Patent ID: 8544703

Claim:
An injection chamber for a metal injection machine provided with mold portions which define a molding cavity, said injection chamber (CI) comprising: a tubular body, having a cylindrical inner surface and being formed by a supply portion provided with a closed mounting end and with a radial supply window for pouring a charge of molten metal (MF) in the interior of the injection chamber (CI), and by an injection portion coaxially incorporated to the supply portion and provided with an outlet end, opened to the interior of the molding cavity; and a piston to be axially displaced in the interior of the tubular body, between a retracted position adjacent to the mounting end, and an injection position adjacent to the outlet end, the injection chamber (CI) being characterized in that the supply portion of the tubular body has at least a region of its cylindrical inner surface, which receives the impact of the charge of molten metal (MF) downwardly poured through the radial supply window lined by an insert, formed in a high melting point material and presenting a cross section with its inner contour in the form of a circle arc coinciding with that of the supply portion and the injection portion and with its outer contour contained inside the outer contour of the supply portion.