Assembly Process Analysis of Automobile Fastener Connection-Torque Tightening Method Of Fasteners

Fasteners are very important parts and are widely used, especially in the automotive field. It can be said that fasteners are essential in an automobile. As a professional fastener manufacturer, Xinchi Fastener Company is pleased to introduce to you the assembly process of automotive fastener connection, including the fastener torque tightening method and fastener connection classification.

In automobile assembly, thread connection accounts for 31% of automobile assembly operations. The assembly quality of threaded fasteners will directly affect the assembly quality and driving reliability of the whole vehicle. Therefore, the threaded fasteners need to be tightened to tighten the connected parts before external loads are applied. Tightening threaded fasteners is tightening, and the force is called axial tightening. To ensure the reliable service of bolts, proper axial clamping force must be guaranteed during assembly. In the process of parts assembly, even if the same bolt and nut are used and the same assembly process is adopted, the preload will still be different. At present, torque tightening is still the most common and economical tightening method for screw parts tightening assembly. The most economical and feasible method in the assembly process is to control the axial clamping force indirectly by controlling the torque.

Torque is a force that produces rotational motion. It acts on a threaded fastener to produce rotation. Rotation can cause the joint part to be subjected to a clamping force through the thread, and this initial clamping force is the required preload.

Since fastener assembly mainly occurs in the elastic strain stage of materials, fasteners and connected parts can be considered elastomers in the stress model of the fastener assembly. All “elastomers” are free before the fastener is tightened. After the fastener is tightened, the stretching of the bolt elongates the spring, and the connected parts are compressed due to the action of pressure so that the whole connecting system through torque tightening achieves the required minimum pre-tightening force.

Xinchi Fastener Company is a trustworthy fastener company, especially in furniture nuts. And we are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier,  Xinchi Fastener Company can offer a wide range of high-quality fasteners, including tee nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.