Patent ID: 9126261
Filing Date: 2015-09-08
Classification: B22D

Abstract:
1. Injection pump for the hot-chamber die casting of corrosive light alloys comprising a body provided with an internal coaxial liner where an injector piston sealingly slides driven into a reciprocating motion by a relevant actuator ( 26 ), said liner being made of a material that resists the corrosion of said light alloys and has a coefficient of linear thermal expansion at temperatures between 300° K and 950° K which is different by at least 1.5×10 −6 /° K from the coefficient of linear thermal expansion of the material of said body static sealing elements, made of a graphite-based non-metallic material that yields under compression, arranged between the internal surface of the body and the external surface of the liner; first axial compression means for the axial compression of the liner; and second axial compression means, for the axial compression of the static sealing element, arranged between a locking member integral with the body and said static sealing elements.