CN103212675A - Steel ingot feeder head induction heating and electromagnetic stirring device - Google Patents
Steel ingot feeder head induction heating and electromagnetic stirring device Download PDFInfo
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- CN103212675A CN103212675A CN2013101588410A CN201310158841A CN103212675A CN 103212675 A CN103212675 A CN 103212675A CN 2013101588410 A CN2013101588410 A CN 2013101588410A CN 201310158841 A CN201310158841 A CN 201310158841A CN 103212675 A CN103212675 A CN 103212675A
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- steel ingot
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- rising head
- induction coils
- feeder head
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/06—Heating the top discard of ingots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
Abstract
The invention discloses a steel ingot feeder head induction heating and electromagnetic stirring device which can be used for heating and heat preservation and electromagnetic stirring for a cast ingot feeder head made of ferrous and nonferrous materials. The steel ingot feeder head induction heating and electromagnetic stirring device is characterized in that a plurality of groups of induction coils (5) are vertically placed outside a heat preservation sleeve (2) of a steel ingot feeder head and connected with a three-phase power frequency power cabinet (7) through water-cooled cables, and magnet yokes (10) are evenly distributed outside the plurality of groups of induction coils (5) along the peripheral direction. After the steel ingot feeder head induction heating and electromagnetic stirring device is powered on, a magnetic field is formed around the steel ingot feeder head to carry out induction heating on feeder head liquid steel, compensate heat loss of the feeder head in steel ingot solidification, slow solidification process of the feeder head and improve feeding capacity of the feeder head. Meanwhile, a metal melt has an electromagnetic stirring effect under the action of the magnetic field, the circulation that liquid metal in the center of a steel ingot moves upwards and liquid metal outside the steel ingot moves outwards is formed, and gas and inclusion in the melt can be discharged beneficially. Through the interaction effect of two physical processes, the phenomena of center porosity and center segregation of the steel ingot are reduced, and quality of the steel ingot is improved.
Description
Technical field
The present invention relates to metallurgy and machinery manufacturing industry, be a kind of device that is used for steel ingot rising head eddy-current heating and electromagnetic agitation in the large-scale steel ingot production that is applicable to specifically, be input to the electrical power of electromagnetic induction coil by adjusting, can carry out eddy-current heating and electromagnetic agitation to the riser metal liquid of different size steel ingot, reduce the rising head size, improve the degree of purity of steel ingot ingot body.
Background technology
Development along with China's weight equipment, metallurgy, thermoelectricity, nuclear power cause, more and more stricter to the large forgings quality requirement, large-scale steel ingot is as the raw material of forging, its quality directly influences and is determining the quality of forging, this just requires forging to develop to high quality with steel ingot, will production high-quality large-scale steel ingot at first to solve shrinkage cavity in the steel ingot, shrinkage porosite, casting flaw problem such as loose, also to reduce the field trash in the steel ingot, improve the degree of purity of steel ingot, and the key that addresses the above problem is to improve the riser feeding ability and impels field trash fully to float.
At present, technology such as the existing electric heating rising head in industrial ingot field, these prior aries are passed through methods such as electric arc, plasma or chemical heat to the rising head heat tracing, compensation rising head thermal loss, improve the feeding capacity of rising head, but there is weak point in above-mentioned technology, and the heat of input mainly concentrates near the calandria, has that heating surface (area) (HS is little, the thermal efficiency is low and pollutes problem such as molten steel.
Chinese patent (CN102350485A) discloses a kind of intermediate frequency electrical heating steel embryo casting feeding aperture apparatus and technology.This patent scope of application is not at the steel ingot production process, inapplicable ingot casting occasion, this patent adopts single-phase winding coil to steel embryo rising head eddy-current heating, in the eddy-current heating process, will produce magnetic field around the coil, under the effect of magnetic field, the molten metal in centre is squeezed and flows up and down, forms the circulation of segmentation, and wherein downward liquid stream not only can hinder floating foreign, also the field trash that will float easily is rolled into ingot body inside again, reduces the degree of purity of steel ingot.It should further be appreciated that simultaneously: the used intermediate frequency electric heater unit of this patent is enclosed within the rising head outside, has the leakage field phenomenon, reduces eddy-current heating efficient, and the magnetic line of force of dispersing can be to the swage eddy-current heating during by swage, the cooling capacity of reduction swage.
Summary of the invention
In order to overcome deficiency and the defective that existing ingot casting technology exists, the invention provides a kind of steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, this invention adopts many group coils to form magnetic field, can not only carry out eddy-current heating to the steel ingot rising head, reduce the setting rate of rising head, improve the feeding capacity of rising head, can also improve the flow regime of molten metal simultaneously, impel field trash fully to float, improve the degree of purity of steel ingot.
The technical solution adopted for the present invention to solve the technical problems is: described steel ingot rising head eddy-current heating and electromagnetic mixing apparatus comprise base, support arm and organize induction coil more that the outer surface of base side wall is symmetrical arranged hanger.It is characterized in that: build into the riser head heat-preserving cover by laying bricks or stones with flame-proof thermal insulation material on the described base, place many group induction coils in riser head heat-preserving cover external vertical, many group induction coils connect the three phase worker power cabinet by water-cooled cable, the mode of connection of many group induction coils and power supply adopts six groups of three-phases or two-phase four winding methods, uniform yoke is along the circumferential direction gone up in many group induction coils outside, clamping and fastening is carried out with corrosion resistant plate in the yoke outside, corrosion resistant plate is welded on the support arm, support arm is fixed in the groove of base, cooling water system is connected with many group induction coils, by cooling water many groups induction coil is cooled off.
Among the present invention, described many group induction coil configurations are identical, and by odd-shaped cross section pure copper tube dish curl, near the pipe thickness d=10-20mm that emits oral-lateral, described many group induction coil outer surfaces are surrounded by mica tape, and scribble insulated paint.
Among the present invention, described steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, supply frequency is a power frequency, and electromagnetic agitation is strong, under function composite by electromagnetic stirring, the molten steel on last plane rolls and can produce hump, floating field trash is brought in the molten steel,, made the molten steel of going up the plane roll comparatively steady for reducing hump height, should reduce coil height, requiring the total height of many group induction coils and the aspect ratio of riser metal liquid is between the 0.5-0.9.
Among the present invention, described yoke is stacked by silicon steel sheet and forms, and the cross sectional shape of yoke is " Contraband " shape, its front cover corrosion resistant plate and silicon steel sheet contact portion separate with micarex, use the micarex consolidation between yoke and the coil,, avoid damaging the insulating barrier of induction coil to reduce the coil vibration.Yoke mainly plays magnetic screening action, and the magnetic line of force of constraint induction coil is outwards dispersed, and has both improved eddy-current heating efficient, can prevent the sensed heating of ingot body swage again and heats up.
Among the present invention, described base material is a stainless steel, leaves the gap between yoke and the base, and fills adiabatic insulating materials and carry out insulation processing in the gap.
Among the present invention, described riser head heat-preserving cover is assembled by refractory brick and heat-insulating shield, the wall thickness of riser head heat-preserving cover is 80-200mm, the riser head heat-preserving cover is fastened on the supporting construction, to guarantee that riser head heat-preserving is with the hydrostatic pressure of sufficient intensity opposing rising head molten steel, guaranteeing does not simultaneously have ferrimagnet between riser head heat-preserving cover and the induction coil.
Among the present invention; thermocouple is wrapped in the corundum protection tube; be inserted in the molten metal of rising head; be wired to recording instrument without paper; the temperature of detection record rising head molten steel; the temperature-fall period at feedback rising head position is regulated the input power of power frequency supply and is controlled the rising head process of setting according to feedack.
Among the present invention, adopt six groups of induction coils vertically to be placed on rising head flame-proof thermal insulation material outside, six groups of induction coils, per two groups of coils series connection is received the three phase worker power cabinet by water-cooled cable, and the mode of connection of six groups of induction coils adopts six groups of coil connections of three-phase.Also can adopt four groups of induction coils vertically to be placed on rising head flame-proof thermal insulation material outside, per two groups of coils series connection is received the three phase worker power cabinet by water-cooled cable, and the mode of connection of four groups of induction coils adopts four groups of coil connections of two-phase.
Among the present invention, cooling water system provides cooling water for induction coil, by cooling water many groups induction coil is cooled off, and is provided with temperature measuring equipment at delivery port, requires leaving water temperature not to be higher than 55 ℃.
The present invention adopts power frequency supply, the heat that is produced in the eddy-current heating process is to be produced by the molten metal in " the hot eddy current depth of penetration " basically, and the heat of interior metal liquid mainly relies on heat exchange pattern to obtain, " the hot eddy current depth of penetration " is big more, the volume of eddy-current heating is also just big more, and " the hot eddy current depth of penetration " is inversely proportional to 1/2 power that is input to coil frequency, power frequency is compared than intermediate frequency, frequency is low, " the hot eddy current depth of penetration " is dark, the volume of heating is big, with 1550 ℃ of carbon steels is example, power frequency " the hot eddy current depth of penetration " is 90mm, and intermediate frequency 500Hz " the hot eddy current depth of penetration " is 28mm, so power frequency is applicable to the eddy-current heating of steel ingot major diameter rising head.
The present invention is owing to adopt the polyphase windings coil to receive three phase worker power, coil can form magnetic field after connecting power supply, this magnetic field type is different with the magnetic field type that the single phase winding winding of Frequency Induction Heating forms, molten steel is under this magnetic field effect, the centre molten metal moves upward, external metallization liquid moves downward, make metal bath inside form whole circulation, field trash fully floats under the drive of the upwelling at molten steel center, help reducing the field trash of ingot body inside like this, improve ingot quality.
Heating, the intensity of stirring and the heating rate of molten steel of the present invention in the eddy-current heating process can be controlled by the power of the power frequency supply of importing induction coil fully.
The present invention has following beneficial effect: the invention belongs to eddy-current heating, in the eddy-current heating process, heat is the volume heat that is directly generated by " the hot eddy current depth of penetration " inner metal liquid, and the heating volume is big, thermal efficiency height.By induction coil to rising head molten steel eddy-current heating, the thermal loss of rising head in the compensation ingot solidification process, the setting time that prolongs the rising head molten steel guarantees that rising head has the ingot body feeding of enough molten steel to steel ingot, help reducing the rising head proportion, improve the steel ingot utilization rate.The electromagnetic stirring force in the molten steel and the square root of supply frequency are inversely proportional to, the low more mixing power of frequency is big more, therefore adopt power frequency to form the motion state that big electromagnetic stirring force quickened and changed melt, the high-temperature fusant that this motion helps the central area on the one hand washes away the crystallization forward position, impel the refuse of crystallization forward position dendrite, the electromagnetic stirring force that is produced produces mechanical shear stress to the dendrite of growth on the other hand, dendrite is fractureed, prevented interlaced, the cross-over connection of dendritic arm like this, guarantee the unobstructed of feeding passage, exempted from the formation of secondary pipe effectively.Adopt eddy-current heating, reduce the speed of the temperature decline of rising head molten steel, for providing of inclusion floating favourable temperature conditions, simultaneously, the present invention adopts many group induction coils to be connected to three phase worker power, after connecting power supply, coil forms magnetic field, and molten steel produces the electromagnetic agitation effect under this magnetic field effect, make the centre molten metal move upward, external metallization liquid moves downward, form whole circulation, under the drive of center molten steel upwelling, impel the gas in the melt and the abundant come-up of inclusion particle, reduce the field trash in the molten steel, improve ingot quality.The present invention adopts power frequency supply, and equipment is simple to be realized easily, need not variable-frequency power sources, can be adapted to the insulation heating of the steel ingot rising head of different tonnages.
Description of drawings
Fig. 1 is the front view of steel ingot rising head eddy-current heating and electromagnetic mixing apparatus structural representation;
Fig. 2 is the vertical view of steel ingot rising head eddy-current heating and electromagnetic mixing apparatus structural representation;
Fig. 3 is steel ingot rising head eddy-current heating and electromagnetic mixing apparatus (six groups of coils of three-phase) structural representation
Fig. 4 is steel ingot rising head eddy-current heating and electromagnetic mixing apparatus (four groups of coils of two-phase) structural representation;
Fig. 5 is steel ingot rising head eddy-current heating and electromagnetic mixing apparatus " Contraband " shape magnetic yoke structure schematic diagram;
Fig. 6 is the sectional view of steel ingot rising head eddy-current heating and electromagnetic mixing apparatus coil;
Fig. 7 is the circuit connecting schematic diagram of steel ingot rising head eddy-current heating and six groups of coils of electromagnetic mixing apparatus three-phase;
Fig. 8 is the circuit connecting schematic diagram of steel ingot rising head eddy-current heating and four groups of coils of electromagnetic mixing apparatus two-phase.
In above-mentioned accompanying drawing, 1. steel ingot rising head, 2. riser head heat-preserving cover, 3. base, 4. support arm more than 5. group induction coils, 5a. six groups of induction coils, four groups of induction coils of 5b., 6. hanger, 7. power frequency supply cabinet, 8. heat preserving agent, 9. cooling water system, 10. yoke, 11. thermocouples, 12. recording instrument without paper.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Fig. 3 is the structural representation of steel ingot rising head eddy-current heating disclosed by the invention and electromagnetic mixing apparatus (six groups of coils of three-phase), and 137 tons of the quality of steel ingot, material are the 0Cr13Ni4Mo stainless steel, 1550 ℃ of pouring temperatures.Steel ingot rising head weight is 28 tons, rising head lower surface diameter 2550mm, rising head upper surface 2300mm, riser height 1200mm.It is 120mm that riser head heat-preserving overlaps 2 wall thickness, and riser head heat-preserving cover 2 is assembled by refractory brick and heat-insulating shield, and the riser head heat-preserving cover is fastened on the supporting construction, and base 3 sidewall outer surfaces are symmetrical arranged hanger 6.On base 3, place riser head heat-preserving cover 2, six groups of induction coil 5a are placed in outside at riser head heat-preserving cover 2, there is not ferrimagnet between 2 and six groups of induction coil 5a of riser head heat-preserving cover, six groups of induction coil 5a are by odd-shaped cross section pure copper tube dish curl, near emitting the pipe thickness d of oral-lateral is 20mm, and its outer surface is surrounded by mica tape, and scribbles insulated paint, per two groups of coils series connection is received three phase worker power cabinet 7 by water-cooled cable again among six groups of induction coil 5a.The mode of connection of six groups of induction coil 5a and power supply is the circuit connecting of six groups of coils of three-phase shown in Figure 7, internal coil diameter is 2850mm, the coil total height is 950mm, coil total height and riser metal liquid aspect ratio are 0.8, and the spacing between every group of coil is 20mm, and clamps with asbestos board, induction coil rated input power 1300kW, inductor rated voltage 750V, transformer primary voltage 10000V, transformer secondary voltage 750V.Adopt around 12 groups of " Contraband " shape yoke 10 uniform induction coils.Along six groups of uniform yokes 10 of induction coil 5a circumferencial direction, wherein leave the gap between yoke 10 and the base 3, between the gap, fill adiabatic insulating materials.Yoke 10 is stacked by silicon steel sheet and forms, the cross sectional shape of yoke 10 is " Contraband " shape, it is fastening with the corrosion resistant plate clamping that its front cover corrosion resistant plate and silicon steel sheet contact portion separate the outside with micarex, is fixed on 4 support arms by Type of Welding, and support arm 4 is connected with base 3 by groove.Cooling water system 9 is connected with six groups of induction coil 5a, and thermocouple 11 coated outside corundum protection tubes are inserted in the molten metal of rising head, are wired to recording instrument without paper 12, can measure the temperature of rising head in the ingot solidification process.
Before ingot steel casting, by hanger 6, steel ingot rising head eddy-current heating and electromagnetic mixing apparatus are placed on ingot mould top, pour into a mould steel ingot then.After cast finishes, add heat preserving agent 8, then open cooling water system 9 and provide cooling water for this device, connect power frequency supply cabinet 7 again, make six groups of induction coil 5a carry out the thermal loss of rising head in the eddy-current heating compensation ingot solidification process to the rising head molten steel, and be rising head molten steel electromagnetic agitation, improved rising head molten steel flow regime, promote inclusion floating.Temperature thermocouple 11 is wrapped in the corundum protection tube that wall thickness is 5mm; be inserted among the steel ingot rising head molten steel; in the eddy-current heating process,, regulate the power control rising head process of setting that is input to six groups of induction coil 5a by power frequency supply cabinet 7 by the temperature of thermocouple 11 and recording instrument without paper 12 feedback steel ingot rising heads.After ingot solidification finished, powered-down was closed cooling water system 9 again after 10 minutes, by hanger 6 lifting steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, finished the lifting and the demoulding work of steel ingot again according to normal step.
Fig. 4 is steel ingot rising head eddy-current heating disclosed by the invention and electromagnetic mixing apparatus (four groups of coils of two-phase) structural representation, and 3 tons of the quality of steel ingot, material are the 0Cr13Ni4Mo stainless steel, 1550 ℃ of pouring temperatures.Steel ingot rising head weight is 0.5 ton, rising head lower surface diameter 550mm, rising head upper surface 500mm, riser height 320mm.It is 80mm that riser head heat-preserving overlaps 2 wall thickness, and riser head heat-preserving cover 2 is made by refractory brick, is fastened on the supporting construction, and base 3 sidewall outer surfaces are symmetrical arranged hanger 6.On base 3, place riser head heat-preserving cover 2, four groups of induction coil 5b are placed in outside at riser head heat-preserving cover 2, there is not ferrimagnet between 2 and four groups of induction coil 5b of riser head heat-preserving cover, four groups of induction coil 5b are by odd-shaped cross section pure copper tube dish curl, near emitting the pipe thickness d of oral-lateral is 15mm, and its outer surface is surrounded by mica tape, scribbles insulated paint between the copper pipe, per two groups of coils series connection is received three phase worker power cabinet 7 by water-cooled cable among four groups of induction coil 5b.The mode of connection of four groups of induction coil 5b and power supply is the circuit connecting of four groups of coils of two-phase shown in Figure 8, internal coil diameter is 750mm, the coil total height is 285mm, coil height and riser metal liquid aspect ratio are 0.9, spacing between every group of coil is 25mm, induction coil rated input power 100 kW, inductor rated voltage 380V.Adopt around 12 groups of " Contraband " shape yoke 10 uniform induction coil 5b.The other parts of embodiment 2 are identical with embodiment 1.
Claims (9)
1. steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, comprise base (3), support arm (4), many group induction coils (5), thermocouple (11) and recording instrument without paper (12), the outer surface of described base (3) sidewall is symmetrical arranged hanger (6), it is characterized in that: build into riser head heat-preserving cover (2) by laying bricks or stones with flame-proof thermal insulation material on the described base, muff (2) external vertical is placed many group induction coils (5), many group induction coils (5) are connected to three phase worker power cabinet (7) by water-cooled cable, many group induction coils (5) adopt six groups of three-phases or two-phase four winding methods with the mode of connection of power supply, along the circumferential direction go up uniform yoke (10) in many group induction coils (5) outside, yoke (10) outside uses corrosion resistant plate to come clamping and fastening, described corrosion resistant plate is welded on the support arm (4), support arm (4) is fixed in the groove of base (3), cooling water system (9) is connected with many group induction coils (5), by cooling water many groups induction coil (5) is cooled off.
2. steel ingot rising head eddy-current heating according to claim 1 and electromagnetic mixing apparatus, it is characterized in that: the structure of described many group induction coils (5) is identical, by odd-shaped cross section pure copper tube dish curl, near the pipe thickness d=10-20mm that emits oral-lateral, described many group induction coil (5) outer surfaces are surrounded by mica tape, and scribble insulated paint.
3. steel ingot rising head eddy-current heating according to claim 1 and 2 and electromagnetic mixing apparatus is characterized in that: the aspect ratio of described many group induction coil (5) total heights and riser metal liquid is between 0.5-0.9.
4. steel ingot rising head eddy-current heating according to claim 1 and electromagnetic mixing apparatus, it is characterized in that: described yoke (10) is stacked by silicon steel sheet and forms, the cross sectional shape of yoke is " Contraband " shape, its front cover corrosion resistant plate and silicon steel sheet contact portion separate with micarex, use the micarex consolidation between yoke (10) and the many group induction coils (5), to reduce the coil vibration, avoid damaging the insulating barrier of induction coil.
5. according to claim 1 or 4 described steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, it is characterized in that: the material of described base (3) is a stainless steel, leaves the gap between yoke (10) and the base (3), and fills adiabatic insulating materials between the gap.
6. steel ingot rising head eddy-current heating according to claim 1 and electromagnetic mixing apparatus, it is characterized in that: described riser head heat-preserving cover (2) is assembled by refractory brick and heat-insulating shield and is fastened on the supporting construction, the wall thickness of riser head heat-preserving cover (2) is 80-200mm, and does not have ferrimagnet between many groups induction coil (5).
7. steel ingot rising head eddy-current heating according to claim 1 and electromagnetic mixing apparatus; it is characterized in that: described thermocouple (11) is wrapped in the corundum protection tube; be inserted in the molten metal of rising head, connect the temperature of recording instrument without paper (12) record rising head molten steel by lead.
8. steel ingot rising head eddy-current heating according to claim 1 and 2 and electromagnetic mixing apparatus, it is characterized in that: described many group induction coils (5) can adopt six groups of induction coils vertically to be placed on riser head heat-preserving cover (2) outside, six groups of per two groups of coils series connection of induction coil, receive three phase worker power cabinet (7) by water-cooled cable, the mode of connection of six groups of induction coils adopts six groups of coil connections of three-phase; Also can adopt four groups of induction coils vertically to be placed on riser head heat-preserving cover (2) outside, per two groups of coils series connection is received three phase worker power cabinet (7) by water-cooled cable, and the mode of connection of four groups of induction coils adopts four groups of coil connections of two-phase.
9. steel ingot rising head eddy-current heating according to claim 1 and electromagnetic mixing apparatus is characterized in that: described cooling water system (9) is provided with temperature measuring equipment for many group induction coils (5) provide cooling water at delivery port, requires leaving water temperature not to be higher than 55 ℃.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158841.0A CN103212675B (en) | 2013-05-03 | 2013-05-03 | Steel ingot feeder head induction heating and electromagnetic stirring device |
| PCT/CN2014/076521 WO2014177052A1 (en) | 2013-05-03 | 2014-04-29 | Induction heating and electromagnetic stirring device for riser head of steel ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158841.0A CN103212675B (en) | 2013-05-03 | 2013-05-03 | Steel ingot feeder head induction heating and electromagnetic stirring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103212675A true CN103212675A (en) | 2013-07-24 |
| CN103212675B CN103212675B (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310158841.0A Expired - Fee Related CN103212675B (en) | 2013-05-03 | 2013-05-03 | Steel ingot feeder head induction heating and electromagnetic stirring device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103212675B (en) |
| WO (1) | WO2014177052A1 (en) |
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| CN104259441A (en) * | 2014-09-22 | 2015-01-07 | 辽宁科技大学 | Method for casting large-sized steel ingot with internally arranged cold core and top arranged electromagnetic field |
| CN104826997A (en) * | 2015-04-20 | 2015-08-12 | 沈阳工业大学 | Casting riser induction heating device, and casting riser induction heating method |
| CN105263651A (en) * | 2014-02-11 | 2016-01-20 | 陕西有色天宏瑞科硅材料有限责任公司 | Method and apparatus for consolidation of granular silicon and measuring non-metals content |
| CN106734932A (en) * | 2016-12-30 | 2017-05-31 | 大连船用推进器有限公司 | Large-scale marine propeller casts rising head induction heating apparatus |
| CN110686510A (en) * | 2019-10-16 | 2020-01-14 | 山东大学 | Inductor structure and electromagnetic stirring smelting pot |
| CN110923400A (en) * | 2019-12-17 | 2020-03-27 | 广德因达电炉成套设备有限公司 | Heating, tempering and stirring device of molten metal treatment furnace |
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| CN109967722A (en) * | 2019-03-31 | 2019-07-05 | 唐山学院 | The method and device of riser feeding is carried out to large-scale casting ingot using pulse electromagnetic field |
| CN115351245A (en) * | 2022-07-27 | 2022-11-18 | 江苏远航精密合金科技股份有限公司 | Method for improving yield of high-purity nickel ingot casting material for electronic industry |
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Also Published As
| Publication number | Publication date |
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| CN103212675B (en) | 2015-03-18 |
| WO2014177052A1 (en) | 2014-11-06 |
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