CN105478704A - System for preventing continuous casting corner crack defect of micro-alloy steel casting blank and application method thereof - Google Patents
System for preventing continuous casting corner crack defect of micro-alloy steel casting blank and application method thereof Download PDFInfo
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- CN105478704A CN105478704A CN201610000423.2A CN201610000423A CN105478704A CN 105478704 A CN105478704 A CN 105478704A CN 201610000423 A CN201610000423 A CN 201610000423A CN 105478704 A CN105478704 A CN 105478704A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
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Abstract
The invention discloses a system for preventing a continuous casting corner crack defect of a micro-alloy steel casting blank and an application method thereof. On the basis of improving the structure of a traditional secondary cooling spraying cooling device, a secondary cooling water spraying frame lifting device, a secondary cooling water flow adjusting device and a process control system are built, so that dynamic control of secondary cooling water cooling area and automatic adjustment of secondary cooling water flow changed along with the cooling area are realized, the generation of transverse cracks caused by direct spraying of an inner arc corner of the casting blank by secondary cooling water and the change of inner arc surface temperature of the casting blank caused by change of cooling strength are prevented, no change of cooling strength of the inner arc surface of the casting blank is guaranteed, the difficulty of transverse corner crack defect of the micro-alloy steel casting blank existing in continuous casting production process for a long time is solved, an important effect on quality improvement of the micro-alloy steel casting blank is achieved, and the system is prominent in economic benefit and higher promotion and application value in industry.
Description
Technical field
The invention provides and a kind ofly in micro alloyed steel strand continuous casting production process, prevent the system of transverse corner crack defect and the using method of this system, belong to continuous casting installation for casting technical field.
Background technology
Micro alloyed steel refers to the steel that with the addition of trace alloying element in common mild steel and rolled products of ordinary high-strength low alloy steel substrate chemical composition, usually, the addition no more than 0.20% of alloying element, after adding trace alloying element, can make steel mechanical performance index be improved significantly, but the occurrence probability of all kinds of defect of micro alloyed steel casting billet surface is also far away higher than the strand of other steel grade, and this wherein just comprises transverse corner crack simultaneously; Transverse corner crack defect can roll edges of boards portion and developing into the edge fault on similar rotten limit after rolling process, thus has a strong impact on the final mass of plate product.The carbide of microalloy element in casting blank surface temperature and steel in the generation of micro alloyed steel strand transverse corner crack and production process, the precipitation of carbonitride under this temperature range is closely related, usually, between setting temperature ~ 600 DEG C, there are three brittle temperature zone in steel, that is: the Ith brittle temperature zone near setting temperature, the IIth brittle temperature zone near 1200 DEG C and 950 DEG C ~ 700 DEG C interval the IIIth brittle temperature zone, in these temperature ranges, the toughness that steel shows is poor, under the effect of the larger pulling force in the external world, the matrix of steel is just easy to that fracture occurs and cracks, research shows, the IIIth brittle temperature zone and the casting billet surface transversal crack relation of steel are particularly close, this is because: after strand enters the aligning region of conticaster, by fan-shaped section smoothing roll, the straightening force that strand applies is affected, larger action of pulling stress can be born in the inner arc position of strand, cause the surface metal of its inner arc position that larger plastic deformation occurs, when the stress that surface metal bears exceedes the plastic stress limit that it can bear, will rupture along metallic grain boundaries, in addition, the nitride that in the microalloy elements such as Nb, V, Ti, Al in micro alloyed steel and steel, C, N element generate, carbonitride can the minuteness particle form with nano-grade size in the IIIth brittle temperature zone be separated out, and these particles can be attached to grain boundaries, and crystal boundary is damaged, thus on steel prolong plasticity can impact will be more remarkable, for these reasons, there is strict requirement at continuous casting scene to the temperature range of micro alloyed steel casting billet surface, require that the surface temperature of strand in continuous casting aligning district is greater than 900 DEG C, but also consider when casting blank surface temperature is higher than 950 DEG C simultaneously, the defect that austenite crystal can be caused thick to strand, thus causing the undesirable problem of the mechanical property of final plate product, the surface temperature control of strand in continuous casting aligning district is within the scope of 900 DEG C ~ 950 DEG C the most at last.
Production scene control strand the main path that secondary cooling zone lower the temperature be spray gun by being fixed on spraying rack on the upper and lower framework of fan-shaped section simultaneously to two wide up and down of strand, i.e. intrados and extrados sprinkling cooling water, thus realize the cooling of strand, in temperature-fall period, the cooling rate of the diverse location of casting billet surface is different, and this is mainly reflected in the corner positions of strand and common wide position, it has been generally acknowledged that, by the impact of casting blank cross-section size, the strand usually radiating mode of wide is one dimension heat radiation, heat outwardly spreads along the normal direction of strand inner arcuate surface, therefore the cooling rate in this region is lower, and the radiating mode of strand corner positions is two dimension heat radiation, heat outwardly spreads along wide adjacent with strand bight and leptoprosopy simultaneously, therefore the cooling rate in this region will much larger than the cooling rate of the usual inner arcuate surface of strand, thus cause the strand bight temperature in continuous casting aligning district easier lower than 900 DEG C, cause the generation of a large amount of strand transverse corner crack, in addition, in the process of spraying cooling water, the impact of gravitate, the cooling water intensity of spray irrigation that strand extrados bears will be weaker than the cooling water intensity of spray irrigation that intrados bears, this just causes strand transverse corner crack defect mainly to concentrate on inner arc position, and the emphasis therefore solving micro alloyed steel strand transverse corner crack defect is the generation of the transverse corner crack defect effectively avoiding its inner arc.
The method solving micro alloyed steel strand transverse corner crack defect in prior art mainly contains following several:
(1), by effectively controlling the method for N content in steel in smelting link, thus control the nitride of microalloy element, the amount of precipitation of carbonitride in steel, solve the defect problem of the transverse corner crack of strand; Although this method can reduce the probability that strand transverse corner crack defect occurs, simultaneously can along with the following problem of generation:
1., the complexity of smelting process can be increased, and then increase steel making working procedure cost;
2., micro alloyed steel product mainly relies on the nitride of microalloy element in steel, " pinning " effect of Carbonitride Precipitation particle, control the crystallite dimension in steel, realize the lifting of product mechanical property, the mechanical property of the final products that therefore too low in steel N content can have influence on.
(2), by carrying out " corner cut " process to the strand under normal temperature, by strand inner arc bight along the entirety excision of throwing direction, thus the defect problem of strand transverse corner crack is solved; This method can effectively avoid strand transverse corner crack defect to be brought into steel rolling process link, thus defect of guaranteeing that final products there will not be " rotten limit ", win the satisfaction of user, but shortcoming is that productive labor intensity is large, a large amount of metal wastes can be caused simultaneously, affect production cost.
(3), the method for the spray gun spray nozzle above strand inner arc bight is positioned at by fan-shaped section near artificial blocking continuous casting aligning district, cooling water is avoided to be directly injected to strand inner arc bight, thus reduce the intensity of cooling in strand inner arc bight, guarantee that this position temperature is within the scope of 900 DEG C ~ 950 DEG C; Although this method can reduce the occurrence probability of strand transverse corner crack, promote the qualification rate of cc billet surface quality, the shortcoming of the method is also fairly obvious:
1., under the prerequisite of identical continuous casting process condition, due to the difference of steel grade chemical analysis, cause the variations in temperature in strand bight to there is larger difference, production scene needs to do plugging handling to the shower nozzle of fan-shaped section diverse location in advance for different steel grades; Therefore, the adaptability of this method to steel grade is poor;
2., implement the method there is the large problem of productive labor intensity equally, be unfavorable for large-scale popularization.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of system and the using method thereof that prevent micro alloyed steel strand continuous casting chink defect, by increasing secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator and Process Control System, realize not changing on the cooling water inflow basis in lance ejection angle and casting billet surface central area unit are, the strand adjacent corner region Water spray that is cooled is avoided to arrive, guarantee that the strand inner arc bight temperature stabilization aligned in region controls within the scope of 900 DEG C ~ 950 DEG C, effectively avoid the generation of strand inner arc transverse corner crack defect.
The technical scheme solved the problems of the technologies described above is:
Prevent the system of micro alloyed steel strand continuous casting chink defect, comprise secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator and Process Control System, described secondary cooling water spraying rack lowering or hoisting gear is made up of pneumatic cylinder 1, piston 2 and piston rod 3, piston rod 3 upper end is connected with piston 2, piston 2 is assemblied in pneumatic cylinder 1 and pneumatic cylinder is divided into epicoele and cavity of resorption, epicoele sidewall is connected with epicoele air inlet pipe 4 and epicoele escape pipe 5 respectively, epicoele air inlet pipe 4 is installed epicoele solenoid valve 6, epicoele escape pipe 5 is installed epicoele electromagnetic switch valve 7; Cavity of resorption sidewall is connected with cavity of resorption air inlet pipe 8 and cavity of resorption escape pipe 9 respectively, cavity of resorption air inlet pipe 8 is installed cavity of resorption solenoid valve 10, cavity of resorption escape pipe 9 is installed cavity of resorption electromagnetic switch valve 11; Epicoele is provided with upper cavity pressure sensor 12 and displacement transducer 13, and cavity of resorption is provided with cavity of resorption pressure sensor 14; Described secondary cooling water flow regulator is made up of the secondary cooling water flow electromagnetic control valve 15 be arranged on fan-shaped section secondary cooling water main line and secondary cooling water flow sensor 16; Described Process Control System by computer 17, be connected epicoele solenoid valve PLC18, the cavity of resorption solenoid valve PLC19, epicoele electromagnetic switch valve PLC20, cavity of resorption electromagnetic switch valve PLC21, pneumatic cylinder information feed back PLC22, secondary cooling water flow electromagnetic control valve PLC23, the secondary cooling water flow feedback PLC24 that carry out data communication respectively with computer 17 and form; Epicoele solenoid valve PLC18 is connected with epicoele solenoid valve 6, and cavity of resorption solenoid valve PLC19 is connected with cavity of resorption solenoid valve 10; Epicoele electromagnetic switch valve PLC20 is connected with epicoele electromagnetic switch valve 7, and cavity of resorption electromagnetic switch valve PLC21 is connected with cavity of resorption electromagnetic switch valve 11; Pneumatic cylinder information feed back PLC22 is connected with displacement transducer 13 with upper cavity pressure sensor 12, cavity of resorption pressure sensor 14 simultaneously, secondary cooling water flow electromagnetic control valve PLC23 is connected with secondary cooling water flow electromagnetic control valve 15, and secondary cooling water flow feedback PLC24 is connected with secondary cooling water flow sensor 16; Described secondary cooling water spraying rack lowering or hoisting gear is 4 covers, the lower end of its piston rod 3 respectively be installed on the upper surface of fan-shaped section underframe along 4 underframe supports 25 of the both sides, import and export position in throwing direction and be fixedly connected with; Secondary cooling water spraying rack 26 overlaps secondary cooling water spraying rack lowering or hoisting gear respectively pneumatic cylinder 1 sidewall with 4 is fixedly connected with.
The above-mentioned system preventing micro alloyed steel strand continuous casting chink defect, pneumatic cylinder 1 epicoele of described secondary cooling water spraying rack lowering or hoisting gear and cavity of resorption are also provided with epicoele overflow valve 27 and cavity of resorption overflow valve 28; Epicoele escape pipe 5 is provided with screen pack 29 with cavity of resorption escape pipe 9 away from the one end be connected with pneumatic cylinder 1.
The above-mentioned using method preventing the system of micro alloyed steel strand continuous casting chink defect, comprises the following steps:
Step 1: manual-lock epicoele solenoid valve, cavity of resorption solenoid valve, epicoele electromagnetic switch valve, cavity of resorption electromagnetic switch valve and secondary cooling water flow electromagnetic control valve;
Step 2: the mode of operation of computer is adjusted to " open and water front control " pattern, then, computer is according to the instruction of site operation people, and control secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator respectively, concrete operation step is:
(1), computer for controlling sends command signal to epicoele solenoid valve PLC, and open epicoele solenoid valve, now pressure-air enters pneumatic cylinder epicoele under the effect of ambient pressure; Meanwhile, send command signal to cavity of resorption electromagnetic switch valve PLC, open cavity of resorption electromagnetic switch valve, pneumatic cylinder moves up under the pressure of pressure-air, drives secondary cooling water spraying rack to be lifted to peak together; After displacement transducer feeds back peak positional information, epicoele solenoid valve and cavity of resorption electromagnetic switch valve are closed by computer for controlling, realize secondary cooling water spraying rack and leave standstill in highest order motionless with pneumatic cylinder;
(2), computer for controlling sends command signal to secondary cooling water flow electromagnetic control valve PLC, control secondary cooling water flow electromagnetic control valve by this PLC to open, now high pressure secondary cooling water sprays from each spray gun be arranged on spraying rack, secondary cooling water flow sensor can by secondary cooling water flow feedback PLC in real time to computer feedback secondary cooling water house steward data on flows, according to these data, command signal is sent to secondary cooling water flow electromagnetic control valve PLC in real time by computer, the aperture of adjustment secondary cooling water flow electromagnetic control valve, makes secondary cooling water flow meet production technology setting requirement;
(3), after the feedback result of secondary cooling water flow sensor and the cooling water flow of manufacturing technique requirent match, computer for controlling sends command signal to secondary cooling water flow electromagnetic control valve PLC, secondary cooling water flow electromagnetic control valve cuts out, then according to the spraying effect in step (2), the angle of inclination of each spray gun on manual fine-tuning secondary cooling water spraying rack, guarantee that the cooling water that on spraying rack, each row's spray gun sprays can be sprayed onto on the whole inner arc of strand completely, uniformly, realize the Homogeneous cooling of strand inner arcuate surface;
Step 3: the spray angle and the strand width parameter that input secondary cooling water spray gun in computer, be defined as dead-center position by current time secondary cooling water spraying rack position;
Step 4: after formally watering steel, is adjusted to " open and water rear control " pattern by the mode of operation of computer, in computer, manually input the vertical range along strand inner arc edge to inner arc center line
, inner arc edge is need not to be cooled the region that water sprays to the width regions of inner arc center line, and computer can according to its plug-in, first calculates the distance that the pneumatic cylinder that corresponds moves down
, that is:
In formula:
for for this steel grade, the vertical range along strand inner arc edge to inner arc center line of staff's setting, unit: m;
for pneumatic cylinder needs the distance that moves down, unit: m;
for the spray angle of secondary cooling water spray gun;
After calculating completes, computer can send instruction to cavity of resorption solenoid valve PLC, control cavity of resorption solenoid valve to open, now pressure-air enters pneumatic cylinder cavity of resorption under the effect of ambient pressure, meanwhile, computer sends command signal to epicoele electromagnetic switch valve PLC, opened by epicoele electromagnetic switch valve, now, pneumatic cylinder will move down, then the numerical value that feeds back for cycle monitoring displacement transducer with 10ms ~ 20ms of computer, when this numerical value equals
time, then computer can send instruction by downward chamber solenoid valve PLC and epicoele electromagnetic switch valve PLC simultaneously, cavity of resorption solenoid valve and epicoele electromagnetic switch valve is closed, guarantees that pneumatic cylinder is in this position transfixion;
Step 5: after the operation of completing steps 4, computer by its plug-in, is ensureing under the prerequisite that the cooling water inflow in strand inner arcuate surface unit are is constant, calculates the adjustment amount of secondary cooling water flow after pneumatic cylinder change in location
, that is:
In formula:
front set secondary cooling water flow is watered, unit: m for opening
3/ h;
for the secondary cooling water flow after the adjustment of spraying rack position, unit: m
3/ h;
for the width of strand, unit: m;
Then, computer sends instruction to secondary cooling water flow electromagnetic control valve PLC, the aperture of secondary cooling water flow electromagnetic control valve is turned down, and the numerical value simultaneously fed back for cycle Real-Time Monitoring secondary cooling water flow sensor with 10ms ~ 20ms, when this numerical value equals
time, computer then sends instruction to secondary cooling water flow electromagnetic control valve PLC, the aperture of secondary cooling water flow electromagnetic control valve is fixed, and guarantees that secondary cooling water flow no longer changes;
Step 6: watering after steel produces when completing, again performing step 1 by staff and operating, and according to the production schedule, preparing to carry out step 2 and operate.
The above-mentioned using method preventing the system of micro alloyed steel strand continuous casting chink defect, along strand inner arc edge to the vertical range of inner arc center line in described step 4
be for different microalloy steel grade Simulation on Temperature Field test draw; In described step 4, the spray angle scope of secondary cooling water spray gun is 110 ° ~ 120 °.
The invention has the beneficial effects as follows:
The present invention is on the basis of improving the structure of existing two cold water spray cooling devices, establish secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator and Process Control System, the Dynamic controlling and the secondary cooling water flow that achieve secondary cooling water film-cooled heat adjust automatically with the change of cooling zone area, avoid the change that strand inner arc bight causes because directly being sprayed by secondary cooling water occurring transversal crack and causing strand inner arcuate surface temperature because of the change of intensity of cooling, ensure that the intensity of cooling of strand inner arcuate surface does not change, solve the micro alloyed steel strand transverse corner crack defect difficult problem occurred in long-standing problem continuous casting production process, vital effect is played to raising micro alloyed steel slab quality, there is significant economic benefit, there is great popularizing value in industry.
Accompanying drawing explanation
Fig. 1 is secondary cooling water spraying rack lifting device structure figure;
Fig. 2 is secondary cooling water spraying rack lowering or hoisting gear and secondary cooling water flow regulator johning knot composition;
Fig. 3 is Process Control System schematic diagram;
Be labeled as in figure: pneumatic cylinder 1, piston 2, piston rod 3, epicoele air inlet pipe 4, epicoele escape pipe 5, epicoele solenoid valve 6, epicoele electromagnetic switch valve 7, cavity of resorption air inlet pipe 8, cavity of resorption escape pipe 9, cavity of resorption solenoid valve 10, cavity of resorption electromagnetic switch valve 11, upper cavity pressure sensor 12, displacement transducer 13, cavity of resorption pressure sensor 14, secondary cooling water flow electromagnetic control valve 15, secondary cooling water flow sensor 16, computer 17, epicoele solenoid valve PLC18, cavity of resorption solenoid valve PLC19, epicoele electromagnetic switch valve PLC20, cavity of resorption electromagnetic switch valve PLC21, pneumatic cylinder information feed back PLC22, secondary cooling water flow electromagnetic control valve PLC23, secondary cooling water flow feedback PLC24, underframe support 25, secondary cooling water spraying rack 26, epicoele overflow valve 27, cavity of resorption overflow valve 28, screen pack 29, spray gun 30, strand 31.
Detailed description of the invention
The present invention prevents the system of micro alloyed steel strand continuous casting chink defect from comprising secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator and Process Control System, as shown in Figure 1, secondary cooling water spraying rack lowering or hoisting gear is made up of pneumatic cylinder 1, piston 2 and piston rod 3, piston rod 3 upper end is connected with piston 2, piston 2 is assemblied in pneumatic cylinder 1 and pneumatic cylinder is divided into epicoele and cavity of resorption, epicoele sidewall is connected with epicoele air inlet pipe 4 and epicoele escape pipe 5 respectively, epicoele air inlet pipe 4 is installed epicoele solenoid valve 6, epicoele escape pipe 5 is installed epicoele electromagnetic switch valve 7; Cavity of resorption sidewall is connected with cavity of resorption air inlet pipe 8 and cavity of resorption escape pipe 9 respectively, cavity of resorption air inlet pipe 8 is installed cavity of resorption solenoid valve 10, cavity of resorption escape pipe 9 is installed cavity of resorption electromagnetic switch valve 11; Epicoele is provided with upper cavity pressure sensor 12 and displacement transducer 13, and displacement transducer 13 is for detecting the relative position between pneumatic cylinder 1 and piston 2; Cavity of resorption is provided with cavity of resorption pressure sensor 14; Pneumatic cylinder 1 epicoele and cavity of resorption are also provided with epicoele overflow valve 27 and cavity of resorption overflow valve 28, are within the scope of safe-working pressure for the protection of pneumatic cylinder 1; Epicoele escape pipe 5 is separately installed with screen pack 29 with cavity of resorption escape pipe 9 away from the one end be connected with pneumatic cylinder 1, prevents the impurity in air from entering in pneumatic cylinder 1.
Fig. 2 shows, secondary cooling water spraying rack lowering or hoisting gear is 4 covers, fan-shaped section is fixed with the upper surface of 4 underframe supports 25 respectively along the lower end of the piston rod 34 underframes of the both sides, import and export position in throwing direction being fixed with 4 underframe supports 25,4 cover secondary cooling water spraying rack lowering or hoisting gear; Secondary cooling water spraying rack 26 is fixedly connected at the sidewall of the pneumatic cylinder 1 of 4 cover secondary cooling water spraying rack lowering or hoisting gears, secondary cooling water spraying rack 26 is installed by some spray guns 30, the water inlet manifold of spray gun 30 is provided with secondary cooling water flow electromagnetic control valve 15 and secondary cooling water flow sensor 16, the water in spray gun 30 is injected into the inner arcuate surface of strand 31.
Fig. 3 shows, Process Control System by computer 17, be connected epicoele solenoid valve PLC18, the cavity of resorption solenoid valve PLC19, epicoele electromagnetic switch valve PLC20, cavity of resorption electromagnetic switch valve PLC21, pneumatic cylinder information feed back PLC22, secondary cooling water flow electromagnetic control valve PLC23, the secondary cooling water flow feedback PLC24 that carry out data communication respectively with computer 17 and form; Epicoele solenoid valve PLC18 is connected with epicoele solenoid valve 6, and cavity of resorption solenoid valve PLC19 is connected with cavity of resorption solenoid valve 10; Epicoele electromagnetic switch valve PLC20 is connected with epicoele electromagnetic switch valve 7, and cavity of resorption electromagnetic switch valve PLC21 is connected with cavity of resorption electromagnetic switch valve 11; Pneumatic cylinder information feed back PLC22 is connected with displacement transducer 13 with upper cavity pressure sensor 12, cavity of resorption pressure sensor 14 simultaneously, secondary cooling water flow electromagnetic control valve PLC23 is connected with secondary cooling water flow electromagnetic control valve 15, and secondary cooling water flow feedback PLC24 is connected with secondary cooling water flow sensor 16.
The present invention prevents the using method of the system of micro alloyed steel strand continuous casting chink defect, comprises following steps:
Step 1: manual-lock epicoele solenoid valve 6, cavity of resorption solenoid valve 10, epicoele electromagnetic switch valve 7, cavity of resorption electromagnetic switch valve 11 and secondary cooling water flow electromagnetic control valve 15;
Step 2: the mode of operation of computer 17 is adjusted to " open and water front control " pattern, then, computer 17 is according to the instruction of site operation people, and control secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator respectively, concrete operation step is:
(1), computer for controlling 17 couples of epicoele solenoid valve PLC18 send command signal, and open epicoele solenoid valve 6, now pressure-air enters the epicoele of pneumatic cylinder 1 under the effect of ambient pressure; Meanwhile, send command signal to cavity of resorption electromagnetic switch valve PLC21, open cavity of resorption electromagnetic switch valve 11, pneumatic cylinder 1 moves up under the pressure of pressure-air, drives secondary cooling water spraying rack to be lifted to peak together; After displacement transducer 13 feeds back peak positional information, epicoele solenoid valve 6 and cavity of resorption electromagnetic switch valve 11 are closed by computer for controlling 17, realize secondary cooling water spraying rack and leave standstill in highest order motionless with pneumatic cylinder 1;
(2), computer for controlling 17 couples of secondary cooling water flow electromagnetic control valve PLC23 send command signal, control secondary cooling water flow electromagnetic control valve 15 by this PLC to open, now high pressure secondary cooling water sprays from each spray gun 30 be arranged on spraying rack, secondary cooling water flow sensor 16 can feed back secondary cooling water house steward data on flows to computer 17 in real time by secondary cooling water flow feedback PLC24, according to these data, command signal is sent to secondary cooling water flow electromagnetic control valve PLC23 in real time by computer 17, the aperture of adjustment secondary cooling water flow electromagnetic control valve 15, secondary cooling water flow is made to meet production technology setting requirement,
(3), after the feedback result of secondary cooling water flow sensor 16 and the cooling water flow of manufacturing technique requirent match, computer for controlling 17 sends command signal to secondary cooling water flow electromagnetic control valve PLC23, secondary cooling water flow electromagnetic control valve 15 cuts out, then according to the spraying effect in step (2), the angle of inclination of each spray gun 30 on manual fine-tuning secondary cooling water spraying rack, guarantee that the cooling water that on spraying rack, each row's spray gun 30 sprays can be sprayed onto on the whole inner arc of strand 31 completely, uniformly, realize the Homogeneous cooling of strand 31 inner arcuate surface;
Step 3: input the spray angle of secondary cooling water spray gun 30 and the width parameter of strand 31 in computer 17, current time secondary cooling water spraying rack position is defined as dead-center position;
Step 4: after formally watering steel, is adjusted to " open and water rear control " pattern by the mode of operation of computer 17, in computer 17, manually input the vertical range along strand 31 inner arc edge to inner arc center line
(
be for different microalloy steel grade Simulation on Temperature Field test draw), inner arc edge is need not to be cooled the region that water sprays to the width regions of inner arc center line, computer 17 can according to its plug-in, first calculates the distance that the pneumatic cylinder 1 that corresponds moves down
, that is:
In formula:
for for this steel grade, the vertical range along strand inner arc edge to inner arc center line of staff's setting, unit: m;
for pneumatic cylinder 1 needs the distance that moves down, unit: m;
for the spray angle of secondary cooling water spray gun 30, scope is 110 ° ~ 120 °;
After calculating completes, computer 17 can send instruction to cavity of resorption solenoid valve PLC19, control cavity of resorption solenoid valve 10 to open, now pressure-air enters the cavity of resorption of pneumatic cylinder 1 under the effect of ambient pressure, meanwhile, computer 17 sends command signal to epicoele electromagnetic switch valve PLC20, opened by epicoele electromagnetic switch valve 7, now, pneumatic cylinder 1 will move down, then the numerical value that feeds back for cycle monitoring displacement transducer 13 with 10ms ~ 20ms of computer 17, when this numerical value equals
time, then computer 17 can send instruction by downward chamber solenoid valve PLC19 and epicoele electromagnetic switch valve PLC20 simultaneously, cavity of resorption solenoid valve 10 and epicoele electromagnetic switch valve 7 is closed, guarantees that pneumatic cylinder 1 is in this position transfixion;
Step 5: after the operation of completing steps 4, computer 17, by its plug-in, is ensureing under the prerequisite that the cooling water inflow in strand 31 inner arcuate surface unit are is constant, calculates the adjustment amount of secondary cooling water flow after pneumatic cylinder 1 change in location
, that is:
In formula:
front set secondary cooling water flow is watered, unit: m for opening
3/ h;
for the secondary cooling water flow after the adjustment of spraying rack position, unit: m
3/ h;
for the width of strand, unit: m;
Then, computer 17 sends instruction to secondary cooling water flow electromagnetic control valve PLC23, the aperture of secondary cooling water flow electromagnetic control valve 15 turned down, the numerical value simultaneously fed back for cycle Real-Time Monitoring secondary cooling water flow sensor 16 with 10ms ~ 20ms, when this numerical value equals
time, 17, computer sends instruction to secondary cooling water flow electromagnetic control valve PLC23, the aperture of secondary cooling water flow electromagnetic control valve 15 is fixed, and guarantees that secondary cooling water flow no longer changes;
Step 6: watering after steel produces when completing, again performing step 1 by staff and operating, and according to the production schedule, preparing to carry out step 2 and operate.
Claims (4)
1. prevent the system of micro alloyed steel strand continuous casting chink defect, it is characterized in that: it comprises secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator and Process Control System, described secondary cooling water spraying rack lowering or hoisting gear is by pneumatic cylinder (1), piston (2) and piston rod (3) are formed, piston rod (3) upper end is connected with piston (2), piston (2) is assemblied in pneumatic cylinder (1) and pneumatic cylinder is divided into epicoele and cavity of resorption, epicoele sidewall is connected with epicoele air inlet pipe (4) and epicoele escape pipe (5) respectively, epicoele air inlet pipe (4) is upper installs epicoele solenoid valve (6), epicoele escape pipe (5) is upper installs epicoele electromagnetic switch valve (7), cavity of resorption sidewall is connected with cavity of resorption air inlet pipe (8) and cavity of resorption escape pipe (9) respectively, and cavity of resorption air inlet pipe (8) is upper installs cavity of resorption solenoid valve (10), and cavity of resorption escape pipe (9) is upper installs cavity of resorption electromagnetic switch valve (11), epicoele is provided with upper cavity pressure sensor (12) and displacement transducer (13), and cavity of resorption is provided with cavity of resorption pressure sensor (14), described secondary cooling water flow regulator is made up of the secondary cooling water flow electromagnetic control valve (15) be arranged on fan-shaped section secondary cooling water main line and secondary cooling water flow sensor (16), described Process Control System by computer (17), be connected the epicoele solenoid valve PLC(18 carrying out data communication respectively with computer (17)), cavity of resorption solenoid valve PLC(19), epicoele electromagnetic switch valve PLC(20), cavity of resorption electromagnetic switch valve PLC(21), pneumatic cylinder information feed back PLC(22), secondary cooling water flow electromagnetic control valve PLC(23), secondary cooling water flow feedback PLC(24) form, epicoele solenoid valve PLC(18) be connected with epicoele solenoid valve (6), cavity of resorption solenoid valve PLC(19) be connected with cavity of resorption solenoid valve (10), epicoele electromagnetic switch valve PLC(20) be connected with epicoele electromagnetic switch valve (7), cavity of resorption electromagnetic switch valve PLC(21) be connected with cavity of resorption electromagnetic switch valve (11), pneumatic cylinder information feed back PLC(22) be connected with displacement transducer (13) with upper cavity pressure sensor (12), cavity of resorption pressure sensor (14) simultaneously, secondary cooling water flow electromagnetic control valve PLC(23) be connected with secondary cooling water flow electromagnetic control valve (15), secondary cooling water flow feedback PLC(24) be connected with secondary cooling water flow sensor (16), described secondary cooling water spraying rack lowering or hoisting gear is 4 covers, the lower end of its piston rod (3) respectively be installed on the upper surface of fan-shaped section underframe along 4 underframe supports (25) of the both sides, import and export position in throwing direction and be fixedly connected with, secondary cooling water spraying rack (26) overlaps secondary cooling water spraying rack lowering or hoisting gear respectively pneumatic cylinder (1) sidewall with 4 is fixedly connected with.
2. prevent the system of micro alloyed steel strand continuous casting chink defect as claimed in claim 1, it is characterized in that: pneumatic cylinder (1) epicoele of described secondary cooling water spraying rack lowering or hoisting gear and cavity of resorption are also provided with epicoele overflow valve (27) and cavity of resorption overflow valve (28); Epicoele escape pipe (5) is provided with screen pack (29) with cavity of resorption escape pipe (9) away from the one end be connected with pneumatic cylinder (1).
3. the using method preventing the system of micro alloyed steel strand continuous casting chink defect as described in above-mentioned any one claim, is characterized in that: it comprises the following steps:
Step 1: manual-lock epicoele solenoid valve (6), cavity of resorption solenoid valve (10), epicoele electromagnetic switch valve (7), cavity of resorption electromagnetic switch valve (11) and secondary cooling water flow electromagnetic control valve (15);
Step 2: the mode of operation of computer (17) is adjusted to " open and water front control " pattern, then, computer (17) is according to the instruction of site operation people, and control secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator respectively, concrete operation step is:
(1), computer for controlling (17) is to epicoele solenoid valve PLC(18) send command signal, open epicoele solenoid valve (6), now pressure-air enters the epicoele of pneumatic cylinder (1) under the effect of ambient pressure; Meanwhile, to cavity of resorption electromagnetic switch valve PLC(21) send command signal, open cavity of resorption electromagnetic switch valve (11), pneumatic cylinder (1) moves up under the pressure of pressure-air, drives secondary cooling water spraying rack to be lifted to peak together; After displacement transducer (13) feeds back peak positional information, epicoele solenoid valve (6) and cavity of resorption electromagnetic switch valve (11) are closed by computer for controlling (17), realize secondary cooling water spraying rack and leave standstill in highest order motionless with pneumatic cylinder (1);
(2), computer for controlling (17) is to secondary cooling water flow electromagnetic control valve PLC(23) send command signal, control secondary cooling water flow electromagnetic control valve (15) by this PLC to open, now high pressure secondary cooling water ejection from each spray gun (30) be arranged on spraying rack, secondary cooling water flow sensor (16) meeting is by secondary cooling water flow feedback PLC(24) in real time to computer (17) feedback secondary cooling water house steward data on flows, according to these data, by computer (17) in real time to secondary cooling water flow electromagnetic control valve PLC(23) send command signal, the aperture of adjustment secondary cooling water flow electromagnetic control valve (23), secondary cooling water flow is made to meet production technology setting requirement,
(3), after the feedback result of secondary cooling water flow sensor (16) and the cooling water flow of manufacturing technique requirent match, computer for controlling (17) is to secondary cooling water flow electromagnetic control valve PLC(23) send command signal, secondary cooling water flow electromagnetic control valve (15) cuts out, then according to the spraying effect in step (2), the angle of inclination of each spray gun (30) on manual fine-tuning secondary cooling water spraying rack, guarantee that the cooling water that on spraying rack, each row's spray gun (30) sprays can be complete, be sprayed onto on the whole inner arc of strand (31) uniformly, realize the Homogeneous cooling of strand inner arcuate surface,
Step 3: the spray angle of input secondary cooling water spray gun (30) and the width parameter of strand (31) in computer (17), be defined as dead-center position by current time secondary cooling water spraying rack position;
Step 4: after formally watering steel, is adjusted to " open and water rear control " pattern by the mode of operation of computer (17), manually the vertical range of input along strand inner arc edge to inner arc center line in computer (17)
, inner arc edge is need not to be cooled the region that water sprays to the width regions of inner arc center line, and computer (17) can according to its plug-in, first calculates the distance that the pneumatic cylinder (1) that corresponds moves down
, that is:
In formula:
for for this steel grade, the vertical range along strand inner arc edge to inner arc center line of staff's setting, unit: m;
for pneumatic cylinder (1) needs the distance that moves down, unit: m;
for the spray angle of secondary cooling water spray gun;
After calculating completes, computer (17) meeting is to cavity of resorption solenoid valve PLC(19) send instruction, control cavity of resorption solenoid valve (10) to open, now pressure-air enters the cavity of resorption of pneumatic cylinder (1) under the effect of ambient pressure, meanwhile, computer (17) is to epicoele electromagnetic switch valve PLC(20) send command signal, epicoele electromagnetic switch valve (7) is opened, now, pneumatic cylinder (1) will move down, then the numerical value that feeds back for cycle monitoring displacement transducer (13) with 10ms ~ 20ms of computer (17), when this numerical value equals
time, then computer (17) meeting downward chamber solenoid valve PLC(19 simultaneously) and epicoele electromagnetic switch valve PLC(20) send instruction, cavity of resorption solenoid valve (10) and epicoele electromagnetic switch valve (7) are closed, guarantees that pneumatic cylinder (1) is in this position transfixion;
Step 5: after the operation of completing steps 4, computer (17), by its plug-in, is ensureing under the prerequisite that the cooling water inflow in strand (31) inner arcuate surface unit are is constant, calculates the adjustment amount of secondary cooling water flow after pneumatic cylinder (1) change in location
, that is:
In formula:
front set secondary cooling water flow is watered, unit: m for opening
3/ h;
for the secondary cooling water flow after the adjustment of spraying rack position, unit: m
3/ h;
for the width of strand, unit: m;
Then, computer (17) is to secondary cooling water flow electromagnetic control valve PLC(23) send instruction, the aperture of secondary cooling water flow electromagnetic control valve (15) turned down, the numerical value simultaneously fed back for cycle Real-Time Monitoring secondary cooling water flow sensor (16) with 10ms ~ 20ms, when this numerical value equals
time, computer (17) is then to secondary cooling water flow electromagnetic control valve PLC(23) send instruction, the aperture of secondary cooling water flow electromagnetic control valve (15) is fixed, guarantees that secondary cooling water flow no longer changes;
Step 6: watering after steel produces when completing, again performing step 1 by staff and operating, and according to the production schedule, preparing to carry out step 2 and operate.
4. prevent the using method of the system of micro alloyed steel strand continuous casting chink defect as claimed in claim 3, it is characterized in that: along strand (31) inner arc edge to the vertical range of inner arc center line in described step 4
be for different microalloy steel grade Simulation on Temperature Field test draw; In described step 4, the spray angle scope of secondary cooling water spray gun (30) is 110 ° ~ 120 °.
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| CN107303601A (en) * | 2016-04-20 | 2017-10-31 | 宝山钢铁股份有限公司 | The cooling monitoring system and method for strand |
| WO2021259376A1 (en) | 2020-06-25 | 2021-12-30 | 宝山钢铁股份有限公司 | Method for reducing surface cracks of casting blank by using ferrite phase |
| CN114734012A (en) * | 2022-03-30 | 2022-07-12 | 东北大学 | Slab surface quenching system and process based on horizontal section of continuous casting machine |
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| CN114734012A (en) * | 2022-03-30 | 2022-07-12 | 东北大学 | Slab surface quenching system and process based on horizontal section of continuous casting machine |
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