x i h u a U niversity Minimum flanging coefficient 极限翻边系数kmi 孔边缘临界开裂的最小翻边系数 To be determined by material properties, hole conditions, relative thickness, and punch shape. kmin取决于材料的性能、孔的状况、毛坯相对厚度、凸模工 作部分的形状等。③ Minimum flanging coefficient 极限翻边系数kmin 孔边缘临界开裂的最小翻边系数。 To be determined by material properties, hole conditions, relative thickness, and punch shape. kmin 取决于材料的性能、孔的状况、毛坯相对厚度、凸模工 作部分的形状等