Finishing characteristics of Inconel alloy 625 bars in ultra-precision magnetic abrasive finishing using CNC machine center

摘要

An ultra-precision magnetic abrasive finishing (UPMAF) process is an efficient mirror finishing technique. This research utilized the ultra-precision magnetic abrasive finishing technique to improve the accuracy of advanced material of Inconel alloy 625 cylindrical bars. The finishing technique employed flexible unbonded magnetic abrasive tools with neodymium permanent magnets (Nd-Fe-B), and components of the finishing procedure were installed with a five-dimensional computer numerical control (CNC) machining center. The surface accuracy and dimensional accuracy of Inconel alloy 625 bars were enhanced by the ultra-precision magnetic abrasive finishing technique with input parameters of workpiece rotational speed, work-piece feed rate, and magnetic abrasive grain size. After characterization with energy dispersive X-ray analysis (EDX), atomic force microscope (AFM), and a thermal imaging camera, we found that this ultra-precision magnetic polishing technology can improve surface roughness Ry of Inconel alloy 625 cylindrical bars from 2010 nm to 200 nm at a rotational speed of 12000 rpm, feed rate of 2000 mm/min, diamond abrasive grain size of 1 mu m, and flux density of 300 mT processing of 5 min.