JP2006150370A - Holding furnace for low pressure casting - Google Patents

Holding furnace for low pressure casting Download PDF

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JP2006150370A
JP2006150370A JP2004340866A JP2004340866A JP2006150370A JP 2006150370 A JP2006150370 A JP 2006150370A JP 2004340866 A JP2004340866 A JP 2004340866A JP 2004340866 A JP2004340866 A JP 2004340866A JP 2006150370 A JP2006150370 A JP 2006150370A
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molten metal
pressurizing
chamber
pressure casting
holding furnace
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JP4615300B2 (en
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Shunji Mochizuki
俊二 望月
Koichi Murakami
浩一 村上
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TOUNETSU Co Ltd
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TOUNETSU Co Ltd
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Priority to EP05806331A priority patent/EP1820585B1/en
Priority to CN2005800405365A priority patent/CN101094740B/en
Priority to PCT/JP2005/020844 priority patent/WO2006057179A1/en
Priority to US11/791,534 priority patent/US7790098B2/en
Priority to AT05806331T priority patent/ATE525155T1/en
Priority to CA002588863A priority patent/CA2588863A1/en
Priority to KR1020077014250A priority patent/KR101132930B1/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a holding furnace for low pressure casting in which crack and breakage on an inner wall surface of a pressurizing part and/or an molten metal tapping part and damage to the inner surface at work for removing material stuck to the inner wall surface are prevented, and consequently good accuracy of pressure control to the molten metal is maintained and the contamination of the molten metal into a metallic mold can be prevented. <P>SOLUTION: The holding furnace 1 for low pressure casting is provided with: a shut-off valve 37 for opening/closing a molten metal flowing passage hole 24 positioned between a molten metal holding chamber 11 and a pressurizing chamber 12; the pressurizing part 32 and the molten metal tapping part 33 each communicated with the pressurizing part 12 at bottom parts; and tube heaters 22, 36 disposed in the molten metal holding chamber 11 and the pressurizing chamber 12, respectively, wherein the inner wall surfaces of the pressurizing part 32 and/or the molten metal tapping part 33 are formed of wall lining members 34, 35 each composed of a cylindrical fine ceramic-made integral fired matter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、例えばアルミニウム、アルミニウム合金鋳物の製造に好適な低圧鋳造用保持炉に関するものである。   The present invention relates to a holding furnace for low pressure casting suitable for manufacturing, for example, aluminum and aluminum alloy castings.

従来、種々の低圧鋳造用保持炉が公知である（例えば、特許文献１，２参照。）。
特開平１１−１３８２５０号公報 特許第３３９２５４４号公報 Conventionally, various low pressure casting holding furnaces are known (see, for example, Patent Documents 1 and 2).
JP-A-11-138250 Japanese Patent No. 3392544

特許文献１には、溶湯保持室と加圧室との間に位置する溶湯流路口を開閉する遮断弁を備え、前記加圧室が溶湯の上面に圧縮気体により圧力を作用させる加圧部と加圧された溶湯を金型のキャビティに流し込む出湯部とに区画された低圧鋳造用保持炉が開示されている。この低圧鋳造用保持炉は、外側から内側に向かって、鉄皮、耐火層、断熱層、さらに溶湯収納容器からなる多層の内張り構造を有し、前記溶湯収納容器はアルミナ系の不定形耐火物として一体型バスに形成されたものである。   Patent Document 1 includes a shut-off valve that opens and closes a melt channel opening located between a molten metal holding chamber and a pressurizing chamber, and the pressurizing chamber applies pressure to the upper surface of the melt with compressed gas; There is disclosed a low pressure casting holding furnace that is divided into a hot water supply section for flowing a pressurized molten metal into a cavity of a mold. This holding furnace for low-pressure casting has a multi-layered lining structure composed of an iron shell, a refractory layer, a heat insulating layer, and a molten metal storage container from the outside to the inside, and the molten metal storage container is an alumina-based amorphous refractory. Are formed in an integrated bus.

特許文献２には、溶湯流路口の溶湯保持室側における開口周縁部に形成された弁座設置部に前述した溶湯収納容器とは別部材として形成された弁座をその上面が前記溶湯収納容器の内周面と面一となるように設け、この弁座に遮断弁の先端を接離させることにより前記溶湯流路口を開閉するようにした低圧鋳造用保持炉が開示されている。   In Patent Document 2, a valve seat formed as a separate member from the above-described molten metal storage container is provided at a valve seat installation portion formed at the opening peripheral edge portion on the molten metal holding chamber side of the molten metal flow path opening, the upper surface of which is the molten metal storage container. There is disclosed a low pressure casting holding furnace which is provided so as to be flush with the inner peripheral surface, and the molten metal flow passage opening is opened and closed by bringing the tip of a shutoff valve into contact with and separating from the valve seat.

特許文献１に記載の低圧鋳造用保持炉の場合、溶湯と直接接触する前記溶湯収納容器の一体型バスを形成する不定形耐火物が通気性を有するため、鋳造工程の繰り返しにおいて、前記不定形耐火物内への溶湯の浸透は避けられず、この浸透により前記不定形耐火物に亀裂や破損が生じる。特に、この亀裂や破損が加圧部や出湯部に発生すると、鋳造作業に支障を来すという問題がある。具体的には、加圧部における亀裂や破損の発生の結果、鋳造作業に直接影響する圧力制御が不安定になり、安定した連続操業が不可能になり、最悪の場合、操業停止に追い込まれる。また、この亀裂や破損により、加圧用気体の外部への漏出を招くことになり、この結果、圧力制御の精度も低下する。一方、出湯部で亀裂や破損が発生すると、加圧部での制御圧力を維持した状態で溶湯が金型内のキャビティに充填されず、鋳造物は不良品となる。さらに、加圧部及び出湯部の内壁面には、溶湯が固着してゆくため、定期的にこの内壁面への固着物の除去が必要となるが、前記不定形耐火物は脆く、この固着物の除去作業時に前記不定形耐火物の表面を損傷させ易いという問題がある。   In the case of the holding furnace for low-pressure casting described in Patent Document 1, since the amorphous refractory forming an integrated bath of the molten metal storage container that is in direct contact with the molten metal has air permeability, The penetration of the molten metal into the refractory is inevitable, and this penetration causes cracks and breakage of the irregular refractory. In particular, when this crack or breakage occurs in the pressurizing part or the hot water outlet part, there is a problem that the casting operation is hindered. Specifically, as a result of the occurrence of cracks and breakage in the pressurization section, pressure control that directly affects the casting operation becomes unstable, making stable continuous operation impossible, and in the worst case, the operation is stopped. . Further, this crack or breakage causes leakage of the pressurizing gas to the outside, and as a result, the accuracy of pressure control also decreases. On the other hand, when a crack or breakage occurs in the hot water discharge portion, the molten metal is not filled in the cavity in the mold while maintaining the control pressure in the pressurizing portion, and the casting becomes a defective product. Further, since the molten metal adheres to the inner wall surfaces of the pressurizing part and the hot water outlet part, it is necessary to periodically remove the adhering substance on the inner wall surface. There is a problem that the surface of the irregular refractory is easily damaged during the removal of the kimono.

特許文献２に記載の低圧鋳造用保持炉の場合、前述した問題に加え、前記弁座の上面と前記溶湯収納容器の内周面とが面一になっているため、溶湯保持室内で生じた不純物、特に、溶湯流路口の周辺における沈殿物が加圧室内に流入し、この結果、溶湯を汚染するという問題がある。   In the case of the holding furnace for low-pressure casting described in Patent Document 2, in addition to the above-described problems, the upper surface of the valve seat and the inner peripheral surface of the molten metal storage container are flush with each other, and thus occurred in the molten metal holding chamber. There is a problem that impurities, in particular, precipitates around the melt channel opening flow into the pressurizing chamber, resulting in contamination of the melt.

本発明は、斯かる従来の問題をなくすことを課題としてなされたもので、加圧部及び／または出湯部の内壁面の亀裂及び破損、並びに、前記内壁面への固着物の除去作業時における前記内壁面の損傷を防止し、溶湯に対する圧力制御の良好な精度を維持し、金型への溶湯の汚染防止を可能とした低圧鋳造用保持炉を提供しようとするものである。   The present invention has been made in order to eliminate such a conventional problem. At the time of removing cracks and breakage of the inner wall surface of the pressurizing part and / or the tapping part, and the fixed object on the inner wall surface An object of the present invention is to provide a holding furnace for low-pressure casting that prevents damage to the inner wall surface, maintains good accuracy of pressure control on the molten metal, and prevents contamination of the molten metal to the mold.

上記課題を解決するために、第１発明は、溶湯保持室と加圧室との間に位置する溶湯流路口を開閉する遮断弁を備えるとともに、前記加圧室が互いに底部で連通する加圧部と出湯部とを備え、かつ、前記溶湯保持室内及び前記加圧室内にチューブヒータを配置した低圧鋳造用保持炉において、前記加圧部及び／または出湯部の内壁面が、円筒状のファインセラミックス製一体焼成物からなる内張部材で形成された構成とした。   In order to solve the above-mentioned problem, the first invention includes a shutoff valve that opens and closes a melt channel opening located between the melt holding chamber and the pressurizing chamber, and the pressurizing chamber communicates with each other at the bottom. In the holding furnace for low pressure casting that includes a heating part and a tapping part, and a tube heater is arranged in the molten metal holding chamber and the pressurizing chamber, the inner wall surface of the pressurizing part and / or the tapping part has a cylindrical fine shape. It was set as the structure formed with the lining member which consists of ceramics baking products.

第２発明は、第１発明の構成に加えて、前記ファインセラミックス製一体焼成物が、窒化珪素からなる構成とした。   In the second aspect of the invention, in addition to the structure of the first aspect, the fine ceramics integrally fired product is made of silicon nitride.

第３発明は、第１または第２発明の構成に加えて、前記溶湯流路口を構成する弁座が、その下部を溶湯流路口の弁座設置部に固定され、上端部を周囲の溶湯保持室底面よりも高く位置させるよう設けられた構成とした。   According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, a valve seat constituting the molten metal flow path port is fixed at a lower portion thereof to a valve seat installation portion of the molten metal flow path port, and an upper end portion is held around the molten metal. It was set as the structure provided so that it might be located higher than a chamber bottom face.

本発明に係る低圧鋳造用保持炉によれば、加圧部及び／または出湯部の内壁面の亀裂及び破損、並びに、前記内壁面への固着物の除去作業時における前記内壁面の損傷を防止し、溶湯に対する圧力制御の良好な精度を維持すること等が可能になるという効果を奏する。   According to the holding furnace for low-pressure casting according to the present invention, cracks and breakage of the inner wall surface of the pressurizing part and / or the tapping part, and damage to the inner wall surface during the removal work of the fixed matter on the inner wall surface are prevented. In addition, there is an effect that it is possible to maintain good accuracy of pressure control for the molten metal.

また、内壁面を窒化珪素からなる内張部材で形成することにより、加圧部及び／または出湯部の内壁面の耐久性をより一層向上させることが可能になるという効果を奏する。   Further, by forming the inner wall surface with a lining member made of silicon nitride, there is an effect that it is possible to further improve the durability of the inner wall surface of the pressurizing portion and / or the tapping portion.

さらに、弁座をその上端面が周囲の溶湯保持室の底面よりも高位置とすることにより、溶湯保持室内における沈殿物の加圧室内への流入が抑制され、加圧室における溶湯の汚染を最小限に止めることが可能になるという効果を奏する。   Furthermore, the upper end surface of the valve seat is positioned higher than the bottom surface of the surrounding molten metal holding chamber, so that the inflow of sediment into the pressurized chamber in the molten metal holding chamber is suppressed and contamination of the molten metal in the pressurized chamber is prevented. There is an effect that it can be minimized.

次に、本発明の実施形態を図面にしたがって説明する。
図１〜４は、本発明に係る低圧鋳造用保持炉１を示し、この低圧鋳造用保持炉１は、並列配置され、底部が互いに連通した溶湯保持室１１と加圧室１２とを備えている。 Next, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a holding furnace 1 for low-pressure casting according to the present invention. The holding furnace 1 for low-pressure casting includes a molten metal holding chamber 11 and a pressurizing chamber 12 which are arranged in parallel and whose bottom portions communicate with each other. Yes.

溶湯保持室１１は、上部に保持室蓋２１を備えるとともに、耐火物からなる内壁の側面部にチューブヒータ２２及び温度センサ２３を備え、図示しない金属溶解炉から供給され、内部に貯えた溶湯を一定温度範囲内に保持可能に形成されている。また、溶湯保持室１１の底部には加圧室１２に通じる溶湯流路口２４が形成され、その上端の内周部に形成された弁座設置部２５には、上端面が周囲の溶湯保持室底面よりも高位置となるように設けられた円筒状ファインセラミックス製、例えば窒化珪素製の一体焼成物である弁座２６が固定されている。そして、この弁座２６の上方には保持室蓋２１を気密に、かつ昇降可能に貫いて、溶湯流路口２４を開閉する遮断弁２７が設けられている。即ち、遮断弁２７は、下降時に弁座２６に密着して溶湯流路口２４を閉じ、上昇時に弁座２６から離れて溶湯流路口２４を開く。   The molten metal holding chamber 11 includes a holding chamber lid 21 at the top, a tube heater 22 and a temperature sensor 23 on the side surface of the inner wall made of a refractory, and is supplied from a metal melting furnace (not shown) and stores the molten metal stored inside. It is formed so that it can be maintained within a certain temperature range. In addition, a molten metal flow passage port 24 leading to the pressurizing chamber 12 is formed at the bottom of the molten metal holding chamber 11, and the valve seat installation portion 25 formed at the inner peripheral portion of the upper end of the molten metal holding chamber 11 has an upper end surface surrounding the molten metal holding chamber. A valve seat 26, which is an integrally fired product made of cylindrical fine ceramics, for example, silicon nitride, is provided so as to be positioned higher than the bottom surface. A shut-off valve 27 is provided above the valve seat 26 so as to penetrate the holding chamber lid 21 in an airtight manner so as to be movable up and down, and to open and close the molten metal flow passage opening 24. That is, the shut-off valve 27 is in close contact with the valve seat 26 when lowered and closes the molten metal flow path port 24, and is separated from the valve seat 26 when opened to open the molten metal flow path port 24.

加圧室１２は、溶湯流路口２４に通じる下部流通路３１を介して互いに底部で連通する加圧部３２と出湯部３３とを備え、下部流通路３１の内壁面は耐火物で形成され、加圧部３２と出湯部３３の内壁面は、耐火物からなる壁面を覆うように設けられた円筒状のファインセラミックス製一体焼成物、例えば窒化珪素からなる内張部材３４，３５で形成されている。また、下部流通路３１には、チューブヒータ３６が設けられ、加圧部３２の上部密閉蓋３７に加圧用気体供給口３８が設けられるとともに、この上部密閉蓋３７からレベルセンサ３９が吊持されている。そして、加圧部３２内の溶湯面レベルが一定範囲内に維持されるとともに、溶湯の上部空間が加圧されるようになっている。さらに、出湯部３３の上部に固定される下部ダイベース４１上には、金型４２が固定され、出湯部３３と金型４２のキャビティ４３とは下部ダイベース４１の通湯孔４４を介して連通している。   The pressurizing chamber 12 includes a pressurizing portion 32 and a hot water discharge portion 33 that communicate with each other at the bottom via a lower flow passage 31 that communicates with the molten metal flow passage port 24, and an inner wall surface of the lower flow passage 31 is formed of a refractory material. The inner wall surfaces of the pressurizing unit 32 and the hot water outlet unit 33 are formed by cylindrical fine ceramics integrally fired products provided to cover the wall surface made of refractory, for example, lining members 34 and 35 made of silicon nitride. Yes. A tube heater 36 is provided in the lower flow passage 31, a pressurization gas supply port 38 is provided in the upper sealing lid 37 of the pressurizing unit 32, and a level sensor 39 is suspended from the upper sealing lid 37. ing. And while the molten metal surface level in the pressurization part 32 is maintained in a fixed range, the upper space of a molten metal is pressurized. Furthermore, a mold 42 is fixed on the lower die base 41 fixed to the upper part of the hot water outlet 33, and the hot water outlet 33 and the cavity 43 of the metal mold 42 communicate with each other through the hot water holes 44 of the lower die base 41. ing.

なお、図１において、二点鎖線Ｕは湯面上限レベルを示し、二点鎖線Ｌは湯面下限レベルを示している。   In FIG. 1, a two-dot chain line U indicates a hot water surface upper limit level, and a two-dot chain line L indicates a hot water surface lower limit level.

上記構成からなる低圧鋳造用保持炉１において、溶湯流路口２４が開かれた状態で、溶湯保持室１１から加圧室１２に溶湯が供給され、湯面が前述した二点鎖線Ｕ及びＬ間に保たれるとともに、チューブヒータ２２及び３６により溶湯は一定温度範囲内に保たれる。そして、遮断弁２７により溶湯流路口２４が閉じられ、加圧用気体供給口３８より送り込まれる加圧用気体、例えばＮ２，Ａｒ等の不活性ガスにより加圧部３２が加圧され、加圧部３２内の湯面低下とともに、出湯部３３から通湯孔４４を介して金型４２のキャビティ４３内に溶湯が圧入され、鋳造が行われる。 In the low pressure casting holding furnace 1 having the above-described configuration, the molten metal is supplied from the molten metal holding chamber 11 to the pressurizing chamber 12 with the molten metal flow path opening 24 opened, and the molten metal surface is between the two-dot chain lines U and L described above. The molten metal is kept within a certain temperature range by the tube heaters 22 and 36. Then, the molten metal flow path port 24 is closed by the shutoff valve 27, and the pressurizing part 32 is pressurized by an inert gas such as N 2 , Ar, or the like, supplied from the pressurizing gas supply port 38, and the pressurizing part As the hot water level in 32 is lowered, the molten metal is pressed into the cavity 43 of the mold 42 from the hot water outlet 33 through the hot water hole 44, and casting is performed.

前述したように、加圧部３２及び出湯部３３は、内壁面が、耐火物からなる壁面を覆うように設けられた円筒状のファインセラミックス製一体焼成物、例えば窒化珪素からなる内張部材３４，３５で形成されているため、溶湯の浸透による内壁面の亀裂や破損が防止され、内壁面に固着した不純物の除去作業時における内壁面の損傷が低減でき、内壁面の耐久性の向上が可能となっている。また、加圧部３２において、加圧用気体の漏出が防止され、加圧用気体による圧力制御の精度を向上させることができるとともに、出湯部３３において、内壁面への溶湯の浸透、及び、内壁面の亀裂及び破損の回避により所望量の溶湯を確実にキャビティ４３内に充填可能となり、良好な鋳物製品の製造が可能となっている。さらに、内張部材３４，３５を円筒状のファインセラミックス製のなかでも、特に高温強度、高温耐摩耗性及び耐熱衝撃性に優れた窒化珪素製の一体焼成物とすることにより、加圧部３２及び出湯部３３の内壁面の耐久性を、より一層向上させることが可能となっている。その他、溶湯流路口２４の弁座設置部２５に、窒化珪素製の一体焼成物である弁座２６を設けることにより前記同様に、その耐久性を向上させ得るとともに、弁座２６が、その上端面を周囲の溶湯保持室１１の底面よりも高位置とするように設けられることにより、溶湯保持室１１内における沈殿物の加圧室１２内への流入が抑制され、加圧室１２における溶湯の汚染を最小限に止めることが可能となっている。   As described above, the pressurizing section 32 and the hot water outlet section 33 are formed of a cylindrical fine ceramic monolithic fired product, for example, a lining member 34 made of silicon nitride, so that the inner wall surface covers the wall surface made of refractory. , 35 prevents cracking and breakage of the inner wall surface due to penetration of the molten metal, reduces damage to the inner wall surface during removal of impurities adhered to the inner wall surface, and improves the durability of the inner wall surface. It is possible. Further, in the pressurizing unit 32, leakage of the pressurizing gas can be prevented, and the accuracy of pressure control by the pressurizing gas can be improved. In the hot water discharge unit 33, the penetration of the molten metal into the inner wall surface and the inner wall surface can be achieved. By avoiding cracks and breakage, it is possible to reliably fill the cavity 43 with a desired amount of molten metal, and it is possible to manufacture a good casting product. Furthermore, the lining members 34 and 35 are made of an integrally fired product made of silicon nitride having excellent high-temperature strength, high-temperature wear resistance and thermal shock resistance among the cylindrical fine ceramics. In addition, the durability of the inner wall surface of the hot water outlet 33 can be further improved. In addition, by providing the valve seat 26, which is an integrally fired product made of silicon nitride, in the valve seat installation portion 25 of the molten metal flow passage port 24, the durability can be improved in the same manner as described above, and the valve seat 26 can be By providing the end surface so as to be higher than the bottom surface of the surrounding molten metal holding chamber 11, the flow of precipitates into the pressurized chamber 12 in the molten metal holding chamber 11 is suppressed, and the molten metal in the pressurized chamber 12 is suppressed. It is possible to minimize contamination.

本発明に係る低圧鋳造用保持炉１は、例えばアルミニウム、アルミニウム合金鋳物の製造に好適である。   The holding furnace 1 for low pressure casting according to the present invention is suitable for manufacturing, for example, aluminum and aluminum alloy castings.

本発明に係る低圧鋳造用保持炉の断面図である。It is sectional drawing of the low pressure casting holding furnace which concerns on this invention. 図１の円I内の部分拡大図である。It is the elements on larger scale in the circle I of FIG. 図１の円II内の部分拡大図である。It is the elements on larger scale in the circle | round | yen II of FIG. 図１の円III内の部分拡大図である。It is the elements on larger scale in the circle | round | yen III of FIG.

符号の説明Explanation of symbols

１ 低圧鋳造用保持炉
１１ 溶湯保持室
１２ 加圧室
２１ 保持室蓋
２２ チューブヒータ
２３ 温度センサ
２４ 溶湯流路口
２５ 弁座設置部
２６ 弁座
２７ 遮断弁
３１ 下部流通路
３２ 加圧部
３３ 出湯部
３４，３５ 内張部材
３６ チューブヒータ
３７ 上部密閉蓋
３８ 加圧用気体供給口
３９ レベルセンサ
４１ 下部ダイベース
４２ 金型
４３ キャビティ
４４ 通湯孔
Ｕ 湯面上限レベル
Ｌ 湯面下限レベル
DESCRIPTION OF SYMBOLS 1 Low pressure casting holding furnace 11 Molten holding chamber 12 Pressurizing chamber 21 Holding chamber lid 22 Tube heater 23 Temperature sensor 24 Molten flow passage port 25 Valve seat installation part 26 Valve seat 27 Shut-off valve 31 Lower flow path 32 Pressurizing part 33 Hot water part 34, 35 Lining member 36 Tube heater 37 Upper sealing lid 38 Gas supply port for pressurization 39 Level sensor 41 Lower die base 42 Mold 43 Cavity 44 Hot water hole U Hot water surface upper limit level L Hot water surface lower limit level

Claims (3)

溶湯保持室と加圧室との間に位置する溶湯流路口を開閉する遮断弁を備えるとともに、前記加圧室が互いに底部で連通する加圧部と出湯部とを備え、かつ、前記溶湯保持室内及び前記加圧室内にチューブヒータを配置した低圧鋳造用保持炉において、前記加圧部及び／または出湯部の内壁面が、円筒状のファインセラミックス製一体焼成物からなる内張部材で形成されたことを特徴とする低圧鋳造用保持炉。   A shutoff valve that opens and closes a melt channel opening located between the molten metal holding chamber and the pressurizing chamber, the pressurizing chamber includes a pressurizing portion and a hot water outlet portion that communicate with each other at the bottom, and the molten metal holding In a holding furnace for low-pressure casting in which a tube heater is disposed in the chamber and the pressurizing chamber, the inner wall surface of the pressurizing portion and / or the tapping portion is formed by a lining member made of a cylindrical fine ceramics monolithic fired product. A low pressure casting holding furnace characterized by the above. 前記ファインセラミックス製一体焼成物が、窒化珪素からなることを特徴とする請求項１に記載の低圧鋳造用保持炉。   2. The holding furnace for low-pressure casting according to claim 1, wherein the integrally fired product made of fine ceramics is made of silicon nitride. 前記溶湯流路口を構成する弁座が、その下部を溶湯流路口の弁座設置部に固定され、上端面を周囲の溶湯保持室底面よりも高位置にするように設けられたことを特徴とする請求項１または２に記載の低圧鋳造用保持炉。
The valve seat constituting the molten metal flow path opening is fixed to the valve seat installation portion of the molten metal flow path opening, and the upper end surface is provided to be higher than the surrounding molten metal holding chamber bottom. The holding furnace for low-pressure casting according to claim 1 or 2.
JP2004340866A 2004-11-25 2004-11-25 Holding furnace for low pressure casting Active JP4615300B2 (en)

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JP2004340866A JP4615300B2 (en) 2004-11-25 2004-11-25 Holding furnace for low pressure casting
CN2005800405365A CN101094740B (en) 2004-11-25 2005-11-14 Holding furnace for quantitative supply of melting solution
PCT/JP2005/020844 WO2006057179A1 (en) 2004-11-25 2005-11-14 Holding furnace for supplying fixed amount of molten metal
US11/791,534 US7790098B2 (en) 2004-11-25 2005-11-14 Molten metal holding furnace
EP05806331A EP1820585B1 (en) 2004-11-25 2005-11-14 Holding furnace for supplying fixed amount of molten metal
AT05806331T ATE525155T1 (en) 2004-11-25 2005-11-14 HOLDING FURNACE FOR SUPPLYING A SOLID QUANTITY OF MELTING METAL
CA002588863A CA2588863A1 (en) 2004-11-25 2005-11-14 Molten metal holding furnace
KR1020077014250A KR101132930B1 (en) 2004-11-25 2005-11-14 Holding furnace for supplying fixed amount of molten metal

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