Intelligent production empowers quality control of NdFeB magnets, substantially increasing the yield rate of qualified products.

Recently, leading industry enterprises such as Zhongke Sanhuan and Zhenghai Magnetic Material have accelerated the promotion of intelligent production transformation. By introducing AI visual inspection systems, IoT sensor networks, and digital twin technology, they have achieved full-process quality control of NdFeB magnets, with the yield rate of qualified products on some high-end product lines increasing from 72% to 91%. This is driving the industry to transition from scale expansion to quality and efficiency improvement.

Traditional NdFeB magnet production relies on manual sampling inspections, which are prone to batch defects due to issues such as uneven distribution of rare earth components and fluctuations in sintering temperatures. After intelligent transformation, enterprises have deployed laser spectrometers in the melting process to collect 300 sets of composition data per second. Combined with machine learning models, they can adjust the ratio of praseodymium-neodymium in real time, raising the composition pass rate to 99.2%. In the forming process, six-axis robots equipped with 3D vision sensors are used to accurately identify tiny cracks in the坯体 (green bodies), achieving a detection accuracy of 0.02mm and improving efficiency by 20 times compared to manual inspection.

In the critical sintering stage, the digital twin system constructs a virtual sintering furnace using over 500 temperature sensors, dynamically simulating the grain boundary diffusion process of the magnets. This stabilizes temperature control accuracy at ±1℃, enhancing the consistency of the magnets' coercivity by 40%. A corporate executive stated that the intelligent system can automatically record over 1,200 production parameters, forming a quality traceability blockchain. In case of any issues, the problematic process can be located within 30 seconds.

Currently, the intelligent transformation coverage rate among leading enterprises in the industry has exceeded 60%. According to a listed company's third-quarter financial report, its production costs for high-end magnets have decreased by 18%, while customer complaint rates have dropped by 75%. Industry insiders predict that with the popularization of 5G + Industrial Internet technology, the industry's average yield rate of qualified products is expected to exceed 90% by 2025, further promoting the application penetration of NdFeB magnets in high-end fields such as new energy vehicle motors.