The application discloses a spherical shell flash-free
forging forming method, which comprises the following steps: S1, composite
die preparation and debugging: a double
closed loop cavity die of a main cavity and a shunt pressure relief auxiliary cavity is adopted, the size tolerance of the main cavity is ±0.05mm, the auxiliary cavity is communicated with the main cavity through a 0.2mm-0.4mm flow limiting channel, an annular composite groove structure is arranged on the inner wall of the die cavity, the annular composite groove comprises a
macro groove and a micro groove, an elastic core die is arranged in the die cavity, the elastic core die is composed of a rigid inner core and an optim glue elastic outer layer, the error of a
pressure sensor in debugging is ≤±2MPa, a
closed loop seal is arranged on a parting surface, the die cavity is polished to Ra≤0.05μm and is sprayed with a high-temperature
lubricant; S2,
metal blank conditioning pretreatment: a matched material blank is selected, the
diameter is 1.1-1.2 times of a target spherical shell and the thickness is 1.3-1.5 times of the target spherical shell. The double
closed loop cavity and the shunt pressure relief structure are adopted, the flash is completely eliminated, the trimming process is omitted, the material
utilization rate is improved from 70%-90% to 95%-97%, the residual material of the auxiliary cavity can be recycled, and the production process is effectively simplified.