Method of manufacturing flange structure
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United States of America Patent
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Apr 14, 2015
Grant Date -
Mar 13, 2014
app pub date -
Sep 7, 2012
filing date -
Sep 7, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method of manufacturing a flange structure includes: forming a primary product by extending a columnar material in an axial direction by cold or warm forging such that first shaft portion and a second shaft portion are formed at a first axial end of the material and a second axial end of the material, respectively; forming a secondary product by making a middle portion of the primary product overhang outwardly by cold or warm forging such that a first overhang having a thickness greater than that of the flange is formed; forming a tertiary product by squeezing the first overhang by cold or warm forging such that a second overhang having an outline greater than that of the flange is formed; and defining an outer edge of the flange by cutting off an excessive portion of the second overhang. The second overhang without the excessive portion is the flange.
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