Chapter 182 The Future of JH-7
After such a long preparation, it was almost natural for Zhang Zhenhua to agree to the suggestion put forward by Chang Haonan.
"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.
So whether it is the 430 factory or Chang Haonan, who is preparing to participate in the 973 project, they have to 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 To solve your immediate urgent needs, we can at least produce some results and save the Turbofan 9 project first."
"So, Director Zhang, you can tell us in detail what you encountered during the localization process. We analyze various problems that can be solved in a relatively short period of time, and focus on them first, which can give some confidence to the higher-level departments and the aviation force."
"As for those that cannot be dealt with immediately. , you can make a list first. The same problems may also be encountered in the future turbofan 10 project. We will prioritize them in the order of easy and then difficult 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 lubricating oil remaining in the sealing ring will It coked, the floating ring got stuck, and there was friction with the shaft body, and the sealing effect declined quickly. Ground crew almost had to clean this structure after every flight, but the actual lifespan was still only about half of the expected, so the imported parts were consumed. Very 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 machines is Bei has just entered the intensive overhaul period, and the production cannot keep up with the consumption. The troops are very dissatisfied."
As he spoke, he pulled out one of the papers from the pile he brought and pointed at it. An inconspicuous ring-shaped part said:
“This is it.”
"In addition, there is a locking plate 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 have 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 things in a row, all of which are problems that have 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 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 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 program, you don’t need to worry about this, you can send people to the 410 factory for further study.”
Hearing this answer, Zhang Zhenhua breathed a sigh of relief.
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 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.
Now that we can meet the overhaul and maintenance needs of these aircraft, it is a turnaround for Factory 430.
However, he soon showed a worried look:
“Chang Gong, if these parts are ground using your new process, how much consumption of soft abrasives will there be? "It should be very big, 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...this is true."
Chang Haonan naturally has no need to hide anything in this regard:
"How long it can be used depends on the workpiece to be processed. materials, but they must be replaced frequently, otherwise the expected results will not be achieved.”
“Then the cost of this abrasive...”
Zhang Zhenhua smoothed his hair a little embarrassedly:
“I see that the abrasive formula contains silicon carbide. It seems to be a very valuable thing. I remember that our country still needs to import it.”
< br>No way, the 430 factory is really tight in terms of money, and the turbofan 9 has been unable to be manufactured for a long time, while the turbojet 8 is only equipped on the H-6, and its usage is very small.
At this time, Chang Haonan understood what the other party was worried about:
"Director Zhang doesn’t have to worry about this. The kind of silicon carbide that needs to be imported is electronic-grade semiconductor silicon carbide. Our abrasive What is used inside is the most common silicon carbide for coatings and construction, which can be made in China, and the purchase price is less than one thousand yuan per ton. ”
"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:
"About Turbofan 9 , I also have some personal thoughts.”
"Please tell me!"
Zhang Zhenhua immediately opened the notebook in front of him -
This is Chang Haonan's personal idea.
This is the personal thought 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.”< br>
Zhang Zhenhua nodded. The connection between Factory 430 and Institute 603 is quite close. Besides, they were also the suppliers that provided power to Feibao, so they naturally knew this:
"But that of Institute 603 Bian hopes to use full digital design for this project, but there is a shortage of talents in this area, so the progress is not very fast. ”
The speaker is unintentional and the listener is intentional.
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 It is a twin-engine aircraft, but when flying at ultra-low altitude, even if only one engine is stopped, it is easy to cause an irreparable accident.”
"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 nothing There is potential for comprehensive optimization, but we still cannot ignore a seemingly small defect that directly affects reliability and lifespan.
Besides, it is not troublesome to modify them, and they will not even affect the whole body.
In the previous life, many JH-7s malfunctioned at ultra-low altitudes, and the second-generation ejection seats they were equipped with had poor performance, which ultimately led to multiple Category 1 flight accidents.
Like the Y-8 with icy wings, it can be regarded as one of the most difficult events in the history of the aviation industry.
The Turbofan 9 model was originally gradually improved through accidents.
(End of this chapter)