Topy Kogyo Kabushiki Kaisha

Kenji Taguchi

Kishiro Abe

Katsuki Kato

Takamitsu Takano

Satoru Miyashita

Yuji Iwakura

Koji Takeuchi

Tsuneo Watanabe

Akira Nakamura

Takayuki Nonaka

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

A method of manufacturing a wheel rim for a vehicle includes an ironing step for ironing a tubular material to manufacture a tubular member having a non-constant thickness, using an ironing apparatus provided with a punch, a die whose side surface opposing the punch is a convex and concave surface, and a pressing member. At the ironing step, a flange portion of the tubular material is set at the die, then the pressing member is moved relative to the die thereby to squeeze the flange portion of the tubular material by the pressing member and the die, and then the punch is moved relative to the die to iron at least a portion of the tubular material except the flange portion of the tubular material to manufacture the tubular member having a non-constant thickness.

Method of manufacturing a wheel rim for a vehicle

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Chigasaki, Japan

Kenji Taguchi