A metal alloy injection molding device and method for manufacturing at least one piece of metal alloy or metal glass, wherein:The injection mold (2) defines a cavity having a receiving surface (4) and a forming front surface (5) aligned with the receiving surface.At least one formed sacrificial insert (7) is located in the cavity and has a back face (8), wherein at least one support area is adjacent to at least one support area of the cavity receiving surface, one front face (9) is located in front of the mold molding surface and has a hollow shape.The injection piston (11) can be moved in the mold chamber (12) and communicated with the mold fingerprint.Abbreviations: Figure 1
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