An apparatus and a method for manufacturing pierce nut of the pierce nut

摘要

The present invention provides a method for producing a pierce nut of the manufacturing apparatus and the pierce nut which can be favorably molded pilot portion and the annular wall. A first forging die 30, to blank the machining is performed in the pre-forging die 20 performs processing for preforming the pilot portion and the annular wall (first processing). The second forging die 50, the inclined first forging die 30 is disposed adjacent, against a blank first processing is performed in the first forging die 30, a pilot section on the annular wall side processing (second processing) is performed to be. The third forging die 70, a second forging die 50 is disposed adjacent, inclined relative to the blank second processing is performed in the second forging die 50, an annular wall to the pilot portion process (third process) is performed to be. .BACKGROUND