Brief introduction of two types of self-piercing riveting technology

1 Semi-tubular rivet self-piercing riveting technology

The self-piercing riveting technology of semi-tubular rivets, the blank holder first moves downwards to pre-compact the riveting material, preventing the riveting material from flowing into the die under the force of the rivet, and then the punch moves downward to push the rivet Pierce the upper material. Under the combined action of the die and the punch, the tail of the rivet is opened in the lower metal to form a bell mouth shape in order to lock the riveting material and achieve the purpose of connection. In the semi-hollow riveting process, when riveting the same metal material, put the thicker one on the lower layer; when riveting two layers of different metal materials, put the material with good plasticity on the lower layer; when riveting metal and non-metal materials, put the metal material on the lower layer. In automobile body manufacturing, considering the specific production environment, the characteristics of the self-piercing riveting process, the connection strength and the mechanical properties of the applied materials, and the riveting technique of solid rivets has many limitations of its own, so in the automobile The self-piercing riveting process of semi-hollow rivets is mainly used in lightweight production.

2 Solid Rivet White Punch Riveting Technology (Guide: Briefly describe how to remove worn hexagon socket bolts)

The self-piercing riveting process of waist-drum solid rivets, the punch pushes the solid rivets down together, the cutting edge at the bottom of the rivet flushes the riveting material and falls from the die, and the rivet stops moving when it reaches the die; As the head continues to descend, the boss on the lower end of the punch pressurizes the riveted material, forcing it to undergo plastic deformation and flow inward radially, so that it tightly wraps the waist drum rivet, thereby forming a stable locking state. This riveting process can only be used for the connection between plastic metal and metal.

Another solid rivet self-piercing riveting technology, the rivet shape is not a drum shape, but there is an annular groove on the rivet. When the punch descends to the bottom dead center, the riveted material is squeezed, and the riveted material of the lower layer is squeezed to produce radial flow to fill the concave blank holder ring groove of the groove, and the upper end surface of the rivet produces an upsetting head, and the two The layer materials are riveted together.

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