CN110639960B - Full-automatic hot rolling steel drawing method - Google Patents

Full-automatic hot rolling steel drawing method Download PDF

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CN110639960B
CN110639960B CN201810678560.0A CN201810678560A CN110639960B CN 110639960 B CN110639960 B CN 110639960B CN 201810678560 A CN201810678560 A CN 201810678560A CN 110639960 B CN110639960 B CN 110639960B
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steel
finish rolling
time
rolling
acceleration
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CN110639960A (en
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谭耘宇
董刚
赖森贞
周心富
陈晨
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling

Abstract

The invention relates to a hot rolling full-automatic steel drawing method, and belongs to the technical field of strip steel rolling. The method comprises the steps of establishing a relation table corresponding to different strip steel specifications and finish rolling threading speed, finish rolling pure rolling time, finish rolling gap time and manual correction according to historical data, firstly searching whether data of strip steel with the same specification exist in the relation table, if so, directly controlling steel pumping rhythm by using historical data values in the relation table, otherwise, obtaining the finish rolling pure rolling time of the strip steel with the specification through calculation, controlling the steel pumping rhythm through preset finish rolling gap time and manual correction, and simultaneously storing the calculated steel pumping rhythm in the relation table. The invention can improve the precision of the control of the steel drawing rhythm and effectively prevent the influence on the rolling yield and the product quality due to the unstable rhythm.

Description

Full-automatic hot rolling steel drawing method
Technical Field
The invention relates to a hot rolling full-automatic steel drawing method, and belongs to the technical field of strip steel rolling.
Background
At present, in the large environment of intelligent manufacturing, domestic hot rolling systems strive to improve the respective automation level. In the aspect of hot rolling and steel drawing, a control method for fixing the steel drawing rhythm is mainly adopted at home and abroad. This method has the following problems: (1) the size of the slab varies in actual production, and the finish rolling time of the strip also varies. (2) In actual production, the tapping temperature of the plate blank is not fixed, and the finish rolling inlet temperature is changed, so that the finish rolling speed of the strip steel is changed, and the finish rolling time of the strip steel is changed. (3) In actual production, the process requirements of the same specification strip steel may also change, such as: and (4) finishing temperature. This also causes variations in the finish rolling speed, resulting in variations in the finish pure rolling time of the strip. Because the finish rolling time of the strip steel is changed, the rolling rhythm is also changed, and if the fixed rhythm control is adopted, the strip steel swings on a rolling line, so that the normal rolling of products and the product quality are influenced.
Through the search of the applicant, the Chinese invention patent with the patent number of CN201010209031.X discloses an equal-gap steel rolling control method, which is mainly characterized in that a heating furnace for next steel drawing is determined by adopting the minimum waiting time principle according to the actual interval time of two adjacent plate blanks reaching a rough rolling inlet rolling mill; the invention patent with the patent number CN201210565180.9 discloses a method for dynamically predicting the shortest in-furnace time of a plate blank in a hot rolling heating furnace model, which mainly calculates the residual in-furnace time; the invention discloses a steel drawing control method and device (CN201510869573.2) of a hot rolling production line, relates to a steel drawing control method and device of a hot rolling production line, and is used for acquiring the experience running time of each process flow on the hot rolling production line and preferably selecting the steel drawing time by monitoring a control signal of the hot rolling production line. However, the above methods cannot accurately control the steel drawing rhythm of the strip steel.
Disclosure of Invention
The invention aims to solve the technical problems that: the method for improving the precision of the steel drawing rhythm control and effectively preventing the influence on the rolling yield and the product quality due to the unstable rhythm is provided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a hot rolling full-automatic steel extraction method is characterized in that a slab comprises five stages including a strip threading speed stage, a first acceleration stage, a second acceleration stage, a highest speed stage and a deceleration stage from steel biting of a finish rolling inlet rack to steel throwing of a strip steel of an outlet rack; the method comprises the following steps:
step one, establishing a relation table of relations between different strip steel specifications and a finish rolling threading speed, an artificial correction amount, finish rolling pure rolling time and finish rolling gap time by utilizing historical data according to the length, the strength, the thickness and the width of a plate blank and the target thickness and the target width of strip steel; the specification of the strip steel comprises the length, the strength, the thickness and the width of a plate blank, and the target thickness and the target width of the strip steel;
step two, according to the length L1, the strength, the thickness H1, the width W1 of the plate blank, the target thickness H and the target width W of the strip steel, the finish rolling pure rolling time T and the finish rolling gap time T corresponding to the specification of the strip steel are searched from a relation tableGIf the finish pure rolling time T and the finish rolling which correspond to the strip steel specification are foundSystem gap time TGAnd the manual correction amount TOPThen executing step eight;
otherwise, executing the step three;
step three, calculating the length L of a finish rolling outlet of the strip steel, (L1H 1W 1)/(H W);
the finish rolling threading speed and the outlet thickness H of each rack are set according to the strip steeliDetermining the speed S of each stand of the strip steel finish rollingiWherein i is 1, 2,. 7; and calculating the length L of the strip steel from the biting of the finish rolling inlet frame F1 to the biting of the finish rolling outlet frame F70：
Figure BDA0001709869860000021
Wherein D0Is the distance between adjacent frames;
step four, calculating the time T from the steel biting of the rolling inlet frame F1 to the steel biting of the finish rolling outlet frame F70：
Figure BDA0001709869860000022
Step five, obtaining a first acceleration A of the strip steel of the specification according to the finish rolling speed schedule and the finish rolling threading speed1A second acceleration A2Deceleration A3Maximum speed SmAnd the steel throwing speed StAnd respectively calculating the lengths of the threading speed section, the first acceleration section, the second acceleration section, the highest speed section and the deceleration section:
wherein the length of the threading speed section is fixed to LtThe length of the first acceleration zone is the fixed distance from the finish rolling outlet stand to the coiler and is defined as L1；
Calculating the speed of the strip steel when the strip steel is coiled
Figure BDA0001709869860000023
Obtaining:
the second acceleration section has a length L2＝(Sm 2-Sc 2)/(2*A2)；
Length L of deceleration section3＝(Sm 2-St 2)/(2*A3)；
Length L of maximum speed segmentm＝L-(Lt+L1+L2+L3)；
Sixthly, according to the length L of the steel strip from the biting of the finish rolling inlet frame F1 to the biting of the finish rolling outlet frame F70Calculating the finish rolling pure rolling time T according to four conditions:
1) if (L)3-L0)>0 and Lm>0, after the strip is threaded in the finish rolling, firstly carrying out first acceleration to coiling and biting steel, then carrying out second acceleration to the highest speed, then decelerating to the steel throwing speed, and throwing steel at a finish rolling inlet rack of a deceleration section, wherein at the moment:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Time T of the second acceleration period2＝(Sm-Sc)/A2，
Time T of maximum speed section3＝Lm/SmAnd an
Time of deceleration section
Figure BDA0001709869860000024
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2+T3+T4；
2) Otherwise, if L- (L)0+Lt+L1+L2) If the speed is more than 0, after the strip is finished and threaded, firstly carrying out first acceleration to coiling and biting steel, then carrying out second acceleration to the highest speed or steel throwing speed, and throwing steel at a finish rolling inlet rack in the highest speed section or steel throwing speed section, wherein at the moment:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Time T of the second acceleration period2＝(Sm-Sc)/A2And an
Time T of maximum speed section3＝(Lm-L0)/Sm，
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2+T3；
3) Otherwise, if L- (L)0+Lt+L1) And if the speed is more than 0, after the strip is threaded in the finish rolling, firstly carrying out first acceleration to coiling and biting steel, then carrying out second acceleration to throwing steel speed, and throwing steel at a finish rolling inlet rack of a second acceleration section, wherein at the moment:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Recalculating second acceleration segment length L2 ═ L- (L)t+L1)，
Time of the second acceleration period
Figure BDA0001709869860000031
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2；
4) Otherwise, if L- (L)0+Lt) Greater than 0, then the finish rolling is worn to take the back, carries out first acceleration earlier to throwing steel speed, throws steel at first acceleration section finish rolling entry frame, this moment:
threading speed segment time Tt＝Lt/S7，
Recalculating the first acceleration segment length L1＝L-Lt，
First acceleration period
Figure BDA0001709869860000032
Therefore, the finish rolling pure rolling time T is Tt+T0+T1；
Seventhly, matching the specification of the strip steel with the corresponding finish rolling threading speed, finish rolling pure rolling time T and finish rolling gap time TGAnd the manual correction amount TOPStoring in a relational table in which a finish rolling gap time TGAnd the manual correction amount TOPIs a preset value;
step eight, calculating the steel drawing rhythm TGAP＝T+TG+TOPThen, the steel drawing action of the next piece of steel is determined according to the rhythm.
According to the invention, because the steel drawing rhythm of the strip steel is carried out according to the actual condition of the strip steel, different strip steel specifications, finish rolling threading speed, finish rolling pure rolling time T and finish rolling gap time T are established according to historical dataGAnd the manual correction amount TOPThe corresponding relation table is used for searching whether the data of the strip steel with the same specification exist or not from the relation table, if so, the historical data value in the relation table is directly used for controlling the steel drawing rhythm, otherwise, the finish rolling pure rolling time of the strip steel with the specification is obtained through calculation, and the preset finish rolling gap time T is passedGAnd the manual correction amount TOPAnd controlling the steel drawing rhythm, and storing the calculated steel drawing rhythm into a relation table. According to the invention, related equipment is not required to be added, and the steel drawing rhythm of the strip steel can be forecasted and controlled by accurately calculating the finish rolling pure rolling time in real time according to the data of the size, the speed and the like of the strip steel. Compared with a fixed rhythm, the invention greatly improves the precision of the control of the steel drawing rhythm and effectively prevents the influence on the rolling yield and the product quality due to the unstable rhythm.
The invention considers the intervention of operators in the calculation of the steel drawing rhythm, so that the steel drawing rhythm can more quickly approach the actual situation of the site. Of course, the manual correction T can be takenOPAnd (4) the process is 0, so that manual intervention is avoided, and the steel drawing rhythm can be automatically controlled.
In order to improve the precision of calculating the finish rolling pure rolling time, the technical scheme is further improved as follows: obtaining the steel biting time T of a finish rolling inlet frame according to the measurement of each strip steelF1ONAnd the steel throwing time T of the strip steel finish rolling outlet frameF1OFFAnd calculating the actual pure rolling time of the strip steel:
Ta＝TF1OFF-TF1ON；
actual pure rolling time TaAnd the deviation value delta T between the finish rolling pure rolling time T obtained by calculation in the step six is as follows:
ΔT＝T-Ta；
calculating the optimized value T of the finish rolling pure rolling time according to the deviation value delta TOFF：
TOFF＝ΔT*g，
Wherein g is a preset correction coefficient between 0 and 1.
In order to prevent the strip steel from swinging due to coiling and gear shifting, the technical scheme is further improved as follows: step eight, according to the current thickness H of the strip steelCThickness H of front piece strip steelPAnd shift thickness HDCCalculating whether a gear shift is required:
if ((H)P-HDC)*(HC-HDC) ) is greater than or equal to 0, no gear shift is required; otherwise, gear shifting is needed, and the steel clearance time T in the eight steps is adjusted at the momentGComprises the following steps:
TG＝TG+TDC；
wherein, TDCThe backlash compensation time for the crimp shift is a preset value.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic diagram of the complete process from steel biting of an inlet rack to steel throwing of an outlet rack in finish rolling.
FIG. 2 is a schematic diagram of a process from steel biting of a finish rolling inlet frame to steel throwing of an outlet frame in an embodiment of the invention.
FIG. 3 is a second schematic diagram of the process from the finish rolling inlet frame biting to the outlet frame throwing in the embodiment of the present invention.
FIG. 4 is a third schematic diagram of the process from steel biting of the finish rolling inlet frame to steel throwing of the outlet frame in the embodiment of the invention.
FIG. 5 is a fourth schematic diagram of the process from the steel biting of the finish rolling inlet frame to the steel throwing of the outlet frame in the embodiment of the invention.
Detailed Description
Examples
In the embodiment, the steel strip throwing from the steel biting of the finish rolling inlet frame to the steel strip throwing of the outlet frame comprises five stages as shown in figure 1, namely a strip threading speed stage, a first acceleration stage, a second acceleration stage, a highest speed stage and a deceleration stage.
The hot rolling full-automatic steel drawing method comprises the following steps:
step one, establishing a relation table of relations between different strip steel specifications and a finish rolling threading speed, an artificial correction amount, finish rolling pure rolling time and finish rolling gap time by utilizing historical data according to the length, the strength, the thickness and the width of a plate blank and the target thickness and the target width of strip steel; the specification of the strip steel comprises the length, the strength, the thickness and the width of a plate blank, and the target thickness and the target width of the strip steel;
step two, according to the length L1, the strength, the thickness H1, the width W1 of the plate blank, the target thickness H and the target width W of the strip steel, the finish rolling pure rolling time T and the finish rolling gap time T corresponding to the specification of the strip steel are searched from a relation tableGIf the finish rolling pure rolling time T and the finish rolling gap time T corresponding to the strip steel specification are foundGAnd the manual correction amount TOPThen executing step eight;
otherwise, executing the step three;
step three, calculating the length L of a finish rolling outlet of the strip steel, (L1H 1W 1)/(H W);
the finish rolling threading speed and the outlet thickness H of each rack are set according to the strip steeliDetermining the speed S of each stand of the strip steel finish rollingiWherein i is 1, 2,. 7; and calculating the length L of the strip steel from the biting of the finish rolling inlet frame F1 to the biting of the finish rolling outlet frame F70：
Figure BDA0001709869860000051
Wherein D0Is the distance between adjacent frames;
step four, calculating the time T from the steel biting of the rolling inlet frame F1 to the steel biting of the finish rolling outlet frame F70：
Figure BDA0001709869860000052
Step five, obtaining a first acceleration A of the strip steel of the specification according to the finish rolling speed schedule and the finish rolling threading speed1A second acceleration A2Deceleration A3Maximum speed SmAnd the steel throwing speed StAnd respectively calculating the lengths of the threading speed section, the first acceleration section, the second acceleration section, the highest speed section and the deceleration section:
wherein the length of the threading speed section is fixed to LtThe length of the first acceleration zone is the fixed distance from the finish rolling outlet stand to the coiler and is defined as L1；
Calculating the speed of the strip steel when the strip steel is coiled
Figure BDA0001709869860000053
Obtaining:
the second acceleration section has a length L2＝(Sm 2-Sc 2)/(2*A2)；
Length L of deceleration section3＝(Sm 2-St 2)/(2*A3)；
Length L of maximum speed segmentm＝L-(Lt+L1+L2+L3)；
Sixthly, according to the length L of the steel strip from the biting of the finish rolling inlet frame F1 to the biting of the finish rolling outlet frame F70Calculating the finish rolling pure rolling time T according to four conditions:
1) if (L)3-L0)>0 and Lm>0, after finishing rolling threading, firstly performing a first acceleration to coiling and biting steel, then performing a second acceleration to a maximum speed, then decelerating to a steel throwing speed, and throwing steel at a finishing rolling inlet rack of a deceleration section as shown in fig. 2, wherein:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Time T of the second acceleration period2＝(Sm-Sc)/A2，
Time T of maximum speed section3＝Lm/SmAnd an
Time of deceleration section
Figure BDA0001709869860000061
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2+T3+T4；
2) Otherwise, if L- (L)0+Lt+L1+L2) If the speed is more than 0, after the strip is finish rolled, as shown in fig. 3, firstly carrying out a first acceleration to coiling and biting steel, then carrying out a second acceleration to a highest speed or a steel throwing speed, and throwing steel at a finish rolling inlet rack in a highest speed section or a steel throwing speed section, wherein:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Time T of the second acceleration period2＝(Sm-Sc)/A2And an
Time T of maximum speed section3＝(Lm-L0)/Sm，
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2+T3；
3) Otherwise, if L- (L)0+Lt+L1) If the speed is more than 0, after the strip is finish rolled, as shown in fig. 4, the first acceleration to coiling steel biting is firstly carried out, then the second acceleration to steel throwing speed is carried out, and steel throwing is carried out on a finish rolling inlet rack in a second acceleration section, wherein:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Recalculating second acceleration segment length L2 ═ L- (L)t+L1)，
Time of the second acceleration period
Figure BDA0001709869860000062
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2；
4) Otherwise, if L- (L)0+Lt) If the acceleration is more than 0, after the strip is finish rolled, as shown in fig. 5, the first acceleration is carried out to the steel throwing speed, and steel is thrown at the finish rolling inlet rack in the first acceleration section, at the moment:
threading speed segment time Tt＝Lt/S7，
Recalculating the first acceleration segment length L1＝L-Lt，
First acceleration period
Figure BDA0001709869860000071
Therefore, the finish rolling pure rolling time T is Tt+T0+T1；
Seventhly, matching the specification of the strip steel with the corresponding finish rolling threading speed, finish rolling pure rolling time T and finish rolling gap time TGAnd the manual correction amount TOPStoring in a relational table in which a finish rolling gap time TGAnd the manual correction amount TOPIs a preset value;
step eight, calculating the steel drawing rhythm TGAP＝T+TG+TOPThen, the steel drawing action of the next piece of steel is determined according to the rhythm.
The embodiment can be further modified as follows: (1) in order to improve the precision of calculating the finish rolling pure rolling time, the steel biting time T of a finish rolling inlet frame is measured according to each strip steelF1ONAnd the steel throwing time T of the strip steel finish rolling outlet frameF1OFFCalculating the bandActual pure rolling time of steel:
Ta＝TF1OFF-TF1ON；
actual pure rolling time TaAnd the deviation value delta T between the finish rolling pure rolling time T obtained by calculation in the step six is as follows:
ΔT＝T-Ta；
calculating the optimized value T of the finish rolling pure rolling time according to the deviation value delta TOFF：
TOFF＝ΔT*g，
Wherein g is a preset correction coefficient between 0 and 1.
(2) In order to prevent the strip steel from swinging due to coiling gear shifting, in step eight, according to the current thickness H of the strip steelCThickness H of front piece strip steelPAnd shift thickness HDCCalculating whether a gear shift is required:
if ((H)P-HDC)*(HC-HDC) ) is greater than or equal to 0, no gear shift is required; otherwise, gear shifting is needed, and the steel clearance time T in the eight steps is adjusted at the momentGComprises the following steps:
TG＝TG+TDC；
wherein, TDCThe backlash compensation time for the crimp shift is a preset value.
(3) And dynamically adjusting the finish rolling pure rolling time of the plate blank in the furnace according to the condition of the rolled strip steel.
And recording the finish rolling threading speed threeadspd 2 used by the current strip steel during steel loading. And reading the finish rolling threading speed threeadspd used by the steel strip specification stored in the relation table. Comparing the threadppd with the threadppd 2, if not, recalculating the finish pure rolling time of the strip steel, and updating the finish pure rolling time and the finish threading speed in the relation table.
The present invention is not limited to the above embodiments, and the technical solutions of the above embodiments of the present invention may be combined with each other in a crossing manner to form a new technical solution, and all technical solutions formed by adopting equivalent substitutions fall within the protection scope of the present invention.

Claims (3)

1. A hot rolling full-automatic steel extraction method is characterized in that a slab comprises five stages including a strip threading speed stage, a first acceleration stage, a second acceleration stage, a highest speed stage and a deceleration stage from steel biting of a finish rolling inlet rack to steel throwing of a strip steel of an outlet rack; characterized in that the method comprises the following steps:
step one, establishing a relation table of relations between different strip steel specifications and a finish rolling threading speed, an artificial correction amount, finish rolling pure rolling time and finish rolling gap time by utilizing historical data according to the length, the strength, the thickness and the width of a plate blank and the target thickness and the target width of strip steel;
step two, according to the length L1, the strength, the thickness H1, the width W1 of the plate blank, the target thickness H and the target width W of the strip steel, the finish rolling pure rolling time T and the finish rolling gap time T corresponding to the specification of the strip steel are searched from a relation tableGIf the finish rolling pure rolling time T and the finish rolling gap time T corresponding to the strip steel specification are foundGAnd the manual correction amount TOPThen executing step eight;
otherwise, executing the step three;
step three, calculating the length L of a finish rolling outlet of the strip steel, (L1H 1W 1)/(H W);
the finish rolling threading speed and the outlet thickness H of each rack are set according to the strip steeliDetermining the speed S of each stand of the strip steel finish rollingiWherein i is 1, 2,. 7; and calculating the length L of the strip steel from the biting of the finish rolling inlet frame F1 to the biting of the finish rolling outlet frame F70：
Figure FDA0002668748010000011
Wherein D0Is the distance between adjacent frames;
step four, calculating the time T from the steel biting of the finish rolling inlet frame F1 to the steel biting of the finish rolling outlet frame F70：
Figure FDA0002668748010000012
Step five, obtaining a first acceleration A of the strip steel with the current specification according to the finish rolling speed schedule and the finish rolling threading speed1A second acceleration A2Deceleration A3Maximum speed SmAnd the steel throwing speed StAnd calculating the lengths of the five stages:
wherein the length of the threading speed section is fixed to LtThe length of the first acceleration zone is the fixed distance from the finish rolling outlet stand to the coiler and is defined as L1；
Calculating the speed of the strip steel when the strip steel is coiled
Figure FDA0002668748010000013
Obtaining:
the second acceleration section has a length L2＝(Sm 2-Sc 2)/(2*A2)；
Length L of deceleration section3＝(Sm 2-St 2)/(2*A3)；
Length L of maximum speed segmentm＝L-(Lt+L1+L2+L3)；
Sixthly, according to the length L of the steel strip from the biting of the finish rolling inlet frame F1 to the biting of the finish rolling outlet frame F70Calculating the finish rolling pure rolling time T according to four conditions:
1) if (L)3-L0)>0 and Lm>0, after the strip is threaded in the finish rolling, firstly carrying out first acceleration to coiling and biting steel, then carrying out second acceleration to the highest speed, then decelerating to the steel throwing speed, and throwing steel at a finish rolling inlet rack of a deceleration section, wherein at the moment:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Time T of the second acceleration period2＝(Sm-Sc)/A2，
Time T of maximum speed section3＝Lm/SmTo do so byAnd
time of deceleration section
Figure FDA0002668748010000021
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2+T3+T4；
2) Otherwise, if L- (L)0+Lt+L1+L2) If the speed is more than 0, after the strip is finished and threaded, firstly carrying out first acceleration to coiling and biting steel, then carrying out second acceleration to the highest speed or steel throwing speed, and throwing steel at a finish rolling inlet rack in the highest speed section or steel throwing speed section, wherein at the moment:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Time T of the second acceleration period2＝(Sm-Sc)/A2And an
Time T of maximum speed section3＝(Lm-L0)/Sm，
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2+T3；
3) Otherwise, if L- (L)0+Lt+L1) And if the speed is more than 0, after the strip is threaded in the finish rolling, firstly carrying out first acceleration to coiling and biting steel, then carrying out second acceleration to throwing steel speed, and throwing steel at a finish rolling inlet rack of a second acceleration section, wherein at the moment:
threading speed segment time Tt＝Lt/S7，
First acceleration period T1＝(Sc-S7)/A1，
Recalculating second acceleration segment length L2 ═ L- (L)t+L1)，
Time of the second acceleration period
Figure FDA0002668748010000022
Therefore, the finish rolling pure rolling time T is Tt+T0+T1+T2；
4) Otherwise, if L- (L)0+Lt) Greater than 0, then the finish rolling is worn to take the back, carries out first acceleration earlier to throwing steel speed, throws steel at first acceleration section finish rolling entry frame, this moment:
threading speed segment time Tt＝Lt/S7，
Recalculating the first acceleration segment length L1＝L-Lt，
First acceleration period
Figure FDA0002668748010000023
Therefore, the finish rolling pure rolling time T is Tt+T0+T1；
Seventhly, matching the specification of the strip steel with the corresponding finish rolling threading speed, finish rolling pure rolling time T and finish rolling gap time TGAnd the manual correction amount TOPStored in a relational table in which the finish rolling gap time TGAnd the manual correction amount TOPIs a preset value;
step eight, calculating the steel drawing rhythm TGAP＝T+TG+TOPThen, the steel drawing action of the next piece of steel is determined according to the rhythm.
2. The hot-rolled full-automatic steel drawing method according to claim 1, characterized in that: obtaining the steel biting time T of a finish rolling inlet frame according to the measurement of each strip steelF1ONAnd the steel throwing time T of the strip steel finish rolling outlet frameF1OFFAnd calculating the actual pure rolling time of the strip steel:
Ta＝TF1OFF-TF1ON；
actual pure rolling time TaAnd the deviation value delta T between the finish rolling pure rolling time T obtained by the calculation in the step six is as follows:
△T＝T-Ta；
calculating the optimized value T of finish rolling pure rolling time according to the deviation value delta TOFF：
TOFF＝△T*g，
Wherein g is a preset correction coefficient between 0 and 1;
in the sixth step, the value T is optimized according to the finish rolling pure rolling timeOFFTo optimize the finish rolling pure rolling time T, i.e. in the eighth step, the steel drawing rhythm TGAP＝T+TG+TOFF。
3. The hot-rolled full-automatic steel drawing method according to claim 1, characterized in that: step eight, according to the current thickness H of the strip steelCThickness H of front piece strip steelPAnd shift thickness HDCCalculating whether a gear shift is required:
if ((H)P-HDC)*(HC-HDC) ) is greater than or equal to 0, no gear shift is required; otherwise, gear shifting is needed, and the steel clearance time T in the eight steps is adjusted at the momentGComprises the following steps:
TG＝TG+TDC；
wherein, TDCThe backlash compensation time for the crimp shift is a preset value.
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