JPH03243727A - Induction melting method for active metal - Google Patents
Induction melting method for active metalInfo
- Publication number
- JPH03243727A JPH03243727A JP2039107A JP3910790A JPH03243727A JP H03243727 A JPH03243727 A JP H03243727A JP 2039107 A JP2039107 A JP 2039107A JP 3910790 A JP3910790 A JP 3910790A JP H03243727 A JPH03243727 A JP H03243727A
- Authority
- JP
- Japan
- Prior art keywords
- crucible
- active metal
- refractory material
- skull
- induction melting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 44
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 238000002844 melting Methods 0.000 title claims abstract description 27
- 230000008018 melting Effects 0.000 title claims abstract description 27
- 230000006698 induction Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 23
- 239000011819 refractory material Substances 0.000 claims abstract description 31
- 210000003625 skull Anatomy 0.000 claims abstract description 21
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007769 metal material Substances 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000009089 cytolysis Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 9
- 150000002739 metals Chemical class 0.000 abstract description 9
- 239000000498 cooling water Substances 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 238000000605 extraction Methods 0.000 abstract 2
- 150000001879 copper Chemical class 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 239000002893 slag Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000000365 skull melting Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野〕
本発明は、分割され且つ水冷構造の銅ルツボ（以下、分
割水冷銅ルツボと言う〉を用い、チタン、ジルコニウム
等の高融点活性金属あるいはその合金及び清浄性を要求
されるスーパーアロイを高周波誘導溶解する方法に関す
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a copper crucible with a divided water-cooled structure (hereinafter referred to as a divided water-cooled copper crucible) to process active metals with high melting points such as titanium and zirconium or their This invention relates to a method for high-frequency induction melting of alloys and superalloys that require cleanliness.
［従来の技術］
分割水冷銅ルツボを使用し、活性金属を高周波誘導溶解
する方法は古くから検討されており、数多くの技術が発
表されている。そして、種々の検討を経た後、所謂イン
ダクション・スラグ溶解法と呼ばれる技術が確立された
く米国特許３７７５０９１号公報〉。[Prior Art] A method of high-frequency induction melting of active metals using a divided water-cooled copper crucible has been studied for a long time, and many techniques have been published. After various studies, a technology called the so-called induction slag melting method was established, as disclosed in US Pat. No. 3,775,091.
この方法は、短冊状のセグメントを組み立てたルツボを
使用し、活性金属と共にスラグ又はフラックスを装入し
て誘導溶解する方法である。This method uses a crucible made up of strip-shaped segments, charges slag or flux together with an active metal, and performs induction melting.
第５図は溶解時の状態を示した図である０図中、２０は
ルツボを構成する短冊状の水冷銅セグメントであり、間
隔をあけて配置されている。６は高周波コイル、２）は
冷却流体の流路である。また、９は溶湯、２２は溶融ス
ラグ、１０はスカル（凝固シェル）を示す、そして、ル
ツボの内壁は凝固スラグ２３で覆われ、各セグメント２
ｏの間は絶縁されている。FIG. 5 is a diagram showing the state during melting. In FIG. 0, reference numeral 20 indicates rectangular water-cooled copper segments constituting the crucible, which are arranged at intervals. 6 is a high frequency coil, and 2) is a cooling fluid flow path. Further, 9 indicates molten metal, 22 indicates molten slag, and 10 indicates a skull (solidified shell).The inner wall of the crucible is covered with solidified slag 23, and each segment 2
o is insulated.
この方法の問題点のとしては、スラグ又はフラックスを
使用することによって溶融金属が汚染されると言う問題
がある。また、真空溶解を行う場合には、フラックスが
蒸発し、これが鋳造時に空孔を生成させる原因となる。A problem with this method is that the use of slag or flux contaminates the molten metal. Further, when vacuum melting is performed, the flux evaporates, which causes voids to be generated during casting.
これらの問題を解決した改良技術として、特開昭６３−
１４９３３７号公報に示された方法がある。この方法は
スラグやフラックスを使用せずに高周波誘導溶解するも
のであり、一般にインダクト・スカル溶解法と呼ばれて
いる。この方法においては、第４図に示す構成のルツボ
に装入物を入れ、真空下又は不活性雰囲気下で誘導加熱
する。As an improved technology that solved these problems, JP-A-63-
There is a method disclosed in Japanese Patent No. 149337. This method involves high-frequency induction melting without using slag or flux, and is generally called the induct skull melting method. In this method, a charge is placed in a crucible configured as shown in FIG. 4, and is heated by induction under vacuum or an inert atmosphere.
第４図はインダクト スカル溶解法に用いるルツボを示
す図であり、（４１図は正面の一部断面図、＋ｂ１図は
ｆａｔ図のＡ−Ａ断面の一部を示す図である。このルツ
ボの側壁は複数の短冊状のセグメント１が組み立てられ
て形成されている。セグメント１は間隔をあけて配置さ
れ、各セグメント１間には高温結縁材料２が詰められて
いる。セグメント１は銅製で、外管３と内管４よりなる
二重管の水冷構造になっている。そして、すべのセグメ
ント１は底部部材５に結合されている。冷却水は内管４
に導入され外管３を経由して排出される。６はルツボの
側壁を囲む位置に配置された高周波コイルである。Figure 4 is a diagram showing a crucible used in the induct skull melting method (Figure 41 is a partial sectional view of the front, Figure +b1 is a diagram showing a part of the A-A cross section of the fat diagram. The side wall is formed by assembling a plurality of strip-shaped segments 1. The segments 1 are spaced apart and a hot bonding material 2 is filled between each segment 1. The segments 1 are made of copper; It has a double pipe water cooling structure consisting of an outer pipe 3 and an inner pipe 4.All segments 1 are connected to a bottom member 5.The cooling water is supplied to the inner pipe 4.
and is discharged via the outer tube 3. 6 is a high frequency coil placed at a position surrounding the side wall of the crucible.
このような構成によるルツボを使用すれば、スラグやフ
ラックスを装入する必要がないので、上記の問題は解決
された。If a crucible with such a configuration is used, there is no need to charge slag or flux, so the above problem is solved.
［発明が解決しようとする課題］
しかし、インダクト・スカル溶解法においては、フラッ
クスやスラグを全く使用しないので、スカル（凝固シェ
ル）と銅ルツボが直接接触し、溶融金属−水冷銅セグメ
ント１間の熱移動量（溶融金属からの抜熱）が大きくな
り、多量のスカルが生成してしまう、このため、溶湯量
が少なくなり、電力原単位が非常に大きくなる。[Problems to be Solved by the Invention] However, in the induct skull melting method, no flux or slag is used, so the skull (solidified shell) and the copper crucible are in direct contact, and the gap between the molten metal and the water-cooled copper segment 1 is The amount of heat transfer (heat removed from the molten metal) increases and a large amount of skull is generated, resulting in a decrease in the amount of molten metal and an extremely high unit power consumption.
本発明は、上記の問題を解決し、溶融金属からの抜熟量
を小さくでき、電力原単位を低下させて効率よく活性金
属を溶解する誘導溶解法を提供することを目的とする。An object of the present invention is to solve the above-mentioned problems and provide an induction melting method that can reduce the amount of molten metal extracted, lower the power consumption rate, and efficiently melt active metals.
［課題を解決するための手段及び作用］上記の目的を達
成するために、本発明においては、分割水冷ルツボの底
に耐火材を配置し、次いで活性金属の素材を装入し、誘
導溶解する。[Means and effects for solving the problem] In order to achieve the above object, in the present invention, a refractory material is placed at the bottom of a split water-cooled crucible, and then an active metal material is charged and induction melted. .
また、上記ルツボの底に耐火材を配置し、該耐火材の上
に活性金属を装入し、該活性金属を誘導溶解して耐火材
の上にスカルを形成させ、出湯後、前記スカルが形成さ
れたルツボに活性金属の素材を再装入し、誘導溶解して
も上記方法と同様の結果が得られる。Further, a refractory material is placed at the bottom of the crucible, an active metal is charged onto the refractory material, and the active metal is melted by induction to form a skull on the refractory material, and after tapping, the skull is The same result as the above method can be obtained by re-charging the formed crucible with the active metal material and performing induction melting.
なお、本発明における活性金属とは、チタン、ジルコニ
ウム、ハフニウム、クロム、ニオブ、タンタル、モリブ
デン、ウラン、希土類金属及びトリウム並びにこれらの
金属の合金よりなる金属群と、さらに、スーパーアロイ
などの高清浄性を要求される金属材料を含むものとする
。Note that the active metals in the present invention include metal groups consisting of titanium, zirconium, hafnium, chromium, niobium, tantalum, molybdenum, uranium, rare earth metals, thorium, and alloys of these metals, as well as highly clean metals such as super alloys. Contains metal materials that require high properties.
耐火材は断熱作用があるので、耐火材は溶融金属とルツ
ボの底との間の熱移動を実質的に遮断し、溶融金属から
の抜熱は殆ど起こらなくなる。Since the refractory material has an insulating effect, the refractory material substantially blocks heat transfer between the molten metal and the bottom of the crucible, so that very little heat is removed from the molten metal.
耐火材の材質としては、アルミナ、ジルコニア、マグネ
シア、カルシアなどの酸化物の他にホウ化ジルコニア、
窒化ボロンなとのホウ化物や窒化物、炭化珪素、炭化チ
タンなどの炭化物、グラファイト及びフッ化カルシウム
などが使用できる。In addition to oxides such as alumina, zirconia, magnesia, and calcia, refractory materials include zirconia boride,
Borides and nitrides such as boron nitride, carbides such as silicon carbide and titanium carbide, graphite, and calcium fluoride can be used.
耐火材の形態としては、耐火材を板状にして使用するこ
とができる。また、セラミックフオーム状のもの、グラ
ファイト繊維やアルミナ繊維などを成形したものも使用
することができ、このような耐火材は断熱作用を一層発
揮する。さらに、粉状あるいは粒状の耐火材をルツボ底
部に敷きつめたものであってもよい。As for the form of the refractory material, it can be used in the form of a plate. Further, ceramic foam materials, materials formed from graphite fibers, alumina fibers, etc. can also be used, and such refractory materials exhibit even greater heat insulating properties. Furthermore, the bottom of the crucible may be covered with powdered or granular refractory material.
そして、耐火材が板状である場合、耐火材を複数枚に分
割し重ね合わせて配置すると、全体の厚さが同じであっ
ても、耐火材と耐火材の間の接触熱抵抗が増大し、断熱
効果が上がる。If the refractory material is plate-shaped, if the refractory material is divided into multiple sheets and placed one on top of the other, the contact thermal resistance between the refractory materials will increase even if the overall thickness is the same. , the insulation effect increases.
（実施例］
（実施例１）
第１図及び第２図によって説明する。ルツボは第４図の
ルツボと同様な構成により、内径１０５■■、高さ１５
０ｍ１１のものを使用した。第１図及び第２図において
、ルツボの構成については、第４図と同じ部分には同一
の符号を付し説明を省略する。(Example) (Example 1) This will be explained with reference to Figures 1 and 2.The crucible has the same configuration as the crucible in Figure 4, has an inner diameter of 105mm, and a height of 15mm.
0m11 was used. In FIG. 1 and FIG. 2, regarding the structure of the crucible, the same parts as in FIG. 4 are given the same reference numerals, and the explanation will be omitted.
耐火材７としてはアルミナ板を使用した。まず、ルツボ
の底（底部部材５上）に厚さ３５−のアルミナ板２枚配
置した。次いで、このアルミナ板の上に、Ｔｉ−６ＡＪ
ｉ’−４Ｖ合金（Ａ１６％、■４％、残りＴｉ）で、直
径９５關、長さ１５０■諷の溶解素材８を装入したく第
１図〉。As the refractory material 7, an alumina plate was used. First, two alumina plates having a thickness of 35 mm were placed on the bottom of the crucible (on the bottom member 5). Next, Ti-6AJ was placed on this alumina plate.
A molten material 8 made of i'-4V alloy (A: 16%, ■: 4%, remainder: Ti), having a diameter of 95 mm and a length of 150 mm, is charged as shown in Fig. 1.
そして、８ｋｌｌｚ 、 １００ｋｗの出力で誘導溶解
したところ、６分で３．２ｋｇの溶湯９が得られ、底部
の耐火打７上には１．４ｋｇのスカル１０ができた（第
２図）、この際の電力原単位は３．１ｋｗｈ／ｋｇであ
った。Then, when induction melting was carried out with an output of 8 kllz and 100 kw, 3.2 kg of molten metal 9 was obtained in 6 minutes, and a 1.4 kg skull 10 was formed on the refractory 7 at the bottom (Fig. 2). The electricity consumption rate was 3.1 kwh/kg.
（実施例２）
ルツボの底に３．５關のマグネシアの板３枚を配置し、
他の条件は実施例１と同じにし、Ｔｉ６ＡＪ−４Ｖ合金
を溶解した。６分で４ｋｇの溶湯が得られ、０．６ｋｇ
のスカル１０が残った。(Example 2) Three 3.5-inch magnesia plates were placed at the bottom of the crucible,
Other conditions were the same as in Example 1, and the Ti6AJ-4V alloy was melted. 4kg of molten metal is obtained in 6 minutes, 0.6kg
10 skulls remained.
この時の電力原単位は２．５ｋｗｈ／ｋｇであった。The electricity consumption rate at this time was 2.5 kwh/kg.
（実施例３）
実施例１と同様の溶解を行い、得られｆＳ溶湯を出湯し
た後のルツボ（耐火材の上にスカルが形成されたルツボ
〉に直径９５闘、長さ１０４關のＴｉ−６ＡＪ−４Ｖ合
金を装入し、８ ｋＨｚ、１００ｋｖの出力で溶解した
。６分で３．２ｋｇの溶湯が得られ、１．４ｋｇののス
カル１０ができた。この時の電力原単位は３ 、１ｋｗ
ｈ ／ｋｇであり、実施例１の場合と同じであった。(Example 3) Melting was carried out in the same manner as in Example 1, and after the obtained fS molten metal was tapped, a Ti-shaped metal with a diameter of 95 mm and a length of 104 mm was placed in a crucible (a crucible in which a skull was formed on a refractory material). 6AJ-4V alloy was charged and melted at an output of 8 kHz and 100 kV. 3.2 kg of molten metal was obtained in 6 minutes, and 1.4 kg of Skull 10 was made. The electricity consumption rate at this time was 3 , 1kw
h/kg, which was the same as in Example 1.
（実施例４）
本実施例では、ルツボの底に第３図に示す形状の耐火材
７を配置した。耐火材７は、ルツボの側壁（セグメント
１）１１１１の周辺部に環状の突起］１が設けられてお
り、内側に凹部が形成されている。このような環状の突
起１１を設けたのは、ルツボの底部に形成するスカル１
０からセグメント１側壁への熱移動を防ぎ、熱効率を高
めるためである。使用した耐火材７はアルミナで造られ
、寸法は、平面部の厚さは７關、突起１１の高さ（平板
部上面からの高さ〉が１５關、突起１１の厚さが７ｍ−
であった。(Example 4) In this example, a refractory material 7 having the shape shown in FIG. 3 was placed at the bottom of the crucible. The refractory material 7 is provided with an annular protrusion 1 on the periphery of the side wall (segment 1) 1111 of the crucible, and has a recess formed inside. The purpose of providing such an annular projection 11 is to form a skull 1 at the bottom of the crucible.
This is to prevent heat transfer from 0 to the side wall of segment 1 and increase thermal efficiency. The refractory material 7 used is made of alumina, and its dimensions are as follows: the thickness of the flat part is 7 m, the height of the protrusion 11 (height from the top of the flat part) is 15 m, and the thickness of the protrusion 11 is 7 m.
Met.
そして、他の条件は実施例１と同じにし、Ｔｉ６ＡＪ−
４Ｖ合金を誘導溶解したところ、６分で３．８ｋｇの溶
湯が得られ、底部のアルミナ板７上には０．８ｋｇのス
カル１０ができた。この際の電力原単位は２．６ｋｖｈ
／ｋｇであり、実施例１の場合よりも良好の結果が得
られた。Other conditions were the same as in Example 1, and Ti6AJ-
When the 4V alloy was induction melted, 3.8 kg of molten metal was obtained in 6 minutes, and a 0.8 kg skull 10 was formed on the alumina plate 7 at the bottom. The electricity consumption rate at this time is 2.6kvh
/kg, and better results than in Example 1 were obtained.
（比較例〉
ルツボの底にアルミナ板７を配置せず、他の条件は実施
例と同じにし、Ｔｉ−６Ａｌｌ−４Ｖ合金を誘導溶解し
た。溶湯９は６分で２．１ｋｇＬか得られず、底部に生
成したスカル１０は２．４ｋｇに増加した。この際の電
力原単位は４．８ｋｗｈ／ｋｇであった。(Comparative example) Ti-6All-4V alloy was induction melted without placing the alumina plate 7 at the bottom of the crucible and the other conditions were the same as in the example.2.1 kgL of molten metal 9 was obtained in 6 minutes. , the skull 10 generated at the bottom increased to 2.4 kg.The electric power consumption at this time was 4.8 kwh/kg.
上記各実施例と比較例の結果を比較すると、実施例の電
力原単位は比較例に対し５０〜６０％であり、大幅に低
減された。Comparing the results of each of the above Examples and Comparative Examples, the electric power consumption of the Examples was 50 to 60% of that of the Comparative Example, which was significantly reduced.
そして、２回目以降の溶解に際しては、同一組成の金属
を溶解する場合、底部のスカル１０を除去することなく
、ルツボを繰り返し使用する。この際にも上記実施例の
場合と同様に良好の結果が得られる。Then, in the second and subsequent melting, when metals of the same composition are to be melted, the crucible is used repeatedly without removing the skull 10 at the bottom. In this case as well, good results can be obtained as in the case of the above embodiment.
なお、ルツボ底部の断熱をよくし過ぎると、スカル１０
が形成されなくなり（全部溶けてしまい）、溶湯（溶融
活性金属）と耐火材の反応が起こって溶湯が汚染される
。従って、本発明においては、スカル１０が必ず形成さ
れるように、溶解出力を調節、又は耐火材の構成を変え
て断熱条件を調整する必要があることは言うまでもない
。In addition, if the insulation at the bottom of the crucible is too good, the skull
is no longer formed (it all melts), and a reaction between the molten metal (molten active metal) and the refractory material occurs, resulting in contamination of the molten metal. Therefore, in the present invention, it goes without saying that it is necessary to adjust the melting output or change the composition of the refractory material to adjust the insulation conditions so that the skull 10 is definitely formed.
［発明の効果コ
本発明は、ルツボの底に耐火材を配置するか、あるいは
ルツボの底に耐火材を配置しこの耐火材の上にスカルを
形成させ、出湯後に溶解素材を再装入して活性金属を誘
導溶解する方法であるので、ルツボの底に耐火材の断熱
層ができ、溶融金属とルツボの底との間の熱移動は実質
的に遮断される。[Effects of the Invention] The present invention is characterized in that a refractory material is placed at the bottom of a crucible, or a refractory material is placed at the bottom of a crucible, a skull is formed on the refractory material, and melted material is re-charged after tapping. Since this method involves induction melting of active metals, a heat insulating layer of refractory material is formed at the bottom of the crucible, and heat transfer between the molten metal and the bottom of the crucible is substantially blocked.
従って、溶融金属からの抜熱は殆ど起こらなくなり、熱
効率が大幅に向上する。この結果、電力原単位は従来技
術に対し大幅（５０％程度まで）に低減できる。Therefore, almost no heat is removed from the molten metal, and thermal efficiency is greatly improved. As a result, the power consumption rate can be significantly reduced (up to about 50%) compared to the conventional technology.
第１図及び第２図は本発明の一実施例の説明図、第３図
は本発明の他の実施例の説明図、第４図はインダクト・
スカル溶解法に用いるルツボを示す図、第５図はインダ
クション スラグ溶解法における溶解時の状態を示した
図である。
１．２０・・・水冷銅セグメント、２・・高温絶縁材料
、３・・外管、４・・・内管、５・・・底部部材、６
・高周波コイル、７・・・耐火材、８・溶解素材、９・
溶湯、１０・・スカル。1 and 2 are explanatory diagrams of one embodiment of the present invention, FIG. 3 is an explanatory diagram of another embodiment of the present invention, and FIG. 4 is an explanatory diagram of an inductor.
A diagram showing a crucible used in the skull melting method, and FIG. 5 is a diagram showing a state during melting in the induction slag melting method. 1.20...Water-cooled copper segment, 2...High temperature insulating material, 3...Outer tube, 4...Inner tube, 5...Bottom member, 6
・High frequency coil, 7... Fireproof material, 8. Melting material, 9.
Molten metal, 10...Skull.
Claims (2)
において、 前記ルツボの底に耐火材を配置し、次いで前記活性金属
の素材を装入し、誘導溶解することを特徴とする活性金
属の誘導溶解法。(1) An active metal induction melting method using a divided water-cooled copper crucible, characterized in that a refractory material is placed at the bottom of the crucible, and then the active metal material is charged and induction melted. induction lysis method.
において、 前記ルツボの底に耐火材を配置し、該耐火材の上に前記
活性金属を装入し、該活性金属を誘導溶解して前記耐火
材の上にスカルを形成させ、出湯後、前記スカルが形成
されたルツボに前記活性金属の素材を再装入し、誘導溶
解することを特徴とする活性金属の誘導溶解法。(2) In the induction melting method of active metal using a divided water-cooled copper crucible, a refractory material is placed at the bottom of the crucible, the active metal is charged on top of the refractory material, and the active metal is induction melted. A method for induction melting of an active metal, comprising: forming a skull on the refractory material, and after tapping the hot water, reinjecting the active metal material into the crucible in which the skull has been formed, and performing induction melting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2039107A JPH03243727A (en) | 1990-02-20 | 1990-02-20 | Induction melting method for active metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2039107A JPH03243727A (en) | 1990-02-20 | 1990-02-20 | Induction melting method for active metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03243727A true JPH03243727A (en) | 1991-10-30 |
Family
ID=12543852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2039107A Pending JPH03243727A (en) | 1990-02-20 | 1990-02-20 | Induction melting method for active metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03243727A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009085525A (en) * | 2007-10-01 | 2009-04-23 | Shinko Electric Co Ltd | Cold-crucible melting furnace |
-
1990
- 1990-02-20 JP JP2039107A patent/JPH03243727A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009085525A (en) * | 2007-10-01 | 2009-04-23 | Shinko Electric Co Ltd | Cold-crucible melting furnace |
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