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研究单点渐进成形中坯料预切孔尺寸对圆柱孔翻边的可成形性的影响。翻边制造从45°到90°分为4个阶段,采用铝作为实验材料。孔尺寸对圆柱翻边的应力/应变分布有显著影响。随着孔尺寸的增大周向应变增大,翻边的壁厚增厚。同样地,随着孔尺寸的增大von Mises应力降低。而且,孔尺寸存在一个临界值(80 mm),当低于这个值时会产生严重的应力,从而导致板材断裂,圆柱翻边成形失败。随着孔尺寸的减小,且大于临界尺寸时,可成形性降低。结果表明,孔的临界尺寸为80 mm能使铝板在渐进孔成形中的可成形性能最大化。
The effect of the pre-cut hole size on the formability of cylindrical flange was investigated in single-point progressive forming. Flanging manufacturing from 45 ° to 90 ° is divided into four stages, using aluminum as the experimental material. The hole size has a significant effect on the stress / strain distribution of the cylinder flange. As the hole size increases, the circumferential strain increases, and the flange thickness increases. Likewise, the von Mises stress decreases with increasing pore size. Furthermore, there is a critical value (80 mm) for the hole size, below which severe stress can occur, causing the sheet to rupture and failure to form the flange. As pore size decreases, and greater than the critical size, formability decreases. The results show that the critical dimension of the hole of 80 mm can maximize the formability of the aluminum plate in progressive hole forming.