Inspecting Stampings: Burrs, NDT & Fracture Bands
冲压件检测：毛刺、探伤与断面分析
标签：毛刺, 断面四区, 涡流探伤, 金相, 检测标准
冲压件三大例行检测：①毛刺高度——千分尺或投影仪测量，一般标准 ≤10% 料厚，接插件要求更严至 0.03 mm；②断面四区带分析——塌角、光亮带、断裂带、毛刺的占比是间隙是否合适的直接证据，光亮带 ≥1/3 料厚判合格，光亮带突降即间隙增大或刃口变钝；③表面裂纹——铜导电率高，涡流探伤需 100 kHz–1 MHz 专用高频探头。金相抽检每批 1 件看冲裁面加工硬化层（约 0.05–0.1 mm），折弯件尤为关键。
Three routine stamping inspections: (1) burr height by micrometer or projector — typically ≤10% of gauge, connector-grade parts to 0.03 mm; (2) fracture-band analysis — the rollover/burnish/fracture/burr split is direct evidence of clearance health; burnish ≥1/3 of thickness passes, a sudden drop means widened clearance or dull edges; (3) surface cracks — copper's high conductivity calls for eddy-current probes at 100 kHz–1 MHz. Metallographic sampling (one per batch) reads the 0.05–0.1 mm work-hardened rim on cut edges — critical for parts that bend later.