热风循环风机轴断裂失效分析
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摘要
为了研究热风循环风机轴失效形式、影响因素和预防措施,改善相关金属零部件质量,提高设备安全性和可靠性。针对某铝合金热处理设备中的热风循环风机轴断裂失效问题,采用化学成分分析、力学性能测试、金相检验、SEM检验、有限元法等技术手段,分析了风机轴断裂失效的原因,并提出了针对性的预防与改进措施。结果表明,热风循环风机轴的断裂形式为低名义应力和轻微应力集中情况下的旋转弯曲疲劳断裂,维修时的焊接加工缺陷以及轴肩附近直径的阶梯变化,造成了不同程度的应力集中,降低了材料的疲劳寿命,最终导致了轴断裂失效。
In order to study the failure modes,influencing factors and preventive measures of hot air circulation fan shaft,improve quality of the relevant metal parts,and improve the equipment safety and reliability,details aiming at the fracture failure of a hot air circulation fan shaft in an aluminum alloy heat treatment furnace.The technical means,such as chemical composition analysis,mechanical property test,metallographic examination,SEM inspection,finite element method,were used to analyze the causes of shaft fracture failure.And the preventive and improvement measures were put forward.The results showed that the hot air circulation fan shaft fracture mode was the rotational bending fatigue fracture under the condition of low nominal stress and mild stress concentration.The welding defects during maintenance and the step change of diameter near the shoulder caused the different degree of stress concentration,reduced the fatigue life of materials and eventually led to the shaft fracture failure.
In order to study the failure modes,influencing factors and preventive measures of hot air circulation fan shaft,improve quality of the relevant metal parts,and improve the equipment safety and reliability,details aiming at the fracture failure of a hot air circulation fan shaft in an aluminum alloy heat treatment furnace.The technical means,such as chemical composition analysis,mechanical property test,metallographic examination,SEM inspection,finite element method,were used to analyze the causes of shaft fracture failure.And the preventive and improvement measures were put forward.The results showed that the hot air circulation fan shaft fracture mode was the rotational bending fatigue fracture under the condition of low nominal stress and mild stress concentration.The welding defects during maintenance and the step change of diameter near the shoulder caused the different degree of stress concentration,reduced the fatigue life of materials and eventually led to the shaft fracture failure.
引文
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