Effect of injection molding process parameters on the structure and mechanical properties of PPS/NdFeB magnets

In this study, a series of injection-molded magnets with identical dimensions and good molding quality were prepared. The effects of injection temperature, injection pressure, and injection speed on the microstructure and mechanical properties of PPS/NdFeB magnets were systematically investigated using a controlled univariate method combined with orthogonal experimental design. The results indicate that as the temperature increases, the crushing force of the PPS/NdFeB magnet rises to a maximum of 320.5 N and then stabilizes. When the injection pressure is too low, the density of the magnet decreases, leading to poor mechanical properties. Higher injection pressure results in greater density and higher crushing force. The injection speed should be maintained at a moderate level; either excessively high or low speeds adversely affect magnet performance. Based on orthogonal experimental analysis, optimal preparation parameters-including injection temperature, pressure, and speed were determined, providing valuable guidance for industrial production.