CN101745549A - Method for controlling steel feeding temperature of band steel of hot strip mill - Google Patents
Method for controlling steel feeding temperature of band steel of hot strip mill Download PDFInfo
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- CN101745549A CN101745549A CN200810044095A CN200810044095A CN101745549A CN 101745549 A CN101745549 A CN 101745549A CN 200810044095 A CN200810044095 A CN 200810044095A CN 200810044095 A CN200810044095 A CN 200810044095A CN 101745549 A CN101745549 A CN 101745549A
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Abstract
A method for controlling steel feeding temperature of band steel of a hot strip mill comprises the working procedures of confirming the speed switching point of the middle roller way; measuring the actual temperature of the intermediate billet of the band steel; and measuring the actual feeding steel temperature of the band steel through the rough rolling mill outlet. The method in the invention is characterized by confirming the speed switching point of the roller way according to the length from the rough rolling outlet to the finish rolling inlet; selecting different running speeds of the middle roller way according to different device commissioning solutions; confirming the steel feeding target temperature (experience data) required by different steel types; calculating and comparing the actual steel feeding temperature; obtaining the operation time of the band steel in normal condition by pre-calculating the temperature in the operation process of the band steel; confirming the operation speed of the band steel in the middle roller way, and switching the speed; controlling the finish rolling inlet temperature of the band steel by controlling and regulating the operation time so that the actual steel feeding temperature meets the steel feeding target temperature requirement, so as to control the steel feeding temperature of the hot strip mill.
Description
Technical field
The present invention relates to metallurgical hot rolling field, specifically, the present invention relates to a kind of band steel of hot strip mill temperature-controlled process, more specifically, the present invention relates to the control method that a kind of continuous hot-rolling mill is positioned at the band steel steel feeding temperature of the last frame of roughing.
Background technology
In the metallurgical industry, the production of CSP coiled sheet comprises following process steps:
Continuous-cast blank---strand heating---blank de-scaling---roughing technology---finish-rolling process---band steel laminar flow cooling technology-batch.
The band steel that finishing mill shuts out adopts corresponding cooling system by band steel laminar cooling system on runout table, the coiling temperature that hot-strip is cooled to stipulate by finishing temperature.The type of cooling of band steel, cooling water inflow are all calculated according to different steel grades, specification, finishing temperature, coiling temperature by computer and are set and control.
As the tandem hot strip mill unit, 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.The steel feeding temperature of band steel is directly connected to the quality of production of product and rolling stability, iron scale defective for example, and there is tangible corresponding relation in its steel feeding temperature with the band steel, and Fig. 7 is the corresponding relation figure of iron scale and temperature.
In Fig. 6, can see that significantly along with the rising of temperature, its thickness that produces iron scale will increase greatly, thereby have influence on the quality of production of final products.For this reason, if can effectively control the steel feeding temperature of band steel, can effectively improve the deformed area temperature of band steel in the operation of rolling, reduce the thickness of iron scale.
In addition, because there is different rolling characteristics in different band steel, for example in the production process of ultra-low-carbon steel, because its phosphorus content is lower, the temperature of its two-phase region is about 890 ℃, in case steel feeding temperature is low excessively, to cause the decline of rolling stability, thus accidents caused generation.
For this reason, existing people studies the band steel of hot strip mill temperature controlling.
For example, be that " 95108943.9 ", denomination of invention are that its disclosed principal character is 1, is to list rolling tropocal wood at multimachine seat hot-rolled band machine in the patent application technology of " temperature-controlled process during hot-rolled band is rolling " at number of patent application; 2, when wearing band, control method of temperature, its temperature is controlled by the band cooling.Its key technology is, the band steel cools off the band steel before entering single milling train or mill train, and when the support of band steel by hot-rolled band machine row/single milling train, according to the thermal constant of inlet temperature the intensity of cooling of band between end to end controlled.
And for example, the patent No. is that " CN02132974.5 ", denomination of invention disclose a kind of control method with the aluminium mill roll-gap for the granted patent of " control method of band aluminium mill roll-gap ", its key technology is by process computer finish rolling inlet temperature value, the temperature value of each frame of finish rolling, each frame roll-force value of finish rolling, each the frame gap values between rollers of finish rolling that relates to be calculated, and depresses motor and hydraulic means adjustment roll gap by the PLC adjustment.
Above-mentioned first patent is to force cooling by cooling water, and above-mentioned second patent is by each frame gap values between rollers is calculated, and adjusts by PLC and to depress motor and hydraulic means is adjusted roll gap, carries out temperature control.
As mentioned above, the temperature of band steel was controlled the control method that is or passes through band aluminium mill roll-gap in the past, temperature value, each frame roll-force value of finish rolling, each frame gap values between rollers of finish rolling to finish rolling inlet temperature value, each frame of finish rolling calculate, and depress motor and hydraulic means adjustment roll gap by the PLC adjustment; Or enter before single milling train or the mill train by the band steel band steel is cooled off, and when the support of band steel by hot-rolled band machine row/single milling train, the intensity of cooling between the band head and tail is controlled according to the thermal constant of inlet temperature.All do not relate to control how to pass through the continuous hot-rolling mill steel feeding temperature, come the band steel is controlled in the adjusting of the running time of delay table.
The inventor recognizes: by to the improvement of band steel in the running time of delay table, can play the control to steel feeding temperature.
The inventor recognizes: make full use of the temperature loss of band steel in running, the inlet temperature that relates to is controlled, it is main according to being the temperature of interior intermediate blank control during this period of time from roughing to finish rolling F1 frame, will directly have influence on band steel steel feeding temperature.And the temperature of band steel in this section zone will directly have influence on the control of the steel feeding temperature of band steel.Because there is different rolling characteristics in different band steel, so how to utilize of the steel feeding temperature control of the online temperature instrumentation of present hot rolling to the band steel, the band steel is controlled in the operation of hot rolling delay table, thereby can improve the quality of product and rolling stability, satisfy the requirement that different product is produced.
Summary of the invention
Problem at conventional art exists the objective of the invention is to: a kind of band steel of hot strip mill temperature controlling method is provided, more particularly, the object of the present invention is to provide a kind of control method of continuous hot-rolling mill steel feeding temperature.
The present invention is by the temperature detection to each procedure, thereby obtain the actual temperature of a band steel, the empirical parameter that advances steel with finish rolling compares, pass through simultaneously the temperature precomputation of band steel in running, obtain the band steel running time under the normal condition, last according to different running times, confirm the speed of service system of band steel at delay table, control by running time, adjust, the temperature (finish rolling inlet temperature) that the band steel is entered finish rolling is controlled, thereby solve the unusual problem of finish rolling inlet temperature in course of hot rolling, control the continuous hot-rolling mill steel feeding temperature thus.
For achieving the above object, the technical scheme of the control method of a kind of continuous hot-rolling mill steel feeding temperature of the present invention is as follows.
A kind of control method of continuous hot-rolling mill steel feeding temperature comprises:
Determine the delay table speed switching point between last frame of roughing and finish rolling first frame, the operation that band steel intermediate blank actual temperature between last frame of roughing and finish rolling first frame is measured, and operation to measuring by the actual steel feeding temperature of band steel of roughing mill outlet, it is characterized in that
(1) export to finish rolling this segment length that enters the mouth according to roughing, determine the roller table speed switching point,
(2) pre-select a roller table speed operation system;
(3) export to finish rolling this segment length that enters the mouth according to roughing then, calculate the temperature drop of band steel in this section process;
(4) record the actual steel feeding temperature of band steel that exports by roughing mill, according to above-mentioned temperature drop, the calculating steel feeding temperature of precomputation band steel;
That (5) determines different steel grade requirements advances the steel target temperature, the band steel calculating steel feeding temperature that above-mentioned precomputation is obtained compares with the steel target temperature that advances that described different steel grades require, satisfy into steel bar spare and select into steel, promptly carry out the switching of the delay table speed of service, do not satisfy condition, enter next flow process (6);
(6), reselect delay table speed, and precomputation band steel calculates steel feeding temperature once more as undesirable;
(7) repeat above-mentioned steps 5-6, the band steel calculating steel feeding temperature that obtains until precomputation meets the requirements.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Described speed operation system is as follows:
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 2-8 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine 8-12 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Described switching point is chosen in the 50-75m that is with steel to go out the roughing maximum length and adds the 5-10m place.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The calculating steel feeding temperature of the band steel that described precomputation obtains=actual measurement band steel steel feeding temperature-band steel arrives the temperature drop of finish rolling.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
, when adopting the aligning operation, employing speed operation system 1;
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-6 meter per second 2-4 second,
D: pre-straightening speed: 1.2-1 meter per second 5-10 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine 8-12 second,
Above-mentioned total haulage time is controlled at 50-55 second; Wherein the time before shearing is controlled at 30-35 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 3-5 second,
E: firing rate: 0.8-1 meter per second
F: deceleration: 1-1.2 meter per second
25-10 second,
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine, 8-12 second,
Above-mentioned total haulage time is controlled at 45-48 second; Wherein the time before shearing is controlled at 22-28 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
Speed operating scheme 3 is selected in the preliminary election of the delay table speed of service and the different delay table speeds of service, the selection of time for use, and the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 6-8 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second 8-12 second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine, 8-12 second,
Above-mentioned total haulage time is controlled at 40-44 second, and wherein the time before shearing is controlled at 16-21 second.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
It is as follows to advance steel target temperature setting grade:
| Steel feeding temperature | ＜＝890 | ＜＝900 | ＜＝910 | ＜＝920 | ＜＝930 | ＜＝940 |
| |
1 | 2 | 3 | 4 | 5 | 6 |
| Steel feeding temperature | ＜＝950 | ＜＝960 | ＜＝970 | ＜＝980 | ＜＝990 | ＜＝1000 |
| Grade | 7 | 8 | 9 | 10 | 11 | 12 |
| Steel feeding temperature | ＜＝1010 | ＜＝1020 | ＜＝1030 | ＜＝1040 | ＜＝1050 | ＞1060 |
| Grade | 13 | 14 | 15 | 16 | 17 | 18 |
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The band steel moves at delay table, and promptly the temperature drop of intermediate blank is calculated as follows:
As the input parameter that calculates, be used as the initial temperature of intermediate blank with the roughing outlet temperature;
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop+heat conduction and convection current temperature drop,
Usually, consider that band steel temperature drop=water-cooled temperature drop+radiation temperature drop gets final product.
Radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel thickness temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient is to Temperature Influence,
Water-cooled temperature drop=De-scaling box inlet temperature-De-scaling box outlet temperature.
According to the control method of continuous hot-rolling mill steel feeding temperature of the present invention, the input of intermediate blank temperature computation model comprises intermediate blank thickness, material coefficient, the speed of roller-way, insulation cover coefficient, parameters such as high-pressure water descaling coefficient of utilization.
Described roller table speed coefficient: 0.8-1.1.
Described belt steel thickness temperature coefficient: 0.9-1.2.
Described intermediate blank thickness: 30-70mm, it is to temperature drop influence coefficient: 0.8-1.1.
Material coefficient: to Temperature Influence coefficient 1-1.3.
The insulation cover coefficient: to 8 ℃-15 ℃ of Temperature Influence,
The high-pressure water descaling coefficient of utilization: when not dropping into, temperature drop is at 0 ℃,
When dropping into 1 group, temperature drop is at 18 ℃-25 ℃,
When dropping into 2 groups, temperature drop is at 28 ℃-40 ℃.
For heat conducting calculating, in this numerical procedure, adopted the following upright leaf simplification heat conduction law formula of paying, specific as follows:
In the formula: Q
tThe heat (J) that transmits
λ
tThe thermal conductivity factor of material, the J/ of unit (mm s ℃)
A is perpendicular to the cross-sectional area (mm2) of hot-fluid
Distance on the L direction of heat flow (mm)
The temperature at T ω 1-T ω 2 two ends poor (℃)
Δ t conducts heat the time (s)
The calculating of convection heat transfer' heat-transfer by convection:
In the technical program,, adopt following computing formula to the calculating of convection heat transfer' heat-transfer by convection:
Q
t＝a
tAΔtΔT
In the formula: the heat (J) of Qt exchange
The at surface film thermal conductance, J/ (mm
2.s. ℃).
Interfacial area (mm between A fluid and the solid
2)
The temperature difference of Δ T fluid and solid (℃)
The Δ exchange heat time (s).
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The temperature computation of described intermediate blank is the section of dividing along its length, and section length is divided according to the different thickness of being with steel to go out after the finish rolling.
| Thickness | The segment length |
| ＜4mm | ??0.8-1.2m |
| ＞＝4mm＜7 | ??0.6-0.8m |
| ＞7mm | ??0.5-0.6m |
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The temperature drop of described radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient influence.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
For relatively stable, accurately calculate belt steel temperature, when the temperature control when being used for the delay table speed of service and switching, averaging method is adopted in calculating and control to each section temperature, promptly, adopt segment length's temperature data of the 15%-20% that monoblock band steel begins to average, with this as the temperature controlling principle.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The speed of the delay table after the switching: 0＜speed＜7 meter.
Control method according to continuous hot-rolling mill steel feeding temperature of the present invention is characterized in that,
The following scope of the speed of the delay table after the switching:
The speed of scheme 1: 3.2-4.3m/s,
The speed of scheme 2: 4.3-5.6m/s,
The speed of scheme 3: 5.6-7m/s.
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; Then according to the length of band steel in roughing outlet, the division that averages, for example this band steel is 60m in the length that roughing exports, then, this is with the segment length of steel is the 0.067m/ section.
Calculate the temperature of each section, intermediate blank is calculated the temperature of each layer at the thickness direction higher slice.
The speed of roller-way: 0＜speed＜7 meter, its influence mainly embodies in the running time of delay table by the band steel, in the technical program, its time influence coefficient is 2.6 ℃/S, in this programme, for the friction speed scheme require as follows:
The speed of scheme 1: 3.2-4.3m/s
The speed of scheme 2: 4.3-5.6m/s
The speed of scheme 3: 5.6-7m/s
When relating to the temperature drop of above-mentioned parameter, mainly consider from radiation temperature drop and water-cooled temperature drop:
The temperature drop of radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient influence
Water-cooled temperature drop=De-scaling box inlet temperature-De-scaling box outlet temperature,
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop.
For example, when rolling SPHC (steel grade) band steel (the material coefficient gets 1), the roughing outlet temperature is 1100 ℃ (the belt steel temperature coefficient gets 1), and thickness is 42mm (the thick coefficient of intermediate blank gets 1), and the temperature drop when delay table speed is scheme 2 is calculated as follows:
The * of radiation temperature drop=(120m/5m/s) (2.6 ℃/s*1*1*1*1)-10 ℃=52.4 ℃
When adopting 1 group of de-scaling: (the water-cooled temperature drop is roughly 22 ℃ of time-measured values),
Temperature drop=52.4+22 ℃=74.4 ℃ of band steel,
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1025.6 ℃.
Steel feeding temperature grade with reference to this band steel correspondence is 13 (requiring＜=1010 ℃), can not satisfy steel feeding temperature, and (Fig. 1 7) delay table speed switches to scheme 1 when the band steel arrives switching point, specifically is calculated as follows:
The * of radiation temperature drop=(120m/4m/s) (2.6 ℃/s*1*1*1*1)-10 ℃=78 ℃
When adopting 1 group of de-scaling: (the water-cooled temperature drop is roughly 22 ℃ of time-measured values)
Temperature drop=78+22 ℃=100 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1000 ℃
Satisfy into steel requirement＜=1010 ℃, advance steel.
In addition, in specifically to temperature controlling, in the control of routine, related to controls such as stay-warm case, de-scaling water, tapping temperature, ignored at this.
The present invention is by the temperature detection to each procedure, thereby obtain the actual temperature of a band steel, the empirical parameter that advances steel with finish rolling compares, pass through simultaneously the temperature precomputation of band steel in running, obtain the band steel running time under the normal condition, last according to different running times, confirm the speed of service system of band steel at delay table, control by running time, adjust, the temperature (finish rolling inlet temperature) that the band steel is entered finish rolling is controlled, thereby solve the unusual problem of finish rolling inlet temperature in course of hot rolling, control the continuous hot-rolling mill steel feeding temperature thus.
The simple declaration of accompanying drawing
The roughing that Figure 1 shows that the inventive method exports to finish rolling inlet hot rolling delay table sketch.
Figure 2 shows that the speed operating scheme 1 of the inventive method.
Figure 3 shows that the speed operating scheme 2 of the inventive method.
Figure 4 shows that the speed operating scheme 3 of the inventive method.
Figure 5 shows that the schematic flow sheet of the inventive method.
Fig. 6 is the corresponding relation figure of iron scale and temperature in the hot strip rolling process.
Among the figure, 1 is the last frame of roughing, and 2 are finish rolling first frame, and 3 are the finish rolling de-scaling, and 4 are the finish rolling crop shears, and 5 is middle heater, and 6 is middle straightener, and 7 is switching point, and 8 is temperature measurer.
The specific embodiment
Below, with reference to accompanying drawing, be described more specifically the present invention.
Embodiment:
With the rolling SPHC band of Baogang Stocks Trading Co.'s 1880mm hot rolling mill steel is example:
1. concrete band steel kind and the specification thereof used of embodiment
| Band steel kind | Specification |
| ??SPHC | ??30-70mm |
| ??SS330 | ??30-70mm |
| ??SS400 | ??30-70mm |
| ??ST37-2 | ??30-70mm |
| ??ST44-2 | ??30-70mm |
| ??B380CL | ??30-70mm |
| ??SS490 | ??30-70mm |
| ??SAPH440 | ??30-70mm |
| ??QSTE340TM | ??30-70mm |
| ??QSTE380TM | ??30-70mm |
| ??QSTE420TM | ??30-70mm |
| ??WELTEN590RE | ??30-70mm |
| Band steel kind | Specification |
| ??B20H | ??30-70mm |
| ??30CrMo | ??30-70mm |
| ??30CRMO | ??30-70mm |
| ??B40 | ??30-70mm |
| ??65MN | ??30-70mm |
| ??50MN2V | ??30-70mm |
2. determine that it is 120-140m that roughing exports to finish rolling this segment length that enters the mouth.
3. determine switching point.Switching point is chosen in the 50m that is with steel to go out the roughing maximum length and adds the 10m place.
Referring to 7 among Fig. 1, carry out the switching of speed at this switching point; This segment length generally adds that according to producing line long, the thinnest rolling intermediate slab the surplus of 50-60 rice is definite, and general length is about 120-140 rice; Because the position of switching point must be after the band steel runs to maximum speed, so must determine according to the length of producing line long, the thinnest rolling intermediate slab and the length of delay table.
Switching point is generally determined according to producing line long, the thinnest rolling intermediate slab.Now produce line slab maximum ga(u)ge 250mm, the band steel goes out roughing thickness 50mm, the maximum 10m of slab, and the select tape steel goes out roughing maximum length 50m, the 10m place of the position of this switching point behind 50m.
4. pre-select a roller table speed operation system.
When the band steel does not arrive point for measuring temperature, owing to there is not actual temperature, simultaneously different speed, to make the band steel produce different temperature drops at delay table, so necessary preliminary election delay table speed of service, in the technical program, adopted according to the different equipment scheme that puts into operation, select the different delay table speeds of service, concrete grammar makes: when the equipment for straightening 6 that adopts Fig. 1 is aligned, and employing speed operation system 1, when the middle firing equipment 5 that adopts Fig. 1 carries out the centre heating, employing speed operation system 2, when aligning and middle the heating all the not time spent, employing speed operation system 3.
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-6 meter per second 2-4 second,
D: pre-straightening speed: 1.2-1 meter per second 5-10 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine 8-12 second,
Above-mentioned total haulage time is controlled at 50-55 second; Wherein the time before shearing is controlled at 30-35 second.
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 3-5 second,
E: firing rate: 0.8-1 meter per second
F: deceleration: 1-1.2 meter per second
25-10 second,
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine, 8-12 second,
Above-mentioned total haulage time is controlled at 45-48 second; Wherein the time before shearing is controlled at 22-28 second.
Speed operating scheme 3, the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 6-8 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second 8-12 second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine, 8-12 second,
Above-mentioned total haulage time is controlled at 40-44 second, and wherein the time before shearing is controlled at 16-21 second.
5. determine into steel target temperature grade,
| Steel feeding temperature | ＜＝890 | ＜＝900 | ＜＝910 | ＜＝920 | ＜＝930 | ＜＝940 |
| |
1 | 2 | 3 | 4 | 5 | 6 |
| Steel feeding temperature | ＜＝950 | ＜＝960 | ＜＝970 | ＜＝980 | ＜＝990 | ＜＝1000 |
| Grade | 7 | 8 | 9 | 10 | 11 | 12 |
| Steel feeding temperature | ＜＝1010 | ＜＝1020 | ＜＝1030 | ＜＝1040 | ＜＝1050 | ＞1060 |
| Grade | 13 | 14 | 15 | 16 | 17 | 18 |
6. the intermediate blank segment length divides
Segment length's division is specific as follows: according to the different thickness of being with after steel goes out finish rolling, divide.(following data are the experience time, mainly determine according to the speed of band steel operation) specific as follows;
| Thickness | The segment length |
| ??＜4mm | ??0.8-1.2m |
| ??＞＝4mm＜7 | ??0.6-0.8m |
| Thickness | The segment length |
| ??＞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 900 sections; Then according to the length of band steel in roughing outlet, the division that averages, for example this band steel is 60m in the length that roughing exports, then, this is with the segment length of steel is the 0.067m/ section).Described segment length's division is used for the actual steel feeding temperature of band steel is carried out more accurate measurements and calculations.
7. calculate actual steel feeding temperature.
By the temperature measurer (8 among Fig. 1) of roughing mill outlet, the actual steel feeding temperature of band steel is measured.
8. calculate the temperature drop of band steel, thus the calculating steel feeding temperature of precomputation band steel.
In this programme, consider that material is not have under the condition of phase transformation or chemistry reflection when temperature descends:
When relating to the temperature drop of above-mentioned parameter, mainly consider from radiation temperature drop and water-cooled temperature drop:
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop
The temperature drop of radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient influence.
When rolling SPHC (steel grade) band steel (the material coefficient gets 1), the roughing outlet temperature is 1100 ℃ (the belt steel temperature coefficient gets 1), thickness is 42mm (the thick coefficient of intermediate blank gets 1), and described roller table speed coefficient gets 1, and the temperature drop when delay table speed is scheme 2 is calculated as follows:
The * of radiation temperature drop=(120m/5m/s) (2.6 ℃/s*1*1*1*1)-10 ℃=52.4 ℃.
When adopting 1 group of de-scaling:
Temperature drop=52.4+22 ℃=74.4 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1025.6 ℃.
Steel feeding temperature grade with reference to this band steel correspondence is 13 (requiring＜=1010 ℃), can not satisfy steel feeding temperature, and delay table speed switches to scheme 1 when the band steel arrives switching point, specifically is calculated as follows:
The * of radiation temperature drop=(120m/4m/s) (2.6 ℃/s*1*1*1*1)-10 ℃=78 ℃
When adopting 1 group of de-scaling:
Temperature drop=78+22 ℃=100 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1000 ℃
Satisfy into steel requirement＜=1010 ℃, advance steel.
In addition, in specifically to temperature controlling, in the control of routine, related to controls such as stay-warm case, de-scaling water, tapping temperature, ignored at this.
9. will calculate steel feeding temperature and advance the steel target temperature relatively, and satisfy into steel bar spare and select into steel
When rolling SPHC (steel grade) band steel (the material coefficient gets 1), the roughing outlet temperature is 1100 ℃ (the belt steel temperature coefficient gets 1), thickness is 42mm (the thick coefficient of intermediate blank gets 1), and described roller table speed coefficient gets 1, and the temperature drop when delay table speed is scheme 2 is calculated as follows:
The * of radiation temperature drop=(120m/5m/s) (2.6 ℃/s*1*1*1*1)-10 ℃=52.4 ℃
When adopting 1 group of de-scaling:
Temperature drop=52.4+22 ℃=74.4 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1025.6 ℃
The steel feeding temperature grade not corresponding with reference to this one-tenth is 13 (requiring＜=1010 ℃), can not satisfy steel feeding temperature, and when the band steel arrived switching point, delay table speed switched to scheme 1, specifically is calculated as follows:
The * of radiation temperature drop=(120m/4m/s) (2.6 ℃/s*1*1*1*1)-10 ℃=78 ℃
When adopting 1 group of de-scaling:
Temperature drop=78+22 ℃=100 ℃ of band steel
Steel feeding temperature=roughing outlet temperature-band steel temperature drop=1000 ℃
Satisfy into steel requirement＜=1010 ℃, advance steel.
10. carry out the switching of the delay table speed of service at switching point.
The velocity interval of the delay table after the switching: 0＜speed＜7 meter.
More specifically, the velocity interval of the delay table after the switching:
The speed of scheme 1: 3.2-4.3m/s,
The speed of scheme 2: 4.3-5.6m/s,
The speed of scheme 3: 5.6-7m/s.
The present invention is by the temperature detection to each procedure, thereby obtain the actual temperature of a band steel, the empirical parameter that advances steel with finish rolling compares, pass through simultaneously the temperature precomputation of band steel in running, obtain the band steel running time under the normal condition, last according to different running times, confirm the speed of service system of band steel at delay table, control by running time, adjust, the temperature (finish rolling inlet temperature) that the band steel is entered finish rolling is controlled, thereby solve the unusual problem of finish rolling inlet temperature in course of hot rolling, control the continuous hot-rolling mill steel feeding temperature thus.The present invention can effectively solve the quality of production of product and rolling stability, has the prospect of using widely.
Claims (13)
1. the control method of a continuous hot-rolling mill steel feeding temperature comprises:
Determine the delay table speed switching point between last frame of roughing and finish rolling first frame, the operation that band steel intermediate blank temperature between last frame of roughing and finish rolling first frame is measured, and operation to measuring by the actual steel feeding temperature of band steel in roughing mill exit, it is characterized in that
(1) exports to finish rolling this segment length that enters the mouth according to roughing, determine the roller table speed switching point;
(2) pre-select a roller table speed operation system;
(3), calculate the temperature drop of band steel in this section process then according to roughing exit to finish rolling this segment length that enters the mouth;
(4) record the actual steel feeding temperature of band steel by the roughing mill exit, according to the band steel from enter the mouth temperature drop on this segment length of roughing exit to finish rolling, the calculating steel feeding temperature of precomputation band steel:
Calculate the temperature drop of the steel feeding temperature=actual steel feeding temperature of roughing exit band steel-band steel on the delay table that roughing exit to finish rolling enters the mouth;
That (5) determines different steel grade requirements advances the steel target temperature, the band steel calculating steel feeding temperature that above-mentioned precomputation is obtained compares with the steel target temperature that advances that described different steel grades require, satisfy into steel bar spare and select into steel, promptly carry out the switching of the delay table speed of service, do not satisfy condition, enter next step (6);
(6) as undesirable, reselect delay table speed, and the calculating steel feeding temperature of precomputation band steel once more;
(7) repeat above-mentioned steps 5-6, meet the requirements until the calculating steel feeding temperature of precomputation band steel.
2. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 1 is characterized in that,
Described speed operation system is as follows:
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 2-8 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine 8-12 second.
3. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 1 is characterized in that, described switching point is chosen in the 50-75m that is with steel to go out the roughing maximum length and adds the 5-10m place.
4. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 2 is characterized in that, when adopting the aligning operation, and employing speed operation system 1;
Speed operating scheme 1, that is, the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: the 3.0-4.2 meter per second, 10 seconds-21 seconds,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-6 meter per second 2-4 second,
D: pre-straightening speed: 1.2-1 meter per second 5-10 second,
E: firing rate: 0.8-1 meter per second 5-10 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine 8-12 second,
Above-mentioned total haulage time is controlled at 50-55 second; Wherein the time before shearing is controlled at 30-35 second.
5. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 2, it is characterized in that, the selection of the preliminary election of the delay table speed of service and different delay table speed of service time, select speed operating scheme 2 in the middle of adopting during heating for use, the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second,
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 3-5 second,
E: firing rate: 0.8-1 meter per second
F: deceleration: 1-1.2 meter per second
25-10 second,
G: shear rate: 0.8-1 meter per second
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine, 8-12 second,
Above-mentioned total haulage time is controlled at 45-48 second; Wherein the time before shearing is controlled at 22-28 second.
6. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 2, it is characterized in that, the preliminary election of the delay table speed of service and the different delay table speeds of service, the selection of time, when aligning and middle heating all not the time spent select speed operating scheme 3 for use, the speed of this each section of scheme, time control range are as follows:
A, roughing synchronizing speed: 3.0-4.2 meter per second 10-21 second
B, acceleration: 1-1.2 meter per second
2
C, transfer rate: 5.5-7 meter per second 6-8 second,
F: deceleration: 1-1.2 meter per second
2
G: shear rate: 0.8-1 meter per second 8-12 second,
H: de-scaling speed: 1-1.2 meter per second 8-12 second,
I: finish rolling synchronizing speed: roll first gantry speed by current band aluminium and determine, 8-12 second,
Above-mentioned total haulage time is controlled at 40-44 second, and wherein the time before shearing is controlled at 16-21 second.
7. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 1 is characterized in that, it is as follows to advance steel target temperature setting grade:
8. as the control method of claim 1 or 4 described continuous hot-rolling mill steel feeding temperatures, it is characterized in that the band steel is calculated as follows at the temperature drop of delay table operation:
As the input parameter that calculates, be used as the initial temperature of intermediate blank with the roughing outlet temperature;
Band steel temperature drop=water-cooled temperature drop+radiation temperature drop,
The temperature drop of radiation temperature drop=(speed of roller-way length/roller-way) * (the thick coefficient * of 2.6 ℃/roller table speed coefficient * belt steel temperature coefficient * intermediate blank material coefficient)+insulation cover coefficient influence,
Wherein, described roller table speed coefficient: 0.8-1.1, described belt steel temperature coefficient: 0.9-1.2, described intermediate blank thickness coefficient: 0.8-1.1, described material coefficient: 1-1.3,
Water-cooled temperature drop=De-scaling box inlet temperature-De-scaling box outlet temperature.
9. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 8 is characterized in that, 8 ℃-15 ℃ of the temperature drops of insulation cover coefficient influence.
10. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 8 is characterized in that,
The section that the temperature of described intermediate blank is divided is along its length calculated, and described segment length divides according to the different thickness that the band steel goes out after the finish rolling.
11. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 1 or 2, it is characterized in that, when the temperature control when being used for the delay table speed of service and switching, averaging method is adopted in calculating and control to each section temperature, that is, adopt segment length's temperature data of the 15%-20% that monoblock band steel begins to average.
12. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 1 is characterized in that, the speed of the delay table after the switching: 0＜speed＜7 meter.
13. the control method of continuous hot-rolling mill steel feeding temperature as claimed in claim 11 is characterized in that, the following scope of the speed of the delay table after the switching:
The speed of scheme 1: 3.2-4.3m/s,
The speed of scheme 2: 4.3-5.6m/s,
The speed of scheme 3: 5.6-7m/s.
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