CN104028717A - Electromagnetic swirling continuous casting method - Google Patents
Electromagnetic swirling continuous casting method Download PDFInfo
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- CN104028717A CN104028717A CN201410254236.8A CN201410254236A CN104028717A CN 104028717 A CN104028717 A CN 104028717A CN 201410254236 A CN201410254236 A CN 201410254236A CN 104028717 A CN104028717 A CN 104028717A
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- eddy flow
- electromagnetic eddy
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- river
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Abstract
The invention discloses an electromagnetic swirling continuous casting method, and belongs to the technical field of smelting continuous casting. The electromagnetic swirling continuous casting method comprises the following steps: (1) a used electromagnetic swirling device is 180-degree semicircular ring-shaped, split 360-degree ring-shaped, horseshoe-shaped or improved horseshoe-shaped; (2) the electromagnetic swirling device is fixed onto a moving device; a nozzle is an immersive nozzle between a tundish and a crystallizer, or a long nozzle between a steel ladle and the tundish; (3) during continuous casting, the electromagnetic swirling device is moved close to the nozzle by the moving device so as to exert a swirling electrical field to molten steel. The electromagnetic swirling continuous casting method is universally applicable to various technical conditions such as a circular blank, a square blank and a slab blank, can be accurately and optimally designed, and is simple and easy to operate; original continuous casting equipment is not required to be restructured.
Description
Technical field
The invention belongs to and smelt continuous casting technology field, particularly a kind of electromagnetic eddy flow continuous cast method.
Background technology
In casting process, submersed nozzle goes out to flow the main flow phenomenon that conventionally can swing, occur that crystallizer inner nozzle goes out the uneven bias current in stream size left and right, result can cause flowing in crystallizer even with temperature distributing disproportionation, thereby cause liquid level Local cooling, bleed-out, the series of problems such as slab surface crack; Bias current also can cause liquid fluctuating, and particularly along with continuous casting casting speed improves, the mouth of a river goes out to flow inhomogeneities aggravation, liquid fluctuating aggravation, thereby the raising of restriction pulling rate; Bias current also can cause occurring near eddy current slag and near the shearing slag of the minor face mouth of a river, produces serious slab quality defect: as subcutaneous pin hole, and subcutaneous slag inclusion, the increase of the line defect of coiled sheet etc.; But because following reason etc., the generation of this bias current is difficult to avoid:
(1) inertia in molten steel horizontal direction: molten steel has in the horizontal direction certain speed when entering submersed nozzle, makes molten steel skewness on cross section, the mouth of a river, thereby the molten steel that makes the mouth of a river go out stream produces bias current.
(2) slide gate nozzle is controlled: in continuous casting, controlling the slide gate nozzle of molten steel flow conventionally all in half-open state, is not vertical so cause the molten steel flow direction of downward injection submersed nozzle, but under oblique.Because this reason, while molten steel can swing to flow downward as crawl and enters crystallizer in submersed nozzle.And this flows is not Steady Flow, and molten steel is injected in crystallizer by time-dependent stream.
(3) field trash dross: the field trash existing in molten steel can be adsorbed on mouth of a river inner surface when by submersed nozzle, growing up and dross in part, makes molten steel skewness on cross section, the mouth of a river, forms bias current.
(4) reason of operation: the center of submersed nozzle center and ladle upper nozzle there will be out-of-alignment situation, also can cause bias current.
SUMITOMO CHEMICAL metal company etc. has been developed mechanical type eddy flow downspout in recent years; In the inside of submersed nozzle, place refractory material rotating vane processed, the potential energy that utilizes molten steel to flow into from top, the mouth of a river forms rotational flow when by blade; Evidence, it is even, stable that the molten steel mouth of a river of eddy flow state goes out stream, improved in crystallizer and flowed and Temperature Distribution, and obviously reduced liquid fluctuating; Sumitomo Metal Industries have carried out commodity production at present, have improved pulling rate, significantly improve casting billet surface and internal soundness.But this method has major defect: the one, refractory material helical blade due to molten steel to wash away the life-span low, thereby molten steel field trash easily adsorbs and stops up on helical blade, often change the mouth of a river not only cost improve, more have a strong impact on production; The 2nd, under this method, convolution speed and the decrease speed of molten steel are directly proportional, while flowing (as low speed casting) at low speed, can not obtain effectively convolution flows, opening the stage of watering, changing the ladle stage and cast latter stage, molten steel can not obtain necessary convolution and flow, its homogeneous temperature field, the functions such as removal of inclusions can sharply worsen; Also have, this cyclone mode is unadjustable, is difficult to adapt to different process requirement, and therefore application is restricted.
For above-mentioned mechanical eddy flow downspout, application number is that 200510047290.6 Chinese patent discloses a kind of electromagnetic eddy flow downspout, at submersed nozzle, rotary electromagnetic field is installed around and is produced eddy flow with molten steel in the mouth of a river, can reach the same effect of mechanical eddy flow downspout, not stop up again and life problems; Swirl strength is adapted to the requirement of different steel grades and continuous casting billet shape more flexibly simultaneously; Basic research shows, electromagnetic eddy flow downspout can produce the equal swirl strength of mechanical eddy flow downspout in the mouth of a river, is expected to obtain equal metallurgical effect; But different from mechanical eddy flow downspout, electromagnetic eddy flow downspout need to be arranged at the mouth of a river electromagnetic eddy flow device around; And limited by continuous casting process, the surrounding space of crystallizer is narrow and small, and between tundish and crystallizer, space is also limited; The position that electromagnetic eddy flow device is around placed at the mouth of a river, the on-the-spot move mode of electromagnetic eddy flow device, can appropriate electromagnetic eddy flow apparatus structure also effectively generate an electromagnetic field decision electromagnetic eddy flow downspout and act on molten steel in the mouth of a river, can carry out smoothly continuous casting production, also there is no relevant research report at present.
Summary of the invention
The problem existing in practical technique for existing electromagnetic eddy flow downspout, the invention provides a kind of electromagnetic eddy flow continuous cast method, do not changing under the condition of casting apparatus, independently travel mechanism and electromagnetic eddy flow device are installed near crystallizer, make electromagnetic eddy flow device fast moving when needs are worked around the mouth of a river, implement electromagnetic eddy flow continuous casting.
Electromagnetic eddy flow continuous cast method of the present invention comprises the following steps:
1, the electromagnetic eddy flow device adopting is that 180o semicircle is ring-like, split 360o is ring-like, horseshoe type or improve horseshoe type; When electromagnetic eddy flow device is split 360o when ring-like, electromagnetic eddy flow device be divided into first and second portion, the one end between two parts is hinged, the other end is respectively equipped with supporting locking device; When electromagnetic eddy flow device is that while improving horseshoe type, two side front ends of electromagnetic eddy flow device are with elbow;
2, electromagnetic eddy flow device is fixed on mobile device; The described mouth of a river is the submersed nozzle between tundish and crystallizer, or is the long nozzle between ladle and tundish; Described mobile device is the movable pulley mechanism being fixed on tundish chassis, or is fixed on the movable pulley mechanism on mobile trolley used;
While 3, carrying out continuous casting, by mobile device, electromagnetic eddy flow device is moved to around the mouth of a river, to the energising of electromagnetic eddy flow device, make it produce rotary electromagnetic field, and then the molten steel in the mouth of a river is applied to rotary electromagnetic field, make the molten steel in the mouth of a river produce rotation, obtain the uniform mouth of a river and go out stream.
In said method, electromagnetic eddy flow device, according to the requirement of production process, carries out vertical and moves horizontally.
In said method, when electromagnetic eddy flow device is that 180o semicircle is ring-like, horseshoe type or while improving horseshoe type, electromagnetic eddy flow device directly moves to around the mouth of a river by mobile device, makes electromagnetic eddy flow device ring outside around the mouth of a river; When electromagnetic eddy flow device is split 360o when ring-like, first the locking device of electromagnetic eddy flow device is opened, move to the mouth of a river around after, locking device is closed and locked, make electromagnetic eddy flow device ring outside around the mouth of a river.
Above-mentioned electromagnetic eddy flow device is provided with water collar or air-cooled cover, and wherein water collar is outer water collar or interior water collar.
The magnetic induction intensity of the rotary electromagnetic field producing when above-mentioned electromagnetic eddy flow device is worked is 10
-4~ 1T, the frequency of rotary electromagnetic field is at 0.1 ~ 500Hz.
In said method, when mobile device is the movable pulley mechanism being fixed on tundish chassis cantilever, electromagnetic eddy flow device is positioned at the opposite of manual operation position, crystallizer place.
Movable pulley mechanism in said method comprises cantilever, pulley and support; Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley, and pulley and cantilever are slidably connected; Cantilever is fixed on tundish chassis or mobile trolley used crossbeam.
Above-mentioned electromagnetic eddy flow device adopts that split 360o is ring-like, horseshoe type or improve horseshoe type structure so that make electromagnetic eddy flow device ring around magnetic field, inner space more even, magnetic induction intensity is larger.
Method of the present invention can move at least one electromagnetic eddy flow device submersed nozzle or long nozzle correct position around fast, carries out electromagnetic eddy flow continuous casting, in continuous casting fault, when need to carry out outlet replacing or stopping continuous casting, electromagnetic eddy flow device is moved apart rapidly to the mouth of a river; The method is not only applicable to the submersed nozzle between tundish and crystallizer, is also applicable to the long nozzle between ladle and tundish, thereby reaches clean molten steel, mentions molten steel recovery rate, saves the effect of refractory material.
The contour structures of the move mode of electromagnetic eddy flow device and electromagnetic eddy flow device is key content; The move mode of the travel mechanism of electromagnetic eddy flow device can be by the mode of manual, electronic or hydraulic pressure etc., thereby movable pulley mechanism is moved electromagnetic eddy flow device is moved quickly into forward to operating position around, the mouth of a river, also can electromagnetic eddy flow device be moved quickly into safe standby position backward by same mode, now can carry out common continuous casting; The chassis of mobile device itself can be also wheeled or rail mounted, with respect to operative employee, can left and right (when chassis is positioned at crystallizer side) or move forward and backward (when chassis is positioned at crystallizer rear or the place ahead), move mode when mobile device is positioned at crystallizer side is by the mode such as manual, the chassis that is positioned at crystallizer side to be moved left and right, by being fixed on swirl-flow devices on chassis, moving quickly into the mouth of a river around or withdraw, move mode can be also that cantilever on mobile trolley used or the movable pulley mechanism on cantilever are with mobile swirl-flow devices; When mobile device is positioned at crystallizer rear or the place ahead, can make mobile trolley used or cantilever or movable pulley mechanism move forward and backward.
The structure of the electromagnetic eddy flow device of electromagnetic eddy flow continuous metal cast process is that 180o semicircle is ring-like, split 360o is ring-like, horseshoe type structure or improvement horseshoe type structure, the fast moving that this one-sided opening or structure that can opening are conducive to electromagnetic eddy flow device is around the mouth of a river, and be conducive to the observation of meniscus in crystallizer and push away slag, choose the routine operations such as slag circle; Be conducive to the smooth enforcement of electromagnetic eddy flow continuous casting; For split 360o ring type structure electromagnetic eddy flow device, one side of the electromagnetic eddy flow device of two semicircle annulars is hinged by hinge, and opposite side can be opened, and allows the mouth of a river enter into closure behind swirl-flow devices center, and fix by certain mode, make it not open.
The present invention can generally use for circle base, square billet and the various process conditions of slab, the design of can be accurately, optimizing, therefore can generally use for circle base, square billet and the various process conditions of slab, can transform original continuous casting installation for casting, only need be in the side of crystallizer or rear or the place ahead independently mobile device and electromagnetic eddy flow device are installed, equipment is simple to operation.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram of the electromagnetic eddy flow continuous metal cast process in the embodiment of the present invention 1;
Fig. 2 is the side view of Fig. 1;
Fig. 3 is the device schematic diagram of the electromagnetic eddy flow continuous metal cast process in the embodiment of the present invention 2;
Fig. 4 is the side view of Fig. 3;
Fig. 5 is the ring-like electromagnetic eddy flow apparatus structure of the split 360o schematic diagram in the embodiment of the present invention; Wherein right figure is that locking device is looked up structural representation;
Fig. 6 is the ring-like electromagnetic eddy flow apparatus structure of the 180o semicircle schematic diagram in the embodiment of the present invention;
Fig. 7 is the horseshoe type electromagnetic eddy flow apparatus structure schematic diagram in the embodiment of the present invention;
Fig. 8 is the improvement horseshoe type electromagnetic eddy flow apparatus structure schematic diagram in the embodiment of the present invention;
Fig. 9 is the horseshoe type electromagnetic eddy flow device action process schematic diagram in the invention process; Wherein left figure is standby position, and right figure is operating position;
Figure 10 is the ring-like electromagnetic eddy flow device action of the split 360o process schematic diagram in the invention process; Wherein left figure is standby position, and right figure is operating position;
In figure, 1, tundish, 2, tundish crossbeam cantilever, 3, pulley, 4, support, 5, tundish chassis crossbeam, 6, tundish chassis, 7, submersed nozzle, 8, horseshoe type electromagnetic eddy flow device, 9, crystallizer cover plate, 10, crystallizer, 11, molten steel, 12, mobile trolley used crossbeam, 13, mobile trolley used crossbeam cantilever, 14, the ring-like electromagnetic eddy flow device of split 360o, 15, mobile trolley used, 16, jointed shaft, 17, first, 18, second portion, 19, locking device.
The specific embodiment
The crystallizer adopting in the embodiment of the present invention is plate slab crystallizer, square blank crystallizer or round mold.
In the embodiment of the present invention locking device of the ring-like electromagnetic eddy flow device of split 360o by being positioned at axostylus axostyle in first, be positioned at screwed fixed bar on second portion, form with the hinged snap close of axostylus axostyle and the nut on fixed bar; In the time of need to locking, axostylus axostyle and fixed bar is close, snap close is pressed on fixed bar, and clamps by nut.
Embodiment 1
The electromagnetic eddy flow device adopting is horseshoe type, and structure as shown in Figure 7;
Electromagnetic eddy flow device is fixed on mobile device; The described mouth of a river is the submersed nozzle between tundish and crystallizer; Described mobile device is the movable pulley mechanism being fixed on tundish chassis;
While carrying out continuous casting, by mobile device, electromagnetic eddy flow device is moved to around the mouth of a river, the molten steel in the mouth of a river is applied to rotary electromagnetic field, make the molten steel in the mouth of a river produce rotation, obtain the uniform mouth of a river and go out stream;
Electromagnetic eddy flow device directly moves to around the mouth of a river by mobile device, makes electromagnetic eddy flow device ring outside around the mouth of a river; The course of work as shown in Figure 9;
Electromagnetic eddy flow device is provided with water collar; The magnetic induction intensity of electromagnetic eddy flow device is 10
-4t, frequency is at 500Hz;
Electromagnetic eddy flow device is positioned at the opposite of manual operation position, crystallizer place;
Movable pulley mechanism comprises tundish crossbeam cantilever, pulley and support; Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley, and pulley and tundish crossbeam cantilever are slidably connected; Cantilever is fixed on tundish chassis crossbeam, and structure as illustrated in fig. 1 and 2.
Embodiment 2
The electromagnetic eddy flow device adopting is that split 360o is ring-like, and structure as shown in Figure 5; The ring-like electromagnetic eddy flow device of split 360o is divided into first and second portion, and the one end between two parts is hinged, and the other end is respectively equipped with supporting locking device;
Electromagnetic eddy flow device is fixed on mobile device; The described mouth of a river is the submersed nozzle between tundish and crystallizer; Described mobile device is the movable pulley mechanism being fixed on mobile trolley used;
While carrying out continuous casting, by mobile device, electromagnetic eddy flow device is moved to around the mouth of a river, the molten steel in the mouth of a river is applied to rotary electromagnetic field, make the molten steel in the mouth of a river produce rotation, obtain the uniform mouth of a river and go out stream;
When electromagnetic eddy flow device is during in standby position, the locking device of electromagnetic eddy flow device is opened; When needs apply magnetic field to mouth of a river molten steel, electromagnetic eddy flow device is moved to around the mouth of a river, locking device is closed and locked, make electromagnetic eddy flow device ring outside around the mouth of a river; The course of work as shown in figure 10;
Electromagnetic eddy flow device is provided with water collar; The magnetic induction intensity of electromagnetic eddy flow device is at 0.5T, and frequency is at 0.1Hz;
Movable pulley mechanism comprises mobile trolley used crossbeam cantilever, pulley and support; Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley, and pulley and mobile trolley used crossbeam cantilever are slidably connected; Mobile trolley used crossbeam cantilever is fixed on mobile trolley used crossbeam; Structure as shown in Figures 3 and 4.
Embodiment 3
The electromagnetic eddy flow device adopting is that 180o semicircle is ring-like, and structure as shown in Figure 6;
Electromagnetic eddy flow device is fixed on mobile device; The described mouth of a river is the long nozzle between ladle and tundish; Described mobile device is the movable pulley mechanism being fixed on mobile trolley used;
While carrying out continuous casting, by mobile device, electromagnetic eddy flow device is moved to around the mouth of a river, the molten steel in the mouth of a river is applied to rotary electromagnetic field, make the molten steel in the mouth of a river produce rotation, obtain the uniform mouth of a river and go out stream;
Electromagnetic eddy flow device is provided with air-cooled cover; The magnetic induction intensity of electromagnetic eddy flow device is 10
-1t, frequency is at 50Hz;
Movable pulley mechanism comprises cantilever, pulley and support; Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley, and pulley and cantilever are slidably connected; Cantilever is fixed on mobile trolley used crossbeam.
Embodiment 4
The electromagnetic eddy flow device adopting is for improving horseshoe type, and two side front ends of electromagnetic eddy flow device are with elbow, and structure as shown in Figure 8;
Electromagnetic eddy flow device is fixed on mobile device; The described mouth of a river is the long nozzle between ladle and tundish; Described mobile device is the movable pulley mechanism being fixed on mobile trolley used;
While carrying out continuous casting, by mobile device, electromagnetic eddy flow device is moved to around the mouth of a river, the molten steel in the mouth of a river is applied to rotary electromagnetic field, make the molten steel in the mouth of a river produce rotation, obtain the uniform mouth of a river and go out stream;
Electromagnetic eddy flow device is provided with water collar; The magnetic induction intensity of electromagnetic eddy flow device is at 1T, and frequency is at 1Hz;
Movable pulley mechanism comprises cantilever, pulley and support; Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley, and pulley and cantilever are slidably connected; Cantilever is fixed on mobile trolley used crossbeam.
Claims (6)
1. an electromagnetic eddy flow continuous cast method, is characterized in that carrying out according to the following steps:
(1) the electromagnetic eddy flow device adopting is that 180o semicircle is ring-like, split 360o is ring-like, horseshoe type or improve horseshoe type; When electromagnetic eddy flow device is split 360o when ring-like, electromagnetic eddy flow device be divided into first and second portion, the one end between two parts is hinged, the other end is respectively equipped with supporting locking device; When electromagnetic eddy flow device is that while improving horseshoe type, two side front ends of electromagnetic eddy flow device are with elbow;
(2) electromagnetic eddy flow device is fixed on mobile device; The described mouth of a river is the submersed nozzle between tundish and crystallizer, or is the long nozzle between ladle and tundish; Described mobile device is the movable pulley mechanism being fixed on tundish chassis, or is fixed on the movable pulley mechanism on mobile trolley used;
(3), while carrying out continuous casting, by mobile device, electromagnetic eddy flow device is moved to the mouth of a river
around, the molten steel in the mouth of a river is applied to rotary electromagnetic field, make the molten steel in the mouth of a river produce rotation, obtain the uniform mouth of a river and go out stream.
2. electromagnetic eddy flow continuous cast method according to claim 1, it is characterized in that when electromagnetic eddy flow device is that 180o semicircle is ring-like, horseshoe type or while improving horseshoe type, electromagnetic eddy flow device directly moves to around the mouth of a river by mobile device, makes electromagnetic eddy flow device ring outside around the mouth of a river; When electromagnetic eddy flow device is split 360o when ring-like, first the locking device of electromagnetic eddy flow device is opened, move to the mouth of a river around after, locking device is closed and locked, make electromagnetic eddy flow device ring outside around the mouth of a river.
3. electromagnetic eddy flow continuous cast method according to claim 1, is characterized in that described electromagnetic eddy flow device is provided with water collar or air-cooled cover, and wherein water collar is outer water collar or interior water collar.
4. electromagnetic eddy flow continuous cast method according to claim 1, is characterized in that described movable pulley mechanism comprises cantilever, pulley and support; Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley, and pulley and cantilever are slidably connected; Cantilever is fixed on tundish chassis or mobile trolley used crossbeam.
5. electromagnetic eddy flow continuous cast method according to claim 1, is characterized in that, when mobile device is the movable pulley mechanism being fixed on tundish chassis cantilever, electromagnetic eddy flow device is positioned at opposite or the side of manual operation position, crystallizer place.
6. electromagnetic eddy flow continuous cast method according to claim 1, is characterized in that the magnetic induction intensity of the rotary electromagnetic field of generation when described electromagnetic eddy flow device is worked is 10
-4~ 1T, the frequency of rotary electromagnetic field is at 0.1 ~ 500Hz.
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| CN105108092A (en) * | 2015-09-02 | 2015-12-02 | 青岛理工大学 | Method for researching movement law of nonmetallic inclusion by stirring magnetic field in continuous casting crystallizer |
| WO2015188573A1 (en) * | 2014-06-10 | 2015-12-17 | 东北大学 | Continuous casting method and device with electromagnetic swirling nozzle |
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| CN106541089A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | Method for reducing slag discharging amount of tundish |
| CN114029463A (en) * | 2021-11-25 | 2022-02-11 | 山东钢铁股份有限公司 | Method for solving segregation of large round billet of special steel |
| CN114131007A (en) * | 2021-12-15 | 2022-03-04 | 东北大学 | Permanent magnet rotational flow continuous casting method |
| CN115709279A (en) * | 2022-10-28 | 2023-02-24 | 东北大学 | Electromagnetic rotation water gap system based on big data and artificial intelligence |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015188573A1 (en) * | 2014-06-10 | 2015-12-17 | 东北大学 | Continuous casting method and device with electromagnetic swirling nozzle |
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| CN114029463A (en) * | 2021-11-25 | 2022-02-11 | 山东钢铁股份有限公司 | Method for solving segregation of large round billet of special steel |
| CN114131007A (en) * | 2021-12-15 | 2022-03-04 | 东北大学 | Permanent magnet rotational flow continuous casting method |
| CN115709279A (en) * | 2022-10-28 | 2023-02-24 | 东北大学 | Electromagnetic rotation water gap system based on big data and artificial intelligence |
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