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据报道,日本对螺纹的防松问题进行了较细致的研究。实验得出,螺纹的螺峰角2a为63°时,能较有效地防止受轴向冲击力而引起的松弛。它的防松原理分析如下: 在螺纹受轴向冲击时,螺栓的载负螺纹面上产生压缩冲击波,这种压缩冲击波向间隙处螺纹面传递时变成拉伸冲击波,而此拉伸冲击波传递到间隙处螺纹面时又变成压缩冲击波。对标准普通螺纹(其螺峰角为60°、55°),其载负螺纹面上产生的压缩冲击波在间隙处
It is reported that Japan conducted a more detailed study on the prevention of thread loosening. Experiments have shown that when the thread lead angle 2a is 63 °, slackening caused by axial impact can be effectively prevented. Its anti-loose principle analysis is as follows: When the thread is subjected to axial impact, the compressive shock wave is generated on the negative threaded surface of the bolt, and the compressive shock wave becomes a tensile shock wave when it is transmitted to the thread surface at the clearance. The tensile shock wave transmission To the gap at the screw surface into compressed shock wave. On the standard ordinary thread (the crest angle of 60 °, 55 °), which carries the compressive shock generated on the threaded surface at the gap