阅读说明：本技术 一种无取向硅钢冷连轧设备及厚度控制方法 (Non-oriented silicon steel cold continuous rolling equipment and thickness control method ) 是由 胥建平 王振基 钟海清 游光明 王�华 金大华 付志刚 卢焱飞 欧阳锦 朱映玉 于 2020-06-17 设计创作，主要内容包括：一种无取向硅钢冷连轧设备及厚度控制方法,属于无取向硅钢冷轧成型技术领域,其中的无取向硅钢冷连轧设备,包括五机架六辊冷连轧机和双卷筒卷取机,所述五机架六辊冷连轧机的每组冷轧机组上的中间辊的端部均设置有倒角,五机架六辊冷连轧机的第一、二和三冷轧机组上的工作辊的端部均设置有倒角,且第一冷轧机组和第二冷轧机组的工作辊的倒角高度均大于第三冷轧机组的工作辊的倒角高度,本发明的有益效果是,本发明通过对冷连轧设备的结构和冷连轧的工艺进行改进优化,保证了带钢纵向厚度的测量精度,提高了无取向硅钢带横向厚度的控制力,减小了钢带头尾厚度超差的长度,减轻了无取向硅钢带的边部减薄,提高了钢带纵向厚度合格率和横向厚度的合格率。(The invention discloses non-oriented silicon steel cold continuous rolling equipment and a thickness control method, belonging to the technical field of non-oriented silicon steel cold rolling forming, wherein the non-oriented silicon steel cold continuous rolling equipment comprises a five-rack six-roller cold continuous rolling mill and a double-reel coiler, the end parts of middle rollers on each group of cold rolling mill group of the five-rack six-roller cold continuous rolling mill are respectively provided with a chamfer, the end parts of working rollers on first, second and third cold rolling mill groups of the five-rack six-roller cold continuous rolling mill are respectively provided with a chamfer, and the chamfer heights of the working rollers of the first cold rolling mill group and the second cold rolling mill group are respectively greater than the chamfer height of the working roller of the third cold rolling mill group. The reduction of the edge of the non-oriented silicon steel strip is reduced, and the qualification rate of the longitudinal thickness and the qualification rate of the transverse thickness of the steel strip are improved.)

1. The utility model provides a cold tandem rolling equipment of non-oriented silicon steel, its characterized in that, includes five frames six rolls cold tandem rolling mill (1) and two reel coiling machines (2), five frames six rolls cold tandem rolling mill (1) include along the rolling direction of belted steel set gradually first, two, three, four, five cold rolling mill groups, every cold rolling mill group is including relative setting and by work roll (11), middle roll (12) and backing roll (13) that the center outwards set gradually, the tip of middle roll (12) on every cold rolling mill group all is provided with the chamfer, the tip of work roll (11) on first, two and the three cold rolling mill groups of five frames six rolls cold tandem rolling mill (1) all is provided with the chamfer, and the chamfer height of work roll (11) of first cold rolling mill group and second cold rolling mill group all is greater than the chamfer height of work roll (11) of third cold rolling mill group.

2. The cold continuous rolling equipment for nonoriented silicon steel according to claim 1, characterized in that the length of the chamfer of the end of the intermediate roll (12) is 50mm to 100mm, and the height of the chamfer of the intermediate roll (12) is 0.3mm to 0.8 mm.

3. The cold continuous rolling equipment for nonoriented silicon steel according to the claim 1, characterized in that the chamfer length of the end of the working roll (11) of the first cold rolling unit and the second cold rolling unit is 275 mm-390 mm, and the chamfer height is 0.4-0.7 mm; the chamfer length of the end part of the working roll (11) of the second cold rolling unit is 275-390 mm, and the chamfer height is 0.2-0.4 mm.

4. The cold continuous rolling equipment for non-oriented silicon steel according to any one of claims 1 to 3, wherein a thickness gauge I (3) and a thickness gauge II (4) are sequentially arranged behind a fifth cold rolling unit of the five-stand six-roll cold continuous rolling mill (1) along the rolling direction of the strip steel, the thickness gauge I (3) and the thickness gauge II (4) transmit the detected thickness data of the strip steel to the PLC control unit (5), the PLC control unit (5) calculates the thickness difference of the two thickness gauges, when the thickness difference is larger than 5 μm, the PLC control unit (5) controls the alarm unit (6) to work, and when the thickness difference is smaller than or equal to 5 μm, the alarm unit (6) does not work.

5. The cold continuous rolling equipment for non-oriented silicon steel according to claim 4, wherein one end of each of two coiling mandrels of the double-reel coiler (2) is connected with a servo motor (21), an encoder (22) is arranged on each servo motor (21), and each encoder (22) is electrically connected with a driving motor (7) for driving the working roll (11) to rotate through a PLC (programmable logic controller) unit (5).

6. A method for controlling the thickness of cold continuous rolling of non-oriented silicon steel by using the cold continuous rolling equipment for non-oriented silicon steel as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:

1) the non-oriented silicon steel strip is uncoiled by an uncoiler, straightened, welded and pickled, enters a five-rack six-roller cold continuous rolling mill for rolling, and is wound on a double-reel coiler (2) by a guide roller;

2) after an encoder (22) on a servo motor (21) detects that the strip head of the uncoiled non-oriented silicon steel strip is coiled for 5-10 circles on a coiling drum of a double-coiling drum coiler (2), a PLC control unit (5) controls the rotating speed of a driving motor (7) to enable a working roll (11) of a five-rack six-roll cold continuous rolling mill (1) to automatically increase the speed to a certain stable speed of 200-400 m/min for rolling, and after the steel strip is stably coiled, the working roll (11) of the five-rack six-roll cold continuous rolling mill (1) is manually controlled to increase the speed to the range of 400-1000 m/min for accelerated rolling; in the rolling process, controlling the axial movement amount of the intermediate roll (12) of the five-stand six-roll cold continuous rolling mill (1) to be 0, controlling the roll bending force of the intermediate roll (12) of the first four rolling mills of the five-stand six-roll cold continuous rolling mill (1) to be 600-720 KN, and controlling the roll bending force of the working roll (11) to be 400-500 KN;

3) after the strip steel passes through an outlet of a fifth rolling mill of the five-rack six-roller cold continuous rolling mill (1), a strip shape meter (8) monitors strip shape data of the strip steel in real time and compares the strip shape data with a set target curve of a middle wave mode to obtain a first order coefficient and a second order coefficient of a quadratic curve of strip shape deviation so as to control the inclination control quantity of a supporting roller (13), the bending control quantity of a middle roller (12) and the bending control quantity of a working roller (11) of the fifth rolling mill of the five-rack six-roller cold continuous rolling mill (1) and reduce the edge thinning of the strip steel;

4) after the strip steel passes through the shape meter (8), the thickness of the strip steel is detected through the thickness meter I (3) and the thickness meter II (4) and fed back to the PLC control unit (5), the PLC control unit (5) calculates the thickness difference of the two thickness meters, when the thickness difference is larger than 5 micrometers, the PLC control unit (5) controls the alarm unit (6) to work, equipment personnel checks the thickness meter with faults, when the thickness difference is smaller than or equal to 5 micrometers, the alarm unit (6) does not work, when the rolling thickness requirement is met, the strip steel is sheared through the flying shear and then coiled through one coiling position of the double-reel coiler (2), and when the strip steel is not sheared through the flying shear, the strip steel is coiled through the other coiling position of the double-reel coiler (2).

7. The method for controlling the cold continuous rolling thickness of the non-oriented silicon steel as claimed in claim 6, wherein the strip shape gauge (8) comprises a strip shape detection roller (81), a strip shape signal processor (82) and a strip shape detection computer (83), the strip shape detection roller (81) is connected with the strip shape signal processor (82) in a signal transmission way, the strip shape signal processor (82) is electrically connected with the strip shape detection computer (83), the strip shape detection roller (81) monitors the strip shape data of the steel strip in real time on line and converts the strip shape data into a strip shape analog electric signal, the strip shape signal processor (82) collects and digitally processes the strip shape analog signal, the strip shape detection computer (83) converts the strip shape digital electric signal into a digital force signal and compares the converted digital force signal with a target curve of a set middle wave mode to obtain the real-time strip shape deviation of the steel strip, and performing curve fitting on the plate shape deviation data to obtain a first order coefficient and a second order coefficient of a quadratic curve of the plate shape deviation, and controlling the inclination control quantity of a supporting roll (13) of a fifth rolling mill of the five-rack six-roll cold continuous rolling mill (1), the bending control quantity of a middle roll (12) and the bending control quantity of a working roll (11).

8. The method for controlling the cold continuous rolling thickness of the non-oriented silicon steel as set forth in claim 7, wherein the method for obtaining the quadratic curve of the real-time strip shape deviation of the strip steel comprises: the plate shape signal processor (82) processes signals obtained by measuring the plate shape detection rollers (81), converts the signals into distribution of transverse tensile stress of the strip steel, and further converts the distribution into transverse flatness of the strip steel, and specifically comprises the following steps:

firstly, the horizontal tension of the strip steel on the ith measuring section of the plate shape detection roller (81) is T_iHorizontal tensile stress of σ_iThe radial force on the ith measurement section actually measured by the plate shape detection roller (81) is F_iThe relationship between the two is as follows:

wherein：F_i-the radial force, N, on each measurement section;

σ_i-tensile stress, MPa, of each measurement section;

b, strip steel width, mm;

h-thickness of strip steel, mm;

theta represents the wrap angle between the strip steel and the plate-shaped roll;

T_i-the horizontal tension, N, of the strip on each measurement section;

then, the average radial pressure is calculated as:

the tensile stress deviation over each measurement segment is then:

wherein: t-total tension of the strip, N;

and further converting the distribution value of the tensile stress of the strip steel into flatness distribution by utilizing the elastic modulus E of the strip steel:

finally, the plate shape detection computer (83) can calculate the flatness distribution corresponding to each plate shape roller measuring section along the transverse direction of the strip steel according to the input Zhonglang plate shape target curve, the flatness distribution is subtracted from the actually measured flatness distribution to obtain the plate shape deviation, and the plate shape deviation is fitted into a quadratic curve by adopting a least square fitting method.

9. The cold continuous rolling thickness control method of nonoriented silicon steel according to claim 7, characterized in that the inclination control amount of the supporting roll (13) is determined as follows:

tilt＝a₁·C_tilta₁>1.0 or a₁<-1.0

wherein: tilt-tilt control amount;

a₁-first order coefficients of a quadratic fit curve of the shape deviation;

C_tilt-the coefficient of action of the inclination of the support rollers (13);

the roll bending control amount of the intermediate roll (12) and the roll bending control amount of the working roll (11) are determined according to the following formula:

other cases, g_W＝g_I＝0.5

Wherein: WB and IB are respectively the roll bending control quantity of the working roll (11) and the intermediate roll (12);

f_W、f_I-calculation references for the roll bending control of the work roll (11) and the intermediate roll (12), respectively;

g_W、g_I-roll bending control availability gain flags for the work roll (11) and the intermediate roll (12), respectively;

a₂-quadratic coefficients of the shape deviation fit curve;

G_W、G_I-taking G gain values for the bending of the work roll (11) and the bending of the intermediate roll (12), respectively_W＝0.24，G_I＝0.29；

C_W、C_I-bending coefficients of action of the work roll (11) and the intermediate roll (12), respectively;

F_W、F_I-measuring the roll bending forces of the work roll (11) and the intermediate roll (12).

10. The method for controlling the cold continuous rolling thickness of nonoriented silicon steel according to claim 6, characterized in that when the axial movement amount of the intermediate rolls (12) of the five-stand six-roll cold continuous rolling mill (1) is 0, the distance between the edge of the strip and the edge of the overlapped region of the roll bodies of the two opposite intermediate rolls (12) is 0.

Technical Field

The invention relates to the technical field of cold rolling forming of non-oriented silicon steel, in particular to cold continuous rolling equipment of non-oriented silicon steel and a thickness control method.

Background

The non-oriented silicon steel is widely applied to the stator and the rotor of the motor and has extremely high requirements on the tolerance precision and uniformity of the longitudinal thickness and the transverse thickness. When the current UCM rolling mill is used for producing non-oriented silicon steel, the qualification rate of the longitudinal thickness and the transverse thickness of the rolled strip steel is lower due to equipment and rolling process, and the method is mainly embodied in the following aspects: 1) 1 thickness gauge is arranged behind the last stand of the UCM rolling mill and used for monitoring the thickness of the intermediate point, and batch thickness inconsistency can be caused when the thickness gauges break down; 2) the non-oriented silicon steel has longer low-speed rolling time after coil splitting, the speed is manually increased by an operator after coil splitting, and the increased speed is too late, so that the head and tail excessive thickness is long, and the head and tail excessive thickness is long; 3) the UCM rolling mill has no work roll shifting function and only has a middle roll shifting function, and in order to ensure the plate shape, the middle roll shifting amount is small, the deflection of the work roll is large due to rolling force, and the transverse thickness control capability is poor; 4) when most of the prior UCM rolling mills produce non-oriented silicon steel, the roller shapes of the intermediate rollers and the working rollers are mainly flat rollers, and the working rollers of the first frame or the first two frames of the partial UCM rolling mills adopt tapered rollers with small taper, but because the cold-rolled silicon steel is seriously hardened and has large deformation resistance, serious elastic flattening can be generated between roller systems and between the working rollers and a steel belt, so that the transverse thickness difference after rolling is large;

5) the bending forces of the intermediate rolls and the working rolls of the front four frames of the UCM rolling mill are automatically set according to a secondary computer, the bending forces are usually small, so that the edge part is seriously thinned, and the target plate shape curve of the last frame of the UCM rolling mill is in a micro edge wave or straight mode, so that the bending force of the last frame is small, and the reduction of the edge part is not facilitated.

Disclosure of Invention

In order to solve the technical problems, the invention provides non-oriented silicon steel cold continuous rolling equipment and a thickness control method, which improve and adjust rolling equipment and a rolling process, improve the control force of the transverse thickness of a non-oriented silicon steel strip, reduce the length of the head-tail thickness out-of-tolerance of the steel strip, reduce the edge thinning of the non-oriented silicon steel strip and improve the longitudinal thickness qualification rate and the transverse thickness qualification rate of the steel strip.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the cold tandem rolling equipment for non-oriented silicon steel comprises a five-rack six-roller cold tandem rolling mill and a double-reel coiler, wherein the five-rack six-roller cold tandem rolling mill comprises a first cold rolling mill unit, a second cold rolling mill unit, a third cold rolling mill unit, a fourth cold rolling mill unit and a fifth cold rolling mill unit which are sequentially arranged along the rolling direction of strip steel, each cold rolling mill unit comprises a working roller, a middle roller and a supporting roller which are oppositely arranged and are sequentially arranged outwards from the center, the end parts of the middle rollers on each cold rolling mill unit are provided with chamfers, the end parts of the working rollers on the first cold rolling mill unit, the second cold rolling mill unit and the third cold rolling mill unit of the five-rack six-roller cold tandem rolling mill are provided with chamfers, and the chamfer heights of the working rollers of the first cold rolling mill unit and.

Furthermore, the length of the chamfer of the end part of the middle roller is 50 mm-100 mm, and the height of the chamfer of the middle roller is 0.3 mm-0.8 mm.

Furthermore, the chamfer length of the end parts of the working rolls of the first cold rolling unit and the second cold rolling unit is 275-390 mm, and the chamfer height is 0.4-0.7 mm; the chamfer length of the working roll end part of the second cold rolling unit is 275-390 mm, and the chamfer height is 0.2-0.4 mm.

Furthermore, a thickness gauge I and a thickness gauge II are sequentially arranged behind a fifth cold rolling unit of the five-rack six-roller cold continuous rolling mill along the rolling direction of the strip steel, the thickness gauge I and the thickness gauge II transmit detected thickness data of the strip steel to a PLC control unit, the PLC control unit calculates the thickness difference of the two thickness gauges, when the thickness difference is larger than 5 micrometers, the PLC control unit controls an alarm unit to work, and when the thickness difference is smaller than or equal to 5 micrometers, the alarm unit does not work.

Furthermore, one end of each of the two coiling mandrels of the double-reel coiling machine is connected with a servo motor, an encoder is arranged on each servo motor, and the encoders are electrically connected with a driving motor for driving the working rolls to rotate through a PLC control unit.

A method for controlling the thickness of cold continuous rolling of non-oriented silicon steel is applied to the cold continuous rolling equipment of the non-oriented silicon steel and comprises the following steps:

1) after uncoiling, straightening, welding and acid washing by an uncoiler, the non-oriented silicon steel strip enters a five-rack six-roller cold continuous rolling mill for rolling and is wound on a double-reel coiler by a guide roller;

2) after the head of the uncoiled non-oriented silicon steel strip is coiled on a coiling drum of a double-coiling drum coiling machine, an encoder on a servo motor detects 5-10 circles of coiling, a PLC control unit controls the rotating speed of a driving motor, so that a working roll of a five-rack six-roll cold continuous rolling machine is automatically accelerated to a certain stable speed of 200-400 m/min for rolling, and after the steel strip is stably coiled, the working roll of the five-rack six-roll cold continuous rolling machine is manually controlled to be accelerated to the range of 400-1000 m/min for rolling; in the rolling process, controlling the axial movement amount of the middle roll of the five-stand six-roll cold continuous rolling mill to be 0, controlling the bending force of the middle roll of the front four rolling mills of the five-stand six-roll cold continuous rolling mill to be 600-720 KN, and controlling the bending force of the working roll to be 400-500 KN;

3) after the strip steel passes through an outlet of a fifth rolling mill of the five-stand six-roller cold continuous rolling mill, a strip shape meter monitors strip shape data in real time and compares the strip shape data with a set target curve of a middle wave mode to obtain a first-order coefficient and a second-order coefficient of a quadratic curve of strip shape deviation, so as to control the inclination control quantity of a supporting roll, the bending control quantity of a middle roll and the bending control quantity of a working roll of the fifth rolling mill of the five-stand six-roller cold continuous rolling mill and reduce the edge thinning of the strip steel;

4) after the strip steel passes through the shape meter, the thickness of the strip steel is detected through a thickness meter I and a thickness meter II and fed back to a PLC control unit, the PLC control unit calculates the thickness difference of the two thickness meters, when the thickness difference is larger than 5 micrometers, the PLC control unit controls an alarm unit to work, equipment personnel troubleshoot the thickness meter with faults, when the thickness difference is smaller than or equal to 5 micrometers, the alarm unit does not work, when the rolling thickness requirement is met, the strip steel is sheared through a flying shear and then coiled through a coiling position of a double-reel coiling machine, and when the rolling thickness is not met, the strip steel is sheared through the flying shear and then coiled through another coiling position of the double-reel coiling machine.

The strip shape instrument comprises a strip shape detection roller, a strip shape signal processor and a strip shape detection computer, wherein the strip shape detection roller is connected with the strip shape signal processor in a signal transmission way, the strip shape signal processor is electrically connected with the strip shape detection computer, the strip shape detection roller monitors strip shape data of a steel strip in real time and converts the strip shape data into strip shape analog electric signals in an online way, the strip shape signal processor collects and digitally processes the strip shape analog signals, the strip shape detection computer converts the strip shape digital electric signals into digital force signals, compares the converted digital force signals with a set target curve of a middle wave mode to obtain real-time strip shape deviation of the steel strip, and performs curve fitting on the strip shape deviation data to obtain first-order coefficients and second-order coefficients of a quadratic curve of the strip shape deviation, and controls the inclination control quantity, the inclination control quantity and the inclination control quantity of a supporting roller of a fifth rolling mill of, The roll bending control quantity of the intermediate roll and the roll bending control quantity of the working roll.

Further, the method for obtaining the quadratic curve of the real-time strip shape deviation of the strip steel comprises the following steps: the plate-shaped signal processor processes signals obtained by measuring the plate-shaped detection rollers, converts the signals into distribution of transverse tensile stress of the strip steel, and then further converts the distribution into transverse flatness of the strip steel, and specifically comprises the following steps:

firstly, the horizontal tension of the strip steel on the ith measuring section of the plate-shaped detection roller is T_iHorizontal tensile stress of σ_iThe radial force on the ith measuring section actually measured by the shape detection roller is F_iThe relationship between the two is as follows:

wherein: f_i-the radial force, N, on each measurement section;

σ_i-tensile stress, MPa, of each measurement section;

b, strip steel width, mm;

h-thickness of strip steel, mm;

theta represents the wrap angle between the strip steel and the plate-shaped roll;

T_i-the horizontal tension, N, of the strip on each measurement section;

then, the average radial pressure is calculated as:

the tensile stress deviation over each measurement segment is then:

wherein: t-total tension of the strip, N;

and further converting the distribution value of the tensile stress of the strip steel into flatness distribution by utilizing the elastic modulus E of the strip steel:

finally, the plate shape detection computer can calculate the flatness distribution corresponding to each plate shape roller measuring section along the transverse direction of the strip steel according to the input Zhonglang plate shape target curve, the flatness distribution is subtracted from the actually measured flatness distribution to obtain the plate shape deviation, and the plate shape deviation is fitted into a quadratic curve by adopting a least square fitting method.

Further, the support roller inclination control amount is determined as follows:

tilt＝a₁·C_tilta₁>1.0 or a₁<-1.0

wherein: tilt-tilt control amount;

a₁-first order coefficients of a quadratic fit curve of the shape deviation;

C_tilt-support roll tilt coefficient of action;

the bending control quantity of the intermediate roll and the bending control quantity of the working roll are determined according to the following formulas:

other cases, g_W＝g_I＝0.5

Wherein: WB and IB are respectively the roll bending control quantity of the working roll and the middle roll;

f_W、f_I-calculated references for the work roll and intermediate roll bending control, respectively;

g_W、g_I-control availability gain flags for the work roll and the intermediate roll bending, respectively;

a₂-quadratic coefficients of the shape deviation fit curve;

C_W、C_Itaking C as the gain values of the work roll bending roll and the intermediate roll bending roll respectively_W＝0.24，G_I＝0.29；

C_W、C_I-the work roll and the intermediate roll bending coefficients, respectively;

F_W、F_I-measuring the roll bending forces of the work roll and the intermediate roll.

Further, when the axial movement amount of the intermediate roll of the five-stand six-roll cold continuous rolling mill is 0, the distance between the edge of the strip steel and the edge of the overlapping region of the roll bodies of the two opposite intermediate rolls is 0.

The invention has the beneficial effects that:

1. the invention sets chamfer angles at the end part of the middle roll in the five-stand six-roll cold continuous rolling mill, reduces the contact pressure between the middle roll and the two ends of the working roll, thereby reducing the rolling reduction of the edge part of the strip steel, being beneficial to reducing the thinning of the edge part of the strip steel, and being not beneficial to controlling the thinning of the edge part because the five-stand six-roll cold continuous rolling mill only has the roll shifting function of the middle roll and does not have the roll shifting function of the working roll.

2. According to the invention, the thickness gauge I and the thickness gauge II are sequentially arranged behind the fifth cold rolling unit along the rolling direction of the strip steel, the thickness gauge I and the thickness gauge II transmit the detected thickness data of the strip steel to the PLC control unit, the PLC control unit calculates the thickness difference of the two thickness gauges, when the thickness difference is greater than 5 microns, one of the two thickness gauges is in fault, the PLC control unit controls the alarm unit to work, the alarm unit reminds and informs equipment personnel of removing the thickness gauge in fault, when the thickness difference is less than or equal to 5 microns, the alarm unit does not work, the non-oriented silicon steel strip can be normally produced, the detection precision of the longitudinal thickness of the strip steel is ensured, batch thickness inconsistency is avoided, and the rolling quality of the strip steel is ensured.

3. The non-oriented silicon steel strip is always rolled at low speed in the process of shearing and coiling, but the time of low-speed rolling is longer, when the strip steel is coiled on a coiling machine, the traditional method is to achieve the requirement of rolling by manually increasing the speed by an operator, the speed is increased too late in manual operation, the head and tail thickness of the strip steel is over-tolerance and over-standard, the head and tail thickness is over-standard and longer, in the invention, one end of the coiling mandrel is connected with the servo motor, the coiling number of turns of the coiling mandrel is monitored by the encoder on the servo motor, when the strip steel is coiled for 5-10 circles, the tension is established on the strip steel, the PLC control unit controls the driving motor to drive the working roll to automatically increase the speed, the problem that the longitudinal thickness difference of the strip steel exceeds the standard and the length is too long due to too late speed increase is avoided, and an operator does not need to observe and operate in real time, so that the labor amount of the operator is reduced, and the rolling quality of the strip steel is improved.

4. The invention changes the target curve of the strip shape at the outlet of the last stand of the five-stand six-roller cold continuous rolling mill into a middle wave control mode, monitors the strip shape in real time through the strip shape meter, compares the strip shape with the target strip shape to obtain the curve of the strip shape deviation, and controls the inclination control quantity of the supporting roller, the bending control quantity of the middle roller and the bending control quantity of the working roller in a closed loop manner, so that the bending force of the middle roller and the working roller of the last stand is increased relative to the bending force of the micro edge wave and the straight mode, and the condition of reducing the edge part of the strip steel is further lightened.

In conclusion, the structure of the cold continuous rolling equipment and the cold continuous rolling process are improved and optimized, the measurement precision of the longitudinal thickness of the strip steel is guaranteed, the control force of the transverse thickness of the non-oriented silicon steel strip is improved, the length of the head-tail thickness out-of-tolerance of the strip steel is reduced, the edge thinning of the non-oriented silicon steel strip is reduced, and the qualification rate of the longitudinal thickness and the qualification rate of the transverse thickness of the strip steel are improved.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

FIG. 1 is a schematic structural view of a cold continuous rolling apparatus for non-oriented silicon steel according to the present invention;

FIG. 2 is a schematic diagram of the longitudinal thickness detection of the strip steel at the outlet of the five-stand six-roller cold continuous rolling mill and the control of the automatic speed increase of the working rollers of the five-stand six-roller cold continuous rolling mill after decoiling;

FIG. 3 is a control schematic diagram of the middle wave shape control mode according to the present invention;

FIG. 4 shows the horizontal tension T of the strip steel on the ith measuring section of the plate-shaped detecting roll in the invention_iWith radial force F_iSchematic structural diagram of (a);

FIG. 5 shows the horizontal tension T of the strip steel on the ith measuring section of the plate-shaped detecting roll in the invention_iWith radial force F_iSchematic diagram of the relationship between;

the labels in the above figures are: 1. the device comprises a five-frame six-roller cold continuous rolling mill, 11 working rollers, 12 intermediate rollers, 13 supporting rollers, 2 double-reel recoiling machines, 21 servo motors, 22 encoders, 3 thickness gauges I, 4 thickness gauges II, 5 PLC control units, 6 alarm units, 7 driving motors, 8 flatness gauges, 81 flatness detection rollers, 82 flatness signal processors and 83 flatness detection computers.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific implementation scheme of the invention is as follows: as shown in fig. 1, a cold continuous rolling apparatus for non-oriented silicon steel comprises a five-stand six-roll cold continuous rolling mill 1 and a double-reel coiler 2, wherein the five-stand six-roll cold continuous rolling mill 1 comprises a first cold rolling mill unit, a second cold rolling mill unit, a third cold rolling mill unit, a fourth cold rolling mill unit and a fifth cold rolling mill unit which are sequentially arranged along the rolling direction of strip steel, each cold rolling mill unit comprises a working roll 11, a middle roll 12 and a support roll 13 which are oppositely arranged and sequentially arranged from the center to the outside, chamfers are arranged at the end parts of the middle roll 12 on each cold rolling mill unit, the length of the chamfer at the end part of the middle roll 12 is 50 mm-100 mm, the height of the chamfer of the middle roll 12 is 0.3 mm-0.8 mm, the contact pressure between the middle roll 12 and the two ends of the working roll 11 is reduced, thereby reducing the rolling reduction of the edge of the strip steel, being beneficial to reducing the edge of the strip steel, and having the roll shifting function of, is not beneficial to controlling the edge thinning, and chamfers are arranged at the end parts of the working rolls 11 on the first, second and third cold rolling units of the five-stand six-roll cold continuous rolling mill 1, moreover, the chamfer height of the working rolls 11 of the first cold rolling unit and the second cold rolling unit is greater than that of the working rolls 11 of the third cold rolling unit, the chamfer length of the working rolls 11 on the first cold rolling unit, the second cold rolling unit and the third cold rolling unit is set according to the width of the strip steel and is usually 275 mm-390 mm, the chamfer height of the end parts of the working rolls 11 of the first cold rolling unit and the second cold rolling unit is 0.4-0.7 mm, the chamfer height of the end parts of the working rolls 11 of the second cold rolling unit is 0.2-0.4 mm, and the strip breakage of the rolling mill is avoided by optimizing the roll shape of the working rolls, and the reduction of the edge of the strip steel is further reduced, and the reduction of the edge of the strip steel is effectively controlled, so that the transverse thickness difference of the non-oriented silicon steel strip is reduced.

Specifically, as shown in fig. 2, a thickness gauge i 3 and a thickness gauge ii 4 are sequentially arranged behind a fifth cold rolling mill group of a five-stand six-roll cold continuous rolling mill 1 along a rolling direction of strip steel, the thickness gauge i 3 and the thickness gauge ii 4 transmit detected thickness data of the strip steel to a PLC control unit 5, the PLC control unit 5 calculates a thickness difference between the two thickness gauges, when the thickness difference is larger than 5 μm, it indicates that one of the two thickness gauges has a fault, the PLC control unit 5 controls the alarm unit 6 to work, wherein the alarm unit 6 can be set as an alarm, can remind and inform equipment personnel of removing a thickness gauge with faults through sound and light, when the thickness difference is less than or equal to 5 mu m, the alarm unit 6 does not work, the non-oriented silicon steel strip can be normally produced, the detection precision of the longitudinal thickness of the strip steel is ensured, the batch thickness inconsistency is avoided, and the rolling quality of the strip steel is ensured.

Specifically, low-speed rolling is always performed in the process of shearing and splitting the non-oriented silicon steel strip, the purpose is to stably roll the strip steel on a coiler in place, but because the low-speed rolling time is long, after the strip steel is rolled on the coiler, the traditional method is to achieve the rolling requirement by manually increasing the speed by an operator, the speed is increased too late in manual operation, the head-tail thickness out-of-tolerance length of the strip steel is long, and the head-tail thickness out-of-tolerance length is long, but the invention is provided with the double-reel coiler 2, on one hand, the double-reel coiler 2 can increase the coiling capacity of the strip steel and can also be used for marking and distinguishing the coiling positions of qualified and unqualified strip steel, one end of two coiling mandrels of the double-reel coiler 2 is connected with a servo motor 21, the servo motor 21 is provided with an encoder 22, as shown in figure 2, the encoder 22 is electrically connected with a driving motor 7 for driving the working roller 11 to rotate through, the coiling turns of the coiling mandrel are monitored through the encoder 22 on the servo motor 21, when strip steel is coiled for 5-10 turns, the strip steel establishes tension, the PLC control unit 5 controls the driving motor 7 to drive the working roller 11 to automatically increase the speed, the problem that the longitudinal thickness difference of the strip steel exceeds the standard and the length is too long due to too late increase of the speed is avoided, an operator does not need to observe and operate in real time, the labor capacity of the operator is reduced, and the rolling quality of the strip steel is improved.

The method for controlling the cold continuous rolling thickness of the non-oriented silicon steel by using the non-oriented silicon steel cold continuous rolling equipment comprises the following steps:

1) the non-oriented silicon steel strip is uncoiled by an uncoiler, straightened, welded and pickled, then enters a five-rack six-roller cold continuous rolling mill for rolling, and is wound on a double-reel coiler 2 through a guide roller.

2) The strip head of the uncoiled non-oriented silicon steel strip is coiled on the coiling drum of the double-coiling drum coiling machine 2, after an encoder 22 on a servo motor 21 detects 5-10 turns of coiling, the strip steel establishes tension, a PLC control unit 5 controls the rotating speed of a driving motor 7, so that a working roller 11 of a five-rack six-roller cold continuous rolling machine 1 is automatically accelerated to a certain stable speed of 200-400 m/min for rolling, the problem that the longitudinal thickness difference of the strip steel exceeds the standard length due to too late acceleration is avoided, the real-time observation operation of an operator is not needed, the labor amount of the operator is reduced, the rolling quality of the strip steel is improved, after the strip steel is stably coiled, the working roller 11 of the five-rack six-roller cold continuous rolling machine 1 is manually controlled to accelerate to the range of 400-1000 m/min for rolling, and the purpose of improving the rolling efficiency is achieved.

And in the rolling process, the axial movement amount of the middle roll 12 of the five-stand six-roll cold continuous rolling mill 1 is controlled to be 0, namely the distance between the edge of the strip steel and the edge of the overlapped area of the roll bodies of two opposite middle rolls 12 is controlled to be 0, at the moment, the harmful contact part of the working roll and the supporting roll is completely eliminated, the deflection of the working roll caused by rolling force is reduced, and the edge thinning amount of the strip steel is reduced. On the premise of avoiding strip breakage of the rolling mill, the roll bending force of the middle roll 12 of the front four rolling mills of the five-stand six-roll cold continuous rolling mill 1 is controlled to be 600 KN-720 KN manually, and the roll bending force of the working roll 11 is controlled to be 400 KN-500 KN.

3) As shown in fig. 3, after the strip passes through the fifth rolling mill outlet of the five-stand six-roll cold continuous rolling mill 1, the strip shape meter 8 monitors the strip shape data in real time and compares the strip shape data with the target curve of the set middle wave mode to obtain the first order coefficient and the second order coefficient of the quadratic curve of the strip shape deviation, so as to control the inclination control amount of the back-up roll 13, the bending control amount of the middle roll 12 and the bending control amount of the work rolls 11 of the fifth rolling mill of the five-stand six-roll cold continuous rolling mill 1, thereby reducing the edge thinning of the strip. Specifically, as shown in fig. 1, the strip shape meter 8 includes a strip shape detection roll 81, a strip shape signal processor 82 and a strip shape detection computer 83, the strip shape detection roll 81 is connected with the strip shape signal processor 82 in a signal transmission manner, the strip shape signal processor 82 is electrically connected with the strip shape detection computer 83, the strip shape detection roll 81 monitors strip shape data of a steel strip on line in real time and converts the strip shape data into strip shape analog electric signals, the strip shape signal processor 82 collects and digitally processes the strip shape analog signals, the strip shape detection computer 83 converts the strip shape digital electric signals into digital force signals, compares the converted digital force signals with a set target curve of a middle wave mode to obtain real-time strip shape deviation of the steel strip, and performs curve fitting on the strip shape deviation data to obtain a first order coefficient and a second order coefficient of a quadratic curve of the strip shape deviation, and controls an inclination control amount of a support roll 13 of a fifth rolling mill of the five-stand six-roll cold, The roll bending control amount of the intermediate roll 12 and the roll bending control amount of the work roll 11.

The specific control method comprises the following steps:

(a) signal processing and conversion

The strip shape signal processor 82 processes the signals measured by the strip shape detection rollers 81, converts the signals into the distribution of the strip steel transverse tensile stress, and then further converts the distribution into the strip steel transverse flatness distribution, specifically:

first, as shown in FIGS. 4 and 5, the horizontal tension of the strip on the ith measuring section of the strip shape detecting roll 81 is T_iHorizontal tensile stress of σ_iThe radial force on the i-th measurement section actually measured by the shape detection roller 81 is F_iThe relationship between the two is as follows:

wherein: f_i-the radial force, N, on each measurement section;

σ_i-tensile stress, MPa, of each measurement section;

b, strip steel width, mm;

h-thickness of strip steel, mm;

theta represents the wrap angle between the strip steel and the plate-shaped roll;

T_i-the horizontal tension, N, of the strip on each measurement section;

then, the average radial pressure is calculated as:

the tensile stress deviation over each measurement segment is then:

wherein: t-total tension of the strip, N;

and further converting the distribution value of the tensile stress of the strip steel into flatness distribution by utilizing the elastic modulus E of the strip steel:

(b) calculation of plate shape deviation

The strip shape detection computer 83 can calculate the flatness distribution corresponding to each strip shape roller measuring section in the strip steel transverse direction according to the input Zhonglang strip shape target curve, subtract the actually measured flatness distribution to obtain the strip shape deviation, and fit the strip shape deviation into a quadratic curve by adopting a least square fitting method.

(c) Calculation of regulation and control quantity of plate-shaped control actuator

The inclination control amount of the support roller 13 is determined as follows:

tilt＝a₁·C_tilta₁>1.0 or a₁<-1.0

wherein: tilt-tilt control amount;

a₁-first order coefficients of a quadratic fit curve of the shape deviation;

C_tiltthe coefficient of action of the inclination of the support rollers 13;

the roll bending control amount of the intermediate roll 12 and the roll bending control amount of the work roll 11 are determined as follows:

other cases, g_W＝g_I＝0.5

Wherein: WB and IB are respectively the roll bending control quantity of the working roll 11 and the middle roll 12;

f_W、f_Icalculated references for the roll bending control of the work roll 11 and the intermediate roll 12, respectively;

g_W、g_I-roll bending control availability gain flags for the work roll 11 and the intermediate roll 12, respectively;

a₂-quadratic coefficients of the shape deviation fit curve;

G_W、G_Igain values for the rolls 11 and 12, respectively, and G_W＝0.24，G_I＝0.29；

C_W、C_IThe roll bending coefficients of action of the work roll 11 and of the intermediate roll 12, respectively;

F_W、F_Ithe roll bending forces of the work roll 11 and the intermediate roll 12 are measured.

4) After the strip steel passes through the shape meter 8, the thickness of the strip steel is detected through the thickness meter I3 and the thickness meter II 4 and fed back to the PLC control unit 5, the PLC control unit 5 calculates the thickness difference of the two thickness meters, when the thickness difference is larger than 5 micrometers, the PLC control unit 5 controls the alarm unit 6 to work, equipment personnel inspects the thickness meter with faults, when the thickness difference is smaller than or equal to 5 micrometers, the alarm unit 6 does not work, when the rolling thickness requirement is met, the strip steel is sheared through the flying shears and then coiled through one coiling position of the double-reel coiler 2, and when the rolling thickness is not met, the strip steel is sheared through the flying shears and then coiled through the other coiling position of the double-reel coiler 2.

The non-oriented silicon steel is rolled on a UCM rolling mill, the rolling technology is adopted, the longitudinal thickness qualified rate is improved to 99.6 percent from 98 percent, the proportion of the transverse thickness difference less than or equal to 8 mu m is improved to 85 percent from 50 percent, and the thickness tolerance is favored by users.

In conclusion, the structure of the cold continuous rolling equipment and the cold continuous rolling process are improved and optimized, the measurement precision of the longitudinal thickness of the strip steel is guaranteed, the control force of the transverse thickness of the non-oriented silicon steel strip is improved, the length of the head-tail thickness out-of-tolerance of the strip steel is reduced, the edge thinning of the non-oriented silicon steel strip is reduced, and the qualification rate of the longitudinal thickness and the qualification rate of the transverse thickness of the strip steel are improved.

While the foregoing is directed to the principles of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.