4. Pre-tightening and anti-loosening of thread connection
1. Pre-tightening of thread connectionThread connection: loose connection — do not tighten when assembling, only when the external load is applied to the force — tighten when assembling, that is, when carrying, it has been pre-stressed, pre-tightening force F’Pretightening purpose — to enhance the rigidity and tightness of the connection and improve the anti-loosening ability. For the bolt connection subject to axial tension, it can also improve the fatigue strength of the bolt; For the ordinary bolt connection subject to lateral load, it is conducive to increasing the friction between the joint surfaces in the connection
2. Anti-loose thread connection
1) The purpose of locking
In actual work, the load has vibration, change, high temperature creep of the material will cause the friction to decrease, the positive pressure in the thread pair disappears at a certain moment, the friction is zero, so that the thread connection is loose, such as repeated action, the thread connection will relax and fail. Therefore, it is necessary to prevent loosening, otherwise it will affect the normal work and cause accidents.
2) Lockout principleEliminate (or limit) the relative movement between thread pairs, or increase the difficulty of relative movement.
Post time: Sep-08-2023