Aluminum alloys are the light weight materials, they are commonly used in many industrial applications such as electronic, aerospace, automotive, and medical industry. Because they are used in these such applications. Therefore, their light weight and high surface quality are required. In this paper, the surface improvement round flat aluminum alloy using lapping finishing method was explored. In order to find the optimal condition, lapping parameters such as, rotational speeds, abrasive grain sizes of pad, processing times, and lapping oils were investigated in this study. The improvement in surface roughness was found to be highest with optimal condition at 200 rpm of rotational speed, 1 ㎛ abrasive grain size of pad, 0.5ml of light oil for 720 sec. By using the optimal condition, the initial surface roughness Ra of round flat aluminum alloy can be enhanced from 2.59㎛ to 0.02 ㎛. This can be concluded that the small CNC machine with lapping finishing method can be used to enhance the surface roughness of round flat aluminum alloy effectively.

The purpose of this paper was to provide the co-relation lapping conditions of a spectacle metal components. The main elements of lapping conditions were composed of rotation velocity, lapping time, graphite kinds, product quantity and faulty product ratio those were co-related and influenced at each other. The optimal working conditions of lapping were controled the each lapping conditions, mutual relations and reciprocal actions. It was studied the optimal lapping conditions those graphite kinds-rotation velocity-faulty product ratio, rotation velocity-lapping time, rotation velocity-product quantity. Based on these results, the optimal conditions were that the level of graphite was midiμm and rotation velocity was 40∼(60rpm.