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Nomenclature 8

제1장 서론 9

1.1. 연구의 배경 9

1.2. 연구의 동향 11

1.3. 연구의 목적 11

1.4. 논문의 구성 12

제2장 기초이론 13

2.1. 절삭저항 13

제3장 복합공구대의 유한요소 모델 구축 15

3.1. 복합공구대의 3차원모델 구축 15

3.2. 유한요소 모델 구성 20

3.3. 하중 및 경계조건 22

제4장 복합공구대의 동적 안정성 해석 25

제5장 커빅 커플링 안정성 해석 29

5.1. 복합공구대 디스크 임계돌출거리 판단 29

5.2. 복합공구대 커빅 커플링 안정성 판단 43

제6장 결론 46

참고문헌 47

ABSTRACT 48

Table. 3.1. Number of node and element 21

Table. 3.2. Material properties of FE analysis model 21

Table. 3.3. Load conditions 23

Table. 4.1. Excitation frequency of indexing 25

Table. 4.2. Excitation frequency of driving 26

Table. 4.3. Natural frequency of mill turret 26

Fig. 1.1. Schematic of mill turret 10

Fig. 1.2. Distance of disk extrusion 10

Fig. 2.1. Resultant and three component of cutting resistances 13

Fig. 3.1. Cad model of 3PCC 15

Fig. 3.2. Fixed curvic coupling 16

Fig. 3.3. Turning curvic coupling 16

Fig. 3.4. Piston curvic coupling 16

Fig. 3.5. 3D model of mill turret 17

Fig. 3.6. Internal structure of mill turret 18

Fig. 3.7. Test model of mill turret 19

Fig. 3.8. FE analysis model 20

Fig. 3.9. Element type of FE analysis model 21

Fig. 3.10. Loads and boundary condition of FE analysis model 24

Fig. 4.1. Mode shape in each natural frequency 28

Fig. 5.1. Distance of disk extrusion 29

Fig. 5.2. Graph of Moment of the reaction force 30

Fig. 5.3. Angle direction of curvic coupling 31

Fig. 5.4. Reaction force of curvic coupling (228.5㎜) 32

Fig. 5.5. Reaction force of curvic coupling (238.5㎜) 32

Fig. 5.6. Reaction force of curvic coupling (248.5㎜) 33

Fig. 5.7. Reaction force of curvic coupling (258.5㎜) 33

Fig. 5.8. Reaction force of curvic coupling (268.5㎜) 34

Fig. 5.9. Reaction force of curvic coupling (278.5㎜) 34

Fig. 5.10. Reaction force of curvic coupling (288.5㎜) 35

Fig. 5.11. Reaction force of curvic coupling (298.5㎜) 35

Fig. 5.12. Reaction force of curvic coupling (308.5㎜) 36

Fig. 5.13. Reaction force of curvic coupling (318.5㎜) 36

Fig. 5.14. Reaction force of curvic coupling (328.5㎜) 37

Fig. 5.15. Reaction force of curvic coupling (338.5㎜) 37

Fig. 5.16. Reaction force of curvic coupling (348.5㎜) 38

Fig. 5.17. Reaction force of curvic coupling (358.5㎜) 38

Fig. 5.18. Reaction force of curvic coupling (368.5㎜) 39

Fig. 5.19. Reaction force of curvic coupling (378.5㎜) 39

Fig. 5.20. Reaction force of curvic coupling (388.5㎜) 40

Fig. 5.21. Reaction force of curvic coupling (398.5㎜) 40

Fig. 5.22. Reaction force of curvic coupling (408.5㎜) 41

Fig. 5.23. Reaction force of curvic coupling (418.5㎜) 41

Fig. 5.24. Reaction force of curvic coupling (428.5㎜) 42

Fig. 5.25. Graph of Moment of reaction force 43

Fig. 5.26. Stress distribution of curvic coupling(228.5㎜) 44

Fig. 5.27. Stress distribution of curvic coupling(408.5㎜) 45

Fig. 5.28. Stress distribution of curvic coupling(418.5㎜) 45

초록보기

Curvic coupling of mill turret should maintain disk weight and the cutting resistance which occurs the machining operation must have power transmission function. In order to improve machining operation range, distance to the disk must increase as much as possible. But moment is increased by the lack of bearing capacity of the curvic coupling. Increase of moment is the cause of vibration/noise and degradation of machining performance not only stability problem. In this study, finite element analysis model of mill turret is designed and considered the method of equation for finding distance to the disk by structural analysis of Ansys workbench. Through the considered method, ritical distance to the disk and stability of curvic coupling confirmed by increasing each value 10mm from 228.5mm. When distance to the disk is increased, of reaction force is increased. When distance to the disk is 408.5mm, of reaction force is bigger than the value of equation. Maximum stress of curvic coupling is 89.39MPa in 428.5mm. Analysis result stress confirmed less than tensil yield strength. Through analysis result, stability of curvic coupling is obtained.

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