Of course, just now Yang Hui said that the powder metallurgy disc is not good, in fact, it is not necessarily, the more common powder metallurgy disc here actually refers to the vertical extrusion powder metallurgy disc, that is, the set of technology that can only be manufactured with a 10,000-ton vertical extrusion machine.

However, it is necessary to investigate carefully, and Yang Hui finally proposed to continue to develop in-depth research and development in hot isostatic pressing technology, which can also be regarded as an early powder metallurgy technology.

The manufacturing process of HIP is to load the metal powder into a thin-walled sleeve of vacuum, and then weld the sleeve to complete the final sealing work, and then carry out HIP pressing, so that the finished metal parts with good performance can be obtained, so this technology can actually be regarded as a powder metallurgy scheme.

The biggest difference between it and HIP is that one is static pressure and the other is made by dynamic pressure, so that the powder disc produced in this way is far better than HIP manufacturing in terms of material properties.

It was also at this time that Chief Engineer Liu changed his caliber: "Okay, we can continue to use hot isostatic pressing technology to manufacture turbine discs, anyway, there is no possibility of at least 30,000 tons of vertical extruders in China, but if we want to improve the performance of turbine discs, we must be equipped with a basic equipment: 10,000 tons of hydraulic presses." ”

After speaking, Chief Engineer Liu looked at Yang Hui with a look of hope, as for Yang Hui's rejection of the vertical extrusion powder metallurgy disc scheme just now, I am afraid that he had long forgotten about it. At this time, Yang Hui suddenly realized, I am afraid that it was an excuse to engage in a vertical extruder just now, and the real target is the 10,000-ton hydraulic press proposed this time.

What the hell is going on with a 10,000-ton press? In fact, the 10,000-ton press is an extreme equipment manufacturing, which is only used in heavy industry, and the vertical extruder just now is a 10,000-ton press. The 10,000-ton hydraulic press mentioned this time is also not easy at all.

Two kinds of 10,000-ton presses are blank in China, and the whole republic has neither a 10,000-ton vertical extruder, nor a 10,000-ton hydraulic press.

Whether it is a turbine disc developed by hot isostatic pressing or vertical extrusion technology, the products they manufacture are only a bar or coil with better metal properties. After these things are manufactured, there is one more process: forging.

Only the forged turbine disc coil can really have practical use value, and it goes without saying what are the benefits of the parts forged by the press.

There are many schemes for forging turbine discs, but the best one is to use a hydraulic press for forging, the advantages of hydraulic presses in forging precision parts are incomparable, and the republic has precisely no such thing, therefore, the previous forged turbine disc also has great disadvantages in performance.

Considering these, Yang Hui really had no choice: "Okay." Isn't it a 10,000-ton hydraulic press? The company will try its best to find a way to manufacture this set of equipment, the turbine disc forged by the hydraulic press is really unusable, which strictly restricts the performance of our turbofan 10, CG-2000 and turbofan 12, and now since it is proposed, it must be solved! ”

Yang Hui had heard many times before this that the Dawn Factory had complained that the current turbofan 10 turbine disc had poor performance and low output, which had severely restricted the output of turbofan 10.

The use of hydraulic press forging precision turbine disc, which can only use die section pressure technology, can slightly improve the forging accuracy, but the whole country is only in the southwest of the Republic of China Southwest Aluminum Company has a set of 30,000 tons of die forging press.

That's it. It needs to ensure that all the precision parts of the gas turbine turbine turbine disc and other industrial systems in China are forged, plus the forging turbine disc, which is not the aspect that the hydraulic press of the die section is good at. The products it manufactures: low yield, large fluctuations in quality, and the cost will also increase significantly, what will be the result of such a turbine disc after it is manufactured?

The most direct embodiment is that the last face of the Republic of Taihang engine used the turbine disc made by this press, the mechanical properties of the turbine disc is not very good, and then there is a Taihang with a greater thrust than 31F, but not as strong and resistant as 31F. Exercise. As a military engine, it can not endure the harsh use environment of fighter jets, which is a very embarrassing problem, and has since become a big reason for the performance and life of Taihang.

Of course, these alone do not really prompt Yang Hui to make up his mind to develop a set of 10,000 tons of hydraulic press at any cost, the biggest reason is that there are now 500 orders for MPC-75. Probably split the order in half with GM's CF-34, which also required the manufacture of at least 500 CG-2000 engines.

There will also be MS-4 turbofan engines for Embraer 145, which is also a regional airliner with a market order of not less than the MPC-75, which means that at least 1,000 engines will be needed at most.

If there are at least 1,500 engines on the civilian side that need to make high-performance turbo discs, will there be fewer on the military side? Now the J-74/J-75 series engines are indeed approaching the late stage of order production, but the military aircraft use environment is different, a turbofan 10 engine is only 1600 hours, which means that a J-74/5 fighter needs three engines in a lifetime.

According to the statistics of Southwest Science and Industry, J-74/5 and J-77 have produced a total of about 500 aircraft, and before the dawn was at full power, it was only about 800 turbofan 10 engines for these aircraft, that is to say, there are at least 700 orders for the turbofan 10 of the above J-74 series fighters.

Not only that, the JF-17 Lightning, which is about to complete the finalization work and put into mass production, needs a large number of turbofan 10 engines, and then calculate the number of turbofan 10 produced by the Northeast Dawn Plant for J-82, although this engine is not produced under the banner of Southwest Science and Industry, but only Southwest Aluminum can provide turbofan 10 turbine disks in the entire Republic, and naturally Dawn Factory also has to purchase turbine disks from Southwest Aluminum.

And the J-8 is a twin-engine fighter, will the number of turbofans 10 that this guy wants to use be less? Probably, the number of production of this aircraft will not be too much, but the count of two hundred is certain.

In this way, the production number of turbofan 10 may have to exceed 4,000 units, plus other domestic businesses, in the nineties is aging Southwest Aluminum 30,000 tons of die forging machine is absolutely impossible to keep up with the huge production capacity requirements, production capacity requirements can not keep up with the demand, that is really embarrassing.

Since the 30,000-ton die forging press of Southwest Aluminum is far from enough in terms of product quality and quantity, it is now necessary to take precautions, only after the construction of the 10,000-ton hydraulic press, the problem can be solved.

After having a turbine disc with better performance, whether it is a turbofan 10 or a turbofan 12, or even a Taihang engine in the north, it can be improved in terms of operating performance. (To be continued.) )