JP2016141884A - Method for removing inclusion - Google Patents

Method for removing inclusion Download PDF

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JP2016141884A
JP2016141884A JP2015021400A JP2015021400A JP2016141884A JP 2016141884 A JP2016141884 A JP 2016141884A JP 2015021400 A JP2015021400 A JP 2015021400A JP 2015021400 A JP2015021400 A JP 2015021400A JP 2016141884 A JP2016141884 A JP 2016141884A
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molten metal
ultrasonic
ultrasonic transducer
inclusion
ultrasonic vibration
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JP6384345B2 (en
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時春 福田
Tokiharu Fukuda
時春 福田
雄一 古川
Yuichi Furukawa
雄一 古川
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Toyota Motor Corp
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Abstract

PROBLEM TO BE SOLVED: To flocculate inclusions floated on a molten metal surface by applying ultrasonic vibration to a molten metal.SOLUTION: Provided is a method for removing inclusions where inclusions 3 in a molten metal 1 are removed, comprising: a step where an edge face 11b of an ultrasonic vibrator 11 is made close to a molten metal surface 1a; and a step where, while contacting the molten metal 1 to the edge face 11b of the ultrasonic vibrator 11, ultrasonic vibration is applied thereto. In the step of imparting the ultrasonic vibration, without contacting the edge face 11b of the ultrasonic vibrator 11 to the molten metal surface 1a, after the start of the ultrasonic vibration to the molten metal 1, the oscillated molten metal 1 is contacted to the edge face 11b of the ultrasonic vibrator 11, and the position of the edge face 11b of the ultrasonic vibrator 11 is made higher than the molten metal surface 1a.SELECTED DRAWING: Figure 2

Description

本発明は介在物除去方法に関し、特に溶湯に超音波振動を付与することにより溶湯内の介在物を除去する介在物除去方法に関する。   The present invention relates to an inclusion removal method, and more particularly to an inclusion removal method for removing inclusions in a molten metal by applying ultrasonic vibration to the molten metal.

溶湯に超音波振動を付与することにより、溶湯の脱ガスや介在物除去を行う技術が、知られている。特許文献１には、脱ガス用ガスを溶湯中に吹き込むための吹込パイプに超音波振動子を設け、溶湯の脱ガス及び酸化物除去（すなわち介在物除去）を促進する技術が開示されている。ここで、超音波振動子が溶湯に浸漬されているため、溶湯に超音波振動が付与される。   Techniques for degassing molten metal and removing inclusions by applying ultrasonic vibration to the molten metal are known. Patent Document 1 discloses a technique in which an ultrasonic vibrator is provided in a blowing pipe for blowing a degassing gas into a molten metal to promote degassing and oxide removal (that is, inclusion removal) of the molten metal. . Here, since the ultrasonic vibrator is immersed in the molten metal, ultrasonic vibration is applied to the molten metal.

特開平９−１１８９３８号公報Japanese Patent Laid-Open No. 9-118938

発明者らは、溶湯内の介在物除去方法において以下の問題点を見出した。
特許文献１に記載されているように、溶湯内に存在する酸化物などの介在物は、溶湯の超音波振動により湯面（溶湯表面）に浮上する。しかしながら、特許文献１に記載の技術では、湯面に浮上した介在物は、湯面の全体に広がって分布するため、例えば回収して除去することが難しいという問題があった。 The inventors have found the following problems in the method for removing inclusions in the molten metal.
As described in Patent Document 1, inclusions such as oxides existing in the molten metal float on the molten metal surface (molten metal surface) by ultrasonic vibration of the molten metal. However, the technique described in Patent Document 1 has a problem that inclusions floating on the molten metal surface are distributed over the entire molten metal surface, so that it is difficult to recover and remove, for example.

本発明は、上記に鑑みなされたものであって、溶湯に超音波振動を付与することにより湯面に浮上した介在物を凝集させるものである。   This invention is made | formed in view of the above, Comprising: The inclusion which floated on the hot_water | molten_metal surface is aggregated by providing ultrasonic vibration to a molten metal.

本発明の一態様に係る介在物除去方法は、
溶湯内の介在物を除去する介在物除去方法であって、
超音波振動子の端面を湯面に近付けるステップと、
前記超音波振動子の前記端面に前記溶湯を接触させつつ、超音波振動を付与するステップと、を備え、
前記超音波振動を付与するステップにおいて、
前記超音波振動子の前記端面を前記湯面に接触させずに、前記溶湯への前記超音波振動を開始した後、搖動した前記溶湯を前記超音波振動子の前記端面に接触させ、
前記超音波振動子の前記端面の位置を、前記湯面よりも高くするものである。 The inclusion removal method according to one embodiment of the present invention includes:
An inclusion removal method for removing inclusions in the molten metal,
A step of bringing the end face of the ultrasonic transducer close to the surface of the molten metal;
Applying ultrasonic vibration while bringing the molten metal into contact with the end face of the ultrasonic vibrator, and
In applying the ultrasonic vibration,
Without starting the ultrasonic vibration to the molten metal without contacting the end surface of the ultrasonic vibrator to the molten metal surface, the peristated molten metal is brought into contact with the end surface of the ultrasonic vibrator,
The position of the end face of the ultrasonic transducer is set higher than the molten metal surface.

本発明の一態様に係る介在物除去方法は、
溶湯内の介在物を除去する介在物除去方法であって、
超音波振動子の端面を湯面に近付けるステップと、
前記超音波振動子の前記端面に前記溶湯を接触させつつ、超音波振動を付与するステップと、を備え、
前記超音波振動を付与するステップにおいて、
前記超音波振動子の前記端面を前記湯面に接触させた後、前記溶湯への前記超音波振動を開始するとともに前記超音波振動子を引き上げ、
前記超音波振動子の前記端面の位置を、前記湯面よりも高くするものである。 The inclusion removal method according to one embodiment of the present invention includes:
An inclusion removal method for removing inclusions in the molten metal,
A step of bringing the end face of the ultrasonic transducer close to the surface of the molten metal;
Applying ultrasonic vibration while bringing the molten metal into contact with the end face of the ultrasonic vibrator, and
In applying the ultrasonic vibration,
After bringing the end face of the ultrasonic transducer into contact with the molten metal surface, the ultrasonic vibration to the molten metal is started and the ultrasonic transducer is pulled up,
The position of the end face of the ultrasonic transducer is set higher than the molten metal surface.

本発明に係る介在物除去方法では、超音波振動子の端面の位置を、湯面よりも高くして、溶湯へ超音波振動を付与する。すなわち、超音波振動子の端面と接触している溶湯を、表面張力により湯面から持ち上げている。この表面張力により、湯面に浮上した介在物を超音波振動子の周囲に凝集させることができる。   In the inclusion removal method according to the present invention, the position of the end face of the ultrasonic transducer is made higher than the molten metal surface to apply ultrasonic vibration to the molten metal. That is, the molten metal in contact with the end face of the ultrasonic transducer is lifted from the molten metal surface by surface tension. Due to this surface tension, inclusions floating on the molten metal surface can be aggregated around the ultrasonic vibrator.

本発明により、溶湯に超音波振動を付与することにより湯面に浮上した介在物を凝集させることができる。   According to the present invention, inclusions floating on the molten metal surface can be aggregated by applying ultrasonic vibration to the molten metal.

本発明の第１の実施の形態に係る介在物除去装置の模式的断面図である。It is typical sectional drawing of the inclusion removal apparatus which concerns on the 1st Embodiment of this invention. 図１における湯面１ａ近傍の拡大図である。It is an enlarged view of the hot water surface 1a vicinity in FIG. 超音波振動付与による介在物除去効果を示すグラフである。It is a graph which shows the inclusion removal effect by ultrasonic vibration provision. 超音波振動付与による脱ガス効果を示すグラフである。It is a graph which shows the degassing effect by ultrasonic vibration provision. 本発明の第１の実施の形態に係る介在物除去方法を示すフローチャートである。It is a flowchart which shows the inclusion removal method which concerns on the 1st Embodiment of this invention. 本発明の第１の実施の形態の変形例に係る介在物除去装置の模式的断面図である。It is typical sectional drawing of the inclusion removal apparatus which concerns on the modification of the 1st Embodiment of this invention.

以下、本発明を適用した具体的な実施の形態について、図面を参照しながら詳細に説明する。ただし、本発明が以下の実施の形態に限定される訳ではない。また、説明を明確にするため、以下の記載及び図面は、適宜、簡略化されている。   Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiment. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

（第１の実施の形態）
まず、図１を参照して、本発明の第１の実施の形態に係る介在物除去装置について説明する。図１は、本発明の第１の実施の形態に係る介在物除去装置の模式的断面図である。図１に示すように、本発明の第１の実施の形態に係る介在物除去装置１０は、超音波振動子１１、超音波発振器１２、支持アーム１３、昇降ガイド１４、昇降ロッド１５、振動アブソーバ１６、昇降シリンダ１７、台座１８を備えている。 (First embodiment)
First, the inclusion removal apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view of an inclusion removal apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the inclusion removal apparatus 10 according to the first embodiment of the present invention includes an ultrasonic transducer 11, an ultrasonic oscillator 12, a support arm 13, a lifting guide 14, a lifting rod 15, and a vibration absorber. 16, a lifting cylinder 17 and a pedestal 18 are provided.

なお、当然のことながら、図１に示した右手系ｘｙｚ座標は、構成要素の位置関係を説明するための便宜的なものである。図１におけるｘｙ平面は水平面を構成し、ｚ軸方向が鉛直方向である。より具体的には、ｚ軸のプラス方向が鉛直上向きとなる。   As a matter of course, the right-handed xyz coordinates shown in FIG. 1 are convenient for explaining the positional relationship of the components. The xy plane in FIG. 1 constitutes a horizontal plane, and the z-axis direction is the vertical direction. More specifically, the positive direction of the z axis is vertically upward.

超音波振動子１１は、超音波発振器１２の底面から鉛直方向下向き（ｚ軸方向マイナス向き）に延設されている。超音波振動子１１は、例えば、ＳＫＤ６１などの鉄系合金からなる円柱状の部材である。保持炉２０に収容された溶湯１に超音波振動子１１の先端部を接触させることにより、超音波発振器１２から出力された超音波振動が溶湯１に付与される。
なお、図１に示すように、溶湯１と接触する超音波振動子１１の先端部には、例えばＳｉＣなどからなるセラミック部材１１ａが装着されていることが好ましい。セラミック部材１１ａにより、超音波振動子１１の溶損を抑制し、超音波振動子１１の寿命を向上させることができる。なお、セラミック部材１１ａは必須ではない。 The ultrasonic transducer 11 extends downward from the bottom surface of the ultrasonic oscillator 12 in the vertical direction (z-axis direction minus direction). The ultrasonic transducer 11 is a cylindrical member made of an iron-based alloy such as SKD61, for example. The ultrasonic vibration output from the ultrasonic oscillator 12 is applied to the molten metal 1 by bringing the tip of the ultrasonic transducer 11 into contact with the molten metal 1 accommodated in the holding furnace 20.
As shown in FIG. 1, it is preferable that a ceramic member 11 a made of, for example, SiC is attached to the tip of the ultrasonic vibrator 11 that is in contact with the molten metal 1. The ceramic member 11a can suppress melting of the ultrasonic vibrator 11 and improve the life of the ultrasonic vibrator 11. The ceramic member 11a is not essential.

超音波発振器１２は、昇降ガイド１４から水平方向（図１ではｘ軸方向プラス側）に延設された支持アーム１３の先端に固定されている。すなわち、超音波発振器１２は、支持アーム１３を介して昇降ガイド１４に連結されている。また、超音波発振器１２と昇降ガイド１４との間には、振動アブソーバ１６が支持アーム１３と略平行に設けられている。振動アブソーバ１６により、超音波発振器１２に連結された昇降ガイド１４の振動が抑制される。   The ultrasonic oscillator 12 is fixed to the tip of a support arm 13 that extends in a horizontal direction (in FIG. 1, in the x-axis direction plus side) from the lifting guide 14. That is, the ultrasonic oscillator 12 is connected to the lifting guide 14 via the support arm 13. Further, a vibration absorber 16 is provided substantially in parallel with the support arm 13 between the ultrasonic oscillator 12 and the lifting guide 14. The vibration absorber 16 suppresses the vibration of the elevating guide 14 connected to the ultrasonic oscillator 12.

昇降ガイド１４は、例えば昇降ロッド１５を通す貫通孔（不図示）を有するパイプ状の金属部材であって、昇降ロッド１５にスライド自在に装着されている。ここで、昇降ロッド１５は、台座１８から鉛直方向に延設された例えば円柱状の金属部材である。また、昇降ガイド１４は、昇降ロッド１５と略平行に設けられた昇降シリンダ１７に連結されており、鉛直方向にスライドすることができる。すなわち、超音波振動子１１が鉛直方向に移動できる。具体的には、湯面センサ（不図示）に検出された湯面１ａの高さに応じて、昇降シリンダ１７が駆動することにより、超音波振動子１１と湯面１ａとの距離を一定すなわち所定の範囲に維持することができる。   The elevating guide 14 is a pipe-like metal member having, for example, a through hole (not shown) through which the elevating rod 15 passes, and is slidably attached to the elevating rod 15. Here, the elevating rod 15 is, for example, a cylindrical metal member extending in the vertical direction from the pedestal 18. Moreover, the raising / lowering guide 14 is connected with the raising / lowering cylinder 17 provided substantially parallel to the raising / lowering rod 15, and can slide to a perpendicular direction. That is, the ultrasonic transducer 11 can move in the vertical direction. Specifically, the elevation cylinder 17 is driven according to the height of the molten metal surface 1a detected by the molten metal surface sensor (not shown), so that the distance between the ultrasonic transducer 11 and the molten metal surface 1a is constant. The predetermined range can be maintained.

次に、図２を参照して、超音波振動の付与による溶湯１からの介在物除去及び脱ガスのメカニズムについて説明する。図２は、図１における湯面１ａ近傍の拡大図である。図２に示すように、湯面１ａ近傍には、ガスノズル３０を介して、アルゴンガスや窒素ガスなどの不活性ガスが導入されている。この不活性ガスにより、湯面１ａの酸化を抑制することができる。   Next, with reference to FIG. 2, the mechanism of inclusion removal and degassing from the molten metal 1 by applying ultrasonic vibration will be described. FIG. 2 is an enlarged view of the vicinity of the molten metal surface 1a in FIG. As shown in FIG. 2, an inert gas such as argon gas or nitrogen gas is introduced in the vicinity of the hot water surface 1 a through a gas nozzle 30. Oxidation of the hot water surface 1a can be suppressed by this inert gas.

そして、溶湯１の超音波振動により、溶湯１の内部に不活性ガスのマイクロバブル（微細気泡）２が発生する。超音波の振動数は、エネルギ効率の観点から、４〜８０ｋＨｚ程度が好ましい。超音波振動により発生するマイクロバブル２のサイズは、μｍオーダであって、溶湯の回転撹拌などにより発生するｍｍオーダの気泡に比べて小さい。そのため、介在物３に効率よく吸着することができる。マイクロバブル２は、溶湯１の内部の水素ガス（不図示）や浮遊している介在物３に吸着しながら浮上する。つまり、図２に示すように、マイクロバブル２が吸着した介在物３は、湯面１ａに浮上する。   Then, by the ultrasonic vibration of the molten metal 1, inert gas microbubbles (fine bubbles) 2 are generated inside the molten metal 1. The frequency of ultrasonic waves is preferably about 4 to 80 kHz from the viewpoint of energy efficiency. The size of the microbubbles 2 generated by the ultrasonic vibration is on the order of μm, which is smaller than the bubbles on the order of mm generated by rotating and stirring the molten metal. Therefore, it can adsorb | suck to the inclusion 3 efficiently. The microbubbles 2 float while adsorbing to hydrogen gas (not shown) inside the molten metal 1 and floating inclusions 3. That is, as shown in FIG. 2, the inclusion 3 to which the microbubbles 2 are adsorbed floats on the molten metal surface 1a.

ここで、図２に示すように、超音波振動子１１の端面１１ｂの位置が、湯面１ａよりも高くなっている。すなわち、超音波振動子１１の端面１１ｂと接触している溶湯１が、表面張力により湯面１ａから持ち上げられている。この表面張力により、湯面１ａに浮上した介在物３は超音波振動子１１の周囲に凝集し、介在物凝集体３ａが形成される。   Here, as shown in FIG. 2, the position of the end surface 11b of the ultrasonic transducer 11 is higher than the molten metal surface 1a. That is, the molten metal 1 that is in contact with the end surface 11b of the ultrasonic transducer 11 is lifted from the molten metal surface 1a by the surface tension. Due to this surface tension, the inclusions 3 floating on the molten metal surface 1a are aggregated around the ultrasonic vibrator 11 to form inclusion aggregates 3a.

このように、超音波振動子１１の端面１１ｂの位置を湯面１ａよりも高くすることにより、湯面１ａに浮上した介在物３を凝集させることができる。この凝集した介在物３すなわち介在物凝集体３ａは、容易に回収し、除去することができる。   Thus, by making the position of the end surface 11b of the ultrasonic transducer 11 higher than the molten metal surface 1a, the inclusions 3 floating on the molten metal surface 1a can be aggregated. The aggregated inclusions 3, that is, the inclusion aggregates 3a can be easily recovered and removed.

ここで、介在物３は、主にアルミニウム酸化物からなるため、介在物凝集体３ａを回収する代わりに、ＴＩＧ溶接装置などにより還元し、除去してもよい。介在物凝集体３ａを回収するよりも、溶湯１の歩留まりを向上させることができる。   Here, since the inclusion 3 is mainly made of aluminum oxide, it may be reduced and removed by a TIG welding apparatus or the like instead of collecting the inclusion aggregate 3a. The yield of the molten metal 1 can be improved rather than recovering the inclusion aggregate 3a.

超音波振動子１１の端面１１ｂと湯面１ａとの距離は、１〜５ｍｍにすることが好ましい。超音波振動子１１の端面１１ｂと湯面１ａとの距離が１ｍｍ未満では、湯面１ａに浮上した介在物３の凝集効果が充分に得られなくなる。超音波振動子１１の端面１１ｂと湯面１ａとの距離が５ｍｍを超えると、超音波振動子１１の端面１１ｂの周囲ではなく下に、介在物凝集体３ａが回り込み、超音波振動により再度溶湯１の内部に巻き込まれる虞がある。なお、超音波振動子１１の近傍の湯面１ａ上にフラックスを散布することにより、介在物３の除去効果を高めることができる。   The distance between the end surface 11b of the ultrasonic transducer 11 and the molten metal surface 1a is preferably 1 to 5 mm. If the distance between the end face 11b of the ultrasonic transducer 11 and the molten metal surface 1a is less than 1 mm, the effect of agglomeration of the inclusions 3 floating on the molten metal surface 1a cannot be obtained sufficiently. When the distance between the end surface 11b of the ultrasonic transducer 11 and the molten metal surface 1a exceeds 5 mm, the inclusion aggregate 3a wraps around the end surface 11b of the ultrasonic transducer 11 instead of around the end surface 11b, and melts again by ultrasonic vibration. There is a possibility of being caught in the inside of 1. In addition, the effect of removing the inclusions 3 can be enhanced by spreading the flux on the molten metal surface 1 a in the vicinity of the ultrasonic transducer 11.

ここで、図３は、超音波振動付与による介在物除去効果を示すグラフである。また、図４は、超音波振動付与による脱ガス効果を示すグラフである。具体的には、ＪＩＳ規格ＡＣ２Ｃアルミニウム合金２０ｋｇを７１０℃で溶解し、周波数４０ｋＨｚの超音波振動を３０秒間付与した。   Here, FIG. 3 is a graph showing the inclusion removal effect by applying ultrasonic vibration. FIG. 4 is a graph showing the degassing effect by applying ultrasonic vibration. Specifically, 20 kg of JIS standard AC2C aluminum alloy was melted at 710 ° C., and ultrasonic vibration with a frequency of 40 kHz was applied for 30 seconds.

図３の縦軸は、介在物量をＫ値で示している。図３に示すように、加振前に４０を超えていた介在物量は、３０秒間加振後に１０程度にまで低下した。図４の縦軸は、気孔率（％）を示している。図４に示すように、加振前に０．２５％を超えていた気孔率は、３０秒間加振後に略０％にまで低下した。なお、加振時間（超音波振動の付与時間）を３０秒よりも長くしても、Ｋ値及び気孔率は、ほとんど変化しなかった。図３、図４の結果から、加振時間は３０秒程度で充分であることが分かった。   The vertical axis | shaft of FIG. 3 has shown the amount of inclusion by K value. As shown in FIG. 3, the amount of inclusions that exceeded 40 before the vibration decreased to about 10 after the vibration for 30 seconds. The vertical axis | shaft of FIG. 4 has shown the porosity (%). As shown in FIG. 4, the porosity that exceeded 0.25% before the vibration decreased to approximately 0% after the vibration for 30 seconds. In addition, even if the excitation time (application time of ultrasonic vibration) was made longer than 30 seconds, the K value and the porosity were hardly changed. From the results shown in FIGS. 3 and 4, it was found that about 30 seconds was sufficient for the excitation time.

次に、図５を参照して、本発明の第１の実施の形態に係る介在物除去方法について説明する。図５は、本発明の第１の実施の形態に係る介在物除去方法を示すフローチャートである。
まず、超音波振動子１１の端面１１ｂを湯面１ａに近付ける（ステップＳＴ１）。 Next, the inclusion removal method according to the first embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flowchart showing the inclusion removal method according to the first embodiment of the present invention.
First, the end surface 11b of the ultrasonic transducer 11 is brought close to the molten metal surface 1a (step ST1).

次に、超音波振動子１１の端面１１ｂに溶湯１を接触させつつ、超音波振動を付与する（ステップＳＴ２）。ここで、超音波振動子１１の端面１１ｂの位置を、湯面１ａよりも高くする。具体的には、超音波振動子１１の端面１１ｂを湯面１ａに接触させた後、溶湯１への超音波振動を開始するとともに超音波振動子１１を引き上げる。ここで、超音波振動子１１を溶湯１に長時間浸漬させないため、超音波振動子１１の寿命を向上させることができる。   Next, ultrasonic vibration is applied while bringing the molten metal 1 into contact with the end face 11b of the ultrasonic transducer 11 (step ST2). Here, the position of the end surface 11b of the ultrasonic transducer 11 is set higher than the molten metal surface 1a. Specifically, after the end surface 11b of the ultrasonic vibrator 11 is brought into contact with the molten metal surface 1a, ultrasonic vibration to the molten metal 1 is started and the ultrasonic vibrator 11 is pulled up. Here, since the ultrasonic transducer | vibrator 11 is not immersed in the molten metal 1 for a long time, the lifetime of the ultrasonic transducer | vibrator 11 can be improved.

あるいは、超音波振動子１１の端面１１ｂを湯面１ａに接触させずに、溶湯１への超音波振動を開始した後、搖動した溶湯１を超音波振動子１１の端面１１ｂに接触させてもよい。この場合、超音波振動子１１に溶湯１が接触している時間がより短いため、超音波振動子１１の寿命をさらに向上させることができる。   Alternatively, after the ultrasonic vibration to the molten metal 1 is started without contacting the end surface 11b of the ultrasonic transducer 11 with the molten metal surface 1a, the perforated molten metal 1 may be brought into contact with the end surface 11b of the ultrasonic transducer 11. Good. In this case, since the molten metal 1 is in contact with the ultrasonic transducer 11 for a shorter time, the life of the ultrasonic transducer 11 can be further improved.

図２を参照して説明したように、溶湯１に超音波振動を付与することにより、溶湯１の内部に不活性ガスのマイクロバブル（微細気泡）２が発生する。マイクロバブル２は、溶湯１の内部の水素ガス（不図示）や浮遊している介在物３に吸着しながら浮上する。   As described with reference to FIG. 2, by applying ultrasonic vibration to the molten metal 1, inert gas microbubbles (fine bubbles) 2 are generated inside the molten metal 1. The microbubbles 2 float while adsorbing to hydrogen gas (not shown) inside the molten metal 1 and floating inclusions 3.

本実施の形態に係る介在物除去方法では、ステップＳＴ２において、超音波振動子１１の端面１１ｂの位置を、湯面１ａよりも高くしている。すなわち、超音波振動子１１の端面１１ｂと接触している溶湯１を、表面張力により湯面１ａから持ち上げている。この表面張力により、湯面１ａに浮上した介在物３を、超音波振動子１１の周囲に凝集させることができる。   In the inclusion removal method according to the present embodiment, in step ST2, the position of the end surface 11b of the ultrasonic transducer 11 is set higher than the molten metal surface 1a. That is, the molten metal 1 in contact with the end surface 11b of the ultrasonic transducer 11 is lifted from the molten metal surface 1a by the surface tension. Due to this surface tension, the inclusions 3 floating on the molten metal surface 1 a can be aggregated around the ultrasonic transducer 11.

最後に、湯面１ａに浮上し、凝集した介在物３すなわち介在物凝集体３ａを除去する（ステップＳＴ３）。
以上のステップにより、溶湯１の内部に浮遊する介在物３を除去することができる。 Finally, the inclusion 3 that floats on the molten metal surface 1a and aggregates, that is, the inclusion aggregate 3a is removed (step ST3).
Through the above steps, the inclusions 3 floating inside the molten metal 1 can be removed.

（第１の実施の形態の変形例）
次に、図６を参照して、本発明の第１の実施の形態の変形例について説明する。図６は、本発明の第１の実施の形態の変形例に係る介在物除去装置の模式的断面図である。
図１に示した介在物除去装置１０は、１槽構造の保持炉２０に適用されていた。これに対し、図６に示した介在物除去装置１０は、３槽構造の保持炉２０に適用されている。 (Modification of the first embodiment)
Next, a modification of the first embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic cross-sectional view of an inclusion removal apparatus according to a modification of the first embodiment of the present invention.
The inclusion removal apparatus 10 shown in FIG. 1 is applied to a holding furnace 20 having a single tank structure. On the other hand, the inclusion removal apparatus 10 shown in FIG. 6 is applied to a holding furnace 20 having a three-tank structure.

変形例に係る保持炉２０は、第１槽２１、第２槽２２、第３槽２３を備えている。ここで、第１槽２１と第２槽２２とは、連通孔２４ａにより互いに連通されている。また、第２槽２２と第３槽２３とは、連通孔２４ｂにより互いに連通されている。   The holding furnace 20 according to the modification includes a first tank 21, a second tank 22, and a third tank 23. Here, the 1st tank 21 and the 2nd tank 22 are mutually connected by the communication hole 24a. Moreover, the 2nd tank 22 and the 3rd tank 23 are mutually connected by the communication hole 24b.

第１槽２１には、介在物３を除去していない溶湯１が補充される。
第２槽２２に保持された溶湯１に対し、超音波振動子１１により超音波振動が付与され、介在物３が除去される。
そして、介在物３が除去された清浄な溶湯１が第３槽２３に保持される。第３槽２３に保持された清浄な溶湯１が、鋳造装置（不図示）に供給される。 The first tank 21 is replenished with the molten metal 1 from which the inclusions 3 have not been removed.
The ultrasonic vibration is applied to the molten metal 1 held in the second tank 22 by the ultrasonic vibrator 11, and the inclusion 3 is removed.
The clean molten metal 1 from which the inclusions 3 are removed is held in the third tank 23. The clean molten metal 1 held in the third tank 23 is supplied to a casting apparatus (not shown).

ここで、介在物除去装置１０の台座１８が第１槽２１上に固定されている。その他の介在物除去装置１０の構成は図１と同様であるため、説明を省略する。
図１と同様に、超音波振動子１１の端面１１ｂの位置を湯面１ａよりも高くすることにより、湯面１ａに浮上した介在物３を凝集させることができる。この凝集した介在物３すなわち介在物凝集体３ａは、容易に回収し、除去することができる。 Here, the base 18 of the inclusion removal apparatus 10 is fixed on the first tank 21. Since the structure of the other inclusion removal apparatus 10 is the same as that of FIG. 1, description is abbreviate | omitted.
As in FIG. 1, by making the position of the end surface 11b of the ultrasonic transducer 11 higher than the molten metal surface 1a, the inclusions 3 floating on the molten metal surface 1a can be aggregated. The aggregated inclusions 3, that is, the inclusion aggregates 3a can be easily recovered and removed.

なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。   Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

１ 溶湯
１ａ 湯面
２ マイクロバブル
３ 介在物
３ａ 介在物凝集体
１０ 介在物除去装置
１１ 超音波振動子
１１ａ セラミック部材
１１ｂ 端面
１２ 超音波発振器
１３ 支持アーム
１４ 昇降ガイド
１５ 昇降ロッド
１６ 振動アブソーバ
１７ 昇降シリンダ
１８ 台座
２０ 保持炉
２１ 第１槽
２２ 第２槽
２３ 第３槽
２４ａ、２４ｂ 連通孔
３０ ガスノズル DESCRIPTION OF SYMBOLS 1 Molten metal 1a Hot metal surface 2 Micro bubble 3 Inclusion body 3a Inclusion body aggregate 10 Inclusion removal apparatus 11 Ultrasonic vibrator 11a Ceramic member 11b End surface 12 Ultrasonic oscillator 13 Support arm 14 Lifting guide 15 Lifting rod 16 Vibrating absorber 17 Lifting cylinder 18 Pedestal 20 Holding furnace 21 First tank 22 Second tank 23 Third tank 24a, 24b Communication hole 30 Gas nozzle

Claims (2)

溶湯内の介在物を除去する介在物除去方法であって、
超音波振動子の端面を湯面に近付けるステップと、
前記超音波振動子の前記端面に前記溶湯を接触させつつ、超音波振動を付与するステップと、を備え、
前記超音波振動を付与するステップにおいて、
前記超音波振動子の前記端面を前記湯面に接触させずに、前記溶湯への前記超音波振動を開始した後、搖動した前記溶湯を前記超音波振動子の前記端面に接触させ、
前記超音波振動子の前記端面の位置を、前記湯面よりも高くする、
介在物除去方法。 An inclusion removal method for removing inclusions in the molten metal,
A step of bringing the end face of the ultrasonic transducer close to the surface of the molten metal;
Applying ultrasonic vibration while bringing the molten metal into contact with the end face of the ultrasonic vibrator, and
In applying the ultrasonic vibration,
Without starting the ultrasonic vibration to the molten metal without contacting the end surface of the ultrasonic vibrator to the molten metal surface, the peristated molten metal is brought into contact with the end surface of the ultrasonic vibrator,
The position of the end face of the ultrasonic transducer is higher than the hot water surface,
Inclusion removal method. 溶湯内の介在物を除去する介在物除去方法であって、
超音波振動子の端面を湯面に近付けるステップと、
前記超音波振動子の前記端面に前記溶湯を接触させつつ、超音波振動を付与するステップと、を備え、
前記超音波振動を付与するステップにおいて、
前記超音波振動子の前記端面を前記湯面に接触させた後、前記溶湯への前記超音波振動を開始するとともに前記超音波振動子を引き上げ、
前記超音波振動子の前記端面の位置を、前記湯面よりも高くする、
介在物除去方法。 An inclusion removal method for removing inclusions in the molten metal,
A step of bringing the end face of the ultrasonic transducer close to the surface of the molten metal;
Applying ultrasonic vibration while bringing the molten metal into contact with the end face of the ultrasonic vibrator, and
In applying the ultrasonic vibration,
After bringing the end face of the ultrasonic transducer into contact with the molten metal surface, the ultrasonic vibration to the molten metal is started and the ultrasonic transducer is pulled up,
The position of the end face of the ultrasonic transducer is higher than the hot water surface,
Inclusion removal method.
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