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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 전만수
- 발행연도
- 2017
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이 논문의 연구 히스토리 (5)
2017
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In this paper, study on the die fracture occurring in hot forging of an aluminum fixed scroll is conducted using finite element methods. The material is assumed rigid-visocoplastic or rigid-thermoviscoplastic and the dies are assumed rigid or elastic.
The effective stress and forging-directional stress component are examined, revealing that excessive bending stress in tension due to flow unbalance induced lateral force exerted on the warp leads to the die fracture. Note that the wrap behaves mechanically like a cantilever beam and that the peak value of bending stress occurs not at the final stroke when the forming load reaches its maximum value. On the contrary, the peak value of bending stress is achieved when the unbalanced material flow becomes critical, which is concluded as the instant of fracture occurrence.
The effects of numerical schemes on the bending stress including heat transfer and its related temperature as well as die elastic deformation are also examined, which may give forging process design engineers some insight about the finite element techniques, especially including heat transfer and die elastic deformation. It has been known that both die elastic deformation and heat transfer cause a little earlier unbalanced material flow near the fractured region, leading to prediction of a little earlier die fracture.
The effective stress and forging-directional stress component are examined, revealing that excessive bending stress in tension due to flow unbalance induced lateral force exerted on the warp leads to the die fracture. Note that the wrap behaves mechanically like a cantilever beam and that the peak value of bending stress occurs not at the final stroke when the forming load reaches its maximum value. On the contrary, the peak value of bending stress is achieved when the unbalanced material flow becomes critical, which is concluded as the instant of fracture occurrence.
The effects of numerical schemes on the bending stress including heat transfer and its related temperature as well as die elastic deformation are also examined, which may give forging process design engineers some insight about the finite element techniques, especially including heat transfer and die elastic deformation. It has been known that both die elastic deformation and heat transfer cause a little earlier unbalanced material flow near the fractured region, leading to prediction of a little earlier die fracture.
목차
Ⅰ. 서 론 11.1 연구배경 및 목적 1Ⅱ. 해석의 수식화 32.1 유동해석의 수식화 32.2 온도해석의 수식화 82.3 금형해석의 수식화 12Ⅲ. 고정스크롤의 열간 단조공정의 유한요소해석 153.1 금형의 파괴원인 분석 153.2 비등온 해석 253.3 금형 탄성변형 고려 해석 31Ⅳ. 결론 38참 고 문 헌 39
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