CN101920323B - Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback - Google Patents
Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback Download PDFInfo
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Abstract
The invention relates to a dynamic soft reduction method for detecting the tail end of a solidified liquid core of a casting blank based on pressure feedback, belonging to the technical field of metallurgy continuous casting control. The method comprises the following steps of: firstly, establishing a control platform for remotely and automatically adjusting roll gaps of all sector sections on a continuous casting machine, and calculating the stress of the casting blank in different sector sections by utilizing the detection result of pressure sensors installed on all the sector sections; detecting the stress difference of the casting blank in each sector section during roll gap variation by changing the roll gap contraction size of each sector section; judging the position of the tail end of the solidified liquid core of the casting blank according to the stress difference between the casting blank with the liquid core and the casting blank without the liquid core; and finally, dynamically adopting different reduction quantities in all sector sections of a casting machine by using a soft reduction control system according to the position of the tail end of the liquid core judged by the method. The method for judging the tail end of the solidified liquid core of the casting blank is directly obtained by calculating the real-time stress of the casting blank. Because the calculation of casting blank surface temperature and blank shell thickness does not need a large quantity of mathematical models, the calculation method is simple and effective and ensures the stability and the execution efficiency of a casting machine control system.
Description
Affiliated technical field:
The present invention relates to a kind of dynamic soft reduction method that detects tail end of solidified liquid core of casting blank based on pressure feedback, belong to metallurgical continuous casting control technology field.
Background technology:
In continuous casting production process, the high-temperature liquid state molten steel is continuous casting and solidifying in the equipment that is comprised of crystallizer and fan-shaped section, forms the strand with certain thickness liquid core, and the liquid core is cooling and solidify continuously, finally forms the solid slab.Because solidification shrinkage has occured molten steel in process of setting, so crystallizer has certain taper; The roll gap of fan-shaped section is designed to the form of contraction continuously simultaneously, be used for compensating the solidification shrinkage amount, if compensate for shrinkage amount and actual solidification shrinkage amount are inconsistent, if particularly shrink can not effective compensation for the liquid core of solidification end, can form the internal flaws such as segregation, loose, shrinkage cavity and crackle in the strand centre; This defective may form the defectives such as layering in the follow-up operation of rolling, board quality and performance are had material impact, even causes sheet material directly to be sentenced useless.The roll gap system designing that in casting process, strand molten steel Solid State Contraction is compensated, and utilize segment roll gap to carry out certain contraction of depressing to the liquid core of solidification end, be called light Reduction Technology.Light Reduction Technology is divided into static soft reduction and dynamic soft-reduction, and static soft reduction is changeless for the roll gap contraction system of formulating, and amount of contraction can not be changed in casting process; The roll gap contraction system of dynamic soft-reduction is dynamic change, according to the casting process changes in process parameters, dynamically adjusts amount of contraction and the punctured position of segment roll gap.
Dynamic soft reduction technology is the core technology of high-end slab product continuous casting, by dynamic adjustment depressing position and drafts, the solidification end of base shell is carried out feeding.Good dynamic soft reduction technology can accurately track the solidification end of strand, can improve Inner Quality of Billet after enforcement, reduces the defectives such as the layering of sheet material, loose and segregation, is the key technology that improves board quality.The difficult point of this technology is due in continuous casting production process, the technological parameter such as liquid steel temperature, pulling rate often changes, cause the solidification end position meeting dynamic change of strand, if can not correctly detect or forecast tail end of solidified liquid core of casting blank, position or the drafts gently depressed are improper, be difficult to improve slab quality, even can worsen slab quality and cause the accident.
The light Reduction Technology of conventional dynamic determines that the method for casting blank solidification end is: Mathematical Modeling is set up in the heat transfer in casting process and the behavior of solidifying, according to steel grade molten steel temperature, pulling rate and cooling parameter, the temperature field of calculating strand distributes and shell thickness, then forecast solidification end position implements to shrink larger drafts than common roll gap in this position.The shortcoming of this technology is: because the terminal position of solidification liquid core is the theoretical gained that calculates, very large with the fine or not relation of calculating model used, computational methods are also more complicated, and computing time is long; And it is more difficult with checking to lack the direct-detection foundation.Actual production process is and more complicated many due to influence factor, causes the positional accuracy of the tail end of solidified liquid core that forecasts relatively poor, causes controlling the poor stability of effect.
Summary of the invention:
The object of the invention is to provide a kind of dynamic soft reduction method that detects tail end of solidified liquid core of casting blank based on pressure feedback, improves Inner Quality of Billet, reduces the quality problems such as loose and segregation, solves the problems referred to above that exist in background technology.
Technical scheme of the present invention is:
A kind of dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank comprises following steps: be accurate judgement tail end of solidified liquid core of casting blank position, at first set up the control platform that the long-range roll gap of each fan-shaped section is regulated automatically on conticaster; Then utilize the pressure sensor testing result that is arranged on each fan-shaped section, calculate strand at the regional pressure of different fan-shaped section; Shrink size by changing each segment roll gap, strand force difference in each fan-shaped section when detecting the roll gap variation; Contain the liquid core and do not contain liquid core strand force difference by contrast, judge the tail end of solidified liquid core of casting blank position; According to the method judgement liquid core terminal position, utilize light depress control system dynamically to take different drafts in each fan-shaped section of casting machine at last.
Step more specifically:
1. distinguish setting pressure sensor and displacement transducer on the hydraulic cylinder of each fan-shaped section of casting machine, and the PLC control system;
2. set up the long-range roll gap regulation and control system of computer network system and fan-shaped section, Real-time Collection pressure sensor and displacement transducer show value, and accurately control each fan-shaped section according to computer instruction and rise and the decline displacement, control accuracy is 0.01mm;
3. set up according to the stressed mechanical model of sensor Analysis of test results strand, detect strand solidified tail end of liquid core position according to the strand pressure;
4. according to detecting strand solidified tail end of liquid core change in location, dynamically definite each fan-shaped section is depressed pattern, implements to water continuously the punching block formula under the dynamic soft-reduction state of a control.
Dynamic soft reduction technology of the present invention is different from the light Reduction Technology of conventional dynamic, the method of its judgement strand solidified tail end of liquid core is not to adopt model to calculate and forecast, but utilize the pressure sensor that is arranged on each fan-shaped section to detect the stressed of strand, by the stressed of strand in each fan-shaped section analyzed, relatively contain the liquid core and do not contain the stressed difference of strand of liquid core, the position of judgement tail end of solidified liquid core; Then according to the liquid core terminal position of the method judgement, dynamically take different drafts in each fan-shaped section, improve Inner Quality of Billet, reduce the quality problems such as loose and segregation, strand segregation and loose can 95% being controlled in C class 1.5.
The present invention compared with prior art main feature of the present invention has:
1. different from the light Reduction Technology of conventional dynamic, the method for its judgement strand solidified tail end of liquid core is not to adopt model to calculate and forecast, but utilizes the real-time stress of strand to calculate rear direct acquisition, and therefore, the location prediction of its strand solidified tail end of liquid core is accurate; And can what accurately judge the strand solidified tail end of liquid core be the key that dynamic soft reduction technology improves slab quality;
2. because this method does not need a large amount of calculated with mathematical model casting blank surface temperature and shell thickness, the algorithm of its judgement liquid core position is simply effective, can save computer resource, guarantees the casting machine control system and carries out efficient.
Description of drawings:
Fig. 1 is not for containing the strand pressure history schematic diagram of liquid core;
Fig. 2 is the strand pressure history schematic diagram that contains the liquid core.
Below in conjunction with accompanying drawing, the invention will be further described by embodiment.
In an embodiment, the concrete implementation step of dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank is:
1. distinguish setting pressure sensor and displacement transducer on the hydraulic cylinder of each fan-shaped section of casting machine, and the PLC control system; 2. set up the long-range roll gap regulation and control system of computer network system and fan-shaped section, Real-time Collection pressure sensor and displacement transducer show value, and accurately control each fan-shaped section according to computer instruction and rise and the decline displacement, control accuracy is 0.01mm; 3. set up according to the stressed mechanical model of sensor Analysis of test results strand, detect strand solidified tail end of liquid core position according to the strand pressure;
The position of detecting casting blank solidification end is in fact position how to distinguish the strand place fan-shaped section that contains the liquid core and do not contain the liquid core, according to containing liquid core and the different characteristics of pressure history that the strand that does not contain the liquid core feeds back when pressure changes, distinguish the position of the strand place fan-shaped section that contains the liquid core and do not contain the liquid core;
(1) with reference to accompanying drawing 1, to not containing liquid core strand, because this regional strand solidifies fully, belonging to solid-state directly depresses, when strand was implemented the 0.3mm drafts, strand pressure moment rose to maximum, and pressure changes more stable, its slope of a curve scope is between 0.8-1.0, and strand pressure fluctuation amplitude is at 0-8t; Lifting in enforcement, pressure changes opposite;
(2) with reference to accompanying drawing 2, to containing liquid core strand, because this regional strand does not solidify fully, have outside belonging to the water bag of liquid core structure is arranged in the base shell, when strand was implemented the 0.3mm drafts, the pressure of strand progressively rose to maximum according to certain gradient, and fluctuation is larger; Its slope of a curve scope is between 0.3-0.8, and strand pressure fluctuation amplitude is at 0-15t; Lifting in enforcement, pressure changes opposite;
Normally pour into a mould the stage at casting machine, system every ten minutes carries out depressing and lifting of 0.3mm to the strand of each fan-shaped section successively, the strand force difference in more different fan-shaped section, and the position of judgement strand solidified tail end of liquid core is in which fan-shaped section zone;
4. according to detecting strand solidified tail end of liquid core change in location, dynamically definite each fan-shaped section is depressed pattern, implements to water continuously the punching block formula under the dynamic soft-reduction state of a control;
On step basis 3., according to analytical cycle, when judging that the strand solidified tail end of liquid core is n fan-shaped section, to n-1, n and n+1 fan-shaped section take respectively to shrink 1.5mm, 1.5mm with 0.8mm drafts control model, other fan-shaped section is implemented to shrink 0.3mm drafts control model.
Specific embodiment:
Embodiment one, slab caster, and section 1800 * 230, the casting machine structure: No. 0 is sufficient roller section, altogether the 1-10 fan-shaped section.Cast steel grade: Q235A connects and waters stove number totally 14 stoves, chooses the 4th stove, 1544 ℃ of tundish temperatures, pulling rate 0.90-0.95m/min.Water under the punching block formula at dynamic soft-reduction, detect No. 5 interior strand pressure size of fan-shaped section at 50t, 0.3mm is lifted and pressed down to fluctuation amplitude at 2-14t on roll gap, and the slope range of strand feedback pressure change curve is between 0.40-0.75; In No. 6 fan-shaped section, strand pressure size is 68, and fluctuation amplitude is at 0-5t, and the slope range of change curve is between 0.75-1.00.No. 7 fan-shaped section, No. 8 interior strand pressure sizes of fan-shaped section are at 85t, and fluctuation amplitude is at 0-5.5t, and the slope range of change curve is between 0.9-1.0.Therefore, judgement strand solidified tail end of liquid core is in No. 6 fan-shaped section.Gently depress and water the steel control model and be: it is 0.3mm that 1-4 segment roll gap amount of contraction is controlled target, the 5th, 6, No. 7 segment roll gap amounts of contraction are controlled target and are respectively 1.5mm, 1.5mm and 0.8mm, it is 0.3mm that 8-10 segment roll gap amount of contraction is controlled target.In steel pouring process, the actual roll gap amount of contraction of 1-4 fan-shaped section is 0.2-0.5mm; No. 5 fan-shaped section and No. 6 actual roll gap amount of contraction of fan-shaped section 1.3-1.8mm; No. 7 the actual roll gap amount of contraction of fan-shaped section is 0.4-0.9mm; The actual roll gap amount of contraction of 8-10 fan-shaped section 0.2-0.6mm.Control effect: to four of strand samplings in this zone, carry out the pickling check, the inner segregation of strand is C class 1.5.
Embodiment two, slab caster, and section 1800 * 230, the casting machine structure: No. 0 is sufficient roller section, altogether the 1-10 fan-shaped section.Cast steel grade: Q345B connects and waters stove number totally 8 stoves, chooses the 3rd stove, 1542 ℃ of tundish temperatures, pulling rate 0.85-0.90m/min.Water under the punching block formula at dynamic soft-reduction, detect No. 6 interior strand pressure size of fan-shaped section at 60t, 0.3mm is lifted and pressed down to fluctuation amplitude at 2-15t on roll gap, and the slope range of strand feedback pressure change curve is between 0.45-0.70; In No. 7 fan-shaped section, strand pressure size is 75, and fluctuation amplitude is at 0-5t, and the slope range of change curve is between 0.85-1.00.In No. 8 fan-shaped section, strand pressure size is at 80t, and fluctuation amplitude is at 0-5.5t, and the slope range of change curve is between 0.9-1.0.Therefore, judgement strand solidified tail end of liquid core is in No. 7 fan-shaped section.Gently depress and water the steel control model and be: it is 0.3mm that 1-5 segment roll gap amount of contraction is controlled target, the 6th, 7, No. 8 segment roll gap amounts of contraction are controlled target and are respectively 1.5mm, 1.5mm and 0.8mm, it is 0.3mm that the 9th, No. 10 segment roll gap amount of contraction controlled target.In steel pouring process, the actual roll gap amount of contraction of 1-5 fan-shaped section is 0.2-0.5mm; The 6th fan-shaped section and No. 7 actual roll gap amount of contraction of fan-shaped section 1.3-1.8mm; No. 8 the actual roll gap amount of contraction of fan-shaped section is 0.4-0.9mm; The 9th, No. 10 actual roll gap amount of contraction of fan-shaped section 0.2-0.6mm.Control effect: to two of strand samplings in this zone, carry out the pickling check, the inner segregation of strand is C class 1.5.
Embodiment three, slab caster, and section 1800 * 230, the casting machine structure: No. 0 is sufficient roller section, altogether the 1-10 fan-shaped section.Cast steel grade: A32 connects and waters stove number totally 9 stoves, chooses the 5th stove, 1546 ℃ of tundish temperatures, pulling rate 0.85-0.9m/min.Water under the punching block formula at dynamic soft-reduction, detect No. 7 interior strand pressure size of fan-shaped section at 75t, 0.3mm is lifted and pressed down to fluctuation amplitude at 1-14t on roll gap, and the slope range of strand feedback pressure change curve is between 0.40-0.60; In No. 8 fan-shaped section, strand pressure size is 70, and fluctuation amplitude is at 0-7t, and the slope range of change curve is between 0.80-0.90.In No. 9 fan-shaped section, strand pressure size is at 77t, and fluctuation amplitude is at 0-4.5t, and the slope range of change curve is between 0.85-1.00.Therefore, judgement strand solidified tail end of liquid core is in No. 8 fan-shaped section.Gently depress and water the steel control model and be: it is 0.3mm that 1-6 segment roll gap amount of contraction is controlled target, and the 7th, 8, No. 9 segment roll gap amounts of contraction are controlled target and are respectively 1.5mm, 1.5mm and 0.8mm, and it is 0.3mm that No. 10 segment roll gap amount of contraction controlled target.In steel pouring process, the actual roll gap amount of contraction of 1-6 fan-shaped section is 0.2-0.4mm; No. 7 fan-shaped section and No. 8 actual roll gap amount of contraction of fan-shaped section 1.3-1.7mm; No. 9 the actual roll gap amount of contraction of fan-shaped section is 0.5-0.9mm; No. 10 actual roll gap amount of contraction of fan-shaped section 0.2-0.6mm.Control effect: to three of strand samplings in this zone, carry out the pickling check, the inner segregation rank of strand is respectively C class 1.5, C class 1.5 and C class 2.0.
Claims (2)
1. dynamic soft reduction method that detects tail end of solidified liquid core of casting blank based on pressure feedback, it is characterized in that comprising following steps: for accurate judgement tail end of solidified liquid core of casting blank position, at first set up the control platform that the long-range roll gap of each fan-shaped section is regulated automatically on conticaster; Then utilize the pressure sensor testing result that is arranged on each fan-shaped section, calculate strand at the regional pressure of different fan-shaped section; Shrink size by changing each segment roll gap, strand force difference in each fan-shaped section when detecting the roll gap variation; Contain the liquid core and do not contain liquid core strand force difference by contrast, judge the tail end of solidified liquid core of casting blank position; According to the method judgement liquid core terminal position, utilize light depress control system dynamically to take different drafts in each fan-shaped section of casting machine at last; Step more specifically:
1. distinguish setting pressure sensor and displacement transducer on the hydraulic cylinder of each fan-shaped section of casting machine, and the PLC control system;
2. set up the long-range roll gap regulation and control system of computer network system and fan-shaped section, Real-time Collection pressure sensor and displacement transducer show value, and accurately control each fan-shaped section according to computer instruction and rise and the decline displacement, control accuracy is 0.01mm;
3. set up according to the stressed mechanical model of sensor Analysis of test results strand, detect strand solidified tail end of liquid core position according to the strand pressure;
4. according to detecting strand solidified tail end of liquid core change in location, dynamically definite each fan-shaped section is depressed pattern, implements to water continuously the punching block formula under the dynamic soft-reduction state of a control;
The position of detecting casting blank solidification end is according to the position that contains liquid core and the different characteristics of pressure history that the strand that does not contain the liquid core feeds back when pressure changes, how to distinguish the strand place fan-shaped section that contains the liquid core and do not contain the liquid core; Casting machine is normally poured into a mould the stage, and system every ten minutes carries out depressing and lifting of 0.3mm to the strand of each fan-shaped section successively, the strand force difference in more different fan-shaped section, and the position of judgement strand solidified tail end of liquid core is in which fan-shaped section zone.
According to claim 1 detect the dynamic soft reduction method of tail end of solidified liquid core of casting blank based on pressure feedback, it is characterized in that when judgement strand solidified tail end of liquid core n fan-shaped section, to n-1, n and n+1 fan-shaped section take respectively to shrink 1.5mm, 1.5mm with 0.8mm drafts control model, other fan-shaped section is implemented to shrink 0.3mm drafts control model.
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| CN102601324B (en) * | 2012-03-14 | 2013-07-17 | 北京科技大学 | High-temperature experimental apparatus and method for research on mechanism of continuous casting soft-reduction |
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| CN108380837B (en) * | 2018-01-31 | 2019-11-08 | 中冶连铸技术工程有限责任公司 | A kind of method of determining slab specific location solidification geomery |
| CN109711113B (en) * | 2019-03-12 | 2023-05-19 | 东北大学 | Method for predicting segregation behavior under heavy pressure of bloom convex roller continuous casting |
| CN111687388B (en) * | 2020-06-28 | 2022-04-08 | 中冶赛迪工程技术股份有限公司 | Method for improving stability of roll gap of sector section of slab caster |
| CN112756574B (en) * | 2020-11-27 | 2022-06-14 | 邯郸钢铁集团有限责任公司 | Slab continuous casting soft reduction control method under fault condition of displacement sensor |
| CN113804482B (en) * | 2021-09-15 | 2023-07-25 | 芜湖新兴铸管有限责任公司 | Method for rapidly detecting solidification end position of continuous casting billet |
| CN114589295B (en) * | 2022-03-08 | 2024-02-27 | 宝钢湛江钢铁有限公司 | Roller gap adjusting method for casting machine for abnormal final casting of slab continuous casting |
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