A steel bar production quality monitoring method based on an intelligent sensing system

Abstract

This invention discloses a method for monitoring the production quality of steel bars based on an intelligent sensing system, relating to the field of steel testing technology. The method includes: collecting steel bar identification, shearing displacement, and shearing pressure at a fixed-length shearing station; using one shearing action as the recording unit, writing segmented data of the tail end face of the previous steel bar, the head end face of the subsequent steel bar, and the shearing pressure into the same shearing record, and establishing an end-face index relationship between the head and tail end faces of the same steel bar; after shearing, reading the eddy current phase data of the two end faces, dividing the end faces into end-face reading areas, and performing opposite position pairing readings according to the cutting direction, conveying direction, and end-face observation direction; identifying pairing anomalies based on the end-face pairing reading data and the segmented shearing pressure data, reading the other end face of the same steel bar for cross-shear confirmation, and generating material anomaly judgment data and shearing interference judgment data; generating handling prompts based on the two types of judgment data, achieving online internal quality monitoring without additional sample cutting.

Description

Technical Field

[0001] This invention relates to the field of steel testing technology, and in particular to a method for monitoring the production quality of steel bars based on an intelligent sensing system. Background Technology

[0002] Steel bar production typically includes rolling, cooling, straightening, length shearing, and incoming inspection. Quality monitoring mainly focuses on surface cracks, inclusions, segregation, porosity, and end defects. Conventional steel bar production quality monitoring methods often employ eddy current testing, ultrasonic testing, magnetic particle testing, visual inspection, and sampling low-magnification inspection to examine the outer surface, internal continuity, and end condition of the steel bars. The test data is then correlated with production information such as the steel bar's furnace number, specifications, and batch number for production release, re-inspection, and quality traceability.

[0003] Conventional steel bar quality monitoring methods mostly rely on the inspection data of the outer surface of the steel bar or a single end face as the basis for judgment. On the one hand, the newly formed end face formed by shearing is not fully used as an online inspection surface for the internal material state of the steel bar, and anomalies in the central area and ring area are difficult to be promptly addressed in production. On the other hand, tool scratches, burrs, water stains and oxide scale on the sheared end face are easily confused with material anomalies, and continuous anomalies lack cross-shear confirmation basis. Summary of the Invention

[0004] To address the problems of misjudgment of material anomalies at the shearing end face due to shearing interference and insufficient reliability in confirming continuous material anomalies in existing technologies, this invention provides a steel bar production quality monitoring method based on an intelligent sensing system. The method includes: collecting steel bar identification, shearing displacement, and shearing pressure at the steel bar length-cutting station; using one shearing action as the shearing record unit; writing segmented data of the previous steel bar tail end face formed by the front side of the shearing cutter, the subsequent steel bar head end face formed by the rear side of the shearing cutter, and the shearing pressure into the same shearing record; and establishing an end face index relationship between the same steel bar head end face and tail end face; after shearing, reading the eddy current phase data of the previous steel bar tail end face and the subsequent steel bar head end face, and dividing the two end faces into middle and lower sections. The system analyzes the core region, intermediate ring region, and outer ring region. Based on the cutting direction of the shearing tool, the steel bar conveying direction, and the end face observation direction, it pairs and reads the end face region of the tail end face of the previous steel bar with the opposite end face region of the head end face of the next steel bar, forming end face pairing reading data. Based on the end face pairing reading data and shear pressure segmentation data, it identifies whether there is a pairing anomaly between the two end faces formed in the same shearing. It also reads the end face data of the other end face of the same steel bar according to the end face index relationship, confirms the pairing anomaly across shearing, and generates steel bar material anomaly judgment data and shear interference judgment data. The steel bar material anomaly judgment data and shear interference judgment data are written into the quality monitoring table, and steel bar production handling prompts are generated based on the quality monitoring table.

[0005] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the shear pressure segmentation data includes: determining the start time and complete shearing position of a shearing action based on shear displacement data; dividing a shearing action into an entry segment, a middle shear segment, and an exit segment according to the displacement range of the shearing tool relative to the steel bar cross section; reading the pressure change pattern of the shearing pressure with shear displacement in the entry segment, the middle shear segment, and the exit segment respectively; and writing the pressure change pattern of the entry segment, the middle shear segment, and the exit segment into the same shearing record.

[0006] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the step of establishing the end-face index relationship of the same steel bar's head and tail ends includes: establishing a steel bar end-face index table; during continuous fixed-length shearing, writing the shearing record number of the head end and the shearing record number of the tail end of the same steel bar into the same steel bar end-face index record; when the shearing record of the other end of the same steel bar has not yet been formed, writing the corresponding steel bar into the end-face pending confirmation record; the steel bar end-face index table includes the steel bar furnace number, steel grade, specification, rolling batch, fixed-length number, shearing record number of the head end and the shearing record number of the tail end.

[0007] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the specific steps of dividing the two end faces into a central region, an intermediate ring region, and an outer ring region are as follows: establishing end face planar coordinates based on the scanning position of the end face eddy current detection head; dividing the tail end face of the preceding steel bar and the head end face of the following steel bar into a central region, an intermediate ring region, and an outer ring region based on the geometric center and the steel bar radius, and acquiring eddy current phase data; the end face planar coordinates take the geometric center of the steel bar end face as the origin, the shearing tool entry direction as the first coordinate direction, and the end face direction perpendicular to the shearing tool entry direction as the second coordinate direction.

[0008] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the acquisition of eddy current phase data includes: dividing the intermediate ring area and the outer ring area into multiple sectors according to the shearing tool entry side, shearing tool exit side, steel bar support side, and steel bar free side, and reading the eddy current phase data of each sector respectively; when there are multiple eddy current phase sampling points in the same end face reading area, the median of the multiple eddy current phase sampling points is read as the eddy current phase data of the end face reading area.

[0009] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the step of forming end-face pairing and reading data includes: determining the opposite position pairing relationship between the tail end face of the preceding steel bar and the head end face of the following steel bar according to the cutting direction of the shearing tool, the steel bar conveying direction, and the end-face observation direction; pairing the cutting-side region of the tail end face of the preceding steel bar with the cutting-off region of the head end face of the following steel bar, pairing the cutting-off region of the tail end face of the preceding steel bar with the cutting-side region of the head end face of the following steel bar, and pairing the central region of the tail end face of the preceding steel bar with the central region of the head end face of the following steel bar, thereby forming central region pairing data, intermediate ring region pairing data, and outer ring region pairing data.

[0010] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the step of identifying whether there is a pairing anomaly between two end faces formed in the same shearing includes: when the phase difference between the end face reading area and the adjacent end face reading area is greater than the area phase difference limit, the end face reading area is recorded as a phase anomaly area; when the end face areas of the tail end face of the preceding steel bar and the head end face of the following steel bar are both phase anomaly areas, it is determined that there is a pairing anomaly between the two end faces formed in the same shearing.

[0011] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the pairing anomalies include: central region pairing anomalies, intermediate ring region pairing anomalies, and outer ring region pairing anomalies. A central region pairing anomaly is formed when both the central region of the tail end face of the preceding steel bar and the central region of the head end face of the following steel bar in the central region pairing data are phase-abnormal regions. An intermediate ring region pairing anomaly is formed when both the intermediate ring region sector of the tail end face of the preceding steel bar and the intermediate ring region sector of the head end face of the following steel bar in the intermediate ring region pairing data are phase-abnormal regions, and neither the central region of the tail end face of the preceding steel bar nor the central region of the head end face of the following steel bar is a phase-abnormal region. An outer ring region pairing anomaly is formed when both the outer ring region sector of the tail end face of the preceding steel bar and the outer ring region sector of the head end face of the following steel bar in the outer ring region pairing data are phase-abnormal regions.

[0012] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the cross-shear confirmation includes: when there is a pairing anomaly in the central region and there are no more than two pressure rise segments arranged in shear displacement order in the pressure change pattern of the middle shear segment, reading the central region data of the other end face of the same steel bar according to the end face index relationship; if the shear record of the other end face of the same steel bar has not yet been formed, a central inclusion to be confirmed record is generated; if the central region of the other end face of the same steel bar is still a phase anomaly region, a central inclusion risk steel bar is generated; if the central region of the other end face of the same steel bar is not a phase anomaly region, a central inclusion risk steel bar is generated. The current shear end face local anomaly record; when the phase anomaly area in the intermediate ring region does not satisfy the paired reading relationship between the tail end face of the previous steel bar and the head end face of the next steel bar, but appears continuously along adjacent sectors within the same end face, the intermediate ring region data of the other end face of the same steel bar is read according to the end face index relationship; if the shear record of the other end face of the same steel bar has not yet been formed, a record of tissue inhomogeneity pending confirmation is generated; if the intermediate ring region of the other end face of the same steel bar again shows a continuous adjacent sector phase anomaly area, a steel bar with tissue inhomogeneity risk is generated; if the intermediate ring region of the other end face of the same steel bar does not show a continuous adjacent sector phase anomaly area again, a record of local interference on the end face is generated.

[0013] As a preferred embodiment of the steel bar production quality monitoring method based on an intelligent sensing system described in this invention, the generation of steel bar material anomaly judgment data and shear interference judgment data includes: generating a central loosening risk segment when there is a pairing anomaly in the central region, and the pressure change pattern of the middle shear segment contains two or more pressure rise segments arranged in shear displacement order and there is a pressure fall segment between adjacent pressure rise segments; generating a segregation zone risk segment when there is a pairing anomaly in the middle ring region; and generating a segregation zone risk segment when there is a pairing anomaly in the outer ring region, and the pressure change pattern of the entry segment does not show that the shear pressure first rises and then falls back to the middle shear segment. The range of pressure change patterns in the segment, and when the pressure change pattern in the off-edge segment does not show a pressure increase segment before the shear pressure decreases, or a pressure decrease segment after the pressure increase segment, a surface folding risk segment is generated; the central loose risk segment, the central inclusion unconfirmed record, the central inclusion risk steel bar, the segregation zone risk segment, the microstructure unevenness unconfirmed record, the microstructure unevenness risk steel bar, and the surface folding risk segment are written into the steel bar material anomaly judgment data; the current shear end face local anomaly record, end face local interference record, the previous steel bar tail end face tool scratch record, and the subsequent steel bar head end face burr record are written into the shearing interference judgment data.

[0014] The beneficial effects of this invention are as follows: by using the newly formed end face of fixed-length shearing as the material condition detection surface of the steel bar, online monitoring of the internal quality of the steel bar is realized without additional cutting; by pairing the reading areas of the opposite end face of the previous steel bar tail end face and the end face of the next steel bar head end face formed in the same shearing, the distinction between material abnormalities and shearing interferences such as tool scratches and end face burrs is realized; by establishing the end face index relationship of the same steel bar head end face and tail end face and performing cross-shear confirmation, reliable judgment of continuous material abnormalities such as central inclusions and uneven structure is realized. Attached Figure Description

[0015] Figure 1 This is a flowchart of a method for monitoring the production quality of steel bars based on an intelligent sensing system.

[0016] Figure 2 This is a schematic diagram of the cut record and the end face index.

[0017] Figure 3 This is a schematic diagram for reading the paired end face of a newborn.

[0018] Figure 4 This is a schematic diagram for determining material anomalies and shear interference.

[0019] Figure 5 This is a comparative data chart showing the false alarm rate of shearing interference.

[0020] Figure 6 This is a comparative data chart showing the consistency rate of material anomaly verification. Detailed Implementation

[0021] Reference Figures 1-6 This is one embodiment of the present invention, which provides a method for monitoring the production quality of steel bars based on an intelligent sensing system, comprising the following steps:

[0022] S1. Collect the steel bar identification, shearing displacement and shearing pressure at the steel bar length shearing station. Take one shearing action as the shearing record unit. Write the segmented data of the previous steel bar tail end face formed by the front side of the shearing tool, the next steel bar head end face formed by the rear side of the shearing tool and the shearing pressure into the same shearing record, and establish the end face index relationship of the same steel bar head end face and tail end face.

[0023] A steel bar code reader, a shearing displacement sensor, a shearing pressure sensor, an end-face eddy current detection head, an end-face thermal sensor, and an edge processing unit are installed at the steel bar length shearing station.

[0024] The steel bar code reader is installed on the feeding side of the fixed-length shearing station to read the steel bar furnace number, steel grade, specification, rolling batch, fixed-length number and steel bar conveying sequence before the steel bar enters the shearing area.

[0025] The shear displacement sensor is installed in the shearing tool drive mechanism to read the shear displacement data of the shearing tool from contacting the steel bar to completing the shearing.

[0026] The shear pressure sensor is installed at the shearing cutter drive mechanism or the pressure output end of the shearing machine to read the shear pressure data of the shearing cutter during the shearing process.

[0027] The end-face eddy current detection head is set at the end-face detection position between the discharge side and the feed side of the shearing station. It is used to read the end-face eddy current phase data of the tail end face of the previous steel bar and the head end face of the next steel bar after shearing.

[0028] The end-face thermal sensor is located adjacent to the end-face eddy current detection head and is used to read the end-face temperature data of the tail end face of the preceding steel bar and the head end face of the following steel bar.

[0029] The edge processing unit communicates with the steel bar code reader, shear displacement sensor, shear pressure sensor, end face eddy current detection head, and end face thermal sensor to generate shear records, shear pressure segmentation data, and steel bar end face index table.

[0030] The steel bar markings include the steel bar furnace number, steel grade, specifications, rolling batch, length number, and steel bar conveying sequence.

[0031] It should be noted that the steel bar furnace number is used to distinguish different smelting furnaces; the steel grade is used to distinguish the steel bar material grade; the specification is used to indicate the steel bar diameter and fixed length; the rolling batch is used to distinguish the rolling production batch under the same furnace number; the fixed length number is used to distinguish different fixed length steel bars under the same rolling batch; and the steel bar conveying sequence is used to determine the relative position of the previous steel bar and the next steel bar in the shearing station.

[0032] Furthermore, one shearing motion is taken as a shearing record unit.

[0033] One shearing action begins when the shearing blade first contacts the steel bar and ends when the shearing blade reaches the position of complete shearing.

[0034] Within a single shearing action, the steel bar identifier, shearing displacement data, and shearing pressure data are read simultaneously, and the tail end face of the previous steel bar formed on the front side of the shearing cutter, the head end face of the next steel bar formed on the rear side of the shearing cutter, the shearing displacement data, and the shearing pressure data are written into the same shearing record.

[0035] When the shear displacement data has not reached the complete shear position, the current shear record is marked as a shear incomplete record, and the end face eddy current phase data and end face temperature data are not read.

[0036] It should be noted that the complete shearing position is obtained by the idle stroke position of the shearing tool, the diameter of the steel bar, and the closed position of the shearing tool, with a value range of 1.05 to 1.30 times the diameter of the steel bar. If the shearing is not completed, it needs to be re-sheared for confirmation. If the complete shearing position is still not reached after re-shearing, the closed state of the shearing tool and the shearing drive mechanism should be manually checked.

[0037] Furthermore, based on the shear displacement data, a single shearing action is divided into the entry segment, the middle shear segment, and the exit segment.

[0038] The entry section is the displacement range from when the shearing tool first contacts the steel bar to when the shearing tool enters the outer edge of the steel bar; the middle shear section is the displacement range of the shearing tool passing through the main body of the steel bar cross section; and the exit section is the displacement range of the shearing tool leaving the main body of the steel bar cross section until the shearing is completed.

[0039] Data on the variation of shear pressure with shear displacement is read within the entry section, within the intermediate shear section, and within the exit section, and segmented shear pressure data is generated.

[0040] The segmented shear pressure data includes the pressure change patterns in the entry section, the middle section, and the exit section.

[0041] Furthermore, an index table of steel bar end faces is established.

[0042] The steel bar end face index table includes the steel bar furnace number, steel grade, specifications, rolling batch, length number, shearing record number of the head end face, and shearing record number of the tail end face.

[0043] During continuous fixed-length shearing, the head end face of the same steel bar is formed by the previous shearing action, and the tail end face of the same steel bar is formed by the subsequent shearing action.

[0044] Based on the steel bar conveying sequence and length number, the shearing record number of the head end face and the shearing record number of the tail end face of the same steel bar are written into the same steel bar end face index record.

[0045] When the current shearing record has already formed the tail end face data of the previous steel bar, and the shearing record containing the head end face of the same steel bar already exists, the head end face data of the same steel bar is read according to the steel bar end face index table for subsequent cross-shearing confirmation.

[0046] If the current shearing record has already formed the data of the head end face of the next steel bar, but the shearing record of the tail end face of the same steel bar has not yet been formed, the next steel bar is written into the end face pending confirmation record, and reading continues after the shearing record of the tail end face of the next steel bar is formed.

[0047] Furthermore, the cutting direction of the shearing tool, the conveying direction of the steel bar, and the installation and observation direction of the end face eddy current detection head are read and written into the shearing record.

[0048] It should be noted that the shearing tool's entry direction is used to subsequently determine the entry side and exit side; the steel bar conveying direction is used to subsequently determine the tail end face of the previous steel bar and the head end face of the next steel bar; the installation and observation direction of the end face eddy current detection head is used to subsequently determine the opposite end face areas of the two newly formed end faces, which can also be called the end face observation direction.

[0049] In a preferred embodiment, the sampling frequency of the shear displacement sensor is not lower than the sampling frequency of the shear pressure sensor, and the shear displacement data and shear pressure data are written into the shear record at the same sampling time; when the sampling frequency of the shear displacement sensor is higher than the sampling frequency of the shear pressure sensor, adjacent shear displacement sampling values ​​are read according to the shear pressure sampling time, and the closest value in time among the adjacent shear displacement sampling values ​​is used as the shear displacement data at the shear pressure sampling time.

[0050] S2. After shearing, read the eddy current phase data of the tail end face of the previous steel bar and the head end face of the next steel bar. Divide the two end faces into the central region, the middle ring region and the outer ring region respectively. According to the cutting direction of the shearing tool, the steel bar conveying direction and the end face observation direction, pair the end face region of the tail end face of the previous steel bar with the opposite end face region of the head end face of the next steel bar to form end face pair reading data.

[0051] Further, read the cut record.

[0052] The shearing record includes the tail end face of the previous steel bar, the head end face of the next steel bar, the cutting direction of the shearing tool, the steel bar conveying direction, the installation and observation direction of the end face eddy current detection head, the segmented shearing pressure data, and the steel bar end face index table.

[0053] When the shearing record is not marked as an incomplete shearing record, the control end face eddy current detection head reads the end face eddy current phase data of the tail end face of the previous steel bar and the end face eddy current phase data of the head end face of the next steel bar, and controls the end face thermal sensor to read the end face temperature data of the tail end face of the previous steel bar and the end face temperature data of the head end face of the next steel bar.

[0054] Among them, the end face eddy current detection head and the end face thermal sensor read the newly formed end face after shearing.

[0055] When the time interval between the completion of shearing and the start of end-face data acquisition is greater than the end-face acquisition time limit, the shear pressure segment data is retained, the current shearing record is written into the end-face data missing record, and the current end-face eddy current phase data is not used for material anomaly judgment.

[0056] It should be noted that the end face acquisition time limit is obtained through delayed acquisition calibration after shearing qualified steel bars of the same grade and specification. Specifically, the moment when the shear displacement data reaches the completely sheared position is taken as the end face formation time. The end face eddy current phase data and end face temperature data are continuously read. When the end face eddy current phase data shows a continuous unidirectional drift and the end face temperature data decreases synchronously, the oxidation effect start time is read. The oxidation effect start time is subtracted from the time required for the end face eddy current detection head to complete one end face reading, and this is taken as the end face acquisition time limit. The value range of the end face acquisition time limit is 0.5s to 5s.

[0057] Furthermore, the end-face plane coordinates are established based on the scanning position of the end-face eddy current detection head.

[0058] The end face plane coordinates take the geometric center of the steel bar end face as the origin, the cutting direction of the shearing tool as the first coordinate direction, and the end face direction perpendicular to the cutting direction of the shearing tool as the second coordinate direction.

[0059] Furthermore, the geometric center of the end face of the steel bar is obtained.

[0060] Specifically, the outer edge contour points within the scanning range of the end face eddy current detection head are read, and the outer edge contour points are fitted to the outer edge circle of the end face. The center of the outer edge circle of the end face is read as the geometric center of the steel bar end face. When there are local missing outer edge contour points, the diameter of the steel bar in the steel bar specification is read, and the center of the arc that can cover the missing outer edge contour points is used as the geometric center of the steel bar end face.

[0061] Based on the geometric center of the steel bar end face and the steel bar radius, the tail end face of the previous steel bar and the head end face of the next steel bar are respectively divided into the central region, the intermediate ring region, and the outer ring region.

[0062] The central region is the end face region whose distance from the geometric center is no greater than the radius of the central region; the middle ring region is the end face region whose distance from the geometric center is greater than the radius of the central region but not greater than the outer radius of the middle ring region; and the outer ring region is the end face region whose distance from the geometric center is greater than the outer radius of the middle ring region but not greater than the radius of the steel bar.

[0063] It should be noted that the proportions of the central region and the intermediate ring region were obtained through end-face calibration data of steel bars of the same grade and specification. Specifically, eddy current readings were performed on the shear end-face of steel bar samples that had undergone low-magnification microstructure examination or metallographic verification. The positions of the outer boundaries of the loose central region and the central inclusions in the radial direction of the end face were recorded, and the ratio of the outer boundary position to the steel bar radius was used as the candidate proportion of the central region. The positions of the outer boundaries of the segregation bands in the radial direction of the end face were recorded, and the ratio of the outer boundary position to the steel bar radius was used as the candidate proportion of the intermediate ring region. After removing samples with missing end-face data, water marks, or oxide scale, the candidate proportions of the central region and the intermediate ring region were sorted from smallest to largest. The proportions of adjacent candidate values ​​that changed gradually after sorting were read and used as the proportions of the central region and the intermediate ring region. The value range of the central region proportion was 0.20 to 0.40, and the value range of the intermediate ring region proportion was 0.60 to 0.80.

[0064] Both the intermediate ring area and the outer ring area are divided into four sectors according to the shearing tool entry side, the shearing tool exit side, the steel bar support side, and the steel bar free side.

[0065] The shearing cutter entry side is the side where the shearing cutter first contacts the outer edge of the steel bar; the shearing cutter exit side is the side where the shearing cutter last leaves the outer edge of the steel bar; the steel bar support side is the side closest to the lower support during the shearing process; the steel bar free side is the side furthest from the lower support during the shearing process.

[0066] Furthermore, the end-face eddy current phase data of the center region, the four sectors of the middle ring region, and the four sectors of the outer ring region of the tail end face of the preceding steel bar are read respectively, and the end-face eddy current phase data of the center region, the four sectors of the middle ring region, and the four sectors of the outer ring region of the head end face of the following steel bar are read respectively.

[0067] When there are multiple end-face eddy current phase sampling points in the same end-face reading area, the end-face eddy current phase sampling points are arranged in order of their position in the end-face reading area, and the median of the end-face eddy current phase sampling points is read as the eddy current phase data of the end-face reading area.

[0068] When the difference between the average temperature of the end face reading area and the average temperature of the adjacent end face reading areas is greater than the shading temperature difference limit, and the eddy current phase data of the end face reading area is continuously missing, the end face reading area is determined to be obstructed by water or oxide scale.

[0069] It should be noted that the shading temperature difference limit is obtained by calibration of the unshading end face of qualified steel bars of the same grade and specification. Specifically, after shearing, the end face is free of water and oxide scale, and the temperature data of each end face reading area is continuously collected. The temperature difference between adjacent end face reading areas is calculated. After removing the uneven cooling area at the end face edge and the area not covered by the end face eddy current detection head, the temperature difference value that is close to the upper limit and is continuous and stable in the remaining temperature difference distribution is read as the shading temperature difference limit. The value range of the shading temperature difference limit is 10℃ to 60℃.

[0070] It should be noted that the shielding temperature difference limit is obtained by calibration of the unshielded end face of qualified steel bars of the same grade and specification. Specifically, under the condition that there is no water stains or oxide scale adhering to the end face after shearing, the temperature data of each end face reading area is continuously collected, the temperature difference between adjacent end face reading areas is calculated, and after removing the uneven cooling area at the end face edge and the area not covered by the end face eddy current detection head, the high-side stable value in the remaining temperature difference distribution is read as the shielding temperature difference limit. The value range of the shielding temperature difference limit is 10℃ to 60℃.

[0071] When the end-face temperature data indicates that there is water or oxide scale obstruction in a certain end-face reading area, and the eddy current phase data of the end-face reading area is continuously missing, the current shear record is written into the end-face data missing record, and the shear pressure segment data is retained.

[0072] Furthermore, based on the shearing tool entry direction, steel bar conveying direction, and end-face eddy current detection head installation and observation direction in the shearing record, a pairing reading relationship between the tail end face of the previous steel bar and the head end face of the next steel bar is established.

[0073] Specifically, the tail end face of the preceding steel bar and the head end face of the following steel bar are located on opposite sides of the same shearing plane, and the observation directions of the two end faces are opposite. Therefore, the cutting edge side sector of the tail end face of the preceding steel bar is paired with the cutting edge side sector of the head end face of the following steel bar for reading; the cutting edge side sector of the tail end face of the preceding steel bar is paired with the cutting edge side sector of the head end face of the following steel bar for reading; the support side sector of the tail end face of the preceding steel bar is paired with the support side sector of the head end face of the following steel bar for reading; the free side sector of the tail end face of the preceding steel bar is paired with the free side sector of the head end face of the following steel bar for reading; and the central region of the tail end face of the preceding steel bar is paired with the central region of the head end face of the following steel bar for reading.

[0074] Write the eddy current phase data of each end face reading area of ​​the tail end face of the previous steel bar and the eddy current phase data of the opposite end face reading area of ​​the head end face of the next steel bar into the same end face paired reading data.

[0075] The end-face pairing data reading includes central area pairing data, middle ring area pairing data, and outer ring area pairing data.

[0076] The central region pairing data includes eddy current phase data of the central region of the tail end face of the preceding steel bar and eddy current phase data of the central region of the head end face of the following steel bar.

[0077] The pairing data for the intermediate ring region includes the eddy current phase data of each sector of the intermediate ring region on the tail end face of the preceding steel bar and the eddy current phase data of the sector of the intermediate ring region at the opposite position on the head end face of the following steel bar.

[0078] Among them, the outer ring region pairing data includes the eddy current phase data of each sector of the outer ring region of the tail end face of the preceding steel bar and the eddy current phase data of the sector of the outer ring region at the opposite position of the head end face of the following steel bar.

[0079] In a preferred embodiment, the end face pairing read data, shear pressure segment data, and steel bar end face index table are written together into the data area to be judged in the current shearing record.

[0080] S3. Based on the end face pairing data and shear pressure segmentation data, identify whether there is a pairing anomaly between the two end faces formed by the same shearing, and read the end face data of the other end face of the same steel bar according to the end face index relationship. Confirm the pairing anomaly across shearing, and generate steel bar material anomaly judgment data and shear interference judgment data.

[0081] Furthermore, phase anomalous regions are first identified within the same end face.

[0082] The reading areas of adjacent end faces are determined according to the plane coordinates of the end faces. The central area is adjacent to the entry side sector, the exit side sector, the steel bar support side sector, and the free side sector of the middle ring area, respectively. Each sector of the middle ring area is adjacent to the sector of the outer ring area in the same orientation. Two sectors that are circumferentially connected in the middle ring area are adjacent. Two sectors that are circumferentially connected in the outer ring area are adjacent.

[0083] Read the eddy current phase data of each end face reading area and read the eddy current phase data of the adjacent end face reading areas; when the phase difference between the eddy current phase data of the end face reading area and the eddy current phase data of the adjacent end face reading area is greater than the area phase difference limit, the end face reading area is recorded as a phase abnormal area.

[0084] It should be noted that the regional phase difference limit is obtained through the calibration data of the shear end face of qualified steel bars of the same grade and specification. Specifically, on the end face of qualified steel bars with no water marks, no oxide scale, no surface folds and no central defects, eddy current phase data is collected according to the end face reading area division method. The phase difference between adjacent end face reading areas is calculated. After removing missing end face data records and local interference records, the high-side stable value in the remaining phase difference distribution is read as the regional phase difference limit. The value range of the regional phase difference limit is 1.5 to 3.5 times the upper limit of the eddy current phase difference between adjacent reading areas of the qualified steel bar end face.

[0085] For the paired data in the central region, read the central region of the tail end face of the previous steel bar and the central region of the head end face of the next steel bar.

[0086] When both the central region of the tail end face of the preceding steel bar and the central region of the head end face of the following steel bar are phase abnormal regions, and there are two or more pressure rise segments arranged in the order of shear displacement in the pressure change pattern of the middle shear section, and there is a pressure fall segment between adjacent pressure rise segments, the steel bar segment formed by the extension of the risk segment from the tail end face of the preceding steel bar into the steel bar is recorded as the tail segment of the preceding steel bar, and the steel bar segment formed by the extension of the risk segment from the head end face of the following steel bar into the steel bar is recorded as the head segment of the following steel bar. The tail segment of the preceding steel bar and the head segment of the following steel bar are written into the central loosening risk segment.

[0087] It should be noted that the risk section length is obtained through the center porosity verification record of steel bars of the same grade and specification. Specifically, for steel bar samples that have been confirmed to have center porosity by low-magnification microstructure examination, verification samples are continuously cut along the length of the steel bar starting from the shear end face. The position of the last occurrence of center porosity in the continuous verification samples is recorded. After removing samples with incomplete shearing, missing end face data, and local interference at the end face, the last occurrence position of center porosity is converted into the extension length of the end face into the inside of the steel bar. Combined with the minimum cut length in the company's end cut specifications, the larger of the two lengths is taken as the risk section length. The value range of the risk section length is 1 to 5 times the diameter of the steel bar.

[0088] It should be noted that the presence of two or more pressure rise segments arranged in order of shear displacement is chosen because central porosity will cause the shearing tool to encounter multiple local uneven load locations when passing through the central area of ​​the steel bar, resulting in the shear pressure curve showing multiple rises and falls; a single pressure rise segment is more likely to be caused by tool entry, local burrs, or instantaneous sampling fluctuations, and should not be directly used as a basis for judging central porosity.

[0089] The pressure rise segment is the sampling segment where the shear pressure continuously increases with the shear displacement, and the pressure fall segment is the sampling segment where the shear pressure continuously decreases with the shear displacement.

[0090] Among them, the pressure change pattern in the middle shear section is used to determine whether there is a discontinuous pressure change process in the local bearing of the material when the shearing tool passes through the main body of the steel bar section, and the pairing anomaly in the central region is used to indicate that there is a change in eddy current phase in the central region on both sides of the same shear plane. The two data are used together to determine the central loose risk section.

[0091] If the central region of the tail end face of the current steel bar and the central region of the head end face of the next steel bar are both phase abnormal regions, and there are no more than two pressure rise segments arranged in order of shear displacement in the pressure change pattern of the middle shear section, the central loosening risk segment is not directly written. Instead, the central region data of the other end face of the same steel bar is read according to the steel bar end face index table.

[0092] When the shear record of the other end face of the same steel bar has not yet been formed, the same steel bar is written into the central interspersed record to be confirmed, and the central area data is read after the shear record of the other end face of the same steel bar is formed.

[0093] When the central region of the other end face of the same steel bar is still a phase abnormal region, the same steel bar is written into the central inclusion risk steel bar.

[0094] Among them, the anomaly in the central region appears continuously on both end faces of the same steel bar, indicating that the anomaly in the central region is not limited to a single shear end face, and can be used to distinguish steel bars with central inclusion risk from single end face interference.

[0095] When the central region of the other end face of the same steel bar is not a phase anomaly region, the current shearing record is written into the local anomaly record of the current shearing end face, but not into the steel bar with central inclusion risk.

[0096] For the pairing data of the intermediate ring area, read each sector of the intermediate ring area of ​​the tail end face of the previous steel bar and the sector of the intermediate ring area at the opposite position of the head end face of the next steel bar.

[0097] If the middle ring sector of the tail end face of the preceding steel bar and the middle ring sector of the head end face of the following steel bar are both phase anomalous regions, and the central regions of the tail end face of the preceding steel bar and the head end face of the following steel bar are not phase anomalous regions, then the tail segment of the preceding steel bar and the head segment of the following steel bar are written into the segregation zone risk segment.

[0098] Among them, the pairing anomaly in the middle ring area is used to indicate that the anomaly appears at opposite positions on both sides of the same shear plane, and the absence of anomaly in the central area is used to exclude the influence of defects in the central area on the judgment of the middle ring area.

[0099] When no intermediate ring region pairing anomaly is formed, and the intermediate ring region phase anomaly area appears continuously along adjacent sectors within the same end face, the intermediate ring region data of the other end face of the same steel bar is read according to the steel bar end face index table.

[0100] When the shear record of the other end face of the same steel bar has not yet been formed, the same steel bar is written into the non-uniformity confirmation record, and the intermediate ring area data is read after the shear record of the other end face of the same steel bar is formed.

[0101] When consecutive adjacent sector phase abnormality areas reappear in the middle ring area of ​​the other end face of the same steel bar, the same steel bar will be written as a steel bar with uneven structure risk.

[0102] For example, when at least two circumferentially connected sectors in the middle ring region of the other end face of the same steel bar are both phase anomalous regions, and the orientation of the anomalous sector is consistent with the orientation of the anomalous sector in the middle ring region of the current end face, the same steel bar is written as a steel bar with uneven structure risk; at least two circumferentially connected sectors are used to exclude occasional anomalies caused by local interference on the end face in a single sector, and the consistent orientation of the anomalous sectors is used to confirm that the anomaly has length direction continuity between the two end faces of the same steel bar.

[0103] Among them, the anomaly in the middle ring region appears continuously along the adjacent sectors on both end faces of the same steel bar, indicating that the anomaly is continuous along the length of the steel bar, and can be used to judge the risk of uneven structure in steel bars.

[0104] When no consecutive adjacent sector phase abnormality areas reappear in the middle ring area of ​​the other end face of the same steel bar, the current shearing record is written into the end face local interference record, and the steel bar with uneven tissue risk is not written.

[0105] For the pairing data of the outer ring area, read each sector of the outer ring area of ​​the tail end face of the previous steel bar and the sector of the outer ring area at the opposite position of the head end face of the next steel bar, and make a judgment based on the pressure change pattern of the cutting edge section and the pressure change pattern of the cutting edge section.

[0106] If the cutting edge sector of the outer edge ring area of ​​the tail end face of the current steel bar is a phase abnormality area, and the outer edge sector of the head end face of the next steel bar is not a phase abnormality area, and the pressure change pattern of the cutting edge section is that the shear pressure first increases and then falls back to the range of the pressure change pattern of the middle shear section, the current shear record is written into the tool scratch record of the tail end face of the previous steel bar, and no steel bar material abnormality judgment data is output.

[0107] It should be noted that the pressure change pattern in the entry section is characterized by the shearing pressure first increasing and then falling back to the range of the pressure change pattern in the middle shear section. This indicates that there is a short-term contact anomaly when the shearing tool enters the outer edge of the steel bar. However, the anomalies do not appear in pairs on both sides of the same shearing plane. Therefore, the corresponding record is treated as the tool scratch record of the previous steel bar tail end face.

[0108] Among them, the pressure change pattern in the entry section is used to indicate that there is local contact interference when the shearing tool enters the outer edge of the steel bar, and the phase anomaly on one side of the outer edge is used to indicate that the anomaly does not appear in pairs on both sides of the same shearing plane.

[0109] When the sector on the edge of the outer ring of the head end face of the next steel bar is a phase abnormality area, and the sector on the opposite side of the tail end face of the previous steel bar is not a phase abnormality area, and the pressure change pattern of the edge segment is characterized by a pressure increase segment before the shear pressure decreases and a pressure decrease segment after the pressure increase segment, the current shear record is written into the burr record of the head end face of the next steel bar, and no abnormality judgment data of steel bar material is output.

[0110] It should be noted that the pressure change pattern in the off-edge section is characterized by a pressure increase segment before the shear pressure decreases, followed by a pressure decrease segment, indicating that there is a local tearing effect before the shearing tool leaves the outer edge of the steel bar. Since the phase anomaly area only appears in the off-edge sector of the end face of the next steel bar and does not appear in pairs on both sides of the same shearing plane, the current shearing record is treated as a burr record of the end face of the next steel bar.

[0111] Among them, the pressure change pattern of the off-edge section is used to indicate that there is local tearing interference when the shearing tool leaves the outer edge of the steel bar, and the phase anomaly on one side of the outer edge is used to indicate that the anomaly does not appear in pairs on both sides of the same shearing plane.

[0112] When the outer edge sector of the tail end face of the current steel bar and the outer edge sector of the head end face of the next steel bar are both phase abnormal regions, and the pressure change pattern of the entry section does not show that the shear pressure first rises and then falls back to the range of the pressure change pattern of the middle shear section, and the pressure change pattern of the exit section does not show that there is a pressure rise before the shear pressure falls and then a pressure fall after the pressure rise, the corresponding end of the steel bar is written into the surface folding risk section.

[0113] Among them, the outer edge ring area pairing anomaly is used to indicate that the outer edge anomaly exists in opposite positions on both sides of the same shear plane, and the pressure change pattern of the entry section and the pressure change pattern of the exit section are used to eliminate shear tool scratches and shear end face burrs.

[0114] S4. Write the abnormal judgment data and shear interference judgment data of steel bar material into the quality monitoring table, and generate steel bar production disposal prompts based on the quality monitoring table.

[0115] Furthermore, the abnormal judgment data and shear interference judgment data of the steel bar material are read.

[0116] Among them, the abnormal judgment data of steel bar materials includes the central loose risk section, the central inclusion to be confirmed record, the central inclusion risk steel bar, the segregation zone risk section, the uneven structure to be confirmed record, the uneven structure risk steel bar, and the surface fold risk section.

[0117] The shearing interference judgment data includes records of local anomalies on the current shearing end face, records of local interference on the end face, records of missing end face data, records of tool scratches on the tail end face of the previous steel bar, and records of burrs on the head end face of the next steel bar.

[0118] Furthermore, a quality monitoring table is established according to the steel bar furnace number, steel grade, specification, rolling batch, length number, and steel bar conveying sequence.

[0119] The quality monitoring form includes shearing record number, steel bar furnace number, steel grade, specifications, rolling batch, length number, end face where the abnormality is located, reading area of ​​the end face where the abnormality is located, steel bar material abnormality judgment data, shearing interference judgment data, and production handling prompts.

[0120] When the abnormal judgment data of steel bar material includes the central loose risk section, write the central loose risk section, the corresponding shearing record number, the tail end face of the previous steel bar, the head end face of the next steel bar, the start and end positions of the tail section of the previous steel bar and the start and end positions of the head section of the next steel bar in the quality monitoring table, and write the production handling prompt as the end cutting and lengthening prompt.

[0121] After reading the end-cut extension prompt, add the tail section of the previous steel bar and the head section of the next steel bar to the extension cutting list. The extension cutting list includes the corresponding steel bar length number, the end face where the abnormality is located, the length of the risk section, and the start and end positions of the cutting.

[0122] When the abnormal judgment data of steel bar material includes a record of central inclusion to be confirmed, write the record of central inclusion to be confirmed into the quality monitoring table, and query the shearing record of the other end face of the same steel bar according to the steel bar end face index table.

[0123] If the shearing record for the other end face of the same steel bar has not yet been formed, an isolation prompt will not be generated, and the same steel bar will be kept in the pending confirmation queue.

[0124] If a shearing record has already been formed for the other end face of the same steel bar, the data of the central area of ​​the other end face of the same steel bar will be added to the central inclusion record to be confirmed, for use in updating the steel bar material anomaly judgment data.

[0125] When the abnormal steel bar material judgment data includes steel bars with central inclusion risk, write the steel bars with central inclusion risk into the quality monitoring table, and write the production disposal prompt as the whole bar isolation and re-inspection prompt.

[0126] After reading the whole isolation re-inspection prompt, transfer the same steel bar to the isolation re-inspection station.

[0127] When the abnormal judgment data of steel bar material includes the segregation zone risk section, write the segregation zone risk section, the corresponding shearing record number, the tail end face of the previous steel bar and the head end face of the next steel bar into the quality monitoring table, and write the production disposal prompt as the low-magnification inspection prompt for steel bars from the same furnace.

[0128] After reading the low-magnification inspection prompt for steel bars from the same furnace, include steel bars from the same furnace number, same steel grade, and same rolling batch in the low-magnification inspection list.

[0129] When the abnormal judgment data of steel bar material includes records of uneven microstructure to be confirmed, write the records of uneven microstructure to be confirmed into the quality monitoring table, and look up the shearing records of the other end face of the same steel bar according to the steel bar end face index table.

[0130] If the shearing record for the other end face of the same steel bar has not yet been formed, an isolation prompt will not be generated, and the same steel bar will be kept in the pending confirmation queue.

[0131] If a shear record has already been formed for the other end face of the same steel bar, the data of the middle ring area of ​​the other end face of the same steel bar will be added to the record for non-uniformity of structure to be confirmed, for use in updating the data for judging abnormalities in steel bar materials.

[0132] When the abnormal judgment data of steel bar material includes steel bars with uneven microstructure risk, write the steel bars with uneven microstructure risk in the quality monitoring table, and write the production disposal prompt as the mechanical property verification prompt of steel bars in the same furnace.

[0133] After reading the mechanical property verification prompt for steel bars from the same furnace, steel bars from the same furnace number, same steel grade, and same rolling batch are included in the mechanical property verification list.

[0134] When the abnormal judgment data of steel bar material includes the surface fold risk section, write the surface fold risk section, the end face where the abnormality is located, and the sector of the outer ring area where the abnormality is located in the quality monitoring table, and write the production handling prompt as the end grinding prompt.

[0135] After reading the end grinding prompt, the end face where the abnormality is located and the sector of the outer ring area where the abnormality is located are sent to the grinding station.

[0136] When the shearing interference judgment data includes records of local anomalies on the current shearing end face, records of local interference on the end face, records of tool scratches on the tail end face of the previous steel bar, or records of burrs on the head end face of the next steel bar, the corresponding shearing interference judgment data should be written into the quality monitoring table, and the production handling prompts should be written as retained records.

[0137] After reading the retained record, no whole-line isolation prompt or end-cut extension prompt is generated.

[0138] When the shear interference judgment data includes records of missing end face data, write the records of missing end face data into the quality monitoring table and write the production handling prompt as a retained record.

[0139] After reading the missing end face data records, retain the shear pressure segment data and the steel bar end face index table; if the other end face of the same steel bar forms a valid end face pair reading data in subsequent shear records, re-execute the material anomaly judgment process based on the end face pair reading data of the other end face of the same steel bar; if both ends of the same steel bar have missing end face data records, generate a sampling review prompt.

[0140] Furthermore, the quality monitoring table is arranged according to the treatment level indicated by the production disposal prompts.

[0141] The processing levels, from highest to lowest, are: whole bar isolation and re-inspection prompt, end cutting and lengthening prompt, low-magnification sampling inspection prompt for steel bars from the same furnace, mechanical property verification prompt for steel bars from the same furnace, end grinding prompt, sampling re-inspection prompt, and record retention.

[0142] When the same steel bar has both a central inclusion risk section and a surface fold risk section, a whole-bar isolation re-inspection prompt is executed, and the reading area of ​​the end face where the surface fold risk section is located is retained; when the same steel bar has both a segregation risk section and a structural inhomogeneity risk section, a low-magnification inspection prompt for steel bars from the same furnace and a mechanical property verification prompt for steel bars from the same furnace are generated simultaneously; when the same shearing record only contains shearing interference judgment data, the production line quality terminal only retains the record and does not trigger abnormal handling of steel bar materials.

[0143] like Figure 5 Used to characterize the impact of different quality monitoring methods on the false alarm rate of shear interference; by Figure 5 It is evident that before cross-shear confirmation was implemented, the false alarm rates of the three methods for shear interference were roughly at the same level. After cross-shear confirmation was implemented, the single-end-face eddy current direct judgment method was significantly affected by tool scratches, burrs, water stains, and oxide scale, and the false alarm rate remained in a high range. When only end-face pairing reading was used, it was possible to partially eliminate interference from one side of the end face, but due to the lack of continuity confirmation of the other end face of the same steel bar, the reduction in the false alarm rate was limited. The method of this invention pairs the opposite position regions of the tail end face of the previous steel bar and the head end face of the subsequent steel bar for reading, and combines the segmented shear pressure data and end-face index relationship for cross-shear confirmation, so that shear interference and material anomalies can be effectively distinguished, the false alarm rate drops rapidly and stabilizes at a low level, and unnecessary whole-bar isolation, end cutting, and manual verification are reduced.

[0144] like Figure 6 Used to characterize the impact of different methods on the consistency rate of material anomaly verification; by Figure 6 It is evident that single-end-face anomaly judgment mainly relies on the phase change of eddy currents on a single end face, which can easily lead to misidentification of local shear marks as central inclusions, segregation, or surface folds, thus limiting the improvement in the consistency rate of verification. The end-face pairing without index method can compare the opposite positions of two end faces formed by the same shearing, which improves the stability of material anomaly identification, but lacks confirmation criteria for anomalies that exist continuously along the length of the steel bar. The method of this invention establishes an end-face index relationship between the head and tail end faces of the same steel bar based on end-face pairing reading, and reads the other end face of the same steel bar for cross-shear confirmation, so that anomalies in the central region, intermediate ring region, and outer ring region can be classified according to material continuity and shear interference, significantly improving the consistency rate of material anomaly verification, which is conducive to the formation of more reliable quality monitoring tables and production handling prompts.

[0145] In summary, this invention utilizes the newly formed end face created by fixed-length shearing as the material condition detection surface of the steel bar, achieving online monitoring of the internal quality of the steel bar without additional sample cutting. By pairing and reading the opposite end face reading areas of the previous steel bar tail end face and the subsequent steel bar head end face formed in the same shearing, it achieves the distinction between material anomalies and shearing interferences such as tool scratches and end face burrs. By establishing the end face index relationship between the same steel bar head end face and tail end face and performing cross-shear confirmation, it achieves reliable judgment of continuous material anomalies such as central inclusions and uneven structure.

Claims

1. A steel bar production quality monitoring method based on an intelligent sensing system, characterized by, include: At the steel bar length shearing station, the steel bar identification, shearing displacement and shearing pressure are collected. Taking one shearing action as the shearing record unit, the previous steel bar tail end face formed by the front side of the shearing tool, the next steel bar head end face formed by the rear side of the shearing tool and the segmented data of shearing pressure are written into the same shearing record, and the end face index relationship of the same steel bar head end face and tail end face is established. After shearing, the eddy current phase data of the tail end face of the previous steel bar and the head end face of the next steel bar are read. The two end faces are divided into the central region, the middle ring region and the outer ring region respectively. According to the cutting direction of the shearing tool, the steel bar conveying direction and the end face observation direction, the end face region of the tail end face of the previous steel bar and the opposite end face region of the head end face of the next steel bar are paired and read to form end face paired reading data. Based on the end face pairing data and shear pressure segmentation data, identify whether there is a pairing anomaly between the two end faces formed by the same shearing, and read the end face data of the other end face of the same steel bar according to the end face index relationship. Confirm the pairing anomaly across shearing, and generate steel bar material anomaly judgment data and shear interference judgment data. Write the abnormal steel bar material judgment data and shear interference judgment data into the quality monitoring table, and generate steel bar production disposal prompts based on the quality monitoring table.

2. The steel bar production quality monitoring method based on the intelligent sensing system according to claim 1, characterized by, The segmented shear pressure data includes: The start time and complete shearing position of a shearing action are determined based on the shearing displacement data. The shearing action is divided into the entry segment, the middle shearing segment and the exit segment according to the displacement range of the shearing tool relative to the cross section of the steel bar. The pressure change patterns of the shear pressure in the entry section, middle shear section, and exit section as a function of shear displacement are read separately, and the pressure change patterns of the entry section, middle shear section, and exit section are written into the same shear record.

3. The steel bar production quality monitoring method based on the intelligent sensing system according to claim 1 or 2, characterized by, The establishment of the end-face index relationship between the head and tail ends of the same steel bar includes: Establish a steel bar end face index table; During continuous fixed-length shearing, the shearing record number of the head end face and the shearing record number of the tail end face of the same steel bar are written into the same steel bar end face index record. When the shearing record of the other end face of the same steel bar has not yet been formed, the corresponding steel bar is written into the end face confirmation record; The steel bar end face index table includes the steel bar furnace number, steel grade, specification, rolling batch, length number, shearing record number of the head end face, and shearing record number of the tail end face.

4. The steel bar production quality monitoring method based on the intelligent sensing system according to claim 1, characterized by, The specific steps for dividing the two end faces into a central region, a middle ring region, and an outer ring region are as follows: Establish the end-face plane coordinates based on the scanning position of the end-face eddy current detection head; Based on the geometric center and the radius of the steel bar, the tail end face of the preceding steel bar and the head end face of the following steel bar are divided into the central region, the middle ring region and the outer ring region, respectively, and eddy current phase data are obtained. The end face plane coordinates take the geometric center of the steel bar end face as the origin, the cutting direction of the shearing tool as the first coordinate direction, and the end face direction perpendicular to the cutting direction of the shearing tool as the second coordinate direction.

5. The steel bar production quality monitoring method based on the intelligent sensing system according to claim 4, characterized by, The acquisition of eddy current phase data includes: The middle ring region and the outer ring region are divided into multiple sectors according to the shearing tool entry side, shearing tool exit side, steel bar support side and steel bar free side, and the eddy current phase data of each sector are read. When there are multiple eddy current phase sampling points in the same end face reading area, the median of the multiple eddy current phase sampling points is read as the eddy current phase data of the end face reading area.

6. The steel bar production quality monitoring method based on the intelligent sensing system according to claim 5, characterized by, The data reading process for forming end-face pairing includes: Based on the cutting direction of the shearing tool, the conveying direction of the steel bar, and the observation direction of the end face, determine the opposite position pairing relationship between the tail end face of the previous steel bar and the head end face of the next steel bar. Pair the cutting edge side region of the tail end face of the preceding steel bar with the cutting edge side region of the head end face of the following steel bar, pair the cutting edge side region of the tail end face of the preceding steel bar with the cutting edge side region of the head end face of the following steel bar, and pair the center region of the tail end face of the preceding steel bar with the center region of the head end face of the following steel bar to form center region pairing data, middle ring region pairing data, and outer ring region pairing data.

7. The method for monitoring the production quality of steel bars based on an intelligent sensing system as described in claim 1 or 6, characterized in that, The identification of whether there is a pairing anomaly between two end faces formed in the same shearing process includes: When the phase difference between the end face reading area and the adjacent end face reading area is greater than the area phase difference limit, the end face reading area is recorded as a phase abnormal area; When both the end face regions of the tail end face of the preceding steel bar and the head end face of the following steel bar are phase abnormal regions, it is determined that there is a pairing abnormality between the two end faces formed by the same shearing.

8. The method for monitoring the production quality of steel bars based on an intelligent sensing system as described in claim 7, characterized in that, The pairing anomalies include: pairing anomalies in the central region, pairing anomalies in the middle ring region, and pairing anomalies in the outer ring region; When both the central region of the tail end face of the preceding steel bar and the central region of the head end face of the following steel bar are phase abnormal regions in the paired data of the central region, a central region pairing abnormality is formed. When the intermediate ring region pairing data of the preceding steel bar tail end face and the intermediate ring region sector of the following steel bar head end face are both phase abnormal regions, and the central region of the preceding steel bar tail end face and the central region of the following steel bar head end face are not phase abnormal regions, an intermediate ring region pairing abnormality is formed. When both the outer ring sector of the tail end face of the preceding steel bar and the outer ring sector of the head end face of the following steel bar are phase abnormal regions in the outer ring pairing data, an outer ring pairing abnormality is formed.

9. The method for monitoring the production quality of steel bars based on an intelligent sensing system as described in claim 8, characterized in that, The cross-shear confirmation includes: When there is an anomaly in the pairing of the central region, and there are no more than two pressure rise segments arranged in order of shear displacement in the pressure change pattern of the middle shear segment, the central region data of the other end face of the same steel bar is read according to the end face index relationship. If the shearing record for the other end face of the same steel bar has not yet been formed, a central inclusion record to be confirmed will be generated. If the central region of the other end face of the same steel bar is still a phase anomaly region, then a steel bar with central inclusion risk is generated. If the central region of the other end face of the same steel bar is not a phase anomaly region, a local anomaly record of the current shear end face is generated. When the phase anomaly region in the intermediate ring area does not satisfy the paired reading relationship between the tail end face of the preceding steel bar and the head end face of the following steel bar, but appears continuously along adjacent sectors within the same end face, the intermediate ring area data of the other end face of the same steel bar is read according to the end face index relationship. If the shear record for the other end face of the same steel bar has not yet been formed, a record for non-uniform structure to be confirmed will be generated. If consecutive adjacent sector phase abnormality areas reappear in the middle ring area on the other end face of the same steel bar, a steel bar with uneven structure risk is generated. If no consecutive adjacent sector phase anomaly regions reappear in the middle ring region of the other end face of the same steel bar, then a local interference record of the end face is generated.

10. The method for monitoring the production quality of steel bars based on an intelligent sensing system as described in claim 9, characterized in that, The generated steel bar material anomaly judgment data and shear interference judgment data include: when there is a pairing anomaly in the central region, and there are two or more pressure rise segments arranged in shear displacement order in the pressure change pattern of the middle shear segment, and there is a pressure fall segment between adjacent pressure rise segments, a central loosening risk segment is generated. When there is an anomaly in the pairing of intermediate ring regions, a risk segment of the segregation zone is generated; When there is an abnormal pairing in the outer ring area, and the pressure change pattern in the entry section does not show that the shear pressure first rises and then falls back to the range of the pressure change pattern in the middle shear section, and the pressure change pattern in the exit section does not show that there is a pressure rise before the shear pressure falls and then a pressure fall after the pressure rise, a surface folding risk section is generated. Write the following into the steel bar material anomaly judgment data: central loose risk section, central inclusion unconfirmed record, central inclusion risk steel bar, segregation zone risk section, uneven structure unconfirmed record, uneven structure risk steel bar, and surface fold risk section. Record the current local anomaly on the shearing end face, the local interference on the end face, the tool scratch record on the tail end face of the previous steel bar, and the burr record on the head end face of the next steel bar into the shearing interference judgment data.

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