JP6967768B2 - Hot water discharge method for molten metal - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 178
- 229910052751 metal Inorganic materials 0.000 title claims description 148
- 239000002184 metal Substances 0.000 title claims description 148
- 238000000034 method Methods 0.000 title claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 97
- 238000003860 storage Methods 0.000 claims description 76
- 230000006698 induction Effects 0.000 claims description 66
- 230000005291 magnetic effect Effects 0.000 claims description 37
- 238000002844 melting Methods 0.000 claims description 19
- 230000008018 melting Effects 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 8
- 238000010791 quenching Methods 0.000 description 34
- 230000000171 quenching effect Effects 0.000 description 33
- 229910045601 alloy Inorganic materials 0.000 description 32
- 239000000956 alloy Substances 0.000 description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 230000004907 flux Effects 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 9
- 239000000843 powder Substances 0.000 description 9
- 230000005674 electromagnetic induction Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002114 nanocomposite Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- 229910001172 neodymium magnet Inorganic materials 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000009689 gas atomisation Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 239000002159 nanocrystal Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000009692 water atomization Methods 0.000 description 3
- 229910008423 Si—B Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
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- 238000002425 crystallisation Methods 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
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Description
本発明は、溶融金属の出湯方法に関する。 The present invention relates to a method for discharging molten metal.
近年、ナノメートルオーダのサイズを有する微細なNd-Fe-B、Sm-Fe-Nなどの硬磁性相とFe-Bやα-Feなどの軟磁性相とが同一金属組織内に存在するナノコンポジット型永久磁石（以下、「ナノコンポジット磁石」と称する）が提案されている。このナノコンポジット型永久磁石は、ナノメートルオーダの結晶粒であるが故に静磁気相互作用に加え、交換相互作用により各結晶粒が磁気的に結合して、優れた磁石特性を発現することがマイクロマグネティクスを応用した計算機シミュレーション等にて明らかにされ、次世代の高性能永久磁石材料として注目されている。 In recent years, fine hard magnetic phases such as Nd-Fe-B and Sm-Fe-N having a nanometer-order size and soft magnetic phases such as Fe-B and α-Fe exist in the same metal structure. Composite permanent magnets (hereinafter referred to as "nanocomposite magnets") have been proposed. Since this nanocomposite type permanent magnet is a crystal grain on the order of nanometers, in addition to the static magnetic interaction, each crystal grain is magnetically bonded by the exchange interaction to exhibit excellent magnet characteristics. It has been clarified by computer simulations that apply magnetics, and is attracting attention as a next-generation high-performance permanent magnet material.
DC小型モータや各種センサなどの電子工業製品分野では、残留磁束密度Brの高い磁石が要求されている。この要求に応じてナノコンポジット磁石の残留磁束密度を向上させるには、ナノコンポジット磁石に含まれる2.2Tと高い飽和磁化Jsを有するα-Fe相の存在比率を高めることが有効である。Nd2Fe14B相の飽和磁化Jsが1.6TであることからNd2Fe14B単相で磁石が構成された場合よりも、α-Feが同一組織内に混在している方が高い磁化が期待される。そのため製造方法としては一般的に単ロール急冷法にて体積比率で40%以上のアモルファス組織を有する溶湯急冷凝固合金を作製した後、本急冷凝固合金に結晶化熱処理を施す工程にてNd2Fe14B相とα-Fe相が同一組織内に混在している前記のナノコンポジット磁石が作製されている。 In the field of electronic industrial products such as small DC motors and various sensors, magnets with a high residual magnetic flux density Br are required. In order to improve the residual magnetic flux density of the nanocomposite magnet in response to this requirement, it is effective to increase the abundance ratio of the α-Fe phase having 2.2T and high saturation magnetization Js contained in the nanocomposite magnet. Since the saturation magnetization Js of the Nd2Fe14B phase is 1.6T, higher magnetization is expected when α-Fe is mixed in the same structure than when the magnet is composed of the Nd2Fe14B single phase. Therefore, as a manufacturing method, generally, a molten metal quenching solidification alloy having an amorphous structure with a volume ratio of 40% or more is produced by a single roll quenching method, and then the quenching heat treatment is applied to the quenching solidifying alloy to obtain the Nd2Fe14B phase. The nanocomposite magnet in which the α-Fe phase is mixed in the same structure has been produced.
等方性鉄基希土類系ナノコンポジット磁石合金においては、Nd2Fe14B相とα-Fe相あるいはFe-B相が同一金属組織内にナノメータオーダーの結晶粒径で混在していることで各結晶粒間に働く交換相互作用によりあたかも一体の磁石の様に振る舞うことが特徴として挙げられる。 In isotropic iron-based rare earth-based nanocomposite magnet alloys, Nd2Fe14B phase and α-Fe phase or Fe-B phase are mixed in the same metal structure with a crystal grain size on the order of nanometers, so that between each crystal grain. One of the characteristics is that it behaves like an integral magnet due to the working exchange interaction.
加えて、電子部品として使用されるインダクタやリアクトルといった各種受動素子やトランス向けに鉄損が低く飽和磁束密度Bsが高い材料が市場から求められており、透磁率が高く、鉄損が低い軟磁性材料として鉄基アモルファス材料や、同じく鉄基のナノ結晶材料といった鉄（Fe）、硼素（B）、ケイ素（Si）を主原料とするガスアトマイズ粉（平均粒径50μm程度）、水アトマイズ粉（平均粉末粒径20μm以下程度）、並びに単ロール急冷法で作製された溶湯急冷合金薄帯を粉砕した平均粉末粒径70μm程度の急冷合金粉等を用いた形状自由度に優れる圧粉磁心が従来のケイ素鋼板を用いた積み鉄心に代わる高性能高効率軟磁性材料として各種の受動素子等に使用され需要が年々拡大している。 In addition, the market demands materials with low iron loss and high saturation magnetic flux density Bs for various passive elements such as inductors and reactors used as electronic components and transformers, and soft magnetism with high magnetic permeability and low iron loss. Gas atomized powder (average particle size of about 50 μm) and water atomized powder (average particle size 50 μm) mainly made of iron (Fe), boron (B), silicon (Si), such as iron-based amorphous materials and iron-based nanocrystalline materials, as materials. (Powder particle size of about 20 μm or less), and a compact magnetic core with excellent shape freedom using a quenching alloy powder with an average powder particle size of about 70 μm obtained by crushing a molten metal quenching alloy strip produced by the single roll quenching method is conventional. It is used in various passive elements as a high-performance, high-efficiency soft magnetic material that replaces the stacked iron core using silicon steel plate, and its demand is increasing year by year.
特許文献１では、液体急冷装置を用いた鋳型液体急冷法により、アモルファス合金のバルク材を作製する際において、鋳巣欠陥の発生を防止することが可能な融解金属噴射ノズルを提供することを目的に先端にノズル穴を有する石英管ノズル内に納めた母合金の背後に、石英管ノズル内を摺動可能なピストンを設ける。ピストンは、母合金側とは反対側の背後を不活性ガスで加圧することにより母合金側へと摺動し、液体状態の母合金を石英管ノズル先端のノズル穴から噴射する。母合金を噴射した後には、ピストンがノズル穴を遮蔽し、不活性ガスのノズル穴からの噴出を防止する方法が提案されているが、ノズルから安定した出湯（噴出）レートで溶湯を出湯（噴出）する技術は示されていない。
特許文献２では、液体急冷法によって作製する磁石粉末において、安定した寸法のリボン状磁石を作製することによって、安定した磁気特性の磁石粉末を得ることを目的とし、溶湯を急冷のための回転するロール、溶融磁石合金を吐出させるオリフィスを有する容器、加熱装置を備えた液体急冷法において、高周波加熱の交流磁界によって内向きの電磁気力が生じることによる中心部の流れ方向をオリフィスから噴射する方向と一致させることにより、溶融磁石合金の噴射が安定することを特徴とする。又、溶融磁石合金の温度分布から生じる対流が噴射を妨げないように高周波コイルの加熱分布を決めることがクレームされているが、量産レベル例えば数時間以上、一定の安定した溶湯出湯（噴出）レートを維持しながら安定して溶湯をノズルから出湯（噴出）する技術方法については何ら示していない。 In Patent Document 2, in the magnet powder produced by the liquid quenching method, the molten metal is rotated for quenching for the purpose of obtaining a magnet powder having stable magnetic characteristics by producing a ribbon-shaped magnet having stable dimensions. In the liquid quenching method equipped with a roll, a container having an orifice for discharging a molten magnet alloy, and a heating device, the flow direction of the central part due to the inward electromagnetic force generated by the AC magnetic field of high frequency heating is jetted from the orifice. It is characterized in that the injection of the molten magnet alloy is stabilized by matching. It is also claimed that the heating distribution of the high frequency coil is determined so that the convection generated from the temperature distribution of the molten magnet alloy does not interfere with the injection. Nothing is shown about the technical method of stably discharging (spouting) the molten metal from the nozzle while maintaining the above.
また、特許文献３では、 回転ロールを用いた急冷・凝固によるボンド磁石用永久磁石合金粉末を連続的に製造して安価に提供できる製造方法及びその装置に関する出願において、溶解炉にて溶解した溶湯を急冷薄帯化する前に、出湯温度に保温された貯湯容器に溶湯を貯湯し、貯湯容器内の溶湯を急冷薄帯にする時、溶解炉にて配合原料を連続的に溶解し、貯湯装置内の減少した溶湯に追加補充し、追加補充した溶湯を連続して水冷ロールにて急冷薄帯化し、溶湯レベルを検出器にて検出した信号により貯湯容器内の出湯ノズルのオリフィス部に働く溶湯のヘッド圧の変化に対応して、急冷槽の圧力を調整することにより、溶解槽と急冷槽の槽間圧力差と貯湯容器内の溶湯のヘッド圧からなる出湯圧力に依存する出湯量を一定に保持して、急冷薄帯の品質を均一に保持することが記載されているが、本方法では溶湯の融点以上に保持される出湯ノズル周囲からのリークを防ぐことは極めて難しく、溶解槽と急冷槽間における差圧は溶湯のヘッド圧の変化に加えて、溶解槽と急冷槽間のノズル周囲からのリーク量を踏まえた差圧制御が必要となり、実用化には溶湯ヘッド圧の変化に加え溶解槽内圧力、急冷槽内圧力の変化をモニタリングしながら出湯レートを制御することが必要となるため、システム構築には多額の装置費用が必要となるだけでなく、安定生産に必要な操業パラメータが多く、工程費用の増加要因となる。
Further, in
鉄基溶湯急冷凝固合金の結晶化熱処理に係り、最適な熱処理条件で結晶化することにより、50nm以下の均一ナノ結晶組織にすることでRE-Fe-B系合金であれば高磁束密度、高保磁力に加えて減磁極性の角形性に優れた良好なナノ結晶型永久磁石特性が得られ、Fe-Si-B系の軟磁性材料では高透磁率と高飽和磁束密度を両立可能な優れたナノ結晶軟磁性材料が得られることから各種の高性能DCブラシレスモータや磁気センタおよび各種受動素子等々向けに均一微細なナノ結晶組織を有する鉄基磁性材料が電子部品市場より強く望まれている。 It is involved in the crystallization heat treatment of the iron-based molten metal quenching solidification alloy, and by crystallizing under the optimum heat treatment conditions, a uniform nanocrystal structure of 50 nm or less is obtained, and if it is a RE-Fe-B based alloy, it has a high magnetic flux density and high maintenance. In addition to magnetic force, good nanocrystalline permanent magnet characteristics with excellent magnetic field reduction and squareness can be obtained, and Fe-Si-B-based soft magnetic materials are excellent in achieving both high magnetic permeability and high saturation magnetic flux density. Since nanocrystal soft magnetic materials can be obtained, iron-based magnetic materials having a uniform and fine nanocrystal structure for various high-performance DC brushless motors, magnetic centers, various passive elements, etc. are strongly desired from the electronic component market.
ガスアトマイズ法、水アトマイズ法、単ロール溶湯急冷法並びにこれら溶湯急冷方法を組み合せた溶湯装置においては、何れも金属を溶融し、溶湯状態にした後、ノズル先端の設けたオリフィスあるいはスリットから溶湯を出湯する技術は共通であり、出湯後、ガスあるいは水で溶湯が急冷される方法がアトマイズ法であり、回転する金属ロール上に溶湯を出湯し急冷する方法が単ロール溶湯急冷方法と呼ばれている。つまり、種々の冷却媒体により溶湯の熱量を短時間で奪い急冷することが種々の溶湯急冷凝固法では最も重要であり、均一な溶湯急冷状態を維持するめには、溶湯による入熱量を安定化した上、冷却媒体の抜熱量を一定に保持し、入熱量と抜熱量のバランスを常に一定状態に維持することが重要となるが、抜熱量の一定維持は冷却ロールの熱容量並びにロール冷却水の温度並びに流量制御、アトマイズ時の噴霧水量等の調整により工業的に実施することは比較的容易であるものの入熱量、つまり出湯レート（単位時間当たりの出湯重量）と溶湯温度の維持を工業的に安価な方法で容易に実現することは極めて難しい。 In the molten metal method that combines the gas atomizing method, water atomizing method, single-roll molten metal quenching method, and these molten metal quenching methods, the metal is melted to make it into a molten metal state, and then the molten metal is discharged from the orifice or slit provided at the tip of the nozzle. The technology to be used is common. The method of quenching the molten metal with gas or water after the hot water is discharged is called the atomizing method, and the method of discharging the molten metal on a rotating metal roll and quenching it is called the single roll molten metal quenching method. .. In other words, it is most important in various molten metal quenching and coagulation methods to take away the heat of the molten metal in a short time by various cooling media and quench it, and in order to maintain a uniform molten metal quenching state, the amount of heat input by the molten metal was stabilized. In addition, it is important to keep the amount of heat removed from the cooling medium constant and to maintain the balance between the amount of heat input and the amount of heat removed at all times. In addition, although it is relatively easy to carry out industrially by controlling the flow rate and adjusting the amount of sprayed water at the time of atomization, it is industrially inexpensive to maintain the amount of heat input, that is, the hot water discharge rate (water discharge weight per unit time) and the molten metal temperature. It is extremely difficult to realize it easily by any method.
金属を溶かし溶融金属を得る方法としては抵抗加熱方式と誘導加熱方式があるが抵抗加熱は金属回りの雰囲気を別の熱源（例えば燃焼ガス、電気ヒータ等）で加熱することで、金属の温度を融点以上にして溶融させるため、金属は静的な状態で溶けていく。一方、誘導加熱は金属に数kHz〜数10kHz高周波磁場を加えることで金属の表面に渦電流を生じさせ、これによって金属が抵抗加熱により加熱される原理を応用し金属を溶かす。高周波誘導加熱炉では、コイルの内側に坩堝を配し、そこに金属を入れて抵抗加熱により金属を溶かすが、溶融金属の周りのコイルに流れる高周波電流により磁場（B）が発生し、その磁場により溶融金属には渦電流(J )が円周方向に流れ、磁場(B)と渦電流（J）にて生じる「フレミングの左手の法則」により、坩堝の中心方向へピンチ力(F)が生まれ、このピンチ力（F）により溶融金属に流れが生じ坩堝内で金属が撹拌されるため溶融金属は動的な状態になる。 There are resistance heating method and induction heating method as a method of melting metal to obtain molten metal, but resistance heating raises the temperature of metal by heating the atmosphere around the metal with another heat source (for example, combustion gas, electric heater, etc.). The metal melts in a static state because it melts above the melting point. On the other hand, induction heating creates an eddy current on the surface of the metal by applying a high-frequency magnetic field of several kHz to several tens of kHz to the metal, thereby melting the metal by applying the principle that the metal is heated by resistance heating. In a high-frequency induction heating furnace, a pit is placed inside the coil, and metal is put in it to melt the metal by resistance heating. However, a magnetic field (B) is generated by the high-frequency current flowing in the coil around the molten metal, and the magnetic field is generated. As a result, a vortex current (J) flows in the molten metal in the circumferential direction, and a pinch force (F) is generated toward the center of the pit by the "Fleming's left-hand rule" generated by the magnetic field (B) and the vortex current (J). This pinch force (F) causes a flow in the molten metal and the metal is agitated in the pit, so that the molten metal is in a dynamic state.
溶融金属をオリフィスを施した出湯ノズルから安定した出湯レートで出湯するためには、底部に出湯ノズルを配した貯湯容器（タンディシュ）内の溶湯重量をノズルから出湯が可能な溶湯噴射圧が得られる溶湯ヘッド圧になるよう溶湯重量を一定範囲に保持する、あるいは貯湯容器内を加圧し、溶湯噴射圧を確保する必要があるが、ノズルから溶湯出湯が可能な噴射圧10kPa以上を確保するのは内径250mmの貯湯容器の場合では溶湯ヘッド圧のみで出湯を継続するには溶湯重量50kg程度に維持する必要があり、50kgを下回ると貯湯容器内を加圧しない場合は、ノズルからの出湯が停止し、貯湯容器内の溶融金属を完全出湯できない。加えて貯湯容器内の溶湯が高周波磁場により電磁撹拌していると溶湯ヘッド圧に変化を及ぼすため、溶融金属が静的な状態で保持される抵抗加熱方式による貯湯容器の加熱が一般的に採用されているが、本方式では貯湯容器内で金属を溶解するには長時間を要するため、別に金属溶解用の高周波誘導加熱炉を用意し、本溶解炉で金属を溶かした後、貯湯容器内へ溶融金属を注ぎ、この注ぎ込む溶湯重量を調整することで貯湯容器内の溶湯ヘッド圧を一定の範囲、例えば、溶湯ヘッド圧が10kPa〜20kPaとなる範囲に維持する方式が採用されているものの、溶解量が少ないと注ぎ込む溶融金属の温度が変化し、溶湯粘性に影響することから前記高周波誘導加熱炉は、10ton〜40tonと非常に大きな溶解サイズとなり装置全体のコストアップ要因となっている。 In order to discharge molten metal from a hot water nozzle with an orifice at a stable hot water rate, it is possible to obtain a molten metal injection pressure that allows the weight of the molten metal in the hot water storage container (Tandish) with the hot water nozzle arranged at the bottom to be discharged from the nozzle. It is necessary to keep the molten metal weight within a certain range so that the molten metal head pressure is reached, or pressurize the inside of the hot water storage container to secure the molten metal injection pressure. In the case of a hot water storage container with an inner diameter of 250 mm, it is necessary to maintain the molten metal weight at about 50 kg in order to continue hot water discharge only with the molten metal head pressure. However, the molten metal in the hot water storage container cannot be completely discharged. In addition, if the molten metal in the hot water storage container is electromagnetically stirred by a high-frequency magnetic field, the molten metal head pressure will change, so heating of the hot water storage container by a resistance heating method in which the molten metal is held in a static state is generally adopted. However, in this method, it takes a long time to melt the metal in the hot water storage container, so a separate high-frequency induction heating furnace for melting the metal is prepared separately, and after melting the metal in the main melting furnace, the inside of the hot water storage container. Although a method is adopted in which the molten metal is poured into the molten metal and the weight of the molten metal to be poured is adjusted to maintain the molten metal head pressure in the hot water storage container within a certain range, for example, the molten metal head pressure is within a range of 10 kPa to 20 kPa. If the amount of melting is small, the temperature of the molten metal to be poured changes, which affects the viscosity of the molten metal. Therefore, the high-frequency induction heating furnace has a very large melting size of 10 tons to 40 tons, which is a factor of increasing the cost of the entire apparatus.
また、出湯ノズル先端回りは断熱できないだけでなく、配下に設置されている急冷ロールの巻込み風により常に冷却される状態になるため、ノズル周りには先端を除き、SiC等のヒータ材を仕込んだ上、断熱材でヒータ材を覆った上、ノズルを溶融金属の凝固温度以上に保持し、溶湯凝固によるノズル閉塞を防ぐ対策が取られているが、ノズル周りのセットアップ作業が多くなるだけでなく、融点が高い金属の場合は、ヒータ材への負荷が大きくなりヒータの断線により出湯が停止する等のトラブルも発生し易くなり、工程費用の増加要因となっている。 In addition, not only is it impossible to insulate the area around the tip of the hot water nozzle, but it is always cooled by the entrainment wind of the quenching roll installed under it. In addition, measures have been taken to cover the heater material with a heat insulating material and keep the nozzle above the solidification temperature of the molten metal to prevent nozzle blockage due to molten metal solidification, but this only increases the setup work around the nozzle. However, in the case of a metal having a high melting point, the load on the heater material becomes large, and troubles such as the hot water being stopped due to the disconnection of the heater are likely to occur, which is a factor of increasing the process cost.
そこで、本発明は、溶融金属を安定した出湯レートで出湯可能な溶融金属の出湯方法の提供を目的とする。 Therefore, an object of the present invention is to provide a hot water discharge method for molten metal, which can discharge molten metal at a stable hot water discharge rate.
本発明の前記目的は、貯湯容器に収容した金属を加熱により溶融させて、前記貯湯容器の底部から下方に延びる出湯ノズルの先端から噴出させる溶融金属の出湯方法であって、前記貯湯容器および出湯ノズルは、それぞれの周囲に、貯湯容器用高周波誘導加熱コイルおよび出湯ノズル用高周波誘導加熱コイルが設けられており、前記貯湯容器用高周波誘導加熱コイルの外径に対して、前記出湯ノズル用高周波誘導加熱コイルの外径を１／２以下に設定し、前記貯湯容器用高周波誘導加熱コイルと前記出湯ノズル用高周波誘導加熱コイルとの間に生じる間隔が、−５０ｍｍ以上＋１００ｍｍ以下であり、前記貯湯容器用高周波誘導加熱コイルが生成する高周波磁場の周波数に対して、前記出湯ノズル用高周波誘導加熱コイルが生成する高周波磁場の周波数を、３倍以上６０倍以下に設定し、前記出湯ノズルは、オリフィスを有する先端部が着脱可能とされており、前記貯湯容器用高周波誘導加熱コイルおよび出湯ノズル用高周波誘導加熱コイルの作動により、前記貯湯容器から前記出湯ノズルに向けた溶融金属の流れを生じさせ、溶湯ヘッド圧の変化に因らず一定範囲の出湯レートを維持しながら出湯する溶融金属の出湯方法により達成される。
The object of the present invention is a method for discharging molten metal by heating and melting the metal contained in the hot water storage container and ejecting it from the tip of a hot water discharge nozzle extending downward from the bottom of the hot water storage container. A high-frequency induction heating coil for a hot water storage container and a high-frequency induction heating coil for a hot water nozzle are provided around each of the nozzles, and the high-frequency induction for the hot water nozzle is provided with respect to the outer diameter of the high-frequency induction heating coil for the hot water storage container. The outer diameter of the heating coil is set to 1/2 or less, and the distance generated between the high frequency induction heating coil for the hot water storage container and the high frequency induction heating coil for the hot water nozzle is -50 mm or more and + 100 mm or less, and the hot water storage container. The frequency of the high-frequency magnetic field generated by the high-frequency induction heating coil for the hot water nozzle is set to 3 times or more and 60 times or less with respect to the frequency of the high-frequency magnetic field generated by the high-frequency induction heating coil. The tip is removable, and the operation of the high-frequency induction heating coil for the hot water storage container and the high-frequency induction heating coil for the hot water nozzle causes a flow of molten metal from the hot water storage container to the hot water nozzle to generate molten metal. This is achieved by a hot water discharge method for molten metal, which discharges hot water while maintaining a hot water discharge rate within a certain range regardless of changes in head pressure.
本発明によれば、溶融金属を安定した出湯レートで出湯可能な溶融金属の出湯方法を提供することができる。すなわち、貯湯容器用高周波誘導加熱コイルおよび出湯ノズル用高周波誘導加熱コイルによる金属の誘導加熱が可能になると共に、それぞれのコイルが貯湯容器内の溶融金属に与える電磁誘導が、貯留容器内の溶融金属の重量変化に合わせて変化する。したがって、出湯ノズルからの溶湯の噴出が、溶融金属の残量に拘らず、出湯ノズルから溶湯が噴出し切る直前まで一定の噴出力を維持したまま継続するため、出湯ノズルの開口面積に応じた一定範囲内の出湯レートで溶湯を噴出させることが可能になる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a method for discharging molten metal so that the molten metal can be discharged at a stable hot water rate. That is, the metal induction heating by the high frequency induction heating coil for the hot water storage container and the high frequency induction heating coil for the hot water nozzle becomes possible, and the electromagnetic induction given to the molten metal in the hot water storage container by each coil is the molten metal in the storage container. It changes according to the weight change of. Therefore, regardless of the remaining amount of molten metal, the ejection of molten metal from the hot water nozzle continues while maintaining a constant ejection output until just before the molten metal is completely ejected from the hot water nozzle, so that it is constant according to the opening area of the hot water nozzle. It is possible to eject molten metal at a hot water discharge rate within the range.
従来の単ロール溶湯急冷装置、水およびガスアトマイズ装置等の各種の溶湯急冷装置における出湯ノズルからの溶湯噴出は、貯湯容器内の溶湯重量変化（溶湯ヘッド圧の変化）を出湯ノズルのオリフィスから溶湯噴出が可能な溶湯ヘッド圧の範囲内に維持するよう貯湯容器内の溶湯重量を一定範囲内に維持する、あるいは貯湯容器内を溶湯噴出が可能な圧力で加圧する方法の何れかしかなかったが、貯湯容器（タンデッシュ）用高周波誘導加熱コイルに加え、出湯ノズル加熱用高周波誘導加熱コイルを配置した二連式高周波誘導加熱方式を採用し、夫々のコイルの大きさ、配置並びに高周波磁場の周波数比率を最適化することで、夫々のコイルにて発生する磁束が互いに干渉することなく、誘導加熱が可能になると共に、貯湯容器からノズル先端にかけて貯湯容器用高周波誘導加熱コイルとノズル用高周波誘導加熱コイルにて発生する電磁誘導により、溶融金属の流れ（ダウンストリーム）を貯湯容器から出湯ノズルにかけて発生すると共に貯湯容器内の溶融金属に与える電磁誘導は、貯湯容器内の溶融金属重量の変化に合わせて変化するため、結果的に前記ダウンストリームは一定の噴出力を維持したまま貯湯容器内の溶湯が全て無くなるまで継続し、ノズルオリフィスの開口面積による溶湯出湯量を調整することによって、出湯ノズルから溶湯が噴出し切る直前まで、貯湯容器内の溶融金属重量に因らず一定範囲内の出湯レートを維持することが可能になることを見出し本発明の完成に至った。 The molten metal ejection from the hot water nozzle in various molten metal quenching devices such as the conventional single-roll molten metal quenching device, water and gas atomizing device causes the change in the molten metal weight (change in the molten metal head pressure) in the hot water storage container to be ejected from the orifice of the hot water nozzle. There was only one method of keeping the weight of the molten metal in the hot water storage container within a certain range so as to keep it within the range of the possible molten metal head pressure, or pressurizing the inside of the hot water storage container with a pressure that allows the molten metal to be ejected. In addition to the high-frequency induction heating coil for the hot water storage container (tandesh), a dual high-frequency induction heating method in which a high-frequency induction heating coil for heating the hot water nozzle is arranged is adopted, and the size and arrangement of each coil and the frequency ratio of the high-frequency magnetic field are adjusted. By optimizing, induction heating becomes possible without the magnetic flux generated in each coil interfering with each other, and from the hot water storage container to the tip of the nozzle, the high-frequency induction heating coil for the hot water storage container and the high-frequency induction heating coil for the nozzle can be used. The electromagnetic induction generated by the electromagnetic induction causes the flow of molten metal (downstream) from the hot water storage container to the hot water nozzle, and the electromagnetic induction given to the molten metal in the hot water storage container changes according to the change in the weight of the molten metal in the hot water storage container. Therefore, as a result, the downstream continues until all the molten metal in the hot water storage container is exhausted while maintaining a constant jet output, and by adjusting the amount of molten metal discharged by the opening area of the nozzle orifice, the molten metal is discharged from the hot water nozzle. The present invention has been completed by finding that it is possible to maintain a hot water discharge rate within a certain range regardless of the weight of the molten metal in the hot water storage container until just before the injection is completed.
本発明による溶融金属の出湯方法では、貯湯容器用高周波誘導加熱コイルに加え、貯湯容器の底部の出湯ノズルに、貯湯容器加熱用高周波誘導加熱コイルの外径（外郭直径）に対して1/2以下の外径（外郭直径）を有する出湯ノズル加熱用高周波誘導加熱コイルを配置した二連式高周波誘導加熱方式を採用する。貯湯容器加熱用高周波誘導加熱コイルと出湯ノズル加熱用高周波誘導加熱コイルとの間に生じる間隔が-50mm以上+100mm以下になるよう、それぞれのコイルを配することが好ましく、こうして貯湯容器用高周波誘導加熱コイルと出湯ノズル用高周波誘導加熱コイルの配置を最適な状態とした上、それぞれの高周波磁場の周波数比率を3倍以上60倍以下にすることが好ましい。 In the method for discharging molten metal according to the present invention, in addition to the high-frequency induction heating coil for the hot water storage container, the hot water discharge nozzle at the bottom of the hot water storage container is halved with respect to the outer diameter (outer diameter) of the high-frequency induction heating coil for heating the hot water storage container. A dual high-frequency induction heating method is adopted in which a high-frequency induction heating coil for heating the hot water nozzle having the following outer diameter (outer diameter) is arranged. It is preferable to arrange each coil so that the distance generated between the high frequency induction heating coil for heating the hot water storage container and the high frequency induction heating coil for heating the hot water nozzle is -50 mm or more and + 100 mm or less, and thus the high frequency induction for the hot water storage container. It is preferable that the arrangement of the heating coil and the high frequency induction heating coil for the hot water nozzle is optimized, and the frequency ratio of each high frequency magnetic field is 3 times or more and 60 times or less.
以下に本発明の好ましい実施形態を説明する。 Hereinafter, preferred embodiments of the present invention will be described.
[誘導加熱コイル構成]
本発明による溶融金属出湯方法は、貯湯容器の周囲に貯湯容器用高周波誘導加熱コイルを備え、貯湯容器底部の出湯ノズルの周囲に設けた出湯ノズル用高周波誘導加熱コイルを備えて、これらの作動による二連式高周波誘導加熱により、貯湯容器からノズル先端にかけて電磁誘導による溶融金属のダウンストリームを起こすことにより、溶湯ヘッド圧の変化に因らず一定範囲の出湯レートを維持しながら出湯する方法である。
[Induction heating coil configuration]
The molten metal hot water discharge method according to the present invention is provided with a high frequency induction heating coil for a hot water storage container around the hot water storage container, and a high frequency induction heating coil for a hot water discharge nozzle provided around the hot water discharge nozzle at the bottom of the hot water storage container. It is a method to discharge hot water while maintaining a hot water discharge rate within a certain range regardless of the change in the molten metal head pressure by causing the molten metal downstream by electromagnetic induction from the hot water storage container to the tip of the nozzle by double high frequency induction heating. ..
[誘導加熱コイルの配置]
本発明の好ましい実施形態では、貯湯容器加熱用高周波誘導加熱コイルと出湯ノズル加熱用高周波誘導加熱コイルとの間隔（図１の符号Ｓ）を-50mm以上+100mm以下とすることが好ましい。なお、間隔Ｓがマイナスの場合は、貯湯容器加熱用高周波誘導加熱コイルと出湯ノズル加熱用高周波誘導加熱コイルとが、側面視においてオーバーラップしている状態である。-50mm以下の場合、互いのコイルにより発生する磁束が干渉し効率的に誘導加熱できない。また、+100mm以上では出湯ノズル部で溶融金属の温度低下が発生する。より好ましくは-40mm以上+80mm以下であり、さらに好ましくは-30mm以上+70mm以下である。
[Arrangement of induction heating coil]
In a preferred embodiment of the present invention, the distance between the high frequency induction heating coil for heating the hot water storage container and the high frequency induction heating coil for heating the hot water nozzle (reference numeral S in FIG. 1) is preferably -50 mm or more and +100 mm or less. When the interval S is negative, the high-frequency induction heating coil for heating the hot water storage container and the high-frequency induction heating coil for heating the hot water nozzle overlap each other in the side view. If it is -50 mm or less, the magnetic flux generated by each other's coils interferes and induction heating cannot be performed efficiently. In addition, when the temperature is +100 mm or more, the temperature of the molten metal drops at the hot water nozzle. It is more preferably -40 mm or more and +80 mm or less, and further preferably -30 mm or more and +70 mm or less.
［高周波磁場周波数比率］
貯湯容器加熱用高周波誘導コイルが生成する高周波磁場の周波数に対して、出湯ノズル加熱用高周波誘導コイルが生成する高周波磁場の周波数が、3倍未満の場合、互いのコイルにより発生する磁束が干渉し効率的に誘導加熱できず、60倍を超える場合は、電磁誘導による溶融金属の撹拌が小さくなるため前記の溶融金属によるダウンストリームが抑制されることから、3倍以上60倍以下にすることが好ましい。より好ましくは3倍以上50倍以下であり、さらに好ましくは4倍以上40倍以下である。
[High frequency magnetic field frequency ratio]
If the frequency of the high-frequency magnetic field generated by the high-frequency induction coil for heating the hot water nozzle is less than 3 times the frequency of the high-frequency magnetic field generated by the high-frequency induction coil for heating the hot water storage container, the magnetic fluxes generated by the coils interfere with each other. If the induction heating cannot be performed efficiently and exceeds 60 times, the stirring of the molten metal by electromagnetic induction becomes smaller and the downstream due to the molten metal is suppressed. preferable. It is more preferably 3 times or more and 50 times or less, and further preferably 4 times or more and 40 times or less.
［誘導加熱コイルの外径比率］
本発明の好ましい実施形態では、貯湯容器加熱用高周波誘導加熱コイルの外径（図１の符号Ｄ１）に対して、出湯ノズル加熱用高周波誘導加熱コイルの外径（図１の符号Ｄ２）を、1/2以下にすることが好ましい。この比率が1/2より大きいと、互いのコイルにより発生する磁束が干渉し効率的に誘導加熱できない。この比率は、より好ましくは、3/7以下であり、さらに好ましくは2/5以下である。この比率の下限は特に存在しないが、実用的には、例えば1/10以上である。
[Outer diameter ratio of induction heating coil]
In a preferred embodiment of the present invention, the outer diameter of the high frequency induction heating coil for heating the hot water nozzle (reference numeral D2 in FIG. 1) is set with respect to the outer diameter of the high frequency induction heating coil for heating the hot water storage container (reference numeral D1 in FIG. 1). It is preferably 1/2 or less. If this ratio is larger than 1/2, the magnetic fluxes generated by the coils interfere with each other and efficient induction heating cannot be performed. This ratio is more preferably 3/7 or less, still more preferably 2/5 or less. There is no particular lower limit for this ratio, but in practice it is, for example, 1/10 or more.
[分割式出湯ノズル]
本発明の好ましい実施形態では、貯湯容器底部に配置した出湯ノズルのオリフィスを有する先端部を着脱可能な構成として、溶融金属をノズルから出湯完了後、出湯ノズルの先端部のみを新品に交換し、貯湯容器および出湯ノズルの先端部以外は交換せずに、溶融金属の出湯を再開する。オリフィスには、先端部にスリット加工を施したものも含まれる。
[Split hot water nozzle]
In a preferred embodiment of the present invention, the tip having the orifice of the hot water nozzle arranged at the bottom of the hot water storage container is detachable, and after the molten metal is discharged from the nozzle, only the tip of the hot water nozzle is replaced with a new one. Resume hot water from molten metal without replacing anything other than the tip of the hot water storage container and hot water nozzle. Orifices include those having a slit at the tip.
以下、本発明の実施例を説明する。 Hereinafter, examples of the present invention will be described.
（実施例）
外郭直径400mm高さ650mmである貯湯容器加熱用高周波誘導加熱コイル最下部より20mm下に外郭直径100mm高さ60mmである出湯ノズル加熱用高周波誘導加熱コイルを配し、その中心付近に底部に内径25mm長さ100mmの0.5mm×幅20mmのスリット加工を施したBN製ノズルを配したアルミナ製貯湯容器（内径200mm、高さ800mm）を設置した上、前記アルミナ製貯湯容器内へFe80Si6.5B12.5C1原子%の合金組成となるよう、純度99.5%以上のSi、B、CおよびFeの各元素を配合した素原料50kgを挿入後、貯湯容器加熱用高周波誘導加熱コイルへ80kW、1.5kHzの高周波出力にて素原料を1450℃まで加熱し、溶融合金にした後、出湯ノズル加熱用高周波誘導加熱コイルへ25kW、9kHzの高周波出力を付与することで出湯ノズル内の凝固合金を溶解し、出湯ノズルより溶融合金を噴出し、噴出した溶融合金の重量変化を測定した。
(Example)
High frequency induction heating coil for heating hot water storage container with outer shell diameter 400 mm and height 650 mm A high frequency induction heating coil for heating the hot water nozzle with outer shell diameter 100 mm and height 60 mm is placed 20 mm below the bottom, and the inner diameter is 25 mm at the bottom near the center. After installing an alumina hot water storage container (inner diameter 200 mm, height 800 mm) with a BN nozzle with a length of 0.5 mm and a width of 20 mm, Fe 80 Si 6.5 B is placed inside the alumina hot water storage container. 12.5 C After inserting 50 kg of raw material containing each element of Si, B, C and Fe with a purity of 99.5% or more so that the alloy composition is 1 atomic%, 80 kW, 1.5 kHz to the high frequency induction heating coil for heating the hot water storage container. After heating the raw material to 1450 ° C with the high frequency output of, it is made into a molten alloy, and then the solidified alloy in the hot water nozzle is melted by applying a high frequency output of 25kW and 9kHz to the high frequency induction heating coil for heating the hot water nozzle. The molten alloy was ejected from the hot water nozzle, and the weight change of the ejected molten alloy was measured.
溶融金属の噴出は、出湯開始から15分06秒間で停止し、溶湯噴出重量は49.8kg、残湯は出湯ノズル内に100g残っていた。残りは貯湯容器内壁に付着固化していた。図３に溶湯噴出時間を横軸に取った際の溶湯噴出重量と貯湯容器及び出湯ノズル内の溶融合金重量から想定される溶湯ヘッド圧の変化を示す。 The ejection of molten metal stopped 15 minutes and 06 seconds after the start of hot water ejection, the molten metal ejection weight was 49.8 kg, and 100 g of residual hot water remained in the hot water nozzle. The rest adhered to and solidified on the inner wall of the hot water storage container. FIG. 3 shows the change in the molten metal head pressure assumed from the molten metal ejection weight and the molten alloy weight in the hot water storage container and the molten metal nozzle when the molten metal ejection time is taken on the horizontal axis.
図３から判るように実施例に記載の溶融金属出湯方法では、貯湯容器からノズル先端にかけて発生する電磁誘導による溶融金属のダウンストリームにより、溶湯ヘッド圧の変化に因らず一定範囲の出湯レートを維持しながら貯湯容器内の溶融合金の全量を出湯ノズルから噴出することができることを確認した。 As can be seen from FIG. 3, in the molten metal hot water discharge method described in the embodiment, the hot water discharge rate within a certain range is maintained regardless of the change in the molten metal head pressure by the downstream of the molten metal due to the electromagnetic induction generated from the hot water storage container to the tip of the nozzle. It was confirmed that the entire amount of the molten alloy in the hot water storage container could be ejected from the hot water nozzle while maintaining it.
（比較例）
Fe80Si6.5B12.5C1原子%の合金組成となるよう、純度99.5%以上のSi、B、CおよびFeの各元素を配合した素原料100kgをアルミナ製坩堝へ挿入した後、高周波誘導加熱により溶解、1450℃以上の溶融合金を形成した後、SiCヒータにて1400℃まで予備加熱した外郭直径400mm高さ650mmであるアルミナ製貯湯容器に溶融合金を50kg注いだ。貯湯容器底部の中心には内径25mm長さ100mmの0.5mm×幅20mmのスリット加工を施したBN製ノズルを配し、ノズル周りにはSiCヒータを設置した上、貯湯容器同様1400℃まで予備加熱を実施した。次いで前記溶融合金を50kg注いだ後、貯湯容器用、出湯ノズル用夫々のSiCヒータを引き続き加熱し、貯湯容器内の溶融合金温度が1450℃に到達した時点で出湯ノズル上部に配したアルミナ製の溶湯ストッパーを引き抜き、出湯ノズルより溶融合金を噴出し、噴出した溶融合金の重量変化を測定した。
(Comparative example)
Fe 80 Si 6.5 B 12.5 C High frequency induction heating after inserting 100 kg of raw material containing each element of Si, B, C and Fe with a purity of 99.5% or more into an alumina crucible so that the alloy composition is 1 atomic%. After forming a molten alloy of 1450 ° C or higher, 50 kg of the molten alloy was poured into an alumina hot water storage container having an outer diameter of 400 mm and a height of 650 mm, which was preheated to 1400 ° C with a SiC heater. A BN nozzle with an inner diameter of 25 mm, a length of 100 mm, and a slit of 0.5 mm x width of 20 mm is placed in the center of the bottom of the hot water storage container, and a SiC heater is installed around the nozzle. Was carried out. Next, after pouring 50 kg of the molten alloy, the SiC heaters for the hot water storage container and the hot water nozzle were continuously heated, and when the molten alloy temperature in the hot water storage container reached 1450 ° C, the alumina was placed on the upper part of the hot water nozzle. The molten metal stopper was pulled out, the molten alloy was ejected from the hot water nozzle, and the weight change of the ejected molten alloy was measured.
溶融金属の噴出重量は、出湯開始から徐々に低下し17分30秒間で停止し、溶湯噴出重量は31.1kg、残湯は貯湯容器及び出湯ノズル内に形18.9kg残っていた。図４に溶湯噴出時間を横軸に取った際の溶湯噴出重量と貯湯容器及び出湯ノズル内の溶融合金重量から想定される溶湯ヘッド圧の変化を示す。 The spouting weight of the molten metal gradually decreased from the start of the hot water and stopped in 17 minutes and 30 seconds. The spouting weight of the molten metal was 31.1 kg, and the remaining hot water remained in the hot water storage container and the hot water nozzle at 18.9 kg. FIG. 4 shows the change in the molten metal head pressure assumed from the molten metal ejection weight and the molten alloy weight in the hot water storage container and the molten metal nozzle when the molten metal ejection time is taken on the horizontal axis.
図４から判るように比較例に記載の溶融金属出湯方法では、溶湯ヘッド圧の変化に伴い出湯レートは低下し、溶湯ヘッド圧が6kPaを下回った時点で貯湯容器内の溶融合金の出湯ノズルから噴出が停止することを確認した。 As can be seen from FIG. 4, in the molten metal hot water discharge method described in the comparative example, the hot water discharge rate decreases as the molten metal head pressure changes, and when the molten metal head pressure falls below 6 kPa, the molten alloy hot water discharge nozzle in the hot water storage container is used. It was confirmed that the eruption stopped.
本発明の溶融金属の出湯方法は、各種高性能DCブラシレスモータ並びに磁気センサ等に適用されるナノ結晶型RE-Fe-B等方性磁石およびナノ結晶Sm-Fe-N等方性磁石に加え、各種受動素子、パワーコンディショナー、モータ用コア向けの圧粉磁心等に適用されるFe-Si-B系アモルファス及びナノ結晶軟磁性材料向け材料を生産する上で必須の製造設備である単ロール溶湯急冷装置、ガスアトマイズ装置、水アトマイズ装置並びにそれらを組み合わせた各種の溶湯急冷装置において、溶融金属をオリフィス（スリット加工を含む）を施した出湯ノズルから安定した出湯レート並びに温度にて出湯可能な量産対応し易い出湯方法として広く工業的に適用可能である。 The hot water discharge method for molten metal of the present invention is in addition to nanocrystalline RE-Fe-B isotropic magnets and nanocrystalline Sm-Fe-N isotropic magnets applied to various high-performance DC brushless motors and magnetic sensors. Single-roll molten metal, which is an indispensable manufacturing facility for producing materials for Fe-Si-B-based amorphous and nano-crystalline soft magnetic materials applied to various passive elements, power conditioners, dust cores for motor cores, etc. In the quenching device, gas atomizing device, water atomizing device, and various molten metal quenching devices that combine them, mass production support that allows hot water to be discharged at a stable hot water rate and temperature from a hot water nozzle with an orifice (including slit processing) for molten metal. It can be widely and industrially applied as an easy hot water discharge method.
１ 貯湯容器用高周波誘導加熱コイル
２ 出湯ノズル用高周波誘導加熱コイル
３ 貯湯容器
４ 出湯ノズル
５ 溶融金属
６ 磁場（B）
７ 渦電流（J）
８ ピンチ力（F）
９ 溶融金属の誘導撹拌
10 溶融金属のダウンストリーム
1 High frequency induction heating coil for hot water storage container 2 High frequency induction heating coil for hot
7 Eddy current (J)
8 Pinch force (F)
9 Induced stirring of molten metal
10 Downstream of molten metal
Claims (1)
前記貯湯容器および出湯ノズルは、それぞれの周囲に、貯湯容器用高周波誘導加熱コイルおよび出湯ノズル用高周波誘導加熱コイルが設けられており、
前記貯湯容器用高周波誘導加熱コイルの外径に対して、前記出湯ノズル用高周波誘導加熱コイルの外径を１／２以下に設定し、
前記貯湯容器用高周波誘導加熱コイルと前記出湯ノズル用高周波誘導加熱コイルとの間に生じる間隔が、−５０ｍｍ以上＋１００ｍｍ以下であり、
前記貯湯容器用高周波誘導加熱コイルが生成する高周波磁場の周波数に対して、前記出湯ノズル用高周波誘導加熱コイルが生成する高周波磁場の周波数を、３倍以上６０倍以下に設定し、
前記出湯ノズルは、オリフィスを有する先端部が着脱可能とされており、
前記貯湯容器用高周波誘導加熱コイルおよび出湯ノズル用高周波誘導加熱コイルの作動により、前記貯湯容器から前記出湯ノズルに向けた溶融金属の流れを生じさせ、溶湯ヘッド圧の変化に因らず一定範囲の出湯レートを維持しながら出湯する溶融金属の出湯方法。 It is a method of discharging molten metal by melting the metal contained in the hot water storage container by heating and ejecting it from the tip of a hot water discharge nozzle extending downward from the bottom of the hot water storage container.
The hot water storage container and the hot water nozzle are provided with a high frequency induction heating coil for the hot water storage container and a high frequency induction heating coil for the hot water nozzle around each of them.
The outer diameter of the high frequency induction heating coil for the hot water discharge nozzle is set to 1/2 or less with respect to the outer diameter of the high frequency induction heating coil for the hot water storage container.
The distance generated between the high frequency induction heating coil for the hot water storage container and the high frequency induction heating coil for the hot water nozzle is -50 mm or more and +100 mm or less.
The frequency of the high frequency magnetic field generated by the high frequency induction heating coil for the hot water nozzle is set to 3 times or more and 60 times or less with respect to the frequency of the high frequency magnetic field generated by the high frequency induction heating coil for the hot water storage container.
The hot water nozzle has a removable tip having an orifice.
The operation of the high-frequency induction heating coil for the hot water storage container and the high-frequency induction heating coil for the hot water nozzle causes a flow of molten metal from the hot water storage container toward the hot water nozzle, and a certain range is generated regardless of the change in the molten metal head pressure. A method of hot water discharge of molten metal while maintaining the hot water discharge rate.
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