68 results about "Eddy-current testing" patented technology

The invention belongs to the technical field of eddy current detection. The eddy current automatic detection and calibration method comprises the steps that a pose deviation matrix is calculated, a mechanical arm carrying an eddy current probe is controlled to conduct pose adjustment according to the pose deviation matrix, and the current pose of the eddy current probe is obtained; under the current pose, an inductive impedance signal caused by eddy current change of the workpiece to be detected is obtained, and associated data of the current pose and the inductive impedance signal are obtained; and performing defect positioning on the workpiece entity to be detected according to the associated data, calculating the signal-to-noise ratio of the workpiece entity to be detected in combination with a defect positioning result, performing iterative optimization on the signal-to-noise ratio within a preset time, and determining the optimal detection pose of the eddy current probe when the signal-to-noise ratio is maximum. According to the method, personal errors caused by traditional manual calibration are eliminated, the multi-attitude detection requirement of the complex curved surface workpiece can be met, and the accuracy of defect quantitative analysis is remarkably improved.

The invention discloses a fusion device magnet coil copper conductor nondestructive testing method and a computer product, and relates to the technical field of nondestructive testing, the method comprises the following steps: obtaining original eddy current testing signals of a to-be-tested object or a plurality of areas of the to-be-tested object under specific physical conditions; preprocessing the original eddy current detection signal, wherein the preprocessing comprises denoising and signal correction; extracting features from the preprocessed signals and carrying out normalization processing; on the basis of a pre-established multi-parameter model related to the physical conditions of the to-be-tested object, theoretical signals of the to-be-tested object under various physical conditions are predicted through finite element simulation; and performing matching estimation on the normalized signal and a theoretical signal to obtain an estimated signal, and evaluating the defect existence probability based on the estimated signal. Based on an eddy current testing technology, a probe scans a sample and obtains a signal, and a finite element analysis method is combined to simulate and evaluate defects such as cracks possibly existing in a material.

The invention provides a weld joint dynamic eddy current detection method and system based on reinforcement learning, the system comprises a sensing layer, a decision layer, an execution layer and an identification layer, the sensing layer is used for collecting detection data of a weld joint surface, and the sensing layer comprises an eddy current sensor, a laser displacement meter and a thermal infrared imager; the decision-making layer is connected with the sensing layer and is used for dynamically adjusting detection parameters based on a reinforcement learning algorithm; the execution layer is connected with the decision layer, is used for executing a detection action according to the adjusted detection parameters, and comprises a four-axis linkage eddy current sensor and a frequency converter; the identification layer is connected with the sensing layer and the decision-making layer, is used for identifying weld defects based on the eddy current signals, and comprises a multi-defect identification model; and the decision layer dynamically adjusts detection parameters of the execution layer through a reinforcement learning algorithm by taking the time-frequency characteristic of the eddy current signal, the lift-off gap and the environment temperature as a state space and taking the frequency adjustment amount and the lift-off gap control instruction as an action space, so that real-time detection of the apparent defects of the welding seam is realized.

A kind of eddy current testing probe and method for identifying any crack and direction around hole, the probe includes a pie-shaped detection coil with middle magnetic core, the magnetic core not only ensures accurate positioning, but also uses magnetic collection effect by enhancing coil inductance, to strengthen the magnetic field inside and back of hole.The probe is also equipped with three layers of excitation coil, one layer and two layers of coil are arranged orthogonally, three layers and one layer of coil are at an angle of 135 °, realize the efficient detection of any direction crack and identify the direction of any crack defect.The flexible support of probe enables it to adapt to curved surface structure, widen the application range.The detection method uses orthogonal differential technology, uses the symmetry of hole structure to identify defects around hole, significantly improve the detection sensitivity of defects on the back and inside of hole structure.Compared with traditional surface and near-surface defect eddy current testing technology, the present application provides a more effective solution for high-precision detection of hole structure through innovative coil configuration and defect identification method.

The invention relates to the technical field of aero-engine nondestructive testing, and discloses an aero-engine support plate blade in-situ eddy current testing device and a testing method thereof, and the aero-engine support plate blade in-situ eddy current testing device comprises a handle, a telescopic probe rod and a testing end. The detection end is rotationally connected with the telescopic probe rod and comprises an adjusting swing block, a supporting end base, a clamping and positioning assembly and a transmission detection mechanism. The clamping and positioning assembly adopts a V-shaped fork block design, and can adapt to the shape and thickness of the blade for clamping, so that the detection end and the blade are kept stable. The transmission detection mechanism is composed of a miniature lead screw, a linear guide rail, an anti-backlash gear set and a servo motor and drives the detection probe assembly to accurately move along the surface of the blade. The detection probe adopts a leaf spring to support a flexible array eddy current sensor, and self-adaptive adjustment can be realized to ensure that the detection surface is tightly attached to the curved surface of the blade. The invention provides a device and a method capable of realizing rapid, full-area and high-sensitivity in-situ eddy current detection on a support plate blade under the condition that an engine is not disassembled and adaptive to air inlet space constraint.

The utility model relates to detection equipment for a chemical agent for metal, which comprises a seat body I, the upper end of the seat body I is connected with a three-axis moving platform, and the interior of the seat body I is fixedly connected with a drying box, a weight measuring part, an oil coating part and a cleaning test component; one side of the Z-axis moving end of the three-axis moving platform is fixedly connected with a swing test assembly, and the swing test assembly comprises a reciprocating swing unit; the reciprocating swing unit comprises a first motor, a third rotary disc, a rod body, a swing rod, a third movable groove and an electric clamping jaw. The cleaning test assembly comprises a shell II, a cavity, a cover body, an opening and an eddy current test assisting unit; the eddy current testing assisting unit comprises a second motor, a second rotating disc rotationally connected to the inner wall of the cavity, a first rotating disc rotationally connected to the lower end of the cover body, and a column body connected between the first rotating disc and the second rotating disc. Compared with the prior art, the dynamic condition of a workpiece in actual use can be simulated, different working conditions can be simulated, the test result has higher application value, cleaning process parameters are accurately verified and optimized, and universality is achieved.

To provide a coil module, a probe for detecting an eddy current, and an eddy current detector which can be manufactured at low cost in a short time.SOLUTION: The coil module includes: a cross coil having a first coil forming an annular shape surrounding a first axial line, and a second coil forming an annular shape surrounding a second axial line intersecting the first axial line and covering a part of an outer peripheral side of the first coil; and a coil holder having a storage recessed part for holding a plurality of cross coils formed in a state where a plurality of cross coils are arrayed in an arraying direction extending in a direction intersecting with the first axial line and the second axial line in a surface formed by the first axial line and the second axial line. In a pair of cross coils adjacent to each other in the arraying direction, the first coil of the cross coil on one side faces the second coil of the cross coil on the other side, and the second coil of the cross coil on one side faces the first coil of the cross coil on the other side.SELECTED DRAWING: Figure 3

The present application relates to the technical field of nondestructive testing, and provides a kind of dynamic characteristic eddy current detection system and method of scraper chain to solve the problems of low detection efficiency, unable to measure tension and speed synchronously, and probe is easily damaged in harsh environment and inconvenient to maintain, etc.The technical scheme of the system mainly includes: probe detection unit, adopts built-in iron core array coil layout, synchronously induces dynamic eddy current determined by chain speed and induced eddy current caused by tension change;Detection protection unit is provided with upper and lower open and close maintenance opening for quick maintenance;And detection lift-off regulation unit can accurately adjust the distance between probe and chain.The present application can realize the online synchronization, high-precision monitoring of scraper chain tension and speed, significantly improve the detection efficiency and reliability, and at the same time enhance the environmental adaptability and maintenance convenience of the system, and provide effective support for intelligent operation and maintenance of scraper conveyor.

The invention provides a pulsed eddy current detection device and detection method based on roller pair adjustment, and relates to the technical field of nondestructive detection. The device comprises a supporting frame, a roller pair, a telescopic driving mechanism, a detection probe, a sliding adjusting mechanism, a distance measuring unit and a control unit. The control unit maintains the constant distance between the detection probe and the surface of the detected rod body based on a feedback signal of the distance measuring unit; based on the distance and the roller state signal, a telescopic driving mechanism is controlled to adjust the posture of the roller pair, so that the axis of the roller pair is aligned with the axis of the measured rod body; and when a preset spacing stability condition and an alignment condition are met, controlling the detection probe to transmit a pulsed eddy current excitation signal to the detected rod body, and receiving and outputting an eddy current response signal for defect identification. The double-shaft lift-off effect is actively inhibited through dynamic closed-loop control, the stability and accuracy of a detection signal are guaranteed, and then the recognition rate and detection reliability of the rod body surface and near-surface defects are remarkably improved.

This application provides a compressed air supply mechanism, belonging to the field of eddy current testing technology, which can improve the pressure stability of the supplied compressed air, as well as the stability and accuracy of eddy current test results, and improve testing efficiency. The compressed air supply mechanism includes a supply pipeline, a compressor, a series-connected air storage unit, a multi-stage gradient filtration unit, and a multi-stage drying unit. The series-connected air storage unit is used to store the compressed air supplied by the compressor, precipitate impurities in the compressed air, and stabilize the pressure of the compressed air. The multi-stage gradient filtration unit includes multiple filtration modules and is used to further remove impurities and moisture from the compressed air. The multi-stage drying unit includes multiple drying modules and is used to remove moisture from the compressed air. The filtration modules, drying modules, and series-connected air storage unit are arranged alternately to enhance the filtration effect. This application also provides an eddy current testing system.

Method for eddy current testing of cast components (100) in a production line, wherein the cast components (100) are tested individually, comprising the steps: - Arranging the cast component (100) to be tested in a holder (300) which has at least two eddy current sensors (310); - Measuring local electrical conductivities of the cast component (100), for which each eddy current sensor (310) performs at least one measurement; - Evaluating the measurements, for which the measured values ​​of each eddy current sensor (310) are compared with a specific target value range (S), whereby the correct position of the cast component (100) arranged in the holder (300) is first detected using the eddy current sensors (310) and the measurements are then started automatically; - Evaluate the cast component (100) as defective if at least one measured value is outside the specific target value range (S), otherwise evaluate the cast component (100) as free of defects.

The invention belongs to the technical field of eddy current detection. The rail vehicle communication cable broken wire array eddy current detection probe comprises a plane winding displacement coil and a differential three-dimensional coil array, the plane winding displacement coil is used for applying high-frequency excitation, and the differential three-dimensional coil array is used for sensing broken wire defect magnetic field disturbance; the differential three-dimensional coil array comprises a plurality of differential three-dimensional coil pairs, each differential three-dimensional coil pair comprises a first three-dimensional coil and a second three-dimensional coil, the first three-dimensional coil is arranged at the position where the magnetic field disturbance gradient of the planar winding displacement coil is maximum, and the second three-dimensional coil is arranged at the position where the magnetic field disturbance gradient of the planar winding displacement coil is minimum. The detection bottleneck of a thick insulating layer is broken through, the channel consistency of the array probe is optimized, the detection efficiency and precision of the communication cable under the large lift-off working condition are greatly improved, interference is effectively restrained, the structural adaptability is high, and effective recognition of the broken wire in the cable can be achieved.

This invention provides a pulsed eddy current testing device and method for pipelines with insulation layers, belonging to the field of non-destructive testing technology for pipelines. It can at least partially solve the problems of existing pulsed eddy current testing methods, such as lift-off fluctuations and electromagnetic shielding interference caused by the outer metal protective layer, low testing reliability, and the need to remove the insulation layer. This invention includes: a flexible sensing strip and a control module. The flexible sensing strip is composed of multiple sensing strip segments assembled by a connecting mechanism and fitted onto the outside of the pipeline to be tested. From the inside out, it includes a lift-off compensation layer, an electromagnetic sensing layer, and a magnetic shielding layer. The lift-off compensation layer includes an airbag unit to adaptively conform to the surface of the outer protective layer to eliminate lift-off fluctuations. The electromagnetic sensing layer includes an excitation unit and a differential receiving unit to cancel common-mode interference from the outer protective layer at the hardware level. The magnetic shielding layer includes a magnetic unit array to concentrate the magnetic field and enhance penetration. This invention achieves in-service testing without removing the insulation layer through three-layer synergy.

This invention proposes a processing technology for hollow stabilizer bars in automobiles. The core of this technology lies in first achieving the final mechanical properties of the tubing through heat treatment, followed by forming and subsequent processing. The process involves online induction heat treatment of the hollow straight tube: sequential induction heating austenitization, quenching (martensitic transformation), and medium-frequency induction tempering (troostitic or sorbitic transformation), followed by water cooling to room temperature and eddy current testing. Then, the hollow straight tube, having achieved its final properties, undergoes end processing (flattening, drilling, welding), followed by cold bending into a three-dimensional shape using a CNC tube bending machine, and immediately undergoes stress-relief annealing to eliminate residual processing stress. Next, cold straightening is used to calibrate the position of key mounting points, followed by shot peening to improve fatigue life. Finally, coating (cleaning, phosphating, electrostatic spraying, baking) forms a protective layer. This process, by prior heat treatment followed by forming, effectively improves the product's heating uniformity, microstructure, and controls residual stress.

The utility model provides a heat insulation mechanism of an eddy current testing probe, which belongs to the technical field of nondestructive testing, and comprises a heat conduction piece which is annularly wrapped on the outer surface of the end part of the probe, is made of a flexible material, is simultaneously connected with a cooling assembly, and is connected with the cooling assembly to realize heat exchange so as to achieve the purpose of cooling the outer wall of a detector; the heat insulation part annularly wraps the outer surface of the heat conduction part, and a body of the heat insulation part is made of a flexible material and used for isolating external temperature from being transmitted to the heat conduction part; the cooling assembly is used for physically cooling the heat conduction piece in a heat exchange mode; according to the utility model, the eddy current detection probe is effectively cooled, so that the detection obstacle in a high-temperature environment is overcome, and the detection efficiency and reliability are improved.

A device and method for performing eddy current testing of a fuel channel. The eddy current testing device includes an array of eddy current sensors positioned along the outer circumference of a non-rotating section. The device is inserted into the pressure tube, and the active coils of the eddy current sensors are driven in a certain operating pattern, and data is collected from a reference coil of the eddy current sensors in a certain collection pattern. The relative arrangement of the eddy current sensors, the relative arrangement of the active coil and reference coil of each eddy current sensor, the operating pattern, and the collection pattern may be configured to reduce crosstalk and / or to maximize sensor coverage of the pressure tube area between adjacent eddy current sensors.

An eddy-current flaw detection device (1) comprises: a probe (10) that detects a change of eddy current in the component surface (41) of an object (40) to be examined; and a control unit (23) that causes the probe (10) to scan the component surface (41) along a scanning path (P) crossing edges (45) of the component surface (41). The scanning path (P) includes a first scanning path (P1a) along which scanning is executed in a first direction from a first region (47) adjacent to an edge region (46) existing along the edges (45) of the component surface (41), crossing the edge region (46), to a region (50) outside the edges (45). The probe (10) executes scanning along the first scanning path (P1a), and detects a change of eddy current in the edge region (46).

This invention relates to the field of nondestructive testing technology, and more particularly to a pulsed eddy current testing method for detecting the depth of blind holes in metals under lift-off disturbance conditions. The invention includes the following steps: S1: A conductor specimen without blind holes is tested using a pulsed eddy current tester, and the induced electromotive force output signal is used as a blank control group. This invention can be used for pulsed eddy current testing of the depth of blind holes in metals under lift-off disturbance conditions, breaking through the limitations of traditional methods on lift-off distance. It has strong adaptability to lift-off disturbances and can accurately detect within a large lift-off range. The detection accuracy is improved through characteristic curve conversion and standard curve comparison, and comprehensive defect information can be obtained. In practical applications, it plays an important role in industrial production quality control and equipment maintenance safety inspection, enabling rapid and accurate detection of blind hole depth, ensuring product quality and equipment safety, improving production efficiency, and reducing costs.

The invention discloses aluminum profile online eddy current detection equipment, which comprises a workbench, a conveyor belt mounted on the workbench, a detection assembly mounted on the workbench and a calibration assembly mounted on the workbench, and is characterized in that the conveyor belt drives a to-be-detected component to be conveyed towards a first direction and sequentially pass through the calibration assembly and the detection assembly; the detection assembly comprises a first support fixedly connected to the workbench, a connecting base installed on the first support and an eddy current probe installed on the connecting base, a roller is further arranged on the side, corresponding to the conveying belt, of the connecting base, and the roller is used for abutting against and pressing a to-be-detected component and enabling the probe and the to-be-detected component to keep a gap. The automation degree of online detection of the aluminum profile can be improved, the detection efficiency is improved, and the aluminum profile can better adapt to high-speed production actions of an assembly line.

The invention relates to a method for detecting breakage of magnetic steel based on an eddy current testing principle, which belongs to the field of nondestructive testing technology and comprises the following steps: S1, feeding produced and processed magnetic steel into a vibrating disk on a workbench, and feeding the magnetic steel onto a conveying belt on the workbench by the vibrating disk; s2, the conveying belt conveys the magnetic steel to an eddy current detector on a workbench, the eddy current detector detects the magnetic steel, the waveform trajectory diagram of the magnetic steel detected by the eddy current detector is compared with the waveform trajectory diagram of qualified magnetic steel, and whether defects exist in the magnetic steel or not is detected; s3, the conveying belt continues to convey the magnetic steel, and a defective product processing mechanism on the workbench loads and unloads the defective magnetic steel from the conveying belt; and S4, the qualified magnetic steel on the conveying belt is discharged and packaged through a discharging and packaging mechanism on the workbench. According to the invention, on the basis of guaranteeing the defective product detection cost in the magnetic steel production and processing process, the detection efficiency and precision are effectively improved.

This application provides a thickness-compensated eddy current detection method, apparatus, and storage medium, applied to a chemical mechanical polishing (CMP) apparatus. The method includes: acquiring a first sensing signal from the eddy current sensor when the wafer moves to the detection area of ​​the eddy current sensor, wherein the eddy current sensor is disposed within a polishing disk included in the CMP apparatus, and a polishing pad for polishing a metal layer on the wafer is disposed on the top surface of the polishing disk; acquiring a second sensing signal from the eddy current sensor when a dressing head included in the CMP apparatus sweeps across the detection area; determining a first thickness value of the area on the polishing pad opposite to the eddy current sensor based on the second sensing signal; and determining the thickness of the metal layer on the wafer based on the first sensing signal and the first thickness value. The thickness-compensated eddy current detection method provided in this application can improve the detection accuracy of the metal layer thickness on the wafer.

The utility model relates to the technical field of workpiece flaw detection, in particular to an eddy current flaw detection tool. According to the invention, the two rotating mechanisms are symmetrically installed on the detection table, the rotating seat of each rotating mechanism is provided with an electric clamping mechanism composed of a clamping plate, a sliding groove, a third motor, a main gear, a driven gear and a screw rod, and the design of an adjusting mechanism is matched. The cylindrical workpiece can be rapidly limited in an electric clamping mode in the detection process, and the eddy current detection mechanism can be moved to the other rotating mechanism under the action of the adjusting mechanism when the detected cylindrical workpiece on one rotating mechanism is replaced. Therefore, the eddy current detection mechanism can carry out eddy current flaw detection on the end part of the columnar workpiece to be detected on the other rotating mechanism, the downtime of the device when the columnar workpiece is replaced is effectively shortened, the eddy current flaw detection process of the columnar workpiece is more continuous, and the detection efficiency is higher.

The invention discloses a bearing ring eddy current detection machine and system, the bearing ring eddy current detection machine and system comprise a frame body, a material pushing module, an inner gauge detection module, an eddy current detection module, a scrubbing module and a main control module, the frame body is fixedly provided with a detection platform used for supporting other parts, and the detection platform is provided with a material pushing module. A conveying table is fixedly connected to the detection platform, machined bearing rings are sequentially conveyed to the conveying table through a vibration disc and stably moved, and an inner gauge detection module is matched with a material pushing module to sequentially detect the inner diameters of the bearing rings. The eddy current detection module is matched with the pushing module to perform eddy current detection on the inner wall of the bearing ring passing the inner gauge detection, the eddy current detection module comprises an eddy current flaw detector, and the brushing module is arranged between the inner gauge detection module and the eddy current detection module. According to the technical scheme, it is ensured that the inner wall of the bearing ring is kept clean and tidy, and the detection precision of the eddy current detection module is improved.

The application discloses an aluminum profile on-line eddy current detection equipment, which comprises a workbench, a conveying belt installed on the workbench, a detection assembly installed on the workbench, and a calibration assembly installed on the workbench. The conveying belt drives the component to be detected to transmit towards a first direction and sequentially pass through the calibration assembly and the detection assembly. The detection assembly comprises a first support fixedly connected to the workbench, a connecting seat installed on the first support, and an eddy current probe installed on the connecting seat. A roller is further arranged on one side of the connecting seat corresponding to the conveying belt, which is used for abutting and compressing the component to be detected and keeping a gap between the probe and the component to be detected. The aluminum profile on-line detection automation degree can be improved, the detection efficiency can be improved, and the equipment can better adapt to the high-speed production action of the assembly line.

This invention relates to a three-in-one testing device for oxygen-free copper wire in new energy applications, belonging to the technical field of testing equipment for oxygen-free copper wire in new energy applications. It includes a testing platform and a wire routing mechanism mounted on top of the testing platform. The top of the testing platform is equipped with a testing module for testing oxygen-free copper wire. The testing module includes a mounting bracket, a slide rail, a testing camera, an eddy current testing module, and an ultrasonic testing module. The top of the testing platform also features a floating wire storage structure for buffering, and an external locking mechanism for locking in case of wire breakage. This three-in-one testing device for oxygen-free copper wire in new energy applications features adaptive buffering of wire routing tension, dual locking via air pressure assistance and electric progressive locking after wire breakage, and online cleaning before testing. It achieves stable high-speed wire routing without jamming, immediate clamping after wire breakage to prevent scattering, and real-time removal of surface impurities to ensure testing accuracy.

The present disclosure relates to eddy current detection technologies and discloses an in-situ rapid eddy current testing method for trailing edges of aircraft engine blades. The method utilizes a specially engineered elastic array eddy current sensor buckled to a fixed ring of an engine wheel. By rotating the engine wheel, a single-pass scan simultaneously inspects the trailing edges of tens to hundreds of the aircraft engine blades. Compared to conventional methods utilizing a single conformal probe manually traversed along the trailing edges, the present disclosure greatly improves the detection efficiency and has higher detection sensitivity.

The application provides a kind of eddy current detection system and method for conductive spherical surface structure, the system includes detection probe and detection radius auxiliary adjusting device.Detection probe is an absolute coil in Fermat spiral appearance, which can realize the surface detection of detection area, and the detection radius auxiliary adjusting device is used to set the protruding distance of the center of the detection coil.In actual detection, the protruding distance of the center of the detection coil is calculated by the radius of the spherical surface to be detected and the outer diameter of the coil, which improves the induced eddy current intensity near the coil center and the parallelism between the coil and the spherical surface to be detected, so that the difference signal between the detection signal and the detection signal of the defect-free place can be calculated to reduce the environmental noise interference, especially the lift-off noise signal.The probe has the advantages of being able to detect defects of conductive spherical surfaces with arbitrary curvature radius, fast detection speed and high adhesion to the spherical surface to be detected.

The utility model relates to the technical field of eddy current testing equipment, in particular to a probe lift-off device which comprises a base, a first groove is formed in the upper end face of the base, a through hole is formed in the groove bottom of the first groove, and a plurality of arc-shaped plates are arranged on the upper end face of the base. An annular groove is formed in the side face of the supporting seat, a tilting rod is arranged in the annular groove, the tilting rod is an L-shaped rod, the tilting rod is rotationally arranged between the two adjacent arc-shaped plates, an extrusion part is arranged at the upper end of the tilting rod, a first threaded hole is formed in the supporting seat, a first bolt penetrates through the through hole, and the upper end of the first bolt penetrates through the first threaded hole and is connected with a nut; a spring is arranged between the supporting seat and the base; the distance between the probe and a detected material can be adjusted by adjusting the position of the probe on the device so as to adapt to detection of different materials and working conditions, and the whole device is fixed at the detection position through the base, so that the problem of distance change caused by errors of handheld detection operation is avoided, and the accuracy of a detection result is ensured.

This invention relates to a method for manufacturing high-surface-quality steel wire for chain pins, comprising the following steps: steel smelting → continuous casting → heating of continuously cast billets → billet preparation → flaw detection and grinding of intermediate billets → wire rod heating → high-pressure water descaling → annealing → pickling and phosphating → wire drawing → finished product. The method employs a two-stage forming process, with a high compression ratio in billet rolling, wire rod rolling, and wire drawing, which reduces the impact of defects in the raw material on the finished product. During billet rolling, flame cleaning is used to remove surface defects from the billet. Before wire rod rolling, the intermediate billet undergoes surface flaw detection and full grinding to ensure a defect-free surface. Eddy current testing and high-reduction-ratio wire drawing ensure the depth of surface defects in the steel wire, and the high-reduction-ratio drawing results in higher wire hardness, improving the cutting performance for pin processing. Finally, the steel wire used in pin production can control the single-sided grinding residue to within 0.03mm, significantly improving material yield and surface defect compliance. Simultaneously, the high wire hardness provides excellent cutting performance for pin processing.

The application discloses a method and a detection device for improving the performance of eddy current detection of a flexible PCB, which are used for the eddy current detection of metal devices with irregular arc curved surfaces, such as mortise and tenon joints in a rotor blade mounting device of an aero-engine, and the like. The technical method comprises the following steps: a flexible bag with a deformable sandbag type is used to press a flexible PCB detection probe provided with an array type eddy current detection sensor to be closely attached to an irregular detection surface, and then corresponding detection signal data are extracted. The detection device comprises a multi-channel eddy current detection instrument (3), a flexible bag (21) and a flexible PCB detection probe (22). The flexible PCB detection probe (22) is arranged on the side of the flexible bag (21) close to a detected object, and an array type eddy current detection sensor (221) is arranged on the flexible PCB detection probe (22), so as to form an ultrathin film type detection probe. The effective penetration depth of the eddy current is improved, and meanwhile, the effective attachment between the flexible sensor and the workpiece can be better ensured, so that the expected detection effect of improving the detection performance is achieved.