Metal mold driving device for molding, holding device, and...

B - Operations – Transporting – 29 – C

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B29C 33/24 (2006.01) B29C 43/36 (2006.01) B29C 45/56 (2006.01) B29C 45/67 (2006.01)

Patent

CA 2295121

A metal mold driving device for molding, which is thin and excellent in mechanical efficiency and capable of performing both the compression and expansion (volume expansion) of molten resin in a metal mold; a molding device; and a molding method; wherein the metal mold driving device for molding (20) which moves a movable metal mold (10B) to and from a cavity (10C) comprises a large diameter main cylinder device (21) and a plurality of small diameter sub cylinder devices (22) arranged around the periphery of the main cylinder device (21), whereby, after molten resin is filled, the cylinder devices (21, 22) are operated so as to move the movable metal mold (10B) to and from the cavity (10C) in order to compress or expand the molten resin in the cavity for molding.

L'invention concerne un dispositif d'entraînement de moule métallique pour le moulage, qui est mince et dont l'efficacité mécanique est excellente. Ce dispositif permet d'appliquer à la résine fondue dans un moule une compression et une expansion (expansion de volume). L'invention concerne également un dispositif de moulage et un procédé de moulage. Selon ce procédé, le dispositif d'entraînement de moule métallique pour le moulage (20) approche et éloigne un moule métallique mobile (10B) d'une cavité (10C) comprenant un dispositif cylindrique principal à grand diamètre (21), et plusieurs dispositifs cylindriques secondaires de petit diamètre (22) disposés à la périphérie du dispositif cylindrique principal (21). Ainsi, une fois le moule rempli de résine fondue, on actionne les dispositifs cylindriques (21, 22) de manière à approcher et à éloigner le moule métallique mobile (10B) par rapport à la cavité (10C), ce qui permet de réaliser une compression ou une expansion de la résine fondue dans la cavité, aux fins de moulage.

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