MANUFACTURE OF GROOVED METAL BAR

摘要

PURPOSE:To obtain at low cost a grooved metal bar of high accuracy without any strain by forming the range performing a grooving in a thin part and rolling the thin part by using a roll having a projecting bar thereafter. CONSTITUTION:A thinner part 1B is formed by rolling or cutting the range performing a grooving in the longitudinal direction of a metal bar 1 and an annealing and buffing are executed on the metal bar 1 provided with the thinner part 1B thereafter. In succession a rolling is performed once or several times by arranging between the roll 2 with projecting bar having plural projection bars in a rolling stage and a flat roll 3 the thinner part 1B of said metal bar 1 so as to conform to the projection bar part 2A of the roll 2 with projecting bar. At this rolling time the groove lower part 1C performing a grooving by the projection bar of the roll 2 with projecting bar is extruded by the projecting bar, coming into the recessed part between the projecting bar of the roll 2 with projecting bar 2 and the projecting bar. A straightening by a leveler is thereafter performed as the final stage.