A method of hot wire cutting of wind turbine blade core foam

Abstract

This invention discloses a method for hot-wire cutting of foam core material for wind turbine blades, including core material pretreatment, hot-wire cutting system calibration and debugging, adaptive matching of process parameters, flexible positioning and clamping, dynamic constant temperature follow-up cutting, synchronous air cooling and shaping, and post-processing and precision testing. This invention solves defects such as carbonization, slag adhesion, edge chipping, delamination, and stepped patterns on the cut surface. The finished product dimensional deviation is ≤±0.1mm, perpendicularity error is ≤0.03mm / m, and cut surface roughness Ra≤3.2μm, fully meeting the precision assembly and bonding requirements of high-end wind turbine blade core materials, effectively improving the interlayer bonding strength and overall structural stability of the blade. The entire process uses hot-wire melting cutting, generating no foam dust, eliminating dust pollution and safety hazards, and creating a green and environmentally friendly working environment. It eliminates the need for extensive substrate removal by cutting, reducing material loss to less than 2%. Compared to traditional milling processes, raw material utilization is increased by 6%-13%, significantly reducing production material costs.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade processing technology, and in particular to a method for hot-wire cutting of foam core material for wind turbine blades. Background Technology

[0002] Currently, the large-scale processing technology for wind turbine foam core materials in the industry is mainly divided into two categories: mechanical cutting and traditional hot-wire melting cutting. Both have significant technical defects and are difficult to adapt to the precision processing requirements of high-end wind turbine blades. Among them, mechanical milling uses CNC milling cutters for high-speed cutting and forming, which generates a large amount of ultrafine foam dust during the processing. This not only seriously pollutes the workshop production environment and endangers the respiratory health of operators, but also poses a dust explosion safety hazard. At the same time, the cutting of hard milling cutters directly squeezes and tears the microporous structure of foam, which can easily cause edge chipping, delamination, and surface micropore collapse of the core material. The material loss rate is as high as 8%-15%. When processing complex irregular curved surface structures, the forming accuracy is poor, the surface smoothness is insufficient, the subsequent manual trimming workload is large, and the production efficiency is extremely low, which cannot meet the needs of mass production with high precision.

[0003] Traditional hot-wire cutting utilizes a hot wire to melt foam at high temperatures for dust-free cutting. Compared to mechanical milling, it offers advantages such as lower wear and no dust. However, current technology suffers from low maturity and poor control precision, exhibiting several shortcomings: First, the lack of closed-loop constant temperature control means the hot wire temperature is highly susceptible to voltage fluctuations, ambient temperature, and hot wire aging, resulting in severe temperature drift. Excessive temperature leads to large-area carbonization and molten slag on the cut surface, while insufficient temperature results in incomplete cutting, foam tearing, and edge deformation. Second, the hot wire is prone to stretching and deformation under high-temperature operation, with continuously decreasing tension, leading to a decrease in wire straightness, significant vertical deviation in thick plate cutting, and inconsistent upper and lower cut dimensions. Third, the process parameters are singular and fixed, unable to adapt to different foam materials, thicknesses, and surface curvatures. Cutting irregular curved surfaces easily produces stepped patterns and ripples, resulting in poor molding consistency. Fourth, the lack of a professional shaping and cooling structure allows residual heat to accumulate continuously during cutting, causing localized thermal damage to the foam and severely affecting the core material's bonding performance. In summary, existing processing technologies cannot simultaneously achieve processing accuracy, surface quality, production efficiency, and yield. There is an urgent need for a new hot-wire cutting process for wind power foam core materials that is high-precision, low-damage, adaptive, and capable of stable mass production. Summary of the Invention

[0004] To address the aforementioned technical problems, a method for hot-wire cutting of foam core material for wind turbine blades is provided.

[0005] To achieve the above objectives, in a preferred embodiment of the present invention, it is configured to include:

[0006] S1. Core material pretreatment: Select the foam core material used in the sandwich structure of wind turbine blades, clean and micro-trim the surface of the foam core material to remove surface impurities and defects, and then place it in a constant temperature and humidity environment for static treatment to eliminate residual stress inside the foam core material and avoid deformation and springback after cutting.

[0007] S2. Calibration and debugging of hot wire cutting system: Build a matching CNC constant temperature hot wire cutting system, calibrate the straightness, perpendicularity and initial tension of the system's heating wire, establish a temperature closed-loop control mechanism to ensure that the working parameters of the heating wire are stable and controllable;

[0008] S3. Adaptive matching of process parameters: Based on the material, thickness and curvature characteristics of the cutting surface of the foam core material, the corresponding hot wire cutting temperature and feed speed are adaptively matched, and differentiated cutting parameter strategies are adopted for different processing conditions of flat plates, curved surfaces and thick plates.

[0009] S4. Flexible positioning and clamping: The pre-treated foam core material is positioned and fixed using a flexible clamping method to prevent the core material from shifting, vibrating, and undergoing micro-deformation during the cutting process. At the same time, a cutting clearance is reserved to ensure that the hot wire cutting trajectory is unobstructed and free from interference.

[0010] S5. Dynamic constant temperature follow-up cutting: Automatic cutting is completed by importing the preset cutting trajectory through the CNC system. During the cutting process, the hot wire temperature is calibrated in real time in a closed loop, the high temperature tension loss of the hot wire is dynamically compensated, and the feed speed is adaptively adjusted in real time according to the curvature of the cutting surface to ensure uniform and stable cutting.

[0011] S6. Synchronous air cooling and shaping: During the cutting process, the hot wire and the cutting seam area are simultaneously cooled and shaped by directional air cooling to quickly cool and shape the cutting surface, effectively suppressing high-temperature carbonization, melting slag and thermal damage defects on the cutting surface.

[0012] S7. Post-cut finishing and precision inspection: After the core material has been fully cooled and shaped, the edges of the core material are finely finished, and the dimensional accuracy, cut quality and forming perpendicularity of the finished product are inspected. Qualified workpieces are selected to complete the foam processing of the wind turbine blade core material.

[0013] In a preferred embodiment of the present invention, the foam core material in step S1 is any one of PVC closed-cell foam, PET high-strength foam, and PMI high-temperature resistant foam; the surface treatment method is high-pressure air gun blowing to remove dust, oil stain wiping combined with 800-grit ultra-fine sandpaper micro-grinding to level, only repairing surface defects and retaining the original microporous structure of the foam; the static environment temperature is 22-26℃, the relative humidity is 50%-65%, the static time is 2-4h, the core material is placed in a single layer suspended throughout the process, without compression or bending, completely eliminating molding stress and cutting residual stress.

[0014] In a preferred embodiment, the present invention can be further configured such that, in step S2, the cutting system includes a multi-axis CNC motion platform, a nickel-chromium alloy heating wire, a high-precision constant temperature control module, a real-time dynamic tension adjustment component, a dual-sided directional air-cooling component, and a high-speed data acquisition and storage module; the diameter of the nickel-chromium alloy heating wire is 0.2-0.5mm, and the effective cutting length covers the conventional processing dimensions of wind turbine core materials from 0-1200mm; after calibration, the overall straightness error of the heating wire is ≤0.02mm / m, and the initial tension is stable at 15-25N; the sampling response frequency of the temperature control module is ≥100Hz, a temperature-voltage linear closed-loop control model is established, the heating response time of the heating wire is ≤2s, and the cooling response time is ≤3s; a 3-5min no-load preheating zero-point calibration is performed before each operation to eliminate equipment start-up and shutdown errors.

[0015] In a preferred embodiment of the present invention, the multi-condition parameter matching method in step S3 is as follows: Flat straight edge cutting condition: PVC foam hot wire temperature 180-200℃, feed speed 180-250mm / min; PET foam hot wire temperature 190-210℃, feed speed 160-220mm / min; PMI foam hot wire temperature 200-220℃, feed speed 150-200mm / min; Curved irregular shape cutting condition: Compared with the cutting parameters of the same material flat plate, the temperature is reduced by 20-30℃ and the feed speed is reduced to 80-150mm / min; Thick plate cutting condition: For foam core materials with a thickness ≥50mm, a segmented and graded temperature control cutting mode with gradient cooling from top to bottom is adopted.

[0016] In a preferred embodiment, the present invention can be further configured such that the segmented and graded temperature-controlled cutting mode is as follows: for thick foam core materials with a thickness of 50-100mm, the material is divided into three cutting areas along the thickness direction: upper section, middle section, and lower section. The cutting temperature of the upper 1 / 3 thickness is 200-220℃, the cutting temperature of the middle 1 / 3 thickness is 190-200℃, and the cutting temperature of the lower 1 / 3 thickness is 180-190℃. The feed speed is constant at 120mm / min throughout the process, and the temperature is gradually reduced from top to bottom to match the residual heat accumulation law of the hot wire from top to bottom.

[0017] In a preferred embodiment of the present invention, the cutting speed adjustment rules for curved irregular surfaces in step S5 are as follows: when the radius of curvature R ≤ 50 mm, the feed speed is 80-100 mm / min; when 50 mm < R ≤ 150 mm, the feed speed is 100-120 mm / min; when R > 150 mm, the feed speed is 120-150 mm / min; the temperature fluctuation of the hot wire is controlled within ±3℃ throughout the cutting process, and temperature acquisition and calibration are completed every 10 ms to dynamically compensate for tension loss in real time and eliminate stepped marks and ripple defects in curved surface cutting.

[0018] In a preferred embodiment of the present invention, step S6 is further configured such that a double-sided symmetrical oblique air-cooling method is adopted, with two sets of air-cooling nozzles respectively located on both sides of the hot wire, the nozzles and the hot wire maintaining an angle of 30-45°, and the air-cooling speed being constant at 3-6 m / s; the output cold air is room temperature dry dust-free air, with the temperature difference between the air and the workshop environment ≤2℃, avoiding microcracks and secondary internal stress caused by excessive temperature difference, and directionally carrying away residual heat and molten waste gas to achieve rapid shaping of the cut surface.

[0019] In a preferred embodiment of the present invention, in step S4, a multi-point flexible silicone clamping fixture is used to symmetrically fix the core material, and the clamping force is controlled at 5-10N to avoid the collapse of foam micropores and local stress concentration caused by rigid extrusion; a uniform clearance of 2-5mm is reserved according to the hot wire cutting trajectory to prevent hot wire friction interference and cutting obstruction.

[0020] In a preferred embodiment of the present invention, the core material is allowed to cool naturally for 5-10 minutes in step S7. After cooling, the edge is lightly sanded with dust-free ultrafine sandpaper to remove minor burrs and flash. The finished product is qualified according to the following standards: surface roughness Ra≤3.2μm, overall size deviation≤±0.1mm, cutting perpendicularity error≤0.03mm / m, and the cut surface is free of carbonization layer, molten slag, chipping, delamination cracking, and micropore collapse defects.

[0021] In a preferred embodiment of the present invention, the cutting system is further configured to perform a 3-5 minute no-load preheating calibration procedure before each operation to complete the zero-point calibration of temperature and tension, eliminate equipment start-up and shutdown errors, and ensure batch processing consistency.

[0022] Beneficial effects: This invention provides a foam hot-wire cutting method for wind turbine blade core materials. Through three-parameter closed-loop control, gradient temperature control, and curvature-following cutting technology, it completely solves defects such as carbonization, slag adhesion, edge chipping, delamination, and stepped patterns on the cut surface. The finished product has a dimensional deviation of ≤±0.1mm, a perpendicularity error of ≤0.03mm / m, and a cut surface roughness Ra≤3.2μm, fully meeting the precision assembly and bonding requirements of high-end wind turbine blade core materials, effectively improving the interlayer bonding strength and overall structural stability of the blade. The entire process uses hot-wire melting cutting, eliminating the need for any foam powder. Dust generation is eliminated, thus removing dust pollution and safety hazards, resulting in a green and environmentally friendly working environment. No large amount of substrate cutting and removal is required, reducing material loss to less than 2%. Compared to traditional milling processes, raw material utilization is increased by 6%-13%, significantly reducing production material costs. It is compatible with three mainstream wind power foam core materials: PVC, PET, and PMI. It is suitable for various processing conditions, including thin flat plates, medium-thick plates, thick plates, conventional curved surfaces, and complex variable curvature shapes, comprehensively covering the processing needs of wind turbine blade core materials for different power levels onshore and offshore, demonstrating strong versatility and engineering adaptability. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0024] Example 1: Cutting of thin, flat PVC wind turbine foam core material

[0025] Core material grading and pretreatment: Select closed-cell PVC foam core material specifically for wind turbine blades, use a high-pressure air gun to blow away dust and debris from the surface, manually wipe away oil stains, and use 800-grit ultra-fine sandpaper to lightly polish the surface of tiny pits and protrusions, preserving the original microporous structure of the foam; lay the treated core material in a single layer suspended and flat, and place it in a constant temperature and humidity workshop at 24℃ and 55% relative humidity for 3 hours to fully eliminate internal stress and prevent subsequent deformation and rebound.

[0026] System closed-loop calibration: Select a 0.3mm diameter nickel-chromium alloy hot wire to correct the straightness and perpendicularity of the hot wire, with the error controlled within 0.02mm / m; adjust the dynamic tension component to stabilize the initial tension of the hot wire to 20N; start the temperature control module to complete the temperature-voltage closed-loop calibration, ensuring that the hot wire response speed meets the standard and the temperature sampling frequency is stable at 100Hz.

[0027] Parameter adaptive matching: For 30mm thick PVC flat foam, the matching process parameters are: hot wire constant temperature 195℃, constant feed speed 200mm / min.

[0028] Flexible clamping and fixing: The core material is clamped by a four-point symmetrical flexible tooling with a clamping force of 8N and a 3mm cutting clearance is reserved to ensure that the cutting trajectory is unobstructed and without vibration or deviation.

[0029] Dynamic constant temperature cutting: Import the linear cutting trajectory program, start the CNC system, the temperature control module calibrates the temperature every 10ms, and the temperature fluctuation throughout the process is ≤±2℃; the dynamic tension component compensates for the high temperature deformation of the hot wire in real time, keeps the straightness of the hot wire constant throughout the process, and completes the flat plate cutting at a uniform speed.

[0030] Synchronous air-cooling and shaping: The dual-sided air-cooling system is activated, with a cold air velocity of 4m / s and an angle of 40° between the nozzle and the hot wire. The dust-free air at room temperature continuously blows across the cutting area, rapidly cooling and shaping the cut surface to prevent carbonization and slag buildup.

[0031] Finishing and Inspection: After natural cooling for 8 minutes, the edges are lightly polished to remove minor burrs. After inspection, the overall dimensional deviation of the core material is 0.08mm, the cutting perpendicularity is 0.02mm / m, the surface roughness is Ra2.8μm, and there are no carbonization, chipping, or delamination defects. The processing quality is qualified.

[0032] Example 2: Cutting of Medium-Thickness Irregularly Shaped Curved PET Wind Power Foam Core Material

[0033] Core material grading and pretreatment: Select high-strength PET wind power foam core material, clean surface impurities, and then lightly grind and level it. Place it in a constant temperature workshop at 23℃ and 58% humidity for 2.5 hours, and then place it in a single layer suspended in the air to eliminate molding stress.

[0034] System closed-loop calibration: Install 0.35mm nickel-chromium alloy hot wire, adjust the hot wire tension to 18N, correct the straightness and perpendicularity, complete the temperature control closed-loop model calibration, and preheat the equipment under no-load for 3 minutes to stabilize the parameters.

[0035] Parameter adaptive matching: For PET material, 40mm thickness, and irregular curvature structure, the basic hot wire temperature is set to 180℃ and the basic feed speed is set to 120mm / min; the CNC system adjusts the speed in real time according to the curvature of the surface, and automatically adapts to the corresponding feed speed in the range of curvature radius of 50-150mm.

[0036] Flexible clamping and fixing: adopts a multi-point distributed flexible clamping method to adapt to the shape of irregular core materials, apply clamping force evenly, and avoid micro-vibration and deformation of core materials during curved surface cutting.

[0037] Dynamic constant temperature follow-up cutting: Import three-dimensional irregular cutting trajectory, constant temperature control throughout the process, and temperature fluctuation is stable within ±2℃; the feed speed is finely adjusted in real time according to the curvature of the surface, eliminating the stepped texture of the irregular cut surface, and the hot wire tension is constant throughout the process without attenuation.

[0038] Synchronous air cooling and shaping: The air cooling speed is 3.5m / s, and the cutting seam is symmetrically and obliquely blown to remove the molten waste gas and residual heat in time, ensuring that the cut surface is flat and shaped.

[0039] Finishing and Inspection: After cooling, the irregular curved surface is found to have excellent smoothness, no ripples or step marks, dimensional deviation of 0.09mm, no carbonized slag on the cut surface, and complete microporous structure, fully meeting the standards for the use of irregular core materials.

[0040] Example 3: Cutting of Thick PMI High-Temperature Resistant Wind Power Foam Core Material

[0041] Core material grading and pretreatment: PMI high-temperature resistant foam core material is selected, and after fine cleaning and polishing, it is placed in a constant temperature workshop at 25℃ and 52% humidity for 4 hours to fully release internal stress and ensure the structural stability of the thick core material.

[0042] System closed-loop calibration: 0.4mm thickened nickel-chromium hot wire is selected to adapt to thick plate cutting conditions. The tension is adjusted to 22N to accurately correct the verticality of the hot wire and the temperature control system. Parameter calibration is completed after 5 minutes of no-load preheating.

[0043] Parameter adaptive matching: For 80mm thick PMI foam, a segmented gradient temperature control mode is adopted, with the upper 1 / 3 thickness temperature at 210℃, the middle 1 / 3 thickness temperature at 195℃, and the lower 1 / 3 thickness temperature at 185℃. The feed speed is constant at 120mm / min throughout the process, matching the residual heat accumulation law of the thick plate from top to bottom.

[0044] Clamping and fixing, dynamic constant temperature cutting, and synchronous air cooling and shaping: Six-point symmetrical flexible clamping is adopted to ensure the stability of the thick plate; three-parameter closed-loop control throughout the process, with a double-sided air cooling wind speed of 5m / s, provides efficient heat dissipation and shaping, solving the problem of uneven cutting quality of thick plates.

[0045] Trimming and Inspection: The inspection results show that the perpendicularity of the thick plate cutting is without deviation, the upper and lower cut dimensions are consistent, the cut surface is uniform and flat, without carbonization, delamination, or micro-cracks, and the dimensional deviation is 0.07mm, which fully meets the high-precision assembly requirements of large thick plate core materials.

[0046] It should be noted that in this article, relational terms such as first and second are used only to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities.

[0047] The examples above are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A hot-wire cutting method of wind turbine blade core foam, characterized in that, Includes the following steps: S1. Core material pretreatment: Select the foam core material used in the sandwich structure of wind turbine blades, clean and micro-trim the surface of the foam core material to remove surface impurities and defects, and then place it in a constant temperature and humidity environment for static treatment to eliminate residual stress inside the foam core material and avoid deformation and springback after cutting. S2. Calibration and debugging of hot wire cutting system: Build a matching CNC constant temperature hot wire cutting system, calibrate the straightness, perpendicularity and initial tension of the system's heating wire, establish a temperature closed-loop control mechanism to ensure that the working parameters of the heating wire are stable and controllable; S3. Adaptive matching of process parameters: Based on the material, thickness and curvature characteristics of the cutting surface of the foam core material, the corresponding hot wire cutting temperature and feed speed are adaptively matched, and differentiated cutting parameter strategies are adopted for different processing conditions of flat plates, curved surfaces and thick plates. S4. Flexible positioning and clamping: The pre-treated foam core material is positioned and fixed using a flexible clamping method to prevent the core material from shifting, vibrating, and undergoing micro-deformation during the cutting process. At the same time, a cutting clearance is reserved to ensure that the hot wire cutting trajectory is unobstructed and free from interference. S5. Dynamic constant temperature follow-up cutting: Automatic cutting is completed by importing the preset cutting trajectory through the CNC system. During the cutting process, the hot wire temperature is calibrated in real time in a closed loop, the high temperature tension loss of the hot wire is dynamically compensated, and the feed speed is adaptively adjusted in real time according to the curvature of the cutting surface to ensure uniform and stable cutting. S6. Synchronous air cooling and shaping: During the cutting process, the hot wire and the cutting seam area are simultaneously cooled and shaped by directional air cooling to quickly cool and shape the cutting surface, effectively suppressing high-temperature carbonization, melting slag and thermal damage defects on the cutting surface. S7. Post-cut finishing and precision inspection: After the core material has been fully cooled and shaped, the edges of the core material are finely finished, and the dimensional accuracy, cut quality and forming perpendicularity of the finished product are inspected. Qualified workpieces are selected to complete the foam processing of the wind turbine blade core material.

2. The method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S1, the foam core material is any one of PVC closed-cell foam, PET high-strength foam, and PMI high-temperature resistant foam; the surface treatment method is high-pressure air gun blowing to remove dust, oil stain wiping combined with 800-grit ultra-fine sandpaper micro-grinding to level, only repairing surface defects and retaining the original microporous structure of the foam; the static environment temperature is 22-26℃, the relative humidity is 50%-65%, the static time is 2-4 hours, the core material is placed in a single layer suspended throughout the process, without compression or bending, completely eliminating molding stress and cutting residual stress.

3. The method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S2, the cutting system includes a multi-axis CNC motion platform, a nickel-chromium alloy heating wire, a high-precision constant temperature control module, a real-time dynamic tension adjustment component, a dual-sided directional air-cooling component, and a high-speed data acquisition and storage module. The nickel-chromium alloy heating wire has a diameter of 0.2-0.5mm, and the effective cutting length covers the conventional processing dimensions of wind turbine core materials from 0-1200mm. After calibration, the overall straightness error of the heating wire is ≤0.02mm / m, and the initial tension is stable at 15-25N. The sampling response frequency of the temperature control module is ≥100Hz, and a linear closed-loop control model of temperature-voltage is established. The heating response time of the heating wire is ≤2s, and the cooling response time is ≤3s. Before each operation, a 3-5min no-load preheating zero-point calibration is performed to eliminate equipment start-up and shutdown errors.

4. The method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S3, the specific method for matching parameters under multiple working conditions is as follows: Flat straight edge cutting condition: PVC foam hot wire temperature 180-200℃, feed speed 180-250mm / min, PET foam hot wire temperature 190-210℃, feed speed 160-220mm / min, PMI foam hot wire temperature 200-220℃, feed speed 150-200mm / min; Curved and irregular shape cutting condition: Compared with the cutting parameters of the same material flat plate, the temperature is reduced by 20-30℃ and the feed speed is reduced to 80-150mm / min; Thick plate cutting condition: For foam core materials with a thickness ≥50mm, a segmented and graded temperature control cutting mode with gradient cooling from top to bottom is adopted.

5. A method for hot-wire cutting of foam core material for wind turbine blades according to claim 4, characterized in that, The segmented and graded temperature-controlled cutting mode is as follows: For thick foam core materials with a thickness of 50-100mm, the material is divided into three cutting areas along the thickness direction: upper section, middle section, and lower section. The cutting temperature for the upper 1 / 3 of the thickness is 200-220℃, the cutting temperature for the middle 1 / 3 of the thickness is 190-200℃, and the cutting temperature for the lower 1 / 3 of the thickness is 180-190℃. The feed speed is constant at 120mm / min throughout the process, and the temperature is gradually reduced from top to bottom to match the residual heat accumulation law of the hot wire from top to bottom.

6. The method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S5, the speed adjustment rules for curved irregular cutting are as follows: when the radius of curvature R≤50mm, the feed speed is 80-100mm / min; when 50mm<R≤150mm, the feed speed is 100-120mm / min; when R>150mm, the feed speed is 120-150mm / min. The temperature fluctuation of the hot wire is controlled within ±3℃ throughout the cutting process. Temperature acquisition and calibration are completed every 10ms to dynamically compensate for tension loss in real time and eliminate stepped marks and ripple defects in curved cutting.

7. The method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S6, a double-sided symmetrical oblique air-cooling method is adopted, with two sets of air-cooling nozzles set on both sides of the hot wire, maintaining an angle of 30-45° between the nozzles and the hot wire, and a constant air-cooling speed of 3-6 m / s; the output cold air is room temperature dry dust-free air, with a temperature difference of ≤2℃ between the air and the workshop environment, avoiding micro-cracks and secondary internal stress caused by excessive temperature difference, and directionally carrying away residual heat and molten waste gas to achieve rapid shaping of the cut surface.

8. The method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S4, a multi-point flexible silicone clamping fixture is used to symmetrically fix the core material, and the clamping force is controlled at 5-10N to avoid the collapse of foam micropores and local stress concentration caused by rigid extrusion; a uniform clearance of 2-5mm is reserved according to the hot wire cutting trajectory to prevent hot wire friction interference and cutting obstruction.

9. A method for hot-wire cutting of foam core material for wind turbine blades according to claim 1, characterized in that, In step S7, the core material is allowed to cool naturally for 5-10 minutes. After cooling, the edges are lightly sanded with dust-free ultrafine sandpaper to remove minor burrs and flash. The finished product qualification standards are: surface roughness Ra≤3.2μm, overall dimensional deviation≤±0.1mm, cutting perpendicularity error≤0.03mm / m, and no carbonized layer, no molten slag, no chipping, no delamination cracking, and no micropore collapse defects on the cut surface.

10. A method for hot-wire cutting of foam core material for wind turbine blades according to claim 3, characterized in that, Before each operation, the cutting system performs a 3-5 minute no-load preheating calibration procedure to complete the zero-point calibration of temperature and tension, eliminate equipment start-up and shutdown errors, and ensure batch processing consistency.