Topy Kogyo Kabushiki Kaisha

Koji Takeuchi

Yoshio Suzui

Kikuya Itou

Kishiro Abe

Satoru Miyashita

Takamitsu Takano

Katsuki Kato

Yuji Iwakura

Tsuneo Watanabe

Kenji Taguchi

Akira Nakamura

Takayuki Nonaka

A method of manufacturing a large- or medium-sized wheel disk including using a punch or die in a first step of ironing a blank of a flat plate to a first-stage product. The first-stage product having a cylindrical rising portion with an axially non-constant thickness. The rising portion includes a thick portion located at a tip portion of the rising portion and a thickness-reduced portion which is a remaining portion of the rising portion excluding the thick portion. During the first step, only a portion of the blank corresponding to the thickness-reduced portion is ironed.

Method of manufacturing a large- or medium-sized wheel disk and a product manufactured thereby

A method of manufacturing a tubular member having a non-constant thickness by ironing at least a portion of the tubular material. The ironing apparatus can have a punch and a die, and the die can have a convex and concave side surface opposing the punch. The method can include bending an axial end portion of the tubular material to form a bent portion. The tubular material can then axially engage the die at the bent portion, and then the punch can be moved relative to the die to iron at least a portion of the tubular material.

Method of manufacturing a tubular member

Growing community of inventors

Ayase, Japan

Koji Takeuchi