A rolling mill roll grinding management method based on copper strip surface quality

Abstract

The application discloses a kind of based on copper plate strip surface quality roll grinding management method, to solve the existing roll grinding depends on experience, positioning is not accurate, overgrinding or insufficient problem.This method includes: collecting copper plate strip surface copper printing defect and flatness waveform data, and with the rolling speed and roll length count signal of rolling mill time stamp synchronization calibration;Build roll damage reverse diagnosis mechanism, combined with copper printing coordinate calculation damage angle, identify damage type, calculate wear depth;For different damage types generate differentiated grinding work order, execute high-precision positioning grinding;Return to production line after original damage position carries out online real-time monitoring and off-line sample review, dynamically adjust parameter and determine grinding qualified state.The application realizes the precision, differentiation and closed-loop management of roll grinding, effectively improves grinding efficiency and roll service life, significantly improves copper plate strip surface quality, reduces defect rate.

Description

Technical Field

[0001] This invention relates to the field of roll maintenance and management, and in particular to a roll grinding management method based on the surface quality of copper strip. Background Technology

[0002] Insufficient roll flatness can lead to defects in copper strip such as copper markings, wavy lines, and localized dents, sometimes resulting in product scrap. Traditional roll grinding management suffers from the following problems: Experience-based grinding: Relying on visual inspection of the roll surface or fixed-cycle grinding by operators, without establishing a direct correlation with copper strip surface defects, leading to over-grinding or under-grinding; Vague damage diagnosis: Unable to accurately locate the position, type, and depth of roll damage through copper strip surface defects, only able to uniformly cover the damage by grinding the entire roll surface, resulting in shortened roll life; Coarse parameter control: Lack of quantitative basis for setting parameters such as grinding feed rate and taper compensation, leading to repeated occurrences of the same defects and requiring multiple rework adjustments. Therefore, there is an urgent need for a management method that uses copper strip surface quality as the core input to achieve accurate roll damage diagnosis, differentiated grinding, and closed-loop verification of effects, in order to solve the above-mentioned technical pain points. Summary of the Invention

[0003] This invention provides a roll grinding management method based on the surface quality of copper strip. It involves collecting copper stamp position data and flatness waveform data of the rolled copper strip and simultaneously calibrating them; reverse-diagnosing roll damage, calculating damage angles, identifying types, calculating wear depth, and correcting displacement in the roll length direction; generating differentiated grinding work orders and formulating grinding strategies for different damage types; performing positioning grinding and sampling inspection of contour accuracy; and finally monitoring the return rolls to trigger additional grinding or adjust compensation amounts, determining if the grinding is qualified.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for managing the grinding of copper strip rolls based on surface quality includes the following steps:

[0006] Data on the location of copper stamp defects and the flatness waveform data on the surface of the rolled copper strip are collected. The copper stamp location data includes the width direction coordinate X and the roll length direction coordinate Y. The flatness waveform data includes local depressions, periodic wavy lines at a preset distance from the edge, and overall undulation characteristics. The rolling speed and roll length counting signals acquired in real time by the rolling mill PLC system are used to perform time stamp synchronization calibration on the copper stamp coordinates (X,Y) and waveform data.

[0007] Reverse diagnosis of roll damage involves calculating the roll damage angle based on the copper stamp coordinates and identifying the roll damage type by combining the flatness waveform characteristics. Local depressions indicate roll bump wear, edge wavy lines indicate roll edge wear, and overall undulations indicate insufficient middle section contour. The theoretical roll length displacement is calculated based on the actual roll speed. The measured value of the copper stamp coordinate Y is compared with the theoretical value. If the deviation exceeds the preset range, the damage angle is recalculated using the theoretical value. The roll diameter is updated by taking the average value of multiple measurements.

[0008] Generate differentiated grinding work orders; perform targeted reinforcement grinding for wear on protrusions; perform appropriate taper compensation grinding for uneven wear on roller edges; and perform full roller surface compensation reshaping for insufficient mid-section contour.

[0009] High-precision positioning and grinding: the reference line is engraved on the end face of the roll and aligned with the coordinate system of the grinding machine. The damaged angle range is locked with an angle positioning device. After grinding, the laser profilometer is used to check the profile accuracy of key areas to ensure that the height difference of the protrusions and the tapered error of the roll edge meet the standards.

[0010] When the re-grinded rolls return to the production line, the location corresponding to the original damage is monitored in real time: if the copper stamp depth is greater than the preset ratio of the original value before re-grinding, additional re-grinding is performed; if the wavy amplitude exceeds the preset amplitude threshold, the taper compensation amount is increased to match the fluctuation repair ratio; if there are no abnormalities in multiple rolls of strip, the re-grinding is deemed qualified; after the first roll of strip is produced after re-grinding, a sample is taken from the area corresponding to the original damage, the surface copper stamp depth is detected and compared with the monitoring data, and if the deviation exceeds the preset threshold, the monitoring threshold is adjusted according to the manual detection value; if the inspection finds that the edge wavy pattern has periodic fluctuations, even if the online monitoring amplitude does not exceed the threshold, the taper compensation amount is still triggered for adjustment, and the single adjustment amount does not exceed the preset ratio of the original compensation amount.

[0011] As a further aspect of the present invention, the reverse diagnosis of roll damage also includes calculating the roll wear damage depth using a formula. The formula is ,in, The depth of the copper stamp on the surface of the copper strip. The imprint enlargement factor is , This is a correction factor for the hardness ratio of the rolls to the copper strip. The dynamic yield strength of copper strip. The elastic modulus of the roll. The work hardening factor is calculated using a logarithmic function correlation based on the number of steel passes. The number of steel passes is read from the rolling mill PLC and automatically accumulated after each coil is produced. When the number of steel passes exceeds a preset threshold, Take a constant value; H represents the residual thickness of the hardened layer on the roll surface, and H represents the characteristic thickness of the hardened layer on the roll. This indicates the proportion of the current residual thickness to the feature thickness. Let be the attenuation function of the hardened layer, according to The range of the ratio to H corresponds to the output attenuation coefficient. This is a fatigue repair layer.

[0012] As a further aspect of the present invention, the measurement resolution of the laser flatness meter meets the requirements for identifying minute defects on the surface of the copper strip, and the scanning width covers the full width of the copper strip; the local depression is a unidirectional fluctuation within a specific wavelength range, and the valley depth reaches the judgment threshold for surface depression defects; the edge wavy pattern is a periodic undulation with a specific period and amplitude within a specific range from the edge of the strip, and the number of consecutive cycles meets the judgment conditions for effective wavy pattern characteristics.

[0013] As a further aspect of the present invention, during the synchronous calibration of copper printing position and flatness data, the copper printing coordinate Y is corrected by randomly checking the deviation between the actual length of multiple rolls and the roll length counted by the PLC.

[0014] As a further aspect of the present invention, the multi-point measurement of the roll diameter specifically involves using a micrometer to measure at three points: both ends and the midpoint of the roll, and taking the average value of the measurement results as the roll diameter.

[0015] As a further aspect of the present invention, the sample size taken during manual verification is a preset fixed specification, and the number of samples is not less than 3. The average value of the test results of multiple samples is compared with the online monitoring data. The number of rolls of the continuous multi-roll strip is set to the number suitable for verifying the stability of the grinding effect.

[0016] Explanation of beneficial effects:

[0017] 1. This invention collects data on the copper stamping and flatness of the copper strip surface, performs synchronous calibration and reverse diagnosis of roll damage, generates differentiated grinding work orders for different types of damage, and performs high-precision positioning grinding. This effectively avoids traditional full-roll surface grinding, reduces roll material consumption to extend its service life, and improves grinding accuracy and efficiency, while reducing rework.

[0018] 2. This invention ensures stable surface quality of copper strip and avoids defect recurrence through a closed-loop mechanism of real-time monitoring of the original damage location of the roll after grinding and offline sample verification. Furthermore, relying on automated data acquisition and standardized processes, it reduces reliance on manual experience, minimizes quality fluctuations caused by operational differences, and is suitable for continuous production of copper strip. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a flowchart illustrating the steps of a roll grinding management method based on the surface quality of copper strip according to the present invention. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Example 1

[0023] Please see Figure 1 The diagram shows a flowchart of the roll grinding management method based on the surface quality of copper strip according to the present invention. The specific steps include:

[0024] Step S100: Data acquisition and synchronous calibration.

[0025] An online linear scan camera is used as the acquisition device. This camera must be fixed in position with the copper strip rolling production line to ensure that the shooting angle covers the full width of the copper strip and can capture images of the strip surface in real time during the rolling process. The copper stamp position data acquired by the camera is presented in coordinate form, where the width coordinate X corresponds to the lateral position of the copper strip, that is, the linear distance from one edge of the strip to the other edge; the roll length coordinate Y corresponds to the longitudinal position of the copper strip, that is, the cumulative rolling length from the starting end of rolling to the current acquisition point. During the acquisition process, the camera needs to dynamically adjust the shooting frame rate according to the rolling speed to avoid blurry copper stamp images or missed shots due to the rapid movement of the strip.

[0026] Furthermore, a laser flatness meter was selected as the acquisition device. This device must have sufficient measurement resolution to identify minute defects on the surface of the copper strip, avoiding the omission of tiny dents or wavy lines due to insufficient accuracy; the scanning width must completely cover the actual rolling width of the copper strip to ensure that flatness features across the entire width range can be captured. The acquired flatness waveform data specifically includes three types of features: First, local dents, which are manifested as unidirectional fluctuations within a specific wavelength range on the strip surface, and the depth of the trough of the fluctuation must meet the preset surface dent defect judgment standard. This type of feature usually corresponds to local bulge damage on the roll; Second, periodic wavy lines within a preset range from the edge, which are repeated undulations with a fixed period and amplitude appearing within a specific width range of the strip edge, and the number of consecutive cycles must meet the judgment conditions for effective wavy line features. This type of feature usually corresponds to uneven wear at the edge of the roll; Third, overall undulation features, which are manifested as macroscopic flatness deviations across the entire width range of the strip, without obvious local concentration phenomena. This type of feature usually corresponds to the contour dimension deviation of the middle section of the roll.

[0027] Furthermore, since the copper stamp position data and flatness waveform data come from the line scan camera and laser flatness meter respectively, the acquisition clocks of the two types of equipment may differ, resulting in data at the same acquisition time corresponding to different rolling stages. Therefore, it is necessary to use the rolling mill PLC system to achieve synchronous calibration. First, the rolling speed and coil length count signals are acquired in real time from the PLC system. The rolling speed reflects the current movement rate of the strip, and the coil length count signal reflects the cumulative length of the rolled strip. Using the clock signal of the PLC system as a unified reference, the acquisition timestamps of the line scan camera and laser flatness meter are aligned with the PLC clock to ensure that the acquisition time of the three types of equipment is synchronized. After synchronization, the data consistency is verified by sampling. Multiple sections of rolled coil length of different lengths are selected, and their actual physical lengths are manually measured and compared with the coil length count recorded by the PLC system. The deviation value between the two is calculated. If the deviation exceeds the preset allowable range, the copper stamp coordinate Y is corrected according to the deviation ratio to eliminate the longitudinal position offset caused by the PLC counting error, and finally achieves accurate spatiotemporal matching between the copper stamp position data and the flatness waveform data.

[0028] Step S200: Roll damage diagnosis.

[0029] The width coordinate X in the copper stamping location data is directly mapped to the axial position of the roll, i.e., the linear distance from one end of the roll surface to the other, ensuring that defects in the width direction of the strip can be accurately located in a specific area along the axial direction of the roll. The length coordinate Y is converted into the rotation angle of the roll through motion correlation. Since the rolling power of the copper strip comes from the rotation of the roll, there is a fixed correlation between the longitudinal movement distance of the strip and the rotation angle of the roll. That is, the distance the strip moves forward for each rotation of the roll is the circumference of the roll (π × roll diameter). Therefore, the Y value can be converted into the rotation angle of the roll by the ratio of the rolling speed to the roll speed, thereby determining the specific location of the copper stamping defect in the circumferential direction of the roll and realizing the accurate calculation of the damage angle.

[0030] Furthermore, when local depressions appear in the flatness waveform data, it can be determined that there is convex wear on the roll. The principle is that the convex part on the roll surface will exert local pressure on the copper strip during the rolling process, resulting in a depression on the strip surface corresponding to the convex position. When periodic wavy patterns appear within a preset range from the edge, it can be determined that there is uneven wear on the roll edge. The principle is that uneven wear on the edge of the roll will cause periodic fluctuations in the rolling pressure at the edge of the strip during the rolling process, thus forming periodic wavy patterns. When overall undulation features appear, it can be determined that there is insufficient profile in the middle section of the roll. The principle is that the profile dimension deviation in the middle section of the roll will cause uneven distribution of rolling pressure across the entire width, making the strip surface exhibit a macroscopic undulation state.

[0031] Furthermore, due to potential cumulative errors in the roll length counting of the rolling mill PLC system, there is a deviation between the measured and theoretical values ​​of the copper stamp coordinate Y. Directly using this value for damage angle calculation would affect positioning accuracy, thus requiring correction. First, combining the actual roll speed read by the PLC system, the theoretical displacement equals the product of rolling speed and rolling time. Since rolling speed is the roll linear velocity (π × roll diameter × roll speed), the theoretical displacement can be directly calculated using the roll speed, diameter, and rolling time. The theoretical displacement is then compared with the measured value of the copper stamp coordinate Y. If the deviation exceeds the preset allowable range, the theoretical value is used to recalculate the damage angle, ensuring that the positioning deviation of the damage angle meets the accuracy requirements for roll damage repair. The roll diameter needs to be updated through multi-point measurements to avoid inaccurate diameter data due to roll wear. Three measurement points—the two ends and the midpoint of the roll—are selected using high-precision measuring tools. The average of the three measurement results is taken as the current actual roll diameter, ensuring the accuracy of the calculation basis.

[0032] Furthermore, the depth of roll wear damage is calculated: the degree of damage is quantified using a formula to calculate the depth of roll wear damage. The formula is: ,in, The depth of the copper stamp on the surface of the copper strip. The imprint enlargement factor is , This is a correction factor for the hardness ratio of the rolls to the copper strip. The dynamic yield strength of copper strip. The elastic modulus of the roll. The work hardening coefficient, H represents the residual thickness of the hardened layer on the roll surface, and H represents the characteristic thickness of the hardened layer on the roll. This indicates the proportion of the current residual thickness to the feature thickness. Let be the attenuation function of the hardened layer, according to The range of the ratio to H corresponds to the output attenuation coefficient. This is a fatigue repair layer.

[0033] Furthermore, the depth of copper stamping on the surface of the copper strip. Data is collected using a laser thickness gauge. This device needs to work synchronously with a linear scan camera to ensure that the collected copper stamp depth and position data correspond to the same defect; stamp enlargement coefficient. Based on the material properties of copper strip, different materials of strip have different degrees of deformation when squeezed by rolls, so it is necessary to determine the appropriate coefficient value through preliminary tests. This is a correction factor for the hardness ratio of the rolls to the copper strip, ranging from 0.8 to 2.5. The higher the hardness ratio, the better. The larger the value; the greater the dynamic yield strength of copper strip. Obtained from the material property parameter table, this parameter reflects the strip's ability to resist plastic deformation and directly affects the correlation between the copper stamping depth and the roll damage depth; the roll's elastic modulus The degree of elastic deformation during the rolling process varies depending on the material of the rolls; the work hardening coefficient... Through correlation calculation of the number of steel passes, the number of steel passes is read in real time from the rolling mill PLC system. It is automatically accumulated after each coil of copper strip is rolled. When the number reaches the system's preset saturation threshold, the work hardening coefficient no longer changes with the increase of the number of passes and remains at a constant value; the residual thickness of the hardened layer on the roll surface... This equipment can non-destructively test the actual thickness of the hardened layer on the surface of a roll using an ultrasonic thickness gauge. The characteristic thickness H of the hardened layer is the design thickness of the roll at the time of manufacture, obtained from the equipment's technical documentation. The hardened layer attenuation function... The ratio of the residual thickness of the hardened layer to its characteristic thickness is used to calculate the current state of the hardened layer. A larger ratio indicates a more intact hardened layer and a lower degree of attenuation. (Fatigue repair layer) This is a composite term in the formula, which comprehensively reflects the impact of fatigue wear on the roll due to long-term rolling on the damage depth, ensuring that the calculated roll wear damage depth can truly reflect the actual damage situation.

[0034] Step S300: Generate differentiated grinding work orders.

[0035] For wear on roll bumps, targeted intensive grinding is required. Bump wear is localized damage, so only the damaged area needs to be ground; full roll surface grinding is unnecessary to reduce material loss. The grinding feed rate needs to be linked to the copper stamping depth, as the copper stamping depth directly reflects the bump height. The feed rate must ensure complete removal of the bumps without over-grinding. Therefore, it is set to a preset proportional relationship with the copper stamping depth. This ratio needs to be determined through preliminary testing to ensure a smooth roll surface after grinding.

[0036] Furthermore, for roll edge wear, taper compensation grinding is required. Roll edge wear causes the roll edge profile to have a non-standard shape. Taper compensation can restore the standard profile of the edge, ensuring uniform pressure on the strip edge during rolling. The taper setting must be within a reasonable range suitable for wear repair, avoiding excessive or insufficient taper that could lead to new rolling defects. At the same time, an additional edge grinding amount is required to meet the edge grinding needs, because roll edge wear may be accompanied by edge burrs or minor damage. This grinding amount must be set according to the degree of edge damage to ensure that the roll edge is smooth and flat after grinding.

[0037] Furthermore, for insufficient mid-section profile, full-roll surface compensation and reshaping are required. Insufficient mid-section profile indicates an overall profile deviation of the roll, necessitating grinding of the entire roll surface to restore the standard profile. The setting of the convexity compensation amount needs to be correlated with the average value of the flatness waveform's depression, as the average depression value reflects the severity of the overall undulation of the strip, which in turn corresponds to the degree of deviation in the mid-section profile of the roll. The compensation amount must ensure complete correction of the profile deviation; therefore, it is set to a preset proportional relationship with the average depression value. This proportion needs to be determined through profile accuracy testing to ensure that the mid-section profile of the roll meets rolling standards after grinding.

[0038] Step S400: High-precision positioning and grinding.

[0039] First, a reference alignment is performed by etching a ring-shaped reference line on the end face of the roll. This reference line must have clear visual features for easy identification by the grinding machine. After etching, the roll is installed on the grinding machine, and the roll position is adjusted so that the reference line on the end face is precisely aligned with the coordinate system of the grinding machine. The coordinate system of the grinding machine is established with the center of the grinding machine spindle as the origin. The alignment of the reference line must ensure that the axial and circumferential directions of the roll are consistent with the coordinate system of the grinding machine. The alignment deviation must be controlled within the preset accuracy range to avoid the grinding position shift due to coordinate system deviation.

[0040] Furthermore, damage area locking is performed using a high-precision angle positioning device. The angle positioning accuracy of this device must meet the requirements for damage area locking, ensuring that the damage angle range of the roll can be accurately captured. Based on the damage angle calculated in step S200, the damage angle range of the roll is locked by the angle positioning device to ensure that the damage area is completely covered, while avoiding excessive expansion of the grinding range. During the locking process, the positioning accuracy of the device needs to be monitored in real time, and any deviations need to be adjusted in time.

[0041] Furthermore, a precision inspection is conducted after grinding. After grinding, the contour accuracy of key areas is checked. The inspection areas include the damaged repair area and the key working area of ​​the roll. The inspection indicators include the height difference of local protrusions and the roll edge taper error to ensure that there are no residual protrusions on the surface of the rolled after grinding. The roll edge taper error must meet the preset accuracy requirements to ensure that the roll edge contour is restored to the standard shape. If the inspection results do not meet the accuracy requirements, the grinding parameters need to be readjusted and the grinding process needs to be repeated until the accuracy meets the standard.

[0042] Step S500: Post-grinding monitoring and qualification assessment.

[0043] After the re-grinding rolls are installed on the production line, the original damaged areas need to be closely monitored, as these areas are high-risk zones for defect recurrence. Monitoring includes the depth of the copper stamp and the amplitude of the wavy lines. If the depth of the copper stamp is greater than the preset ratio of the original value before re-grinding, it indicates that the damage has not been completely repaired, and an additional re-grinding process needs to be triggered to re-grind the area. If the amplitude of the wavy lines exceeds the preset amplitude threshold, it indicates that the repair of the roll edge wear is incomplete, and the taper compensation amount needs to be increased to match the proportion of fluctuation repair, and the re-grinding parameters need to be readjusted. During the monitoring process, the monitoring data needs to be recorded in real time to form a dynamic tracking record of the re-grinding effect.

[0044] Furthermore, after the first roll of strip is produced following the grinding process, samples must be taken from the area corresponding to the original damage. The sample size must be a pre-defined fixed specification to ensure comparability of each sample. The number of samples must be no less than the pre-defined number, typically three or more, to avoid the impact of accidental errors in a single sample on the verification results. After taking the samples, the depth of the copper stamp on the sample surface must be manually checked, and the results must be compared with the online monitoring data. If the deviation exceeds the pre-defined threshold, it indicates that the online monitoring equipment may have an accuracy deviation, and the online monitoring threshold must be adjusted based on the manual detection value to ensure the accuracy of subsequent monitoring.

[0045] Furthermore, if the online monitoring data of multiple rolls of strip are all normal and the offline sample verification results meet the standards, it indicates that the performance of the refurbished rolls is stable and the refurbishment can be deemed qualified. The number of rolls in a series should be set to match the stability verification requirements of the refurbishment effect to ensure that the long-term working stability of the rolls can be fully verified. If periodic fluctuations are found in the edge wavy pattern during the inspection, even if the online monitoring amplitude does not exceed the threshold, the taper compensation amount should still be adjusted because periodic fluctuations are an early signal of defect recurrence and early intervention is necessary. During the adjustment process, the single adjustment amount should not exceed the preset ratio of the original compensation amount to avoid new rolling defects caused by excessive adjustment and to ensure that the adjustment process is stable and controllable.

[0046] Example 2

[0047] This embodiment uses an H62 brass strip cold rolling production line as the application scenario. This production line mainly rolls H62 brass strips with a thickness of 1.0-2.0mm and a width of 1200mm, and the rolls are Φ300×1500mm alloy cast iron rolls.

[0048] Step S100: Data Acquisition and Synchronization Calibration

[0049] Copper stamp position data acquisition: A line scan camera with a resolution of 2592×1944 and a frame rate of 30fps is used. It is installed 1.5m from the rolling exit side, and the lens covers the full width of the 1200mm strip. The copper stamp coordinates are acquired in real time, with the X range of 0-1200mm (corresponding to the strip width) and the Y accumulated with the rolling progress. During the acquisition process, the frame rate is adjusted to 25fps according to the rolling speed of 12m / min to avoid image blurring.

[0050] Flatness waveform data acquisition: A laser flatness meter with a measurement resolution of 0.1μm and a scanning width of 1500mm was used and installed 0.8m downstream of the camera. Three types of features were acquired: local depressions, periodic wavy lines within 80mm of the edge, and overall undulations.

[0051] Synchronous calibration: Based on PLC data, the rolling speed of 12m / min and the roll length counting signal are acquired; using the PLC clock as a reference, the timestamps of the camera and the flatness meter are aligned, with an alignment deviation of ≤10ms; five 10m long rolls are randomly inspected, and the actual measured length deviates from the PLC count by a maximum of 0.05m. The copper stamp coordinate Y is corrected according to the deviation ratio, and the Y deviation after correction is ≤0.01m, thus achieving data synchronization.

[0052] Step S200: Roll Damage Diagnosis

[0053] Damage angle calculation: X=850mm (strip width direction) corresponds to the 850mm position of the roll axis; Y=60m, rolling time=60m / (12m / min)=300s, PLC reads the roll speed as 150r / min, number of rotations=150×300 / 60=750 rotations, damage angle=750×360°+(60-750×π×0.299986) / (π×0.299986)×360°=145°.

[0054] Damage type identification: Local depressions correspond to wear of roll protrusions, edge wavy lines correspond to uneven wear of roll edges, and overall undulations that do not reach the threshold are not considered as mid-section damage.

[0055] Displacement deviation correction: Theoretical Y = 12m / min × 300s / 60 = 60m, measured Y = 60.04m, the deviation is 0.04m, which exceeds the allowable range of ±0.02m. The damage angle is recalculated using the theoretical value. After correction, the angle deviation is 0.15°, which meets the positioning accuracy.

[0056] Roll diameter measurement: The diameters at both ends of the roll were measured with a micrometer to be 299.985 mm and 299.987 mm, respectively, and the diameter at the midpoint was 299.986 mm, with an average of 299.986 mm.

[0057] Wear depth calculation: =0.3mm, =1.3 (H62 brass fit value) =2.2 (H62 brass strip has a hardness of 120HV after cold rolling, and the roll hardness is 260HV. The hardness ratio = 260 / 120≈2.17, so we take an approximate value of 2.2). =320MPa =190000MPa =0.85 Number of steel passes: 85 coils (not exceeding the threshold of 100 coils). =3.2mm (measured with an ultrasonic thickness gauge), H=5mm (factory parameters). , .

[0058] Step S300: Generate Differentiated Grinding Work Order

[0059] Wear of protrusions: fixed-point grinding, feed rate 1.2×0.121mm=0.145mm, range is 1100mm±6mm axial and 165°±4° circumferential.

[0060] Roller edge wear: Taper compensation of 0.35°, additional edge grinding amount of 0.03mm, covering a range of 120mm around the roller edge.

[0061] Step S400: High-precision positioning and grinding

[0062] The roller end face is engraved with a reference line and aligned with the grinding machine coordinate system (deviation 0.005mm); the damage range of 165°±4° is locked with a photoelectric encoder, and the laser profilometer is used for spot checks after grinding: the difference in convex point height is 0.002mm and the roller edge taper error is 0.013°, both of which meet the standards.

[0063] Step S500: Post-grinding monitoring and acceptance criteria

[0064] Online monitoring thresholds: copper stamping depth 0.09mm, wavy amplitude 0.02mm, and data from 3 consecutive rolls of strip remain stable within the thresholds.

[0065] Five 120mm×120mm samples were cut from the first roll. The average value of the copper stamp was manually inspected and found to be 0.068mm, which was 0.004mm different from the online data. After five consecutive rolls with no abnormalities, the defect rate of the subsequent strip material dropped to 1.2%, and the grinding was deemed qualified.

[0066] The above description is merely an embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of the claims of this application.

Claims

1. A roll grinding management method based on copper strip surface quality, characterized by, The method comprises the following steps: Collecting surface copper mark defect position data and flatness waveform data of the copper strip after rolling, and synchronously calibrating copper mark defect position coordinates (X, Y) and waveform data by using rolling speed and winding length counting signals obtained by a rolling mill PLC system in real time; Roller damage reverse diagnosis, calculating roller damage angle according to the copper mark defect position coordinates, identifying roller damage type by combining the flatness waveform data, wherein local concave is roller convex wear, edge wave is roller edge wear, and overall fluctuation is middle section profile deficiency; calculating theoretical winding length direction displacement by combining actual roller speed, comparing measured value and theoretical value of copper mark coordinate Y, recalculating damage angle by using theoretical value when deviation exceeds preset range, and updating roller diameter by averaging multiple point measurement values; Generating differentiated grinding work order, performing fixed point intensive grinding for convex wear, implementing adaptive taper compensation grinding for roller edge wear, and performing full roller surface compensation remodeling for middle section profile deficiency; High-precision positioning grinding, marking reference line on roller end face and aligning with grinder coordinate system by using angle positioning device to lock damage angle interval; after grinding, sampling key area profile precision by using laser profile instrument to ensure that convex height difference and roller edge taper error meet the standard; When the ground roller returns to the production line, real-time monitoring and sample review are performed on the original damage position, and dynamic additional grinding or adjustment of compensation amount is performed according to the monitoring result, and if there is no abnormality in continuous multiple copper strips, the roller grinding is determined to be qualified.

2. The roll grinding management method based on copper strip surface quality according to claim 1, characterized by, The copper mark defect position data includes width direction coordinate X and winding length direction coordinate Y, and the flatness waveform data includes local concave, periodic wave within a preset interval from the edge, and overall fluctuation characteristics.

3. The roll grinding management method based on copper strip surface quality according to claim 1, characterized by, The reverse diagnosis of the roll damage further comprises calculating the roll wear damage depth by a formula , the formula is , wherein, is the copper printing depth of the copper strip surface, is a printing mark expansion coefficient, is a roll and copper strip hardness ratio correction coefficient, is the dynamic yield strength of the copper strip, is the elastic modulus of the roll, is a work hardening coefficient, the calculation mode is a logarithmic function correlation calculation based on the number of steel passes, the number of steel passes is read from the rolling mill PLC and is automatically accumulated every time a roll is produced, when the number of steel passes exceeds the preset number of times threshold, a constant value is taken; is the residual thickness of the roll surface hardened layer, H is the characteristic thickness of the roll hardened layer, indicates the proportion of the current residual thickness to the characteristic thickness, is a hardened layer attenuation function, according to the ratio of the interval where H is located, the attenuation coefficient of the corresponding range is output; is a fatigue trimming layer.

4. The roll grinding management method based on the surface quality of copper strip based on claim 1, characterized by, The laser flatness instrument is used to measure the surface defects of the copper strip, the laser flatness instrument meets the scanning width covering the full width of the copper strip, the local concave is unidirectional fluctuation in a specific wavelength range, and the wave trough depth reaches the determination threshold of surface concave defects, and the edge wave is periodic fluctuation within a specific interval from the edge of the strip, with specific period and amplitude, and the number of continuous periods meets the determination condition of effective wave characteristics.

5. The roll grinding management method based on the surface quality of copper strip according to claim 1, characterized in that, In the synchronous calibration process of the copper mark position and flatness data, the copper mark coordinate Y is corrected by sampling the deviation between the actual length of multiple winding lengths and the PLC counting winding length.

6. The roll grinding management method based on the surface quality of copper strip based on claim 1, characterized by, The multiple point measurement of the roller diameter specifically comprises measuring the roller diameter at three positions, i.e., two ends and a midpoint of the roller by using a micrometer, and taking the average value of the measurement results as the diameter of the roller.

7. The roll grinding management method based on the surface quality of copper strip based on claim 1, characterized by, When the ground roller returns to the production line, the steps of monitoring and sample review on the original damage corresponding position comprise: if the copper mark depth is greater than a preset proportion of the original value before grinding, additional grinding is performed; if the wave amplitude exceeds a preset amplitude threshold, the taper compensation amount is increased to a proportion suitable for wave repair; and if there is no abnormality in continuous multiple strips, the grinding is determined to be qualified. After the first roll of the strip production is completed after grinding, samples are taken in the corresponding area of the original damage, the surface copper print depth is detected and compared with the monitoring data, and if the deviation exceeds the preset threshold, the manual detection value is used as the reference to adjust the monitoring threshold; if the periodic fluctuation of the edge wave pattern is found during the inspection, even if the online monitoring amplitude does not exceed the threshold, the taper compensation adjustment is still triggered, and the single adjustment amount does not exceed the preset proportion of the original compensation amount; The sample size taken during manual detection is a preset fixed specification, and the sample quantity is not less than 3, and the mean value of the detection results of multiple samples is compared with the online monitoring data; the number of continuous multiple rolls of strip is set to adapt to the stability verification of the grinding effect.

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