Chapter 1034 The British Four-Stage Strategy for Solving Problems
After determining the specific direction to solve the problem, Hang Zhibin and others quickly returned to work.
About a month later, they finally succeeded in producing a bulk 4722 titanium aluminum alloy substrate that met the requirements.
Although there is still a big gap between the upper limit of volume, product density and molding accuracy compared to the British materials of the same type, Chang Haonan did not really want to directly use these domestic substrates to produce blades.
If it is just used as a basic consumable in the process development process, the requirements are actually not that high.
Therefore, when the second batch of blades supplied by Rolls-Royce arrived, he had almost completed the development of the basic database and process parameter calculation method for 4722 alloy.
The next task is basically the same as when dealing with nickel-based alloys.
Of course, in order to meet higher production standards, the requirements for the precision of the processing parameters of the low-pressure turbine disk will also be higher.
It will inevitably take longer to determine.
But no matter what, the most difficult level is over.
As for the high-pressure turbine part that was assigned to Zhang Zhenhua from the beginning, the development process was even more uneventful.
There were some minor twists and turns during the process, which were basically due to the lack of experience of several key members.
It wasn't even Chang Haonan's turn to intervene directly, but it was solved directly in several technical seminars.
In the end, it brought about a happy trouble -
Due to the requirements of Rolls-Royce headquarters, the date of the subcontract signed between Haofa Group and Xiluo Company was written At the end of the year.
However, it has not yet reached November, and the former has already produced a product that has been fully qualified after testing...
So much so that it cannot be delivered at all.
On the other hand, the ultra-short laser processing equipment provided to Haofa Group is still in the process of debugging.
Even if mass production is really going to happen, it will still take several months.
According to general principles, if Party A does not sign and mass production does not start, then the project team must be maintained and cannot be disbanded.
Chang Haonan has other things to be responsible for. For example, the Air Police 2000 has already started to be renovated at Haofei, not far away. He needs to install his own Air Force data link system for future testing.
But other people in the R&D team certainly cannot run away casually.
Especially Hang Zhibin and his party who came from 621.
Out of concern about the situation early next year, Chang Haonan doesn't want them to return to Beijing at this juncture.
So, after all, we have to find other related things to do.
So, at the last seminar in October, which was most likely the last seminar before samples were delivered, everyone began to brainstorm on this matter.
In fact, considering the time at the end of 2002, and the fact that the Trent 900 is the world's top high-bypass ratio turbofan engine, the first thing that almost everyone thinks of is the Turbofan 20.
According to the plan, after Haofa officially started mass production of orders for Rolls-Royce and the successful first flight of SeA650, it was time to start the Turbofan 20 project based on the experience accumulated from these two projects.
It is still the way to concentrate on attacking difficult problems, with Haofa as the main force, supplemented by several brother units such as Shengjing, Rongcheng and Zhucheng.
It just won’t be as big as the turbofan 10 back then.
Therefore, Hang Zhibin and others immediately stated that the improved titanium-aluminum alloy they were developing could be used as a pre-research project for the Turbofan 20, and they would consider using the rear 2-3 low-pressure turbines of the Turbofan 20 as well as the first two-stage high-pressure compressors. Material replaced with titanium alloy.
Referring to the situation of Trent 900, it can probably bring about a weight loss of about 160-200 kilograms.
You must know that an engine with a thrust volume of 13-15 tons such as the Turbofan 20 has a dead weight of only about 3 tons.
It is equivalent to a reduction of about 1.5% at one time.
Without changing the overall engine design, this is already a very impressive number.
Even Chang Haonan was inevitably a little tempted.
However, he finally gave up this slightly radical proposal.
After all, the low-pressure turbine and the high-pressure compressor are both components of the core machine. Once they change, it will be a big move. The core machine of the turbofan 20, which relies on the turbofan 10, is supposed to be a core machine with a short development cycle and A model that focuses on training the R&D team without much risk.
Even the Y-9 transport aircraft that is expected to be equipped with turbofan 20 has already entered the structural strength verification stage, and wind tunnel testing will begin soon.
There really isn’t much room for trial and error.
The new titanium alloy is still at the stage where the figure has just been dipped in ink. It may take some time to truly complete the research and development and improve the molding process to a level sufficient to produce turbine blades.
This is not to mention that due to the different surface properties of different materials, the heat-resistant and anti-oxidation coatings originally used for nickel-based alloys have poor adhesion on titanium alloys, so new coating systems need to be developed, and Domestic research on traditional processing methods such as hot press rolling, casting, and forging of titanium alloys is not enough...
In short, if you want to open up a new branch line in this three-acre land of manufacturing, it will definitely take a few steps. It will take three or two years for our company to solve the problem.
Including several other ideas related to Turbofan 20, they were all rejected for similar reasons.
In the end, Chang Haonan even thought about how to directly carry out the preliminary research and development of the Turbofan 20 in the name of the current "Trent 900 Turbine Production Project Team".
Anyway, he has done similar things before.
The only problem is that after all, this project team uses British funds, and it may not be easy to do the accounting later...
Fortunately at this time, Ren Bingda, who had not spoken just now, Suddenly he said:
"Mr. Chang, I remember when we first received the technical information from the British, you seemed to have said that the Trent 900 had certain design flaws?"
This came out of the blue. The change of topic made Chang Haonan a little stunned:
"Not exactly..." After hesitating for a moment, he gave an uncertain answer:
"It does not have an anti-overrotation design on the turbine structure, but after all, I also I have not seen the complete design of the Trent 900, so I am not sure if there are other alternatives..."
"Then...do we need to tell this matter? Luo Luo, and then make an improvement plan based on this? "
Ren Bingda asked:
"On the one hand, it is to train for the Turbofan 20, and on the other hand... it is also to prevent the Trent 900 from having an accident in the future and throwing the blame on the turbine blades we produce."
"Hiss..."< br>
Chang Haonan immediately made a tactical retreat.
When he first heard the first half of the other person's question, he was almost ready to refuse without thinking.
Rolls-Royce is not a brother unit under the same group. It is just a business cooperation. The main theme is to give up helping others and respect the fate of others.
Just do what is stipulated in the contract and that's it.
But Ren Bingda’s explanation later made Chang Haonan have to think carefully.
Given the peeing habits of the British and Japanese, if something happens, at least until the investigation results come out, some wrangling will be inevitable.
The investigation of aviation accidents... takes a long time.
As a new player that has just entered the aviation manufacturing industry, Huaxia, even if it is reasonable, has to guard against it for the sake of reputation...
But then again, if Luo Luo solves the problem like this, on the one hand it will be a bit of a loss, and on the other hand it may not be a good outcome.
As the saying goes, there is no such thing as a good doctor.
Some defects will only attract attention when they actually cause problems.
Say it in advance, others may think you are looking for trouble.
“You’re right.”
Chang Haonan nodded:
"However, the improvement plan has to be done. After it is completed, it should be left in our own hands."
"As for the design flaws... we don't need to If you want to mention it specifically, you can wait until the samples are delivered later and attach a risk warning statement to the production documentation.” It's up to them to find a solution. After all, we play an important role in it. Even if this matter is used for publicity in the future, no one can find fault."
"If they don't pay attention, then it's okay anyway. Keep the details in writing. If something happens in the future, just turn over the documents signed by both parties and leave the rest of the matter to the Japanese and British to argue..."
As soon as he finished speaking, Ren Bingda immediately heard the implication:
“Do you think the British may not pay attention to this issue?”
This guess was completely beyond the vast majority of people. anticipation.
"That's not it..."
The muscles on Zhang Zhenhua's face twitched a few times, obviously very surprised:
"Rolls-Royce is an old aviation company after all... there should be some bottom line when it comes to safety."
Several people around also expressed similar attitudes:
"I want to say It's just an oversight, but if we have pointed it out, it should be changed anyway..."
"Yeah, I think too..."
"..."< br>
But Ren Bingda, who had dealt with the British the most, shook his head and insisted on his opinion:
"No, you don't understand the British..."
In the end, everyone turned their attention to Chang Hao again. On Nan.
Faced with this question, the latter was a little difficult to answer for a while -
In fact, there was another reason why he made the above decision.
If the Trent 900 really has a problem because of this defect, it will be a good thing for China...
Due to the existence of that risk warning, the whole world will soon know that there is a company from China. Haofa Group has issued warnings long ago.
Comparing the two, it is simply free advertising.
You must know that for an industry giant like Luo Luo, the opportunity to make mistakes is not always available...
But this kind of words are definitely not suitable to be said in public.
Therefore, he organized his language and decided to end this topic with a classic joke:
"The British generally divide into four steps to deal with this problem."
"First The first stage is to claim that nothing happened;"
"The second stage is to say that something might have happened, but no action should be taken;"
"The third stage is to say that maybe something should happen, but no action should be taken. There is nothing we can do;”
"The fourth stage is to admit that maybe something could have been done, but now it is too late..."
(End of Chapter)