An ellipticity control method and system for a roller ring mill based on dynamic detection of ellipticity

Abstract

This invention relates to the field of ring rolling mill technology, and particularly to a method and system for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection. The method includes: using a laser rangefinder to collect the laser distance at measurement point i of the ring in real time, obtaining the ring wall thickness at measurement point i; using a main roller encoder to obtain the radian coordinates of measurement point i; calculating the outer diameter, inner diameter, and middle diameter of the ring; calculating the ring radius, original reference radius, and effective radius at each measurement point i; calculating the length of the major and minor semi-axis of the ring, and then calculating the ellipticity; determining whether the ellipticity meets the set value; if not, calculating the core roller compensation amount and performing radial compensation; and repeating the above steps until the ring is processed according to a preset diameter increase and height / wall thickness processing program. This invention improves the processing efficiency and forming quality of the ring.

Description

Technical Field

[0001] This invention relates to the field of ring rolling mill technology, and in particular to a method and system for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection. Background Technology

[0002] In the field of large metal ring rolling, the accuracy of ellipticity control directly determines the product qualification rate. Currently, when using large ring rolling mills to produce rings, due to their excessive size (≥15 meters) and extremely high temperatures, measurement is impossible. Ellipticity is primarily determined by manual visual inspection, with workers relying on experience to judge ellipticity and adjust the mandrel feed. The operator's experience directly influences the ellipticity quality of the product. Ring scrap due to out-of-tolerance ellipticity results in significant waste of materials and energy. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention provides a method and system for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection, solving the technical problem of poor ring forming quality caused by relying on manual judgment of ellipticity in the prior art, and improving the processing efficiency and forming quality of rings.

[0004] This invention provides a method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection, comprising the following steps: S1: Several sets of laser rangefinders are installed on the conical roller support of the ring rolling mill. The laser rangefinders collect the laser distance at the measuring point i of the ring in real time. The control system of the ring rolling mill obtains the ring wall thickness at measurement point i. The main roller encoder of the ring rolling mill acquires the radian coordinates of measurement point i for each ring. ; S2: Calculate the outer diameter of the ring according to step S1. , ring inner diameter , Ring diameter ; S3: Calculate the radius of the ring at each measurement point i based on step S2. Original reference radius Effective radius ; S4: Calculate the length of the major semi-axis of the ring according to step S3. and the length of the short half-axis Then calculate the ellipticity. ; S5: Determine the ellipticity calculated in step S4. Does it meet the set value? If it does, then the core roller compensation amount... If the value is 0, calculate the core roller compensation amount. The ring rolling mill is based on the compensation amount of the core roller. The drive mandrel performs radial compensation action to adjust the rolling deformation of the ring; S6: Repeat steps S1 to S5 until the ring is processed according to the preset diameter increase and height / wall thickness processing program.

[0005] A further improvement of the present invention on the ellipticity control method of a ring rolling mill based on dynamic ellipticity detection is that step S1 further includes the following step: Define the radian coordinates of a measuring point on a ring corresponding to the conical roller of the ring rolling mill. A value of 0 defines the radian coordinates of a measurement point on a ring corresponding to the main roller of the ring rolling mill. It is 180°±5°.

[0006] A further improvement of the present invention, a method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection, is that step S2 includes: in, This represents the installation position constant of the compensated laser rangefinder. This represents the instantaneous calculated value of the ring's pitch diameter; right Perform filtering processing. , in, express The diameter of the ring at that moment, This represents the weight coefficients of the filtering algorithm. The value ranges from 0.1 to 0.4. express The diameter of the ring at that moment, This indicates the data acquisition time of the laser rangefinder.

[0007] A further improvement of the present invention on the ellipticity control method of a ring rolling mill based on dynamic ellipticity detection is that step S3 includes the following steps: Generate radian coordinates , Ring diameter Two-dimensional array , in, This represents the radian coordinates of the first ring component measurement point. This indicates the radian coordinates of the measurement point on the second ring component. This represents the radian coordinates of the i-th ring component measurement point. This represents the radian coordinates of the nth ring component measurement point. This indicates the mean diameter of the ring at the first measurement point. This indicates the mean diameter of the ring at the second measurement point. This represents the mid-diameter of the ring at the i-th measurement point. This represents the mean diameter of the ring at the nth measurement point. The two-dimensional array radian coordinates in , Ring diameter Updates are performed using a first-in, first-out (FIFO) method. According to the two-dimensional array Calculate the radius of the ring component , ; Calculate the original reference radius , ; Calculate the standard deviation of the radius , ; Establish an outlier removal mechanism when At that time, Marked as outliers and removed, the effective radius is then calculated based on the radius of the ring component after removing outliers. , .

[0008] A further improvement of the present invention, a method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection, is that step S4 includes: The maximum value among all ring radii after removing outliers is taken as the major semi-axis of the ring, and the length of the major semi-axis of the ring is calculated. , ; Obtain the radian coordinates corresponding to the major semi-axis , ,in, Indicates the first The radian coordinates corresponding to the measurement points of each ring component Indicates the first index of the measurement point of the ring component. The measurement point of the ring component corresponding to the maximum value among all ring component radii after removing outliers. Indicates the first The radius of the ring component corresponding to each measurement point of the ring component; The minimum value among all ring radii after removing outliers is identified as the minor semi-axis of the ring, and the length of the minor semi-axis of the ring is calculated. , ; Obtain the radian coordinates corresponding to the minor semi-axis , ,in, Indicates the first The radian coordinates corresponding to the measurement points of each ring component The second index represents the measurement point of the ring component. The measurement point of the ring component corresponding to the minimum value among all ring component radii after removing outliers. Indicates the first The radius of the ring component corresponding to each measurement point of the ring component; Calculate ellipticity , .

[0009] A further improvement of the ellipticity control method for a ring rolling mill based on dynamic ellipticity detection in this invention is that step S5 calculates the core roller compensation amount. Previously, it also included: Define the influence zone of the main roller; When the radian coordinates corresponding to the minor semi-axis When in the influence zone of the main roll, the compensation amount of the core roll The calculation formula is: ,in, Indicates the weight factor of the first position. Indicates the compensation coefficient; When the semi-major axis corresponds to the radian coordinates When in the influence zone of the main roll, the compensation amount of the core roll The calculation formula is: ,in, This indicates the weighting factor for the second position. This represents the compensation coefficient.

[0010] A further improvement of the present invention, a method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection, is that it further includes: Ring rolling mill for obtaining ring temperature The adaptive module of the ring rolling mill adjusts according to the ring temperature. Dynamically adjust compensation coefficient , ,in, Represents the material property constants of the ring component. Indicates ambient temperature.

[0011] A further improvement of the ellipticity control method for a ring rolling mill based on dynamic ellipticity detection of the present invention is that the influence zone of the main roller is the ±15° range extending from the line connecting the centers of the main roller and the core roller to both sides of the center of the main roller.

[0012] An ellipticity control system for a ring rolling mill based on dynamic ellipticity detection is used to implement the ellipticity control method for the ring rolling mill as described above. It includes a data acquisition module, a data processing module, an ellipticity processing module, and a core roller compensation unit that are connected in sequence via communication. The core roller compensation unit is connected in communication to the core roller hydraulic actuator of the ring rolling mill. The data acquisition module is used to acquire the laser distance at measurement point i of the ring. The wall thickness of the ring at measurement point i Radian coordinates of measurement point i of each ring component ; The data processing module is used to process the data acquired by the data acquisition module to obtain the outer diameter of the ring. , ring inner diameter , Ring diameter The radius of the ring at each measurement point i of the ring component. Original reference radius Effective radius ; The ellipticity processing module is used to calculate the length of the major semi-axis of the ring. Length of the short half-axis Ellipticity ; The core roller compensation unit is used to calculate the core roller compensation amount. The core roller compensation amount The output is sent to the core roller hydraulic actuator to achieve radial compensation of the core roller.

[0013] This invention achieves real-time dimensional acquisition of large, high-temperature ring components using a laser rangefinder and a main roller encoder, solving the industry pain points of traditional manual visual inspection, such as lag, poor accuracy, and lack of quantification. The main roller encoder can acquire radian coordinates, achieving a one-to-one correspondence between the measurement point position and the radial dimension, providing a reliable raw data foundation for ellipticity analysis. By calculating the original reference radius and effective radius, and incorporating an outlier removal mechanism, the invention effectively eliminates the influence of interference factors such as oxide scale and sensor signal fluctuations on the measurement data, removes false extreme points, ensures the smoothness and authenticity of the ring component radius data, avoids ellipticity misjudgment caused by noisy data, and improves the accuracy and stability of subsequent calculations. Based on the filtered radius data, the major and minor semi-axes are accurately identified, and the ellipticity is quantified using formulas, achieving an objective and quantifiable assessment of the ring component's ellipticity. This completely replaces the traditional qualitative judgment relying on manual experience, improving the consistency and accuracy of ellipticity evaluation and providing a clear quantitative basis for subsequent compensation control. A closed-loop control process of "detection-calculation-compensation-feedback" is established: Based on the ellipticity, it automatically determines whether compensation is needed. If the ellipticity exceeds the tolerance, the compensation amount of the mandrel is precisely calculated, and the mandrel is driven to perform radial compensation, effectively suppressing the expansion of ellipticity and significantly improving the roundness accuracy of the ring. This solves the industry problem of difficulty in correcting ellipticity deviations in large rings. The closed-loop control process is executed cyclically to continuously improve the ellipticity of the ring, significantly reducing the scrap rate of rings caused by ellipticity deviations and reducing material and energy waste. This invention's control method replaces manual inspection and experience-based adjustments, reducing manual operation costs and errors, and improving the production efficiency and product qualification rate of large ring rolling.

[0014] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an ellipticity control method for a ring rolling mill based on dynamic ellipticity detection.

[0017] Figure 2 This is a schematic diagram of a ring rolling machine in operation. Figure 1 .

[0018] Figure 3 This is a schematic diagram of a ring rolling machine in operation. Figure 2 .

[0019] Figure label: 101. Laser rangefinder; 102. Main roller; 103. Core roller; 104. Clamping roller; 105. Conical roller; 106. Ring component; 301. Short half-shaft; 302. Long half-shaft; 303. Main roller influence zone. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The following embodiments are used to illustrate this invention but should not be used to limit the scope of this invention.

[0021] The following is combined Figures 1 to 3 This invention describes an ellipticity control method for a ring rolling mill based on dynamic ellipticity detection. The ring rolling mill includes a main roller 102, a core roller 103, a retaining roller 104, a conical roller 105, and a control system. The method includes the following steps: S1: Several sets of laser rangefinders 101 are installed on the conical roller support of the ring rolling mill. The laser rangefinders 101 collect the laser distance of the measuring point i of the ring in real time. The control system of the ring rolling mill obtains the ring wall thickness at measurement point i. The main roller encoder of the ring rolling mill acquires the radian coordinates of measurement point i for each ring. ; S2: Calculate the outer diameter of the ring according to step S1. , ring inner diameter , Ring diameter ; S3: Calculate the radius of the ring at each measurement point i based on step S2. Original reference radius Effective radius ; S4: Calculate the length of the major semi-axis of ring 106 according to step S3. and the length of the short half-axis Then calculate the ellipticity. ; S5: Determine the ellipticity calculated in step S4. Does it meet the set value? If it does, then the core roller compensation amount... If the value is 0, calculate the core roller compensation amount. The ring rolling mill is based on the compensation amount of the core roller. The drive mandrel performs radial compensation action to adjust the rolling deformation of the ring; S6: Repeat steps S1 to S5 until the ring 106 is processed according to the preset diameter increase and height wall thickness processing program.

[0022] Furthermore, step S1 also includes the following steps: Define the radian coordinates of a ring measuring point corresponding to the conical roller 105 of the ring rolling mill. The value is 0, defining the radian coordinates of a ring measuring point corresponding to the main roller 102 of the ring rolling mill. It is 180°±5°.

[0023] The laser rangefinder 101 is a high-temperature resistant laser rangefinder 101. The laser beam of the laser rangefinder 101 vertically illuminates the ring component, which rotates uniformly under the drive of the main roller 102. The laser rangefinder 101 collects data in real time. The position where the laser beam illuminates the ring component at each sampling moment is a measurement point i, forming a dynamic sampling sequence distributed along the circumference of the ring component. The measurement points only cover half of the ring component's circumference. The half-circumference data is sufficient to meet the identification requirements of the major semi-axis 302 and the minor semi-axis 301, while reducing the computational load and ensuring real-time control. Combining the ring component's rotation speed and sampling frequency ensures that a sufficient number of measurement points are distributed within the half-circumference to meet the angular resolution requirements for ellipticity calculation. A first-in-first-out (FIFO) buffer mechanism is used to update the data, retaining only the measurement point data of the latest half-circumference to avoid redundancy.

[0024] Specifically, the laser rangefinder 101 uses a high-speed analog input module for data acquisition. The high-speed communication interface module of the high-speed analog input module communicates with the CPU via an isochronous synchronization network to achieve high-speed data acquisition. The isochronous synchronization network enables high-speed communication, allowing data acquisition at a frequency >100Hz, thereby measuring the laser distance. .

[0025] Furthermore, step S2 includes: in, This represents the installation position constant of the compensated laser rangefinder. This represents the instantaneous calculated value of the ring's pitch diameter; right Perform filtering processing. , in, express The diameter of the ring at that moment, This represents the weight coefficients of the filtering algorithm. The value ranges from 0.1 to 0.4. express The diameter of the ring at that moment, This indicates the data acquisition time of the laser rangefinder.

[0026] Better place, The value range is 0.1~0.4. Parameter tuning can be performed according to the following steps: Baseline setting, first set... Set the value to 0.2; observe the noise bandwidth and the filtered curve. If the curve still jumps up and down following the shaking of the oxide scale (i.e., the "burrs" are not completely eliminated), it indicates that the noise is too strong, and you should try to reduce the value. To 0.1 or even lower; verify the response speed. Once a smooth curve is established, it is necessary to test whether the filter can promptly reflect changes in the actual diameter of the ring component. If severe hysteresis is found, the filter can be appropriately increased. Up to 0.3 or 0.4.

[0027] The filtering process effectively eliminates the fluctuations in the instantaneous value of the ring's mid-diameter caused by factors such as minute vibrations on the ring surface and measurement noise from the laser rangefinder 101, making the obtained ring mid-diameter data closer to its true value, and providing stable and reliable basic data for the subsequent accurate calculation of ellipticity.

[0028] Further, step S3 includes the following steps: Generate radian coordinates , Ring diameter Two-dimensional array , in, This represents the radian coordinates of the first ring component measurement point. This indicates the radian coordinates of the measurement point on the second ring component. This represents the radian coordinates of the i-th ring component measurement point. This represents the radian coordinates of the nth ring component measurement point. This indicates the mean diameter of the ring at the first measurement point. This indicates the mean diameter of the ring at the second measurement point. This represents the mid-diameter of the ring at the i-th measurement point. This represents the mean diameter of the ring at the nth measurement point. The two-dimensional array radian coordinates in , Ring diameter Updates are performed using a first-in, first-out (FIFO) method. According to the two-dimensional array Calculate the radius of the ring component , ; Calculate the original reference radius , ; Calculate the standard deviation of the radius , ; Establish an outlier removal mechanism when At that time, Marked as outliers and removed, the effective radius is then calculated based on the radius of the ring component after removing outliers. , .

[0029] The first-in, first-out (FIFO) approach involves adding new measurement point data (including corresponding radian coordinates and the ring's mean diameter) as a new element to the end of the two-dimensional array when it is generated. Simultaneously, the oldest set of data stored in the array is removed, ensuring that the array always contains the latest, predetermined number of measurement point information. This update mechanism reflects the ring's latest state during the rolling process in real time, providing timely and effective data support for subsequent ellipticity calculations and control strategy adjustments. This dynamic data update method avoids calculation delays or interference with current state judgment caused by excessive historical data, guaranteeing the real-time performance and accuracy of ellipticity detection.

[0030] By eliminating outliers through an outlier removal mechanism, the impact of individual deviations caused by momentary sensor interference, impurities on the surface of the component, or sudden fluctuations in the measurement system on the overall detection results can be effectively avoided, ensuring that the basic data used in ellipticity calculation has high reliability and stability.

[0031] Further, step S4 includes: The maximum value among all ring radii after removing outliers is taken as the major semi-axis 302 of the ring, and the length of the major semi-axis of the ring is calculated. , ; Obtain the radian coordinates corresponding to the major semi-axis 302. , ,in, Indicates the first The radian coordinates corresponding to the measurement points of each ring component Indicates the first index of the measurement point of the ring component. The measurement point of the ring component corresponding to the maximum value among all ring component radii after removing outliers. Indicates the first The radius of the ring component corresponding to each measurement point of the ring component; The minimum value among all ring radii after removing outliers is identified as the minor axis 301 of the ring, and the length of the minor axis of the ring is calculated. , ; Obtain the radian coordinates corresponding to the minor semi-axis 301. , ,in, Indicates the first The radian coordinates corresponding to the measurement points of each ring component The second index represents the measurement point of the ring component. The measurement point of the ring component corresponding to the minimum value among all ring component radii after removing outliers. Indicates the first The radius of the ring component corresponding to each measurement point of the ring component; Calculate ellipticity , .

[0032] Preferably, by calculating the ellipticity, the degree of elliptical deformation of the ring during the rolling process can be reflected in real time. The calculated ellipticity value is compared with a preset allowable ellipticity threshold. When the ellipticity exceeds the threshold, the system can promptly issue an adjustment signal to dynamically correct the ellipticity of the ring, ensuring that the ring maintains good roundness throughout the rolling process, thereby improving the processing accuracy and product quality of the ring.

[0033] Further, step S5 calculates the core roller compensation amount. Previously, it also included: Define the main roller's affected area as 303; When the minor semi-axis 301 corresponds to the radian coordinate When the core roller is in the influence zone 303 of the main roller, the compensation amount of the core roller is... The calculation formula is: ,in, Indicates the weight factor of the first position. Indicates the compensation coefficient; When the semi-major axis 302 corresponds to the radian coordinates When the core roller is in the influence zone 303 of the main roller, the compensation amount of the core roller is... The calculation formula is: ,in, This indicates the weighting factor for the second position. This represents the compensation coefficient.

[0034] Preferably, the main roll influence zone 303 can be set as a specific arc range extending circumferentially along the ring, with the main roll's central axis as a reference. The size of this range is related to the diameter of the main roll 102, the ring rolling speed, and the deformation resistance of the ring material. For example, when the main roll 102 has a larger diameter or the ring rolling speed is slower, the area of ​​influence of the main roll 102 on the ring is relatively wider, and the arc range of the main roll influence zone 303 can be appropriately expanded; conversely, if the main roll diameter is smaller or the rolling speed is faster, the arc range of the main roll influence zone 303 can be correspondingly reduced. Meanwhile, the values ​​of the first position weighting factor and the second position weighting factor are not fixed but dynamically adjusted according to the specific position of the short half-axis 301 or the long half-axis 302 within the main roll influence zone 303. When the radian coordinates of the short semi-axis 301 or the long semi-axis 302 are closer to the center of the main roll's influence zone 303, the value of the position weight factor is larger, indicating that the main roll at that position has a higher influence on the elliptical deformation of the ring, and the adjustment range of the mandrel compensation should also increase accordingly. Conversely, when the radian coordinates gradually deviate from the center of the main roll's influence zone 303, the value of the position weight factor gradually decreases, and the adjustment range of the mandrel compensation is correspondingly reduced to avoid over-compensation leading to new deformations in the ring. Furthermore, the compensation coefficient, as a key parameter reflecting the material properties of the ring and the requirements of the rolling process, needs to be calibrated through a large amount of rolling test data to ensure that it can accurately match the ellipticity compensation requirements of rings of different materials and specifications, thereby achieving refined control of the mandrel compensation.

[0035] Furthermore, it also includes: Ring rolling mill for obtaining ring temperature The adaptive module of the ring rolling mill adjusts according to the ring temperature. Dynamically adjust compensation coefficient , ,in, Represents the material property constants of the ring component. Indicates ambient temperature.

[0036] Preferably, carbon steel material ≈0.18, for alloy steel materials ≈0.22, for high-temperature alloy materials ≈0.25, which can be fine-tuned according to the actual situation. The value is 20.

[0037] Ideally, rings made of different materials exhibit varying plastic deformation capabilities and elastic recovery characteristics at different temperatures. For instance, at high temperatures, the yield strength and deformation resistance of metal rings decrease. Using the compensation coefficient from room temperature in such cases might result in insufficient mandrel compensation, failing to effectively correct elliptical deformation. Conversely, at lower ring temperatures, material hardness increases, making deformation more difficult, and excessive compensation could lead to ring cracking. By introducing ring temperature parameters and dynamically correcting the compensation coefficient based on ambient temperature, the compensation coefficient can better reflect the physical state of the ring at the actual rolling temperature. For example, when the ring temperature is higher than ambient temperature and the material property constants are known, the compensation coefficient increases accordingly to accommodate the material's greater susceptibility to plastic deformation at high temperatures, ensuring sufficient mandrel compensation to offset the additional elliptical tendency caused by high-temperature softening. Conversely, when the ring temperature is close to or lower than ambient temperature, the compensation coefficient decreases appropriately to avoid over-compensation due to increased material rigidity. This temperature-based adaptive adjustment mechanism further improves the accuracy and real-time performance of the compensation coefficient, enabling the ring rolling mill to achieve precise control of the ellipticity of the rings under different working conditions.

[0038] The present invention also provides an ellipticity control system for a ring rolling mill based on dynamic ellipticity detection, comprising a data acquisition module, a data processing module, an ellipticity processing module, and a core roller compensation unit connected in sequence via communication. The core roller compensation unit is connected in communication to the core roller hydraulic actuator of the ring rolling mill. The data acquisition module is used to acquire the laser distance at measurement point i of the ring. The wall thickness of the ring at measurement point i Radian coordinates of measurement point i of each ring component ; The data processing module is used to process the data acquired by the data acquisition module to obtain the outer diameter of the ring. , ring inner diameter , Ring diameter The radius of the ring at each measurement point i of the ring component. Original reference radius Effective radius ; The ellipticity processing module is used to calculate the length of the major semi-axis of the ring. Length of the short half-axis Ellipticity ; The core roller compensation unit is used to calculate the core roller compensation amount. The core roller compensation amount The output is sent to the core roller hydraulic actuator to achieve radial compensation of the core roller.

[0039] This invention utilizes a laser rangefinder 101 and a main roller encoder to achieve real-time dimensional acquisition of large, high-temperature ring components, solving the industry pain points of traditional manual visual inspection, such as lag, poor accuracy, and lack of quantification. The main roller encoder acquires radian coordinates, achieving a one-to-one correspondence between the measurement point position and the radial dimension, providing a reliable raw data foundation for ellipticity analysis. By calculating the original reference radius and effective radius, and incorporating an outlier removal mechanism, the invention effectively eliminates the influence of interference factors such as oxide scale and sensor signal fluctuations on the measurement data, removes false extreme points, ensures the smoothness and authenticity of the ring component radius data, avoids ellipticity misjudgment caused by noisy data, and improves the accuracy and stability of subsequent calculations. Based on the filtered radius data, the major semi-axis 302 and minor semi-axis 301 are accurately identified, and the ellipticity is quantified using a formula, achieving an objective and quantifiable assessment of the ring component's ellipticity. This completely replaces the traditional qualitative judgment relying on manual experience, improving the consistency and accuracy of ellipticity evaluation and providing a clear quantitative basis for subsequent compensation control. Establish a closed-loop control process of "detection-calculation-compensation-feedback": automatically determine whether compensation is needed based on ellipticity, and accurately calculate the compensation amount for the core roller if the ellipticity exceeds the tolerance. The drive core roller 103 performs radial compensation, effectively suppressing ellipticity expansion and significantly improving the roundness accuracy of the ring, solving the industry problem of difficult correction of ellipticity deviations in large rings. The closed-loop control process is executed cyclically to continuously improve the ellipticity of the ring, significantly reducing the scrap rate of rings caused by ellipticity deviations and minimizing material and energy waste. This invention's control method replaces manual inspection and experience-based adjustments, reducing manual operation costs and errors, and improving the production efficiency and product qualification rate of large ring rolling.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection, characterized in that, Includes the following steps: S1: Several sets of laser rangefinders are installed on the conical roller support of the ring rolling mill. The laser rangefinders collect the laser distance at the measuring point i of the ring in real time. The control system of the ring rolling mill obtains the ring wall thickness at measurement point i. The main roller encoder of the ring rolling mill acquires the radian coordinates of measurement point i for each ring. ; S2: Calculate the outer diameter of the ring according to step S1. , ring inner diameter , Ring diameter ; S3: Calculate the radius of the ring at each measurement point i based on step S2. Original reference radius Effective radius ; S4: Calculate the length of the major semi-axis of the ring according to step S3. and the length of the short half-axis Then calculate the ellipticity. ; S5: Determine the ellipticity calculated in step S4. Does it meet the set value? If it does, then the core roller compensation amount... If the value is 0, calculate the core roller compensation amount. The ring rolling mill is based on the compensation amount of the core roller. The drive mandrel performs radial compensation action to adjust the rolling deformation of the ring; S6: Repeat steps S1 to S5 until the ring is processed according to the preset diameter increase and height / wall thickness processing program.

2. The method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection according to claim 1, characterized in that, Step S1 also includes the following steps: Define the radian coordinates of a measuring point on a ring corresponding to the conical roller of the ring rolling mill. A value of 0 defines the radian coordinates of a measurement point on a ring corresponding to the main roller of the ring rolling mill. It is 180°±5°.

3. The method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection according to claim 1, characterized in that, Step S2 includes: in, This represents the installation position constant of the compensated laser rangefinder. This represents the instantaneous calculated value of the ring's pitch diameter; right Perform filtering processing. , in, express The diameter of the ring at that moment, This represents the weight coefficients of the filtering algorithm. The value ranges from 0.1 to 0.

4. express The diameter of the ring at that moment, This indicates the data acquisition time of the laser rangefinder.

4. The ellipticity control method for a ring rolling mill based on dynamic ellipticity detection according to claim 1, characterized in that, Step S3 includes the following steps: Generate radian coordinates , Ring diameter Two-dimensional array , in, This represents the radian coordinates of the first ring component measurement point. This indicates the radian coordinates of the measurement point on the second ring component. This represents the radian coordinates of the i-th ring component measurement point. This represents the radian coordinates of the nth ring component measurement point. This indicates the mean diameter of the ring at the first measurement point. This indicates the mean diameter of the ring at the second measurement point. This represents the mid-diameter of the ring at the i-th measurement point. This represents the mean diameter of the ring at the nth measurement point. The two-dimensional array radian coordinates in , Ring diameter Updates are performed using a first-in, first-out (FIFO) method. According to the two-dimensional array Calculate the radius of the ring component , ; Calculate the original reference radius , ; Calculate the standard deviation of the radius , ; Establish an outlier removal mechanism when At that time, Marked as outliers and removed, the effective radius is then calculated based on the radius of the ring component after removing outliers. , .

5. The ellipticity control method for a ring rolling mill based on dynamic ellipticity detection according to claim 4, characterized in that, Step S4 includes: The maximum value among all ring radii after removing outliers is taken as the major semi-axis of the ring, and the length of the major semi-axis of the ring is calculated. , ; Obtain the radian coordinates corresponding to the major semi-axis , ,in, Indicates the first The radian coordinates corresponding to the measurement points of each ring component Indicates the first index of the measurement point of the ring component. The measurement point of the ring component corresponding to the maximum value among all ring component radii after removing outliers. Indicates the first The radius of the ring component corresponding to each measurement point of the ring component; The minimum value among all ring radii after removing outliers is identified as the minor semi-axis of the ring, and the length of the minor semi-axis of the ring is calculated. , ; Obtain the radian coordinates corresponding to the minor semi-axis , ,in, Indicates the first The radian coordinates corresponding to the measurement points of each ring component The second index represents the measurement point of the ring component. The measurement point of the ring component corresponding to the minimum value among all ring component radii after removing outliers. Indicates the first The radius of the ring component corresponding to each measurement point of the ring component; Calculate ellipticity , .

6. The method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection according to claim 5, characterized in that, Step S5: Calculate the core roller compensation amount Previously, it also included: Define the influence zone of the main roller; When the radian coordinates corresponding to the minor semi-axis When in the influence zone of the main roll, the compensation amount of the core roll The calculation formula is: ,in, Indicates the weight factor of the first position. Indicates the compensation coefficient; When the semi-major axis corresponds to the radian coordinates When in the influence zone of the main roll, the compensation amount of the core roll The calculation formula is: ,in, This indicates the weighting factor for the second position. This represents the compensation coefficient.

7. The method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection according to claim 6, characterized in that, Also includes: Ring rolling mill for obtaining ring temperature The adaptive module of the ring rolling mill adjusts according to the ring temperature. Dynamically adjust compensation coefficient , ,in, Represents the material property constants of the ring component. Indicates ambient temperature.

8. The method for controlling the ellipticity of a ring rolling mill based on dynamic ellipticity detection according to claim 7, characterized in that, The main roller influence zone is the ±15° range extending from the center line of the main roller and the core roller to both sides of the center of the main roller.

9. An ellipticity control system for a ring rolling mill based on dynamic ellipticity detection, characterized in that, The method for controlling the ellipticity of a ring rolling mill according to any one of claims 1 to 8 includes a data acquisition module, a data processing module, an ellipticity processing module, and a core roller compensation unit that are connected in sequence via communication. The core roller compensation unit is connected in communication to the core roller hydraulic actuator of the ring rolling mill. The data acquisition module is used to acquire the laser distance at measurement point i of the ring. The wall thickness of the ring at measurement point i Radian coordinates of measurement point i of each ring component ; The data processing module is used to process the data acquired by the data acquisition module to obtain the outer diameter of the ring. , ring inner diameter , Ring diameter The radius of the ring at each measurement point i of the ring component. Original reference radius Effective radius ; The ellipticity processing module is used to calculate the length of the major semi-axis of the ring. Length of the short half-axis Ellipticity ; The core roller compensation unit is used to calculate the core roller compensation amount. The core roller compensation amount The output is sent to the core roller hydraulic actuator to achieve radial compensation of the core roller.

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