The optimal process was investigated in conditions of suitable polishing speed, pole arrangement and lubricant when inner titanium pipe polished up using magnetic abrasive finishing (MAF). And also the temperature effect of the magnetic abrasives was studied from a relative movement of abrasive particles and the titanium pipe.

The important feature of titanium pipe pieces is the lighter weight than iron about 60%. Mechanical properties are good for fatigue strength, fracture toughness, and the outstanding corrosion resistance to chlorine ion especially. The good mechanical features of titanium material provide various, for instance, cars, submersibles, petrochemical plants, nuclear, thermal, hydroelectric generator parts, including the aerospace industry as well as medical equipment, daily necessities, sporting and leisure equipment, etc. However, the material was the low heat conductivity, and so the polishing process is very difficult to perform due to the accumulation of heat to tool. It is valuable to improve the processing technology of titanium material, especially on the finishing process activate the industry applications.

All research experiments were proceeded and are done efficiently by using the Method of Experimental Design to decrease number of experiments which reduce time and cost of tests. I switch rotational speed by 300, 600, 900 and 1200 RPM to measure surface roughness and removal weight. This results show that the most efficient surface roughness is for the process with 900 RPM which showed the surface roughness, Rz 0.43㎛ and the most amount of removal weight is for the process with 1200 RPM. The second amount of removal weight is for the process with 900 RPM. The magnetic pole arrangement varied with the movement type of abrasive particles of MAF. This study used pole arrangement like N-S 90°, S-Single and N-S 180°. As results, the N-S 90° pole arrangement shows the most efficient surface roughness of Rz 0.43㎛ and it shows the larger amount of removal weight than the N-S 180° pole arrangement. From the various lubricants, the light oil has the most efficient finishing property with the surface roughness of Rz 0.43㎛, and also the most amount of removal weight. However, it is inadequate to polish titanium pipe for human body. Because the cheap light oil only uses for industrial purpose. So olive oil on vegetable oil shows which the similar surface roughness of Rz 0.43㎛ and furthermore it shows even better polishing property, which is good for human body.

the heat phenomenon during the finishing process of magnetic abrasives to film inner pipe was observed by using infrared camera. As results, macroscopic movement of abrasives showed circular motion. But microscopic movement of abrasives showed moving from the bottom to the top along the position formed from line of magnetic force. And the type of the abrasive''s movement is not that abrasives brush overall inner surface of pipe but abrasives polish specific area where occur high pressure according magnetic forces and centrifugal forces made by rotation of pipe. Also I expected that the higher temperature of abrasives oxidize inner titanium pipe, but it identified marginal oxidation of inner surface according polishing temperature. It is desired when polish titanium pipe by using MAF which show marked low temperature in the workpiece in comparison with general cutting processing makes high temperature. therefore, it is suitable when polish inner titanium pipe by using MAF.