The magnetic abrasive finishing (MAF) process is the method by which permanent magnet fields or electromagnet fields are used to control abrasive particles. The abrasive particles are supplied between the north and south poles of magnets and can finish the workpiece surface as the workpiece rotates.

Titanium bar is a material with high hardness and excellent mechanical properties, so it has a much higher compression strength than other materials because it is popular in aviation and medical fields. Since the smooth surface of titanium is essential for aeronautical and medical applications, a magnetic polishing finishing process has been applied to achieve smooth surface finish.

In this paper, a titanium bar was used as a workpiece with a diameter of 3.0 ㎜ and a length of 50 ㎜. When a magnetic abrasive finishing (MAF) process is applied to finish the surface of the material, surface roughness, removal weight and diameter change were measured every 20 seconds at a total time of 120 seconds. The best experimental conditions in this paper were finalized in three methods for finishing.

First, the workpiece rotation speed is changed, the second is the change of the frequency, and the third is the grain size change of the diamond abrasive. First, I applied the difference in rotation speeds of 3,000 rpm, 10,000 rpm, 20,000 rpm and 25,000 rpm for 120 seconds. According to the optimum results, the optimum value of Ra was 0.04 ㎛ and the Ry value was 0.43 ㎛, which is the result obtained when rotating at 20,000 rpm for 120 seconds. The total removal weight of the workpiece by the abrasive was 0.00098 g and the diameter was reduced by 0.00382 ㎜, which was better than other rotation speeds.

Secondly, when diamond abrasives of various sizes of 0.5 ㎛, 3 ㎛, 6 ㎛ and 9 ㎛ were used, respectively. As a result, an optimum value of the surface roughness was obtained when the diamond paste having a particle size of 0.5 ㎛ was finished.

Thirdly, in this study, the surface roughness of 0, 4 and 12 Hz vibration was measured. It was found that the best result is obtained at the frequency of 12 hz and the better surface roughness can be obtained at the high frequency.

According results, it is shown that the surface of workpiece can be best improved at 20,000 rpm, 12 Hz and 0.5 ㎛ grain size of diamond abrasive to achieve smooth surface roughness of titanium.