Fabrication method of box type die forged piece boss

The invention belongs to the technical field of forged piece forming and particularly relates to a fabrication method of an aluminum alloy box type die forged piece boss. Generally, a machining mode is adopted for a portion, not easy to fill, in an aluminum alloy box type die forged piece, firstly a bar or a plate blank is heated and forged to the final sectional dimension of a prototype, and thenthe boss around a box is fabricated in a machining removal mode through a milling machine; and however, as for a forged piece with a large boss, the machining removal mode causes large waste of raw materials and causes more obvious material waste after batch production, and moreover the mode makes the forged piece flow line neither continuous nor integral and consequently leads to the results ofreducing mechanical property of the finished forged piece and shortening fatigue life. By means of the fabrication method of an aluminum alloy box type die forged piece, consumption of the raw materials is reduced, and the pro