弯曲件的弯曲部位开裂,在日常生产中是一种经常发生的现象。本文根据生产实践,对弯曲部位的开裂原因进行了分析,并对其弯曲件落料尺寸及几何形状提出了要求。有一零件(如图1),当我们按图2所示落料件进行弯曲时,即在图1的一、二、三处发生开裂。一处裂纹深度1毫米,宽度0.4毫米,断面呈波浪形。二处裂纹深度为1.2毫米,宽度0.5毫米,断面呈麻花形,原3毫米的厚度变成 Curved parts of the bending crack, in daily production is a frequent occurrence of the phenomenon. According to the production practice, this paper analyzes the reason of cracking in the bending part, and puts forward the requirements for the bending part blanking size and geometry. There is a part (Figure 1). When we bend the blanking part as shown in Figure 2, cracking occurs at the first, second and third position in Figure 1. A crack depth of 1 mm, a width of 0.4 mm, the section was wavy. Two cracks depth of 1.2 mm, width 0.5 mm, section was twist-shaped, the original 3 mm thickness becomes