| 摘要 |
A swollen portion is formed on a metal plate so that a through hole is formed in the forward end surface of this swollen portion, and thereafter a forward end portion of the swollen portion is relatively reduced in outer diameter as compared with a base portion, so that the forward end portion is relatively reduced in thickness. Then, the outer and inner diameters of the base portion are reduced while substantially maintaining its thickness. Thus, the forward end portion defines a relatively thin portion to be caulked, and the base portion defines a relatively thick female screw forming portion. Thus, it is possible to form a shaft portion having a uniform outer diameter and comprising the portion to be caulked having the relatively thin forward end portion for a tee nut in a state held by the metal plate, with application of plastic working.
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