Optimization of parameters affecting the magnetic abrasive finishing process using response surface method

Magnetic Abrasive Finishing (MAF) is a nano-machining process; due to low machining temperature, this process is categorized as a cold forming process. Therefore, the machined surface is free from thermal damages such as micro cracks, phase changes, burnt area and etc. In this paper, the effects of machining parameters (machining gap, work piece rotational speed and abrasive particles’ type) on work piece surface roughness have been experimentally studied. To achieve this goal a series of experimental tests were conducted on a newly developed setup and workpiece surface roughness was measured. The results of experimental studies were then used to develop a mathematical model for work piece surface roughness using Response Surface Method (RSM). The results show that there is a good agreement between experimental results and model predictions. This model was then used to minimize workipece surface roughness. In the selected range of machining parameters the minimum value of surface roughness is achieved by workpiece rotational speed of 373.73 rpm, machining gap of 2 mm and using diamond particles as abrasive. In addition, it was shown that abrasive particles’ type is the most affecting parameter on workpiece surface roughness. Furthermore, Microscopic results of surface tissue specimens, Shows that magnetic abrasive finishing process the direction and grooves resulting from the grinding process have significantly eliminated and as well as a super-polishing and uniformity surface finish like a mirror to a range of 0.207 µm is obtained.