The military-industrial scientific research system of the academic master.

After such a long preparation, it was almost natural for Zhang Zhenhua to agree to Chang Haonan's suggestion.

"In that case, let's start discussing some specific technical issues."

Chang Haonan sat back in his seat.

Having experienced later generations, he knows very well that technology research and development is a two-way affair.

Although there is definitely a problem with the comprador mentality that buying is worse than renting, but on the other hand, users have invested money and decision-makers have taken the pressure. If the R&D unit is unable to let them receive positive feedback for a long time, then others will have no regard for independent research and development. It is normal to hesitate about something.

Therefore, both the 430 factory and Chang Haonan, who is preparing to participate in the 973 project, must quickly come up with something short, flat and fast.

It is indeed a bit eager for quick success, but this is the rule of doing projects.

This is also the rationality of the trade, industry and technology route. Do business first, achieve a certain primitive accumulation, and survive, and then develop new technologies and products, sell them, and find new profit growth points.

It’s just that while some people are doing it, they only focus on primitive accumulation and forget all the work and skills behind it.

But Chang Haonan is obviously not such a person:

"Abrasive flow machining is just the beginning of the Seiko Plan, but grinding has always been our shortcoming, so I think this technology should be able to solve your immediate needs, and at least produce some results. First, we can solve the vortex The Fan 9 project will be saved.”

"So, Director Zhang, can you tell us in detail about the various problems encountered in the localization process? We will analyze and analyze which of them can be solved in a relatively short period of time. We will focus on the key problems first, which can also be considered as a report to the higher-level departments, and Some confidence in the aviation unit."

"As for those that cannot be dealt with immediately, we can make a list first. The same problems may also be encountered in the future turbofan 10 project. We will follow the order of easier first and then harder, and regard them as the key research and development directions of the Seiko Plan."

"In addition to deep holes and thin tube workpieces, there are indeed many problems faced in processing."

Zhang Zhenhua's expression also relaxed slightly:

"For example, the high-pressure turbine bearing of an engine uses a floating ring sealing device. When the bearing temperature rises during use, the oil remaining in the sealing ring will coke, causing the floating ring to get stuck, causing friction with the shaft body, and the sealing effect will decrease. Soon, the ground crew had to clean the structure almost after every flight, but the actual lifespan was still only about half of the expected, so the imported parts were consumed quickly."

"But the manufacturing process of this floating ring is very demanding. It took us almost two years to produce a qualified product, but now the production speed is also very low. The first batch of installed Sibei machines has just reached the intensive overhaul period, and the output It can’t keep up with the consumption at all, and the troops are very dissatisfied.”

As he spoke, he pulled out one of the documents from the pile he brought, pointed to an inconspicuous ring-shaped part on it and said:

"This is it."

"In addition, there is a locking piece at the root of the high-pressure rotor blade of the fan of Spey MK202. Its function is similar to the two pins on the R15 engine. It is used to fix it with the tongue and groove. This is also a consumable part that is in great demand in the army. We ourselves Because the roughness of the manufactured locking plate is not up to standard, it is easy to change the natural vibration frequency of the blade. When the blade is close to the maximum speed, resonance occurs and damages the engine. As a result, many pilots do not dare to push the throttle when flying the overhauled Flying Leopard... …”

"..."

I mentioned more than ten points in a row, all of which were problems that had troubled the 430 factory for a long time.

Imitation, especially when there is a lack of technical data, actually has many unique troubles.

Especially when it comes to materials and processing techniques.

This is not even just a matter of technical ability.

Even in countries with a higher level of materials science, it is difficult to achieve a 1:1 restoration just by relying on the finished product in hand.

The same goes for processing.

The British only transferred technology and equipment, and did not send people to teach them step by step like Maozi did back then, so many areas that required experience had to be explored bit by bit.

Chang Haonan looked down at the pile of drawings spread out in front of him, and quickly sorted out the priorities in his mind:

"As for the floating rings, rotor lock plates and bearing balls you mentioned, they are all similar to the processing of pipelines and deep holes. Our new abrasive flow processing method can completely handle it, but it only needs to be replaced with new abrasive formulas and PLCs. Control procedures, you don’t need to worry about this, you can send people to the 410 Factory for further study.”

Zhang Zhenhua breathed a sigh of relief after hearing this answer.

The problem that Chang Haonan said could be solved immediately happened to be the most critical part.

Dozens of JH-7s are in urgent need of wearing parts, and these aircraft are the absolute main force of naval aviation at the moment.

Once there is a large area of ​​squatting, it will be a big deal that will break the sky.

This is why the proposal to buy another batch of second-hand Spey MK202 will be considered by the above.

Being able to meet the overhaul and maintenance needs of these aircraft now is a turnaround for Factory 430.

But he soon showed a worried expression:

"Chang Gong, if these parts are ground using your new process, then the consumption of this soft abrasive should be very large, right?"

He still remembered the technical documents he had seen before, which stated that the service life of abrasives ranged from 0.5 to 8 hours.

When watching the processing process on site during the day, it was true that waste abrasives continued to be discharged from the fixtures. Factory 410 even specially arranged for a worker to replenish the consumed abrasives.

"Well...that's true."

Chang Haonan naturally has no need to hide anything in this regard:

"How long it can be used depends on the material of the workpiece to be processed, but in short, it must be replaced frequently, otherwise the expected results will not be achieved."

"Then the cost of this abrasive..."

Zhang Zhenhua stroked his hair a little embarrassedly:

"I see that there is silicon carbide in the abrasive formula. It seems to be quite valuable. I remember that our country still needs to import it."

There is no way, the 430 factory is really tight in terms of money, and the turbofan 9 has been unable to be manufactured, while the turbojet 8 is only equipped on the H-6, and its usage is very small.

Only then did Chang Haonan understand what the other party was worried about:

"Director Zhang doesn't have to worry about this. The silicon carbide that needs to be imported is electronic-grade semiconductor silicon carbide. The abrasive we use is the most common silicon carbide for coatings and construction. It can be made domestically. The purchase price is per ton. It’s less than a thousand dollars.”

"Is that so?"

Suddenly enlightened, Zhang Zhenhua was completely relieved.

"But, Director Zhang."

Chang Haonan picked up a pencil and lightly tapped on one of the drawings:

"I still have some personal thoughts about Turbofan 9."

"Please tell me!"

Zhang Zhenhua immediately opened the notebook in front of him——

This is Chang Haonan's personal idea.

These are the personal thoughts of the person who transformed the Turbojet 14.

Gotta take notes quickly!

"The 603 Institute should be developing a deeply improved version of the JH-7, right?"

This matter should not be a secret within the aviation industry, but Chang Haonan still used a question.

"Yes, the current JH-7 is mainly used by the navy. The air force has invested a lot of money because the combat concept is more complex, hoping to obtain an improved model with better performance."

Zhang Zhenhua nodded. The connection between Factory 430 and Institute 603 was quite close. Besides, they were also the suppliers that provided power to Feibao, so they naturally knew this:

"However, Institute 603 hopes to use full digital design for this project. There is a shortage of talents in this area, so the progress is not very fast."

He does not mean that.

Yao Mengna, who had been sitting in the corner without speaking, suddenly lit up, as if she had thought of something.

But no one noticed her thoughts at this time.

Chang Haonan naturally knew what was going on with the JH-7A, so he continued almost without thinking:

"The Air Force has higher requirements for ultra-low-altitude penetration in complex terrain. Although the Flying Leopard is a twin-engine aircraft, when flying at ultra-low altitude, even if only one engine is stopped, it is easy to cause irreparable accidents."

"In this case, why not take this opportunity to completely solve some of the problems you just mentioned, which can also be regarded as eliminating some hidden dangers in flight safety."

Although generally speaking, Sibei MK202 has no potential for comprehensive optimization, but it still cannot be ignored for a seemingly small defect that directly affects reliability and lifespan.

Moreover, they are not troublesome to modify, and they will not even affect the whole body.

In the previous life, many JH-7 aircraft malfunctioned at ultra-low altitudes, and the performance of the second-generation ejection seats they equipped was poor, which ultimately led to multiple Class I flight accidents.

Like the Y-8 with icy wings, it can be regarded as one of the most unpredictable incidents in the history of the aviation industry.

The Turbofan 9 model was originally gradually improved through accidents.