CN102423796B - Method for controlling cementation of casting roller on fan-shaped section of continuous casting machine - Google Patents
Method for controlling cementation of casting roller on fan-shaped section of continuous casting machine Download PDFInfo
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- CN102423796B CN102423796B CN 201110388210 CN201110388210A CN102423796B CN 102423796 B CN102423796 B CN 102423796B CN 201110388210 CN201110388210 CN 201110388210 CN 201110388210 A CN201110388210 A CN 201110388210A CN 102423796 B CN102423796 B CN 102423796B
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Abstract
The invention relates to a quality assurance technology for continuous casting machine equipment and a casting blank. Aggregates such as iron sheets falling from the surface of the blank, covering slag residues, secondary cooling water scales and the like are accumulated, and part of aggregates are remelted or sintered and cemented on the surface of a casting roller to form a hard cementing substance, so that the casting roller stops rotating. In order to eliminate influence on the normal operation of the equipment and solve the quality problem of the casting blank, the invention provides a method for reducing the cementing substance enriched on the surface of the roller, namely an aerial fog water spray device is arranged near an inner arc roller of a fan-shaped section in front of a bending section, a straightening section and a horizontal section of an arc continuous casting machine and sprays aerial fog cooling water onto the surface of the roller to form a water film, so that the temperature of the casting roller is reduced, and a lubricating effect is achieved between the continuous casting blank and the casting roller. The cleaning frequency of a segmental roller on the fan-shaped section can be effectively reduced, the segmental roller is overhauled once every 15 to 17 weeks instead of once every 8 to 10 weeks originally, and the operation service life of the fan-shaped section is effectively improved; and compared with an off-line overhaul mode, the overhaul mode has the advantages that: maintenance cost is reduced by over 30 percent, and the operation rate of the casting machine is improved by over 2 percent.
Description
Technical field
The present invention relates to sheet billet continuous casting machine equipment and slab quality safeguards technique in the steel products production process, particularly relate to the method that reduces the surperficial bonding of Continuous Casting Rolls incidence.
Background technology
In the sheet billet continuous casting production process, generally support and the straightening strand by sectorial sectional rollers.Because conticaster mostly is arcuate structure; in process of production; after the iron scale that comes off due to casting billet surface, covering slag residue, secondary cooling water evaporation, the aggregation such as residual incrustation scale is deposited in " the angle district " of fan-shaped section inner arc roller and continuous casting billet formation, as shown in Figure 1.Part aggregation is washed away by secondary cooling water, the aggregation that another part is not washed away by secondary cooling water Continuous Casting Rolls roll and the high temperature action of continuous casting billet under remelting or sintering occur, thereby be bonded in the Continuous Casting Rolls surface, form in the course of time hard adhesive.The adhesive of roller surfaces can cause frictional force increase between casting roll and strand, thereby increases resistance of billet withdrawal, damages the fan-shaped section drive system; Simultaneously harder adhesive is attached to the driven voller surface, can cause driven voller to stop operating, thereby form cut at casting billet surface, causes the continuous casting billet blemish.
At present existing metallargist is studied for this problem, " investigation and analysis of conticaster foot roller (also claiming the fan-shaped section casting roll) adhesive " delivered in Baogang's science and technology as people such as Shen Junfeng, sufficient roller attachment has been carried out detecting analyzed, point out the quality harm of casting roll attachment to continuous casting billet, but do not provided a kind of effective ways that reduce adhesive.There is research to point out, reduces roll temperature and can effectively reduce the roll banding incidence.The continuous casting machine fan-shaped segment casting roll is hollow water-cooling structure at present, thereby reaches cooling roll body, reduces the purpose of the incidence of adhesive remelting or sintering.But due to the hot properties of casting process itself, only rely on the method not stop fully and significantly effectively reduce the generation of roll banding.In fact, each steel mill carries out the off-line reconditioning except regularly changing fan-shaped section at present, and other is not specially for this way to solve the problem.
Analyze according to a large amount of field trials and detection, when the fan-shaped section casting roller surface was coated with obvious moisture film, can effectively reduce the generation of bonding this moment.The moisture film of casting roller surface has reduced the casting roll temperature on the one hand, and the opposing party's moisture film plays " lubricating " effect, can effectively reduce enrichment and the remelting of adhesive.According to this principle, patent of the present invention has proposed a kind of passing through in casting roll and strand contact position covering moisture film, the method for cohering to reduce casting roller surface.
Summary of the invention
The present invention overcomes continuous casting machine fan-shaped segment casting roller surface enrichment aggregation to form hard adhesive, and the normal operation of the equipment that has a strong impact on and slab quality problem provide a kind of method that reduces continuous casting segment roller surface enrichment adhesive in continuous casting is produced.
The technical solution adopted for the present invention to solve the technical problems is: the water injector that one group of special angle is installed on continuous casting segment roller surface, it is to continuous casting segment roller jet surface cooling water, thereby make its surface coverage one deck " moisture film ", even the high temperature casting roll is by water-wet.Moisture film has reduced the casting roll temperature on the one hand, forms lubrication on the other hand between continuous casting billet and casting roll,
The present invention mainly realizes by following method.The aerosol water injector is installed near the inner arc roller of the fan-shaped section before circular-arc type continuous casting machine bending section, straightening section and horizontal segment, to its roller jet surface aerosol cooling water, is played preventing that adhesive is enriched in the effect on Continuous Casting Rolls.
In said method, described nozzle is furnished with three nozzles (4) between every two rollers, and wherein intermediate noxzzle is the secondary cooling jet, and it is flat burner, and its spray regime covers whole strand at width; Two nozzles of limit section are that the angle of inclination nozzle ejection is to Continuous Casting Rolls.Described nozzle setting height(from bottom) perpendicular to wide direction of strand, is arranged in the scope than the little 30-60mm of casting roll diameter; Nozzle is installed width range, is arranged in the scope of strand edge 20-30mm.The spray angle of described nozzle, the flat burner spray angle is chosen 15 °-30 ° at the jet angle α perpendicular to the casting roll direction; The angle of inclination nozzle spray angle is chosen 60 °-110 ° at the jet angle β that is parallel to the casting roll direction.The expulsion pressure of described nozzle, for compressed air air pressure greater than 0.2Mpa, discharge 0.1-0.5l/min.
Before stating method in the use, need to carry out correcting process to former secondary cooling water amount, it is characterized in that former secondary cooling water amount is adopted w '
i=w
i-a (n
iW
s) carry out correcting process; In formula, w '
iBe revised i district secondary cooling water; w
iBe the i district cooling water inflow before revising, generally it is provided by the secondary cooling control system; A is corrected parameter, span 1.0-2.0; n
iThe nozzle number in i district; w
sThe current mean value of single-nozzle.
This method is applicable to main body frame and adopts many group solid matter metamerism rollers to support the conticaster of continuous casting billet, is specially adapted to generous slab casting process.Adopt technology of the present invention, can significantly reduce enrichment and the bonding of casting roller surface adhesive, thereby reduce sectorial sectional rollers cleaning frequency, extended the fan-shaped section time between overhauls(TBO), from original 8-10 weekly repair once, be extended for the 15-17 weekly repair once, effectively improved the fan-shaped section operation life-span.Compare with the off-line maintenance mode, reduce maintenance cost and reach more than 30%, improve caster work rate more than 2%.
Description of drawings
Fig. 1 is casting roll adhesive enrichment schematic diagram.Fig. 2 is the nozzle scheme of installation that the present invention designs.
The vertical strand of Fig. 3 nozzle and casting roll direction installation site.The vertical casting roll direction of Fig. 4 nozzle installation site.
In the drawings, (1) fan-shaped section casting roll, (2) strand, (3) enrichment, (4) nozzle, the α angle is that nozzle is perpendicular to the spray angle of roller direction, the β angle is the jet angle that nozzle is parallel to the roller direction, (5) Continuous Casting Rolls cooled region, (6) liquid core of continuous casting billet.
The specific embodiment
As shown in Figure 2, be furnished with three nozzles (4) between every two rollers, wherein intermediate noxzzle is the secondary cooling jet, it is flat burner, its spray regime can cover whole strand at width, by spraying the aerosol cooling water to strand, plays the effect of cooling strand.The cooling employing of two, limit section angle of inclination nozzle ejection aerosol, as shown in Figure 3.Cooling water plays preventing that adhesive is enriched in the effect on Continuous Casting Rolls to Continuous Casting Rolls.
(1) installation site of nozzle:
The present invention is applicable to main body frame and adopts many group solid matter metamerism rollers to support the conticaster of continuous casting billet, is specially adapted to the sheet billet continuous casting process.Mainly occur in inner arc because roller coheres phenomenon, be prone to especially the first half zone at bending section, straightening section and horizontal segment.Therefore, the nozzle installation site is the inner arc of 2-4 fan-shaped section before circular-arc type continuous casting machine bending section, straightening section and horizontal segment.
As shown in Figure 4, top is metamerism roller, and the bottom is continuous casting billet.According to continuous casting billet coagulating property from outside to inside, strand central area base shell is thinner, and it is subjected to easily to deform after the casting roll chucking power, and corner section base shell is thicker, is difficult for producing distortion.Therefore, the Continuous Casting Rolls chucking power mainly is applied to the left and right sides on continuous casting billet surface, easily produces adhesive in Continuous Casting Rolls limit section and assembles.Only to carry out roller cooling in commute zone that bonding occurs in the present invention, guaranteed the stability of original two cold techniques when effectively reducing the adhesive enrichment.General nozzle is respectively installed one in casting roll both sides in the scope of strand edge 20-30mm.
In short transverse, nozzle will play the effect of wetting casting roll, so its setting height(from bottom) (perpendicular to wide direction of strand) should be lower than the casting roll diameter, and general value is than the little 30-60mm of casting roll diameter.
(2) Nozzle Parameter:
Choose platypelloid type aerosol cooling jet in the present invention, nozzle is generally chosen 15 ° of-30 ° of α angles as shown in Figure 3 perpendicular to the spray angle of roller direction, and the jet angle that is parallel to the roller direction is chosen 60 °-110 °, β angle as shown in Figure 4.
(3) ratio of aerosol cooling water and flow selection principle:
General in casting process to adopt the aerosol type of cooling to carry out secondary cooling, and namely mixing water and compressed air by a certain percentage, spray to casting billet surface, reaches cooling effect.Cooling different from the continuous casting secondary, the aerosol cooling water of the nozzle ejection in the present invention sprays to casting roll, mainly plays the effect of " wetting " casting roll.Adopt mixed water valve with gas and water mixing in the present invention, spray to the roller surface with air pressure drive current.Cooling object of the present invention is casting roll, so the air pressure of diverse location and discharge is fixed value, and wherein compressed air air pressure is generally greater than 0.2Mpa, nozzle cooling water water gaging flow 0.1-0.5l/min.
(4) adjustment of secondary cooling water:
Can flow to casting billet surface, particularly jeting area and concentrate on strand corner section owing to acting on the water yield on casting roll, cause that easily the continuous casting billet bight is excessively cold, thereby cause the chink line, therefore need carry out certain correcting process to former secondary cooling water amount.The computational methods of revising the water yield are shown below.
w′
i＝w
i-a·(n
i·w
s)
In formula, w '
iBe revised i district secondary cooling water; w
iBe the i district cooling water inflow before revising, generally it is provided by the secondary cooling control system; A is corrected parameter, span 1.0-2.0; n
iThe nozzle number in i district; w
sThe current mean value of single-nozzle.
Embodiment
The continuous casting machine parameter: the arc billet continuous casting machine, producing the Cross Section of CC Billet width specifications is 1600mm, 1800mm, 2100mm, the thickness direction specification is 180mm, 200mm, 250mm.Streamline length 35.5m, Continuous Casting Rolls radius 230mm (segmental arc) and 300mm (straightening section and horizontal segment) divide 8 of two cold-zones altogether.
Design parameter in the invention process is: nozzle spray angle is wide to 60 ° of spray angles, and the nozzle installation site is apart from slab edge 25mm, apart from steel slab surface vertical range 180mm (segmental arc) and 250mm (straightening section and horizontal segment).Near each inner arc roller of conticaster 5-8 fan-shaped section, aerial fog nozzle is installed all.The average cooling water inflow of each nozzle is 0.15l/min.
Before the present invention used, conticaster 5-8 section had the phenomenon of roller surface bonding aggregation in various degree, wherein especially with the 7th section and the 8th section comparatively serious.The fan-shaped section that causes due to adhesive enrichment reason time between overhauls(TBO) of rolling off the production line is about 3 months, the situation that the 7th section and the 8th section life cycle less than of reaching the standard grade just were replaced lower cleaning in 2 months even occurs.After adopting the present invention, effectively suppressed the phenomenon of roller surface adhesive gathering, fan-shaped section does not need the maintenance of rolling off the production line because of the adhesive enrichment, has guaranteed the equalization stable of continuous casting billet resistance of billet withdrawal, has ensured the stability of producing, and has effectively improved the conticaster operating rate.
Claims (5)
1. the control method of cementation of casting roller on fan-shaped section of continuous casting machine, it is characterized in that the aerosol water injector being installed near the inner arc roller of the fan-shaped section before circular-arc type continuous casting machine bending section, straightening section and horizontal segment is nozzle, to its roller jet surface aerosol cooling water, play preventing that adhesive is enriched in the effect on Continuous Casting Rolls; And former secondary cooling water amount is adopted w
i'=w
i-a (n
iW
s) carry out correcting process; In formula, w
i' be revised i district secondary cooling water; w
iBe the i district cooling water inflow before revising, generally it is provided by the secondary cooling control system; A is corrected parameter, span 1.0-2.0; n
iThe nozzle number in i district; w
sThe current mean value of single-nozzle.
2. the method for claim 1, is characterized in that described nozzle is furnished with three nozzles (4) between every two rollers, and wherein intermediate noxzzle is the secondary cooling jet, and it is flat burner, and its spray regime covers whole strand at width; Two nozzles of limit section are that the angle of inclination nozzle ejection is to Continuous Casting Rolls.
3. method as claimed in claim 1 or 2, is characterized in that described nozzle setting height(from bottom), perpendicular to wide direction of strand, is arranged in the scope than the little 30-60mm of casting roll diameter; Nozzle is installed width range, is arranged in the scope of strand edge 20-30mm.
4. method as claimed in claim 2 is characterized in that the spray angle of described nozzle, and the flat burner spray angle is chosen 15 °-30 ° at the jet angle α perpendicular to the casting roll direction; The angle of inclination nozzle spray angle is chosen 60 °-110 ° at the jet angle β that is parallel to the casting roll direction.
5. method as claimed in claim 1 or 2 is characterized in that the expulsion pressure of described nozzle, for compressed air air pressure greater than 0.2Mpa, discharge 0.1-0.5l/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110388210 CN102423796B (en) | 2011-11-29 | 2011-11-29 | Method for controlling cementation of casting roller on fan-shaped section of continuous casting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110388210 CN102423796B (en) | 2011-11-29 | 2011-11-29 | Method for controlling cementation of casting roller on fan-shaped section of continuous casting machine |
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| CN102423796A CN102423796A (en) | 2012-04-25 |
| CN102423796B true CN102423796B (en) | 2013-11-06 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699297A (en) * | 2012-06-29 | 2012-10-03 | 秦皇岛首秦金属材料有限公司 | Method for solving transverse cracks of ultra-thick plate billet corner by applying 3D (three-dimensional) spraying process |
| CN103464708B (en) * | 2013-09-06 | 2015-08-26 | 上海宝锋工程技术有限公司 | A kind of cooling twice arrangement of nozzles method that blank plates of silicon steels continuous casting is produced |
| CN112756576B (en) * | 2020-12-03 | 2022-03-04 | 广西柳钢华创科技研发有限公司 | Treatment method for generating scratches on surface of continuous casting slab to wide-surface foot roll or bent section of crystallizer |
| CN114632919B (en) * | 2020-12-03 | 2023-06-16 | 广西柳州钢铁集团有限公司 | Method for treating scratches on surface of continuous casting slab |
| CN112692247B (en) * | 2020-12-03 | 2022-03-11 | 广西柳钢华创科技研发有限公司 | Treatment method for generating scratches on surface of continuous casting slab in arc-shaped section |
| CN112756575B (en) * | 2020-12-03 | 2022-02-18 | 广西柳钢华创科技研发有限公司 | Processing method for generating scratches on surface of continuous casting slab in horizontal section |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3766968A (en) * | 1971-04-30 | 1973-10-23 | Voest Ag | Continuous casting plant for slabs |
| CN2082208U (en) * | 1990-04-26 | 1991-08-07 | 营口市连铸机械配件厂 | Water spray device of square billet conticaster for cast-billet guiding |
| CN101985163A (en) * | 2010-11-23 | 2011-03-16 | 中冶南方工程技术有限公司 | Spray pipe device for billet caster |
| CN202006272U (en) * | 2011-03-04 | 2011-10-12 | 上海梅山钢铁股份有限公司 | Horizontal segment cooling device of continuous casting machine |
-
2011
- 2011-11-29 CN CN 201110388210 patent/CN102423796B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3766968A (en) * | 1971-04-30 | 1973-10-23 | Voest Ag | Continuous casting plant for slabs |
| CN2082208U (en) * | 1990-04-26 | 1991-08-07 | 营口市连铸机械配件厂 | Water spray device of square billet conticaster for cast-billet guiding |
| CN101985163A (en) * | 2010-11-23 | 2011-03-16 | 中冶南方工程技术有限公司 | Spray pipe device for billet caster |
| CN202006272U (en) * | 2011-03-04 | 2011-10-12 | 上海梅山钢铁股份有限公司 | Horizontal segment cooling device of continuous casting machine |
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| CN102423796A (en) | 2012-04-25 |
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