| 摘要: |
| 自锁螺母是航空航天领域常用的紧固件，防松性能是其重要的技术指标。目前缺少对收口量与防松性能之间关系的深入研究。建立了包含收口过程、装配过程和松动过程的自锁螺母防松性能仿真分析方法，并以航天MJ10规格自锁螺母为对象，进行收口量对自锁力矩和防松性能的影响研究。结果表明，收口量在0~300 μm时，自锁力矩随着收口量的增大而增大，即收口量越大自锁螺母的自锁力矩也越大。收口量不超过250 μm时，收口量越大预紧力衰减速率越小；收口量超过250 μm时，收口量越大预紧力衰减速率越大，即在一定范围内，收口量越大自锁螺母的防松性能也越好，但是当收口量超过某一值后，自锁螺母的防松性能反而下降，并非收口量和自锁力矩越大，自锁螺母的防松性能越好。可以为紧固件制造企业优化自锁螺母收口量提供参考。 |
| 关键词: 自锁螺母 收口量 自锁力矩 防松性能 |
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| Study on the Influence of Closing Amount on Self-Locking Torque and Anti-Locking Performance of Self-Locking Nu |
| PAN Xiang,YANG Yongzhen,SHI Yuhong,DING Xiaoyu |
| (Beijing Institute of Radio Measurement, Beijing 100854, China;Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China;School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China) |
| Abstract: |
| Self-locking nut is a common fastener in aerospace field, and its anti-loosening performance is an important technical index. At present, there is a lack of in-depth research on the relationship between closure quantity and anti-loosening performance. A simulation analysis method for the locking performance of self-locking nuts including closing process, assembly process and loosening process was established. The effect of closing amount on the locking torque and locking performance of self-locking nuts of aerospace MJ10 specification was studied. The results show that the self-locking torque increases with the increase of the closing amount when the closing amount is between 0 and 300 μm, that is, the self-locking torque of the self-locking nut increases with the closing amount. When the closing amount is less than 250 μm, the preload attenuation rate decreases with the closing amount increasing. When the closing amount exceeds 250 μm, the larger the closing amount, the greater the preload decay rate, that is, within a certain range, the larger the closing amount, the better the anti-loosening performance of the self-locking nut, but when the closing amount exceeds a certain value, the anti-loosening performance of the self-locking nut decreases, not the larger the closing amount and self-locking torque, the better the anti-loosening performance of the self-locking nut. The research in this paper can provide reference for fastener manufacturing enterprises to optimize the closing amount of self-locking nuts. |
| Key words: Self-locking nut Amount of closure Self-locking torque Anti-locking performance |