造粒机组主齿轮箱输出齿轮轴断裂失效分析

doi:10.16578/j.issn.1004.2539.2023.09.021

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机械传动 ›› 2023, Vol. 47 ›› Issue (9) : 151-159. DOI: 10.16578/j.issn.1004.2539.2023.09.021

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造粒机组主齿轮箱输出齿轮轴断裂失效分析

郭鹏辉¹, 刘世军¹, 徐文博¹, 娄世宇¹, 窦小鹏¹, 禹文涛²

作者信息 +

Fracture Failure Analysis of the Output Gear Shaft for a Granulator Main Gearbox

Guo Penghui¹, Liu Shijun¹, Xu Wenbo¹, Lou Shiyu¹, Dou Xiaopeng¹, Yu Wentao²

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文章历史 +

摘要

某聚丙烯挤压造粒机组主齿轮箱输出齿轮轴运行过程中发生断裂，通过断口分析、理化检验和强度校核，探究了该齿轮轴断裂失效的原因。结果表明，由于对应螺杆轴断裂造成瞬时冲击，导致该齿轮轴出现早期微动撕裂缺陷；在转矩和弯矩的复合交变载荷作用下，萌生早期裂纹并沿轴颈处扩展；当齿轮轴的有效承载面积减小到无法承受正常工作产生的扭转力矩时，齿轮轴发生断裂。另外，齿轮轴颈退刀槽处易形成应力集中，也是开裂的诱因之一。

Abstract

The output gear shaft of the main gearbox for polypropylene granulator main gearbox breaks during operation.Fracture reasons of the output gear shaft are investigated through fracture analysis, physical and chemical inspection, and strength check.The results show that the output gear shaft has early fretting tear, due to instantaneous impact caused by fracture of the corresponding screw shaft.Under the compound alternating load of the torque and the bending moment, the early crack initiates and propagates along the journal.When the effective bearing area of the output gear shaft reduces to the critical point that it cannot withstand the torsional torque generated by normal operation, the fracture of the output gear shaft occurs.It is easy to form stress concentration at the cutter back groove of the output gear shaft journal, which is also one of the cracking inducement.

导出引用

郭鹏辉, 刘世军, 徐文博, 娄世宇, 窦小鹏, 禹文涛. 造粒机组主齿轮箱输出齿轮轴断裂失效分析[J]. 机械传动, 2023, 47(9): 151-159 https://doi.org/10.16578/j.issn.1004.2539.2023.09.021

Guo Penghui, Liu Shijun, Xu Wenbo, Lou Shiyu, Dou Xiaopeng, Yu Wentao. Fracture Failure Analysis of the Output Gear Shaft for a Granulator Main Gearbox[J]. Journal of Mechanical Transmission, 2023, 47(9): 151-159 https://doi.org/10.16578/j.issn.1004.2539.2023.09.021

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