JP2008044007A - Low-pressure casting apparatus and method for filling inert gas - Google Patents

Low-pressure casting apparatus and method for filling inert gas Download PDF

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JP2008044007A
JP2008044007A JP2007106639A JP2007106639A JP2008044007A JP 2008044007 A JP2008044007 A JP 2008044007A JP 2007106639 A JP2007106639 A JP 2007106639A JP 2007106639 A JP2007106639 A JP 2007106639A JP 2008044007 A JP2008044007 A JP 2008044007A
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molten metal
inert gas
chamber
stalk
mold
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Shinya Mizuno
慎也 水野
Yutaka Murata
裕 村田
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Sintokogio Ltd
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Sintokogio Ltd
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Priority to JP2007106639A priority Critical patent/JP2008044007A/en
Publication of JP2008044007A publication Critical patent/JP2008044007A/en
Priority to US12/596,112 priority patent/US8191608B2/en
Priority to JP2009511757A priority patent/JP4561930B2/en
Priority to CN200880012074XA priority patent/CN101657282B/en
Priority to PCT/JP2008/056924 priority patent/WO2008132991A1/en
Priority to MX2009011172A priority patent/MX2009011172A/en
Priority to KR1020097023331A priority patent/KR101022140B1/en
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  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-pressure casting apparatus which can make a space formed above a molten metal in a pressurization chamber simply communicate with a stalk protrusively provided from a pouring port in a mold, or a guide hole connected to the pouring port in the mold to allow an inert gas to be filled into the stalk or a guide hole. <P>SOLUTION: The low-pressure casting apparatus comprises a molten metal holding chamber 1 for holding a molten metal, a pressurization chamber 2 which is in communication with the molten metal holding chamber through a communication hole 4 and faces the lower end of a stalk 8 or is connected to the other end of a guide hole 21 for pressurizing the molten metal by an inert gas, an opening/closing valve 5 for opening and closing the communication hole, a level sensor 9, and an inert gas supply means for supplying an inert gas to the top of the pressurization chamber, the level sensor provided for sensing the upper surface level of the molten metal in the pressurization chamber in which, when the upper surface of the molten metal within the pressurization chamber is pressurirzed by an inert gas to fill the molten metal into a mold, and after the filled molten metal is solidified, the communication hole is opened to return the molten metal in the pressurization chamber to the molten metal holding chamber, and the space formed above the molten metal in the pressurization chamber can be made communicate with the inside of the stalk or the inside of the guide hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description


本発明は、低圧鋳造装置および不活性ガスの充満方法に関する。
The present invention relates to a low pressure casting apparatus and an inert gas filling method.

従来、鋳造機の構成を複雑にすることなく、鋳型とストークと保持炉内の空気を効率的に非酸化ガスに置換し得る低圧鋳造機として、次のように構成されたものが提案されている。すなわち、この低圧鋳造機は、略気密状に密閉された保持炉と、この保持炉へ非酸化性ガスを供給するガス体供給手段と、前記保持炉と鋳型とを連通するストークと、このストークの保持炉側への開口部を保持炉内の溶湯に浸漬される鋳造位置と、前記開口部の少なくとも一部を保持炉内の溶湯面よりも上側に開口させた位置変換とに位置切り換える位置切り換え手段とを備え、前記ストークを置換位置へ移動させた状態で、保持炉内へ非酸化ガスを供給して、保持炉とストークと鋳型内の空気を非酸化性ガスで置換可能に構成されている。
特開２０００−４２７１５号公報 Conventionally, as a low-pressure casting machine that can efficiently replace the mold, the stalk, and the air in the holding furnace with non-oxidizing gas without complicating the structure of the casting machine, the following one has been proposed. Yes. That is, the low-pressure casting machine includes a holding furnace that is hermetically sealed, a gas supply unit that supplies a non-oxidizing gas to the holding furnace, a stalk that communicates the holding furnace and the mold, and the stalk. A position for switching the position between the casting position where the opening to the holding furnace side is immersed in the molten metal in the holding furnace and the position conversion where at least a part of the opening is opened above the molten metal surface in the holding furnace Switching means, and the non-oxidizing gas is supplied into the holding furnace in a state where the stalk is moved to the replacement position, and the holding furnace, the stalk and the air in the mold can be replaced with the non-oxidizing gas. ing.
JP 2000-42715 A

しかし、このように構成された従来の低圧鋳造機では、保持炉とストークと鋳型内の空気を非酸化性ガスで置換させるたび毎に保持炉を昇降させる必要があるため、鋳造のサイクルタイムが長くて生産性や効率が悪く、しかも、構造が複雑になり、その上、保持炉の蓋とストークとの間の密閉性が十分に確保できないなどの問題があった。
However, in the conventional low pressure casting machine configured in this way, it is necessary to raise and lower the holding furnace every time the holding furnace, the stalk and the air in the mold are replaced with non-oxidizing gas. It is long and inferior in productivity and efficiency, and has a complicated structure. Further, there is a problem that a sufficient sealing property between the holding furnace lid and the stalk cannot be secured.


本発明は、上記の事情に鑑みてなされたもので、その目的は、加圧室内における溶湯の上方に形成される空間と、鋳型の注湯口から垂設されたストークまたは鋳型の注湯口に接続する誘導孔とを簡単に連通させて、ストーク内または誘導孔内に不活性ガスを充満させることが可能な低圧鋳造装置および不活性ガスの充満方法を提供することにある。
The present invention has been made in view of the above circumstances, and its purpose is to connect a space formed above the molten metal in the pressurizing chamber and a stalk or a mold pouring port suspended from the mold pouring port. An object of the present invention is to provide a low-pressure casting apparatus and a method for filling an inert gas that can easily communicate with the induction hole to fill the inert gas in the stalk or the induction hole.


上記の問題を解消するために本発明における低圧鋳造装置は、溶湯の上面を不活性ガスにより加圧して鋳型の注湯口から垂設されたストークまたは鋳型の注湯口に接続する誘導孔を介して溶湯を鋳型に充填するようにした鋳造装置であって；溶湯を保持する溶湯保持室と；この溶湯保持室に連通孔を介し連通可能にして配設され前記ストークの下端が臨みまたは前記誘導孔の他端が接続しかつ不活性ガスによって溶湯を加圧する加圧室と；前記連通孔を開閉する開閉弁と；前記加圧室内の溶湯の上面を不活性ガスにより加圧して溶湯を前記鋳型に充填し、充填された溶湯が凝固したのち前記連通孔を開いて前記加圧室内の溶湯を前記溶湯保持室に戻した時に、前記加圧室内における溶湯の上方に形成される空間と前記ストーク内または前記誘導孔内とが連通可能となる前記加圧室内における溶湯の上面レベルを検知するレベルセンサーと；前記加圧室の上部に不活性ガスを供給する不活性ガス供給手段と；を備えたことを特徴とする。
In order to solve the above problems, the low-pressure casting apparatus according to the present invention pressurizes the upper surface of the molten metal with an inert gas and connects it to the stalk suspended from the mold pouring port or the induction hole connected to the mold pouring port. A casting apparatus in which a molten metal is filled in a mold; a molten metal holding chamber for holding molten metal; and a lower end of the stalk that faces the molten metal holding chamber through a communication hole. A pressurizing chamber that is connected to the other end of the mold and pressurizes the molten metal with an inert gas; an on-off valve that opens and closes the communication hole; and an upper surface of the molten metal in the pressurizing chamber is pressurized with an inert gas to form the molten metal into the mold. When the molten metal filled is solidified and the communication hole is opened to return the molten metal in the pressurized chamber to the molten metal holding chamber, the space formed above the molten metal in the pressurized chamber and the stalk Within or said invitation A level sensor for detecting an upper surface level of the molten metal in the pressurizing chamber capable of communicating with the inside of the hole; and an inert gas supply means for supplying an inert gas to the upper portion of the pressurizing chamber. And

このように構成されたものは、不活性ガス供給手段により加圧室における溶湯の上方に不活性ガスが供給されとともに、不活性ガスが逃がされて加圧室内の溶湯の上方の空間が過剰圧力になるのを防止されながら、溶湯保持室と加圧室とを連通させる連通孔が開かれて溶湯保持室内の溶湯が加圧室内に供給されたのち、溶湯保持室と加圧室とを連通させる連通孔が閉じられる。次いで、不活性ガス供給手段によりより圧力の高い不活性ガスが加圧室に供給されて溶湯が加圧され、これにより、加圧室の溶湯がストークまたは誘導孔を介して鋳型の製品キャビティ内に充填される。鋳型の製品キャビティ内に充填された溶湯が凝固したのち、連通孔が開かれて、加圧室の溶湯が下降してレベルセンサーがその上面レベルを検知するまで、加圧室内の溶湯が溶湯保持室内に戻されるとともに、加圧室における溶湯の上方の空間とストークまたは誘導孔とが連通される。これに伴い、加圧室内の不活性ガスがストーク内または誘導孔内に流入することとなる。この結果、その後、誘導孔内の溶湯が空気に晒されるのを防ぐことが可能になる。 In such a configuration, the inert gas is supplied by the inert gas supply means above the molten metal in the pressurizing chamber, and the inert gas is released so that the space above the molten metal in the pressurized chamber is excessive. The communication hole that connects the molten metal holding chamber and the pressurizing chamber is opened and the molten metal in the molten metal holding chamber is supplied to the pressurized chamber while being prevented from becoming pressure. The communication hole for communicating is closed. Then, an inert gas having higher pressure is supplied to the pressurizing chamber by the inert gas supply means to pressurize the molten metal, whereby the molten metal in the pressurizing chamber passes through the stalks or the induction holes in the product cavity of the mold. Filled. After the molten metal filled in the product cavity of the mold solidifies, the communication hole is opened, and the molten metal in the pressurized chamber is held until the molten metal in the pressurized chamber descends and the level sensor detects the upper surface level. While returning to the room, the space above the molten metal in the pressurizing chamber communicates with the stalk or the guide hole. Along with this, the inert gas in the pressurized chamber flows into the stalk or the induction hole. As a result, it is possible to prevent the molten metal in the guide hole from being exposed to air thereafter.

上記の説明から明らかなように本発明は、加圧室内の溶湯の上面を不活性ガスにより加圧して溶湯を鋳型に充填し、充填された溶湯が凝固したのち連通孔を開いて加圧室内の溶湯を溶湯保持室に戻した時に、加圧室内における溶湯の上方に形成される空間とストーク内または誘導孔内とが連通可能となる加圧室内の溶湯の上面レベルを検知するレベルセンサーを設けたから、鋳型に充填された溶湯が凝固したのち、レベルセンサーが加圧室の溶湯の上面レベルを検知するまで加圧室内の溶湯を溶湯保持室内に戻すことにより、加圧室の溶湯の上方空間と、ストークまたは誘導孔とを連通させて加圧室内の不活性ガスをストーク内または誘導孔内に流入させることが可能になるため、誘導孔内の溶湯の表面が空気に晒されることがなく、ストーク内または誘導孔内の溶湯に酸化膜が生成されるのを適確に防止することができるなどの優れた実用的効果を奏する。 As is apparent from the above description, the present invention applies pressure to the upper surface of the molten metal in the pressurizing chamber with an inert gas to fill the mold with the molten metal, and after the filled molten metal has solidified, the communication hole is opened to open the communication chamber. A level sensor that detects the upper surface level of the molten metal in the pressurizing chamber that allows the space formed above the molten metal in the pressurizing chamber to communicate with the inside of the stalk or the guide hole when the molten metal is returned to the molten metal holding chamber. Since the molten metal filled in the mold is solidified, the molten metal in the pressurizing chamber is returned to the molten metal holding chamber until the level sensor detects the upper surface level of the molten metal in the pressurizing chamber. Since the space and the stalk or the induction hole communicate with each other to allow the inert gas in the pressurized chamber to flow into the stalk or the induction hole, the surface of the molten metal in the induction hole may be exposed to air. Not a stow It exhibits an excellent practical effects such that the molten metal oxide film of the inner or induction hole is generated can be prevented accurately.

本発明を適用した低圧鋳造装置の実施例について図１〜図４に基づき詳細に説明する。図１に示すように、本低圧鋳造装置は、溶湯を保持する溶湯保持室１と、この溶湯保持室１に連通可能にして配設され不活性ガスによって溶湯を加圧する加圧室２と、前記溶湯保持室１と前記加圧室２とを補助室３を介して連通させる連通孔４を開閉する開閉弁５と、前記加圧室２の上端開口部を気密状に閉鎖する蓋部材６と、鋳型７の注湯口から垂設されこの蓋部材６を上下に貫通して前記加圧室２内に臨むストーク８と、前記蓋部材６にこれを上下に貫通して垂設され、かつ、前記加圧室２内の溶湯の上面を不活性ガスにより加圧して溶湯を前記鋳型に充填し、充填された溶湯が凝固したのち前記連通孔４を開いて前記加圧室２内の溶湯を前記溶湯保持室１に戻した時に、前記加圧室２内における溶湯の上方に形成される空間と前記ストーク８内とが連通可能となる前記加圧室２内における溶湯の上面レベルを検知するレベルセンサー９と、前記蓋部材６に設けられた不活性ガス供給孔１０に接続されて前記加圧室２の上部に不活性ガスを供給する不活性ガス供給手段（図示せず）と、で構成してある。 An embodiment of a low-pressure casting apparatus to which the present invention is applied will be described in detail with reference to FIGS. As shown in FIG. 1, the low-pressure casting apparatus includes a molten metal holding chamber 1 that holds molten metal, a pressurizing chamber 2 that is arranged to communicate with the molten metal holding chamber 1 and pressurizes the molten metal with an inert gas, An open / close valve 5 that opens and closes a communication hole 4 that allows the molten metal holding chamber 1 and the pressurizing chamber 2 to communicate with each other via an auxiliary chamber 3, and a lid member 6 that closes the upper end opening of the pressurizing chamber 2 in an airtight manner. And a stalk 8 which is suspended from the pouring port of the mold 7 and vertically penetrates the lid member 6 and faces the pressurizing chamber 2, and is vertically suspended by penetrating the lid member 6 and The upper surface of the molten metal in the pressurizing chamber 2 is pressurized with an inert gas to fill the mold with the molten metal, and after the filled molten metal has solidified, the communication hole 4 is opened to open the molten metal in the pressurized chamber 2. Is returned to the molten metal holding chamber 1 and the space formed above the molten metal in the pressurizing chamber 2 and the The pressurizing chamber is connected to a level sensor 9 that detects the upper surface level of the molten metal in the pressurizing chamber 2 that can communicate with the inside of the cap 8 and an inert gas supply hole 10 provided in the lid member 6. 2 and an inert gas supply means (not shown) for supplying an inert gas.

そして、前記不活性ガス供給手段においては、不活性ガスを貯蔵したタンクが開閉弁および導管を介して前記不活性ガス供給孔１０に接続してある。また、前記加圧室２の上部には、溶湯の上方の空間の圧力を大気圧とほぼ同じするために不活性ガスを排出させる排ガス孔（図示せず）が設けてあり、この排ガス孔には電磁開閉弁（図示せず）が取り付けてある。また、前記溶湯保持室１の上端開口部を閉鎖する蓋部材１１には、溶湯保持室１内の溶湯の上限レベルおよび下限レベルをそれぞれ検知するレベルセンサー１２・１３が、また、前記蓋部材６には前記加圧室２内の溶湯の上限レベルおよび中限レベルをそれぞれ検知するレベルセンサー１４・１５がそれぞれ取り付けてある。なお、中限レベルを検知するレベルセンサー１５は、前記ストーク８の下端から数ｍｍないし数十ｍｍ高い溶湯の上面レベルを検知するようになっている。 And in the said inert gas supply means, the tank which stored the inert gas is connected to the said inert gas supply hole 10 through the on-off valve and the conduit | pipe. Further, an exhaust gas hole (not shown) for discharging an inert gas is provided in the upper part of the pressurizing chamber 2 so that the pressure in the space above the molten metal is almost equal to the atmospheric pressure. Is equipped with an electromagnetic on-off valve (not shown). Further, the lid member 11 that closes the upper end opening of the molten metal holding chamber 1 is provided with level sensors 12 and 13 that detect the upper limit level and the lower limit level of the molten metal in the molten metal holding chamber 1, respectively. Are equipped with level sensors 14 and 15 for detecting the upper limit level and the middle level of the molten metal in the pressurizing chamber 2, respectively. The level sensor 15 for detecting the intermediate level detects the upper surface level of the molten metal several mm to several tens of mm higher than the lower end of the stalk 8.

このように構成したものは、不活性ガス供給手段により不活性ガス供給孔１０から加圧室２における溶湯の上方に不活性ガスが供給されとともに、排ガス孔から不活性ガスが逃がされて加圧室２内の溶湯の上方の空間が過剰圧力になるのを防止されながら、まず、開閉弁５が作動されて連通孔４が開かれ、溶湯保持室１内の溶湯が加圧室２内に供給され、レベルセンサー１４が加圧室２内の溶湯の上限レベルを検知した時、開閉弁５が作動されて連通孔４が閉じられる。次いで、より圧力の高い不活性ガスが不活性ガス供給孔１０から供給されて加圧室２内の溶湯が加圧され、加圧室２の溶湯がストーク８を介して鋳型６の製品キャビティ内に充填され（図２−Ａ参照）、鋳型６の製品キャビティ内の溶湯が凝固したのち、開閉弁５が作動されて連通孔４が開かれ、加圧室２内の溶湯が溶湯保持室１内に戻り（図２−Ｂ参照）、レベルセンサー９が加圧室２内の溶湯の高さを検知した時、開閉弁５が作動されて連通孔４が閉じられる。（図２−Ｃ参照）。 In this configuration, the inert gas is supplied from the inert gas supply hole 10 to the upper side of the molten metal in the pressurizing chamber 2 by the inert gas supply means, and the inert gas is released from the exhaust gas hole and added. While preventing the space above the molten metal in the pressure chamber 2 from becoming an excessive pressure, first, the on-off valve 5 is operated to open the communication hole 4, and the molten metal in the molten metal holding chamber 1 is moved into the pressurizing chamber 2. When the level sensor 14 detects the upper limit level of the molten metal in the pressurizing chamber 2, the on-off valve 5 is actuated to close the communication hole 4. Next, an inert gas having a higher pressure is supplied from the inert gas supply hole 10 to pressurize the molten metal in the pressurizing chamber 2, and the molten metal in the pressurizing chamber 2 passes through the stalk 8 in the product cavity of the mold 6. After the molten metal in the product cavity of the mold 6 is solidified, the on-off valve 5 is actuated to open the communication hole 4, and the molten metal in the pressurizing chamber 2 becomes the molten metal holding chamber 1. Returning to the inside (see FIG. 2B), when the level sensor 9 detects the height of the molten metal in the pressurizing chamber 2, the on-off valve 5 is operated and the communication hole 4 is closed. (See FIG. 2-C).

そして、レベルセンサー１５が加圧室２内の溶湯の高さを検知した時に、不活性ガス供給孔１０から供給される不活性ガスの圧力が低くなるように制御されて、不活性ガスは溶湯をストーク８内に巻き込まれないよう静かにストーク８内に流入する。 And when the level sensor 15 detects the height of the molten metal in the pressurizing chamber 2, the pressure of the inert gas supplied from the inert gas supply hole 10 is controlled to be low, and the inert gas is melted. Gently flows into the stalk 8 so as not to get caught in the stalk 8.

次いで、排ガス孔からの不活性ガスの排出により加圧室２における溶湯の上方の空間の圧力が大気圧とほぼ同じになったのち、溶湯が凝固してなる鋳物が鋳型６から取り出される。 Next, after the inert gas is discharged from the exhaust gas hole, the pressure in the space above the molten metal in the pressurizing chamber 2 becomes substantially the same as the atmospheric pressure, and then the casting formed by solidifying the molten metal is taken out from the mold 6.

なお、本低圧鋳造装置では、鋳型７の上鋳型を下鋳型から分離したのち、製品キャビティ内から溶湯が凝固して成る鋳物を取り出し、続いて、鋳型７の上鋳型を下鋳型に重ねて製品キャビティを画成することにより、この製品キャビティ内に、加圧室内２の不活性ガスをストーク８を介して流入させ充満させることもできる。   In this low pressure casting apparatus, after the upper mold of the mold 7 is separated from the lower mold, the casting formed by solidification of the molten metal is taken out from the product cavity, and then the upper mold of the mold 7 is stacked on the lower mold to obtain the product. By defining the cavity, the inert gas in the pressurized chamber 2 can be caused to flow into the product cavity via the stalk 8 to be filled.

またなお、前記溶湯保持室１から供給された前記加圧室２内の溶湯に前記ストーク８の下端を浸漬させた状態で、その下端開口の一部が前記加圧室２の溶湯面よりも上側に開口するよう図３−Ａおよび図３−Ｂに示すように、前記ストーク８の下端部を、斜めに開口あるいは断続的に開口した形状にして、不活性ガスによる加圧によって溶湯がより円滑にストーク８内に流入させることができる。   In addition, in a state where the lower end of the stalk 8 is immersed in the molten metal in the pressurizing chamber 2 supplied from the molten metal holding chamber 1, a part of the lower end opening is more than the molten metal surface of the pressurizing chamber 2. As shown in FIG. 3A and FIG. 3B so as to open upward, the lower end portion of the stalk 8 is formed in an obliquely open or intermittently open shape so that the molten metal is more pressurized by pressurization with an inert gas. It is possible to smoothly flow into the stalk 8.

またなお、上述の実施例では、加圧室２内の溶湯をストーク８を介して鋳型６の製品キャビティ内に充填するようにしているが、これに限定されるものではなく、例えば、図４に示すように、加圧室２２内の溶湯を鋳型６の注湯口に誘導する誘導孔２１を加圧室２２に接続させた構造にしてもよい。この場合、上述のレベルセンサー９とおなじ機能を有するレベルセンサー２９は、前記加圧室２２内における溶湯の上方に形成される空間と誘導孔２１内とが連通可能となる前記加圧室２２内の溶湯の上面レベルを検知するようになっている。
さらになお、溶湯の上面を検知するものとして、上述の実施例では接触式のレベルセンサーを使用しているが、これに限定されるものではなく、例えば、超音波式などの非接触式のものでもよい。 In the above-described embodiment, the molten metal in the pressurizing chamber 2 is filled into the product cavity of the mold 6 via the stalk 8; however, the present invention is not limited to this. For example, FIG. As shown in FIG. 2, a structure in which a guide hole 21 for guiding the molten metal in the pressurizing chamber 22 to the pouring port of the mold 6 is connected to the pressurizing chamber 22 may be adopted. In this case, the level sensor 29 having the same function as that of the level sensor 9 described above has an inside of the pressurizing chamber 22 in which the space formed above the molten metal in the pressurizing chamber 22 can communicate with the inside of the guide hole 21. The upper surface level of the molten metal is detected.
Furthermore, although the contact type level sensor is used in the above-mentioned embodiment as a means for detecting the upper surface of the molten metal, it is not limited to this, for example, a non-contact type sensor such as an ultrasonic type. But you can.


本発明を適用した第１実施例の低圧鋳造装置の縦断面図である。It is a longitudinal cross-sectional view of the low-pressure casting apparatus of 1st Example to which this invention is applied. 図１に示す低圧鋳造装置の作動説明図である。It is operation | movement explanatory drawing of the low pressure casting apparatus shown in FIG. ストークの下端の他の実施例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other Example of the lower end of Stoke. 本発明を適用した第２実施例の低圧鋳造装置の縦断面図である。It is a longitudinal cross-sectional view of the low-pressure casting apparatus of 2nd Example to which this invention is applied.

符号の説明Explanation of symbols

１ 溶湯保持室
２ 加圧室
４ 連通孔
５ 開閉弁
８ ストーク
２１ 誘導孔

1 Melting chamber 2 Pressurizing chamber 4 Communication hole 5 On-off valve 8 Stoke 21 Guide hole

Claims (4)

溶湯の上面を不活性ガスにより加圧して鋳型の注湯口から垂設されたストークまたは鋳型の注湯口に接続する誘導孔を介して溶湯を鋳型に充填するようにした鋳造装置であって；
溶湯を保持する溶湯保持室と；
この溶湯保持室に連通孔を介し連通可能にして配設され前記ストークの下端が臨みまたは前記誘導孔の他端が接続しかつ不活性ガスによって溶湯を加圧する加圧室と；
前記連通孔を開閉する開閉弁と；
前記加圧室内の溶湯の上面を不活性ガスにより加圧して溶湯を前記鋳型に充填し、充填された溶湯が凝固したのち前記連通孔を開いて前記加圧室内の溶湯を前記溶湯保持室に戻した時に、前記加圧室内における溶湯の上方に形成される空間と前記ストーク内または前記誘導孔内とが連通可能となる前記加圧室内における溶湯の上面レベルを検知するレベルセンサーと；
前記加圧室の上部に不活性ガスを供給する不活性ガス供給手段と；
を備えたことを特徴とする低圧鋳造装置。 A casting apparatus in which the upper surface of the molten metal is pressurized with an inert gas, and the molten metal is filled into the mold through a stalk suspended from the pouring port of the mold or an induction hole connected to the pouring port of the mold;
A molten metal holding chamber for holding molten metal;
A pressurizing chamber which is arranged to be able to communicate with the molten metal holding chamber through a communication hole, has a lower end of the stalk facing or connected to the other end of the induction hole, and pressurizes the molten metal with an inert gas;
An on-off valve for opening and closing the communication hole;
The upper surface of the molten metal in the pressurizing chamber is pressurized with an inert gas to fill the mold with the molten metal, and after the filled molten metal has solidified, the communication hole is opened to allow the molten metal in the pressurized chamber to enter the molten metal holding chamber. A level sensor for detecting the upper surface level of the molten metal in the pressurizing chamber, which, when returned, allows the space formed above the molten metal in the pressurizing chamber to communicate with the stalk or the guide hole;
An inert gas supply means for supplying an inert gas to an upper portion of the pressurizing chamber;
A low-pressure casting apparatus comprising: 請求項１に記載の低圧鋳造装置において、
前記溶湯保持室から供給された前記加圧室内の溶湯に前記ストークの下端を浸漬させた状態で、その下端開口の一部が前記加圧室の溶湯面よりも上側に開口するように、前記ストークの下端部を形成したことを特徴とする低圧鋳造装置。 The low pressure casting apparatus according to claim 1,
In a state where the lower end of the stalk is immersed in the molten metal in the pressurizing chamber supplied from the molten metal holding chamber, the lower end opening is partially opened above the molten metal surface of the pressurized chamber. A low pressure casting apparatus characterized in that a lower end portion of Stoke is formed. 請求項１または２に記載の低圧鋳造装置における前記ストーク内または誘導孔内に不活性ガスを充満させる方法であって、
前記加圧室内の溶湯の上面を不活性ガスにより加圧して溶湯をストークまたは誘導孔を介して前記鋳型に充填し、充填された溶湯が凝固したのち前記連通孔を開いて、前記レベルセンサーが加圧室内の溶湯の上面レベルを検知するまで前記加圧室内の溶湯を前記溶湯保持室に戻して、加圧室内における溶湯の上方に形成される空間と、前記ストーク内または前記誘導孔内とを連通させて、前記加圧室の不活性ガスを前記ストーク内または誘導孔内に流入させることを特徴とする低圧鋳造装置における不活性ガスの充満方法。 A method of filling an inert gas in the stalk or the induction hole in the low-pressure casting apparatus according to claim 1 or 2,
The upper surface of the molten metal in the pressurizing chamber is pressurized with an inert gas, and the molten metal is filled into the mold via a stalk or induction hole. After the filled molten metal has solidified, the communication hole is opened, and the level sensor is The molten metal in the pressurized chamber is returned to the molten metal holding chamber until an upper surface level of the molten metal in the pressurized chamber is detected, and a space formed above the molten metal in the pressurized chamber, the stalk or the guide hole, The inert gas in the pressurizing chamber is caused to flow into the stalk or the induction hole so that the inert gas is filled in the low-pressure casting apparatus. 請求項１または２に記載の低圧鋳造装置における前記鋳型の製品キャビティ内に不活性ガスを充満させる方法であって、
前記加圧室内の溶湯の上面を不活性ガスにより加圧して溶湯をストークまたは誘導孔を介して前記鋳型に充填し、充填された溶湯が凝固したのち前記連通孔を開いて、前記レベルセンサーが加圧室内の溶湯の上面レベルを検知するまで前記加圧室内の溶湯を前記溶湯保持室に戻して、加圧室内における溶湯の上方に形成される空間と、前記ストーク内または前記誘導孔内とを連通させ、かつ、前記鋳型の製品キャビティを画成したのち、前記加圧室に不活性ガスを供給して製品キャビティ内に不活性ガスを充満させることを特徴とする低圧鋳造装置における不活性ガスの充満方法。

A method for filling an inert gas into a product cavity of the mold in the low-pressure casting apparatus according to claim 1 or 2,
The upper surface of the molten metal in the pressurizing chamber is pressurized with an inert gas, and the molten metal is filled into the mold via a stalk or induction hole. After the filled molten metal has solidified, the communication hole is opened, and the level sensor is The molten metal in the pressurized chamber is returned to the molten metal holding chamber until an upper surface level of the molten metal in the pressurized chamber is detected, and a space formed above the molten metal in the pressurized chamber, the stalk or the guide hole, And the product cavity of the mold is defined, and then the inert gas is supplied to the pressurizing chamber to fill the product cavity with the inert gas. Gas charging method.

JP2007106639A 2007-04-16 2007-04-16 Low-pressure casting apparatus and method for filling inert gas Pending JP2008044007A (en)

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JP2009511757A JP4561930B2 (en) 2007-04-16 2008-04-08 Low pressure casting apparatus, inert gas filling method and casting product manufacturing method
CN200880012074XA CN101657282B (en) 2007-04-16 2008-04-08 Low-pressure casting apparatus, method of inert gas filling and process for manufacturing cast article
PCT/JP2008/056924 WO2008132991A1 (en) 2007-04-16 2008-04-08 Low-pressure casting apparatus, method of inert gas filling and process for manufacturing cast article
MX2009011172A MX2009011172A (en) 2007-04-16 2008-04-08 Low-pressure casting apparatus, method of inert gas filling and process for manufacturing cast article.
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