多种收口因素对GH738自锁螺母力矩衰减速度的影响研究

Various Influence on Locking Torque Descent Rate of GH738 Self-Locking Nut

为研究多种收口因素对GH738自锁螺母锁紧力矩衰减速度的影响规律,制定针对性的改进措施,采用分组试验的方法对比分析了螺母收口方式、锁紧段壁厚、收口量大小3种因素组合作用时螺母锁紧力矩衰减速度的情况。结果表明:采用三点收口方式、增大收口段壁厚、增大收口量总体上均可以提高螺母的拧出力矩值。对于MJ8螺母,采用上述收口工艺后螺母拧出力矩衰减程度由43.2%下降到17.9%,但对于规格MJ6及以下的螺母,采用三点收口工艺时螺母锁紧性能衰减速度对锁紧段壁厚变化敏感,表现不稳定。

In order to study the influence of various factors on locking torque descent rate of GH738 self-locking nut,targeted improvement measurements and group tests were taken under the combined effect of three factors,namely,deformation form,thickness and deformation amount of lock area.The results show that the locking torque can be increased by adopting three-point deformation process,increasing the thickness and deformation amount of the lock area.For MJ8 nuts,after improvement the descent scale of locking torque decreases from 43.2%to 17.9%,but for MJ6 and below nuts,the descent rate of locking torque is susceptible to the variation of lock area thickness when adopting threepoint deformation process,which is unstable.