Manufacturing method of cylindrical member and manufacturing method of vibration damping rubber bushing having the cylindrical member
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United States of America Patent
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Jul 3, 2012
Grant Date -
Dec 30, 2010
app pub date -
Jun 23, 2010
filing date -
Jun 29, 2009
priority date (Note) -
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Abstract
A method of manufacturing a cylindrical member having anti-slip projections formed on axial end faces, the method comprising the steps of: employing a roller die, which is provided with a circumferential die groove of annular form extending through a medial section in a generatrix direction of a die face defined by an integral tapered outside peripheral face, and with a plurality of sloping die grooves extending in a tapered slope direction of the die face situated to both large-diameter and small-diameter sides of the circumferential die groove; providing plastic working to the axial end face with the small-diameter side of the roller die facing towards an inner peripheral side of the cylindrical member and with the large-diameter side facing towards an outer peripheral side, by pushing the die face against the axial end face while rotating circumferentially; and forming simultaneously an annular water barrier projection and the anti-slip projections.
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