Principle of Rivetless Connection

Rivetless connection is a plate connection technique that utilizes the cold deformation ability of the plate itself to perform pressure processing on the plate, causing local deformation of the plate and connecting the plate together. It is a plate connection method that does not require additional connectors.
The rivetless connection method does not require spot welding, and riveting can achieve better connection of two or more layers of panels with different thicknesses and materials.
The connection has no requirements for the surface of the board, and workpieces with coatings or paint on the surface can be directly connected without treatment, without damaging the surface of the workpieces or causing deformation of the connection.
This type of connection is widely used in the automotive industry, especially in the automotive body.
Rivetless connection technology utilizes a sheet metal pressing machine and a dedicated connection mold to form a stress free internal inlaid circle with certain tensile and shear strength based on the cold extrusion deformation of the plate material through an instantaneous high pressure processing process, which can connect two or more layers of plates with different materials and thicknesses.
The rivetless connection technology has no requirements for the surface of the board, and the original coating and paint layer on the surface of the board at the connection point are not damaged.
The connection process has a high degree of automation, allowing for single or multiple simultaneous connections, as well as non-destructive connection strength testing and automatic monitoring of the entire process, resulting in extremely high production efficiency.
In the process of rivetless connection, the punch first contacts the upper material, and the material begins to stretch and deform into the concave mold under the pressure of the upper mold. At the same time, the movable part of the concave mold opens outward to fully deform the metal material in the cavity of the concave mold, forming a tight connection point. Then, the punch returns, and the movable part of the concave mold returns to its original position under the action of spring force.