CN106345819A - Controlling method of hot continuous rolled and finish rolled strip steel tail rolling stability - Google Patents

Abstract

The invention relates to a controlling method of hot continuous rolled and finish rolled strip steel tail rolling stability. The method is characterized by using an actual rolling position in the strip steel frame which is measured by strip steel width measuring equipment installed on a rear rolling frame and the exit of a finish rolling mill together with change of rolling force which is measured during the rolling process and adopting a certain model and algorithm, deviation and change of frame rolling force are arisen from change of the position of the tail part of the strip steel, wherein the method is to dynamically conduct adjustment and control of rolling mill cleaning of the finish rolling mill F4-F7 process, the dynamic control of the adjustment comprises Si-1 and Si-2, Si-1 is an asymmetric regulating variable of a i frame (unit: mm), Si-2 is a regulating variable of real-time strip steel center position change of the i frame (unit: mm), which enables the strip steel to always roll along the center line of the finish rolling frame, thus resolving off tracking and drift during rolling process of the tail part of the strip steel and improving stability of rolling on the tail part of the hot continuous rolled and finish rolled strip steel.

Description

A kind of control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability

Technical field

The invention belongs to hot-strip production technical field is it is adaptable to the afterbody stable rolling of hot-strip product.

Background technology

Hot-strip afterbody is a complicated technique change process, comprising: tail temperature change, afterbody tension force Change, afterbody thickness change, aft plate deformation, loading roll gap change etc..And light just affects loading roll gap Factor mainly has the original convexity of rolling load, bending roller force, roll, thermal expansion of rollers and roll wear etc..Separately, Due to very short by the time, the time leaving control for is very limited for tail part of band steel, such as Thin Specs 2.01mm thickness Tail part of band steel is less than 0.4s by the time of f6～f7 frame.

Tail part of band steel rolling stability problem is the big difficult point during current hot continuous rolling produces, nearly all hot continuous rolling Production line all can run into this problem, seek effective technique and control device controls afterbody to throw steel always hot rolling neck The direction that domain is made great efforts.

The jockey pulley leveling technology of this art main You Xi mark company exploitation at present and foundation are arranged on kink Differential pressure kink technology of leveling etc. is carried out after strip tension being detected on device.However, these technology broadly fall into Survey control technology indirectly, needs larger investment.And due to numerous reasons, control effect is expected with user There is larger gap.For this reason, it may be necessary to the roll-force of frame is passively changed during whipping, strip steel is in finish rolling simultaneously The centre deviation of rack outlet is also with changing.Using the band being arranged on finish rolling afer bay and finishing mill outlet Measure, in actual rolling position and the operation of rolling, the roll-force obtaining in the strip steel frame that steel width measure equipment records Change, develops certain model and algorithm, dynamically mill roll-gap is adjusted controlling, makes strip steel all the time in essence Mill stand centrage rolls, thus solving sideslip whipping in the tail part of band steel operation of rolling, improves hot continuous rolling finish rolling band The stability of steel afterbody rolling.

Content of the invention

It is contemplated that the control technology of hot continuous rolling fine-rolling strip steel afterbody rolling stability, so that it is guaranteed that hot continuous rolling life Produce stable.

Technical solution of the present invention principle is as follows；

The present invention relates to the use of and be arranged on what the strip width measuring apparatus of finish rolling afer bay and finishing mill outlet recorded Measure, in actual rolling position and the operation of rolling, the roll-force change obtaining in strip steel frame, develop certain model And algorithm, dynamically mill roll-gap is adjusted controlling, so that strip steel is rolled in finishing stand centrage all the time, from And solve sideslip whipping in the tail part of band steel operation of rolling, improve the stability of hot continuous rolling fine-rolling strip steel afterbody rolling.

Specifically comprise the following steps that

1st, comprehensive solution

The present invention is gone out with finishing mill with roll-force variation relation trend characteristic and strip running deviation according to for strip running deviation Mouth strip steel center variation tendency relation feature, design automatically controls finishing mill strip steel whipping problem and controls integration scenario.

A kind of technical scheme of the control method of present invention hot continuous rolling fine-rolling strip steel afterbody rolling stability is as follows:

A kind of control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability is it is characterised in that methods described root Frame rolling force deviation is caused to change according to tail part of band steel change in location, thus the mill rolls to finishing mill f4-f7 operation Stitch the dynamic control being adjusted, the dynamic control of described regulation includesWithWithControl System adjusts and carries out simultaneously,

The asymmetric regulated quantity of the i-th frame, unit: mm,

The regulated quantity of the i-th frame real-time strip steel center change, unit: mm,

Algorithm is as follows:

${\mathrm{\δs}}_{i^{-1}}=k_f*k_w*k_h*\left(\frac{{\mathrm{\δp}}_i-{\mathrm{\δp}}_l}{m_i}\right)----\left(1\right)$

In above formula:

Kf: frame action effect coefficient, scope: 0.3～1.0,

The other coefficient of kw: width layer, scope: 0.5～1.9,

The other coefficient of kh: thick layer, foundation strip steel finished product thickness, scope: 0.5～1.9,

δ pi: the i-th frame real-time roll-force variable quantity, unit: n,

δ pl: locking roll-force variable quantity, unit: n,

The mill stiffness of the mi: the i-th frame, unit: t/mm,

Algorithm is as follows:

${\mathrm{\δs}}_{i^{-2}}=k_p\left({\mathrm{\δw}}_i\right)+{\mathrm{\σk}}_i\left({\mathrm{\δw}}_i\right)----\left(2\right)$

In above formula:

Kp: frame proportional control factor, scope: (2-6) * 10^-8,

Ki: the i-th frame frame integral adjustment coefficient, scope: (1-3) * 10^-9,

δ wi: the i-th frame real-time strip steel center variable quantity, scope: +/- 100mm,

Obtained according to describedWithDynamically mill roll-gap is adjusted controlling, so that strip steel is existed all the time Finishing stand centrage rolls, thus solving sideslip whipping in the tail part of band steel operation of rolling, improves hot continuous rolling finish rolling The stability of tail part of band steel rolling.

Control method according to hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention it is characterised in that

?In the asymmetric regulated quantity computing formula of the i-th frame,

δ pi: scope is 0.5～2*10⁶N,

δ pl: scope is 0.5～2*10⁶N,

Mi: scope is 590-610.

Control method according to hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention it is characterised in that

?In the asymmetric regulated quantity computing formula of the i-th frame,

δ pi: scope is 1*10⁶N,

δ pl: scope is 1*10⁶N,

Mi: scope is 600.

Control method according to hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention it is characterised in that

?In the regulated quantity computing formula of strip steel center change in real time,

Kp: scope: (2-6) * 10^-8,

Ki: scope: (1-3) * 10^-9,

δ wi: scope: +/- 100mm.

Control method according to hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention it is characterised in that

?In the regulated quantity computing formula of strip steel center change in real time,

Kp: scope: 4*10^-8,

Ki: scope: 2*10^-9.

Control method according to hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention it is characterised in that

The regulated quantity scope of δ si-2: the i-th frame real-time strip steel center change；+/-1mm.

According to the control method of described hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention, its feature It is,

The regulated quantity scope of δ si-1: the i-th frame real-time strip steel center change；+/-1mm.

Control method according to hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention it is characterised in that

WithControl and regulation carry out in every procedure of finishing mill f4-f7.

By rightWithAdjust, that is, the control and regulation amount adjusting inhibiting band steel sideslip whipping and must exporting, Can control the sideslip whipping in the tail part of band steel operation of rolling of application claims.

The present invention relates to the use of and be arranged on what the strip width measuring apparatus of finish rolling afer bay and finishing mill outlet recorded Measure, in actual rolling position and the operation of rolling, the roll-force change obtaining in strip steel frame, develop certain model And algorithm, dynamically mill roll-gap is adjusted controlling, so that strip steel is rolled in finishing stand centrage all the time, from And solve sideslip whipping in the tail part of band steel operation of rolling, improve the stability of hot continuous rolling fine-rolling strip steel afterbody rolling.

Brief description

Fig. 1 is the comprehensive solution of the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention Block diagram.

Fig. 2 is f4/f5 frame band in the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention Steel sideslip roll-force change schematic diagram.

Fig. 3 is f6/f7 frame band in the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention Steel sideslip roll-force change moment and feature schematic diagram.

Fig. 4 is strip steel in finishing mill in the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability of the present invention Center change schematic diagram.

Specific embodiment

Embodiment

A kind of control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability, methods described is according to tail part of band steel position Putting change causes frame rolling force deviation to change, thus the mill roll-gap of finishing mill f4-f7 operation is adjusted Dynamic control, the dynamic control of described leveling includesWithWithControl and regulation enter simultaneously OK,

The asymmetric regulated quantity of the i-th frame, unit: mm,

The regulated quantity of strip steel center change in real time, unit: mm,

Algorithm is as follows:

${\mathrm{\δs}}_{i^{-1}}=k_f*k_w*k_h*\left(\frac{{\mathrm{\δp}}_i-{\mathrm{\δp}}_l}{m_i}\right)----\left(1\right)$

In above formula:

Kf: frame action effect coefficient (obtained by experiment, scope: 0.3～1.0),

The other coefficient of kw: width layer (scope: 0.5～1.9),

The other coefficient of kh: thick layer (foundation strip steel finished product thickness, scope: 0.5～1.9),

δ pi: roll-force variable quantity (unit: n) in real time,

δ pl: locking roll-force variable quantity (unit: n),

The mill stiffness (unit: t/mm) of the mi: the i-th frame,

Algorithm is as follows:

${\mathrm{\δs}}_{i^{-2}}=k_p\left({\mathrm{\δw}}_i\right)+{\mathrm{\σk}}_i\left({\mathrm{\δw}}_i\right)----\left(2\right)$

In above formula:

Kp: frame proportional control factor, scope: (2-6) * 10^-8,

Ki: frame integral adjustment coefficient, scope: (1-3) * 10^-9,

δ wi: strip steel center variable quantity in real time, scope: +/- 100mm,

Obtained according to describedWithDynamically mill roll-gap is adjusted controlling, makes strip steel all the time in essence Mill stand centrage rolls, thus solving sideslip whipping in the tail part of band steel operation of rolling, improves hot continuous rolling finish rolling band The stability of steel afterbody rolling.

When strip steel " moves about " in finishing stand, the roll-force of milling train both sides is incited somebody to action because rolled piece deviates roll centre Change.But by analysing in depth to actual production strip steel, it is right that the change of this roll-force will be able to be detected Frame has certain scope.The typical strip steel of analysis: 1253899512002.61mm*1256mm iw9421e5. Itv playback display: strip steel f3 starts inclined working side after throwing steel；Strip steel f4 throws after steel substantially partially working side；Strip steel f5 After throwing steel, seriously working side partially is rolled brokenly；Strip steel f6 continues inclined working side after throwing steel and rolls brokenly；Strip steel f7 entrance works partially Side degree mitigates, and is not formed in f7 entrance and rolls brokenly again.As follows to pda data analysiss:

Table one: rolling force deviation and persistent period

Tail part of band steel position	F3～f4	F4～f5	F5～f6	F6～f7
					Rolling force deviation	14t	13t	117t	58t
Persistent period	0.15s	0.18s	0.27s	0.47s

From upper table analysis, to f4, f5 frame, strip running deviation is embodied in inconspicuous in roll-force, thus shadow Ring the strip running deviation levelling function effect based on rolling force deviation.

To polylith strip steel statistical analysiss, f4, f5 frame is had in roll-force only less than 50% sideslip whipping strip steel 15t about embodiment, have 50% sideslip whipping strip steel roll-force no embody or little roll-force bear embody.For F6/f7 frame, strip running deviation has obvious embodiment in roll-force, is controlled based on the sideslip leveling of roll-force change Preferable control effect can be played on f6/f7 frame.

Table two: strip running deviation causes the roll-force significant change time

From upper table analysis, to f6, f7 frame, strip running deviation is embodied in roll-force obvious hysteresis, The i.e. starting stage of strip running deviation, roll-force no substantially embodies；And once in roll-force change body Existing, then roll-force feature jumpy occurs.To polylith strip steel statistical analysiss, only 50% about time base Can play a role in roll-force change leveling, and regulator parameter designing drastically need to change in conjunction with roll-force back segment Feature.

Hot-rolling line finds in actual production process, and rolling position in finishing stand for the strip steel can " be passed sometimes Pass " to finishing stand outlet, and the amount that finishing stand exports strip steel deviation theory rolling centerline can be by being arranged on The width gage measurement of finishing mill outlet obtains, and each frame is larger to the performance situation difference of " transmission ".Analysis allusion quotation Type strip steel: di1061g11081*2.01.Strip steel center variation tendency is consistent in f3/f4 frame, but F5 throws strip steel center variation tendency before steel to f6 before throwing steel and turns to, and throws from f6 and throws steel band steel center to f7 before steel Change in location trend returns again to.Thus it can be deduced that strip steel has distortion between f4～f5 and between f6～f7 Scene.To polylith strip steel statistical analysiss, 1580 producing lines above-mentioned scene generally existing.For forebay (f4/f5), After f7, finishing mill strip steel center variation tendency can not correctly reflect actual bit in these frames for the strip steel Put variation tendency.

The present invention relates to the use of and be arranged on what the strip width measuring apparatus of finish rolling afer bay and finishing mill outlet recorded Measure, in actual rolling position and the operation of rolling, the roll-force change obtaining in strip steel frame, develop certain model And algorithm, dynamically mill roll-gap is adjusted controlling, so that strip steel is rolled in finishing stand centrage all the time, from And solve sideslip whipping in the tail part of band steel operation of rolling, improve the stability of hot continuous rolling fine-rolling strip steel afterbody rolling.

Present invention development and implementation in certain hot continuous rolling 1580 producing line achieves positive effect so that this producing line technology is real Apply before and after's afterbody and roll brokenly rate decline 50%.Demonstrate the effectiveness of the comprehensive solution of proposition, for further from now on Lift and solve the problems, such as that whipping provides practical basis.Because tail part of band steel rolling stability problem is current hot continuous rolling life In product one big difficult point, nearly all hot continuous rolling production line all can run into this problem, popularization and application therefore of the present invention Have a extensive future.

Claims (8)

1. a kind of control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability is it is characterised in that methods described Frame rolling force deviation is caused to change according to tail part of band steel change in location, thus the milling train to finishing mill f4-f7 operation The dynamic control that roll gap is adjusted, the dynamic control of described regulation includesWithWith's Control and regulation are carried out simultaneously,

The asymmetric regulated quantity of the i-th frame, unit: mm,

The regulated quantity of the i-th frame real-time strip steel center change, unit: mm,

Algorithm is as follows:

$\▿s_{i^{-1}}=k_f*k_w*k_h*\left(\frac{{\mathrm{\δp}}_i-{\mathrm{\δp}}_l}{m_i}\right)----\left(1\right)$

In above formula:

Kf: frame action effect coefficient, scope: 0.3～1.0,

The other coefficient of kw: width layer, scope: 0.5～1.9,

The other coefficient of kh: thick layer, foundation strip steel finished product thickness, scope: 0.5～1.9,

δ pi: the i-th frame real-time roll-force variable quantity, unit: n,

δ pl: locking roll-force variable quantity, unit: n,

The mill stiffness of the mi: the i-th frame, unit: t/mm,

Algorithm is as follows:

${\mathrm{\δs}}_{i^{-2}}=k_p\left({\mathrm{\δw}}_i\right)+{\mathrm{\σk}}_i\left({\mathrm{\δw}}_i\right)----\left(2\right)$

In above formula:

Kp: frame proportional control factor, scope: (2-6) * 10^-8,

Ki: the i-th frame frame integral adjustment coefficient, scope: (1-3) * 10^-9,

δ wi: the i-th frame real-time strip steel center variable quantity, scope: +/- 100mm,

Obtained according to describedWithDynamically mill roll-gap is adjusted controlling, makes strip steel all the time in essence Mill stand centrage rolls, thus solving sideslip whipping in the tail part of band steel operation of rolling, improves hot continuous rolling finish rolling band The stability of steel afterbody rolling.

2. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 1, its feature It is,

?In the asymmetric regulated quantity computing formula of the i-th frame,

δ pi: scope is 0.5～2*10⁶N,

δ pl: scope is 0.5～2*10⁶N,

Mi: scope is 590-610.

3. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 2, its feature It is,

?In the asymmetric regulated quantity computing formula of the i-th frame,

δ pi: scope is 1*10⁶N,

δ pl: scope is 1*10⁶N,

Mi: scope is 600.

4. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 1, its feature It is,

?In the regulated quantity computing formula of strip steel center change in real time,

Kp: scope: (2-6) * 10^-8,

Ki: scope: (1-3) * 10^-9,

δ wi: scope: +/- 100mm.

5. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 4, its feature It is,

?In the regulated quantity computing formula of strip steel center change in real time,

Kp: scope: 4*10^-8,

Ki: scope: 2*10^-9.

6. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 1, its feature It is,

The regulated quantity scope of δ si-2: the i-th frame real-time strip steel center change；+/-1mm.

7. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 1, its feature It is,

The regulated quantity scope of δ si-1: the i-th frame real-time strip steel center change；+/-1mm.

8. the control method of hot continuous rolling fine-rolling strip steel afterbody rolling stability as claimed in claim 1, its feature It is,

WithControl and regulation carry out in every procedure of finishing mill f4-f7.