Influences of Alumina Powder on Surface Roughness of Tool Steel Material SKD61 by Lapping Surface Technique

Abstract

This research was to study the Influences of alumina powder on surface roughness by lapping surface technique for tool steel material SKD61, factorial experimental design technique. were applied to analyze 4 sizes of alumina lapping powder, namely 0.05, 0.30, 1.00, 3.00 µm and 6 time periods for lapping, namely 30, 60, 90, 120, 150, 180 min, respectively. Specimen surface preparation for experiments the ratio between 400 ml of alumina lapping powder, 400 ml of alumina lapping lubricant and 2 l of clean water was used to adjust the surface of the experimental specimen with the average surface roughness (Ra).0.1–0.5 µm the best results regarding statistical analysis were found. The size of alumina lapping powder was 0.05 µm, and the finishing time was 30 min, resulting in the best average roughness (Ra) of 0.0544 µm. (Desirability: D) Regarding statistical processing, it was found that the value was as high as 87.99%.