CN114061525A - Online roll shape detection error separation method considering roll swing - Google Patents
Online roll shape detection error separation method considering roll swing Download PDFInfo
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- CN114061525A CN114061525A CN202111350565.9A CN202111350565A CN114061525A CN 114061525 A CN114061525 A CN 114061525A CN 202111350565 A CN202111350565 A CN 202111350565A CN 114061525 A CN114061525 A CN 114061525A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
Abstract
The invention provides an on-line roll shape detection error separation method considering roll swing, which comprises the steps of establishing a displacement expression of an axis of a certain element of a working roll in the horizontal and vertical directions by arranging a sensor and according to displacement information of a bearing seat of the working roll, establishing a rotating coordinate system on the basis, establishing a displacement expression of the axis of the certain element of the working roll in the detection direction and the direction vertical to the detection direction, and further establishing an outer contour expression of the roll of the certain element of the working roll. The invention introduces the roller bearing seat position measurement technology into the online detection of the roller shape, separates the measurement error caused by the axial deviation of the roller, establishes an error separation model considering the roller swing, realizes the fine management of the service of the roller, and has important significance for optimizing the roller changing rhythm, improving the shape control capability of the rolling mill and the surface quality of strip steel products.
Description
Technical Field
The invention relates to the technical field of automatic measurement of metallurgical equipment, in particular to an online roll shape detection error separation method considering roll swing.
Background
The shape and surface quality of the strip steel are used as important quality indexes of the strip steel, and the competitiveness of the product is directly influenced. The abrasion of the roller in the strip rolling process is inevitable, the roller seam profile change and the roller surface quality deterioration caused by the roller abrasion have serious influence on the strip shape and the surface quality. In order to ensure the quality of the plate shape and the surface, the requirements of the product on the quality and the plate shape can be met only by frequently changing rolls (rolling for a certain kilometer number) and grinding off-line. The rolling kilometers and the roll changing period limit the flexibility of hot rolling planning and restrict the further improvement of the production operation rate. The On-line Roll Profile Meter (OPM) technology can eliminate the surface abrasion of the Roll in time, optimize the Roll changing rhythm and improve the shape control capability of the rolling mill and the surface quality of strip steel products.
The roll shape online detection working condition has the disadvantages of severe environment, large technical difficulty and high precision requirement, the abrasion caused by the CVC roll shape of the roll or the rolling process is usually expressed by micron, and in the roll shape online detection process, the errors caused by the displacement of the roll, the gap of a rolling mill, the thermal deformation, the straightness and the parallelism of detection equipment and the like are usually in the same order of magnitude as the abrasion of the roll shape or the roll, even are higher than the abrasion of the roll shape or the roll by one order of magnitude, so that the real roll shape is easy to be eaten by the errors in the direct detection process.
Disclosure of Invention
According to the technical problems that the working condition environment of the roll shape online detection is severe, the technical difficulty is high, the precision requirement is high, the abrasion caused by the CVC roll shape or the rolling process of the roll is usually expressed by taking microns as a unit, and in the roll shape online detection process, because errors caused by roll displacement, rolling mill clearance, thermal deformation, straightness and parallelism of detection equipment are usually in the same order of magnitude as the roll shape or the roll abrasion, even higher than the roll shape or the roll abrasion by one order of magnitude, the real roll shape is easy to be eaten by errors during direct detection, the roll shape online detection error separation method considering roll swing is provided. The invention establishes a displacement expression of the axis of a certain element of the working roll in the horizontal and vertical directions mainly by arranging a sensor and according to the displacement information of the bearing seat of the working roll, establishes a rotating coordinate system on the basis, establishes a displacement expression of the axis of the certain element of the working roll in the detection direction and the direction vertical to the detection direction, and further establishes a roll outer contour expression of the certain element of the working roll. The roll shape online detection is introduced into the roll bearing seat position measurement technology, the measurement error caused by the axial deviation of the roll is separated, and an error separation model considering the roll swinging is established, so that the fine management of the service of the roll is realized, and the method has important significance for optimizing the roll changing rhythm, and improving the shape control capability of the rolling mill and the surface quality of strip steel products.
The technical means adopted by the invention are as follows:
an on-line roll shape detection error separation method considering roll swing comprises the following steps:
step one, specifying the horizontal displacement and the vertical displacement of a working roll bearing seat to be detected, and establishing a displacement information model of the working roll bearing seat, wherein the horizontal displacement takes the movement towards the outlet side of a rolling mill as positive and the movement towards the inlet side of the rolling mill as negative, and the vertical displacement takes the upward movement as positive and the downward movement as negative;
step two, according to the displacement information model of the working roll bearing seat obtained in the step one, an axis displacement model of a certain element of the working roll is established, and the axis displacement model comprises a horizontal direction displacement model and a vertical direction displacement model of the axis of the certain element of the working roll;
step three, according to the axis displacement model of the working roll at the certain element obtained in the step two, establishing a rotating coordinate system, and obtaining displacement models of the axis of the working roll at the certain element in the detection direction and the direction perpendicular to the detection direction;
and step four, obtaining a roll outer contour model at a certain element of the working roll by combining a sensor arranged at the outlet side of the working roll of the strip rolling mill according to the displacement models of the axis of the certain element of the working roll in the detection direction and the displacement models perpendicular to the detection direction obtained in the step three.
Further, in the second step, a coordinate system is established with the horizontal direction as the Z axis, the vertical direction as the Y axis, and the initial roll axis as the origin, and the axis displacement model at a certain element of the working roll satisfies the following formula:
wherein Hx,tIs the horizontal displacement of the roller axis at x elements at the time t, HOtFor horizontal displacement of the bearing housing at the operating side at time t, HDtFor horizontal displacement of the drive-side bearing base at time t,/DFor the distance between the position detection device of the bearing seat on the transmission side and the center of the roll bodyOFor the distance, x, between the bearing position detecting device on the operating side and the center of the roll bodyiDetecting position coordinates, V, for the roll surfacex,tIs the displacement of the roller axis at x elements at the time t in the vertical direction, VOtFor vertical displacement of the bearing housing at the operating side at time t, VDtThe transmission side bearing block is displaced in the vertical direction at time t.
Further, in the third step, an included angle between the detection direction of the sensor and the horizontal direction is α, the original coordinate system is rotated counterclockwise by α, that is, the reverse direction of the detection direction of the sensor is taken as the Z 'axis, and the direction perpendicular to the detection direction of the sensor is taken as the Y' axis to establish a rotation coordinate system, and displacement models of the axis of the working roll at a certain element in the detection direction and the direction perpendicular to the detection direction satisfy the following formula:
Hx,t,Vx,t|z'＝Hx,tcosα+Vx,tsinα；
Hx,t,Vx,t|y'＝-Hx,tsinα+Vx,tcosα；
wherein Hx,t,Vx,t|z'Is Hx,tAnd Vx,tProjection in the z' direction, Hx,t,Vx,t|y'Is Hx,tAnd Vx,tProjection in the y' direction.
Further, in the fourth step, the outer contour model of the roller at a certain element of the working roller satisfies the following formula:
Lx,t T＝Lx,t+Lx,t'；
wherein, L'x,tFor detection deviations caused by bearing-seat displacement, Dw,xIs the initial diameter of the roll at x elements, Lx,t TFor corrected detection value, Lx,tFor direct post-use roll inspection, L0,xFor the initial measurement of the sensor at x elements, Dw'|x,tIs the roll diameter at x elements at time t.
Further, a group of displacement sensors are arranged on the outlet side of the working roll of the strip rolling mill, the group of displacement sensors comprise a plurality of displacement sensors, the displacement sensors are uniformly distributed and linearly arranged, the total arrangement length of the displacement sensors is the same as the length of the roll body of the working roll, and the axial distances between the displacement sensors and the initial no-load working roll are equal; or a displacement sensor is arranged on the outlet side of the working roll of the strip rolling mill, the displacement sensor can move along the direction parallel to the roll axis, the moving range is the same as the length of the roll body of the working roll, the axial direction of the displacement sensor is vertical to the axial direction of the working roll during initial no-load, the detection direction of the displacement sensor passes through the axial line of the working roll during initial no-load, the included angle between the detection direction of the displacement sensor and the horizontal plane is 40-60 degrees, and the displacement sensor is used for measuring the distance value from the displacement sensor to the surface of the working roll;
the horizontal and vertical displacement information of the bearing seat on the transmission side and the operation side of the working roll of the plate and strip rolling mill can be detected on line by arranging the bearing seat position detection device, wherein the vertical displacement information can also directly adopt the displacement information of a rolling mill screw-down system.
Furthermore, the displacement sensor is a laser sensor, an eddy current sensor or an ultrasonic sensor, or other types of displacement sensors capable of stably working for a long time under the field working condition; the measuring range of the displacement sensor is more than 20mm, the measuring precision is less than 100nm, and the repetition precision is less than 50 nm.
Further, the plate and strip mill is a four-high mill or a six-high mill.
Further, the working roll to be detected is an upper working roll.
Compared with the prior art, the invention has the following advantages:
1. according to the online roll shape detection error separation method considering roll swing, the roll shape online detection is introduced into the roll bearing seat position measurement technology, the measurement error caused by roll axis deviation is separated, an error separation model considering roll swing is established, and the roll shape detection precision can be improved.
2. The online roll shape detection error separation method considering roll swinging can detect the roll shape of the roll on line, realize the fine management of the service of the roll, and has important significance for optimizing the roll change rhythm and improving the shape control capability of a rolling mill and the surface quality of a strip steel product.
In conclusion, the technical scheme of the invention can solve the problems that the online detection working condition environment of the roll shape in the prior art is severe, the technical difficulty is high, the precision requirement is high, the abrasion caused in the roll shape of the roller CVC or the rolling process is usually expressed by taking microns as a unit, and the real roll shape is easy to be eaten by errors when the real roll shape is directly detected because the errors caused by the displacement of the roller, the clearance of the roller, the thermal deformation, the straightness and the parallelism of detection equipment and the like are always in the same order of magnitude as or even higher than the abrasion of the roll shape or the roller by one order of magnitude in the online detection process of the roll shape.
Based on the reasons, the method can be widely popularized in the fields of automatic measurement of metallurgical equipment and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the on-line roll profile inspection of the present invention.
Fig. 2 is a schematic diagram of the spatial position information of the bearing seat according to the present invention.
FIG. 3 is a schematic diagram of the relationship between the detection positions according to the present invention.
FIG. 4 is a schematic diagram of the horizontal displacement geometry of the present invention.
FIG. 5 is a schematic view of an online roll shape detection rotating coordinate system according to the present invention.
FIG. 6 is a schematic diagram of the simulation calculation results of the roll profile testing of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in the figure, the invention provides an online roll shape detection error separation method considering roll swing, which comprises the following steps:
step one, specifying the horizontal displacement and the vertical displacement of a working roll bearing seat to be detected, and establishing a displacement information model of the working roll bearing seat, wherein the horizontal displacement takes the movement towards the outlet side of a rolling mill as positive and the movement towards the inlet side of the rolling mill as negative, and the vertical displacement takes the upward movement as positive and the downward movement as negative;
step two, according to the displacement information model of the working roll bearing seat obtained in the step one, an axis displacement model of a certain element of the working roll is established, and the axis displacement model comprises a horizontal direction displacement model and a vertical direction displacement model of the axis of the certain element of the working roll;
step three, according to the axis displacement model of the working roll at the certain element obtained in the step two, establishing a rotating coordinate system, and obtaining displacement models of the axis of the working roll at the certain element in the detection direction and the direction perpendicular to the detection direction;
and step four, obtaining a roll outer contour model at a certain element of the working roll by combining a sensor arranged at the outlet side of the working roll of the strip rolling mill according to the displacement models of the axis of the certain element of the working roll in the detection direction and the displacement models perpendicular to the detection direction obtained in the step three.
In a preferred embodiment, in the second step, a coordinate system is established with the horizontal direction as the Z axis, the vertical direction as the Y axis, and the initial roll axis as the origin, and the axis displacement model at a certain element of the work roll satisfies the following formula:
wherein Hx,tIs the horizontal displacement of the roller axis at x elements at the time t, HOtFor horizontal displacement of the bearing housing at the operating side at time t, HDtFor horizontal displacement of the drive-side bearing base at time t,/DFor the distance between the position detection device of the bearing seat on the transmission side and the center of the roll bodyOFor the distance, x, between the bearing position detecting device on the operating side and the center of the roll bodyiDetecting position coordinates, V, for the roll surfacex,tIs the displacement of the roller axis at x elements at the time t in the vertical direction, VOtFor vertical displacement of the bearing housing at the operating side at time t, VDtThe transmission side bearing block is displaced in the vertical direction at time t.
In the third step, an included angle between the sensor detection direction and the horizontal direction is α, the original coordinate system is rotated counterclockwise by α, that is, the reverse direction of the sensor detection direction is taken as the Z 'axis, and the axis perpendicular to the sensor detection direction is taken as the Y' axis to establish a rotation coordinate system, and displacement models of the axis of the working roll at a certain element in the detection direction and the axis perpendicular to the detection direction satisfy the following formula:
Hx,t,Vx,t|z'＝Hx,tcosα+Vx,tsinα；
Hx,t,Vx,t|y'＝-Hx,tsinα+Vx,tcosα；
wherein Hx,t,Vx,t|z'Is Hx,tAnd Vx,tProjection in the z' direction, Hx,t,Vx,t|y'Is Hx,tAnd Vx,tProjection in the y' direction.
In the fourth step, the outer contour model of the roll at a certain element of the working roll satisfies the following formula:
Lx,t T＝Lx,t+Lx,t'；
wherein, L'x,tFor detection deviations caused by bearing-seat displacement, Dw,xIs the initial diameter of the roll at x elements, Lx,t TFor corrected detection value, Lx,tFor direct post-use roll inspection, L0,xFor the initial measurement of the sensor at x elements, Dw'|x,tIs the roll diameter at x elements at time t.
As a preferred embodiment, a group of displacement sensors is arranged at the outlet side of the working roll of the strip rolling mill, the group of displacement sensors comprises a plurality of displacement sensors, the displacement sensors are uniformly distributed and linearly arranged among the displacement sensors, the total arrangement length of the displacement sensors is the same as the length of the roll body of the working roll, and the axial distances between the displacement sensors and the initial no-load working roll are all equal; or a displacement sensor is arranged on the outlet side of the working roll of the strip rolling mill, the displacement sensor can move along the direction parallel to the roll axis, the moving range is the same as the length of the roll body of the working roll, the axial direction of the displacement sensor is vertical to the axial direction of the working roll during initial no-load, the detection direction of the displacement sensor passes through the axial line of the working roll during initial no-load, the included angle between the detection direction of the displacement sensor and the horizontal plane is 40-60 degrees, and the displacement sensor is used for measuring the distance value from the displacement sensor to the surface of the working roll;
the horizontal and vertical displacement information of the bearing seat on the transmission side and the operation side of the working roll of the plate and strip rolling mill can be detected on line by arranging the bearing seat position detection device, wherein the vertical displacement information can also directly adopt the displacement information of a rolling mill screw-down system.
As a preferred embodiment, the displacement sensor is a laser sensor, an eddy current sensor, an ultrasonic sensor or other types of displacement sensors capable of stably working for a long time under field working conditions; the measuring range of the displacement sensor is more than 20mm, the measuring precision is less than 100nm, and the repetition precision is less than 50 nm.
In a preferred embodiment, the strip mill is a four-high mill or a six-high mill.
In a preferred embodiment, the work roll to be inspected is an upper work roll.
Example 1
As shown in fig. 1, in an on-line roll shape detection error separation method considering roll oscillation, a group of displacement sensors is arranged at the outlet side of a working roll of a strip rolling mill, the group of displacement sensors comprises a plurality of displacement sensors, the displacement sensors are uniformly distributed and linearly arranged, the total arrangement length of the displacement sensors is the same as the length of a roll body of the working roll, and the axial distances between the displacement sensors and an initial no-load working roll are equal; or a displacement sensor is arranged on the outlet side of the working roll of the strip rolling mill, the displacement sensor can move along the direction parallel to the roll axis, the moving range is the same as the length of the roll body of the working roll, the axial direction of the displacement sensor is perpendicular to the axial direction of the working roll during initial no-load, the detection direction of the displacement sensor passes through the axial line of the working roll during initial no-load, the included angle between the detection direction of the displacement sensor and the horizontal plane is 40-60 degrees, and the displacement sensor is used for measuring the distance value from the displacement sensor to the surface of the working roll. As shown in fig. 2, the bearing seat position detecting device is arranged to realize on-line detection of horizontal and vertical displacement information of the bearing seats on the transmission side and the operation side of the work roll of the strip rolling mill, wherein the vertical displacement information can also directly adopt displacement information of a rolling mill reduction system. The working roll to be detected is an upper working roll, and the displacement sensor is a laser sensor, an eddy current sensor, an ultrasonic sensor or other types of displacement sensors capable of working stably for a long time under the field working condition; the measuring range of the displacement sensor is more than 20mm, the measuring precision is less than 100nm, and the repetition precision is less than 50 nm. The detected positional relationship is shown in fig. 3.
The error separation model considering roll oscillation comprises the following specific calculation steps:
step (1): specifying the horizontal displacement of the working roll bearing seat, wherein the movement towards the outlet side of the rolling mill is positive, and the movement towards the inlet side of the rolling mill is negative; the vertical displacement is positive for upward movement and negative for downward movement. Establishing a displacement expression of the axis of a certain element of the working roll in the horizontal and vertical directions according to the displacement information of the bearing seat of the working roll;
step (2): establishing a rotating coordinate system according to an axis displacement expression at a certain element of the working roll, and establishing a displacement expression of the axis at the certain element of the working roll in the detection direction and the direction perpendicular to the detection direction;
and (3): and establishing a roll outer contour expression at a certain element of the working roll.
Preferably, the strip mill is a four-high mill or a six-high mill.
Preferably, the specific steps of step (1) are as follows: taking the horizontal direction as the Z axis, the vertical direction as the Y axis, and the initial roll axis as the origin to establish a coordinate system, as shown in fig. 1 and 4, the following calculation model is adopted by using the displacement information of the work roll chock:
wherein Hx,tIs the horizontal displacement of the roller axis at x elements at the time t, HOtFor horizontal displacement of the bearing housing at the operating side at time t, HDtFor horizontal displacement of the drive-side bearing base at time t,/DFor the distance between the position detection device of the bearing seat on the transmission side and the center of the roll bodyOFor the distance, x, between the bearing position detecting device on the operating side and the center of the roll bodyiDetecting position coordinates, V, for the roll surfacex,tIs the displacement of the roller axis at x elements at the time t in the vertical direction, VOtFor vertical displacement of the bearing housing at the operating side at time t, VDtThe transmission side bearing block is displaced in the vertical direction at time t.
Preferably, the specific steps of step (2) are as follows: an included angle between the detection direction of the sensor and the horizontal direction is alpha, the coordinate system in fig. 1 is rotated anticlockwise by alpha, namely the reverse direction of the detection direction of the sensor is taken as a Z 'axis, and the direction perpendicular to the detection direction of the sensor is taken as a Y' axis to establish a rotating coordinate system, and as shown in fig. 5, the following calculation model is adopted:
Hx,t,Vx,t|z'＝Hx,tcosα+Vx,tsinα；
Hx,t,Vx,t|y'＝-Hx,tsinα+Vx,tcosα；
wherein Hx,t,Vx,t|z'Is Hx,tAnd Vx,tProjection in the z' direction, Hx,t,Vx,t|y'Is Hx,tAnd Vx,tProjection in the y' direction.
Preferably, the specific steps of step (3) are as follows:
Lx,t T＝Lx,t+Lx,t'；
wherein, L'x,tFor detection deviations caused by bearing-seat displacement, Dw,xIs the initial diameter of the roll at x elements, Lx,t TFor corrected detection value, Lx,tFor direct post-use roll inspection, L0,xFor the initial measurement of the sensor at x elements, Dw'|x,tIs the roll diameter at x elements at time t.
In the above formula, the parameter lD、lOAnd alpha is a constant, and other parameters are vectors.
The distance l between the bearing seat position detection device on the transmission side and the center of the roller bodyDIs 1000mm, and the distance l between the bearing position detection device on the operation side and the center of the roller bodyOIs 980mm, and the initial diameter D of the rollerw,x820mm, initial measurement value L of sensor0300mm, and the angle alpha between the sensor detection direction and the horizontal direction is 30 degrees. The roller to be detected is not worn, at a certain moment, the position x of the roller strip element is 350mm, as shown in a partial enlarged view shown in fig. 6, a dotted line is a direct detection value without error separation, and a solid line is a result processed by an error separation algorithm. It can be seen from the figure that the online roll shape detection error separation method considering roll swing provided by the invention can obviously improve the accuracy of online roll shape detection.
The invention introduces the roller bearing seat position measurement technology into the online detection of the roller shape, separates the measurement error caused by the axial deviation of the roller, establishes an error separation model considering the roller swing, realizes the fine management of the service of the roller, and has important significance for optimizing the roller changing rhythm, improving the shape control capability of the rolling mill and the surface quality of strip steel products.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An online roll shape detection error separation method considering roll swing is characterized by comprising the following steps:
step one, specifying the horizontal displacement and the vertical displacement of a working roll bearing seat to be detected, and establishing a displacement information model of the working roll bearing seat, wherein the horizontal displacement takes the movement towards the outlet side of a rolling mill as positive and the movement towards the inlet side of the rolling mill as negative, and the vertical displacement takes the upward movement as positive and the downward movement as negative;
step two, according to the displacement information model of the working roll bearing seat obtained in the step one, an axis displacement model of a certain element of the working roll is established, and the axis displacement model comprises a horizontal direction displacement model and a vertical direction displacement model of the axis of the certain element of the working roll;
step three, according to the axis displacement model of the working roll at the certain element obtained in the step two, establishing a rotating coordinate system, and obtaining displacement models of the axis of the working roll at the certain element in the detection direction and the direction perpendicular to the detection direction;
and step four, obtaining a roll outer contour model at a certain element of the working roll by combining a sensor arranged at the outlet side of the working roll of the strip rolling mill according to the displacement models of the axis of the certain element of the working roll in the detection direction and the displacement models perpendicular to the detection direction obtained in the step three.
2. The method as claimed in claim 1, wherein in the second step, a coordinate system is established with the horizontal direction as the Z-axis, the vertical direction as the Y-axis, and the initial roll axis as the origin, and the axis displacement model at a certain element of the working roll satisfies the following formula:
wherein Hx,tIs the horizontal displacement of the roller axis at x elements at the time t, HOtFor horizontal displacement of the bearing housing at the operating side at time t, HDtFor horizontal displacement of the drive-side bearing base at time t,/DFor the distance between the position detection device of the bearing seat on the transmission side and the center of the roll bodyOFor the distance, x, between the bearing position detecting device on the operating side and the center of the roll bodyiDetecting position coordinates, V, for the roll surfacex,tIs the displacement of the roller axis at x elements at the time t in the vertical direction, VOtFor vertical displacement of the bearing housing at the operating side at time t, VDtThe transmission side bearing block is displaced in the vertical direction at time t.
3. The method for separating the errors in the roll shape detection considering the roll swinging as claimed in claim 1, wherein in the third step, the included angle between the detection direction of the sensor and the horizontal direction is α, the original coordinate system is rotated counterclockwise by α, that is, the reverse direction of the detection direction of the sensor is the Z 'axis, and the axis perpendicular to the detection direction of the sensor is the Y' axis, so as to establish a rotation coordinate system, and the displacement model of the axis of the working roll in the detection direction and the axis perpendicular to the detection direction satisfies the following formula:
Hx,t,Vx,t|z'＝Hx,tcosα+Vx,tsinα；
Hx,t,Vx,t|y'＝-Hx,tsinα+Vx,tcosα；
wherein Hx,t,Vx,t|z'Is Hx,tAnd Vx,tProjection in the z' direction, Hx,t,Vx,t|y'Is Hx,tAnd Vx,tProjection in the y' direction.
4. The method for separating the errors in the roll shape detection on line by considering the roll swinging as claimed in claim 1, wherein in the fourth step, the outer contour model of the roll at a certain element of the working roll satisfies the following formula:
Lx,t T＝Lx,t+Lx,t'；
wherein, L'x,tFor detection deviations caused by bearing-seat displacement, Dw,xIs the initial diameter of the roll at x elements, Lx,t TFor corrected detection value, Lx,tFor direct post-use roll inspection, L0,xFor the initial measurement of the sensor at x elements, Dw'|x,tIs the roll diameter at x elements at time t.
5. The method for separating errors in roll shape detection in consideration of roll oscillation according to any one of claims 1 to 4, wherein a set of displacement sensors is arranged at the outlet side of the work rolls of the strip rolling mill, the set of displacement sensors includes a plurality of displacement sensors, the plurality of displacement sensors are uniformly distributed and linearly arranged with each other, the total length of the arrangement of the displacement sensors is the same as the length of the roll body of the work roll, and the axial distances between the plurality of displacement sensors and the initial no-load work roll are all the same; or a displacement sensor is arranged on the outlet side of the working roll of the strip rolling mill, the displacement sensor can move along the direction parallel to the roll axis, the moving range is the same as the length of the roll body of the working roll, the axial direction of the displacement sensor is vertical to the axial direction of the working roll during initial no-load, the detection direction of the displacement sensor passes through the axial line of the working roll during initial no-load, the included angle between the detection direction of the displacement sensor and the horizontal plane is 40-60 degrees, and the displacement sensor is used for measuring the distance value from the displacement sensor to the surface of the working roll;
the horizontal and vertical displacement information of the bearing seat on the transmission side and the operation side of the working roll of the plate and strip rolling mill can be detected on line by arranging the bearing seat position detection device, wherein the vertical displacement information can also directly adopt the displacement information of a rolling mill screw-down system.
6. The on-line roll shape detection error separation method considering roll oscillation according to claim 5, wherein the displacement sensor is a laser sensor, an eddy current sensor, or an ultrasonic sensor; the measuring range of the displacement sensor is more than 20mm, the measuring precision is less than 100nm, and the repetition precision is less than 50 nm.
7. The on-line roll shape detection error separation method considering roll oscillation according to claim 5, wherein the strip rolling mill is a four-high mill or a six-high mill.
8. The on-line roll shape detection error separation method considering roll oscillation according to claim 1, wherein the work roll to be detected is an upper work roll.
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