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The schematic diagram of the structure before and after the riveting work of the loosening and non loosening screw, with the left image showing the free state and the right image showing the working state. The red one represents the riveted substrate. Expansion riveting process refers to a connection method in which the riveted parts are partially expanded and engaged with the sheet metal using specialized equipment, molds, and certain pressure. The equipment used in the expansion riveting process is the same as that in the pressure riveting process. The upper die head used is tapered, and pressure is used to deform the riveting part of the expansion riveting assembly, forming a certain taper, thereby completing the connection with the riveted part.