Troubleshooting: Bend Cracking and Springback
故障排查：弯曲件开裂与回弹
标签：开裂, 回弹, 最小弯曲半径, 校正弯曲
弯曲外缘开裂多因弯曲半径过小或材料过硬——将相对弯曲半径 r/t 提高到 ≥1（紫铜）、≥1.5（黄铜）。回弹靠**校正弯曲**（凸模末端加压 5%–10% 过冲）或补偿模具角度（按回弹角 2°–5° 预偏）解决。开裂件需退火后重冲。
Edge cracking in bending usually comes from too small a radius or overly hard stock—raise the relative bend radius r/t to ≥1 (copper) or ≥1.5 (brass). Control springback with **bottoming** (5%–10% over-travel at punch tip) or by pre-biasing the die angle by the 2°–5° springback angle. Cracked parts must be annealed and re-stamped. ---