Method for manufacturing wire harness
View Patent ↗A water blocking structure of a wire harness and a method for manufacturing the wire harness is provided. The water blocking structure includes a set of wires including a plurality of wires arranged in at least one row and side by side in a direction of a diameter of the wire, and an integrally molded stopper made of a hard resin that is injection-molded at a low-pressure so as to surround a portion of the set of wires in an extending direction of the wires and to have an outer circumferential shape defining portion that conforms to an inner circumferential shape of a wire passage portion into which the set of wires is to be inserted.
1. A method for manufacturing a wire harness, the wire harness having a set of wires including a plurality of wires arranged in at least one row and side by side in a direction along a diameter of the wires, and a stopper that is made of a hard resin, the stopper surrounding a portion of the set of wires in an extending direction of the wires and having an outer circumferential shape defining portion that conforms to an inner circumferential shape of a wire passage portion into which the set of wires is to be inserted, the method comprising:
closing an upper die and a lower die in a state in which a portion of the set of wires is placed in a harness receiving portion formed at a parting surface of the upper die and the lower die, the upper die and the lower die having a cavity for molding of the stopper, the harness receiving portion having a burr-cutting portion for holding an outer circumference of the set of wires between the upper die and the lower die such that a gap is provided between the burr-cutting portion and the set of wires, the burr-cutting portion being provided at an end portion of the cavity on each of both sides in the extending direction of the set of wires;
injecting the hard resin in a molten state into the cavity at a low pressure;
sealing the gap between the burr-cutting portion and the set of wires with the hard resin in a molten state; and
forming a caulking portion between the set of wires and protruding in the extending direction of the set of wires from a side surface of the stopper from which the set of wires extends out from the stopper.
2. The method according to claim 1 , wherein the harness receiving portion comprises a concave portion on the lower die configured to receive the set of wires, and the harness receiving portion comprises a flat surface portion on the upper die to be opposed to the concave portion, and
wherein the closing of the upper die and the lower die includes pressing the set of wires received in the concave portion by the flat surface portions in a direction in which the set of wires is held.
3. The method according to claim 1 , further comprising setting a temperature of the upper die and lower die lower than a melting temperature of the hard resin in vicinities of the burr-cutting portion.