According to the structure characteristics of 140MPa annular blowout preventer shell,the advantages and disadvantages of three forging schemes are analyzed.The process scheme of cogging with free forging combined with loose tooling forging is adopted.Make the billet by free forging,after large deformation,the inside of the forging is fully forged,the casting defects are eliminated;by loose tooling forging,the forging is formed in the die,the shape and size are close to the parts,the machining allowance of the forging is decreased,the waste of materials is reduced,and the machining efficiency is improved.The forming scheme of free forging combined with loose tooling forging is feasible.
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