CN115533058A - Combined type side spiral electromagnetic stirring device - Google Patents
Combined type side spiral electromagnetic stirring device Download PDFInfo
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- CN115533058A CN115533058A CN202211301578.1A CN202211301578A CN115533058A CN 115533058 A CN115533058 A CN 115533058A CN 202211301578 A CN202211301578 A CN 202211301578A CN 115533058 A CN115533058 A CN 115533058A
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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Abstract
The invention relates to a combined type side spiral electromagnetic stirring device, which comprises a magnetic yoke group, a magnetic yoke fixing sleeve, a rotating magnetic field coil and a traveling wave magnetic field coil, wherein the magnetic yoke group is arranged on the magnetic yoke fixing sleeve; when the alternating current applied by the traveling wave magnetic field coil is positive, the alternating current is switched in the positive direction, and when the alternating current applied by the traveling wave magnetic field coil is negative, the alternating current is switched in the reverse direction, so that the magnetic pole directions alternately point to the two ends of the casting blank; the rotating magnetic field coil generates rotating electromagnetic force moving along the circumferential direction of the casting blank and forms a rotating magnetic field; the traveling wave magnetic field coil generates traveling wave electromagnetic force which is transmitted along the radial centripetal part of the casting blank and has axial component force, the formed traveling wave magnetic field enables the rotating magnetic field to incline along the axial direction of the casting blank, and the finally formed coupling magnetic field has a side spiral stirring effect which inclines to the cross section of the casting blank, so that the phenomenon of negative segregation caused by overlarge stirring strength in the casting process of the large-specification casting blank is effectively improved.
Description
Technical Field
The invention relates to the technical field of electromagnetic metallurgy casting, in particular to a combined type side spiral electromagnetic stirring device.
Background
The quality control is the primary requirement in the metal casting process, and the quality of a casting blank has a close relation with the flowing of molten steel and the heat and mass transfer behaviors in the solidification process. The electromagnetic field has incomparable advantages with other physical fields, and has the most remarkable characteristic of transferring heat energy and kinetic energy without directly contacting molten steel and no pollution. Therefore, electromagnetic stirring is an effective means for controlling the flow of molten steel to improve the quality of a cast slab, and the technology can promote the mixing of molten steel before solidification, homogenize the components and temperature of an unsolidified area, improve the cleanliness of the molten steel, enlarge an equiaxed crystal area, improve the quality problems of loose segregation and the like, and is widely applied to the continuous casting, semi-solid casting and directional solidification processes in recent years.
The rotary electromagnetic stirring has very critical effect on refining structure crystal grains and homogenizing circumferential temperature distribution of the casting blank, but axial stirring is insufficient, the effective action range is small, and in addition, negative segregation phenomenon can occur on the edge of the casting blank when the stirring intensity is too large. The traveling wave electromagnetic stirring can control and adjust the axial movement of the molten steel in the casting blank, promote the axial convection of the molten steel, enlarge the axial stirring range, but has insufficient influence on the radial direction of the casting blank. With the increasing demand of modern metallurgy on large-size and high-quality alloy steel products, the quality demand cannot be met due to the limitations of stirring strength and stirring range of the rotary stirring or traveling wave stirring of a single magnetic field; therefore, a spiral electromagnetic stirring mode formed by superposing two magnetic fields is provided, and the spiral electromagnetic stirring integrates the action characteristics of rotary electromagnetic stirring and traveling wave electromagnetic stirring, so that molten steel can do spiral motion, the heat exchange and solute exchange in the radial direction and the axial direction are enhanced, the temperature gradient of the center and the solidification front edge of the molten steel is reduced, and the phenomena of center segregation, looseness and the like are relieved.
At present, the modes for realizing the helical electromagnetic stirring include three modes of internal and external superposition of a rotating magnetic field and a travelling wave magnetic field, up and down arrangement of the rotating magnetic field and circumferential arrangement of the travelling wave magnetic field, such as the Chinese utility model patent with the publication numbers of CN201476606U ("crucible helical magnetic field electromagnetic stirrer"), CN87204232U ("helical magnetic field electromagnetic stirrer"), and the technical schemes recorded in the Chinese patent applications with the publication numbers of CN87104014A ("continuous cast steel electromagnetic stirring device"), CN86104510A ("combined multifunctional liquid metal electromagnetic stirrer"). Further, there is a method of changing the shape of the yoke so that the end faces of the yoke are placed obliquely and the end faces of the yoke are arranged up and down with respect to the back of the yoke, such as the method described in chinese patent application publication nos. CN102825245a ("helical electromagnetic stirrer"), CN102825242A ("vacuum suction casting apparatus and method for high activity, high purity and high melting point alloy"), CN108515153A ("composite magnetic field helical electromagnetic stirrer"), and CN107116191a ("composite helical electromagnetic stirrer"). Although the technical scheme can realize the spiral stirring of the molten steel, the combined structure and the magnetic yokes in various shapes increase the equipment cost and improve the operation difficulty, and magnetic fields generated by the combination of various windings interfere with each other to influence the actual effect of the electromagnetic stirring. In addition, the stirring mode of the spiral magnetic field only considers the radial and axial stirring of the casting blank, the action range of the stirrer is expanded to a certain extent, but the disturbance to the core of the casting blank is not actually promoted, and the molten steel at the core is not sufficiently supplied, so that a series of quality problems such as segregation, looseness, even shrinkage and the like easily occur to the core of the casting blank, and the method is particularly serious in the casting process of large-size casting blanks. At present, the solution of adjusting the current parameter of the electromagnetic stirrer to enhance the stirring intensity and range is usually adopted, but the negative segregation degree is increased along with the increase of the stirring intensity, which is not beneficial to generating effective spiral stirring.
Disclosure of Invention
The invention provides a composite side spiral electromagnetic stirring device, which is a simple and efficient spiral electromagnetic stirring device, and adopts a special exciting current applying mode, and the electromagnetic force synthesized by coupling a rotating magnetic field and a traveling wave magnetic field generates side spiral stirring with an included angle of-90 degrees with the horizontal plane of a casting blank, so that the stirring effect of the core part of the casting blank can be enhanced, molten steel can move in a side spiral track, and the phenomenon of negative segregation caused by overlarge stirring intensity in the casting process of large-size casting blanks is effectively improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combined type side spiral electromagnetic stirring device comprises a magnetic yoke group, a magnetic yoke fixing sleeve, a rotating magnetic field coil and a traveling wave magnetic field coil; the magnetic yoke fixing sleeve is of a sleeve-shaped structure and is sleeved on the periphery of the casting blank; the magnetic yoke group is uniformly arranged on the inner side of the magnetic yoke fixing sleeve along the circumferential direction; the rotating magnetic field coils are wound on the corresponding magnetic yokes in the magnetic yoke group in a centralized winding mode, and alternating currents with the same magnitude and opposite directions are conducted on the adjacent rotating magnetic field coils, so that the magnetic pole directions of the rotating magnetic fields point to the radial direction of the casting blank; the traveling wave magnetic field coils and the magnetic yoke fixing sleeve are coaxially arranged on the inner side of the rotating magnetic field coil; when the alternating current applied by the traveling wave magnetic field coil is positive, the alternating current is switched in the positive direction, and when the alternating current applied by the traveling wave magnetic field coil is negative, the alternating current is switched in the reverse direction, so that the magnetic pole directions alternately point to the two ends of the casting blank; the rotating magnetic field coil generates rotating electromagnetic force moving along the circumferential direction of the casting blank and forms a rotating magnetic field; the traveling wave magnetic field coil generates traveling wave electromagnetic force which is transmitted along the radial centripetal part of the casting blank and has axial component force, the formed traveling wave magnetic field enables the rotating magnetic field to incline along the axial direction of the casting blank, and the finally formed coupling magnetic field has a side spiral stirring effect which is inclined to the cross section of the casting blank.
The magnetic yoke fixing sleeve is of a sleeve-shaped structure with a circular cross section, and the casting blank is a cylindrical casting blank.
The cross section of the magnetic yoke in the magnetic yoke group is rectangular, and the magnetic yoke group consists of 4 or 6 magnetic yokes.
A plurality of gaps for fixing the traveling wave magnetic field coil are axially arranged on the inner side of the magnetic yoke along the magnetic yoke fixing sleeve; the number of the travelling wave magnetic field coils is 2, 4 or 6.
The included angle between the electromagnetic force of the coupling magnetic field and the cross section of the casting blank is-90 degrees.
And the rotating magnetic field coil and the traveling wave magnetic field coil are both powered by a three-phase alternating power supply.
The phase angle difference of the current introduced into the windings of the adjacent rotating magnetic field coils and the adjacent travelling wave magnetic field coils is 120 degrees, the current frequency is 1-10 Hz, and the current intensity is 0-1000A.
The current intensity of the traveling wave magnetic field is 1/2-2/3 of the current intensity of the rotating magnetic field.
Compared with the prior art, the invention has the beneficial effects that:
1) By adopting a special exciting current applying mode, the electromagnetic force synthesized after the mutual coupling of the rotating magnetic field and the traveling wave magnetic field generates side spiral stirring with an included angle of-90 degrees with the horizontal plane of the casting blank, the stirring effect of the core part of the casting blank can be enhanced, the molten steel can move in a side spiral track, and the phenomenon of negative segregation caused by overlarge stirring intensity in the casting process of large-size casting blanks is effectively improved;
2) The structure of the combined type side spiral electromagnetic stirring device is similar to that of a traditional internal and external superposed type spiral electromagnetic stirrer, the structure is simple, the realization is easy, the cost is saved, and the two types of magnetic fields have no directional magnetic field conflict when being excited simultaneously, so that the magnetic field loss rate is low;
3) The strength of the rotating force and the traveling wave force can be adjusted in a targeted manner by changing the number of the coils, so that side spiral stirring effects with different angles and strengths are generated, and the controllability of the magnetic field is stronger;
4) Compared with the existing electromagnetic stirring device, the special side spiral stirring mode is adopted, the problems of insufficient stirring of the core part of the large-size casting blank and negative segregation at the edge are solved, the device is more suitable for the production process of the large-size casting blank, and the device has obvious improvement effect on the defects of segregation, looseness and the like of the core part of the casting blank.
Drawings
Fig. 1 is a schematic perspective view of the composite side-spiral electromagnetic stirring apparatus of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a middle sectional view of the composite side-spiral electromagnetic stirring apparatus of the present invention.
Fig. 4a is a schematic diagram of a conventional excitation current application manner of a traveling wave magnetic field.
Fig. 4b is a schematic diagram of the excitation current application mode of the travelling wave magnetic field according to the present invention.
Fig. 5a is a schematic diagram of the electromagnetic force distribution of the rotating magnetic field in the cross section of the casting blank according to the invention.
FIG. 5b is the electromagnetic force distribution of the travelling wave magnetic field in the cross section of the casting blank according to the present invention.
Fig. 5c is a schematic diagram of the electromagnetic force distribution of the coupling magnetic field in the cross section of the casting blank according to the invention.
FIG. 6a is a schematic view of the magnetic pole change of the traveling wave magnetic field in the longitudinal section of the casting blank.
FIG. 6b is a schematic diagram of the magnetic pole change of the traveling wave magnetic field in the longitudinal section of the casting blank according to the invention.
FIG. 7 is a schematic diagram of the electromagnetic force distribution of the coupling magnetic field in the longitudinal section of the casting blank according to the present invention.
FIG. 8 is a three-dimensional flow chart of the inside of a cast slab under the effect of the coupling magnetic field according to the present invention.
In the figure: 1. casting blank 2, magnetic yoke fixing sleeve 3, magnetic yoke group 4, rotating magnetic field coil 5 and traveling wave magnetic field coil
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1 and 2, the combined type side helical electromagnetic stirring device of the present invention includes a magnetic yoke assembly 3, a magnetic yoke fixing sleeve 2, a rotating magnetic field coil 4 and a traveling magnetic field coil 5; the magnetic yoke fixing sleeve 2 is of a sleeve-shaped structure and is sleeved on the periphery of the casting blank 1; the magnetic yoke group 3 is uniformly arranged on the inner side of the magnetic yoke fixing sleeve 2 along the circumferential direction; the rotating magnetic field coils 4 are wound on corresponding magnetic yokes in the magnetic yoke group 3 in a centralized winding mode, alternating currents with the same magnitude and opposite directions are conducted on the adjacent rotating magnetic field coils 4, and the magnetic pole directions of the rotating magnetic fields are enabled to point to the radial direction of the casting blank 1; the traveling wave magnetic field coils 5 and the magnetic yoke fixing sleeve 2 are coaxially arranged on the inner side of the rotating magnetic field coil 4; when the alternating current applied by the traveling wave magnetic field coil 5 is positive, the alternating current is switched in the positive direction, and when the alternating current applied by the traveling wave magnetic field coil 5 is negative, the alternating current is switched in the reverse direction, so that the magnetic pole directions alternately point to the two ends of the casting blank 1; the rotating magnetic field coil 4 generates rotating electromagnetic force moving along the circumferential direction of the casting blank 1 and forms a rotating magnetic field; the traveling wave magnetic field coil 5 generates traveling wave electromagnetic force which is transmitted to the centripetal part along the radial direction of the casting blank 1 and has axial component force, the formed traveling wave magnetic field enables the rotating magnetic field to incline along the axial direction of the casting blank 1, and the finally formed coupling magnetic field has a side spiral stirring effect which is inclined to the cross section of the casting blank 1.
The magnetic yoke fixing sleeve 2 is of a sleeve-shaped structure with a circular cross section, and the casting blank 1 is a cylindrical casting blank.
The cross section of the magnetic yoke in the magnetic yoke group 3 is rectangular, and the magnetic yoke group 3 consists of 4 or 6 magnetic yokes.
As shown in fig. 3, a plurality of slits are axially arranged on the inner side of the magnetic yoke along the magnetic yoke fixing sleeve 2 for fixing the traveling wave magnetic field coil 5; the number of travelling wave magnetic field coils 5 is 2, 4 or 6.
The included angle between the electromagnetic force of the coupling magnetic field and the cross section of the casting blank 1 is-90 degrees.
The rotating magnetic field coil 4 and the traveling wave magnetic field coil 5 are both powered by a three-phase alternating power supply.
The phase angle difference of the current introduced into the windings of the adjacent rotating magnetic field coil 4 and the adjacent traveling wave magnetic field coil 5 is 120 degrees, the current frequency is 1-10 Hz, and the current intensity is 0-1000A.
The current intensity of the traveling wave magnetic field is 1/2-2/3 of the current intensity of the rotating magnetic field.
The composite side spiral electromagnetic stirring device is used for electromagnetically stirring a casting blank and is arranged on the periphery of the casting blank 1 when in use, as shown in fig. 1 and 2, the composite side spiral electromagnetic stirring device comprises a magnetic yoke group 3, a magnetic yoke fixing sleeve 2, a rotating magnetic field coil 4 and a traveling wave magnetic field coil 5, the magnetic yoke group is composed of a plurality of magnetic yokes, the cross section of each magnetic yoke is rectangular, the number of the magnetic yokes is even, preferably 4 or 6, and each magnetic yoke is uniformly arranged on the inner side of the magnetic yoke fixing sleeve 3 along the circumferential direction of the magnetic yoke fixing sleeve. A plurality of slits (as shown in fig. 3) are formed inside each magnetic yoke for fixing the traveling wave magnetic field coils 5, the number of the traveling wave magnetic field coils 5 is even, preferably 2, 4 or 6, and the traveling wave magnetic field coils 5 are arranged along the longitudinal direction of the casting blank 1. The rotating magnetic field coil 4 and the traveling wave magnetic field coil 5 can be made of copper wires or hollow copper tubes.
The structure of the combined type side spiral electromagnetic stirring device is similar to that of a traditional internal and external superimposed type spiral electromagnetic stirrer, the rotating magnetic field coils 4 are wound on the magnetic yoke in a centralized winding mode, alternating currents with the same magnitude and opposite directions are conducted on the adjacent rotating magnetic field coils 4, the magnetic pole directions of the rotating magnetic field coils 4 are enabled to point to the radial direction of the casting blank 1, and electromagnetic force is controlled to rotate along the circumferential direction of the casting blank 1 (as shown in fig. 5 a). The traveling wave magnetic field coil 5 is fixed inside the magnetic yoke group 3 in a linear manner along the axial direction of the magnetic yoke fixing sleeve 2, however, the application manner of the excitation current in the traveling wave magnetic field coil in the invention is different from the traditional traveling wave magnetic field (the application manner of the excitation current is as shown in fig. 4a, namely, alternating currents with equal magnitude and same direction are introduced). As shown in fig. 4b, in the present invention, when the alternating current applied to the traveling wave magnetic field coil 5 is positive, the alternating current is switched in the positive direction, and when the alternating current applied to the traveling wave magnetic field coil 5 is negative, the alternating current is switched in the reverse direction, so that the magnetic pole directions are alternately directed to the two ends of the casting blank 1, and the electromagnetic force is controlled to be transmitted to the core portion along the radial direction of the casting blank 1 (as shown in fig. 5 b). Due to the action characteristic of alternating current, the magnetic pole direction of the traveling wave magnetic field is reversed along the axial direction of the casting blank 1 in a unit period, in the process, the included angle between the magnetic pole direction of the traveling wave magnetic field and the magnetic pole direction of the rotating magnetic field is-90 degrees, and under the mutual coupling action of the traveling wave magnetic field and the rotating magnetic field, the coupling magnetic field finally generated by the synthetic electromagnetic force forms a side spiral stirring effect with the included angle of-90 degrees with the cross section of the casting blank 1.
The invention relates to a combined type side spiral electromagnetic stirring device which is characterized in that: a special traveling wave magnetic field exciting current access mode is adopted, so that the rotary electromagnetic force in the casting blank 1 is transmitted to the core part of the casting blank 1 along the inclined direction, the core part stirring effect of the casting blank 1 is enhanced, and the problem of negative segregation commonly existing when a traditional electromagnetic stirring device is adopted is solved.
In the invention, the power supply devices of the rotating magnetic field and the traveling wave magnetic field both adopt a three-phase alternating power supply, the phase angle difference of current introduced into the windings of the adjacent rotating magnetic field coil and the adjacent traveling wave magnetic field coil is 120 degrees, the current frequency is 1-10 Hz, and the current intensity is 0-1000A. Because the molten steel has certain gravity and viscosity, the stirring effect is optimal when the current intensity of the traveling wave magnetic field is 1/2-2/3 of that of the rotating magnetic field. The rotating magnetic field coil 4 and the traveling wave magnetic field coil 5 can be respectively powered by two sets of power supply equipment, and can be suitable for casting high-alloy steel with various section sizes by adjusting the strength of the rotating force and the centripetal force in the coupling magnetic field according to the actual requirements of a production field.
The large-section casting blank is easy to have the problems of center segregation, looseness, even shrinkage cavity and the like due to slow solidification process and insufficient core molten steel feeding, and at the moment, stronger core stirring is needed to improve the quality of the casting blank. When the traditional electromagnetic stirring device is adopted, the stirring intensity can only be improved in order to improve the stirring intensity of the core part of the casting blank, but the negative segregation problem can be caused. The combined type side spiral electromagnetic stirring device adopts a unique inclined centripetal stirring mode, the stirring effect of the center of a casting blank is enhanced, meanwhile, the longitudinal components and the temperature of the casting blank can be uniform through inclined stirring, the circulating area of molten steel is enlarged, the problem of negative segregation can be effectively improved, and a technical support is provided for the production of a casting blank with a larger section.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ examples ] A method for producing a compound
As shown in fig. 1, in the present embodiment, a round billet having a cross-sectional size of 800mm is used as a cast billet 1, and the combined type side helical electromagnetic stirring apparatus has a structure in which 6 yokes, 6 rotating magnetic field coils, and 6 traveling wave magnetic field coils are combined. The magnetic yoke fixing sleeve 2 is of a thin-wall cylindrical structure, the inner diameter is 1650mm, the outer diameter is 1800mm, and the height is 440mm. The magnetic yoke group is made of oriented silicon steel with high magnetic permeability, the magnetic yoke is of a cubic structure with the size of 350mm multiplied by 220mm multiplied by 440mm, and 5 grooves with the width of 40mm are formed in the inner side of the magnetic yoke group and used for fixing the traveling wave magnetic field coil 5.
The rotating magnetic field coil 4 and the traveling wave magnetic field coil 5 are both made of hollow copper pipes, and cooling water can be introduced into the hollow copper pipes for cooling. Two sets of power supply devices are adopted to supply power respectively, the current frequency is 3Hz, the exciting currents of the rotating magnetic field coil 4 and the traveling wave magnetic field coil 5 are 400A and 250A respectively, the number of turns of the coils is 30, and the rotating magnetic field coil 4 and the traveling wave magnetic field coil 5 jointly act to form a side spiral magnetic field.
In this embodiment, the excitation current of the traveling wave magnetic field is applied in a manner as shown in fig. 4b, and the alternating electromagnetic force is transmitted to the core portion perpendicular to the surface of the casting blank 1 (as shown in fig. 5 b), and forms a centripetal stirring force as shown in fig. 5c under the combined action of the alternating electromagnetic force and the rotating magnetic field shown in fig. 5a, thereby enhancing the core portion stirring effect of the casting blank 1.
When the traveling wave magnetic field works alone, the change rule of the magnetic induction lines in a unit period is as shown in fig. 6a and 6b, the magnetic pole directions alternately point to the two ends of the casting blank and interact with the rotating magnetic field rotating in the circumferential direction in the casting blank 1 to synthesize a coupling magnetic field for obliquely stirring molten steel, as shown in fig. 7.
Under the action of the combined type side spiral electromagnetic stirring device, the three-dimensional streamline of the molten steel in the casting blank is shown in figure 8: the molten steel is stirred in an inclined mode under the action of the coupling magnetic field, and in the embodiment, the inclined angle of inclined stirring is 33.7 degrees.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. A combined type side spiral electromagnetic stirring device is characterized by comprising a magnetic yoke group, a magnetic yoke fixing sleeve, a rotating magnetic field coil and a traveling wave magnetic field coil; the magnetic yoke fixing sleeve is of a sleeve-shaped structure and is sleeved on the periphery of the casting blank; the magnetic yoke group is uniformly arranged on the inner side of the magnetic yoke fixing sleeve along the circumferential direction; the rotating magnetic field coils are wound on the corresponding magnetic yokes in the magnetic yoke group in a centralized winding mode, and alternating currents with the same magnitude and opposite directions are conducted on the adjacent rotating magnetic field coils, so that the magnetic pole directions of the rotating magnetic fields point to the radial direction of the casting blank; the traveling wave magnetic field coils and the magnetic yoke fixing sleeve are coaxially arranged on the inner side of the rotating magnetic field coil; when the alternating current applied by the traveling wave magnetic field coil is positive, the alternating current is switched in the positive direction, and when the alternating current applied by the traveling wave magnetic field coil is negative, the alternating current is switched in the reverse direction, so that the magnetic pole directions alternately point to the two ends of the casting blank; the rotating magnetic field coil generates rotating electromagnetic force moving along the circumferential direction of the casting blank and forms a rotating magnetic field; the traveling wave magnetic field coil generates traveling wave electromagnetic force which is transmitted along the radial centripetal part of the casting blank and has axial component force, the formed traveling wave magnetic field enables the rotating magnetic field to incline along the axial direction of the casting blank, and the finally formed coupling magnetic field has a side spiral stirring effect which is inclined to the cross section of the casting blank.
2. The apparatus of claim 1, wherein the yoke retainer sleeve is a sleeve-like structure having a circular cross-section, and the billet is a cylindrical billet.
3. The compound side-helical electromagnetic stirring apparatus of claim 1, wherein the cross section of the magnetic yoke in the magnetic yoke assembly is rectangular, and the magnetic yoke assembly is composed of 4 or 6 magnetic yokes.
4. A combined side-helical electromagnetic stirring apparatus as set forth in claim 1 or 3, wherein the inside of said yoke is provided with a plurality of slits along the axial direction of the yoke fixing sleeve for fixing the traveling-wave magnetic field coil; the number of travelling wave magnetic field coils is 2, 4 or 6.
5. The combined type side-spiral electromagnetic stirring device of claim 1, wherein an included angle between the electromagnetic force of the coupling magnetic field and the cross section of the casting blank is-90 ° to 90 °.
6. The assembly of claim 1, wherein the rotating magnetic field coil and the traveling magnetic field coil are powered by a three-phase alternating current power source.
7. The compound side-helical electromagnetic stirring device as claimed in claim 1, wherein the phase angle difference of the current passing through the windings of the adjacent rotating magnetic field coils and the adjacent travelling wave magnetic field coils is 120 °, the current frequency is 1-10 Hz, and the current intensity is 0-1000A.
8. The compound side-helical electromagnetic stirring apparatus of claim 1, wherein the current intensity of the traveling-wave magnetic field is 1/2-2/3 of the current intensity of the rotating magnetic field.
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| CN202211301578.1A CN115533058A (en) | 2022-10-24 | 2022-10-24 | Combined type side spiral electromagnetic stirring device |
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| CN202211301578.1A CN115533058A (en) | 2022-10-24 | 2022-10-24 | Combined type side spiral electromagnetic stirring device |
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