This study investigates the fluid dynamic characteristics of a magnetorheological (MR) fluid injection system that integrates water jet and MR polishing technologies. The system functions by applying a magnetic field to MR fluid sprayed at high velocity from a nozzle, enabling precision surface finishing. Process variable parameters including injection pressure, velocity, and flow rate significantly influence the polishing performance. It was found that even with a strong and dense magnetic field, unstable injection leads to unpredictable process. Therefore, a fluid dynamic analysis was performed to determine the relationship between the injection variables and the pressure conditions occurring during injection. Based on this analysis, a hydraulic system capable of maintaining stable MR fluid injection was designed and evaluated. The findings of this study contribute to improving the reliability and efficiency of MR-based polishing processes through enhanced control of fluid dynamics.

• 이정원(Department Semiconductor Metrology of Korea Polytechnic colleges) | Jung-Won Lee Corresponding author