ANODE COPPER BALL FOR PLATING AND METHOD OF MANUFACTURING THE SAME

摘要

A method of manufacturing an anode copper ball for plating by forging in an oilless state, and to minimize flat portions existing on the surface of the ball to improve the rolling property of the ball. Manufacturing an anode copper ball for plating which forms a ball by subjecting a copper rod to cold multi-stage forging by a metal mold composed of a plurality of sets of dies and punches. The method includes a first forging step of forging the copper rod in a direction of its axis without being brought into pressure contact with an inner wall surface of the die, to thereby form a first intermediate material in which outer peripheral portions of end faces of the copper rod are pressed and formed as tapered faces. The first intermediate material is formed in the shape of a ball through the first forging step.