CN101920323A - 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, belong to metallurgical continuous casting control technology field based on pressure feedback detection tail end of solidified liquid core of casting blank.
Background technology:
In continuous casting production process, the high-temperature liquid state molten steel is continuous casting and solidifying in the equipment of being made up of crystallizer and fan-shaped section, forms the strand that has certain thickness liquid core, and the liquid core cools off continuously and solidifies, and finally forms the solid slab.Because solidification shrinkage has taken place in molten steel in the 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 the liquid core of solidification end shrinks and can not effectively compensate, can form internal flaws such as segregation, loose, shrinkage cavity and crackle in the strand centre; This defective may form defectives such as layering in the follow-up operation of rolling, board quality and performance are had material impact, even it is useless to cause sheet material directly to be declared.The roll gap system designing that in casting process, strand molten steel Solid State Contraction is compensated, and utilize segment roll gap that the liquid core of solidification end is carried out certain contraction of depressing, be called the technology of gently depressing.The technology of gently depressing is divided into passive light to be depressed and dynamically gently depresses, and the roll gap contraction system that passive light is depressed to formulating is changeless, and amount of contraction can not be changed in casting process; The roll gap contraction system of dynamically gently depressing then is dynamic change, according to the casting process changes in process parameters, dynamically adjusts the amount of contraction and the punctured position of segment roll gap.
Dynamically gently depress the core technology that technology is high-end slab product continuous casting,, the solidification end of base shell is carried out feeding by dynamic adjustment depressing position and drafts.The good technology of dynamically gently depressing can accurately track the solidification end of strand, can improve the strand internal soundness after the enforcement, reduces 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 because in the continuous casting production process, 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, then be difficult to improve slab quality, even can worsen slab quality and cause the accident.
Conventional dynamic is gently depressed technology and is determined that the method for casting blank solidification end is: Mathematical Modeling is set up in heat transfer in the 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, forecast solidification end position implements to shrink bigger drafts than common roll gap in this position then.The shortcoming of this technology is: because the terminal position of solidification liquid core is the theoretical gained that calculates, very big with the quality relation of calculating used model, computational methods are also complicated, and computing time is long; And shortage directly detects foundation and checking is difficult.Actual production process is the more complicated because influence factor is many then, 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 provides a kind of dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank, improves the strand internal soundness, reduces quality problems such as loose and segregation, solves the problems referred to above that exist in the 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: at first set up the self-regulating control platform of the long-range roll gap of each fan-shaped section in the tail end of solidified liquid core of casting blank position on conticaster for accurately judging; Utilize the pressure sensor testing result that is installed on each fan-shaped section then, calculate strand at different fan-shaped section zone pressure; 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; Judge liquid core terminal position according to this method at last, utilize light depress control system dynamically to take different drafts in each fan-shaped section of casting machine.
Step more specifically:
1. on the hydraulic cylinder of each fan-shaped section of casting machine, distinguish setting pressure sensor and displacement transducer, 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, gather pressure sensor and displacement transducer show value in real time, 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 sensor testing result and analyze the stressed mechanical model of 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 dynamically gently to depress to water the punching block formula under the state of a control continuously.
Of the present inventionly dynamically gently depress technology and conventional dynamic gently to depress technology different, it judges that the method for strand solidified tail end of liquid core is not to adopt model to calculate and forecast, but utilize the pressure sensor that is installed 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, judge the position of tail end of solidified liquid core; The liquid core terminal position of judging according to this method is dynamically taked different drafts in each fan-shaped section then, improves the strand internal soundness, reduces quality problems such as loose and segregation, strand segregation and loose can 95% being controlled in the C class 1.5.
The present invention's main feature compared with prior art of the present invention has:
1. gently to depress technology different with conventional dynamic, and it judges that the method for strand solidified tail end of liquid core is not to adopt model to calculate and forecast, directly obtain but utilize the real-time stress of strand to calculate the back, 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 dynamically gently to depress the key that technology is improved slab quality;
2. because this method does not need a large amount of calculated with mathematical model casting blank surface temperature and shell thickness, its algorithm of judging liquid core position is simply effective, can save computer resource, guarantees the stability of 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. on the hydraulic cylinder of each fan-shaped section of casting machine, distinguish setting pressure sensor and displacement transducer, 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, gather pressure sensor and displacement transducer show value in real time, 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 sensor testing result and analyze the stressed mechanical model of strand, detect strand solidified tail end of liquid core position according to the strand pressure;
The position of detecting casting blank solidification end comes down to how to distinguish the position that contains the liquid core and do not contain the strand place fan-shaped section of liquid core, according to contain 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 then in the 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 bigger; Its slope of a curve scope is between 0.3-0.8, and strand pressure fluctuation amplitude is at 0-15t; Lifting then in the enforcement, pressure changes opposite;
Normally pour into a mould the stage at casting machine, system per ten minutes carries out depressing and lifting of 0.3mm to the strand of each fan-shaped section successively, and the strand force difference in the more different fan-shaped section judges which fan-shaped section zone the position of strand solidified tail end of liquid core is in;
4. according to detecting strand solidified tail end of liquid core change in location, dynamically definite each fan-shaped section is depressed pattern, implements dynamically gently to depress to water the punching block formula under the state of a control continuously;
On step basis 3., according to analytical cycle, when judging that the strand solidified tail end of liquid core is n fan-shaped section, then to n-1, n and n+1 fan-shaped section take to shrink 1.5mm respectively, 1.5mm, other fan-shaped section is then implemented to shrink 0.3mm drafts control model with 0.8mm 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 dynamically gently depressing, detect that strand pressure size is at 50t in No. 5 fan-shaped section, 0.3mm is lifted and pressed down to fluctuation amplitude at 2-14t on the roll gap, and the slope range of strand feedback pressure change curve is between 0.40-0.75; Strand pressure size is 68 in No. 6 fan-shaped section, 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, judge that the strand solidified tail end of liquid core is in No. 6 fan-shaped section.Gently depress and water the steel control model and be: 1-4 segment roll gap amount of contraction control target is 0.3mm, the 5th, 6, No. 7 segment roll gap amount of contraction control target is respectively 1.5mm, 1.5mm and 0.8mm, 8-10 segment roll gap amount of contraction control target is 0.3mm.In the 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.The 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 dynamically gently depressing, detect that strand pressure size is at 60t in No. 6 fan-shaped section, 0.3mm is lifted and pressed down to fluctuation amplitude at 2-15t on the roll gap, and the slope range of strand feedback pressure change curve is between 0.45-0.70; Strand pressure size is 75 in No. 7 fan-shaped section, and fluctuation amplitude is at 0-5t, and the slope range of change curve is between 0.85-1.00.Strand pressure size is at 80t in No. 8 fan-shaped section, and fluctuation amplitude is at 0-5.5t, and the slope range of change curve is between 0.9-1.0.Therefore, judge that the strand solidified tail end of liquid core is in No. 7 fan-shaped section.Gently depress and water the steel control model and be: 1-5 segment roll gap amount of contraction control target is 0.3mm, the 6th, 7, No. 8 segment roll gap amount of contraction control target is respectively 1.5mm, 1.5mm and 0.8mm, the 9th, No. 10 segment roll gap amount of contraction control target is 0.3mm.In the 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.The 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 dynamically gently depressing, detect that strand pressure size is at 75t in No. 7 fan-shaped section, 0.3mm is lifted and pressed down to fluctuation amplitude at 1-14t on the roll gap, and the slope range of strand feedback pressure change curve is between 0.40-0.60; Strand pressure size is 70 in No. 8 fan-shaped section, and fluctuation amplitude is at 0-7t, and the slope range of change curve is between 0.80-0.90.Strand pressure size is at 77t in No. 9 fan-shaped section, and fluctuation amplitude is at 0-4.5t, and the slope range of change curve is between 0.85-1.00.Therefore, judge that the strand solidified tail end of liquid core is in No. 8 fan-shaped section.Gently depress and water the steel control model and be: 1-6 segment roll gap amount of contraction control target is 0.3mm, and the 7th, 8, No. 9 segment roll gap amounts of contraction control target is respectively 1.5mm, 1.5mm and 0.8mm, and No. 10 segment roll gap amount of contraction control target is 0.3mm.In the 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.The 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 (5)
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: at first on conticaster, set up the self-regulating control platform of the long-range roll gap of each fan-shaped section in the tail end of solidified liquid core of casting blank position for accurately judging; Utilize the pressure sensor testing result that is installed on each fan-shaped section then, calculate strand at different fan-shaped section zone pressure; 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; Judge liquid core terminal position according to this method at last, utilize light depress control system dynamically to take different drafts in each fan-shaped section of casting machine.
2. the dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank according to claim 1 is characterized in that step more specifically:
1. on the hydraulic cylinder of each fan-shaped section of casting machine, distinguish setting pressure sensor and displacement transducer, 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, gather pressure sensor and displacement transducer show value in real time, 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 sensor testing result and analyze the stressed mechanical model of 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 dynamically gently to depress to water the punching block formula under the state of a control continuously.
3. the dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank according to claim 2, the position that it is characterized in that detecting casting blank solidification end is 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, how distinguishing the position of the strand place fan-shaped section that contains the liquid core and do not contain the liquid core.
4. the dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank according to claim 3, it is characterized in that casting machine normally pours into a mould the stage, system per ten minutes carries out depressing and lifting of 0.3mm to the strand of each fan-shaped section successively, strand force difference in the more different fan-shaped section judges which fan-shaped section zone the position of strand solidified tail end of liquid core is in.
5. the dynamic soft reduction method based on pressure feedback detection tail end of solidified liquid core of casting blank according to claim 3, it is characterized in that when judging that the strand solidified tail end of liquid core is n fan-shaped section, then to n-1, n and n+1 fan-shaped section take to shrink 1.5mm respectively, 1.5mm, other fan-shaped section is then implemented to shrink 0.3mm drafts control model with 0.8mm drafts control model.
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| CN106345979A (en) * | 2016-08-30 | 2017-01-25 | 中国重型机械研究院股份公司 | Device and method for detecting and determining casting blank solidification end positions on basis of guide roller load |
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| CN108213371A (en) * | 2018-01-02 | 2018-06-29 | 邯郸钢铁集团有限责任公司 | A kind of method of the dynamic adjustment red base pressure of slab caster |
| CN108380837A (en) * | 2018-01-31 | 2018-08-10 | 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 |
| 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 |
| WO2020181575A1 (en) * | 2019-03-12 | 2020-09-17 | 东北大学 | Prediction method for behavior of bloom continuous casting reduction segregation using convex roller |
| CN111687388A (en) * | 2020-06-28 | 2020-09-22 | 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 |
| 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 |
| CN112756574A (en) * | 2020-11-27 | 2021-05-07 | 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 |
| 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 |
| CN113804482A (en) * | 2021-09-15 | 2021-12-17 | 芜湖新兴铸管有限责任公司 | Method for rapidly detecting solidification tail end position of continuous casting billet |
| 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 |
| CN114589295A (en) * | 2022-03-08 | 2022-06-07 | 宝钢湛江钢铁有限公司 | Roll gap adjusting method for casting machine for abnormal final casting of slab continuous casting |
| 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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