surface inside the outer periphery of the blade shape of the protruding mold of the injection mold. (The direction remaining on the protruding mold side) is set at 0 ° or more. The oblique slide 9 is a pin gate at the entrance connecting the molded product and the runner.
[0030]
Although the basic operation is the same as the conventional operation, the operation related to the present invention is as follows. First, when the surface between the gate die 10 and the protruding die 11 is opened, the inner and outer surfaces of the outer periphery of the blade shape 4b on the protruding die 11 side are both Since the undercut having a reverse slope is provided, the molded product cannot be separated from the molding surface unless the outer slide core 7b and the inclined slide 8 are actuated. It can be reliably attached to the protruding mold 11 side without being performed.
[0031]
After the opening of the surface between the gate mold 10 and the projecting mold 11 is completed, the outer slide core 7b operates to separate from the outer surface of the outer periphery of the blade shape 4b, and then the ejector plate 15 is moved by the projecting bar projected from the molding machine. When pushed and moved (see FIG. 8), the inclined slide 8 is actuated to move away from the inner surface of the outer periphery of the blade shape 4b.
[0032]
With the above-described mold structure, the molded product can be stably adhered to the protruding mold 11 side, so that a stable molded product with little sink mark can be continuously formed.
[0033]
In the above-described mold structure, a step is formed at the boundary between the blade-shaped 4b molding surface of the protruding mold 11 and the blade-shaped 4b molding surface of the inclined slide 8, but the projecting mold blade molding surface and the inclined slide blade molding surface are not aligned. By making the slopes connected smoothly and continuously, problems such as sound and wind drop can be solved.
[0034]
Embodiment 2 FIG.
FIG. 3 shows a second embodiment, and is a sectional view and an operation diagram of a hollow vane-shaped mold structure of a centrifugal fan. As shown in FIG. 3, the hollow vane-shaped mold structure is characterized in that the stealing piece 5 d of the gate mold 10 is not fixed and moves in the mold opening direction. The basic operation is the same as the conventional operation, and a description thereof is omitted.
[0035]
As the mold operation, only the meat stealing piece 5d of the gate mold 10 is retracted by about 1/3 in the height direction from the hollow portion of the blade 4d before the gate mold 10 and the protruding mold 11 open. Since it is operated and kept away from the molding surface, the molded product is taken into the gate mold 10 when the mold is opened, and is securely stuck to the protruding mold 11 without cracking, so that the sink is stable and the sink is small. Continuous molding of molded products is possible. The molding cycle time can also be shortened, and the mold manufacturing cost can be reduced.
[0036]
An example has been described in which the blade 4d is retracted about 1/3 in the height direction from the hollow portion and is separated from the molding surface. However, the distance to be retracted is not limited to this.
[0037]
Embodiment 3 FIG.
4 and 5 are diagrams showing Embodiment 3. FIG. 4 is a diagram showing a completed view of a centrifugal fan having a twisted blade shape and an operation direction of an outer slide core. FIG. 5 is a diagram showing a centrifugal fan having a twisted blade shape. It is a sectional view and an operation diagram of a hollow blade shape mold structure.
[0038]
As shown in FIGS. 4 and 5, in the centrifugal fan in which the centrifugal fan main body 2 and the twisted blade shape 4c are integrally formed, the twisted blade shape 4c is inserted into the gate mold 10 side or the protruding mold 11 side with a stealing piece 5c. Is provided diagonally, and a concave or convex shape is provided at the tip of the meat stealing piece 5c to support the meat stealing piece 5c, and the protruding mold 11 side or the gate mold 10 side blade shape 4c on the other end thereof is provided. And a meat stealing support piece 6 protruding from the tip (near the welded shape portion with the suction port 1) and having a convex or concave shape for supporting the piece at the tip, and supporting the meat stealing piece 5c. In addition, after providing a hollow portion that penetrates all the way in the height direction of the blade shape, a piece collapse due to injection pressure generated during injection molding is eliminated.
[0039]
Although the basic operation is the same as the conventional operation and is omitted, the operation related to the present invention is that the meat stealing piece 5c is actuated obliquely for the twisted blade shape 4c, and the meat must be removed from the molding surface. Since the stealing piece 5c does not deviate from the undercut shape, it is necessary to first operate the meat stealing piece 5c to completely remove the meat stealing piece 5c from the hollow meat stealing shape that is the undercut portion.
[0040]
Therefore, the undercut shape is pulled out by sliding the meat stealing piece 5c along a slope by using a slide cam system that moves using a mold opening or a hydraulic cylinder system that can move alone without a mold opening relationship. Thereafter, the gate mold 10 and the protruding mold 11 are opened, and the outer surface of the blade shape 4c is twisted, so that it is not cut off by undercut. By forming it with the outer slide core 7c and moving it, Since it is pulled away from the inner and outer molding surfaces, it can be removed from the gate mold 10 and securely adhered to the protruding mold 11 to enable continuous molding of stable molded products with little sink mark. It is.
[0041]
Further, the height of the inclined meat stealing piece 5c is about 1/2 to 1 of the shape height of the blade 4c, the draft angle is provided at 0.1 ° or more, and the height of the meat stealing support piece 6 is about 0 of the height of the blade 4c. It is a specification to provide １ ／. However, this is an example, and the present invention is not limited to this specification.
[0042]
【The invention's effect】
The injection mold of the centrifugal fan according to the present invention has a reverse slope such that the hollow blades remain on the projecting mold when the mold is opened, so that the gate mold is not taken off and the projecting mold is surely formed. Adhesion can be made, cracking failure at the time of opening the mold can be eliminated, and continuous molding of a molded product can be performed.
[0043]
In addition, the injection molding die of the centrifugal fan according to the present invention is provided with an outer slide core for providing a reverse slope to the molding surface on the outer periphery of the hollow blade of the protruding die, and the molding of the inner periphery of the hollow blade on the protruding die. The provision of the inclined slide for imparting a reverse slope to the surface makes it possible to eliminate cracking at the time of opening the mold and to enable continuous molding of a molded product.
[0044]
In addition, the injection molding die of the centrifugal fan according to the present invention has an inclined surface that smoothly and continuously connects the projecting die hollow blade forming surface and the inclined slide hollow blade forming surface, so that the sound of the centrifugal fan is improved. It can solve problems such as wind drop.
[0045]
The method for manufacturing a centrifugal fan according to the present invention is characterized in that the hollow blade outer peripheral forming surface of the protruding die is provided with a reverse gradient such that the hollow blade remains in the protruding die when the mold is opened, and the hollow blade is injection-molded, thereby forming a gate. It is possible to prevent the mold from sticking to the mold and securely adhere to the protruding mold, to eliminate cracking defects when the mold is opened, and to enable continuous molding of molded products.
[0046]
Further, in the method for manufacturing a centrifugal fan according to the present invention, the injection molding die has an outer slide core for imparting a reverse gradient to the molding surface on the outer periphery of the hollow blade outer periphery of the protruding die, and the hollow blade of the protruding die. It has an inclined slide for giving a reverse slope to the molding surface inside the outer circumference, injects resin into the injection molding mold to mold the hollow blade, and after the completion of the molding of the hollow blade, between the gate mold and the protruding mold Surface, the outer slide core is separated from the outer surface of the outer periphery of the hollow blade, and when the hollow blade is released from the protruding mold, the inclined slide is actuated to separate from the inner surface of the outer periphery of the hollow blade. Cracking defects can be eliminated, and continuous molding of molded articles can be performed.
[0047]
An injection molding die for a centrifugal fan according to the present invention is a injection molding die for a centrifugal fan that forms a hollow vane by providing a meat stealing piece in an injection mold having a gate mold and a protruding mold. Since the pieces are provided in the gate mold so as to be able to advance and retreat, cracks can be prevented from occurring when the mold is opened, and continuous molding of molded articles can be performed. The molding cycle time can also be shortened, and the mold manufacturing cost can be reduced.
[0048]
The method for manufacturing a centrifugal fan according to the present invention is directed to a method for manufacturing a centrifugal fan in which a hollow blade is formed by providing a burglar piece in an injection molding die having a gate die and a protruding die. Eliminating cracking when opening the mold by retracting only the meat stealing piece provided in, removing a predetermined length in the height direction from the hollow part of the hollow blade, and then opening the mold molded product removal surface And the continuous molding of the molded article can be performed. The molding cycle time can also be shortened, and the mold manufacturing cost can be reduced.
[0049]
Further, the method for manufacturing a centrifugal fan according to the present invention is characterized in that only the meat stealing piece provided in the gate mold so as to be able to move forward and backward is retracted, and about 1/3 is removed from the hollow portion of the hollow blade in the height direction. Thereafter, by opening the mold-molded product take-out surface, cracking failure at the time of mold opening can be eliminated, and continuous molding of the molded product can be performed. The molding cycle time can also be shortened, and the mold manufacturing cost can be reduced.
[0050]
The injection molding die of the centrifugal fan according to the present invention is provided with a meat stealing piece in a twisted blade shape on the gate mold side or the protruding mold side in an oblique direction, and a tip of the meat stealing piece to support the meat stealing piece. Is provided with a concave or convex shape, and a meat stealing support piece provided with a convex or concave shape for supporting the piece at the tip protruding from the tip of the protruding mold side or the gate mold side blade on the other side. In addition, by adopting a structure that supports the meat stealing piece, it is possible to eliminate the drop in the gate mold and securely adhere to the protruding mold to enable continuous molding of stable molded products with little sink mark .
[0051]
In addition, in the injection molding die of the centrifugal fan according to the present invention, the height of the inclined stealing piece is set to about 1/2 to 1 of the blade shape height, the draft is provided at 0.1 ° or more, and the height of the support piece is provided. By providing about 0 to 1/2 of the height of the blade shape, it is possible to continuously mold a stable molded product with little sink mark by securely attaching to the protruding mold.
[0052]
The method for manufacturing a centrifugal fan according to the present invention is characterized in that a stealing piece is provided diagonally on the gate mold side or the protruding mold side in a twisted blade shape, and a concave is formed at the tip of the stealing piece to support the stealing piece. Provide a shape or convex shape, and match it with a meat stealing support piece that protrudes from the tip of the protruding mold side or gate mold side blade on the other side and has a convex or concave shape for supporting the piece at the tip. By performing the injection molding while supporting the stealing piece, it is possible to stably adhere to the protruding die, thereby enabling continuous molding of a stable molded product with little sink mark.
[0053]
Further, in the method for manufacturing a centrifugal fan according to the present invention, in order to form a hollow undercut shape on a gate mold side or a protruding mold side in a twisted blade shape, a slug of a meat stealing piece is provided, and a slide is provided. The product is completely removed from the stealing shape of the hollow part, which is the undercut part, and then the product take-out surface opens and the product is taken out. Can be continuously formed.
[0054]
In addition, the method for manufacturing a centrifugal fan according to the present invention is such that a slide cam system that moves using a mold opening is slid along a slope of a meat stealing piece, and an undercut shape is removed, thereby reliably forming a projecting mold. By sticking, it is possible to continuously form a stable molded product with little sink mark.
[0055]
In addition, the method for manufacturing a centrifugal fan according to the present invention is characterized in that the metal is slid along the inclination of the meat stealing piece by a hydraulic cylinder system that can be moved independently irrespective of the mold opening, and the undercut shape is pulled out, so that the protruding metal is securely inserted. By sticking to a mold, continuous molding of a stable molded product with little sink mark becomes possible.
[0056]
Further, in the method for manufacturing a centrifugal fan according to the present invention, when the outer peripheral mold of the twisted blade shape is opened, the blade shape is formed by sliding the inner surface and the outer surface outward in order to form a blade shape that does not come off by undercut. Then, the slide is operated after the stealing-shaped piece is completely removed, so that the slide is securely attached to the protruding mold, thereby enabling continuous molding of a stable molded product with little sink mark.
[0057]
The centrifugal fan according to the present invention is a centrifugal fan in which a centrifugal fan main body and a twisted blade shape are integrally formed. Weight and weight reduction.
[Brief description of the drawings]
FIG. 1 is a view showing a first embodiment, showing a completed view of a centrifugal fan and an operation direction of an outer slide core and an inclined slide.
FIG. 2 shows the first embodiment, and is a sectional view and an operation view of a hollow vane-shaped mold structure of a centrifugal fan.
FIG. 3 shows the second embodiment, and is a sectional view and an operation diagram of a hollow vane-shaped mold structure of a centrifugal fan.
FIG. 4 is a view showing the third embodiment, and is a view showing a completed view of a centrifugal fan having a twisted blade shape and an operation direction of an outer slide core.
FIG. 5 is a view showing a third embodiment, and is a sectional view and an operation view of a hollow blade-shaped mold structure of a centrifugal fan having a twisted blade shape.
FIG. 6 is a diagram showing a completed view of a conventional centrifugal fan and an operation direction of an outer slide core.
FIG. 7 is a sectional view and an operation view of a hollow vane-shaped mold structure of a conventional centrifugal fan.
FIG. 8 is a basic operation diagram of a conventional mold.
[Explanation of symbols]
1 suction port, 2 centrifugal fan body, 4a-4d blade shape, 5a-5d meat stealing piece, 6 meat stealing support piece, 7a-7d outer slide core, 8 inclined slide, 9 pin gate, 10 gate mold, 11 protruding metal Mold, 12 runner stripper plate, 13 gate side mounting plate, 15 projecting plate, 17 projecting bar, 18 projecting pin, 19 runner lock pin.

Claims (16)

ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの射出成形金型において、
前記突出金型の中空羽根外周成形面に、型開き時に前記中空羽根が前記突出金型に残るような逆勾配を設けたことを特徴とする遠心ファンの射出成形金型。In the injection molding die of a centrifugal fan that forms a hollow blade by providing a stealing piece in an injection molding die having a gate die and a protruding die,
An injection molding die for a centrifugal fan, characterized in that the hollow blade outer peripheral molding surface of the projecting die is provided with a reverse gradient such that the hollow blade remains in the projecting die when the mold is opened. 前記突出金型の中空羽根外周外側の成形面に逆勾配を付けるために外スライドコアを設けると共に、前記突出金型の中空羽根外周内側の成形面に逆勾配を付けるために傾斜スライドを設けたことを特徴とする請求項１に記載の遠心ファンの射出成形金型。An outer slide core was provided to apply a reverse gradient to the molding surface on the outer periphery of the hollow blade of the protruding mold, and an inclined slide was provided to impart a reverse gradient to the molding surface on the inner periphery of the hollow blade outer periphery of the protruding mold. The injection mold of a centrifugal fan according to claim 1, wherein: 前記突出金型中空羽根成形面と前記傾斜スライド中空羽根成形面を滑らかに連続的につながるように傾斜面を設けたことを特徴とする請求項２に記載の遠心ファンの射出成形金型。The injection molding die for a centrifugal fan according to claim 2, wherein an inclined surface is provided so as to smoothly and continuously connect the protruding die hollow blade molding surface and the inclined slide hollow blade molding surface. ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの製造方法において、
前記突出金型の中空羽根外周成形面に、型開き時に前記中空羽根が前記突出金型に残るような逆勾配を設け、前記中空羽根を射出成形することを特徴とする遠心ファンの製造方法。In a method of manufacturing a centrifugal fan that forms a hollow blade by providing a burglar piece in an injection mold having a gate mold and a projecting mold,
A method for manufacturing a centrifugal fan, characterized in that a hollow blade outer peripheral forming surface of the protruding die is provided with a reverse gradient such that the hollow blade remains in the protruding die when the mold is opened, and the hollow blade is injection-molded. 前記射出成形金型は、前記突出金型の中空羽根外周外側の成形面に逆勾配を付けるための外スライドコアを有すると共に、前記突出金型の中空羽根外周内側の成形面に逆勾配を付けるための傾斜スライドを有し、
前記射出成形金型に樹脂を注入して前記中空羽根を成形し、
前記中空羽根の成形完了後に、前記ゲート金型と前記突出金型の間の面を開き、
前記外スライドコアを前記中空羽根外周外側面から離し、
前記中空羽根を前記突出金型から離型する際に、前記傾斜スライドが作動して前記中空羽根外周内側面から離れることを特徴とする請求項４に記載の遠心ファンの製造方法。The injection mold has an outer slide core for giving a reverse gradient to the molding surface on the outer periphery of the hollow blade of the protruding mold, and imparts a reverse gradient to the molding surface on the outer periphery of the hollow blade of the protruding mold. Has an inclined slide for
Injecting a resin into the injection mold to form the hollow blade,
After completion of the molding of the hollow blade, open the surface between the gate mold and the protruding mold,
Separate the outer slide core from the hollow blade outer peripheral outer surface,
The method for manufacturing a centrifugal fan according to claim 4, wherein when the hollow blade is released from the protruding mold, the inclined slide operates to separate from the inner peripheral surface of the hollow blade. ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの射出成形金型において、
前記肉盗み駒は、前記ゲート金型に進退自在に設けられていることを特徴とする遠心ファンの射出成形金型。In the injection molding die of a centrifugal fan that forms a hollow blade by providing a stealing piece in an injection molding die having a gate die and a protruding die,
The injection molding die of a centrifugal fan, wherein the stealing piece is provided on the gate die so as to be able to advance and retreat. ゲート金型と突出金型とを有する射出成形金型に肉盗み駒を設けて中空羽根を成形する遠心ファンの製造方法において、
前記ゲート金型に進退自在に設けられた前記肉盗み駒のみを後退作動させて、前記中空羽根の中空部から高さ方向で所定長さ抜き、その後金型成形品取り出し面を開くことを特徴とする遠心ファンの製造方法。In a method of manufacturing a centrifugal fan that forms a hollow blade by providing a burglar piece in an injection mold having a gate mold and a projecting mold,
It is characterized in that only the meat stealing piece provided to be able to move forward and backward in the gate mold is retracted, a predetermined length is removed from the hollow portion of the hollow blade in the height direction, and then the mold molded product take-out surface is opened. Centrifugal fan manufacturing method. 前記ゲート金型に進退自在に設けられた前記肉盗み駒のみを後退作動させて、前記中空羽根の中空部から高さ方向で約１／３抜き、その後金型成形品取り出し面を開くことを特徴とする請求項７に記載の遠心ファンの製造方法。By retracting only the meat stealing piece provided in the gate mold so as to be able to advance and retreat, removing about 1/3 in the height direction from the hollow portion of the hollow blade, and then opening the mold molded product take-out surface. The method for manufacturing a centrifugal fan according to claim 7, wherein: 遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンの射出成形金型において、
前記ねじれた羽根形状にゲート金型側または突出金型側に肉盗み駒を斜め方向から設けて、その肉盗み駒を支える為に肉盗み駒先端に凹形状または凸形状を設け、それにその相手側の突出金型側またはゲート金型側羽根の先端から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒を合わせて、前記肉盗み駒を支えた構造としたことを特徴とする遠心ファンの射出成形金型。In an injection molding die of a centrifugal fan in which a centrifugal fan body and a twisted blade shape are integrally formed,
In the twisted blade shape, a meat stealing piece is provided diagonally on the gate mold side or the protruding mold side, and a concave or convex shape is provided at the tip of the meat stealing piece to support the meat stealing piece, A structure in which the meat stealing piece is supported by combining a meat stealing support piece having a convex or concave shape for supporting a piece at the tip, which protrudes from the tip of the side protruding mold side or the gate mold side blade. An injection molding die for a centrifugal fan. 前記傾斜した肉盗み駒の高さは羽根形状高さの約１／２〜１として、抜き勾配は０．１°以上設け、支え駒高さは羽根形状高さの約０〜１／２設けたことを特徴とする請求項９に記載の遠心ファンの射出成形金型。The height of the inclined meat stealing piece is about 1/2 to 1 of the blade shape height, the draft is provided at 0.1 ° or more, and the support piece height is provided at about 0 to 1/2 of the blade shape height. The injection mold of a centrifugal fan according to claim 9, wherein: 遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンの製造方法において、
前記ねじれた羽根形状にゲート金型側または突出金型側に肉盗み駒を斜め方向から設けて、その肉盗み駒を支える為に肉盗み駒先端に凹形状または凸形状を設け、それにその相手側の突出金型側またはゲート金型側羽根の先端から飛出た、先端に駒支え用の凸形状または凹形状を設けた肉盗み支え駒を合わせて、前記肉盗み駒を支えて射出成形することを特徴とする遠心ファンの製造方法。In a method of manufacturing a centrifugal fan in which a centrifugal fan body and a twisted blade shape are integrally formed,
In the twisted blade shape, a meat stealing piece is provided diagonally on the gate mold side or the protruding mold side, and a concave or convex shape is provided at the tip of the meat stealing piece to support the meat stealing piece, Injection molding that supports the meat stealing piece by supporting the meat stealing piece, which protrudes from the tip of the side protruding mold side or gate mold side blade and has a convex or concave shape for supporting the piece at the tip end A method of manufacturing a centrifugal fan. 前記ねじれた羽根形状において、ゲート金型側または突出金型側の中空部アンダーカット形状を形成させる為に、肉盗み駒を傾斜させて設け、スライドが動きアンダーカット部である中空部肉盗み形状から完全に駒を抜き、その後に製品取り出し面が開き製品を取り出すことを特徴とする請求項１１に記載の遠心ファンの製造方法。In the twisted vane shape, in order to form a hollow undercut shape on the gate mold side or on the protruding mold side, a meat stealing piece is provided at an angle, and the slide moves and the hollow steal shape is an undercut portion. 12. The method for manufacturing a centrifugal fan according to claim 11, wherein the piece is completely removed from the opening, and thereafter, the product take-out surface opens to take out the product. 前記肉盗み駒の傾斜に沿って、型開きを利用して動くスライドカム方式によりスライドさせて、アンダーカット形状を抜くことを特徴とする請求項１２に記載の遠心ファンの製造方法。The method for manufacturing a centrifugal fan according to claim 12, characterized in that the undercut shape is removed by sliding along a slope of the meat stealing piece by a slide cam method that moves using a mold opening. 前記肉盗み駒の傾斜に沿って、型開きに関係無しに単独で動かせる油圧シリンダー方式によりスライドさせて、アンダーカット形状を抜くことを特徴とする請求項１２に記載の遠心ファンの製造方法。13. The method according to claim 12, wherein the undercut shape is removed by sliding along the inclination of the stealing piece by a hydraulic cylinder system that can be moved independently of the mold opening. 前記ねじれた羽根形状外周の型が開いた際、アンダーカットで抜けない羽根形状を形成させる為、羽根の内、外面を外側にスライドさせる駒により形成させ、スライドは肉盗み形状駒が完全に抜けた後作動することを特徴とする請求項１１に記載の遠心ファンの製造方法。When the outer mold of the twisted blade shape is opened, the blade is formed by a piece that slides the inside and outside of the blade to the outside to form a blade shape that does not come off by undercut, and the slide completely comes off The method for manufacturing a centrifugal fan according to claim 11, wherein the method is operated after the operation. 遠心ファン本体とねじれた羽根形状とが一体成形される遠心ファンにおいて、
前記ねじれた羽根形状は、羽根形状高さ方向に全貫通の中空部を設けたことを特徴とする遠心ファン。In a centrifugal fan in which the centrifugal fan body and the twisted blade shape are integrally formed,
The centrifugal fan, wherein the twisted blade shape has a hollow portion that is entirely penetrated in the blade shape height direction.

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