In this study, the ultra-smooth surface of Inconel 625 workpieces were achieved by 40000-RPM grade magnetic abrasive polishing (MAP) process. This process created the high rotational speed of workpiece and the movement of magnetic pole to produce the polishing action of magnetic abrasive tools on the surface of Inconel 625 workpieces. The input parameters used in this experiment were selected as the rotational speed of workpiece (40000 rpm), movement of magnetic poles (Feed rate: 2 mm/sec), grain size of abrasive tool (PCD abrasive: 1- ㎛), magnetic poles (A-shape, B-shape, and C-shape) and the polishing times (0, 2, 4, 6, 8, 10, 12, 14 min). The results of this study showed that the smooth surface of Inconel 625 bar was achieved, which the surface roughness of Inconel 625 were significantly improved from 0.33 μm to 0.03 μm within 10 min of the polishing time via B-shape of magnetic poles. This can be confirmed that the 40000-RPM grade MAP processing method is an effective process to achieve high surface quality of Inconel 625 workpieces.

Abstract
1. Introduction
2. Experimental setup
3. Experimental conditions
4. Results and discussion
    4.1 Surface roughness of Inconel 625
    4.2 Surface quality of Inconel 625
5. Conclusions
Funding
References

• 행리다(Dept. of Mechanical Design Engineering) | Lida Heng
• 이상완(Dept. of Mechanical Design Engineering) | Sang Wan Lee
• 문상돈(Professor, Dept. of Mechanical Design Engineering and Energy Storage/Conversion Engineering of Graduate School, Jeonbuk National University, South Korea) | Sang Don Mun Corresponding author