Patent ID: 8540917

Claim:
An insert molding method, comprising: holding a plurality of insert members in a molding die to be separated from one another; and subsequently filling a resin into the molding die to fill a gap between the plurality of insert members and a periphery thereof with the resin to form an insert molded product such that the plurality of insert members are separated at a preset interval from one another, wherein the molding die comprises a space-maintaining projection for maintaining a separation interval between the plurality of insert members at the preset interval or more, the projection being formed on an inner wall surface of the molding die opposite to a longitudinal end of the plurality of insert members, and a gate for filling the resin therethrough into the molding die, the gate being formed on an inner wall surface of the molding die opposite to a side of the plurality of insert members in a width direction thereof, wherein the plurality of insert members are held in the molding die such that the separation interval is allowed to change and to be more than the preset interval while sandwiching the projection, wherein the resin is filled through the gate into the gap between the plurality of insert members such that the resin subsequently penetrates into an inner rim portion of the molding die, and the end of the plurality of insert members is pressed against the projection by resin pressure of the penetrating resin to form the insert molded product; and wherein the molding die further comprises a push bar to be inserted into the molding die to contact the plurality of insert members, and the push bar is pushed in so as to supplement the resin pressure for reducing the gap between the plurality of insert members when the resin penetrates into the inner rim portion of the molding die.