Riveting device and riveting method

A riveting method of deforming a rivet inserted into a through-hole formed in a plurality of plate-shaped members disposed in a superimposed state and securing the plurality of plate-shaped members,

• the rivet including
• a shaft portion that extends along an axial line and has a first outer diameter in a radial direction that perpendicularly intersects the axial line, and
• a head that is coupled to the shaft portion and has a second outer diameter that is larger than the first outer diameter in the radial direction, the head comprising an incline surface, a coupling surface, and a flat surface, the coupling surface connecting the incline surface to the flat surface,
• the riveting method comprising:
• a first disposing process of disposing a support surface of a first riveting member in a state in which the support surface faces a first end surface of the head;
• a second disposing process of disposing a pressurizing surface of a second riveting member in a state in which the pressurizing surface faces a second end surface of the shaft portion;
• and
• a riveting process of generating a pressurizing force causing a distance between the first riveting member and the second riveting member along the axial line to decrease and plastically deforming the rivet,
• wherein a counterbore portion for accommodating the head of the rivet is formed at an end portion of the through-hole,
• wherein the pressurizing surface of the second riveting member is formed into a flat shape that perpendicularly intersects the axial line, and a surface roughening treatment is performed on the pressurizing surface,
• wherein the riveting process causes the pressurizing surface on which the surface roughening treatment is performed to come into contact with the second end surface of the shaft portion of the rivet and plastically deform the rivet with the pressurizing force, and
• wherein the pressurizing surface on which the surface roughening treatment is performed curbs movement of the second end surface of the shaft portion that comes into contact with the pressurizing surface relative to the pressurizing surface in comparison with the pressurizing surface on which the surface roughening treatment is not performed so that a clearance formed between the head of the rivet and the counterbore portion is reduced more when the rivet is plastically deformed by the pressurizing surface on which the roughening treatment is performed than by the pressurizing surface on which the surface roughening treatment is not performed.