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CN-121992396-A - Automatic high-speed cladding method for TRT blade coating

CN121992396ACN 121992396 ACN121992396 ACN 121992396ACN-121992396-A

Abstract

The invention relates to the technical field of TRT blade coating cladding, and discloses an automatic high-speed cladding method of a TRT blade coating, which comprises the following steps of intelligent pretreatment of the surface of the TRT blade, preparation of a nano coating material, presetting of an electromagnetic field, ultrasonic auxiliary deposition, laser cladding strengthening and coating cladding post-treatment; the cladding effect of the TRT blade surface coating can be improved by the cladding method.

Inventors

  • GAO XIAOQIANG
  • ZHANG MINGLIN
  • LIU GUIWEN
  • WANG WENJIE

Assignees

  • 江苏华泓机电设备科技有限公司

Dates

Publication Date
20260508
Application Date
20260225

Claims (8)

  1. 1. An automatic high-speed cladding method of a TRT blade coating is characterized by comprising the following steps of: S1, intelligent preprocessing of the surface of a TRT blade, namely carrying a high-pressure water jet cleaning system by a robot, wherein the pressure is 100-200MPa, the flow is 20-30L/min, impurities on the surface of the blade are removed, then, an optical signal obtained from the surface of the TRT blade is converted into an electric signal by a CCD camera to generate an image ‌, and then, the information such as pixel distribution, brightness, color and the like is analyzed by an image processing system, so that whether defects, pollution or size deviation problems ‌ exist on the surface of an object are judged; s2, preparing a nano coating material, and selecting an oxide precursor And Placing the raw materials ‌ into a ball milling tank which is used for starting a plasma ball mill, adding graphite and a nitriding agent into the ball milling tank to promote a reaction ‌, starting the plasma ball mill, ‌ and ‌ in nitrogen, performing plasma discharge to generate high-energy particle bombardment and thermal effect, performing synergistic effect with mechanical vibration, refining particles and introducing lattice defects, performing ball milling for 1-40 hours, and then performing microwave-assisted drying to avoid powder agglomeration ‌; S3, presetting an electromagnetic field, and applying an axial magnetic field of 0.5T before spraying a coating material to enable alloy powder particles to be arranged along the magnetic field direction, so that deposition segregation is reduced; s4, ultrasonic wave assisted deposition, wherein 25kHz ultrasonic wave is synchronously applied by using an ultrasonic transducer in the laser cladding process, and bubbles in a molten pool are crushed through cavitation effect, so that the defect of air holes is eliminated; S5, laser cladding reinforcement, namely preheating a TRT blade by alternately outputting pulse and continuous laser, finishing cladding of a coating material by the continuous laser, monitoring the temperature of a molten pool in real time by a thermal infrared imager, and dynamically adjusting the laser power and the scanning speed to control the thickness error of the coating within +/-5 mu m; S6, coating cladding post-treatment, namely placing the coated blade in an induction heating device, quickly heating to 800-1000 ℃ through electromagnetic induction, then switching to a laser annealing mode, uniformly scanning the surface of the coating by using a high-energy laser beam to refine the coating structure, burying the coating inside by a thermocouple and monitoring the surface temperature in real time by an infrared thermometer to ensure that the temperature fluctuation range is strictly controlled within +/-10 ℃, and continuously maintaining the whole treatment process for 10-30 minutes ‌.
  2. 2. The method for automatically and rapidly cladding the TRT blade coating according to claim 1, wherein the nano coating material comprises the following components in percentage by mass, 10%-20%, 40-50%, 5-10% Of graphite and 10-20% of nitriding agent.
  3. 3. The method for automatically and high-speed cladding TRT blade coating according to claim 1, wherein the plasma ball mill adopts dielectric barrier discharge plasma, the voltage is 15kV, the current is 500-800kA, the purity of nitrogen filled in the ball mill tank is more than or equal to 99.99%, and the oxygen content is less than or equal to 50ppm.
  4. 4. The method for automated high-speed cladding of a TRT blade coating of claim 1, wherein said CCD camera is a 500 ten thousand pixel industrial-grade camera.
  5. 5. The method for automatically cladding a TRT blade coating at a high speed according to claim 1, wherein the axial magnetic field is generated by a permanent magnet array, the magnetic field uniformity error is less than or equal to 5%, and the magnetic field direction is perpendicular to the laser scanning direction.
  6. 6. The method for automatically cladding a TRT blade coating at a high speed according to claim 1, wherein the ultrasonic transducer has a frequency of 25kHz and a power density of 0.5-1.0W/cm < 2 >, ultrasonic waves and laser beams are synchronously scanned, and the scanning speed is matched with the laser cladding speed.
  7. 7. An automated high speed cladding process for TRT blade coating according to claim 1, wherein said pulsed laser power is 1-2kW, pulse width is 1-5ms, repetition rate is 50-100Hz, said continuous laser power is 3-5kW, and scanning speed is 50-100mm/s.
  8. 8. The method for automatically and high-speed cladding a TRT blade coating according to claim 1, wherein the induction heating device adopts an intermediate frequency induction coil with the frequency of 1-10kHz and the heating rate of 50-100 ℃ per second, and the laser annealing adopts a fiber laser with the wavelength of 1064nm, the power of 1-2kW and the scanning speed of 100-200mm per second.

Description

Automatic high-speed cladding method for TRT blade coating Technical Field The invention belongs to the technical field of TRT blade coating cladding, and particularly relates to an automatic high-speed cladding method of a TRT blade coating. Background The TRT blade is used as a key component of core equipment in the metallurgical industry, contains a large amount of dust and chloride ions in blast furnace gas, and long-term scouring can lead to thinning of the surface of the blade and increase of gaps, so that the working efficiency of the turbine is reduced. The coating is coated to form a compact protective layer, so that direct scouring damage is reduced, the long-term high-temperature, high-pressure and corrosive gas erosion is born, and the running efficiency and service life of equipment are directly determined by the surface coating performance. The traditional coating cladding process has obvious technical bottlenecks: 1. Pretreatment defects ‌ are that an oxide layer and microcracks on the surface of the blade are difficult to thoroughly remove by manual cleaning, so that the binding force of a coating is reduced, and the quality of a subsequent coating is influenced by conventional visual detection depending on manual judgment. 2. The material preparation limit ‌ is that the traditional ball milling method consumes longer time and is easy to introduce impurities, and the drying link adopts hot air drying, so that nano powder is agglomerated, and the uniformity of the coating is reduced. 3. The cladding process has the defects ‌ that when the magnetic field is preset to be absent, the deposition segregation rate of the alloy powder is high, and a local stress concentration zone is formed; 4. The post-treatment is insufficient ‌, the traditional annealing process adopts a resistance furnace for heating, the heating rate is low, the tissue refinement is insufficient, the temperature monitoring depends on a contact thermocouple, the response delay causes larger process fluctuation, and the compactness of the coating is affected. For this reason we propose an automated high-speed cladding method for TRT blade coatings. Disclosure of Invention The invention aims to provide an automatic high-speed cladding method of a TRT blade coating, which aims to improve the cladding effect of the TRT blade surface coating. The technical scheme adopted by the invention is as follows: an automatic high-speed cladding method of TRT blade coating, comprising the following steps: S1, intelligent preprocessing of the surface of a TRT blade, namely carrying a high-pressure water jet cleaning system by a robot, wherein the pressure is 100-200MPa, the flow is 20-30L/min, impurities on the surface of the blade are removed, then, an optical signal obtained from the surface of the TRT blade is converted into an electric signal by a CCD camera to generate an image ‌, and then, the information such as pixel distribution, brightness, color and the like is analyzed by an image processing system, so that whether defects, pollution or size deviation problems ‌ exist on the surface of an object are judged; s2, preparing a nano coating material, and selecting an oxide precursor AndPlacing the raw materials ‌ into a ball milling tank which is used for starting a plasma ball mill, adding graphite and a nitriding agent into the ball milling tank to promote a reaction ‌, starting the plasma ball mill, ‌ and ‌ in nitrogen, performing plasma discharge to generate high-energy particle bombardment and thermal effect, performing synergistic effect with mechanical vibration, refining particles and introducing lattice defects, performing ball milling for 1-40 hours, and then performing microwave-assisted drying to avoid powder agglomeration ‌; S3, presetting an electromagnetic field, and applying an axial magnetic field of 0.5T before spraying a coating material to enable alloy powder particles to be arranged along the magnetic field direction, so that deposition segregation is reduced; s4, ultrasonic wave assisted deposition, wherein 25kHz ultrasonic wave is synchronously applied by using an ultrasonic transducer in the laser cladding process, and bubbles in a molten pool are crushed through cavitation effect, so that the defect of air holes is eliminated; S5, laser cladding reinforcement, namely preheating a TRT blade by alternately outputting pulse and continuous laser, finishing cladding of a coating material by the continuous laser, monitoring the temperature of a molten pool in real time by a thermal infrared imager, and dynamically adjusting the laser power and the scanning speed to control the thickness error of the coating within +/-5 mu m; S6, coating cladding post-treatment, namely placing the coated blade in an induction heating device, quickly heating to 800-1000 ℃ through electromagnetic induction, then switching to a laser annealing mode, uniformly scanning the surface of the coating by using a high-energy laser beam to refine th