The wide-chord hollow fan blades, which were machined to produce two halves of symmetrical relatively flat blades before superplastic molding, are now placed in the middle of these two semi-symmetrical blades with a metal honeycomb core, and their shapes are slowly changing under high pressure and high temperature.

On the digital display screen, not only the pressure, temperature and other parameters are displayed, but also the time, of course, is also displayed, and the time passes minute by minute under the high temperature state of 920 degrees Celsius and under high pressure.

Throughout the scene, everyone looked at the process parameters seriously, and even, some people were slightly nervous in their hearts, praying in their hearts, God bless, we must succeed, and we must not fail.

Li Tianfeng is also looking at these parameters seriously, from Li Tianfeng's facial expression, he can't see anything, in fact, Li Tianfeng's heart is also a little nervous, if it succeeds, it means that Tianfeng Technology Company will master this advanced technology, if it fails, it will have to start all over again.

Zeng Qinghai said: "Boss, speaking from the heart, I am really a little nervous in my heart, worried about failure." ”

Li Tianfeng knew that he couldn't infect this tense atmosphere to everyone, so Li Tianfeng smiled slightly and said: "Mr. Zeng, it doesn't matter, we have prepared more blade blanks this time, if it doesn't work once, then carry out the second time, the third time, until it is successful." ”

Zeng Qinghai also smiled, looked at the time, and stopped talking, because the time is programmed to control zhì, after reaching the time required by the process, there is a "ding" sound, when the time comes, the mold is no longer heated, no longer high-pressure, but the pressure is gradually released, and the processed fan blades are naturally cooled with the furnace.

The temperature display gradually dropped from 920 degrees, and waiting for the temperature to drop was also a relatively long process, but everyone seemed to be more patient. After waiting for a long time, when the temperature drops to room temperature, the mold slowly opens, and this fan blade appears in front of everyone.

Many people were slightly excited in their hearts, and immediately took two steps forward, wanting to see the situation of this leaf. Li Tianfeng smiled, and Zeng Qinghai said loudly: "Everyone is not in a hurry, don't squeeze, Master Zhang, take out the leaves." ”

Wearing gloves, the worker Master Zhang took out the fan blade, which was still slightly warm, because the mold was coated with solder mask in advance, and under such high pressure and high temperature, the blade did not bond with the mold. I took it easily.

The blade is very large and wide, the width of an adult's palm, and the length is relatively long, but such a large blade is actually very light, and the worker master took it very easily.

The blades are titanium alloy and are still hollow. Of course it can't be bulky, on the contrary. It felt lighter, the blade was placed on a work table next to it, Li Tianfeng personally took the blade and looked at it, and everyone next to him, everyone surrounded Li Tianfeng and stretched their necks. Slightly excited and nervous, he looked at this freshly baked fan blade.

The final shape of the blade, especially the shape of the blade, is basically the same as the final design shape, but in order to obtain a more precise blade shape. This blade can only be regarded as a semi-finished product, and the blade body still has a little machining allowance, and the five-axis linkage high-speed and high-precision CNC grinding machine will grind the blade body again with high precision.

The blade shape of the fan blade is very important, which is not only related to the overall performance of the fan, but also to the aerodynamic performance of the fan part.

Undoubtedly, such a high-precision high-precision grinding of the blade body will obtain a very high precision fan blade, and whether it is Rolls-Royce or Pratt & Whitney, using superplastic molding and diffusion connection process, the final shape of the fan blade is directly pressed out by the mold just now, and the accuracy can certainly not be compared with the process of Tianfeng Technology Company.

Li Tianfeng took a closer look, and didn't see any obvious abnormalities, seeing that everyone was surrounding him, his neck stretched out, he couldn't help but smile, and said to Zeng Qinghai next to him: "Mr. Zeng, you should also take a good look." ”

Zeng Qinghai had been waiting for this sentence for a long time, and immediately took this leaf and looked at it carefully, and after reading it, he gave the blade to a group of technicians next to him, and suddenly, everyone immediately gathered around to look at it.

Zeng Qinghai said: "Boss, the processing seems to be good." ”

Li Tianfeng said: "It is very remarkable that we can process such a process for the first time, which shows that there is basically no major problem with our process parameters and process methods, but the final failure of the blade has to be known after strict inspection." ”

Zeng Qinghai nodded, after the blade completes the superplastic molding and diffusion connection process, the subsequent process is high-speed and high-precision grinding, grinding the blade body to achieve the final blade size, of course, the tenon leaf at the root of the blade will be finally finished.

After these processes are completed, the blade is basically finished product, and finally a layer of coating is sprayed on the blade body by plasma spraying.

The inspection of the blade is before the spraying process, after the completion of the grinding process, the processed blade, not only to measure the size, but also to carry out metallographic physical and chemical analysis, the blade is cut, and the welding part is checked, that is, the combination of the front and rear half of the blade, because the two half of the blade are coated with solder, welded together at high temperature and high pressure, and vacuum brazing.

The size inspection is qualified, and there is no problem with metallographic analysis, which means that there is only one step away from success, and finally, the blade should be tested for mechanical properties, fatigue testing, and a series of tests, which are qualified, and it is basically successful.

If there is a problem in any link during the period, it is necessary to analyze, find out the cause, and improve the parameters and process steps of the superplastic molding and diffusion joining process just now, and then process the blade after improvement, until the blade is fully qualified, and there is no problem.

There is still a lot of follow-up work, Li Tianfeng said: "Mr. Zeng, our fan blades are very important in the entire engine, you follow up the follow-up work personally, and report to me personally if there is any situation." ”

Zeng Qinghai said: "Boss, there is no problem. ”

Li Tianfeng returned to his office with satisfaction, just now, Li Tianfeng took it seriously, carefully looked at the situation of the blade, according to Li Tianfeng's view, there is basically no big problem, even if there is a little problem, it is just some small problems, combined with these small problems, improve the process parameters, and finally will be able to process a fully qualified wide chord hollow fan blade.

If this process is adopted, it can really process this kind of wide-chord hollow fan blades that are fully qualified and even of excellent quality, it will be of great significance, and if Tianfeng Technology Company develops the next turbofan engine in the future, there is no need to worry about this wide-chord hollow titanium alloy fan blades.

Li Tianfeng clearly remembers that when Rolls-Royce used the third-generation superplastic molding and diffusion connection process to process qualified wide-chord hollow fan blades, after the first engine was installed, Princess Carter of the British royal family also took a photo with the engine in person, and the photo was also posted on the front page of a famous British newspaper.

The fan blades that were processed just now still have to be precision grinding, as well as a series of inspections and tests, and the results will take a while to come out, Li Tianfeng knows that he can only wait patiently.

………

After a few days, the first batch of processed fan blades have been processed with high precision, and the blades have been processed very beautifully, Li Tianfeng even went to the blade processing center in person, and saw that the blades were as beautiful as he imagined, Li Tianfeng was very satisfied and very happy.

Even, Li Tianfeng also came to be interested, took a photo of the fan blades with his mobile phone, and used this beautiful fan blade as the wallpaper of his mobile phone, before, the wallpaper of Li Tianfeng's mobile phone has always been the turboshaft D engine, and now it has been replaced by this fan blade.

It can be seen how happy Li Tianfeng is, Zeng Qinghai is also very happy, full of sense of achievement, in addition, the size inspection of the blades is also very powerful, the size of these blades is all in line with the design size, none of them are out of tolerance.

The first batch of blades can be processed to such a quality, Li Tianfeng nodded in his heart, Zeng Qinghai's technological level is really good.

The dimensions are all measured and qualified, and high-precision grinding has been completed, the blades are almost finished products, as long as the final spraying process, spray a layer of coating, of course, these blades will never be sprayed, but extract one or two pieces for physical and chemical metallographic analysis, and the rest will carry out various related tests.

The titanium alloy wide-chord hollow fan blades are processed relatively smoothly, and the design work of this turbofan engine of Tianfeng Technology Company has also been carried out relatively smoothly, and yesterday, the turbine part also completed the first design review.

Fan, compressor, combustion chamber, turbine, the core and most important part of an engine, also known as the core of the aero engine (some do not include the combustion chamber), and the core of the turbofan engine of Tianfeng Technology Company is undoubtedly extremely high-tech.

A large number of new materials, new designs, new processes, the overall comprehensive performance is very good, take the turbine part that completed the preliminary design review yesterday.

The turbine disc is not only an advanced double-width plate design structure, but also a powder metallurgy superalloy, and the surface is sprayed with a thermal barrier coating, which can withstand higher temperatures; The turbine working blade is a third-generation single crystal blade, which is also a hollow blade, with an ultra-cold structure design and a thermal barrier coating on the surface.

The outer ring of the turbine is an advanced shingle structure, and it is also a high-temperature resistant ceramic matrix composite material, sealed with an advanced new generation of metal honeycomb sealing, and the static turbine guide vanes are also designed with ultra-cold structure and a thermal barrier coating on the surface.

The core machine part is very important, Li Tianfeng can be said to have put a lot of effort into it, and he does not dare to take it lightly, because Li Tianfeng knows that the core machine has a high technical content and is relatively advanced in design, and the second turbofan engine will be developed on this basis in the future, which will get twice the result with half the effort and be much easier.

…………

Today's two watches, the first one is sent!

I went out early this morning and came back late, and the update time was a little late, so I made everyone wait for a long time. (To be continued......)