CN103894425B - The control method of finishing temperature and device - Google Patents
The control method of finishing temperature and device Download PDFInfo
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- CN103894425B CN103894425B CN201310750002.8A CN201310750002A CN103894425B CN 103894425 B CN103894425 B CN 103894425B CN 201310750002 A CN201310750002 A CN 201310750002A CN 103894425 B CN103894425 B CN 103894425B
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Abstract
The invention discloses the control method of a kind of finishing temperature, belong to hot-strip finishing temperature control field, including: the mode being regulated flow by water between frame controls threading speed and strip steel head finishing temperature；Exit temperature at finishing in finishing temperature controls, under FDTC-1 control model, to put into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature；Come into operation burst function, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, carries out oiler temperature control.The invention also discloses the control method of another kind of finishing temperature and device.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 mechanical stability, during minimizing steel scrap in site, whipping, raising machine while yield, improve finishing temperature and control precision of coiling temperature, stabilized product quality.
Description
Technical field
The invention belongs to hot-strip finishing temperature control field, particularly to control method and the device of finishing temperature.
Background technology
In hot-strip production process, finishing temperature control directly affects the setting of roll-force and sharing of load and the precision of fine-rolling strip steel exit thickness, also the structure property of hot-strip product is had material impact；Finishing temperature control precision is not only directly affected by finishing temperature control pattern simultaneously, have an effect on finish rolling mill speed, finish rolling entrance head and tail temperature temperature drop, finish rolling rolling stability, finish rolling rolling time, while affecting product quality, affect yield when finish rolling rolling stability and machine.The exploitation of finishing temperature diversification control model and application, meet the different demands of different steel grade, it is ensured that while on-the-spot rolling stability, improves yield during machine.
The control model of finishing temperature respectively FDTC-1 and FDTC-2, finishing temperature is ensured respectively through the acceleration and interstand cooling water that control finish rolling rolling, but owing to current major product is thin gauge strip, non-orientation silicon steel and the name oriented silicon steel of height, kind is various with process system complexity, finish rolling needs low speed threading, high-speed rolling, low speed throws steel, ensure threading stability, improve finish rolling mill speed, shorten finish rolling rolling time, improve tail part of band steel entry temperature at finishing, low speed is thrown steel minimizing afterbody and is rolled rotten, whipping, ensureing on the basis that rolling is stable simultaneously, one of control accuracy main brainstorm project becoming two hot rollings ensureing finishing temperature as far as possible.But traditional finishing temperature control pattern can not meet the demand at scene.
As mentioned above, the finishing temperature control pattern adapting to dissimilar product is different, only traditional finishing temperature control pattern cannot meet the high request of different product finishing temperature control precision and finish rolling rolling stability simultaneously, therefore under tradition finishing temperature control pattern, different according to different product type require and feature, and development and application finishing temperature diversification control model becomes one of an urgent demand.
Summary of the invention
In view of this, it is an object of the invention to provide the control method of a kind of finishing temperature, for meeting the requirement of different product finishing temperature control precision and finish rolling rolling stability.
The invention provides the control method of a kind of finishing temperature, including:
The mode being regulated flow by water between frame controls threading speed and strip steel head finishing temperature；Exit temperature at finishing in finishing temperature controls, under FDTC-1 control model, to put into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature；Come into operation burst function, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, carries out oiler temperature control.
Present invention also offers the control device of a kind of finishing temperature, including:
Head temperature controls device, and the mode for being regulated flow by water between frame controls threading speed and strip steel head finishing temperature；
Acceleration control unit, for controlling, under FDTC-1 control model, to put into finish rolling reduction of speed function at the exit temperature at finishing of finishing temperature, by controlling Acceleration Control finishing temperature；
Coiling temperature control apparatus, is used for the burst function that comes into operation, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, carries out oiler 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 mechanical stability, during minimizing steel scrap in site, whipping, raising machine while yield, improve finishing temperature and control precision of coiling temperature, stabilized product quality.
Accompanying drawing explanation
The control method flow chart of the finishing temperature that Fig. 1 provides for the embodiment of the present invention；
The control structure drawing of device 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 clearly, 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 mechanical stability, during minimizing steel scrap in site, whipping, raising machine while yield, 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 being regulated flow by water between frame control threading speed and strip steel head finishing temperature.
Threading speed is stored in online database FPRP (FinishingProductRollingPracticesTable finish rolling product rolling strategy table) table, control system automatically select according to steel grade, thickness and width；Online database FPRP table defines maximum and the minima of threading speed respectively according to steel grade, thickness and width, and for different steel grades, thickness and width, the threading speed of definition optimum is maximum and minima, threading speed is fixed.
The water yield of interstand cooling water is stored in online database FSPP (FinishingSprayProductRollingPracticesTable finish rolling aquatic products rolling strategy table) table, control system automatically select according to steel grade, thickness and width；Online database FSPP table is according to steel grade, thickness and width, and the maxima and minima of discharge between frame during definition threading respectively, according to fixing threading speed, the flow regulating interstand cooling water, thus ensureing exit temperature at finishing function.
It is based on entry temperature at finishing that strip steel head finishing temperature calculates, on the basis of fixing threading speed, when between computer rack, discharge is minimum,
The finishing temperature reached, deviation according to the finishing temperature calculated under discharge between fixing threading speed, minimum frame with target temperature, the flow of water between frame is adjusted in range of flow, to ensure that the finishing temperature calculated is within target finishing temperature scope between maximum/minimum frame.
For putting into this function as the cold rolling material of variety steel transition material, thus ensureing under same steel grade, thickness difference tapping temperature, the stability of finish rolling threading speed and mill speed, the control for finishing temperature with coiling temperature provides solid foundation, and a large amount of these type of belt steel temperatures that reduce block.
Under step 102, finishing temperature FDTC-1 control model, put into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature.Finishing temperature control refers to temperature controlled processes on whole strip length, and on whole strip length, finishing temperature control precision improves the target being to control.Step 101 is for strip steel head finishing temperature control, and this step is the finishing temperature control for strip steel body.Head finishing temperature control is by supplied materials temperature, target finishing temperature, finish rolling exit thickness and the strip steel temperature drop in finish rolling region, determine the speed (threading speed) that strip steel finish rolling exports, and the flow of water between frame, thus ensure that actual finishing temperature that finish rolling exports is within target finishing temperature scope.After head threading completes, then need to select a kind of finishing temperature control pattern, 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 seriously affected by heating furnace watermark, the acceleration range 0～0.2m/s of finish rolling mill speed2, it is impossible to meeting finishing temperature control requirement, the finishing temperature height temperature difference fluctuates 30 degree.For improving the uniformity of finishing temperature, put into finish rolling reduction of speed function.The acceleration range of finish rolling mill speed expands to-0.1～0.2m/s2.This function is put into for thermally sensitive non-orientation silicon steel, is effectively improved finishing temperature control uniformity.
After head finishing temperature has calculated, by model FDTC (exit temperature at finishing control and finishing temperature control) model cootrol finishing temperature, the control model of finishing temperature respectively FDTC-1 and FDTC-2, ensures finishing temperature respectively through the acceleration and interstand cooling water controlling finish rolling rolling.Step 101 is strip steel head finishing temperature control, step 102,103 and 104 is strip steel body finishing temperature control.When strip steel surveys finishing temperature higher than after target finishing temperature, FDTC-1 model starts to reduce acceleration to ensure finishing temperature, and when the acceleration calculated is less than 0, strip steel starts reduction of speed to ensure finishing temperature.
Finishing temperature FDTC-1 control model is the Acceleration Control finishing temperature of the rolling being regulated finish rolling by model.
Burst function under step 103, FDTC-1 control model comes into operation, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, to be conducive to oiler temperature control.
Burst (high acceleration) function is under finishing temperature control model F DTC-1 pattern, and volume machine accelerates function with the height after load, is and improves scene rolling rhythm or be rapidly achieved the purpose of finishing temperature, adopts relatively high acceleration to accelerate after volume machine band load.In the prior art, after this function puts into, coiling temperature model can not receive the actual acceleration of strip steel, causes that oiler temperature control cannot be guaranteed, and this function also just cannot normally come into operation.
Thin gauge strip, for being rapidly achieved target finishing temperature, under FDTC-1 finishing temperature control pattern, put into height and accelerate burst function, before model is untapped, putting into height and accelerate after burst function, oiler temperature control model failed to give notice by finishing temperature control model, causing that oiler temperature control cannot be guaranteed, this function also just cannot normally come into operation.After model development, put into height and accelerate burst function, by finishing temperature control model FDTC prior notice coiling temperature CTC (CoilingTemperatureControl oiler temperature control) model, the data of notice include, the high flag bit accelerating burst function input, the time put into operation, the speed of length and burst function finish time, by FDTC Controlling model by high speed-up computation model prediction, and it is successfully sent to coiling temperature CTC Controlling model, the TVD (during Time-Velocity-Distance m-speed-distance) that coiling temperature CTC Controlling model accelerates prediction according to height predicts oiler temperature control, thus ensureing control precision of coiling temperature.
For the thickness strip steel less than or equal to 2mm, put into this function, target finishing temperature can be rapidly achieved on the one hand, can effectively shorten Thin Specs finish rolling rolling time on the other hand, it is ensured that finish rolling rolling stability, control precision of coiling temperature can be ensured simultaneously.
Additionally, 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, meet different demand.101 is the finishing temperature for controlling strip steel head, 102,103 and 104 is the finishing temperature for controlling strip steel body, and 102,103 is one of the mode that body controls finishing temperature, the exploitation of some functions under FDTC-1,104 is the exploitation of some functions under body finishing temperature control model F DTC-2.Without 101, then impact is the head finishing temperature computational accuracy of strip steel.Two kinds of body control models of FDTC-1 and FDTC-2, select FDTC-1 still to select FDTC-2, it is necessary to according to strip steel steel grade and thickness and its strip steel self temperature drop, configure in advance.
Weighing stability according to steel grade demand and finish rolling temperature drop, stability is tracked determining by the scene scene being rolled situation.Finishing temperature control precision and finish rolling rolling stability are the indexs that scene need to ensure, but when two indices is afoul time, namely finishing temperature control precision is ensured, then on-the-spot rolling stability then can be on the hazard, cause steel scrap in site, then now, personnel are then needed to weigh, the need of sacrificing finishing temperature control precision, ensure on-the-spot rolling stability, then now namely can be modified the configuration of model table to select different finishing temperature control patterns, thus selecting certain control model to ensure that index needing to ensure.
Before finishing temperature control FDTC-2 pattern is not optimised, if the input of interstand cooling water meets the demand of FDTC-2 function, then run with fixing rate of acceleration, regulate the flow of interstand cooling water, it is ensured that finishing temperature control is within target temperature range.After finishing temperature control FDTC-2 model-based optimization, in online database FTPRP (FinishingTemperatureProductRollingPracticesTable finishing temperature product rolling strategy table) table, add flag bit, respectively ensure finishing temperature and do not ensure finishing temperature both of which, ensure to be divided under finishing temperature pattern between input frame water and do not put into water both of which between frame, controlling finishing temperature pattern respectively through regulating water and finishing speeds between frame.
Online database FTPRP table defines whether to control the flag bit of finishing temperature respectively according to steel grade, thickness, in control process, control system automatically selects according to steel grade, thickness；Online database FSPP table defines, according to steel grade, thickness, width, flag bit, interstand cooling water maximum stream flow and the minimum discharge whether F1～F6 interstand cooling water puts into respectively, in control process, control system automatically selects according to steel grade, thickness.
After ensureing finishing temperature control model-based optimization, if the input of interstand cooling water meets the demand of FDTC-2 function, volume machine band load adopts height to accelerate, high accelerate until after finishing temperature reaches target finishing temperature, adopt fixing little rate of acceleration to accelerate, control finishing temperature by controlling interstand cooling discharge.For the rolling of thickness 2.5～3mm thin gauge strip, F1, F2 operation of rolling puts into interstand cooling water, and without the strip steel of resonance in the operation of rolling.
Ensureing after finishing temperature control model-based optimization, if not putting into interstand cooling water, volume machine band load adopts height to accelerate, and high accelerates until after finishing temperature reaches target finishing temperature, controlling finishing temperature by controlling finish rolling mill speed.For thickness less than 3mm thin gauge strip, finish rolling temperature drop is big, does not put into interstand cooling water, and easily occur the strip steel of resonance in the operation of rolling in the finish rolling operation of rolling.
Not ensureing that the pattern of finishing temperature is for, in the operation of rolling, being left out the control of finishing temperature, the fixing acceleration always given according to model table accelerates, until throwing steel.This pattern is mainly used in finishing temperature less demanding, and in the operation of rolling, temperature drop is relatively big end to end, and the strip steel that rolling stability is poor improves strip steel and enters the rolling temperature of finish rolling, it is ensured that the stability of rolling.
For the container plate of thickness 1.6mm, before finishing temperature control pattern is untapped, adopting traditional FDTC-1 finishing temperature control pattern, strip steel is with the threading speed threading of 11m/s, and threading completes after i.e. strip steel head goes out F7 outlet 30m with 0.119m/s2Rate of acceleration accelerate, finish rolling rolling time 92s, FET temperature drop 61 degree end to end, strip steel reaches target finishing temperature after head 500m, has problems unstable into threading, and strip steel head causes steel scrap at cold set of layer, and owing to finish rolling entrance tail temperature is low, easy whipping.
After finishing temperature control model-based optimization, adopt under FDTC-1 finishing temperature control pattern, put into height and accelerate burst function, the threading speed of strip steel is dropped to 10m/s by 11m/s, stops accelerating, at the uniform velocity advance with threading speed before volume machine band load, after volume machine band load, with 0.23m/s2High rate of acceleration accelerate, the rolling time of finish rolling is shortened to 85s by 92s, FET temperature drop end to end is reduced to 55 degree by 61 degree, strip steel head is after 350m, reach target finishing temperature, and it is unstable effectively to solve threading, and cold of head layer set problem, improve finish rolling entrance tail temperature and alleviate afterbody whipping problem.
For the cold rolling material series of thickness 3.5mmSPHC, before finishing temperature control pattern is untapped, adopt traditional FDTC-2 finishing temperature control pattern, as other steel grade transition bases, its tapping temperature frequently changes from 1100-1300 degree, and target finishing temperature is different according to customer demand difference, cause that its threading speed frequently changes from 5.8m/s to 10.5m/s, having a strong impact on finishing temperature and control precision of coiling temperature, cold rolling material temperature degree block volume accounts for the 50%～60% of all steel grade temperature block volume.
After finishing temperature control model-based optimization, the mode of water adjustment flow between frame that puts into is adopted to control threading speed and finishing temperature, threading speed is fixed on 8m/s, between frame, discharge F1, F2, F3 and F4 regulate between maximum stream flow 60%, minimum discharge 0, it is ensured that target finishing temperature, after threading speed is fixing, improving control precision of coiling temperature, after finishing temperature control model-based optimization input, cold rolling material temperature degree block volume quantity is reduced to 10 volumes by 40 volumes.
The control structure drawing of device of a kind of finishing temperature that Fig. 2 provides for the embodiment of the present invention, including:
Head temperature controls device 21, and the mode for being regulated flow by water between frame controls threading speed and strip steel head finishing temperature；
Acceleration control unit 22, for controlling, under FDTC-1 control model, to put into finish rolling reduction of speed function at the exit temperature at finishing of finishing temperature, by controlling Acceleration Control finishing temperature；
Coiling temperature control apparatus 23, is used for the burst function that comes into operation, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, carries out oiler temperature control.
In a word, the foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
Claims (4)
1. the control method of a finishing temperature, it is characterised in that including:
The mode being regulated flow by water between frame controls threading speed and strip steel head finishing temperature；Exit temperature at finishing in finishing temperature controls, under FDTC-1 control model, to put into finish rolling reduction of speed function, by controlling Acceleration Control finishing temperature；Come into operation burst function, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, carries out oiler temperature control；The step of described control threading speed and strip steel head finishing temperature specifically includes:
Online database FSPP table, according to steel grade, thickness and width, is respectively provided with during threading between frame the maxima and minima of discharge, regulates the flow of interstand cooling water according to fixing threading speed, it is ensured that exit temperature at finishing function；
On the basis of fixing threading speed, the finishing temperature that between computer rack, discharge reaches time minimum, deviation according to the finishing temperature calculated under discharge between fixing threading speed, minimum frame with target temperature, the flow of water between frame is adjusted within the scope of discharge, it is ensured that the finishing temperature of calculating is within target finishing temperature scope between maximum/minimum frame.
2. the control method of finishing temperature according to claim 1, it is characterised in that the described step by control Acceleration Control finishing temperature specifically includes:
The acceleration range arranging finish rolling mill speed expands to-0.1～0.2m/s2, when strip steel surveys finishing temperature higher than after target finishing temperature, FDTC-1 model starts to reduce acceleration to ensure finishing temperature, and when the acceleration calculated is less than 0, strip steel starts reduction of speed to ensure finishing temperature.
3. the control method of finishing temperature according to claim 2, it is characterized in that, the described burst function that comes into operation, strip steel speed in the operation of rolling, time and distance under prediction burst function, and the result of prediction is sent to coiling temperature model, the step carrying out oiler temperature control specifically includes:
Put into height and accelerate burst function, by finishing temperature control model FDTC prior notice coiling temperature MODEL C TC, the data of notice include, the high flag bit accelerating burst function input, the time put into operation, the speed of length and burst function finish time, by finishing temperature control model FDTC by high speed-up computation model prediction, and it is successfully sent to coiling temperature MODEL C TC, the TVD that coiling temperature MODEL C TC accelerates prediction according to height predicts oiler temperature control, thus ensureing control precision of coiling temperature, wherein said TVD is m-speed-distance when being Time-Velocity-Distance.
4. the control device of a finishing temperature, it is characterised in that including:
Head temperature controls device, and the mode for being regulated flow by water between frame controls threading speed and strip steel head finishing temperature；
Acceleration control unit, for controlling, under FDTC-1 control model, to put into finish rolling reduction of speed function at the exit temperature at finishing of finishing temperature, by controlling Acceleration Control finishing temperature；
Coiling temperature control apparatus, is used for the burst function that comes into operation, it was predicted that strip steel speed in the operation of rolling, time and distance under burst function, and the result of prediction is sent to coiling temperature model, carries out oiler temperature control.
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| C06 | Publication | ||
| PB01 | Publication | ||
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