Rivet usage and self-piercing rivet advantages

The riveting of rivets is the use of a metal cylinder or metal tube (rivet) slightly smaller than the perforated diameter, through the workpiece that needs to be riveted, and the two ends of the rivet are knocked or pressurized, so that the metal column (tube) deformation and thickening at the same time at both ends to form a rivet head (cap), so that the workpiece can not come out of the rivet, in the action of the external force of the workpiece separation, the nail rod, nail cap to bear the resulting shear force, to prevent the workpiece from separating.
  
Usage of rivets:
  
1. Riveting is divided into cold riveting and hot riveting, cold riveting is riveting rivets at room temperature; Hot riveting is used in places with high connection requirements, such as the steel beam riveting of iron bridges, hot riveting needs to preheat the rivets, red hot rivets through the rivet hole, after the rivet head is beaten, the stress of shrinking during the cooling process will make the connection tight.
  
2. Riveting generally requires double-sided operation, and the emergence of core rivets makes single-sided operation a simple and easy process.
  
Self-piercing riveting is a common way to join two or more metal plates cold joining technology. Generally speaking, after the self-piercing rivet penetrates the top plate, the hollow structure of the rivet tail expands and pierces without piercing the bottom plate under the action of the rivet die, thus forming a solid rivet point.
  
Advantages of self-piercing rivets:
  
1. Self-piercing riveting technology can connect plates of different materials and multi-layer plate groups, such as steel plates, aluminum plates, plastic plates, etc., which can be combined with adhesive processes;
  
2. The connection point is firm, the riveting quality is stable, the repeatability is high, and the dynamic fatigue of the riveting point is far better than the traditional thin plate connection process such as spot welding;
  
3. Good sealing effect and anti-penetration function;
  
4. Small use site, simple and simple riveting operation, short process cycle, saving labor costs, small energy consumption and less maintenance costs;
  
5. Even on the narrow flange side or in a small installation space, it can be connected;
  
6. By detecting the geometry of the riveting point, the riveting quality can be easily judged, and no damage detection can be realized, and the connection strength can be easily tested without damage;
  
7. There is no thermal stress concentration in the connection area, which can be used for coating or plating plate connection without damaging its surface coating, without post-order painting and electroplating;
  
8. No need to pre-punch, friendly working environment, no dust, toxic smoke emission or waste during riveting, low noise and other advantages;
  
9. The continuity of automatic nail supply system production is easy to realize mechanization;
  
10. The bearing capacity of the dot connection has nothing to do with the load direction, that is, whether it is subject to shear load or top pull load, its bearing capacity is the same;