Process for manufacturing a bearing ring member as a constituent of a rolling bearing unit for wheel support
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United States of America Patent
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Jan 28, 2014
Grant Date -
Jan 21, 2010
app pub date -
Dec 5, 2006
filing date -
Dec 8, 2005
priority date (Note) -
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Abstract
This invention provided a manufacturing method to process a small-diameter step section 18 on an inside end section of a hub body 13a that comprises an outward facing flange 15 and a positioning cylinder 16 stably and with high precision. In this invention, an intermediate material 40 is pressed between a lower punch 36 and an upper punch 46 with an outer peripheral surface of the intermediate material 40 being held by a lower die 37 and an upper die 43, and then a part of the intermediate material 40 is pressed into the lower punch 36 such that the small-diameter step section 18 is formed by cold plastic working.
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