JP4294996B2 - Ladle - Google Patents

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JP4294996B2
JP4294996B2 JP2003102189A JP2003102189A JP4294996B2 JP 4294996 B2 JP4294996 B2 JP 4294996B2 JP 2003102189 A JP2003102189 A JP 2003102189A JP 2003102189 A JP2003102189 A JP 2003102189A JP 4294996 B2 JP4294996 B2 JP 4294996B2
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molten metal
inert gas
ladle
gas supply
discharge port
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JP2004306074A (en
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清美 高橋
武 山本
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2003102189A priority Critical patent/JP4294996B2/en
Priority to US10/913,274 priority patent/US20050023737A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1518—Tapholes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明はアルミニウム溶湯（以下溶湯とする）を溶解炉から溶湯保持炉に補充する際に使用する取鍋に関する。
【０００２】
【従来の技術】
従来、溶湯を溶解炉から溶湯保持炉に補充する際には、その溶湯が空気中の水蒸気を巻き込んで水素ガスが発生し、そのままの鋳造作業では製品に巣孔（以下鋳巣とする）が形成され、品質上不具合が発生し易かった。
【０００３】
この様な不具合を解消するために、一般には溶湯保持炉内での脱ガス処理を行うが、更には溶湯保持炉での脱ガス処理に加え、溶湯保持炉への溶湯補充前に脱ガス処理を行うものが知られている（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特許第３１９４４１８号公報（２〜３頁、図１）
【０００５】
図６は特許文献１の図１の再掲図であり、１は漏斗、４は貯留部、４ａは貯留部底面、５は配湯部、６は流出口、７は不活性ガス供給手段である。
【０００６】
そして、漏斗１は、取鍋から溶湯保持炉内に溶湯を移し替える際に使用する一種の補助部品で、貯留部４と配湯部５の境界部近傍に、不活性ガスの供給手段７を備える。この供給手段７は、貯留部４の底面４ａに接近させて多孔質のプラグで構成する。
【０００７】
【発明が解決しようとする課題】
特許文献１は、溶湯保持炉と取鍋との間に、漏斗１をわざわざ介在させるものであり、取鍋から漏斗１に溶湯を移し替える時に、多くの空気を巻き込む。
【０００８】
また、不活性ガス供給手段７は、その設置位置が流出口６に近い部位に設けてあることから、溶湯の吐出後、湯切れを十分に行わないと目詰まりの原因となる。この問題を避けるために常に不活性ガスを吐出しておく事が考えられるが、この場合は、ガスの無駄使いによる生産コストアップの問題が発生する。
【０００９】
そこで本発明の目的は、不活性ガス供給手段の目詰まりを防いで不活性ガスの吐出効果を高めることができ、水蒸気から発生する水素ガスの溶湯保持炉への混入を低減して、鋳造製品の品質向上に寄与する取鍋を提供することにある。
【００１０】
【課題を解決するための手段】
上記目的を達成するために請求項１は、アルミニウム溶解炉で溶解した溶湯を、鋳造機に付属する溶湯保持炉へ運搬する取鍋であって、溶湯を吐出する溶湯吐出口に、溶湯中へ不活性ガスを注入する不活性ガス供給ノズルを備えた取鍋において、
前記不活性ガス供給ノズルは、溶湯吐出口に向う溶湯通路に上から差し込まれ、
不活性ガス供給ノズルの先端面が、溶湯吐出口に向う溶湯通路の底面に対して、溶湯吐出口に向って上り勾配となるように構成されていることを特徴とする。
【００１１】
取鍋は、溶解炉から溶湯を必要量採取し、この溶湯を溶湯保持炉へ移す装置である。溶湯を溶湯保持炉へ注入する際に、取鍋の溶湯吐出口近傍において、取鍋に備えた不活性ガス供給ノズルより、溶湯に不活性ガスを注入することで、水素ガス対策を講じる。
【００１２】
そして、不活性ガス供給ノズルは、溶湯吐出口に向う溶湯通路に上から差し込まれ、取鍋の溶湯吐出口に向う溶湯通路の底面に対して、ノズルの先端面が溶湯吐出口に向って上り勾配となるように構成した。
先端面が溶湯吐出口に向いているため、溶湯が直接的に不活性ガス供給ノズルの先端面に衝突することはない。この結果、不活性ガス供給ノズルの先端が溶湯で目詰りする心配がなくなる。
【００１３】
また、先端面が溶湯吐出口に向いているため、不活性ガスが溶湯を溶湯吐出口へ押出す作用をなし、特に取鍋から溶湯保持炉への注湯末期において、溶湯吐出口に残留する溶湯をガスの流れで効果的に溶湯保持炉へ押出すことができ、取鍋の湯切れ性を高めることができる。
【００１４】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
【００１５】
取鍋の構造を説明する前に、取鍋の使用例を説明する。
図１は本発明に係る取鍋の使用例を示す図であり、アルミニウム溶解炉１０に対して鋳造機２０はある適度の距離をおいて設置するため、取鍋３０が必要となる。すなわち、アルミニウム溶解炉１０の出湯口１１に取鍋３０を臨ませてアルミニウムの溶湯を受ける。取鍋３０をロボットアーム２５の作用で、矢印▲１▼、▲２▼のごとく移動し、鋳造機２０に付属する溶湯保持炉４０に臨ませる。
【００１６】
溶湯保持炉４０の蓋４１を開き、ロボットアーム２５により取鍋３０を傾けて、溶湯を溶湯保持炉４０へ注入する。
溶湯保持炉４０では、加圧口４２から不活性ガスを吹込むことで湯面を押し下げ、この作用によりストーク４３を介して金型４４へ溶湯を供給する。鋳造を繰り返すことで溶湯保持炉４０に貯留する溶湯が減るため、適宜、取鍋３０を用いて溶湯を補充する必要がある。
【００１７】
図２は本発明に係る取鍋の断面図であり、取鍋３０は、取鍋本体３１と、取鍋本体３１に設けた溶湯吐出口３２と、溶湯吐出口３２近傍に設けた不活性ガス供給ノズル３３とからなる。耐火材ライニングは省略した。
ただし、前記不活性ガス供給ノズル３３は、溶湯吐出口３２に向う溶湯通路３４の底面３５に対して、ノズルの先端面３６が溶湯吐出口３２に向って上り勾配となるように構成する。すなわち、ノズルの先端面３６と底面３５とのなす角度θを１０°以上、好ましくは３０°〜６０°に設定する。
【００１８】
角度θが１０°未満であると溶湯がノズルの先端に侵入しやすくなる。取付け誤差や取鍋の傾動動作を考慮すると、安全を見込んで３０°以上にすることが望ましい。しかし、角度θが６０°を超えると溶湯の流れと吹出したガスの流れが近似するため、ガスが溶湯に混ざりにくくなる。そこで、角度θは３０°〜６０°の範囲に収める。
【００１９】
図３は本発明に係る取鍋の正面図であり、取鍋３０の取鍋本体３１は、連結軸２１で軸受２６、２７を介して第１ロボットアーム２２に取付け、この連結軸２１をモータ２８で回転させる。この結果、図２において、取鍋３０を連結軸２１廻りに自在に傾動させることができる。
【００２０】
以上の構成からなる取鍋の作用を次に説明する。
図４は本発明に係る不活性ガス供給ノズルの作用説明図である。（ａ）は比較例を示し、（ｂ）実施例を示す。
（ａ）の比較例では、不活性ガス供給ノズル１０１を溶湯通路１０２の底面１０３に直角に配置した。矢印▲３▼のごとく溶湯が流れるが、この溶湯の一部が矢印▲４▼のごとく不活性ガス供給ノズル１０１の先端に侵入し、同先端が詰まる虞がある。
【００２１】
（ｂ）の実施例では、ノズル先端面３６を溶湯通路３４の底面３５に対して、溶湯吐出口３２に向って上り勾配となるように設置した。矢印▲５▼のごとく溶湯が流れ、この溶湯の一部が矢印▲６▼のごとく上向き流れとなっても、ノズル先端面３６が傾斜しているため、不活性ガス供給ノズル３３の先端に侵入する心配はない。この結果、長期間にわたって安定的に溶湯へ不活性ガスを供給することができる。
【００２２】
図５は本発明に係る不活性ガス供給ノズルの別実施例図である。
（ａ）は不活性ガス供給ノズル３３を、底面３５に直角に且つ下向きに設置した例であり、不活性ガス供給ノズル３３はいわゆる「はす（斜）」に切断し、得られたノズル先端面３６を溶湯吐出口３２に向けた。この結果、ノズル先端面３６は、溶湯通路３４の底面３５に対して、溶湯吐出口３２に向って上り勾配となる。
【００２３】
図２では不活性ガス供給ノズル３３を斜めに取付ける必要があり、取鍋３０への不活性ガス供給ノズル３３の取付けには注意を要した。この点、この別実施例は、不活性ガス供給ノズル３３を底面３５に直角に配置することができるので、取鍋３０への不活性ガス供給ノズル３３の取付けは、簡単になり取鍋３０の製造コストを下げることができる。
【００２４】
（ｂ）は不活性ガス供給ノズル３３の下部を湾曲形状にし、ノズルの先端面３６が、溶湯通路３４の底面３５に対して、溶湯吐出口３２に向って上り勾配となるようにした。
【００２５】
この別実施例は、不活性ガス供給ノズル３３の先端をはすに切断する必要はなく、単に曲げるだけで済む。図２では不活性ガス供給ノズル３３を斜めに取付ける必要があり、取鍋３０への不活性ガス供給ノズル３３の取付けには注意を要した。この点、この別実施例は、不活性ガス供給ノズル３３を底面３５に直角に取付けることができるので、取鍋３０への不活性ガス供給ノズル３３の取付けは、簡単になり取鍋３０の製造コストを下げることができる。
【００２６】
以上、図４（ｂ）及び図５（ａ）、（ｂ）のように、ノズル先端面３６が溶湯吐出口３２に向って上り勾配となるように構成したことで、不活性ガス供給ノズル３３の先端に溶湯が侵入する心配はない。従って、長期間にわたって安定的に溶湯へ不活性ガスを供給することができる。
この結果、取鍋３０は、不活性ガスの吐出効果を高め、溶湯を十分に脱気することから、鋳造製品の鋳巣を低減して品質向上を可能にする。
【００２７】
【実施例】
本発明に係る実施例を次に説明する。
○鋳造条件
使用した取鍋の不活性ガス供給ノズル：図２タイプ
不活性ガス供給時間：１０秒間
注入タイミング：取鍋の傾動開始時から傾動停止時まで。
吐出不活性ガス量：８００ｃｍ３
取鍋中の溶湯量：２２ｋｇ
溶湯種類：アルミニウム合金鋳物（ＪＩＳ ＡＣ４Ｃ）
【００２８】
○評価
以上の条件で得た鋳造物において、不活性ガス供給ノズルが従来の型｛図４（ａ）｝である取鍋を使用して製造した鋳造物に対して、鋳巣の数が著しく減少した。
【００２９】
尚、不活性ガス供給ノズル３３の先端面３６は、溶湯通路３４の底面３５に対して、溶湯吐出口３２に向って上り勾配となるように構成していれば、細かい形状は問わない。また、不活性ガス供給ノズル３３の本数も問わない。
【００３０】
また、本発明の取鍋３０はアルミニウム合金溶湯を取扱い対象としたが、本発明の取鍋３０を、マグネシウム合金、銅合金、鋳鉄などの溶湯に適用することは差し支えない。
【００３１】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１では、取鍋に付属させる不活性ガス供給ノズルにおいて、不活性ガス供給ノズルの先端面が、溶湯吐出口に向う溶湯通路の底面に対して、溶湯吐出口に向って上り勾配となるように、前記不活性ガス供給ノズルを構成したことを特徴とする。
【００３２】
不活性ガス供給ノズルの先端面が溶湯吐出口に向いているため、溶湯が直接的に不活性ガス供給ノズルの先端面に衝突することはない。この結果、不活性ガス供給ノズルの先端が溶湯で目詰りする心配がなくなる。
【００３３】
また、不活性ガス供給ノズルは、先端面が溶湯吐出口に向いているため、不活性ガスが溶湯を溶湯吐出口へ押出す作用をなし、特に取鍋から溶湯保持炉への注湯末期において、溶湯吐出口に残留する溶湯をガスの流れで効果的に溶湯保持炉へ押出すことができ、取鍋の湯切れ性を高めることができる。
【図面の簡単な説明】
【図１】本発明に係る取鍋の使用例を示す図
【図２】本発明に係る取鍋の断面図
【図３】本発明に係る取鍋の正面図
【図４】本発明に係る不活性ガス供給ノズルの作用説明図
【図５】本発明に係る不活性ガス供給ノズルの別実施例図
【図６】特許文献１の図１の再掲図
【符号の説明】
１０…アルミニウム溶解炉、２０…鋳造機、３０…取鍋、３１…取鍋本体、３２…溶湯吐出口、３３…不活性ガス供給ノズル、３４…溶湯通路、３５…溶湯通路の底面、３６…ノズルの先端面、４０…溶湯保持炉。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladle used when refilling molten aluminum (hereinafter referred to as molten metal) from a melting furnace to a molten metal holding furnace.
[0002]
[Prior art]
Conventionally, when the molten metal is replenished from the melting furnace to the molten metal holding furnace, the molten metal entrains water vapor in the air to generate hydrogen gas, and in the casting operation as it is, there are burrows (hereinafter referred to as casting cavities) in the product. It was formed and it was easy for quality problems to occur.
[0003]
In order to eliminate such problems, the degassing process is generally performed in the molten metal holding furnace. In addition to the degassing process in the molten metal holding furnace, the degassing process is performed before the molten metal is supplied to the molten metal holding furnace. (For example, refer to Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 3194418 (2-3 pages, FIG. 1)
[0005]
FIG. 6 is a reprint of FIG. 1 of Patent Document 1, wherein 1 is a funnel, 4 is a storage section, 4a is a storage section bottom surface, 5 is a hot water supply section, 6 is an outlet, and 7 is an inert gas supply means. .
[0006]
The funnel 1 is a kind of auxiliary part used when the molten metal is transferred from the ladle into the molten metal holding furnace, and an inert gas supply means 7 is provided in the vicinity of the boundary between the storage unit 4 and the hot water distribution unit 5. Prepare. This supply means 7 is made close to the bottom surface 4a of the storage part 4 and is constituted by a porous plug.
[0007]
[Problems to be solved by the invention]
In Patent Document 1, a funnel 1 is purposely interposed between a molten metal holding furnace and a ladle, and a large amount of air is involved when the molten metal is transferred from the ladle to the funnel 1.
[0008]
Moreover, since the installation position of the inert gas supply means 7 is provided in the site | part close | similar to the outflow port 6, it will become a cause of clogging, if a hot water run is not fully performed after discharge of a molten metal. In order to avoid this problem, it is conceivable to always discharge an inert gas. In this case, however, a problem of an increase in production cost due to waste of gas occurs.
[0009]
Therefore, an object of the present invention is to prevent clogging of the inert gas supply means and enhance the discharge effect of the inert gas, reduce mixing of hydrogen gas generated from water vapor into the molten metal holding furnace, and cast product The purpose is to provide a ladle that contributes to the improvement of quality.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a ladle for transporting molten metal melted in an aluminum melting furnace to a molten metal holding furnace attached to a casting machine, and into the molten metal discharge port for discharging the molten metal. In a ladle equipped with an inert gas supply nozzle for injecting an inert gas,
The inert gas supply nozzle is inserted from above into the molten metal passage toward the molten metal discharge port,
The distal end surface of the inert gas supply nozzles, with respect to the bottom surface of the molten metal passage towards the molten metal discharge port, characterized in that it is configure so that the rising gradient towards the molten metal discharge port.
[0011]
The ladle is a device that collects a required amount of molten metal from a melting furnace and transfers the molten metal to a molten metal holding furnace. When pouring the molten metal into the molten metal holding furnace, measures against hydrogen gas are taken by injecting an inert gas into the molten metal from an inert gas supply nozzle provided in the ladle near the molten metal discharge port of the ladle.
[0012]
The inert gas supply nozzle is inserted into the molten metal passage toward the molten metal discharge port from above , and the tip end surface of the nozzle rises toward the molten metal discharge port with respect to the bottom surface of the molten metal channel toward the molten metal discharge port of the ladle. It was configured to be a gradient.
Since the tip surface faces the melt discharge port, the melt does not directly collide with the tip surface of the inert gas supply nozzle. As a result, there is no fear that the tip of the inert gas supply nozzle is clogged with the molten metal.
[0013]
In addition, since the tip side faces the molten metal discharge port, the inert gas acts to push the molten metal to the molten metal discharge port, and particularly remains at the molten metal discharge port at the end of pouring from the ladle to the molten metal holding furnace. The molten metal can be effectively extruded into the molten metal holding furnace with the flow of gas, and the hotness of the ladle can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
[0015]
Before explaining the structure of the ladle, an example of using the ladle will be explained.
FIG. 1 is a diagram showing an example of use of a ladle according to the present invention, and a ladle 30 is necessary because the casting machine 20 is installed at a certain distance from the aluminum melting furnace 10. That is, the ladle 30 is made to face the outlet 11 of the aluminum melting furnace 10 to receive the molten aluminum. The ladle 30 is moved by the action of the robot arm 25 as indicated by arrows {circle around (1)} and {circle around (2)} and faces the molten metal holding furnace 40 attached to the casting machine 20.
[0016]
The lid 41 of the molten metal holding furnace 40 is opened, the ladle 30 is tilted by the robot arm 25, and the molten metal is injected into the molten metal holding furnace 40.
In the molten metal holding furnace 40, the molten metal is pushed down by blowing an inert gas from the pressurizing port 42, and the molten metal is supplied to the mold 44 through the stalk 43 by this action. Since the molten metal stored in the molten metal holding furnace 40 is reduced by repeating the casting, it is necessary to replenish the molten metal using the ladle 30 as appropriate.
[0017]
FIG. 2 is a sectional view of a ladle according to the present invention. A ladle 30 includes a ladle body 31, a molten metal discharge port 32 provided in the ladle main body 31, and an inert gas provided in the vicinity of the molten metal discharge port 32. And a supply nozzle 33. The refractory lining was omitted.
However, the inert gas supply nozzle 33 is configured such that the tip surface 36 of the nozzle is inclined upward toward the molten metal discharge port 32 with respect to the bottom surface 35 of the molten metal passage 34 facing the molten metal discharge port 32. That is, the angle θ formed by the tip surface 36 and the bottom surface 35 of the nozzle is set to 10 ° or more, preferably 30 ° to 60 °.
[0018]
When the angle θ is less than 10 °, the molten metal easily enters the tip of the nozzle. Considering mounting errors and tilting movement of the ladle, it is desirable to make it 30 ° or more for safety. However, when the angle θ exceeds 60 °, the flow of the molten metal and the flow of the blown-out gas are approximated, so that it is difficult for the gas to mix with the molten metal. Therefore, the angle θ falls within the range of 30 ° to 60 °.
[0019]
FIG. 3 is a front view of a ladle according to the present invention. A ladle body 31 of the ladle 30 is attached to the first robot arm 22 via bearings 26 and 27 by a connecting shaft 21, and the connecting shaft 21 is connected to a motor. Rotate at 28. As a result, the ladle 30 can be freely tilted around the connecting shaft 21 in FIG.
[0020]
Next, the operation of the ladle having the above configuration will be described.
FIG. 4 is an operation explanatory view of the inert gas supply nozzle according to the present invention. (A) shows a comparative example, (b) shows an example.
In the comparative example (a), the inert gas supply nozzle 101 is disposed at right angles to the bottom surface 103 of the molten metal passage 102. Although the molten metal flows as indicated by the arrow (3), a part of the molten metal may enter the tip of the inert gas supply nozzle 101 as indicated by the arrow (4) and the tip may be clogged.
[0021]
In the embodiment of (b), the nozzle tip surface 36 is installed so as to be inclined upward toward the melt discharge port 32 with respect to the bottom surface 35 of the melt passage 34. Even when the molten metal flows as indicated by the arrow (5) and a part of the molten metal flows upward as indicated by the arrow (6), the nozzle tip surface 36 is inclined, so that it enters the tip of the inert gas supply nozzle 33. There is no worry to do. As a result, the inert gas can be stably supplied to the molten metal over a long period of time.
[0022]
FIG. 5 is a diagram showing another embodiment of the inert gas supply nozzle according to the present invention.
(A) is an example in which the inert gas supply nozzle 33 is installed at a right angle to the bottom surface 35 and facing downward, and the inert gas supply nozzle 33 is cut into a so-called “lotus” and the tip of the nozzle obtained. The surface 36 was directed to the molten metal discharge port 32. As a result, the nozzle tip surface 36 has an upward slope toward the molten metal discharge port 32 with respect to the bottom surface 35 of the molten metal passage 34.
[0023]
In FIG. 2, it is necessary to attach the inert gas supply nozzle 33 at an angle, and attention is required for attaching the inert gas supply nozzle 33 to the ladle 30. In this respect, in this alternative embodiment, the inert gas supply nozzle 33 can be disposed at a right angle to the bottom surface 35. Therefore, the attachment of the inert gas supply nozzle 33 to the ladle 30 is simplified, and Manufacturing cost can be reduced.
[0024]
In (b), the lower part of the inert gas supply nozzle 33 is curved, and the tip surface 36 of the nozzle is inclined upward toward the melt discharge port 32 with respect to the bottom surface 35 of the melt passage 34.
[0025]
In this alternative embodiment, it is not necessary to cut the tip of the inert gas supply nozzle 33 into a lot, but it can be simply bent. In FIG. 2, it is necessary to attach the inert gas supply nozzle 33 at an angle, and attention is required for attaching the inert gas supply nozzle 33 to the ladle 30. In this respect, in this alternative embodiment, the inert gas supply nozzle 33 can be attached to the bottom surface 35 at a right angle, so that the attachment of the inert gas supply nozzle 33 to the ladle 30 is simplified and the ladle 30 is manufactured. Cost can be reduced.
[0026]
As described above, the inert gas supply nozzle 33 is configured such that the nozzle tip surface 36 is inclined upward toward the molten metal discharge port 32 as shown in FIGS. 4B, 5 </ b> A, and 5 </ b> B. There is no worry that the molten metal enters the tip of the. Therefore, the inert gas can be stably supplied to the molten metal over a long period of time.
As a result, the ladle 30 enhances the discharge effect of the inert gas and sufficiently deaerates the molten metal, so that the quality of the cast product can be reduced and the quality can be improved.
[0027]
【Example】
Embodiments according to the present invention will now be described.
○ Casting inert gas supply nozzle of ladle used: Fig. 2 type inert gas supply time: 10 seconds Injection timing: From the start of tilting of the ladle to the stop of tilting.
Discharged inert gas amount: 800 cm 3
The amount of molten metal in the ladle: 22kg
Molten metal type: cast aluminum alloy (JIS AC4C)
[0028]
○ In the castings obtained under the conditions above the evaluation, the number of cavities is significantly higher than the castings manufactured using the ladle whose inert gas supply nozzle is the conventional mold {Fig. 4 (a)}. Diminished.
[0029]
The tip end surface 36 of the inert gas supply nozzle 33 may have any fine shape as long as it is configured to rise upward toward the molten metal discharge port 32 with respect to the bottom surface 35 of the molten metal passage 34. Further, the number of the inert gas supply nozzles 33 is not limited.
[0030]
Moreover, although the ladle 30 of the present invention is intended for handling molten aluminum alloy, the ladle 30 of the present invention may be applied to molten metal such as magnesium alloy, copper alloy, cast iron and the like.
[0031]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to claim 1, in the inert gas supply nozzle attached to the ladle, the tip surface of the inert gas supply nozzle has an upward slope toward the molten metal discharge port with respect to the bottom surface of the molten metal passage toward the molten metal discharge port. As described above, the inert gas supply nozzle is configured.
[0032]
Since the tip surface of the inert gas supply nozzle faces the melt discharge port, the melt does not directly collide with the tip surface of the inert gas supply nozzle. As a result, there is no fear that the tip of the inert gas supply nozzle is clogged with the molten metal.
[0033]
In addition, the inert gas supply nozzle has its tip end facing the molten metal discharge port, so the inert gas pushes the molten metal to the molten metal discharge port, especially at the end of pouring from the ladle to the molten metal holding furnace. The molten metal remaining at the molten metal discharge port can be effectively pushed out to the molten metal holding furnace by the flow of gas, and the hot water cutting property of the ladle can be enhanced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of use of a ladle according to the present invention. FIG. 2 is a sectional view of the ladle according to the present invention. FIG. 3 is a front view of the ladle according to the present invention. FIG. 5 is a diagram illustrating another embodiment of the inert gas supply nozzle according to the present invention. FIG. 6 is a reprint of FIG. 1 of Patent Document 1.
DESCRIPTION OF SYMBOLS 10 ... Aluminum melting furnace, 20 ... Casting machine, 30 ... Ladle body, 31 ... Ladle main body, 32 ... Molten discharge port, 33 ... Inert gas supply nozzle, 34 ... Molten channel, 35 ... Bottom of molten metal channel, 36 ... Nozzle tip surface, 40 ... molten metal holding furnace.

Claims (1)

アルミニウム溶解炉で溶解した溶湯を、鋳造機に付属する溶湯保持炉へ運搬する取鍋であって、溶湯を吐出する溶湯吐出口に、溶湯中へ不活性ガスを注入する不活性ガス供給ノズルを備えた取鍋において、
前記不活性ガス供給ノズルは、溶湯吐出口に向う溶湯通路に上から差し込まれ、
不活性ガス供給ノズルの先端面が、溶湯吐出口に向う溶湯通路の底面に対して、溶湯吐出口に向って上り勾配となるように構成されていることを特徴とする取鍋。It is a ladle that transports the molten metal melted in the aluminum melting furnace to the molten metal holding furnace attached to the casting machine, and an inert gas supply nozzle that injects an inert gas into the molten metal at the molten metal discharge port for discharging the molten metal. In the prepared ladle,
The inert gas supply nozzle is inserted from above into the molten metal passage toward the molten metal discharge port,
Ladle distal end surface of the inert gas supply nozzles, with respect to the bottom surface of the molten metal passage towards the molten metal discharge port, characterized in that it is configure so that the rising gradient towards the molten metal discharge port.
JP2003102189A 2003-04-04 2003-04-04 Ladle Expired - Fee Related JP4294996B2 (en)

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US8522857B2 (en) * 2011-06-09 2013-09-03 GM Global Technology Operations LLC Ladle for molten metal
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US11027333B2 (en) * 2019-03-22 2021-06-08 Sukhjinder Kullar Liquid-resistant direct-drive robotic ladler

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