JP4292822B2

JP4292822B2 - Vacuum method for mold cavity and vacuum device used for the vacuum method

Info

Publication number: JP4292822B2
Application number: JP2003039138A
Authority: JP
Inventors: 巌森川
Original assignee: DIEENGINEERING CORP.
Current assignee: DIEENGINEERING CORP.
Priority date: 2002-04-10
Filing date: 2003-02-18
Publication date: 2009-07-08
Anticipated expiration: 2023-02-18
Also published as: JP2004001074A

Description

【０００１】
【発明の属する技術分野】
本発明は、金型キャビティ内からガス抜き装置と真空装置を介して空気やガス等の気体を抜くための真空方法と、その真空方法に用いる真空装置に関するものであり、真空装置は更にエアブロー手段を備えるもの、中継ブロックを備えるもの、エアブロー手段と潤滑手段を備えるものである。
【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、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。
例えばダイキャスト成形機に接続する吸引手段は、図１９の如く大型の真空タンク１００と電動式真空ポンプ１０１、及びそれらの関連機器（真空タンク１００の吸い込み側に設けるボールバルブ１０３とフイルター１０４とソレノイドバルブ１０５、真空タンク１００と真空ポンプ１０１の間に設けるリークバルブ１０６、真空ポンプ１０１に設けるイルミストトラップ１０７とモーター１０８、真空タンク１００の圧力計１０９、真空ポンプ１０１の制御部１１０）とを一体に備えている。
【０００３】
ガス抜き装置として、受動バルブや開閉バルブ等を備えたバルブ式と、可動型と固定型との間にガス吸引路をジグザグに備えたチルベント式とが知られており、バルブ式は溶融圧にて受動バルブが作動し、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、アルミの吸引阻止効果が高く、チルベント式は可動部品がないので、小型化が可能で小型鋳造機に有効である。何れのガス抜き装置も、金型のキャビティから吸引手段によって気体を吸引した際、溶湯の通過を阻止し、気体の通過を自由にするものである。
一方、金型を用いる鋳造工場等にあっては、空気圧で作動する工具類や機械類を使用するため、工場内に圧縮空気管路を適宜設けている。
【０００４】
【発明が解決しようとする課題】
鋳造機等に接続する吸引手段は、電動式真空ポンプや原動機式真空ポンプと、その関連機器とを一体に備えているため、装置が大型化し、配置場所に困り、高価になる問題点があると共に、取扱いにも高度の熟練を要する等の問題点があった。また、吸引手段に用いるガス抜き装置がバルブ式の場合、開閉バルブは型開き時に開状態にあり、この状態で離型剤を塗布すると、バルブより吸引側に水分が流入し、良好な状態が保てなくなる問題点もあった。更に、ガス抜き装置がバルブ式、或いはチルベント式であっても、使用中にアルミカスが詰まって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。
そこでこの本発明は、従来技術の備えるこのような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、主に工場内に配管された圧縮空気管路の空気圧を利用し、アスピレータの原理を用いた真空エジェクタにて真空タンクを減圧し、減圧されて真空タンクで金型キャビティから気体を吸引する真空方法と、その真空方法に用いる真空装置を提供することと、真空装置において更にエアブロー手段を備え、ガス抜き装置の掃除及び目詰まり検出を可能にすることにある。
【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、本発明による金型キャビティの真空方法は、請求項１として、成形金型にガス抜き装置を取付け、該装置に連通する真空装置を備え、型締め時に、ガス抜き装置を介して成形金型のキャビティから真空装置にて気体を吸引する真空方法において、真空装置に吸引空気路と電気制御部を備え、
吸引空気路は、既存圧縮空気管路より真空エジェクタに至る第一空気路と、真空エジェクタより真空タンクに至る第二空気路と、真空タンクからガス抜き装置に至る第三空気路とから成り、電気制御部は、第一空気路に介在する第一電磁弁と、第二空気路に介在する第二電磁弁と、第三空気路に介在する吸引路開閉弁と、真空タンクに取付けた吸引圧力計とに電気接続し、真空タンク内の圧力が設定圧より低下した時、吸引圧力計より電気制御部に電気信号を送り、吸引路開閉弁を閉鎖し、第一第二電磁弁を開放することで、既存圧縮空気管路より真空エジェクタに圧縮空気が流れ、それに伴い、アスピレータの原理によって真空タンク内から真空エジェクタに空気が吸引され、その結果、真空タンク内が減圧され、吸引圧力計が設定圧まで達した時、第一第二電磁弁を閉鎖し、成形金型の型締め直後からキャビティへの溶湯充填完了まで吸引路開閉弁を開放し、ガス抜き装置を介して減圧状態にある真空タンクにてキャビティから気体が吸引することを特徴とする。
【０００６】
ここで既存圧縮空気管路とは、工場内に配管されている圧縮空気の管路で、少なくとも１気圧以上の圧縮空気を送るものを言うが、圧縮空気を発生するコンプレッサーやシリンダー等の既存圧縮空気源を含むものである。
ここで金型キャビティ（キャビティ）とは、可動金型と固定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う。
ここで気体とは、成形金型の型締めによりキャビティ内に閉じ込められる空気、及びキャビティ内に充填された溶湯から発生するガス等を言う。
ここで真空タンクとは、少なくとも成形金型の１サイクルに必要とする容量を有し、金型キャビティ内の気体を可能な限り短時間に吸引して真空状態に近づけるものを言う。
ここで真空エジェクタとは、第一連結部に送った圧縮空気を外部開放部から外界に放出し、その圧縮空気の流れに誘導されて第二連結部、即ち、真空タンクから空気を吸引するものである。
【０００７】
請求項２として、請求項１記載の金型キャビティの真空方法において、真空装置に既存圧縮空気源よりガス抜き装置に至るエアブロー手段を備え、
エアブロー手段は、既存圧縮空気源に対する接続路に、少なくとも吸引路開閉弁よりガス抜き装置側の第三空気路に連続する高速ブロー回路を備え、電気制御部に第一第二電磁弁と吸引路開閉弁と吸引圧力計、及び高速ブロー回路に介在したブロー路開閉弁を電気接続し、成形金型の型開き時に、吸引空気路の吸引路開閉弁を閉鎖し、キャビティからの気体の吸引を停止する一方、ブロー路開閉弁を開口し、型開きされたガス抜き装置に対し気体の吸引方向と逆方向に圧縮空気を吹付け、少なくともガス抜き装置を掃除し得るようにしたこと特徴とする。
請求項３として、請求項２記載の金型キャビティの真空方法において、ガス抜き装置がバルブ式ガス抜き装置であり、電気制御部に、新たに安定鋳造時の真空度を正とし上限と下限を設定するブロー圧設定部と、ブロー停止から計測時までの一定時間Δｔを定めるブロー時間設定部とを備え、
型開き時に吸引路開閉弁を閉鎖し、キャビティから吸引空気路への気体の吸引を停止する一方、高速ブロー回路のブロー路開閉弁を開口し、ガス抜き装置に気体の吸引方向と逆方向に圧縮空気を送ることで、吸引空気路の吸引停止からブロー時間設定部とブロー圧設定部にて定めた一定時間Δｔ経過後の残圧状態によりガス抜き装置の目詰まりを検出し得るようにしたことを特徴とする。
【０００８】
ここでガス抜き装置とは、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、成形金型と同時に型閉め型開きされ、型閉め時にキャビティ内からの気体の吸引を可能にし、溶融の吸い込みを防ぐもので、可動型と固定型との間にガス抜き路をジグザグに設けたチルベント式ガス抜き装置と、開閉バルブや受動バルブ等を備えたバルブ式ガス抜き装置とが知られている。
ここでエアブロー手段とは、ガス抜き装置に向けて圧縮空気を送るものを言い、高速ブロー回路とは、成形金型が十分に加熱した後の高速鋳造時の型開き中に、ガス抜き装置に向けて吸引方向と逆方向に空気を送り、ガス抜き装置への離型剤の流入、及びアルミカスの流入を阻止するものである。
成形金型の型締め状態にある時、エアブロー手段は作動を停止していて、減圧状態にある真空タンクによりガス抜き装置を介してキャビティから気体を吸引し、成形金型の型開き状態にある時、キャビティからの気体の吸引を停止し、エアブロー手段が作動する。
ここでブロー圧設定部とは、ブロ開始圧力と測定時圧力とを設定調整するものを言い、ブロー時間設定部とは、ブロ開始時と減圧測定時とを設定調整するものを言う。
【０００９】
また本発明の金型キャビティ用真空装置（以下、真空装置と略す）は、請求項４として、請求項１の真空方法に用いる真空装置において、電気制御部と吸引空気路を備え、
吸引空気路は、既存圧縮空気管路より真空エジェクタに至る第一空気路と、真空エジェクタより真空タンクに至る第二空気路と、真空タンクからガス抜き装置に至る第三空気路とを備え、電気制御部は、第一空気路に介在する第一電磁弁と、第二空気路に介在する第二電磁弁と、第三空気路に介在する吸引路開閉弁と、真空タンクに取付けた吸引圧力計とに電気接続し、
真空タンク内の圧力が吸引圧力計の設定圧より低下した時、吸引圧力計より電気制御部に電気信号を送り、吸引路開閉弁を閉鎖し、第一第二電磁弁を開放することで、既存圧縮空気管路より真空エジェクタに圧縮空気が流れ、それに伴い、アスピレータの原理によって真空タンク内から真空エジェクタに空気が吸引され、その結果、真空タンク内が減圧され、吸引圧力計が設定圧まで達した時、第一第二電磁弁を閉鎖し、成形金型の型締め直後からキャビティへの溶湯充填完了まで吸引路開閉弁を開放し、ガス抜き装置を介して減圧状態にある真空タンクによってキャビティから気体を吸引することを特徴とする。
請求項５として、請求項４の真空装置において、電気制御部に新たに圧力設定部と警報部とを電気接続し、圧力設定部は真空タンクの内圧力を成形金型の１サイクル毎に設定圧力値に達するように制御し、警報部は真空タンク内の圧力が設定圧力以上又は設定圧力以下になった時に作動して異常を知らせることを特徴とする。
【００１０】
ここで吸引空気路の第一空気路とは、真空エジェクタと既存圧縮空気管路との間に介在し、空気圧の安定化、圧縮空気に混入した異物等の除去等を行うものを言い、第二空気路とは、真空エジェクタと真空タンクとの間に介在し、真空タンク内からの吸引を可能にし、真空タンク内への逆流を防ぐものを言い、第三空気路とは、真空タンクとガス抜き装置との間に介在し、主にガス抜き装置からの異物の混入を防ぐものを言う。
ここで吸引圧力計とは、真空タンク内の圧力を計測するものを言い、圧力設定部とは、タンク内圧力を成形品（キャビティの大きさ）に応じて変更するものを言う。
【００１１】
請求項６の真空装置は、請求項４または請求項５の真空装置において、既存圧縮空気源よりガス抜き装置に至るエアブロー手段を備えたブロー付き真空装置であり、
エアブロー手段は、既存圧縮空気源に対する接続路に、少なくとも吸引路開閉弁よりガス抜き装置側の第三空気路に連続する高速ブロー回路を備え、電気制御部は第一第二電磁弁と吸引路開閉弁と吸引圧力計、及び高速ブロー回路に介在したブロー路開閉弁を電気接続し、成形金型の型開き時に、吸引空気路の吸引路開閉弁を閉鎖し、金型キャビティからの気体の吸引を停止する一方、ブロー路開閉弁を開口し、型開きされたガス抜き装置に対し気体の吸引方向と逆方向に圧縮空気を吹付け、少なくともガス抜き装置を掃除し得るようにしたこと特徴とする。
請求項７のブロー付き真空装置は、請求項４または請求項５の真空装置において、第三空気路に中継ブロックを備えたブロー付き真空装置であり、中継ブロックは第三空気路からガス抜き装置に至る吸引介在路と、吸引介在路から分岐するブロー路と、ブロー路から既存圧縮空気源に至る接続路と、電気制御部とを備え、電気制御部は、ブロー圧設定部とブロー時間設定部と警報部、及びブロー路に介在するブロー路開閉弁と路内圧センサとを電気接続していることを特徴とする。
【００１２】
請求項８として、請求項６または請求項７のブロー付き真空装置において、ガス抜き装置がバルブ式ガス抜き装置であり、該ガス抜き装置は可動型と固定型の間に金型キャビティに連通する溶湯路を備え、溶湯路の入口側に受動バルブを、出口側に開閉バルブを配置し、且つ、受動バルブの作動を開閉バルブに伝える開閉レバーと、該レバーの動きをサポートする作動シリンダを備え、
エアブロー手段は高速ブロー回路の他に、ガス抜き装置の作動シリンダに連続する低速ブロー回路を備え、電気制御部は、両ブロー回路に個別に介在するブロー路開閉弁を電気接続し、低速鋳造時に低速ブロー回路を開口し、作動シリンダにて開閉バルブの閉鎖作動をサポートし、通常鋳造時に高速ブロー回路を開口し、高速ブロー回路よりガス抜き装置に対し気体の吸引方向と逆方向に圧縮空気を吹付け、型開きされたガス抜き装置を少なくとも掃除し得るようにしたことを特徴とする。
請求項９として、請求項８のブロー付き真空装置において、電気制御部に、新たに安定鋳造時の真空度を正とし上限と下限を設定するブロー圧設定部と、ブロー停止から計測時までの一定時間Δｔを定めるブロー時間設定部と、警報部とを電気接続し、型開き時に吸引路開閉弁を閉鎖し、キャビティから吸引空気路への気体の吸引を停止する一方、
高速ブロー回路のブロー路開閉弁を開口し、ガス抜き装置に気体の吸引方向と逆方向に圧縮空気を送ることで、吸引空気路の吸引停止からブロー時間設定部とブロー圧設定部にて定めた一定時間Δｔ経過後の残圧状態によりガス抜き装置の目詰まりを検出して警報部を作動し得るようにしたことを特徴とする。
【００１３】
ここで中継ブロックとは、吸引空気路のガス抜き装置側に介在するものを言い、吸引介在路とは、中継ブロックにおいて吸引空気路の一部を担うものを言い、ブロー路とは、中継ブロックにおいて吸引空気路より分岐するものを言う。
ここでブロー路開閉弁とは、吸引路開閉弁との関係において、両開閉弁の一方を閉鎖した状態において、他方を開放する関係にある。
ここで低速ブロー回路とは、開閉レバーに対する作動シリンダを、成形機の始動初期、即ち、成形金型が十分に加熱するまでの低速鋳造時に作動し、開閉レバーを介して開閉バルブを強制的に閉鎖作動するものを言う。
【００１４】
請求項１０として、請求項８または請求項９のブロー付き真空装置において、バルブ式ガス抜き装置に対する潤滑手段を備えた潤滑手段付き真空装置であり、
潤滑手段は少なくとも潤滑油Ｒの貯油タンクと、送油ポンプと、ガス抜き装置に連続する送油路とを備え、潤滑手段にて受動バルブや開閉バルブを潤滑し得るようにしたことを特徴とする。
【００１５】
ここで潤滑手段とは、バルブ式ガス抜き装置内において往復動する受動バルブ、開閉バルブ、突出しピン、作動シリンダの摺動部に潤滑油を送り、摺動を滑らかにするものを言う。
ここで電気制御部とは、第一第二電磁弁と吸引路開閉弁とをタンク内圧力に合わせてコントロールするもの、更にブロー圧設定部とブロー時間設定部に合わせてエアブロー手段又はブロー路のブロー路開閉弁をコントロールするものを言う。
ここで警報部とは、視覚的な警告灯、聴覚的なブザーやベル等であり、少なくともタンク内圧力が設定圧力以上又は以下になった時に異常を知らせるもの、及び吸引空気路の吸引停止からブロー時間設定部とブロー圧設定部にて定めた一定時間Δｔ経過後の残圧状態により異常を知らせるもの等を言う。
【００１６】
【発明の実施の形態】
先ず、ダイキャスト成形金型の構造を図１に基き説明すれば、成形金型Ｂは可動金型Ｂ１と固定金型Ｂ２との間にキャビティＣを形成しており、この成形金型Ｂに取付けるガス抜き装置６の内、バルブ式ガス抜き装置１６は、可動金型Ｂ１に取付ける可動型６ａと、固定金型Ｂ２に取付ける固定型６ｂとから成り、パーテングラインにキャビティＣに連通する溶湯路６３を備え、溶湯路６３の入口側に受動バルブ６４を、出口側に開閉バルブ６５を配置し、受動バルブ６４の作動を開閉バルブ６５に伝える開閉レバー６６を備え、受動バルブ６４は溶湯圧にて作動し、開閉バルブ６５は気体Ａの排出を可能にし、溶融の通過を阻止するものである。
ガス抜き装置６の内、チルベント式ガス抜き装置６は、図２の如く可動型６ａと固定型６ｂとのパーテングラインの一端側にキャビティＣに連通する溶湯路６３を、他端側に真空装置１に連通する排気路６２を備え、溶湯路６３と排気路６２との間にジグザクのガス抜き路６１を備えている。
【００１７】
次いで、本発明による金型キャビティの真空方法と、その真空方法に用いる真空装置１の基本形態を図１と図３に基き説明すると、真空装置１は既存圧縮空気管路ｄより真空エジェクタ２と真空タンク３を順に介在してガス抜き装置６に至る吸引空気路５を備える。
更に詳しく説明すると、吸引空気路５は、既存圧縮空気管路ｄよりアスピレータの原理を利用した真空エジェクタ２に至る第一空気路５１と、真空エジェクタ２より真空タンク３に至る第二空気路５２と、真空タンク３よりガス抜き装置６に至る第三空気路５３とから成る。
【００１８】
真空エジェクタ２は図１１の如く略Ｔ字状を成し、一方側に外部開放部２３を、他方側に第一連結部２１を、直交側に第二連結部２２を備え、第一連結部２１を第一空気路５１に、第二連結部２２を第二空気路５２に連続している。
真空装置１の主要構成品は図１２の如く外装体１０によって囲まれており、外装体１０の背面に第一空気路接続口５１ａと第三空気路接続口５３ａを設けている。
【００１９】
電気制御部４は、第一空気路５１に介在する第一電磁弁４１と、第二空気路５２に介在する第二電磁弁４２と、第三空気路５３に介在する吸引路開閉弁４３と、真空タンク３に設けた吸引圧力計５５とに電気接続すると共に、圧力設定部４４と警報部４５を電気接続し、吸引圧力計５５より電気制御部４に電気信号を送り、電気制御部４にて第一第二電磁弁４１，４２と吸引路開閉弁４３とを開閉制御することにより、既存圧縮空気管路ｄの空気圧を利用して真空タンク３を減圧し、成形金型Ｂの型締め時に減圧された真空タンク３にて金型キャビティＣから気体Ａを吸引するものである。
第一電磁弁４１より既存圧縮空気管路ｄ側の第一空気路５１と、吸引路開閉弁４３よりガス抜き装置６側の第三空気路５３にフイルター５４を各々備えている。
【００２０】
即ち、電気制御部４に接続した第一第二電磁弁４１，４２と吸引路開閉弁４３、及び圧力設定部４４と警報部４５と吸引圧力計５５とにより、真空タンク３の内部圧力を図６の如く成形金型Ｂの１サイクル毎に設定圧力ｂ値に達するように制御する。
警報部４５はブザーや警告灯等から成り、少なくとも図７の如く真空タンク３内の圧力が設定圧力以上、又は設定圧力以下になった時に作動して異常を知らせる。
【００２１】
本発明による真空方法と真空装置は上記の通りであるから、図１８の如く工程に従って用いられる。例えば、予め第一空気路５１を既存圧縮空気管路ｄに、第三空気路５３をガス抜き装置６に繋いでおき、先ず吸引路開閉弁４３を閉鎖し、第一第二電磁弁４１，４２を同時に開放するか、第二電磁弁４２に次いで第一電磁弁４１を開放すれば、圧縮空気は真空エジェクタ２の第一連結部２１から外部開放部２３に流れ、外部開放部２３から外部に放出され、それに伴い、即ち、アスピレータの原理によって真空タンク３内から真空エジェクタ２に空気が吸引され、圧縮空気と共に外部開放部２３に放出される。
その結果、真空タンク３内が減圧され、所定の圧力まで減圧された所で第一第二電磁弁４１，４２を同時に閉鎖するか、第二電磁弁４２に次いで第一電磁弁４１を閉鎖する。
【００２２】
成形金型Ｂの型締め直後から金型キャビティＣに溶湯を充填する間に、吸引路開閉弁４３を開放すれば、ガス抜き装置６を介して減圧状態にある真空タンク３によってキャビティＣから空気やガスの気体Ａが吸引される。
キャビティＣからの気体Ａの吸引によって真空タンク３内の圧力が低下し、即ち、成形金型Ｂが１サイクル作動し、製品を１個形成する毎に、真空タンク３内の圧力は低下する。真空タンク３内の圧力が設定圧力まで低下した時、第一第二電磁弁４１，４２を開放し、真空エジェクタ２により真空タンク３内から空気を吸引し、真空タンク３内を所定の圧力まで減圧する。
【００２３】
次に、本発明のブロー付き真空装置と、そのブロー付き真空装置１１を用いた真空方法の第一実施形態を説明すると、ブロー付き真空装置１１は前記真空装置１にエアブロー手段７を備えるものである。
エアブロー手段７は図４の如く、既存圧縮空気源Ｄに対する接続路７３に、少なくとも吸引路開閉弁４３よりガス抜き装置６側の第三空気路５３に連続する高速ブロー回路７２を備え、該ブロー回路７２にブロー開閉弁７４を介在し、電気制御部４に第一第二電磁弁４１，４２と吸引路開閉弁４３と吸引圧力計５５、及びブロー開閉弁７４を電気接続し、型開き時に吸引空気路５の吸引路開閉弁４３を閉鎖し、金型キャビティＣからの気体Ａの吸引を停止する一方、高速ブロー回路７２のブロー開閉弁７４を開口し、ガス抜き装置６に対し気体Ａの吸引方向と逆方向に圧縮空気を吹き込み、その圧縮空気の吹き込みによりガス抜き装置６のアルミカス等を吹き飛ばし、型開き状態にあるガス抜き装置６の可動型６ａと固定型６ｂの接合面を掃除し、且つ、吸引空気路５へのアルミカスと離型剤との流入阻止等を成す。
【００２４】
本発明のブロー付き真空装置と、その真空方法の第二実施形態を説明すると、上記ブロー付き真空装置において、電気制御部４に第一第二電磁弁４１，４２と吸引路開閉弁４３、吸引圧力計５５、ブロー開閉弁７４を電気接続すると共に、新たにブロー圧設定部４６とブロー時間設定部４７と警報部４５を電気接続し、型開き時に吸引空気路５の吸引路開閉弁４３を閉鎖し、金型キャビティＣからの気体Ａの吸引を停止する一方、高速ブロー回路７２のブロー開閉弁７４を開口することで、気体Ａの吸引停止から（高速ブロー回路７２からの圧縮空気の送り込み開始から）一定時間Δｔ経過後の圧力状態によりガス抜き装置６の目詰まりを検出して警報部４５を作動する。
また、ブロー圧の異常時（ホースの損傷、コネクタの接続不良等）、或は型締めが不完全な時にも作動して異常を知らせる。
【００２５】
第二実施例のブロー付き真空装置１１は、ガス抜き装置６に接続する吸引空気路５を閉鎖した状態で、圧縮空気源Ｄより高速ブロー回路７２を介してガス抜き装置６に圧縮空気を送り、少なくともガス抜き装置６を掃除し得るようにすると共に、ガス抜き装置６への圧縮空気の送り停止から一定時間経過後の残圧状態により目詰まりを検出し得るようにしたものである。
ガス抜き装置６の異常判定をする場合、安定鋳造時におけるΔｔ経過後の残圧力を正とし、例えば、ガス抜き装置６に対するブローを開始し、そのブローを停止してからΔｔ秒後の残圧力が図１６の異常線の如く設定数値を上回った場合（真空度が下がらない）、ガス抜き装置６や吸引空気路５の詰まり等を示し、キャビティＣ内の気体Ａが抜けていないことを示す。
【００２６】
ブロー付き真空装置１１を用いた真空方法の第三実施例を説明する。
第三実施例は、ガス抜き装置６がバルブ式ガス抜き装置１６であり、このバルブ式ガス抜き装置１６は図９の如く、開閉レバー６６よりパーティングライン側の受動バルブ６４と開閉バルブ６５との間に作動シリンダ６８を備えている。
エアブロー手段１７は、高速ブロー回路７２の他に、作動シリンダ６８に連続する低速ブロー回路７１を備え、低速ブロー回路７１にブロー路開閉弁７４とレギュレターを介在している。
低速ブロー回路７１は、成形機の始動初期、即ち、成形金型Ｂが十分に加熱するまでの低速鋳造時に、バルブ式ガス抜き装置１６における開閉レバー６６の動きを作動シリンダ６８にて強制的に作動し、開閉レバー６６を介して開閉バルブ６５を閉鎖作動するものであり、高速ブロー回路７２はバルブ式ガス抜き装置１６の開閉バルブ６５に吸引方向と逆方向の圧縮空気を吹き込むことで、第三空気路５３と開閉バルブ６５の掃除、開閉バルブ６５の目詰まりを防止する。
【００２７】
ブロー付き真空装置１１において、その一部を中継ブロック１９に集約したものであり、その第一実施例を説明すると、図１３の如くエアブロー手段１７と電気制御部１４とを備え、該エアブロー手段１７は吸引空気路５のガス抜き装置６側に介在する吸引介在路９１と、吸引介在路９１から分岐するブロー路９２と、ブロー路９２から既存圧縮空気源Ｄとに至る接続路９３とを備え、接続路９３にフイルター９９を接続し、電気制御部１４に吸引路開閉弁４３とブロー圧設定部９６とブロー時間設定部９７、及びブロー路９２に介在する路ブロー路開閉弁９４と内圧センサ９８とを電気接続し、該センサ９８からの電気信号を受けることにより、吸引空気路５に設けた吸引路開閉弁４３とブロー路開閉弁９４とを制御する。
【００２８】
中継ブロック１９の第二実施例を、第一実施例と相違する点について説明すると、図１４の如く中継ブロック１９に吸引路開閉弁４３を設けたものである。
第一第二実施例において、電気制御部１４はブロー圧設定部９６とブロー時間設定部９７、及びガス抜き装置６の異常警報部９５とを備え、ガス抜き装置６へのブローを開始し、ブローを停止してから一定時間Δｔ経過後の圧力状態により良否を判定し、異常時に警報部９５を作動し得るようにしたものである。
【００２９】
中継ブロック１９の第三実施例を説明すると、図１５の如く吸引介在路９１とブロー路９２とを備え、吸引介在路９１の一端側に真空装置１の第三空気路５３に対する第一接続口９ａを、他端側にガス抜き装置６に対する第二接続口９ｂを設け、ブロー路９２の端に接続路９３の第三接続口９ｃを設けている。
【００３０】
【実施例】
真空エジェクタ２は図１１の如く、第一連結部２１に外部開放部２３側に向けて先細となるノズル２６を設け、外部開放部２３にノズル２６と間隙を有して連通するディフューザ２８を有し、外気に開放しており、第二連結部２２にノズル２６とディフューザ２８との間に直行する通気部２７を備えている。
真空エジェクタ２の外部開放路２３の出口側にサイレンサ１２を取付ければ、外部開放路２３より外気に放出される圧縮空気と、真空タンク３から吸引されて外気に放出される空気との放出音を小さくすることができる。
【００３１】
吸引圧力計５５は真空タンク３と第二電磁弁４２との間、又は真空タンク３と吸引路開閉弁４３との間に設けても同様の目的を達成する。
真空タンク３の設定真空度範囲を、例えば上限を−８０Ｋｐａ（キロパスカル）、下限を−６０Ｋｐａ（キロパスカル）とした場合、真空タンク３内の真空度が−８０Ｋｐａ（キロパスカル）を上回った時、又は−６０Ｋｐａ（キロパスカル）を下回った時、警報部４５が作動して異常を知らせる。
真空装置１の下にキャスター２０を取付け、移動自在にすることも可能である。
【００３２】
ガス抜き装置６の異常判定をする場合、ブロー圧設定部４６，９６により安定鋳造時の真空度を正とし、上限と下限を設定し、ブロー時間設定部４７，９７によりブロー停止から計測時までをΔｔ秒後とする。
例えば、ガス抜き装置６に対するブローを開始し、そのブローを停止してからΔｔ秒後の残圧が図１６の異常線の如く設定数値を上回った場合、異常信号を発する。
即ち、ブロー停止から一定時間Δｔ経過後に、設定数値以内に到達しない場合（真空度が下がらない場合）、ガス抜き装置６の詰まり・ホース詰まり等を示し、キャビティＣ内のガスが抜けないことを示す。
【００３３】
潤滑手段８を備えたブロー付き真空装置１１（以後、潤滑手段付き真空装置とする）であり、この潤滑手段付き真空装置１１の第一実施形態は、図９の如くブロー付き真空装置１１に潤滑手段８を備えるものであり、その潤滑手段８は図５の如く、潤滑油Ｒの貯油タンク８１と送油路８３と送油ポンプ８２とを備え、電気制御部４に潤滑手段８の制御部を備え、送油路８３をバルブ式ガス抜き装置１６に接続し、型開き後に受動バルブ６４、開閉バルブ６５、突出しピン６７の摺動部に潤滑油Ｒを送り、作動を滑らかにする。
【００３４】
本発明による潤滑手段付き真空装置の第二実施例を、第一実施例と相違する点について説明すると、図１０の如く真空タンク３に二系統の第三空気路５３を設け、同時に二個のバルブ式ガス抜き装置１６から気体Ａを吸引し得るようにすると共に、両第三空気路５３にエアブロー手段７を各々備え、潤滑手段８にて二個のバルブ式ガス抜き装置１６を潤滑するものである。
【００３５】
潤滑手段付き真空装置の第三実施例を第一実施例と相違する点について説明すれば、第三実施例は図１７の如く、バルブ式ガス抜き装置１６に対する潤滑手段１８を備えており、潤滑手段１８は前記潤滑手段８と同様に、少なくとも潤滑油Ｒの貯油タンク８１と送油ポンプ８２と送油路８３と油圧計８４と油量計８５とを備え、送油路８３をガス抜き装置１６へ接続し、電気制御部１４にて油量と送油圧とを監視管理し、潤滑油Ｒが不足した場合、異常信号を出力する。
流量調整は、基本的にシーケンサの吐出時間設定で行う。
【００３６】
警報部９５は、潤滑油Ｒの油量低下、低速鋳造時のブロー圧低下、開閉バルブ６５の詰まり等をブザーや信号灯等で知らせるもので、例えば赤信号と黄色信号と緑信号を用いる場合、赤信号は低速鋳造時に開閉バルブ６５の強制閉鎖の空気圧が設定値を下回っている時と（その対応として、エア元圧の圧力確保。低速鋳造空気圧の設定値を下げる）、高速運転時にブロー残圧が所定の時間まで設定値を越えている時（その対応として、開閉バルブ６５の確認。開閉バルブ６５にアルミが詰まっている場合、アルミを除去する。アルミが詰まっていない場合、設定値を見直す）に点灯し、黄色信号は潤滑油量低下時（その対応として、潤滑油Ｒを所定量まで入れる。送油ポンプ８２を所定の圧力まで上げる。）に点灯し、緑信号は正常作動時に点灯する。
信号灯は、赤信号と黄色信号と緑信号とに限定されるものではなく、自由な色灯を採用することができる。
【００３７】
潤滑手段付き真空装置１１は図８の如く外装体１０によって囲まれ、外装体１０に第一空気路接続口５１ａと第三空気路接続口５３ａ、及び既存圧縮空気源Ｄに対する接続路接続口７３ａと低速ブロー回路接続口７１ａ等を備え、且つバルブ式ガス抜き装置１６に対する送油路接続口８３ａ等を新たに備えている。
中継ブロック１９を備えたブロー付き真空装置１１にあっては、第一接続口９ａと真空装置１、及び第二接続口９ｂとガス抜き装置６をホースで繋ぎ、エアブロー手段１７の接続路９３と既存圧縮空気源Ｄをホースで繋ぐ。
ブロー付き真空装置１１における既存圧縮空気源Ｄとして、工場内に配管されている既存圧縮空気管路ｄの外、圧縮空気を発生するコンプレッサーやピストン等を用いる。
【００３８】
ブロー付き真空装置１１にあっては、型開き後にブローを開始するように制御し、更に潤滑手段付き真空装置１１にあっては、型開き後にブローと潤滑とを開始するように共同信号とすることも可能であるし、両装置１１を自動運転、又は手動運転（低速鋳造時、潤滑油の供給）することも可能である。
潤滑油Ｒとして、例えば粘度の低い濁りのないマシン油を用い、貯油タンク８１として、例えば１５００ｃｃ容量のタンク８１を用い、一鋳造サイクルにつき吐出量０．２〜０．３ｃｃを一回供給する。
【００３９】
接続路７３，９３とブロー路開閉弁７４，７５，９４と警報部４５，９５とブロー圧設定部４６，９６とブロー時間設定部４７，９７の各々は、略同じ機能と作用効果を果たすものであり、説明の便宜上、記号を異にしたものである。
また、既存圧縮空気管路ｄと既存圧縮空気源Ｄは、略同様の目的で使用し、略同様の作用効果を発揮するものであるし、潤滑手段８，１８とエアブロー手段７，１７の各々も、略同様の機能と作用効果を発揮するものである。
更に、電気制御部４，１４は、制御範囲を多少異にするものの、共通の制御回路を有するし、中継ブロック９のブロー路９２は、高速ブロー回路７２と略同様の機能と目的を発揮する。
【００４０】
【発明の効果】
本発明における金型キャビティの真空方法は前記の通りであるから、次に記載する効果を奏する。
請求項１の真空方法は、既存圧縮空気管路に連続する真空エジェクタと、該エジェクタに連続する真空タンクを真空装置に備え、真空タンクをアスピレータの原理を利用した真空エジェクタにて減圧し、減圧された真空タンクにて金型キャビティから気体を吸引するものであるから、圧縮空気を得るための電動式真空ポンプや原動機式真空ポンプ、或はピストンシリンダー式真空ポンプ等が不用になる。その結果、著しく小型軽量となり、設置面積も少なくてすむばかりか、安価に提供し得る。しかも、取扱い操作も簡略になる。
型締め直後から金型キャビティに溶湯を充填完了するまでの間に吸引路開閉弁を開放することで、ガス抜き装置を介して減圧状態にある真空タンクによってキャビティから短時間に気体を吸引し得る。
【００４１】
請求項２の真空方法は、請求項１の特徴に加えて、エアブロー手段を備えているので、型開き中のガス抜き装置に対し、気体の吸引方向と逆方向に圧縮空気を送り、ガス抜き装置に付着したり詰まっているアルミカス等を吹き飛ばすことができる。即ち、型開き中にガス抜き装置に圧縮空気を吹き付け、掃除をすることができる。
請求項３の真空方法は、請求項２の特徴に加えて、エアブロー手段にブロー圧設定部とブロー時間設定部とを備えているので、バルブ式ガス抜き装置へのブロー開始時から一定時間経過後の圧力状態により、目詰まり等の異常を早期に発見し、警報を発することができる。即ち、目詰まり防止に有効であり、鋳造トラブルを未然に解消できる。
【００４２】
また、本発明による金型キャビティ用真空装置は前記の通りであるから、次に記載する効果を奏する。
請求項４の真空装置は、請求項１と同様の効果が得られる。特に真空タンクを減圧する目的で圧縮空気を得るための電動式真空ポンプや原動機式真空ポンプ、或はピストンシリンダー式真空ポンプの代わりに、アスピレータ式の真空エジェクタを採用しているので、同能力の真空ポンプ類に比較して著しく小型軽量化し、安価に提供し得るばかりか、メンテナンスも容易になる。しかも、駆動部品を使用していないので、可動音が静かであるし、真空装置にロータリーポンプを使用していないので、廃油も生じない。
【００４３】
請求項５の真空装置は、請求項４の効果に加えて、電気制御部に圧力設定部と警報部を電気接続しているので、真空タンク内の圧力が成形金型の作動毎に低下しても、圧力変動に応じて電磁弁を開閉し、タンク内圧力を設定圧力に保っことができる。
しかもタンク内圧力が設定圧力以上又は以下になった場合に警報を発し、異常を知らせるので、ロスを未然に防ぐこともできる。
【００４４】
請求項６の真空装置（ブロー付き）は、請求項４，５の効果に加えて、エアブロー手段を備え、その高速ブロー回路から型開き中のガス抜き装置に、気体の吸引方向と逆方向に圧縮空気を送るので、例えガス抜き装置にアルミカスが付着したり詰まっても、これを吹き飛ばすことができる。即ち、型開き中にガス抜き装置に圧縮空気を吹き付け、掃除をすることができるので、ガス抜き装置を正常な状態に長く保つことができる。
更に、ガス抜き装置の型合せ面に塗布される離型剤の吸い込みも阻止し得る。
請求項７の真空装置（ブロー付き）は、請求項４，５の効果に加えて、第三空気路に中継ブロックに備え、該ブロックに請求項６のエアブロー手段に相当する電気制御部やブロー手段を組み込むので、真空装置（ブロー付き）を更にコンパクトに、しかも簡便に構成し得る。
【００４５】
請求項８の真空装置（ブロー付き）は、請求項６，７の効果に加えて、ガス抜き装置がバルブ式ガス抜き装置であっても、ブロー手段に低速ブロー回路を備え、電気制御部にて低速ブロー回路と高速ブロー回路とを制御し得るので、開閉バルブを高速鋳造時の溶融スピードで設計しても、低速鋳造時（成形金型が加熱するまでの始動初期）における作動不良と、それによる開閉バルブから真空タンクへの異物の侵入を防止することができるばかりか、ガス抜き装置の異常時に警報を発し、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。特に、開閉バルブの目詰まり防止に有効である。
請求項９の真空装置（ブロー付き）は、請求項８の効果に加えて、電気制御部にブロー圧設定部とブロー時間設定部と警報部を電気接続しているので、バルブ式ガス抜き装置に対する圧縮空気の送り停止から一定時間経過後の圧力状態により、即ち、一定時間経過後の残圧が規定圧まで降下していない場合、目詰まり等の異常を早期に発見し、警報を発することができる。その結果、目詰まり等による鋳造トラブルを未然に解消し、製品不良の発生を未然に防止したり、バルブ式ガス抜き装置の損傷も防げる。
【００４６】
請求項１０の真空装置（潤滑手段付き）は、請求項９の効果に加えて、潤滑手段を備えているので、バルブ式ガス抜き装置に有効である。即ち、バルブ式ガス抜き装置において往復動するバルブ類の摺動を円滑にする（摺動性を維持し、安定作動に貢献する）ことができる。
【図面の簡単な説明】
【図１】バルブ式ガス抜き装置を用いた金型キャビティに対する本発明の真空方法を示す概略図である。
【図２】チルベント式ガス抜き装置を用いた金型キャビティに対する本発明の真空方法を示す概略図である。
【図３】本発明による真空装置の第一実施形態の使用例を示す概略図である。
【図４】真空装置（ブロー付き）の第一実施形態の使用例を示す要部概略図である。
【図５】潤滑手段とバルブ式ガス抜き装置との関係を示す要部概略図である。
【図６】真空タンク内圧力と時間との関係を示す圧力変動図である。
【図７】（イ）（ロ）真空タンク内の圧力状態図である。
【図８】（イ）（ロ）真空装置（潤滑手段付き）の正面図と背面図である。
【図９】真空装置（潤滑手段付き）の第一実施形態の使用例を示す要部概略図である。
【図１０】真空装置（潤滑手段付き）の第二実施形態を示す要部概略図である。
【図１１】真空エジェクタの断面図である。
【図１２】（イ）（ロ）真空装置（ブロー付き）の正面図と側面図である。
【図１３】真空装置（ブロー付き）における中継ブロックの第一実施形態を示す概略図である。
【図１４】真空装置（ブロー付き）における中継ブロックの第二実施形態を示す概略図である。
【図１５】中継ブロックの第三実施形態を示す使用状態図である。
【図１６】ブロー圧の正常時と異常時との関係を示す時系列図である。
【図１７】真空装置（潤滑手段付き）の第三実施形態を示す概略図である。
【図１８】鋳造プロセスを示す工程図である。
【図１９】従来吸引手段の使用例を示す平面図と側面図である。
【符号の説明】
１真空装置、１１真空装置（ブロー付き）
２真空エジェクタ、１２サイレンサ
２１第一連結部、２２第二連結部、２３外部開放部
２６ノズル、２７通気部、２８ディフューザ
３真空タンク
４，１４電気制御部、４１第一電磁弁、４２第二電磁弁
４３吸引路開閉弁、４４圧力設定部、４５，９５警報部
４６，９６ブロー圧設定部、４７，９７ブロー時間設定部
５吸引空気路、５１第一空気路、５２第二空気路、５３第三空気路
５４，９９フイルター、５５吸引圧力計
６ガス抜き装置、１６バルブ式ガス抜き装置
６ａ可動型、６ｂ固定型
６１ガス抜き路、６２排気路、６３溶湯路、６４受動バルブ
６５開閉バルブ、６６開閉レバー、６７突出ピン、６８作動シリンダ
７，１７エアブロー手段
７１低速ブロー回路、７２高速ブロー回路
７３，９３接続路、７４，７５，９４ブロー路開閉弁
８，１８潤滑手段、８１貯油タンク、８２送油ポンプ、８３送油路
８４油圧計、８５油量計
９，１９中継ブロック、９ａ，９ｂ，９ｃ接続口
９１吸引介在路、９２ブロー路、９８路内圧センサ
１０外装体
２０キャスター
Ａ気体
Ｂ成形金型、Ｂ１可動金型、Ｂ２固定金型
Ｃ金型キャビティ
Ｄ既存圧縮空気源、ｄ既存圧縮空気管路
Ｒ潤滑油[0001]
BACKGROUND OF THE INVENTION
  The present invention provides a vacuum method for extracting a gas such as air or gas from a mold cavity via a degassing device and a vacuum device;Its vacuum methodThe vacuum device further comprising an air blowing means,Having a relay block,An air blow means and a lubrication means are provided.
[0002]
[Prior art]
  When molding a high-precision, high-precision product using a mold, a suction means is connected to the molding mold via a gas venting device, and air or gas such as gas is sucked from the cavity so that the nest of the product can be removed. It prevented outbreaks and allowed the material to reach every corner of the cavity.
  For example, as shown in FIG. 19, the suction means connected to the die cast molding machine includes a large vacuum tank 100, an electric vacuum pump 101, and related equipment (a ball valve 103, a filter 104 and a solenoid provided on the suction side of the vacuum tank 100). A valve 105, a leak valve 106 provided between the vacuum tank 100 and the vacuum pump 101, an illuminating trap 107 provided on the vacuum pump 101 and a motor 108, a pressure gauge 109 of the vacuum tank 100, and a control unit 110) of the vacuum pump 101 are integrated. In preparation.
[0003]
  As a gas venting device, there are known a valve type equipped with a passive valve and an opening / closing valve, and a chill vent type equipped with a gas suction path between a movable type and a fixed type in a zigzag manner. The passive valve is activated, the operation of the valve is transmitted to the open / close valve, and the open / close valve is closed, so the aluminum suction prevention effect is high, and the chill vent type has no moving parts. It is valid. In any of the gas venting devices, when the gas is sucked from the cavity of the mold by the suction means, the passage of the molten metal is prevented and the passage of the gas is made free.
  On the other hand, in a casting factory or the like that uses a mold, compressed air pipes are appropriately provided in the factory in order to use tools and machinery that operate with air pressure.
[0004]
[Problems to be solved by the invention]
  The suction means connected to the casting machine or the like has an electric vacuum pump or a prime mover vacuum pump and its related equipment, so that there is a problem in that the apparatus becomes large, the location is difficult, and the cost is high. At the same time, there are problems such as requiring a high degree of skill in handling. In addition, when the degassing device used for the suction means is a valve type, the open / close valve is in an open state when the mold is opened, and when a release agent is applied in this state, moisture flows into the suction side from the valve, and a good state is obtained. There was also a problem that could not be maintained. Furthermore, even if the gas venting device is a valve type or a chill vent type, some countermeasures are necessary because the aluminum residue may be clogged during use.
  Therefore, the present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to mainly use the air pressure of the compressed air pipes piped in the factory.UseThe vacuum tank is depressurized with a vacuum ejector that uses the principle of a pyrator, and the pressure is reduced and gas is sucked from the mold cavity with the vacuum tank.Vacuum method and used in the vacuum methodAn object of the present invention is to provide a vacuum device and to further provide an air blowing means in the vacuum device to enable cleaning of the degassing device and detection of clogging.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, a method for vacuuming a mold cavity according to the present invention comprises:A degassing device is attached to the molding die, and a vacuum device communicating with the device is provided.When clampingThrough the venting deviceFrom the mold cavityIn vacuum equipmentIn a vacuum method for sucking gas,The vacuum device is equipped with a suction air path and an electric control unit,
The suction air path consists of a first air path from the existing compressed air pipe to the vacuum ejector, a second air path from the vacuum ejector to the vacuum tank, and a third air path from the vacuum tank to the degassing device, The electric control unit includes a first electromagnetic valve interposed in the first air passage, a second electromagnetic valve interposed in the second air passage, a suction passage opening / closing valve interposed in the third air passage, and a suction attached to the vacuum tank. Electrically connected to the pressure gauge, and when the pressure in the vacuum tank drops below the set pressure, the suction pressure gauge sends an electrical signal to the electrical controller, closes the suction path opening / closing valve, and opens the first and second solenoid valves As a result, compressed air flows from the existing compressed air pipe to the vacuum ejector, and accordingly, air is sucked from the vacuum tank to the vacuum ejector by the principle of the aspirator. As a result, the vacuum tank is depressurized, and the suction pressure gauge Up to set pressure The first and second solenoid valves are closed, and the suction path opening / closing valve is opened from the time immediately after the mold is clamped until the molten metal is filled into the cavity. The gas is sucked from the cavity.
[0006]
  Here, the existing compressed air pipeline is a pipeline of compressed air that is piped in the factory.sendThat said, it includes existing compressed air sources such as compressors and cylinders that generate compressed air.
  Mold cavity here(cavity)The term “product formation space provided between the movable mold and the fixed mold” refers to what is provided in a casting mold, a die-cast mold, an injection mold, or the like.
  Here, the gas means air confined in the cavity by mold clamping of the molding die, gas generated from the molten metal filled in the cavity, and the like.
  Here, the vacuum tank refers to a tank having a capacity required for at least one cycle of the molding die, and sucking the gas in the die cavity as close as possible to a vacuum state.
  Here, the vacuum ejector means the first connecting partsentCompressed air is discharged from the external open portion to the outside, and is guided by the flow of the compressed air to suck air from the second connecting portion, that is, the vacuum tank.
[0007]
  As a second aspect of the present invention, in the method for vacuuming a mold cavity according to the first aspect, the vacuum device includes an air blowing means from the existing compressed air source to the degassing device,
The air blow means includes a high-speed blow circuit that is continuous with at least a third air path on the gas venting device side from the suction path opening / closing valve in a connection path to the existing compressed air source, and the first second electromagnetic valve and the suction path are provided in the electric control unit. The on / off valve, suction pressure gauge, and blow path on / off valve interposed in the high-speed blow circuit are electrically connected, and when the mold is opened, the suction air on / off valve of the suction air path is closed to suck gas from the cavity. While stopping, the blow passage opening / closing valve is opened, and the compressed air is blown in the direction opposite to the gas suction direction to the degassing device which is opened, so that at least the degassing device can be cleaned. .
  As Claim 3, in the vacuum method of the mold cavity according to claim 2,The gas venting device is a valve-type gas venting device, and the upper and lower limits are newly set in the electric control unit with the degree of vacuum at the time of stable casting as positive.A blow pressure setting unit;A fixed time Δt from blow stop to measurement is determined.A blow time setting unit,
The suction path on / off valve is closed when the mold is opened, and the suction of gas from the cavity to the suction air path is stopped, while the blow path on / off valve of the high-speed blow circuit is opened, and the gas venting device is in the direction opposite to the gas suction direction. By sending compressed air, the clogging of the gas venting device can be detected by the residual pressure state after the elapse of a fixed time Δt determined by the blow time setting unit and the blow pressure setting unit from the suction stop of the suction air passage. It is characterized by that.
[0008]
  Here, the gas venting device is composed of a movable mold attached to the movable mold of the molding die and a fixed mold attached to the fixed die, and the mold closing mold is opened simultaneously with the molding mold, and the mold is released from the cavity when the mold is closed. A chill vent system that allows gas to be sucked in and prevents inhalation of melting. A venting path is provided in a zigzag between the movable type and the fixed type.Gas venting deviceAnd valve type with open / close valves and passive valvesGas venting deviceIs known.
  hereairBlow means means compressed air toward the degassersendThe high-speed blow circuit means that air is blown in the direction opposite to the suction direction toward the gas venting device during mold opening during high-speed casting after the mold is sufficiently heated.Feed, To prevent the release agent and the aluminum residue from flowing into the degassing device.
  When the molding die is in the clamped state, the air blowing means has stopped operating, and the vacuum tank in a reduced pressure state sucks gas from the cavity through the degassing device, and the molding die is in the mold open state. At that time, the suction of gas from the cavity is stopped and the air blowing means is activated.
  Here, the blow pressure setting unit refers to a unit that sets and adjusts the blow start pressure and the measurement time pressure, and the blow time setting unit refers to a unit that sets and adjusts the blow start time and the decompression measurement time.
[0009]
  According to a fourth aspect of the present invention, there is provided a vacuum device for a mold cavity (hereinafter abbreviated as a vacuum device), wherein the vacuum device used in the vacuum method according to the first aspect includes an electric control unit and a suction air passage.
The suction air path includes a first air path from the existing compressed air line to the vacuum ejector, a second air path from the vacuum ejector to the vacuum tank, and a third air path from the vacuum tank to the degasser, The electric control unit includes a first electromagnetic valve interposed in the first air passage, a second electromagnetic valve interposed in the second air passage, a suction passage opening / closing valve interposed in the third air passage, and a suction attached to the vacuum tank. Electrically connected to the pressure gauge,
When the pressure in the vacuum tank drops below the set pressure of the suction pressure gauge, an electrical signal is sent from the suction pressure gauge to the electrical control unit, the suction path opening / closing valve is closed, and the first second solenoid valve is opened, Compressed air flows from the existing compressed air line to the vacuum ejector, and as a result, air is sucked from the vacuum tank to the vacuum ejector by the principle of the aspirator. As a result, the vacuum tank is depressurized and the suction pressure gauge reaches the set pressure. When it reaches, the first and second solenoid valves are closed, the suction path opening / closing valve is opened from immediately after the mold is clamped until the molten metal is filled into the cavity, and the vacuum tank is in a depressurized state via the degassing device. A gas is sucked from the cavity.
  As a fifth aspect of the present invention, in the vacuum device of the fourth aspect, the electric control unitNewlyPressure setting unit and alarm unitElectrical connection,Pressure setting partThe internal pressure of the vacuum tank is controlled to reach the set pressure value for each cycle of the molding die,The alarm unit is in the vacuum tank.The pressure is higher than the set pressure or lower than the set pressure.Sometimes activatedIt is characterized by notifying abnormality.
[0010]
  Here, the first air passage of the suction air passage is interposed between the vacuum ejector and the existing compressed air pipe, and stabilizes the air pressure and removes foreign matters mixed in the compressed air. The two air passages are interposed between the vacuum ejector and the vacuum tank, enable suction from inside the vacuum tank, and prevent back flow into the vacuum tank, and the third air passage refers to the vacuum tank and It is interposed between the gas venting device and mainly prevents foreign matter from entering from the gas venting device.
  Here, the suction pressure gauge isvacuumIn the tankofThe pressure setting unit is used to measure the pressure inside the tank.(Cavity size)Say what to change according to.
[0011]
  The vacuum device according to claim 6 is:Claim 4 or claim 5In vacuum equipment ofFrom the existing compressed air source to the degasserIt is a vacuum device with a blow equipped with air blowing means,
The air blowing means includes a high-speed blow circuit that is continuous with at least the third air path on the gas venting device side from the suction path opening / closing valve in the connection path to the existing compressed air source, and the electric control unit includes the first second solenoid valve and the suction path. The on-off valve, the suction pressure gauge, and the blow path on-off valve interposed in the high-speed blow circuit are electrically connected, and when the mold is opened, the suction path on-off valve of the suction air path is closed, and the gas from the mold cavity is closed. While the suction is stopped, the blow passage opening / closing valve is opened, and the compressed air is sprayed in the direction opposite to the gas suction direction to the degassing device that is opened, so that at least the degassing device can be cleaned. And
  The vacuum device with blow according to claim 7 is:Claim 4 or claim 5In the vacuum device, the third air passage is equipped with a relay blockA vacuum device with a blow,Relay blockIs the thirdA suction passage from the air passage to the degassing device and a branch from the suction passageFrom the blowway and from the blowwayConnection path to existing compressed air sourceAnd an electric control unit,The electric control unit includes a blow pressure setting unit, a blow time setting unit, an alarm unit, andIntervenes in the blowwayThe blowway opening / closing valve and the road pressure sensor are electrically connected.
[0012]
  As claim 8,Claim 6 or Claim 7In the vacuum device with a blow, the gas venting device is a valve-type gas venting device, and the gas venting device is provided with a melt path communicating with the mold cavity between the movable mold and the fixed mold, and passively on the inlet side of the melt path. The valve is provided with an open / close valve on the outlet side, and an open / close lever that transmits the operation of the passive valve to the open / close valve, and an operating cylinder that supports the movement of the lever.
In addition to the high-speed blow circuit, the air blow means has a low-speed blow circuit continuous to the working cylinder of the degassing device,The electric control unitFor both blow circuitsIntervene individuallyBlowway opening / closing valveThe electrical connection, Open the low speed blow circuit during low speed casting, support the closing operation of the open / close valve with the working cylinder, open the high speed blow circuit during normal casting,From high-speed blow circuitCompressed air in the opposite direction to the gas suction directionSprayThe degassing device that has been opened is at least cleanable.
  As a ninth aspect of the present invention, in the vacuum apparatus with blow according to the eighth aspect, the electric control unit newly sets a blow pressure setting unit for setting the upper limit and the lower limit with a positive degree of vacuum at the time of stable casting, and from a blow stop to a measurement time. While electrically connecting the blow time setting unit that determines a certain time Δt and the alarm unit, the suction path opening and closing valve is closed when the mold is opened, and the suction of gas from the cavity to the suction air path is stopped,
High speed blow circuitThe blow passage opening / closing valve is opened, and the compressed air is sent to the degassing device in the direction opposite to the gas suction direction.After a certain amount of time ΔtResidual pressureThe alarm unit can be activated by detecting clogging of the degassing device depending on the state.
[0013]
  Here, the relay block means a thing interposed on the degassing device side of the suction air passage, the suction intervention passage means a part of the suction air passage in the relay block, and the blow passage means the relay block. The one that branches off from the suction air passage.
  Here, the blow path opening / closing valve is in a relationship with the suction path opening / closing valve, in which one of the both opening / closing valves is closed and the other is opened.
  Here, the low-speed blow circuit operates the operating cylinder for the open / close lever at the start of the molding machine, that is, during low-speed casting until the mold is sufficiently heated, and the open / close valve is forced through the open / close lever. Say something that operates closed.
[0014]
  As claim 10,Claim 8 or Claim 9In the vacuum device with a blow, a vacuum device with lubrication means provided with a lubrication means for the valve type gas venting device,
The lubrication means comprises at least an oil storage tank of the lubrication oil R, an oil feed pump, and an oil feed passage continuing to the degassing device, and the lubrication means can lubricate passive valves and on-off valves. To do.
[0015]
  Here, the lubrication means refers to a device that feeds lubricating oil to a passive valve, an on-off valve, a projecting pin, and a sliding portion of an operating cylinder that reciprocate in the valve-type gas venting device, thereby smoothing the sliding.
  Here, the electric control unit controls the first second electromagnetic valve and the suction path opening / closing valve in accordance with the pressure in the tank,Furthermore, air blow means or blow path opening / closing valves for blow paths are controlled according to the blow pressure setting section and blow time setting sectionSay.
  Here, the alarm unit is a visual warning light, an audible buzzer, a bell, etc., which at least notifies the abnormality when the tank pressure becomes higher or lower than the set pressure,In addition, informing the abnormality by the residual pressure state after the lapse of a fixed time Δt determined by the blow time setting unit and the blow pressure setting unit from the suction stop of the suction air passageSay.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  First, the structure of the die-cast molding die will be described with reference to FIG. 1. The molding die B has a cavity C formed between the movable die B1 and the fixed die B2, and the molding die B Among the gas venting devices 6 to be attached, the valve-type gas venting device 16 comprises a movable die 6a attached to the movable die B1 and a fixed die 6b attached to the fixed die B2, and is a molten metal communicating with the cavity C in the parting line. A path 63, a passive valve 64 on the inlet side of the molten metal path 63, an opening / closing valve 65 on the outlet side, and an opening / closing lever 66 for transmitting the operation of the passive valve 64 to the opening / closing valve 65. The passive valve 64 has a molten metal pressure. The open / close valve 65 enables the gas A to be discharged and prevents the passage of melting.
  Among the degassing devices 6, the chill vent type degassing device 6 has a molten metal passage 63 communicating with the cavity C at one end side of the parting line of the movable mold 6a and the fixed mold 6b as shown in FIG. An exhaust passage 62 communicating with the apparatus 1 is provided, and a zigzag gas vent passage 61 is provided between the molten metal passage 63 and the exhaust passage 62.
[0017]
  Next, the mold cavity vacuum method according to the present invention and the basic form of the vacuum apparatus 1 used in the vacuum method will be described with reference to FIGS. 1 and 3. The vacuum apparatus 1 is connected to the vacuum ejector 2 from the existing compressed air line d. A suction air passage 5 leading to the gas venting device 6 through the vacuum tank 3 in order.Prepare.
  More specifically, the suction air passage 5 includes a first air passage 51 extending from the existing compressed air pipe d to the vacuum ejector 2 using the aspirator principle, and a second air passage 52 extending from the vacuum ejector 2 to the vacuum tank 3. And a third air passage 53 extending from the vacuum tank 3 to the gas venting device 6.
[0018]
  Vacuum ejector 2As shown in FIG.It is substantially T-shaped, has an external open part 23 on one side, a first connecting part 21 on the other side, a second connecting part 22 on the orthogonal side, and the first connecting part 21 to the first air passage 51. The second connecting portion 22 is continuous with the second air passage 52.
  The main components of the vacuum apparatus 1 are surrounded by an outer package 10 as shown in FIG.RareThe first air passage connection port 51a and the third air passage connection port 53a are provided on the back surface of the exterior body 10.
[0019]
  The electric control unit 4 includes a first electromagnetic valve 41 interposed in the first air passage 51, a second electromagnetic valve 42 interposed in the second air passage 52, and a suction passage opening / closing valve 43 interposed in the third air passage 53. Electrical connection to suction pressure gauge 55 provided in vacuum tank 3In addition, the pressure setting unit 44 and the alarm unit 45 are electrically connected.Then, an electric signal is sent from the suction pressure gauge 55 to the electric control unit 4, and the first second electromagnetic valves 41, 42 and the suction path opening / closing valve 43 are connected by the electric control unit 4.Open and closeBy controlling, the vacuum tank 3 is depressurized using the air pressure of the existing compressed air line d,When clamping mold BThe gas A is sucked from the mold cavity C in the vacuum tank 3 whose pressure has been reduced.Is a thing.
  A filter 54 is provided in each of the first air passage 51 on the existing compressed air pipe d side from the first electromagnetic valve 41 and in the third air passage 53 on the gas venting device 6 side from the suction passage opening / closing valve 43.
[0020]
  That is, connected to the electric control unit 4First and second solenoid valves 41 and 42, a suction passage opening and closing valve 43, andPressure setting unit 44 and alarm unit 45;Suction pressure gauge 55And byThe internal pressure of the vacuum tank 3 is controlled so as to reach the set pressure b value for each cycle of the molding die B as shown in FIG.
  Alarm 45It consists of buzzers and warning lights,At least when the pressure in the vacuum tank 3 becomes equal to or higher than the set pressure as shown in FIG.
[0021]
  Since the vacuum method and the vacuum apparatus according to the present invention are as described above, they are used according to the steps as shown in FIG. For example, the first air passage 51 is connected in advance to the existing compressed air pipe d and the third air passage 53 is connected to the gas venting device 6. First, the suction passage opening / closing valve 43 is closed, and the first second electromagnetic valve 41, If the valve 42 is opened at the same time or the first solenoid valve 41 is opened after the second solenoid valve 42, the compressed air flows from the first connecting portion 21 of the vacuum ejector 2 to the outside opening portion 23, and from the outside opening portion 23 to the outside. Accordingly, that is, according to the principle of the aspirator, air is sucked from the inside of the vacuum tank 3 to the vacuum ejector 2 and is discharged together with the compressed air to the external opening 23.
  As a result, the inside of the vacuum tank 3 is depressurized, and when the pressure is reduced to a predetermined pressure, the first and second electromagnetic valves 41 and 42 are simultaneously closed, or the first electromagnetic valve 41 is closed after the second electromagnetic valve 42. .
[0022]
  Mold BImmediately after clampingFrom moldIf the suction passage opening / closing valve 43 is opened while the melt is filled in the cavity C, air or gas A is sucked from the cavity C by the vacuum tank 3 in a depressurized state via the degassing device 6.
  By suction of the gas A from the cavity C, the pressure in the vacuum tank 3 decreases, that is, each time the molding die B operates for one cycle to form one product, the pressure in the vacuum tank 3 decreases. When the pressure in the vacuum tank 3 drops to the set pressure, the first and second electromagnetic valves 41 and 42 are opened, air is sucked from the vacuum tank 3 by the vacuum ejector 2, and the inside of the vacuum tank 3 is increased to a predetermined pressure. Reduce pressure.
[0023]
  Next, a vacuum device with a blow according to the present invention and a first embodiment of a vacuum method using the vacuum device with blow 11 will be described.The vacuum device 11 with blow isThe vacuum apparatus 1 is provided with air blowing means 7.
  As shown in FIG. 4, the air blowing means 7 is provided with a high-speed blow circuit 72 connected to the existing compressed air source D in the connection path 73 at least from the suction path opening / closing valve 43 to the third air path 53 on the gas venting device 6 side. A blow on / off valve 74 is interposed in the circuit 72, and the first second electromagnetic valves 41, 42, the suction path on / off valve 43, the suction pressure gauge 55, and the blow on / off valve 74 are electrically connected to the electric control unit 4 to open the mold. Suction air passage 5Suction passage opening and closing valve 43And the suction of the gas A from the mold cavity C is stopped, while the high speed blow circuit 72 is stopped.Blow open / close valve 74, And the compressed air is blown into the degassing device 6 in the direction opposite to the suction direction of the gas A,By blowing the compressed air, the degassing device 6Blow away aluminum scum, etc.The mold is openThe joint surface of the movable mold 6a and the fixed mold 6b of the gas venting device 6 is cleaned, and the flow of aluminum debris and the release agent into the suction air passage 5 is prevented.
[0024]
  The vacuum device with blow according to the present invention and the second embodiment of the vacuum method will be described.The first and second solenoid valves 41 and 42 are electrically connected to the suction path opening / closing valve 43, the suction pressure gauge 55, and the blow opening / closing valve 74, and newlyBlow pressure setting unit 46, blow time setting unit 47, and alarm unit 45The electrical connection, Suction air path 5 when mold is openedSuction passage opening and closing valve 43And the suction of the gas A from the mold cavity C is stopped, while the high speed blow circuit 72 is stopped.Blow open / close valve 74By openingFrom the suction stop of gas A (from the start of compressed air feed from the high-speed blow circuit 72)The clogging of the degassing device 6 is detected by the pressure state after the lapse of a certain time Δt, and the alarm unit 45 is activated.
  Also, it operates to notify the abnormality when the blow pressure is abnormal (hose damage, poor connector connection, etc.) or when the mold clamping is incomplete.
[0025]
  The vacuum device 11 with a blow of the second embodiment is from a compressed air source D with the suction air passage 5 connected to the degassing device 6 closed.Via high speed blow circuit 72Compressed air is supplied to the degasser 6FeedAnd at least the degassing device 6 can be cleaned,Feeding compressed air to the degasser 6The clogging can be detected from the residual pressure state after a lapse of a certain time from the stop.
  When determining the abnormality of the gas venting device 6, the residual pressure after the lapse of Δt at the time of stable casting is made positive. For example, the residual pressure after Δt seconds after the blow to the gas venting device 6 is started and stopped. 16 exceeds the set numerical value as shown by the abnormal line in FIG. 16 (the degree of vacuum does not decrease), it indicates that the gas vent 6 or the suction air passage 5 is clogged, and that the gas A in the cavity C has not escaped. .
[0026]
  Of vacuum method using vacuum device 11 with blowThirdExamples will be described.
  ThirdIn the embodiment, the gas venting device 6 is a valve-type gas venting device 16, and this valve-type gas venting device 16 is located between the passive valve 64 and the opening / closing valve 65 on the parting line side from the opening / closing lever 66 as shown in FIG. Is provided with an operating cylinder 68.
  In addition to the high speed blow circuit 72, the air blow means 17 includes a low speed blow circuit 71 that is continuous with the working cylinder 68, and the low speed blow circuit 71 has a blow path opening / closing valve 74 and a regulator interposed therebetween.
  The low speed blow circuit 71 is used for the opening / closing lever 66 of the valve type gas venting device 16 at the initial stage of the molding machine, that is, at the time of low speed casting until the molding die B is sufficiently heated.Actuate movementCylinder 68AtThe valve is forcibly operated to close the opening / closing valve 65 via the opening / closing lever 66, and the high-speed blow circuit 72 blows compressed air in the direction opposite to the suction direction into the opening / closing valve 65 of the valve type gas venting device 16. Thus, the cleaning of the third air passage 53 and the opening / closing valve 65 and the clogging of the opening / closing valve 65 are prevented.
[0027]
  In the vacuum device 11 with blow, a part thereof is integrated into the relay block 19, and the first embodiment will be described. As shown in FIG.With electric control unit 14The air blowing means 17 includes a suction intervening passage 91 interposed on the degassing device 6 side of the suction air passage 5, a blow passage 92 branched from the suction intervening passage 91, and an existing compressed air source D from the blow passage 92. Connecting path 93 toPrepare and connectFilter 99 on road 93connection, Electric control unit 14SuckA pull-in valve 43It is interposed in the blow pressure setting unit 96, the blow time setting unit 97, and the blow path 92.Road blowway on-off valve 94And the internal pressure sensor 98 are electrically connected.By receiving the electrical signal from the sensor 98, the suction path opening / closing valve 43 and the blow path opening / closing valve 94 provided in the suction air path 5 are controlled.
[0028]
  The difference between the second embodiment of the relay block 19 and the first embodiment will be described. The suction block opening / closing valve 43 is provided in the relay block 19 as shown in FIG.
  In the first second embodiment, the electric control unit 14 includes a blow pressure setting unit 96, a blow time setting unit 97, and an abnormality alarm unit 95 of the gas venting device 6, and starts blowing to the gas venting device 6. The quality is determined based on the pressure state after a lapse of a certain time Δt after the blow is stopped, and the alarm unit 95 can be activated when there is an abnormality.
[0029]
  A third embodiment of the relay block 19 will be described. As shown in FIG. 15, a suction intervention path 91 and a blow path 92 are provided, and a first connection port for the third air path 53 of the vacuum device 1 is provided at one end side of the suction intervention path 91. 9 a, the second connection port 9 b for the gas venting device 6 is provided on the other end side, and the third connection port 9 c of the connection channel 93 is provided at the end of the blow channel 92.
[0030]
【Example】
  As shown in FIG. 11, the vacuum ejector 2 is provided with a nozzle 26 that tapers toward the external opening 23 at the first connecting portion 21, and a diffuser 28 that communicates with the nozzle 26 with a gap in the external opening 23. The second connection portion 22 is provided with a ventilation portion 27 that goes straight between the nozzle 26 and the diffuser 28.
  If the silencer 12 is attached to the outlet side of the external open path 23 of the vacuum ejector 2, the sound emitted from the compressed air released from the external open path 23 to the outside air and the air sucked from the vacuum tank 3 and released to the outside air. Can be reduced.
[0031]
  Even if the suction pressure gauge 55 is provided between the vacuum tank 3 and the second electromagnetic valve 42 or between the vacuum tank 3 and the suction path opening / closing valve 43, the same purpose is achieved.
  When the set vacuum degree range of the vacuum tank 3 is, for example, -80 Kpa (kilopascal) as the upper limit and -60 Kpa (kilopascal) as the lower limit, the degree of vacuum in the vacuum tank 3 exceeds -80 Kpa (kilopascal) Or, when it falls below -60 Kpa (kilopascal), the alarm unit 45 is activated to notify the abnormality.
  It is also possible to attach a caster 20 under the vacuum device 1 to make it movable.
[0032]
  When judging the abnormality of the gas venting device 6, the blow pressure setting units 46 and 96 set the vacuum degree at the time of stable casting as positive, set the upper and lower limits, and the blow time setting units 47 and 97 from the blow stop to the measurement time. Is after Δt seconds.
  For example, if the residual pressure after Δt seconds exceeds the set numerical value as shown by the abnormal line in FIG. 16 after the blow to the gas venting device 6 is started and stopped, an abnormal signal is generated.
In other words, when a certain time Δt has elapsed since the blow stop, if the pressure does not reach the set value (when the degree of vacuum does not drop), it indicates that the gas venting device 6 is clogged or the hose is clogged, and that the gas in the cavity C does not escape. Show.
[0033]
  A blow-equipped vacuum apparatus 11 (hereinafter referred to as a vacuum apparatus with a lubrication means) provided with a lubrication means 8, and the first embodiment of the vacuum apparatus 11 with a lubrication means includes:FIG.The blower vacuum device 11 is provided with a lubrication means 8 as shown in FIG.As shown in FIG.The oil storage tank 81, the oil feed path 83, and the oil feed pump 82 of the lubricating oil R are provided, the control unit of the lubrication means 8 is provided in the electric control unit 4, and the oil feed path 83 is connected to the valve type gas venting device 16. After the mold is opened, the lubricating oil R is sent to the sliding portions of the passive valve 64, the opening / closing valve 65, and the protruding pin 67 to smooth the operation.
[0034]
  The second embodiment of the vacuum device with lubrication means according to the present invention will be described in terms of differences from the first embodiment. As shown in FIG. Gas A can be sucked from the valve-type gas venting device 16, and air blow means 7 are provided in both third air passages 53, and the two valve-type gas venting devices 16 are lubricated by the lubricating means 8. It is.
[0035]
  The difference of the third embodiment of the vacuum device with lubricating means from the first embodiment will be described. The third embodiment is provided with a lubricating means 18 for the valve type gas venting device 16 as shown in FIG. The means 18 is provided with at least an oil storage tank 81 for the lubricating oil R, an oil feed pump 82, an oil feed path 83, an oil pressure gauge 84, and an oil amount gauge 85, as in the case of the lubrication means 8, and the oil feed path 83 is degassed. 16, the electric control unit 14 monitors and manages the oil amount and the hydraulic pressure, and outputs an abnormal signal when the lubricating oil R is insufficient.
  The flow rate is adjusted basically by setting the discharge time of the sequencer.
[0036]
  The alarm unit 95 notifies a low oil amount of the lubricating oil R, a low blow pressure at the time of low speed casting, a clogging of the opening / closing valve 65, etc. with a buzzer or a signal light. For example, when using a red signal, a yellow signal, and a green signal, The red signal indicates that the air pressure for forced closing of the open / close valve 65 is lower than the set value during low speed casting (and as a countermeasure, the pressure of the air source pressure is secured. When the pressure exceeds the set value until a predetermined time (correspondingly, check the opening / closing valve 65. If the opening / closing valve 65 is clogged with aluminum, remove the aluminum. If the aluminum is not clogged, set the set value. The yellow signal lights up when the amount of lubricating oil decreases (as a countermeasure, the lubricating oil R is added up to a predetermined amount. The oil pump 82 is raised to a predetermined pressure), and the green signal lights up during normal operation. To light.
  The signal lamp is not limited to a red signal, a yellow signal, and a green signal, and a free color lamp can be adopted.
[0037]
  As shown in FIG. 8, the vacuum device 11 with the lubricating means is surrounded by the exterior body 10, and the exterior body 10 has a first air path connection port 51a, a third air path connection port 53a, and a connection path connection port 73a for the existing compressed air source D. And a low-speed blow circuit connection port 71a and the like, and an oil feed passage connection port 83a and the like for the valve type gas venting device 16 are newly provided.
  In the vacuum device 11 with a blow provided with the relay block 19, the first connection port 9a and the vacuum device 1, and the second connection port 9b and the gas venting device 6 are connected by a hose, and the connection path 93 of the air blow means 17 Connect the existing compressed air source D with a hose.
  As the existing compressed air source D in the blower-equipped vacuum apparatus 11, a compressor, a piston, or the like that generates compressed air is used in addition to the existing compressed air duct d piped in the factory.
[0038]
  In the vacuum device 11 with blow, control is performed so that the blow is started after the mold is opened. Further, in the vacuum device 11 with lubrication means, the blow and lubrication are started after the mold is opened. It is also possible to operate both devices 11 automatically or manually (at low speed casting, supply of lubricating oil).
  As the lubricating oil R, for example, machine oil having a low viscosity and no turbidity is used. As the oil storage tank 81, for example, a tank 81 having a capacity of 1500 cc is used, and a discharge amount of 0.2 to 0.3 cc is supplied once per casting cycle.
[0039]
  Connecting passages 73 and 93 and a blow passage opening / closing valve 74,75,94, alarm units 45 and 95, blow pressure setting units 46 and 96, and blow time setting units 47 and 97 are substantially the same.Function and actionThis is effective, and the symbols are different for convenience of explanation.
  Further, the existing compressed air pipe d and the existing compressed air source D are used for substantially the same purpose and exhibit substantially the same operational effects, and each of the lubricating means 8 and 18 and the air blowing means 7 and 17 is used. Is almost the sameFunction and actionIt is effective.
  Furthermore, although the electric control units 4 and 14 have slightly different control ranges,circuitThe blow path 92 of the relay block 9 exhibits substantially the same function and purpose as the high-speed blow circuit 72.
[0040]
【The invention's effect】
  Since the mold cavity vacuum method according to the present invention is as described above, the following effects can be obtained.
  The vacuum method according to claim 1 comprises a vacuum device having a vacuum ejector continuous with an existing compressed air line and a vacuum tank continuing to the ejector, wherein the vacuum tank is depressurized by a vacuum ejector utilizing the principle of an aspirator, Since the gas is sucked from the mold cavity by the vacuum tank, an electric vacuum pump, a prime mover vacuum pump, a piston cylinder vacuum pump, or the like for obtaining compressed air becomes unnecessary. As a result, the size and weight can be remarkably reduced, and the installation area can be reduced. Moreover, the handling operation is simplified.
  By opening the suction path opening / closing valve immediately after mold clamping until filling the mold cavity with molten metal, gas can be sucked from the cavity in a short time by the vacuum tank in a depressurized state via the degassing device. .
[0041]
  Since the vacuum method of claim 2 is provided with an air blowing means in addition to the features of claim 1, compressed air is supplied in a direction opposite to the gas suction direction with respect to the degassing device during mold opening.FeedIt is possible to blow off the aluminum scum adhering to or clogging the degassing device. That is, cleaning can be performed by blowing compressed air to the degassing device during mold opening.
  In addition to the features of claim 2, the vacuum method of claim 3 is an air blower.Means to bro-Since it has a pressure setting part and a blow time setting part,Valve typeAn abnormality such as clogging can be detected at an early stage and an alarm can be issued according to the pressure state after a lapse of a certain time from the start of blowing to the degassing device. That is, it is effective in preventing clogging and can solve casting troubles.
[0042]
  Moreover, since the mold cavity vacuum apparatus according to the present invention is as described above, the following effects can be obtained.
  The vacuum device according to claim 4 comprises:The same effect as in the first aspect can be obtained. In particularAn aspirator type vacuum ejector is used in place of the electric vacuum pump, prime mover vacuum pump, or piston cylinder vacuum pump to obtain compressed air for the purpose of decompressing the vacuum tank. Compared with pumps, the size and weight are significantly reduced, and it can be provided at low cost, and maintenance is also facilitated. Moreover, since no driving parts are used, the moving sound is quiet, and no rotary oil is used in the vacuum device, so no waste oil is produced.
[0043]
  In addition to the effect of claim 4, the vacuum device of claim 5 includes a pressure setting unit and an alarm unit in the electric control unit.Electrical connectionBecausevacuumIn the tankofPressure formingMoldEven if the pressure drops every time, the solenoid valve can be opened and closed according to the pressure fluctuation, and the tank pressure can be kept at the set pressure.
  Moreover, when the tank internal pressure becomes higher than or lower than the set pressure, an alarm is issued to notify the abnormality, so that loss can be prevented beforehand.
[0044]
  The vacuum device (with blow) of claim 6 is provided with air blowing means in addition to the effects of claims 4 and 5, and from the high-speed blow circuit to the gas venting device in the mold opening direction opposite to the gas suction direction. Compressed airBecause I sendEven if an aluminum debris adheres to or clogs the degassing device, it can be blown away. That is, since the compressed air can be blown to the degassing device during the mold opening for cleaning, the degassing device can be kept in a normal state for a long time.
  Furthermore, it is possible to prevent the release agent applied to the mold-matching surface of the gas venting apparatus from being sucked.
  Claim 7Vacuum equipment (with blow)Claims 4 and 5In addition to the effect of the relay block in the third air path,It corresponds to the air blowing means of claim 6.Electric control unit and blowing meansBecause we incorporate, Vacuum equipment(With blow)Can be made more compact and simple.
[0045]
  Claim 8Vacuum equipment (with blow)Claims 6, 7In addition to the effects of the above, even if the gas venting device is a valve-type gas venting device, the blow means is equipped with a low-speed blow circuit, and the electric control unit can control the low-speed blow circuit and the high-speed blow circuit. Even if it is designed with a melting speed at high speed casting, it can prevent malfunction during low speed casting (starting up until the mold is heated) and prevent foreign matter from entering the vacuum tank from the open / close valve. In addition, an alarm is issued when the gas venting device is abnormal, and the flow of aluminum debris into the vacuum device can be prevented. In particular, this is effective for preventing clogging of the on-off valve.
  Claim 9Vacuum equipment (with blow)Claim 8In addition to the effects of the above, the electric control unit has a blow pressure setting unit, a blow time setting unit and an alarm unit.Electrical connectionBecauseValve typeGas venting deviceCompressed air supply toDepending on the pressure state after a certain time fromThat is, if the residual pressure after a certain time has not dropped to the specified pressure,Detecting abnormalities such as clogging early and issuing an alarmCan do. As a result, clogging, etc.Trouble with castingEliminate the productTo prevent the occurrence of defects,Valve typeDamage to the venting device can also be prevented.
[0046]
  In addition to the effect of the ninth aspect, the vacuum device (with the lubricating means) according to the tenth aspect includes the lubricating means, and is thus effective for the valve type gas venting apparatus. That is, it is possible to smoothly slide the valves that reciprocate in the valve-type gas venting device (maintaining slidability and contributing to stable operation).
[Brief description of the drawings]
FIG. 1 is a schematic view showing a vacuum method of the present invention for a mold cavity using a valve type gas venting apparatus.
FIG. 2 is a schematic view showing a vacuum method of the present invention for a mold cavity using a chill vent type gas venting apparatus.
FIG. 3 is a schematic view showing a usage example of the first embodiment of the vacuum apparatus according to the present invention.
FIG. 4 is a main part schematic diagram showing an example of use of the first embodiment of the vacuum apparatus (with blow).
[Figure 5]Relationship between lubrication means and valve type gas venting deviceFIG.
FIG. 6 is a pressure fluctuation diagram showing the relationship between the pressure in the vacuum tank and time.
7A and 7B are pressure state diagrams in a vacuum tank.
FIGS. 8A and 8B are a front view and a rear view of a vacuum device (with lubricating means).
FIG. 9: Vacuum device (with lubrication means)firstIt is a principal part schematic diagram which shows the usage example of embodiment.
FIG. 10: Vacuum device (with lubrication means)secondIt is a principal part schematic diagram which shows embodiment.
FIG. 11 is a cross-sectional view of a vacuum ejector.
FIGS. 12A and 12B are a front view and a side view of a vacuum device (with a blower).
FIG. 13 is a schematic diagram showing a first embodiment of a relay block in a vacuum apparatus (with blow).
FIG. 14 is a schematic view showing a second embodiment of the relay block in the vacuum apparatus (with blow).
FIG. 15 is a use state diagram showing a third embodiment of a relay block.
FIG. 16 is a time series diagram showing the relationship between normal and abnormal blow pressure.
FIG. 17 is a schematic view showing a third embodiment of a vacuum apparatus (with a lubricating means).
FIG. 18 is a process diagram showing a casting process.
FIGS. 19A and 19B are a plan view and a side view showing a usage example of a conventional suction unit. FIGS.
[Explanation of symbols]
1 Vacuum device, 11 Vacuum device (with blow)
2 Vacuum ejector, 12 Silencer
21 1st connection part, 22 2nd connection part, 23 External open part
26 nozzles, 27 vents, 28 diffusers
3 Vacuum tank
4,14 Electric control unit, 41 First solenoid valve, 42 Second solenoid valve
43 Suction path open / close valve, 44 Pressure setting section, 45, 95 Alarm section
46,96 Blow pressure setting part, 47,97 Blow time setting part
5 suction air passage, 51 first air passage, 52 second air passage, 53 third air passage
54,99 Filter, 55 Suction pressure gauge
6 Gas venting device, 16 Valve type gas venting device
6a Movable type, 6b Fixed type
61 Degassing path, 62 Exhaust path, 63 Molten path, 64 Passive valve
65 Open / close valve, 66 Open / close lever, 67 Protruding pin, 68 Actuating cylinder
7,17 Air blow means
71 Low-speed blow circuit, 72 High-speed blow circuit
73, 93 Connection path, 74, 75, 94 Blow path opening / closing valve
8,18 Lubrication means, 81 Oil storage tank, 82 Oil feed pump, 83 Oil feed path
84 Hydraulic gauge, 85 Oil gauge
9,19 Relay block, 9a, 9b, 9c Connection port
91 suction intervening path, 92 blow path, 98 internal pressure sensor
10 Exterior body
20 casters
A gas
B mold, B1 movable mold, B2 fixed mold
C Mold cavity
D Existing compressed air source, d Existing compressed air line
R Lubricating oil

Claims

A degassing device (6) is attached to the molding die (B), and a vacuum device (1) communicating with the device (6) is provided. When the mold is clamped, the molding die (B ) In the vacuum method of sucking the gas (A) from the cavity (C) with the vacuum device (1) ,
The vacuum device (1) includes a suction air passage (5) and an electric control unit (4),
The suction air passage (5) includes a first air passage (51) from the existing compressed air pipe (d) to the vacuum ejector (2) and a second air passage from the vacuum ejector (2) to the vacuum tank (3). (52) and a third air passage (53) from the vacuum tank (3) to the degasser (6),
The electric control unit (4) includes a first electromagnetic valve (41) interposed in the first air passage (51), a second electromagnetic valve (42) interposed in the second air passage (52), and a third air passage. (53) electrically connected to the suction path opening / closing valve (43) and the suction pressure gauge (55) attached to the vacuum tank (3);
When the pressure in the vacuum tank (3) falls below the set pressure, an electric signal is sent from the suction pressure gauge (55) to the electric control unit (4), the suction passage opening / closing valve (43) is closed, and the first second By opening the solenoid valves (41, 42), compressed air flows from the existing compressed air pipe (d) to the vacuum ejector (2), and accordingly, the vacuum ejector (3) is ejected from the vacuum tank (3) by the principle of an aspirator. 2) When air is sucked into the vacuum tank (3) and the suction pressure gauge (55) reaches the set pressure, the first and second solenoid valves (41, 42) are closed,
The vacuum tank (3) is in a depressurized state through the degassing device (6) by opening the suction passage opening / closing valve (43) immediately after the molding die (B) is clamped until the molten metal filling into the cavity (C) is completed. A method for vacuuming a mold cavity, characterized in that the gas (A) is sucked from the cavity (C).

The method for vacuuming a mold cavity according to claim 1, wherein the vacuum device (1) is provided with an air blowing means (7) from the existing compressed air source (D) to the degassing device (6), and the air blowing means (7) The connection path (73) to the compressed air source (D) is provided with a high-speed blow circuit (72) continuous to at least the third air path (53) on the gas venting device (6) side from the suction path on-off valve (43). The electric control unit (4) includes a first second solenoid valve (41, 42), a suction path opening / closing valve (43), a suction pressure gauge (55), and a blow path opening / closing valve (74) interposed in a high-speed blow circuit (72). Electrical connection)
When the mold (B) is opened, the suction path opening / closing valve (43) of the suction air path (5) is closed to stop the suction of the gas (A) from the cavity (C), while the blow path opening / closing valve is stopped. (74) was opened, and compressed air was sprayed in the direction opposite to the suction direction of the gas (A) to the degassing device (6) that was opened, so that at least the degassing device (6) could be cleaned. A method for vacuuming a mold cavity.

3. The method for vacuuming a mold cavity according to claim 2, wherein the gas venting device (6) is a valve-type gas venting device (16), and the electric control unit (4) is newly set to a positive degree of vacuum at the time of stable casting. And a blow pressure setting unit (46) for setting a lower limit, and a blow time setting unit (47) for determining a fixed time Δt from the blow stop to the measurement time ,
When the mold is opened, the suction path opening / closing valve (43) is closed to stop the suction of the gas (A) from the cavity (C) to the suction air path (5), while the blow path opening / closing valve ( 72) of the high-speed blow circuit (72) 74) is opened and compressed air is sent to the gas venting device (16) in the direction opposite to the suction direction of the gas (A) to stop the suction of the suction air passage (5) and the blow time setting section (47) and blow. A mold cavity vacuum method characterized in that clogging of a gas venting device (16) can be detected by a residual pressure state after a predetermined time Δt determined by a pressure setting section (46) .

The vacuum apparatus used in the mold cavity vacuum method according to claim 1, comprising an electric control section (4) and a suction air passage (5),
The suction air passage (5) includes a first air passage (51) from the existing compressed air pipe (d) to the vacuum ejector (2) and a second air passage from the vacuum ejector (2) to the vacuum tank (3). (52) and a third air passage (53) from the vacuum tank (3) to the degasser (6),
The electric control unit (4) includes a first electromagnetic valve (41) interposed in the first air passage (51), a second electromagnetic valve (42) interposed in the second air passage (52), and a third air passage. (53) electrically connected to the suction path opening / closing valve (43) and the suction pressure gauge (55) attached to the vacuum tank (3);
When the pressure in the vacuum tank (3) falls below the set pressure of the suction pressure gauge (55), an electric signal is sent from the suction pressure gauge (55) to the electric control unit (4), and the suction path opening / closing valve (43) is turned on. By closing and opening the first second solenoid valve (41, 42 ), compressed air flows from the existing compressed air pipe (d) to the vacuum ejector (2), and accordingly, the vacuum tank ( 3) When air is sucked into the vacuum ejector (2) from inside, and as a result, the inside of the vacuum tank (3) is depressurized, and when the suction pressure gauge (55) reaches the set pressure, the first second solenoid valve (41 , 42)
The vacuum tank (3) is in a depressurized state through the degassing device (6) by opening the suction passage opening / closing valve (43) immediately after the molding die (B) is clamped until the molten metal filling into the cavity (C) is completed. A vacuum device for a mold cavity, wherein the gas (A) is sucked from the cavity (C) by means of the above.

In the vacuum device for a mold cavity according to claim 4 , a pressure setting unit (44) and an alarm unit (45) are newly electrically connected to the electric control unit (4),
The pressure setting unit (44) controls the internal pressure of the vacuum tank (3) to reach the set pressure b value for each cycle of the molding die (B), and the alarm unit (45) is set in the vacuum tank (3). A mold cavity vacuum apparatus which operates when the pressure of the pressure becomes equal to or higher than a set pressure b or lower than a set pressure b to notify an abnormality.

A vacuum device for a mold cavity according to claim 4 or 5 , wherein the vacuum device with a blow is provided with an air blowing means (7) extending from an existing compressed air source (D) to a gas venting device (6). 7) A high-speed blow circuit (73) connected to the existing compressed air source (D) is connected to the third air path (53) on the degassing device (6) side from at least the suction path on-off valve (43). 72)
The electric control unit (4) includes a first second electromagnetic valve (41, 42), a suction path on / off valve (43), a suction pressure gauge (55), and a blow path on / off valve (74) interposed in a high speed blow circuit (72). ) Are electrically connected, and when the molding die (B) is opened, the suction passage open / close valve (43) of the suction air passage (5) is closed to suck the gas (A) from the die cavity (C). While stopping
Open the blow passage opening / closing valve (74), blow compressed air in the direction opposite to the suction direction of the gas (A) to the degassing device (6) opened, and clean at least the degassing device (6). A vacuum device for a mold cavity characterized by being obtained.

The mold cavity vacuum device according to claim 4 or 5 , wherein the third air passage (53) includes a relay block (19) ,
The relay block (19) includes a suction passage (91) from the third air passage (53) to the gas venting device (6), a blow passage (92) branched from the suction passage (91 ), and a blow passage (92 ) To the existing compressed air source (D), and an electric control unit (14). The electric control unit (14) includes a blow pressure setting unit (96) and a blow time setting unit (97). ), An alarm unit (95), and a blow passage opening / closing valve (94) interposed in the blow passage (92) and a pressure sensor (98) in the passage are electrically connected.

8. The blower-equipped vacuum device according to claim 6 or 7 , wherein the gas venting device (6) is a valve-type gas venting device (16), and the gas venting device (16) comprises a movable die (6a) and a fixed die (6b). ) Between the mold cavity (C), a passive valve (64) on the inlet side of the molten metal path (63), an open / close valve (65) on the outlet side, and An open / close lever (66) for transmitting the operation of the passive valve (64) to the open / close valve (65), and an operating cylinder (68) for supporting the movement of the lever (66),
In addition to the air blow means (7) fast blow circuit (72) comprises a low speed blowing circuit (71) that is continuous with the working cylinder (68) of the venting device (16), the electric control unit (14), both blow Electrically connecting the blow-off valves (74, 75) individually interposed in the circuits (71, 72);
The low speed blow circuit (71) is opened during low speed casting, and the closing operation of the open / close valve (65) is supported by the operating cylinder (68). The high speed blow circuit (72) is opened during normal casting, and the high speed blow circuit (72 ) The degassing device (16) can be at least cleaned by blowing compressed air in the direction opposite to the suction direction of the gas (A) to the degassing device (16). Vacuum device for mold cavity.

In the vacuum apparatus with a blow of Claim 8 , the electric control part (4) newly sets the vacuum degree at the time of stable casting as positive, the blow pressure setting part (46) which sets an upper limit and a minimum, and from a blow stop to the time of measurement The blow time setting unit (47) that determines the predetermined time Δt of the valve and the alarm unit (45) are electrically connected, and the suction path opening / closing valve (43) is closed when the mold is opened, and the suction air path (5) is opened from the cavity (C). While stopping the suction of gas (A) into
By opening the blow passage opening / closing valve (74) of the high-speed blow circuit (72) and sending the compressed air in the direction opposite to the suction direction of the gas (A) to the gas venting device (16), the suction air passage (5) The clogging of the degassing device (16) is detected by the residual pressure state after the elapse of a fixed time Δt determined by the blow time setting unit (47) and the blow pressure setting unit (46) from the suction stop, and an alarm unit (45) A vacuum apparatus for a mold cavity, characterized in that it can be operated.

The vacuum device with blow according to claim 8 or 9 , wherein the vacuum device with lubrication means comprises lubrication means (8) for the valve-type gas venting device (16).
The lubricating means (8) includes at least an oil storage tank (81) for the lubricating oil R, an oil feeding pump (82), and an oil feeding passage (83) continuous to the degassing device (16), and the lubricating means (8). A mold cavity vacuum apparatus characterized in that the passive valve (64) and the open / close valve (65) can be lubricated by the above.