CN101972782B - Device and method for cooling intermediate rolled blank of hot rolled strip - Google Patents
Device and method for cooling intermediate rolled blank of hot rolled strip Download PDFInfo
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- CN101972782B CN101972782B CN2010102838960A CN201010283896A CN101972782B CN 101972782 B CN101972782 B CN 101972782B CN 2010102838960 A CN2010102838960 A CN 2010102838960A CN 201010283896 A CN201010283896 A CN 201010283896A CN 101972782 B CN101972782 B CN 101972782B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a device and method for cooling an intermediate rolled blank of a hot rolled strip. The device comprises an upper collecting pipe arranged above roller beds and a lower collecting pipe arranged between the roller beds, wherein the upper collecting pipe and the lower collecting pipe are both provided with nozzles and opening and closing control valves and are connected with a workshop circulating water system through collecting pipe water supply pipelines; and the collecting pipe water supply pipelines are provided with flow control valves. The opening and closing control valves and the flow control valves are controlled by a programmable controller. A plurality of groups of cooling collecting pipes which can be independently controlled to open and close and has smaller flow are arranged between every two roller beds, the intermediate blank is cooled by adopting water jet, and the cooling speed is correspondingly dynamically controlled according to the transmission speed of the intermediate blank. The invention has the advantages of relatively simple structure of the device, low requirement for water quality, good flow stability and high production efficiency, and is convenient to maintain and free of limit of speed raising of a roughing mill and deceleration of throwing steel; rolling mill cooling water is adopted and a single water supply and drainage system is not needed; and grains of the intermediate blank are remarkably refined, and the mechanical property of a steel plate is improved.
Description
Technical field
The invention belongs to steel rolling and produce cooling technology, the cooling device and the cooling means thereof of the rolling intermediate blank of particularly a kind of hot-strip.
Background technology
For improving the intensity and the toughness of steel; Pass through controlled rolling refine austenite crystal grain or increase the inner dislocation movement by slip band of deformed austenite crystal grain; Promptly increase effective grain boundary area; The ferrite forming core provides nucleation site more, that more disperse during for phase transformation, obtains ferrite and the pearlite or the bainite structure of tiny dispersion.The refinement ferrite crystal grain can not only improve the intensity of steel, and improves the toughness of steel.Yet traditional controlled rolling theoretical developments has surmounted not three phases controlled rolling technology so far all the time, that is: the austenite recrystallization district is rolling, austenite non-recrystallization district is rolling and α+γ two-phase section is rolling.Because of α+γ two-phase section rolling temperature angle, resistance of deformation is big, considers adverse effect that mill load is brought, and industry practice generally adopts is with the rolling rough rolling step in austenite recrystallization district with the rolling finish rolling stage of austenite non-recrystallization district.This just means that the controlled rolling process must be avoided the part recrystallization zone in the middle of roughing and finish rolling, reduce the negative effect that mixed grain structure brings to mechanical property with maximization.
At present, the method that generally adopts both at home and abroad is to let the steel plate after the roughing treat coldly temperature transmitting the roller-way sky, behind the non-recrystallization district, carries out finish rolling until temperature drop.Steel plate cooling velocity in air is slow, length consuming time, and the milling train rhythm of production is slow, has seriously restricted the business efficiency of Iron and Steel Production.For the hot-rolled strip production line that Coil Box is arranged between roughing mill and the finishing mill, then because delay table length is shorter, intermediate blank cooling scarce capacity causes production efficiency to reduce or specification that can rolling steel grade is restricted.
Patent of invention " hot-strip intermediate blank laminar flow cooling means " (application number: 02144825.6) disclose a kind of hot-strip intermediate blank cooling means; It is characterized in that: mounting layer flow cooling device in the roughing mill exit; Forming length is the laminar flow cooling zone of L; Through calculating the intermediate blank every bit through the time of laminar flow cooling zone and the total time of an intermediate blank process laminar flow cooling zone; According to the steel grade and the specification of intermediate blank, calculate to making this intermediate blank be cooled to the cooling water flow of the temperature that requires, and use cooling facility for laminar flow that intermediate blank is cooled off.
At the hot-strip production field, tighter for the temperature drop requirement of cooling procedure, generally require cooled actual temperature and target temperature to differ within 10 ℃.And present existing hot-strip intermediate blank methods for cooling all is between two roller-ways, to adopt one group of cooler, and its intensity of cooling is excessive, and control accuracy of temperature generally about 20 ℃, is difficult to satisfy above-mentioned requirements.Above-mentioned hot-strip intermediate blank laminar flow cooling means, equipment are comparatively complicated, need outside the workshop He in the workshop, build water tank; And quality of cooling water is had relatively high expectations; Need set up independent water circulation system, cause whole investment bigger, limit its use to a certain extent.
Patent of invention " a kind of intermediate blank cooling system and cooling control technology " (application number/patent No.: 200910104025) disclose a kind of intermediate blank cooling system, it is characterized in that: between roughing mill and finishing mill, aerosol cooling device body is set.Described aerosol cooling device body is made up of top cooling manifold and bottom cooling manifold, and aerial fog nozzle and compressed air hose are installed on the cooling water pipe of top cooling manifold and bottom cooling manifold; The open and close control valve of cooling water pipe and compressed air hose is connected with the control valve station with flow control valve.Near the cooling manifold that the roller-way before and after the milling train, is provided with is controlled intermediate blank aerosol process for cooling through the water smoke control technology that cooling manifold is sprayed.This invention can be used for the Heavy Plate Production line.
At cut deal especially Wide and Thick Slab production field, because the cooling procedure temperature drop very slowly, steel plate thickness direction and width uniformity are controlled characteristics such as difficulty is big, and the realization of controlling cooling to intermediate blank has brought many difficult problems.The intermediate blank cooling system of aerosol methods for cooling recited above, equipment are comparatively complicated, and the cleanliness factor and the pressure control range in gas circuit, water route are had relatively high expectations, and cause whole investment bigger, have limited its use to a certain extent.
Summary of the invention
It is simple relatively to the purpose of this invention is to provide a kind of device manufacturing process; Easy to maintenance; Low to requirements in water quality, flow stability is good, reduces the time of staying temperature of intermediate blank in the middle of roughing and finish rolling; Accelerate rolling rhythm, the cooling device and the cooling means thereof of the rolling intermediate blank of hot-strip of enhancing productivity.
Technical scheme of the present invention is: the cooling device of the rolling intermediate blank of a kind of hot-strip, this device comprise and are installed in roller-way top upper header and are installed in lower collector pipe between the roller-way; Wherein, be equipped with nozzle and open and close control valve on said upper header and the lower collector pipe, and be connected with the workshop circulation through the collector supply channel; On the said collector supply channel flow control valve is set.Said open and close control valve and flow control valve are by Controlled by Programmable Controller.
Another purpose of the present invention provides the cooling means of the cooling device of the rolling intermediate blank of a kind of hot-strip, and concrete steps are following:
Step 1: 24-48 group cooling device is installed on the rollgang of roughing mill outlet, is formed cooled region, will be rolled into thickness by roughing mill is that the intermediate blank of 20～60mm is sent into said cooled region;
Step 2: computer is according to thickness, width, steel grade and the temperature of said intermediate blank, and said intermediate blank requires the temperature computation cooling water inflow that is cooled to;
Step 3: computer is through the switching quantity of Controlled by Programmable Controller open and close control valve and the flow of flow control valve; Last lower collector pipe is implemented impact jet flow to said intermediate blank control cooling; Cooling velocity is controlled at 3～30 ℃/s, reach design temperature after, get into subsequent processing.
Further, said step comprises that also having in the transmission course of intermediate blank in the hot-strip process slows down or quicken changes, and adopts adjustment collector water supply flow and changes the dynamic control that collector opens and closes combine control accuracy and adjustment cooling velocity according to velocity variations.
Described impact jet flow water-cooled but pressure is controlled to be 0.3～1.0MPa.
The invention has the advantages that:
1. because the cooling manifold of dispersed placement is difficult for the surface of steel plate sub-cooled takes place, make steel plate thickness direction cooling raio more even, this advantage is very important for hot-strip.
2. device manufacturing process is simple relatively, and is easy to maintenance, low to requirements in water quality, and flow stability is good.
3. can control cooling manifold switching, that flow is less separately owing between per two roller-ways, arranged many groups, and according to the transmission speed of intermediate blank cooling velocity carried out corresponding dynamic control, the control accuracy of steel billet temperature is improved.
4. the cooling capacity adjusting is more flexible, can adopt adjustment collector water supply flow and change collector to open and close and make up the control accuracy and adjustment cooling velocity that the means that combine are improved the steel plate chilling temperature.
5. implement intermediate blank and control when cooling off, not slowed down by the roughing mill raising speed and limit the production efficiency height with the throwing steel.
6. the remarkable refinement of back intermediate blank crystal grain is cooled off in control, has improved the mechanical property of steel plate.
To quality of cooling water require lowly, can directly use setting-out in the existing milling train cooling of workshop, the cooling water after the use directly gets into the workshop circulation, need not independent supply and drain water system, greatly reduces the investment of water system.
8. the controlled pressure of setting-out is 0.3～1.0MPa in the impact jet flow cooling, the available pressure wide ranges.
9. intensity of cooling is big, and the utilization rate of cooling water is high.Under identical specific water's condition, it is big to have a heat that the cooling water unit volume of certain pressure takes away, and has strengthened the shared ratio of nucleate boiling heat transfer, and the coefficient of heat transfer is improved, and cooling velocity is fast, especially can satisfy thick specification intermediate blank and require cooling capacity faster.
Method of the present invention can be widely used in the hot-strip production field, and is applied widely, can satisfy the layout needs of different mills.Between thick, finishing mill, adopt and treat all can realize this method on the hot-rolled strip production line of warm roller-way or Coil Box.
Description of drawings
Fig. 1 is the collector arrangement form sketch map of cooling of the present invention (IC) device.
Fig. 2 is provided with the layout sketch map of cooling (IC) device between roughing mill and Coil Box for the present invention.
Fig. 3 is provided with the layout sketch map of intermediate blank control cooling (IC) device between roughing mill and finishing mill for the present invention.
Among the figure:
1. roughing mill 2. cooling devices
3. crop shears 4. finishing mills
5. Coil Box 6. roller-ways
7. upper header 8. lower collector pipe
9. intermediate blank 10. supply channels
11. flow control valve 12. open and close control valves
13. nozzle 14. Programmable Logic Controllers
The specific embodiment
Below in conjunction with accompanying drawing and embodiment technical scheme of the present invention is further specified.
Be illustrated in figure 1 as the cooling device of the rolling intermediate blank of a kind of hot-strip.The upper header 7 of this device is installed in roller-way 6 tops through support, and lower collector pipe 8 is installed between the roller-way 6, is equipped with nozzle 13 and open and close control valve 12 on upper header 7 and the lower collector pipe 8, and is connected with the workshop circulation through collector supply channel 10; Collector supply channel 10 is provided with flow control valve 11; Open and close control valve 12 is connected with Programmable Logic Controller 14 through cable with flow control valve 11; Programmable Logic Controller 14 is connected with the computer of automatic control system through communication cable, and Programmable Logic Controller 14 makes upper header 7 and lower collector pipe 8 evenly spray injection current cooling intermediate blank.
Be illustrated in figure 2 as the present invention is provided with cooling (IC) device between roughing mill and Coil Box layout sketch map.As shown in Figure 2, the transmission roller channel between roughing mill 1 and the Coil Box 5 is provided with cooling device 2, and the transmission roller channel of Coil Box 5 and finishing mill 4 is provided with crop shears 3.
Be illustrated in figure 3 as the present invention is provided with cooling (IC) device between roughing mill and finishing mill layout sketch map.As shown in Figure 3, the transmission roller channel between roughing mill 1 and the finishing mill 4 is provided with cooling device 2 and crop shears 3.
Instance one:
Adopt arrangement form as shown in Figure 3 to implement intermediate blank control cooling with controlled rolling explained hereafter 18.5mm thickness * 80 pipe line steels.48 groups of cooling devices are installed on the rollgang of roughing mill outlet are formed cooled region; Cooling water pressure is 1.0MPa; Rolled by roughing mill earlier former material base is processed the intermediate blank that thickness is 55mm, the intermediate blank temperature is 1030-1050 ℃, at the rolling cooled region of sending into simultaneously; Computer is according to thickness, width, steel grade and the temperature of said intermediate blank; And the target chilling temperature of said intermediate blank calculates cooling water inflow; Control the switching quantity of open and close control valve and the flow of flow control valve through Programmable Logic Controller; Last lower collector pipe is implemented impact jet flow to said intermediate blank control cooling, and cooling velocity is controlled at 3 ℃/s; Velocity-stabilization when the intermediate blank head gets into cooled region need not to reduce cooling manifold; Speed reduced when intermediate blank was thrown steel, and computer is dynamically adjusted collector switching group number according to intermediate blank speed, and intermediate blank is thrown steel section deceleration time, reduced collector group number, passed through cooled region fully up to the intermediate blank afterbody.Intermediate blank gets into subsequent processing-crop and finish rolling after reaching 920～950 ℃ of design temperatures after the cooling.
Instance two:
The IF steel of ferrite rolling explained hereafter 2.0mm thickness adopts arrangement form as shown in Figure 2 to implement intermediate blank control cooling.32 groups of cooling devices are installed on the rollgang of roughing mill outlet are formed cooled region; Cooling water pressure is 0.40MPa; Rolled by roughing mill earlier former material base is processed the intermediate blank that thickness is 22mm, the intermediate blank temperature is 1020-1050 ℃, at the rolling cooled region of sending into simultaneously; Computer is according to thickness, width, steel grade and the temperature of said intermediate blank; And the target chilling temperature of said intermediate blank calculates cooling water inflow; Through the switching quantity of Programmable Logic Controller controlled opening/closing control valve and the flow of flow control valve, last lower collector pipe is implemented impact jet flow said intermediate blank control cooling cooling velocity is controlled at 20 ℃/s; Speed still raise when the intermediate blank head got into cooled region, and computer is dynamically adjusted collector switching group number according to intermediate blank speed, and the intermediate blank increasing speed rolling time period increases collector group number; Speed reduced when intermediate blank was thrown steel, and computer is dynamically adjusted collector switching group number according to intermediate blank speed, and intermediate blank is thrown steel section deceleration time, reduced collector group number, passed through cooled region fully up to the intermediate blank afterbody.Intermediate blank gets into down operation-batch, uncoiling, crop and finish rolling after reaching 840～860 ℃ of design temperatures after the cooling.
Instance three:
Producing 3.0mm weldering bottle steel HP295 adopts arrangement form as shown in Figure 2 to implement intermediate blank control cooling.36 groups of cooling devices are installed on the rollgang of roughing mill outlet are formed cooled region; Cooling water pressure is 0.60MPa; Rolled by roughing mill earlier former material base is processed the intermediate blank that thickness is 32mm, the intermediate blank temperature is 1010-1040 ℃, at the rolling cooled region of sending into simultaneously; Computer is according to thickness, width, steel grade and the temperature of said intermediate blank; And the target chilling temperature of said intermediate blank calculates cooling water inflow; Through the switching quantity of Programmable Logic Controller controlled opening/closing control valve and the flow of flow control valve; Last lower collector pipe is implemented impact jet flow to said intermediate blank control cooling, and cooling velocity is controlled at 30 ℃/s; Speed still raise when the intermediate blank head got into cooled region, and computer is dynamically adjusted collector switching group number according to intermediate blank speed, and the intermediate blank increasing speed rolling time period increases collector group number; Speed reduced when intermediate blank was thrown steel, and computer is dynamically adjusted collector switching group number according to intermediate blank speed, and intermediate blank is thrown steel section deceleration time, reduced collector group number, passed through cooled region fully up to the intermediate blank afterbody.Intermediate blank gets into operation-crop and finish rolling down after reaching 930～950 ℃ of design temperatures after the cooling.
Claims (2)
1. the cooling means of the cooling device of the rolling intermediate blank of hot-strip; This device comprises and is installed in roller-way top upper header (7) and is installed in lower collector pipe between the roller-way (8); Be equipped with nozzle (13) and open and close control valve (12) on said upper header (7) and the lower collector pipe (8), and be connected with the workshop circulation through collector supply channel (10); Flow control valve (11) is set on the said collector supply channel (10), and said open and close control valve (12) and said flow control valve (11) is characterized in that by Programmable Logic Controller (14) control these method concrete steps are following:
Step 1: 24-48 group cooling device is installed on the rollgang of roughing mill outlet, is formed cooled region, will be rolled into thickness by roughing mill is that the intermediate blank of 20 ~ 60mm is sent into said cooled region;
Step 2: computer is according to thickness, width, steel grade and the temperature of said intermediate blank, and said intermediate blank requires the temperature computation cooling water inflow that is cooled to;
Step 3: the switching quantity of computer through the Controlled by Programmable Controller open and close control valve and the flow of flow control valve, said intermediate blank is implemented impact jet flow control cooling, cooling velocity is controlled at 3～30 ℃/s, reach design temperature after, the entering subsequent processing.
2. cooling means according to claim 1 is characterized in that, said impact jet flow water-cooled but pressure is controlled to be 0.3～1.0MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102838960A CN101972782B (en) | 2010-09-15 | 2010-09-15 | Device and method for cooling intermediate rolled blank of hot rolled strip |
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| CN2010102838960A CN101972782B (en) | 2010-09-15 | 2010-09-15 | Device and method for cooling intermediate rolled blank of hot rolled strip |
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| CN101972782A CN101972782A (en) | 2011-02-16 |
| CN101972782B true CN101972782B (en) | 2012-06-06 |
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