CN203235929U - Induction heating and electromagnetic stirring device for riser of steel ingot - Google Patents
Induction heating and electromagnetic stirring device for riser of steel ingot Download PDFInfo
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- CN203235929U CN203235929U CN 201320232783 CN201320232783U CN203235929U CN 203235929 U CN203235929 U CN 203235929U CN 201320232783 CN201320232783 CN 201320232783 CN 201320232783 U CN201320232783 U CN 201320232783U CN 203235929 U CN203235929 U CN 203235929U
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Abstract
The utility model discloses an induction heating and electromagnetic stirring device for a riser of a steel ingot. The induction heating and electromagnetic stirring device for the riser of the steel ingot can be used for heating, heat preservation and electromagnetic stirring of risers of ingots of ferrous metal materials and non-ferrous metal materials. According to the induction heating and electromagnetic stirring device for the riser of the steel ingot, a plurality of sets of induction coils (5) are perpendicularly placed outside a riser heat preservation sleeve (2) of the steel ingot, the induction heating and electromagnetic stirring device is connected with a three-phase power frequency power supply cabinet (7) through water-cooling cables, and magnet yokes (10) are evenly distributed outside the induction coils (5) in the peripheral direction. When a power source is connected, a magnetic field is formed at the periphery of the riser of the steel ingot, induction heating is carried out liquid steel of the riser, heat loss of the riser is compensated in the process of solidification of the steel ingot, the progress of solidification of the riser is delayed, and the feeding capacity of the riser is improved. Meanwhile, a metal melt body plays a role in electromagnetic stirring under the action of the magnetic field, circulation that liquid metal in the center of the steel ingot moves upwards, and the external liquid metal moves downwards is formed, and removal of gas and inclusions in the metal melt body is facilitated. Two physical processes are in interaction, the frequency of the phenomena of center porosity and segregation is avoided, and quality of the steel ingot is improved.
Description
Technical field
The utility model relates to metallurgy and machinery manufacturing industry, a kind of device that is applicable to be used in the large-scale steel ingot production steel ingot rising head eddy-current heating and electromagnetic agitation 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 Riser Dimensions, improve the degree of purity of steel ingot ingot body.
Background technology
Development along with China's weight equipment, metallurgy, thermoelectricity, Nuclear Electricity, more and more stricter to the large forgings quality requirement, large-scale steel ingot is as the raw material of forging, its quality directly affects 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 and porosity in the steel ingot, the 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, the technology such as the existing electric heating rising head in industrial ingot field, these prior aries are incubated riser heating by methods such as electric arc, plasma or chemical heat, compensation rising head thermal loss, improve the feeding capacity of rising head, but above-mentioned technology Shortcomings part, the heat of input mainly concentrates near the calandria, has that heating surface (area) (HS is little, the thermal efficiency is low and pollutes the problem such as molten steel.
Chinese patent (CN102350485A) discloses a kind of medium-frequency electrical heating billet steel cast shrinkage hole compensation device and technique.This patent scope of application is not for 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 magnetic fields, 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 the floating of field trash, it is inner that the field trash that also easily will float is rolled into the ingot body again, reduces the degree of purity of steel ingot.It should further be appreciated that simultaneously: the used medium-frequency electrical heating device 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
The deficiency and the defective that exist in order to overcome existing ingot casting technology, the utility model provides a kind of steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, this utility model 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 scheme that its technical problem that solves the utility model adopts is: described steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, and comprise base, support arm and organize induction coil more, 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, many group induction coils outside is gone up uniform yoke in the circumferential direction of the circle, 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.
In the utility model, 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 of rising head side, described many group induction coil outer surfaces are surrounded by mica tape, and scribble insulated paint.
In the utility model, described steel ingot rising head eddy-current heating and electromagnetic mixing apparatus, supply frequency is power frequency, and electromagnetic agitation is strong, under function composite by electromagnetic stirring, the molten steel rolling on upper plane can produce hump, floating field trash is brought in the molten steel, for reducing hump height, so that the rolling of the molten steel on upper plane is comparatively steady, 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.
In the utility model, 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, to reduce the coil vibration, avoid damaging the insulating barrier of induction coil.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 again the sensed heating of ingot body swage and heats up.
In the utility model, described base material is stainless steel, leaves the gap between yoke and the base, and fills adiabatic insulating materials and carry out insulation processing in the gap.
In the utility model, 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 the riser head heat-preserving cover has the hydrostatic pressure of sufficient intensity opposing rising head molten steel, guarantees between riser head heat-preserving cover and the induction coil simultaneously without ferrimagnet.
In the utility model; 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; feedback is emitted the temperature-fall period of port part, regulates the input power control rising head process of setting of power frequency supply according to feedack.
In the utility model, adopt six groups of induction coils vertically to be placed on the rising head flame-proof thermal insulation material outside, six groups of induction coils, per two groups of coils series connection, receive the three phase worker power cabinet 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 the 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.
In the utility model, 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 utility model adopts power frequency supply, the heat that produces 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 larger, the volume of eddy-current heating is also just larger, 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 large, take 1550 ℃ of carbon steels as 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 utility model is owing to adopting the polyphase windings coil to receive three phase worker power, coil can form magnetic field behind the plugged, this magnetic field type is different from the magnetic field type that the single phase winding winding of Frequency Induction Heating forms, molten steel is under this magnetic fields, the centre molten metal moves upward, external metallization liquid moves downward, so that the inner circulation that forms integral body of metal bath, field trash fully floats under the drive of the upwelling at molten steel center, be conducive to like this reduce the field trash of ingot body inside, improve ingot quality.
Heating, the intensity of stirring and the heating rate of molten steel of the utility model in the eddy-current heating process can be controlled by the power of the power frequency supply of inputting induction coil fully.
The utlity model has following beneficial effect: the utility model belongs to eddy-current heating, and 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 large, and the thermal efficiency is high.By induction coil to rising head molten steel eddy-current heating, the thermal loss of rising head in the compensation During Ingot Solidification, the setting time that prolongs the rising head molten steel guarantees that rising head has enough molten steel to the ingot body feeding of steel ingot, be conducive to reduce the rising head proportion, improve the steel ingot utilization rate.Electromagnetic stirring force in the molten steel and the square root of supply frequency are inversely proportional to, the lower mixing power of frequency is larger, therefore adopt power frequency to form the motion state that large electromagnetic stirring force accelerated and changed melt, the high-temperature fusant that this motion is conducive to 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 produces on the other hand produces mechanical shear stress to the dendrite of growth, make dendrite fracture, prevented that like this dendritic arm is interlaced, cross-over connection, guarantee the unobstructed of Feeding channel, effectively exempted from the formation of secondary pipe.Adopt eddy-current heating, reduce the speed of the drop in temperature of rising head molten steel, for providing of inclusion floating favourable temperature conditions, simultaneously, the utility model adopts many group induction coils to be connected to three phase worker power, behind plugged, coil forms magnetic field, and molten steel produces the electromagnetic agitation effect under this magnetic fields, so that the centre molten metal moves upward, external metallization liquid moves downward, form whole circulation, under the drive of center molten steel upwelling, impel gas in the melt and the abundant floating of inclusion particle, reduce the field trash in the molten steel, improve ingot quality.The utility model adopts power frequency supply, and equipment is simple easily to be realized, need not variable-frequency power sources, can be adapted to the Heat preservation 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 top 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
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 3 is the structural representation of the utility model disclosed steel ingot rising head eddy-current heating 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.Place riser head heat-preserving cover 2 at base 3, six groups of induction coil 5a are placed in outside at riser head heat-preserving cover 2, riser head heat-preserving overlaps between 2 and six groups of induction coil 5a without ferrimagnet, six groups of induction coil 5a are by odd-shaped cross section pure copper tube dish curl, pipe thickness d near the rising head side 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 During Ingot Solidification.
Before ingot steel casting, by hanger 6, steel ingot rising head eddy-current heating and electromagnetic mixing apparatus are placed on ingot mould top, then pour into a mould steel ingot.After being poured, add heat preserving agent 8, then open cooling water system 9 and provide cooling water for device of the present utility model, connect again power frequency supply cabinet 7, so that six groups of induction coil 5a carry out the thermal loss that eddy-current heating compensates rising head in the During Ingot Solidification to the rising head molten steel, and be rising head molten steel electromagnetic agitation, improved the rising head steel liquid flow state, 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, by the temperature of thermocouple 11 and recording instrument without paper 12 feedback steel ingot rising heads, 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.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 lifting and the demoulding work of steel ingot according to normal step again.
Fig. 4 is the utility model disclosed steel ingot rising head eddy-current heating 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.Place riser head heat-preserving cover 2 at base 3, four groups of induction coil 5b are placed in outside at riser head heat-preserving cover 2, riser head heat-preserving overlaps between 2 and four groups of induction coil 5b without ferrimagnet, four groups of induction coil 5b are by odd-shaped cross section pure copper tube dish curl, pipe thickness d near the rising head side 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. a 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: described base (3) is upper builds into riser head heat-preserving cover (2) by laying bricks or stones with flame-proof thermal insulation material, described 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, go up in the circumferential direction of the circle uniform yoke (10) in many group induction coils (5) outside, clamping and fastening is come with corrosion resistant plate in yoke (10) outside, 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, pipe thickness d=10-20mm near the rising head side, 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: organize the aspect ratios of induction coil (5) total heights and riser metal liquid described between 0.5-0.9 more.
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 (10) 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 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 between many groups induction coil (5) without ferrimagnet.
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 wire.
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 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320232783 CN203235929U (en) | 2013-05-03 | 2013-05-03 | Induction heating and electromagnetic stirring device for riser of steel ingot |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320232783 CN203235929U (en) | 2013-05-03 | 2013-05-03 | Induction heating and electromagnetic stirring device for riser of steel ingot |
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| CN203235929U true CN203235929U (en) | 2013-10-16 |
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| CN 201320232783 Expired - Fee Related CN203235929U (en) | 2013-05-03 | 2013-05-03 | Induction heating and electromagnetic stirring device for riser of steel ingot |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212675A (en) * | 2013-05-03 | 2013-07-24 | 燕山大学 | Steel ingot feeder head induction heating and electromagnetic stirring device |
| CN107421328A (en) * | 2017-06-13 | 2017-12-01 | 石家庄爱迪尔电气有限公司 | Heating seethes rabble furnace with stirring interlock type electromagnetism |
-
2013
- 2013-05-03 CN CN 201320232783 patent/CN203235929U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212675A (en) * | 2013-05-03 | 2013-07-24 | 燕山大学 | Steel ingot feeder head induction heating and electromagnetic stirring device |
| CN107421328A (en) * | 2017-06-13 | 2017-12-01 | 石家庄爱迪尔电气有限公司 | Heating seethes rabble furnace with stirring interlock type electromagnetism |
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