空心轴断裂失效分析

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Abstract：Ahot rolling drum ofa certain model exhibited abnormal vibration during operation after 5 months of online service.Disassembly revealed fracture of the hollow shaft at the tie rod position within the drum. Failure analysis of the fractured hollw shaft was conducted through macroscopic inspection，scanning electron microscopy （SEM），chemical compositionanalysis，as wellas hardnesstesting，mechanical property evaluation，and metallographic examination.The results indicate that distinct fatigue striations were present on the fracture surface， confirming fatigue fracture as the failure mode.Both the mechanical properties and hardnessvalues of the hollow shaft failed to meet design requirements.The presence of substantial undisslved ferrite and non-metallic inclusions in the microstructure at the fracture zone were identified as the primary causes of fatigue initiation sites.

Keywords： hollow shaft; non-metallic inclusions; mechanical properties; undissolved ferrteKeywords： spring; fracture; fold; crack; fatigue fracture

1序言

空心轴作为卷筒的核心传动部件，在卷筒机构中起着连接和支撑的作用，负责将驱动装置（电动机、减速机）的转矩传递到卷筒的外表面，确保钢带或板材能够被稳定卷取或开卷。（剩余3976字）