Rolling processing equipment for high-strength cobalt-based alloy

Abstract

The invention belongs to the technical field of cobalt-based alloy machining, and particularly relates to high-strength cobalt-based alloy rolling machining equipment which comprises a rack and a cooling system, an upper roller and a lower roller are installed on the rack, one end of the rack is fixedly connected with a first motor, and the first motor is connected with the end of the lower roller through a reduction gearbox; and the other end of the lower roller is mounted on the bearing seat. The device further comprises a thickness acquisition module and a stress acquisition module. The thickness acquisition module and the stress acquisition module are used for monitoring the thickness and rolling pressure fluctuation of a rolled plate in real time, the control module is used for generating a corresponding fluctuation coefficient, and the thickness fluctuation coefficient and the stress fluctuation coefficient are comprehensively analyzed to generate an evaluation coefficient; and the roller spacing, the rolling speed and the working state of a cooling system are dynamically adjusted according to the evaluation result, so that the rolling process can adapt to material characteristics and working condition changes, the thickness uniformity of rolled plates is effectively improved, and the adverse effect caused by abnormal fluctuation of rolling pressure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cobalt-based alloy processing, in particular to rolling processing equipment for high-strength cobalt-based alloys. Background Art

[0002] Cobalt-based alloys are common metal alloys with numerous uses in daily life. To meet their specific needs, cobalt-based alloys are typically produced from a blank and then rolled into thin plates or sheets using two sets of fixed rollers in a conventional rolling mill.

[0003] During the rolling process of high-strength cobalt-based alloys, due to their high material strength and poor plasticity, extremely high rolling accuracy and stability are required. Traditional rolling processing equipment can usually only achieve basic rolling actions, and the working state of the cooling system is mostly fixed and cannot be dynamically adjusted according to the actual situation during the rolling process. This can easily lead to improper temperature control in the rolling zone, thereby affecting the rolling quality of the cobalt-based alloy. These problems make traditional equipment often have defects such as uneven plate thickness and internal stress concentration when processing high-strength cobalt-based alloys, making it difficult to meet the needs of high-quality rolling. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a rolling processing equipment for high-strength cobalt-based alloy.

[0005] The present invention proposes a high-strength cobalt-based alloy rolling processing equipment, including a frame and a cooling system, wherein an upper roller and a lower roller are installed on the frame, and the spacing between the upper roller and the lower roller is adjustable, one end of the frame is fixedly connected to a motor 1, and the motor 1 is connected to the end of the lower roller through a reduction box, and the other end of the lower roller is installed on the bearing seat, and the cooling system is used to cool the rolling zone, and also includes: a thickness acquisition module for real-time monitoring of the thickness of the plate after rolling, and generating a thickness fluctuation coefficient through a control module; a stress acquisition module for real-time monitoring of the rolling pressure fluctuation, and generating a stress fluctuation coefficient through a control module; the control module performs a comprehensive analysis on the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient, and compares the evaluation coefficient with a preset reference threshold value The comparison is carried out, and the spacing between the spinning rollers, the rolling speed and the working state of the cooling system are controlled according to the comparison results; the high-strength cobalt-based alloy plate is rolled between the upper roller and the lower roller, and the motor drives the lower roller to rotate through the reduction box, and cooperates with the upper roller to complete the rolling; the thickness acquisition module monitors the thickness of the rolled plate in real time, transmits the data to the control module and generates a thickness fluctuation coefficient, and the stress acquisition module monitors the pressure fluctuation during the rolling process in real time, transmits the data to the control module and generates a stress fluctuation coefficient; the control module conducts a comprehensive analysis of the thickness fluctuation coefficient and the stress fluctuation coefficient to generate an evaluation coefficient. When the evaluation coefficient exceeds the preset reference threshold, the control module adjusts the spacing between the upper roller and the lower roller, the rolling speed and the working state of the cooling system accordingly to ensure the rolling quality.

[0006] Preferably, a slide groove is provided on both sides of the frame, a slider is slidably connected in the slide groove, and the upper roller is rotatably connected between the two sliders. Screws that are threadably connected to the corresponding sliders are also rotatably connected on both sides of the frame, and synchronous wheels are fixed on the top ends of the screws. The two synchronous wheels are connected by a synchronous belt. Motor 2 is installed on the top of the frame, and the output shaft of motor 2 is connected to the end of one of the screws; when the spacing between the upper roller and the lower roller needs to be adjusted, motor 2 is started and drives the screw connected thereto to rotate, and the screw drives the screw on the other side to rotate synchronously through the synchronous wheel and the synchronous belt. When the two screws rotate, the corresponding slider is driven to slide up and down in the slide groove, thereby driving the upper roller to move up and down, thereby realizing the adjustment of the spacing between the upper roller and the lower roller.

[0007] Preferably, the cooling system includes a metering pump, a nozzle, a water inlet pipe and a water outlet pipe. The metering pump is fixedly connected to the top of the frame, the water inlet pipe and the water outlet pipe are respectively connected to the two pipe joints of the metering pump, and the nozzle is connected to the bottom end of the water outlet pipe and faces the rolling area. When the cooling system is working, the cooling medium enters the metering pump through the water inlet pipe, the metering pump meters the cooling medium and then transports it to the nozzle through the water outlet pipe. The nozzle sprays the cooling medium into the rolling area to cool the upper roller, lower roller and cobalt-based alloy plate during the rolling process to control the rolling temperature.

[0008] Preferably, the thickness acquisition module is installed on the rolling outlet side, and the stress acquisition module is installed on the bottom of the bearing seat; during the rolling process, the thickness acquisition module located on the rolling outlet side detects the thickness of the cobalt-based alloy plate that has just been rolled in real time to ensure that the thickness information of the plate after rolling can be obtained in time; the stress acquisition module installed at the bottom of the bearing seat monitors the pressure fluctuations of the bearing seat when the lower roller is working in real time, and then reflects the changes in the rolling pressure. Both data are transmitted to the control module for processing.

[0009] Preferably, roller conveyors for conveying plates are fixedly connected to both sides of the frame; before rolling, the high-strength cobalt-based alloy plates are conveyed to the rolling area between the upper roller and the lower roller through the roller conveyor on one side of the frame; after rolling, the rolled plates are conveyed to the next process through the roller conveyor on the other side of the frame. The roller conveyor ensures the stability and continuity of the plate conveyance before and after rolling.

[0010] Preferably, the output end and input end of the thickness acquisition module and the output end and input end of the stress acquisition module are electrically connected to the input end and output end of the control module respectively, and the output end of the control module is electrically connected to the input end of motor one, the input end of motor two and the input end of the metering pump respectively.

[0011] Preferably, the control module controls the spacing between the spinning rollers, the rolling speed and the working state of the cooling system according to the comparison results in the following steps:

[0012] The thickness acquisition module collects the thickness of the plate after rolling; the stress acquisition module collects the rolling pressure fluctuation; the control module calculates the thickness fluctuation coefficient, stress fluctuation coefficient and evaluation coefficient Rp; if Rp<0.3: maintain the current rolling force and speed; if 0.3≤Rp<0.6: increase the coolant flow and fine-tune the roller spacing; if Rp≥0.6: trigger speed reduction and intervene to compensate for roller parallelism.

[0013] Preferably, the generation logic of the thickness fluctuation coefficient is:

[0014] The thickness acquisition module collects the thickness data of the rolled plate in real time, and generates a thickness fluctuation coefficient that characterizes the thickness uniformity based on the degree of deviation between the actual thickness and the average thickness at each moment within the time T.

[0015] Preferably, the generation logic of the stress fluctuation coefficient is:

[0016] The stress acquisition module collects rolling force data in real time, and generates a stress fluctuation coefficient that characterizes abnormal fluctuations in rolling force based on the degree of fluctuation between the actual rolling force and the average rolling force at each moment within time T.

[0017] Preferably, the generation logic of the evaluation coefficient is:

[0018] The thickness fluctuation coefficient and the stress fluctuation coefficient are dynamically weighted and fused through the thickness weight coefficient and the stress weight coefficient to generate an assessment coefficient for the comprehensive risk of the assessment system.

[0019] Compared with the prior art, the present invention provides a high-strength cobalt-based alloy rolling processing equipment, which has the following beneficial effects:

[0020] 1. A high-strength cobalt-based alloy rolling processing equipment, by setting up a thickness acquisition module and a stress acquisition module, can monitor the thickness of the rolled plate and the rolling pressure fluctuations in real time, and generate the corresponding fluctuation coefficient through the control module, realizing accurate perception of the key parameters of the rolling process. The control module comprehensively analyzes the thickness fluctuation coefficient and the stress fluctuation coefficient to generate an evaluation coefficient, and then dynamically adjusts the roller spacing, rolling speed and working state of the cooling system based on the evaluation results, so that the rolling process can adapt to changes in material properties and working conditions, effectively improving the thickness uniformity of the rolled plate and reducing the adverse effects of abnormal rolling pressure fluctuations.

[0021] 2. A high-strength cobalt-based alloy rolling processing equipment. The dynamic adjustment of the cooling system ensures that the temperature of the rolling zone is within a reasonable range, further guarantees the rolling quality of the high-strength cobalt-based alloy, and improves production stability and product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram from a first angle of a high-strength cobalt-based alloy rolling processing equipment proposed by the present invention;

[0023] Figure 2 This is a second perspective structural diagram of a high-strength cobalt-based alloy rolling processing equipment proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the installation structure of a stress acquisition module of a high-strength cobalt-based alloy rolling processing equipment proposed by the present invention;

[0025] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure at point A;

[0026] Figure 5 This is a system block diagram of a high-strength cobalt-based alloy rolling processing equipment proposed by the present invention.

[0027] In the figure: 1. Frame; 2. Upper roller; 3. Lower roller; 4. Roller conveyor; 5. Thickness acquisition module; 6. Stress acquisition module; 7. Control module; 8. Motor 1; 9. Reducer; 10. Chute; 11. Slider; 12. Screw; 13. Synchronous wheel; 14. Synchronous belt; 15. Motor 2; 16. Bearing seat; 17. Metering pump; 18. Nozzle; 19. Water inlet pipe; 20. Water outlet pipe. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0030] Reference Figure 1-Figure 5 A high-strength cobalt-based alloy rolling processing equipment includes a frame 1 and a cooling system. The frame 1 is mounted with an upper roller 2 and a lower roller 3, and the spacing between the upper roller 2 and the lower roller 3 is adjustable. One end of the frame 1 is fixedly connected to a motor 8, which is connected to the end of the lower roller 3 through a reduction gearbox 9. The other end of the lower roller 3 is mounted on a bearing seat 16. The cooling system is used to cool the rolling zone and also includes:

[0031] Thickness acquisition module 5, used to monitor the thickness of the rolled plate in real time and generate the thickness fluctuation coefficient through control module 7;

[0032] Stress acquisition module 6, used to monitor rolling pressure fluctuations in real time and generate stress fluctuation coefficients through control module 7;

[0033] The control module 7 performs a comprehensive analysis on the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient, compares the evaluation coefficient with a preset reference threshold, and controls the spinning roller spacing, rolling speed, and working state of the cooling system according to the comparison result;

[0034] It should be noted that the thickness acquisition module 5 can be a laser ranging sensor (KEYENCEL K-H series) or other equipment capable of real-time monitoring of the thickness of the rolled plate, the stress acquisition module 6 can be a piezoelectric force sensor (Kistler 9071A) or other equipment capable of real-time monitoring of rolling pressure fluctuations, and the control module 7 is an embedded controller (such as the STM32 series) with an integrated data fusion algorithm. Therefore, the thickness acquisition module 5, the stress acquisition module 6, and the control module 7 are not specifically limited here and can be selected according to actual needs.

[0035] During use, the high-strength cobalt-based alloy plate is rolled between the upper roller 2 and the lower roller 3. The motor 8 drives the lower roller 3 to rotate through the reduction box 9, and cooperates with the upper roller 2 to complete the rolling; the thickness acquisition module 5 monitors the thickness of the rolled plate in real time, transmits the data to the control module 7 and generates a thickness fluctuation coefficient, and the stress acquisition module 6 monitors the pressure fluctuation during the rolling process in real time, transmits the data to the control module 7 and generates a stress fluctuation coefficient; the control module 7 comprehensively analyzes the thickness fluctuation coefficient and the stress fluctuation coefficient to generate an evaluation coefficient. When the evaluation coefficient exceeds the preset reference threshold, the control module 7 adjusts the spacing between the upper roller 2 and the lower roller 3, the rolling speed and the working state of the cooling system accordingly to ensure the rolling quality.

[0036] Among them, a slide groove 10 is respectively opened on both sides of the frame 1, and a slider 11 is slidably connected in the slide groove 10. The upper roller 2 is rotatably connected between the two sliders 11. The two sides of the frame 1 are also rotatably connected with screws 12 threadedly connected to the corresponding sliders 11. The top of the screw 12 is fixedly sleeved with a synchronous wheel 13. The two synchronous wheels 13 are connected by a synchronous belt 14. A second motor 15 is installed on the top of the frame 1. The output shaft of the second motor 15 is connected to the end of one of the screws 12;

[0037] During use, when the distance between the upper roller 2 and the lower roller 3 needs to be adjusted, the motor 2 15 is started and drives the screw 12 connected to it to rotate, and the screw 12 drives the screw 12 on the other side to rotate synchronously through the synchronous wheel 13 and the synchronous belt 14. When the two screws 12 rotate, they drive the corresponding sliders 11 to slide up and down in the slide 10, thereby driving the upper roller 2 to move up and down, thereby adjusting the distance between the upper roller 2 and the lower roller 3.

[0038] The cooling system includes a metering pump 17, a nozzle 18, a water inlet pipe 19 and a water outlet pipe 20. The metering pump 17 is fixedly connected to the top of the frame 1. The water inlet pipe 19 and the water outlet pipe 20 are respectively connected to the two pipe joints of the metering pump 17. The nozzle 18 is connected to the bottom end of the water outlet pipe 20 and faces the rolling area.

[0039] During use, when the cooling system is working, the cooling medium enters the metering pump 17 through the water inlet pipe 19, the metering pump 17 meters the cooling medium and then transports it to the nozzle 18 through the water outlet pipe 20, and the nozzle 18 sprays the cooling medium into the rolling area to cool the upper roller 2, the lower roller 3 and the cobalt-based alloy plate during the rolling process to control the rolling temperature.

[0040] Among them, the thickness collection module 5 is installed on the rolling outlet side, and the stress collection module 6 is installed on the bottom of the bearing seat 16;

[0041] During use, during the rolling process, the thickness acquisition module 5 located on the rolling outlet side detects the thickness of the cobalt-based alloy plate that has just been rolled in real time to ensure that the thickness information of the rolled plate can be obtained in time; the stress acquisition module 6 installed at the bottom of the bearing seat 16 monitors the pressure fluctuations on the bearing seat 16 when the lower roller 3 is working in real time, and then reflects the changes in the rolling pressure. Both data are transmitted to the control module 7 for processing.

[0042] Furthermore, roller conveying frames 4 for conveying plates are fixedly connected to both sides of the frame 1;

[0043] During use, before rolling, the high-strength cobalt-based alloy plate is conveyed to the rolling area between the upper roller 2 and the lower roller 3 through the roller conveyor 4 on one side of the frame 1; after rolling is completed, the rolled plate is conveyed to the next process through the roller conveyor 4 on the other side of the frame 1. The roller conveyor 4 ensures the stability and continuity of the plate transportation before and after rolling.

[0044] Among them, the output end and input end of the thickness acquisition module 5 and the output end and input end of the stress acquisition module 6 are electrically connected to the input end and output end of the control module 7 respectively, and the output end of the control module 7 is electrically connected to the input end of motor 1 8, the input end of motor 2 15 and the input end of the metering pump 17 respectively.

[0045] In another embodiment, the control module 7 performs a comprehensive analysis on the generated thickness fluctuation coefficient and stress fluctuation coefficient to generate an evaluation coefficient, compares the evaluation coefficient with a preset reference threshold, and controls the spinning roller spacing, rolling speed, and operating state of the cooling system according to the comparison result. The execution steps are as follows:

[0046] Real-time detection: thickness acquisition module 5 acquires the thickness of the plate after rolling; stress acquisition module 6 acquires rolling pressure fluctuations;

[0047] Coefficient calculation:

[0048] Thickness Fluctuation Coefficient: This characterizes the thickness uniformity of the rolled plate and reflects the accuracy of roll gap control and material flow stability. Its core correlation is the work hardening sensitivity of cobalt-based alloys (e.g., Stellite 6K hardening index ≥ 0.35). Slight thickness fluctuations can amplify deformation during subsequent heat treatment.

[0049] Among them, the generation logic of thickness fluctuation coefficient is:

[0050] S1. Obtain the actual thickness of the plate at different times within a time period T after rolling through the thickness acquisition module 5. The actual thickness obtained at the i-th time within the time period T is calibrated as di, where i=1, 2, 3, ..., n, and i is a positive integer.

[0051] S2. Calculate the thickness fluctuation coefficient δt. The calculation expression is:

[0052]

[0053] Where, is the average thickness within time T; n is the number of sampling times within time T.

[0054] Stress Fluctuation Coefficient: Quantifies abnormal fluctuations in rolling force, revealing sudden changes in material deformation resistance or equipment mechanical failure. The core correlation is the low-temperature brittleness of cobalt-based alloys (elongation <15% below 800°C), and stress concentration directly leads to microcracks.

[0055] Among them, the generation logic of the stress fluctuation coefficient is:

[0056] S1. Obtain the actual rolling force of the plate at different times during the rolling process within a time period T through the stress acquisition module 6. The actual rolling force obtained at the jth time within the time period T is calibrated as Fj, where j = 1, 2, 3, ..., m, and j is a positive integer.

[0057] S2. Calculate the stress fluctuation coefficient σs. The calculation expression is:

[0058]

[0059] Where, is the average rolling force within time T, and m is the number of sampling times within time T.

[0060] Evaluation coefficient Rp: Integrates the full-dimensional risk indicators of thickness, stress, and temperature to determine the intensity and urgency of dynamic adjustment of rolling parameters. Dynamically weighted fusion of thickness fluctuation coefficient and stress fluctuation coefficient is performed through thickness weight coefficient and stress weight coefficient to generate an evaluation coefficient for comprehensive risk assessment system. Formula analysis is performed through control module 7 according to the formula:

[0061]

[0062] Where α and β are the thickness weight coefficient and stress thickness weight coefficient (such as α=0.7, β=0.3, the specific values ​​need to be dynamically determined in combination with experimental data and process requirements).

[0063] Dynamic adjustment: If Rp<0.3: maintain the current rolling force and speed to stabilize production; if 0.3≤Rp<0.6: increase the coolant flow by 10%, fine-tune the roll spacing by -5μm, and suppress temperature-induced stress concentration; if Rp≥0.6: trigger a 20% speed reduction and intervene to compensate for roll parallelism.

[0064] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rolling processing equipment for high-strength cobalt-based alloy, comprising a frame (1) and a cooling system, characterized in that: An upper roller (2) and a lower roller (3) are mounted on the frame (1), and the spacing between the upper roller (2) and the lower roller (3) is adjustable. One end of the frame (1) is fixedly connected to a motor (8), and the motor (8) is connected to the end of the lower roller (3) through a reduction gearbox (9). The other end of the lower roller (3) is mounted on a bearing seat (16). The cooling system is used to cool the rolling zone, and further includes: A thickness acquisition module (5) is used to monitor the thickness of the rolled plate in real time and generate a thickness fluctuation coefficient through a control module (7); A stress acquisition module (6) is used to monitor rolling pressure fluctuations in real time and generate a stress fluctuation coefficient through a control module (7); The generated thickness fluctuation coefficient and stress fluctuation coefficient are comprehensively analyzed by the control module (7) to generate an evaluation coefficient, which is compared with a preset reference threshold value, and the rolling roller spacing, rolling speed and working state of the cooling system are controlled according to the comparison result.

2. The rolling processing equipment for high-strength cobalt-based alloy according to claim 1, characterized in that: The frame (1) is provided with a slide groove (10) on both sides, a slider (11) is slidably connected in the slide groove (10), and the upper roller (2) is rotatably connected between the two sliders (11). The frame (1) is also rotatably connected with a screw rod (12) threadedly connected to the corresponding slider (11) on both sides, and a synchronous wheel (13) is fixedly sleeved on the top of the screw rod (12). The two synchronous wheels (13) are connected by a synchronous belt (14). A second motor (15) is installed on the top of the frame (1), and the output shaft of the second motor (15) is connected to the end of one of the screw rods (12).

3. The rolling processing equipment for high-strength cobalt-based alloy according to claim 2, characterized in that: The cooling system comprises a metering pump (17), a nozzle (18), a water inlet pipe (19) and a water outlet pipe (20), wherein the metering pump (17) is fixedly connected to the top of the frame (1), the water inlet pipe (19) and the water outlet pipe (20) are respectively connected to two pipe joints of the metering pump (17), and the nozzle (18) is connected to the bottom end of the water outlet pipe (20) and faces the rolling zone.

4. The rolling processing equipment for high-strength cobalt-based alloy according to claim 1, characterized in that: The thickness acquisition module (5) is installed on the rolling outlet side, and the stress acquisition module (6) is installed on the bottom of the bearing seat (16).

5. The rolling processing equipment for high-strength cobalt-based alloy according to claim 1, characterized in that: Roller conveying frames (4) for conveying plates are fixedly connected to both sides of the frame (1).

6. The high-strength cobalt-based alloy rolling processing equipment according to claim 3, characterized in that: The output end and input end of the thickness acquisition module (5) and the output end and input end of the stress acquisition module (6) are electrically connected to the input end and output end of the control module (7), respectively. The output end of the control module (7) is electrically connected to the input end of the motor 1 (8), the input end of the motor 2 (15) and the input end of the metering pump (17).

7. The high-strength cobalt-based alloy rolling processing equipment according to claim 1, characterized in that: The control module (7) controls the rolling roller spacing, rolling speed and the working state of the cooling system according to the comparison results in the following steps: The thickness acquisition module (5) acquires the thickness of the plate after rolling; the stress acquisition module (6) acquires the rolling pressure fluctuation; the control module (7) calculates the thickness fluctuation coefficient, the stress fluctuation coefficient and the evaluation coefficient Rp; if Rp < 0.3: maintain the current rolling force and speed to stabilize production; if 0.3 ≤ Rp < 0.6: increase the coolant flow and fine-tune the roller spacing; if Rp ≥ 0.6: trigger the speed reduction and intervene to compensate for the roller parallelism.

8. The high-strength cobalt-based alloy rolling processing equipment according to claim 1, characterized in that: The generation logic of the thickness fluctuation coefficient is: The thickness acquisition module (5) collects the thickness data of the rolled plate in real time, and generates a thickness fluctuation coefficient representing the thickness uniformity based on the degree of deviation between the actual thickness and the average thickness at each moment within the time T.

9. The high-strength cobalt-based alloy rolling processing equipment according to claim 1, characterized in that: The generation logic of the stress fluctuation coefficient is: The stress acquisition module (6) collects rolling force data in real time, and generates a stress fluctuation coefficient representing abnormal fluctuation of rolling force based on the fluctuation degree of the actual rolling force and the average rolling force at each moment within the time T.

10. The high-strength cobalt-based alloy rolling processing equipment according to claim 1, characterized in that: The generation logic of the evaluation coefficient is: The thickness fluctuation coefficient and the stress fluctuation coefficient are dynamically weighted and fused through the thickness weight coefficient and the stress weight coefficient to generate an assessment coefficient for the comprehensive risk of the assessment system.

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