| 马国军,高俊福,郭峰,谭鑫,吴承伟.压缩机主轴-叶轮摩擦性能及过盈装配主轴弯曲变形研究[J].,2015,55(6):575-581 |
| 压缩机主轴-叶轮摩擦性能及过盈装配主轴弯曲变形研究 |
| Study of frictional properties of compressor shaft and impellor as well as bending deformation of shaft in interference fit |
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| DOI：10.7511/dllgxb201506003 |
| 中文关键词: 压缩机 主轴弯曲变形 过盈装配 摩擦因数 |
| 英文关键词: compressor bending deformation of shaft interference fit friction factor |
| 基金项目:“九七三”国家重点基础研究发展计划资助项目(2011CB706504)；沈鼓-大工重大科研发展基金资助项目；中央高校基本科研业务费专项资金资助项目(DUT15QY18). |
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| 中文摘要: |
| 通过实验测量了压缩机主轴材料(40NiCrMo7)和叶轮材料(FV520B)的摩擦因数，其值在0.12~0.25，具体大小与法向接触压力和表面粗糙度有关．结果表明，法向接触压力只有大于约36 kN以后才会使摩擦因数轻微增大，而表面粗糙度对摩擦因数的影响更显著，也更复杂．摩擦因数随FV520B表面粗糙度增大整体会呈现增大趋势，但却随着40NiCrMo7表面粗糙度的增大而减小，犁沟效应和微黏着区的产生是导致这种变化的原因．在此基础上，通过有限元计算分析了降温不均时摩擦因数和过盈量对压缩机主轴过盈装配时弯曲变形的影响．结果表明，降温不均是导致主轴过盈发生弯曲变形的重要诱因，而摩擦因数与过盈量对弯曲变形存在耦合影响．当摩擦因数保持恒定时，主轴弯曲变形会随着过盈量的增大呈现出先增大后减小的趋势．从另一角度来看，当过盈量保持恒定且小于某一临界值时，摩擦因数增大会导致主轴弯曲变形增大，但当过盈量大于该临界值后，随摩擦因数增大主轴弯曲变形反而会减小．对这种现象给出了定性的分析． |
| 英文摘要: |
| The friction factors of the impellor material (FV520B) and the shaft material (40NiCrMo7) are measured firstly. It is found that the value of friction factor ranges from 0.12 to 0.25, which is dependent on both the normal contact pressure and the surface roughness. The measuring results show that the friction factor will slightly increase with the normal contact pressure when its value is higher about 36 kN. However, the surface roughness has more important and more complicated influences on the friction factor than the normal contact pressure. Generally, the friction factor increases with the increasing roughness of the impeller materials FV520B, but decreases with the increasing roughness of the shaft materials 40NiCrMo7. This phenomenon is mainly induced by the plow effect and micro-adhesion effect of the contact area. Based on these findings, using finite element method, the effects of friction factor and magnitude of interference on the bending deformation of the compressor shaft in interference fit are studied when the cooling temperature field is inhomogeneous. Simulation results show that the inhomogeneous temperature field is one of the main causes for the bending deformation of the shaft, and that friction factor and magnitude of interference have coupling influence on the bending deformation. In such an inhomogeneous temperature field, the bending deformation increases firstly and then, decreases with the increasing interference if the friction factor is invariable. On the other hand, the bending deformation would increase with the increasing friction factor if the interference is smaller than a critical value. Whereas, when the interference is bigger than that critical value, the bending deformation would decrease with the increasing friction factor. A qualitative analysis is given for this phenomenon. |
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