MANUFACTURE OF INTAKE MANIFOLD

摘要

PURPOSE:To manufacture easily an intake manifold provided with a flange part having necessary physical properties by including rigidity and heat resistance, by a method wherein the flange part is molded by casting a smaller quantity of a molding material than capacity of a cavity into a flange part forming cavity into which gas is blown. CONSTITUTION:A product main body 2 is adjusted by blow molding. Set protrusions 2c, 2d, 2e projecting outward of a final product form are formed on a front and rear both ends of an inside part 2a of a surge tank and tips of inside parts 2b each in the product main body 2. A flange part molding tool is comprised of a stationary molds 12 and movable mold 13, the product main body 2 is set up to the molding tool which is in a mold broken state and the mold is clamped. In this instance, the set protrusions 2c, 2d, 2e of the product main body 2 are fitted into set recessed parts 15... formed into the molding tool 11 and the flange parts each forming cavities 17... are formed. Then a smaller quantity of the molding material than capacity of the cavity is cast into flange part forming cavities 17 each and directly after that the flange parts 5, 6, 8 each are molded by blowing gas into the cavities through the same casting port separately or while casting the molding material.