표제지
요약
목차
I. 서론 12
1.1. 연구 배경(필요성) 12
1.2. 연구동향 13
1.3. 연구목적 및 범위 14
II. 이론적 고찰 15
2.1. 밀링가공에서의 절삭력 모델 15
2.2. 엔드밀 특성 17
2.4.1. 엔드밀에 의한 절삭 17
2.4.2. 엔드밀의 형상 17
2.4.3. 인선의 수에 따른 엔드밀 선정 19
III. 실험 장치 구성 및 실험 방법 20
3.1. 실험장치 구성 20
3.1.1. 가공 장비 20
3.1.2. 실험소재 23
3.1.3. 사용공구 24
3.2. 실험방법 27
3.2.1. 실험 방법 27
3.2.2. 실험조건 및 변수 28
3.2.3. 분석 방법 31
IV. 실험 결과 및 고찰 35
4.1. 공구 형상 변화 및 가공물 기울기 변화와 가공방향에 따른 칩 형상 특성분석 35
4.2. 공구 형상 변화 및 가공물 기울기 변화와 가공방향에 따른 표면 거칠기 특성분석 39
4.3. 공구 형상 변화 및 가공물 기울기 변화와 가공방향에 따른 절삭력 특성분석 45
4.4. 공구 형상 변화 및 가공물 기울기 변화에 따른 절삭량 특성분석 55
V. 결론 58
참고문헌 60
Abstract 61
Table3-1. Specifications of the machining center 21
Table3-2. Experimental conditions 21
Table3-3. Mechanical properties of the workpiece 23
Table3-4. Chemical composition of AL6061-T6 24
Table3-5. The specifications of end mill 26
Table3-6. Parameters of cutting conditions 28
Table3-7. specification of tool dynamomete 32
Table3-8. specification of charge amplifier 33
Table3-9. specification o fanalog-digital converter 34
Fig.2-1. Comparison of cutting direction 15
Fig.2-2. Configuration of ball-end milling for upward slope machining direction 16
Fig.2-3. Ball-end mill cutting edge generation with edge discretization method 16
Fig.3-1. Configuration of vertical machining center (Doosan Infracore, Mynx 400) 20
Fig.3-2. Configuration of slope jig plate 22
Fig.3-3. Configuration of flat-end mill 24
Fig.3-4. Configuration of ball-end mill 25
Fig.3-5. Configuration of radius-end mill 25
Fig.3-6. Slope machining process of workpiece 29
Fig.3-7. Tool dynamometer set-up for cutting force measuremen 29
Fig.3-8. Configuration of cutting mode in milling proces 30
Fig.3-9. Experimental set-up for machining experiments 31
Fig.3-10. Piezo-electric type tool dynamometer 32
Fig.3-11. Configuration of multichannel charge amplifier(Kistler,5019A) 33
Fig.3-12. Analog-digital converter (PCI-MIO-16E) 34
Fig.4-1. Chip geometry obtained from flat endmilling 36
Fig.4-2. Chip geometry obtained from ball endmillin 37
Fig.4-3. Chip geometry obtained from radius endmilling 38
Fig.4-4. Comparison of average surface roughness(Ra) 40
Fig.4-5. Comparison of maximum surface roughness(Rmax) 41
Fig.4-6. Machined workpiece surface on flat-end milling 42
Fig.4-7. Machined workpiece surface on ball-end milling 43
Fig.4-8. Machined workpiece surface on radius-end milling 44
Fig.4-9. Comparison of average cutting force on down cut upward milling 47
Fig.4-10. Comparison of average cutting force on up cut downward milling 48
Fig.4-11. Comparison of maximum cutting force on down cut upward milling 49
Fig.4-12. Comparison of maximum cutting force on up cut downward milling 50
Fig.4-13. Comparison of dynamic cutting force deviation(max-min) on down cut upward milling 51
Fig.4-14. Comparison of dynamic cutting force deviation(max-min) on up cut downward milling 52
Fig.4-15. Comparison of average surface roughness(Ra) 53
Fig.4-16. Comparison of maximum surface roughness(Rq) 54
Fig.4-17. Comparison of machining area change with respect to workpiece inclination angle and end mill tool type 57