薄板 spring back에 관한 硏究 = On the Spring Back of Sheet Metals

국문 초록 (Abstract)

薄板의 塑性굽힘 加工에서, 스프링 백은 아주 複雜하고 어려운 問題로 잘 알려져 있다.
本 論文에서는 스프링 백을 plane stress와 plane strain 理論으로 區分하여 解析하고 V型 다이와 펀치로서 굽힘 實驗을 하여 다음과 같은 結論을 얻었다.
1. 굽힘변형과정은 2種類의 形式으로 大別되며 제각기 서로 다른 스프링 백의 변형특성을 나타낸다.
2. 스프링 백은 굽힘 荷重에 影響을 받으며 그 程度는 R/t의 크기에 관계한다.
3. 理論解析에서 얻어진 結果와 實驗은 잘 일치한다.

다국어 초록 (Multilingual Abstract)

In this plastic bending of sheet Metals, spring back is a well-known phenomenon as a very complex and different problem. In this report, the author deals with experimentally the process of deformation in the plastic bending of sheet metals with the V-die and punch and effects of various factors on the spring back in the matter mentioned above.
The results obtained as follows:
ⅰ) the process of deformation in bending was divided into two main types, each of which had the respective change of spring back.
ⅱ) Spring back was mainly influenced by bending load, but the degree of its influence was depended on the ratio of the radius R at the extreme point of punch to the thickness t of sheet metals.
ⅲ) the results obtained in the theoretical analysis are well agreed with the experiments.

목차 (Table of Contents)

• Abstract = 127
• Ⅰ. 緖論 = 127
• Ⅱ. 理論解析 = 128
• 2-1 假定 = 128
• 2-2 Plane stress = 128
• 3. 實驗裝置 및 實驗方法 = 129
• 3-1 實驗裝置 = 129
• 3-2 實驗方法 = 130
• 3-3 試料 = 131
• 4. 實驗結果 및 考察 = 132
• 4-1 試料 두께의 影響 = 132
• 4-2 펀치의 曲率半徑과 Δθ관계 = 133
• 4-3 加壓力과 Δθ = 133
• 4-4 壓廷方向과 Δθ = 134
• 4-5 加壓時間의 영향 = 134
• 4-6 理論値와의 비교 = 134
• 5. 結論 = 135
• 要約 = 135
• 參考文獻 = 135