Method of manufacturing a suspension coil spring
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United States of America
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Mar 10, 2020
Grant Date -
May 2, 2019
app pub date -
Dec 23, 2018
filing date -
Dec 23, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
A method of manufacturing a suspension coil spring includes forming first shot peening indentations on a surface of a wire by projecting first shots toward the wire and forming a compressive residual stress portion to which a compressive residual stress is imparted from the surface of the wire to a first depth, and projecting ball shots as second shots toward a lower end turn portion by an ultrasonic apparatus. A size of each ball shot is larger than a size of each first shot. The method includes forming second shot peening indentations on a surface of the lower end turn portion, and a deep residual stress portion in the lower end turn portion, a compressive residual stress of the deep residual stress portion imparted from the surface of the wire to a second depth that is deeper than the first depth.
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