CN101244451A - Method and apparatus for improving horizontal continuous casting billet quality by applying composite field - Google Patents
Method and apparatus for improving horizontal continuous casting billet quality by applying composite field Download PDFInfo
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- CN101244451A CN101244451A CNA2008100107361A CN200810010736A CN101244451A CN 101244451 A CN101244451 A CN 101244451A CN A2008100107361 A CNA2008100107361 A CN A2008100107361A CN 200810010736 A CN200810010736 A CN 200810010736A CN 101244451 A CN101244451 A CN 101244451A
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Abstract
The invention relates to a quality improving method for horizontal continuous casting blanks by applying complex field and the device, belonging to the technical field of preparation of metal material, in particular to the technology of applying complex electromagnetic field and ultrasonic field in the continuous casting process of metal casting blanks. The device is characterized in that a generator of inert gas is arranged at the center of the bottom of a holding furnace; a generator of traveling wave magnetic field is arranged on the side of the holding furnace; a power ultrasonic device is arranged on the holding furnace close to the water port; a restriction electromagnetic coil is arranged on the outer side of a crystallizer. The device has the advantages that: firstly, the production technology is simple, the operation is easy, and the efficiency is high; secondly; the disadvantages of easy broken in rolling and drawing process of casting blank due to more impurity and pores is solved; thirdly, the solidification structure of the casting blanks is uniform, the crystal grain is fine, and the casting blanks can be rolled directly at casting state. The quality improving method and the device are mainly used for the field of metal continuous casting.
Description
Technical field
The invention belongs to technical field of metal material preparation, specially refer to continuous casting of metal.
Background technology
China has leapt to world's metal material and has produced first at present, but compare with developed country, still exist quality material production capacity low, energy consumption is big, environmental pollution is serious, problems such as basic research and new technology development do not catch up with have directly restricted China's economy and development of technologies.Improving the metal material quality of China, reduce energy consumption, is new demand and the challenge that the metallurgical industry of China is proposed.The continuous casting ratio of China surpasses 90%.But defectives such as the surface vibration trace of existing continuous casting billet, crackle, segregation, inner inclusion make it can not satisfy the demand of modern industry to the high-quality strand; Also hinder the application of continuous casting and rolling process for production.Horizontal continuous casting technology is regarded as preparing the continuous casting mode of high-quality strand gradually, be particularly suited near net shape continuous casting, its device structure is simple, in light weight, small investment but horizontal casting also exist the circumferential tissue odds of strand spare, be mingled be difficult for removing, inside exists that shrinkage cavity is loose, surface quality remains shortcomings such as improvement, solute element segregation.There are a lot of researchs to be devoted to improve horizontal continuous casting billet quality in recent years, wish that the strand that obtains can be directly used in follow-up technologies such as rolling and drawing.
For example, in order to obtain high-quality horizontal continuous-casting blank, disclosed patent 200510032537.7 had proposed a kind of strand horizontal casting electromagnetic agitation method in 2007, in this technology, do not consider the crystallizer electromagnetic agitation, but the district that rises again arranges two cold-zone magnetic stirrers behind crystallizer, reach the purpose that enlarges strand equiax crystal district, add the solidification end electromagnetic agitation again,, improve strand center equiaxial crystal ratio with tissue defects such as the component segregation that improves strand, centre burst, layerings.But this kind method is to the improvement of casting blank solidification tissue, and limited to inclusion removal effect in the strand, the equipment of required electromagnetic field is huge, the preparation cost height.
The seminar at applicant place in 2006 has proposed to apply the method for power ultrasonic in horizontal casting device holding furnace in the article " Study of ultrasonic melt treatment on the quality of horizontal continuouslycast Al-1%Si alloy " of " Ultrasonics Sonochemistry " publication.This method can improve melt uniformity in the holding furnace, improves cc billet surface quality, suppresses the melt segregation, but apply the ultrasonic field sphere of action separately and effect limited.
Summary of the invention
The purpose of this invention is to provide a kind of method and apparatus that horizontal continuous casting billet quality is improved in the compound field of applying of electromagnetic field and ultrasonic field that applies simultaneously.
Principle of the present invention is,
1. in horizontal casting device holding furnace bottom centre the inert gas bubble generator is set,, can effectively removes gas and field trash in the metal bath in the holding furnace, remove the efficient height simultaneously at holding furnace arranged outside travelling-magnetic-field generating means.The dividing potential drop of gas molecule in the inert gas bubble is zero in the metal bath, therefore in the process of inert gas bubble floating, gas molecule spreads to bubble from melt, simultaneously, inclusion particle in the metal bath also can be adsorbed on the bubble, float with it, thereby the gas removed in the melt and the purpose of field trash have been reached, but because this kind method inert gas bubble is bigger, ascent rate is fast, make gas short diffusion time, field trash and bubble hit probability are little, and gas and inclusion removal efficient are lower.Travelling-magnetic-field can produce forced convertion in metal bath, the inert gas bubble is smashed, and makes it more evenly tiny, and come-up has increased its stroke and floating interval of floating dock in a spiral manner, thereby helps that gas fully spreads to the inert gas bubble in the metal bath.The probability of field trash and inert gas bubble hit increases greatly, and inclusion removal is effective.
2. near place, the mouth of a river power ultrasonic device is set at horizontal casting device holding furnace, power ultrasonic and metal bath interact can produce cavitation effect and acoustic streaming effect.Cavitation effect can produce many cavitation bubbles in metal bath, gas spreads to cavitation bubble from metal bath, cavitation bubble is grown up gradually, it floats to the molten metal surface when bubble is enough big, reaches the purpose of degassing, and inclusion particle is adsorbed on bubble surface on the one hand in the metal bath simultaneously, with bubble floating, on the other hand, cavitation and acoustic streaming effect have increased the collision probability between the field trash, make its gathering grow up and float.Cavitation and acoustic streaming effect can produce stirring in melt, make the melt temperature homogenising, improve the nucleation rate of liquid metal, thereby improve cc billet surface quality, refinement the strand grain structure, suppress the strand solute segregation.
3. a constraint solenoid is placed in the horizontal casting device crystallizer outside, the electromagnetic pressure that coil produces can alleviate the pressure that contacts between molten metal and the crystallizer wall, thereby alleviated the vibration mark of casting billet surface, improve cc billet surface quality, simultaneously molten metal carries out forced convection under the effect of electromagnetic field, has increased the crystal grain nucleation rate, and constrained dendritic growth can be smashed, make the solidified structure refinement, the strand solute segregation is inhibited.
Technical solution of the present invention is, at holding furnace 4 bottom centre positions inert gas bubble generator 12 is set, simultaneously travelling-magnetic-field generator 5 is set at holding furnace 4 sidepieces, near the casting making-port power ultrasonic tool heads 3 is set at holding furnace 4, at crystallizer 7 arranged outside constraint solenoid 18.The molten metal 6 for preparing is poured in the horizontal casting device holding furnace 4, open the switch of holding furnace 4 bottom centre position inert gas bubble generators 12, connect the power supply of the travelling-magnetic-field generator 5 that is arranged on holding furnace 4 outsides simultaneously, blow a period of time, close the switch of inert gas bubble generator 12, close the power supply of travelling-magnetic-field generator 5, starting power Vltrasonic device power supply 2, after molten metal 6 reaches uniform temperature, open the switch of a cold water jacket 11 that is arranged on constraint solenoid 10 outsides, connection is arranged on the power supply of the constraint solenoid 10 in crystallizer 7 outsides, connect the power supply of draw-gear 9, open the switch of the secondary cooling water cover 8 that is arranged on crystallizer 7 the place aheads, thereby obtain the metal strand of good quality.
Step is:
1. in resistance furnace, deposite metal liquid;
With pouring metal melt in horizontal casting holding furnace 4, open the switch of holding furnace 4 bottom centre position inert gas bubble generators 12, gassing time is 5-20min, flow is 1-3L/min, connect the power supply of the travelling-magnetic-field generator 5 that is arranged on holding furnace 4 outsides simultaneously, the travelling-magnetic-field frequency is 10-60Hz, and power is 1-3kw;
3. starting power Vltrasonic device power supply 2, supersonic frequency is 10-30kHz, ultrasonic power is 100-1000W, the material of tool heads 3 is stainless steel or pottery, it is 10-30mm that tool heads 3 immerses molten metal 6 degree of depth, when tool heads 3 materials are stainless steel, the TiN film of surface coating 2 μ m, when the temperature of molten metal 6 is 700-750 ℃, open the switch of a cold water jacket 11 that is arranged on constraint solenoid 10 outsides, connection is arranged on the power supply of the constraint solenoid 10 in crystallizer 7 outsides, and supply frequency is 10-70Hz, and the constraint solenoid is 40-120A by size of current;
Connect the power supply of draw-gear 9, hauling speed is 60-140mm/min, opens the switch of the secondary cooling water cover 8 that is arranged on crystallizer 7 the place aheads, and cooling water flow is 30-60L/h;
The present invention has the following advantages and effect: 1, in horizontal casting device holding furnace bottom centre the inert gas bubble generator is set, simultaneously can in holding furnace, produce forced convertion at holding furnace arranged outside travelling-magnetic-field generating means, bubble is smashed, increase its stroke and floating interval of floating dock, effectively removed gas and field trash in the metal bath in the holding furnace.2, near place, the mouth of a river power ultrasonic device is set at horizontal casting device holding furnace, because ultrasonic cavitation and acoustic streaming effect make place, mouth of a river melt temperature homogenising, the metal nucleation rate increases, suppress the strand solute segregation, improve cc billet surface quality, can remove gas and field trash in the strand.3, a constraint of horizontal casting device crystallizer arranged outside solenoid, the electromagnetic pressure that coil produces can alleviate the pressure that contacts between molten metal and the crystallizer wall, molten metal is produced stirring action, thereby alleviated the vibration mark of casting billet surface, improve cc billet surface quality, thinning solidification structure suppresses the strand solute segregation.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is a compound horizontal casting metal stock theory structure schematic diagram of the present invention.
Among the figure, 1. power ultrasonic transducer, 2. power ultrasonic power supply, 3. power ultrasonic tool heads, 4. holding furnace, 5. travelling-magnetic-field generator, 6. molten metal, 7. crystallizer, 8. secondary cooling water cover, 9. draw bar 10. retrains solenoid, 11. 1 cold water jackets, 12. inert gas bubble generators.
The specific embodiment
By retraining solenoid 10 in crystallizer 7 arranged outside power frequencies, simultaneously inert gas bubble generator 12 is set in holding furnace 4 bottom centre, at holding furnace 4 sidepieces travelling-magnetic-field generator 5 is set, near the casting making-port power ultrasonic equipment 7 is set at holding furnace 4, the Al-1%Si bonding line blank of preparation Φ 10mm, concrete steps are as follows:
The preparation of step 1:Al-1%Si alloy
In resistance furnace, prepare the Al-1%Si alloy with commercial-purity aluminium and aluminium silicon intermediate alloy, alloy melting to 780 ℃;
Horizontal continuous-casting under the compound field action of step 2:Al-1%Si bonding line blank
Alloy is poured in the holding furnace 4, open inert gas bubble generator 12 switches, open travelling-magnetic-field generator 5, gassing time is 10min, flow is 2L/min, air blowing is closed travelling-magnetic-field generating means 12 after finishing, starting power Vltrasonic device power supply 2, and its frequency is 20kHz, power is 600W, when molten metal 6 temperature are 730 ℃, open a cold water jacket 11 switches, to 10 energisings of constraint solenoid, electric current is 100A, with the speed pulling draw bar 9 of 100mm/min, to open secondary cooling water and overlap 8 switches, cooling water inflow is 40L/h.When the bonding line base reaches requirement length, cut off the electricity supply, close cooling system, shut down.
Step 3: quality examination
Observe the metal strand, compare with the strand that does not apply compound, surface quality obviously improves, get one section sample at continuous casting material middle part, metallographic structure observed in section polishing, corrosion back, apply compound after, casting solidification is organized obvious refinement, solute segregation is inhibited, and inclusion content reduces, and pore obviously reduces.
Claims (6)
1. one kind applies the device that horizontal continuous casting billet quality is improved in compound field, it is characterized in that, at holding furnace (4) bottom centre position inert gas bubble generator (12) is set, simultaneously travelling-magnetic-field generator (5) is set at holding furnace (4) sidepiece, near the casting making-port power ultrasonic tool heads (3) is set at holding furnace (4), at crystallizer (7) arranged outside constraint solenoid (18).
2. use and according to claim 1ly a kind ofly apply compound field and improve the horizontal continuous casting method that the device of horizontal continuous casting billet quality carries out, it is characterized in that, the molten metal (6) for preparing is poured in the horizontal casting device holding furnace (4), open the switch of holding furnace (4) bottom centre position inert gas bubble generator (12), connect the power supply of the travelling-magnetic-field generator (5) that is arranged on holding furnace (4) outside simultaneously, blow a period of time, close the switch of inert gas bubble generator (12), close the power supply of travelling-magnetic-field generator (5), starting power Vltrasonic device power supply (2), after molten metal (6) reaches uniform temperature, open the switch of a cold water jacket (11) that is arranged on constraint solenoid (10) outside, connection is arranged on the power supply of the constraint solenoid (10) in crystallizer (7) outside, connect the power supply of draw-gear (9), open the switch of the secondary cooling water cover (8) that is arranged on crystallizer (7) the place ahead, obtain the metal strand of good quality.
3. a kind of method that horizontal continuous casting billet quality is improved in compound field that applies according to claim 2, it is characterized in that, place inert gas bubble generator (12) at holding furnace (4) bottom centre position, gassing time is 5-20min, gas flow is 1-3L/min, apply travelling-magnetic-field (5) in holding furnace (4) outside simultaneously, the travelling-magnetic-field frequency is 10-60Hz, and power is 1-3kw.
4. a kind of method that horizontal continuous casting billet quality is improved in compound field that applies according to claim 2, it is characterized in that, place power ultrasonic generator (3) at holding furnace (4) near the casting making-port, supersonic frequency is 10-30kHz, ultrasonic power is 100-1000W, and tool heads (3) material is stainless steel or pottery, and it is 10-30mm that tool heads (3) immerses molten metal (6) degree of depth, when tool heads (3) material is stainless steel, the TiN film of surperficial coating 2 μ m.
5. a kind of method that horizontal continuous casting billet quality is improved in compound field that applies according to claim 2 is characterized in that at crystallizer (7) arranged outside constraint solenoid (10), its power frequency is 10-70Hz, and size of current is 40-120A.
6. a kind of method that horizontal continuous casting billet quality is improved in compound field that applies according to claim 2, it is characterized in that, in crystallizer (7) the place ahead draw-gear (9) is set, its hauling speed is 60-140mm/min, in crystallizer (7) the place ahead two cold but water jackets (8) are set, cooling water flow is 30-60L/h, and molten metal (6) pouring temperature is 700-750 ℃.
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| CN101844212A (en) * | 2010-05-19 | 2010-09-29 | 中南大学 | Electromagnetic/ultrasound compound outfield continuous casting and rolling device |
| CN101905295A (en) * | 2010-08-05 | 2010-12-08 | 安徽工业大学 | Continuous casting crystallizer device using ultrasonic vibration |
| CN102189103A (en) * | 2011-03-01 | 2011-09-21 | 大连理工大学 | Light alloy electromagnetic ultrasonic casting and rolling integration device and method |
| CN102284686A (en) * | 2011-08-24 | 2011-12-21 | 东北大学 | Continuous casting device and method of large-size magnesium alloy plate blank by action of combined outfield |
| CN102294453A (en) * | 2011-09-15 | 2011-12-28 | 中南大学 | Multi-energy field casting-rolling preparation method of magnesium alloy slab strip |
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| CN101905295A (en) * | 2010-08-05 | 2010-12-08 | 安徽工业大学 | Continuous casting crystallizer device using ultrasonic vibration |
| CN102189103A (en) * | 2011-03-01 | 2011-09-21 | 大连理工大学 | Light alloy electromagnetic ultrasonic casting and rolling integration device and method |
| CN102284686A (en) * | 2011-08-24 | 2011-12-21 | 东北大学 | Continuous casting device and method of large-size magnesium alloy plate blank by action of combined outfield |
| CN102294453A (en) * | 2011-09-15 | 2011-12-28 | 中南大学 | Multi-energy field casting-rolling preparation method of magnesium alloy slab strip |
| CN102489676A (en) * | 2011-12-26 | 2012-06-13 | 大连理工大学 | Ultrasonic and electromagnetic block-type amorphous alloy continuous casting device and method thereof |
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| CN102962414A (en) * | 2012-11-20 | 2013-03-13 | 东北大学 | Continuous casting device and method for large-dimension aluminum alloy plate blank |
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Open date: 20080820 |