摘要:
A rotation shaft includes a spiral groove for feeding which is formed on the outer peripheral face of the rotation shaft and a plurality of fine recessed parts which is formed on a flank surface of the spiral groove. The rotation shaft may be manufactured by a spiral groove forming step which forms a spiral groove on an outer peripheral face of the rotation shaft and a roughening step which forms a plurality of fine recessed parts on the flank surface of the spiral groove by using a first abrasive medium whose size is set to be capable of reaching to the flank surface. The rotation shaft may be preferably applied to a feeding device and a motor.
摘要:
A feeding device includes a rotation shaft in which a male screw is formed on its outer peripheral face and a movable body which is provided with a plurality of projections that engage with the male screw. The male screw is constructed in a multiple thread screw comprising of a plurality of screws, and numbers of the projection(s) engaging with each of the plurality of screws are equal to each other. The multiple thread screw is preferably produced by using round form-rolling with a fixed side round form-rolling die and a movable side round form-rolling die.