Manufacturing method for electric wire having terminal

A manufacturing method for an electric wire having a terminal, comprising:

• a step of connecting a plurality of core wires by an ultrasonic connection process to form a connected core wire;
• a step of arranging the connected core wire on a base bottom part of a terminal between a pair of crimping pieces extended from the base bottom part;
• a step of setting the terminal on which the connected core wire is arranged on an anvil of a crimping apparatus so that the base bottom part is supported on a support surface of the anvil, under a crimper of the crimping apparatus;
• and
• a step of crimping the terminal to the connected core wire by causing the anvil and the crimper to come close to each other and deforming the crimping pieces by an arch groove of the crimper until a space between the support surface and the arch groove defines a predetermined crimped shape,
• wherein, in the step of connecting the plurality of core wires, the core wires are formed into the connected core wire having a cross-sectional rectangular shape having a width and a height in a plane orthogonal to an axis of the connected core wire, the width is not longer than a length obtained by subtracting two times a thickness of the terminal from a width of the arch groove in a state that the space defines the predetermined crimped shape,
• wherein the height of the cross-sectional rectangular shape formed in the step of connecting the plurality of core wires is orthogonal to the width of the cross-sectional shape and is not shorter than a length obtained by subtracting two times the thickness of the terminal from a maximum distance between the support surface and circular arc surfaces of the arch groove in the state that the space defines the predetermined crimped shape,
• wherein the arch groove has two circular arc surfaces which protrude to a direction which separates from the support surface, which extend in a length direction of the connected core wire, and which are aligned in a width direction, and
• wherein, when a distance from an outer end of one of the two circular arc surfaces to an outer end of the other of the two circular arc surfaces in the width direction is a width of the arch groove, an inside distance between the pair of crimping pieces extending in a vertical direction before the step of crimping is larger than a value obtained by subtracting two times the thickness of the terminal from the width of the arch groove.