CN102072649A - Cold crucible induction heating suspension furnace - Google Patents
Cold crucible induction heating suspension furnace Download PDFInfo
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- CN102072649A CN102072649A CN 201110035250 CN201110035250A CN102072649A CN 102072649 A CN102072649 A CN 102072649A CN 201110035250 CN201110035250 CN 201110035250 CN 201110035250 A CN201110035250 A CN 201110035250A CN 102072649 A CN102072649 A CN 102072649A
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Abstract
The invention relates to a cold crucible induction heating suspension furnace. The suspension furnace comprises a suspension vacuum furnace body, wherein a cold crucible and an inductor are arranged in the furnace body. The suspension furnace is characterized in that: the upper part of the cold crucible is a cylindrical body which has the inner side taper of less than 3 degrees, and the bottom of the cold crucible is a semispherical body; the inductor is wound on the cold crucible; and the upper section of the inductor is a cylindrical body section which is cylindrically wound on the upper part of the cold crucible, and the lower section of the inductor is semispherically wound at the bottom of the cold crucible. The suspension furnace has the advantages that: the structures of the cold crucible and the inductor in the conventional cold crucible suspension furnace are mainly changed; after change, the temperature of molten metal in the crucible is greater than 200 DEG C, so that titanium, zirconium, chromium and vanadium can be melted; and the bottom of the crucible is not provided with a kish during smelting of the suspension furnace, so that the problem that a metal element with a high melting point and high density in an alloy furnace charge cannot be melted when adhered to the kish is solved. The problem of non-ideal inclusion caused by incomplete melting of a high-melting-point component which generally occurs in the alloy with greatly different melting points and density is solved.
Description
Technical field
The present invention relates to a kind of cold crucible eddy-current heating shower furnace, belong to metallurgy industry eddy-current heating skull crucible technical field.
Background technology
Produce the high-grade alloy steel precision casting at present, produce rare earth metal and alloy thereof intermediate frequency furnace commonly used, produce titanium and alloy thereof cold crucible skull crucible commonly used and vacuum consumable electrode arc furnace.These production methods all respectively have its pluses and minuses, and during the conventional vacuum induction furnace melting, melt is easy to suffer furnace lining material to pollute.Skull crucible causes alloying component inhomogeneous because of its bottom has scull, high density refractory metal to be bonded in easily on the scull because of not melting fully.Consumable electroarc furnace is not pulled because of liquid alloy in the molten bath, causes alloying component inhomogeneous easily.Domesticly develop a kind of cold crucible shower furnace again according to the cold crucible skull crucible, this stove can only melt titanium (not molten titanium piece, 1660 ℃ of titanium fusing points are left in the bottom) at present reluctantly, metals such as can not the melting fusing point higher chromium, zirconium, vanadium.
About smelting in suspension and cold crucible technology, retrieve four of domestic relevant patents, CN1136428C.CN1267815.CN201463537U and CN101776390A.Wherein CN1136428C relates generally to the cold crucible manufacturing issue, and inductor wherein is two high frequency electric source power supplies.CN201463537U is cold crucible and inductor design manufacturing theory to the effect that, does not have example.About the high frequency electric source problem, statement is indistinct: " frequency of supply of auxiliary induction circle can be different with the main induction circle, also can be identical ", we understand, and equally also are two high frequency electric source power supplies.
Summary of the invention
The purpose of this invention is to provide the single high frequency electric source power supply of a kind of employing, simple in structure, production cost is low, crucible bottom does not have scull during melting, high-melting-point in the alloy furnace charge can not appear, the high desnity metal element is (as the niobium in the titanium alloy, tantalum, molybdenum, tungsten etc.), be bonded in the problem that can not melt on the scull, and the alloy liquation is in half suspended state of rotation under the effect of inductor, not only can melting and titanium alloy, also can be used for producing and contain the fusing point height, other alloy of the active element of chemistry, as contain zirconium, vanadium, niobium, tungsten, the alloy of thulium, also can be used for producing rare earth metal, high-purity, high performance rareearth magnetic material, the cold crucible eddy-current heating shower furnace of high-alloy steel etc.
The objective of the invention is to realize in the following manner:
The present invention includes suspension vacuum drying oven body of heater, be provided with cold crucible and inductor in the body of heater, it is characterized in that: cold crucible top is the cylinder of inboard tapering＜3 °, the bottom is a hemisphere, inductor is wrapped on the cold crucible, its epimere is the cylindrical shell portion that is wrapped in cold crucible top, and hypomere is that hemispherical is wrapped in the cold crucible bottom.
Advantage of the present invention is: the present invention changes at cold crucible and sensor structure in the existing cold crucible shower furnace, after the change, the temperature of liquid metal improves＞200 ℃ in the crucible, is using same high-frequency heating power, crucible capacity (V=280cm
3) under the also identical situation, can only melt titanium (1660 ℃ of fusing points) in the past.And shower furnace of the present invention can not only melt titanium, and can melt zirconium (1852 ℃ of fusing points), chromium (1857 ℃ of fusing points) and vanadium (1902 ℃ of fusing points), after the defeated turnout of equipment reaches rated value＜melted clear in 3 minutes; Crucible bottom does not have scull during shower furnace melting of the present invention, high-melting-point in the alloy furnace charge, high desnity metal element (as the niobium in the titanium alloy, tantalum, molybdenum, tungsten etc.) can not occur, is bonded in the problem that can not melt on the scull.And molten metal is in half suspended state of rotation under the effect of special construction crucible-inductor, Rong refractory metal piece does not spin upside down in company with high-temperature metal liquid, because of closely contacting by alloying with high temperature parent metal liquid, thereby fusing point progressively reduces and melts, and solves the not exclusively fusing and the undesirable problem that is mingled with occurs of the high-melting-point constituent element that often occurs in the alloy that fusing point, density differ greatly.Adopting shower furnace of the present invention is alloys such as user's melting V-Ti, V-Ta, the ingot casting any surface finish, and dark shrinkage cavity, end face does not have slag, and is bright and clean as mirror.Ingot cutting checks that quality is even, shrinkage cavity＜3.0mm.It is satisfied to ingot quality that customer analysis detects the back; Melting can be carried out under vacuum, and impurity elements such as hydrogen, nitrogen, oxygen can be got rid of in refining process gradually; In casting process, the alloy liquation still is in half suspended state of rotation, and it is inhomogeneous can not alloying component to occur.In the ingot casting process, take appropriate measures and to control the crystalline texture of ingot casting, can produce the suitable necessary high-quality ingot casting of following process.
Description of drawings
Fig. 1 is the profile schematic diagram of cold crucible eddy-current heating shower furnace body of heater of the present invention and supporting powering shelf;
Fig. 2 is the structural representation of cold crucible of the present invention and inductor;
Fig. 3 is the vertical view of cold crucible of the present invention and inductor.
Among the figure: 1-suspension vacuum drying oven body of heater, the matching used high frequency electric source of 2-and vacuum drying oven, the 3--cold crucible, 4--inductor, 5--are in the melt of half suspended state of rotation, the cooling-water duct in the 6--crucible lobe, the unfused blank of 7-, the power interface of 8--inductor, the cooling-water duct of 9--inductor, the interface of 10-cable and inductor.
The specific embodiment
With reference to accompanying drawing, the present invention includes suspension vacuum drying oven body of heater 1, be provided with cold crucible 3 and inductor 4 in the body of heater 1, cold crucible 3 usefulness copper bar material or heavy wall copper pipe are made, and crucible 3 tops are the cylinder (that is: the outer wall top of crucible 3 is cylinder, inner chamber has＜3 ° tapering) of inboard tapering＜3 °, the bottom is a hemisphere, crucible 3 entire body longitudinal parities are divided into 8～30 lobes, and cooling-water duct 6 is arranged in the lobe, and the gap separates with radiation-resistant heat-resistant insulation material between lobe.The several size decisions of crucible lobe according to the crucible capacity.Inductor 4 is by the copper pipe coiling, interior logical cooling water.Inductor 4 is wrapped on the cold crucible 3, and its epimere is the cylindrical shell portion that is wrapped in cold crucible 3 tops, and hypomere is that hemispherical is wrapped in cold crucible 3 bottoms.Inductor 4 is wrapped in the periphery and the hemisphere surface of crucible 3, and the effect of crucible bottom inductor is the input power that increases crucible bottom, improves bath temperature and makes the scull fusing.Its another effect is suspending power and the magnetic mixing power that increases melt, makes melt be in half suspended state of rotation, makes alloying element and parent metal better mixed.
Its using method is: the crucible inductor system that cold crucible of the present invention and inductor are constituted places the vacuum furnace chamber, and the furnace charge for preparing is packed in the crucible, and active element, volatile furnace charge place in the different feed bins of crucible top successively according to furnace charge character.Start the vacuum unit, when vacuum reached 0.6～6Pa in the furnace chamber, inductor was connected the high frequency electric source of 8-30KHZ, and vacuum melting (is filled the Ar melting as needs, needed vacuum to reach 6 * 10
-2Pa fills Ar again, restarts the high frequency electric source melting).Furnace charge in the crucible issues heat fusing at the electromagnetic induction of inductor.Feed bin is opened in molten clear back refining (the about 5-15 of refining time minute, decide with alloying component) then successively, and alloying element is added the molten bath.Some element such as Sm, Sn, need add after filling Ar again, to reduce volatilizing loss; Active metal such as rare earth element y, Ce, La, Pr etc. need to add after refining, to reduce scaling loss.After refining is finished, metal liquid is cast into ingot mould or casting mold.
Embodiment 1: the smelting metal vanadium: 1902 ℃ of fusing points.Density 6.11g/cm
3, example weight 1.09kg.
The molten purpose of examination: investigate the smelting capacity of equipment of the present invention, maximum operation (service) temperature, smelting furnace capacity.
Implementation process: 1. weigh, one of strip 40 * 30 * 90mm vanadium piece, heavy 1.09kg inserts cold crucible; 2. close the vacuum bell, start the vacuum unit, vacuum reaches 6 * 10
-2Pa fills Ar; 3. start high frequency electric source＜8～30KHz〉inductor is powered; 4. the defeated turnout of power supply reaches rated power and began fusing in about 30 seconds, and about 180 seconds molten clear; 5. refining 3-5 minute, stop high frequency electric source; 6. ingot casting; 7. extracting vacuum again treats that ingot casting cooling back takes out ingot casting weigh (weightless 24 grams).
The examination result: the ingot casting any surface finish, shrinkage cavity diameter＜3mm is checked in ingot cutting, quality is even, satisfied melting result behind the customer analysis.
Embodiment 2: melting vanadium tantalum alloy: V: 1902 ℃ of sponge vanadium fusing points, density 3.5g/cm
3(test density), weight 760 grams; Ta: 2996 ℃ of fusing points, density 16.65g/cm
3Weight 190 grams.
The molten purpose of examination: investigate the differ greatly melting usefulness of alloy of equipment melting fusing point and density.
Implementation process: 1, (finished by the user) and weigh, raw material are blended in protective atmosphere (Ar) lower lock block and pass to the cylinder (in case material looses) that electric current tentatively sinters the high 100mm of diameter 50mm into again; 2, weigh and place in the cold crucible weight 0.95kg; 3, close the vacuum bell, start the vacuum unit, vacuum reaches 6 * 10
-2Pa fills Ar; 4, (8～30KHz) power to inductor to start high frequency electric source; 5, power output reaches rated power, and about 2 minutes begin fusing, and about 5 minutes molten clear; 6, refining is 5 minutes; 7, ingot casting stops high frequency electric source, and extracting vacuum has a power failure and cools off; 8, after the ingot casting cooling, weigh (weightless 40 grams); 9, ingot casting is inverted in and repeats the remelting of above-mentioned 1-7 process in the cold crucible; 10, weighing weightless again 20 grams behind the taking-up ingot.
Investigate the result: the dark shrinkage cavity of ingot casting any surface finish, end face is bright and clean as mirror, the ingot cutting inspection, quality is even, and shrinkage cavity is very little, free from admixture (shrinkage cavity diameter＜3mm) behind user's sample analysis the melting result is satisfied with in the shrinkage cavity.
Claims (2)
1. cold crucible eddy-current heating shower furnace, comprise suspension vacuum drying oven body of heater, be provided with cold crucible and inductor in the body of heater, it is characterized in that: cold crucible top is the cylinder of inboard tapering＜3 °, the bottom is a hemisphere, inductor is wrapped on the cold crucible, and its epimere is the cylindrical shell portion that is wrapped in cold crucible top, and hypomere is that hemispherical is wrapped in the cold crucible bottom.
2. cold crucible eddy-current heating shower furnace according to claim 1 is characterized in that: crucible entire body longitudinal parity is divided into 8～30 lobes, and cooling-water duct is arranged in the lobe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110035250 CN102072649A (en) | 2011-01-27 | 2011-01-27 | Cold crucible induction heating suspension furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110035250 CN102072649A (en) | 2011-01-27 | 2011-01-27 | Cold crucible induction heating suspension furnace |
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| CN102072649A true CN102072649A (en) | 2011-05-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517460A (en) * | 2011-12-31 | 2012-06-27 | 宁波江丰电子材料有限公司 | Method for purifying tantalum powder and tantalum target |
| CN105276980A (en) * | 2014-05-28 | 2016-01-27 | 国核华清（北京）核电技术研发中心有限公司 | Ceramic crucible |
| CN106839762A (en) * | 2016-12-23 | 2017-06-13 | 李蔚晶 | The Cold crucible induction melting method of superelevation smelting temperature |
| CN111206162A (en) * | 2020-02-25 | 2020-05-29 | 中国科学院金属研究所 | Rare earth metal purification method and purification equipment |
| CN111854431A (en) * | 2020-07-10 | 2020-10-30 | 吴书平 | Heating system in immersive stove |
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| CN1071502A (en) * | 1992-11-23 | 1993-04-28 | 冶金工业部钢铁研究总院 | Cold crucible for induction furnace |
| CN1082702A (en) * | 1992-06-02 | 1994-02-23 | 科学技术厅金属材料技术研究所 | Adopt the float melting apparatus and the method thereof of axially movable crucibles |
| JPH1187044A (en) * | 1997-09-04 | 1999-03-30 | Fuji Electric Co Ltd | Bottom part molten metal tap type float solution device and its tap method |
| US5889813A (en) * | 1995-08-25 | 1999-03-30 | Fuji Electric Co., Ltd | Levitation melting furnace |
| JP2000256708A (en) * | 1999-03-03 | 2000-09-19 | Fuji Electric Co Ltd | Production of clean metal powder |
| JP2004093090A (en) * | 2002-09-04 | 2004-03-25 | Shinko Electric Co Ltd | Cold crucible melting furnace |
| JP2004108666A (en) * | 2002-09-19 | 2004-04-08 | Fuji Electric Systems Co Ltd | Crucible-shaped induction furnace |
| CN101776390A (en) * | 2009-01-14 | 2010-07-14 | 贵州贵航能发装备制造有限公司 | Vacuum induction smelting cold crucible system |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1082702A (en) * | 1992-06-02 | 1994-02-23 | 科学技术厅金属材料技术研究所 | Adopt the float melting apparatus and the method thereof of axially movable crucibles |
| CN1071502A (en) * | 1992-11-23 | 1993-04-28 | 冶金工业部钢铁研究总院 | Cold crucible for induction furnace |
| US5889813A (en) * | 1995-08-25 | 1999-03-30 | Fuji Electric Co., Ltd | Levitation melting furnace |
| JPH1187044A (en) * | 1997-09-04 | 1999-03-30 | Fuji Electric Co Ltd | Bottom part molten metal tap type float solution device and its tap method |
| JP2000256708A (en) * | 1999-03-03 | 2000-09-19 | Fuji Electric Co Ltd | Production of clean metal powder |
| JP2004093090A (en) * | 2002-09-04 | 2004-03-25 | Shinko Electric Co Ltd | Cold crucible melting furnace |
| JP2004108666A (en) * | 2002-09-19 | 2004-04-08 | Fuji Electric Systems Co Ltd | Crucible-shaped induction furnace |
| CN101776390A (en) * | 2009-01-14 | 2010-07-14 | 贵州贵航能发装备制造有限公司 | Vacuum induction smelting cold crucible system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517460A (en) * | 2011-12-31 | 2012-06-27 | 宁波江丰电子材料有限公司 | Method for purifying tantalum powder and tantalum target |
| CN102517460B (en) * | 2011-12-31 | 2014-02-05 | 宁波江丰电子材料有限公司 | Method for purifying tantalum powder and tantalum target |
| CN105276980A (en) * | 2014-05-28 | 2016-01-27 | 国核华清（北京）核电技术研发中心有限公司 | Ceramic crucible |
| CN105276980B (en) * | 2014-05-28 | 2017-11-03 | 国核华清（北京）核电技术研发中心有限公司 | ceramic crucible |
| CN106839762A (en) * | 2016-12-23 | 2017-06-13 | 李蔚晶 | The Cold crucible induction melting method of superelevation smelting temperature |
| CN111206162A (en) * | 2020-02-25 | 2020-05-29 | 中国科学院金属研究所 | Rare earth metal purification method and purification equipment |
| CN111854431A (en) * | 2020-07-10 | 2020-10-30 | 吴书平 | Heating system in immersive stove |
| CN111854431B (en) * | 2020-07-10 | 2021-02-19 | 吴书平 | Heating system in immersive stove |
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Application publication date: 20110525 |