CN103894425A - Control method and device of finish rolling temperature - Google Patents
Control method and device of finish rolling temperature Download PDFInfo
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- CN103894425A CN103894425A CN201310750002.8A CN201310750002A CN103894425A CN 103894425 A CN103894425 A CN 103894425A CN 201310750002 A CN201310750002 A CN 201310750002A CN 103894425 A CN103894425 A CN 103894425A
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Abstract
The invention discloses a control method of finish rolling temperature, and belongs to the field of control over the finish rolling temperature of hot rolling strip steel. The control method of the finish rolling temperature comprises the steps that belt penetrating speed and the finish rolling temperature of the head of the strip steel are controlled by adjusting the flow amount of water in a machine frame; in an FDTC-1 mode of the finish rolling temperature, a finish rolling speed reduction function is achieved, and the finish rolling temperature is controlled by controlling acceleration; a burst function is put into use, the speed, time and distance of the strip steel in the rolling process are forecast under the burst function, and a forecast result is sent to a coiling temperature model to carry out coiling temperature control. The invention further discloses another control method and device of the finish rolling temperature. The control method and device of the finish rolling temperature provide diversified control modes for the finish rolling temperature, meet high requirements for rolling stability, temperature control precision and mechanical property stability of different products such as thin strip steel and silicon steel, reduce scrap steel and tail swing on site, improve the machine-hour yield, improve control precision of the finish rolling temperature and the rolling temperature, and stabilize quality of products.
Description
Technical field
The invention belongs to hot-strip finishing temperature control field, particularly the control method of finishing temperature and device.
Background technology
In hot-strip production process, the direct influence of rolled power of finishing temperature control and the setting of sharing of load and the precision of fine-rolling strip steel exit thickness, also have material impact to the structure property of hot-strip product; Finishing temperature control model not only directly affects finishing temperature control accuracy simultaneously, also affect finish rolling mill speed, finish rolling entrance head and tail temperature temperature drop, finish rolling rolling stability, finish rolling rolling time, when affecting product quality, output while affecting finish rolling rolling stability and machine.Exploitation and the application of finishing temperature diversification control model, meet the different demands of different steel grades, when ensureing on-the-spot rolling stability, and output while improving machine.
The control model of finishing temperature is respectively FDTC-1 and FDTC-2, ensure finishing temperature by controlling cooling water between the acceleration of finish rolling rolling and frame respectively, but because current major product is thin gauge strip, non-orientation silicon steel and high name oriented silicon steel, kind and process system complexity are various, finish rolling needs low speed threading, high-speed rolling, low speed is thrown steel, ensure threading stability, improve finish rolling mill speed, shorten finish rolling rolling time, improve band steel afterbody finish rolling inlet temperature, low speed is thrown steel minimizing afterbody and is rolled rotten, whipping, ensureing on the stable basis of rolling simultaneously, the control accuracy that ensures as far as possible finishing temperature becomes one of main brainstorm project of two hot rollings.But traditional finishing temperature control model can not meet on-the-spot demand.
As mentioned above, the finishing temperature control model that adapts to dissimilar product is different, only traditional finishing temperature control model cannot meet the high request of different product finishing temperature control accuracy and finish rolling rolling stability simultaneously, therefore under traditional finishing temperature control model, require and feature according to the difference of different product type, development and application finishing temperature diversification control model becomes one of an urgent demand.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of control method of finishing temperature, for meeting the requirement of different product finishing temperature control accuracy and finish rolling rolling stability.
The control method that the invention provides a kind of finishing temperature, comprising:
By the mode control threading speed and band steel head finishing temperature of water adjust flux between frame; Under the finish rolling outlet temperature control FDTC-1 of finishing temperature control model, drop into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature; The burst function that comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and a result for prediction is sent to coiling temperature model, carry out coiling temperature control.
The present invention also provides a kind of control device of finishing temperature, comprising:
Head temperature control device, for the mode control threading speed by water adjust flux between frame and band steel head finishing temperature;
Acceleration control unit, under the finish rolling outlet temperature control FDTC-1 control model in finishing temperature, drops into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature;
Coiling temperature control apparatus, for the burst function that comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and a result for prediction is sent to coiling temperature model, carry out coiling temperature control.
The invention provides finishing temperature diversification control model, meet the high request of thin gauge strip, silicon steel different product rolling stability and temperature control precision and stable mechanical performance, while reducing steel scrap in site, whipping, raising machine when output, improve finishing temperature and control precision of coiling temperature, stabilized product quality.
Brief description of the drawings
The control method flow chart of the finishing temperature that Fig. 1 provides for the embodiment of the present invention;
The control device structure chart of a kind of finishing temperature that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
The embodiment of the present invention provides a kind of finishing temperature diversification control model, meet the high request of thin gauge strip, silicon steel different product rolling stability and temperature control precision and stable mechanical performance, while reducing steel scrap in site, whipping, raising machine when output, improve finishing temperature and control precision of coiling temperature, stabilized product quality.
The control method flow chart of the finishing temperature that Fig. 1 provides for the embodiment of the present invention, comprises the following steps:
Step 101, the mode control threading speed of passing through water adjust flux between frame and band steel head finishing temperature.
Threading speed is stored in online database FPRP(Finishing Product Rolling Practices Table finish rolling product rolling strategy table) table in, automatically selected according to steel grade, thickness and width by control system; Online database FPRP table defines respectively maximum and the minimum of a value of threading speed according to steel grade, thickness and width, for different steel grades, thickness and width, defining optimum threading speed is maximum and minimum of a value, and threading speed is fixed.
Between frame, the water yield of cooling water is stored in online database FSPP(Finishing Spray Product Rolling Practices Table finish rolling aquatic products rolling strategy table) table in, automatically selected according to steel grade, thickness and width by control system; Online database FSPP shows according to steel grade, thickness and width, and the maximum of discharge and minimum of a value between frame while defining threading respectively according to fixing threading speed, regulate the flow of cooling water between frame, thereby ensure finish rolling outlet temperature function.
It is taking finish rolling inlet temperature as basis that band steel head finishing temperature is calculated, on the basis of fixing threading speed, between computer rack, discharge hour, the finishing temperature reaching, according to the finishing temperature of calculating under discharge between fixing threading speed, minimum frame and the deviation of target temperature, between maximum/minimum frame, in range of flow, adjust the flow of water between frame, to ensure that the finishing temperature of calculating is within target finishing temperature scope.
For dropping into this function as the cold rolling material of variety steel transition material, thereby ensure under same steel grade, the different tapping temperatures of thickness, the stability of finish rolling threading speed and mill speed, for the control of finishing temperature and coiling temperature provides solid foundation, reduces in a large number this type of belt steel temperature and blocks.
Under step 102, finishing temperature FDTC-1 control model, drop into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature.Finishing temperature control refers to temperature controlled processes in whole band steel length, and whole raising with finishing temperature control accuracy in steel length is the target of controlling.Step 101 is for the control of band steel head finishing temperature, and this step is for the finishing temperature control with steel body.The control of head finishing temperature is by supplied materials temperature, target finishing temperature, finish rolling exit thickness and the temperature drop in finish rolling region with steel, determine the speed (threading speed) with steel finish rolling outlet, and the flow of water between frame, thereby the actual finishing temperature that ensures finish rolling outlet is within target finishing temperature scope.After head threading completes, need to select a kind of finishing temperature control model, i.e. FDTC-1, by controlling Acceleration Control finishing temperature, or FDTC-2, by controlling the flow-control finishing temperature of water between frame.
Finishing temperature control is affected by heating furnace watermark seriously, the acceleration range 0～0.2m/s of finish rolling mill speed
2, cannot meet finishing temperature control requirement, finishing temperature height temperature difference fluctuation 30 degree.For improving the uniformity of finishing temperature, drop into finish rolling reduction of speed function.Expand to-0.1～0.2m/s of the acceleration range of finish rolling mill speed
2.Drop into this function for thermally sensitive non-orientation silicon steel, effectively improve finishing temperature control uniformity.
After head finishing temperature has been calculated, be finishing temperature control by the control of model FDTC(finish rolling outlet temperature) model control finishing temperature, the control model of finishing temperature is respectively FDTC-1 and FDTC-2, ensures finishing temperature respectively by controlling cooling water between the acceleration of finish rolling rolling and frame.Step 101 is the control of band steel head finishing temperature, and step 102,103 and 104 is the control of band steel body finishing temperature.After band steel actual measurement finishing temperature is higher than target finishing temperature, FDTC-1 model starts to reduce acceleration to ensure finishing temperature, and in the time that the acceleration calculating is less than 0, band steel starts reduction of speed and ensures finishing temperature.
Finishing temperature FDTC-1 control model is the Acceleration Control finishing temperature that regulates the rolling of finish rolling by model.
Burst function under step 103, FDTC-1 control model comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and a result for prediction is sent to coiling temperature model, to be conducive to coiling temperature control.
Burst(is high to accelerate) function is under finishing temperature control model FDTC-1 pattern, the height after volume machine band carries accelerates function, is the object that improves on-the-spot rolling rhythm or reach fast finishing temperature, after volume machine band carries, adopts and accelerates compared with high acceleration.In the prior art, after this function drops into, coiling temperature model can not receive the actual acceleration with steel, causes coiling temperature control to be guaranteed, and this function also just cannot normally come into operation.
Thin gauge strip, for reaching fast target finishing temperature, under FDTC-1 finishing temperature control model, drop into the high burst of acceleration function, before model is untapped, after dropping into the high burst of acceleration function, finishing temperature control model is failed to give notice coiling temperature control model, cause coiling temperature control to be guaranteed, this function also just cannot normally come into operation.After model development, drop into the high burst of acceleration function, by the control of finishing temperature control model FDTC prior notice coiling temperature CTC(Coiling Temperature Control coiling temperature) model, the data of notice comprise, the flag bit that the high burst of acceleration function drops into, the time of putting into operation, the speed of length and burst function finish time, control model by high speed-up computation model prediction by FDTC, and successfully send to coiling temperature CTC to control model, m-speed-distance when coiling temperature CTC controls the model TVD(Time-Velocity-Distance that acceleration is predicted according to height) control of prediction coiling temperature, thereby guarantee control precision of coiling temperature.
The band steel that is less than or equal to 2mm for thickness, drops into this function, can reach fast target finishing temperature on the one hand, can effectively shorten on the other hand thin specification finish rolling rolling time, ensures finish rolling rolling stability, can ensure control precision of coiling temperature simultaneously.
In addition,, under FDTC-2 control model, according to different steel grade demands and finish rolling temperature drop, balance finishing temperature and finish rolling rolling stability, expand three kinds of different control models, meets different demands.The 101st, for controlling the finishing temperature with steel head, 102,103 and 104 is for controlling the finishing temperature with steel body, and the 102, the 103rd, one of mode of body control finishing temperature, the exploitation of some functions under FDTC-1, the 104th, the exploitation of some functions under body finishing temperature control model FDTC-2.If there is no 101, impact is the head finishing temperature computational accuracy with steel so.Two kinds of body control models of FDTC-1 and FDTC-2, select FDTC-1 still to select FDTC-2, need to according to band steel steel grade and thickness with and be with steel self temperature drop, configure in advance.
Weigh stability according to steel grade demand and finish rolling temperature drop, stability is by following the tracks of and determine on-the-spot rolling situation at the scene.Finishing temperature control accuracy and finish rolling rolling stability are the on-the-spot indexs that needs guarantee, but in the time that two indexs are afoul, ensure finishing temperature control accuracy, on-the-spot rolling stability can be on the hazard, cause steel scrap in site, now, need personnel to weigh, whether need to sacrifice finishing temperature control accuracy, ensure on-the-spot rolling stability, now can select different finishing temperature control models by the configuration of amendment model table, thereby select certain control model to ensure to need that index of guarantee.
Before finishing temperature control FDTC-2 pattern is not optimized, if the input of cooling water meets the demand of FDTC-2 function between frame,, to fix rate of acceleration operation, regulate the flow of cooling water between frame, within ensureing that finishing temperature is controlled at target temperature range.After the optimization of finishing temperature control FDTC-2 pattern, online database FTPRP(Finishing Temperature Product Rolling Practices Table finishing temperature product rolling strategy table) table in, add flag bit, be respectively and ensure finishing temperature and do not ensure two kinds of patterns of finishing temperature, ensure to be divided under finishing temperature pattern and drop between frame water and do not drop into two kinds of patterns of water between frame, respectively by water and finish rolling speed control finishing temperature pattern between adjusting frame.
Online database FTPRP table defines respectively according to steel grade, thickness the flag bit of whether controlling finishing temperature, in control procedure, is automatically selected according to steel grade, thickness by control system; Online database FSPP table defines respectively cooling water maximum stream flow and minimum discharge between flag bit that between F1～F6 frame, whether cooling water drops into, frame according to steel grade, thickness, width, in control procedure, is automatically selected according to steel grade, thickness by control system.
After ensureing the optimization of finishing temperature control model, if the input of cooling water meets the demand of FDTC-2 function between frame, volume machine band carries and adopts high acceleration, high acceleration until after finishing temperature reaches target finishing temperature, adopt fixing little rate of acceleration to accelerate, by controlling cooling water flow control finishing temperature between frame.For the rolling of thickness 2.5～3mm thin gauge strip, in F1, the F2 operation of rolling, drop into cooling water between frame, and the band steel of nothing resonance in the operation of rolling.
After ensureing the optimization of finishing temperature control model, if do not drop into cooling water between frame, volume machine band carries and adopts high acceleration, high acceleration until after finishing temperature reaches target finishing temperature, by controlling finish rolling mill speed control finishing temperature.Be less than 3mm thin gauge strip for thickness, finish rolling temperature drop is large, does not drop into cooling water between frame in the finish rolling operation of rolling, and in the operation of rolling, is prone to the band steel of resonance.
The pattern that does not ensure finishing temperature is in the operation of rolling, does not consider the control of finishing temperature, and the fixing acceleration of always giving according to model table accelerates, until throw steel.This pattern is mainly used in finishing temperature less demanding, and in the operation of rolling, temperature drop is larger end to end, and the band steel that rolling stability is poor improves the rolling temperature that enters finish rolling with steel, ensures the stability of rolling.
Taking the container plate of thickness 1.6mm as example, before finishing temperature control model is untapped, adopt traditional FDTC-1 finishing temperature control model, as shown in Figure 2, threading speed threading with steel with 11m/s, threading completes from being with steel head to go out F7 outlet 30m afterwards with 0.119m/s
2rate of acceleration accelerate, finish rolling rolling time 92s, FET end to end temperature drop 61 spends, band steel reaches target finishing temperature after head 500m, has problems unstable into threading, and band steel head causes steel scrap at cold cover of layer, and because finish rolling entrance afterbody temperature is low, easily whipping.
After the optimization of finishing temperature control model, adopt under FDTC-1 finishing temperature control model, drop into the high burst of acceleration function, threading speed with steel drops to 10m/s by 11m/s, before volume machine band carries, stops accelerating, and at the uniform velocity advances with threading speed, after volume machine band carries, with 0.23m/s
2high rate of acceleration accelerate, the rolling time of finish rolling shortens to 85s by 92s, FET end to end temperature drop is reduced to 55 degree by 61 degree, band steel head is after 350m, reach target finishing temperature, and it is unstable effectively to solve threading, and cold cover problem of head layer, improve finish rolling entrance afterbody temperature and alleviate afterbody whipping problem.
Taking the cold rolling material series of thickness 3.5mmSPHC as example, before finishing temperature control model is untapped, adopt traditional FDTC-2 finishing temperature control model, as other steel grade transition bases, its tapping temperature is from 1100-1300 degree frequent variations, and target finishing temperature is different and different according to customer demand, cause its threading speed from 5.8m/s to 10.5m/s frequent variations, have a strong impact on finishing temperature and control precision of coiling temperature, cold rolling material temperature degree blocks volume and accounts for 50%～60% of all steel grade temperature blockade volumes.
After the optimization of finishing temperature control model, adopt the mode control threading speed and the finishing temperature that drop into water adjust flux between frame, threading speed is fixed on 8m/s, between frame, discharge F1, F2, F3 and F4, in maximum stream flow 60%, regulate between minimum discharge 0, ensure target finishing temperature, after threading speed is fixing, improve control precision of coiling temperature, after finishing temperature control model is optimized and dropped into, cold rolling material temperature degree blocks volume quantity and reduces to 10 volumes by 40 volumes.
The control device structure chart of a kind of finishing temperature that Fig. 2 provides for the embodiment of the present invention, comprising:
Head temperature control device 21, for the mode control threading speed by water adjust flux between frame and band steel head finishing temperature;
Coiling temperature control apparatus 23, for the burst function that comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and a result for prediction is sent to coiling temperature model, carry out coiling temperature control.
In a word, the foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (7)
1. a control method for finishing temperature, is characterized in that, comprising:
By the mode control threading speed and band steel head finishing temperature of water adjust flux between frame; Under the finish rolling outlet temperature control FDTC-1 of finishing temperature control model, drop into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature; The burst function that comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and a result for prediction is sent to coiling temperature model, carry out coiling temperature control.
2. the control method of finishing temperature according to claim 1, is characterized in that, described control threading speed with specifically comprise with the step of steel head finishing temperature:
Online database FSPP shows according to steel grade, thickness and width, and the maximum of discharge and minimum of a value between frame while respectively threading being set regulate the flow of cooling water between frame according to fixing threading speed, ensure finish rolling outlet temperature function;
On the basis of fixing threading speed, the finishing temperature that between computer rack, discharge hour reaches, according to the finishing temperature of calculating under discharge between fixing threading speed, minimum frame and the deviation of target temperature, between maximum/minimum frame, in range of flow, adjust the flow of water between frame, ensure that the finishing temperature of calculating is within target finishing temperature scope.
3. the control method of finishing temperature according to claim 2, is characterized in that, the described step by control Acceleration Control finishing temperature specifically comprises:
Expand to-0.1～0.2m/s of the acceleration range that finish rolling mill speed is set
2, after band steel actual measurement finishing temperature is higher than target finishing temperature, FDTC-1 model starts to reduce acceleration to ensure finishing temperature, and in the time that the acceleration calculating is less than 0, band steel starts reduction of speed and ensures finishing temperature.
4. the control method of finishing temperature according to claim 3, it is characterized in that, the described burst function that comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and the result of prediction is sent to coiling temperature model, the step of carrying out coiling temperature control specifically comprises:
Drop into the high burst of acceleration function, control model by FDTC prior notice coiling temperature CTC, the data of notice comprise, the speed of the flag bit that the high burst of acceleration function drops into, the time of putting into operation, length and burst function finish time, by FDTC by high speed-up computation model prediction, and successfully sending to coiling temperature CTC to control model, coiling temperature CTC controls model and accelerates the TVD prediction coiling temperature control of prediction according to height, thereby ensures control precision of coiling temperature.
5. a control method for finishing temperature, is characterized in that, comprising:
By the mode control threading speed and band steel head finishing temperature of water adjust flux between frame; Under the FDTC-2 of finishing temperature control model, according to different steel grade demands and finish rolling temperature drop, balance finishing temperature and finish rolling rolling stability, expand at least one control model, meets different demands.
6. the control method of finishing temperature according to claim 5, is characterized in that, specifically the comprising of described at least one control model of expansion:
Be respectively and ensure finishing temperature and do not ensure two kinds of patterns of finishing temperature, drop between frame water and do not drop into two kinds of patterns of water between frame ensureing to be divided under finishing temperature pattern, pass through respectively water and finish rolling speed control finishing temperature pattern between adjusting frame.
7. a control device for finishing temperature, is characterized in that, comprising:
Head temperature control device, for the mode control threading speed by water adjust flux between frame and band steel head finishing temperature;
Acceleration control unit, under the finish rolling outlet temperature control FDTC-1 control model in finishing temperature, drops into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature;
Coiling temperature control apparatus, for the burst function that comes into operation, under prediction burst function with steel the speed in the operation of rolling, time and distance, and a result for prediction is sent to coiling temperature model, carry out coiling temperature control.
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| CN113798320A (en) * | 2021-08-19 | 2021-12-17 | 武汉钢铁有限公司 | Method and system for controlling finish rolling speed of strip steel |
| CN113798320B (en) * | 2021-08-19 | 2023-10-31 | 武汉钢铁有限公司 | Strip steel finish rolling speed control method and system |
| CN114798761A (en) * | 2022-03-14 | 2022-07-29 | 邯郸钢铁集团有限责任公司 | Rolling control method aiming at specific heating temperature of hot-rolled plate blank |
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