표제지
목차
Abstract 8
제1장 서론 10
1.1. 연구 배경 10
1.2. 연구 목적 및 내용 13
제2장 연마재 워터젯 가공의 개념 14
2.1. 연마재 워터젯 가공시스템의 구조 14
2.2. 연마재 워터젯 가공 메커니즘 17
2.2.1. 연마재 워터젯 가공변수 19
제3장 워터젯 가공변수 및 소재 특성에 따른 가공성 분석 22
3.1. 워터젯 가공변수 및 가공 조건 선정 22
3.2. 워터젯 가공변수에 따른 난삭재의 피삭성 검토 24
3.2.1. 펌프압력에 따른 가공깊이 분석 24
3.2.2. 이송속도에 따른 가공깊이 분석 25
3.2.3. 연마재 유입량에 따른 가공깊이 분석 26
3.2.4. 이격거리에 따른 가공깊이 분석 29
3.3. 워터젯 가공변수에 따른 가공품질 평가 32
3.3.1. 연마제 충격각도 및 중첩비율에 따른 가공깊이 평가 32
제4장 난삭재 3D 워터젯 형상가공 특성평가 37
4.1. 가공조건-가공깊이 상호관계 분석을 통한 가공깊이 예측 37
4.2. 가공깊이 시뮬레이션 성능평가 44
4.3. 난삭재 3D 형상 워터젯 밀링 가공 성능평가 48
4.3.1. 워터젯 3D 형상 가공 시스템 구성 48
4.3.2. 워터젯 3D 형상 워터젯 밀링 가공 결과 비교 50
제5장 결론 55
참고문헌 57
Table 1. Material Properties 22
Table 2. AWJ Cutting Conditions 23
Table 3. AWJ Cutting Conditions by SOD Change 30
Table 4. #80 Abrasive Particle data 45
Table 5. AWJ Cutting Conditions of 3D Shape Machining 49
Table 6. AWJ 3D Shape Cutting Test Result 50
Fig. 1. Application of Hard-to-machine Materials 11
Fig. 2. Environment-friendly Processing Technology 12
Fig. 3. Types of Abrasive Waterjet 14
Fig. 4. Abrasive Waterjet Cutting System Layout 15
Fig. 5. Abrasive Waterjet Cutting Head Section View 16
Fig. 6. Diagram of AWJ Machining System 16
Fig. 7. AWJ Cutting Mechanism 17
Fig. 8. AWJ Cutting Mechanism 18
Fig. 9. Relationship of Pressure and Cutting Speed 19
Fig. 10. Quality level in accordance with SOD Change 20
Fig. 11. Comparison of Cutting Speed Change by Abrasive Mass... 21
Fig. 12. Abrasive Particle Size and Shape 21
Fig. 13. Comparison of Depth of Cut by Pump Pressure Change 24
Fig. 14. Comparison of Depth of Cut by Feed Rate Change 25
Fig. 15. Comparison of Depth of Cut by Abrasive Mass Flow Rate Change 26
Fig. 16. Specimen Shape of SUS 304 27
Fig. 17. Specimen Shape of Inconel 600 28
Fig. 18. Specimen Shape of Ti6Al4V 28
Fig. 19. Structure of Air-jet Flow Expansion 29
Fig. 20. Design of Plane Process Path 30
Fig. 21. Depth of Cut by SOD Change 31
Fig. 22. Characteristic of AWJ Impact angle and Undercut 32
Fig. 23. Set up for AWJ Test 33
Fig. 24. Comparison of Depth of Cut by Impact Angle and Overlap Ratio 34
Fig. 25. Comparison of Depth Deviation by Impact Angle and... 34
Fig. 26. Specimen Shape of Ti6Al4V at... 35
Fig. 27. Specimen Shape of Ti6Al4V at... 35
Fig. 28. Specimen Shape of Ti6Al4V at... 36
Fig. 29. Specimen Shape of Ti6Al4V at... 36
Fig. 30. Schematic Diagram of AWJ Cutting Modeling 41
Fig. 31. Waterjet Energy Distribution... 43
Fig. 32. Distribution of Abrasive Particles and Sheet of Abrasive Particles 44
Fig. 33. Experiment Result of 3D Profile Shape 46
Fig. 34. Simulation Result of 3D Profile Shape 46
Fig. 35. Comparison between Experiment and Simulation... 47
Fig. 36. Comparison between Experiment and Simulation... 47
Fig. 37. Set up for Robot based 3D Shape Cutting System 48
Fig. 38. 3D Shape Profile Design in according to Feed Rate 49
Fig. 39. Comparison of Depth of Cut in according Overlap Ratio 51
Fig. 40. Final 3D Shape Design 51
Fig. 41. Result of AWJ 3D Cutting at Overlap Ratio 30% 52
Fig. 42. 3D Shape of Ti6Vl4V Cutting at Overlap Ratio 30% 52
Fig. 43. Result of AWJ 3D Cutting at Overlap Ratio 50% 53
Fig. 44. 3D Shape of Ti6Al4V Cutting at Overlap Ratio 50% 53
Fig. 45. Result of AWJ 3D Cutting at Overlap Ratio 70% 54
Fig. 46. 3D Shape of Ti6Al4V Cutting at Overlap Ratio 70% 54