在冷冲压工作中,直角弯曲件的最小弯曲直边高度h应大于弯曲半径r加上板厚t的2倍(图1),即h>r+2t。通常把h=r+2t称为最小弯曲高度。当h≤r+2t时,用一般的直角弯曲漠使工件直接成形很难做到。当要制作这类工件时,通常都是增大h,弯曲完后再加工到所需的尺寸。我们在加工这类工件时,受到了活页类工件(图2)弯曲模具结构的启发。在弯曲这类活页件时,需 In the cold stamping work, the minimum straight bend straight edge height h should be greater than the bend radius r plus two times the thickness t (Figure 1), that is h> r + 2t. Usually h = r + 2t is called the minimum bending height. When h ≤ r +2 t, with the general right-angle bending desert direct forming the workpiece is difficult to achieve. When it comes to making such workpieces, it is common to increase h and bend to the desired size. We were inspired by the bending die structure of loose-leaf workpieces (Figure 2) when machining such workpieces. Need to bend this type of loose-leaf document