SPR (Self-Piercing Riveting) is an industrial equipment system that realizes efficient connection based on a new cold connection technology (physical connection). Use special equipment to penetrate the rivet into the bottom plate, and its tail expands to the surroundings under the action of the rivet die, interlocking with the bottom plate to form a "riveting button". According to the different characteristics of the plate to be riveted, specific rivets, rivet dies and riveting parameters are selected to make the riveting quality meet the specified quality standards.