Method of manufacturing a large- or medium-sized wheel disk and a product manufactured thereby
AssigneeTopy Kogyo Kabushiki Kaisha
InventorsKikuya ITOU, Koji TAKEUCHI, Yoshio SUZUI
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Abstract
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.
Claims2
A first-stage product for a large- or medium-sized wheel disk manufactured using the following method:
- a first step of ironing a blank of a flat plate as a material to a first-stage product having a cylindrical rising portion of an axially non-constant thickness using a punch and a die, the first-stage product including 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,
- wherein during the first step, only a portion of the blank corresponding to the thickness-reduced portion of the rising portion is ironed.
2-4. (canceled)
Dependencies are inferred from the claim text.