Manufacturing method and manufacturing die for producing thread bushing of barrel of plastic extruding machine

The invention discloses a manufacturing method and a manufacturing die for producing a thread bushing of a barrel of a plastic extruding machine, and belongs to the technical field of the thread bushing. The manufacturing method comprises the following process steps of: die production, pouring, heat preservation, knockout and shakeout, riser removal, shot blasting and polishing, softening and annealing, rough machining, quenching, tempering and finished product acceptance inspection after finish machining, wherein in the quenching step, the roughly-machined thread bushing of the barrel of the double-screw plastic extruding machine is uniformly heated and warmed to the temperature of 950 to 1,050 DEG C in a vacuum heat treatment furnace at a heating rate of 50 to 70 DEG C per hour, then is subjected to heat preservation for 3h to 5h, and then is cooled to 80 DEG C or below in a nitrogen cooling manner in the vacuum heat treatment furnace to be discharged out of the furnace. Aiming at the problems of relatively