Method for manufacturing cylindrical ring member, bearing, clutch, vehicle, and machine
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United States of America Patent
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Feb 26, 2019
Grant Date -
Sep 13, 2018
app pub date -
Jul 18, 2017
filing date -
Jul 19, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A method of manufacturing a cylindrical ring member includes a step of forming a metal intermediate material having a cylindrical portion and a chamfering step by cold forging in which a normal chamfer portion is formed on an axial end peripheral edge of the cylindrical portion by pressing a radial end portion of an axial end surface of the cylindrical portion against an annular chamfering surface provided in a mold configuring a mold device. A chamfering step is performed by cold forging in a state where a preliminary chamfer portion, of which a width dimension in a radial direction is larger than a width dimension of the normal chamfer portion in a radial direction, is formed on the axial end peripheral edge of the cylindrical portion.
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