CN102120224A - Control method of automatic deviation correction during rolling of hot continuous rolling mill - Google Patents

Abstract

The invention relates to the field of deviation correction in hot continuous rolling, in particular to a control method of automatic deviation correction, which comprises the following steps of: 1, controlling the opening of a side guide plate in a strip steel entering state; 2, opening the side guide plate position detection to control roller gap deviation correction; 3, opening the side guide plate pressure detection to control roller gap deviation correction; and 4, controlling the opening of the side guide plate in a strip steel throwing state, closing the side guide plate pressure detection when the tail of the strip steel leaves from a first stand, and entering the control of the opening of the side guide plate until the strip steel completely leaves from a continuous rolling stand. The control method is perfected by using the traditional equipment condition, adopts a positive and effective means for the treatment of deviation, realizes automatic deviation correction on the strip steel, improves the rolling stability, is accurate in control and capable of ensuring the stability of hot rolling production, and has wider popularization value.

Description

The control method of automatic deviation correction when continuous hot-rolling mill is rolling

Technical field

The present invention relates to the correction field in the hot rolling tandem rolling, relate in particular to a kind of control method of automatic deviation correction.

Background technology

In the hot continuous rolling process, the continuous rolling process of band steel is the technique change process of a complexity, and its key relates to the plastic deformation of hot-strip; Because of each chassis equipment state, on the band steel characteristic, all there is certain particularity, the rolled piece of its absolute ideal is non-existent.Even the identical band steel of kind and specification, there are differences as long as have in a certain respect, also will influence the stability of whole continuous rolling process, these differences comprise: be with steel both sides temperature contrast, band steel thickness of two sides difference, band steel both sides template difference or the like, all may cause occurring in the operation of rolling moment sideslip of band steel; Because in the hot rolling process, in a single day sideslip takes place in its mill speed higher (generally more than the 10m/s) in the operation of rolling, will directly have influence on the quality control of follow-up band steel and rolling stability; For solving the sideslip of band steel in the operation of rolling, depend on operative employee's manual control substantially at present.The method that is specifically related to is as follows:

The hand operated control method of the afterbody sideslip of band steel is as follows:

Operating personnel estimate the sideslip situation of band steel in each frame, this frame roll gap leveling button of manual adjustments.When finding the band steel to the transmission side sideslip, regulate the transmission side roll gap and press down, lift on the fore side roll gap, the band steel is moved to fore side.On the contrary, when finding the band steel, regulate the fore side roll gap and press down, lift on the transmission side roll gap, the band steel is moved to transmission side, reach the purpose of control strip running deviation with this to the fore side sideslip.

The shortcoming of sideslip hand operated control method in the operation of rolling of band steel:

1, relies on naked eyes to judge strip running deviation fully, may discover at the initial stage that sideslip takes place hardly, incur loss through delay the disposal time;

2, owing to be with the speed of service of steel fast in the operation of rolling, rely on the reaction time deficiency of control manually fully, will directly influence the rolling stability of follow-up band steel and the control of strip edge portion quality;

3, because belt plate shape and temperature often change, operating personnel are in case carry out leveling according to lastblock band steel, the adjustment that can lead to errors.

Summary of the invention

Technical problem to be solved by this invention provides the control method of a kind of continuous hot-rolling mill automatic deviation correction when rolling, different phase in the operation of band steel in this method is regulated roll gap by Position Control or pressure control respectively, realization has improved rolling stability to band steel automatic deviation correction.

The present invention is achieved in that the control method of automatic deviation correction when a kind of continuous hot-rolling mill is rolling, may further comprise the steps:

Step 1, band steel are gone into the flipper guide aperture control in steel stage, prepare to sting steel in first frame and sting the control that steel is finished stage offside guide plate aperture to a last frame;

Step 2, the correction of open side guide plate position detection control roll gap, in the end a frame starts the flipper guide position probing after stinging steel, by detection side guide plate position deviation, regulates roll gap leveling amount, to strip steel deviation;

Step 3, the correction of open side guide plate pressure detecting control roll gap after band steel toe portion arrives coil of strip, are closed the flipper guide position probing, and open side guide plate pressure detecting by detection side guide plate pressure divergence, is regulated roll gap leveling amount, to strip steel deviation;

Step 4, band steel are thrown the flipper guide aperture control in steel stage, close the flipper guide pressure detecting when the afterbody of band steel leaves first frame, and the control of approaching side guide plate aperture is left the tandem rolling frame fully up to the band steel.

The band steel is gone into the flipper guide aperture control in steel stage in the described step 1, may further comprise the steps:

1) flipper guide aperture segmentation is divided into four-stage to the flipper guide aperture, and the flipper guide actuating quantity of band steel when first frame is stung steel is D1; The flipper guide actuating quantity of band steel when second frame is stung steel is D2; The flipper guide actuating quantity of band steel when in the end a frame is stung steel is D3; The band steel is finished and is with steel and the fixing spacing of flipper guide after wearing of tandem rolling frame is with is D4; Strip width is W;

Control flipper guide aperture=W+D1+D2+D3+D4 when 2) first frame is prepared to sting steel;

3) first frame is controlled flipper guide aperture=W+D2+D3+D4 after stinging steel;

4) second frame is controlled flipper guide aperture=W+D3+D4 after stinging steel;

5) last frame is controlled flipper guide aperture=W+D4 after stinging steel.

Open side guide plate position detection control roll gap correction in the described step 2 may further comprise the steps:

1) obtains the roll gap leveling amount H of flipper guide position deviation amount X and this position deviation amount correspondence by experimental test, production location deviation/roll gap leveling scale lattice;

2) detection side guide plate position deviation amount X, and distinguish,

When flipper guide during to the active side deviation departure be X1, $X1=\frac{\mathrm{\ΣPOSws}}{N}-\mathrm{POSset},$

When flipper guide during to the transmission side deviation departure be X2, $X2=\frac{\mathrm{\ΣPOSds}}{N}-\mathrm{POSset},$

∑ POSws active side position deviation total value;

∑ POSds transmission side position deviation total value;

The N times of collection;

POSset default deviation;

3) by flipper guide position deviation amount, to look into position deviation/roll gap leveling scale lattice and obtain roll gap leveling amount H, and have when flipper guide during to the active side deviation, the active side roll gap presses down; Flipper guide is lifted on the active side roll gap when the transmission side deviation; Regulate roll gap according to roll gap leveling amount H.

Open side guide plate pressure detecting control roll gap correction in the described step 3 may further comprise the steps:

1) obtains the pressure differential P of flipper guide active side and transmission side and the roll gap leveling amount H of this pressure differential correspondence by experimental test, make pressure differential/roll gap leveling scale lattice;

2) the pressure differential P of detection side guide plate active side and transmission side, and distinguish,

When active side pressure during greater than transmission side pressure pressure differential be P1, $P1=\frac{\mathrm{\ΣPws}}{N}-\mathrm{Pset},$

When active side pressure during less than transmission side pressure pressure differential be P2, $P2=\frac{\mathrm{\ΣPds}}{N}-\mathrm{Pset},$

∑ Pws active side position deviation total value;

∑ Pds transmission side position deviation total value;

The N times of collection;

Pset default deviation;

3), look into pressure differential/roll gap leveling scale lattice and obtain roll gap leveling amount H, and when active side pressure was arranged greater than transmission side pressure, the active side roll gap pressed down by flipper guide active side and transmission side pressure differential; Active side pressure is lifted on the active side roll gap during less than transmission side pressure; Regulate roll gap according to roll gap leveling amount H.

The band steel is thrown the flipper guide aperture control in steel stage in the described step 4, may further comprise the steps:

1) the segmentation of flipper guide aperture, the flipper guide aperture is divided into four-stage, the flipper guide actuating quantity D1 of band steel when first frame is stung steel; The flipper guide actuating quantity D2 of band steel when second frame is stung steel; The flipper guide actuating quantity D3 of band steel when in the end a frame is stung steel; The band steel is finished the band back of wearing of tandem rolling frame and is with steel and the fixing space D 4 of flipper guide; Strip width is W;

2) when leaving first frame, the afterbody of band steel controls

Flipper guide aperture=W+D3+D4.

The different phase of moving at the band steel in the control method of automatic deviation correction when continuous hot-rolling mill of the present invention is rolling is regulated roll gap by the control of flipper guide aperture, Position Control or pressure control respectively, realizes band steel automatic deviation correction has been improved rolling stability.And in the control of flipper guide aperture, the aperture of flipper guide has been divided into four-stage, control more accurate; This method has utilized existing appointed condition to improve in conjunction with the sideslip problem of band steel in the operation of rolling, for it sideslip post processing takes place and has adopted active and effective means, and it is stable to guarantee that hot rolling is produced, and has promotional value more widely.

Description of drawings

Fig. 1 is the control method flow chart of continuous hot-rolling mill automatic deviation correction when rolling.

The specific embodiment

Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's statement, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

During the continuous hot-rolling mill rolled band steel, the band steel at first begins to sting steel, and the head of band steel at first penetrates first frame, and the operation back passes the band of wearing of finishing the tandem rolling frame from last frame in the frame of each passage then; Wear band and finish back band steel toe portion and entering into coil of strip and carrying out coil by insulation, cooling, leave first frame with the afterbody of steel at last and enter into and throw the steel stage, after the afterbody of being with steel left last frame, whole piece band steel was finished rolling work.

The control method of automatic deviation correction when a kind of continuous hot-rolling mill is rolling may further comprise the steps:

Step 1, band steel are gone into the flipper guide aperture control in steel stage, prepare to sting steel in first frame and sting the control that steel is finished stage offside guide plate aperture to a last frame; Specifically may further comprise the steps:

1) flipper guide aperture segmentation is divided into four-stage to the flipper guide aperture, the flipper guide actuating quantity D1 of band steel when first frame is stung steel;

D1＝K1*W

K1＝C1*W+B1

Wherein: C1, B1 are empirical coefficient

W is strip width (mm of unit)

C1 value-1/12000 in the present embodiment, B1 value 0.35

When strip width W=600mm, obtain K1=0.3

When strip width W=1800mm, obtain K1=0.2

The flipper guide actuating quantity D2 of band steel when second frame is stung steel;

D2＝K2*W

K2＝C2*W+B2

Wherein: C2, B2 are empirical coefficient

W is strip width (mm of unit)

C2 value-7/120000 in the present embodiment, B1 value 0.255

When strip width W=600mm, obtain K2=0.22

When strip width W=1800mm, obtain K2=0.15

The flipper guide actuating quantity D3 of band steel when in the end a frame is stung steel;

D3＝K3*W

K3＝C3*W+B3

Wherein: C3, B3 are empirical coefficient

W is strip width (mm of unit)

C3 value-3/20000 in the present embodiment, B3 value 0.3

When strip width W=600mm, obtain K3=0.3

When strip width W=1800mm, obtain K3=0.12

The band steel is finished the band back of wearing of tandem rolling frame and is with steel and the fixing space D 4 of flipper guide;

D4＝K1*W

K4＝C4*W+B4

Wherein: C4, B4 are empirical coefficient

W is strip width (mm of unit)

The C4 value 11/60000 in the present embodiment, B4 value 0.61

When strip width W=600mm, obtain K4=0.5

When strip width W=1800mm, obtain K4=0.28

2) owing to consider that the band steel is when entering finish rolling, there is certain camber (head departs from rolling centerline) in head, because there is bigger uncertainty in its departure, so at the special circumstances of being with steel toe portion, adopted bigger flipper guide aperture control scheme, specific as follows:

Control flipper guide aperture=W+D1+D2+D3+D4 when first frame is prepared to sting steel;

3) because the flipper guide of frame is installed in the inlet of frame, when being with steel after first frame is stung steel, relative band steel departure promptly departs from the rolling centerline amount, be subjected to the influence of supplied materials, have some improvement, simultaneously, consider influence downstream frame rolling stability, at this moment, reduce the aperture of flipper guide, decrease is D1

At this moment, flipper guide aperture=W+D2+D3+D4;

4) for reaching the accurate control of flipper guide, after second frame was stung steel, the band steel was subjected to certain force of strain on frame, was with certain stability that had of steel, and for control back segment frame band steel departs from the rolling centerline amount, control flipper guide aperture is adopted and dwindled D2

At this moment, flipper guide aperture=W+D3+D4;

5) for satisfying the stability of band steel in the finish rolling operation of rolling, when last frame is stung steel, the band steel finish the tandem rolling frame wear band after, offside guide plate opening degree reduces D3,

At this moment, flipper guide aperture=W+D4.

Step 2, the correction of open side guide plate position detection control roll gap, in the end a frame starts the flipper guide position probing after stinging steel, by detection side guide plate position deviation, regulates roll gap leveling amount, to strip steel deviation; Specifically may further comprise the steps:

1) obtain the roll gap leveling amount H of flipper guide position deviation amount X and this position deviation amount correspondence by experimental test, production location deviation/roll gap leveling scale lattice, as shown in table 1;

Position deviation	The leveling amount
		＜＝0.2mm	0.02
＝0.21mm	0.025
		＝0.22mm	0.03
＝0.23mm	0.035
		＝0.24mm	0.04
＝0.25mm	0.045
		＝0.26mm	0.05
＝0.27mm	0.055
		＝0.28mm	0.06
＝0.29mm	0.065
		＝0.30mm	0.07
＝0.31mm	0.075
		＝0.32mm	0.08
＝0.33mm	0.085
		＝0.34mm	0.09
＝0.35mm	0.095
		＝0.36mm	0.1
＝0.37mm	0.105
		＝0.38mm	0.11

＝0.39mm	0.115
		＝0.40mm	0.12
＝0.41mm	0.125
		＝0.42mm	0.13
＝0.43mm	0.135
		＝0.44mm	0.14
＝0.45mm	0.145
		＝0.46mm	0.15
＝0.47mm	0.155
		＝0.48mm	0.16
＝0.49mm	0.165
		＝0.50mm	0.17

Table 1

2) in the end a frame starts the flipper guide position probing after stinging steel; In the operation of rolling of band steel, in case generation sideslip, because the degree difference of sideslip, it is reflected in the difference of the position deviation amount of this frame entrance side guide plate, simultaneously because all there is the possibility of sideslip in the flipper guide of its corresponding roll active side and transmission side, so the position deviation amount X according to the frame entrance side guide plate that detects also must be different in the adjustment direction to roll gap, so we must regulate direction at the corresponding roll gap of testing result

When flipper guide during to the active side deviation departure be X1, $X1=\frac{\mathrm{\ΣPOSws}}{N}-\mathrm{POSset},$

When flipper guide during to the transmission side deviation departure be X2, $X2=\frac{\mathrm{\ΣPOSds}}{N}-\mathrm{POSset},$

∑ POSws active side position deviation total value;

∑ POSds transmission side position deviation total value;

The N times of collection;

POSset default deviation;

3) by flipper guide position deviation amount, 1 (position deviation/roll gap leveling scale lattice) of tabling look-up obtains roll gap leveling amount H, and has when flipper guide during to the active side deviation, and the active side roll gap presses down; Flipper guide is lifted on the active side roll gap when the transmission side deviation; Regulate roll gap according to roll gap leveling amount H.

Step 3, the correction of open side guide plate pressure detecting control roll gap after band steel toe portion arrives coil of strip, are closed the flipper guide position probing, and open side guide plate pressure detecting by detection side guide plate pressure divergence, is regulated roll gap leveling amount, to strip steel deviation; Specifically may further comprise the steps:

1) obtain the pressure differential P of flipper guide active side and transmission side and the roll gap leveling amount H of this pressure differential correspondence by experimental test, make pressure differential/roll gap leveling scale lattice, as shown in table 2;

Force value	The leveling amount
		＜＝10KG	0.02
＝12KG	0.024
		＝14KG	0.028
＝16KG	0.032
		＝18KG	0.036
＝20KG	0.04
		＝22KG	0.044
＝24KG	0.048
		＝26KG	0.052
＝28KG	0.056
		＝30KG	0.06
＝32KG	0.066
		＝34KG	0.072
＝36KG	0.078
		＝38KG	0.084
＝40KG	0.09
		＝42KG	0.096
＝44KG	0.102
		＝46KG	0.108
＝48KG	0.114

＝50KG	0.12
		＝52KG	0.128
＝54KG	0.136
		＝56KG	0.144
＝58KG	0.152
		＝60KG	0.16
＝62KG	0.168
		＝64KG	0.176
＝66KG	0.184
		＝68KG	0.192
＞＝70KG	0.2

Table 2

2) after band steel toe portion arrives coil of strip, close the flipper guide position probing, open side guide plate pressure detecting; In the operation of rolling of band steel, in case generation sideslip, because the degree difference of sideslip, it is reflected in the difference of the pressure divergence amount of this frame entrance side guide plate, simultaneously because all there is the possibility of sideslip in the flipper guide of its corresponding roll active side and transmission side, so also must be different in the adjustment direction to roll gap according to the pressure divergence amount P of the frame entrance side guide plate that detects, so we must regulate direction at the corresponding roll gap of testing result, the pressure differential P of detection side guide plate active side and transmission side, and distinguish

When active side pressure during greater than transmission side pressure pressure differential be P1, $P1=\frac{\mathrm{\ΣPws}}{N}-\mathrm{Pset},$

When active side pressure during less than transmission side pressure pressure differential be P2, $P2=\frac{\mathrm{\ΣPds}}{N}-\mathrm{Pset},$

∑ Pws active side position deviation total value;

∑ Pds transmission side position deviation total value;

The N times of collection;

Pset default deviation;

3) by flipper guide active side and transmission side pressure differential, 2 (pressure differentials/roll gap leveling scale lattice) of tabling look-up obtain roll gap leveling amount H, and when active side pressure was arranged greater than transmission side pressure, the active side roll gap pressed down; Active side pressure is lifted on the active side roll gap during less than transmission side pressure; Regulate roll gap according to roll gap leveling amount H.

Step 4, because at the band steel when leaving the tandem rolling frame, the afterbody of its band steel is in and loses the state of opening, and its probability that departs from rolling centerline is relatively large, in the control method of invention, adopted the scheme of opening flipper guide, to avoid greater impact power with steel afterbody offside guide plate; Close the flipper guide pressure detecting when the afterbody of band steel leaves first frame, the control of approaching side guide plate aperture is left the tandem rolling frame fully up to the band steel; According to the four-stage that flipper guide aperture in the step 1 is divided into, when leaving first frame, the afterbody of band steel controls

Flipper guide aperture=W+D3+D4.

Claims (5)

1. the control method of automatic deviation correction is characterized in that when a continuous hot-rolling mill was rolling, may further comprise the steps: step 1, band steel are gone into the flipper guide aperture control in steel stage, prepare to sting steel in first frame and arrive

The frame in back is stung the control that steel is finished stage offside guide plate aperture; Step 2, the correction of open side guide plate position detection control roll gap, in the end a frame opens after stinging steel

Moving flipper guide position probing by detection side guide plate position deviation, is regulated roll gap and is transferred

Flat amount is to strip steel deviation; Step 3, the correction of open side guide plate pressure detecting control roll gap, after band steel toe portion arrives coil of strip,

Close the flipper guide position probing, open side guide plate pressure detecting is led by detection side

The plate pressure divergence is regulated roll gap leveling amount, to strip steel deviation; Step 4, band steel are thrown the flipper guide aperture control in steel stage, when the afterbody of being with steel leaves first machine

Close the flipper guide pressure detecting during frame, the control of approaching side guide plate aperture is up to band

Steel leaves the tandem rolling frame fully.

2. the control method of automatic deviation correction is characterized in that when continuous hot-rolling mill as claimed in claim 1 was rolling, and the band steel is gone into the flipper guide aperture control in steel stage in the described step 1, may further comprise the steps:

1) flipper guide aperture segmentation is divided into four-stage to the flipper guide aperture, the flipper guide actuating quantity D1 of band steel when first frame is stung steel; The flipper guide actuating quantity D2 of band steel when second frame is stung steel; The flipper guide actuating quantity D3 of band steel when in the end a frame is stung steel; The band steel is finished the band back of wearing of tandem rolling frame and is with steel and the fixing space D 4 of flipper guide; Strip width is W;

Control flipper guide aperture=W+D1+D2+D3+D4 when 2) first frame is prepared to sting steel;

3) first frame is controlled flipper guide aperture=W+D2+D3+D4 after stinging steel;

4) second frame is controlled flipper guide aperture=W+D3+D4 after stinging steel;

5) last frame is controlled flipper guide aperture=W+D4 after stinging steel.

3. the control method of automatic deviation correction is characterized in that when continuous hot-rolling mill as claimed in claim 1 was rolling, and open side guide plate position detection control roll gap correction in the described step 2 may further comprise the steps:

1) obtains the roll gap leveling amount H of flipper guide position deviation amount X and this position deviation amount correspondence by experimental test, production location deviation/roll gap leveling scale lattice;

2) detection side guide plate position deviation amount X, and distinguish,

When flipper guide during to the active side deviation departure be X1, $X1=\frac{\mathrm{\ΣPOSws}}{N}-\mathrm{POSset},$

When flipper guide during to the transmission side deviation departure be X2, $X2=\frac{\mathrm{\ΣPOSds}}{N}-\mathrm{POSset},$

∑ POSws active side position deviation total value;

∑ POSds transmission side position deviation total value;

The N times of collection;

POSset default deviation;

3) by flipper guide position deviation amount, to look into position deviation/roll gap leveling scale lattice and obtain roll gap leveling amount H, and have when flipper guide during to the active side deviation, the active side roll gap presses down; Flipper guide is lifted on the active side roll gap when the transmission side deviation; Regulate roll gap according to roll gap leveling amount H.

4. the control method of automatic deviation correction is characterized in that when continuous hot-rolling mill as claimed in claim 1 was rolling, and open side guide plate pressure detecting control roll gap correction in the described step 3 may further comprise the steps:

1) obtains the pressure differential P of flipper guide active side and transmission side and the roll gap leveling amount H of this pressure differential correspondence by experimental test, make pressure differential/roll gap leveling scale lattice;

2) the pressure differential P of detection side guide plate active side and transmission side, and distinguish,

When active side pressure during greater than transmission side pressure pressure differential be P1, $P1=\frac{\mathrm{\ΣPws}}{N}-\mathrm{Pset},$

When active side pressure during less than transmission side pressure pressure differential be P2, $P2=\frac{\mathrm{\ΣPds}}{N}-\mathrm{Pset},$

∑ Pws active side position deviation total value;

∑ Pds transmission side position deviation total value;

The N times of collection;

Pset default deviation;

3), look into pressure differential/roll gap leveling scale lattice and obtain roll gap leveling amount H, and when active side pressure was arranged greater than transmission side pressure, the active side roll gap pressed down by flipper guide active side and transmission side pressure differential; Active side pressure is lifted on the active side roll gap during less than transmission side pressure; Regulate roll gap according to roll gap leveling amount H.

5. the control method of automatic deviation correction when continuous hot-rolling mill as claimed in claim 1 is rolling is characterized in that: the band steel is thrown the flipper guide aperture control in steel stage in the described step 4, may further comprise the steps:

1) the segmentation of flipper guide aperture, the flipper guide aperture is divided into four-stage, the flipper guide actuating quantity D1 of band steel when first frame is stung steel; The flipper guide actuating quantity D2 of band steel when second frame is stung steel; The flipper guide actuating quantity D3 of band steel when in the end a frame is stung steel; The band steel is finished the band back of wearing of tandem rolling frame and is with steel and the fixing space D 4 of flipper guide; Strip width is W;

2) when leaving first frame, the afterbody of band steel controls

Flipper guide aperture=W+D3+D4.

Images