CN1256203C - Method for improving continuous casting blank quality and vibration support roller device - Google Patents
Method for improving continuous casting blank quality and vibration support roller device Download PDFInfo
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- CN1256203C CN1256203C CN 200410069058 CN200410069058A CN1256203C CN 1256203 C CN1256203 C CN 1256203C CN 200410069058 CN200410069058 CN 200410069058 CN 200410069058 A CN200410069058 A CN 200410069058A CN 1256203 C CN1256203 C CN 1256203C
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- support roller
- vibration support
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Abstract
The present invention belongs to the field of the continuous cast of metal, particularly to a method for improving continuous casting blank quality and a vibration support roller device. The method comprises the steps that when a vibration support roller which is tightly attached to the outer wall of a continuous casting blank shell keeps synchronous rotation with the surface of a continuous casting blank, the vibration support roller is vibrated perpendicular to the thickness direction of the casting blank or parallel to the blank pulling direction under the drive of a vibration source, and the vibration is transmitted to a solidified shell which is provided with a liquid core by contact. The vibration support roller device used by the method is composed of the vibration support roller which is tightly attached to the outer wall of the continuous casting blank, a vibration transmission pipeline which is connected with the vibration support roller, and a vibration generation source. Compared with the present invention, the present invention has the advantages that the structure is simple, the easy controlled vibration support roller device is used for enhancing the center equiaxed grain rate of the continuous casting blank so as to achieve the aims for obviously improving the center shrinking holes and porosity of the continuous casting blank and reducing segregation, the present invention effectively prevents rolling cracks caused by light press by the tail end, and accordingly, the quality of continuous casting blanks is improved.
Description
Technical field
The invention belongs to the continuous casting of metal field, particularly improve the method and the vibration support roller device of continuous casting billet quality.
Background technology
In the continuous casting production technology of existing steel, because choosing divides the continuous casting billet center mass that crystallization caused to reduce, especially problems such as high-alloy steel, center segregation that the high-carbon steel continuous casting base produced, central pipe, center porosity are the key problems 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 mainly are divided into two classes: the one, electromagnetic agitating technology; The 2nd, solidification end is gently depressed or rolling casting technology.Chinese patent patent No. ZL99250649.2 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.
For defectives such as the segregation that effectively improves the strand center, loose and shrinkage cavities, method and device that Chinese patent patent No. CN1393308A provides a kind of continuous casting gently to depress, the pressure roller that is characterized in gently depressing with the enforcement more than 2 is at little drafts of casting blank solidification end enforcement, to eliminate the center porosity and the segregation of process of setting formation in latter stage.Reach the purpose that improves continuous casting billet quality.There are two problems in this technology in implementation process: the one, need increase huge light screwdown gear at the continuous casting billet solidification end; The 2nd, it is little that little light drafts solidifies the center porosity and the segregation effect that form latter stage to elimination, and bigger light drafts can cause the generation of casting blank solidification forward position crackle to the stronger steel grade of some crack sensitivities, wayward.
Summary of the invention
The object of the present invention is to provide by simple in structure, manageable vibration support roller device improve continuous casting billet center equiaxial crystal ratio with reach obvious improve the continuous casting billet central pipe and loose, reduce segregation and effectively avoided solidification end gently to depress the rolling crack that is caused and produce, thereby improve the method for continuous casting billet quality.
According to above-mentioned purpose, concrete solution of the present invention is: the vibration support roller of this method by being close to the continuous casting billet outer wall is when keeping rotating synchronously with continuous casting billet solidified shell surface, under the driving in vibrations generation source, do perpendicular to the slab thickness direction or be parallel to the vibrations of throwing direction, and by contacting the solidified shell that this vibrations is transferred to band liquid core, wherein the amplitude of vibration support roller is 0.01-1.0mm, shakes to be the 10-1000 hertz frequently.
The used vibration support roller device of said method is made up of the vibration support roller that is close to the continuous casting billet outer wall, coupled vibrations transfer line and vibrations generation source.
According to the steel grade characteristic difference of institute's continuous casting, vibration support roller directly is placed on the middle part of crystallizer end, Secondary Cooling Zone of Continuous Caster or is placed on any one position in the end that solidifies near continuous casting billet.Also can be placed on any two positions or placement simultaneously in above-mentioned three positions.
Otherwise address scheme of the present invention is: place 2 groups of vibration support rollers at the strand outer wall in the billet continuous casting process.Or in the sheet billet continuous casting process, can place 1 group or 2 groups of vibration support rollers at the strand outer wall.
Directly utilize original sufficient roller or fan-shaped section backing roll replacement vibration support roller in the casting machine backing roll row.Be about to vibrations and directly be transferred to original one or more groups backing roll of casting machine.
Adopt vibrations supportive grid plate to replace vibration support roller.
Adopt vibration support roller and magnetic stirrer to unite use, to strengthen the dendrite fragmentation ability.
Different and use location is different according to the steel grade characteristic of institute's continuous casting, and the amplitude of vibration support roller is 0.01-1.0mm, and shaking is the 10-1000 hertz frequently.Because this device is in use, can be according to the difference of steel grade characteristic and the difference of shell thickness (being the diverse location of conticaster), the different parameters of use.As at the crystallizer end, because the nascent solidified shell of strand is thin and temperature is very high, therefore solidified shell can not be born higher external force, can select little amplitude, the parameter frequently of shaking for a short time in the selection of vibration parameters for use, and amplitude can be selected 0.01-0.5mm for use, shake and frequently can select the 10-200 hertz for use.When this device is placed on two cold-zones of conticaster or solidification end, because shell thickness increases, the ability of solidified shell opposing external force strengthens, add that vibrations need penetrate the energy increase of solidified shell, therefore, can select large amplitude, good frequency parameter in the selection of vibration parameters for use, amplitude can be selected 0.1-1.0mm for use, shake and frequently can select the 30-1000 hertz for use.In addition, owing to dendrite growth fraction in high-carbon steel, the high-alloy steel process of setting is flourishing, therefore can select shake for a short time frequency, large amplitude for use; And mild steel, low-alloy steel since in the process of setting dendrite growth fraction more undeveloped, therefore can select good frequency, little amplitude for use.
In addition, vibration support roller device is applicable to the continuous casting of non-ferrous metal.
The present invention compared with prior art has by simple in structure, manageable vibration support roller device and the rolling crack effectively having avoided solidification end gently to depress being caused produces, thereby improves the advantage of continuous casting billet quality.The different equiaxial crystal ratios of invar kind improve 50-80% (from metallographic structure figure as can be seen).The dendrite that is specially the growth of solidified shell solidification front will be fractureed under the effect of vibrations and fragmentation, this has not only effectively suppressed the growth of solidified shell in the dendrite mode, and the dendrite that is fractureed with fragmentation also will become the core that continuous casting billet center equiax crystal is grown.Reach the purpose that improves continuous casting billet center equiaxial crystal ratio, reduces the strand segregation with this.When vibration support roller device was placed on terminal and two cold-zones of crystallizer, its dependence core that improves the equiax crystal forming core with broken dendrite that fractures improved equiaxial crystal ratio.And when vibration support roller device is placed on solidification end, it not only can play the effect that fractures with broken dendrite, because vibrations are forced to flow the liquid phase of not solidifying fully, therefore end are solidified formed shrinkage cavity and will play effective filling effect simultaneously with loose.Comparatively speaking, the employing of vibration support roller device can overcome the generation of the process of setting negative segregation that the electromagnetic agitation improper use caused, to reach the purpose that improves equiaxial crystal ratio; Can improve simultaneously strand central pipe and loose, and the generation of effectively having avoided solidification end gently to depress the rolling crack that is caused.
Description of drawings
Accompanying drawing 1 is the structural representation of vibration support roller device of the present invention.
Accompanying drawing 2 is that the present invention shakes the generalized section broken and dendrite that fractures.
Accompanying drawing 3 is generalized sections that backing roll of the present invention is placed on the crystallizer end.
Accompanying drawing 4 is generalized sections that vibration support roller is placed on middle part, two cold-zones.
Accompanying drawing 5 is generalized sections that vibration support roller of the present invention is placed on solidification end.
Accompanying drawing 6 is that 2 groups of vibration support rollers of the present invention are placed on the generalized section of the terminal and solidification end of crystallizer when being used in combination.
Generalized section when accompanying drawing 7 is the present invention's foot roller or fan-shaped section backing roll replacement vibration support roller.
Accompanying drawing 8 is the present invention's generalized sections when shaking flase floor replacement vibration support roller.
Accompanying drawing 9 is vibration support roller of the present invention and magnetic stirrer generalized sections when being used in combination.
In the above-mentioned accompanying drawing, the 1st, vibration support roller, the 2nd, vibrations transfer line, the 3rd, vibrations generation source, the 4th, casting blank solidification shell, the 5th, strand liquid core, the 6th, the dendrite of solidification front growth, the 7th, water mold, the 8th, sufficient roller, 9 is two cold fan-shaped supporting sections, the 10th, vibrations flase floor, the 11st, magnetic stirrer.
The specific embodiment
Among Fig. 1, vibration support roller device is by the vibration support roller 1 that is close to the continuous casting billet wall, and coupled vibrations transfer line 2 and vibrations generation source 3 compositions.
Among Fig. 2, vibration support roller 1 by being close to the continuous casting billet wall is when keeping rotating synchronously with continuous casting billet solidified shell 4 surfaces, under the driving in vibrations generation source 3, do perpendicular to the slab thickness direction or be parallel to the little amplitude vibrations of high frequency of throwing direction, and this vibrations are transferred to the solidified shell 4 of band liquid core 5 by contact.The dendrite 6 of solidified shell solidification front growth will be fractureed under the effect of this vibrations and be broken.The amplitude of vibration support roller 1 is 0.2mm, and shaking frequently is 50 hertz.The drive system in vibrations generation source 3 is pneumatic actuation.
Fig. 3 is that 1 group of backing roll 1 of the present invention is placed on the crystallizer end, and steel grade is No. 80 steel, and the amplitude of vibration support roller 1 is 0.2mm, and shaking frequently is 50 hertz.The drive system in vibrations generation source 3 is pneumatic actuation.
Fig. 4 is that 1 group of backing roll 1 of vibrations is placed in two cold-zones, and steel grade is 60Si
2Mn, the amplitude of vibration support roller 1 is 0.3mm, shaking frequently is 200 hertz.The drive system in vibrations generation source 3 is hydraulic-driven.
Fig. 5 is that 1 group of vibration support roller of the present invention places 1 at solidification end, and steel grade is GCr15, and the amplitude of vibration support roller 1 is 0.4mm, and shaking frequently is 100 hertz.The drive system in vibrations generation source 3 is motor-driven.
Fig. 6 is that 2 groups of vibration support rollers 1 of the present invention are placed on the crystallizer end and solidification end is used in combination, and steel grade is GCr15, and the amplitude of vibration support roller 1 is 0.2mm, and shaking frequently is 100 hertz.The moving drive system in vibrations generation source 3 is pneumatic actuation.
Among Fig. 7, directly utilize original sufficient roller 8 or fan-shaped section backing roll 9 replacement vibration support rollers 1 in the casting machine backing roll row.Be about to vibrations and directly be transferred to original one or more groups backing roll of casting machine.Steel grade is No. 45 steel, and the amplitude of vibration support roller 1 is 0.2mm, and shaking frequently is 100 hertz.The drive system in vibrations generation source 3 is hydraulic-driven.
Among Fig. 8, adopt 1 group of vibrations supportive grid plate 10 to replace 1 group of vibration support roller 1.Steel grade is 16Mn, and the amplitude of vibration support roller 1 is 0.2mm, and shaking frequently is 50 hertz.The drive system in vibrations generation source 3 is pneumatic actuation.
Among Fig. 9, adopt 1 group of vibration support roller 1 and 1 group of magnetic stirrer 11 to unite use to strengthen the dendrite fragmentation ability.Steel grade is 60Si
2Mn, the amplitude of vibration support roller 1 is 0.2mm, shaking frequently is 50 hertz.The drive system in vibrations generation source 3 is pneumatic actuation.
Claims (9)
1, a kind of method that improves continuous casting billet quality, it is characterized in that vibration support roller (1) by being close to the continuous casting billet outer wall is when keeping rotating synchronously with continuous casting billet solidified shell (4) surface, under the driving in vibrations generation sources (3), do perpendicular to the slab thickness direction or be parallel to the vibrations of throwing direction, and by contacting the solidified shell (4) that this vibrations is transferred to band liquid core (5), wherein the amplitude of vibration support roller (1) is 0.01-1.0mm, shakes to be the 10-1000 hertz frequently.
2, the used vibration support roller device of the method for raising continuous casting billet quality according to claim 1 is characterized in that it is made up of the vibration support roller that is close to the continuous casting billet outer wall (1), coupled vibrations transfer line (2) and vibrations generation sources (3).
3, vibration support roller device according to claim 2 is characterized in that vibration support roller (1) directly is placed on the middle part of end, Secondary Cooling Zone of Continuous Caster of crystallizer (7) or any one position in the end that solidifies near continuous casting billet.
4, vibration support roller device according to claim 3 is characterized in that vibration support roller (1) is placed on any two positions or placement simultaneously in above-mentioned three positions.
5,, it is characterized in that placing 1 group or 2 groups of vibration support rollers (1) at the strand outer wall according to claim 2,3 or 4 described vibration support roller devices.
6,, it is characterized in that vibration support roller (1) is sufficient roller (8) or fan-shaped section backing roll (9) according to claim 2,3 or 4 described vibration support roller devices.
7,, it is characterized in that shaking supportive grid plate (10) and replace vibration support roller (1) according to claim 2,3 or 4 vibration support roller devices of stating.
8,, it is characterized in that vibration support roller (1) and magnetic stirrer (11) unite use according to claim 2,3 or 4 described vibration support roller devices.
9, vibration support roller device according to claim 2 is characterized in that being applicable to the continuous casting of non-ferrous metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410069058 CN1256203C (en) | 2004-07-19 | 2004-07-19 | Method for improving continuous casting blank quality and vibration support roller device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410069058 CN1256203C (en) | 2004-07-19 | 2004-07-19 | Method for improving continuous casting blank quality and vibration support roller device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1586767A CN1586767A (en) | 2005-03-02 |
| CN1256203C true CN1256203C (en) | 2006-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410069058 Expired - Fee Related CN1256203C (en) | 2004-07-19 | 2004-07-19 | Method for improving continuous casting blank quality and vibration support roller device |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018055799A1 (en) * | 2016-09-21 | 2018-03-29 | Ｊｆｅスチール株式会社 | Continuous steel casting method |
| CN108526423A (en) * | 2018-03-29 | 2018-09-14 | 马鞍山钢铁股份有限公司 | A kind of method, control method and device of slab quality improving casting process solidification middle and later periods solid-liquid two-phase region mobility |
| CN110586886A (en) * | 2019-09-30 | 2019-12-20 | 中达连铸技术国家工程研究中心有限责任公司 | Rotary supporting roller with rotary vibrating piece |
| CN110548845A (en) * | 2019-09-30 | 2019-12-10 | 中达连铸技术国家工程研究中心有限责任公司 | Continuous casting rotary supporting roller with vibrating piece |
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