Resin molding mold for intake manifold, intake manifold and method of resin molding for intake manifold

A resin molding mold for an intake manifold comprising a surge tank, an annular flange provided at an end of the surge tank and having a smaller inside diameter than an inside diameter of the surge tank so as to attach a throttle body;

• wherein the resin molding mold comprises a slide mold molding the flange and a plurality of combination-type core molds molding an inner surface of the surge tank;
• wherein the core molds include a first core member capable of a relative movement in advance of another core member after resin molding, and a second core member capable of moving with utilizing an inner space formed by the relative movement of the first core member;
• wherein the first core member and the second core member are configured to be extractable through a space inwardly of a resin-molded flange,
• wherein the first core member is configured to be insertable to and withdrawable from the inner space formed by combining a plurality of the second core members with each other,
• wherein a plurality of intake ports are formed continuously from the surge tank, and
• wherein, at respective portions branching from the surge tank to the intake ports, funnel portions project from a surface of respective second core members into respective intake ports, said funnel portions being integrally formed with the respective second core members.