Ram support skate for an injection molding machine

Details Ram support skate for an injection molding machine Ram support skate for an injection molding machine

B - Operations, Transporting

29

C

B29C 45/67 (2006.01) B29C 45/17 (2006.01)

Patent

CA 2291239

A self-compensating support skate (46) for an annular hydraulic ram (15) mounted in the front stationary platen (10) of a "two-platen" injection molding machine (1) is disclosed. The hydraulic ram (15) fits into a central bore (22) in the stationary platen (10) and connects directly to a relatively thin die platen (11) that provides a mold mounting surface. The purpose of the skate (46) is to prevent movement (tilting) of the die platen (11) and the resulting misalignment with the movable platen (20) when the mold (30) is attached. The skate (46) is adjusted during assembly to compensate for the tolerance stack-up in the ram assembly. The "zero" clearance is maintained by disc springs (56) within the skate (46) that compensate for the expansions and contractions of the large diameter parts due to temperature variations. The die platen (11) is held in the aligned position by contact with the lower tie rods (7).

L'invention concerne un ensemble support auto-compensateur (46) destiné à un bélier hydraulique annulaire (15) monté sur le plateau fixe avant (10) d'une machine à mouler (1) par injection à deux plateaux. Le bélier hydraulique (15) est conçu pour venir se loger dans un alésage central (22) du plateau fixe (10) et est directement relié à un plateau matrice (11) relativement mince constituant une surface de montage du moule. Le rôle de l'ensemble (46) consiste à empêcher le mouvement (basculement) du plateau matrice (11) et le défaut d'alignement qui en résulte par rapport au plateau mobile (20) lorsque le moule (30) est fixé. L'ensemble (46) est réglé lors de l'assemblage pour compenser l'accumulation des tolérances dans l'ensemble bélier. Des ressorts à disques (56) disposés dans l'ensemble (46) permettent de maintenir un jeu nul, lesquels ressorts compensent les dilatations et les contractions des pièces de grand diamètre dues aux variations de température. Le plateau matrice (11) est maintenu aligné par contact avec les tiges (7) d'éjection inférieures.

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