IMPROVING OPTIMIZED THE SURFACE QUALITY OF STAINLESS STEEL JIS 440 ON LAPPING PROCESS

This objective of research was studied to study lapping process for achieving high quality alumina the surface quality of stainless steel JIS 440 on lapping process. Factorial experiment was applied to analyze the four-alumina powder size of 0.3 µm and nine-lapping time of 30, 60, 90, 120, 150, 180, 210, 240 and 270 min, respectively. In preparing of specimen surface roughness for experimental, was used the ratio between the alumina powder of 200 g, alumina powder lubricant of 150 ml and water of 1 l which has Five surface roughness values, Ra were then prepared: 0.4 μm, 0.8 μm, 1.2 μm, 1.6 μm and 2.0 μm, respectively. Alumina abrasive powder size of 0.3 µm at a surface roughness of Ra 0.8 µm at 30 min resulted in the best average surface roughness (Ra) of 0.0575 µm when considering the satisfaction value. (Desirability: D) with regard to statistical processing, it was found that the value was as high as 99.37% Correlation of surface quality with lapping parameters was established to achieve process optimization.