METHOD OF MANUFACTURING COIL SPRING AND COIL SPRING MANUFACTURING APPARATUS
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United States of America Patent
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Jun 25, 2015
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Jun 25, 2015
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Abstract
A method of manufacturing a coil spring and a coil spring manufacturing apparatus are provided that enable precise forming of a coil spring even when various kinds of wire rods are used as a wire rod. This is based on the premise that the wire material being fed out is serially pressed against a rotating roller outer circumferential surface to form the wire rod into a coil shape. Under this premise, as the wire rod is fed out, a rotating roller is rotationally driven by a rotary drive force of a servomotor such that a portion pressed against the wire rod on the rotating roller outer circumferential surface moves toward the advancing side of the wire rod.
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