Comparison of the Surface Roughness according to the Workpiece Materials of Turning Operations

The turning clearance angle changes the machining characteristics. In this study, three workpiece materials, machine structural carbon steel, chrome-molybdenum steel and stainless steel, were examined. The experiments revealed how the features of selected materials changed when they were processed with machining operation. To find the surface roughness of workpiece materials, the workpiece materials, which have a higher tensile strength, showed a much better surface roughness in the surface roughness tester. Moreover, the process feed rate was compared between 0.07 mm/rev and 0.10 mm/rev. When the process feed rate was 0.07 mm/rev, the surface roughness has superior results without reference to the quality of the materials. According to this research on the turning clearance angle, the best roughness value was observed when the quality of the materials were $0.9^{\circ}$, whereas the worst roughness was observed when quality of the materials was $0.3^{\circ}$.

선삭가공의 피삭재에 따른 표면거칠기의 비교 분석

선삭작업에서 가공 여유각 변경은 가공특성을 변화시킨다. 본 연구에서는 피삭재로 기계구조용탄소강, 크롬믈리브텐강, 스테인리스강을 선택하여 정해진 가공조건으로 재질들의 특색이 어떻게 변화하는지 나타내었다. 피삭재의 재질별 표면거칠기를 알아보기 위하여 촉침식 표면 거칠기 측정기로 측정한 결과 인장강도가 높은 피삭재가 표면거칠기 값이 좋게 나왔다. 또한, 가공 이송속도 0.07 mm/rev와 0.10 mm/rev를 비교하였을 경우, 0.07mm/rev일 때가 재질과 관계없이 표면거칠기가 매우 좋게 나타났다. 선삭 여유각 변경에 따른 표면거칠기를 종합하여 분석하여 보면 3가지 재질 모두 $0.9^{\circ}$일 때 가장 좋은 거칠기 값을 보였으며 $0.3^{\circ}$일 때 가장 나쁜 거칠기 값을 보였다.