Aoyama Seisakusho Co., Ltd.

Yuichi Katsumata

Kazuhiro Koga

Shigeki Matsunami

Tsuyoshi Kojima

Keiichiro Masui

Kenichiro Araki

Dan Kitajima

Provided is a crimp securing structure of a bolt in which a crimp bolthaving a crimping recesson the upper surface of the head is crimped onto a metal sheet. The thickness of a metal material press-fitted into the crimping recessof the crimp bolt is made smaller at the peripheral edge of the crimping recessand is made larger in the center portion thereof. In order to obtain this crimp securing structure, a crimping diein which a stress-relief recessis formed in a center portion of a convex portion is used to prevent the occurrence of excessive local stress in the crimping recess

Crimp securing structure of bolt, crimp securing method for crimp bolt, and crimping die

A piercing nut according to the present invention includes an internal thread, a ring-shaped punching part, a ring-shaped groove, and a bearing surface. The internal threadis formed at the center of a nut main body. The ring-shaped punching partprotrudes around the outer periphery of the internal thread. The ring-shaped grooveis formed around the outer periphery of the ring-shaped punching part. The bearing surfaceprotrudes around the outer periphery of the ring-shaped groove. The height h of the ring-shaped punching partis equal to or lower than the height H of the bearing surfacein the opposite manner to the conventional technique.

Piercing nut and method for fixing the same to inner surface of mating member having closed sectional shape

Growing community of inventors

Niwa-Gun, Japan

Yuichi Katsumata