Method and apparatus for manufacturing synthetic resin...

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F02M 35/10 (2006.01) B29C 45/00 (2006.01) B29C 45/10 (2006.01) B29C 45/14 (2006.01) B29C 65/70 (2006.01)

Patent

CA 2230831

The present invention is directed to a method of manufacturing a synthetic resin tubular member having differently oriented inlet and outlet tube portions 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 molding dies for die rotary injection molding which have a core portion to be fitted to the tube end of one of the inlet and outlet tube portions and are slidable in a direction different from the direction in which die opening and closing is made; and carrying out the steps of core insertion, die clamping, injection, die opening, core removal, ejection, and die rotation, whereby each time when one rotational movement of the molding dies is made, a primary molding operation for molding separate halves and a secondary molding operation for joining a pair of separate halves are carried out so that a finished component will be obtained for each rotational movement of the molding dies.

Selon un procédé permettant de fabriquer un corps tubulaire en résine synthétique, dont la partie tubulaire d'entrée et la partie tubulaire de sortie sont orientées différemment, on forme les deux moitiés du corps tubulaire dans une paire de moules, de façon que les moitiés butent l'une contre l'autre dans les moules, puis on remplit de résine fondue un passage interne formé à la périphérie des parties contiguës, de façon à réunir les moitiés. On utilise pour cela un moule pour moulage à injection de type rotatif, comportant une partie noyau associée à l'extrémité tubulaire de la partie tubulaire d'entrée ou de la partie tubulaire de sortie, de façon à pouvoir coulisser dans une direction autre que la direction d'ouverture et de fermeture des moules. On effectue les différents processus d'insertion du noyau, verrouillage du moule, injection, ouverture du moule, enlèvement du noyau, éjection et rotation du moule; on réalise un premier moulage pour mouler les deux moitiés, et un second moulage pour les réunir l'une à l'autre, de façon à obtenir un produit fini à chaque rotation des moules.

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