JP2005313189A - Method for pouring molten metal in vacuum molding, and cast product - Google Patents

Method for pouring molten metal in vacuum molding, and cast product Download PDF

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Publication number
JP2005313189A
JP2005313189A JP2004132681A JP2004132681A JP2005313189A JP 2005313189 A JP2005313189 A JP 2005313189A JP 2004132681 A JP2004132681 A JP 2004132681A JP 2004132681 A JP2004132681 A JP 2004132681A JP 2005313189 A JP2005313189 A JP 2005313189A
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mold
pouring
casting
molten metal
vacuum
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JP2004132681A
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Hisaaki Ando
Hiroyasu Makino
Kenji Mizuno
Hiroaki Suzuki
Taketoshi Tomita
寿明 安藤
剛利 富田
健司 水野
泰育 牧野
浩昭 鈴木
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Sintokogio Ltd
新東工業株式会社
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Priority to JP2004132681A priority Critical patent/JP2005313189A/en
Priority claimed from PCT/JP2005/006481 external-priority patent/WO2005095022A1/en
Priority claimed from CN2005800177655A external-priority patent/CN1960822B/en
Publication of JP2005313189A publication Critical patent/JP2005313189A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for pouring molten metal in a vacuum molding for casting a thin cast product using a V-process mold, and to provide a product cast by the method. <P>SOLUTION: In the method for pouring molten metal into the V-process mold, a pouring gate is formed in the lower half mold of a completed mold and is not formed in the upper half mold. Further, the lower surface of the lower half mold of the completed mold to be arranged above a melting furnace is adjusted so as to be flat. In addition, a cushioning means for flattening the shape of the lower surface of the lower half mold of the completed mold is arranged between the completed mold and the melting furnace, and then the molten metal is poured into the mold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、鋳物を鋳造するため、特に薄肉鋳物を鋳造するための減圧鋳型造型の注湯方法及び鋳物に関する。ここで、減圧鋳型造型(以下、「Vプロセス」という)とは、原形模型板の表面に遮蔽部材を密着する遮蔽部材密着工程と、該密着した遮蔽部材上に造型枠体を載置すると共に該造型枠体内に粘結剤を含まない充填材を充填する工程と、該充填材の上面を密閉して造型枠体内を負圧にし、もって前記遮蔽部材を充填材側に吸着して遮蔽部材を成形する工程と、ついで前記原形模型板を遮蔽部材から離型して造型面を有する半割鋳型を造型する工程と、該半割鋳型と同様にして造型したもう一つの半割鋳型と型合せして鋳造キャビティを形成する工程と、該鋳造キャビティ内に溶融金属を注入する工程と、しかる後前記造型枠体内の負圧状態を解除して鋳物を取り出す工程と、を有する鋳型造型・注湯プロセスをいう。 The present invention relates to a casting method for casting a reduced pressure mold for casting a casting, and particularly for casting a thin casting, and the casting. Here, the reduced pressure mold making (hereinafter referred to as “V process”) is a shielding member adhesion step of closely attaching a shielding member to the surface of the original model board, and placing a molding frame on the closely attached shielding member. A step of filling the molding frame with a filler that does not contain a binder; and sealing the upper surface of the filler to create a negative pressure in the molding frame; Forming a half mold having a molding surface by releasing the original model plate from the shielding member, and another half mold and mold formed in the same manner as the half mold Forming a casting cavity together, injecting molten metal into the casting cavity, and then releasing the negative pressure state in the molding frame and taking out the casting, Refers to the hot water process.
従来、Vプロセスは広く用いられている(特許文献1参照)。しかしながら、その適用範囲としてはピアノフレームやカウンタウエイトなどの肉厚鋳物が多く、たとえば、肉厚3mm程度以下の薄肉を鋳造する鋳型としては用いられていなかった。 Conventionally, the V process has been widely used (see Patent Document 1). However, the range of application includes many thick castings such as piano frames and counterweights. For example, they have not been used as molds for casting thin walls with a thickness of about 3 mm or less.
特開昭54−118216号公報JP 54-118216 A
本発明は、上記の問題に鑑みて成されたもので、Vプロセス鋳型を用いて薄肉鋳物を鋳造する減圧鋳型造型の注湯方法とその方法により鋳造した鋳物を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of pouring a vacuum mold for casting a thin casting using a V process mold and a casting cast by the method.
上記の目的を達成するために本発明における減圧鋳型造型の注湯方法は、Vプロセスの注湯方法において、完成鋳型の下半割鋳型に湯口を形成し、上半割鋳型には湯口を形成しないことを特徴とする。
また、鋳造の炉の上に配される前記完成鋳型の下半割鋳型の下面を平面とすべく調整することを特徴とする。
さらに、前記完成鋳型と前記鋳造の炉との間に完成鋳型の下半割鋳型の下面の形状を平面にするための緩衝手段を設けて配置し注湯することを特徴とする。
In order to achieve the above object, the vacuum mold molding pouring method of the present invention is a V process pouring method in which a pouring gate is formed in the lower half mold of the finished mold and a pouring gate is formed in the upper half mold. It is characterized by not.
Further, the lower surface of the lower half mold of the finished mold disposed on the casting furnace is adjusted to be a flat surface.
Further, the present invention is characterized in that a buffering means is provided between the completed mold and the casting furnace so as to make the shape of the lower surface of the lower half mold of the completed mold flat and pouring.
また、上記の目的を達成するために本発明における減圧鋳型造型の注湯方法は、前記完成鋳型を鋳造の炉の上方に配置するのに際して、前記完成鋳型と前記鋳造の炉との間に断熱手段を設けて配置し注湯することを特徴とする。
さらに、前記断熱手段を構成する砂型が、下部を1本のストークと連通すると共に上部を複数本の湯口に連結することを特徴とする。
In order to achieve the above object, the pouring method of the reduced pressure mold making according to the present invention provides a heat insulation between the finished mold and the casting furnace when the finished mold is placed above the casting furnace. It is characterized by arranging and pouring hot water with means.
Further, the sand mold constituting the heat insulating means is characterized in that the lower part communicates with one stalk and the upper part is connected to a plurality of gates.
また、上記の目的を達成するために本発明における減圧鋳型造型の注湯方法は、前記注湯方法が低圧鋳造方法或いは差圧鋳造方法であることを特徴とする。
さらに、前記注湯方法において鋳造キャビティ内に注湯する際、注湯速度の制御を行うことを特徴とする。
In order to achieve the above object, the pouring method of the reduced pressure mold making according to the present invention is characterized in that the pouring method is a low pressure casting method or a differential pressure casting method.
Furthermore, when pouring into the casting cavity in the pouring method, the pouring speed is controlled.
本発明によれば、Vプロセスの注湯方法において、完成鋳型の下半割鋳型に湯口を形成し、上半割鋳型には湯口を形成しないことにより、下注ぎの鋳造が可能になり溶湯の流れが層流となり、重力鋳造方法やダイカストと比較して溶湯への空気やノロなどの巻き込みが少なくなる。また、揚がりや押湯を設ける必要がないため、捨て湯部は必要最小限とすることができる。これにより、製品歩留まりが向上するという利点がある。
さらに、本発明は、通常のVプロセス鋳型の特徴は保持しているため、解枠性に優れ、薄肉鋳物の取り出しが簡単になるという利点がある。
According to the present invention, in the pouring method of the V process, the pouring is formed in the lower half mold of the finished mold, and the pouring is not formed in the upper half mold, thereby enabling casting of the pouring. The flow becomes laminar, and entrainment of air, noro, etc. into the molten metal is reduced compared to the gravity casting method and die casting. Further, since there is no need to provide a fried food or a hot water, the discarded hot water portion can be minimized. This has the advantage that the product yield is improved.
Furthermore, since the present invention retains the characteristics of a normal V process mold, it has the advantage of being excellent in unframeability and facilitating the removal of a thin casting.
以下、本発明を実施するための最良の形態を説明する。本発明は、Vプロセスの造型工程を用いて造型された完成鋳型を鋳造の炉の上方に配置し注湯することを特徴とする。
即ち、Vプロセスの注湯方法において、下半割鋳型に湯口を形成し、上半割鋳型には湯口を形成しない完成鋳型を鋳造の炉の上方に配置し、完成鋳型と前記鋳造の炉との間に断熱手段を設けて注湯することを特徴とする。また、前記完成鋳型の下半割鋳型の下面を平面とすべく調整することを特徴とする。
ここで、上半割鋳型に湯口を形成しないとは、従来のVプロセスの注湯方法である重力鋳造方法ではなく、注湯方法として低圧鋳造方法或いは差圧鋳造方法を用いるため、完成鋳型の下面から注湯を行うためである。したがって、完成鋳型は鋳造の炉の上方に位置することになる。
また、断熱手段とは、鋳造の炉内にある溶湯の熱によりVプロセス鋳型の遮蔽部材であるフィルムが溶けてしまうのを防止するための手段で、下半割鋳型を載置する下ダイプレートと下半割鋳型の間に断熱材を設けることにより実施される。さらに、下ダイプレート内に部分的に挿入された形で設けることも可能である。なお、この断熱手段に用いる断熱材の材質は、陶器、セラミックス、石膏、砂型、自硬性砂型など溶湯の温度に耐えうる材質であればよい。
さらに、下半割鋳型の下面を平面とすべく調整するとは、下半割鋳型の下面が平面でない場合、下半割鋳型と断熱材や下ダイプレートとの間に隙間が生じ、注湯の際に湯漏れが発生する可能性があるため、下半割鋳型と断熱材や下ダイプレートとの間に下半割鋳型の下面の形状を平面にするための緩衝手段を設けたり、充填材を平らにするために機械的手段(振動やスクレーパー)を作用させることである。この緩衝手段の材質は、下半割鋳型の下面の形状になじむような軟質の材質であり、ガラスウール、砂など溶湯の温度に耐えうる材質であればよい。また、複合材料でもよい。
Hereinafter, the best mode for carrying out the present invention will be described. The present invention is characterized in that a finished mold formed by using a V-process molding step is placed above a casting furnace and poured.
That is, in the pouring method of the V process, a pouring gate is formed in the lower half mold, and a finished mold that does not form a pouring gate is arranged in the upper half mold above the casting furnace. A heat insulating means is provided between the two to pour hot water. The lower half of the lower half mold of the completed mold is adjusted to be a flat surface.
Here, the fact that the sprue is not formed in the upper half mold is not the gravity casting method which is the conventional V process pouring method, but the low pouring method or the differential pressure casting method as the pouring method. This is for pouring hot water from the lower surface. Therefore, the finished mold is located above the casting furnace.
The heat insulation means is a means for preventing the film as a shielding member of the V process mold from being melted by the heat of the molten metal in the casting furnace. The lower die plate on which the lower half mold is placed. It is carried out by providing a heat insulating material between the lower half mold and the lower half mold. Further, it may be provided in a form partially inserted into the lower die plate. The material of the heat insulating material used for this heat insulating means may be any material that can withstand the temperature of the molten metal, such as pottery, ceramics, gypsum, sand mold, self-hardening sand mold.
Furthermore, adjusting the lower surface of the lower half mold to be flat means that when the lower surface of the lower half mold is not flat, a gap is created between the lower half mold and the heat insulating material or the lower die plate. Since there is a possibility that hot water leaks, a buffer means is provided between the lower half mold and the heat insulating material or the lower die plate to make the lower surface of the lower half mold flat. The mechanical means (vibration or scraper) is applied to make the surface flat. The material of the buffer means may be a soft material that conforms to the shape of the lower surface of the lower half mold and may be a material that can withstand the temperature of the molten metal, such as glass wool or sand. A composite material may also be used.
以下、図面に基づき実施例を説明する。
図1は、実施例に用いた減圧鋳型造型装置の概略模式図である。図1に示すように、本減圧鋳型造型装置は、溶湯を保持した保持炉1と、保持炉1の上面に載置された下ダイプレート2と、下ダイプレート2の上面に載置された前記断熱手段である断熱材3と、断熱材3の上面に載置された鋳枠4,4と、鋳枠4,4内にVプロセスの造型工程を用いて造型された上下の半割鋳型5a,5bと、上半割鋳型5aの上面に載置された上ベース6と、前記保持炉1の上面の四隅から立設された4本のロッド7,7と、で構成している。
前記保持炉1には炉内に圧縮空気を導入するための圧縮空気導入管8が取り付けられている。また、前記上下の半割鋳型5a,5bの内部には型合せをすることにより鋳造キャビティ9が画成されている。
さらに、前記下ダイプレート2には保持炉1内の溶湯を鋳造キャビティ9内に導入するためのストーク10が取り付けられている。また、前記断熱材3には、下半割鋳型5b下面の湯口に対応し、ストーク10と連通した位置に溶湯の導入路となる孔が明けられている。
Embodiments will be described below with reference to the drawings.
FIG. 1 is a schematic diagram of a vacuum mold making apparatus used in the examples. As shown in FIG. 1, the reduced pressure mold making apparatus has a holding furnace 1 holding a molten metal, a lower die plate 2 placed on the upper surface of the holding furnace 1, and placed on the upper surface of the lower die plate 2. The heat insulating material 3 as the heat insulating means, the casting frames 4 and 4 placed on the upper surface of the heat insulating material 3, and the upper and lower half molds formed in the casting frames 4 and 4 using the molding process of the V process 5a, 5b, an upper base 6 placed on the upper surface of the upper half mold 5a, and four rods 7, 7 erected from the four corners of the upper surface of the holding furnace 1.
The holding furnace 1 is provided with a compressed air introduction pipe 8 for introducing compressed air into the furnace. A casting cavity 9 is defined in the upper and lower half molds 5a and 5b by matching the molds.
Further, a stalk 10 for introducing the molten metal in the holding furnace 1 into the casting cavity 9 is attached to the lower die plate 2. The heat insulating material 3 is provided with a hole serving as a molten metal introduction path at a position communicating with the stalk 10 corresponding to the pouring gate on the lower surface of the lower half mold 5b.
次に、実施例に用いた減圧鋳型造型装置の作用について説明する。図1において、上下の半割鋳型5a,5bの内部を、鋳枠4,4、吸引パイプ11,11を介して減圧装置12により減圧した。
該上下の半割鋳型5a,5bを断熱材3の上に載置し、上ベース6を上半割鋳型5aの上面に載置した。次に、上ベース6及び下ダイプレート2にて断熱材3と上下の半割鋳型5a,5bを挟み込みクランプした。その後、図示しない圧縮空気発生源から保持炉1内に圧縮空気導入管8を介して圧縮空気が導入され、溶湯の上面に圧力が加えられ、溶湯がストーク10を上昇しながら、鋳造キャビティ9内に充填を行った。鋳造キャビティ9内の溶湯が凝固した後、圧縮空気の導入が止められ、保持炉1内の圧力を大気圧に戻すに従い、湯口やストーク10内の余分な溶湯が保持炉1内に戻され注湯を終了した。
なお、本実施例の減圧鋳型造型装置は、鋳型の直下に保持炉が設置されているため、装置の設置スペースを最小限に押さえることができる。また、本実施例では、押湯、揚がりが使用されていないが、必要に応じ設けることができることはいうまでもない。
さらに、本実施例では、圧縮空気の導入により溶湯を供給しているが、電磁ポンプ等、他の方法により溶湯を供給してもよいことはいうまでもない。
Next, the operation of the reduced pressure mold making apparatus used in the examples will be described. In FIG. 1, the insides of the upper and lower half molds 5 a and 5 b were decompressed by the decompression device 12 through the casting frames 4 and 4 and the suction pipes 11 and 11.
The upper and lower half molds 5a and 5b were placed on the heat insulating material 3, and the upper base 6 was placed on the upper surface of the upper half mold 5a. Next, the upper base 6 and the lower die plate 2 sandwiched and clamped the heat insulating material 3 and the upper and lower half molds 5a and 5b. Thereafter, compressed air is introduced into the holding furnace 1 from the compressed air generating source (not shown) through the compressed air introduction pipe 8, pressure is applied to the upper surface of the molten metal, and the molten metal rises up the stalk 10, while in the casting cavity 9. The filling was performed. After the molten metal in the casting cavity 9 is solidified, the introduction of compressed air is stopped, and as the pressure in the holding furnace 1 is returned to atmospheric pressure, excess molten metal in the gate and stalk 10 is returned to the holding furnace 1. Finished the hot water.
In addition, since the holding furnace is installed directly under the mold in the reduced pressure mold making apparatus of the present embodiment, the installation space for the apparatus can be minimized. Further, in this embodiment, no hot water or fried food is used, but it goes without saying that it can be provided if necessary.
Furthermore, in the present embodiment, the molten metal is supplied by introducing compressed air, but it goes without saying that the molten metal may be supplied by other methods such as an electromagnetic pump.
次に、本実施例の減圧鋳型造型装置を用いて行った注湯テストについて説明する。
注湯テストは、前記鋳造キャビティ9へアルミニウム溶湯を注湯し、鋳造キャビティ9内に溶湯が充填された長さである全長と健全に充填された健全部の長さを測定した。
図2は、注湯テストにおける前記保持炉1内に加圧する圧縮空気の圧力条件を示したものである。最終到達設定圧力は0.03、0.06MPaであり、昇圧速度は0.01、0.02MPa/sである。
Next, a pouring test performed using the reduced pressure mold making apparatus of this example will be described.
In the pouring test, molten aluminum was poured into the casting cavity 9, and the length of the casting cavity 9 filled with the molten metal and the length of the soundly filled healthy portion were measured.
FIG. 2 shows the pressure conditions of the compressed air pressurized in the holding furnace 1 in the pouring test. The final set pressure is 0.03 and 0.06 MPa, and the pressure increase rate is 0.01 and 0.02 MPa / s.
図3は、鋳造キャビティ9の厚さが3mmの場合の鋳造キャビティ9内に溶湯が充填された長さである全長と健全に充填された健全部の長さの測定結果である。保持炉1内に加圧する圧縮空気の昇圧速度を0.01MPa/sとし、最終到達設定圧力を0.03MPaとした。比較例として、従来のVプロセスの造型工程を用いて造型された鋳型に重力鋳込みを行った重力鋳造の結果を合わせて示す。
図3より、本実施例の減圧鋳型造型装置を用いた場合の方が、全長及び健全部の長さとも比較例より長い数値を示した。
FIG. 3 shows the measurement results of the total length, which is the length that the molten metal is filled in the casting cavity 9 when the thickness of the casting cavity 9 is 3 mm, and the length of the healthy portion that is filled healthy. The pressurization speed of the compressed air pressurized into the holding furnace 1 was set to 0.01 MPa / s, and the final ultimate set pressure was set to 0.03 MPa. As a comparative example, the results of gravity casting in which gravity casting is performed on a mold molded using a conventional V process molding process are also shown.
From FIG. 3, the case where the reduced-pressure mold making apparatus of the present example was used showed a numerical value that was longer than the comparative example in both the overall length and the length of the healthy part.
図4は、鋳造キャビティ9の厚さが3mmの場合で、保持炉1内に加圧する圧縮空気の昇圧速度を変化させたときの鋳造キャビティ9内に溶湯が充填された長さである全長と健全に充填された健全部の長さの測定結果である。保持炉1内に加圧する圧縮空気の最終到達設定圧力を0.03MPaとし、昇圧速度を0.005、0.01、0.02MPa/sとした。
図4より、全長及び健全部の長さとも昇圧速度が高くなるほど長さが長くなる傾向であるが、昇圧速度が0.01MPa/s以上になると長さの変化は鈍くなることがわかる。本テストの結果では、昇圧速度を0.01MPa/sとするのが良いと考える。
FIG. 4 shows a case where the thickness of the casting cavity 9 is 3 mm, and the total length, which is the length of the molten metal filled in the casting cavity 9 when the pressurization speed of the compressed air pressurized in the holding furnace 1 is changed. It is the measurement result of the length of the healthy part with which it was filled up healthy. The final set pressure of the compressed air pressurized into the holding furnace 1 was set to 0.03 MPa, and the pressurizing speed was set to 0.005, 0.01, and 0.02 MPa / s.
From FIG. 4, it can be seen that both the total length and the length of the healthy part tend to increase as the pressure increase rate increases, but the length change becomes dull when the pressure increase rate is 0.01 MPa / s or more. In the result of this test, it is considered that the pressure increase rate should be 0.01 MPa / s.
次に、図5は、造型した鋳物の表面粗さの測定結果である。比較例として、従来のVプロセスの造型工程を用いて造型された鋳型に重力鋳込みを行った重力鋳造にて造型した鋳物の結果を合わせて示す。表面粗さを測定した場所は、図1において湯道から鋳造キャビティ9に溶湯が流れ込む部分である。
図5より、本実施例の減圧鋳型造型装置を用い、保持炉1内に加圧する圧縮空気の最終到達設定圧力を0.03MPaにした場合は、比較例である重力鋳造の場合と差がなかった。それに対し、保持炉1内に加圧する圧縮空気の最終到達設定圧力を0.06MPaにした場合は、表面粗さの数値が高くなり、表面粗さが荒くなった。これは、溶湯圧力が高くなったことにより鋳型に溶湯が差し込んでいるためと考えられる。
Next, FIG. 5 is a measurement result of the surface roughness of the molded casting. As a comparative example, the results of a casting formed by gravity casting in which gravity casting is performed on a mold formed by using a conventional V process molding process are also shown. The place where the surface roughness was measured is the part where the molten metal flows from the runner into the casting cavity 9 in FIG.
As shown in FIG. 5, when the final pressure setting of the compressed air to be pressurized in the holding furnace 1 is set to 0.03 MPa using the reduced pressure mold making apparatus of this example, there is no difference from the case of gravity casting as a comparative example. It was. On the other hand, when the final setting pressure of the compressed air pressurized in the holding furnace 1 was set to 0.06 MPa, the numerical value of the surface roughness became high and the surface roughness became rough. This is considered because the molten metal is inserted into the mold due to the increased molten metal pressure.
次に、図6は、本実施例における溶湯注湯時の圧力制御の例を示す。
図6に示すように、上下の半割鋳型5a,5bを型合わせすることにより鋳造キャビティ9が画成される。保持炉1内の溶湯の上面を加圧することにより溶湯はストーク10を上昇して、鋳造キャビティ9内に注湯される。なお、図6右のグラフにおいて、保持炉1内の溶湯上面に圧縮空気により加圧を開始する時点を0とする。
保持炉1内に加圧する圧縮空気の設定圧力Pと溶湯の到達高さhは、
式 P=ρbh
で決まる。
したがって、図6に示すように、溶湯が湯口から鋳造キャビティ9内に流れ込む位置h1に至るまでは、急激に溶湯高さが変化するため、保持炉1内に加圧する圧縮空気の設定圧力Pの昇圧速度を速くする必要がある。次に、鋳造キャビティ9の平面部分に注湯を行う部分であるh1からh2については、保持炉1内に加圧する圧縮空気の設定圧力Pの昇圧速度を遅くする必要がある。なぜなら、h1からh2の部分は鋳物製品となる部分であるため、溶湯の流れが乱流になることにより遮蔽部材であるフィルムの一部分に溶湯が集中して接触し、このためフィルムの部分的な焼け落ちによる型落ちが発生する危険がある。また、溶湯の流れが乱流になることによるガスの巻き込みも発生しやすくなる。などの不具合を防ぐためである。
また、h2からh3の部分は前記h1までの場合と同じように急激に溶湯高さが変化するため、保持炉1内に加圧する圧縮空気の設定圧力Pの昇圧速度を速くする必要がある。
Next, FIG. 6 shows an example of pressure control during molten metal pouring in the present embodiment.
As shown in FIG. 6, the casting cavity 9 is defined by matching the upper and lower half molds 5a and 5b. By pressurizing the upper surface of the molten metal in the holding furnace 1, the molten metal ascends the stalk 10 and is poured into the casting cavity 9. In the graph on the right side of FIG. 6, the time point when the pressurization with the compressed air is started on the upper surface of the molten metal in the holding furnace 1 is set to zero.
The set pressure P of the compressed air to be pressurized in the holding furnace 1 and the arrival height h of the molten metal are:
Formula P = ρbh
Determined by.
Therefore, as shown in FIG. 6, since the molten metal height rapidly changes until the molten metal reaches the position h <b> 1 where the molten metal flows into the casting cavity 9, the set pressure P of the compressed air pressurized in the holding furnace 1 is set. It is necessary to increase the boosting speed. Next, for h1 to h2, which is a portion for pouring hot water into the flat portion of the casting cavity 9, it is necessary to slow down the pressure increase rate of the set pressure P of the compressed air pressurized into the holding furnace 1. This is because the portions h1 to h2 are portions that become cast products, and the molten metal flows turbulently, so that the molten metal concentrates on and comes into contact with a part of the film that is a shielding member. There is a risk of mold loss due to burning off. In addition, entrainment of gas due to the turbulent flow of the molten metal is likely to occur. This is to prevent problems such as.
Further, since the height of the molten metal changes abruptly in the portion from h2 to h3 as in the case of h1 described above, it is necessary to increase the pressure increase rate of the set pressure P of the compressed air pressurized in the holding furnace 1.
次に、図7に基づき本発明を用いた別の実施例を説明する。
図7は、別の実施例に用いた減圧鋳型造型装置の概略模式図である。図6に示すように、本減圧鋳型造型装置は、溶湯を保持した保持炉21と、保持炉21の側方に立設された支柱22,22と、支柱22,22の上端間に架設された下ダイプレート23と、下ダイプレート23の上面に載置された鋳枠24,24と、鋳枠24,24内にVプロセスの造型工程を用いて造型された上下の半割鋳型25a,25bと、上半割鋳型25aの上面に載置された上ベース26と、前記下ダイプレート23の上面の四隅から立設された4本のロッド27,27と、下ダイプレート23の下面にある溶湯導入口28と前記保持炉21とを連通するパイプ29と、で構成している。
前記保持炉21には炉内に圧縮空気を導入するための圧縮空気導入管30が取り付けられている。また、前記上下の半割鋳型25a,25bの内部には型合せをすることにより鋳造キャビティ31が画成されている。
さらに、前記下ダイプレート23には保持炉21内の溶湯を鋳造キャビティ31内に導入するためのパイプ29に連通したストーク32が取り付けられている。また、下ダイプレート23の下面には、下半割鋳型25bの湯口に対応し、パイプ29と連通した位置に溶湯の導入路となる孔が明けられており、その孔の周囲には前記断熱手段である断熱材33が設けられている。
Next, another embodiment using the present invention will be described with reference to FIG.
FIG. 7 is a schematic diagram of a reduced pressure mold making apparatus used in another embodiment. As shown in FIG. 6, the reduced pressure mold making apparatus is constructed between a holding furnace 21 that holds molten metal, struts 22 and 22 erected on the side of the holding furnace 21, and upper ends of the struts 22 and 22. The lower die plate 23, the casting frames 24, 24 placed on the upper surface of the lower die plate 23, and the upper and lower half molds 25a formed in the casting frames 24, 24 using the molding process of the V process, 25b, an upper base 26 placed on the upper surface of the upper half mold 25a, four rods 27 and 27 erected from the four corners of the upper surface of the lower die plate 23, and a lower surface of the lower die plate 23 A molten metal inlet 28 and a pipe 29 communicating with the holding furnace 21 are configured.
The holding furnace 21 is provided with a compressed air introduction pipe 30 for introducing compressed air into the furnace. A casting cavity 31 is defined in the upper and lower half molds 25a and 25b by matching the molds.
Further, a stalk 32 communicating with a pipe 29 for introducing the molten metal in the holding furnace 21 into the casting cavity 31 is attached to the lower die plate 23. In addition, a hole serving as a molten metal introduction path is formed in a lower surface of the lower die plate 23 corresponding to the pouring gate of the lower half mold 25b and communicating with the pipe 29, and the heat insulation is formed around the hole. A heat insulating material 33 as means is provided.
次に、実施例に用いた減圧鋳型造型装置の作用について説明する。図7において、上下の半割鋳型25a,25bの内部を、鋳枠24,24、吸引パイプ34,34を介して減圧装置35により減圧した。
該上下の半割鋳型25a,25bを下ダイプレート23の上に載置し、上ベース26を上半割鋳型25aの上面に載置した。次に、上ベース26及び下ダイプレート23にて上下の半割鋳型25a,25bを挟み込みクランプした。その後、図示しない圧縮空気発生源から保持炉21内に圧縮空気導入管30を介して圧縮空気が導入され、溶湯の上面に圧力が加えられ、溶湯がストーク32及びパイプ29を上昇しながら、鋳造キャビティ31内に充填を行った。鋳造キャビティ31内の溶湯が凝固した後、圧縮空気の導入が止められ、保持炉21内の圧力を大気圧に戻すに従い、湯口やパイプ29及びストーク32内の余分な溶湯が保持炉21内に戻され注湯を終了した。
なお、本実施例の減圧鋳型造型装置は、保持炉上に鋳型がないため、溶湯の補給が容易であり、また、溶湯上面のノロや酸化物などの残滓が取り除きやすいなどの利点がある。
また、本実施例では、押湯、揚がりが使用されていないが、必要に応じ設けることができることはいうまでもない。
さらに、本実施例では、圧縮空気の導入により溶湯を供給しているが、電磁ポンプ等、他の方法により溶湯を供給してもよいことはいうまでもない。
Next, the operation of the reduced pressure mold making apparatus used in the examples will be described. In FIG. 7, the insides of the upper and lower half molds 25 a and 25 b were decompressed by the decompression device 35 through the casting frames 24 and 24 and the suction pipes 34 and 34.
The upper and lower half molds 25a and 25b were placed on the lower die plate 23, and the upper base 26 was placed on the upper surface of the upper half mold 25a. Next, the upper base 26 and the lower die plate 23 sandwiched and clamped the upper and lower half molds 25a and 25b. Thereafter, the compressed air is introduced into the holding furnace 21 from the compressed air generating source (not shown) through the compressed air introduction pipe 30, pressure is applied to the upper surface of the molten metal, and the molten metal rises up the stalk 32 and the pipe 29 while casting. The cavity 31 was filled. After the molten metal in the casting cavity 31 has solidified, the introduction of compressed air is stopped, and as the pressure in the holding furnace 21 is returned to atmospheric pressure, excess molten metal in the pouring gate, the pipe 29 and the stalk 32 enters the holding furnace 21. It was returned and pouring was finished.
Note that the reduced-pressure mold making apparatus of the present embodiment has an advantage that, since there is no mold on the holding furnace, the molten metal can be easily replenished, and residues such as sludge and oxide on the upper surface of the molten metal can be easily removed.
Further, in this embodiment, no hot water or fried food is used, but it goes without saying that it can be provided if necessary.
Furthermore, in the present embodiment, the molten metal is supplied by introducing compressed air, but it goes without saying that the molten metal may be supplied by other methods such as an electromagnetic pump.
図8に示すように、上下の半割鋳型41a,41bが載置された下ダイプレート42の下方まで1本のパイプ43により溶湯を供給し、下半割鋳型41bに面するパイプ43の一端に、複数の溶湯供給路を内部に形成した砂型44を取り付けた。この砂型44の使用により、鋳型に設けられた複数の湯口に同時に溶湯を供給することが可能となった。このため、複雑形状の鋳物への対応や、多数個込めの鋳物への対応も容易となった。なお、鋳造方案変更による湯口位置の変更に対しては、湯口位置に対応した溶湯供給路を形成した砂型44を造型すればよい。このように、砂型を使用することで湯口位置の変更への対応が容易にできる。また、本図では、砂型44はパイプ43に接続されているが、砂型44の接続先はストークでもよいことはいうまでもない。 As shown in FIG. 8, the molten metal is supplied to one lower portion of the lower die plate 42 on which the upper and lower half molds 41a and 41b are placed, and one end of the pipe 43 facing the lower half mold 41b. A sand mold 44 having a plurality of molten metal supply paths formed therein was attached. By using the sand mold 44, it becomes possible to supply molten metal simultaneously to a plurality of gates provided in the mold. For this reason, it became easy to deal with castings with complicated shapes and castings with many pieces. In addition, what is necessary is just to shape the sand mold | type 44 which formed the molten metal supply path corresponding to the gate position with respect to the change of the gate position by a casting plan change. Thus, the use of the sand mold can easily cope with the change of the gate position. In this figure, the sand mold 44 is connected to the pipe 43, but it goes without saying that the destination of the sand mold 44 may be stalk.
本発明は、大物薄肉鋳物、例えば大物家電、大型テレビ等のフレーム、自動車フレーム、機械装置フレームなどの鋳造品に好適である。なお、材質については問わない。   The present invention is suitable for castings such as large thin-walled castings, for example, frames for large household appliances, large-sized televisions, automobile frames, machinery frames, and the like. The material is not questioned.
本発明の実施例の断面概略図を示す。1 shows a schematic cross-section of an embodiment of the present invention. 本発明の実施例における注湯テストの圧力条件を示す。The pressure conditions of the pouring test in the Example of this invention are shown. 本発明の実施例における注湯テストの流動長の結果を示す。The result of the flow length of the pouring test in the Example of this invention is shown. 本発明の実施例における注湯テストの流動長の別の結果を示す。The another result of the flow length of the pouring test in the Example of this invention is shown. 本発明の実施例における注湯テストの表面粗さの結果を示す。The result of the surface roughness of the pouring test in the Example of this invention is shown. 本発明の実施例における注湯テストの圧力制御の例を示す。The example of the pressure control of the pouring test in the Example of this invention is shown. 本発明の別の実施例の断面概略図を示す。FIG. 3 shows a schematic cross-sectional view of another embodiment of the present invention. 本発明の実施例における注湯治具を示す。The pouring jig in the Example of this invention is shown.
符号の説明Explanation of symbols
1 保持炉
2 下ダイプレート
3 断熱材
4 鋳枠
5a 上半割鋳型
5b 下半割鋳型
9 鋳造キャビティ
10 ストーク
21 保持炉
23 下ダイプレート
24 鋳枠
25a 上半割鋳型
25b 下半割鋳型
31 鋳造キャビティ
32 ストーク
33 断熱材
41a 上半割鋳型
41b 下半割鋳型
42 下ダイプレート
44 砂型
DESCRIPTION OF SYMBOLS 1 Holding furnace 2 Lower die plate 3 Heat insulating material 4 Cast frame 5a Upper half mold 5b Lower half mold 9 Cast cavity 10 Stoke 21 Holding furnace 23 Lower die plate 24 Cast frame 25a Upper half mold 25b Lower half mold 31 Casting Cavity 32 Stoke 33 Heat insulating material 41a Upper half mold 41b Lower half mold 42 Lower die plate 44 Sand mold

Claims (13)

  1. 原形模型板の表面に遮蔽部材を密着する遮蔽部材密着工程と、
    該密着した遮蔽部材上に造型枠体を載置すると共に該造型枠体内に粘結剤を含まない充填材を充填する工程と、
    該充填材の上面を密閉して造型枠体内を負圧にし、もって前記遮蔽部材を充填材側に吸着して遮蔽部材を成形する工程と、
    ついで前記原形模型板を遮蔽部材から離型して造型面を有する半割鋳型を造型する工程と、
    該半割鋳型と同様にして造型したもう一つの半割鋳型と型合せして鋳造キャビティを画成すると共に完成鋳型を形成する工程と、
    該鋳造キャビティ内に溶融金属を注入する工程と、
    しかる後前記造型枠体内の負圧状態を解除して鋳物を取り出す工程と、を有する減圧鋳型造型の注湯方法において、
    前記完成鋳型の下半割鋳型に湯口を形成し、上半割鋳型には湯口を形成しないことを特徴とする減圧鋳型造型の注湯方法。
    A shielding member adhesion step for closely attaching the shielding member to the surface of the original model board;
    Placing the molding frame on the closely shielded member and filling the molding frame with a filler not containing a binder;
    Sealing the upper surface of the filler so as to create a negative pressure in the molding frame, and adsorbing the shielding member to the filler side to form the shielding member;
    Next, a step of forming the half mold having a molding surface by releasing the original model plate from the shielding member;
    Forming a casting cavity by molding with another half mold formed in the same manner as the half mold, and forming a finished mold;
    Injecting molten metal into the casting cavity;
    Thereafter, the step of releasing the negative pressure state in the molding frame body and taking out the casting,
    A pouring method for forming a vacuum mold, wherein a pouring gate is formed in the lower half mold of the finished mold and no pouring gate is formed in the upper half mold.
  2. 鋳造の炉の上に配される前記完成鋳型の下半割鋳型の下面を平面とすべく調整することを特徴とする請求項1に記載の減圧鋳型造型の注湯方法。 2. The method of pouring a vacuum mold according to claim 1, wherein the bottom surface of the lower half mold of the finished mold disposed on the casting furnace is adjusted to be a flat surface.
  3. 前記完成鋳型と前記鋳造の炉との間に完成鋳型の下半割鋳型の下面の形状を平面にするための緩衝手段を設けて配置し注湯することを特徴とする請求項1に記載の減圧鋳型造型の注湯方法。 2. The pouring is performed by disposing a pouring means provided between the finished mold and the casting furnace so as to flatten the shape of the lower surface of the lower half mold of the finished mold. A method of pouring a vacuum mold.
  4. 前記完成鋳型を鋳造の炉の上方に配置するのに際して、前記完成鋳型と前記鋳造の炉との間に断熱手段を設けて配置し注湯することを特徴とする請求項1から請求項3のいずれか1項に記載の減圧鋳型造型の注湯方法。 4. The pouring of the finished mold by placing a heat insulating means between the finished mold and the casting furnace when pouring the finished mold above the casting furnace. A method for pouring a vacuum mold according to any one of the preceding claims.
  5. 前記断熱手段が、下ダイプレートを含むことを特徴とする請求項4に記載の減圧鋳型造型の注湯方法。 5. The method for pouring a vacuum mold according to claim 4, wherein the heat insulating means includes a lower die plate.
  6. 前記断熱手段が、下ダイプレートに設けた冷却手段をも兼ねていることを特徴とする請求項4に記載の減圧鋳型造型の注湯方法。 5. The method for pouring a vacuum mold according to claim 4, wherein the heat insulating means also serves as a cooling means provided on the lower die plate.
  7. 前記断熱手段が、下ダイプレートと、砂型と、を含むことを特徴とする請求項4に記載の減圧鋳型造型の注湯方法。 5. The method of pouring a vacuum mold according to claim 4, wherein the heat insulating means includes a lower die plate and a sand mold.
  8. 前記断熱手段が、下ダイプレートと、自硬性砂型と、を含むことを特徴とする請求項4に記載の減圧鋳型造型の注湯方法。 The method for pouring a vacuum mold according to claim 4, wherein the heat insulating means includes a lower die plate and a self-hardening sand mold.
  9. 前記断熱手段を構成する砂型が、下部を1本のストークと連通すると共に上部を複数本の湯口に連結することを特徴とする請求項4に記載の減圧鋳型造型の注湯方法。 The method for pouring a vacuum mold according to claim 4, wherein the sand mold constituting the heat insulating means communicates the lower part with one stalk and connects the upper part to a plurality of gates.
  10. 前記注湯方法が低圧鋳造方法であることを特徴とする請求項1から請求項9のいずれか1項に記載の減圧鋳型造型の注湯方法。 The method of pouring a vacuum mold according to any one of claims 1 to 9, wherein the pouring method is a low pressure casting method.
  11. 前記注湯方法が差圧鋳造方法であることを特徴とする請求項1から請求項9のいずれか1項に記載の減圧鋳型造型の注湯方法。 The method of pouring a vacuum mold according to any one of claims 1 to 9, wherein the pouring method is a differential pressure casting method.
  12. 前記注湯方法において鋳造キャビティ内に注湯する際、注湯速度の制御を行うことを特徴とする請求項4から請求項9のいずれか1項に記載の減圧鋳型造型の注湯方法。 The method for pouring a vacuum mold according to any one of claims 4 to 9, wherein the pouring speed is controlled when pouring the casting cavity in the pouring method.
  13. 請求項1から請求項12のいずれか1項に記載の減圧鋳型造型の注湯方法により鋳造した鋳物。
    A casting that is cast by the method of pouring a reduced-pressure mold according to any one of claims 1 to 12.
JP2004132681A 2004-04-28 2004-04-28 Method for pouring molten metal in vacuum molding, and cast product Pending JP2005313189A (en)

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JP2004132681A JP2005313189A (en) 2004-04-28 2004-04-28 Method for pouring molten metal in vacuum molding, and cast product
PCT/JP2005/006481 WO2005095022A1 (en) 2004-04-01 2005-04-01 Method and device for pouring molten metal in vacuum molding and casting
EP05727259A EP1731242A4 (en) 2004-04-01 2005-04-01 Method and device for pouring molten metal in vacuum molding and casting
BRPI0509560 BRPI0509560A (en) 2004-04-01 2005-04-01 casting method, device and molten product in a vacuum molding process
KR20067022592A KR100901034B1 (en) 2004-04-01 2005-04-01 Method and device for pouring molten metal in vacuum molding and casting
US11/547,541 US7500507B2 (en) 2004-04-01 2005-04-01 Method and device for pouring molten metal in vacuum molding and casting
CN2005800177655A CN1960822B (en) 2004-04-01 2005-04-01 Method and device for pouring molten metal in vacuum molding and casting
EA200601602A EA008468B1 (en) 2004-04-01 2005-04-01 Method and device for pouring molten metal in vacuum molding and casting
US12/318,098 US7757746B2 (en) 2004-04-01 2008-12-22 Pouring method, device, and cast in vacuum molding process

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JP2009255138A (en) * 2008-04-17 2009-11-05 Tajima Keikinzoku:Kk Low-pressure casting apparatus and method

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JPS61502245A (en) * 1984-06-02 1986-10-09
JPS6310056A (en) * 1986-06-30 1988-01-16 Toyo Tire & Rubber Co Ltd Mold for low pressure casting of metal die for vulcanizing tyre forming
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JPH0565461U (en) * 1992-02-14 1993-08-31 新東工業株式会社 Turntable suction casting equipment
JPH08141731A (en) * 1994-11-17 1996-06-04 Toyota Motor Corp Casting method and casting device
JPH1157978A (en) * 1997-08-21 1999-03-02 Asahi Tec Corp Differential pressure casting apparatus
JP2002035918A (en) * 2000-07-17 2002-02-05 Sintokogio Ltd Method for holding vacuum mold and suction pipeline apparatus

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