吊机伞齿轮轴发生断裂,通过化学成分分析、力学性能试验、金相检验、断口宏观检验与扫描电镜微观分析等检验,对吊机伞齿轮轴及轮轴座进行断裂分析。结果表明:伞齿轮轴断裂处以解理断裂为主;轴承座断口以沿晶脆性断裂为主。%Conical gear shaft of loop wheel machine was cracked. This failure analysis of it was made by chemical com- position, mechanical property test, metallographic test, macroeconomic analysis and SEM. The results show that fracture of conical gear shaft is cleavage fracture, and the fracture of shaft block is intercrystalline fracture.
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