不同因素对高锁螺母锁紧力矩影响的研究

Influence of Some Different Factors on Locking Torque of Hi-Lock Nut

在直升机的实际装配过程中,一种高锁螺母会与多种高锁螺栓进行装配,而高锁螺母的锁紧力矩与稳定性不能保证。首先,从螺纹副精度、润滑条件、收口尺寸、材料、表面处理等方面对高锁螺母的锁紧力矩变化规律进行了定性分析。然后,通过试验的方法研究了不同材料、润滑条件及表面处理情况下,高锁螺母锁紧力矩的变化。试验结果表明:同规格下,硬度越大的材料,锁紧力矩愈大,稳定性愈差;在同样条件下,有润滑的高锁螺母配合,其锁紧力矩愈小,稳定性有明显加强;不同表面处理对高锁螺母的锁紧力矩的大小有一定影响,但稳定性变化很小。

In the actual assembly process of a helicopter, one kind of hi-lock nut will match with a variety of hi-lock bolts, which cause locking torque of hi-lock nut not to be guaranteed. Firstly, parameters that may affect the locking torque of hi-lock nut are qualitatively analyzed which takes into consideration screw precision, lubrication conditions, reducing values, materials, surface treatment. Then the test is done which in terms of variation of locking torque under different materials, different lubrication conditions and different surface treatments. The result of test shows the harder the material is, the greater the tightening torque is and the worse the stability is. Under the same condition, the locking torque becomes smaller and the stability is significantly enhanced when the nuts are with lubrication. And different surface treatments have effect on locking torque and change the stability a little.