CN102423796A - 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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- CN102423796A CN102423796A CN2011103882109A CN201110388210A CN102423796A CN 102423796 A CN102423796 A CN 102423796A CN 2011103882109 A CN2011103882109 A CN 2011103882109A CN 201110388210 A CN201110388210 A CN 201110388210A CN 102423796 A CN102423796 A CN 102423796A
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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 continuous casting roller surface bonding incidence.
Background technology
In the sheet billet continuous casting production process, generally lean on the fan-shaped section metamerism roller to support and the straightening strand.Because mostly conticaster is arcuate structure; In process of production; Because aggregations such as the iron scale that casting billet surface comes off, covering slag residue, the residual incrustation scale in secondary cooling water evaporation back are deposited in " the angle district " of fan-shaped section inner arc roller and continuous casting billet formation, and are 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 the continuous casting roller roll and remelting or sintering take place down in the high temperature action of continuous casting billet, thereby it is surperficial to be bonded in the continuous casting roller, forms hard adhesive in the course of time.The adhesive of roller surfaces can cause frictional force increase between casting roller and the strand, thereby increases resistance of billet withdrawal, damages the fan-shaped section drive system; Simultaneously harder adhesive can cause driven voller to stop operating attached to the driven voller surface, thereby forms cut at casting billet surface, causes the continuous casting billet blemish.
At present existing metallargist studies to this problem; " investigation and analysis of conticaster foot roller (also claiming fan-shaped section casting roller) adhesive " delivered in Baogang's science and technology like people such as Shen Junfeng; Sufficient roller attachment check and analysis have been carried out; Pointed out of the quality harm of casting roller attachment, but do not provided a kind of effective ways that reduce adhesive continuous casting billet.There is research to point out, reduces roll temperature and can effectively reduce the roll banding incidence.The roller of continuous casting machine fan-shaped segment casting at present is hollow water-cooling structure, thereby reaches the cooling roll body, reduces the purpose of the incidence of adhesive remelting or sintering.But because the hot properties of casting process itself only relies on this method can not stop fully and the generation that effectively reduces roll banding significantly.In fact, each steel mill carries out the off-line reconditioning except that regularly changing fan-shaped section at present, and other is not specially to this way to solve the problem.
According to a large amount of field trials and check and analysis, when the fan-shaped section casting roller surface was coated with tangible 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 the enrichment and the remelting of adhesive.According to this principle, patent of the present invention has proposed a kind of through covering moisture film at casting roller and strand contact position, to reduce the method that casting roller surface coheres.
Summary of the invention
The present invention overcomes continuous casting machine fan-shaped segment casting roller surface enrichment aggregation to form hard adhesive, and normal operation of the equipment that has a strong impact on and slab quality problem provide a kind of method that in continuous casting is produced, reduces continuous casting fan-shaped section roller surface enrichment adhesive.
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 fan-shaped section roller surface; It is to continuous casting fan-shaped section roller jet surface cooling water; Thereby make its surface coverage one deck " moisture film ", even high temperature casting roller is by water-wet.Moisture film has reduced the casting roll temperature on the one hand, between continuous casting billet and casting roller, forms lubrication on the other hand,
The present invention mainly leans on following method to realize.Near the inner arc roller of the fan-shaped section before circular-arc type continuous casting machine bending section, aligning section and horizontal segment the aerosol water injector is installed,, is played preventing that adhesive is enriched in the effect on the continuous casting roller to its roller jet surface aerosol cooling water.
In said method, described nozzle is furnished with three nozzles (4) between per two rollers, and wherein intermediate noxzzle is the secondary cooling jet, and it is a flat burner, and its spray regime covers whole strand at width; Two nozzles of limit portion are on angle of inclination nozzle ejection to the continuous casting roller.Described nozzle setting height(from bottom) perpendicular to wide direction of strand, is installed in the scope than the little 30-60mm of casting roller diameter; Nozzle is installed width range, is installed 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 casting roller direction; The angle of inclination nozzle spray angle is chosen 60 °-110 ° at the jet angle β that is parallel to casting roller direction.The expulsion pressure of said nozzle, for compressed air air pressure greater than 0.2Mpa, discharge 0.1-0.5l/min.
Before stating method in the use, need carry out correcting process, it is characterized in that former secondary cooling water amount is adopted w ' former secondary cooling water amount
i=w
i-a (n
iW
s) carry out correcting process; In the 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 a 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 that main body frame 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 the enrichment and the bonding of casting roller surface adhesive, thereby reduce fan-shaped section metamerism roller cleaning frequency; Prolonged 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 a casting roller adhesive enrichment sketch map.Fig. 2 is a designed nozzle scheme of installation of the present invention.
Vertical strand of Fig. 3 nozzle and casting roller direction installation site.Fig. 4 nozzle is vertically cast roller direction installation site.
In the drawings, (1) fan-shaped section casting roller, (2) strand, (3) enrichment, (4) nozzle, the α angle is the spray angle of nozzle perpendicular to the roller direction, the β angle is the jet angle that nozzle is parallel to the roller direction, (5) continuous casting roller cooled region, (6) liquid core of continuous casting billet.
The specific embodiment
As shown in Figure 2, between per two rollers, be furnished with three nozzles (4), wherein intermediate noxzzle is the secondary cooling jet; It is a flat burner; Its spray regime can cover whole strand at width, through spraying the aerosol cooling water to strand, plays the effect of cooling strand.Angle of inclination nozzle ejection aerosol is adopted in two coolings of limit portion, and is as shown in Figure 3.On cooling water to the continuous casting roller, play preventing that adhesive is enriched in the effect on the continuous casting roller.
(1) installation site of nozzle:
The present invention is applicable to that main body frame 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.Because roller coheres phenomenon and mainly occurs in inner arc, be prone to preceding half zone especially at bending section, aligning 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, aligning section and the horizontal segment.
As shown in Figure 4, top is metamerism roller, and the bottom is a continuous casting billet.According to continuous casting billet coagulating property from outside to inside, strand central area base shell is thinner, and it is prone to deform after being cast the roller chucking power, and corners base shell is thicker, is difficult for producing distortion.Therefore, continuous casting roller chucking power mainly is applied to the left and right sides on continuous casting billet surface, and portion is prone to produce the adhesive gathering on continuous casting roller limit.The present invention only zone of commute generation bonding carries out the roller cooling, when effectively reducing the adhesive enrichment, has guaranteed the stability of original two cold technologies.General nozzle is respectively installed one in casting roller both sides in the scope of strand edge 20-30mm.
In short transverse, nozzle will play the effect of wetting casting roller, so its setting height(from bottom) (perpendicular to wide direction of strand) should be lower than the casting roller diameter, the little 30-60mm of general value ratio casting roller diameter.
(2) nozzle parameter:
Choose platypelloid type aerosol cooling jet among 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:
The general aerosol type of cooling that adopts is carried out the secondary cooling in the casting process, and promptly mixing water and compressed air by a certain percentage spray to casting billet surface, reach cooling effect.Different with the cooling of continuous casting secondary, the aerosol cooling water of the nozzle ejection among the present invention sprays to the casting roller, mainly plays the effect of " wetting " casting roller.Adopt among the present invention and mix water valve, drive current with air pressure and spray to the roller surface gas and water mixing.Cooling object of the present invention is the casting roller, 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 the strand corners owing to act on the water yield of casting on the roller, be prone to cause that the continuous casting billet bight is cold excessively, thereby cause the chink line, therefore need carry out certain correcting process 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 the 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 a corrected parameter, span 1.0-2.0; n
iThe nozzle number in i district; w
sThe current mean value of single-nozzle.
Embodiment
The conticaster device parameter: the arc billet continuous casting machine, producing continuous casting billet section width specification is 1600mm, 1800mm, 2100mm, the thickness direction specification is 180mm, 200mm, 250mm.Streamline length 35.5m, continuous casting roller radius 230mm (segmental arc) and 300mm (aligning section and horizontal segment) divide 8 of two cold-zones altogether.
Concrete parameter during the present invention implements 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 (aligning 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, and is wherein comparatively serious with the 7th section and the 8th section especially.The fan-shaped section that causes owing to adhesive enrichment reason time between overhauls(TBO) of rolling off the production line is about 3 months, even the situation that the 7th section and the 8th section life cycle less than of reaching the standard grade just was replaced down cleaning in 2 months occurs.After adopting the present invention, effectively suppressed the phenomenon that roller surface adhesive is assembled, 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 (6)
1. continuous casting machine fan-shaped segment is cast the control method of roller bonding; It is characterized in that near the inner arc roller of the fan-shaped section before circular-arc type continuous casting machine bending section, aligning section and horizontal segment the aerosol water injector being installed; To its roller jet surface aerosol cooling water, play preventing that adhesive is enriched in the effect on the continuous casting roller.
2. the method for claim 1 is characterized in that described nozzle is furnished with three nozzles (4) between per two rollers, and wherein intermediate noxzzle is the secondary cooling jet, and it is a flat burner, and its spray regime covers whole strand at width; Two nozzles of limit portion are on angle of inclination nozzle ejection to the continuous casting roller.
3. according to claim 1 or claim 2 method is characterized in that described nozzle setting height(from bottom), perpendicular to wide direction of strand, is installed in the scope than the little 30-60mm of casting roller diameter; Nozzle is installed width range, is installed in the scope of strand edge 20-30mm.
4. according to claim 1 or claim 2 method is characterized in that the spray angle of described nozzle, and the flat burner spray angle is being chosen 15 °-30 ° at the jet angle α perpendicular to casting roller direction; The angle of inclination nozzle spray angle is chosen 60 °-110 ° at the jet angle β that is parallel to casting roller direction.
5. according to claim 1 or claim 2 method is characterized in that the expulsion pressure of said nozzle, for compressed air air pressure greater than 0.2Mpa, discharge 0.1-0.5l/min.
6. the method for claim 1 need be carried 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 the 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 a corrected parameter, span 1.0-2.0; n
iThe nozzle number in i district; w
sThe current mean value of single-nozzle.
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 |
Applications Claiming Priority (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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| CN102423796A true CN102423796A (en) | 2012-04-25 |
| CN102423796B CN102423796B (en) | 2013-11-06 |
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| CN 201110388210 Active 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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Cited By (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 |
| CN103464708A (en) * | 2013-09-06 | 2013-12-25 | 上海宝锋工程技术有限公司 | Secondary cooling nozzle arranging method for silicon steel slab continuous casting |
| CN112692247A (en) * | 2020-12-03 | 2021-04-23 | 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 |
| CN112692248A (en) * | 2020-12-03 | 2021-04-23 | 广西柳钢华创科技研发有限公司 | Method for treating surface scratches of continuous casting slab |
| CN112756576A (en) * | 2020-12-03 | 2021-05-07 | 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 |
| CN112756575A (en) * | 2020-12-03 | 2021-05-07 | 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 |
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| 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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2011
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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 |
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Cited By (10)
| 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 |
| CN103464708A (en) * | 2013-09-06 | 2013-12-25 | 上海宝锋工程技术有限公司 | Secondary cooling nozzle arranging method for silicon steel slab continuous casting |
| 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 |
| CN112692247A (en) * | 2020-12-03 | 2021-04-23 | 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 |
| CN112692248A (en) * | 2020-12-03 | 2021-04-23 | 广西柳钢华创科技研发有限公司 | Method for treating surface scratches of continuous casting slab |
| CN112756576A (en) * | 2020-12-03 | 2021-05-07 | 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 |
| CN112756575A (en) * | 2020-12-03 | 2021-05-07 | 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 |
| 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 |
| 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 |
| CN112692248B (en) * | 2020-12-03 | 2022-03-11 | 广西柳钢华创科技研发有限公司 | Method for treating surface scratches of continuous casting slab |
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