Semi-closed axial extrusion die for spline shaft

The utility model discloses a semi-closed axial extrusion die for a spline shaft. A long part of the lower end of a blank is arranged in a female die cavity, the frictional force of a die cavity wall on the blank during extrusion is reduced to a certain extent, and the deformation is slight. The semi-closed axial extrusion die comprises a die carrier, a male die, a female die and an ejection mechanism, wherein the die carrier comprises an upper template, a lower template and guide pillars; an upper fixing plate and a male die sleeve are arranged below the upper template; a male die fixing sleeve is arranged in the male die sleeve; the male die is arranged in the male die fixing sleeve; a lower fixing plate and a female die sleeve are arranged above the lower template; a female die fixing sleeve is arranged in the female die sleeve; the female die is arranged in the female die fixing sleeve; the upper ends of the guide pillars are sleeved in guide sleeves; the guide pillars can slide up and down along the guid