| 摘要 |
The invention is directed to a method for caulking a caulking member such as a caulking nut or a caulking bolt to a metal plate 2. The metal plate 2 is arranged on a die 51 having a caulking protrusion 51b formed on an end surface thereof, the caulking member is arranged on the metal plate while a position of a caulking recess portion 1b of the caulking member is aligned with the caulking protrusion 51b, and a punch 52 is brought closer to the die 51 so that the caulking member is pressed against the metal plate 2. While an upper surface of the metal plate 2 in a position opposite to the caulking recess portion 1b is restricted by a downward protruding portion 52b of the punch or by the caulking member, the metal plate is plastically fluidized into the caulking recess portion 1b, so that the caulking member is caulked without boring a hole in the metal plate. |
