CN116020882A - Control method for leveling coiling pinch roll according to tail center line deviation of finishing mill - Google Patents
Control method for leveling coiling pinch roll according to tail center line deviation of finishing mill Download PDFInfo
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- CN116020882A CN116020882A CN202211194834.1A CN202211194834A CN116020882A CN 116020882 A CN116020882 A CN 116020882A CN 202211194834 A CN202211194834 A CN 202211194834A CN 116020882 A CN116020882 A CN 116020882A
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Abstract
The invention relates to a control method of a hot rolling coiling machine, in particular to a control method for leveling a coiling pinch roll according to the tail central line deviation of a finishing mill, which is characterized in that the pressure or roll gap leveling quantity of the pinch roll is calculated according to the finish rolling tail central line deviation judgment result and by combining the thickness, the width and the hardness of strip steel, the pressure or the roll gap of a pinch roll on a working side is automatically compensated by a program on the basis of original control, and the pressure or the roll gap of the pinch roll on the working side is increased or reduced, so that the automatic leveling function of the tail part of the pinch roll is realized.
Description
Technical Field
The invention relates to a control method of a hot rolling coiling machine, in particular to a control method for leveling a coiling pinch roll according to the tail central line deviation of a finishing mill.
Background
Along with the improvement of industrial technology, the coiling machine is used for coiling rolled finished products into coils so as to adapt to the requirements of production, transportation, storage and users, the coiling machine has large tension so as to ensure that the rolling pressure is reduced and the strip steel warping phenomenon is reduced, so that the quality of strip steel products is improved, a core equipment reel, an auxiliary coiling equipment auxiliary coiling roller and the like are generally formed, the products are mainly formed on the reel in the coiling process of the products, the reel is generally dragged by a motor, the auxiliary coiling equipment auxiliary coiling roller is generally dragged by the motor to rotate, and the fluid hydraulic cylinder drives the auxiliary coiling roller to move so as to help smooth coiling.
At present, coiling of a coiling machine is used as the last procedure of a hot rolling main line, coiling is an important control index of the area, the most and most difficult control of poor coiling is that the tail of a steel coil overflows, the tail overflow is generated due to deviation of the steel strip, a side guide plate is forcedly corrected to form an arc-shaped path, the steel strip does not return to a central line in the rolling process, after the tail of the steel strip is out of tension, the correction effect of the side guide plate disappears, the relation between the tail overflow and the camber degree of the tail of the steel strip after finish rolling and throwing is larger, and the rolling force imbalance at two sides of the finish rolling is the cause of the deviation of the steel strip.
After finish rolling and steel casting, when the strip steel tail is seriously bent, the strip steel tends to deviate to one side, the side guide plate deviation correcting process and the strip steel edge extrusion generate larger pressure, when the guide plate pressure is larger than the set pressure, the side guide plate is gradually opened, so that the strip steel tail is severely overflowed in a plurality of circles, meanwhile, in the finish rolling and steel casting process, if the side guide plate can play a role in deviation correcting, the strip steel does not outwards deviate layer by layer, but when the side guide plate moves to the tail with a short stroke, the side guide plate is opened according to the set opening degree, but due to the strip steel tail bending influence, the strip steel tail is extruded to one side, and the outer 1-2 circles of severely overflowed edges are generated
By analyzing the occurrence rate of the corresponding edge overflow of the center line deviation amount (the detection range is-200 mm to 200 mm) of the different finish rolling tail parts, the occurrence rate of the edge overflow defect gradually rises as the center line deviation amount of the finish rolling tail parts increases, and when the center line deviation amount of the finish rolling tail parts is larger than 60mm, the occurrence rate of the edge overflow defect increases more obviously, and specific data are shown in the following table 1.
TABLE 1 correspondence of finish tail centerline offset to edge overflow defects
| Finish rolling tail center line deviation absolute value/mm | Average value/mm of finish rolling tail center line deviation absolute value | Edge overflow blocking volume number/block | Production of total volume/block | Incidence of edge spill |
| 0-20 | 15 | 8 | 5406 | 0.15% |
| 20-40 | 31 | 22 | 13028 | 0.17% |
| 40-60 | 50 | 52 | 7436 | 0.70% |
| 60-80 | 70 | 58 | 1894 | 3.06% |
| 80-100 | 88 | 52 | 811 | 6.41% |
| 100-120 | 111 | 43 | 321 | 13.40% |
| 120-140 | 130 | 28 | 134 | 20.90% |
| 140-160 | 154 | 21 | 50 | 42.00% |
| 160-180 | 161 | 12 | 21 | 57.14% |
| 180-200 | 186 | 8 | 12 | 66.67% |
At present, two control modes are adopted for the pinch roll, one is pressure control (control is carried out according to single-side target pressure), the other is position control (control is carried out according to total target pressure), the two control modes can be selected by themselves and are mutually switched, when the camber of the tail part of the strip steel is larger after finish rolling and throwing, if the pinch roll adopts pressure control, an operator adjusts the set pressure of the working side, if the pinch roll adopts position control, the operator adjusts the roll gap of the working side, thereby correcting the deviation phenomenon of the tail part of the strip steel, achieving the purpose of improving roll shape control, and after strip steel coiling is completed, canceling the set pressure or the roll gap adjusted by the part of the pinch roll, the method has a certain improvement effect on roll shape control, but increasing the load of the operator.
The invention aims to provide a control method for leveling a coiling pinch roll according to the tail central line deviation of a finishing mill.
Disclosure of Invention
In order to achieve the above purpose, the invention provides a control method for leveling a coiling pinch roll according to the tail center line deviation of a finishing mill, wherein the strip steel coiling process of a steel coiling system consists of a finish rolling working roll, a layer cooling roll table, rolled strip steel, a finish rolling center line deviation detection device, a side guide plate, an upper pinch roll, a lower pinch roll, a coil assisting roll and a winding drum, the head of the strip steel is conveyed to the side guide plate through the layer cooling roll table after being rolled by the finish rolling working roll, a laminar cooling device is arranged at the upper part of the layer cooling roll table, the rolled strip steel is bent and guided by the upper pinch roll and the lower pinch roll, and is operated to the winding drum to coil the strip steel, and the coil assisting roll assists the winding drum to coil the strip steel.
After the finish rolling end frame throws steel, the finish rolling tail center line deviation is detected by a finish rolling center line deviation detecting device, the average value of the finish rolling center line deviation within 200ms after F1 throws steel is taken as P1, the average value P2 of the finish rolling center line deviation within 200ms before the finish rolling outlet finish rolling center line deviation detecting device is turned OFF (OFF), and the P2 is subtracted by P1 to obtain the finish rolling tail center line deviation, so that the finish rolling tail center line deviation Pt is determined.
The pinch roll pressure leveling quantity DeltaFor is calculated by combining the finish rolling tail center line deviation quantity Pt, the strip steel width W, the strip steel thickness H, the strip steel hardness group hard and the like PR Or the roll Gap leveling quantity delta Gap of the pinch roll PR 。
If the pinch adopts a pressure control mode, the pressure leveling quantity of the pinch roll according to the central line difference of the finish rolling tail part is as follows:
wherein:
△For PR -pinch roll pressure leveling calculation (KN);
pt—finish rolling tail center line offset deflection (mm);
w-rolling target width (mm) of strip steel;
h, rolling target thickness (mm) of strip steel;
hard-hardness group of strip steel.
Wherein, pt is positive value and represents the actual deflection working side of the strip steel, pt is negative value and represents the actual deflection driving side of the strip steel, and the pinch roll pressure leveling quantity DeltaFor PR The positive value indicates that the set pressure on the working side (pressure working side) is increased, and the pinch roll pressure is regulated by the pressure regulating amount DeltaFor PR A negative value indicates a decrease in the working side set pressure (lifting of the working side).
If the pinch adopts a position control mode, the roll gap leveling amount of the pinch roll according to the center line deviation amount of the finish rolling tail part is as follows:
wherein:
△Gap PR -pinch roll gap leveling calculation (mm);
pt—finish rolling tail center line offset deflection (mm);
w-rolling target width (mm) of strip steel;
h, rolling target thickness (mm) of strip steel;
hard-hardness group of strip steel.
Wherein, pt is positive value and represents the actual deflection working side of the strip steel, pt is negative value and represents the actual deflection driving side of the strip steel, and the roll Gap leveling quantity delta Gap of the pinch roll PR The positive value indicates that the roll gap of the working side is increased (the working side is lifted), and the pressure of the pinch roll is regulated by the pressure regulating quantity DeltaFor PR Negative values indicate a decrease in the working side roll gap (pressure working side).
According to the determined pinch roll pressure leveling quantity DeltaFor PR Or the roll Gap leveling quantity delta Gap of the pinch roll PR On the basis of original control, the pressure or the roll gap of the pinch roll at the working side is written with a leveling command in a control system, so that the compensation purpose of automatically calculating the leveling pressure or the roll gap is achieved, the pressure or the roll gap of the pinch roll at the working side is increased or reduced, and the automatic leveling function of the tail part of the pinch roll is realized. After the steel is thrown by the strip steel pinch roll, the pressure or the roll gap compensated by the working side pinch roll on the basis of original control is recovered.
The method is characterized in that when the deviation of the center line of the finish rolling tail is more than 60mm, the occurrence rate of strip steel tail edge overflow defects is obviously increased, when the deviation of the center line of the finish rolling tail is less than 60mm, the influence on the tail rolling shape is small, so that when the absolute value of the deviation of the center line of the finish rolling tail is less than 60mm, a pinch roll pre-leveling function is not put into use, in order to avoid the problem of overshoot caused by the deviation of the leveling quantity of the pinch roll, the pressure leveling range of the pinch roll is-6 KN to 6KN, and when the pressure leveling range exceeds the upper limit and the lower limit, the corresponding upper limit and lower limit values are taken as the adjusting value; the pinch roll gap leveling value ranges from-0.2 mm to 0.2mm, when the upper limit and the lower limit are exceeded, the corresponding upper limit and lower limit values are taken as the adjusting values, and the upper limit and the lower limit of the pinch roll pressure or the roll gap leveling value can be adjusted according to the actual conditions of the production line.
According to the control method for leveling the coiling pinch roll by the center line deviation of the tail of the finishing mill, the quality problem caused by the deviation of the tail of the strip steel after finish rolling and steel throwing can be effectively improved.
Drawings
The invention is further described below with reference to the drawings and examples of the invention.
FIG. 1 is a flow chart of the processing method of the present invention.
FIG. 2 is a schematic view of the finish rolling structure of the coiler according to the present invention.
FIG. 3 is a schematic diagram of the leveling of the tail offset pinch rolls of the strip of the present invention.
In fig. 2: the device comprises a finish rolling working roll 1, a layer cooling roller way 2, rolled strip steel 3, a finish rolling central line deviation detection device 4, a side guide plate 5, an upper pinch roll 6, a lower pinch roll 7, a wrapper roll 8 and a winding drum 9.
Detailed Description
Embodiment one:
after the finish rolling end frame throws steel, the finish rolling tail center line deviation is detected by a finish rolling center line deviation detecting device, the average value of the finish rolling center line deviation within 200ms after F1 throws steel is taken as P1, the average value P2 of the finish rolling center line deviation within 200ms before the finish rolling outlet finish rolling center line deviation detecting device signal is OFF is taken, and the P2 is subtracted by P1 to obtain the finish rolling tail center line deviation, so that the finish rolling tail center line deviation Pt is determined.
The pinch roll pressure leveling quantity DeltaFor is calculated by combining the finish rolling tail center line deviation quantity Pt, the strip steel width W, the strip steel thickness H, the strip steel hardness group hard and the like PR 。
When the pinch adopts a pressure control mode, the pressure leveling quantity of the pinch roll according to the central line difference of the finish rolling tail part is as follows:
wherein:
△For PR -pinch roll pressure leveling calculation (KN);
pt—finish rolling tail center line offset deflection (mm);
w-rolling target width (mm) of strip steel;
h, rolling target thickness (mm) of strip steel;
hard-hardness group of strip steel.
Wherein, pt is positive value and represents the actual deflection working side of the strip steel, pt is negative value and represents the actual deflection driving side of the strip steel, and the pinch roll pressure leveling quantity DeltaFor PR The positive value indicates that the set pressure on the working side (pressure working side) is increased, and the pinch roll pressure is regulated by the pressure regulating amount DeltaFor PR A negative value indicates a decrease in the working side set pressure (lifting of the working side).
According to the determined pinch roll pressure leveling quantity DeltaFor PR The pressure of the pinch roll at the working side is written with a leveling instruction on the basis of original control, so that the compensation purpose of automatically calculating the leveling pressure is achieved, the pressure of the pinch roll at the working side is increased or reduced, the automatic leveling function of the tail part of the pinch roll is realized, and after the steel is thrown by the pinch roll at the working side, the compensated pressure of the pinch roll at the working side is recovered on the basis of original control.
Meanwhile, in order to avoid unnecessary adjustment, when the absolute value of the deflection of the center line of the finish rolling tail is smaller than 60mm, a pinch roll pre-adjustment function is not used, in order to avoid the problem of overshoot caused by the fact that the pinch roll is too much in adjustment, the pressure leveling range of the pinch roll is-6 KN to 6KN, when the pressure leveling range exceeds the upper limit and the lower limit, the adjusting value takes corresponding upper limit and lower limit values, and the upper limit and the lower limit of the pressure leveling range of the pinch roll can be adjusted in combination with the actual situation of a production line.
Embodiment two:
after the finish rolling end frame throws steel, the finish rolling center line deviation detection device detects the center line deviation of the finish rolling tail, the average value of the finish rolling center line deviation within 200ms after F1 throws steel is taken as P1, the average value P2 of the finish rolling center line deviation within 200ms before the finish rolling outlet finish rolling center line deviation detection device signal OFF is taken, and the P2 is subtracted by P1 to obtain the center line deviation of the finish rolling tail, so that the center line deviation Pt of the finish rolling tail is determined.
The roll Gap leveling quantity delta Gap of the pinch roll is calculated by combining the center line deviation quantity Pt of the finish rolling tail, the width W of the strip steel, the thickness H of the strip steel, the hardness group hard of the strip steel and the like PR 。
When the pinch adopts a position control mode, the roll gap leveling quantity of the pinch roll according to the center line deviation quantity of the finish rolling tail part is as follows:
wherein:
△Gap PR -pinch roll gap leveling calculation (mm);
pt—finish rolling tail center line offset deflection (mm);
w-rolling target width (mm) of strip steel;
h, rolling target thickness (mm) of strip steel;
hard-hardness group of strip steel.
Wherein, pt is positive value and represents the actual deflection working side of the strip steel, pt is negative value and represents the actual deflection driving side of the strip steel, and the roll Gap leveling quantity delta Gap of the pinch roll PR The positive value indicates that the roll gap of the working side is increased (the working side is lifted), and the pressure of the pinch roll is regulated by the pressure regulating quantity DeltaFor PR Negative values indicate a decrease in the working side roll gap (pressure working side).
According to the determined roll Gap leveling quantity delta Gap of the pinch roll PR The roll gap of the pinch roll on the working side is written with a leveling instruction on the basis of original control, so that the compensation purpose of automatically calculating the leveling roll gap is achieved, the roll gap of the pinch roll on the working side is increased or reduced, the automatic leveling function of the tail part of the pinch roll is realized, and after the steel is thrown by the pinch roll on the strip steel, the compensated roll gap of the pinch roll on the working side on the basis of original control is recovered.
Meanwhile, in order to avoid unnecessary adjustment, when the absolute value of the deflection of the center line of the finish rolling tail is smaller than 60mm, a pinch roll pre-adjustment function is not used, in order to avoid the problem of overshoot caused by the fact that the pinch roll is too much in adjustment, the range of the pinch roll gap adjustment value is-0.2 mm to 0.2mm, when the range exceeds the upper limit and the lower limit, the corresponding upper limit and the lower limit of the adjustment value are taken, and the upper limit and the lower limit of the pinch roll gap adjustment value can be adjusted in combination with the actual conditions of a production line.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and are not intended to limit the scope of the present invention, but all equivalent control or modification made according to the spirit of the main technical solution of the present invention should be included in the scope of the present invention.
Claims (7)
1. A control method for leveling a coiling pinch roll according to the tail center line deviation of a finishing mill is characterized by comprising the following steps of: and leveling the pressure or the roll gap of the pinch roll by the center line deviation of the finish rolling tail part.
2. The control method for leveling a take-up pinch roll according to the finish rolling mill tail center line deviation as claimed in claim 1, wherein: and calculating the center line deviation of the finish rolling tail part, and determining the center line deviation Pt of the finish rolling tail part.
3. The control method for leveling a take-up pinch roll according to the finish rolling mill tail center line deviation as claimed in claim 1, wherein: the pressure leveling quantity DeltaFor of the pinch roll is calculated by the center line deviation quantity Pt of the finish rolling tail, the width W of the strip steel, the thickness H of the strip steel, the hardness group hard of the strip steel and the like PR Or the roll Gap leveling quantity delta Gap of the pinch roll PR 。
4. A control method for leveling a take-up pinch roll according to finish rolling mill tail center line deviation as claimed in claim 3, wherein: the pinch roll pressure leveling quantity DeltaFor PR Or the roll Gap leveling quantity delta Gap of the pinch roll PR On the basis of original control, the pressure or the roll gap of the pinch roll at the working side is written with a leveling command in a control system, so that the compensation purpose of automatically calculating the leveling pressure or the roll gap is achieved, and the pressure or the roll gap of the pinch roll at the working side is increased or reduced.
5. A control method for leveling a take-up pinch roll according to finish rolling mill tail center line deviation as claimed in claim 3, wherein: the pinch roll pressure leveling quantity of the finish rolling tail center line difference is as follows:
。
6. a control method for leveling a take-up pinch roll according to finish rolling mill tail center line deviation as claimed in claim 3, wherein: the roll gap leveling amount of the pinch roll of the center line deviation amount of the finish rolling tail part is as follows:
7. the control method for leveling a take-up pinch roll according to the finish rolling mill tail center line deviation as claimed in claim 1, wherein: when the deviation of the center line of the finish rolling tail is more than 60mm, the occurrence rate of strip steel tail edge overflow defects is obviously increased, when the deviation of the center line of the finish rolling tail is less than 60mm, the influence on the tail coil shape is small, so that when the absolute value of the deviation of the center line of the finish rolling tail is less than 60mm, a pinch roll pre-leveling function is not put into use, in order to avoid the problem of overshoot caused by the deviation of the leveling quantity of the pinch roll, the pressure leveling range of the pinch roll is-6 KN to 6KN, and when the pressure leveling range exceeds the upper limit and the lower limit, the adjusting value takes corresponding upper limit value and lower limit value; the pinch roll gap leveling value ranges from-0.2 mm to 0.2mm, when the upper limit and the lower limit are exceeded, the corresponding upper limit and lower limit values are taken as the adjusting values, and the upper limit and the lower limit of the pinch roll pressure or the roll gap leveling value can be adjusted according to the actual conditions of the production line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211194834.1A CN116020882A (en) | 2022-09-29 | 2022-09-29 | Control method for leveling coiling pinch roll according to tail center line deviation of finishing mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211194834.1A CN116020882A (en) | 2022-09-29 | 2022-09-29 | Control method for leveling coiling pinch roll according to tail center line deviation of finishing mill |
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| Publication Number | Publication Date |
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| CN116020882A true CN116020882A (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211194834.1A Pending CN116020882A (en) | 2022-09-29 | 2022-09-29 | Control method for leveling coiling pinch roll according to tail center line deviation of finishing mill |
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| CN (1) | CN116020882A (en) |
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- 2022-09-29 CN CN202211194834.1A patent/CN116020882A/en active Pending
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