초록

초소성 성형/확산접합 성형용 장비시스템 및 금형설계 기술
초소성 성형/확산접합을 이용한 Multi-sheet 일체화 성형 Process 기술
SPF/DB 부품을 위한 설계기술 개발
실용화 부품 시제개발 및 시험 평가 및 성능평가 기술

Abstract ▼

This research presents an innovative manufacturing method to produce heavy titanium parts with superplastic forming and massive diffusion bonding of multi-sheets by low pressure of inert gas. From pre-sized multi-sheets of titanium, near net shape is obtained with this process so that significant we

This research presents an innovative manufacturing method to produce heavy titanium parts with superplastic forming and massive diffusion bonding of multi-sheets by low pressure of inert gas. From pre-sized multi-sheets of titanium, near net shape is obtained with this process so that significant weight and cost saving is possible. The adoption of superplastic characteristics intomanufacturing process makes many of aircraft components lighter and stiffer. In superplastic forming(SPF) process of sheet metals, one or more sheets of superplastic grade materials are heated and forced onto or into single surface tools by air pressure. One of the most important advantages of using SPF technology is the simplicity and economy in tooling. The most widely used SPF is blow-forming, in which a metal sheet is deformed due to the pressure difference of hydrostatic gas on both sides of the sheet. This massive diffusion bonding is different from conventional brazing or TLPDB(Transient Liquid Phase Diffusion Bonding), which use different metals with low melting temperature at bonding interface. Without including any other material or liquid phases in bonding process, the complex shape of components can be manufactured in bulk at solid-state with metallurgically homogeneous microstructure. The result shows that the manufacturing method with massive diffusion bonding of multi-sheets of superplastic Ti-6Al-4V alloy has been successfully with near net shaping of aerospace parts and structural integrity of the product was demonstrated.

목차 Contents

• 제 1 장 서론...12
• 제 1 절 재료의 특성 및 구성 방정식...18
• 제 2 장 국내외 기술개발 현황...22
• 제 1 절 해외의 기술 현황...22
• 제 2 절 국내의 기술 현황...36
• 제 3 장 연구개발수행 내용 및 결과...38
• 제 1 절 초소성성형/확산접합 고온 금형/압력제어 시스템 개발...38
• 제 2 절 티타늄 합금의 초소성성형/확산접합 기술 개발...85
• 제 3 절 공정 최적화 및 수치해석 프로그램 개발...270
• 제 4 절 샌드위치 일체화 구조물 개발...357
• 제 5 절 실험시제 축소모델 개발 및 성능평가...414
• 제 4 장 연구개발목표 달성도 및 대외기여도...533
• 제 5 장 연구개발결과의 활용계획...537
• 제 6 장 참고문헌...555
• 부록 : 초소성성형/확산접합 공정해석 프로그램 사용설명서...576