The Military-industrial Scientific Research System of the Academic Master - Chapter 182
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Chapter 182 The future of JH-7
After such a long preparation, it was almost natural for Zhang Zhenhua to agree to the suggestion made by Chang Haonan.
“In that case, let’s start discussing some specific technical issues.”
Chang Haonan sat back in his seat again.
Having experienced later generations, he knows very well that technology research and development is a two-way process.
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.
So whether it is the 430 factory or Chang Haonan, who is preparing to take part in the 973 project, they have to quickly come up with something short, flat and fast.
It does mean that I am eager for quick success, but this is the rule of doing projects.
This is also the rationality of the trade, industry and technology route. First do business, achieve a certain amount of primitive accumulation, and survive, and then develop new technologies and products, sell them, and find new profit growth points.
It’s just that some people are just doing it and 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 Save this fan 9 project.”
“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 The aviation unit has some confidence.”
“As for those that cannot be dealt with immediately, we can make a list first. The same problems may also be encountered in future turbofan 10 projects. We will prioritize them in the order of easier and then harder 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 complexion 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 papers from the pile of documents 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 items in a row, all of which are problems that have troubled 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 simply a matter of technical ability.
Even in countries with a higher level of materials science, it is difficult to achieve a 1:1 restoration based on the finished product in hand.
The processing method is the same.
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 needed 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 **** 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 can be solved immediately is the most critical part.
Dozens of JH-7s are in urgent need of wearing parts, and these aircraft are the absolute main force of the naval aviation force at the moment.
Once a large-scale den is discovered, 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.
However, he soon showed a worried look:
“Chang Gong, if these parts are ground using your new process, the consumption of soft abrasives should be very large, right?” He still remembered the technical document he had seen before, which stated the use of abrasives. Lifespan ranges from 0.5-8 hours.
When I watched 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 a worker to replenish the consumed abrasives.
“Hmm…that’s true.”
Chang Haonan naturally has no need to hide anything in this regard:
“The specific length of time 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 effect 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.
It was then that Chang Haonan understood 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?”
Zhang Zhenhua, suddenly enlightened, was completely relieved.
“But, Director Zhang.”
Chang Haonan picked up a pencil and lightly tapped on one of the drawings:
“I 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 opinion.
This is the personal thought of the person who transformed the Turbojet 14.
Got to take notes quickly!
“The 603 Research 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. Moreover, they were also the suppliers that provided power to Feibao, so they naturally knew this:
“However, the 603 Institute hopes to use fully 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 the JH-7A was about, 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 stops, it is still 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, SPEI MK202 has little potential for comprehensive optimization, we still cannot ignore a seemingly small defect that directly affects reliability and lifespan.
Moreover, it is not troublesome to modify them, 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 Category 1 flight accidents.
Like the Yun-8 aircraft with ice on its wings, it is also one of the greatest surprises in the history of the aviation industry.
The model of Turbofan 9 was originally gradually improved through accidents.
(End of this chapter)