Injection chamber or container

An injection chamber or container that, applicable to be incorporated in machines for pressure die casting of hot non-ferrous materials and consisting in a cylinder (1) formed from an assembly that comprises an external envelope (2) and an internal insert (3) through which the material is passed under pressure through an opening (4) and pushed by means of a piston (5) from one end of the cylinder (1) to inside a mold (6) located at the opposite end

• characterized in that the external diameter (d) of the internal insert (3) is smaller than the internal diameter (D) of the external envelope (2), between both diameters (d, D) a difference of size (a) existing so that it allows the introduction and extraction of the said insert (3) in the envelope (2) directly and cold, that means, without expanding it, and that the sole expansion the said insert (3) sustains, by the heat of the material to be injected that passes through it when the cylinder (1) is operating, reduces to zero the said difference of size (a) provoking its fixation within the envelope (2).