Method of manufacturing an annular member made from a metal sheet having a peripheral wall
AssigneeKabushiki Kaisha Kanemitsu
InventorsToshiaki Kanemitsu, Kunihiro Harada, Naoki Fujii
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Abstract
The present invention relates to a disc-shaped material made from metal sheet, provided for the manufacture of a pulley or the like. According to the present invention, even if the metal sheet is thin and light weight, a peripheral wall of sufficient strength can be formed, by the following steps: rotating the material held between a pair of dies and pressing an outer periphery of the material by means of a forming roller, in a radially inward direction, thereby thickening axially the outer periphery of the material to be extended to both sides of a non-processed portion, thus forming the peripheral wall.
Claims8
A method of manufacturing an annular member from a disc-shaped metal sheet material defining an outer periphery, comprising the steps of:
- forming the disc-shaped metal sheet to have a non-processed portion including the outer periphery and a stepped portion defined by an inclined wall, and an inner swelling portion connected to the outer periphery by the stepped portion, the outer periphery and the swelling portion lying in different planes;
- rotating the disc-shaped metal material;
- pressing the outer periphery of the metal sheet material in a radially inward direction, while continuing to rotate the metal sheet material;
- thickening the outer periphery axially and without buckling by said pressing;
- protruding the outer periphery to either side of the non-processed portion of the metal sheet material;
- and
- forming a peripheral wall protruding to either side of the non-processed portion.
Dependencies are inferred from the claim text.