CN1092466C - Composite electromagnetic inductor for electromagnetic casting - Google Patents
Composite electromagnetic inductor for electromagnetic casting Download PDFInfo
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- CN1092466C CN1092466C CN 97112897 CN97112897A CN1092466C CN 1092466 C CN1092466 C CN 1092466C CN 97112897 CN97112897 CN 97112897 CN 97112897 A CN97112897 A CN 97112897A CN 1092466 C CN1092466 C CN 1092466C
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Abstract
The present invention relates to a composite electromagnetic inductor for electromagnetic casting, which belongs to the field of heat processing. The present invention which is formed by combining an electromagnetic inductor and permeability magnetic materials comprises a main coil (6), a cooling water chamber (9) and a shielding cover (3). The present invention is characterized in that the composite electromagnetic inductor for electromagnetic casting also comprises an upper compound coil (5), a lower permeability magnetic composite coil (8) and an outside permeability magnetic composite coil (7), wherein the upper permeability magnetic composite coil (5), the lower permeability magnetic composite coil (8) and the outside permeability magnetic composite coil (7) are made of high permeability magnetic materials and are arranged outside the main coil; insulating substances (2) are arranged among the permeability magnetic composite coils, the main coil and a block (11). The present invention has the advantages that magnetic resistance is reduced, and the magnetic field is enhanced so that electromagnetic casting under low current and low energy consumption is realized, and the energy consumption is reduced by more than 300%; the relative positions of the permeability magnetic composite coils are regulated so that the magnetic field of a photosensitive area is enhanced, and the magnetic field in a crystallizer is even.
Description
The present invention relates to induction melting, electromagnetic agitation and heat treated induction heating technique in electromagnetic casting, the casting smelting process, belong to the hot working field.
Electromagnetic casting is called for short EMC (Electromagnetic Casting), is by the no mould semi-continuous casting technology of The former Russian scholar Getselev in the invention sixties.Its principle is to replace crystallizer with electromagnetic inductor, when feeding alternating current in the inductor, produces alternating electromagnetic field
, the action of a magnetic field forms induced current in liquid metals
With
Interact, produce inside electromagnetic force
The confine liquids metal forms the cylinder that partly suspends.Water spray cooling below electromagnetic inductor, top fill liquid metal because casting machine drags bed die and descends with certain speed, forms the continuous casting process.The EMC method is compared with common continuous casting (DC method), have great advantage: 1., do not contact with crystallizer owing to the constraint compacted under of liquid metal in the electromagnetic casting in electromagnetic force, so, liquid metals water-cooled under the state of Free Surface is forced and is solidified, and the surface smoothness of ingot casting can reach
7～
8This has just eliminated the DC method, and intrinsic draw, scratch defective, therefore, further can not mill face or mill face less before the processing, the ingot casting that adopts the DC method to produce then will mill face 5～15mm, this has just reduced operation, greatly reduces the energy and raw-material consumption, 2. because there is function composite by electromagnetic stirring in EMC, so, the dense internal organization of ingot casting, even, mechanical performance increases substantially, 3. because containerless casting, so cancelled complicated vibration and lubricating system, reduced equipment investment, simplified technology, made electromagnetic casting that great economic implications be arranged.
The electromagnetic casting technology is applied in the production of aluminium and aluminium alloy the earliest, and its technology with the U.S., Germany and Switzerland etc. is the most advanced.The annual aluminium alloy of producing with the EMC method is more than 2,000,000 tons, and this has shown the vigorous pace that replaces the DC method.
Can this electromagnetic casting technology of non-ferrous metal be applied to the electromagnetic casting of steel, the focus that this has become people is paid close attention to, but still do not have the report of practical steel electromagnetic casting technology up to now.This is because the difficult point of steel EMC is: 1. density is big, is 3 times of aluminium approximately, needs very high magnetic pressure molding, and 2. conductivity is low, only be 1/6 of aluminium, and the depth of penetration is big, under identical power parameter, the induced current density that the molten steel surface forms is little, and electromagnetic push is also little.Therefore, if adopt existing electromagnetic inductor to need very high electric current.For example, only consider from the angle of density that form the high metal fluid column of 50mm, aluminium needs the magnetic flux density of 54mT, steel then is 92mT, is 1.7 times of aluminium approximately.If other factors such as comprehensive electromagnetism rates, can know steel by inference approximately need be in the inductor current of aluminium EMC more than 4.4 times, and promptly about 20000A, energy consumption is huge.Russia scholar Л e щ к o в. в. Л adopts the power supply of 150～250KW to produce the round base of Φ 300mm, and energy consumption is near 10 times of aluminium, and this is difficult to accept in actual production.After the comprehensive assessment, many scholars think that the electromagnetic casting of steel is valueless at all, therefore, then energy are concentrated in the research of cold crucible method.The cold crucible method promptly is evenly to cut several micro gaps (being generally 0.1mm) on common continuous cast mold, induction coil is placed in the outside, apply the electromagnetic field of high frequency, produce vortex flow in the crystallizer and will produce inside electromagnetic push on the molten steel surface, make steel billet realize " the soft contact " with crystallizer wall, the influence of mechanical oscillation has been offset in the vibration of high frequency magnetic field simultaneously, thereby has improved the continuous casting steel billet surface quality.But this method energy consumption is big, the improvement of surperficial matter is not fairly obvious yet, therefore, the EMC technology is applied to the production of steel, is a difficult problem, has become the key issue that people are badly in need of solving.
Existing electromagnetic casting technology exists the big fundamental cause of energy consumption to be: existing electromagnetic inductor is a single-turn circular coil, the industrial electromagnetic forming method that is mainly circle cross section or rectangular cross section, and coil is the rectangular tube or the copper belt of red copper.The magnetic loop of system is made of the nonmagnetic substance of liquid metals, air and insulation, by the Ohm's law of magnetic circuit as can be known, and magnetic flux density Φ and turn number N, inductor current I and loop magnetic resistance R
mThe pass be:
And
In the formula: 1 is the magnetic circuit average length, and μ is a magnetic permeability, and s is the magnetic circuit sectional area.And at high temperature, the magnetic permeability of liquid metals approaches the magnetic permeability (μ of vacuum
0=4 π * 10
-7H/m), therefore, make the magnetic resistance R in the whole loop that inductor one ingot casting forms
mVery big, magnetic flux density Φ is less, so prior art can not realize the electromagnetic casting to steel.
In addition, 10% the effective power of only having an appointment in aluminium, the copper electromagnetic casting is used for actual electromagnetic casting process, 90% loss that is consumed in system.Therefore, under the condition that does not change inductor current, reduce the magnetic resistance R of system circuit
m, can increase the useful flux in the inductor.Simultaneously, if adopt special material, produce complementary field under the exciting in former magnetic field magnetic field is strengthened, this is expected to be issued to needed magnetic field condition in little current condition, realizes the electromagnetic casting of aluminium, copper and steel.
Purpose of the present invention and task are: 1. overcome prior art and be used for aluminium, its magnetic resistance of copper alloy is big, the deficiency that energy consumption is big, to studies show that of aluminium alloy, only have an appointment 10% effective power of common electrical magnetic inductor acts in the actual casting process, 90% is consumed in the loss of system, 2. overcome and be difficult to the deficiency accepted for people in the actual production that prior art is applied to steel EMC, and provide a kind of and can reduce magnetic resistance, strengthen magnetic field, make EMC can be used for the actual production of steel, simultaneously, make existing aluminium and the aluminium alloy of producing with EMC, the technical measures that the energy consumption of copper alloy greatly reduces, special proposition technical solution of the present invention.
Basic design of the present invention is: produce as main coil with the electromagnetic inductor of original coil and excite magnetic field, replace the magnetic conductor that is designed by the occupied space of air with high permeability material and constitute the NEW TYPE OF COMPOSITE electromagnetic inductor; Magnetic conductor has reduced the magnetic resistance of magnetic circuit, simultaneously, according to the mirror image theory of electromagnetic field, magnetic conductor and main coil is constituted compound interface, produces complementary field; Complementary field and former magnetic field superposition strengthen the effective magnetic field in the inductor greatly, and the fluid column width is reduced, and highly increase, and realize the electromagnetic casting of steel under little electric current, the low energy consumption condition; And be applied to the electromagnetic casting of other alloys such as aluminium, copper, can reduce inductor current greatly, save the energy; The thickness of structure, relative position or insulant by changing main coil and magnetic conductor can strengthen and regulate whole magnetic field intensity and distribution.
The composite electromagnetic inductor for electromagnetic casting that the present invention is designed, it is to be made of electromagnetic inductor and the compound institute of permeability magnetic material, it comprises main coil [6], cooling water chamber [9], radome [3], and it is characterized in that: it also comprises: be provided with the last magnetic conductor of manufacturing with the akin high permeability material of main coil [6] electromagnetic inductor shape [5], following magnetic conductor [8], outside magnetic conductor [7] or whole magnetic conductor [12] in top, bottom and the outside portion of main coil [6]; Between last magnetic conductor [5] and main coil [6] and outside magnetic conductor [7], between following magnetic conductor [8] and main coil [6] and the outside magnetic conductor [7], between outside magnetic conductor [7] and the main coil [6], be added with the insulant [2] that insulating material constitutes.
Of the present invention being further characterized in that: go up magnetic conductor [5], following magnetic conductor [8], outside magnetic conductor [7], whole magnetic conductor [12], can be constituted by a plurality of blockss [11], and between each blocks [11], be added with insulant [2]; Last magnetic conductor [5], following magnetic conductor [8], outside magnetic conductor [7], whole magnetic conductor [12] can be designed to annular solid, square body, cuboid or shaped body; Be the height of control metal fluid column and the radius of curvature at its top, the medial surface of last magnetic conductor [5] and the angle β between horizontal plane are 90 °～30 ° angles, are generally 90 °, 75 °, and 60 ° or 45; Last magnetic conductor [5], the relative distance d of the medial surface of following magnetic conductor [8] and main coil [6] its horizontal direction of medial surface is-50mm≤d≤2000mm to be generally 0mm or 2mm or 5mm or 10mm, with magnetic field intensity in the crystallization control device and uniformity; The thickness δ of insulant [2] is 0≤δ≤50mm, is generally δ≤0.1mm; Last magnetic conductor [5], down magnetic conductor [8], outside magnetic conductor [7] can separately and main coil [6] electromagnetic inductor be used or be used with main coil [6] electromagnetic inductor behind various combination; The last magnetic conductor [5] that high permeability material of the present invention is manufactured, outside magnetic conductor [7], following magnetic conductor [8] and whole magnetic conductor [12] are to be manufactured greater than the permeability magnetic material of permeability of vacuum by magnetic permeability, use F usually
E, CO, Ni and alloy thereof, silicon steel and Ferrite Material make; Main coil of the present invention [6] electromagnetic inductor is to be manufactured greater than the material of steel by permeability, manufactures with Al, Cu and superconductor usually; Insulant among the present invention [2] is greater than 10 by insulation resistance
4The insulating material of Ω is manufactured, and is generally insulating paper (comprising cardboard), oilpaper, varnished cloth or band, insulating varnish, film, mica and various silk cloth etc.
The composite electromagnetic inductor of the technology of the present invention, can be applied to electromagnetism melting, electromagnetic agitation, the electromagnetic casting of ferrous metal such as steel, iron and alloy thereof, the production that can produce various steel billets such as 25 steel, 45 steel, 16Mn, 15MnV, 40Cr, 35GrMo, GCr15, CrWMn, T8; Can be applied to electromagnetism melting, electromagnetic agitation, the electromagnetic casting of aluminium, copper and alloy thereof, can produce the various trades mark such as 3004,5182,2024,6063,7075 aluminium alloy, can be applicable to the continuous casting electromagnetic of steel, i.e. cold crucible foundry engieering; Can be applied to the induction heating technique of metal heat treatmet.
The basic equipment that electromagnetic casting is adopted comprises: power supply, induction hardening transformer, electromagnetic inductor, radome, cooling water chamber, melting furnace, running gate system and throwing system.In the said equipment, electromagnetic inductor is the device of the moulding of relying of key.In order to shorten by inductor, system's magnetic circuit that metal fluid column and environment form partly suspends, minimizing system magnetic resistance, and produce excitation electromagnetic field, original system magnetic field is strengthened, adjustment simultaneously, controlling magnetic field distribute, keep the balance between liquid metals static pressure and electromagnetic pressure, and it is mobile to suppress liquid metals, keeps fluid column stable, in electromagnetic inductor, be provided with magnetic conductor, can significantly reduce the consumption of the inductor operating current and the energy.Electromagnetic inductor is the middle and high frequency alternating current of accepting by induction hardening transformer output, produces alternating electromagnetic field, makes the molten metal of cast form the metal fluid column that partly suspends.
The composite electromagnetic inductor system, the technological process of electromagnetic casting is: 1. adjust electromagnetic inductor, radome, the level of cooling water chamber and bed die and relative position, 2. bed die is risen up in the inductor, make its end face be positioned at inductor main coil and following magnetic conductor intersection, 3. start power supply, and adjust power, electromagnetic parameter such as frequency and inductor current is to setting, 4. pour into a mould liquid metals in bed die, the height when the metal fluid column that partly suspends that forms reaches setting (when being generally 30～40mm), open the throwing system, make casting speed carry out the transition to normal value gradually by certain pattern, 5. after entering the stabilization sub stage in the casting process, it is constant that casting speed keeps substantially, at this moment, want strict control poring rate, itself and casting speed are complementary to keep fluid column constant, finish until casting.
Major advantage of the present invention: 1. owing to adopt high permeability material to make, the outside, down with whole magnetic conductor [5], [7], [8], [12], thereby reduced the magnetic resistance of system circuit, and produce powerful electromagnetic field, the useful flux of inductor is strengthened greatly, therefore, under the condition of the electric current that does not change existing inductor, can realize little electric current, the electromagnetic casting of low energy consumption steel, this has just improved the surface quality of steel billet on the one hand, eliminate the various defectives that cause because of the surface quality difference in the operation of rolling, simultaneously, because function composite by electromagnetic stirring, solidified structure that can the refinement steel billet, make its densification, evenly and reduce segregation, increase substantially mechanical performance, on the other hand, because mould-free forming, complicated vibration and lubricating system have been cancelled, its economic benefit is self-evident, 2. the technology of the present invention still can be used for aluminium, the electromagnetic casting of copper and alloy thereof, at this moment, can greatly reduce the electric current of inductor, thereby cut down the consumption of energy significantly, general energy can reduce more than 300%, 3. the designed composite electromagnetic inductor for electromagnetic casting of the technology of the present invention can be used for the continuous casting electromagnetic of multiple ingot shape steel billet, probes into the degree of depth relatively by what adjust each magnetic conductor, make respond to the zone of interest magnetic field intensity increase, make the magnetic field uniformization in the crystallizer.
Further specify detail of the present invention below in conjunction with accompanying drawing:
Fig. 1 is an electromagnetic casting system configuration schematic diagram of the present invention.
Show among the figure that electromagnetic casting is realized by the composite electromagnetic inductor for electromagnetic casting that top, outside portion and bottom design in main coil [6] have last magnetic conductor [5], outside magnetic conductor [7] and following magnetic conductor [8] to be constituted.Be provided with plate washer [1] in order to be fastened on its outside, the bottom is provided with cooling water chamber [9], at its main coil [6] and last magnetic conductor [5], outside magnetic conductor [7], down between the magnetic conductor [8] and between upper and lower and the outside magnetic conductor [5,8,7], all is added with insulant [2].Molten metal [4] forms half column of suspension under the effect of composite electromagnetic inductor for electromagnetic casting and radome [3], this fluid column forms ingot casting [10] through the cooling of cooling water chamber [9] water spray.The direction of arrow is motion (the being throwing) direction of ingot casting [10].The size at β angle requires to determine according to the radian of metal bath surface.
Fig. 2 is the designed composite electromagnetic inductor for electromagnetic casting plan structure schematic diagram of the present invention.
Showing among the figure that composite electromagnetic inductor for electromagnetic casting is a circulus, is to be composited by main line figure [6] and last magnetic conductor [5], outside magnetic conductor, following magnetic conductor.C-C is a section symbols.
Fig. 3 is that the C-C of Fig. 2 is a cross-sectional view.
Be presented at top, outside portion and the bottom of main coil [6] among the figure, design has last magnetic conductor [5], outside magnetic conductor [7] and following magnetic conductor [8] respectively, all is added with insulant [2] between them.The β angle becomes 90 °
Fig. 4 is the plan structure schematic diagram of the electromagnetic inductor (being main coil [6]) that prior art adopted.A-A is section symbols and direction.
Fig. 5 is the A-A portion face structural representation of Fig. 4, the same Fig. 4 of symbol.
Fig. 6 is the plan structure schematic diagram of the designed a kind of ring-like upper and lower magnetic conductor of the present invention.They respectively are made up of 8 camber shape bodies [11].All be added with insulant [2] between each blocks [11], C-C is section symbols and direction.
Fig. 7 is the C-C cross-sectional view of Fig. 6, all same Fig. 6 of its symbol.
Fig. 8 is the schematic top plan view of the designed upper and lower magnetic conductor of a kind of square type of the present invention.They respectively are made up of the block [11] of 8 square types, 8 ladder types.All be added with insulant [2] between each blocks [11], B-B is section and direction.
Fig. 9 is the B-B cross-sectional view of Fig. 8.All same Fig. 8 of symbol among the figure.
Figure 10 is the designed a kind of annular outside magnetic conductor schematic top plan view of the present invention.
Show among the figure that all be added with insulant [2] between by 8 camber blocks [11], A-A is section symbols and direction.
Figure 11 is the A-A cross-sectional view of Figure 10.The all same Figure 10 of symbol.
Figure 12 is the designed a kind of square type outside magnetic conductor plan structure schematic diagram of the present invention.
Show among the figure that at the outside magnetic conductor of being made up of the blocks [11] of 7 square types and 8 ladder type shapes, all be added with insulant [2] between its each blocks [11], B-B is section symbols and direction.
Figure 13 is the B-B cross-sectional view of Figure 12.All same Figure 12 of symbol among the figure.
Figure 14 is that this its β angle of last magnetic conductor [5] of sending out designed is less than 90 °
Among the figure and symbol [6] be main coil.B-B is section symbols and direction.
Figure 15 is the B-B cross-sectional view of Figure 14.
Show among the figure that the β angle of last magnetic conductor [5] all is added with insulant [2] less than 90 ° between each magnetic conductor and between each magnetic conductor and the main coil [6].The internal diameter of following magnetic conductor [8] and last magnetic conductor [5] is less than the internal diameter of main coil [6].
Figure 16 is the plan structure schematic diagram that its designed outside magnetic conductor of the present invention and main coil [6] have the composite electromagnetic inductor for electromagnetic casting of α obliquity structure.
Symbol [5] is gone up magnetic conductor, and D-D is section symbols and direction.
Figure 17 is the D-D cross-sectional view of Figure 16.
Demonstrate among the figure, main coil [6] and outside magnetic conductor all with its center line tilt alpha angle.Between them and they with last magnetic conductor [5] and time magnetic conductor between, all be added with insulant [2].
Figure 18 is the designed a kind of upper and lower and outside magnetic conductor of the present invention, the plan structure schematic diagram of the composite electromagnetic inductor for electromagnetic casting of being formed by 8 camber blocks [11].Between each block [11], add insulant [2].Symbol among the figure [6] circle of serving as theme, A-A is section symbols and direction.
Figure 19 is the A-A cross-sectional view of Figure 18.
Show among the figure that its internal diameter of upper and lower magnetic conductor [5,8] is all less than the internal diameter of main coil [6].All same Figure 18 of other symbols among the figure, and symbol [7] is an outside magnetic conductor.
Figure 20 is the cross-sectional view of the designed composite electromagnetic inductor for electromagnetic casting that is made up by main coil [6] and outside magnetic conductor [7] of the present invention.
The cross-sectional view of Figure 21 composite electromagnetic inductor for electromagnetic casting that to be the main coil [6] that has the α inclination angle made up with outside magnetic conductor [7].
Figure 22 is the cross-sectional view of the designed composite electromagnetic inductor for electromagnetic casting that is made up by main coil [6] and last magnetic conductor [5] of the present invention.
Figure 23 is the cross-sectional view that has the composite electromagnetic inductor for electromagnetic casting that is made up less than 90 ° last magnetic conductor [5] and main coil [6] at the β angle.
Figure 24 is by the cross-sectional view of internal diameter less than last magnetic conductor [5] with the combination composite electromagnetic inductor for electromagnetic casting of main coil [6] of main coil [6] internal diameter.
Figure 25 is the cross-sectional view of the designed composite electromagnetic inductor for electromagnetic casting that is made up by main coil [6] and following magnetic conductor [8] of the present invention.
Figure 26 is the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up less than the following magnetic conductor [8] of main coil [6] internal diameter and main line figure [6] by internal diameter.
Figure 27 is the cross-sectional view of the designed composite electromagnetic inductor for electromagnetic casting that is made up by main coil [6] and last magnetic conductor [5] and outside magnetic conductor [7] of the present invention.
Figure 28 is the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up less than 90 ° last magnetic conductor [5] and main coil [6] and outside magnetic conductor [7] by the β angle.
Figure 29 is the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up less than the last magnetic conductor [5] of main coil [6] internal diameter and main coil [6] and outside magnetic conductor [7] by internal diameter.
Figure 30 is the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that magnetic conductor [8] is made up under being reached by main coil [6], outside magnetic conductor [7].
The cross-sectional view of Figure 31 composite electromagnetic inductor for electromagnetic casting that to be internal diameter made up less than the following magnetic conductor [8] of main coil [6] internal diameter and main coil [6] and outside magnetic conductor [7].
Figure 32 is the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that magnetic conductor [8] was made up under the designed last magnetic conductor [5] of the present invention, main coil [6] reached.
Figure 33 is an internal diameter less than the last magnetic conductor [5] of main coil [6] internal diameter, the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up of magnetic conductor [8] and main coil [6] down.
Figure 34 has the β angle less than 90 ° last magnetic conductor [5] and main coil [6] and the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up of magnetic conductor [8] down.
Figure 35 be by last magnetic conductor [5] and its internal diameter of following magnetic conductor [8] all less than main coil [6] internal diameter, the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that is made up with main coil [6].Be that with Figure 33 difference the β angle of magnetic conductor [5] is less than 90 °
Figure 36 be the present invention designed by main coil [6] and last magnetic conductor [5], the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up of magnetic conductor [8] and outside magnetic conductor [7] down.
Figure 37 is the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up less than the last magnetic conductor [5] of main coil [6] internal diameter and following magnetic conductor [8] and outside magnetic conductor [7], main coil [6] by internal diameter.
Figure 38 is less than 90 ° last magnetic conductor [5] and main coil [6], outside magnetic conductor [7], the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up of magnetic conductor [8] down by the β angle.
Figure 39 is less than the last magnetic conductor [5] of main coil [6] internal diameter, the cross-sectional view of the composite electromagnetic inductor for electromagnetic casting that made up of magnetic conductor [8] and outside magnetic conductor [7], main coil [6] down by internal diameter.With Figure 37 difference at the β angle of magnetic conductor [5] thereon less than 90 °
Figure 40 is a composite electromagnetic inductor for electromagnetic casting, and the example of using in the cold crucible foundry engieering, this figure are its plan structure schematic diagrames.
Show among the figure, the outside in rectangular cold crucible [13], design has composite electromagnetic inductor for electromagnetic casting, and in the present embodiment, its height is identical with the cold crucible height, and magnetic conductor was all near cold crucible under main coil [6] and design last magnetic conductor [5] in the above reached.Outside magnetic conductor is then in the outside of main coil [6], and contour with it, last magnetic conductor [5], magnetic conductor, outside magnetic conductor down, and each constitutes by 4 bar shaped blockss [11].Symbol C-C is section and direction, and symbol [2] is an insulant.
Figure 41 is the C-C cross-sectional view of Figure 40.
Symbol [7], [8] and [9] are respectively outside magnetic conductor, following magnetic conductor and cooling water chamber.The same Figure 40 of other symbols.
Figure 42 be Figure 40 when adopting little cold crucible plan structure schematic diagram of when changing the cold crucible of different model (or).
In such cases, cold crucible [13] is put near main coil [6] center (also can be partial to a certain side), and the not change of the position of main line figure [6] and outside magnetic conductor, main coil [6] is apart from cold crucible [13] certain distance, last magnetic conductor [5], following magnetic conductor then probe into certain depth to the center, its objective is institute interesting areas magnetic field is strengthened, and obtain the distribution close, make crystallizer (being cold crucible [13]) internal magnetic field even with other each points.Between each blocks [11] and each magnetic conductor, be equipped with insulant [2], E-E is section symbols and direction.
Figure 43 is the E-E cross-sectional view of Figure 42.
Symbol among the figure [7], [8] and [9] are respectively outside magnetic conductor, following magnetic conductor and cooling water chamber, the same Figure 42 of other symbols.
Figure 44 is a composite electromagnetic inductor for electromagnetic casting in the cold crucible foundry engieering is used, the cross-sectional view when adopting whole magnetic conductor [12].
Show among the figure that the outside in cold crucible (being crystallizer) [13] is provided with composite electromagnetic inductor for electromagnetic casting.Be located at the main coil [6] of cold crucible [13] outside, its top, outside portion and bottom are all surrounded by whole magnetic conductor [12], and it is to adopt a plurality of blocks to constitute.Symbol [9], [2] are cooling water chamber and insulant.
Figure 45 is the plan structure schematic diagram of the composite electromagnetic inductor for electromagnetic casting of a kind of abnormally-structured form of designing of the present invention.
Demonstrating this among the figure abnormally-structured is the structure of one eight prismatic, last magnetic conductor [5] is constituted (following magnetic conductor and outside magnetic conductor are also together) by 8 trapezoidal blocks [11], between each block, all be added with insulant [2], the bore of last magnetic conductor [5] is promptly gone up magnetic conductor (following magnetic conductor also together) [5] inside (center of main coil [6]) and is probeed into certain depth less than the bore of main coil [6].Symbol F-F is section and direction.
Figure 46 is the F-F cross-sectional view of Figure 45.
Show among the figure that last magnetic conductor [5], the following magnetic conductor [8] be made up of the block [11] of 8 trapezium structures all probe into certain depth in main coil, and outside magnetic conductor [7] is in the outside of main coil [6].In last, the outside, down between magnetic conductor [5], [7], [8] and between they and main coil [6] and each bulk [11], be equipped with insulant [2].
The specific embodiment of the invention is as follows:
Embodiment 1:
A kind of pop can trade mark is 3004 Birmasil, and its chemical analysis is: 0.3%Si, and 0.7%Fe, 0.25%Cu, 1.2%Mn, 1.1%Mg, 0.25%Zn the rest is Al.Melting in the reflective resistance furnace of globar formula, its melt are 300kg, adopt composite electromagnetic inductor for electromagnetic casting of the present invention, implement as follows:
Main coil [6] is an annular, hypotenuse, its inclination alpha=30 °, top internal diameter Φ
On interior=190mm, bottom internal diameter Φ
Down interior=174mm, height h=35mm is that the copper plate of 3mm is made by thickness.
Magnetizer structure is an annular, its upper and lower and outside magnetic conductor, and each is formed by four blockss [11].Upper and lower magnetic conductor [5], [8], its parameter is: the internal diameter Φ of upper and lower magnetic conductor
In=166mm, external diameter Φ
Outward=366mm, height h
c=25mm is that 0.1mm silicon steel sheet level stacks and constitutes by thickness.The outside its external diameter of magnetic conductor [7] Φ
Outward=366mm, the top of internal diameter is Φ
On interior=198mm, its internal diameter bottom is Φ
Down interior=182mm is a 0.1mm silicon steel sheet vertical pile by thickness.
Between blocks [11], between blocks and main coil [6], adopt the polyimides varnished insulation, silicon steel sheet is by the glass wool cloth colligation, and scribbles lacquer type organic coating.
With main coil [6], last magnetic conductor [5], outside magnetic conductor [7], following magnetic conductor [8] by designing requirement of the present invention, is assemblied in the crystallizer periphery, uses epoxy resin plate washer [1] tightly then.
The electromagnetic casting process process is:
The first step is adjusted the level and the relative position of composite electromagnetic inductor, radome [3], cooling water chamber [9] and bed die;
Second step rose up into bed die in the composite electromagnetic inductor, made its top side location magnetic conductor intersection under inductor;
The 3rd step started power supply switches on to composite electromagnetic inductor, adjusts power, frequency and inductor current respectively to 10KW (common inductor then is 32KW), 2500HZ and 1500A (with common inductor 4800A then);
The 4th step, pour into a mould 3004 aluminium alloy liquid in bed die, when the half column of suspension height that forms reaches 35mm, adjust cooling water inflow to 3m
3/ h, and start the throwing system;
The 5th step, adjust teeming speed, initial teeming speed is 3cm/min, after 50 seconds, cooling water is sprayed onto ingot casting, in 20 seconds teeming speed is adjusted to 12cm/min, and keeps constant;
In the 6th step, strict control poring rate is complementary itself and teeming speed and keeps the liquid level constant altitude at h=35mm;
The 7th step after ingot casting length reaches 3 meters, stopped cast, treat that ingot casting solidifies fully after, powered-down system and shutting down takes out ingot casting, and is stand-by.
The 8th step, the quality examination of ingot casting.Through check: surface smoothness
8(do not adopt present technique, promptly common continuous casting then is
4), tensile strength sigma
b=240Mpa (common continuous casting ingot σ
b=210Mpa), extend δ=18.2% (common continuous casting ingot δ=11.5%)
Embodiment 2:
No. 45 common structural carbon steels, its chemical analysis is 0.42～0.49%C, 0.18～0.37%Si, 0.50～0.80Mn ,≤0.25%Cr, 0.25%Ni ,≤0.40%S ,≤0.040P.Require to adopt the composite electromagnetic inductor for electromagnetic casting of the technology of the present invention, on the basis that does not change the original size dimension of main coil, implement electromagnetic continuous-casting, produce than original little ingot casting.
Original main coil [6] is rectangle, straight flange, is of a size of long * wide * high=1000 * 400 * 40 (mm of unit, down together), is made for the 5mm copper plate by thickness;
Adopt crystallizer to be of a size of 400 * 180 * 350, thickness is δ
1=20mm material is a red copper, and the joint-cutting number is 50, crystallizer inwall maximum magnetic induction 30mT.
Upper and lower, the outside magnetic conductor [5] that is adopted, [8], [7] are rectangular ring, constitute by 10 blockss, and inside casing is of a size of 1000 * 400, and housing is of a size of 2000 * 1000, last magnetic conductor thickness δ
On=200mm, following magnetic conductor thickness is δ
Down=110mm, outside magnetic conductor thickness is δ
m=100mm.
Magnetic conductor is 300mm to the degree of depth that probes into of length direction, and probeing into the degree of depth to Width is 110mm.
Upper and lower, outside magnetic conductor is to be the blocks that the silicon steel plate packing of 0.1mm becomes by thickness, use the glass wool cloth colligation, scribbles resin and fixes, employing polyimides varnished insulation between blocks or between blocks and inductor.
Controlled step to the electromagnetic continuous-casting technical process of 45 steel is as follows:
The first step is changed crystallizer.Little crystallizer with 400 * 180 * 350 is changed 1000 * 400 * 350 big crystallizer, and adjusts cooling, lubricated and vibroseis.
Second step, the electromagnetic casting composite electromagnetic induction system that also adjusts is installed, upper and lower magnetic conductor and crystallizer outer wall are joined and fix;
In the 3rd step, the startup power supply system is adjusted to 2500A and 1000HZ with inductor current and frequency;
The 4th step, with the molten steel (1620 ℃) that melted in pans water crystallizer, to specified altitude (apart from cold crucible end face 50mm place), starting throwing system, the adjustment cooling water inflow is to 10m
3/ h;
The 5th step, open lubricated and vibrational system, casting machine when two cold-zone water are sprayed onto ingot casting, is adjusted to 1.0m/min with casting speed with the initial velocity dummy ingot of 0.2m/min gradually;
The 6th step, control cast, the normal operation of lubricated and vibrational system finishes to casting process, and powered-down is shut down, and takes out ingot casting.
The 7th step, the quality inspection of ingot casting (numeral in bracket is the numeral of not using the technology of the present invention and indicates with " former " word).
Result: casting billet surface fineness
5(former
3Below) tensile strength sigma
b=850Mpa (former 750Mpa), yield strength σ
s=550Mpa, (former 500Mpa) extends δ=19% (former 16%), impact toughness a
k=65m/cm
2(former 5.8m/cm
2).
Claims (10)
1, composite electromagnetic inductor for electromagnetic casting is to be made of electromagnetic inductor and the compound institute of permeability magnetic material, and it comprises main coil [6], cooling water chamber [9], radome [3], it is characterized in that, it also comprises:
A) be provided with the last magnetic conductor of manufacturing with the akin high permeability material of main coil [6] electromagnetic inductor shape [5], following magnetic conductor [8], outside magnetic conductor [7] or whole magnetic conductor [12] in top, bottom and the outside portion of main coil [6],
B) between last magnetic conductor [5] and main coil [6] and outside magnetic conductor [7], between following magnetic conductor [8] and main coil [6] and the outside magnetic conductor [7], between outside magnetic conductor [7] and the main coil [6], be added with the insulant [2] that insulating material constitutes.
2, composite electromagnetic inductor for electromagnetic casting according to claim 1 is characterized in that; Last magnetic conductor [5], following magnetic conductor [8], outside magnetic conductor [7], whole magnetic conductor [12] can be made of a plurality of blockss [11], and be added with insulant [2] between each blocks [11].
3, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: go up magnetic conductor [5], following magnetic conductor [8], outside magnetic conductor [7], whole magnetic conductor [12], be designed to annular solid, square body, cuboid or shaped body.
4, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: the medial surface and the angle β between horizontal plane that go up magnetic conductor [5] are 90 °～30 ° angles.
5, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: go up magnetic conductor [5], the relative distance d of the medial surface of following magnetic conductor [8] and main coil [6] its horizontal direction of medial surface is-50mm≤d≤2000mm.
6, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: the thickness δ of insulant [2] is 0≤δ≤50mm.
7, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: go up magnetic conductor [5], magnetic conductor [8], outside magnetic conductor [7] are separately and main coil [6] electromagnetic inductor is used down or be used with main coil [6] electromagnetic inductor behind various combination.
8, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: described high permeability material is the permeability magnetic material of magnetic permeability greater than permeability of vacuum.
9, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that: main coil [6] electromagnetic inductor is to be manufactured greater than the material of steel by conductance.
10, composite electromagnetic inductor for electromagnetic casting according to claim 1 and 2 is characterized in that, insulant [2] is greater than 10 by insulation resistance
4The insulating material of Ω constitutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97112897 CN1092466C (en) | 1997-08-10 | 1997-08-10 | Composite electromagnetic inductor for electromagnetic casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97112897 CN1092466C (en) | 1997-08-10 | 1997-08-10 | Composite electromagnetic inductor for electromagnetic casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1208317A CN1208317A (en) | 1999-02-17 |
| CN1092466C true CN1092466C (en) | 2002-10-09 |
Family
ID=5172548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97112897 Expired - Fee Related CN1092466C (en) | 1997-08-10 | 1997-08-10 | Composite electromagnetic inductor for electromagnetic casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1092466C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069175B (en) * | 2011-01-24 | 2013-01-02 | 哈尔滨工业大学 | Plug-in cylindrical traveling wave magnetic field sensor for casting |
| ES2704883T3 (en) * | 2011-03-14 | 2019-03-20 | Consarc Corp | Cool electric induction crucible with open bottom for use in electromagnetic casting of ingots and method for casting in the crucible |
| CN102179490A (en) * | 2011-04-15 | 2011-09-14 | 中天合金技术有限公司 | Oxygen-free copper strip horizontal electromagnetic casting device |
| CN102198505B (en) * | 2011-05-13 | 2012-10-10 | 浙江大学 | Machining device for iron steel alloy materials |
| CN103582196B (en) * | 2012-07-26 | 2015-06-17 | 宝山钢铁股份有限公司 | Method and device for intelligently controlling magnetic field intensifier in induction heating process |
| CN114252504A (en) * | 2021-12-20 | 2022-03-29 | 马鞍山钢铁股份有限公司 | Online rapid detection method and detection device for corner cracks of continuous casting slab |
-
1997
- 1997-08-10 CN CN 97112897 patent/CN1092466C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1208317A (en) | 1999-02-17 |
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