Lightened disk for a wheel and a method for manufacturing the same
AssigneeTopy Kogyo Kabushiki Kaisha
InventorsKishiro Abe, Ryoichi Watanabe, Ryo Nishibayashi, Yuji Iwakura
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Abstract
A lightened disk for a wheel has a flange having an axially inboard edge. The inboard edge includes a general portion which is located in a plane perpendicular to an axis of the disk. The flange portion has a thickness less than 90% of a thickness of a disk material at at least the general portion of the inboard edge. A method for manufacturing a lightened disk for a wheel includes a drawing step during which the flange portion is drawn such than the flange portion has a thickness less than 90% of a thickness of a disk material at at least the general portion of the inboard edge.
Claims5
A method of manufacturing a lightened disk for a wheel comprising:
- stamping a flat disk material from a flat plate;
- manufacturing a disk by plastically deforming said disk material at least one time so that said disk includes a straightly cylindrical flange portion having an axially inboard edge, said axially inboard edge including at least one general portion extending circumferentially in a plane essentially perpendicular to a rotational axis of said disk along at least a portion of said axially inboard edge;
- and
- using an inner die and an outer ring die having a radially inwardly protruding protrusion, drawing said straightly cylindrical flange portion into a thinner straightly cylindrical portion while said disk material is being plastically deformed during at least one of the times said disk material is being plastically deformed or after at least one of the times said disk material is being plastically deformed so that said straightly cylindrical flange portion is reduced to a thickness equal to or less than about 90% of an original thickness of said disk material at said general portion of said axially inboard edge.
Dependencies are inferred from the claim text.