采取宏观检验、化学成分分析、金相检验以及力学性能检验等方法对石料切割机主轴发生断裂的原因进行分析。结果表明:由于石料切割机主轴生产加工工序不当,造成石料切割机主轴抗拉强度等力学性能未达到设计要求,从而大大降低了主轴的抗疲劳强度,运行中在剪切应力和切向拉应力共同作用下,导致发生早期疲劳断裂。 The reasons of the fracture of the main shaft of the stone cutting machine were analyzed by macroscopic test, chemical composition analysis, metallographic examination and mechanical property test. The results show that the mechanical performance of the main shaft of the stone cutting machine does not meet the design requirements due to improper production and processing steps of the main shaft of the stone cutting machine, thereby greatly reducing the fatigue strength of the main shaft. During the operation, the shear stress and the tangential tensile stress Together, lead to early fatigue fracture.