Abstract: An injection chamber or container for machines for pressure die-casting processes is provided, which is formed by a cylinder (1) includes an external cuff (2) and an internal insert (3), through which passes material that is introduced through an opening (4) and pressure-driven by means of a piston (5) into a mould (6). The internal insert (3) has an outer diameter (d) smaller than the inner diameter (D) of the external cuff (2), there being between the two diameters (d, D), a difference of dimension (a) such that the insert (3) can be inserted into and removed from the cuff (2) directly and cold, that is, without dilating it, and such that the only dilation that the insert undergoes (3), which is caused by the heat of the material to be extruded that passes therethrough when the cylinder (1) is operating, causes the insert to become fixed inside the cuff (2).

Abstract: An injection chamber or container for machines for pressure die-casting processes is provided, which is formed by a cylinder (1) includes an external cuff (2) and an internal insert (3), through which passes material that is introduced through an opening (4) and pressure-driven by means of a piston (5) into a mould (6). The internal insert (3) has an outer diameter (d) smaller than the inner diameter (D) of the external cuff (2), there being between the two diameters (d, D), a difference of dimension (a) such that the insert (3) can be inserted into and removed from the cuff (2) directly and cold, that is, without dilating it, and such that he only dilation that the insert undergoes (3), which is caused by the heat of the material to be extruded that passes therethrough when the cylinder (1) is operating, causes the insert to become fixed inside the cuff (2).

Abstract: A PISTON FOR COLD-CHAMBER INJECTION MACHINES comprising a support (2) and an external body (3) with a sealing ring (5), joined by a bayonet lock ring (6) independent of the external body (3) and divided into two parts (6a) fitted onto a groove (21) in the support (2) and connected by long screws (7) inserted into threaded holes (61). The piston preferably includes a spring bush (4) as a part that adjusts to the container, independent of the external body (3) and of the bayonet lock ring (6), under which a conical spring ring (8) is included which exerts pressure on the two parts that form the bush (4), tending to expand the same. The piston also includes alternating transverse grooves (81) along the edges thereof for receiving conical metal tips (9) inserted through holes (63) in the bayonet lock ring (6).

Abstract: A PISTON FOR COLD-CHAMBER INJECTION MACHINES comprising a support (2) and an external body (3) with a sealing ring (5), joined by a bayonet lock ring (6) independent of the external body (3) and divided into two parts (6a) fitted onto a groove (21) in the support (2) and connected by long screws (7) inserted into threaded holes (61). The piston preferably includes a spring bush (4) as a part that adjusts to the container, independent of the external body (3) and of the bayonet lock ring (6), under which a conical spring ring (8) is included which exerts pressure on the two parts that form the bush (4), tending to expand the same. The piston also includes alternating transverse grooves (81) along the edges thereof for receiving conical metal tips (9) inserted through holes (63) in the bayonet lock ring (6).