Patent ID: 8201612

Claim:
A process for manufacturing a single-crystal turbomachine nozzle guide vane comprising an airfoil between two platforms, the process comprising: pouring molten metal into a shell mold followed by directional solidification, the front of which advances vertically upward, from a single crystal provided by a single-crystal grain provider device placed in a lower portion of the mold and having a predetermined orientation, a [001] direction coinciding with a vertical direction, volumes of the mold forming the platforms being oriented in a plane parallel to the [001] direction of said single crystal and a volume of the mold forming the airfoil comprising a lower edge, wherein the device providing the single-crystal grain emerges in a grain duct forming a connection between said device and the lower ends of the platforms, the grain duct comprising two vertically extending branches for feeding the platforms and a web-shaped volume extending between said feed branches, the platforms and the lower edge of the airfoil, a thickness of the web-shaped volume is less than a thickness of the branches, wherein the thicknesses are measured in a direction perpendicular to the vertical direction, and wherein an upper edge of the volume forming the airfoil is inclined with respect to a horizontal direction.