JP2004001074A

JP2004001074A - Method and device for bringing die cavity into vacuum, method for detecting clogging of degasing device and vacuum support device

Info

Publication number: JP2004001074A
Application number: JP2003039138A
Authority: JP
Inventors: Iwao Morikawa; 森川　巌
Original assignee: DAI KK
Current assignee: DAI KK
Priority date: 2002-04-10
Filing date: 2003-02-18
Publication date: 2004-01-08
Anticipated expiration: 2023-02-18
Also published as: JP4292822B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of bringing a die cavity into vacuum utilizing the air pressure of an existing compressed air conduit and a vacuum device utilizing the principle of an aspirator. <P>SOLUTION: In the method for bringing the die cavity into vacuum, by interposing a vacuum device 1 utilizing the principle of the aspirator between the existing compressed air conduit D and a degasing device 10 which is communicated with the die cavity C, a gas A is sucked from the die cavity by utilizing the air pressure of the compressed air conduit. The vacuum device for the die cavity is provided with a vacuum tank 3 and an aspirator type T-shaped vacuum ejector 2 and the vacuum ejector is provided with a 1st air duct 51 on the side of the compressed air conduit from one connecting part 21 on one side, an external releasing part 23 on the other side, a 2nd air duct 52 between a 2nd connecting part 22 on the orthogonal side and the vacuum tank and a 3rd air duct 53 on the side of a degasing device 10 from the vacuum tank and the gas A is sucked from the die cavity C by utilizing the air pressure of the compressed air conduit. <P>COPYRIGHT: (C)2004,JPO

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を介して空気やガス等の気体を抜くための真空方法と、これに用いる真空装置、及びガス抜き装置の掃除を兼ねた目詰まり検出方法と真空支援装置に関する。
【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、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に設けるオ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、気体のも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、工場内に配管された圧縮空気管路の空気圧を利用する金型キャビテイの真空方法と、アスピレータの原理を利用した小型で安価な真空装置の提供、及びガス抜き装置の掃除を兼ねた目詰まり検出方法と真空支援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、本発明による金型キャビテイの真空方法は、請求項１として、既存圧縮空気管路と金型キャビティに連通するガス抜き装置との間にアスピレータの原理を利用した真空装置を介在し、既存圧縮空気管路の空気圧を利用して金型キャビティから気体を吸引することを特徴としている。
【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を言い、少なくとも１気圧以上の圧縮空気を送気している。
ここで金型キャビテイとは、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い、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と、開閉バルブや受動バルブ等を備えたバルブ式とが知られている。
【０００７】
また本発明の金型キャビテイ用真空装置（以下、真空装置と略す）は、請求項２として、真空タンクとアスピレータ式の真空エジェクタとを備え、真空エジェクタは略Ｔ字状を成し、一方側に第一連結部を、他方側に外部開放部を、直交側に第二連結部を備え、第一連結部から既存圧縮空気管路側に第一空気路を、第二連結部から真空タンク側に第二空気路を、真空タンクからガス抜き装置側に第三空気路を備え、第一空気路と第二空気路と第三空気路とで吸引空気路を形成し、既存圧縮空気管路の空気圧を利用して金型キャビティから気体を吸引し得るようにしている。
【０００８】
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、第一連結部に送気し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。
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。
【０００９】
請求項３として、請求項２の真空装置において、第一空気路に第一電磁弁を、第二空気路に第二電磁弁を、第三空気路に吸引路開閉弁を備え、且つ吸引空気路に少なくともフイルターを、第二電磁弁と吸引路開閉弁との間に吸引圧力計を備え、吸引圧力計より電気制御部に電気信号を送り、電気制御部にて第一電磁弁と第二電磁弁と吸引路開閉弁とを制御している。
請求項４として、請求項２，３の真空装置において、電気制御部に圧力設定部と警報部とを備え、タンク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、タンク内圧力が設定圧力以上又は以下になった時に警報部が作動して異常を知らせる。
【００１０】
ここで吸引圧力計とは、タンク内圧力を計測するものを言い、電気制御部とは、各電磁弁と吸引路開閉弁とをタンク内圧力や成形機の作動に合わせてコントロールするものを言う。
ここでフイルターとは、例えばガス抜き装置を通り抜けた気体から異物を取り除き、真空タンクへの異物の侵入を防ぐもの、既存圧縮空気管路への接続側に設け、圧縮空気内の異物を取るもの等を言う。
ここで圧力設定部とは、タンク内圧力を成形品に応じて変更するものを言い、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を言う。
【００１１】
請求項５として、請求項２，３，４の真空装置において、ガス抜き装置に対するエアブロー手段を備えており、エアブロー手段は既存圧縮空気源に対する接続路と、該接続路から型開き中にガス吸引方向と逆方向に空気を吹き込む高速ブロー回路とを備えている。
請求項６として、請求項５の真空装置において、エアブロー手段は既存圧縮空気源に対する接続路に、低速鋳造時にバルブ式ガス抜き装置の開閉バルブの閉鎖作動をサポートする低速ブロー回路を備えている。
請求項７として、請求項５，６の真空装置において、電気制御部にエアブロー手段の制御部とブロー圧設定部とブロー時間設定部とを備え、ガス抜き装置の異常時に警報部を作動し、少なくとも開閉バルブの目詰まり防止と、アルミカス等の吸引を阻止し得るようにしている。
請求項８として、請求項６，７の真空装置において、バルブ式ガス抜き装置に対する潤滑手段を備えており、潤滑手段は少なくとも潤滑油の貯油タンクと送油ポンプと送油路とを備え、送油路をガス抜き装置に接続し得るようにしている。
【００１２】
ここで既存圧縮空気源とは、圧縮空気を発生するコンプレッサーやシリンダーの外に、既存圧縮空気管路を含むものである。
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。
ここで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、開閉バルブに向けて吸引方向と逆方向に空気を送気し、開閉バルブから吸引空気路への離型剤の流入、及びアルミカスの流入を阻止するものである。
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。
【００１３】
更に、本発明のガス抜き装置に対する目詰まり検出方法は、請求項９としてガス抜き装置に接続する吸引空気路の第三空気路を閉鎖した状態で、圧縮空気源よりガス抜き装置に圧縮空気を送気し、少なくともガス抜き装置を掃除し得るようにすると共に、送気停止から一定時間経過後の圧力状態により目詰まりを検出し得るようにした。
【００１４】
本発明の目詰まり検出方に用いる真空支援装置は、請求項１０としてガス抜き装置と本発明の真空装置を含む各種真空装置との間に介在するエアブロー手段を備え、該手段は吸引空気路のガス抜き装置側に介在する吸引介在路と、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側に設ける接続路とを備え、ブロー路に路内圧センサを、接続路にフイルターを接続し、該センサからの電気信号を受ける電気制御部にて、少なくともブロー路の分岐点から各種真空装置側に設けた吸引路開閉弁と、ブロー路の分岐部から既存圧縮空気源側に設けたブロー路開閉弁とを制御する。
【００１５】
請求項１１として、請求項１０の真空支援装置において、吸引介在路とブロー路とを中継ブロックに備え、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とを備え、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良否を判定し、異常時に警報部を作動し得るようにした。
請求項１２として、請求項１０，１１の真空支援装置において、バルブ式ガス抜き装置に対する潤滑手段を備えており、潤滑手段は少なくとも潤滑油の貯油タンクと送油ポンプと送油路と油圧計と油量計とを備え、送油路をバルブ式ガス抜き装置に接続し、電気制御部にて油量と送油圧とを監視管理している。
【００１６】
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、吸引空気路の一部を担うものを言い、ブロー路とは、吸引空気路より分岐するものを言う。
ここで各種真空装置とは、本発明の真空装置を含む周知の電動式真空ポンプ（例えばピストン式）や原動機式真空ポンプ（例えばコンプレッサー式）の真空装置を言う。
ここで路内圧センサとは、ブロー路の空気圧を測定し、測定値に応じて電気制御部に信号を送るものを言い、
ここで吸引路開閉弁とブロー路開閉弁とは、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。
【００１７】
【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との間にキャビテイ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イ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との接合面の一端側にキャビテイＣに連通する溶湯路６３を、他端側に本発明の真空装置１を含む各種真空装置１１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。
【００１８】
次いで、本発明による金型キャビテイの真空方法を図１に基き説明すれば、既存圧縮空気管路ｄとガス抜き装置６との間に、アスピレータの原理を利用した真空装置１を介在し、既存圧縮空気管路ｄの空気圧を利用して金型キャビティＣから気体Ａを吸引するものである。
アスピレータの原理を利用した真空装置１は、既存圧縮空気管路ｄとチルベント式ガス抜き装置６との間に介在して使用することも可能である。
【００１９】
また、本発明による真空装置の第一実施形態を図３に基き説明すれば、真空タンク３とアスピレータ式の真空エジェクタ２とを備え、真空エジェクタ２は略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は既存圧縮空気管路ｄとの間に第一空気路５１を、第二連結部２２は真空タンク３との間に第二空気路５２を、真空タンク３とガス抜き装置６との間に第三空気路５３を備え、第一空気路５１と第二空気路５２と第三空気路５３とで吸引空気路５を形成し、図８の如く外装体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、既存圧縮空気管路ｄの空気圧を利用して金型キャビティＣから気体Ａを吸引する。
【００２０】
上記第一空気路５１に第一電磁弁４１を、第二空気路５２に第二電磁弁４２を、第三空気路５３に吸引路開閉弁４３を備え、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側の吸引空気路５とにフイルター５４を備え、且つ真空タンク３に吸引圧力計５５を設け、電気制御部４にて第一電磁弁４１と第二電磁弁４２と吸引路開閉弁４３とを制御し、ガス抜き装置６を介して金型キャビティＣから気体Ａを吸引する。
【００２１】
上記電気制御部４に圧力設定部４４と、ブザーや警告灯等の警報部４５とを備え、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し、警報部４５は少なくとも図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異常を知らせる。
【００２２】
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、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、第一及び第二電磁弁４１，４２と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及び第二電磁弁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。
【００２３】
金型キャビティＣに溶湯を充填し製品を形成する間に、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内の圧力が設定圧力まで低下した時、第一及び第二電磁弁４１，４２とを開放し、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。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内は減圧する。
【００２４】
本発明による真空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４の如くガス抜き装置６のエアブロー手段７を備えており、エアブロー手段７は既存圧縮空気源Ｄへの接続路７３に、バルブ式ガス抜き装置１６における開閉バルブ６５の閉鎖作動をサポートする低速ブロー回路７１と、第三空気路５３のガス抜き装置１６側に接続する高速ブロー回路７２とを備え、低速ブロー回路７１はブロー路開閉弁７４とレギュレターとを設け、電気制御部４にエアブロー手段７の制御部とブロー圧設定部４６とブロー時間設定部４７とを備え、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の動きをサポートする作動シリンダ６８を強制的に作動し、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はブロー開閉弁７５を備え、型開き中に吸引方向と逆方向に空気を吹き込み、アルミカス等を吹き飛ばし、特に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の目詰まり防止、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。
【００２５】
本発明による真空装置の第三実施形態を、第一及び第二実施形態と相違する点について説明すると、図５の如くガス抜き装置６の潤滑手段８を備えており、潤滑手段８は潤滑油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。
【００２６】
本発明による真空装置の第四実施形態を、第一乃至第三実施形態と相違する点について説明すると、図９の如く真空装置１に、第二実施形態において用いたエアブロー手段７と、第三実施形態において用いた潤滑手段８とを備え、真空装置１とエアブロー手段７と潤滑手段８とを電気制御部４にて制御している。
【００２７】
本発明による真空装置の第五実施形態を、第一乃至第四実施形態と相違する点図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から空気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。
警報部４５は、真空タンク３内の圧力が設定圧力以上、及び設定圧力以下になった時に作動すると共に、且つガス抜き装置６の目詰まりが生じたり、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。
【００２８】
本発明によるガス抜き装置の目詰まり検出方法を図１２と図１３に基づき説明すれば、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よりガス抜き装置６に圧縮空気を送気し、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、送気停止から一定時間Δｔ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。
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、キャビテイＣ内の気体Ａが抜けないことを示す。
【００２９】
本発明による真空支援装置の第一実施形態を図１２と図１３に基づき説明すれば、真空支援装置９はガス抜き装置６と本発明の真空装置１を含む各種真空装置１１との間に介在するエアブロー手段１７を備え、該手段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側に設ける接続路９３とを備え、ブロー路９２に路内圧センサ９８を、接続路９３にフイルター９９とブロー路開閉弁９４とを接続し、該センサ９８からの電気信号を受ける電気制御部１４により、少なくともブロー路９２の分岐点から各種真空装置１１側の吸引空気路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。
吸引路開閉弁４３を真空支援装置９に設けることも可能である。
【００３０】
吸引介在路９１とブロー路９２とを図１５の如く中継ブロック１９に備え、吸引介在路９１の一端側に各種真空装置１１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。
電気制御部１４は図１４の如く、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。
【００３１】
真空支援装置の第二実施形態を第一実施形態と相違する点を説明すれば、第二実施形態の真空支援装置は、図１７の如くガス抜き装置６に対する潤滑手段１８を備えており、潤滑手段１８は本発明真空装置１の潤滑手段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からガス抜き装置６への接続を可能となり、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。
【００３２】
【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。
【００３３】
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。
【００３４】
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、キャビテイＣ内のガスが抜けないことを示す。
【００３５】
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。
【００３６】
エアブロー手段７を備えた真空装置１において、既存圧縮空気源Ｄに対する接続路接続口７３ａと、バルブ式ガス抜き装置１６に対す低速ブロー回路接続口７１ａを備え、潤滑手段８を備えた真空装置１において、バルブ式ガス抜き装置１６に対する送油路接続口８３ａを備えている。
真空支援装置９において、中継ブロック１９の第一接続口９ａと各種真空装置１１、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。
エアブロー手段７を備えた真空装置１と、目詰まり検出方法と、真空支援装置９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。
【００３７】
エアブロー手段７を備えた本発明の真空装置１、及び真空支援装置９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８を備えた本発明の真空装置１、及び真空支援装置９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１，９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。
【００３８】
【発明の効果】
本発明の金型キャビテイの真空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。
アスピレータの原理を利用した真空装置を用い、既存圧縮空気管路の空気圧を利用し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。
【００３９】
また、本発明による金型キャビテイの真空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。
請求項２に記載の真空装置は、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。
【００４０】
請求項３，４に記載の真空装置は、請求項２の効果に加えて、第一空気路の第一電磁弁と、第二空気路の第二電磁弁と、第三空気路の吸引路開閉弁とを、電気制御部にて制御し得るので、タンク内圧力が成形機の作動毎に低下しても、圧力変動に応じて電磁弁を開閉するので、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。
吸引フイルターにより、ガス抜き装置を通り抜けた気体から異物を取り除き、真空タンクへの異物の侵入を防ぐこともできる。
【００４１】
請求項５に記載の真空装置は、請求項２，３，４の効果に加えて、エアブロー手段の高速ブロー回路から型開き中にガス吸引方向と逆方向に空気を吹き込むことができるので、例えガス抜き装置にアルミカスが詰まっても、これを吹き飛ばすことができる。特にバルブ式ガス抜き装置におけるアルミカスの目詰まり防止に有効である。
請求項６に記載の真空装置は、請求項５の効果に加えて、エアブロー手段に低速ブロー回路を備えているので、バルブ式ガス抜き装置の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。
請求項７に記載の真空装置は、請求項５，６の効果に加えて、電気制御部に低速ブロー回路と高速ブロー回路との制御部、及び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、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、バルブ式ガス抜き装置における開閉バルブの目詰まり防止に有効である。
請求項８に記載の真空装置は、請求項６，７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おいて往復動するバルブ類の摺動を円滑にすることができる。
【００４２】
更に、本発明によるガス抜き装置の目詰まり検出方法は、上記の通りであるから、次に記載する効果を奏する。
ガス抜き装置に接続する吸引空気路を閉鎖し、圧縮空気源よりガス抜き装置に圧縮空気を送気するので、圧縮空気源の接続部からガス抜き装置内に付着したアルミカス等を吹き飛ばし、正常な状態を長く保つことができる。
特に、ガス抜き装置に対する圧縮空気の送気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、ガス抜き装置に目詰まりを生じていると思われるので、目詰まりによる製品不良の発生を未然に防止したり、ガス抜き装置の損傷も防げる。
【００４３】
本発明によるガス抜き装置の真空支援装置は、上記の通りであるから、次に記載する効果を奏する。
請求項１０に記載の真空支援装置は、ガス抜き装置と本発明の真空装置を含む各種真空装置との間に介在すると、型開き中に吸引方向と逆方向に空気を送気するため、例えバルブ式ガス抜き装置の開閉バルブや、チルベント式ガス抜き装置のガス抜き路にアルミカスが付着しても、これを吹き飛ばすことができる。
特に、バルブ式ガス抜き装置にあっては、開閉バルブの弁面に塗布される離型剤の吸い込みも阻止し得る。
請求項１１に記載の真空支援装置は、請求項１０の効果に加えて、吸引介在路とブロー路とを中継ブロックに備えているので、支援装置をコンパクトに、しかも簡便に構成し得る。また、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とを備えているので、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、警報を発することで、鋳造トラブルを未然に解消できる。
請求項１２に記載の真空支援装置は、請求項１０，１１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のバルブ類の摺動性を維持し、安定作動に貢献する。
【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】真空装置の第二実施形態の使用例を示す要部概略図である。
【図５】真空装置の第三実施形態の要部概略図である。
【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）真空装置の正面図と背面図である。
【図９】真空装置の第四実施形態の使用例を示す要部概略図である。
【図１０】真空装置の第五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）本発明による真空支援装置の正面図と側面図である。
【図１３】真空支援装置の第一実施形態を示す概略図である。
【図１４】真空支援装置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】真空支援装置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側面図である。
【符号の説明】
１　真空装置、１１　各種真空装置
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　真空支援装置
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]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vacuum method for removing gas such as air or gas from a mold cavity through a gas removal device, a vacuum device used for the same, and a clogging detection method that also serves to clean the gas removal device and a vacuum method. It relates to a support 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 cavity to form a nest in the product. This was to prevent outbreaks and to ensure that the material reached 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 devices (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 oil mist trap 107 provided for 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, a valve type having a passive valve or an opening / closing valve, and a chill vent type having a zigzag gas suction path between a movable type and a fixed type are known. The passive valve operates, and the operation of the valve is transmitted to the opening and closing valve, and the opening and closing valve is closed, so that the aluminum suction blocking effect is high, and the chill vent type has no moving parts, so it is possible to reduce the size and use it in a small casting machine. It is valid. In any of the degassing devices, when 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 free.
On the other hand, in a casting factory or the like using a mold, a compressed air pipe is appropriately provided in the factory in order to use tools and machines that are operated by air pressure.
[0004]
[Problems to be solved by the invention]
Since the suction means connected to the casting machine or the like is integrally provided with the electric vacuum pump or the prime mover vacuum pump and the related equipment, there is a problem that the apparatus becomes large, the arrangement place is troublesome, and the cost is high. At the same time, there is a problem that handling requires a high degree of skill. 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 the release agent is applied in this state, moisture flows into the suction side from the valve, and a good state is obtained. There were also problems that could not be maintained. Furthermore, even if the gas venting device is of a valve type or a chill vent type, some measures have been required because the aluminum scum may be clogged and clogged during use.
Therefore, the present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a mold cavity utilizing the air pressure of a compressed air pipe installed in a factory. It is an object of the present invention to provide a vacuum method, a small and inexpensive vacuum apparatus utilizing the principle of an aspirator, and a clogging detection method which also serves to clean a gas venting apparatus and a vacuum support apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a vacuum method for a mold cavity according to the present invention is characterized in that a vacuum utilizing the principle of an aspirator is provided between an existing compressed air pipe and a gas venting device communicating with a mold cavity. It is characterized in that gas is sucked from the mold cavity by using the air pressure of the existing compressed air line through the device.
[0006]
Here, the existing compressed air pipeline is a pipeline of compressed air that is piped in the factory, and sends compressed air of at least 1 atm.
Here, the mold cavity refers to a product forming space provided between the movable mold and the fixed mold, and is provided in a casting mold, a die cast mold, an injection mold, or the like.
Here, the gas refers to air trapped in the cavity by clamping the molding die, gas generated from the molten metal filled in the cavity, and the like, and the degassing device refers to a movable die of the molding die. It consists of a movable mold to be attached and a fixed mold to be attached to the fixed mold.The mold is closed and the mold is opened at the same time as the molding mold, enabling the suction of gas from inside the cavity when the mold is closed and preventing the suction of melt. There are known a chill vent type in which a gas vent path is provided in a zigzag manner between a mold and a fixed mold, and a valve type including an open / close valve, a passive valve, and the like.
[0007]
The vacuum apparatus for mold cavities of the present invention (hereinafter, abbreviated as a vacuum apparatus) includes a vacuum tank and an aspirator-type vacuum ejector, and the vacuum ejector has a substantially T-shape. A first connecting portion, an external opening portion on the other side, a second connecting portion on the orthogonal side, a first air passage from the first connecting portion to the existing compressed air pipe side, and a vacuum tank side from the second connecting portion. A second air passage, a third air passage from the vacuum tank to the degassing device side, and a suction air passage formed by the first air passage, the second air passage, and the third air passage; The gas pressure can be sucked from the mold cavity by utilizing the air pressure.
[0008]
Here, the vacuum tank has a capacity necessary for at least one cycle of the molding die, and means that the gas in the mold cavity is sucked in as short a time as possible to approximate a vacuum state.
Here, the vacuum ejector discharges the compressed air sent to the first connection portion from the external opening portion to the outside world, and is guided by the flow of the compressed air to suck air from the second connection portion, that is, the vacuum tank. Things.
Here, the first air path of the suction air path means a means interposed between the vacuum ejector and the existing compressed air pipe to stabilize the air pressure, remove foreign substances mixed in the compressed air, and the like. Two air passages are those that are interposed between the vacuum ejector and the vacuum tank, enable suction from inside the vacuum tank, and prevent backflow into the vacuum tank. It refers to one that is interposed between the degassing device and mainly prevents foreign substances from being mixed in from the degassing device.
[0009]
According to a third aspect of the present invention, in the vacuum apparatus of the second aspect, a first solenoid valve is provided in the first air passage, a second solenoid valve is provided in the second air passage, and a suction passage opening / closing valve is provided in the third air passage. At least a filter in the path, a suction pressure gauge is provided between the second solenoid valve and the suction path opening / closing valve, an electric signal is sent from the suction pressure gauge to the electric control unit, and the first solenoid valve and the second The solenoid valve and the suction path opening / closing valve are controlled.
According to a fourth aspect, in the vacuum apparatus according to the second or third aspect, the electric control unit includes a pressure setting unit and a warning unit, and controls the pressure in the tank to reach the set pressure value every cycle of the molding die. When the pressure in the tank becomes equal to or higher than the set pressure, the alarm unit operates to notify the abnormality.
[0010]
Here, the suction pressure gauge refers to a unit that measures the pressure in the tank, and the electric control unit refers to a unit that controls each solenoid valve and the suction path opening / closing valve in accordance with the pressure in the tank and the operation of the molding machine. .
Here, the filter means, for example, one that removes foreign matter from the gas that has passed through the degassing device to prevent foreign matter from entering the vacuum tank, and that is provided on the connection side to the existing compressed air pipeline to remove foreign matter in the compressed air. Say etc.
Here, the pressure setting unit refers to a unit that changes the tank pressure according to the molded article, and the alarm unit is a visual warning light, an audible buzzer, a bell, or the like. It is a device that notifies an abnormality when the pressure becomes higher or lower.
[0011]
According to a fifth aspect of the present invention, there is provided the vacuum apparatus according to the second, third, or fourth aspect, further comprising an air blowing means for the gas releasing device, wherein the air blowing means includes a connection path to the existing compressed air source, and gas suction during opening of the mold from the connection path. A high-speed blow circuit for blowing air in a direction opposite to the direction.
According to a sixth aspect of the present invention, in the vacuum apparatus of the fifth aspect, the air blow means includes a low-speed blow circuit for supporting a closing operation of an opening / closing valve of the valve-type degassing device at a low-speed casting in a connection path to the existing compressed air source.
According to a seventh aspect, in the vacuum apparatus according to the fifth or sixth aspect, the electric control unit includes a control unit of the air blowing means, a blow pressure setting unit, and a blow time setting unit, and operates an alarm unit when the gas venting device is abnormal. At least the opening and closing valve can be prevented from being clogged, and the suction of aluminum scum and the like can be prevented.
According to an eighth aspect of the present invention, there is provided the vacuum apparatus according to the sixth or seventh aspect, further comprising lubricating means for the valve-type degassing device, wherein the lubricating means comprises at least an oil storage tank for lubricating oil, an oil feed pump and an oil feed path. The oil passage can be connected to a degassing device.
[0012]
Here, the existing compressed air source includes an existing compressed air line in addition to a compressor or a cylinder that generates compressed air.
Here, the low-speed blow circuit operates the operating cylinder for the opening / closing lever at the initial stage of molding machine start, that is, at the time of low-speed casting until the molding die is sufficiently heated, and forcibly opens / closes the valve via the opening / closing lever. A thing that operates closed.
Here, the high-speed blow circuit means that during opening of the mold at the time of high-speed casting after the molding die is sufficiently heated, air is supplied to the opening and closing valve in a direction opposite to the suction direction, and the suction air passage from the opening and closing valve. To prevent the release agent from flowing into the mold and the inflow of aluminum scum.
Here, the lubricating means means a lubricating oil that is fed to a reciprocating passive valve, an open / close valve, a protruding pin, and a sliding portion of a working cylinder in a valve-type degassing device to smooth the sliding.
Here, the blow pressure setting unit refers to a unit that sets and adjusts a blow start pressure and a measurement pressure, and the blow time setting unit refers to a unit that sets and adjusts a blow start time and a pressure reduction measurement.
[0013]
Further, according to a ninth aspect of the present invention, there is provided a method for detecting clogging of a degassing device, wherein compressed air is supplied from a compressed air source to the degassing device while the third air passage of the suction air passage connected to the degassing device is closed. Air is supplied, and at least the degassing device can be cleaned, and clogging can be detected based on a pressure state after a lapse of a predetermined time from the stop of the air supply.
[0014]
The vacuum support device used in the method for detecting clogging according to the present invention includes an air blow means interposed between a degassing device and various vacuum devices including the vacuum device according to the present invention as claim 10, and the air blow device is provided with a suction air passage. A suction intervening path intervening on the degassing device side, a blow path branching off from the suction intervening path, and a connection path provided from the blow path to the existing compressed air source side, a path pressure sensor in the blow path, and a filter in the connection path And an electric control unit that receives an electric signal from the sensor, at least a suction path opening / closing valve provided on the side of various vacuum devices from the branch point of the blow path, and from the branch part of the blow path to the existing compressed air source side. It controls the provided blow path opening / closing valve.
[0015]
According to an eleventh aspect of the present invention, in the vacuum assisting apparatus of the tenth aspect, the suction intervening path and the blow path are provided in the relay block, the electric control unit is provided with a blow pressure setting unit, a blow time setting unit, and an alarm unit. Pass / Fail is determined based on the pressure state after a certain period of time has elapsed since the start of blow to the air, and an alarm unit can be activated when an abnormality occurs.
According to a twelfth aspect of the present invention, there is provided the vacuum support apparatus according to the tenth and eleventh aspects, further comprising lubricating means for the valve-type degassing apparatus, wherein the lubricating means includes at least a lubricating oil storage tank, an oil feed pump, an oil feed path, an oil pressure gauge, An oil meter is provided, the oil supply path is connected to a valve-type degassing device, and the electric control unit monitors and manages the oil amount and the oil pressure.
[0016]
Here, the relay block refers to one that is interposed on the side of the degassing device in the suction air passage, the suction intervening passage means a portion that carries a part of the suction air passage, and the blow passage branches off from the suction air passage. Say what you do.
Here, various vacuum devices refer to vacuum devices of a well-known electric vacuum pump (for example, a piston type) or a motor type vacuum pump (for example, a compressor type) including the vacuum device of the present invention.
Here, the road pressure sensor refers to a sensor that measures the air pressure in the blow path and sends a signal to the electric control unit according to the measured value.
Here, the suction path on-off valve and the blow path on-off valve are in a relationship in which one of the two on-off valves is closed and the other is opened.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the structure of the die casting mold will be described with reference to FIG. 1. The mold B has a cavity C formed between a movable mold B1 and a fixed mold B2. Among the degassing devices 6 to be mounted, the valve type degassing device 16 includes a movable die 6a to be mounted on the movable die B1 and a fixed die 6b to be mounted on the fixed die B2, and the molten metal communicating with the cavity C to the parting line. A passage 63 is provided, a passive valve 64 is arranged on the inlet side of the molten metal passage 63, and an opening / closing valve 65 is arranged on the outlet side. An opening / closing lever 66 for transmitting the operation of the passive valve 64 to the opening / closing valve 65 is provided. The opening / closing valve 65 allows the gas A to be discharged and prevents the passage of the melt.
Of 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 of the joint surface between the movable die 6a and the fixed die 6b as shown in FIG. An exhaust path 62 communicating with the various vacuum apparatuses 11 including the vacuum apparatus 1 is provided, and a zigzag gas vent path 61 is provided between the molten metal path 63 and the exhaust path 62.
[0018]
Next, the vacuum method for mold cavities according to the present invention will be described with reference to FIG. 1. A vacuum device 1 utilizing the principle of an aspirator is interposed between an existing compressed air pipe d and a degassing device 6. The gas A is sucked from the mold cavity C using the air pressure of the compressed air line d.
The vacuum device 1 utilizing the principle of the aspirator can be used by being interposed between the existing compressed air pipe d and the chill vent type gas venting device 6.
[0019]
The first embodiment of the vacuum device according to the present invention will be described with reference to FIG. 3. The vacuum device includes a vacuum tank 3 and an aspirator-type vacuum ejector 2, and the vacuum ejector 2 has a substantially T-shape. The external opening 23, the first connecting portion 21 on the other side, the second connecting portion 22 on the orthogonal side, the first connecting portion 21 between the existing compressed air pipe d and the first air passage 51, The second connecting portion 22 includes a second air passage 52 between the vacuum tank 3 and a third air passage 53 between the vacuum tank 3 and the degassing device 6. The first air path connection port 51a and the third air path connection port 53a are provided on the back surface of the exterior body 10 as shown in FIG. The gas A is sucked from the mold cavity C using the air pressure of d.
[0020]
The first air passage 51 is provided with a first electromagnetic valve 41, the second air passage 52 is provided with a second electromagnetic valve 42, and the third air passage 53 is provided with a suction passage opening / closing valve 43. A filter 54 is provided in the first air passage 51 on the pipe line d side and the suction air passage 5 on the gas venting device 6 side from the suction passage opening / closing valve 43, and a suction pressure gauge 55 is provided in the vacuum tank 3; At 4, the first electromagnetic valve 41, the second electromagnetic valve 42, and the suction path opening / closing valve 43 are controlled, and the gas A is sucked from the mold cavity C via the gas release device 6.
[0021]
The electric control unit 4 includes a pressure setting unit 44 and a warning unit 45 such as a buzzer or a warning light. The internal pressure of the vacuum tank 3 is set to a set pressure b value for each cycle of the molding die B as shown in FIG. The alarm unit 45 notifies the abnormality when the pressure in the vacuum tank 3 becomes equal to or higher than the set pressure or equal to or lower than the set pressure as shown in FIG.
[0022]
Since the vacuum method and the vacuum apparatus according to the present invention are as described above, the first air path 51 is connected to the existing compressed air pipe d and the third air path 53 is connected to the degassing device 6 in advance. If the valve 43 is closed and the first and second solenoid valves 41 and 42 are opened at the same time, or if the first solenoid valve 41 is opened after the second solenoid valve 42, the compressed air is connected to the first connection of the vacuum ejector 2. The air flows from the part 21 to the external opening part 23 and is discharged to the external opening part 23, and accordingly, air is sucked from the vacuum tank 3 into the vacuum ejector 2 by the principle of the aspirator and released to the external opening part 23 together with the compressed air. Is done.
As a result, the pressure in the vacuum tank 3 is reduced, and the first and second solenoid valves 41 and 42 are simultaneously closed when the pressure is reduced to a predetermined pressure, or the first solenoid valve 41 is closed after the second solenoid valve 42. I do.
[0023]
If the suction passage opening / closing valve 43 is opened while filling the mold cavity C with the molten metal to form a product, the vacuum tank 3 in a depressurized state via the degassing device 6 allows the air A or gas A to be discharged from the cavity C. Is sucked. When the pressure in the vacuum tank 3 decreases to the set pressure due to the suction of the gas A from the cavity C, the first and second solenoid valves 41 and 42 are opened, and the vacuum ejector 2 sucks air from inside the vacuum tank 3. Then, the pressure inside the vacuum tank 3 is reduced to a predetermined pressure. That is, the pressure in the vacuum tank 3 is reduced every time the molding die B operates for one cycle and one product is formed.
[0024]
The second embodiment of the vacuum apparatus according to the present invention will be described in terms of differences from the first embodiment. As shown in FIG. 4, the vacuum apparatus is provided with an air blow means 7 of a degassing apparatus 6, and the air blow means 7 is provided with an existing compressed air source D. A low-speed blow circuit 71 that supports the closing operation of the on-off valve 65 in the valve-type gas venting device 16 and a high-speed blow circuit 72 that is connected to the gas venting device 16 side of the third air path 53 are provided in the connection path 73 to the valve. The low-speed blow circuit 71 is provided with a blow path opening / closing valve 74 and a regulator, and the electric control section 4 is provided with a control section of the air blow means 7, a blow pressure setting section 46 and a blow time setting section 47. That is, at the time of low-speed casting until the molding die B is sufficiently heated, the operating cylinder 68 for supporting the movement of the opening / closing lever 66 in the valve-type degassing device 16 is forcibly forced. The high-speed blow circuit 72 is provided with a blow opening / closing valve 75, and blows air in a direction opposite to the suction direction during opening of the mold to blow off aluminum scraps and the like. In particular, by blowing air in the opposite direction to the suction direction into the opening / closing valve 65 of the valve type gas venting device 16, cleaning of the third air passage 53 and the opening / closing valve 65, prevention of clogging of the opening / closing valve 65, and introduction to the suction air passage 5. Of the aluminum scum and the release agent.
[0025]
The third embodiment of the vacuum apparatus according to the present invention will be described in terms of differences from the first and second embodiments. As shown in FIG. 5, the vacuum apparatus includes a lubricating unit 8 of a degassing device 6, and the lubricating unit 8 is provided with a lubricating oil. An oil storage tank 81, an oil supply path 83, and an oil supply pump 82 are provided for the R, an electric control unit 4 is provided with a control unit for the lubricating means 8, and the oil supply path 83 is connected to the valve-type degassing device 16 to open the mold. Later, 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.
[0026]
The difference between the fourth embodiment of the vacuum apparatus according to the present invention and the first to third embodiments will be described. As shown in FIG. The electric control unit 4 controls the vacuum device 1, the air blow unit 7, and the lubrication unit 8, including the lubrication unit 8 used in the embodiment.
[0027]
The fifth embodiment of the vacuum apparatus according to the present invention is different from the first to fourth embodiments in that the vacuum tank 3 is provided with two third air passages 53 as shown in FIG. The air A can be sucked from the device 16, the air blow means 7 are provided in both the third air paths 53, and the two valve-type degassing devices 16 are lubricated by the lubrication means 8.
The alarm unit 45 is activated when the pressure in the vacuum tank 3 becomes equal to or higher than the set pressure and equal to or lower than the set pressure, and when the degassing device 6 is clogged or when the blow pressure is abnormal (such as damage to the hose, It operates even when the connector is not properly connected, etc.) or when the mold clamping is incomplete, and notifies an abnormality.
[0028]
The method for detecting clogging of the degassing device according to the present invention will be described with reference to FIGS. 12 and 13. In the state where the suction air passage 5 connected to the degassing device 6 is closed, the compressed air source D is connected to the degassing device 6. Compressed air is supplied to clean at least the degassing device 6, and clogging can be detected based on a residual pressure state after a lapse of a predetermined time Δt from the stop of the supply of air.
When the abnormality of the degassing device 6 is determined, the residual pressure after elapse of Δt during the stable casting is set to be positive. For example, the blowing to the degassing device 6 is started, and the residual pressure after Δt seconds after stopping the blowing. If the value exceeds the set value (the degree of vacuum does not decrease) as shown by the abnormal line in FIG. 16, it indicates that the gas venting device 6 or the suction air passage 5 is clogged, and that the gas A in the cavity C does not escape.
[0029]
The first embodiment of the vacuum assisting device according to the present invention will be described with reference to FIGS. 12 and 13. The vacuum assisting device 9 is interposed between the degassing device 6 and various vacuum devices 11 including the vacuum device 1 of the present invention. The air blowing means 17 includes a suction interposition path 91 interposed on the side of the degassing device 6 of the suction air path 5, a blow path 92 branched from the suction interposition path 91, and an existing compressed air source from the blow path 92. A connection path 93 provided on the D side; an in-path pressure sensor 98 connected to the blow path 92; and a filter 99 and a blow path open / close valve 94 connected to the connection path 93, and an electric control unit receiving an electric signal from the sensor 98. 14 controls the suction path on-off valve 43 and the blow path on-off valve 94 provided at least in the suction air path 5 on the side of the various vacuum devices 11 from the branch point of the blow path 92.
It is also possible to provide the suction path opening / closing valve 43 in the vacuum support device 9.
[0030]
As shown in FIG. 15, a suction intervening path 91 and a blow path 92 are provided in the relay block 19, and a first connection port 9 a for various vacuum devices 11 is provided at one end of the suction intervening path 91, and a first connection port 9 a for the degassing device 6 is provided at the other end. Two connection ports 9b are provided, and a third connection port 9c of the connection path 93 is provided at an end of the blow path 92.
As shown in FIG. 14, 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 degassing device 6, and starts blowing to the degassing device 6 and stops blowing. Then, the pass / fail state is determined based on the pressure state after a lapse of a predetermined time Δt, and the alarm unit 95 can be activated when an abnormality occurs.
[0031]
Explaining the difference between the second embodiment of the vacuum support device and the first embodiment, the vacuum support device of the second embodiment includes a lubricating means 18 for the gas release device 6 as shown in FIG. The means 18 includes 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 meter 85, similar to the lubricating means 8 of the vacuum apparatus 1 of the present invention. The connection from 83 to the degassing device 6 is enabled, and the electric control unit 14 monitors and manages the oil amount and the oil pressure to be sent, and outputs an abnormal signal when the lubricating oil R runs short.
The flow rate adjustment is basically performed by setting the discharge time of the sequencer.
[0032]
【Example】
As shown in FIG. 11, the vacuum ejector 2 has a first connecting portion 21 provided with a nozzle 26 tapering toward the outside opening portion 23, and the outside opening portion 23 having a diffuser 28 communicating with the nozzle 26 with a gap. In addition, the second connecting portion 22 is provided with a ventilation portion 27 that is open to the outside air and that is orthogonal to the space between the nozzle 26 and the diffuser 28.
If the silencer 12 is attached to the outlet side of the external open passage 23 of the vacuum ejector 2, the sound of the compressed air released from the external open passage 23 to the outside air and the air sucked from the vacuum tank 3 and released to the outside air will be emitted. Can be reduced.
[0033]
The same purpose can be achieved by providing the suction pressure gauge 55 between the vacuum tank 3 and the second solenoid valve 42 or between the vacuum tank 3 and the suction path opening / closing valve 43.
When the set vacuum degree range of the vacuum tank 3 is, for example, the upper limit is -80 Kpa (kilopascal) and the lower limit is -60 Kpa (kilopascal), when the degree of vacuum in the vacuum tank 3 exceeds -80 Kpa (kilopascal). , Or -60 Kpa (kilopascal), the alarm unit 45 is activated to notify the abnormality.
It is also possible to mount the casters 20 below the vacuum device 1 to make them movable.
[0034]
When the abnormality of the degassing device 6 is determined, the vacuum degree at the time of stable casting is set positive by the blow pressure setting units 46 and 96, and the upper and lower limits are set. After Δt seconds.
For example, when the blowing to the gas venting device 6 is started and the residual pressure after Δt seconds after stopping the blowing exceeds the set value as shown by the abnormal line in FIG. 16, an abnormal signal is issued.
That is, if the pressure does not reach the set value after the elapse of the predetermined time Δt from the stoppage of the blow (when the degree of vacuum does not decrease), it indicates that the gas venting device 6 is clogged, the hose is clogged, etc., and the gas in the cavity C is not released. Show.
[0035]
The alarm unit 95 notifies a decrease in the amount of the lubricating oil R, a decrease in the blow pressure at the time of low-speed casting, a clogging of the opening / closing valve 65 by a buzzer, a signal light, or the like. For example, when a red signal, a yellow signal, and a green signal are used, The red signal indicates when the air pressure for forcibly closing the open / close valve 65 is lower than the set value during low-speed casting (in response to this, secure the pressure of the air source pressure. When the pressure exceeds the set value for a predetermined time (confirm the opening / closing valve 65 as a response. If the opening / closing valve 65 is clogged with aluminum, remove the aluminum. If the aluminum is not clogged, change the set value. The yellow signal lights when the amount of the lubricating oil decreases (the lubricating oil R is filled up to a predetermined amount. In response, the oil pump 82 is raised to a predetermined pressure). To light.
The signal light is not limited to the red signal, the yellow signal, and the green signal, and any color light can be used.
[0036]
In the vacuum apparatus 1 provided with the air blow means 7, the vacuum apparatus 1 provided with a connection path connection port 73 a for the existing compressed air source D, a low-speed blow circuit connection port 71 a for the valve-type degassing device 16, and provided with the lubrication means 8. , An oil supply passage connection port 83a for the valve-type degassing device 16 is provided.
In the vacuum support device 9, the first connection port 9a of the relay block 19 and the various vacuum devices 11 and the second connection port 9b and the degassing device 6 are connected by hoses, and the connection path 93 of the air blow means 17 and the existing compressed air source D are connected. With a hose.
The vacuum device 1 provided with the air blow means 7, the clogging detection method, and the compressed air source D in the vacuum support device 9 which generates compressed air outside the existing compressed air pipe d piped in the factory. Use a compressor or piston.
[0037]
In the vacuum device 1 of the present invention provided with the air blowing means 7 and the vacuum support device 9, the vacuum device 1 of the present invention provided with a control to start the blow after opening the mold and further provided with the lubricating means 8, In the vacuum support device 9, it is possible to use a common signal to start blowing and lubrication after the mold is opened, or to automatically operate the two devices 1 and 9 or to manually operate them (for low speed casting, lubrication). Oil supply) is also possible.
As the lubricating oil R, for example, a machine oil having a low viscosity and no turbidity is used, and 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.
[0038]
【The invention's effect】
Since the vacuum method of the mold cavity of the present invention is as described above, the following effects can be obtained.
It uses a vacuum device based on the principle of an aspirator and draws gas from the mold cavity using the air pressure of the existing compressed air pipeline.Therefore, an electric vacuum pump or prime mover vacuum pump for obtaining compressed air Or, a piston cylinder type vacuum pump or the like becomes unnecessary. As a result, the device can be remarkably reduced in size and weight, the installation area can be reduced, and the device can be provided at low cost. Moreover, the handling operation is simplified.
[0039]
Further, since the vacuum device for the mold cavity according to the present invention is as described above, the following effects can be obtained.
The vacuum apparatus according to claim 2 employs an aspirator type vacuum ejector instead of an electric vacuum pump, a prime mover type vacuum pump, or a piston cylinder type vacuum pump for obtaining compressed air. Compared to vacuum pumps having a high capacity, the size and weight of the pump can be significantly reduced, and the pump can be provided at a low cost, and maintenance is easy. In addition, since no driving parts are used, the moving sound is quiet, and no rotary pump is used in the vacuum device, so that no waste oil is generated.
[0040]
The vacuum device according to claims 3 and 4 has, in addition to the effects of claim 2, a first solenoid valve of the first air passage, a second solenoid valve of the second air passage, and a suction passage of the third air passage. Since the open / close valve can be controlled by the electric control unit, the solenoid valve opens and closes according to the pressure fluctuation even if the tank pressure decreases each time the molding machine is operated. be able to. In addition, when the pressure in the tank becomes equal to or more than the set pressure, an alarm is issued and an abnormality is notified, so that loss can be prevented beforehand.
The suction filter also removes foreign matter from the gas passing through the degassing device, thereby preventing foreign matter from entering the vacuum tank.
[0041]
The vacuum device according to the fifth aspect has, in addition to the effects of the second, third, and fourth aspects, the fact that air can be blown from the high-speed blow circuit of the air blow means in the direction opposite to the gas suction direction during mold opening. Even if aluminum debris is clogged in the degassing device, it can be blown away. In particular, it is effective for preventing clogging of aluminum scum in a valve type gas venting device.
In the vacuum apparatus according to the sixth aspect, in addition to the effect of the fifth aspect, since the air blow means is provided with a low-speed blow circuit, the opening / closing valve of the valve-type degassing apparatus is designed at a melting speed during high-speed casting. In addition, it is possible to prevent a malfunction during low-speed casting (the initial stage until the molding die is heated) and to prevent foreign substances from entering the vacuum tank from the opening / closing valve due to the malfunction.
According to a seventh aspect of the present invention, in addition to the effects of the fifth and sixth aspects, the electric control unit further includes a control unit for a low-speed blow circuit and a high-speed blow circuit, and a blow pressure setting unit and a blow time setting unit. As a result, an alarm is issued when the gas venting device is abnormal, and the inflow of aluminum scum and the like into the vacuum device can be prevented. In particular, it is effective in preventing clogging of an opening / closing valve in a valve type gas venting device.
The vacuum device according to the eighth aspect has lubricating means in addition to the effects of the sixth and seventh aspects, so that the reciprocating valves in the valve-type degassing device can slide smoothly. .
[0042]
Further, since the method for detecting clogging of the gas venting device according to the present invention is as described above, the following effects can be obtained.
The suction air path connected to the degassing device is closed, and compressed air is sent from the compressed air source to the degassing device. The state can be kept long.
In particular, due to the pressure state after a certain period of time has elapsed since the stop of the supply of compressed air to the degassing device, that is, when the residual pressure after the lapse of the certain period of time has not dropped to the specified pressure, clogging of the degassing device occurs. Therefore, it is possible to prevent the occurrence of defective products due to clogging, and to prevent the gas venting device from being damaged.
[0043]
Since the vacuum assisting device of the gas venting device according to the present invention is as described above, the following effects can be obtained.
The vacuum assisting device according to claim 10 is provided between the degassing device and various vacuum devices including the vacuum device of the present invention, and supplies air in a direction opposite to a suction direction during mold opening. Even if aluminum scum adheres to the opening / closing valve of the valve type gas venting device or the gas venting path of the chill vent type gas venting device, it can be blown off.
In particular, in the valve type gas venting device, it is possible to prevent the release agent applied to the valve surface of the on-off valve from being sucked.
According to the eleventh aspect of the present invention, in addition to the effects of the tenth aspect, since the suction block and the blow path are provided in the relay block, the assisting device can be made compact and simple. In addition, since the electric control unit is provided with a blow pressure setting unit, a blow time setting unit, and an alarm unit, abnormalities such as clogging can be quickly detected depending on a pressure state after a lapse of a predetermined time from the start of blowing to the degassing device. By detecting the alarm and issuing an alarm, the casting trouble can be solved.
The vacuum assisting device according to the twelfth aspect is effective for a valve-type degassing device because it has lubricating means in addition to the effects of the tenth and eleventh aspects. That is, the slidability of the valves of the valve-type degassing device is maintained, which contributes 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 degasser.
FIG. 2 is a schematic view showing a vacuum method of the present invention for a mold cavity using a chill vent type degassing device.
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 schematic diagram of a main part showing an example of use of a second embodiment of the vacuum device.
FIG. 5 is a schematic view of a main part of a third embodiment of the vacuum device.
FIG. 6 is a pressure fluctuation diagram showing a relationship between a pressure in a vacuum tank and time.
FIGS. 7A and 7B are pressure state diagrams in a vacuum tank.
8A and 8B are a front view and a rear view of a vacuum device.
FIG. 9 is a schematic diagram of a main part showing an example of use of a fourth embodiment of the vacuum device.
FIG. 10 is a schematic view showing a main part of a fifth embodiment of the vacuum apparatus.
FIG. 11 is a sectional view of a vacuum ejector.
12 (a) and (b) are a front view and a side view of a vacuum support device according to the present invention.
FIG. 13 is a schematic view showing a first embodiment of the vacuum support device.
FIG. 14 is a schematic view showing a second embodiment of the vacuum support device.
FIG. 15 is a diagram illustrating a use state of a relay block.
FIG. 16 is a time series diagram showing a relationship between a normal blow time and an abnormal blow pressure.
FIG. 17 is a schematic view showing a third embodiment of the vacuum support device.
FIG. 18 is a process chart showing a casting process.
FIG. 19 is a side view showing an example of use of a conventional suction unit.
[Explanation of symbols]
1 vacuum equipment, 11 various vacuum equipment
2 vacuum ejector, 12 silencer
21 first connecting part, 22 second connecting part, 23 external opening 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 opening / closing valve, 44 pressure setting section, 45, 95 alarm section
46,96 blow pressure setting section, 47,97 blow time setting section
5 suction air passage, 51 first air passage, 52 second air passage, 53 third air passage
54,99 filter, 55 suction pressure gauge
6 degassing device, 16 valve type degassing device
6a movable type, 6b fixed type
61 Gas vent path, 62 Exhaust path, 63 Molten path, 64 Passive valve
65 opening / closing valve, 66 opening / closing lever, 67 protruding pin, 68 working 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 on-off valve
8, 18 Lubricating means, 81 Oil storage tank, 82 Oil pump, 83 Oil path
84 Oil pressure gauge, 85 Oil gauge
9 Vacuum support equipment
19 relay block, 9a, 9b, 9c connection port
91 Suction interposition path, 92 Blow path, 98 Road 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 vacuum device (1) utilizing the principle of an aspirator is interposed between the existing compressed air line (d) and the gas release device (6) communicating with the mold cavity (C), and the existing compressed air line (d) is provided. A method for vacuuming mold cavities, wherein the gas (A) is sucked from the mold cavity (C) using the air pressure of (1).

A vacuum tank (3) and an aspirator type vacuum ejector (2) are provided. The vacuum ejector (2) has a substantially T-shape, a first connecting portion (21) on one side, and an external opening portion on the other side. (23) is provided with a second connecting portion (22) on the orthogonal side, and a first air passage (51) is provided from the first connecting portion (21) to the existing compressed air pipe (d) side, and the second connecting portion ( A second air passage (52) is provided from 22) to the vacuum tank (3) side, and a third air passage (53) is provided from the vacuum tank (3) to the degassing device (6) side, and the first air passage (51) is provided. , A second air passage (52) and a third air passage (53) to form a suction air passage (5), and gas is discharged from the mold cavity (C) by utilizing the air pressure of the existing compressed air conduit (d). A vacuum device for mold cavities, wherein (A) is sucked.

A first solenoid valve (41) in the first air passage (51), a second solenoid valve (42) in the second air passage (52), and a suction passage opening / closing valve (43) in the third air passage (53). And a suction pressure gauge (55) between the second solenoid valve (42) and the suction path opening / closing valve (43), and a suction pressure gauge (55). ) To the electric control unit (4), and the electric control unit (4) controls the first solenoid valve (41), the second solenoid valve (42), and the suction path opening / closing valve (43). The vacuum apparatus for mold cavities according to claim 2, wherein

The electric control section (4) includes a pressure setting section (44) and an alarm section (45), and controls the pressure in the tank so as to reach the set pressure (b) value for each cycle of the molding die (B). 4. The vacuum apparatus for mold cavities according to claim 2, wherein an alarm unit (45) is activated to notify an abnormality when the pressure in the tank becomes equal to or higher than a set pressure.

An air blow means (7) for the degassing device (6) is provided. The air blow means (7) has a connection path (73) for the existing compressed air source (D) and a gas while opening the mold from the connection path (73). The vacuum apparatus for mold cavities according to claim 2, further comprising a high-speed blow circuit (72) for blowing air in a direction opposite to the suction direction.

An air blow means (7) is provided in a connection path (73) for the existing compressed air source (D), and a low-speed blow circuit (71) for supporting a closing operation of an opening / closing valve (65) of a valve-type degassing device (16) during low-speed casting. The vacuum apparatus for mold cavities according to claim 5, further comprising:

The electric control section (4) includes a control section for the air blow means (7), a blow pressure setting section (46), and a blow time setting section (47). 7. The vacuum apparatus for mold cavities according to claim 5, wherein the vacuum apparatus for mold cavities according to claim 5 or 6 is operated to prevent clogging of at least the degassing device (6, 16) and prevent suction of aluminum scum and the like. .

A lubricating means (8) for the valve-type degassing device (16) is provided. The lubricating means (8) includes at least an oil storage tank (81) for lubricating oil (R), an oil feed pump (82), and an oil feed path (83). The vacuum apparatus for mold cavities according to claim 6 or 7, wherein the oil supply passage (83) can be connected to the degassing device (16).

With the third air passage (53) of the suction air passage (5) connected to the degassing device (6) closed, compressed air is sent from the compressed air source (D) to the degassing device (6), Clogging detection of a gas venting device characterized in that at least the gas venting device (6) can be cleaned and clogging can be detected by a pressure state after a lapse of a predetermined time Δt from the stop of air supply. Method.

An air blow means (17) is provided between the degassing device (6) and various vacuum devices (11) including the vacuum device (1) of the present invention, and the air blow device (17) is provided with a suction air passage (5). A suction intervening path (91) interposed on the degassing device (6) side, a blow path (92) branching off from the suction intervening path (91), and an existing compressed air source (D) side provided from the blow path (92). A connection path (93), a path pressure sensor (98) connected to the blow path (92), a filter (99) connected to the connection path (93), and electric control for receiving an electric signal from the sensor (98). At a section (14), at least a branch point of the blow path (92), a suction path opening / closing valve (43) provided in the suction air path (5) on the side of various vacuum devices (11), and a branch of the blow path (92). And the blow path opening / closing valve (94) provided on the side of the existing compressed air source (D). Vacuum assist apparatus characterized by Gosuru.

The relay block (19) is provided with a suction intervening path (91) and a blow path (92), and the electric control section (14) has a blow pressure setting section (96), a blow time setting section (97), and an alarm section (95). And determining whether the pressure is good or bad based on a pressure state after a lapse of a predetermined time from the start of blowing into the degassing device (6), and activating an alarm unit (95) when an abnormality occurs. The vacuum support apparatus according to claim 10.

A lubricating means (18) for the valve-type degassing device (16) is provided. The lubricating means (18) includes at least an oil storage tank (81) for lubricating oil (R), an oil feed pump (82), and an oil feed path (83). ), An oil pressure gauge (84) and an oil meter (85), an oil supply passage (83) is connected to the gas venting device (16), and the electric control unit (14) controls the oil amount and the oil pressure. The vacuum support device according to claim 10, wherein the vacuum support device is monitored and managed.