Isothermal forging method for titanium alloy blade

The invention discloses an isothermal forging method for titanium alloy blade, which is implemented by the following steps: (1) coating lubricant on the surface of pre-forged titanium alloy blade blank; pre-heating with an electrothermal furnace to the deformation temperature of the blade blank; (2) fixing a lower die holder in an isothermal molding heater, and respectively fixing the upper die and the lower die on the upper die holder and lower die holder; (3) fixing the isothermal molding heater on a hydraulic press, heating to 900-930 DEG C and maintaining the temperature for at least 3h; (4) taking the blade blank out of the electrothermal furnace, putting into the upper die and the lower die in the isothermal molding heater, forging by the hydraulic press, and controlling the hydraulic press to perform return stroke operation when the dimension of the blade blank satisfies the requirement. The titanium alloy blade blank obtained by the inventive method has a preciseness satisfying technical requirement and obviously improved mechanical property.