CN105251776A - Tracking processing method for band steel on cold tandem mill - Google Patents

Abstract

Disclosed is a tracking processing method for band steel on a cold tandem mill. The tracking processing method comprises the following steps of division of a band steel tracking area, weld joint tracking, a request for a set value, wedge-shaped rolling control and calculation of a shearing position. 9 divided band steel tracking regions are subjected to position setting. After a weld joint enters the tracking area, the operation distance of the weld joint is calculated. Speed selection of the tracking regions and position correction of the weld joint are conducted, and an effective judgment is made to a detection signal of the weld joint. The set value is requested and confirmed before weld joint enters the mill. Wedge-shaped rolling control is conducted. When the length of wedge-shaped rolling reaches a set length, a rolling set value is transitioned to the new set value of the band steel, and then the shearing position is determined according to the conditions of the widths of the parts, in front of the weld joint or behind the weld joint, of the band steel. According to the tracking processing method, the actual position of the band steel on a production line of the cold tandem mill can be tracked accurately, and the faults, of the data error of the set value of the band steel, rolling band breakage, the error of the shearing position, etc., caused by tracking errors of the band steel are effectively avoided. The downtime of a machine set is reduced, and the operation rate of the machine set and the economic benefit of an enterprise are improved.

Description

A kind of Cold tandem mill strip steel tracking processing method

Technical field

The invention belongs to steel rolling automation field, particularly a kind of tracking processing method for Cold tandem mill strip steel.

Background technology

The object of strip tracking is exactly make computer understand material accurate location on a production line and control status thereof at any time, to calculate function starting each relevant function program at the appointed time, various control is carried out to appointment rolled piece, comprise set-point data request, wedge rolling, clipped position calculating etc., thus ensure that production process continuous and automatic runs.Strip tracking controls to be a key technology in cold continuous rolling production process, is the prerequisite guarantee realizing continuous rolling control.Therefore the processing method designing and developing the accurate tracking of Cold tandem mill strip steel position for the stable operation of unit and the raising of production operational availability significant.

Domestic existing Cold tandem mill strip steel tracking technique is all a complete set of from external introduction, does not all clearly state the processing method that Cold tandem mill strip steel is followed the tracks of in existing patent and document.There are two kinds of strip tracking implementations in the prior art: a kind of is the associated trigger function realizing strip tracking calculating and correction and strip tracking in basic automation systems; Another kind is in process computer, realize the calculating of strip tracking and the triggering of correction and correlation function.In process control computer, carry out the delay that strip tracking process exists data communication, therefore strip tracking process in recent years all completes in basic automatization.In Cold tandem mill strip steel tracking technique application process, because optimum configurations is unreasonable, often there will be the faults such as band steel set-point data mistake, rolling broken belt, clipped position mistake, cause production line to run continuously, have a strong impact on unit operation rate.

The processing method that Cold tandem mill strip steel is followed the tracks of all is not clearly stated in existing patent and document, at document " material tracking in tandem mill and implementation method " Wang Yuhua. bao steel technology, 2001, in 2:32-36., unit strip tracking processing method is moved back by the company of describing, and comprises tracing area division, weld joint tracking and the processing method such as position correction, setting value request triggering.But to connect that to move back unit strip tracking processing method and setup parameter inapplicable in Continuous mill train.

Summary of the invention

The present invention aims to provide a kind of accurate tracking that can realize band steel physical location on cold continuous rolling production line; avoid the fault such as band steel set-point data mistake, rolling broken belt, clipped position mistake because strip tracking mistake produces; reduce unit downtime, improve the Cold tandem mill strip steel tracking processing method of unit operation rate.

For this reason, the solution that the present invention takes is:

A kind of Cold tandem mill strip steel tracking processing method, it is characterized in that, welding seam detector is set up respectively after pickling handover region, inlet of rolling mill region, acid cleaning loop exit region and inlet of rolling mill are cut, at each tracing area, a location counter is set, adopt the scan period to be the calculating that the real-time multi-task high speed processor of 1ms carries out tracking data, its concrete strip tracking processing method is:

(1) strip tracking Region dividing

Can only be there are at most 2 band steel in each tracing area, therefore tracing area partition length can not be greater than the minimum length of band steel; According to mechanical equipment installation position and mill speed, be 9 regions by strip tracking Region dividing;

(2) weld joint tracking

After a, weld seam enter tracing area, location counter starts to calculate weld seam range ability, and after weld seam leaves tracing area, location counter resets, and waits for and calculating next time;

Weld seam range ability P:

$P=\mathrm{\ΔL}+P_{0i}={\∫}_{t_0}^{t_i}{V}_i\mathrm{dt}+P_{0i}$

In formula: △ L is the travel distance of band steel in tracing area; P _0ibe i-th tracing area original position; V _ibe i-th tracing area strip speed; t ₀for band steel enters i tracing area moment; t _ifor band steel leaves i-th tracing area moment; Dt derivative time;

B, tracing area speed are selected

Before selecting frame in crossing process, the S roller speed of service is as all tracing area strip speeds; Select coiling machine linear velocity as all tracing area strip speeds in whipping process; In the operation of rolling, tracing area strip speed is chosen as: using entrance S roller linear velocity as pickling cross-connecting area strip speed; Before 1 frame, laser velocimeter detection speed is as inlet of rolling mill district strip speed; After 1 frame, laser velocimeter detection speed is as 1-2 rack areas strip speed; Using the 2 frame linear velocities with advancing slip compensation as 2-3 rack areas strip speed; Using the 3 frame linear velocities with advancing slip compensation as 3-4 rack areas strip speed; Using the 4 frame linear velocities with advancing slip compensation as 4-5 rack areas strip speed; With laser velocimeter detection speed 4-5 rack areas strip speed before 5 frames; After 5 frames, laser velocimeter detection speed is as 5 frames-flying shear district strip speed; Using No. 1 reeling line speed as No. 1 coiling area strip speed; Using No. 2 reeling line speed as No. 2 coiling area strip speeds;

C, position while welding correct

When strip tracking speed employing S roller or roll linear velocity, exist between roll surface and band steel and slide, welding seam detector is adopted to carry out position correction to eliminate this measure error: it is front in position while welding punching that band steel enters production line, corrected by weld detection signal and welding seam detector actual installation position butt welded seam position calculation value; For the false triggering signal of weld measurement, butt welded seam detection signal carries out Effective judgement: arrange the effective district of weld seam signal, just effective at effective district inside weld signal; The effective sector width of pickling handing-over tracing area weld seam signal is set to 4% ~ 5% of tracing area length, the effective sector width of inlet of rolling mill tracing area weld seam is set to 2% ~ 3% of tracing area length, realize the availability deciding seeking hole instrument detection signal by this method, ensure the reliability that weld joint tracking calculates;

(3) setting value request and wedge rolling control

A, setting value request

Before weld seam enters milling train, 25 ~ 30S is to the new belt steel rolling setting value of process control computer request, and ensure new requirement of being with steel set-point data computing time, before weld seam enters milling train, 10 ~ 15S checks whether new belt steel rolling setting value receives;

B, wedge rolling start control

During wedge rolling, namely the mill length be transitioned into steel new belt steel rolling setting value process from current belt steel rolling setting value is wedge length; Wedge shape setting value comprises wedge length setting value and weld seam to wedge-shaped head distance setting value, when wedge-shaped head arrives 1 frame, wedge rolling starts, namely start to 1 frame wedge rolling during wedge-shaped head distance setting value when weld seam is less than weld seam to frame distance, it is identical therewith that 2,3,4,5 frame wedge rollings start control; Between frame, wedge length setting value must be less than adjacent two frame spacings, avoids two frames to carry out the rolling of change specification simultaneously; In wedge rolling process, new belt steel rolling setting value transition amplitude changes according to rolling wedge-shaped length value; After frame wedge rolling starts, strip tracking starts to calculate rolling wedge-shaped length, when rolling wedge-shaped length reaches wedge length setting value, when the wedge rolling of forebay completes; Belt steel rolling setting value transition amplitude factor:

$\mathrm{factor}=\mathrm{int}\left(\frac{n{\∫}_0^t\mathrm{vdt}}{L_{\mathrm{wed}}}\right)\frac{1}{n}$

L _wed-wedge length setting value; Strip speed after V-frame; N-change specification step number, value 10 ~ 20;

When rolling wedge-shaped length reaches wedge length setting value, when the wedge rolling process in forebay terminates, now wedge rolling process rolling setting value is also corresponding is transitioned into new belt steel rolling setting value V _new:

V _wed＝V _old+(V _new-V _old)factor

V _wed-wedge rolling process rolling setting value; V _old---original tape steel rolling setting value; V _newnew belt steel rolling setting value;

(4) clipped position calculates

When weld seam front and rear part strip width is identical, shear at position while welding; When weld seam front and rear part strip width is not identical, shear in ribbon steel distance weld seam 0.8 ~ 1.2m position; Cut command is issued to shear history and completes, and band steel stroke d calculates according to shearing running time:

$d={\∫}_{t_0}^{t_1}\mathrm{vdt}$

T ₀for shearing Startup time; t ₁for having sheared the moment; V is shear history band steel wire speed.

Beneficial effect of the present invention is:

The present invention can realize the accurate tracking with steel physical location on cold continuous rolling production line; effectively avoid the fault such as band steel set-point data mistake, rolling broken belt, clipped position mistake because strip tracking mistake produces; reduce unit downtime, improve unit operation rate.Adopt strip tracking processing method of the present invention, every year can power generating ratio time 80 hours, improve production operational availability nearly 1%, greatly improve the economic benefit of enterprise.

Accompanying drawing explanation

Fig. 1 is position while welding correction principle figure;

Fig. 2 is that wedge shape setting value position divides schematic diagram;

Fig. 3 is the startup control chart of wedge rolling;

Fig. 4 is setting value switching principle figure.

Detailed description of the invention

For 1450mm cold continuous rolling, strip tracking control system adopts Siemens TDC real-time multi-task processor, and welding seam detector is set up respectively after pickling handover region, inlet of rolling mill, acid cleaning loop outlet and inlet of rolling mill are cut, at each tracing area, a location counter is set.Maximum 6 meter per seconds of strip mill entrance velocity, maximum 20 meter per seconds of milling train muzzle velocity.

Cold tandem mill strip steel tracing area is divided into pickling cross-connecting area, 1-2 rack areas, inlet of rolling mill district, 2-3 rack areas, 3-4 rack areas, 4-5 rack areas, 5 frames-flying shear district, No. 1 coiling area, No. 2 coiling areas.The setting of concrete tracing area position is in table 1.

Table 1 tracing area position sets

Tracing area	Starting point (rice)	Terminal (rice)
			Pickling cross-connecting area	0	250
Inlet of rolling mill district	250	253
			1-2 rack areas	253	258.006
2-3 rack areas	258.006	263.012
			3-4 rack areas	263.012	268.018
4-5 rack areas	268.018	273.024
			5 frames-flying shear district	273.024	278.605
No. 1 coiling area	0	6.95
			No. 2 coiling areas	0	6.95

Before selecting frame in crossing process, the S roller speed of service is as all tracing area strip speeds; Select the coiling machine speed of service as all tracing area strip speeds in whipping process.Operation of rolling weld joint tracking speed is selected in table 2:

Table 2 tracking velocity is selected

Tracing area	The speed of service
		Pickling cross-connecting area	Entrance S roller speed
Inlet of rolling mill district	1 breast roller speed
		1-2 rack areas	Laser velocimeter speed
2-3 rack areas	Laser velocimeter speed

3-4 rack areas	With 2 gantry speed of advancing slip compensation
		4-5 rack areas	Laser velocimeter speed
5 frames-flying shear district	Laser velocimeter speed
		No. 1 coiling area	No. 1 coiling speed
No. 2 coiling areas	No. 2 coiling speeds

Certain tracing area inside weld position calculation:

Table 1 is tracing area absolute position P _0ivalue; Table 2 is speed V in tracing area _ivalue; t ₀weld seam arrives certain tracing area moment; t _iweld seam leaves the moment of certain tracing area.

No. 1 welding seam detector is arranged on pickling handover region 243 meters of positions, and welding seam detector signal effective range is set to tracing area length 4%, namely effective at 233 ~ 253 meters of scope inside weld detector signals; No. 2 welding seam detectors are arranged on inlet of rolling mill 251.5 meters of positions, and weld seam signal effective range is set to 2.6% of tracing area length, namely effective at 250.7 ~ 252.3 meters of scope inside weld detector signals.As shown in Figure 1, when welding seam detector detects weld seam, and welding seam calculating position is within the scope of welding seam detector position correction, and the calculating position of butt welded seam is set to the absolute position values of welding seam detector.

Weld seam enters 30S and weld seam before milling train when to arrive before frame 6 (meter per second) * 30 meter position, (second)=180, to the new belt steel rolling set-point data of process control computer request.Process control computer starts after receiving request signal to calculate new belt steel rolling set-point data, and is issued in strip tracking system.Weld seam enters 15S and weld seam before milling train when arriving the front 90 meters of positions of frame, checks whether strip tracking has received new belt steel rolling set-point data.

When crossing weld seam rolling, current belt steel rolling setting value will be transitioned into new belt steel rolling setting value, namely wedge rolling process, and namely the mill length of this process band steel is wedge length.As shown in Figure 2, wedge shape setting value comprises wedge length setting value L _wedwith weld seam to wedge-shaped head distance setting value L _beg.As shown in Figure 3, when wedge-shaped head arrives 1 frame, namely when weld seam is less than weld seam to wedge-shaped head distance setting value to frame distance, 1 frame weld seam rolling starts.2,3,4,5 frame wedge rollings startups control identical therewith.The wedge length setting value of certain frame rolling must be less than frame spacing, avoids two frames to carry out the rolling of change specification simultaneously; The rolling setting value transition amplitude of wedge rolling process band steel changes according to rolling wedge-shaped length value; After frame wedge rolling starts, strip tracking starts to calculate rolling wedge-shaped length, stops calculating when rolling wedge-shaped length reaches setting value.The transient process of rolling setting value as shown in Figure 4 completes by 10 steps, belt steel rolling setting value transition amplitude factor:

$\mathrm{factor}=\mathrm{int}\left(\frac{10*{\∫}_0^t\mathrm{vdt}}{\mathrm{Lwed}}\right)*0.1$

L _wedwedge shape preseting length after-certain frame;

Strip speed after V-certain frame;

1, wedge length setting is respectively 1.85 meters, 2.09 meters, 2.74 meters, 3.59 meters, 4.14 meters before 2,3,4,5 frames and after 5 framves, 4.72, after frame strip steel at entry speed and 1,2,3,4,5 frames, strip speed is respectively 0.81 meter per second, 1.05 meter per seconds, 1.39 meter per seconds, 1.76 meter per seconds, 2.10 meter per seconds, 2.18 meter per seconds.Wedge rolling process rolling setting value changes according to factor:

V _wed＝V _old+(V _new-V _old)*factor

According to vdt calculates flying shear shear history band steel stroke 5.1 meters.Shear in ribbon steel distance weld seam 1 meter of position during width specifications change before and after band steel.Therefore when width specifications is constant, shearing air knife position is first 5.1 meters of weld seam, if finished product is rolled up as ribbon steel clipped position is first 4.1 meters of weld seam during width change specification, if finished product is rolled up as wide flat steel clipped position is first 6.1 meters of weld seam.

Claims (1)

1. a Cold tandem mill strip steel tracking processing method, it is characterized in that, welding seam detector is set up respectively after pickling handover region, inlet of rolling mill region, acid cleaning loop exit region and inlet of rolling mill are cut, at each tracing area, a location counter is set, adopt the scan period to be the calculating that the real-time multi-task high speed processor of 1ms carries out tracking data, its concrete strip tracking processing method is:

(1) strip tracking Region dividing

Can only be there are at most 2 band steel in each tracing area, therefore tracing area partition length can not be greater than the minimum length of band steel; According to mechanical equipment installation position and mill speed, be 9 regions by strip tracking Region dividing;

(2) weld joint tracking

After a, weld seam enter tracing area, location counter starts to calculate weld seam range ability, and after weld seam leaves tracing area, location counter resets, and waits for and calculating next time;

Weld seam range ability P:

$P=\mathrm{\ΔL}+P_{0i}={\∫}_{t_0}^{t_i}{V}_i\mathrm{dt}+P_{0i}$

In formula: △ L is the travel distance of band steel in tracing area; P _0ibe i-th tracing area original position; V _ibe i-th tracing area strip speed; t ₀for band steel enters i tracing area moment; t _ifor band steel leaves i-th tracing area moment; Dt derivative time;

B, tracing area speed are selected

Before selecting frame in crossing process, the S roller speed of service is as all tracing area strip speeds; Select coiling machine linear velocity as all tracing area strip speeds in whipping process; In the operation of rolling, tracing area strip speed is chosen as: using entrance S roller linear velocity as pickling cross-connecting area strip speed; Before 1 frame, laser velocimeter detection speed is as inlet of rolling mill district strip speed; After 1 frame, laser velocimeter detection speed is as 1-2 rack areas strip speed; Using the 2 frame linear velocities with advancing slip compensation as 2-3 rack areas strip speed; Using the 3 frame linear velocities with advancing slip compensation as 3-4 rack areas strip speed; Using the 4 frame linear velocities with advancing slip compensation as 4-5 rack areas strip speed; With laser velocimeter detection speed 4-5 rack areas strip speed before 5 frames; After 5 frames, laser velocimeter detection speed is as 5 frames-flying shear district strip speed; Using No. 1 reeling line speed as No. 1 coiling area strip speed; Using No. 2 reeling line speed as No. 2 coiling area strip speeds;

C, position while welding correct

When strip tracking speed employing S roller or roll linear velocity, exist between roll surface and band steel and slide, welding seam detector is adopted to carry out position correction to eliminate this measure error: it is front in position while welding punching that band steel enters production line, corrected by weld detection signal and welding seam detector actual installation position butt welded seam position calculation value; For the false triggering signal of weld measurement, butt welded seam detection signal carries out Effective judgement: arrange the effective district of weld seam signal, just effective at effective district inside weld signal; The effective sector width of pickling handing-over tracing area weld seam signal is set to 4% ~ 5% of tracing area length, the effective sector width of inlet of rolling mill tracing area weld seam is set to 2% ~ 3% of tracing area length, realize the availability deciding seeking hole instrument detection signal by this method, ensure the reliability that weld joint tracking calculates;

(3) setting value request and wedge rolling control

A, setting value request

Before weld seam enters milling train, 25 ~ 30S is to the new belt steel rolling setting value of process control computer request, and ensure new requirement of being with steel set-point data computing time, before weld seam enters milling train, 10 ~ 15S checks whether new belt steel rolling setting value receives;

B, wedge rolling start control

During wedge rolling, namely the mill length be transitioned into steel new belt steel rolling setting value process from current belt steel rolling setting value is wedge length; Wedge shape setting value comprises wedge length setting value and weld seam to wedge-shaped head distance setting value, when wedge-shaped head arrives 1 frame, wedge rolling starts, namely start to 1 frame wedge rolling during wedge-shaped head distance setting value when weld seam is less than weld seam to frame distance, it is identical therewith that 2,3,4,5 frame wedge rollings start control; Between frame, wedge length setting value must be less than adjacent two frame spacings, avoids two frames to carry out the rolling of change specification simultaneously; In wedge rolling process, new belt steel rolling setting value transition amplitude changes according to rolling wedge-shaped length value; After frame wedge rolling starts, strip tracking starts to calculate rolling wedge-shaped length, when rolling wedge-shaped length reaches wedge length setting value, when the wedge rolling of forebay completes; Belt steel rolling setting value transition amplitude factor:

$\mathrm{factor}=\mathrm{int}\left(\frac{n{\∫}_0^t\mathrm{vdt}}{L_{\mathrm{wed}}}\right)\frac{1}{n}$

L _wed-wedge length setting value; Strip speed after V-frame; N-change specification step number, value 10 ~ 20;

When rolling wedge-shaped length reaches wedge length setting value, when the wedge rolling process in forebay terminates, now wedge rolling process rolling setting value is also corresponding is transitioned into new belt steel rolling setting value V _new:

V _wed＝V _old+(V _new-V _old)factor

V _wed-wedge rolling process rolling setting value; V _old---original tape steel rolling setting value; V _newnew belt steel rolling setting value;

(4) clipped position calculates

When weld seam front and rear part strip width is identical, shear at position while welding; When weld seam front and rear part strip width is not identical, shear in ribbon steel distance weld seam 0.8 ~ 1.2m position; Cut command is issued to shear history and completes, and band steel stroke d calculates according to shearing running time:

$d={\∫}_{t_0}^{t_1}\mathrm{vdt}$

T ₀for shearing Startup time; t ₁for having sheared the moment; V is shear history band steel wire speed.