Patent ID: 6752197
Filing Date: 2004-06-22
Classification: B22D

Abstract:
An injector for a vacuum die-casting apparatus, comprising: an injector body which encloses a containment chamber for containing injection material and is provided with at least one first opening for loading molten material in said chamber and at least one second opening for injecting in and, respectively, aspirating protective gas from said chamber, said first and second openings being arranged on said injector body in order of operation; an injection piston movable with a sliding motion in said chamber for pushing the molten material into a die of the die-casting apparatus, said piston comprising an external surface and a head end thereof; a supporting element, which is arranged separate from, and coaxial to said chamber and acts as a guide and support for the piston during motion thereof among a retracted position, in which the head end is arranged at the supporting element, and advanced positions, in which the piston advances in the chamber to allow loading of molten material in said chamber and for injecting the loaded molten material, respectively, and back to the retracted position; cleaning and lubricating means arranged in order of operation on said supporting element so as to provide cleaning and lubricating of the whole external surface of the piston upon movement thereof among said retracted and, respectively, said advanced positions.