INFLUENCE OF THE SURFACE QUALITY OF STAINLESS STEEL JIS 420 ON LAPPING PROCESS

This objective of research was studied the Influence of Lapping Process Parameters on JIS 420 Stainless Steel. Factorial experiment was applied to analyze the fouralumina 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 1.6 µm at 180 min resulted in the best average surface roughness (Ra) of 0.0992 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%.