표제지
목차
I. 서론 8
II. 기초이론 9
2.1. 절삭가공 9
2.2. 절삭공구 10
2.3. 절삭 방법 10
2.4. 엔드밀(Endmill) 11
2.4.1. 엔드밀의 형상 12
2.4.2. 헬릭스각(Helix angle) 12
2.4.3. 날수 12
2.4.4. 경사각(Rake angle) 13
2.4.4. 여유각(Clearance angle) 13
2.5. 절삭유 14
2.6. 표면 거칠기 16
2.6.1. 산술평균 거칠기(Ra) 17
2.6.2. 최대높이 거칠기(Ry) 18
2.6.3. 10점 평균 거칠기(Rz) 19
2.7. 표면 거칠기에 영향을 주는 인자 20
2.7.1. 칩 형상의 영향 20
2.7.2. 절삭깊이의 영향 20
2.7.3. 이송의 영향 20
2.7.4. 절삭속도의 영향 20
2.8. 조도 측정법 21
2.8.1. 비교 측정법 21
2.8.2. 직접 측정법 21
III. 절삭실험 장치 및 방법 22
3.1. 실험장치 22
3.2. 실험방법 27
IV. 실험 결과 및 고찰 32
4.1. 표면 거칠기 특성 32
4.2. 가공표면 특성 37
V. 결론 42
참고문헌 43
ABSTRACT 44
Table 1. Type of processing and cutting method 9
Table 2. Types and features of end mill 11
Table 3. Type and key features of cutting oil 15
Table 4. Selection of cutting oil by cutting type 15
Table 5. The specification of CNC lathe machine 23
Table 6. Dimensions of flat endmill 24
Table 7. Dimensions of round endmill 24
Table 8. Dimensions of ball endmill 24
Table 9. Chemical composition of aluminum alloy 7075 25
Table 10. Mechanical properties of aluminum alloy 7075 25
Table 11. Chemical composition of soluble cutting water 26
Table 12. Physical properties of soluble cutting water 26
Table 13. Cutting conditions 27
Table 14. Specification of surface roughness measuring instrument 29
Table 15. Specifications of optical microscope 31
Fig. 1. Comparison of cutting direction. 10
Fig. 2. Geometry of solid type endmill 13
Fig. 3. The surface structure after cutting 16
Fig. 4. The curve of arithmetic average roughness 17
Fig. 5. The curve of maximum height roughness 18
Fig. 6. The curve of ten point average roughness 19
Fig. 7. Shape of endmill 24
Fig. 8. Cutting process of workpiece by CNC lathe C-axis and turn-mill... 28
Fig. 9. Surface roughness measuring of workpiece 30
Fig. 10. Effect of turn-mail rotational speed on average surface roughness as... 33
Fig. 11. Effect of turn-mail rotational speed on average surface roughness as... 34
Fig. 12. Effect of turn-mail rotational speed on average surface roughness as... 35
Fig. 13. Effect of turn-mail rotational speed on average surface roughness as... 36
Fig. 14. Optical micrographs surface: turn-mill rotational speed 3000 rpm, piece... 38
Fig. 15. Optical micrographs surface: turn-mill rotational speed 3000 rpm, piece... 39
Fig. 16. Optical micrographs surface: turn-mill rotational speed 3000 rpm, piece... 40
Fig. 17. Optical micrographs surface: turnmill rotational speed 3000 rpm, piece... 41
Photo 1. CNC lathe machine 22
Photo 2. Surface roughness measuring instrument. 30
Photo 3. Optical microscope measuring instrument 31