JP2004298910A - Device and method for venting gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new method and device for venting gas, wherein a slit is maintained which only the gas is allowed to pass through, by making use of difference between the gas and molten metal. <P>SOLUTION: In the gas venting device 10 installed to a molding die B, the slit S having its center at the inlet 4a of a gas sucking passage 4 orthogonal to a die coupling part of a fixed die 1 and movable die 2, and a molten metal passage 3 continuously provided to a die cavity C are sequentially provided in the die coupling part. Thus, the gas venting method is characterized in that only the gas A is sucked through the whole circumference of the slit S, while the molten metal D is prevented from passing by the slit S. Further, the gas venting device is characterized in that the gas sucking passage 4 communicating with a vacuuming device F and orthogonal to the coupling part of both fixed and movable dies 1 and 2 is arranged in either the fixed die 1 or the movable die 2, and that a gas venting part 5 having its center at the inlet 4a of the gas sucking passage 4, in the die coupling part, is provided, and a molten metal passage 3 communicating with the cavity C is also provided at the periphery of the gas venting part 5. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、金型に取付けるガス抜き装置の新規ガス抜き方法と、そのガス抜き装置に関する。
【０００２】
【従来の技術】
金型を用いて高精密、高精度の製品を成形する場合、成形金型にガス抜き装置を介して吸引手段を接続し、金型キャビティから空気やガス等の気体を吸引することによって製品における巣の発生を防いだり、またキャビティの隅々まで材料が行き届くようにしていた。
ガス抜き装置として、特開２００２−２０５１４１の如く受動バルブや開閉バルブ等を備えたバルブ式ガス抜き装置（以下、バルブ式とする）と、特開２００１−２９３５４８と図２０の如く固定型３１と可動型３２との型接合部にジグザグの通気路３３を備えたチルベント式ガス抜き装置（以下、チルベント式とする）とが知られている。
【０００３】
【発明が解決しようとする課題】
バルブ式にあっては、溶融圧にて受動バルブを作動し、該バルブの作動を開閉バルブに伝え、開閉バルブを閉鎖するため、溶湯の吸引阻止効果が高いが、構成部品が多いため高価になるし、小型化に制限がある等の問題点があると共に、そのことにより成形金型への配置場所や配置数に制限を受けたり、取扱いにも高度の熟練を要する等の問題点があった。
他方、チルベント式にあっては、可動部品がなく、構成部品が少ないためバルブ式より小型化が可能で、安価に提供できるが、溶湯の吸い込み阻止が困難で、アルミカスの目詰まりを生じることもあるため、何等かの対策が必要であった。
【０００４】
何れのガス抜き装置も、金型キャビティから真空装置によって気体を吸引した際、溶湯の通過を阻止しながら気体のみの通過を自由にするものであるが、一長一短があった。
そこでこの本発明は、従来技術の備える問題点に鑑みてなされたものであり、その目的とするところは、気体と溶湯との違いを利用し、気体のみ通過し得るスリットの維持を可能にした新規ガス抜き方法とガス抜き装置を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、本発明の金型におけるガス抜き装置のガス抜き方法は、成形金型に取付けるガス抜き装置において、固定型と可動型との型接合部にガス吸引路のガス入口部を直交して設け、型締め時に、ガス入口部を中心として、ガス入口部より外側に溶湯の通過を阻止し気体の通過を可能にする環状スリットと、金型キャビティに連続する溶湯路とを順に形成し、環状スリットにより溶湯の通過を阻止しながら環状スリットの全周より気体のみを吸引し得るようにしたことを特徴とする。
【０００６】
ここで金型キャビテイとは、固定金型と可動金型との間に設ける製品形成空間で、鋳造金型、ダイキャスト金型、射出成形金型等に設けるものを言い、気体とは、成形金型の型締めによりキャビテイ内に閉じ込められる空気、及びキャビテイ内に充填された溶湯から発生するガス等を言う。
ガス抜き装置とは、成形金型の可動金型に取付ける可動型と、固定金型に取付ける固定型とから成り、成形金型と同時に開閉され、型閉め時にキャビテイ内からの気体の吸引を可能にし、溶融の吸い込みを防ぐ目的で用いる。
ここでガス吸引路とは、溶湯路と真空装置に連通し、気体の通過を可能にするものを言い、環状スリットとは、型締め時にガス入口部を中心として、ガス入口部より外側に形成され、溶湯より粘性が小さく微細な気体の通過を可能にする隙間を言い、気体より粘性が強く粒子の大きな溶湯の通過を阻止するものを言う。
【０００７】
また本発明のガス抜き装置は、固定型と可動型との何れか一方に、真空装置Ｆに連通するガス吸引路を両型の型接合部に直交して設け、型接合部にガス吸引路のガス入口部を中心とするガスベント部と、キャビティに連通しガスベント部を取囲む溶湯路とを備えていることを特徴とする。
請求項３として、請求項２のガス抜き装置において、ガスベント部は、固定型と可動型との一方型より他方型接合面に向けて突出する球面部をガス吸引路のガス入口部より大きく、且つガス入口部を中心にして設け、型締め時に、球面部の頂部と他方型接合面との間に環状スリットを形成する。
【０００８】
請求項４として、請求項２のガス抜き装置において、ガスベント部は、固定型と可動型との一方型に、他方型接合面と相対する対抗面をガス吸引路のガス入口部より大きく、且つガス入口部を中心にして設け、対抗面の外周側に環状突条を設け、型締め時に、環状突条と他方型接合面との間に環状スリットを形成する。請求項５として、請求項３，４のガス抜き装置において、固定型と可動型との一方型に、他方型に向けて往復動する摺動体と、摺動体を他方型に向けて押圧する押圧体とを備え、摺動体は他方型側にガスベント部を備え、型締め時に押圧体を加圧し、型開き時に、加圧されていた押圧体の反力により一方型接合面から先部を外部に突出する。
請求項６として、請求項５のガス抜き装置において、環状突条より内周側に対抗面と他方型接合面との一方側面に向けて突出する間隔保持部を備え、型締め時に、一方側面と間隔保持部とが当接し、環状突条と一方側面との間に環状スリットを形成する。
【０００９】
請求項７として、請求項４のガス抜き装置において、固定型と可動型との一方型に、他方型に向けて往復動する摺動体と、摺動体を他方型に向けて押圧する押圧体とを備え、摺動体はガスベント部の外周側に環状突条を備えると共に、環状突条の外側に溶湯路と間隔保持部とを順に備え、型締め時に、間隔保持部が他方型接合面に当接し、環状突条と他方型接合面との間に環状スリットを形成する。
【００１０】
請求項８として、請求項３，４，５，６，７のガス抜き装置において、環状スリットは、ガス吸引路のガス入口部を中心とし、ガス入口部より広範囲に形成され、溶湯の通過を阻止し気体の通過を可能にする。
請求項９として、請求項５，６，７，８のガス抜き装置において、押圧体が弾力性を有する合成樹脂の弾性体である。
請求項１０として、請求項２，４，５，６，８，９のガス抜き装置において、溶湯の流入方向に第一ガスベント部と第二ガスベント部とを一定間隔で備え、各ガスベント部に対してガス入口部を各々直交している。
【００１１】
請求項１１として、請求項２〜１０記載の何れか１のガス抜き装置において、溶湯路は金型キャビティに連通する湯流入路と、湯流入路に連通しガスベント部を取囲む湯周回路とから成る。
請求項１２として、請求項１１のガス抜き装置において、湯周回路の路断面積が湯流入路側より先部側に向けて小さくなる。
【００１２】
【発明の実施の形態】
先ず、本発明によるガス抜き方法とガス抜き装置の基本形態を図１〜図３に基づき説明すれば、成形金型ＢのキャビティＣから気体Ａ（キャビティＣ内の空気と、キャビティＣに充填された溶湯ガス）を真空装置Ｆによって吸引する際、溶湯Ｄやその不要固化物（アルミカス等）が真空装置Ｆへ吸引されないようにするものであり、その目的は、従来のバルブ式及びチルベント式と同様である。
成形金型Ｂは固定金型Ｂ１と可動金型Ｂ２との間にキャビティＣを形成し、ガス抜き装置１０は成形金型Ｂの固定金型Ｂ１に取付ける固定型１と、可動金型Ｂ２に取付ける可動型２とから成り、真空装置Ｆに連通するガス吸引路４と、キャビティＣに連通する溶湯路３とを備えている。
【００１３】
次いで、本発明によるガス抜き方法とガス抜き装置の第一実施形態を図４と図５に基づき説明すれば、固定型１と可動型２との型接合部にガスベント部５を備え、ガスベント部５から真空装置Ｆに連通するガス吸引路４と、ガスベント部５の外側に金型キャビティＣに連通する溶湯路３とを備え、溶湯路３は金型キャビティＣに連通する湯流入路３ａと、分岐部３０により二方向に分かれ球面部７を取囲む湯周回路３ｂとを備え、ガス吸引路４はガスベント部５に直交するガス入口部４ａと、ガス入口部４ａに連通し固定型接合面１ａに平行するガス出口部４ｂとから成り、ガスベント部５は可動型２に固定型接合面１ａに向けて突出する球面部７を、ガス入口部４ａを中心としてガス入口部４ａより広範囲に形成し、型締め時に、固定型接合面１ａと可動型接合面２ａとが当接し、球面部７の頂部７ａと固定型接合面１ａとの間に溶湯Ｄの通過を阻止し気体Ａの通過を可能にする環状スリットＳを形成する。
【００１４】
第一実施形態のガス抜き装置１０を成形金型Ｂに取付ける際、図１の如く可動型２の設置面２ｂと成形金型Ｂとの間に、可動型２を固定型１に向けて押圧する押圧体９を介在し、固定型接合面１ａと可動型接合面２ａとが確実に当接し、環状スリットＳを常に一定に保ち得るようにしておく。
真空装置Ｆを作動し、成形金型Ｂを型締めすると、成形金型Ｂに取付けた固定型１の型接合面１ａと可動型２の型接合面２ａとが当接し、型接合部に直交するガス入口部４ａを中心にしてガスベント部５の球面部７と湯周回路３ｂとが位置し、球面部７の頂部７ａと固定型接合面１ａとの間に環状スリットＳを形成する。型締め状態において成形金型ＢのキャビティＣ内に溶湯Ｄを圧入し、キャビティＣからガス抜き装置１０を介して気体Ａを吸引すると、気体Ａは溶湯路３の湯流入路３ａより湯周回路３ｂに流入し、球面部７の全周から中心に向けて流入し（球面部７の中心に位置するガス入口部４ａから吸引しているため）、環状スリットＳを通過してガス吸引路４から真空装置Ｆに吸引される。
一方、溶湯Ｄは気体Ａより流動性が悪いので、気体Ａより遅れて溶湯路３の湯流入路３ａより湯周回路３ｂに至り、湯周回路３ｂの全周から球面部７の中心に向けて流れるが、気体Ａより粒子が大きいので環状スリットＳを通過することができず、環状スリットＳの手前で留まる。
【００１５】
本発明によるガス抜き装置の第二実施形態を、第一実施形態と相違する点について説明すると、図６と図１０の如く可動型２に型接合面２ａから設置面２ｂに貫通する貫通孔２０を設け、貫通孔２０に摺動体８を往復動可能に備え、摺動体８の頭部側にガスベント部５を、尾部側に摺動体８を突出方向に押圧する押圧体９を備え、且つ摺動体８の外側に湯流入路３ａに連続する湯周回路３ｂと、固定型接合面１ａに向けて突出する間隔保持部１６とを順に設け、ガスベント部５は固定型接合面１ａに向けて突出する球面部７を備え、型締め時に、先ず摺動体８の間隔保持部１６が固定型接合面１ａに当接し、当接状態において押圧体９を加圧しながら降下し、球面部７の頂部７ａと固定型接合面１ａとの間に溶湯Ｄの通過を阻止し気体Ａの通過を可能にする環状スリットＳを形成し、型開き時に、押圧体９の反発力により摺動体８の頭部を可動型接合面２ａより外部に突出するものである。
【００１６】
本発明によるガス抜き装置の第三実施形態を、第一実施形態と相違する点について説明すると、図７と図８の如く可動型２にガス吸引路４のガス入口部４ａを中心とするガスベント部５と、その外側に溶湯路３の湯流入路３ａに連通する湯周回路３ｂとを設け、ガスベント部５は固定型接合面１ａに相対する対抗面５ａの外側に環状突条６を備え、型締め時に、固定型接合面１ａと可動型接合面２ａとが当接し、環状突条６と固定型接合面１ａとの間に溶湯Ｄの通過を阻止し気体Ａの通過を可能にする環状スリットＳを形成し、環状スリットＳを取囲む湯周回路３ｂの全周からガス入口部４ａへの気体Ａの流入を可能にし、溶湯Ｄの流入を阻止する。
【００１７】
本発明によるガス抜き装置の第四実施形態を、第二及び第三実施形態と相違する点について説明すると、図９の如く可動型２にガスベント部５を備えた摺動体８を往復動可能に嵌挿し、可動型２の設置面２ｂ側に、摺動体８を突出方向に押圧する押圧体９を備えると共に、摺動体８の外側に湯流入路３ａに連続する湯周回路３ｂを備え、ガスベント部５は固定型接合面１ａに相対する対抗面５ａを備え、対抗面５ａの外周部にガス入口部４ａを中心とする環状突条６を、環状突条６より内周側の数箇所に間隔保持部１６を分散して設け、型締め時に、先ず摺動体８の間隔保持部１６が固定型接合面１ａに当接して、当接状態において押圧体９を加圧しながら降下し、環状突条６と固定型接合面１ａとの間に溶湯Ｄの通過を阻止し気体Ａの通過を可能にする環状スリットＳを形成し、型開き時に、押圧体９の反発力により摺動体８の頭部を可動型接合面２ａより外部に突出するものである。
【００１８】
本発明によるガス抜き装置の第五実施形態を、第四実施形態と相違する点について説明すると、図１２の如く摺動体８にガスベント部５と湯周回路３ｂとを備えるものであり、ガスベント部５は固定型接合面１ａに相対する対抗面５ａに、ガス入口部４ａを中心とする環状突条６を設けると共に、その外側に湯流入路３ａに連続する湯周回路３ｂと間隔保持部１６と順に設け、間隔保持部１６と環状突条６との間に湯周回路３ｂを形成し、型締め時に、間隔保持部１６が固定型接合面１ａに当接して、環状突条６と固定型接合面１ａとの間に溶湯Ｄの通過を阻止し気体Ａの通過を可能にする環状スリットＳを形成し、型開き時に、摺動体８の頭部を可動型接合面２ａより外部に突出するものである。
【００１９】
第三及び第四実施形態のガス抜き装置は上記の通りであるから、予め、成形金型Ｂに取付け、真空装置Ｆを連通し、真空装置Ｆと鋳造機を作動する。
固定金型Ｂ１と可動金型Ｂ２を型締めし、成形金型ＢのキャビティＣに溶湯Ｄを圧入すれば、キャビティＣ内の気体Ａは図８の如く湯流入路３ａからガスベント部５を取囲む湯周回路３ｂに至り、環状スリットＳを通過して真空装置Ｆに吸収されるが、溶湯路３に流れ込んだ溶湯Ｄは、湯流入路３ａから湯周回路３ｂに至るも、環状スリットＳを通過することができないので、ガス吸引路４へ流入することはない。
第四実施形態のガス抜き装置にあっては、溶湯ＤがキャビティＣと溶湯路３で固化した後、固定金型Ｂ１と可動金型Ｂ２とを型開きすれば、固定型１と可動型２も図９（イ）の如く同時に型開きされ、その型開きによって、先ず摺動体８が押圧体９により可動型接合面２ａより突出し、溶湯路３等で固化した不要固化物を外部に押し出す。不要固化物は、キャビティＣにより形成された製品と一体を成しているので、製品と共に押出される。
【００２０】
本発明によるガス抜き装置の第六実施形態を、第四及び第五実施形態と相違する点について説明すると、図１５の如く可動型２に摺動体８と、摺動体８を取囲む溶湯路３の湯周回路３ｂと、二方向〜四方向より湯周回路３ｂに至る第一湯流入路１３ａと第二湯流入路２３ａと第三湯流入路３３ａとを設け、必要に応じて第一湯流入路１３ａと第二湯流入路２３ａとの間、第二湯流入路２３ａと第三湯流入路３３ａとの間に補助湯路３ｃを設け、摺動体８にガス入口部４ａを中心とした環状突条６を備え、摺動体８の頭部にガスベント部５を形成するもので、このガス抜き装置１０は図１６の如くリング状製品の鋳造時に、リング状キャビティＣ１より内周側に配置し、該キャビティＣ１からガス抜き装置１０に至る溶湯路３を分散して備える。
【００２１】
本発明によるガス抜き装置の第七実施形態を、第一〜第六実施形態と相違する点について説明すると、図１７の如く溶湯Ｄの流入側からガス吸引側に向けて第一ガスベント部１５と第二ガスベント部２５とを一定間隔で備え、溶湯路３の湯周回路３ｂを両ガスベント部１５，２５に跨って備え、第一ガスベント部１５にガス吸引路４の第一ガス入口部１４ａを直交して備えると共に、第二ガスベント部２５にも第二ガス入口部２４ａを直交して備え、第一ガス入口部１４ａと第二ガス入口部２４ａとをガス出口部４ｂに連通している。
【００２２】
【実施例】
可動型２に摺動体８を備える場合、貫通孔２０を主孔部２１と、主孔部２１より大径の副孔部２２とから形成し、摺動体８を主孔部２１に嵌挿する摺胴部８ａと、副孔部２２に嵌挿する摺裾部８ｂとから形成すると、摺動体８の突出を制限することができる。また、摺動体８の尾部側に下降方向に開口する凹部１８を備え、凹部１８と成形金型Ｂとの間に押圧体９を備えることも可能である。
第六実施形態のガス抜き装置において、第一ガスベント部１５と第二ガスベント部２５とを、溶湯Ｄの流入方向に並列して配置することも可能である。
【００２３】
図１８のガス抜き装置は、第四実施形態の類型であり、摺動体８の外側に湯流入路３ａに連続する湯周回路３ｂを設け、摺動体８のガスベント部５は固定型接合面１ａに相対する対抗面５ａの外周部に、ガス入口部４ａを中心とする環状突条６を備え、固定型接合面１ａに対抗面５ａに向けて突出する間隔保持部１６を設け、型締め時に、間隔保持部１６が対抗面５ａに当接して、環状突条６と固定型接合面１ａとの間に環状スリットＳを形成するものであり、第四実施形態のガス抜き装置と略同様の目的を達成する。
【００２４】
湯周回路３ｂは図１３の如く、路幅ｈを湯流入路３ａ側より先部側に向けて狭くするか、路深さｔを湯流入路３ａ側より先部側に向けて浅くし、或いは路幅ｈと路深さｔとを湯流入路３ａ側より先部側に向けて小さくすると、ガスベント部５の全周から中心部に位置するガス入口部４ａへの気体Ａの流入を均等化し得る利点がある。
押圧体９は摺動体８の往復動（数ｍｍ以内）を可能にする反発力や弾力性を有するものであれば、材質や形状は自由であるが、図１９の如く皿バネ１９や合成樹脂の弾性体２９を用いることが好ましい。
【００２５】
摺動体８を用いるガス抜き装置１０にあっては、摺動体８に対する潤滑手段Ｇを備えると、摺動体８の動きを長く滑らかに保つことができる。また、摺動体８は型開き時に可動型接合面２ａから外部に突出するので、例えガスベント部５に溶湯Ｄが流れ込んで固化しても、型開き時に自動的に排出することができる。その結果、型締め時に常に正常な環状スリットＳを維持することができる。
実施形態にあっては、ガス吸引路４を固定型１に設けているが、可動型２に設けることも可能であるし、摺動体８と押圧体９を貫通するように設けることも可能である。
また、溶湯路３の湯周回路３ｂはガスベント部５の全周に形成され、ガスベント部５を取囲んでいるが、湯流入路３ａの対抗先部において切り離れていても略目的を達成する。
【００２６】
ガスベント部５の環状突条６と間隔保持部１６は、固定型１と可動型２との一方型１１、又は他方型１２の何れに設けることも可能であるが、一方型１１と他方型１２に分けて設けることも可能である。また、ガス吸引路４も一方型１１と他方型１２の何れに設けることも可能である。
分岐部３０は、湯流入路３ａから湯周回路３ｂへの分岐を容易にし、湯流入路３ａから環状突条６への溶湯Ｄ、及び気体Ａの直接的な流入を避ける効果を有するが、必ず必要とするものではなく、第六実施形態の如く湯流入路３ａを二方向〜四方向に分散して設ける場合、省略することも可能である。
【００２７】
溶湯路３の流入部３ａや湯周回路３ｂ等で固化した不要固化物を、型開き時に押出しピンＰで排出することも可能である。
環状スリットＳの隙間として採用できる範囲は、０．１〜０．０５ｍｍであり、望ましい範囲は０．０９〜０．０６ｍｍであり、最適な範囲は０．０８〜０．０７ｍｍである。隙間が０・１ｍｍより広くなると溶湯Ｄが通過し、隙間を小さくするほど溶湯Ｄの通過を阻止し得るが、気体Ａの通過抵抗が増大し、吸引量が減少する。これを補うには、吸引力を高めるか、スリットの範囲を増大する必要がある。
本発明では、ガス入口部４ａを中心として環状スリットＳを形成し、該スリットＳの全周から吸引するので、量的にカーバーできる。
環状突条６にて形成する環状スリットＳは、球面部７の頂部７ａで形成する環状スリットＳより大きいので、その分、多くの気体Ａを吸引し得る。
【００２８】
本発明は環状スリットＳを長く一定に保つ点に特徴を有するもので、そのために固定型１と可動型２との当接精度等を高める必要があり、固定型１と可動型２との当接精度を高めることに成功すると共に、可動型２に摺動体８を備え、固定型１と摺動体８とを当接し得るようにし、当接精度の一段なる向上に成功したものである。
環状スリットＳを保つための間隔保持部１６は、当接強度と高温ガスとに耐える程度で十分であり、その成形範囲が少ないほど当接精度の維持が容易になる。
【００２９】
【発明の効果】
本発明によるガス抜き装置のガス抜き方法は上記の通りであるから、次に記載する効果を奏する。
ガス吸引路のガス入口部を中心として、ガス入口部より外側に溶湯の通過を阻止し気体の通過を可能にする環状スリットを備え、その外側に金型キャビティに連続する溶湯路を備えているので、溶湯の通過を阻止しながら環状スリットの全周より効率的に気体のみを吸引し得る。即ち、真空装置へのアルミカス等の流入を阻止することができる。
【００３０】
また、本発明によるガス抜き装置は上記の通りであるから、次に記載する効果を奏する。
ガス抜き装置は、型接合部に直交するガス吸引路を設け、そのガス入口部を中心としてガスベント部と、キャビティに連通しガスベント部を取囲む溶湯路とを備えているので、ガスベント部の全周からガスを吸引することができる。その結果、バルブ式に比較して小型軽量化が可能となり、メンテナンスや取扱い操作等も簡略になるばかりか、安価に提供し得る。
特に、キャビティの形状が複雑化しても任意位置に設けることができるので、ガス排出路を短縮化し、容易にガス抜きができる。
【００３１】
請求項３に記載のガス抜き装置は、請求項２の効果に加えて、ガスベント部はガス吸引路のガス入口部を中心とし、且つガス入口部より大きい球面部を設け、型締め時に、球面部の頂部と他方型接合面との間に環状スリットを形成するので、溶湯から球面部に溶湯が流入しても環状スリットで阻止し得る。また、可動部品がないのでメンテナンスも不要であるし、直線的にジグザクの通気路を設けるチルベント式より小型化も可能である。
請求項４に記載のガス抜き装置は、請求項２の効果に加えて、ガスベント部はガス吸引路のガス入口部を中心とし、且つガス入口部より大きい対抗面の外周側に環状突条を設け、型締め時に、環状突条と他方型接合面との間に環状スリットを形成するので、溶湯からガス入口部に向けて気体を吸引しても、環状スリットで溶湯の流入を阻止し得る。請求項３より環状スリットの形成範囲を大きくし得るので、その分、気体を多量に吸引し得る。
【００３２】
請求項５に記載のガス抜き装置は、請求項３，４の効果に加えて、摺動体にガスベント部を備え、摺動体を押圧体にて突出方向に押圧しているので、環状スリットをガス抜きに最適な状態に長く保つことができる。例えガスベント部にアルミカスが付着しても、これを自然に排出して正常な状態を長く保つことができる。その結果、目詰まりによる製品不良の発生を未然に防止し、歩留まりを向上し得るばかりか、ガス抜き装置の損傷も防げる。また、摺動体は型締めと押圧体にて微動する程度であるから、外部からの作動が不要で、メンテンスも不要になる。しかも成形サイクルを高速化してもメカトラブルの発生も少ない。
請求項６に記載のガス抜き装置は、請求項５の効果に加えて、間隔保持部を環状突条の内周側に備えるので、環状スリットを維持するための当接面積が他より小さく、その分、当接精度を高めることができる。例え間隔保持部の高さに誤差が生じても、調整が少なくてすむし、その結果、環状スリットの維持に顕著な効果を奏する。
【００３３】
請求項７に記載のガス抜き装置は、請求項４の効果に加えて、摺動体にガスベント部の環状突条を備えると共に、その外側に溶湯路と間隔保持部とを備えているので、例え溶湯路にて溶湯が固化しても、個化した余剰部材によって摺動体の往復動が阻害されることが少ない。
【００３４】
請求項８に記載のガス抜き装置は、請求項３，４，５，６，７の効果に加えて、環状スリットはガス吸引路のガス入口部を中心とし、ガス入口部より外側に形成されているので、ガス入口部からガスを吸引しても、環状スリットによって溶湯の通過を阻止し、気体のみを吸引することができる。
請求項９に記載のガス抜き装置は、請求項５，６，７，８の効果に加えて、押圧体が合成樹脂の弾性体であるから、長期使用しても破損が少なく、しかも取扱いも容易である。
請求項１０に記載のガス抜き装置は、請求項２，４，５，６，８，９の効果に加えて、第一ガスベント部と第二ガスベント部とを備えているので、キャビティ容量の大きな鋳造にも対応し得る。
【００３５】
請求項１１に記載のガス抜き装置は、請求項２〜１０記載の何れか１の効果に加えて、溶湯路の湯湯周回路はガスベント部を取囲むので、ガスベント部の全周から中心に位置するガス入口部に向けて気体を効率よく吸引することができる。請求項１２に記載のガス抜き装置は、請求項１１の効果に加えて、湯湯周回路の路断面積が湯湯流入路側より先部側に向けて小さくなるので、溶湯の通過抵抗が均一化し、環状スリット全周から気体を均等に吸引し得る。
【図面の簡単な説明】
【図１】本発明によるガス抜き方法とガス抜き装置を用いた鋳造手段の概略図である。
【図２】本発明によるガス抜き装置を取付けた成形金型の概略断面図である。
【図３】（イ）（ロ）ガス抜き装置の固定型と可動型の取付け例を示す概略平面図である。
【図４】（イ）（ロ）本発明のガス抜き方法とガス抜き装置の第一実施形態における型開き時の概略断面図と型締め時の要部拡大断面図である。
【図５】（イ）（ロ）（ハ）第一実施形態の固定型と可動型の概略平面図、及び気体の流れ図である。
【図６】（イ）（ロ）第二実施形態における型開き時の概略断面図と型締め時の要部拡大断面図である。
【図７】（イ）（ロ）第三実施形態における型開き時の概略断面図と型締め時の要部拡大断面図である。
【図８】（イ）（ロ）（ハ）第三実施形態の固定型と可動型の概略平面図、及び気体の流れ図である。
【図９】（イ）（ロ）第四実施形態における型開き時の概略断面図と型締め時の要部拡大断面図である。
【図１０】第二実施形態における可動型の平面図である。
【図１１】第四実施形態における可動型の平面図である。
【図１２】（イ）（ロ）第五実施形態における型開き時の概略断面図と型締め時の要部拡大断面図である。
【図１３】周回路の拡大断面図である。
【図１４】第五実施形態における可動型の平面図である。
【図１５】第六実施形態における可動型の概略平面図である。
【図１６】第六実施形態のガス抜き装置における使用例を示す金型平面図である。
【図１７】（イ）（ロ）第七実施形態におけるガス抜き装置の固定型と可動型の概略平面図である。
【図１８】（イ）（ロ）類例第四実施形態における型開き時の概略断面図と型締め時の要部拡大断面図である。
【図１９】（イ）（ロ）押圧体の使用例を示すガス抜き装置の概略断面図である。
【図２０】（イ）（ロ）（ハ）従来チルベント式ガス抜き装置の使用例を示す要部概略図と、該装置の固定型と可動型の概略平面図である。
【符号の説明】
１０ ガス抜き装置
１ 固定型、１ａ 型接合面
２ 可動型、２ａ 型接合面、２ｂ 設置面
１１ 一方型、１１ａ 一方型接合面、１２ 他方型、１２ａ 他方型接合面
３ 溶湯路
３ａ，１３ａ，２３ａ，３３ａ 流入路、３ｂ 周回路、３ｃ 補助路
４ ガス吸引路、４ａ，１４ａ，２４ａ 入口部、４ｂ 出口部
５，１５，２５ ガスベント部、５ａ 対抗面
６ 環状突条、１６ 間隔保持部
７ 球面部、７ａ 頂部
８ 摺動体、８ａ 主摺部、８ｂ 副摺部、１８ 凹部
９ 押圧体、１９ 皿バネ、２９ 弾性体
２０ 貫通孔、２１ 主孔部、２２ 副孔部
３０ 分岐部
Ｓ スリット
Ａ 気体
Ｂ 成形金型、Ｂ１ 固定金型、Ｂ２ 可動金型
Ｃ，Ｃ１ キャビティ
Ｄ 溶湯
Ｆ 真空装置
Ｇ 潤滑手段
Ｐ 押出ピン
ｈ 路幅、ｔ 路深さ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a new degassing method for a degassing device attached to a mold, and to the degassing device.
[0002]
[Prior art]
When molding high-precision, high-precision products using a mold, a suction means is connected to the molding die via a degassing device, and a gas such as air or gas is sucked from the mold cavity. They prevented nesting and ensured that the material reached every corner of the cavity.
As a degassing device, a valve-type degassing device provided with a passive valve, an open / close valve and the like as in JP-A-2002-205141 (hereinafter, referred to as a valve type) and a fixed type 31 as shown in JP-A-2001-293548 and FIG. A chill vent type gas venting device (hereinafter, referred to as a chill vent type) having a zigzag ventilation path 33 at a mold joint with a movable mold 32 is known.
[0003]
[Problems to be solved by the invention]
In the valve type, the passive valve is operated by the melting pressure, the operation of the valve is transmitted to the open / close valve, and the open / close valve is closed. In addition, there are problems such as a limitation in miniaturization, and thus, there are problems such as restrictions on the arrangement place and number of arrangements in the molding die and a high level of skill in handling. Was.
On the other hand, the chill vent type has no moving parts and has few components, so it can be smaller than the valve type and can be provided at low cost.However, it is difficult to prevent the suction of the molten metal, and aluminum clogging may occur. Therefore, some countermeasures were necessary.
[0004]
Each of the degassing devices, when sucking a gas from the mold cavity by a vacuum device, allows the passage of only the gas while preventing the passage of the molten metal, but has advantages and disadvantages.
Therefore, the present invention has been made in view of the problems of the prior art, and an object of the present invention is to make use of the difference between gas and molten metal, and to maintain a slit through which only gas can pass. It is to provide a new degassing method and a degassing device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a gas venting method for a gas venting device in a mold according to the present invention is directed to a gas venting device attached to a molding die, wherein a gas inlet of a gas suction passage is provided at a joint between a fixed mold and a movable mold. Parts are provided orthogonally, and at the time of mold clamping, around the gas inlet portion, an annular slit that prevents passage of the molten metal to the outside of the gas inlet portion and allows gas to pass therethrough, and a molten metal passage that is continuous with the mold cavity. Are formed in order, and only the gas can be sucked from the entire circumference of the annular slit while preventing the passage of the molten metal by the annular slit.
[0006]
Here, the mold cavity is a product forming space provided between a fixed mold and a movable mold, and means a product cavity provided in a casting mold, a die casting mold, an injection molding mold, and the like. Air trapped in the cavity by mold clamping, gas generated from the molten metal filled in the cavity, and the like.
The degassing device consists of a movable mold attached to the movable mold and a fixed mold attached to the fixed mold.It is opened and closed at the same time as the mold, allowing gas to be sucked from the cavity when the mold is closed. And used for the purpose of preventing inhalation of melt.
Here, the gas suction passage means a passage communicating with the molten metal passage and the vacuum device to allow gas to pass therethrough, and the annular slit is formed outside the gas inlet portion around the gas inlet portion at the time of mold clamping. A gap that has a smaller viscosity than the molten metal and allows a fine gas to pass therethrough, and a gap that has a higher viscosity than the gas and prevents the passage of a large particle of the molten metal.
[0007]
Further, in the gas venting device of the present invention, a gas suction passage communicating with the vacuum device F is provided at one of the fixed mold and the movable mold so as to be orthogonal to the mold joints of both the molds. A gas vent section centered on the gas inlet section and a molten metal passage communicating with the cavity and surrounding the gas vent section.
According to a third aspect of the present invention, in the gas venting device of the second aspect, the gas vent portion has a spherical portion protruding from one of the fixed mold and the movable mold toward the other mold joining surface larger than the gas inlet of the gas suction path, Further, an annular slit is formed between the top of the spherical portion and the other mold joining surface when the mold is clamped.
[0008]
As a fourth aspect, in the gas venting device according to the second aspect, the gas vent portion is larger in the one surface of the fixed type and the movable type than the gas inlet portion of the gas suction path, and the opposing surface is opposite to the joining surface of the other type. An annular ridge is provided around the gas inlet portion, an annular ridge is provided on the outer peripheral side of the opposing surface, and an annular slit is formed between the annular ridge and the other mold joining surface during mold clamping. According to a fifth aspect of the present invention, in the gas venting device of the third and fourth aspects, a sliding body reciprocatingly moves toward one of the fixed mold and the movable mold toward the other mold, and pressing the sliding body toward the other mold. The sliding body has a gas vent portion on the other mold side, presses the pressing body at the time of mold clamping, and at the time of opening the mold, the tip part from the one mold joining surface is externally moved by the reaction force of the pressed body being pressed. Protrude into.
According to a sixth aspect of the present invention, there is provided the gas venting device according to the fifth aspect, further comprising: a space holding portion projecting from the annular ridge to the inner peripheral side toward one side of the opposing surface and the other mold joining surface. And the space holding portion are in contact with each other to form an annular slit between the annular ridge and one side surface.
[0009]
According to a seventh aspect of the present invention, in the gas venting device of the fourth aspect, a sliding body that reciprocates toward one of a fixed mold and a movable mold, and a pressing body that presses the sliding body toward the other mold. The sliding body is provided with an annular ridge on the outer peripheral side of the gas vent portion, and is provided with a molten metal path and a gap holding portion in order outside the annular ridge, and the gap holding portion contacts the other mold joining surface during mold clamping. And an annular slit is formed between the annular ridge and the other mold joining surface.
[0010]
According to an eighth aspect of the present invention, in the gas venting device of the third, fourth, fifth, sixth, and seventh aspects, the annular slit is formed to be wider than the gas inlet part around the gas inlet part of the gas suction passage, and to allow passage of the molten metal. Block and allow the passage of gas.
According to a ninth aspect, in the degassing device according to the fifth, sixth, seventh, and eighth aspects, the pressing body is an elastic body made of synthetic resin having elasticity.
According to a tenth aspect, in the gas venting device of the second, fourth, fifth, sixth, eighth, and ninth aspects, a first gas vent portion and a second gas vent portion are provided at regular intervals in the inflow direction of the molten metal. The gas inlets are orthogonal to each other.
[0011]
According to an eleventh aspect, in the gas degassing device according to any one of the second to tenth aspects, the molten metal path includes a molten metal inflow path that communicates with the mold cavity, and a molten metal circuit that communicates with the molten metal inflow path and surrounds the gas vent portion. Consists of
According to a twelfth aspect, in the gas degassing device of the eleventh aspect, the cross-sectional area of the hot water circulation circuit decreases toward the front end side from the hot water inflow passage side.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the basic mode of the degassing method and the degassing device according to the present invention will be described with reference to FIGS. 1 to 3. The gas A (the air in the cavity C and the gas filled in the cavity C) are injected from the cavity C of the molding die B. When the molten metal gas is sucked by the vacuum device F, the molten metal D and unnecessary solidified substances (such as aluminum scum) are prevented from being sucked into the vacuum device F. The purpose is to use the conventional valve type and chill vent type. The same is true.
The molding die B forms a cavity C between the fixed die B1 and the movable die B2, and the degassing device 10 includes the fixed die 1 attached to the fixed die B1 of the molding die B and the movable die B2. It comprises a movable mold 2 to be mounted, and has a gas suction path 4 communicating with the vacuum device F and a molten metal path 3 communicating with the cavity C.
[0013]
Next, a first embodiment of a degassing method and a degassing device according to the present invention will be described with reference to FIGS. 4 and 5. A gas vent portion 5 is provided at a mold joining portion between a fixed die 1 and a movable die 2. 5 is provided with a gas suction path 4 communicating with the vacuum device F, and a molten metal path 3 communicating with the mold cavity C outside of the gas vent portion 5, and the molten metal path 3 has a molten metal inflow path 3a communicating with the mold cavity C. A gas circulation path 3b which is divided in two directions by a branch portion 30 and surrounds the spherical portion 7; the gas suction passage 4 communicates with the gas inlet portion 4a orthogonal to the gas vent portion 5; A gas outlet portion 4b parallel to the surface 1a, and the gas vent portion 5 extends the spherical portion 7 protruding toward the fixed joining surface 1a on the movable mold 2 from the gas inlet portion 4a to a wider area than the gas inlet portion 4a. Forming and closing the mold The surface 1a and the movable joint surface 2a are in contact with each other, and an annular slit S is formed between the top 7a of the spherical portion 7 and the fixed joint surface 1a, which prevents the molten metal D from passing and allows the gas A to pass. .
[0014]
When attaching the degassing device 10 of the first embodiment to the molding die B, the movable die 2 is pressed toward the stationary die 1 between the installation surface 2b of the movable die 2 and the molding die B as shown in FIG. The fixed-type joining surface 1a and the movable-type joining surface 2a surely come into contact with each other with the pressing body 9 interposed therebetween, so that the annular slit S can always be kept constant.
When the vacuum apparatus F is operated and the molding die B is clamped, the die joining surface 1a of the fixed die 1 attached to the molding die B and the die joining surface 2a of the movable die 2 come into contact with each other, and are orthogonal to the die joint. The spherical portion 7 of the gas vent portion 5 and the molten metal circuit 3b are located around the gas inlet portion 4a, and an annular slit S is formed between the top portion 7a of the spherical portion 7 and the fixed joining surface 1a. When the molten metal D is press-fitted into the cavity C of the molding die B in the clamped state, and the gas A is sucked from the cavity C through the degassing device 10, the gas A flows from the molten metal inflow path 3 a of the molten metal path 3 into the molten metal circuit. 3b, flows toward the center from the entire circumference of the spherical portion 7 (since it is sucked from the gas inlet portion 4a located at the center of the spherical portion 7), passes through the annular slit S, and passes through the gas suction passage 4 From the vacuum device F.
On the other hand, since the molten metal D has a lower fluidity than the gas A, the molten metal D reaches the molten metal circuit 3b from the molten metal inflow path 3a of the molten metal path 3 later than the gas A, and extends from the entire circumference of the molten metal circuit 3b toward the center of the spherical portion 7. However, since the particles are larger than the gas A, they cannot pass through the annular slit S and stay in front of the annular slit S.
[0015]
The second embodiment of the degassing device according to the present invention will be described with respect to differences from the first embodiment. As shown in FIGS. 6 and 10, a through hole 20 penetrates the movable mold 2 from the mold joining surface 2a to the installation surface 2b. The sliding body 8 is provided in the through hole 20 so as to be able to reciprocate, the gas vent portion 5 is provided on the head side of the sliding body 8, and the pressing body 9 is provided on the tail side for pressing the sliding body 8 in the protruding direction. On the outer side of the moving body 8, a molten metal circuit 3b continuous with the molten metal inflow path 3a and a spacing member 16 protruding toward the fixed joint surface 1a are sequentially provided, and the gas vent portion 5 protrudes toward the fixed joint surface 1a. When the mold is clamped, the spacing member 16 of the sliding member 8 first comes into contact with the fixed mold joining surface 1a, and in the contact state, descends while pressing the pressing body 9 to press the top portion 7a of the spherical portion 7. The passage of the molten metal D is prevented between the fixed joint surface 1a and the Forming an annular slit S that allows, during mold opening, it is for projecting the head of the sliding body 8 to the outside on the movable die junction surface 2a by the repulsive force of the pressing body 9.
[0016]
The third embodiment of the gas venting device according to the present invention will be described with respect to differences from the first embodiment. As shown in FIGS. 7 and 8, a movable mold 2 is provided with a gas vent centered on a gas inlet 4a of a gas suction passage 4 as shown in FIGS. The gas vent portion 5 is provided with an annular ridge 6 on the outside of the opposing surface 5a facing the fixed joining surface 1a. When the mold is clamped, the fixed joining surface 1a and the movable joining surface 2a come into contact with each other, so that the molten metal D is prevented from passing between the annular ridge 6 and the fixed joining surface 1a, thereby allowing the gas A to pass. An annular slit S is formed, and the gas A can flow into the gas inlet 4a from the entire circumference of the molten metal circuit 3b surrounding the annular slit S, and the flow of the molten metal D is prevented.
[0017]
The fourth embodiment of the gas venting device according to the present invention will be described in terms of differences from the second and third embodiments. As shown in FIG. 9, a sliding member 8 having a movable mold 2 and a gas vent 5 can be reciprocated. On the installation surface 2 b side of the movable mold 2, a pressing body 9 for pressing the sliding body 8 in a protruding direction is provided, and outside the sliding body 8, a molten metal circuit 3 b continuous with the molten metal inflow passage 3 a is provided, and a gas vent is provided. The portion 5 has an opposing surface 5a opposed to the fixed joining surface 1a, and an annular ridge 6 centered on the gas inlet 4a is provided at an outer peripheral portion of the opposing surface 5a at several locations on the inner peripheral side of the annular ridge 6. When the mold is clamped, the gap holding portions 16 of the sliding body 8 first come into contact with the fixed mold joining surface 1a, and in the contact state, descend while pressing the pressing body 9 to form an annular protrusion. The passage of the molten metal D is prevented between the strip 6 and the fixed joining surface 1a, and the passage of the gas A is prevented. Enabling annular slit S formed to, at the time of mold opening, is for projecting the head of the sliding body 8 to the outside on the movable die junction surface 2a by the repulsive force of the pressing body 9.
[0018]
The fifth embodiment of the gas venting device according to the present invention will be described in terms of differences from the fourth embodiment. As shown in FIG. 12, a sliding member 8 is provided with a gas vent portion 5 and a molten metal circuit 3b as shown in FIG. 5 is provided with an annular ridge 6 centered on the gas inlet 4a on an opposing surface 5a opposite to the fixed type joining surface 1a, and on the outside thereof, a molten metal circuit 3b continuous with the molten metal inflow passage 3a and a space retaining portion 16 Are formed in this order, and a molten metal circuit 3b is formed between the interval holding portion 16 and the annular ridge 6. When the mold is clamped, the interval holding portion 16 abuts on the fixed mold joining surface 1a and is fixed to the annular ridge 6. An annular slit S is formed between the mold joining surface 1a to prevent the molten metal D from passing therethrough and allow the gas A to pass therethrough. When the mold is opened, the head of the sliding body 8 projects outward from the movable mold joining surface 2a. Is what you do.
[0019]
Since the degassing devices of the third and fourth embodiments are as described above, they are previously attached to the molding die B, communicate with the vacuum device F, and operate the vacuum device F and the casting machine.
When the fixed mold B1 and the movable mold B2 are clamped and the molten metal D is press-fitted into the cavity C of the molding mold B, the gas A in the cavity C takes the gas vent 5 from the molten metal inflow passage 3a as shown in FIG. The molten metal D, which reaches the surrounding molten metal circuit 3b and passes through the annular slit S and is absorbed by the vacuum device F, flows into the molten metal path 3 from the molten metal inflow path 3a to the molten metal circuit 3b. Cannot flow through the gas suction path 4.
In the degassing device of the fourth embodiment, after the molten metal D is solidified in the cavity C and the molten metal path 3, the fixed mold B1 and the movable mold B2 are opened, and the fixed mold 1 and the movable mold 2 are opened. As shown in FIG. 9A, the mold is opened at the same time, and by the mold opening, first, the sliding body 8 protrudes from the movable mold joining surface 2a by the pressing body 9, and pushes out the unnecessary solidified solidified by the molten metal passage 3 or the like. The unnecessary solidified material is extruded together with the product because it is integral with the product formed by the cavity C.
[0020]
The difference between the sixth embodiment of the degassing device according to the present invention and the fourth and fifth embodiments will be described. As shown in FIG. 15, the movable die 2 has a sliding member 8 and a molten metal path 3 surrounding the sliding member 8 as shown in FIG. And a first hot water inflow passage 13a, a second hot water inflow passage 23a, and a third hot water inflow passage 33a extending from two directions to four directions to the hot water circulation circuit 3b. An auxiliary hot water passage 3c is provided between the inflow passage 13a and the second hot water inflow passage 23a, and between the second hot water inflow passage 23a and the third hot water inflow passage 33a. The gas vent portion 5 is formed at the head of the sliding body 8, and the gas venting device 10 is disposed on the inner peripheral side of the ring-shaped cavity C1 when casting a ring-shaped product as shown in FIG. And, the molten metal passage 3 from the cavity C1 to the degassing device 10 is provided in a dispersed manner.
[0021]
The seventh embodiment of the degassing device according to the present invention will be described in terms of differences from the first to sixth embodiments. As shown in FIG. 17, the first gas vent portion 15 extends from the inflow side of the molten metal D toward the gas suction side. The second gas vent portion 25 is provided at a constant interval, the molten metal circuit 3b of the molten metal passage 3 is provided across both the gas vent portions 15, 25, and the first gas inlet portion 14a of the gas suction passage 4 is provided in the first gas vent portion 15. In addition to being provided orthogonally, the second gas vent 25 is also provided with a second gas inlet 24a orthogonally, and the first gas inlet 14a and the second gas inlet 24a are communicated with the gas outlet 4b.
[0022]
【Example】
When the movable die 2 is provided with the slide 8, the through-hole 20 is formed from the main hole 21 and the sub-hole 22 having a larger diameter than the main hole 21, and the slide 8 is inserted into the main hole 21. When the sliding body 8a is formed from the sliding body 8a and the sliding skirt 8b to be inserted into the sub-hole 22, the protrusion of the sliding body 8 can be limited. It is also possible to provide a concave portion 18 which opens in the descending direction on the tail side of the sliding member 8, and to provide the pressing member 9 between the concave portion 18 and the molding die B.
In the gas venting device of the sixth embodiment, the first gas vent 15 and the second gas vent 25 can be arranged in parallel in the inflow direction of the molten metal D.
[0023]
The degassing device of FIG. 18 is a type of the fourth embodiment, in which a molten metal circuit 3b is provided outside a sliding member 8 and is continuous with a molten metal inflow passage 3a, and a gas vent portion 5 of the sliding member 8 has a fixed joining surface 1a. An annular ridge 6 having a gas inlet 4a as a center is provided on the outer peripheral portion of the opposing surface 5a, and a fixed holding surface 1a is provided with an interval holding portion 16 protruding toward the opposing surface 5a. The spacing member 16 is in contact with the opposing surface 5a to form an annular slit S between the annular ridge 6 and the fixed joining surface 1a, which is substantially the same as the gas venting device of the fourth embodiment. Achieve the goal.
[0024]
As shown in FIG. 13, the hot water circuit 3b narrows the road width h toward the front side from the hot water inflow path 3a side, or makes the road depth t shallow toward the front side from the hot water inflow path 3a side, Alternatively, when the path width h and the path depth t are reduced toward the front side from the hot water inflow path 3a side, the inflow of the gas A from the entire circumference of the gas vent section 5 to the gas inlet section 4a located at the center is uniform. There are advantages that can be achieved.
As long as the pressing body 9 has a repulsive force or elasticity that enables the sliding body 8 to reciprocate (within several mm), the material and the shape are free, but as shown in FIG. It is preferable to use the elastic body 29 of.
[0025]
In the degassing device 10 using the sliding body 8, if the lubricating means G for the sliding body 8 is provided, the movement of the sliding body 8 can be kept long and smooth. Further, since the sliding body 8 protrudes outside from the movable mold joining surface 2a when the mold is opened, even if the molten metal D flows into the gas vent portion 5 and solidifies, it can be automatically discharged when the mold is opened. As a result, the normal annular slit S can be always maintained at the time of mold clamping.
In the embodiment, the gas suction path 4 is provided in the fixed mold 1, but it may be provided in the movable mold 2, or may be provided so as to penetrate the sliding body 8 and the pressing body 9. is there.
The molten metal circuit 3b of the molten metal passage 3 is formed all around the gas vent portion 5 and surrounds the gas vent portion 5, but substantially achieves the purpose even if it is cut off at the opposite end of the molten metal inflow passage 3a. .
[0026]
The annular ridge 6 and the spacing member 16 of the gas vent portion 5 can be provided on either the fixed mold 1 or the movable mold 2 in one of the molds 11 or the other mold 12. It is also possible to provide separately. Further, the gas suction path 4 can be provided in either the one mold 11 or the other mold 12.
The branch portion 30 has an effect of facilitating branching from the hot water inflow passage 3a to the hot water circuit 3b and avoiding a direct inflow of the molten metal D and the gas A from the hot water inflow passage 3a to the annular ridge 6, It is not always necessary, and when the hot water inflow passages 3a are provided in two to four directions as in the sixth embodiment, the hot water inflow passages 3a can be omitted.
[0027]
Unnecessarily solidified material solidified in the inflow portion 3a of the molten metal passage 3, the molten metal circuit 3b, or the like can be discharged by the extrusion pin P when the mold is opened.
The range that can be adopted as the gap of the annular slit S is 0.1 to 0.05 mm, the desirable range is 0.09 to 0.06 mm, and the optimal range is 0.08 to 0.07 mm. If the gap is larger than 0.1 mm, the molten metal D passes. If the gap is made smaller, the molten metal D can be prevented from passing. However, the passage resistance of the gas A increases and the suction amount decreases. To compensate for this, it is necessary to increase the suction force or increase the range of the slit.
In the present invention, the annular slit S is formed around the gas inlet portion 4a, and suction is performed from the entire circumference of the slit S, so that the carver can be quantitatively carved.
Since the annular slit S formed by the annular ridge 6 is larger than the annular slit S formed by the top 7a of the spherical portion 7, a large amount of gas A can be sucked by that amount.
[0028]
The present invention is characterized in that the annular slit S is kept long and constant. For this purpose, it is necessary to increase the contact accuracy between the fixed mold 1 and the movable mold 2 and the like. The contact accuracy has been successfully improved, and the movable mold 2 is provided with the sliding body 8 so that the fixed mold 1 and the sliding body 8 can be brought into contact with each other, so that the contact precision has been further improved.
The space holding portion 16 for maintaining the annular slit S is sufficient to withstand the contact strength and the high-temperature gas, and the smaller the molding range, the easier the contact accuracy is maintained.
[0029]
【The invention's effect】
Since the degassing method of the degassing device according to the present invention is as described above, the following effects can be obtained.
An annular slit is provided around the gas inlet of the gas suction path outside the gas inlet to prevent the passage of the molten metal and allow the gas to pass therethrough, and the outside thereof is provided with a molten metal passage that is continuous with the mold cavity. Therefore, only the gas can be efficiently sucked from the entire circumference of the annular slit while preventing the passage of the molten metal. That is, it is possible to prevent the inflow of aluminum scrap and the like into the vacuum device.
[0030]
Further, since the degassing device according to the present invention is as described above, the following effects can be obtained.
The gas venting device is provided with a gas suction path orthogonal to the mold joint, and includes a gas vent section centered on the gas inlet section, and a molten metal path communicating with the cavity and surrounding the gas vent section. Gas can be sucked from the circumference. As a result, it is possible to reduce the size and weight as compared with the valve type, simplify the maintenance and handling operations, etc., and provide it at low cost.
In particular, even if the shape of the cavity becomes complicated, it can be provided at an arbitrary position, so that the gas discharge path can be shortened and gas can be easily vented.
[0031]
According to a third aspect of the present invention, in addition to the effect of the second aspect, in addition to the effect of the second aspect, the gas vent portion is provided with a spherical portion centered on the gas inlet portion of the gas suction passage and larger than the gas inlet portion. Since the annular slit is formed between the top of the portion and the other mold joining surface, even if the molten metal flows from the molten metal to the spherical portion, the molten metal can be blocked by the annular slit. Also, since there are no moving parts, no maintenance is required, and the size can be reduced compared to a chill vent type in which a zigzag ventilation path is linearly provided.
In the gas venting device according to the fourth aspect, in addition to the effect of the second aspect, the gas vent portion is formed around the gas inlet portion of the gas suction passage and has an annular ridge on the outer peripheral side of the opposing surface larger than the gas inlet portion. Since the annular slit is formed between the annular ridge and the other mold joining surface at the time of mold clamping, even if gas is sucked from the molten metal toward the gas inlet portion, the inflow of the molten metal can be prevented by the annular slit. . Since the range of forming the annular slit can be made larger than that of the third aspect, a large amount of gas can be sucked accordingly.
[0032]
The gas venting device according to claim 5, in addition to the effects of claims 3 and 4, has a gas vent portion on the sliding body and presses the sliding body in the protruding direction with the pressing body, so that the annular slit is formed with gas. It can be kept for a long time in an optimum state for pulling out. Even if aluminum scum adheres to the gas vent portion, the aluminum scum can be naturally discharged and a normal state can be maintained for a long time. As a result, it is possible to prevent the occurrence of product defects due to clogging, not only to improve the yield, but also to prevent the gas venting device from being damaged. Further, since the sliding body is only slightly moved by the mold clamping and the pressing body, external operation is not required, and maintenance is not required. Moreover, even if the molding cycle is accelerated, there is little occurrence of mechanical trouble.
In the gas venting device according to claim 6, in addition to the effect of claim 5, since the space holding portion is provided on the inner peripheral side of the annular ridge, the contact area for maintaining the annular slit is smaller than the others. Accordingly, the contact accuracy can be improved. Even if there is an error in the height of the interval holding portion, less adjustment is required, and as a result, a remarkable effect is exerted on maintaining the annular slit.
[0033]
According to a seventh aspect of the present invention, in addition to the effects of the fourth aspect, in addition to the effect of the fourth aspect, the sliding body is provided with the annular ridge of the gas vent portion, and the molten metal path and the interval holding portion are provided outside thereof. Even if the molten metal is solidified in the molten metal passage, the reciprocating motion of the sliding body is hardly hindered by the individualized surplus members.
[0034]
In the gas venting device according to the eighth aspect, in addition to the effects of the third, fourth, fifth, sixth and seventh aspects, the annular slit is formed around the gas inlet of the gas suction path and outside the gas inlet. Therefore, even if the gas is sucked from the gas inlet, the passage of the molten metal is prevented by the annular slit, and only the gas can be sucked.
In the gas venting device according to the ninth aspect, in addition to the effects of the fifth, sixth, seventh, and eighth aspects, since the pressing body is an elastic body made of a synthetic resin, there is little breakage even when used for a long time, and handling is also easy. Easy.
The gas venting device according to the tenth aspect has the first gas vent portion and the second gas vent portion in addition to the effects of the second, fourth, fifth, sixth, and ninth aspects, and thus has a large cavity capacity. It can also handle casting.
[0035]
In the gas venting device according to the eleventh aspect, in addition to the effect according to any one of the second to tenth aspects, the molten metal path surrounding the gas vent portion surrounds the gas vent portion. Gas can be efficiently sucked toward the located gas inlet. In the gas venting device according to the twelfth aspect, in addition to the effect of the eleventh aspect, the cross-sectional area of the hot water circuit becomes smaller toward the front part side than the hot water inflow path side, so that the passage resistance of the molten metal is uniform. And the gas can be uniformly sucked from the entire circumference of the annular slit.
[Brief description of the drawings]
FIG. 1 is a schematic view of a casting means using a degassing method and a degassing device according to the present invention.
FIG. 2 is a schematic cross-sectional view of a molding die to which a degassing device according to the present invention is attached.
FIGS. 3A and 3B are schematic plan views showing examples of mounting a fixed type and a movable type of a gas venting device. FIGS.
FIGS. 4A and 4B are a schematic cross-sectional view at the time of opening the mold and an enlarged cross-sectional view of a main part at the time of mold clamping in the first embodiment of the gas venting method and the gas venting device of the present invention.
5 (a), (b) and (c) are a schematic plan view of a fixed type and a movable type according to the first embodiment, and a flow diagram of gas.
FIGS. 6A and 6B are a schematic cross-sectional view of the second embodiment when the mold is opened and an enlarged cross-sectional view of a main part when the mold is closed.
FIGS. 7A and 7B are a schematic sectional view of the third embodiment when the mold is opened and an enlarged sectional view of a main part when the mold is clamped.
8 (a), (b) and (c) are a schematic plan view of a fixed type and a movable type according to the third embodiment, and a gas flow diagram.
FIGS. 9A and 9B are a schematic cross-sectional view of the fourth embodiment when the mold is opened and an enlarged cross-sectional view of a main part when the mold is clamped.
FIG. 10 is a plan view of a movable mold according to the second embodiment.
FIG. 11 is a plan view of a movable mold according to a fourth embodiment.
12A and 12B are a schematic cross-sectional view of the fifth embodiment when the mold is opened and an enlarged cross-sectional view of a main part when the mold is closed.
FIG. 13 is an enlarged sectional view of a peripheral circuit.
FIG. 14 is a plan view of a movable mold according to a fifth embodiment.
FIG. 15 is a schematic plan view of a movable die according to a sixth embodiment.
FIG. 16 is a plan view of a mold showing an example of use in the gas venting device of the sixth embodiment.
17 (a) and (b) are schematic plan views of a fixed type and a movable type of a degassing device according to a seventh embodiment.
FIGS. 18A and 18B are a schematic cross-sectional view at the time of mold opening and an enlarged cross-sectional view of a main part at the time of mold clamping in the fourth embodiment.
FIGS. 19A and 19B are schematic cross-sectional views of a degassing device showing an example of use of a pressing body.
20 (a), (b) and (c) are a schematic view of a main portion showing an example of use of a conventional chill vent type gas venting device, and schematic plan views of a fixed type and a movable type of the device.
[Explanation of symbols]
10 Degassing device
1 Fixed type, 1a type joint surface
2 Movable type, 2a type joint surface, 2b installation surface
11 One-sided mold, 11a One-sided joint surface, 12 The other-sided mold, 12a The other-side joint surface
3 Melt path
3a, 13a, 23a, 33a Inflow path, 3b circuit, 3c auxiliary path
4. Gas suction path, 4a, 14a, 24a inlet, 4b outlet
5, 15, 25 Gas vent, 5a Counter surface
6 annular ridges, 16 interval holding parts
7 Spherical part, 7a Top part
8 sliding body, 8a main slide part, 8b sub slide part, 18 recess
9 pressing body, 19 disc spring, 29 elastic body
20 through-hole, 21 main hole, 22 sub-hole
30 branch
S slit
A gas
B mold, B1 fixed mold, B2 movable mold
C, C1 cavity
D Molten metal
F vacuum equipment
G Lubrication means
P extrusion pin
h Road width, t Road depth

Claims (12)

成形金型（Ｂ）に取付けるガス抜き装置（１０）において、固定型（１）と可動型（２）との型接合部にガス吸引路（４）のガス入口部（４ａ）を直交して設け、型締め時に、ガス入口部（４ａ）を中心として、ガス入口部（４ａ）より外側に溶湯（Ｄ）の通過を阻止し気体（Ａ）の通過を可能にする環状スリット（Ｓ）と、金型キャビティ（Ｃ）に連続する溶湯路（３）とを順に形成し、環状スリット（Ｓ）により溶湯（Ｄ）の通過を阻止しながら環状スリット（Ｓ）の全周より気体（Ａ）のみを吸引し得るようにしたことを特徴とするガス抜き方法。In a gas venting device (10) attached to a molding die (B), a gas inlet part (4a) of a gas suction passage (4) is orthogonal to a mold joint between a fixed die (1) and a movable die (2). An annular slit (S) for preventing the passage of the molten metal (D) and allowing the gas (A) to pass therethrough outside the gas inlet (4a) with the gas inlet (4a) at the center when the mold is clamped; And a molten metal path (3) continuous with the mold cavity (C), and the gas (A) is formed from the entire circumference of the annular slit (S) while the passage of the molten metal (D) is prevented by the annular slit (S). A degassing method characterized in that only gas can be sucked. 固定型（１）と可動型（２）との何れか一方に、真空装置（Ｆ）に連通するガス吸引路（４）を両型（１，２）の型接合部に直交して設け、型接合部にガス吸引路（４）のガス入口部（４ａ）を中心とするガスベント部（５）と、キャビティ（Ｃ）に連通しガスベント部（５）を取囲む溶湯路（３）とを備えていることを特徴とするガス抜き装置。A gas suction path (4) communicating with the vacuum device (F) is provided at one of the fixed mold (1) and the movable mold (2) at right angles to the mold joint of both molds (1, 2). A gas vent portion (5) centered on the gas inlet portion (4a) of the gas suction passage (4) and a molten metal passage (3) communicating with the cavity (C) and surrounding the gas vent portion (5) are provided at the mold joint. A degassing device, comprising: ガスベント部（５）は、固定型（１）と可動型（２）との一方型（１１）より他方型接合面（１２ａ）に向けて突出する球面部（７）をガス吸引路（４）のガス入口部（４ａ）より大きく、且つガス入口部（４ａ）を中心にして設け、型締め時に、球面部（７）の頂部（７ａ）と他方型接合面（１２ａ）との間に環状スリット（Ｓ）を形成することを特徴とする請求項２記載のガス抜き装置。The gas vent portion (5) has a spherical portion (7) protruding from one of the fixed mold (1) and the movable mold (2) toward the joint surface (12a) of the other mold (11). The gas inlet portion (4a) is larger than the gas inlet portion (4a), and is provided around the gas inlet portion (4a). The degassing device according to claim 2, wherein a slit (S) is formed. ガスベント部（５）は、固定型（１）と可動型（２）との一方型（１１）に、他方型接合面（１２ａ）と相対する対抗面（７ａ）をガス吸引路（４）のガス入口部（４ａ）より大きく、且つガス入口部（４ａ）を中心にして設け、対抗面（７ａ）の外周側に環状突条（６）を設け、型締め時に、環状突条（６）と他方型接合面（１２ａ）との間に環状スリット（Ｓ）を形成することを特徴とする請求項２記載のガス抜き装置。The gas vent portion (5) is provided on one side (11) of the fixed type (1) and the movable type (2), and with an opposing surface (7a) facing the other type joining surface (12a) of the gas suction path (4). An annular ridge (6) is provided which is larger than the gas inlet portion (4a) and is provided around the gas inlet portion (4a), and an annular ridge (6) is provided on the outer peripheral side of the opposing surface (7a). 3. The degassing device according to claim 2, wherein an annular slit (S) is formed between the second mold joining surface and the other mold joining surface. 固定型（１）と可動型（２）との一方型（１１）に、他方型（１２）に向けて往復動する摺動体（８）と、摺動体（８）を他方型（１２）に向けて押圧する押圧体（９）とを備え、摺動体（８）は他方型（１２）側にガスベント部（５）を備え、型締め時に押圧体（９）を加圧し、型開き時に、加圧されていた押圧体（９）の反力により一方型接合面（１１ａ）から先部を外部に突出することを特徴とする請求項３又は４記載のガス抜き装置。One type (11) of the fixed type (1) and the movable type (2), a sliding body (8) reciprocating toward the other type (12), and the sliding body (8) in the other type (12). The sliding body (8) is provided with a gas vent portion (5) on the other mold (12) side, presses the pressing body (9) at the time of mold clamping, and The degassing device according to claim 3 or 4, wherein the tip portion protrudes outside from the one-side joining surface (11a) by a reaction force of the pressurized pressing body (9). 環状突条（６）より内周側に対抗面（７ａ）と他方型接合面（１２ａ）との一方側面に向けて突出する間隔保持部（１６）を備え、型締め時に、一方側面と間隔保持部（１６）とが当接し、環状突条（６）と一方側面との間に環状スリット（Ｓ）を形成することを特徴とする請求項５記載のガス抜き装置。On the inner peripheral side of the annular ridge (6), there is provided a space holding portion (16) protruding toward one side surface of the opposing surface (7a) and the other mold joining surface (12a). The degassing device according to claim 5, wherein the holding portion (16) is in contact with the holding portion (16) to form an annular slit (S) between the annular ridge (6) and one side surface. 固定型（１）と可動型（２）との一方型（１１）に、他方型（１２）に向けて往復動する摺動体（８）と、摺動体（８）を他方型（１２）に向けて押圧する押圧体（９）とを備え、摺動体（８）はガスベント部（５）の外周側に環状突条（６）を備えると共に、環状突条（６）の外側に溶湯路（３）と間隔保持部（１６）とを順に備え、型締め時に、間隔保持部（１６）が他方型接合面（１２ａ）に当接し、環状突条（６）と他方型接合面（１２ａ）との間に環状スリット（Ｓ）を形成することを特徴とする請求項４記載のガス抜き装置。One type (11) of the fixed type (1) and the movable type (2), a sliding body (8) reciprocating toward the other type (12), and the sliding body (8) in the other type (12). The sliding body (8) has an annular ridge (6) on the outer peripheral side of the gas vent portion (5), and the molten metal path (6) is provided outside the annular ridge (6). 3) and a spacing member (16) are provided in this order, and at the time of mold clamping, the spacing member (16) comes into contact with the other mold joining surface (12a), and the annular ridge (6) and the other mold joining surface (12a). 5. The gas venting device according to claim 4, wherein an annular slit (S) is formed between the degassing device and the device. 環状スリット（Ｓ）は、ガス吸引路（４）のガス入口部（４ａ）を中心とし、ガス入口部（４ａ）より外側に形成され、溶湯（Ｄ）の通過を阻止し気体（Ａ）の通過を可能にすることを特徴とする請求項３，４，５、６又は７記載のガス抜き装置。The annular slit (S) is formed around the gas inlet (4a) of the gas suction path (4) and outside the gas inlet (4a) to prevent the passage of the molten metal (D) and prevent the gas (A) from flowing. The degassing device according to claim 3, 4, 5, 6, or 7, which allows passage. 押圧体（９）が弾力性を有する合成樹脂の弾性体（２９）であることを特徴とする請求５，６，７または８記載のガス抜き装置。9. The degassing device according to claim 5, wherein the pressing body is an elastic body made of a synthetic resin having elasticity. 溶湯（Ｄ）の流入方向に第一ガスベント部（１５）と第二ガスベント部（２５）とを一定間隔で備え、各ガスベント部（１５，２５）に対してガス入口部（４ａ）を各々直交していることを特徴とする請求項２，４，５，６，８または９記載のガス抜き装置。A first gas vent portion (15) and a second gas vent portion (25) are provided at regular intervals in the inflow direction of the molten metal (D), and the gas inlet portions (4a) are orthogonal to the gas vent portions (15, 25). The degassing device according to claim 2, 4, 5, 6, 8, or 9, wherein 溶湯路（３）は金型キャビティ（Ｃ）に連通する湯流入路（３ａ）と、湯流入路（３ａ）に連通しガスベント部（５）を取囲む湯周回路（３ｂ）とから成ることを特徴とする請求項２〜１０記載の何れか１に記載のガス抜き装置。The molten metal path (3) is composed of a molten metal inflow path (3a) communicating with the mold cavity (C) and a molten metal circuit (3b) communicating with the molten metal inflow path (3a) and surrounding the gas vent portion (5). The degassing device according to any one of claims 2 to 10, characterized in that: 湯周回路（３ｂ）の路断面積が、湯流入路（３ａ）側より先部側に向けて小さくなることを特徴とする請求１１記載のガス抜き装置。The degassing device according to claim 11, wherein a cross-sectional area of the hot water circuit (3b) decreases toward a front side from a hot water inflow path (3a) side.

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