Coil spring for automobile suspension and method of manufacturing the same
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United States of America Patent
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Jan 20, 2015
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Sep 28, 2010
filing date -
Sep 29, 2009
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Abstract
A manufacturing method of a coil spring for an automobile suspension includes forming a material into a coil shape; performing a heat treatment step on the material; performing a warm shot peening step on the material, and performing a hot setting step on the material. By performing the warm shot peening step prior to the hot setting step, a stronger compressive residual stress is imparted in a direction along which a large tensile stress acts during actual use of the coil spring, thereby improving sag resistance and durability of the coil spring. A coil spring is also manufactured according to this method.
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