Rebirth of Military Workers

Chapter 765

“Leader, this is not for you. It is also for the development of the national defense industry! Now that we have done the big press, we can get rid of our arms in many aspects. If the heart disease problem in the aviation industry is not solved, our follow-up development will be Extremely weak…” Xie Kai pretended to say pitifully.

Long Yaohua almost kicked him in the face.

It’s shameless.

Looking at Zheng Yucheng and Wang Guilin, these two old foxes had nothing to do with their expressions.

In particular, Zheng Yucheng used his little fingers to dig his nostrils and look at the sky. This attitude deeply made Long Yaohua extremely dissatisfied.

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

“You two don’t pretend to be innocent! If you don’t need people, think of a way by yourself. You have to let Xie Kai come up with someone, don’t you want to face it?” Long Yaohua’s fire, he almost lit himself.

Both Wang Guilin and Zheng Yucheng were stunned.

They were wronged.

“Director, this is obviously Xie Kai’s own work. What does it have to do with us?” Zheng Yucheng was unhappy. “You don’t want to give it to you if you don’t think it is appropriate. Our 404 is now living well. These projects develop faster The more money I burn, the more I want to develop more slowly.”

“Yeah, leader, we are now relatively tight on funds, developing too fast, and economic pressure is too great…” Wang Guilin was also impatient for a while, even glaring at Xie Kai.

This kid, you want someone yourself, don’t set fire on us.

“It’s still exciting, right?” Long Yaohua was very angry, these guys became thicker and thicker, and they dared to threaten themselves.

Li Mingshan was also dumbfounded, knowing that this matter had nothing to do with Zheng Yucheng and the others, but seeing their attitude, he was dissatisfied.

Long Yaohua was forced to be in a hurry. Within a day, Xie Kai asked for three groups of people, all of whom were experienced technical backbones. How many units were affected?

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

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

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

Like the Yunshi aircraft, as long as the structural strength problem is solved and the engine has no problem, it can be commercialized.

The main reason why the Civil Aviation Administration did not issue an airworthiness license is that the main girder and frame girder 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 a large press, all of this has been effectively resolved.

The 45,000-ton press is familiar to all the people present. The successful trial production means that the design requirements can basically be met, except that the quality and life expectancy are still uncertain.

Tang Zhenhua proudly introduced the treasure of his unit to everyone.

There is only one in the country. Although his factory has only one equipment, the value is greatly increased, and there are many people serving this equipment.

“After the inspection of the overall turbine disk produced by the test machine, the internal grain structure has reached the expected, and all the data such as the material density, yield strength, and tensile strength are in line with expectations, and even the quality is about 10% higher than expected…”

Tang Zhenhua’s data made everyone realize that large die forging machines will no longer be a bottleneck restricting the development of the aviation industry.

“The pressure provided by the 45,000-ton die forging machine allows us to effectively solve the problem of the strength of the key stress structure on the YX. It just happens that our fourth YX is about to be completed. According to our vision, the main load on this aircraft is The force parts are replaced by pressing methods and will be delivered about 6 months later…” Ma Fengshan and Cheng asked about some specific details from time to time, and finally made a summary of the situation.

The details they know are not about the performance of the large press, 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 beams and frame beams, are aluminum materials such as aviation aluminum 6065 that can be forged.

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

Therefore, replacing the main stress structure of the plane that Xie Kai paid for privately can effectively increase the service life, which is much cheaper than reproducing one.

“How do you plan on the other planes that have cracked welds?” Li Mingshan asked.(Read more @ wuxiax.com)

“The main structure is re-produced, but this requires the engine to be completely ok before it can proceed.” Cheng answered from time to time.

In Qin Fei’s test airfield, a scrapped Yun-10 plane had been parked.

The one that is flying right now will stop there soon.

“This is not necessary. The iron bird test bed that I moved over is already aging. If you modify it, you can make a more advanced iron bird test bed.” Xie Kai said.

The technology of that aircraft is relatively backward.

And Xie Kai hopes to show the development history of domestic large aircraft through these transport aircraft.

“That’s the next thing, let’s not talk about it. Whether it can obtain the airworthiness license of the Civil Aviation Administration of China is still a problem. Now the McDonnell Douglas aircraft is about to be delivered, which is very detrimental to the development of Yunshi.” Li Mingshan said.

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

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

Even so, their aircraft will soon be assembled.

“They are not a problem. The quality of our aircraft meets the design requirements, which will put tremendous pressure on them. If McDonnell Douglas wants to get more orders, it will either cut prices or provide more technology. This is for our domestic aviation manufacturing industry. It’s all good things. Just helping us train skilled workers is enough.” Zheng Yucheng smiled sullenly.

Xie Kai’s arrangement there at the time was finalized with him.

If you want to dig people, you can dig them away now. McDonnell Douglas production plants in China will even stall production due to the loss of a large number of skilled workers.

This kind of thing is not a last resort and cannot be used.

“When we took over the turbofan-6, we had completed a lot of experiments, but did not form a mass production. Whether it is a whole turbine disk or a blade, because the manufacturing process can not meet… Now the large press is completed, only processing is left. Manufacturing…” Sun Hong said.

The overall turbine disk was originally due to insufficient material strength to withstand too high temperatures.

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

The integral turbine disc has curved blades on it.

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

The 404 has four axes, and it can even be modified from three axes to four axes, but there is no five axes.

“The engine is not made in France. Even if Yunshi gets the airworthiness license, it will not be commercialized because it cannot be manufactured in batches.” Mr. Ma frowned.

It was originally possible to purchase Pratt & Whitney’s JT3D engine, but now, McDonnell Douglas is in China, and this has great resistance.

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

The Yunshi currently produced are all the 4 engines imported from the United States of the first Yunshi that was flown in the test flight.

In fact, it has accumulated nearly a thousand hours of flying so far, and those engines have also begun to need repairs.

After the YX flight life is over, it must be repaired before it can be installed on the new YX, and the YX can continue to fly.

“Four domestic engines?” Zheng Yucheng frowned.

There was silence in the conference room.

The big press solves not all problems.

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

“So, can the development of Yunshi still not be able to speed up?” Li Mingshan was a little regretful, “Four-axis machining center, think of a way, can’t it?”

For the current China, the five-axis thing is a legendary fetish.

There are already four-axis machining centers in China, and Xie Kai built a batch of Japanese four-axis machining centers from Singapore a year ago. They have already played a role in the precision machining workshop of 404, contributing to the development of China’s military industry.

If the four-axis can be solved, there will be no problem, isn’t it?

“No. The turbine blades on the overall turbine disc are three-dimensional three-dimensional curved surfaces. When processing, especially for finishing, the rotating spindle must be able to swing to complete the processing at one time. It cannot be solved by tooling…” Jiang Chenyang also said that it must It takes five shafts to solve the problem of manufacturing turbine discs. “Not only is the overall turbine disc, there are also many parts on the engine that require five shafts…”

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

He knows better than anyone that the four-axis, five-axis or even high-precision three-axis machining center is called an absolute military strategic equipment, and what is the reason.

The more high-precision things, the more inseparable from this stuff.

Nine-level fitter can’t process this.

Frustrated with a file?

Let’s not talk about how difficult it is to process nickel-based superalloys, nor whether the quality is acceptable. It is just the large amount of machining of this turbine disc. A fitter can’t produce a turbine disc in a year!

And there can be no errors in any one place.

The thickness of the blades must be uniform…

An engine has nine or more turbine discs!

In this world, there are many 9-level fitters that are difficult to solve.

Otherwise, China’s high-precision and cutting-edge technology industry will not develop so slowly.

“The five-axis thing is not easy for the Soviet Union to obtain. 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 the production unit machinery. The manufacturing and assembly accuracy cannot be achieved; and the five-axis control system is still in the research stage.”

“In that case, without solving the five-axis problem, is it impossible for the aviation industry to get rid of its strengths?” Long Yaohua asked.