CN1150069C - Combined electromagnetic crystallizer for conticasting - Google Patents
Combined electromagnetic crystallizer for conticasting Download PDFInfo
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- CN1150069C CN1150069C CNB001102958A CN00110295A CN1150069C CN 1150069 C CN1150069 C CN 1150069C CN B001102958 A CNB001102958 A CN B001102958A CN 00110295 A CN00110295 A CN 00110295A CN 1150069 C CN1150069 C CN 1150069C
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- crystallizer
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- conticasting
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Abstract
The present invention relates to a combined electromagnetic crystallizer for conticasting, which is composed of a crystallizer, a soft contact coil, an electromagnet of a constant stable magnetic field, an electromagnetic stirring device and filling materials, wherein induction coils are placed in a meniscus surface area at the inner side of the crystallizer copper wall, and filled with the filling materials; the single-strip type electromagnet with full width is placed in the water gap zone of the crystallizer; the electromagnetic stirring device is arranged at the lower part zone which closes to the bottom of the crystallizer. The present invention avoids the problems of the shielding effects of the crystallizer wall on the electromagnetic fields and the damage of high temperature molten steel; thereby, soft-contact electromagnetic pressure can be directly exerted on the primary solidification zone for steel melting in the crystallizer; the surface quality of continuously casting blanks is effectively improved, and the present invention has the functions of movable controlling and electromagnetic stirring; the internal quality of the casting blanks is improved.
Description
Technical field
The invention belongs to metallurgy ingot casting equipment, used combined electromagnetic crystallizer for conticasting in particularly a kind of continuous-casting of steel billet.
Background technology
The operation principle of electromagnetic agitating technology is followed two basic laws: electromagnetic induction and current and magnetic field interaction, promptly working as molten steel is in the alternating magnetic field, portion produces induced current within it, and this electric current and externally-applied magnetic field interact and produce magnetic force, promote the molten steel motion.In the crystallizer bottom internal soundness that electromagnetic mixing apparatus can improve strand is set, can makes the equiax crystal district bigger, grainiess is thinner, and central pipe is littler, and center segregation is low.But the main effect that stir the crystallizer bottom just promotes the molten steel motion, improve the solidification and heat transfer condition, can not produce soft contact action to the crystallizer meniscus, can not get rid of the foreign impurity in the molten steel, thus little to the effect of the surface quality of improving continuous casting billet and inner clamps foreign material.The principle of soft-contact mould continuous casting electromagnetic is to utilize the electromagnetic pressure in the electromagnetic field to alleviate the static pressure of molten steel to crystallizer wall, thereby reaches the purpose that molten steel and crystallizer wall solidify under the state of " the soft contact ".The main effect of soft-contact mould technology is to improve slab surface quality, to improving the strand internal soundness, comprises that the eliminating of field trash and the effect that solidified structure is controlled are unsatisfactory.The principle of controlling that flows is to utilize the conduction molten steel to move and cutting magnetic line in constant magnetic field, thereby portion produces induced current within it, this induced current and externally-applied magnetic field interact, and produce the brake force opposite with the molten steel flow direction and control the flow regime of molten steel in crystallizer.Studies show that flow control technique can not only stable meniscus, suppress the speed that the mouth of a river goes out stream, reduce the impact depth of sinking, and can control flow field between the magnetic pole of top and the bottom effectively, and reduce effectively and be mingled with rerum natura slab quality defective, improve the quality of continuous casting billet.But flow control mold is not obvious to improving the slab surface quality action effect, and the purifying of steel of handling through flow control mold below the magnetic pole of bottom has formed piston flow in addition, and this is disadvantageous to solidification and heat transfer.Soft contact technique, flow control technique and electromagnetic agitating technology also are in independent development at present, mutually the stage of not merging.But soft contact technique and the fusion between soft contact technique and the electromagnetic agitating technology from beginning in 1997 provide the foundation for the fusion of this three technology.With regard to the single-phase technology in this three technology, from they action effects separately, soft contact technique stresses solving slab surface quality, flow control technique stresses the separation at external folder thing, and electromagnetic agitating technology stresses in the casting blank solidification organizational controls, and their effect respectively has emphasis that its defective is also respectively arranged.From heat-transfer character, soft contact technique and flow control technique have heat effect to liquid level, improved the last i of field trash and bubble, help their eliminating, electromagnetic agitating technology has then improved the heat transfer condition that forms the molten steel of piston flow after flow control technique purifies, thereby has improved the curing condition of strand.
Summary of the invention
The object of the present invention is to provide and a kind ofly in same crystallizer, can incorporate soft contact technique, flow control technique and electromagnetic agitating technology; Existing soft contact function has mobile control function again to get rid of field trash to improve cc billet surface quality, also has the electromagnetic agitation function to improve the casting blank solidification institutional framework, has multi-functional combined electromagnetic crystallizer for conticasting.
The present invention is made of crystallizer, soft contact induction coil, constant magnetic field electromagnet, electromagnetic mixing apparatus, packing material etc.
The present invention adopts built-in mode with soft contact induction coil, is placed on the inboard meniscus surface area of crystallizer copper wall, fills with packing material.Built-in mode has two kinds: a kind of is that banded flute profile is made in crystallizer copper wall inboard, and induction coil integral body is placed in one, and fills with packing material then; Another kind of mode is that spiral slot is made in crystallizer copper wall inboard, then coil is placed in one, and fills with packing material.Soft contact induction coil can be with 2～6 circles, generally makes of square, garden shape or ellipse garden shape copper pipe, and the appearance insulation, the copper pipe diameter is about 6～12MM, passes to about 20KHZ alternating current, and coil is a hollow-core construction, and inner water flowing is cooled off.Packing material is heat conduction and non electrically conductive material.Full width single bar-type electromagnet (the electromagnet width suitably increases) is placed on the mold gap zone, and feed DC current therein, its voltage must not be higher than safe voltage (36V), generally be selected in 10～20V and be advisable, its current strength is selected to guarantee that the magnetic induction intensity of magnetic field center section is not less than 0.1T.Electromagnetic mixing apparatus is placed on the lower area of crystallizer near the bottom, and passes to low frequency (5～10Hz) alternating currents therein.Induction coil is placed the inboard meniscus surface area of crystallizer copper wall; fill with packing material; both cancelled the crystallizer wall between induction coil and the molten steel; make induction coil can directly correspondingly melt steel; the electromagnetic force that coil is produced directly affacts on the molten steel; completely cut off molten steel with packing material again and contacted, the protection coil with the direct of coil.When induction coil fed the high frequency alternating current, and non-conductive, portion produced induced current and magnetic field is produced shielding action within it owing to a packing material heat conduction, and simultaneously, because it has the capacity of heat transmission, process of setting still can carry out normally.Like this, utilize the soft contact action at meniscus place, improve slab surface quality.Full width wall scroll shape electromagnet is located at the mold gap zone, utilizes this constant magnetic field to come the flow field in the crystallization control device and separate field trash.Electromagnetic mixing apparatus is placed on the crystallizer lower area, and the electromagnetic force of utilizing the low-frequency alternating electric current to produce promotes molten steel and flows, to improve the heat transfer condition of molten steel, to reach the purpose of improving the strand internal soundness.
Structure of the present invention, avoided crystallizer wall to the shielding action of electromagnetic field and the damage problem of high-temperature molten steel, make the electromagnetic pressure of soft contact can directly act on the first solidification zone that melts steel in the crystallizer, improve the surface quality of continuous casting billet effectively, and have the control of flowing and electromagnetic agitation function again, improve the internal soundness of strand.The present invention can be used for slab, also can be used for square billet and rectangular bloom; Can be used for straight mo(u)ld, also can be used for the arc crystallizer; Can be used for the monoblock type vibrating crystallizer, also can be used for split type vibrating crystallizer.Simultaneously, the present invention is simple in structure, convenient processing and manufacture.
Description of drawings
Fig. 1 is a semi-section schematic diagram of the present invention,
Fig. 2 is the semi-section schematic diagram of the mode of establishing in the another kind of coil of the present invention,
The cross-sectional view that Fig. 3 implements on split type vibrating crystallizer for the present invention.
Among the figure: crystallizer copper wall 1, soft contact induction coil 2, constant magnetic field electromagnet 3, electromagnetic mixing apparatus 4, crystallizer outer wall 5, the mouth of a river 6, tundish 7.
The specific embodiment
Embodiment: the application of the present invention on split type vibrating crystallizer.
As shown in Figure 3: meniscus surface area is provided with induction coil 2 in split type vibrating crystallizer copper wall 1, with packing material induction coil and crystallizer are linked together securely, in the mold gap zone constant magnetic field electromagnet 3 is set, and electromagnetic mixing apparatus 4 is set at the crystallizer lower area, like this, just the soft contact technique of crystallizer, flow control technique and electromagnetic agitating technology are combined and constitute split and vibrate the combined electromagnetic crystallizer.Molten steel in the tundish 7,6 enter crystallizer from the mouth of a river, and solidify therein.When at soft contact induction coil, when applying corresponding electric current in constant magnetic field electromagnet and the electromagnetic mixing apparatus respectively, the molten steel at meniscus place will be subjected to the effect of electromagnetic pressure, thereby alleviates the pressure of molten steel to crystallizer wall, is implemented in the purpose of solidifying under the soft contact condition; The molten steel in mold gap zone is subjected to the effect of constant magnetic field, realizes flow regime in the crystallization control device, gets rid of the purpose of field trash; Simultaneously, the molten steel of crystallizer lower area also can correspondingly be subjected to the effect of electromagnetic agitation, quickens MOLTEN STEEL FLOW, improves heat transfer condition.Like this, just make same crystallizer possess multiple function simultaneously, thereby improve the quality of strand effectively.
Claims (5)
1, a kind of crystallizer that includes is at interior combined electromagnetic crystallizer for conticasting, it is characterized in that this crystallizer also includes soft contact induction coil, constant magnetic field electromagnet, electromagnetic mixing apparatus, the non-conductive packing material of heat conduction, induction coil is adopted built-in mode, be placed on the inboard meniscus surface area of crystallizer copper wall, with the non-conductive packing material filling of heat conduction; Full width single bar-type electromagnet is placed on the mold gap zone; Electromagnetic mixing apparatus is placed on the lower area of crystallizer near the bottom.
2, combined electromagnetic crystallizer for conticasting according to claim 1 is characterized in that said induction coil being built in crystallizer copper wall inboard, and its built-in mode has two kinds:
A. banded flute profile is made in crystallizer copper wall inboard, induction coil integral body is placed in one, fill with packing material,
B. spiral slot is made in crystallizer copper wall inboard, then coil is placed in one, fill with packing material.
3, combined electromagnetic crystallizer for conticasting according to claim 1 and 2, it is characterized in that said soft contact induction coil is generally 2～6 circles, make of square, garden shape or ellipse garden shape copper pipe, the appearance insulation, the copper pipe diameter is about 6～12MM, coil is a hollow-core construction, and inner water flowing is cooled off, and passes to the alternating current of about 20KHZ to coil.
4, combined electromagnetic crystallizer for conticasting according to claim 1, it is characterized in that the said electric current that feeds to full width wall scroll shape electromagnet is a direct current, voltage must not be higher than safe voltage, and current strength is selected to guarantee that the magnetic induction intensity of magnetic field center section is not less than 0.1T.
5, combined electromagnetic crystallizer for conticasting according to claim 1 is characterized in that passing to the low-frequency ac electric current to the electromagnetic mixing apparatus that places the crystallizer lower area, and frequency is 5～10Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001102958A CN1150069C (en) | 2000-04-07 | 2000-04-07 | Combined electromagnetic crystallizer for conticasting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001102958A CN1150069C (en) | 2000-04-07 | 2000-04-07 | Combined electromagnetic crystallizer for conticasting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1302703A CN1302703A (en) | 2001-07-11 |
| CN1150069C true CN1150069C (en) | 2004-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001102958A Expired - Fee Related CN1150069C (en) | 2000-04-07 | 2000-04-07 | Combined electromagnetic crystallizer for conticasting |
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| CN (1) | CN1150069C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345644C (en) * | 2005-01-12 | 2007-10-31 | 宝山钢铁股份有限公司 | Method for sealing lancing type crystallizer copper pipe using extrusion distortion |
| CN100345645C (en) * | 2005-01-12 | 2007-10-31 | 宝山钢铁股份有限公司 | Method for sealing lancing type crystallizer copper pipe using electromagnetic pressure |
| CN100333861C (en) * | 2005-09-13 | 2007-08-29 | 上海大学 | High temperature gradient layer-by-layer solidifying continuously casting process |
| CN106493329B (en) * | 2016-11-18 | 2018-06-29 | 辽宁科技大学 | A kind of production method and device of efficient control continuous casting bleed-out |
| CN107008873B (en) * | 2017-04-11 | 2020-01-17 | 上海大学 | Method and device for preparing multi-mode electromagnetic field homogenized metal continuous casting billet |
| CN109967709B (en) * | 2019-04-24 | 2020-01-03 | 燕山大学 | Combined type coil crystallizer electromagnetic stirrer |
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2000
- 2000-04-07 CN CNB001102958A patent/CN1150069C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1302703A (en) | 2001-07-11 |
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