CN101564761B - Method for heating meniscus of twin roll thin strip casting pool - Google Patents
Method for heating meniscus of twin roll thin strip casting pool Download PDFInfo
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- CN101564761B CN101564761B CN2008100366864A CN200810036686A CN101564761B CN 101564761 B CN101564761 B CN 101564761B CN 2008100366864 A CN2008100366864 A CN 2008100366864A CN 200810036686 A CN200810036686 A CN 200810036686A CN 101564761 B CN101564761 B CN 101564761B
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Abstract
The invention discloses a method for heating a meniscus of a twin roll thin strip casting pool, wherein the upper side of the twin roll thin strip casting pool is provided with a reflecting housing and a corresponding quartz glass panel, a heating light tube is arranged in a focus position inside the reflecting cover, the shape of the inner wall of the reflecting cover is in a semi-ellipsoid shape, and another ellipsoid focus formed by the inner wall of the reflecting cover is positioned at a meniscus position of a flow distributor or a side sealing plate in a casting pool, thereby on-line heating insulation to the part which is easy to have cold steel in the thin strip casting pool and includes the meniscus on the side sealing plate and the flow distributor is realized. The invention performs the heat insulation to the thin strip casting pool and prevents cold steel from being formed because of radiation of molten steel in the casting pool, the flow distributor and the side sealing plate in the production process, thereby reducing negative influence on product quality and production continuity by the cold steel, improving the quality of the thin strip casting edge part, increasing the surface quality of casting strips, prolonging casting time and improving stability of thin strip casting system.
Description
Technical field
The present invention relates to continuous casting process, particularly a kind of meniscus of twin roll thin strip casting pool heating means.
Background technology
The twin-roll thin strip continuous casting technical development has had the history in 150 years, belong to the inferior continuous casting process of cooling fast category, typical example as shown in Figure 1, directly pouring molten steel is relatively rotated the chill roll 1a that also can cool off fast at one by two, 1b and lateral seal 2a, in the molten bath that 2b surrounds, the peripheral surface that molten steel rotates at the crystallization roller is cooled and solidifies, and then the formation solidified shell is also grown gradually then at two crystallization roller 1a, minimum place, 1b roll gap crack is pressed together, form the thick metal thin strip 4 of 1-5mm at band outlet at last, band 4 is sent into the strip that is rolled into 0.7-2.5mm in the milling train 7 via guide plate 5 guiding by pinch roll 6, drive through spray cooling device 9 by rollgang 8 then and cool off, send at last to batch and dispatch from the factory.
Different with traditional continuous casing, this method need not passed through the multiple tracks hot-rolled process, can simplify the strip production technology greatly and reduce equipment investment.In addition, because the setting time of metal is shorter in the whole production process, so the intensity of the refinement of thin strap continuous casting product grains, material, toughness percentage elongation increase, setting rate also helps suppressing elements segregation soon simultaneously.
The subject matter that present this technology exists:
Casting cycle control method complexity, in casting cycle, factors such as the setting rate of molten steel and crystallization roller velocity of rotation, molten metal pool level, crystallization roller gap and steel quality have confidential relation, if seek the problem that the optimum Match of various technological parameters is more complicated;
In addition, thin belt continuous casting molten pool is much smaller than traditional processing technology, and in order to improve the surface quality of Cast Strip, must guarantee molten steel distributed uniform in the molten bath, also will install current distribution device additional in the molten bath, will install side seal board additional in limit portion.After molten steel casting arrives in the molten bath, except that the cooling effect that is subjected to the crystallization roller, also be subjected to the cooling effect of current distribution device and side seal board and the influence that molten steel dispels the heat in air, cause in the molten bath molten steel to cross cold easily and on current distribution device and side seal board, form cold bloom, simultaneously, the erratic fluctuations of molten metal pool level also can cause forming cold steel in the casting cycle in the molten bath.When cold steel is grown up gradually to a certain degree falling in the molten bath, cause the sudden change of casting-rolling force in the casting cycle, form defectives such as cold shut crackle on the surface, Cast Strip easily, had a strong impact on the surface quality of Cast Strip, can form broken belt when serious, cause production process to be interrupted.The sudden change of this roll-force also can be impacted the service life of having reduced the crystallization roller to the formation of crystallization roller.
In order to reduce the harmful effect that cold steel is produced thin strap continuous casting, adopted several different methods that cool region is crossed in the part and carried out heat tracing and handle, prevent to cause cold steel owing to the mistake of subregion is cold.
One of them important method adopts electromagnetic-induction heating method exactly, patent WO2000037199, JP 2155543 etc. are exactly to come near the molten steel the side seal board is heated installing induction generator additional in thin belt continuous casting molten pool side seal board back, prevent the cold steel of knot on side seal board.
Chinese patent CN98229485.9 has related to a kind of double-roller continuous casting machine electric heating lateral seal, has installed a cover resistance heater in pool side shrouding back additional and has heated, and makes side seal board keep the condition of high temperature in casting process always, prevents the formation of cold steel.
In addition, Japan Patent JP 7290202 has introduced a kind of molten bath limit portion insulating cover, promptly above thin strap continuous casting limit portion molten bath, a parabolic type stay-warm case is housed, meniscus on the side seal board just in time is positioned on the focus of parabola stay-warm case, can make like this that the molten steel reflect radiation heat is pooled on the focus in the molten bath, make to keep higher temperature near the meniscus, prevent to tie cold steel, make the carrying out that casting process can the long period.
Summary of the invention
Purpose of the present invention provides a kind of meniscus of twin roll thin strip casting pool heating means, thin belt continuous casting molten pool is carried out heat tracing, prevent in process of production, owing to the heat radiation of molten steel, current distribution device and side seal board in the molten bath forms cold steel, reduce cold steel the continuity of product quality and production is had a negative impact, improve the thin strap continuous casting quality of edges, improve surface quality of casting belt, prolong the duration of pouring, improve the stability of thin strap continuous casting system.
For achieving the above object, technical scheme of the present invention is,
Thin belt continuous casting molten pool heating means of the present invention are to utilize to focus on the heating principle with external thermal source---the light of heating fluorescent tube emission, through behind the reflector reflect focalization of particular design, on another focus, energy is accumulated again, realization comprises that to the position of tying cold steel in the thin belt continuous casting molten pool easily the meniscus on side seal board and the current distribution device carries out online heat tracing, avoid influencing the sustainability of cast production and the stability of product because current distribution device and side seal board temperature are crossed the low cold steel that forms in process of production.
Particularly, a kind of meniscus of twin roll thin strip casting pool heating means of the present invention, one reflector and corresponding quartz glass panel are set above thin belt continuous casting molten pool, the inner wall shape of reflector is a semielliptical shape, a heating fluorescent tube is adorned in a focal position in reflector, another ellipsoid focus that the reflector inwall forms is arranged in the meniscus position of molten bath current distribution device or side seal board, realizes the position of tying cold steel in the thin belt continuous casting molten pool is easily comprised that the meniscus on side seal board or the current distribution device carries out online heat tracing.
Further, the heating fluorescent tube is a halogen lamp tube, so that enough heats to be provided meniscus is heated.
Described heating fluorescent tube is equipped with the quartz glass protective casing outward, is connected with the compressed air that fluorescent tube is cooled off in protective casing, the service life of prolonging lamp tube.
Again, described reflector inwall is coated with one and strengthens the coating of realizing that reflect heat focuses on, and the coating material is pure gold, silver or chromium; This reflector thickness of coating is 1um～2000um, can select as required.
In addition, the heater that is used for the meniscus of twin roll thin strip casting pool heating means of the present invention comprises, a reflector, and its inner wall shape is a semielliptical shape; Inwall is coated with one and strengthens the coating of realizing that reflect heat focuses on; The quartz glass panel is installed in the reflector end face; The heating fluorescent tube is arranged on the focal position in the reflector.
Described heating fluorescent tube is equipped with the quartz glass protective casing outward; The heating fluorescent tube is a halogen lamp tube.
When thin strap continuous casting is produced, be positioned at the heating fluorescent tube light radiation form radiations heat energy of reflector ellipsoid focal position, after the reflection through the ellipsoid reflector, converge in again on the focus at meniscus place in the molten bath, thereby realization is to the heating of current distribution device in the thin belt continuous casting molten pool and side seal board meniscus.
The difference of the present invention and prior art and improvements
In the existing strip continuous casting technology the contactless heating means of main employing are heated in the molten bath.Method as having adopted a kind of contactless high-frequency electromagnetic induction to heat among patent WO 2000037199, the JP 2155543 installs induction generator additional and comes near the molten steel the side seal board is heated in the thin-strip casting side sealing plate back, prevent to tie cold steel.The subject matter that this method exists is that thin strap continuous casting triangle molten bath is very little, and is also very little at the installing space of side seal edge portion, and side seal board also needs certain top strength power simultaneously, and this installation and action effect influence to induction generator is bigger.And, for the meniscus that current distribution device contacts with molten steel, limited by the installation site, this heating means can not be suitable for; And to be heaters the be contactless focusing heating of the advantage of heating means of the present invention is relatively independent, not influenced by miscellaneous equipment, can heat side seal board and current distribution device meniscus.
Japan Patent JP07290202 has introduced a kind of molten bath limit portion insulating cover, promptly above thin strap continuous casting limit portion molten bath, a parabolic type stay-warm case is housed, meniscus on the side seal board just in time is positioned on the focus of parabola stay-warm case, can make like this that the molten steel reflect radiation heat is pooled on the focus in the molten bath, keep higher temperature near making meniscus, prevent to tie cold steel.The subject matter that this method exists:
At first, this patent does not have external thermal source, can only utilize the reverberation of molten bath molten steel to be incubated.Heat insulation effect is subjected to the influence of thermal source (that is: molten steel area of dissipation in the molten bath) bigger.If want to reach the effect of insulation heating, must guarantee in the molten bath, will to have the fresh molten steel heat radiation of very large area could guarantee the heat insulation effect of this device, be difficult to realization in actual applications.And for the same current distribution device of cold steel and the meniscus that contacts of molten steel of forming easily, owing to there not being enough thermal source reflect focalization heats, this method can't reach heat insulation effect.And the present invention introduces external thermal source, adopts halogen lamp tube to focus on heating, and thermal source is relatively independent, as long as enough heating powers are arranged, just can guarantee all meniscus are heated.
Secondly, this patent can't be carried out preheating to meniscus position in advance.Must carry out after cast experiment beginning (because must guarantee in the molten bath molten steel is arranged), and in actual experiment, the easiest generation incipient time the from pouring molten steel of the generation of cold bloom is because the thermograde maximum of side seal board and molten steel at this moment.Obviously, this patent can't preheat in advance to the side seal board meniscus position, makes it prevent that the effect of tying cold steel from having a greatly reduced quality.And the benefit of a maximum of patent of the present invention exactly can be by external independently thermal source---the heating fluorescent tube shifted to an earlier date The pre-heat treatment to the side seal board meniscus before cast experiment beginning, this will strengthen the thermal effect that adds to meniscus, significantly improve in the cold steel phenomenon of the knot at meniscus place.
Once more, this patent stay-warm case focus overlaps location difficulty with meniscus.Owing to adopt stay-warm case that the heat emission of molten steel is focused on the meniscus of side seal board, meniscus position changes with molten steel liquid level, therefore, the accurate location of stay-warm case can overlap with meniscus by focus point to guarantee heat, is to guarantee that insulation adds the deciding factor of thermal effect.For guaranteeing experiment effect, must adjust to guarantee that focus overlaps with meniscus the stay-warm case position.In this patent, stay-warm case to be adjusted to guarantee that focus overlaps with meniscus, process is very complicated, and stay-warm case is difficult for accurately locating in the cold conditions debug process, is difficult in the casting process adjust according to actual molten steel liquid level.And in the present invention, because heating system is relatively independent, in the cold conditions position fixing process, fluorescent tube can be opened, the speck that forms according to light focusing is adjusted the height and the angle of heating system, makes to converge focus and overlap with the meniscus of target setting liquid level formation.In actual casting process, can adjust the angle of heater according to liquid level actual detected value, to guarantee that converging focus overlaps with the meniscus that actual liquid level goes out.
In addition, this patent must be on molten steel all the covering and heat insulating covers could guarantee that meniscus is had certain heat insulation effect, this will inevitably influence other operates, as to the detection of molten metal pool level etc.And patent of the present invention adopts external thermal source, and heater is little, moves flexibly, can not exert an influence to other operations.
Beneficial effect of the present invention
1. the present invention can avoid forming cold steel because the mistake of thin-strip casting side sealing plate and current distribution device is cold in the molten bath, can improve the quality of edges of Cast Strip.Strip edge portion quality is good, boundless silk and tear phenomenon;
2. the present invention can avoid cold steel to form and cause broken belt or stop watering, and prolongs the duration of pouring of thin strap continuous casting, raises labour productivity;
3. the present invention can avoid cold steel to form, and it is more stable that the thin strap continuous casting roll-force is changed, and do not have sudden change, helps the precision of retentive control system;
4. the present invention can reduce the Cast Strip thickness deviation, and the surface, Cast Strip can not exist because of the uneven crackle that produces of tape thickness, and Cast Strip cross section tissue is evenly distributed;
5. the irregular part of limit portion of Cast Strip of the present invention is less, significantly reduces the cold rolling side cut of follow-up work and the smooth workload of waiting, but increases the rolled products size, improves the availability of material.
Description of drawings
Fig. 1 is the thin strap continuous casting process schematic representation;
Fig. 2 is the schematic diagram of the embodiment of the invention.
The specific embodiment
Referring to Fig. 2, it is depicted as one embodiment of the present of invention, in the thin strap continuous casting technology, thin belt continuous casting molten pool is one and relatively rotates by two and the chill roll and the lateral seal that can cool off fast surround, one reflector 1 and corresponding quartz glass panel 2 are set above thin belt continuous casting molten pool, a heating fluorescent tube 3 is adorned in focal position in reflector 1, heating fluorescent tube 3 is a halogen lamp tube, outside the heating fluorescent tube 3 quartz glass protective casing 4 is housed, in protective casing 4, is connected with the compressed air that fluorescent tube is cooled off; The inner wall shape of reflector 1 is a semielliptical shape, the ellipsoid focus that reflector 1 inwall forms is arranged in meniscus 51 positions of molten bath 5 current distribution devices 6 or side seal board 7, realizes the position of tying cold steel in the thin belt continuous casting molten pool is easily comprised that the meniscus on side seal board and the current distribution device carries out online heat tracing.
Described reflector 1 inwall is coated with one and strengthens the coating of realizing that reflect heat focuses on, and the coating material is pure gold, silver or chromium; Thickness of coating is 1um～2000um.
When thin strap continuous casting begins to pour into a mould (or before cast, can determine according to experimental technique and environmental working condition) heater starts working, reflex by reflector 1, will be from the light radiation reflect focalization of heating lamp pipe 3 to meniscus 51, meniscus 51 is heated or preheating, prevent owing to side seal board is crossed the cold cold steel that forms.
In sum, thin belt continuous casting molten pool heating means utilization of the present invention focuses on the heating principle will heat the light of fluorescent tube emission, behind the reflector reflect focalization, on another focus, energy is accumulated again, realization comprises that to the position of tying cold steel in the thin belt continuous casting molten pool easily the meniscus on side seal board and the current distribution device carries out online heat tracing, avoid influencing the sustainability of cast production and the stability of product because current distribution device and side seal board temperature are crossed the low cold steel that forms in process of production.
Claims (5)
1. meniscus of twin roll thin strip casting pool heating means, one reflector and corresponding quartz glass panel are set above thin belt continuous casting molten pool, the inner wall shape of reflector is a semielliptical shape, a heating fluorescent tube is adorned in a focal position in reflector, another ellipsoid focus that the reflector inwall forms is arranged in the meniscus position of molten bath current distribution device or side seal board, realizes the position of tying cold steel in the thin belt continuous casting molten pool is easily comprised that the meniscus on side seal board or the current distribution device carries out online heat tracing.
2. meniscus of twin roll thin strip casting pool heating means as claimed in claim 1 is characterized in that, described heating fluorescent tube is a halogen lamp tube.
3. meniscus of twin roll thin strip casting pool heating means as claimed in claim 1 or 2 is characterized in that, described heating fluorescent tube is equipped with the quartz glass protective casing outward, is connected with the compressed air that fluorescent tube is cooled off in protective casing.
4. meniscus of twin roll thin strip casting pool heating means as claimed in claim 1 is characterized in that, described reflector inwall is coated with one and strengthens the coating of realizing that reflect heat focuses on, and the coating material is pure gold, silver or chromium.
5. meniscus of twin roll thin strip casting pool heating means as claimed in claim 4 is characterized in that, described reflector thickness of coating is 1um～2000um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100366864A CN101564761B (en) | 2008-04-25 | 2008-04-25 | Method for heating meniscus of twin roll thin strip casting pool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100366864A CN101564761B (en) | 2008-04-25 | 2008-04-25 | Method for heating meniscus of twin roll thin strip casting pool |
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| CN101564761A CN101564761A (en) | 2009-10-28 |
| CN101564761B true CN101564761B (en) | 2011-05-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104972081B (en) * | 2015-07-14 | 2017-03-01 | 燕山大学 | A kind of pre-heating mean overall to thin-belt casting rolling current distribution device and side seal board and device |
| CN110095416B (en) * | 2019-04-29 | 2021-10-08 | 西北核技术研究所 | Metal molten pool laser absorption rate distribution on-line measuring system and method |
| CN113927000B (en) * | 2020-06-29 | 2022-12-16 | 宝山钢铁股份有限公司 | Thin strip continuous casting structure and method for removing cold steel on surface of molten pool thereof |
Citations (3)
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|---|---|---|---|---|
| CN2222866Y (en) * | 1994-12-23 | 1996-03-20 | 立胜(四川)科技发展有限公司 | Energy-saving evenly heating equipment |
| CN2346526Y (en) * | 1998-09-09 | 1999-11-03 | 重庆钢铁(集团)有限责任公司 | Electrothermal side sealing device of double roller continuous caster |
| CN2912509Y (en) * | 2006-07-11 | 2007-06-20 | 中国医学科学院生物医学工程研究所 | Heating deivce for optical and thermal radiation pain measurement |
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- 2008-04-25 CN CN2008100366864A patent/CN101564761B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2222866Y (en) * | 1994-12-23 | 1996-03-20 | 立胜(四川)科技发展有限公司 | Energy-saving evenly heating equipment |
| CN2346526Y (en) * | 1998-09-09 | 1999-11-03 | 重庆钢铁(集团)有限责任公司 | Electrothermal side sealing device of double roller continuous caster |
| CN2912509Y (en) * | 2006-07-11 | 2007-06-20 | 中国医学科学院生物医学工程研究所 | Heating deivce for optical and thermal radiation pain measurement |
Non-Patent Citations (3)
| Title |
|---|
| JP平2-155543A 1990.06.14 |
| JP昭61-245949A 1986.11.01 |
| JP特开平7-290202A 1995.11.07 |
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