CN116159868A - Eighteen-roller machine side supporting force energy control method based on edge drop control - Google Patents

Abstract

The invention discloses an eighteen-roller mill side supporting force energy control method based on edge drop control, and belongs to the technical field of multi-roller mill control. The method relies on a eighteen-roller rolling mill platform with side supporting force-position measuring and controlling functions, and comprises a displacement calibrating link with working roller eccentric detection and callback and a side supporting roller system force control link with side drop control capability. According to the invention, the side support roller pressure oil cylinders are arranged at the bearing seats of the side support roller systems, the deflection control function of the side support roller systems is fully exerted through hydraulic adjustment, the effect of applying non-uniform side support force to the working rollers of the eighteen-roller rolling mill is realized, and finally, the fine adjustment of the edge region of the roller seam is achieved. The control method has universality, can be used for carrying out small-range equipment transformation on the existing eighteen-roller rolling mill, and can be used for adjusting the side supporting force energy state according to process data detection, so that the edge drop state of rolled pieces of the eighteen-roller rolling mill is effectively improved.

Description

A side support force control method for eighteen-high rolling mill based on edge drop control

Technical Field

The invention belongs to the technical field of multi-roller rolling mill control, and in particular relates to a side support force control method of an eighteen-roller rolling mill based on edge drop control.

Background Art

Because thin strips and ultra-thin strips have characteristics such as a large width-to-thickness ratio, they have derived high product added value and are widely used in multiple fields such as aerospace, automobiles and ships. However, the large width-to-thickness ratio also makes the process window of such products small, and it is very easy to form severe work hardening during the processing, making it difficult to be further thinned. The eighteen-roll mill has smaller working rolls and can complete the rolling production of thin strips (including ultra-thin strips) under the support of a tower roller system. Therefore, it has become the main model for the current production of thin strips and ultra-thin strip products. In response to the production needs of thin strips, the eighteen-roll mill must ensure that the same plate difference of the rolled strip is accurately reduced on the basis of no plate shape problems in the produced thin strips, that is, to achieve rectangular section control in the strip production process.

In order to achieve this control goal, the solutions proposed by the industry can be summarized into two categories: one is the plate shape mechanism control method, and the other is the new roll shape design method. The plate shape mechanism control method often uses control methods such as bending rolls and shifting rolls to dynamically adjust the roll gap of the 18-roll mill, and promotes the roll gap to be rectangular by changing the roll deflection and improving the length of the harmful contact area between the rolls. The new roll shape design method is to improve the length of the contact area between the rolls or the state of the unloaded roll gap by developing double-taper and single-taper roll shapes with the help of the roll shape design and optimization of the intermediate rolls and working rolls, and then obtain a rectangular section by developing double-taper and single-taper roll shapes. All of the above methods have achieved good application results, but the plate shape mechanism control method requires driving an external control device to force the roll to deform. Its application will aggravate the wear of the roll and bring a greater burden to the roll bearings. Although the new roll shape design method solves the problem of non-rectangular cross-section of the plate and strip from the root, it is difficult to achieve the design goal of "one roll shape corresponding to all specifications of products".

The tower roll system in the 18-high rolling mill involves the middle roll system and the auxiliary roll systems on both sides. The coordinated control of the three-roll system is both the control difficulty of this type of unit and the effective gain that distinguishes this type of unit from other units. The side support roll system has a potential side drop control function, and it is urgent to provide a side drop control strategy and method for the 18-high rolling mill based on the side roll system.

Summary of the invention

The present invention provides a side support force control method for an 18-high rolling mill based on edge drop control. The method can be used on an 18-high rolling mill after the roll system is calibrated and positioned as a whole, and for each rolling pass, according to the changes in the plate crown and edge drop value before and after rolling, the force and energy state of each side support roll system is independently adjusted in a branch path, thereby changing the working roll bearing roll shape to enhance the edge drop control capability of the 18-high rolling mill.

In order to solve the above technical problems, the present invention provides the following technical solutions:

The method comprises the following steps:

S1. Arrange an 18-high rolling mill platform with side support force-position measurement and control functions; specifically,

The platform includes a rolling mill main body device and a detection device;

The main device of the rolling mill includes a left coiler, a left guide roller, an 18-roller rolling mill, a right guide roller, and a right coiler;

The detection device includes a left convexity meter, a right convexity meter, a displacement sensor group and a pressure sensor group;

The displacement sensor group includes a left upper support roller system displacement sensor group, a right upper support roller system displacement sensor group, a left lower support roller system displacement sensor group, a right lower support roller system displacement sensor group, an upper working roller displacement sensor group and a lower working roller displacement sensor group;

The pressure sensor group includes a left upper support roller pressure sensor group, a right upper support roller pressure sensor group, a left lower support roller pressure sensor group, and a right lower support roller pressure sensor group;

The left side convexity meter is arranged between the left guide roller and the 18-roller rolling mill;

The right side convexity meter is arranged between the right guide roller and the 18-roller rolling mill;

S2, performing displacement calibration of working roll eccentricity detection and callback; specifically, the steps include the following:

S21, before starting rolling, the 18-high rolling mill is pressed down to a zero roll gap state, and sensors at all levels are cleared;

S22, executing rolling, and collecting horizontal displacement signals I _UDX-1 and I _UDX-2 of two displacement sensors on the driving side of the upper working roll, horizontal displacement signals I _UWX-1 and I _UWX-2 of two displacement sensors on the operating side of the upper working roll, vertical displacement signals I _UDY-1 and I _UDY-2 of two displacement sensors on the driving side of the upper working roll, vertical displacement signals I _UWY-1 and I UWY _{-2 of two displacement sensors on the operating side of the upper working roll; horizontal displacement signals I DDX-1 and I DDX-2 of two displacement sensors on the driving side of the lower working roll, horizontal displacement signals I DWX-1 and I DWX -2} of two displacement sensors on the operating side of the lower working roll, vertical displacement signals I DDY _{- 1} and I _{DDY -2} of two displacement sensors on the driving side of the lower working roll, vertical displacement signals I _{DWY-1 and} I _DWY- 2 of two displacement sensors on the operating side of the lower working roll, and performing signal analysis;

S23, adjusting the working roll according to the displacements _XW and _YW and the eccentricity angle α obtained by the analysis in S2;

Assume the working roll stability condition:

|X _W |≤ΔX, |X _D |≤ΔX, |Y _W |＝|Y _D |≤ΔY

Among them, ΔX is the calibration value, which is 2μm; ΔY is the calibration value, which is 2μm;

Use the first oil cylinder on the transmission side and the first oil cylinder on the operating side of the left support roller and the right support roller to control the movement of the oil cylinder in the corresponding direction, and always observe the value of the displacement sensor of the working roller. When the measured value meets the working roller stability condition, the callback is successful;

S3, performing force control of the side support roller system; specifically, the steps include the following:

S31. Before rolling begins, set the steel coil A to be rolled n times, the first rolling reduction rate is N1, the second rolling reduction rate is N2, and the rolling reduction rate of the nth rolling reduction rate is Nn;

And, the reduction rate satisfies

Start rolling, monitor the edge drop of the transmission side and the operating side of the incoming material and the rolled strip in real time, in the first rolling, record the edge drop of the incoming material transmission side as C _di , the edge drop of the incoming material operating side as C _wi , the edge drop of the rolled transmission side as C _do , and the edge drop of the rolled operating side as C _wo , set the final target edge drop of the transmission side as C _d , and the final target edge drop of the operating side as C _w ;

S32, arranging pressure sensors on the support rolls on both sides of the 18-roller single-stand reversible rolling mill, including a horizontal pressure sensor and a plumb pressure sensor;

The horizontal pressure sensor is arranged at the horizontal position of the roller diameter bearing of the first layer of the side support roller system on the inlet side and the outlet side, and collects the inlet transmission side horizontal pressure value Fi-d-R, the inlet operation side horizontal pressure value Fi-c-R, the outlet transmission side horizontal pressure value Fo-d-R, and the outlet operation side horizontal pressure value Fo-c-R;

The vertical pressure sensor is arranged at the vertical position of the roller diameter bearing of the first layer of the side support rollers on the inlet and outlet sides, and collects the inlet transmission side vertical pressure value Fi-d-H, the inlet operation side vertical pressure value Fi-c-H, the outlet transmission side vertical pressure value Fo-d-H, and the outlet operation side vertical pressure value Fo-c-H;

S33, set the same plate difference on the transmission side to C _40-D , C _30-D , C _25-D , the same plate difference on the operation side to C _40-W , C _30-W , C _25-W , the plate thickness T, the plate width W, and the same plate difference level of the hot rolling feed meets the following conditions to be qualified:

|C _xD -C _xW |≤C ₁

In the formula, x is 40, 30, 25 respectively; C ₁ is the calibration value, generally 5μm;

C ₄₀ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 40 μm from the edge of the strip, C ₃₀ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 30 μm from the edge of the strip, C ₂₅ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 25 μm from the edge of the strip, D means the transmission side, and W means the operating side;

S34, predicting the same board difference state according to the measured value;

Measure the same plate difference C _40-D , C _30-D , C _25-D on the transmission side after rolling, and the same plate difference C _40-W , C _30-W , C _25-W on the operating side;

If |C _xD -C _xW |≤C ₁ , x∈[40, 30, 25], C _x is called plate-difference symmetric;

If |C _XD -C _XW |＞C ₁ , x∈[40,30,25], C _x is called asymmetric with the same plate difference;

S35, regulating according to the detection result of S34;

The displacement of all cylinders of the side support rollers is controlled by the PID system. During the rolling process, the side support rollers are adjusted to the preset rolling position. The manual control accuracy of the cylinders on the operating table is set to L _min = 0.1mm, and the displacement of the cylinders in one adjustment is specified not to exceed L _max = 0.5mm. When the cylinder displacement is L = 0.5mm, the control is stopped and data collection is continued. After feedback that there is no data deviation, the control is continued.

S36, check and record again the horizontal displacement _Xw of the working roll operating side, the horizontal displacement _Xd of the working roll driving side, the vertical displacement _Yw of the working roll operating side and the vertical displacement _Yd of the working roll driving side; assume that the rightward displacement and the upward displacement are the positive direction; the stability condition is:

|X _W |≤ΔX,|X _D |≤ΔX,|Y _W |＝|Y _D |≤ΔY

Ensure that the working rolls meet stable conditions;

S37, check and record the transmission side edge drop value C _do and the operation side edge drop value C _wo after rolling again; when the detected edge drop values satisfy the following two formulas at the same time, the edge drop value detection of this pass is considered to meet the standard:

_Cwo≤ ( _Cw - _Cwi )*Nx

C _do ≤(C _d -C _di )*Nx

Wherein, Nx is the reduction rate of the Xth pass.

Each displacement sensor group in S1 adopts a configuration form of a group of two detection elements, and the two detection elements are respectively located at the end position of the operating side and the end position of the transmission side; the detection element at each side support position is composed of two displacement sensors, including a side support horizontal displacement sensor and a side support vertical displacement sensor; the detection elements of the upper working roll and the lower working roll are composed of four displacement sensors, which are respectively arranged in the horizontal direction and vertical direction of the roll diameter on the transmission side and the operating side of the working roll.

Each pressure sensor group in S1 adopts a configuration form of a group of two detection elements, and the two detection elements are respectively located at the lower side of the side support hydraulic cylinder on the operating side and the transmission side; the detection element at each position is composed of two pressure sensors, including a side support horizontal pressure sensor and a side support vertical pressure sensor.

The signal analysis in S22 is specifically as follows:

S221, calculating the eccentricity of the transmission side and the operating side of the upper working roll and the lower working roll;

及铅12垂2位移

＝用y1两2y个2传感器信号的均值表示：Two sensors are arranged on each side of the working roll to measure the horizontal displacement of the working roll.

and plumb 12 vertical 2 displacement

= Expressed by the mean value of the y1 and 2y2 sensor signals:

Among them, x ₁ and x ₂ are the horizontal displacement signals of the two displacement sensors on each side of the working roll, and y ₁ and y ₂ are the vertical displacement signals of the two displacement sensors on each side of the working roll;

S222. Calculate the eccentricity angle α:

Among them: _XW is the horizontal displacement of the working roll operating side, _XD is the horizontal displacement of the working roll driving side, and _YW is the vertical displacement of the working roll operating side.

In the S31, during the uncoiling and winding stages and the strip head and strip tail rolling stages, the value reduction of each side is collected and recorded but not included in the control.

The prediction process in S34 is specifically as follows:

S341. If C40, C30, and C25 are all symmetrical with the same plate difference, the plates on the operating side and the transmission side are evenly stressed during rolling, and the symmetry of the transverse thickness of the plates is well controlled. In the subsequent regulation, all the cylinders of the left and right rollers are adjusted synchronously to improve the consistency of the roll gap on the operating side and the transmission side, and the plate and strip thickness on the operating side and the transmission side change consistently after rolling;

S342, if C40, C30, C25 are all asymmetric with the same plate difference, the uneven force on the operating side and the transmission side of the working roll leads to uneven force on the plates on the operating side and the transmission side during rolling, and the symmetry of the transverse thickness of the plate is poorly controlled. In the subsequent regulation, all the cylinders of the left and right side rolls are adjusted respectively, and the real-time data is detected until C40, C30, C25 are all symmetric with the same plate difference;

S343. If several items of same-plate differences are symmetrical and several items of same-plate differences are asymmetrical between C40, C30 and C25, continue to collect data. If the asymmetrical phenomenon of the same-plate differences disappears, proceed according to step S341. If the symmetrical phenomenon of the same-plate differences disappears, proceed according to step S342. If several items of same-plate differences are still symmetrical and several items of same-plate differences are asymmetrical, then:

a. If the C40 plate difference is symmetrical, and the C30 and C25 plate differences are asymmetrical, in the subsequent regulation, it is necessary to adjust all the cylinders of the left and right rollers respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetrical conditions;

b. If the C40 and C30 have symmetric plate differences, but the C25 has asymmetric plate differences, in subsequent regulation, it is necessary to adjust the first oil cylinders on the left and right roller operating sides and the transmission side respectively, and detect real-time data until C40, C30, and C25 all meet the symmetry conditions;

c. If the C40 and C25 have symmetrical plate differences, but the C30 has asymmetrical plate differences, in subsequent regulation, it is necessary to adjust the second oil cylinders on the operating side and the transmission side of the left and right rollers respectively, and detect real-time data until C40, C30, and C25 all meet the symmetrical conditions;

d. If the C25 plate difference is symmetrical, and the C30 and C40 plate differences are asymmetrical, in the subsequent regulation, it is necessary to adjust the second oil cylinders on the left and right roller operating sides and the transmission side respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetrical conditions;

e. If the C30 and C25 have symmetrical plate differences, but the C40 has asymmetrical plate differences, in the subsequent regulation, it is necessary to adjust the second oil cylinders on the operating side and the transmission side of the left and right rollers respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetrical conditions;

f. If the C30 plate difference is symmetrical, and the C40 and C25 plate differences are asymmetrical, it is considered that the rolling mill has a fault. After the rolling of this coil of steel is completed, the rolling should be stopped immediately and the rolling mill should be inspected and repaired.

The S36 specifically includes:

S361. If |X _W |≥ΔX, |X _D |≥ΔX, |Y _W |＝|Y _D |≤ΔY, it means that the working roll is laterally offset again during the rolling process, and the first oil cylinder on the upper right operating side, the first oil cylinder on the upper left operating side, the first oil cylinder on the upper left transmission side, and the first oil cylinder on the upper right transmission side are pushed and adjusted until the displacement sensor value meets the stability condition;

S362. If |X _W |≥ΔX, |X _D |≥ΔX, |Y _W |＝|Y _D |≥ΔY, it means that the working roll has eccentric displacement during the rolling process, and the eccentric angle α is calculated. If the working roll deviates to the right, the pressing angle of the right support roll is adjusted to be consistent with α, and the first oil cylinder on the upper right operating side and the first oil cylinder on the upper right transmission side are slowly pushed forward, and the adjustment is continued until the displacement sensor value meets the stability condition;

S363. If |X _W |≤ΔX, |X _D |≤ΔX, |Y _W |＝|Y _D |≤ΔY, and the stability condition is met, then continue to maintain.

The above mentioned related cylinders are arranged as follows:

The center line of the first oil cylinder on the operating side is perpendicular to the center line of the side support roller and is 232 to 235 mm away from the operating side edge of the side support roller;

The center line of the second oil cylinder on the operating side is perpendicular to the center line of the side support roller and is 432 to 435 mm away from the operating side edge of the side support roller;

The center line of the first oil cylinder on the transmission side is perpendicular to the center line of the side support roller and is 232 to 235 mm away from the transmission side edge of the side support roller;

The center line of the second oil cylinder on the transmission side is perpendicular to the center line of the side support roller and is 432 to 435 mm away from the transmission side edge of the side support roller.

The side support rollers are arranged symmetrically on the left and right sides.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The side support roller is used to adjust the edge drop of the plate and strip, which is suitable for all types of plates and strips. The adjustment process is simple and can be adjusted while rolling, which plays a significant role in the multi-pass rolling process of the plate and strip. The entire control process forms a closed loop and can cover the entire process of plate and strip rolling.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a process flow chart of a method for controlling the side support force of an 18-high rolling mill based on edge drop control according to the present invention;

FIG2 is a schematic diagram of the mechanism layout of the eighteen-high rolling mill of the present invention;

FIG3 is a schematic diagram of the side support rolls of the eighteen-high rolling mill of the present invention;

FIG4 is a schematic diagram of the operating side of the working rolls on the 18-high rolling mill of the present invention;

FIG5 is a schematic diagram of the eccentricity of the working rolls of the eighteen-high rolling mill according to an embodiment of the present invention.

Among them: 1-left curling; 2-left guide roller; 3-left convexity meter; 4-18-roller rolling mill; 5-right convexity meter; 6-right guide roller; 7-right curling; 8-upper left operating side first cylinder; 9-upper left operating side second cylinder; 10-upper left transmission side second cylinder; 11-upper left transmission side first cylinder;

4-1. Side support vertical displacement sensor; 4-2. Side support horizontal displacement sensor; 4-3. Side support vertical pressure sensor; 4-4. Side support horizontal pressure sensor; 4-5. Upper working roll operating side vertical displacement sensor 1; 4-6. Upper working roll operating side vertical displacement sensor 2; 4-7. Upper working roll operating side horizontal displacement sensor 1; 4-8. Upper working roll operating side horizontal displacement sensor 2.

DETAILED DESCRIPTION

In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

The invention provides a method for controlling the side support force of an 18-high rolling mill based on edge drop control.

As shown in FIG1 , the method comprises the following steps:

S1. Arrange an 18-high rolling mill platform with side support force-position measurement and control functions; specifically,

As shown in FIG2 , the platform includes a rolling mill main body device and a detection device;

The main device of the rolling mill includes a left coiler 1, a left guide roller 2, an 18-high rolling mill 4, a right guide roller 6, and a right coiler 7;

The detection device includes a left convexity meter 3, a right convexity meter 5, a displacement sensor group and a pressure sensor group;

The displacement sensor group includes a left upper support roller system displacement sensor group, a right upper support roller system displacement sensor group, a left lower support roller system displacement sensor group, a right lower support roller system displacement sensor group, an upper working roller displacement sensor group and a lower working roller displacement sensor group;

The pressure sensor group includes a left upper support roller pressure sensor group, a right upper support roller pressure sensor group, a left lower support roller pressure sensor group, and a right lower support roller pressure sensor group;

The left convexity meter 3 is arranged between the left guide roller 2 and the 18-roller rolling mill 4, and is used to measure the edge drop value of the left side plate;

The right convexity meter 5 is arranged between the right guide roller 6 and the 18-roller rolling mill 4, and is used to measure the edge drop value of the right side plate;

S2, performing displacement calibration of working roll eccentricity detection and callback; specifically, the steps include the following:

S21, before starting rolling, the 18-high rolling mill is pressed down to a zero roll gap state, and sensors at all levels are cleared;

S22, executing rolling, and collecting horizontal displacement signals I _UDX-1 and I _UDX-2 of two displacement sensors on the driving side of the upper working roll, horizontal displacement signals I _UWX-1 and I _UWX-2 of two displacement sensors on the operating side of the upper working roll, vertical displacement signals I _UDY-1 and I _UDY-2 of two displacement sensors on the driving side of the upper working roll, vertical displacement signals I _UWY-1 and I UWY _{-2 of two displacement sensors on the operating side of the upper working roll; horizontal displacement signals I DDX-1 and I DDX-2 of two displacement sensors on the driving side of the lower working roll, horizontal displacement signals I DWX-1 and I DWX -2} of two displacement sensors on the operating side of the lower working roll, vertical displacement signals I DDY _{- 1} and I _{DDY -2} of two displacement sensors on the driving side of the lower working roll, vertical displacement signals I _{DWY-1 and} I _DWY- 2 of two displacement sensors on the operating side of the lower working roll, and performing signal analysis; specifically,

Calculate the eccentricity of the upper and lower working rolls on the transmission and operating sides;

＝及铅12垂2位移

＝用y1两2y个2传感器信号的均值表示：Two sensors are arranged on each side of the working roll to measure the horizontal displacement of the working roll.

= and plumb 12 vertical 2 displacement

= Expressed by the mean value of the y1 and 2y2 sensor signals:

Among them, x ₁ and x ₂ are the horizontal displacement signals of the two displacement sensors on each side of the working roll, and y ₁ and y ₂ are the vertical displacement signals of the two displacement sensors on each side of the working roll;

The following is an example of the working roll:

As shown in Figure 5, take point A on the transmission side of the upper working roll, and move to position A’ after the upper working roll is offset; take point B on the operating side of the upper working roll, and move to position B’; take point C on the axis of the operating side of the upper working roll, and move to position C’ after the upper working roll is offset. The movement of the upper working roll is divided into two parts, one is the horizontal rotation displacement of the upper working roll, and the other is the eccentric displacement of the upper working roll. Assume that the displacement direction of the sensor is to the right as the positive direction.

When the upper working roll makes a horizontal rotation displacement, the vertical displacement is 0, that is, y _A-A' = 0, y _B-B' = 0, x _A-A' = x ₁ , x _B-B' = -x ₁ ,

When the upper working roll makes eccentric motion, x _C-C' = x ₂ , y _C-C' = Y _W

So the sensor finally measures _XW = _x2 - _x1 , _XD = _x2 + _x1 , _YW = _YD

We can get:

Among them: _XW is the horizontal displacement of the working roll operating side, _XD is the horizontal displacement of the working roll driving side, and _YW is the vertical displacement of the working roll operating side.

The same applies to the lower working roll.

S23, adjusting the working roll according to the displacements _XW and _YW and the eccentricity angle α obtained by the analysis in S2;

In the actual production process, the displacements _XW and _YW are both small amounts in the micron range. Assume that the working roll stability condition is:

|X _W |≤ΔX,|X _D |≤ΔX,|Y _W |＝|Y _D |≤ΔY

Among them, ΔX is the calibration value, which is 2μm; ΔY is the calibration value, which is 2μm;

The callback means that the first oil cylinder on the transmission side and the first oil cylinder on the operating side of the left support roller and the right support roller are used to control the movement of the oil cylinder in the corresponding direction, and the value of the displacement sensor is always observed. When the measured value meets the working roller stability condition, the callback is successful;

S3, performing force control of the side support roller system; specifically, the steps include the following:

S31. Before rolling begins, set the steel coil A to be rolled n times, the first rolling reduction rate is N1, the second rolling reduction rate is N2, and the rolling reduction rate of the nth rolling reduction rate is Nn;

And, the reduction rate satisfies

Start rolling, monitor the edge drop of the transmission side and the operating side of the incoming material and the rolled strip in real time, in the first rolling, record the edge drop of the incoming material transmission side as C _di , the edge drop of the incoming material operating side as C _wi , the edge drop of the rolled transmission side as C _do , and the edge drop of the rolled operating side as C _wo , set the final target edge drop of the transmission side as C _d , and the final target edge drop of the operating side as C _w ;

Among them, during the unwinding and winding stages, the 18-high single-stand rolling mill is in an unstable rolling state, so the value reduction at each side is collected and recorded but not included in the control; during the strip head and strip tail rolling stages, the 18-high single-stand rolling mill is in a variable speed control state, and thickness control is mainly performed at this stage, so the value reduction at this stage is collected and recorded but not included in the control;

S32, arranging pressure sensors on the support rolls on both sides of the 18-roller single-stand reversible rolling mill, including a horizontal pressure sensor and a plumb pressure sensor;

The horizontal pressure sensor is arranged at the horizontal position of the roller diameter bearing of the first layer of the side support roller system on the inlet side and the outlet side, and collects the inlet transmission side horizontal pressure value Fi-d-R, the inlet operation side horizontal pressure value Fi-c-R, the outlet transmission side horizontal pressure value Fo-d-R, and the outlet operation side horizontal pressure value Fo-c-R;

The vertical pressure sensor is arranged at the vertical position of the roller diameter bearing of the first layer of the side support roller system on the inlet side and the outlet side, and collects the inlet transmission side vertical pressure value Fi-d-H, the inlet operation side vertical pressure value Fi-c-H, the outlet transmission side vertical pressure value Fo-d-H, and the outlet operation side vertical pressure value Fo-c-H;

S33, set the same plate difference on the transmission side to C _40-D , C _30-D , C _25-D , the same plate difference on the operation side to C _40-W , C _30-W , C _25-W , the plate thickness T, the plate width W, and the same plate difference level of the hot rolling feed meets the following conditions to be qualified:

|C _xD -C _xW |≤C ₁

In the formula, x is 40, 30, 25 respectively; C ₁ is the calibration value, generally 5μm;

C ₄₀ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 40 μm from the edge of the strip, C ₃₀ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 30 μm from the edge of the strip, C ₂₅ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 25 μm from the edge of the strip, D means the transmission side, and W means the operating side;

S34, predicting the same board difference state according to the measured value;

Measure the same plate difference C _40-D , C _30-D , C _25-D on the transmission side after rolling, and the same plate difference C _40-W , C _30-W , C _25-W on the operating side;

If |C _xD -C _xW |≤C ₁ , x∈[40, 30, 25], C _x is called plate-difference symmetric;

If |C _XD -C _XW |＞C ₁ , x∈[40,30,25], C _x is called asymmetric with the same plate difference;

Specifically,

S341. If C40, C30, and C25 all meet the symmetry conditions, the plates on the operating side and the transmission side are subjected to uniform force during rolling, and the symmetry of the transverse thickness of the plates is well controlled. In subsequent regulation, all the cylinders of the left and right rollers are adjusted synchronously to improve the consistency of the roll gap on the operating side and the transmission side, and the thickness of the plates and strips on the operating side and the transmission side changes consistently after rolling.

S342, if C40, C30, and C25 all fail to meet the symmetry condition, it can be concluded that the uneven force on the operating side and the transmission side of the working roll leads to uneven force on the operating side and the transmission side during the rolling process, and the symmetry control of the transverse thickness of the plate is poor. In the subsequent regulation, it is necessary to adjust all the cylinders of the left and right side rolls respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetry condition;

S343. If some items are symmetrical and some are asymmetrical among C40, C30 and C25, first determine whether there is a problem with the detection device, so do not make any adjustments and continue to collect data; after subsequent detection, if the asymmetry disappears, follow the above steps; if the asymmetry does not disappear, the following 6 situations will occur.

a. If C40 is symmetrical, but C30 and C25 are asymmetrical, it is speculated that the rolling force deviation caused by the bending of the working rolls during the rolling process of the plate and strip causes the result of |C _40-D -C _40-W | to be very close to the critical value C1. Since C40 is closer to the middle of the plate and strip, it is least affected by this rolling force deviation and can temporarily maintain the symmetrical state of the same plate difference. Compared with C40, C30 and C25 are closer to the edge of the plate and are greatly affected by this rolling force deviation, resulting in asymmetric state of the same plate difference. In subsequent regulation, it is necessary to adjust all the cylinders of the left and right side rollers respectively and detect real-time data until C40, C30, and C25 all meet the symmetry conditions and return to the state of S341.

b. If C40 and C30 are symmetrical, and C25 is asymmetrical, the rolling force will just deviate due to the bending of the working rolls during the rolling process, which can only affect the symmetry of the same plate difference of C25 at the edge of the strip, but the same plate difference values of C30 and C25 |C _30-D -C _30-W | and |C _25-D -C _25-W | have also approached the critical value C1. In subsequent regulation, it is necessary to adjust the first oil cylinders on the left and right roller operating sides and the transmission side respectively, and detect real-time data until C40, C30, and C25 all meet the symmetry conditions and return to the state of S341.

c. If C40 and C25 are symmetrical, and C30 is asymmetrical, analysis shows that C25 near the edge of the strip and C40 near the middle of the strip are symmetrical with each other, indicating that the force on the strip is uniform in the general direction, and the asymmetry of C25 with each other is caused by the uneven force on the working roll in a small range, which is presumably caused by the uneven pressure applied by the second cylinder 9 on the operating side of the upper left roller of the side support and the second cylinder 10 on the upper left transmission side. In subsequent regulation, it is necessary to adjust the second cylinders on the operating side and transmission side of the left and right side rollers respectively, and detect real-time data until C40, C30, and C25 all meet the symmetry conditions and return to the state of S341.

d. If C25 is symmetrical, C30 and C40 are asymmetrical, analysis shows that C25 near the edge of the strip is symmetrical with the plate difference, while C30 and C40 closer to the middle are asymmetrical with the plate difference, which is caused by the uneven pressure application of the second cylinder on the side support roller operating side and the second cylinder on the transmission side. In subsequent regulation, it is necessary to adjust the second cylinders on the left and right side roller operating sides and the transmission side respectively, and detect real-time data until C40, C30, and C25 all meet the symmetry conditions and return to the state of S341.

e. If C30 and C25 are symmetrical, and C40 is asymmetrical, analysis shows that C30 and C25 near the edge of the strip are symmetrical with the same plate difference, while C40 closer to the middle is asymmetrical with the same plate difference, which is caused by the uneven pressure application of the second oil cylinder on the side support roller operating side and the second oil cylinder on the transmission side. In subsequent regulation, it is necessary to adjust the second oil cylinders on the left and right side roller operating sides and the transmission side respectively, and detect real-time data until C40, C30, and C25 all meet the symmetry conditions and return to the state of S341.

f. If C30 is symmetrical, but C40 and C25 are asymmetrical, it is considered that the rolling mill has failed. After the rolling of this coil of steel is completed, the rolling should be stopped immediately and the rolling mill should be inspected and repaired.

S35, regulating according to the detection result of S34;

The displacement of all cylinders of the side support rollers is controlled by the PID system. During the rolling process, the side support rollers are adjusted to the preset rolling position. The manual control accuracy of the cylinders on the operating table is set to L _min = 0.1mm, and the displacement of the cylinders in one adjustment is specified not to exceed L _max = 0.5mm. When the cylinder displacement is L = 0.5mm, the control is stopped and data collection is continued. After feedback that there is no data deviation, the control is continued.

Specifically,

S351. If C40, C30, and C25 all meet the symmetry conditions, it means that the left and right sides of the working roll are currently evenly stressed, so when adjusting the left and right side support cylinders, the operating side and the transmission side should be adjusted synchronously. Specifically, by pushing the second cylinder on the transmission side and the second cylinder on the operating side to move, the side support roll edge position stress increases, and then deflection occurs, forming a depression in the stress position, and the edge position is raised, which directly leads to a reduction in the pressure on the working roll edge from the side support, and an improvement in the edge roll gap. It can be judged that the rolling force on the strip edge during rolling is correspondingly reduced, and the strip edge drop problem is improved.

The displacement of the second oil cylinder each time is L ₂ =L _min . Because during the current strip rolling process, the side support roller is located at the rolling position and the same plate difference performance of the strip is good, the additional force applied to the side support roller will destroy the current rolling balance. This requires that after each adjustment of the oil cylinder, it is necessary to monitor in real time whether the edge drop value of the operating side and the transmission side of the plate after rolling is improved, and whether the same plate difference is balanced. Under the premise of ensuring the rolling balance, the oil cylinder movement is adjusted in small amounts and multiple times.

S352, if C40, C30, C25 all do not meet the symmetry condition. This means that the forces on both sides of the working roll are uneven, so asymmetric adjustment is required when adjusting the side support roll. If the same plate difference on the operating side is smaller than the same plate difference on the transmission side, that is, C _40-W ＜C _40-D . Because the position of the first oil cylinder is close to the edge and the position of the second oil cylinder is close to the middle, when the same plate difference of the three positions does not meet the symmetry condition, the adjustment of the second oil cylinder has a greater impact on the same plate difference of the three positions, so the second oil cylinder is mainly used for adjustment, and the position change of the oil cylinder satisfies L _W-2 ＝ _LD-2 ＝3L _min ; the first oil cylinder is responsible for fine-tuning, and the position change of the oil cylinder satisfies L _W-1 ＝ _LD-1 ≤2L _min .

The specific adjustment method is to first pull back the second oil cylinder on the operating side and push forward the second oil cylinder on the transmission side. Real-time monitoring of the numerical changes of C40 and C30, when C40 and C30 meet or are extremely close to the balance condition, stop adjusting the second oil cylinder, start pulling back the first oil cylinder on the operating side, and push forward the first oil cylinder on the transmission side. That is, reduce the side support force on the side with the smaller difference of the same plate, increase the side support force on the side with the larger difference of the same plate, and observe the changes of the same plate difference C40, C30, and C25 until it is adjusted to the state of S341.

S353, if C40 is symmetrical, C30 and C25 are asymmetrical. Because when the edge C25 and the middle C30 do not meet the symmetrical condition, the adjustment of the first oil cylinder has a greater impact on the same plate difference between the two, so in the adjustment process, the first oil cylinder is the main one, and the position change of the oil cylinder satisfies L _W-1 = L _D-1 = 3L _min ; the second oil cylinder is the auxiliary one, and the position change of the oil cylinder satisfies L _W-2 = L _D-2 ≤ 2L _min .

Take the case where the same plate difference on the transmission side is large, that is, C _30-D ＞C _30-W , C _25-D ＞C _25-W as an example for explanation. The specific adjustment method is to push the first oil cylinder on the transmission side and slowly pull back the first oil cylinder on the operating side. Monitor the numerical changes of C30 and C25 in real time. When C30 meets or is close to the balance condition, stop adjusting the first oil cylinder, start pulling back the second oil cylinder on the operating side, and push the second oil cylinder on the transmission side. Observe the changes of the same plate difference C40, C30, and C25 until it is adjusted to the state of S341.

S354, if C40 and C30 are symmetrical but C25 is asymmetrical, since only the edge C25 does not meet the symmetry condition, only the first oil cylinder is adjusted during the adjustment process, and the position change of the oil cylinder satisfies L _W-1 = L _D-1 ≤ 3L _min .

Take the case where the transmission side plate difference is large, i.e., C _25-D ＞C _25-W , as an example for explanation. The specific adjustment method is to push the first oil cylinder on the transmission side and pull back the first oil cylinder on the operating side. Observe the changes of the plate difference C40, C30, and C25 until it is adjusted to the state of S341.

S355, if C40 and C25 are symmetrical, but C30 is asymmetrical. Because only the middle C30 does not meet the symmetry condition, if the first cylinder is adjusted, it will have a greater impact on the already symmetrical C25; if the second cylinder is adjusted, it will have a great impact on the already balanced C40. Therefore, all cylinders need to be fine-tuned during the adjustment process, and the position change of the cylinders meets L _W-1 = L _D-1 = L _min , L _W-2 = L _D-2 = L _min . Always observe the changes in the values of C40, C30, and C25. If the conditions described in c in S343 are not met, find the same plate difference state corresponding to the current plate strip again and make adjustments.

Take the case where the transmission side plate difference is large, i.e., C _30-D ＞C _30-W, as an example for explanation. The specific adjustment method is to push the second oil cylinder on the transmission side and pull back the second oil cylinder on the operating side. Observe the changes of the plate difference C40, C30, and C25 until it is adjusted to the state of S341.

S356, if C25 is symmetrical, C30 and C40 are asymmetrical. When C40 and C30 do not meet the symmetry condition, the adjustment of the second oil cylinder has a greater impact on the same plate difference between the two, so the second oil cylinder is the main one in the adjustment process, and the position change of the oil cylinder satisfies L _W-1 = L _D-1 = 3L _min ; the first oil cylinder is the auxiliary one, and the position change of the oil cylinder satisfies L _W-2 = L _D-2 ≤ 2L _min .

Take the case where the same plate difference on the transmission side is large, i.e., C _30-D ＞C _30-W , C _40-D ＞C _40-W as an example for explanation. The specific adjustment method is to push the second oil cylinder on the transmission side and pull back the second oil cylinder on the operating side. Real-time monitoring of the numerical changes of C40 and C30, when C40 meets or is close to the balance condition, stop adjusting the second oil cylinder, start pulling back the first oil cylinder on the operating side, and push the first oil cylinder on the transmission side. Observe the changes of the same plate difference C40, C30, and C25 until it is adjusted to the state of S341.

S357, if C30 and C25 are symmetrical but C40 is asymmetrical, since only the edge C40 does not meet the symmetry condition, only the second oil cylinder is adjusted during the adjustment process, and the position change of the oil cylinder satisfies L _W-1 = _{LD-1 ≤3Lmin} .

Take the case where the transmission side plate difference is large, i.e., C _25-D ＞C _25-W , as an example for explanation. The specific adjustment method is to push the second oil cylinder on the transmission side and pull back the second oil cylinder on the operating side. Observe the changes of the plate difference C40, C30, and C25 until it is adjusted to the state of S341.

S358: If C30 is symmetrical, but C40 and C25 are asymmetrical, it is assumed to be a mill failure, and the machine should be stopped immediately for maintenance after the current strip is rolled.

S36, check and record again the horizontal displacement _Xw of the working roll operating side, the horizontal displacement _Xd of the working roll driving side, the vertical displacement _Yw of the working roll operating side and the vertical displacement _Yd of the working roll driving side; assume that the rightward displacement and the upward displacement are the positive direction; the stability condition is:

|X _W |≤ΔX,|X _D |≤ΔX,|Y _W |＝|Y _D |≤ΔY

Ensure that the working rolls meet stable conditions;

Specifically,

a. If |X _W |≥ΔX, |X _D |≥ΔX, |Y _W |＝|Y _D |≤ΔY, it means that the working roll has transversely shifted again during the rolling process. Assuming X _W >0, X _D <0, the operating side of the working roll deviates to the right and the transmission side deviates to the left. At this time, it is necessary to slowly push the first cylinder on the upper right operating side and slowly pull back the first cylinder on the upper left operating side 8; slowly push the first cylinder on the upper left transmission side 11 and slowly pull back the first cylinder on the upper right transmission side. Continue to adjust until the displacement sensor value meets the stable condition.

b. If |X _W |≥ΔX, |X _D |≥ΔX, |Y _W |＝|Y _D |≥ΔY, it means that the working roll has eccentric displacement during the rolling process. According to the method described above, calculate the eccentric angle α. If the working roll deviates to the right, adjust the pressing angle of the right support roll to be consistent with α, and slowly push forward the first cylinder on the upper right operating side and the first cylinder on the transmission side. Continue to adjust until the displacement sensor value meets the stability condition.

c. If |X _W |≤ΔX,|X _D |≤ΔX,|Y _W |＝|Y _D |≤ΔY and the stability condition is met, then continue to maintain.

S37, re-inspect and record the reduction value C _do of the transmission side after rolling and the reduction value C _wo of the operating side after rolling;

The target values of the operating side and the transmission side of each pass are expressed by the following formula:

(C _w -C _wi )*Nx,x∈(1,n)--operation side

(C _d -C _di )*Nx,x∈(1,n)--Transmission side

Wherein, _Cw represents the target edge drop value after rolling on the operating side, _Cwi represents the edge drop value before rolling on the operating side, _Cd represents the target edge drop value after rolling on the operating side, _Cdi represents the edge drop value before rolling on the operating side, and _NX represents the reduction rate of the xth pass.

The above steps are executed repeatedly. When the detected edge drop value satisfies the following two formulas at the same time, the edge drop value detection of this pass is considered to meet the standard:

_Cwo≤ ( _Cw - _Cwi )*Nx

C _do ≤(C _d -C _di )*Nx.

If the edge drop of the detected strip meets the standard, it will be maintained until the next pass begins.

If the edge drop of the detected plate strip does not meet the standard, the control is cyclically performed until the conditions described in S36-C are met.

The above-mentioned cylinders are arranged as follows:

In the actual design, the total length of the side support roller is 1634 mm.

The diameter of the first oil cylinder on the operating side is 200mm, its center line is perpendicular to the center line of the side support roller, and is 232-235mm away from the operating side edge of the side support roller;

The diameter of the second oil cylinder on the operating side is 100 mm, its center line is perpendicular to the center line of the side support roller, and is 432 to 435 mm away from the operating side edge of the side support roller;

The diameter of the first oil cylinder on the transmission side is 200mm, its center line is perpendicular to the center line of the side support roller, and is 232-235mm away from the transmission side edge of the side support roller;

The diameter of the second oil cylinder on the transmission side is 100 mm, and its center line is perpendicular to the center line of the side support roller, and is 432 to 435 mm away from the transmission side edge of the side support roller.

The side support rollers are arranged symmetrically on the left and right sides.

As shown in Figures 3 and 4, in the present invention, each displacement sensor group adopts a configuration form of a group of two detection elements, and the two detection elements are respectively located at the end position of the operating side and the end position of the transmission side; the detection element at each side support position is composed of two displacement sensors, including a side support horizontal displacement sensor 4-2 and a side support vertical displacement sensor 4-1; the detection elements of the upper working roll and the lower working roll are composed of four displacement sensors, which are respectively arranged in the horizontal direction and the vertical direction of the roll diameter on the transmission side and the operating side of the working roll, and the spatial position of the working roll can be obtained in real time according to the average of the actual measured data.

Each pressure sensor group adopts a configuration of a group of two detection elements, and the two detection elements are respectively located on the lower side of the side support hydraulic cylinder on the operating side and the transmission side; the detection element at each position is composed of two pressure sensors, including a side support horizontal pressure sensor 4-4 and a side support vertical pressure sensor 4-3.

This will be described below with reference to specific embodiments.

The specific implementation process is as follows:

Step 1: Before rolling, the 18-high rolling mill is pressed down to a zero roll gap state, and sensors at all levels are cleared;

Step 2: Execute rolling, and collect the horizontal displacement signals of sensors No. 1 and No. 2 on the upper working roll transmission side: I _UDX-1 = 8.137 μm, I _UDX-2 = 8.265 μm, the horizontal displacement signals of the horizontal displacement sensors 1-4-7 and 2-4-8 on the upper working roll operating side: I _UWX-1 = -4.237 μm, I _UWX-2 = -4.094 μm, the vertical displacement signals of sensors No. 1 and No. 2 on the upper working roll transmission side: I _UDY-1 = 6.233 μm, I _UDY-1 = 6.215 μm, the vertical displacement signals of the vertical displacement sensors 1-4-5 and 2-4-6 on the upper working roll operating side: I _UWY-1 = 6.232 μm, I _UWY-2 = 6.216 μm; the horizontal displacement signals of sensors No. 1 and No. 2 on the lower working roll transmission side: I _DDX-1 ＝8.288μm, I _DDX-2 ＝8.314μm, horizontal displacement signal of No. 1 and 2 sensors on the operating side of the lower working roll I _DWX-1 ＝-4.328μm, I _DWX-2 ＝-4.289μm, vertical displacement signal of No. 1 and 2 sensors on the transmission side of the lower working roll I _DDY-1 ＝6.012μm, I _DDX-2 ＝6.157μm, vertical displacement signal of No. 1 and 2 sensors on the operating side of the lower working roll I _DWY-1 ＝6.031μm, I _DWX-2 ＝6.096μm, and signal analysis is performed.

Step 2-1: Calculate the eccentricity of the transmission side and the operating side of the upper working roll and the lower working roll.

Take the above working roll as an example:

Two sensors are arranged on each side, and the horizontal displacement and vertical displacement of the working roll are represented by the average value of the two signals:

According to the above formula, the horizontal displacement of the working roll transmission side can be obtained:

Horizontal displacement of upper working roll operating side:

Vertical displacement of upper working roll driving side:

Vertical displacement of upper working roll operating side:

Take point A on the transmission side of the work roll, point B on the operating side of the work roll, and point C on the axis of the operating side of the work roll. The movement of the work roll is divided into two parts, one is the horizontal rotation displacement of the work roll, and the other is the eccentric displacement of the work roll. Assume that the displacement direction of the sensor is to the right as the positive direction.

When the working roll makes horizontal rotation displacement, the vertical displacement is 0, that is, y _A-A' = 0, y _B-B' = 0, x _A-A' = x ₁ , x _B-B' = -x ₁ ,

When the working roll makes eccentric motion, x _C-C' = x ₂ , y _C-C' = I _UWY

So the sensor finally measures I _UWX = x ₂ - x ₁ , I _UDX = x ₂ + x ₁ ,

We can get:

The same applies to the lower working roll.

Step 3: Based on the data measured in step 2:

I _UWX = -4.166 μm, I _UDX = 8.201 μm, I _UWY = 6.224 μm, I _UDY = 6.224 μm

It can be seen that the working roll is offset to the upper right as a whole, and the working roll is adjusted back.

The specific adjustment is as follows: first adjust the angle of the upper right support roller to 72°, then simultaneously advance the first oil cylinder on the upper right transmission side and the operating side by 0.3mm, and detect:

I _UWX = -1.633 μm, I _UDX = 1.286 μm, I _UWY = 1.241 μm, I _UDY = 1.242 μm

Use the second oil cylinder on the upper right transmission side and the operating side to fine-tune the position of the working roll, push the second oil cylinder on the upper right transmission side and the operating side forward 0.1mm, and detect:

I _UWX = -0.023μm, I _UDX = 0.202μm, I _UWY = 0.023μm, I _UDY = 0.023μm

The working roll offset is detected to meet the following conditions:

|I _UWX |≤2μm,|I _UDX |≤2μm,|I _UWY |＝|I _UDY |≤2μm

The working roll callback is successful.

Further, edge drop adjustment is performed, and the specific steps are as follows:

Step 1: Before rolling begins, set the steel coil A to be rolled 6 times, the target rolling side reduction _Cod = _Cow = 20μm, the first pass reduction rate N1 = 50%, and each subsequent pass reduction rate is 10%. Start rolling, monitor the driving side/operating side reduction of the incoming material and the rolled plate and strip in real time, record the incoming material driving side reduction _Cid = 26μm, the incoming material operating side reduction _Ciw = 24μm, the rolling driving side reduction _Cod = 34μm, and the rolling operating side reduction _Cow = 36μm;

Step 1-1: During the unwinding and winding stages, the 18-high single-stand rolling mill is in an unstable rolling state, so the value reduction on each side is collected and recorded but not included in the control;

Step 1-2: During the strip head and strip tail rolling stage, the 18-high single-stand rolling mill is in a variable speed control state. This stage mainly performs thickness control, so the edge drop value is collected and recorded but not included in the control;

Step 2: Pressure sensors are arranged on the roller systems of the support rollers on both sides of the 18-roller single-stand reversible rolling mill, including horizontal pressure sensors and vertical pressure sensors. The horizontal pressure sensors are arranged at the horizontal position of the roller diameter bearing of the first layer of the side support roller system on the inlet side and the outlet side, and the horizontal pressure values of 30.124t on the inlet transmission side, 30.131t on the inlet operation side, 30.123t on the outlet transmission side, and 30.126t on the outlet operation side are collected; the vertical pressure sensors are arranged at the vertical position of the roller diameter bearing of the first layer of the side support roller system on the inlet side and the outlet side, and the vertical pressure values of 40.033t on the inlet transmission side, 40.071t on the inlet operation side, 40.029t on the outlet transmission side, and 40.063t on the outlet operation side are collected.

Step 3: The measured plate difference on the transmission side is C _40-D = 23μm, C _30-D = 37μm, C _25-D = 46μm, the plate difference on the operation side is C _40-W = 25μm, C _30-W = 33μm, C _25-W = 43μm, the plate thickness T = 0.8mm, the plate width W = 1500mm, and the plate difference level of the hot rolling feed meets the following conditions to be qualified:

|C _xD -C _xW |≤5

From the above data, we can get:

|C _40-D -C _40-W |＝|23-25|＝2≤5

|C _30-D -C _30-W |＝|37-33|＝4≤5

|C _25-D -C _25-W |＝|43-46|＝3≤5

Step 4: According to the above calculation results, C40, C30, and C25 all meet the symmetry conditions, and the operating side and the transmission side are symmetrical with each other.

Step 5: Based on the test results of step 4, make adjustments:

At present, the left and right sides of the working roll are evenly stressed, so when adjusting the left and right side support cylinders, the operating side and the transmission side should be adjusted synchronously. Specifically, by pushing the second cylinder on the transmission side and the second cylinder on the operating side to move, the side support roll edge position is stressed, which then bends, forming a depression in the stress position and an effect of raising the edge position, which directly leads to a reduction in the pressure on the working roll edge from the side support and an improvement in the edge roll gap. It can be judged that the rolling force on the strip edge during rolling is correspondingly reduced, and the strip edge drop problem is improved.

Each displacement of the second oil cylinder is L ₂ =L _min =0.1mm. Because the side support roller is in the rolling position and the same plate difference performance of the plate and strip is good during the current plate and strip rolling process, the additional force applied to the side support roller will destroy the current rolling balance. This requires us to monitor in real time whether the edge drop value of the operating side and the transmission side of the plate after rolling is improved after each adjustment of the oil cylinder. The first pass reduction rate is 50%, and it is required that after the first pass rolling is completed, the edge drop value of the transmission side after rolling is C _od ≤28μm, and the edge drop value of the operating side after rolling is C _ow ≤28μm; according to the feedback of the field data, when the second oil cylinder displacement L ₂ =0.2mm, the edge drop value of the transmission side after rolling is C _od =32μm, which is a decrease of 2μm; the edge drop value of the operating side after rolling is C _ow =35μm, which is a decrease of 1μm. Continue to push the second oil cylinder forward, when _L2 = 0.6mm, the post-rolling transmission side edge drop value C _od = 27μm, a decrease of 8μm; the post-rolling operating side edge drop value C _ow = 28μm, a decrease of 8μm. When the target edge drop value of the first pass is reached, stop the regulation, but continue to detect and count the values of various indicators.

Step 6: Check and record again the horizontal displacement signals of sensors No. 1 and No. 2 on the upper working roll transmission side: I _UDX-1 = 0.203 μm, I _UDX-2 = 0.184 μm, the horizontal displacement signals of sensors No. 1 and No. 2 on the upper working roll operating side: I _UWX-1 = -0.465 μm, I _UWX-2 = -0.494 μm, the vertical displacement signals of sensors No. 1 and No. 2 on the upper working roll transmission side: I _UDY-1 = 0.383 μm, I _UDY-1 = 0.379 μm, the vertical displacement signals of sensors No. 1 and No. 2 on the upper working roll operating side: I _UWY-1 = 0.381 μm, I _UWY-2 = 0.382 μm; the horizontal displacement signals of sensors No. 1 and No. 2 on the lower working roll transmission side: I _DDX-1 = 0.162 μm, I _DDX-2 =0.193μm, the horizontal displacement signal of No. 1 and No. 2 sensors on the operating side of the lower working roll is _IDWX-1 =0.172μm, _IDWX-2 =0.182μm, the vertical displacement signal of No. 1 and No. 2 sensors on the transmission side of the lower working roll is I _DDY-1 =0.032μm, I _DDY-2 =0.036μm, the vertical displacement signal of No. 1 and No. 2 sensors on the operating side of the lower working roll is _IDWY-1 =0.031μm, _IDWX-2 =0.034μm, and signal analysis is performed.

Assume the working roll stability condition is:

|X _W |≤2μm,|X _D |≤2μm,|Y _W |＝|Y _D |≤2μm

According to the measured data, determine whether the working roll is in a stable state:

Take the above working roll as an example:

The horizontal displacement data of the working roll transmission side can be calculated:

The horizontal displacement data of the working roll operating side can be calculated:

The vertical displacement data of the working roll transmission side can be calculated:

The vertical displacement data of the working roll operating side can be calculated:

The working roll can be stabilized and does not need to be adjusted again.

Step 7: Check and record the edge drop value of the operating side after rolling again. C _wo = 28 μm, and the edge drop value of the transmission side after rolling is C _do = 27 μm. The target edge drop values of the operating side and the transmission side of each pass are expressed by the following formula:

The first pass side drop target value:

C _1-w =C _w -(C _w -C _wi )*Nx=34-(34-20)*50%=28μm

Target value of side drop in the first transmission:

C _1-d =C _d -(C _d -C _di )*Nx=36-(36-20)*50%=28μm

Because the current side edge reduction after rolling is C _wo = 28 μm ≤ C _1-w = 28 μm, and the side edge reduction after rolling is C _do = 27 μm ≤ C _1-d = 28 μm, both meet the target side reduction value of the first pass. Continue to maintain this control state until the next pass.

Step 8: The above steps are repeated until the rolling of the steel coil is completed.

The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims (7)

1. A method for controlling the side support force of an 18-high rolling mill based on edge drop control, characterized in that it comprises the following steps: S1. Arrange an 18-high rolling mill platform with side support force-position measurement and control functions; specifically, The platform includes a rolling mill main body device and a detection device; The main device of the rolling mill includes a left coiler, a left guide roller, an 18-roller rolling mill, a right guide roller, and a right coiler; The detection device includes a left convexity meter, a right convexity meter, a displacement sensor group and a pressure sensor group; The displacement sensor group includes a left upper support roller system displacement sensor group, a right upper support roller system displacement sensor group, a left lower support roller system displacement sensor group, a right lower support roller system displacement sensor group, an upper working roller displacement sensor group and a lower working roller displacement sensor group; The pressure sensor group includes a left upper support roller pressure sensor group, a right upper support roller pressure sensor group, a left lower support roller pressure sensor group, and a right lower support roller pressure sensor group; The left side convexity meter is arranged between the left guide roller and the 18-roller rolling mill; The right side convexity meter is arranged between the right guide roller and the 18-roller rolling mill; S2, performing displacement calibration of working roll eccentricity detection and callback; specifically, the steps include the following: S21, before starting rolling, the 18-high rolling mill is pressed down to a zero roll gap state, and sensors at all levels are cleared; S22, executing rolling, and collecting horizontal displacement signals I _UDX-1 and I _UDX-2 of two displacement sensors on the driving side of the upper working roll, horizontal displacement signals I _UWX-1 and I _UWX-2 of two displacement sensors on the operating side of the upper working roll, vertical displacement signals I _UDY-1 and I _UDY-2 of two displacement sensors on the driving side of the upper working roll, vertical displacement signals I _UWY-1 and I UWY _{-2 of two displacement sensors on the operating side of the upper working roll; horizontal displacement signals I DDX-1 and I DDX-2 of two displacement sensors on the driving side of the lower working roll, horizontal displacement signals I DWX-1 and I DWX -2} of two displacement sensors on the operating side of the lower working roll, vertical displacement signals I DDY _{- 1} and I _{DDY -2} of two displacement sensors on the driving side of the lower working roll, vertical displacement signals I _{DWY-1 and} I _DWY- 2 of two displacement sensors on the operating side of the lower working roll, and performing signal analysis; S23, adjusting the working roll according to the displacements _XW and _YW and the eccentric angle α obtained by the analysis in S2; Assume the working roll stability condition: |X _W |≤ΔX,|X _D |≤ΔX,|Y _W |＝|Y _D |≤ΔY Among them, ΔX is the calibration value, which is 2μm; ΔY is the calibration value, which is 2μm; Use the first oil cylinder on the transmission side and the first oil cylinder on the operating side of the left support roller and the right support roller to control the movement of the oil cylinder in the corresponding direction, and always observe the value of the displacement sensor of the working roller. When the measured value meets the working roller stability condition, the callback is successful; S3, performing force control of the side support roller system; specifically, the steps include the following: S31. Before rolling begins, set the steel coil A to be rolled n times, the first rolling reduction rate is N1, the second rolling reduction rate is N2, and the rolling reduction rate of the nth rolling reduction rate is Nn; And, the reduction rate satisfies

Start rolling, monitor the edge drop of the transmission side and the operating side of the incoming material and the rolled strip in real time, in the first rolling, record the edge drop of the incoming material transmission side as C _di , the edge drop of the incoming material operating side as C _wi , the edge drop of the rolled transmission side as C _do , and the edge drop of the rolled operating side as C _wo , set the final target edge drop of the transmission side as C _d , and the final target edge drop of the operating side as C _w ; S32, arranging pressure sensors on the support rolls on both sides of the 18-roller single-stand reversible rolling mill, including a horizontal pressure sensor and a plumb pressure sensor; The horizontal pressure sensor is arranged at the horizontal position of the roller diameter bearing of the first layer of the side support roller system on the inlet side and the outlet side, and collects the inlet transmission side horizontal pressure value Fi-d-R, the inlet operation side horizontal pressure value Fi-c-R, the outlet transmission side horizontal pressure value Fo-d-R, and the outlet operation side horizontal pressure value Fo-c-R; The vertical pressure sensor is arranged at the vertical position of the roller diameter bearing of the first layer of the side support rollers on the inlet and outlet sides, and collects the inlet transmission side vertical pressure value Fi-d-H, the inlet operation side vertical pressure value Fi-c-H, the outlet transmission side vertical pressure value Fo-d-H, and the outlet operation side vertical pressure value Fo-c-H; S33, set the same plate difference on the transmission side to C _40-D , C _30-D , C _25-D , and the same plate difference on the operation side to C _40-W , C _30-W , C _25-W . The same plate difference level of the hot rolling feed meets the following conditions to be qualified: |C _xD -C _xW |≤C ₁ In the formula, x is 40, 30, and 25 respectively; C ₄₀ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 40 μm from the edge of the strip, C ₃₀ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 30 μm from the edge of the strip, C ₂₅ means the value obtained by subtracting the thickness at the center of the strip from the thickness at 25 μm from the edge of the strip, D means the transmission side, and W means the operating side; C ₁ is the calibration value, which is 5 μm; S34, predicting the same board difference state according to the measured value; Measure the same plate difference C _40-D , C _30-D , C _25-D on the transmission side after rolling, and the same plate difference C _40-W , C _30-W , C _25-W on the operating side; If |C _xD -C _xW |≤C ₁ , x∈[40, 30, 25], C _x is called plate-difference symmetric; If |C _XD -C _XW |＞C ₁ , x∈[40,30,25], C _x is called asymmetric with the same plate difference; S35, regulating according to the detection result of S34; The displacement of all cylinders of the side support rollers is controlled by the PID system. During the rolling process, the side support rollers are adjusted to the preset rolling position. The manual control accuracy of the cylinders on the operating table is set to L _min = 0.1mm, and the displacement of the cylinders in one adjustment is specified not to exceed L _max = 0.5mm. When the cylinder displacement is L = 0.5mm, the control is stopped and data collection is continued. After feedback that there is no data deviation, the control is continued. S36, check and record again the horizontal displacement _Xw of the working roll operating side, the horizontal displacement _Xd of the working roll driving side, the vertical displacement _Yw of the working roll operating side and the vertical displacement _Yd of the working roll driving side; assume that the rightward displacement and the upward displacement are the positive direction; the stability condition is: |X _W |≤ΔX,|X _D |≤ΔX,|Y _W |＝|Y _D |≤ΔY Ensure that the working rolls meet stable conditions; S37, check and record the transmission side edge drop value C _do and the operation side edge drop value C _wo after rolling again; when the detected edge drop values satisfy the following two formulas at the same time, the edge drop value detection of this pass is considered to meet the standard: _Cwo≤ ( _Cw - _Cwi )*Nx C _do ≤(C _d -C _di )*Nx Wherein, Nx is the reduction rate of the Xth pass. 2. According to the side support force control method of the eighteen-roll rolling mill based on edge drop control described in claim 1, it is characterized in that each displacement sensor group in S1 adopts a configuration form of a group of two detection elements, and the two detection elements are respectively located at the end position of the operating side and the end position of the transmission side; the detection element of each side support position is composed of two displacement sensors, including a side support horizontal displacement sensor and a side support vertical displacement sensor; the detection elements of the upper working roll and the lower working roll are composed of four displacement sensors, which are respectively arranged in the horizontal direction and vertical direction of the roll diameter on the transmission side and the operating side of the working roll. 3. According to the side support force control method of the eighteen-roll rolling mill based on edge drop control in claim 1, it is characterized in that each pressure sensor group in S1 adopts a configuration form of a group of two detection elements, and the two detection elements are respectively located at the lower side of the side support hydraulic cylinder on the operating side and the transmission side; the detection element at each position is composed of two pressure sensors, including a side support horizontal pressure sensor and a side support vertical pressure sensor. 4. The method for controlling the side support force of an 18-high rolling mill based on edge drop control according to claim 1, characterized in that the signal analysis in S22 is specifically as follows: S221, calculating the eccentricity of the transmission side and the operating side of the upper working roll and the lower working roll; Two sensors are arranged on each side of the working roll to measure the horizontal displacement of the working roll.

and vertical displacement

Expressed as the mean of the two sensor signals:

Among them, x ₁ and x ₂ are the horizontal displacement signals of the two displacement sensors on each side of the working roll, and y ₁ and y ₂ are the vertical displacement signals of the two displacement sensors on each side of the working roll; S222. Calculate the eccentricity angle α:

Among them: _XW is the horizontal displacement of the working roll operating side, _XD is the horizontal displacement of the working roll driving side, and _YW is the vertical displacement of the working roll operating side. 5. The side support force control method of an 18-high rolling mill based on edge drop control according to claim 1 is characterized in that, in the S31, in the uncoiling and winding stages and the strip head and strip tail rolling stages, each edge drop value is collected and recorded but not included in the control. 6. The method for controlling the side support force of an 18-high rolling mill based on edge drop control according to claim 1, characterized in that the prediction process in S34 is specifically as follows: S341. If C40, C30, and C25 are all symmetrical with the same plate difference, the plates on the operating side and the transmission side are evenly stressed during rolling, the transverse thickness symmetry of the plates is well controlled, and the thickness of the plates and strips on the operating side and the transmission side changes consistently after rolling; S342, if C40, C30, C25 are all asymmetric with the same plate difference, the uneven force on the operating side and the transmission side of the working roll leads to uneven force on the plates on the operating side and the transmission side during rolling, and the symmetry of the transverse thickness of the plate is poorly controlled. In the subsequent regulation, all the cylinders of the left and right side rolls are adjusted respectively, and the real-time data is detected until C40, C30, C25 are all symmetric with the same plate difference; S343: If there is at least one symmetric same plate difference and at least one asymmetric same plate difference among C40, C30 and C25, continue to collect data. If the asymmetric same plate difference disappears, proceed according to step S341. If the symmetric same plate difference disappears, proceed according to step S342. If there is still at least one symmetric same plate difference and at least one asymmetric same plate difference, then: a. If the C40 plate difference is symmetrical, and the C30 and C25 plate differences are asymmetrical, in the subsequent regulation, it is necessary to adjust all the cylinders of the left and right rollers respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetrical conditions; b. If the C40 and C30 have symmetric plate differences, but the C25 has asymmetric plate differences, in subsequent regulation, it is necessary to adjust the first oil cylinders on the left and right roller operating sides and the transmission side respectively, and detect real-time data until C40, C30, and C25 all meet the symmetry conditions; c. If the C40 and C25 have symmetrical plate differences, but the C30 has asymmetrical plate differences, in subsequent regulation, it is necessary to adjust the second oil cylinders on the operating side and the transmission side of the left and right rollers respectively, and detect real-time data until C40, C30, and C25 all meet the symmetrical conditions; d. If the C25 plate difference is symmetrical, and the C30 and C40 plate differences are asymmetrical, in the subsequent regulation, it is necessary to adjust the second oil cylinders on the left and right roller operating sides and the transmission side respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetrical conditions; e. If the C30 and C25 have symmetrical plate differences, but the C40 has asymmetrical plate differences, in the subsequent regulation, it is necessary to adjust the second oil cylinders on the operating side and the transmission side of the left and right rollers respectively, and detect the real-time data until C40, C30, and C25 all meet the symmetrical conditions; f. If the C30 plate difference is symmetrical, and the C40 and C25 plate differences are asymmetrical, it is considered that the rolling mill has a fault. After the rolling of this coil of steel is completed, the rolling should be stopped immediately and the rolling mill should be inspected and repaired. 7. The method for controlling the side support force of an 18-high rolling mill based on edge drop control according to claim 1, characterized in that the step S36 specifically comprises: S361. If |X _W |≥ΔX, |X _D |≥ΔX, |Y _W |＝|Y _D |≤ΔY, it means that the working roll is laterally offset again during the rolling process, and the first cylinder on the upper right operating side, the first cylinder on the upper left operating side, the first cylinder on the upper left transmission side, and the first cylinder on the upper right transmission side are pushed and adjusted until the displacement sensor value meets the stability condition; S362. If |X _W |≥ΔX, |X _D |≥ΔX, |Y _W |＝|Y _D |≥ΔY, it means that the working roll has eccentric displacement during the rolling process, and the eccentric angle α is calculated. If the working roll deviates to the right, the pressing angle of the right support roll is adjusted to be consistent with α, and the first oil cylinder on the upper right operating side and the first oil cylinder on the upper right transmission side are slowly pushed forward, and the adjustment is continued until the displacement sensor value meets the stability condition; S363. If |X _W |≤ΔX, |X _D |≤ΔX, |Y _W |＝|Y _D |≤ΔY, and the stability condition is met, then continue to maintain.

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