v1. Importance of fasteners
If the force is too small, the gasket may not be in place; Too much force will wear the thread. According to the recently released data, 23% of the maintenance problems in the automotive industry are caused by loose fasteners, and 12% of new cars have incorrect fastener tightness. Bolt is one of the most important factors that determine the assembly quality. The failure of threaded fasteners to achieve the corresponding capacity is an important reason for assembly accidents!
2. Fastener bolt tightening principle
The bolted connection must be able to resist the action of external forces, so that the assembled parts will not move in the direction of separation, otherwise it will cause the loosening, damage or falling off of the bolted joint.
Therefore, we must design the minimum clamping force of the bolt to prevent the clamping part from being separated due to external forces, and maintain friction clamping or ensure sealing, etc.
The bolt is inserted into the connected part and tightened with a nut or internal thread to make the bolt stretch and deform. This elastic deformation generates an axial tension, squeezing the clamped parts together, which is called preload.
In theory, as long as sufficient clamping force is generated, the clamped parts can be fully guaranteed to work safely in harsh environments such as vibration, high and low temperatures, without the use of auxiliary methods such as gluing.
Mr. andy