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Method and apparatus of manufacturing a synthetic resin tubular member having differently oriented inlet tube and outlet tube portions uses a pair of displaceable molding dies. One of the dies is rotatable relative to the other die. The molding dies have a core portion fitted to the tube end of one

Method and apparatus of manufacturing a synthetic resin tubular member having differently oriented inlet tube and outlet tube portions uses a pair of displaceable molding dies. One of the dies is rotatable relative to the other die. The molding dies have a core portion fitted to the tube end of one of the inlet and outlet tube portions and is slideable in a direction different from the direction in which the dies open and close. The method includes the steps of core insertion, die clamping, injection, die opening, core removal, ejection, and die rotation. Each time the molding die is rotated one step, a primary molding step, in which two molding halves of the tubular member are formed, and a secondary molding operation, in which the two molding halves are joined, are formed, so that a finished tubular member is obtained for each rotational movement of the molding dies. A melted resin is filled into an interior passage defined along a peripheral edge of one of the dies after the molding dies are brought into abutment with each other to join the two halves. The finished product can be a synthetic resin manifold. The manifold has a plurality of outlet tube portions branching from an inlet tube portion. One of the two halves has both the inlet and out tube portions. That is, the inlet and outlet portions are monolithic to provide seamless inlet and outlet.

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[ What is claimed is:] [1.] A method of manufacturing a synthetic resin tubular member having differently oriented inlet tube portion and outlet tube portion wherein separate halves of the tubular member are molded in a pair of molding dies, the molded separate halves in the molding dies being broug

[ What is claimed is:] [1.] A method of manufacturing a synthetic resin tubular member having differently oriented inlet tube portion and outlet tube portion wherein separate halves of the tubular member are molded in a pair of molding dies, the molded separate halves in the molding dies being brought into abutment with each other, a melted resin mass being filled into an interior passage defined along a peripheral edge of the abutted portions to thereby join the separate halves, the method comprising:using a pair of molding dies for die rotary injection molding adapted to be opened and closed relative to each other and rotatable in relation to each other over a predetermined angular range, the molding dies having a molding section consisting of at least one male molding portion and two female molding portions in a repetitive sequence of male/female/female in the direction of rotation for each rotational run over the predetermined angular range, the molding dies further having a slide core adapted to be fitted to a tube end portion of one of the inlet and outlet tube portions and slidable in a direction different from the direction in which die opening and closing is made; and carrying out:the step of core insertion for inserting the slide core into a molding portion of the molding die pair corresponding to the tube end portion of one of the inlet and outlet tube portions;the step of die clamping for closing and clamping the molding die pair;the step of injection for injecting a melted resin mass into a molding cavity defined by closing the molding die pair;the step of die opening for opening the molding die pair;the step of core removal for removing the slide core from the tube end portion;the step of ejection for ejecting a molded tubular member from the molding die pair; andthe step of die rotation for rotating the dies over a predetermined angle,wherein each time when one rotational movement of the molding die pair is made, a primary molding operation for molding separate halves through a combination of the male molding portion and one female molding portion, and a secondary molding operation for joining a pair of separate halves through a combination of the female molding portions are performed so that a finished tubular member will be obtained for each rotational movement of the molding dies.