CN101890488A - Method for determining position of solidified tail end of liquid core of continuous casting billet - Google Patents
Method for determining position of solidified tail end of liquid core of continuous casting billet Download PDFInfo
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- CN101890488A CN101890488A CN2009100517337A CN200910051733A CN101890488A CN 101890488 A CN101890488 A CN 101890488A CN 2009100517337 A CN2009100517337 A CN 2009100517337A CN 200910051733 A CN200910051733 A CN 200910051733A CN 101890488 A CN101890488 A CN 101890488A
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Abstract
The invention discloses a method for determining the position of the solidified tail end of a liquid core of a continuous casting billet, which comprises the following steps: step 1: arranging a force transducer at the connecting part of a grip cylinder and a fan-shaped section frame of a continuous casting machine, and measuring the pressure of the inlet and the outlet of each fan-shaped section frame in the continuous casting process; step 2: transferring the pressure values of the inlet and the outlet of each fan-shaped section frame measured in the step 1 into a computer data processing system to be processed, and outputting the change conditions of the pressure of the inlet and the outlet of each fan-shaped section frame through a display output system; and step 3: comparing the sudden change conditions of the pressure of the inlet and outlet of each fan-shaped section frame when the casting speed changes, and then, determining the position of the solidified tail end of the liquid core. The method for determining the position of the solidified tail end of the liquid core of the continuous casting billet is accurate, direct and fast.
Description
Technical field
The present invention relates to the continuous casting field of steel, solidified tail end of liquid core of continuous casting billet location determining method during particularly a kind of continuous casting of slab.
Background technology
In continuous casting technology, molten steel is subjected to cooling and forms certain thickness solidified shell in crystallizer inside, gone out crystallizer after, strand inside also is in liquid state, forms a long liquid core.In ensuing two cold stages, strand is subjected to secondary cooling, and solidified shell is thickening gradually, solidifies fully up to the strand core, and casting process is the strand liquid core process of progressively solidifying just.Therefore continuous casting installation for casting design and definite one of the topmost foundation of designing and calculating stage in early stage that waits of casting parameters are not only in the solidified tail end of liquid core of continuous casting billet position, also be in the actual production process simultaneously, as continuous casting control, capacity of equipment examination, casting blank inner organization structure and quality control and even one of the aspect major parameters such as reasonable system of new steel grade technological specification of casting.
The comprehensive function of multiple factor is depended in the position of solidified tail end of liquid core of continuous casting billet in the actual production, and the factor that has the greatest impact is the size of casting speed and strand size.In addition, steel grades, casting blank section shape, casting molten steel overheat, strand are in the type of cooling, casting blank shell and crystallizer inwall and the roller row contact area and the material material thereof etc. of crystallizer and secondary cooling zone, and also the accurate position to the continuous casting billet solidification end has than significant effects.Especially it is more urgent to the accurate mensuration of strand solidified tail end of liquid core that the strand end is gently depressed the employing of technology.
For a long time, main iron and steel enterprise both domestic and external, scientific workers such as correlative study institutes and colleges and universities determine that accurately the solidified tail end of liquid core of continuous casting billet position all carried out a large amount of research and discoveries in theory with in the reality to how, have developed various theoretical calculation models or actual measurement method.Aspect the theory analysis, according to the square root law
, various borders and primary condition in the casting machine all be reacted to solidify in the constant K, estimate casting blank solidification end according to shell thickness δ and time t.Technical development of computer is rapid in recent years, and various simulations and computational methods occur, and utilizes the simulation of finite difference and finite element algorithm to obtain the casting blank solidification end position.Square root law and numerical computations are to obtain on the basis that the strand diabatic process is supposed, and practical application also will debug according to concrete casting machine equipment, steel grade and pouring condition, have very big uncertainty.Experiment determines that rule comprises the puncture of base shell, tagging, nailing and bulge mensuration etc., and these experimental techniques all are destructive tests, can only be as the less research of sample size, and be not suitable for industrial production.
Chinese patent CN1909995A discloses the method for solidified tail end of liquid core position in a kind of definite continuous casting billet, by ergometry signal on fixed or adjustable type backing roll, measure indirectly regulating technological parameter in conjunction with displacement signal, measure the heart portion liquid volume of each long measure or whole strand length indirectly with this, and finish the model calculating of solidification end current location according to these measured values.This method is earlier by measurement result debugging computation model, and the parameter of model own need also have very big uncertainty and indirect property according to the measurement data correction.
Summary of the invention
For addressing the above problem, the invention provides a kind of solidified tail end of liquid core of continuous casting billet location determining method, can be directly, determine the position of solidified tail end of liquid core exactly, for solidification end is gently depressed technology and the checking of continuous casting and solidifying heat transfer model provides accurate information.
For achieving the above object, solidified tail end of liquid core of continuous casting billet location determining method of the present invention, may further comprise the steps: step 1, force cell is set, measures the pressure of the entrance and exit of each sector-segment frames in casting process in the junction of continuous casting machine fan-shaped segment frames and clamping cylinder; Step 2, the force value that previous step is measured the entrance and exit of each sector-segment frames in rapid are sent into computer data processing system and are handled, again by showing that output system exports the situation of change of each sector-segment frames entrance and exit pressure; Step 3, the situation of undergoing mutation of each sector-segment frames entrance and exit pressure compares when changing according to pulling rate, determines the residing position of solidified tail end of liquid core.
Preferably, solidified tail end of liquid core of continuous casting billet location determining method of the present invention, in that step 1 is described when force cell is set, judge the regional extent of the residing sector-segment frames of strand solidified tail end of liquid core under the work pulling rate earlier by the casting blank solidification coefficient, at the sector-segment frames of this regional extent and the junction of clamping cylinder force cell is set again.
Preferably, export the situation of change of each sector-segment frames entrance and exit pressure in the described step 2 by the demonstration output system, adopt form to list all change value of pressure.
Preferably, export the situation of change of each sector-segment frames entrance and exit pressure in the described step 2 by the demonstration output system, when adopting pulling rate to change, the form of the time dependent curve of each sector-segment frames entrance and exit pressure shows.
Solidified tail end of liquid core of continuous casting billet location determining method of the present invention, the situation of change that reflects molten steel static pressure by pressure at each sector-segment frames entrance and exit, determine the position of strand solidified tail end of liquid core in conjunction with the change of pulling rate in the casting process, have accurately, directly, advantage fast.
Description of drawings
Fig. 1 is the schematic diagram of solidified tail end of liquid core of continuous casting billet position determination system,
Fig. 2 is the schematic perspective view of one of them sector-segment frames among Fig. 1,
Fig. 3 is each framework inlet outlet pressure changing trend diagram when casting speed changes in the casting process.
The specific embodiment
Fig. 1 is the schematic diagram of solidified tail end of liquid core of continuous casting billet position determination system, and molten steel is discharged into the tundish 12 from ladle 11, and molten steel flows into the crystallizer 13 from tundish 12.Come out from crystallizer 13, the continuous casting billet 100 of casting passes continuous casting machine fan-shaped segment and carries out the secondary cooling.Continuous casting machine fan-shaped segment mainly plays and send dress dummy bar, rest, cooling, straightening slab, reduces the bulge strain of base shell two phase boundary place ferrostatic pressures and the effect of aligning strain.Continuous casting machine fan-shaped segment is made up of vertical section, segmental arc and horizontal segment respectively.As shown in the figure, vertical section is vertical section backing roll 14 parts shown in the figure, horizontally disposed four sector-segment frames 15 are horizontal segment, six sector-segment frames 15 between horizontal segment and vertical section are segmental arc, from vertical section backing roll 14, vertical section backing roll 14 is No. 0 section, six sector-segment frames 15 of segmental arc thereafter are followed successively by segment frames 15a No. 1, No. 2 segment frames 15b, No. 3 segment frames 15c, No. 4 segment frames 15d, No. 5 segment frames 15e, No. 6 segment frames 15f, four sector-segment frames 15 of horizontal segment are followed successively by segment frames 15g No. 7, No. 8 segment frames 15h, No. 9 segment frames 15i, No. 10 segment frames 15j.
Because the existence of liquid core 110, the physical property of continuous casting billet 100 changes, and the elastoplasticity aspect of performance of a continuous casting billet that solidifies fully and a local solidification continuous casting billet is distinguishing, and the transmission of its power also is different.Depress in the process at fan-shaped section hydraulic cylinder 151, the external force that is subjected to liquid core 110 under 100 wide of the continuous casting billets takes place to flow, the suffered external force of base shell is delivered to liquid core 110 parts, so molten steel static pressure, hydraulic cylinder 151 clamping forces and sector-segment frames 15 have a balance between being stressed.When the casting machine pulling rate is undergone mutation, the heat transfer situation of continuous casting billet 100 also can change, the setting time of continuous casting billet 100 changes, continuous casting billet 100 solidified tail end of liquid core 111 positions also change thereupon, the ferrostatic pressure of solidified tail end of liquid core 111 residing fan-shaped section positions also can change, therefore as long as obtain the stressed situation of change of each fan-shaped section, just can judge solidified tail end of liquid core 111 positions.
The principle of the invention is: continuous casting machine fan-shaped segment frames 15 stressing conditions are decided by the reaction force of the niproll of 100 pairs of sector-segment frames 15 of continuous casting billet, and the reaction force of 100 pairs of niprolls of continuous casting billet mainly is continuous casting billet 100 molten steel static pressures, that is to say the size and the variation of the niproll reaction force of 100 pairs of sector-segment frames 15 of continuous casting billet, just reflect the size and the variation of continuous casting billet 100 molten steel static pressures.One of them sector-segment frames 15 is being analyzed, and molten steel static pressure can be expressed as:
P
Liquid＝P
Clamp-P
Frame
In the formula:
P
FrameThe pressure that-sector-segment frames 15 is subjected to
P
ClampThe clamping force of-clamping cylinder 151
P
Liquid-molten steel static pressure is to the reaction force of sector-segment frames 15
In the stable casting cycle of conticaster, fan-shaped section clamping cylinder 151 clamping force P
ClampSubstantially remain unchanged, and molten steel static pressure is to the reaction force P of sector-segment frames 15
LiquidThen change, just caused P along with the variation of continuous casting billet 100 shell thicknesses
FrameVariation.
Sector-segment frames 15 pressure P
FrameVariation directly reflected the variation of the inner molten steel static pressure of this fan-shaped section strand.The inlet of each framework by measuring fan-shaped section, the pressure P of outlet
Frame, change according to pressure, just can judge the position of solidified tail end of liquid core 111.
Therefore, can force cell be set in inlet, the outlet of each framework of fan-shaped section, each point pressure changes independent record, with the inlet of each framework, the pressure P of outlet
FrameSignal handle.As described in Figure 1, the pressure P of the inlet of each framework, outlet
FrameSignal carry out filtering and amplification by signal amplifying system 201, and convert the signal that meets the computer requirement to by A/D converting system 202, handle by 203 pairs of data of computer data processing system then, at last by showing output system 204 outputs.
Fig. 2 is the schematic perspective view of one of them sector-segment frames among Fig. 1, as shown in the figure, the inlet of framework 15, outlet are provided with the junction that force cell 151 is arranged on clamping cylinder 151 and framework 15, force cell 151 is finished the pressure of each framework 15 of fan-shaped section in casting process, the independent record of entrance and exit pressure.
The present invention can judge the regional extent of strand solidified tail end of liquid core 111 under the work pulling rate by the casting blank solidification COEFFICIENT K earlier.The square root law of casting blank solidification is:
In the formula,
δ is shell thickness (mm)
K is the casting blank solidification coefficient, the empirical (mm/min of this value for obtaining by the nailing test
1/2)
L is the distance (m) of solidified tail end of liquid core to mold liquid level
V is casting speed (m/min)
Half that utilize slab thickness is shell thickness δ, can try to achieve solidified tail end of liquid core position l general area under the casting machine different operating pulling rate v by this formula, be which sector-segment frames solidified tail end of liquid core 111 drops in, force cell 151 be installed in these several fan-shaped section got final product.Can save the quantity of force cell like this, also can reduce the workload that the data data are handled simultaneously, be convenient to data analysis.Piston rod line position at fan-shaped section clamping cylinder 15 is concrete measurement point, determines in the junction of piston rod and framework 15 force cell 152 to be installed.When the casting machine pulling rate changes, change has also taken place in the heat transfer situation of continuous casting billet 100, solidified tail end of liquid core 111 also changes thereupon, change has also taken place in solidified tail end of liquid core 111 residing fan-shaped section zones, measure the variation of conticaster part fan-shaped section pressure by on-line continuous, just directly reflected the variation of strand molten steel static pressure, and molten steel static pressure to be thickness and length with strand liquid core have direct relation, therefore just can contrast situation and then judge the position of its solidified tail end of liquid core 111 according to the variation of the variation of pulling rate and each sector-segment frames gateway pressure.
203 pairs of data of data handling system are handled, and by showing output system 204 outputs, its way of output can adopt the form of tables of data to show, also can be by the casting speed form demonstration of trend curve over time.
By the contrast of change trend curve or tables of data, when relatively pulling rate changes, the variation of the pressure at different sector-segment frames 15 entrance and exit places.When pulling rate increases, the solidified shell attenuation gradually in the different fan-shaped section.Because thereby the change of thickness of solidified slab shell in secondary has changed the active force of molten steel static pressure herein to framework, thereby be reflected to force cell 152.When solidified tail end of liquid core 111 enters into certain fan-shaped section zone, its liquid core static pressure can change, especially change liquid state into by original curdled appearance, the significant change takes place in its static pressure because the existence of liquid core has been arranged, and this change also just is reacted directly on the force cell 152.Therefore utilize the relation between sector-segment frames pressure, oil cylinder clamping force and the molten steel static pressure, just can judge strand solidified tail end of liquid core position more exactly.
Be example with 1550mm * 230mm section casting blank below, steel grade is that Q235 specifies how to determine the solidified tail end of liquid core position.Coagulation factor K=27mm/min according to square root law and this steel grade
1/2, the pulling rate of then working is in the scope of 0.85m/min～1.0m/min, the solidified tail end of liquid core position is approximately 15.42m to about the 18.14m.The distance that No. 6 segment frames 15f inlet of casting machine and the 8th segment frames 15h export to mold liquid level is respectively 14.344m and 20.176m, can judge that then this casting machine solidified tail end of liquid core 111 approximately is in No. 6 segment frames 15f and the 8th segment frames 15h, therefore installs force cell 152 respectively on the 6th, 7 and 8 segment frames 15f, 15g, 15h.
When adopting casting speed (abbreviation pulling rate) to change, each framework inlet outlet pressure changes when the form of trend curve shows over time, can adopt curve shown in Figure 3 to represent mode, Fig. 3 is each framework inlet outlet pressure changing trend diagram when casting speed changes in the casting process.As shown in Figure 3, curve A represents that No. 6 segment frames 15f inlet pressure values, curve B represent that No. 6 segment frames 15f outlet pressure values, curve C represent segment frames 15g inlet pressure value No. 7 among the figure, and curve D is represented the casting speed value.When pulling rate when 0.8m/min increases to 0.85m/min, the solidified tail end of liquid core position increases, then No. 6 segment frames 15f outlet pressures and No. 7 segment frames 15g inlet pressures are undergone mutation, pressure reduces significantly, and No. 6 segment frames 15f inlet pressure values slightly reduce, and No. 7 segment frames 15g export values do not change, can judge when pulling rate is 0.8m/min, solidified tail end of liquid core 111 is positioned at segment frames 15f No. 6, and is partial to segment frames 15f end, desirable 15.9m No. 6.
Data analysis also can be adopted form, and is as shown in table 1.The entrance and exit pressure that table 1 has been listed each sector-segment frames when pulling rate changes changes.When pulling rate continue to increase, when 0.85m/min changes to 0.9m/min, can judge that when pulling rate was 0.85m/min, solidified tail end of liquid core was in the deflection porch, middle part of No. 7 segment frames 15g, gets 16.8m according to the data in the table 1.Give pulling rate in the table 1 and continue to increase the analogue that occurs, the estimate of situation of solidified tail end of liquid core saw Table 1 when other pulling rates changed, and described no longer one by one here.
When changing by pulling rate, the solidified tail end of liquid core position under the different casting can be determined in the residing position of pressure jump.
Table 1
Claims (4)
1. a solidified tail end of liquid core of continuous casting billet location determining method is characterized in that, may further comprise the steps:
Step 1, force cell is set, measures the force value of the entrance and exit of each sector-segment frames in casting process in the junction of continuous casting machine fan-shaped segment frames and clamping cylinder;
The force value of the entrance and exit of step 2, each sector-segment frames that previous step is measured in rapid is sent into computer data processing system and is handled, again by showing that output system exports the situation of change of each sector-segment frames entrance and exit pressure;
Step 3, the situation of undergoing mutation of each sector-segment frames entrance and exit pressure compares when changing according to pulling rate, determines the residing position of solidified tail end of liquid core.
2. solidified tail end of liquid core of continuous casting billet location determining method as claimed in claim 1, it is characterized in that, in that step 1 is described when force cell is set, judge the regional extent of the residing sector-segment frames of strand solidified tail end of liquid core under the work pulling rate earlier by the casting blank solidification coefficient, at the sector-segment frames of this regional extent and the junction of clamping cylinder force cell is set again.
3. solidified tail end of liquid core of continuous casting billet location determining method as claimed in claim 1, it is characterized in that, export the situation of change of each sector-segment frames entrance and exit pressure in the described step 2 by the demonstration output system, adopt form to list all change value of pressure.
4. solidified tail end of liquid core of continuous casting billet location determining method as claimed in claim 1, it is characterized in that, export the situation of change of each sector-segment frames entrance and exit pressure in the described step 2 by the demonstration output system, when adopting pulling rate to change, the form of the time dependent curve of each sector-segment frames entrance and exit pressure shows.
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| CN101912952A (en) * | 2010-08-27 | 2010-12-15 | 田陆 | Control method under dynamic soft reduction and determining method of solidified tail end and reduction interval |
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| CN104001891B (en) * | 2014-06-17 | 2016-08-31 | 中冶连铸技术工程有限责任公司 | On-Line Control Method under a kind of continuous small-billet casting dynamic soft-reduction and weight |
| WO2020042924A1 (en) * | 2018-08-31 | 2020-03-05 | 宝山钢铁股份有限公司 | Light reduction method for continuous casting of bloom plain-barrelled roll-roller combination |
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Open date: 20101124 |