Patent ID: 9391419
Filing Date: 2016-07-12
CPC Classification: B21D,H01R,Y10T

Claim Text:
1. A method for manufacturing a contact terminal including a contact portion that slides against a surface of a conductive contact plate, the manufacturing method comprising: forming the contact portion in a metal plate by performing a drawing process, wherein the contact portion projects in a thicknesswise direction of the metal plate and has a first diameter; and performing a contraction pressing process at least once on the contact portion so that the diameter of the contact portion gradually decreases, while the height of the contact portion remains the same or decreases in a stepwise manner, wherein the contact portion after performing the contraction pressing process has a second diameter that is smaller than the first diameter, the contraction pressing process includes: the die cavity used in the contraction pressing process includes an open end that defines a guide surface having an arcuate cross-section, the stripper plate has an insertion hole through which the punch is inserted at a position opposed to the die cavity, the insertion hole has a diameter that is greater than or equal to the sum of the diameter of the opposed die cavity and twice a value of the radius of the guide surface, the die cavity in the die plate has a bottom, and when the peripheral portion of the contact portion in the metal plate is held between the peripheral portion of the die cavity in the die plate and a peripheral portion of the insertion hole in the stripper plate, a bulging portion is formed in a basal part of the contact portion, wherein the bulging portion bulges away from the guide surface and toward the insertion hole.