"Leader, what kind of trick is this? It is also for the development of the national defense cause! Now that our big press has been completed, we can throw off our arms and do it in many aspects. If the problem of heart disease in the aviation industry is not solved, our subsequent development will be extremely weak......" Xie Kai said with pity.

Long Yaohua almost kicked him in the face.

It's so shameless.

Looking at Zheng Yucheng and Wang Guilin, the two old foxes had expressions that didn't care about themselves.

Especially Zheng Yucheng, who actually looked at the sky with his little fingers and nostrils, this attitude deeply made Long Yaohua extremely dissatisfied.

These two old guys are getting more and more energetic, and they make Xie Kai ask himself three times a day!

"You two don't pretend to be innocent! you lack people to find your own way, do you have to let Xie Kai come forward and ask for someone, do you want face?"

Wang Guilin and Zheng Yucheng were both stunned.

They were wronged.

"Chief, this is obviously Xie Kai's own doing, what does it have to do with us?" Zheng Yucheng was unhappy, "You don't want to give it if you think it's not suitable." Our 404 is living a good life now, these projects, the faster they develop, the more money they burn, I wish the development was slow. ”

"Yes, leader, we are now relatively tight on funds, developing too fast, and under too much economic pressure...... Wang Guilin was also impatient for a while, and even glared at Xie Kai.

This kid, you want someone yourself, don't ignite fire on us.

"It's still exciting, isn't it?" Long Yaohua was extremely angry, these guys were getting thicker and thicker-skinned, and they dared to threaten themselves.

Li Mingshan couldn't cry or laugh on the side, knowing that this matter had nothing to do with Zheng Yucheng and them, but seeing their attitude, he was also dissatisfied.

Long Yaohua was forced to be anxious, in one day, Xie Kai asked for three batches of people, and they were all experienced technical backbones, how many units had suffered?

"Okay, Lao Long, let's go to the big press workshop with them and have an on-site meeting. Li Mingshan reminded Long Yaohua.

The previous ones, Ma Fengshan and the others pretended not to see them.

Now that the big press is made, all the project progress can be accelerated, and the parts forged by the big press need to go through a lot of experiments to test whether the design is reasonable and whether it can reach the use strength.

Like the Yun-10 aircraft, as long as the structural strength problem is solved and the engine is not a problem, it can be commercialized.

The main reason why the Civil Aviation Administration does not issue an airworthiness license is that the main girder and frame beam of the entire aircraft are forged in sections, and then welded together, the structural strength is not high, and the flight life is short.

With the big press, all this is effectively solved.

The 45,000-ton press, the people present, are no strangers, the success of the trial production, which means that the design requirements can basically be reached, but whether the quality and life are guaranteed is still uncertain.

Tang Zhenhua proudly introduced the baby of their unit to everyone.

There is only one in the country, although there is only one equipment in his factory, but the value is greater, and there are many people who serve this equipment.

"After the inspection of the entire turbine disc produced by the pilot machine, the internal grain structure met the expectations, and all the data such as material density, yield strength, tensile strength, etc., met the expectations, and even exceeded the expected mass ...... by about 10%."

Tang Zhenhua's data makes everyone realize that large-scale die forging machines will no longer be a bottleneck that restricts the development of the aviation industry.

"The pressure provided by the 45,000-ton die forging machine allows us to effectively solve the strength problem of the key stressed structure on the Yun Shi, just because our fourth Yun Ten is about to be produced, according to our assumptions, the main stressed parts on this aircraft are replaced by pressing method, and it will be delivered about 6 months late......" Ma Fengshan asked Cheng in detail from time to time for some specific details, and finally made a summary of the situation.

The details they understand are not the performance of the large presses, but how much production capacity the Xinyue forging plant can arrange for them.

Most of the stressed structural parts on large aircraft, such as main girders and frame beams, are aviation aluminum 6065, which can be forged.

The heating temperature of aluminum is not more than 2,000 degrees like that of superalloys, as long as more than 400 degrees is enough, and the production speed is faster.

Therefore, replacing the main stress structure of the aircraft that Xie Kai paid for privately can effectively improve the service life, which is much cheaper than producing a new one.

"What are the plans for several other planes that have already cracked their welds?" asked Li Mingshan.

"The main structure was re-produced, but this required the engine to be completely fine. Cheng replied from time to time.

In Qin Fei's test airfield, a scrapped Yun-10 has already been parked.

The one that is flying now is going to stop there soon.

"There is no need for this, the Iron Bird test bench that was moved over at the beginning has been aged, and if you modify it, you can make a more advanced Iron Bird test bench. Xie Kai said.

The technology of the Yun 10 is already relatively backward.

And Xie Kai hopes that these transport aircraft can be used to show the development process of domestic large aircraft.

"That's a later thing, so let's not talk about that. Whether the airworthiness license of the Civil Aviation Administration can be obtained is still a question. Now McDonnell Douglas's aircraft is about to be delivered, which is very detrimental to the development of Yun-10. Li Mingshan said.

McDonnell Douglas was assembled at the Shanghai Aircraft Factory, and because Xie Kai transported a large amount of technical data and technicians, the construction progress of McDonnell Douglas slowed down a lot.

The CAAC signed a contract with McDonnell Douglas to produce in China and help China train technicians and workers for aircraft assembly.

Even so, their planes are about to be assembled.

"They're not a problem, and the quality of our aircraft is up to the design requirements and it's going to put a lot of pressure on them. McDonnell Douglas wants to get more orders, either reduce prices or provide more technology, which is a good thing for our domestic aviation manufacturing industry. It is enough to help us train skilled workers. Zheng Yucheng smiled darkly.

Xie Kai's arrangement over there was finalized with him.

If you want to poach people, you can poach them now, and McDonnell Douglas's production plants in China will even bring production to a halt because of the loss of a large number of skilled workers.

This kind of thing cannot be used unless it is absolutely necessary.

"When we took over, the turbofan-6 had already completed many experiments, but it was not manufactured in batches. Whether it is the overall turbine disc or the blade, it cannot be met because of the manufacturing process...... Now that the press is complete, all that remains is processing and ......manufacturing," Sun Hong said.

The monolithic turbine disc was originally not strong enough to withstand too high temperatures.

Now both the raw materials and the forging process have met the requirements.

Monolithic turbine disc with curved blades.

And this thing needs a five-axis machining center for finishing.

The 404 got four axes, and it can even be modified with three axes to become four axes, but there are no five axes.

"The engine is not made in France, and even if the Yun-10 gets the airworthiness license, it will not be commercialized because it cannot be manufactured in batches. Mr. Ma's brows furrowed.

Pratt & Whitney's JT3D engine could have been purchased, but now, McDonnell Douglas is in China, and the resistance is greater.

It's not that the Yunshi team hasn't communicated with the United States, and they don't sell it!

The Yun-10 produced now are all the four engines imported from the United States that were tested at the beginning.

In fact, after nearly 1,000 hours of flying so far, those engines are also beginning to need repairs.

At the end of the flight life of this Y-10, it must be repaired before it can be loaded onto the new Y-10 and let the Y-10 continue to fly.

"Install four domestic engines?" Zheng Yucheng frowned.

There was silence in the room.

The big press solves not all the problems.

New problems will also be exposed when the previous problems are solved.

"In this way, the development of Yunshi still can't be accelerated?" Li Mingshan was a little regretful, "Four-axis machining center, think of a way, can't you?"

The five-axis thing, for the current China, is a legendary artifact.

At present, there are four-axis in China, and Xie Kai has built a number of Japanese four-axis machining centers from Singapore a few years ago, which have played a role in the precision machining workshop of 404, contributing to the development of China's military industry.

If the four axes can be solved, there will be no such problem, right?

"No, you can't. The turbine blades on the integral turbine disc are three-dimensional curved surfaces, and when machining, especially finishing, the rotating spindle must be able to swing to complete the processing at one time, and it cannot be solved by tooling...... "Jiang Chenyang also said that there must be five shafts to solve the manufacturing of the turbine disk. "Not only the overall turbine disk, but also many parts of the engine that require a five-axis ......"

Xie Kai listened all the time and didn't speak.

He knows better than anyone what the reason for the fact that four-axis, five-axis or even high-precision three-axis machining centers are called absolute military strategic equipment.

The more high-precision something is, the more inseparable it is.

Ninth-level fitters can't process this.

Take a file to frustrate?

Let's not talk about how difficult nickel-based superalloys are to process, and we don't discuss whether the quality is acceptable, just the large amount of processing of this turbine disc, a fitter can't frustrate a turbine disc in a year!

And there can be no mistakes anywhere.

The thickness of the leaves must be even......

One engine with nine or more turbine discs!

In this world, there are many that are difficult to solve even for ninth-level fitters.

Otherwise, China's high-tech industry would not have developed so slowly.

"The five-axis thing, the Soviet Union is not easy to get, it is an absolute strategic equipment in the Batumi embargo. Wang Guilin shook his head, "At present, the four-axis machining center in our base is not fully mature, mainly because the mechanical manufacturing and assembly accuracy of the production unit cannot be reached, and the five-axis control system is still in the research stage." ”

"In this way, if we don't solve the problem of the five axes, is it possible for the aviation industry to throw off its arms and do a big job?" asked Long Yaohua.