在多种金属薄板圆孔翻边试验数据的统计分析中发现,极限翻边系数K_(min)与反映材料基本性能的组合参数r·n或r·δ(r—厚向异性指数,n—应变硬化指数,δ—延伸率)之间有极好的相关性,二者均可作为评价极限翻边性能的基本判据。在此基础上提出以K_(min)=1/(1+(1+r)δ)作为圆孔极限翻边系数的计算公式,计算值与试验数据基本一致。 In the statistical analysis of many kinds of metal flanging test data, it is found that the combination of the limit flanging coefficient K min and the composite parameters r n or r δ reflecting the basic properties of the material r- Strain Hardening Index, δ-Elongation), both of which can serve as the basic criterion for evaluating the ultimate flanging performance. On this basis, K_ (min) = 1 / (1 + (1 + r) δ) is taken as the calculation formula of the limiting flange number of the circular hole, and the calculated value is basically consistent with the experimental data.