Method of manufacturing a hub for a spindle motor
AssigneeNippon Densan Corporation
InventorsShigeru Tasaki, Hisayoshi Ohashi, Shinobu Hirono
Life of this patent
Estimating the term…
Abstract
A spindle motor for rotating a recording medium. A hub having an end wall portion, a cylindrical portion extending from the end wall portion, and a flange extending from the cylindrical portion radially outwardly is formed by forging, drawing or ironing. The recording medium is placed on the flange portion.
Claims5
A method of manufacturing a hub of a spindle motor for rotating a recording medium, comprising the steps of drawing or ironing a blank to form an intermediate work piece to be formed as a hub, the intermediate work piece having an end wall portion, a cylindrical portion extending from the outer circumferential end of the end wall portion substantially perpendicularly, and a flange portion extending from a free end of the cylindrical portion radially outwardly, and pressing a base portion of the flange portion to form an annular recess in the base portion after the step of forming the intermediate work, wherein the recording medium is placed on the surface of the flange in which the annular recess is formed.
A method of manufacturing a hub of a spindle motor for rotating a recording medium, comprising the step of forging a blank into an intermediate work from which the hub is formed, said intermediate work having an end wall portion, a cylindrical portion extending from the outer circumferential end of the end wall portion substantially perpendicularly, and a flange portion extending from a free end of the cylindrical portion radially outwardly, and comprising an auxiliary forging step in which after the forging step, recesses for forming threaded holes for fixing a clamp member are formed in the end wall portion, and in which an annular recess is formed in a base portion of the flange portion.
Dependencies are inferred from the claim text.