2024铝合金挤压型材拉弯回弹分析.

2024 aluminum alloy L section extrusion profile stretch bending structure parts are key components in aircraft panels floor and joint. Aiming at the stretch bending springback problems of this kind of structure part，a stretch bending and springback finite element model was established based on the displacement controlled clamp trajectory modeling method，and the influences of pre stretching, post stretching and friction coefficient on springback were analyzed. The significance of pre stretching, post stretching and friction coefficient to springback was studied by orthogonal experiments. The results show that increasing pre stretching or post stretching can reduce the radius springback ratio，the lubricant between extrusions with die reduces the radius springback ratio. The variance analysis of the orthogonal experiment shows that the post stretching and friction coefficient have significant influence on the experimental indexes at the levels of Fo. 2s (2,2). [ABSTRACT FROM AUTHOR]