For the fighter's structure manufacturing, the fuselage of the box is the most important, most time-consuming, but also the most expensive parts, but also to limit the fighter production capacity and performance of the key link. Especially those who at the expense of the performance of the main air combat fighter, often difficult to use titanium alloy as a material, which in turn led to increased costs and limited production capacity of the contradictions.

For the fighter's structure manufacturing, the fuselage of the box is the most important, most time-consuming, but also the most expensive parts, but also to limit the fighter production capacity and performance of the key link. Especially those who at the expense of the performance of the main air combat fighter, often difficult to use the titanium alloy as a material, which in turn led to increased costs and limited production capacity of the contradictions.

For the main bearing parts on the fighter, the pure 3D printing titanium alloy is still not Kaopu stuff - this thing is the accumulation of titanium powder powder, with laser burning together and then cured, a little bit of the heap Out of the. The structure of loose a large number of bubbles and non-melting powder, sudden hot quenching material within the serious tissue dislocation, stress residues are from the principle can not be avoided.

High-performance fighter's large frame, must rely on forging in the mold to form a basic shape; in a long time to maintain the great pressure, high temperature softening of the metal rough like a strong kneading dough, like the internal loose tissue, Defects will be all eliminated by compaction. However, forging out of the product, but also after hundreds of hours of processing, remove the excess part, so that it fully meet the design shape size, and heat treatment and other follow-up process, through the quality inspection to be completed production.

Domestic by 2013, the domestic can be put into use only a 30,000 tons of forging press; its forging capacity for aluminum alloy maximum projection area can not exceed 2 square meters, titanium alloy projection area can not exceed 1.2 square meters. And this level is completely enough to complete the F-20 such a double-heavy fighter's titanium alloy frame forged.

Under such restrictions, the J-20 titanium alloy frame, only in the design of the first divided into several forging, respectively, after forging, and then use the electron beam welding process into a whole. This process is derived from China's introduction of the Soviet Union when the full set of technical system, the same time the Soviet Union large titanium alloy forging capacity is far better than the United States out of the workaround.

On April 10, 2013, China's second group developed the world's largest 80,000 tons die forging machine successfully achieved the trial production. China in the large-scale aerospace forging parts manufacturing capacity has been a fundamental breakthrough to reach the world's top level. For the J-20, this means that it can use a complete shape of the titanium alloy frame, its life will be a huge breakthrough.

Due to the F-20 before the prototype of the manufacturing machine, too late and so on 80,000 tons of mold put into use, plus 80,000 tons die forging machine is unlikely to trial production performance status is not yet stable, the application In the J-20 large box of production; it can be speculated that the overall situation with the titanium alloy F-20 should be put into production in 2014.

From the current situation, there is reason to believe that the use of the Air Force annihilated J-20 have been used in the overall titanium frame, its structural life than the early prototype to be excellent.

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