Forging forming method and die for pipe plates with different wall thicknesses

The invention discloses an unequal-wall-thickness pipe plate forging forming die which comprises a forming male die, a female die, a female die base plate and a mandrel, and further provides an unequal-wall-thickness pipe plate forging forming method which comprises the following steps that (1) an equal-wall-thickness pipe is subjected to broaching, specifically, the equal-wall-thickness pipe is placed on the female die, the male die moves downwards by a certain distance, and the equal-wall-thickness pipe is subjected to broaching; after moving to a lower limit, the male die is kept static with a constant load, and the upper die and the lower die are matched to finish the reaming action. (2) the expanded pipe is subjected to first local thickening, specifically, the expanded pipe with the equal thickness is placed on a female die base plate, an upper die moves downwards, and thickening forming of the expanded area is completed; and (3) the pipe thickened for the first time is placed on a female die base plate