CN1332773C - Improved method of vibration exciting metal liquid shape crystal nucleus and its device - Google Patents
Improved method of vibration exciting metal liquid shape crystal nucleus and its device Download PDFInfo
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- CN1332773C CN1332773C CNB2005101342948A CN200510134294A CN1332773C CN 1332773 C CN1332773 C CN 1332773C CN B2005101342948 A CNB2005101342948 A CN B2005101342948A CN 200510134294 A CN200510134294 A CN 200510134294A CN 1332773 C CN1332773 C CN 1332773C
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Abstract
The present invention relates to the field of metal casting, which provides an improved method for exciting nucleation in molten metal by vibration. The method comprises the steps that at least one crystal nucleus ejector keeping in high-frequency small-amplitude vibration is immersed in molten metal 9 before casting or continuous casting, so that the front end of the crystal nucleus ejector rapidly forms a great number of solid-phase crystal nuclei 8; the solid-phase crystal nuclei 8 are ejected into the molten metal 9 to form crystal nuclei 8 generating a lot of equiaxed crystals in process of metal solidification thereafter. The method of the present invention is characterized in that the crystal nuclear ejector is self-consuming cold metal material 2 continuously entering the molten metal 9. The method of the present invention can simplify equipment and technological process, not only can reduce the superheat of the molten metal in a crystallizer, but also can promote formation of solidification nucleation, so that the equiaxed crystal rate of continuous casting billets can be improved, and then, the purposes of obviously improving the center bores and the looseness of the continuous casting billet and reducing the segregation can be obtained.
Description
Technical field
The invention belongs to field of metal casting technology, particularly a kind of by the vibrational excitation forming core, to improve the method and the device of continuous casting billet equiaxial crystal ratio.
Background technology
In the continuous casting production technology of existing metal, because choosing divides the continuous casting billet center mass that crystallization caused to reduce in the process of setting, especially problem such as high-alloy steel, center segregation that high-carbon steel foundry goods and continuous casting billet produced, central pipe, center porosity becomes the key problem that influences the rear portion mill bar quality.In order to address the above problem, developed many patents and technology at this technical elements for a long time, these patents and technology are mainly around two cores: the one, reduce the degree of superheat, as technology such as the heating of tundish plasma molten steel, tundish eddy-current heating; The 2nd, promote to solidify nucleus and form, as electromagnetic agitating technology, electro-pulse modification treatment technology, the broken dendrite technology of ultrasonic vibration etc.
About tundish molten steel heating technique a large amount of technology are arranged both at home and abroad, as United States Patent (USP) 5,963,579, Japan Patent JP 03 138052 A etc. are about plasma tundish heating technique, United States Patent (USP) 4,582,531st, tundish eddy-current heating example, but because problem such as plasma heating exists atmosphere and difficult control of temperature, eddy-current heating to exist anti-material to corrode and efficiency of energy utilization is low, technology keeps stagnating substantially.
About promoting the forming core technical elements, China Patent No. ZL 99250649.2 and ZL 01106053.0 are the typical usings method of continuous cast mold magnetic stirrer, their feature all is to place electromagnetic induction coil or agitator in the outside of continuous cast mold, when electromagnetic induction coil or agitator feed the alternating current of certain frequency, will generate an electromagnetic field, this magnetic field penetration copper plate of crystallizer and metal freezing shell also produce induced current in liquid metal, liquid metal is equivalent to a carrying object, this carrying object is acted on by again in magnetic field, just in carrying object, produce electromagnetic force, thereby make liquid metal produce forced convection, the liquid metal that flows will wash away the forward position of solidified shell, and fracture and broken dendrite, these fracture and broken dendrite will become after the core of equiax crystal growth, thereby reached the purpose of magnetic stirrer raising strand equiaxial crystal ratio.The application of magnetic stirrer is the effective ways that improve the strand internal soundness.But in use also there is certain shortcoming in it, the one, and electromagnetic agitation makes strand produce " white band " or negative segregation band easily, has influenced the uniformity of strand performance; The 2nd, the energy loss behind the magnetic stirrer penetrating metal shell is big, and along with the thickening of continuous casting billet base shell, the energy that the penetration by electromagnetic fields metal-back is lost is also big more, and effect reduces.
Ultrasonic vibration be used to improve metal casting solidified structure research and report for work more also relatively early, ultrasonic wave is often referred to the high frequency sound wave of vibration in 1 second more than 20000 times.The 16th volume the 3rd phase 9-13 page or leaf report of a piece " ultrasonic vibration is to influence of casting alloy crystallization process " of having reported for work in " institute of Shenyang Institute of Technology newspaper " September in 1997, the dendrite in the base shell forward position that its molten metal of thinking that the ultrasonic wave introducing is being solidified can broken solidify, and the core of forming core after it is become, and the distance that requires ultrasonic wave emission source and solidified shell is near more good more, otherwise effect is relatively poor.The major defect of this method has three: the one, and shorter as the described ultrasonic wave operating distance of this article; The 2nd, can only act on fragmentation solidified shell, can not act on not solidified molten metal; The 3rd, for resembling refractory metals such as molten steel, how the ultrasonic wave emission source keeps service life.
In order to improve casting or casting process equiaxial crystal ratio, the present inventor has proposed initiative technical scheme, is to place the nucleus transmitter that has cooling capacity, keeps little amplitude, dither in the molten metal before casting or continuous casting.Because cooling effect, metal liquid be rapid forming core on the nucleus transmitter; Simultaneously, these nascent nucleus will in a large number, continuously be launched in the metal liquid along with the dither of nucleus transmitter, form the core that generates a large amount of equiax crystal in the metal solidification process thereafter.This is invented and has submitted application number on December 29th, 2004 is the Chinese invention patent application of 200410102672.x, and exercise question is " a kind of method and apparatus that excites the metal forming core ".But the nucleus transmitter in this invention need connect the pipeline of the cooling medium that recycles etc., device structure complexity in the back; If there is not the circulation of continuous cooling medium, this nucleus transmitter is after continuing to use a period of time, and temperature rises, and cooling capacity descends, and molten metal is with the very fast blocked up scull that forms on the nucleus transmitter.
In addition, in order to improve yield of alloy or to impel the needs of steel inclusion sex change, produced wire-feeding technique in the more crystallizer, as U.S. Patent number 4,047,556,4,143,211, but its feeding line all is to turn to purpose with alloy, and the alloy wire of feeding comprises Al, Mo, Ca, Ti, Zr, B, REM, V, Nb etc., when some special steel grade of actual production such as weathering steel, feeding REM becomes the effective means of sulphide inculsion sex change in the crystallizer.The purpose that it should be noted that the feeding alloy wire is not to improve equiaxial crystal ratio in order to increase forming core.
Summary of the invention
The object of the present invention is to provide a kind of method and device of improved vibration exciting metal liquid shape crystal nucleus, can simplified apparatus and technological process, can either reduce the crystallizer inner metal liquid degree of superheat, promote the formation solidify nucleus again, thereby improve the continuous casting billet equiaxial crystal ratio, to reach obvious continuous casting billet central pipe and the purpose loose, that reduce segregation improved.
According to above-mentioned purpose, the technical solution that the present invention proposes is:
The invention provides a kind of method of improved vibration exciting metal liquid shape crystal nucleus, comprise the steps: at least one is kept making to form nascent nucleus 8 rapidly in the nucleus transmitter front-end in the nucleus transmitter immersion casting or the molten metal 9 before the continuous casting of high frequency, small amplitude motion; Above-mentioned nucleus 8 is launched in the molten metal 9, forms the nucleus 8 that generates a large amount of equiax crystal in the metal solidification process thereafter; Its improvement is: described nucleus transmitter is for entering the consumable formula metal cold burden 2 of above-mentioned molten metal 9 continuously; Wherein: when described cold burden 2 front ends touch above-mentioned molten metal 9, cold burden 2 is melted, make near the zone cold burden 2 form solid-liquid two phase mixtures 7, form a large amount of free solid-phase grains in this mixed zone, these free crystal grain in a large number, are continuously launched in the metal liquid under the dither effect, become the nucleus 8 in the metal continuous solidification process.
Another aspect of the present invention has provided a kind of device of improved vibration exciting metal liquid shape crystal nucleus, comprising: a) at least one makes molten metal 9 form necessarily cold excessively nucleus transmitter; B) vibrating mechanism 4: link to each other with the nucleus transmitter, drive described nucleus transmitter and produce high frequency, small amplitude motion; Its improvement is: described nucleus transmitter is for entering the consumable formula metal cold burden 2 of above-mentioned molten metal 9 continuously, the cold burden 2 that described vibrating mechanism 4 drives in the molten metal 9 is done high frequency, small amplitude motion, make that cold burden is melted, and near the zone cold burden 2 forms solid-liquid two phase mixtures 7, form a large amount of free solid-phase grains in this mixed zone, these free crystal grain in a large number, are continuously launched in the metal liquid under the dither effect, become the nucleus 8 in the metal continuous solidification process.
In sum, the invention provides a kind of consumable formula vibrational excitation forming core method and apparatus, by cold burden at crystallizer internal vibration feeding metal bar or band, cold burden is when self successively melting consumption, reduce molten steel overheat, and this consumable formula cold burden is under dither, when the cold burden front end touches molten metal, cold burden is heated fusing, simultaneously will form a solid-liquid two-phase region in cold burden near surface zone, have a large amount of solid-phase grains in the two-phase section, they will be along with the dither quilt of nucleus transmitter is a large amount of, continuously launch in the metal liquid, form the core that generates a large amount of equiax crystal in the metal solidification process.Under these two kinds of effects, reach and improve foundry goods equiaxial crystal ratio, minimizing strand segregation and loose purpose.
A distinguishing feature of the present invention is successively fed the cold burden in the crystallizer molten metal, under the driving of vibration generation source, produce the high frequency small amplitude motion, the Oscillation Amplitude of its cold burden is 0.001～1mm, vibration frequency is 5～10000Hz, so that, play the effect that molten metal solidifies the forming core core with a large amount of the launching in the crystallizer molten metal of the solid metal particle in the cold burden front end solid-liquid two-phase region.The vibration generation source that drives the vibration of feeding cold burden can be motor-driven, also can be hydraulically powered, also can be compressed gas-driven.
The present invention is applicable to the process of setting processing of the molten metal of steel and non-ferrous metal simultaneously.
Compared with prior art, the method and apparatus of the consumable formula vibrational excitation forming core that the present invention obtains both can overcome the generation of the process of setting negative segregation that the electromagnetic agitation improper use caused, can overcome again ultrasonic vibration operating distance short, can only broken dendrite, can't handle the shortcoming of liquid metal, and simplified apparatus and technological process, reduction reduces cost; The present invention can not only eliminate a large amount of metal degrees of superheat, can provide a large amount of nucleus again simultaneously, thereby reaches the purpose that improves equiaxial crystal ratio, can improve strand central pipe and loose, improves the continuous casting billet internal soundness.
Description of drawings
Fig. 1 is the schematic diagram of a kind of consumable formula of the present invention vibrational excitation forming core apparatus and method
Fig. 2 is that feeding rod or the vibration of band cold burden produce the nucleus schematic diagram
Reference numeral:
The 1-uncoiler
Rod (band) cold burden of 2-feeding
The 3-straightener
The 4-vibrating mechanism
The 5-vibration generation source
The 6-crystallizer
The 9-molten metal
The 10-submersed nozzle
7-cold burden front end solid-liquid two-phase region
The 8-nucleus
9-crystallizer inner metal liquid
The specific embodiment
Be further described in detail below in conjunction with the specific embodiment of accompanying drawing invention.
The device of this invention is formed (see figure 1) by four parts: cold burden decoiling equipment, cold burden straightener, high frequency small amplitude motion generating means and vibration transmission and acting device.Wherein: through the effect of decoiling equipment 1, align after cold burden 2 uncoilings of composition in claimed range and at straightener 3, do the high frequency small amplitude motion, successively feed crystallizer interior 6 then by vibration generation source 5 and vibrating device 4.(see figure 2) when cold burden feeds crystallizer 6 with vibration mode, the front end of cold burden contacts with crystallizer inner metal liquid 9, when constantly fusing consumption of cold burden self, reducing the molten metal degree of superheat, form solid-liquid two phase mixtures 7 in the cold burden forward position, produce a large amount of free solid-phase grains in the mixed zone, these free crystal grain in a large number, are continuously launched in the metal liquid under the dither effect, become the nucleus 8 in the metal continuous solidification process.Because the feeding of cold burden greatly reduces the metal degree of superheat, the crystal grain of two-phase section generation simultaneously is continuously to offer the crystallizer inner metal liquid, therefore the nucleus that is launched in the molten metal by the nucleus transmitter is preserved major part get off, be not melted, and form the core that generates a large amount of equiax crystal in the metal solidification process thereafter.
According to the size of crystallizer section, can choose the cold burden 2 of different section, when crystallizer section little (as square billet or shaped blank crystallizer), the molten metal degree of superheat are low, can choose the light section bar, as be of a size of φ 10～φ 30mm; The crystallizer section is big, when the molten metal degree of superheat is high, can choose big section bar, as is of a size of φ 30～φ 50mm.For continuous casting crystallizer for plate billet, because the crystallizer space is bigger, also can choose the shaped like narrow cold burden, its size is about thick 2～35mm, wide 30～350mm; Use as bar-shaped cold burden, the crystallizer section is little, when the molten metal degree of superheat is hanged down, can choose light section band material, as be of a size of thick 2～15mm, wide 30～150mm; The crystallizer section is big, when the molten metal degree of superheat is high, can choose big section band material, as is of a size of thick 15～35mm, wide 100～350mm.The one-tenth component selections of cold burden 2 can be identical with the metal ingredient of being poured into a mould or close, its objective is that not influence the product ultimate constituent be principle, makes within the product composition control range.
In use cold burden feeds crystallizer behind decoiling equipment, straightener, and cold burden can also can feed in the both sides of submersed nozzle simultaneously immersing the side feeding crystallizer at the mouth of a river 10.The feeding speed of cold burden is restricted by the factor of two aspects: the one, and the burn-off rate of cold burden, the cold burden that promptly will guarantee to feed in the molten metal is fully melted in short zone, top; The 2nd, do not produce the volume slag, when cold burden feeding excessive velocities, the covering slag that covers the molten metal surface will be adsorbed on the cold burden surface, and together be brought in the molten metal, form the volume slag; Therefore the feeding speed of cold burden to fully be melted with the covering slag that is adsorbed on the cold burden surface and on to float in the liquid slag layer be standard.Therefore, different according to the difference of conticaster pulling rate and cold burden size, the feeding speed of cold burden is generally 0.1～8m/min, and low pulling rate, big section cold burden adopt lower feeding speed, for example 0.1～3m/min; High pulling rate, light section cold burden adopt higher feeding speed, for example 3～8m/min.
Claims (13)
1. the method for an improved vibration exciting metal liquid shape crystal nucleus comprises the steps:
At least one is kept making to form nascent nucleus (8) rapidly in the nucleus transmitter front-end in the nucleus transmitter immersion casting or the molten metal (9) in the casting process of high frequency, small amplitude motion; Above-mentioned nucleus (8) is by being launched in the molten metal (9), forms the nucleus (8) that generates a large amount of equiax crystal in the metal solidification process thereafter;
It is characterized in that:
Described nucleus transmitter is for entering the consumable formula metal cold burden (2) of above-mentioned molten metal (9) continuously; Wherein: when described cold burden (2) front end touches above-mentioned molten metal (9), cold burden (2) is melted, make near the zone cold burden (2) form solid-liquid two phase mixtures (7), form a large amount of free solid-phase grains in this mixed zone, these free crystal grain in a large number, are continuously launched in the metal liquid under the dither effect, become the nucleus (8) in the metal continuous solidification process.
2. method according to claim 1 is characterized in that: described cold burden (2) also comprises uncoiling and aligning step before entering molten metal (9).
3. method according to claim 1 is characterized in that: the Oscillation Amplitude of described cold burden (2) is 0.001～1mm, and vibration frequency is 5～10000Hz.
4. method according to claim 1 is characterized in that: the feeding speed of described cold burden is 0.1～8m/min.
5. method according to claim 1 is characterized in that, described cold burden (2) composition is identical or close with the composition of molten metal (9).
6. method according to claim 1, described molten metal (9) is molten steel or non-ferrous metal liquid.
7. the device of an improved vibration exciting metal liquid shape crystal nucleus comprises:
A) at least one makes molten metal (9) form necessarily cold excessively nucleus transmitter;
B) vibrating mechanism (4): link to each other with the nucleus transmitter, drive described nucleus transmitter and produce high frequency, small amplitude motion;
C) vibration generation source (5): link to each other with vibrating mechanism (4).
It is characterized in that:
Described nucleus transmitter is for entering the consumable formula metal cold burden (2) of above-mentioned molten metal (9) continuously, the cold burden (2) that described vibrating mechanism (4) drives in the molten metal (9) is done high frequency, small amplitude motion, make that cold burden is melted, and near the zone cold burden (2) forms solid-liquid two phase mixtures (7), form a large amount of free solid-phase grains in this mixed zone, these free crystal grain in a large number, are continuously launched in the metal liquid under the dither effect, become the nucleus (8) in the metal continuous solidification process.
8. device according to claim 7 is characterized in that, this device also comprises:
Cold burden decoiling equipment (1) is with cold burden (2) uncoiling of composition in claimed range;
Cold burden straightener (3) is with the cold burden after the uncoiling (2) aligning, simultaneously in the molten metal (9) that continuously feeding is cast or continuous casting is preceding.
9. device according to claim 7 is characterized in that, described vibration generation source (5) can be at least a in motor-driven, hydraulic-driven, the compressed gas-driven.
10. device according to claim 7 is characterized in that, in the crystallizer (6) of described cold burden (2) by vibrating mechanism (4) input continuous casting.
11. device according to claim 7 is characterized in that, described cold burden (2) can be for bar-shaped, and it is of a size of φ 10～φ 50mm; Also can be the arrowband, it be of a size of thick 2～35mm, wide 30～350mm.
12. device according to claim 7 is characterized in that, described cold burden (2) composition can be identical with the casting metal composition or close.
13. device according to claim 8 is characterized in that, described cold burden feeds crystallizer behind decoiling equipment, straightener, and cold burden can immerse the one or both sides feeding at the mouth of a river (10).
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102430729A (en) * | 2011-11-15 | 2012-05-02 | 内蒙古包钢钢联股份有限公司 | Method for preparing thinned steel continuous casting round billet crystal grains |
| CN104722729B (en) * | 2013-12-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of continuous-cast blank internal soundness ameliorative way |
| CN105983670B (en) * | 2015-01-28 | 2018-08-10 | 宝山钢铁股份有限公司 | A kind of compound method for intervening improvement Inner Quality of Billet |
| CN106141126A (en) * | 2015-03-25 | 2016-11-23 | 宝山钢铁股份有限公司 | Improve the device and method of continuous casting billet solidified structure |
| CN106111927A (en) * | 2016-07-28 | 2016-11-16 | 湖南科美达电气股份有限公司 | The grain refining of a kind of continuous casting billet solidified structure and the method that homogenizes |
| CN112122567B (en) * | 2020-09-07 | 2021-07-09 | 东北大学 | Method for improving solidification quality of casting blank by feeding stainless steel ladle core wire into crystallizer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003211259A (en) * | 2002-01-17 | 2003-07-29 | Sanyo Special Steel Co Ltd | Method for continuously casting steel |
| JP2004298933A (en) * | 2003-03-31 | 2004-10-28 | Nikko Metal Manufacturing Co Ltd | Semi-continuous casting mold oscillation for copper alloy |
| CN1624161A (en) * | 2004-12-19 | 2005-06-08 | 赵正清 | Process and equipment for feeding wire |
| JP2005230847A (en) * | 2004-02-18 | 2005-09-02 | Nippon Steel Corp | Method for continuously casting molten metal |
| CN1686637A (en) * | 2005-03-28 | 2005-10-26 | 姜虹 | Mould vibration device |
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2005
- 2005-12-16 CN CNB2005101342948A patent/CN1332773C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003211259A (en) * | 2002-01-17 | 2003-07-29 | Sanyo Special Steel Co Ltd | Method for continuously casting steel |
| JP2004298933A (en) * | 2003-03-31 | 2004-10-28 | Nikko Metal Manufacturing Co Ltd | Semi-continuous casting mold oscillation for copper alloy |
| JP2005230847A (en) * | 2004-02-18 | 2005-09-02 | Nippon Steel Corp | Method for continuously casting molten metal |
| CN1624161A (en) * | 2004-12-19 | 2005-06-08 | 赵正清 | Process and equipment for feeding wire |
| CN1686637A (en) * | 2005-03-28 | 2005-10-26 | 姜虹 | Mould vibration device |
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Assignee: Of continuous casting technology in the National Engineering Research Center Co., Ltd. Assignor: Central Iron & Steel Research Institute Contract fulfillment period: 2007.12.15 to 2013.12.15 Contract record no.: 2008990000622 Denomination of invention: Improved method of vibration exciting metal liquid shape crystal nucleus and its device Granted publication date: 20070822 License type: Exclusive license Record date: 2008.10.8 |
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