Flange forge piece defect detection device and detection method

Abstract

The invention belongs to the technical field of flange detection, and particularly relates to a flange forge piece defect detection device and method.The flange forge piece defect detection device comprises a rotary clamping mechanism, a defect detection module, a force control executing mechanism, a marking mechanism and a control module, the defect detection module comprises an eddy current sensor and an ultrasonic probe, and the force control executing mechanism and the marking mechanism are also integrated on a shell; the control module is mounted in the electric control box; the eddy current sensor is used for monitoring a voltage fluctuation value in real time and generating a surface crack density coefficient through the control module; and the ultrasonic probe is used for monitoring an echo amplitude value in real time and generating an internal defect attenuation coefficient through the control module. By integrating the eddy current sensor and the ultrasonic probe, detection of surface cracks (voltage fluctuation monitoring) and internal defects (echo amplitude analysis) of the flange forge piece is synchronously achieved, the problem that the surface quality and the internal quality cannot be considered in a traditional single detection mode is solved, and the safety risk caused by missing detection of the defects is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flange detection, and particularly relates to a flange forging defect detection device and a detection method. BACKGROUND

[0002] The flange forging is a key connecting component in the fields of petroleum, chemical industry, electric power and machinery, and the structural integrity thereof is directly related to the operation safety of the complete equipment. In the forging production process, due to the factors such as material quality fluctuation, forging process parameter deviation (such as uneven temperature, insufficient forging force), and improper subsequent heat treatment, cracks and folds are easily generated on the surface of the flange forging, and porosity and inclusions are easily formed inside. If the flange forging with defects is put into use, it may lead to medium leakage, equipment failure and even safety accidents.

[0003] At present, the defect detection of the flange forging mainly depends on manual visual inspection, magnetic powder detection or single ultrasonic detection. The manual detection is greatly influenced by subjective experience, has a high missed detection rate and low efficiency; the magnetic powder detection can only detect surface and near-surface defects and cannot identify internal hidden dangers; the traditional ultrasonic detection needs to be manually operated by holding the probe, the detection range is limited, and it is difficult to realize the synchronous analysis of surface and internal defects. In addition, the existing detection equipment lacks automatic clamping and marking functions, and the defect position needs to be manually recorded after detection, which is difficult to meet the high-efficiency quality detection demand in large-scale production. Therefore, developing a device integrating automatic clamping, synchronous detection of surface and internal defects, intelligent evaluation and precise marking has become the key to improving the quality control level of the flange forging. SUMMARY

[0004] Based on the technical problems existing in the prior art, the present application provides a flange forging defect detection device and a detection method.

[0005] The flange forging defect detection device provided by the present application comprises a rotary clamping mechanism, a defect detection module, a force control execution mechanism, a marking mechanism and a control module. The defect detection module comprises an eddy current sensor and an ultrasonic probe embedded in the bottom of a shell, the force control execution mechanism and the marking mechanism are also integrated on the shell, and the control module is installed in an electric control box. The eddy current sensor is used for monitoring the voltage fluctuation value in real time and generating a surface crack density coefficient through the control module. The ultrasonic probe is used for monitoring the echo amplitude value in real time and generating an internal defect attenuation coefficient through the control module. The rotary clamping mechanism clamps and rotates the flange forging. The eddy current sensor monitors the voltage fluctuation value caused by the surface crack in real time and generates the surface crack density coefficient. The ultrasonic probe monitors the echo amplitude value caused by the internal defect in real time and generates the internal defect attenuation coefficient. The control module comprehensively analyzes the two coefficients to generate an evaluation coefficient, compares the evaluation coefficient with a reference threshold value, and controls the force control execution mechanism to apply a detection force to the defect area for re-inspection and controls the marking mechanism to mark the defect position according to the comparison result.

[0006] Preferably, the rotating clamping mechanism comprises a turntable rotatably connected to the top of the bottom plate, a motor one fixedly connected inside the turntable, a disc connected to the output shaft of the motor one, a plurality of arc-shaped push blocks fixedly connected to the top of the disc in annular array, a plurality of support plates inserted into the circumferential outer wall of the turntable corresponding to the push blocks, the ends of the support plates abutting against the arc surfaces of the push blocks, a plurality of guide columns fixedly connected inside the turntable and penetrating through the support plates, springs sleeved on the guide columns and fixedly connected at both ends to the support plates and the guide columns, a gear ring fixedly sleeved on the turntable, a gear meshingly connected to the gear ring and mounted on the output shaft of a motor two fixedly connected to the top of the bottom plate; the flange forge piece is placed on the turntable, the disc is driven to rotate by the motor one, the support plates are pushed by the push blocks, the support plates move on the guide columns and compress the springs, the flange forge piece is tightly fixed, then the gear is driven to rotate by the motor two, the gear ring and the turntable are driven to rotate by meshing, the flange forge piece is rotated in multiple directions for comprehensive detection, and the flange forge piece is loosened after the support plates are loosened.

[0007] Preferably, the force control execution mechanism comprises an electric cylinder and a pressure head, the pressure head is embedded in the bottom of the shell, the pressure head is fixed on the output shaft of the electric cylinder, and the electric cylinder is fixed in the shell; when the control module determines that there is a suspected defect, the electric cylinder receives the signal of the control module, drives the pressure head to move to the surface of the flange forge piece, makes the pressure head contact the surface of the flange forge piece and apply a preset pressure, further confirms the physical properties of the defect area through pressure feedback, and resets the pressure head after reinspection is completed.

[0008] Preferably, the marking mechanism is an inkjet marker, and the inkjet marker is embedded in the bottom of the shell; when the control module confirms that the flange forge piece has a defect and reaches a marking threshold, the inkjet marker receives the signal of the control module, sprays marking ink to the defect position, forms an obvious mark, and facilitates subsequent identification and processing.

[0009] Preferably, the top of the bottom plate is further fixedly connected with a fixing seat, the fixing seat is slidably connected with a mounting frame through guide columns, the side surface of the fixing seat is fixedly connected with an electric push rod, the mounting frame is fixed on the output shaft of the electric push rod, and the defect detection module is mounted at the top end of the mounting frame; after the flange is fixedly installed on the rotating clamping mechanism, the electric push rod works, the output shaft thereof is telescopic to drive the mounting frame to slide on the fixing seat along the guide columns, so that the defect detection module at the top end of the mounting frame is moved to a detection position.

[0010] Preferably, the execution steps of the control module for controlling the working states of the force control execution mechanism and the marking mechanism according to the comparison result are as follows: The eddy current sensor collects voltage fluctuation values; the ultrasonic probe collects echo amplitude values; the control module calculates a surface crack density coefficient, an internal defect attenuation coefficient and an evaluation coefficient R_df; if R_df<0.3: normal conveying, no marking; if 0.3≤R_df<0.6: the force control actuator is pressurized to 15N for re-inspection, and the suspicious area is marked; and R_df≥0.6: immediate shutdown to mark the defect position, and sound-light alarm.

[0011] Preferably, the generation logic of the surface crack density coefficient is: Based on the voltage fluctuation value sequence collected by the eddy current sensor within T time, the discrete degree of the sequence relative to the average voltage fluctuation value is calculated.

[0012] Preferably, the generation logic of the internal defect attenuation coefficient is: Based on the echo amplitude values of each position collected by the ultrasonic probe, the deviation percentage of the minimum amplitude value from the average amplitude of the complete area is calculated.

[0013] Preferably, the control module dynamically weights and sums the surface crack density coefficient and the internal defect attenuation coefficient through a preset weight coefficient.

[0014] The application also provides a flange forging defect detection method, comprising the following steps: S1, fixing the flange forging on the turntable; S2, starting the electric push rod to position the eddy current sensor and the ultrasonic probe at the bottom of the shell to the flange forging area to be detected, starting the motor two to drive the turntable and the flange forging to rotate to realize omnidirectional scanning; S3, the eddy current sensor collects the surface voltage fluctuation value in real time, and the control module calculates the surface crack density coefficient; the ultrasonic probe collects the internal echo amplitude value in real time, and the control module calculates the internal defect attenuation coefficient; S4, the control module weights and fuses the surface crack density coefficient and the internal defect attenuation coefficient to generate the evaluation coefficient R_df; if R_df<0.3, it is determined to be qualified, the flange forging is conveyed and not marked; if 0.3≤R_df<0.6, the defect area is subjected to 15N pressure re-inspection, and the suspicious area is marked; if R_df≥0.6, immediate shutdown to mark the defect position, and trigger sound-light alarm; S5, after the detection is completed, the flange forging is loosened and taken away.

[0015] Compared with the prior art, the application provides a flange forging defect detection device and detection method, which has the following beneficial effects: 1. A flange forging defect detection device and method, by integrating eddy current sensors and ultrasonic probes, synchronous detection of flange forging surface cracks (voltage fluctuation monitoring) and internal defects (echo amplitude analysis), solves the problem that traditional single detection method cannot consider surface and internal quality, reduces the safety risk caused by defect missed detection.

[0016] 2. A flange forging defect detection device and method, the control module generates evaluation coefficient by dynamically weighting fusion of surface crack density coefficient and internal defect attenuation coefficient, and sets three level threshold values (<0.3, 0.3~0.6, ≥0.6) to realize grading processing, combined with 15N pressure reinspection mechanism of force control actuator, effectively reduces misjudgment and missed judgment.

[0017] 3. A flange forging defect detection device and method, the rotary clamping mechanism realizes multi-directional rotation of the flange forging by motor driving, adjusts the position of the detection module by electric push rod, and completes omnidirectional scanning without manual intervention; the marking, shutdown and alarm actions triggered by the detection result are automatically executed by the control module, the single piece detection time is shortened to 1 / 3 of the traditional way, and the demand of large-scale production is met.

[0018] 4. A flange forging defect detection device and method, the arc-shaped push block in the rotary clamping mechanism cooperates with the spring, and can be driven by the motor to adapt to flange forgings of different diameters, solving the problem of frequent replacement of tooling of traditional clamps. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall structure schematic diagram of a flange forging defect detection device put forward in the application; Figure 2 It is the internal structure schematic diagram of a rotary table of a flange forging defect detection device put forward in the application; Figure 3 It is the defect detection module structure schematic diagram of a flange forging defect detection device put forward in the application; Figure 4 It is the force control actuator installation structure schematic diagram of a flange forging defect detection device put forward in the application; Figure 5 It is the system block diagram of a flange forging defect detection device put forward in the application.

[0020] In the figure: 1, base plate; 2, mounting frame; 3, shell; 4, eddy current sensor; 5, ultrasonic probe; 6, inkjet marker; 7, electric cylinder; 8, pressure head; 9, electric control box; 10, fixed seat; 11, electric push rod; 12, guide column; 13, rotary table; 14, motor one; 15, disc; 16, push block; 17, support plate; 18, guide column; 19, spring; 20, gear ring; 21, motor two; 22, gear. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] Reference Figure 1 Figure 5 A flange forging defect detection device, comprising a rotating clamping mechanism, a defect detection module, a force control execution mechanism, a marking mechanism and a control module, the defect detection module comprises an eddy current sensor 4 embedded in the bottom of the shell 3 and an ultrasonic probe 5, the force control execution mechanism and the marking mechanism are also integrated on the shell 3, the control module is installed in the electric control box 9, the control module 8 is an embedded controller (such as STM32 series), and a data fusion algorithm is integrated; The eddy current sensor 4 is used to monitor the voltage fluctuation value (reflecting crack interference) in real time, and generate a surface crack density coefficient through the control module; The ultrasonic probe 5 is used to monitor the echo amplitude value in real time, and generate an internal defect attenuation coefficient through the control module; The generated surface crack density coefficient and internal defect attenuation coefficient are comprehensively analyzed by the control module to generate an evaluation coefficient, the evaluation coefficient is compared with a pre-set reference threshold value, and the working state of the force control execution mechanism and the marking mechanism is controlled according to the comparison result; It should be noted that the output end and the input end of the eddy current sensor 4, and the output end and the input end of the ultrasonic probe 5 are electrically connected with the input end and the output end of the control module respectively, and the output end of the control module is electrically connected with the input end of the force control execution mechanism, the input end of the marking mechanism and the input end of the rotating clamping mechanism respectively; In use, the rotating clamping mechanism clamps the flange forging and drives it to rotate, the eddy current sensor 4 monitors the voltage fluctuation value caused by surface cracks in real time to generate a surface crack density coefficient, the ultrasonic probe 5 monitors the echo amplitude value caused by internal defects in real time to generate an internal defect attenuation coefficient, the control module comprehensively analyzes the two coefficients to generate an evaluation coefficient, compares the evaluation coefficient with a reference threshold value, and controls the force control execution mechanism to recheck the detection force on the defect area according to the comparison result, while controlling the marking mechanism to mark the defect position.

[0024] The rotating clamping mechanism comprises a rotating table 13 rotatably connected to the top of the bottom plate 1, a motor 1 4 fixedly connected inside the rotating table 13, a disc 15 connected to the output shaft of the motor 1 4, a plurality of arc-shaped push blocks 16 fixedly connected to the top of the disc 15 in an annular array, a plurality of support plates 17 inserted into the circumferential outer wall of the rotating table 13 and corresponding to the push blocks 16, the end of each support plate 17 being in abutment with the arc surface of the corresponding push block 16, a plurality of guide columns 18 fixedly connected inside the rotating table 13 and penetrating through the support plates 17, a spring 19 sleeved on each guide column 18 and fixedly connected at both ends to the support plate 17 and the guide column 18, and a gear ring 20 fixedly sleeved on the rotating table 13 and meshingly connected with a gear 22 mounted on the output shaft of a motor 2 1 fixedly connected to the top of the bottom plate 1. In use, the flange forge is placed on the rotating table 13, the disc 15 is driven to rotate by the motor 1 4, the support plates 17 are pushed by the push blocks 16, the support plates 17 are moved on the guide columns 18 and compress the springs 19, the flange forge is tightly fixed, then the gear 22 is driven to rotate by the motor 2 1, the gear ring 20 and the rotating table 13 are driven to rotate by the gear 22 in meshing, the flange forge is rotated in multiple directions for comprehensive detection, and after the detection is completed, the flange forge is released by the reset of the springs 19 after the support plates 17 are loosened.

[0025] The force control execution mechanism comprises an electric cylinder 7 and a pressure head 8, the pressure head 8 is embedded in the bottom of the shell 3, the pressure head 8 is fixed on the output shaft of the electric cylinder 7, and the electric cylinder 7 is fixed in the shell 3. In use, when the control module determines that there is a suspected defect, the electric cylinder 7 receives the signal of the control module, drives the pressure head 8 to move towards the surface of the flange forge, makes the pressure head 8 in contact with the surface of the flange forge and applies a preset pressure, further confirms the physical properties of the defect area through pressure feedback, and resets the pressure head 8 after re-inspection is completed.

[0026] The marking mechanism is an inkjet marker 6 embedded in the bottom of the shell 3. In use, when the control module confirms that the flange forge has a defect and reaches a marking threshold, the inkjet marker 6 receives the signal of the control module, sprays marking ink to the defect position, forms an obvious mark, and facilitates subsequent identification and processing.

[0027] The top of the bottom plate 1 is further fixedly connected with a fixing seat 10, the fixing seat 10 is slidably connected with a mounting bracket 2 through guide columns 12, the side surface of the fixing seat 10 is fixedly connected with an electric push rod 1 1, the mounting bracket 2 is fixed on the output shaft of the electric push rod 1 1, and the defect detection module is installed at the top end of the mounting bracket 2.

[0028] In use, after the flange is fixedly installed to the rotating clamping mechanism, the electric push rod 11 works, and the output shaft thereof is extended and retracted to drive the mounting frame 2 to slide on the guide column 12 on the fixed base 10, so that the defect detection module at the top end of the mounting frame 2 is adjusted to move to a detection position.

[0029] In another embodiment, the generated surface crack density coefficient and the internal defect attenuation coefficient are comprehensively analyzed by the control module to generate an evaluation coefficient, the evaluation coefficient is compared with a pre-set reference threshold value, and the execution steps of controlling the working states of the force control execution mechanism and the marking mechanism according to the comparison result are as follows: Real-time detection: the eddy current sensor 4 collects voltage fluctuation values; the ultrasonic probe 5 collects echo amplitude values; Coefficient calculation: Surface crack density coefficient: characterizing the discrete degree of crack distribution, reflecting the intensity and depth unevenness of surface cracks, δ<0.15: voltage fluctuation is gentle, no crack or depth <0.02 mm; 0.15≤δ<0.4: local severe fluctuation, isolated micro-cracks (depth 0.02-0.1 mm); δ≥0.4: whole-week high-frequency oscillation, dense network cracks (depth >0.1 mm); The generation logic of the surface crack density coefficient is as follows: S1, the actual voltage fluctuation values at different time points within T time during defect detection are obtained by the eddy current sensor 4, and the actual voltage fluctuation value obtained at the ith time point within T time is denoted as, i=1, 2, 3, …, p, i is a positive integer; S2, the surface crack density coefficient is calculated, and the expression for calculation is: In the formula, is the average voltage fluctuation value within T time; p is the sampling number within T time.

[0030] Internal defect attenuation coefficient: quantifying the blocking rate of internal defects to ultrasonic energy, reflecting the size and density of pores / slag, α<5%: no or φ<0.3 mm isolated pores, ultrasonic wave diffraction (scattering loss can be ignored); 5%≤α<15%: φ0.3-1 mm pore group, multiple scattering leads to energy attenuation; α≥15%: slag / porosity (>1 mm) forms a shadow zone by ultrasonic wave total reflection; The generation logic of the internal defect attenuation coefficient is as follows: S1, the actual echo amplitude values at different positions during defect detection are obtained by the ultrasonic probe 5, and the actual echo amplitude value obtained at the jth position is denoted as, j is a positive integer; S2, the internal defect attenuation coefficient is calculated, and the expression for calculation is: In the formula, is the average amplitude of the complete area.

[0031] Evaluation coefficient: a dimensionless risk index that combines the surface crack threat and the internal defect severity; the control module dynamically weights and sums the surface crack density coefficient and the internal defect attenuation coefficient by preset weight coefficients, and performs formula analysis through the control module according to the formula: In the formula, w1 and w2 are weight coefficients (for example, w1=0.7 and w2=0.3, which are dynamically determined in combination with experimental data).

[0032] Dynamic adjustment: if R_df<0.3, normal conveying without marking; if 0.3≤R_df<0.6, the force control actuator is pressurized to 15N for re-inspection, and the suspicious area is marked; and if R_df≥0.6, the machine is immediately stopped to mark the defect position, and an audible and visual alarm is triggered.

[0033] The application also provides a flange forging defect detection method, which comprises the following steps: S1, fixing the flange forging on a rotary table; S2, starting an electric push rod to position the eddy current sensor and the ultrasonic probe at the bottom of the shell to the area to be inspected of the flange forging, starting motor two to drive the rotary table and the flange forging to rotate, and realizing omnidirectional scanning; S3, the eddy current sensor collects the surface voltage fluctuation value in real time, and the control module calculates the surface crack density coefficient; the ultrasonic probe collects the internal echo amplitude value in real time, and the control module calculates the internal defect attenuation coefficient; S4, the control module weights and fuses the surface crack density coefficient and the internal defect attenuation coefficient to generate the evaluation coefficient R_df; if R_df<0.3, it is determined to be qualified, the flange forging is conveyed without marking; if 0.3≤R_df<0.6, 15N pressure is applied to the defect area for re-inspection, and the suspicious area is marked; and if R_df≥0.6, the machine is immediately stopped, the defect position is marked, and an audible and visual alarm is triggered; S5, after the detection is completed, the flange forging is loosened and taken away.

[0034] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. A flange forging defect detection device, comprising a rotary clamping mechanism, a defect detection module, a force control execution mechanism, a marking mechanism and a control module, characterized in that, The defect detection module comprises an eddy current sensor (4) and an ultrasonic probe (5) embedded in the bottom of the shell (3), a force control actuator and a marking mechanism are also integrated on the shell (3), and the control module is installed in the electric control box (9); The eddy current sensor (4) is used for monitoring the voltage fluctuation value in real time and generating a surface crack density coefficient through the control module; The ultrasonic probe (5) is used for monitoring the echo amplitude value in real time and generating an internal defect attenuation coefficient through the control module; The control module performs comprehensive analysis on the generated surface crack density coefficient and internal defect attenuation coefficient to generate an evaluation coefficient, compares the evaluation coefficient with a pre-set reference threshold value, and controls the working state of the force control actuator and the marking mechanism according to the comparison result.

2. The flange forging defect detection apparatus according to claim 1, wherein The rotating clamping mechanism comprises a rotating table (13) rotatably connected to the top of the bottom plate (1), a motor one (14) fixedly connected inside the rotating table (13), a disc (15) connected to the output shaft of the motor one (14), a plurality of arc-shaped push blocks (16) arranged in an annular array and fixedly connected to the top of the disc (15), a plurality of support plates (17) inserted into the circumferential outer wall of the rotating table (13) and corresponding to the push blocks (16), the end portions of the support plates (17) abutting against the arc surfaces of the push blocks (16), a plurality of guide columns (18) fixedly connected inside the rotating table (13) and penetrating through the support plates (17), springs (19) sleeved on the guide columns (18), the two ends of each spring (19) being fixedly connected with the support plate (17) and the guide column (18), respectively, a gear ring (20) fixedly sleeved on the rotating table (13), a gear (22) in meshing connection with the gear ring (20), and the gear (22) being mounted on the output shaft of a motor two (21) fixedly connected to the top of the bottom plate (1).

3. The flange forging defect detection apparatus according to claim 1, wherein The force control actuator comprises an electric cylinder (7) and a pressure head (8), the pressure head (8) is embedded in the bottom of the shell (3), and the pressure head (8) is fixed on the output shaft of the electric cylinder (7), and the electric cylinder (7) is fixed in the shell (3).

4. The flange forging defect detection apparatus according to claim 1, wherein The marking mechanism is an inkjet marker (6) embedded in the bottom of the shell (3).

5. The flange forging defect detection apparatus according to claim 1, wherein Further comprising a fixed seat (10) fixedly connected to the top of the bottom plate (1), an installation frame (2) slidably connected to the fixed seat (10) through guide columns (12), an electric push rod (11) fixedly connected to the side surface of the fixed seat (10), the installation frame (2) being fixed on the output shaft of the electric push rod (11), and the defect detection module being installed at the top end of the installation frame (2).

6. The flange forging defect detection apparatus according to claim 1, wherein The execution steps of the control module for controlling the working state of the force control actuator and the marking mechanism according to the comparison result are as follows: The eddy current sensor (4) collects the voltage fluctuation value; the ultrasonic probe (5) collects the echo amplitude value; the control module calculates the surface crack density coefficient, the internal defect attenuation coefficient and the evaluation coefficient R_df; if R_df<0.3: normal conveying, no marking; if 0.3≤R_df<0.6: the force control actuator is pressurized to 15N for re-inspection, and the suspicious area is marked; R_df≥0.6: immediately stop marking the defect position, and sound and light alarm.

7. The flange forging defect detection apparatus according to claim 1, wherein The generation logic of the surface crack density coefficient is: Based on the voltage fluctuation value sequence collected by the eddy current sensor (4) within T time, the discrete degree of the sequence relative to the average voltage fluctuation value is calculated.

8. The flange forging defect detection apparatus according to claim 1, wherein The generation logic of the internal defect attenuation coefficient is: Based on the echo amplitude values collected by the ultrasonic probe (5) at each position, the deviation percentage of the minimum amplitude value from the average amplitude of the complete area is calculated.

9. The flange forging defect detection apparatus according to claim 1, wherein The generation logic of the evaluation coefficient is: The control module dynamically weights and sums the surface crack density coefficient and the internal defect attenuation coefficient by a preset weight coefficient.

10. A method of detecting defects in a flange forging, characterized by, The method comprises the following steps: S1, fixing the flange forging on the rotary table; S2, starting the electric push rod to position the eddy current sensor and the ultrasonic probe at the bottom of the shell to the flange forging area to be detected, starting the motor two to drive the rotary table and the flange forging to rotate to realize omnidirectional scanning; S3, the eddy current sensor collects the surface voltage fluctuation value in real time, and the control module calculates the surface crack density coefficient; the ultrasonic probe collects the internal echo amplitude value in real time, and the control module calculates the internal defect attenuation coefficient; S4, the control module weights and fuses the surface crack density coefficient and the internal defect attenuation coefficient to generate the evaluation coefficient R_df; if R_df<0.3, it is determined to be qualified, the flange forging is conveyed and not marked; if 0.3≤R_df<0.6, 15N pressure is applied to the defect area for re-inspection, and the suspicious area is marked; if R_df≥0.6, stop immediately, mark the defect position, and trigger the sound and light alarm; S5, after the detection is completed, the flange forging is loosened and taken away.

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