CN101745551B - Free cooling method of hot rolling band steel - Google Patents
Free cooling method of hot rolling band steel Download PDFInfo
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- CN101745551B CN101745551B CN2008100440947A CN200810044094A CN101745551B CN 101745551 B CN101745551 B CN 101745551B CN 2008100440947 A CN2008100440947 A CN 2008100440947A CN 200810044094 A CN200810044094 A CN 200810044094A CN 101745551 B CN101745551 B CN 101745551B
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Abstract
The invention provides a free cooling method of hot rolling band steel, which featured in that temperature testing devices and induction feedback devices are arranged respectively at the fine rolling outlet, the coiling inlet and the laminar flow cooling roller way acting as the middle portion of the cooling device; the temperature of the laminar flow cooling water in the three sections are adjusted and controlled after the coiling temperature difference of the head and tail of the band steel and the middle portion of the band steel is tested and fed back. Therefore, the method of the invention can not only control the head and tail temperature of the band steel freely, but also control the length of the head and tail of the band steel freely.
Description
Technical field
The present invention relates to field of metallurgy, particularly, the present invention relates to a kind of hot strip rolling cooling means, more specifically, the present invention relates to a kind ofly come out to the hot steel band laminar flow cooling means of the section of batching from last rolling mill of finish rolling (last machine roller).
Background technology
Hot rolling is to be raw material with slab (being mainly continuous casting billet), makes the band steel by roughing unit and mm finishing mill unit after heating.The hot steel band that comes out from last rolling mill of finish rolling is cooled to design temperature by laminar flow, is rolled into steel coil strip by coiling machine.Cooled steel coil strip, according to user's different demands, (smooth, aligning, crosscut or rip cutting, check, weigh, pack and sign etc.) processes and is steel plate, smooth volume and rip cutting steel band product through different finishing line.Hot-strip is commonly used for structural steel, and is therefore, very high to the performance processing request.
As mentioned above, on the roller-way between mm finishing mill unit and the coiling machine, be provided with cooling facility for laminar flow, respectively band steel upper and lower surface is carried out the laminar flow cooling,, will be with the coiling temperature of steel to be controlled between 550 ~ 650 ℃ according to the group number and the water yield that band steel steel grade, thickness, speed and finishing temperature are regulated nozzle.Band steel after rolling is sent into coiling machine by runout table through pinch roll.
After coiling machine will be with the coil of strip rolling, connect volume, turnup to the 1# lifting platform through coil stripping car, the vertical-lift of 1# lifting platform is to high together with step rate, and step rate has dragged coil of strip and has been put on the conveyer chain.On coil of strip conveyer chain, can measure coil of strip, mark and packing.
Adopt corresponding cooling, the coiling temperature that the band steel that finishing mill shuts out is cooled to hot-strip to stipulate by finishing temperature by band steel laminar cooling system on runout table.Because coiling temperature has very big influence to the performance of band steel, so coiling temperature must be controlled in certain target coiling temperature margin of tolerance.It is band steel cooled region after the finish rolling that laminar flow cools off, and it mainly acts on is by control laminar flow cooling water spray valve, with the coiling temperature of being with steel to be cooled to require from a certain finishing temperature.At this moment, the type of cooling of band steel, cooling water inflow is all calculated according to different steel grades, specification, finishing temperature, coiling temperature by computer and sets and control.
Kind based on hot-rolled product is constantly expanded, this temperature controlling has been had different requirements, for example the patent No. be " CN02132975.3 ", denomination of invention for the granted patent of " three section laminar flow cooling technology for hot rolling band steel " be exactly to put a patented technology of formation before this.
Yet,, require not only to relate to above technology from present development trend, and how to realize with freely cooling off under the steel total length situation, the band steel that for example has requires the relative total length temperature of head temperature on the low side, and afterbody requires situations such as temperature drift owing to the air cooling reason.And technology in the past lacks control to this.
Patent application is that " CN02144825.6 ", denomination of invention disclose a kind of hot-strip intermediate blank cooling facility for laminar flow for applying for a patent of " hot-strip intermediate blank laminar flow cooling means ".Its core is, 2～5 groups of cooling facility for laminar flow are installed in the roughing mill exit, forming length is the laminar flow cooling zone of L, by calculating the intermediate blank every bit through the time t1 of laminar flow cooling zone and the total time t2 of an intermediate blank process laminar flow cooling zone, refer again to the steel grade and the specification of intermediate blank, calculate to making this intermediate blank be cooled to the cooling water flow Q of the temperature that requires.This method mainly is applicable to the intermediate blank temperature-controlled rolling of various types of hot-strip factory.
The patent No. is that " CN200410021048.7 ", denomination of invention disclose following technology for the granted patent of " a kind of band steel cooling facility for laminar flow and control cooling means thereof ": the laminar flow cooled region is divided into two cooling zones, has strong cold function simultaneously, in this patented technology, band steel cooling facility for laminar flow and control cooling means thereof have been comprised.It installs part mainly is made up of upper stream collector and following spray header, and the cooling zone comprises main cold section and fine cold-leg two parts, and cold section of master and fine cold-leg are formed by the bottom spray header group of a plurality of upper layer flows collector groups and respective numbers.Its control cooling means is calculated by setting by computer and realization is calculated in feedback, feedforward.To reach coiling temperature control and cooling velocity control requirement.
Along with improving constantly of hot rolling technology technology, continually developing of kind, chilling temperature to the band steel requires also more and more higher, how to improve the qualification rate of hot-rolled product, this just requires hot-rolled process constantly surmounting qualitatively at its product, wherein for hot-rolled product, the up-to-standard rate of band steel toe tail will directly have influence on the production cost of hot-rolled product.
Because the characteristics of hot strip rolling production are continuity, rapidity, real-time, control accuracy height.And the temperature controlled accuracy of band steel is the important assurance of strip quality.Therefore, in recent years, the improving constantly of hot rolling technology technology, hot rolling performance requirement for the band steel is also more and more higher, consider from technological angle at present, when constantly reducing the input of band steel chemical composition, all can take to optimize the performance that band steel cooling procedure improves the band steel.
The up-to-standard rate of hot-rolled product band steel toe tail will directly have influence on the production cost of hot-rolled product.For this reason, for the TEMPERATURE FOR HOT STRIP LAMINAR Cooling Control new requirement has been proposed.
In the patent No. is that " CN02132975.3 ", denomination of invention disclose a kind of three section laminar flow cooling technology for hot rolling band steel for " three section laminar flow cooling technology for hot rolling band steel " granted patent, adopts computer to laminar flow cooling control on this technology.It is characterized in that the band steel is made as three sections to be cooled off, first section is the long head sections of 30m that is, second section is the interlude of band steel, and the 3rd section is the long end segment of 20m that is.Three sections chilling temperature is controlled at respectively: interlude equals the target coiling temperature, and head sections is greater than 20～50 ℃ of target coiling temperatures, and end segment is greater than 20～40 ℃ of target coiling temperatures.This invention three section laminar flow cooling technology for hot rolling band steel can improve the performance uniformity of steel band, solve head temperature and lowly brought hot-strip production approach the easy steel-fastening of specification, produce the difficult problem that thick specification is easily spread out steel, satisfied the requirement of next procedure simultaneously owing to the improvement of steel band performance uniformity better.
Yet, in patent application is that " CN02144825.6 ", denomination of invention are in the applying for a patent of " hot-strip intermediate blank laminar flow cooling means ", because it mainly cools off control in the roughing outlet, so not with regard to steel then the cooling that exports to before batching of finish rolling pay attention to, this patented technology is mainly cooled off intermediate blank simultaneously, and do not cool off at band steel finished product, thus, cause it in control, to have bigger difference.
In the patent No. is " CN200410021048.7 ", denomination of invention is the granted patent of " a kind of band steel cooling facility for laminar flow and control cooling means thereof ", the patent No. is " CN02132975.3 ", denomination of invention in " three section laminar flow cooling technology for hot rolling band steel " granted patent with the technical scheme of originally declaring more approaching be the latter, the patent No. is " CN02132975.3 ", denomination of invention is all failed by the band steel is adopted segmentation method more flexibly on the laminar flow cooling roller bed for " three section laminar flow cooling technology for hot rolling band steel " granted patent, therefore, can't realize rising, not possess freely controlling of band steel toe tail temperature simultaneously with the temperature of steel toe tail.
Summary of the invention
For overcoming the problems referred to above, the objective of the invention is to: a kind of hot strip rolling cooling means is provided, described hot strip rolling cooling means is by adopting segmentation method flexibly to the band steel on the laminar flow cooling roller bed, thus, method of the present invention not only can be controlled freely to the head and tail temperature of band steel, in addition, method of the present invention also can be carried out length control freely to band steel toe tail length.
For realizing described purpose, hot strip rolling cooling means technical scheme of the present invention is as follows.
A kind of hot strip rolling cooling means ties up to TEMPERATURE FOR HOT STRIP LAMINAR cooling traffic coverage a plurality of points for measuring temperature, computer-controlled feedback and cooling water thermoregulating system is set, it is characterized in that,
Respectively the finish rolling exit, batch the porch, and laminar flow cooling roller bed as the mid portion of cooling device on temperature measurer and sensory feedback device are set, after the temperature difference of the coiling temperature of band steel toe, tail and middle part coiling temperature detected respectively, feeds back, the target coiling temperature is set, according to this target coiling temperature, the temperature of the laminar cooling water of this three section is carried out the adjusting control of segmentation cooling.
According to hot strip rolling cooling means of the present invention, it is characterized in that described segmentation cooling is as follows:
If specified medium temperature and corresponding middle air cooling time, then must be cooled to medium temperature from finishing temperature earlier with the cooldown rate that requires with steel, require to carry out the water-cooled second time according to cooldown rate through the air cooling that requires again after time, that is, form water-cooled-＞air cooling-＞the segmentation refrigerating mode of water-cooled.
According to hot strip rolling cooling means of the present invention, it is characterized in that described segmentation refrigerating mode comprises that in proper order first forces cooling section, common cooling section, second to force cooling section and meticulous cooling section.
The finish rolling exit is machine roller place, finish rolling end, and described TEMPERATURE FOR HOT STRIP LAMINAR cooling traffic coverage is 140-160m from planishing roll to the siding-to-siding block length that batches the porch promptly.
In theory, to the cooling of band steel the time, need the regular hour, because be with steel to be in running status this moment, so need certain cooling length (needs of time) in conjunction with the traditional requirement of hot rolling, can guarantee to be with steel to be cooled off fully, simultaneously, cooling velocity in cooling procedure and the temperature fall in certain hour, the end properties of band steel will directly be had influence on, so in the technical program, preferably, be 140-160m from planishing roll to the siding-to-siding block length that batches the porch.
According to hot strip rolling cooling means of the present invention, it is characterized in that, the temperature of the laminar cooling water of described band steel toe, tail and middle part three sections is regulated control to be respectively: interlude equals the target coiling temperature, head sections is greater than 20～50 ℃ of target coiling temperatures, and end segment is greater than 20～40 ℃ of target coiling temperatures.
According to hot strip rolling cooling means of the present invention, it is characterized in that the maximum water supply capacity of described laminar flow cooling is between 36000-40000 m3/h.
According to hot strip rolling cooling means of the present invention, it is characterized in that, require as follows to the cooling that relates to each section:
(1) first forces cooling section: require cooling length between 18-22 rice, satisfy the requirement of 300 ℃ of maximum temperature declines;
(2) common cooling section: require length between 18-25 rice, owing to have certain air cooling zone in its position, its length requirement is about 6-10 rice, so its corresponding cooling capacity is roughly about 30-50 ℃;
(3) second force cooling section: cooling length satisfies maximum temperature and descends 300 ℃ between 40-45 rice;
(4) meticulous cooling section: the major function of this control section is that the temperature of carrying out laminar flow cooling back band steel is carried out an amount of adjustment that becomes more meticulous, consider simultaneously through forcing the rise of cooling back temperature, so the length for it is controlled roughly at 12-18 rice, its corresponding cooling capacity is roughly about 30-50 ℃.
According to hot strip rolling cooling means of the present invention, it is characterized in that control requires as follows for the temperature difference:
(1) strip finishing temperature is generally at 830～870 ℃;
(2) the band steel must be at first be cooled to medium temperature (about 650 ℃～750 ℃, relevant with steel grades, rolling mill practice) with certain cooling velocity, and not high to the cooldown rate required precision, capping gets final product, but the requirement of medium temperature control accuracy is arranged;
(3) keep certain air cooling time (about 3～20 seconds, relevant with steel grades, rolling mill practice) then, in order to satisfy the requirement of band steel phase transformation, there is special requirement its air cooling time, so need satisfy 3～20 seconds air cooling time;
(4) the band steel is cooled to martensite phase transformation district with higher cooldown rate (as about 90 ℃/s) subsequently, and its cooldown rate requires big as far as possible.
According to hot strip rolling cooling means of the present invention, it is characterized in that the temperature measurer that is provided with on the laminar flow cooling roller bed of the mid portion of described cooling device is between the 6#BANK-8#BANK (cooling frame).
According to hot strip rolling cooling means of the present invention, it is characterized in that, the adjustment control of described laminar cooling water to band steel toe portion, system according to the thickness of band steel to determine the segment length of every block of band steel.Specific as follows: (following data are the experience time, mainly determine according to the speed of band steel operation:
| Thickness | The segment length |
| ＜4mm | 0.8-1.2m |
| ＞＝4mm＜7 | 0.6-0.8m |
| ＞7mm | 0.5-0.6m |
According to hot strip rolling cooling means of the present invention, it is characterized in that the segment length of described band steel divides two big classes: slab, thin plate, the length of total length section=every segment length * n section (being divided into the 800-1000 section usually).
According to above-mentioned method, obtain the hop count of this piece band steel in conjunction with the length of band steel; Belt steel thickness 3mm for example, length 900.15m, then this band steel is 900 sections.
Thus, can reach the purpose of accurate each section of control temperature.
The segment length that control system provides according to laminar cooling system just produces (the expression: NO.1, NO.2 of a segment number whenever the band steel moves a segment length ... NO.n).Control system will be sent laminar cooling system after will moving several times measured value and the band steel segment number coupling by this point of every bit of inherent three measurement points of segment length's time (EMP, MMP and HMP) with steel, realize the tracking control of laminar flow cooling.
Three measurement points, EMP, MMP and HMP, promptly respectively expression be positioned at the measurement point 1 in finish rolling exit, as the measurement point 2 on the laminar flow cooling roller bed of the mid portion of cooling device and batch the measurement point 3 of porch.
According to hot strip rolling cooling means of the present invention, it is characterized in that, forcing with back, meticulous cooling zone an air cooling zone that does not have the water spray valve is arranged respectively between the cooling zone.
According to hot strip rolling cooling means of the present invention, it is characterized in that the adjusting of the coolant water temperature of cooling facility for laminar flow is undertaken by the aperture of selecting the water spray collector, aperture comprises standard-sized sheet, opens 1/2,1/4 and 1/3.
According to hot strip rolling cooling means of the present invention, it is characterized in that the coiling temperature of described band steel toe, tail is controlled respectively with the middle part coiling temperature.The temperature difference is finished by disposable switching.The head and tail temperature difference situation is set with respect to the deviation of middle part coiling temperature by length and head, the tail target temperature of head, tail.
According to hot strip rolling cooling means of the present invention, it is characterized in that the cooling facility for laminar flow that is provided with in the 30-34m scope that the adjustment control of described laminar cooling water to band steel afterbody is risen by finish rolling end machine roller carries out, and, forces cooling that is.Because this device adopted intensive relatively cooling manifold 12-24 group, satisfied descend 300 ℃ requirement of maximum temperature, simultaneously, can control the quantity of the switching and the switching of this cooling device according to the process system of different cultivars specification correspondence.
The adjustment control of described laminar cooling water to band steel toe portion is undertaken by the meticulous cooling device of laminar flow that is provided with in the distance crimping roller 30-34m of the place scope, and all the other mid portions are undertaken by the cooling device of 3-6 main cold-zone of zone line.
The cooling water collector of meticulous cooling device is arranged comparatively sparse, and the cooling water inflow flow of each cooling jet is less, generally is made up of 8-12 group collector.Be preferably, form (the cooling water inflow flow of each cooling jet of cooling manifold that this is sparse is identical with intensive cooling manifold) by 8 groups of sparse cooling manifolds.
According to hot strip rolling cooling means of the present invention, described hot strip rolling cooling means is by adopting segmentation method flexibly to the band steel on the laminar flow cooling roller bed, not only realize the rising of the temperature of band steel toe tail, possess freely controlling of band steel toe tail temperature simultaneously, for the control on the length end to end of band steel, realize length control freely simultaneously.
The simple declaration of accompanying drawing
Fig. 1 Figure 2 shows that hot strip rolling cooling means distance schematic diagram of the present invention.
Fig. 3 A, B are depicted as hot strip rolling cooling means computer control feedback course diagram of the present invention.
Figure 4 shows that cold section tracking of hot strip rolling cooling means layer of the present invention schematic diagram.
Figure 5 shows that the cold radiator cooler distribution schematic diagram of hot strip rolling cooling means layer of the present invention.
Figure 6 shows that cooling means of the present invention in 1880 hot rolling reeling temperature ± 20 ℃ precision control trend graph.
Figure 7 shows that the band steel afterbody high-temperature control curve map of hot strip rolling cooling means of the present invention.
Among the figure, 1 is finish rolling end frame, and 2 is the first pressure cooling section, 3 is common cooling section, and 4 is the second pressure cooling section, and 5 is meticulous cooling section, 6 is coiling clamp roller, and 7 is reel, and 8 are finish rolling outlet point for measuring temperature (instrument), 9 are laminar flow cooling point for measuring temperature (instrument), and 10 for batching inlet point for measuring temperature (instrument), and 11 for there not being the air cooling zone of water spray valve, 12 are the roughing zone, and 13 is the delay table zone, and 14 are the finish rolling zone, 15 is the laminar flow cooled region, and 16 for batching the zone.
The specific embodiment
Below, lift specific embodiment, further specify hot strip rolling cooling means of the present invention.
1880 hot rollings tie up on the laminar cooling system and will control with the section that steel is divided into certain-length.The section of band steel generates and follows the tracks of is the basis that 1880 hot-rolling laminar cooling system model control functions are implemented.
According to 1880 hot-rolling laminar cooling systems of present embodiment, according to the segment length of the thickness of being with steel with definite every block of band steel.
Specific as follows: (following data are the experience time, mainly determine according to the speed of band steel operation;
| Thickness | The segment length |
| ＜4mm | 0.8-1.2m |
| ＞＝4mm，＜7mm | 0.6-0.8m |
| ＞7mm | 0.5-0.6m |
According to above-mentioned method, obtain the hop count of this piece band steel in conjunction with the length of band steel; Belt steel thickness 3mm for example, length 900.15m, then this band steel is divided into 900 sections, offers control system.
The segment length that control system provides according to laminar cooling system just produces a segment number whenever the band steel moves a segment length, specifically is expressed as: NO.1, NO.2 ... NO.n.Control system will be with steel to move a segment length in the time, after the several times measured value of the every bit of three measurement points (EMP, MMP and HMP) and band steel segment number coupling, send laminar cooling system by this point, realize the tracking control of laminar flow cooling, realized the different length control scheme of band steel toe tail simultaneously.That is, as long as how many sections are length as requested be converted into and control in this programme.
Three measurement points, EMP, MMP and HMP, promptly respectively expression be positioned at the measurement point 1 in finish rolling exit, as the measurement point 2 on the laminar flow cooling roller bed of the mid portion of cooling device and batch the measurement point 3 of porch.The middle part coiling temperature is meant the target temperature when the band steel arrives Fig. 4 measurement point 2.
Band steel toe tail temperature controlling is set output through data transaction and processing to control system by the temperature objectives value of laminar cooling system receiving belt steel toe tail and total length.
Laminar cooling system sends the data of Open valve.The lag time of comparator valve and band steel in this process, constantly refresh the setting value that issues at the run location of laminar flow cooling roller bed, so that the operation of the valve opening and closing of optimal control system in time.Like this, in the time will cooling off control, the lag time of valve and the running time that section needs have been passed through just to the control corresponding section.
Particular content is as follows:
1, before the band steel enters the cooling zone (usually when finish rolling 1# frame is stung steel), carries out the head temperature precomputation of laminar flow cooling earlier; Consequently determine the unlatching of laminar flow coolant valve.The laminar flow cooling setpoint is responsible for valve opening is set down, so that control system is in time opened valve one by one before band steel toe portion arrives valve.
2,1880 laminar flow cooling zones are divided into main cold-zone and meticulous cooling zone.This main cold-zone comprises 1 district, intensive cold-zone (claim not only first force cooling zone), common (routine) cooling zone, intensive cooling 2 districts (but also claiming that second forces the cooling zone), and meticulous cooling zone comprises that feedforward district and feedback distinguish.After the band steel entered laminar flow cooling inlet measurement point, when band steel section arrived these control intervention point, the FEEDFORWARD CONTROL function recomputated the new settings value in related setting district, and the laminar flow cooling setpoint is passed to control system with under the setting data after treatment.
3, when band steel section was passed through middle measurement point, the medium temperature FEEDFORWARD CONTROL can be calculated the new setting value in related setting district, and the laminar flow cooling setpoint is passed to control system with under the setting data after treatment.
4, when band steel section was passed through laminar flow coolant outlet measurement point, the FEEDBACK CONTROL computing function can be calculated the new setting value in related setting district, and the laminar flow cooling setpoint in time carries out the transmission of data after treatment.
5, in order to control coiling temperature, for the FEEDFORWARD CONTROL district, a band steel will dynamically be set and dynamically be set again through presetting on production line.
For realizing freely cooling off of band steel toe tail, not being only required in the band steel position that the band steel goes out behind the finish rolling finished frame must follow the tracks of accurately, leave the time of finish rolling finished frame simultaneously for speed, the afterbody of band steel in running, and each nozzle that cooling relates to for laminar flow need be controlled accurately all.
In the present embodiment, corresponding equipment configuration is as follows:
Before batching inlet measurement houselet (inlet measurement point) and batching, measure outside two temperature measurers (being called EMP, CMP) in the houselet, also has a temperature measurer (MMP) on the laminar flow cooling roller bed, the position is placed on the mid portion of conventional cooling device, roughly is between 7#BANK and the 8#BANK (also the 6th, between the 7#BANK).
In front, main cold-zone and back, meticulous cooling zone an air cooling zone that does not have the water spray valve is arranged respectively.
Concrete distribution sketch is referring to the cooling facility for laminar flow distribution map.
Be to realize being with freely cooling off of steel to control, in the present embodiment, must carry out the head and tail temperature difference cooling and be with the steel segmentation to cool off with the temperature of laminar flow cooling.
The head and tail temperature difference cooling: the coiling temperature of technological requirement band steel toe, tail is controlled respectively with the middle part coiling temperature.The temperature difference is finished by disposable switching.The head and tail temperature difference situation is determined with respect to the deviation of middle part coiling temperature by length and head, the tail target temperature of head, tail.Head, tail length and temperature deviation are set by control system.
Segmentation cooling: if specified medium temperature and corresponding middle air cooling time, then must be cooled to medium temperature from finishing temperature earlier with the cooldown rate that requires, require to carry out the water-cooled second time according to cooldown rate again after the time through the air cooling that requires with steel.Form water-cooled-＞air cooling-＞the segmentation cooling control model of water-cooled.
In the present embodiment, described segmentation refrigerating mode comprises that in proper order first forces cooling section, common cooling section, second to force cooling section and meticulous cooling section.
The finish rolling exit is machine roller place, finish rolling end, and described TEMPERATURE FOR HOT STRIP LAMINAR cooling traffic coverage is 145-155m from planishing roll to the siding-to-siding block length that batches the porch promptly.
In the present embodiment, the temperature of the laminar cooling water of described band steel toe, tail and middle part three sections is regulated control to be respectively: interlude equals the target coiling temperature, head sections is greater than 20～50 ℃ of target coiling temperatures, and end segment is greater than 20～40 ℃ of target coiling temperatures.
In the present embodiment, the maximum water supply capacity of described laminar flow cooling is at 36000-40000m
3Between/the h.Require as follows to the cooling that relates to each section:
(1) first forces cooling section: require cooling length between 18-22 rice, satisfy the requirement of 300 ℃ of maximum temperature declines;
(2) common cooling section: require length between 18-25 rice, owing to have certain air cooling zone in its position, its length requirement of air cooling zone is about 6-10 rice, so its corresponding cooling capacity is roughly about 30-50 ℃;
(3) second force cooling section: cooling length satisfies maximum temperature and descends 300 ℃ between 18-22 rice;
(4) meticulous cooling section: the major function of this control section is that the temperature of carrying out laminar flow cooling back band steel is carried out an amount of adjustment that becomes more meticulous, consider simultaneously through forcing the rise of cooling back temperature, so the length for it is controlled roughly at 12-18 rice, its corresponding cooling capacity is roughly about 30-50 ℃.
In the present embodiment, control requires as follows for the temperature difference:
(1) strip finishing temperature is at 830～870 ℃;
(2) the band steel must be at first be cooled to medium temperature (about 650 ℃～750 ℃, relevant with steel grades, rolling mill practice) with certain cooling velocity, and not high to the cooldown rate required precision, capping gets final product, but the requirement of medium temperature control accuracy is arranged;
(3) keep certain air cooling time (about 5～15 seconds, relevant with steel grades, rolling mill practice) then, in order to satisfy the requirement of band steel phase transformation, there is special requirement its air cooling time, so need satisfy 5～15 seconds air cooling time;
(4) the band steel is cooled to martensite phase transformation district with higher cooldown rate (as about 90 ℃/s) subsequently, and its cooldown rate requires big as far as possible.
In the present embodiment, the temperature measurer that is provided with on the laminar flow cooling roller bed of the mid portion of described cooling device is between the 6#BANK-8#BANK.
In the present embodiment, the adjustment control of described laminar cooling water to band steel toe portion, system according to the thickness of band steel to determine the segment length of every block of band steel.For different thickness, specific as follows:
| Thickness | The segment length |
| ＜4mm | 0.8-1.2m |
| ＞＝4mm＜7 | 0.6-0.8m |
| ＞7mm | 0.5-0.6m |
According to hot strip rolling cooling means of the present invention, it is characterized in that the segment length of described band steel divides two big classes: slab, thin plate, the length of total length section=every segment length * n section (being divided into the 800-1000 section usually).
According to above-mentioned method, obtain the hop count of this piece band steel in conjunction with the length of band steel; Belt steel thickness 3mm for example, length 900.15m, then this band steel is 900 sections.
According to hot strip rolling cooling means of the present invention, it is characterized in that according to the segment length of described band steel, the length of four cooling zones is respectively:
1, first forces cooling section: 18-21m
2, common cooling section 20-25m
3, second force cooling section 40-45m
4, meticulous cooling section 12-16m
In the present embodiment, forcing with back, meticulous cooling zone an air cooling zone that does not have the water spray valve is arranged respectively between the cooling zone, the adjusting of the coolant water temperature of cooling facility for laminar flow is undertaken by the aperture of selecting the water spray collector, and aperture comprises standard-sized sheet, opens 1/2,1/4 and 1/3.
In the present embodiment, the coiling temperature of described band steel toe, tail is controlled respectively with the middle part coiling temperature.The temperature difference is finished by disposable switching.Described band steel is when common 1000m length, and all the other are interlude for head, the long respectively 10-30m of tail.Middle part coiling temperature deviation is definite relatively by head, tail length and target temperature for the head and tail temperature difference situation.
In the present embodiment, the cooling facility for laminar flow that is provided with in the 30-34m scope that the adjustment control of described laminar cooling water to band steel afterbody is risen by finish rolling end machine roller carries out, and, forces cooling that is.Because this device adopted intensive relatively cooling manifold 16-22 group, satisfied descend 300 ℃ requirement of maximum temperature, simultaneously, can control the quantity of the switching and the switching of this cooling device according to the process system of different cultivars specification correspondence.
In the present embodiment, the adjustment control of described laminar cooling water to band steel toe portion is undertaken by the meticulous cooling device of laminar flow that is provided with in the distance crimping roller 30-34m of the place scope, and all the other mid portions are undertaken by 3 cooling devices of the main cold-zone of zone line.The cooling water collector of meticulous cooling device is arranged comparatively sparse, and the cooling water flow of each cooling jet is less, is made up of 8-10 group collector.
In the present embodiment, utilization computer program control device.When being with steel on delay table, cooling strategy (scheme, plan) receives the excitation (instruction) that the plan of laminar flow cooling passage is calculated, at first the attribute (data) of the band steel that is about to set calculating is checked, whether the checking material is followed the tracks of the band steel that receives reasonable, if excitation, also need be judged the band steel roller-way that whether still mediates from computer display, because encouraged party to cause whole computing time not enough.
After checking rationally is with steel, laminar flow cold rolling strategy is that the coil of strip data are prepared in laminar flow cooling precomputation, mainly comprise man-machine interface input data, band steel initial data, default value data, and the relevant finishing pass plan that transmits of finish rolling actual achievement (reality) value or the calculated value that calculate, and these data are carried out verification.In these data, the intervention data of the man-machine interface of operative employee input (wearing tape speed, the layer cold type of cooling, cooling length, water temperature, fault valve, drop into valve etc. as finish rolling) priority is the highest, next is a finishing pass plan calculated data, be initial data, calculated value and default value once more.
The laminar flow cooling strategy is determined the water spraying mode coefficient for the coil of strip that will cool off, and whether the up-down symmetry according to the cooling of band steel has medium temperature and cooldown rate requirement, and the water spraying mode coefficient that selection is complementary promptly still opens 1/2,1/4,3/4 with water spray collector standard-sized sheet.
Laminar flow cold rolling strategy also will be to finishing heredity (experience) function, and the adaptation function of realizing the band steel is together calculated in collaborative back.The source of heredity (experience) data has three: heredity file, hereditary in short-term file and hereditary in short-term Buffer Pool when long.
The genetic data Buffer Pool is deposited the band steel of 10 different sizes of nearest rolling mistake in short-term.Search does not earlier have the Buffer Pool of genetic data in short-term of 10 records when not existing in wanting at present the rolling memory file of coefficient of heredity in short-term of band steel specification at a record, then uses it if exist, and the heredity file obtains coefficient of heredity when long otherwise read.Heredity file and hereditary in short-term file are deposited the band steel empirical data of the different size of more, nearest rolling mistake when long.
Band steel toe tail temperature FEEDBACK CONTROL: when before the arrival of section tail is batched, measuring the houselet position, carry out FEEDBACK CONTROL by the measured data that the segment data organization procedure provides.The function of feedback process is the water-cooled regulated quantity according to feedback control section in the actual measured value feedback control section.
When carrying out FEEDBACK CONTROL, must obtain the coiling temperature of this section reality.According to the deviation of actual coiling temperature and target coiling temperature, the control of feeding back by the water-cooled time of regulating feedback cooling control zone.
According to hot strip rolling cooling means of the present invention, described hot strip rolling cooling means is by adopting segmentation method flexibly to the band steel on the laminar flow cooling roller bed, thus, method of the present invention not only can be controlled freely to the head and tail temperature of band steel, in addition, method of the present invention also can be carried out length control freely to band steel toe tail length.
Claims (7)
1. hot strip rolling cooling means, tie up to TEMPERATURE FOR HOT STRIP LAMINAR cooling traffic coverage point for measuring temperature is set, computer-controlled feedback and cooling water thermoregulating system, it is characterized in that, respectively in the finish rolling exit, batch the porch, and on the laminar flow cooling roller bed as the mid portion of cooling device temperature measurer and sensory feedback device are set, to the band steel toe, the temperature difference of the coiling temperature of tail and middle part coiling temperature detects respectively, after the feedback, the target coiling temperature is set, promptly, middle part coiling temperature and corresponding middle air cooling time, according to this target coiling temperature, temperature to the laminar cooling water of this three section is regulated control
The band steel is cooled to medium temperature from finishing temperature earlier with the cooldown rate that requires, require to carry out the water-cooled second time according to cooldown rate through the air cooling that requires again after time, promptly, form the segmentation refrigerating mode of water-cooled-air cooling-water-cooled, described segmentation refrigerating mode comprises that in proper order first forces cooling section, common cooling section, second to force cooling section and meticulous cooling section
The adjustment control of described laminar cooling water to band steel toe portion, system offers control system according to the thickness of band steel with the segment length who determines every block of band steel, whenever moving a segment length, the band steel just produces a segment number, be designated as: NO.1, NO.2 ... NO.n, control system will be with steel to move a segment length in the time, at three measurement points, it is the finish rolling exit, batch the porch, and send laminar cooling system as after the several times measured value of the every bit of the measurement point on the laminar flow cooling roller bed of the mid portion of cooling device and the band steel segment number coupling by this point, realize the tracking control of laminar flow cooling
For different belt steel thickness, band steel segment length is specific as follows:
In addition, forcing with back, meticulous cooling zone an air cooling zone that does not have the water spray valve is arranged respectively between the cooling zone, the adjusting of the coolant water temperature of described cooling facility for laminar flow is undertaken by the aperture of selecting the water spray collector, and aperture comprises standard-sized sheet, opens 1/2,1/4 and 1/3.
2. hot strip rolling cooling means as claimed in claim 1, it is characterized in that, the temperature of the laminar cooling water of described band steel toe, tail and middle part three sections is regulated control to be respectively: interlude equals the target coiling temperature, head sections is greater than 20～50 ℃ of target coiling temperatures, and end segment is greater than 20～40 ℃ of target coiling temperatures.
3. hot strip rolling cooling means as claimed in claim 1 is characterized in that, the maximum water supply capacity of described laminar flow cooling is between 36000-40000m3/h.
4. hot strip rolling cooling means as claimed in claim 1 is characterized in that, requires as follows to the cooling that relates to each section: (1) first forces cooling section: require cooling length between 18-22 rice, satisfy the requirement of 300 ℃ of maximum temperature declines; (2) common cooling section: require length between 18-25 rice, owing to have certain air cooling zone in its position, its length requirement is about 6-10 rice, so its corresponding cooling capacity is roughly about 30-50 ℃; (3) second force cooling section: cooling length satisfies maximum temperature and descends 300 ℃ between 40-45 rice; (4) meticulous cooling section: to the temperature of the carrying out laminar flow cooling back band steel adjustment that becomes more meticulous, its length is at 12-18 rice, and its cooling capacity is about 30-50 ℃.
5. hot strip rolling cooling means as claimed in claim 1 is characterized in that, control requires as follows for the temperature difference: (1) strip finishing temperature is generally at 830～870 ℃; (2) the band steel at first is cooled to medium temperature with certain cooling velocity, promptly 650 ℃～750 ℃; (3) keep certain air cooling time, 3～20 seconds then; (4) the band steel is cooled to martensite phase transformation district subsequently with the cooldown rate of 80 ℃/s-95 ℃/s.
6. hot strip rolling cooling means as claimed in claim 1, it is characterized in that, the cooling facility for laminar flow of the pressure cooling that is provided with in the 30-34m scope that the adjustment control of described laminar cooling water to band steel afterbody is risen by finish rolling end machine roller carries out, described cooling device is made up of intensive cooling manifold 12-24, the adjustment control of described laminar cooling water to band steel toe portion is undertaken by the meticulous cooling device of laminar flow that is provided with in the distance crimping roller 30-34m of the place scope, the meticulous cooling device of described laminar flow is made up of 8-12 group cooling manifold, and all the other mid portions are undertaken by the cooling device of zone line.
7. hot strip rolling cooling means as claimed in claim 1 is characterized in that, described TEMPERATURE FOR HOT STRIP LAMINAR cooling traffic coverage is 140-160m from planishing roll to the siding-to-siding block length that batches the porch promptly.
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